| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library engine.resolver; |
| |
| import "dart:math" as math; |
| import 'dart:collection'; |
| |
| import 'package:analyzer/src/generated/utilities_collection.dart'; |
| |
| import 'ast.dart'; |
| import 'constant.dart'; |
| import 'element.dart'; |
| import 'element_resolver.dart'; |
| import 'engine.dart'; |
| import 'error.dart'; |
| import 'error_verifier.dart'; |
| import 'html.dart' as ht; |
| import 'java_core.dart'; |
| import 'java_engine.dart'; |
| import 'scanner.dart' as sc; |
| import 'sdk.dart' show DartSdk, SdkLibrary; |
| import 'source.dart'; |
| import 'static_type_analyzer.dart'; |
| import 'utilities_dart.dart'; |
| import 'utilities_general.dart'; |
| |
| /** |
| * Callback signature used by ImplicitConstructorBuilder to register |
| * computations to be performed, and their dependencies. A call to this |
| * callback indicates that [computation] may be used to compute implicit |
| * constructors for [classElement], but that the computation may not be invoked |
| * until after implicit constructors have been built for [superclassElement]. |
| */ |
| typedef void ImplicitConstructorBuilderCallback(ClassElement classElement, |
| ClassElement superclassElement, void computation()); |
| |
| typedef void VoidFunction(); |
| |
| /** |
| * Instances of the class `BestPracticesVerifier` traverse an AST structure looking for |
| * violations of Dart best practices. |
| */ |
| class BestPracticesVerifier extends RecursiveAstVisitor<Object> { |
| // static String _HASHCODE_GETTER_NAME = "hashCode"; |
| |
| static String _NULL_TYPE_NAME = "Null"; |
| |
| static String _TO_INT_METHOD_NAME = "toInt"; |
| |
| /** |
| * The class containing the AST nodes being visited, or `null` if we are not in the scope of |
| * a class. |
| */ |
| ClassElement _enclosingClass; |
| |
| /** |
| * The error reporter by which errors will be reported. |
| */ |
| final ErrorReporter _errorReporter; |
| |
| /** |
| * Create a new instance of the [BestPracticesVerifier]. |
| * |
| * @param errorReporter the error reporter |
| */ |
| BestPracticesVerifier(this._errorReporter); |
| |
| @override |
| Object visitArgumentList(ArgumentList node) { |
| _checkForArgumentTypesNotAssignableInList(node); |
| return super.visitArgumentList(node); |
| } |
| |
| @override |
| Object visitAsExpression(AsExpression node) { |
| _checkForUnnecessaryCast(node); |
| return super.visitAsExpression(node); |
| } |
| |
| @override |
| Object visitAssignmentExpression(AssignmentExpression node) { |
| sc.TokenType operatorType = node.operator.type; |
| if (operatorType == sc.TokenType.EQ) { |
| _checkForUseOfVoidResult(node.rightHandSide); |
| _checkForInvalidAssignment(node.leftHandSide, node.rightHandSide); |
| } else { |
| _checkForDeprecatedMemberUse(node.bestElement, node); |
| } |
| return super.visitAssignmentExpression(node); |
| } |
| |
| @override |
| Object visitBinaryExpression(BinaryExpression node) { |
| _checkForDivisionOptimizationHint(node); |
| _checkForDeprecatedMemberUse(node.bestElement, node); |
| return super.visitBinaryExpression(node); |
| } |
| |
| @override |
| Object visitClassDeclaration(ClassDeclaration node) { |
| ClassElement outerClass = _enclosingClass; |
| try { |
| _enclosingClass = node.element; |
| // Commented out until we decide that we want this hint in the analyzer |
| // checkForOverrideEqualsButNotHashCode(node); |
| return super.visitClassDeclaration(node); |
| } finally { |
| _enclosingClass = outerClass; |
| } |
| } |
| |
| @override |
| Object visitExportDirective(ExportDirective node) { |
| _checkForDeprecatedMemberUse(node.uriElement, node); |
| return super.visitExportDirective(node); |
| } |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) { |
| _checkForMissingReturn(node.returnType, node.functionExpression.body); |
| return super.visitFunctionDeclaration(node); |
| } |
| |
| @override |
| Object visitImportDirective(ImportDirective node) { |
| _checkForDeprecatedMemberUse(node.uriElement, node); |
| ImportElement importElement = node.element; |
| if (importElement != null) { |
| if (importElement.isDeferred) { |
| _checkForLoadLibraryFunction(node, importElement); |
| } |
| } |
| return super.visitImportDirective(node); |
| } |
| |
| @override |
| Object visitIndexExpression(IndexExpression node) { |
| _checkForDeprecatedMemberUse(node.bestElement, node); |
| return super.visitIndexExpression(node); |
| } |
| |
| @override |
| Object visitInstanceCreationExpression(InstanceCreationExpression node) { |
| _checkForDeprecatedMemberUse(node.staticElement, node); |
| return super.visitInstanceCreationExpression(node); |
| } |
| |
| @override |
| Object visitIsExpression(IsExpression node) { |
| _checkAllTypeChecks(node); |
| return super.visitIsExpression(node); |
| } |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| // This was determined to not be a good hint, see: dartbug.com/16029 |
| //checkForOverridingPrivateMember(node); |
| _checkForMissingReturn(node.returnType, node.body); |
| return super.visitMethodDeclaration(node); |
| } |
| |
| @override |
| Object visitPostfixExpression(PostfixExpression node) { |
| _checkForDeprecatedMemberUse(node.bestElement, node); |
| return super.visitPostfixExpression(node); |
| } |
| |
| @override |
| Object visitPrefixExpression(PrefixExpression node) { |
| _checkForDeprecatedMemberUse(node.bestElement, node); |
| return super.visitPrefixExpression(node); |
| } |
| |
| @override |
| Object |
| visitRedirectingConstructorInvocation(RedirectingConstructorInvocation node) { |
| _checkForDeprecatedMemberUse(node.staticElement, node); |
| return super.visitRedirectingConstructorInvocation(node); |
| } |
| |
| @override |
| Object visitSimpleIdentifier(SimpleIdentifier node) { |
| _checkForDeprecatedMemberUseAtIdentifier(node); |
| return super.visitSimpleIdentifier(node); |
| } |
| |
| @override |
| Object visitSuperConstructorInvocation(SuperConstructorInvocation node) { |
| _checkForDeprecatedMemberUse(node.staticElement, node); |
| return super.visitSuperConstructorInvocation(node); |
| } |
| |
| @override |
| Object visitVariableDeclaration(VariableDeclaration node) { |
| _checkForUseOfVoidResult(node.initializer); |
| _checkForInvalidAssignment(node.name, node.initializer); |
| return super.visitVariableDeclaration(node); |
| } |
| |
| /** |
| * Check for the passed is expression for the unnecessary type check hint codes as well as null |
| * checks expressed using an is expression. |
| * |
| * @param node the is expression to check |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.TYPE_CHECK_IS_NOT_NULL], [HintCode.TYPE_CHECK_IS_NULL], |
| * [HintCode.UNNECESSARY_TYPE_CHECK_TRUE], and |
| * [HintCode.UNNECESSARY_TYPE_CHECK_FALSE]. |
| */ |
| bool _checkAllTypeChecks(IsExpression node) { |
| Expression expression = node.expression; |
| TypeName typeName = node.type; |
| DartType lhsType = expression.staticType; |
| DartType rhsType = typeName.type; |
| if (lhsType == null || rhsType == null) { |
| return false; |
| } |
| String rhsNameStr = typeName.name.name; |
| // if x is dynamic |
| if (rhsType.isDynamic && rhsNameStr == sc.Keyword.DYNAMIC.syntax) { |
| if (node.notOperator == null) { |
| // the is case |
| _errorReporter.reportErrorForNode( |
| HintCode.UNNECESSARY_TYPE_CHECK_TRUE, |
| node); |
| } else { |
| // the is not case |
| _errorReporter.reportErrorForNode( |
| HintCode.UNNECESSARY_TYPE_CHECK_FALSE, |
| node); |
| } |
| return true; |
| } |
| Element rhsElement = rhsType.element; |
| LibraryElement libraryElement = |
| rhsElement != null ? rhsElement.library : null; |
| if (libraryElement != null && libraryElement.isDartCore) { |
| // if x is Object or null is Null |
| if (rhsType.isObject || |
| (expression is NullLiteral && rhsNameStr == _NULL_TYPE_NAME)) { |
| if (node.notOperator == null) { |
| // the is case |
| _errorReporter.reportErrorForNode( |
| HintCode.UNNECESSARY_TYPE_CHECK_TRUE, |
| node); |
| } else { |
| // the is not case |
| _errorReporter.reportErrorForNode( |
| HintCode.UNNECESSARY_TYPE_CHECK_FALSE, |
| node); |
| } |
| return true; |
| } else if (rhsNameStr == _NULL_TYPE_NAME) { |
| if (node.notOperator == null) { |
| // the is case |
| _errorReporter.reportErrorForNode(HintCode.TYPE_CHECK_IS_NULL, node); |
| } else { |
| // the is not case |
| _errorReporter.reportErrorForNode( |
| HintCode.TYPE_CHECK_IS_NOT_NULL, |
| node); |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * This verifies that the passed expression can be assigned to its corresponding parameters. |
| * |
| * This method corresponds to ErrorVerifier.checkForArgumentTypeNotAssignable. |
| * |
| * TODO (jwren) In the ErrorVerifier there are other warnings that we could have a corresponding |
| * hint for: see other callers of ErrorVerifier.checkForArgumentTypeNotAssignable(..). |
| * |
| * @param expression the expression to evaluate |
| * @param expectedStaticType the expected static type of the parameter |
| * @param actualStaticType the actual static type of the argument |
| * @param expectedPropagatedType the expected propagated type of the parameter, may be |
| * `null` |
| * @param actualPropagatedType the expected propagated type of the parameter, may be `null` |
| * @return `true` if and only if an hint code is generated on the passed node |
| * See [HintCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]. |
| */ |
| bool _checkForArgumentTypeNotAssignable(Expression expression, |
| DartType expectedStaticType, DartType actualStaticType, |
| DartType expectedPropagatedType, DartType actualPropagatedType, |
| ErrorCode hintCode) { |
| // |
| // Warning case: test static type information |
| // |
| if (actualStaticType != null && expectedStaticType != null) { |
| if (!actualStaticType.isAssignableTo(expectedStaticType)) { |
| // A warning was created in the ErrorVerifier, return false, don't |
| // create a hint when a warning has already been created. |
| return false; |
| } |
| } |
| // |
| // Hint case: test propagated type information |
| // |
| // Compute the best types to use. |
| DartType expectedBestType = |
| expectedPropagatedType != null ? expectedPropagatedType : expectedStaticType; |
| DartType actualBestType = |
| actualPropagatedType != null ? actualPropagatedType : actualStaticType; |
| if (actualBestType != null && expectedBestType != null) { |
| if (!actualBestType.isAssignableTo(expectedBestType)) { |
| _errorReporter.reportTypeErrorForNode( |
| hintCode, |
| expression, |
| [actualBestType, expectedBestType]); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * This verifies that the passed argument can be assigned to its corresponding parameter. |
| * |
| * This method corresponds to ErrorCode.checkForArgumentTypeNotAssignableForArgument. |
| * |
| * @param argument the argument to evaluate |
| * @return `true` if and only if an hint code is generated on the passed node |
| * See [HintCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]. |
| */ |
| bool _checkForArgumentTypeNotAssignableForArgument(Expression argument) { |
| if (argument == null) { |
| return false; |
| } |
| ParameterElement staticParameterElement = argument.staticParameterElement; |
| DartType staticParameterType = |
| staticParameterElement == null ? null : staticParameterElement.type; |
| ParameterElement propagatedParameterElement = |
| argument.propagatedParameterElement; |
| DartType propagatedParameterType = |
| propagatedParameterElement == null ? null : propagatedParameterElement.type; |
| return _checkForArgumentTypeNotAssignableWithExpectedTypes( |
| argument, |
| staticParameterType, |
| propagatedParameterType, |
| HintCode.ARGUMENT_TYPE_NOT_ASSIGNABLE); |
| } |
| |
| /** |
| * This verifies that the passed expression can be assigned to its corresponding parameters. |
| * |
| * This method corresponds to ErrorCode.checkForArgumentTypeNotAssignableWithExpectedTypes. |
| * |
| * @param expression the expression to evaluate |
| * @param expectedStaticType the expected static type |
| * @param expectedPropagatedType the expected propagated type, may be `null` |
| * @return `true` if and only if an hint code is generated on the passed node |
| * See [HintCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]. |
| */ |
| bool |
| _checkForArgumentTypeNotAssignableWithExpectedTypes(Expression expression, |
| DartType expectedStaticType, DartType expectedPropagatedType, |
| ErrorCode errorCode) => |
| _checkForArgumentTypeNotAssignable( |
| expression, |
| expectedStaticType, |
| expression.staticType, |
| expectedPropagatedType, |
| expression.propagatedType, |
| errorCode); |
| |
| /** |
| * This verifies that the passed arguments can be assigned to their corresponding parameters. |
| * |
| * This method corresponds to ErrorCode.checkForArgumentTypesNotAssignableInList. |
| * |
| * @param node the arguments to evaluate |
| * @return `true` if and only if an hint code is generated on the passed node |
| * See [HintCode.ARGUMENT_TYPE_NOT_ASSIGNABLE]. |
| */ |
| bool _checkForArgumentTypesNotAssignableInList(ArgumentList argumentList) { |
| if (argumentList == null) { |
| return false; |
| } |
| bool problemReported = false; |
| for (Expression argument in argumentList.arguments) { |
| if (_checkForArgumentTypeNotAssignableForArgument(argument)) { |
| problemReported = true; |
| } |
| } |
| return problemReported; |
| } |
| |
| /** |
| * Given some [Element], look at the associated metadata and report the use of the member if |
| * it is declared as deprecated. |
| * |
| * @param element some element to check for deprecated use of |
| * @param node the node use for the location of the error |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.DEPRECATED_MEMBER_USE]. |
| */ |
| bool _checkForDeprecatedMemberUse(Element element, AstNode node) { |
| if (element != null && element.isDeprecated) { |
| String displayName = element.displayName; |
| if (element is ConstructorElement) { |
| // TODO(jwren) We should modify ConstructorElement.getDisplayName(), |
| // or have the logic centralized elsewhere, instead of doing this logic |
| // here. |
| ConstructorElement constructorElement = element; |
| displayName = constructorElement.enclosingElement.displayName; |
| if (!constructorElement.displayName.isEmpty) { |
| displayName = "$displayName.${constructorElement.displayName}"; |
| } |
| } |
| _errorReporter.reportErrorForNode( |
| HintCode.DEPRECATED_MEMBER_USE, |
| node, |
| [displayName]); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * For [SimpleIdentifier]s, only call [checkForDeprecatedMemberUse] |
| * if the node is not in a declaration context. |
| * |
| * Also, if the identifier is a constructor name in a constructor invocation, then calls to the |
| * deprecated constructor will be caught by |
| * [visitInstanceCreationExpression] and |
| * [visitSuperConstructorInvocation], and can be ignored by |
| * this visit method. |
| * |
| * @param identifier some simple identifier to check for deprecated use of |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.DEPRECATED_MEMBER_USE]. |
| */ |
| bool _checkForDeprecatedMemberUseAtIdentifier(SimpleIdentifier identifier) { |
| if (identifier.inDeclarationContext()) { |
| return false; |
| } |
| AstNode parent = identifier.parent; |
| if ((parent is ConstructorName && identical(identifier, parent.name)) || |
| (parent is SuperConstructorInvocation && |
| identical(identifier, parent.constructorName)) || |
| parent is HideCombinator) { |
| return false; |
| } |
| return _checkForDeprecatedMemberUse(identifier.bestElement, identifier); |
| } |
| |
| /** |
| * Check for the passed binary expression for the [HintCode.DIVISION_OPTIMIZATION]. |
| * |
| * @param node the binary expression to check |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.DIVISION_OPTIMIZATION]. |
| */ |
| bool _checkForDivisionOptimizationHint(BinaryExpression node) { |
| // Return if the operator is not '/' |
| if (node.operator.type != sc.TokenType.SLASH) { |
| return false; |
| } |
| // Return if the '/' operator is not defined in core, or if we don't know |
| // its static or propagated type |
| MethodElement methodElement = node.bestElement; |
| if (methodElement == null) { |
| return false; |
| } |
| LibraryElement libraryElement = methodElement.library; |
| if (libraryElement != null && !libraryElement.isDartCore) { |
| return false; |
| } |
| // Report error if the (x/y) has toInt() invoked on it |
| if (node.parent is ParenthesizedExpression) { |
| ParenthesizedExpression parenthesizedExpression = |
| _wrapParenthesizedExpression(node.parent as ParenthesizedExpression); |
| if (parenthesizedExpression.parent is MethodInvocation) { |
| MethodInvocation methodInvocation = |
| parenthesizedExpression.parent as MethodInvocation; |
| if (_TO_INT_METHOD_NAME == methodInvocation.methodName.name && |
| methodInvocation.argumentList.arguments.isEmpty) { |
| _errorReporter.reportErrorForNode( |
| HintCode.DIVISION_OPTIMIZATION, |
| methodInvocation); |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * This verifies that the passed left hand side and right hand side represent a valid assignment. |
| * |
| * This method corresponds to ErrorVerifier.checkForInvalidAssignment. |
| * |
| * @param lhs the left hand side expression |
| * @param rhs the right hand side expression |
| * @return `true` if and only if an error code is generated on the passed node |
| * See [HintCode.INVALID_ASSIGNMENT]. |
| */ |
| bool _checkForInvalidAssignment(Expression lhs, Expression rhs) { |
| if (lhs == null || rhs == null) { |
| return false; |
| } |
| VariableElement leftVariableElement = ErrorVerifier.getVariableElement(lhs); |
| DartType leftType = (leftVariableElement == null) ? |
| ErrorVerifier.getStaticType(lhs) : |
| leftVariableElement.type; |
| DartType staticRightType = ErrorVerifier.getStaticType(rhs); |
| if (!staticRightType.isAssignableTo(leftType)) { |
| // The warning was generated on this rhs |
| return false; |
| } |
| // Test for, and then generate the hint |
| DartType bestRightType = rhs.bestType; |
| if (leftType != null && bestRightType != null) { |
| if (!bestRightType.isAssignableTo(leftType)) { |
| _errorReporter.reportTypeErrorForNode( |
| HintCode.INVALID_ASSIGNMENT, |
| rhs, |
| [bestRightType, leftType]); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Check that the imported library does not define a loadLibrary function. The import has already |
| * been determined to be deferred when this is called. |
| * |
| * @param node the import directive to evaluate |
| * @param importElement the [ImportElement] retrieved from the node |
| * @return `true` if and only if an error code is generated on the passed node |
| * See [CompileTimeErrorCode.IMPORT_DEFERRED_LIBRARY_WITH_LOAD_FUNCTION]. |
| */ |
| bool _checkForLoadLibraryFunction(ImportDirective node, |
| ImportElement importElement) { |
| LibraryElement importedLibrary = importElement.importedLibrary; |
| if (importedLibrary == null) { |
| return false; |
| } |
| if (importedLibrary.hasLoadLibraryFunction) { |
| _errorReporter.reportErrorForNode( |
| HintCode.IMPORT_DEFERRED_LIBRARY_WITH_LOAD_FUNCTION, |
| node, |
| [importedLibrary.name]); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Generate a hint for functions or methods that have a return type, but do not have a return |
| * statement on all branches. At the end of blocks with no return, Dart implicitly returns |
| * `null`, avoiding these implicit returns is considered a best practice. |
| * |
| * @param node the binary expression to check |
| * @param body the function body |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.MISSING_RETURN]. |
| */ |
| bool _checkForMissingReturn(TypeName returnType, FunctionBody body) { |
| // Check that the method or function has a return type, and a function body |
| if (returnType == null || body == null) { |
| return false; |
| } |
| // Check that the body is a BlockFunctionBody |
| if (body is! BlockFunctionBody) { |
| return false; |
| } |
| // Check that the type is resolvable, and is not "void" |
| DartType returnTypeType = returnType.type; |
| if (returnTypeType == null || returnTypeType.isVoid) { |
| return false; |
| } |
| // Check the block for a return statement, if not, create the hint |
| BlockFunctionBody blockFunctionBody = body as BlockFunctionBody; |
| if (!blockFunctionBody.accept(new ExitDetector())) { |
| _errorReporter.reportErrorForNode( |
| HintCode.MISSING_RETURN, |
| returnType, |
| [returnTypeType.displayName]); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Check for the passed class declaration for the |
| * [HintCode.OVERRIDE_EQUALS_BUT_NOT_HASH_CODE] hint code. |
| * |
| * @param node the class declaration to check |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.OVERRIDE_EQUALS_BUT_NOT_HASH_CODE]. |
| */ |
| // bool _checkForOverrideEqualsButNotHashCode(ClassDeclaration node) { |
| // ClassElement classElement = node.element; |
| // if (classElement == null) { |
| // return false; |
| // } |
| // MethodElement equalsOperatorMethodElement = |
| // classElement.getMethod(sc.TokenType.EQ_EQ.lexeme); |
| // if (equalsOperatorMethodElement != null) { |
| // PropertyAccessorElement hashCodeElement = |
| // classElement.getGetter(_HASHCODE_GETTER_NAME); |
| // if (hashCodeElement == null) { |
| // _errorReporter.reportErrorForNode( |
| // HintCode.OVERRIDE_EQUALS_BUT_NOT_HASH_CODE, |
| // node.name, |
| // [classElement.displayName]); |
| // return true; |
| // } |
| // } |
| // return false; |
| // } |
| |
| /** |
| * Check for the passed as expression for the [HintCode.UNNECESSARY_CAST] hint code. |
| * |
| * @param node the as expression to check |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.UNNECESSARY_CAST]. |
| */ |
| bool _checkForUnnecessaryCast(AsExpression node) { |
| // TODO(jwren) After dartbug.com/13732, revisit this, we should be able to |
| // remove the (x is! TypeParameterType) checks. |
| AstNode parent = node.parent; |
| if (parent is ConditionalExpression && |
| (node == parent.thenExpression || node == parent.elseExpression)) { |
| Expression thenExpression = parent.thenExpression; |
| DartType thenType; |
| if (thenExpression is AsExpression) { |
| thenType = thenExpression.expression.staticType; |
| } else { |
| thenType = thenExpression.staticType; |
| } |
| Expression elseExpression = parent.elseExpression; |
| DartType elseType; |
| if (elseExpression is AsExpression) { |
| elseType = elseExpression.expression.staticType; |
| } else { |
| elseType = elseExpression.staticType; |
| } |
| if (thenType != null && |
| elseType != null && |
| !thenType.isDynamic && |
| !elseType.isDynamic && |
| !thenType.isMoreSpecificThan(elseType) && |
| !elseType.isMoreSpecificThan(thenType)) { |
| return false; |
| } |
| } |
| DartType lhsType = node.expression.staticType; |
| DartType rhsType = node.type.type; |
| if (lhsType != null && |
| rhsType != null && |
| !lhsType.isDynamic && |
| !rhsType.isDynamic && |
| lhsType.isMoreSpecificThan(rhsType)) { |
| _errorReporter.reportErrorForNode(HintCode.UNNECESSARY_CAST, node); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Check for situations where the result of a method or function is used, when it returns 'void'. |
| * |
| * TODO(jwren) Many other situations of use could be covered. We currently cover the cases var x = |
| * m() and x = m(), but we could also cover cases such as m().x, m()[k], a + m(), f(m()), return |
| * m(). |
| * |
| * @param node expression on the RHS of some assignment |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.USE_OF_VOID_RESULT]. |
| */ |
| bool _checkForUseOfVoidResult(Expression expression) { |
| if (expression == null || expression is! MethodInvocation) { |
| return false; |
| } |
| MethodInvocation methodInvocation = expression as MethodInvocation; |
| if (identical(methodInvocation.staticType, VoidTypeImpl.instance)) { |
| SimpleIdentifier methodName = methodInvocation.methodName; |
| _errorReporter.reportErrorForNode( |
| HintCode.USE_OF_VOID_RESULT, |
| methodName, |
| [methodName.name]); |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Given a parenthesized expression, this returns the parent (or recursively grand-parent) of the |
| * expression that is a parenthesized expression, but whose parent is not a parenthesized |
| * expression. |
| * |
| * For example given the code `(((e)))`: `(e) -> (((e)))`. |
| * |
| * @param parenthesizedExpression some expression whose parent is a parenthesized expression |
| * @return the first parent or grand-parent that is a parenthesized expression, that does not have |
| * a parenthesized expression parent |
| */ |
| static ParenthesizedExpression |
| _wrapParenthesizedExpression(ParenthesizedExpression parenthesizedExpression) { |
| if (parenthesizedExpression.parent is ParenthesizedExpression) { |
| return _wrapParenthesizedExpression( |
| parenthesizedExpression.parent as ParenthesizedExpression); |
| } |
| return parenthesizedExpression; |
| } |
| } |
| |
| /** |
| * Instances of the class `ClassScope` implement the scope defined by a class. |
| */ |
| class ClassScope extends EnclosedScope { |
| /** |
| * Initialize a newly created scope enclosed within another scope. |
| * |
| * @param enclosingScope the scope in which this scope is lexically enclosed |
| * @param typeElement the element representing the type represented by this scope |
| */ |
| ClassScope(Scope enclosingScope, ClassElement typeElement) |
| : super(enclosingScope) { |
| if (typeElement == null) { |
| throw new IllegalArgumentException("class element cannot be null"); |
| } |
| _defineMembers(typeElement); |
| } |
| |
| @override |
| AnalysisError getErrorForDuplicate(Element existing, Element duplicate) { |
| if (existing is PropertyAccessorElement && duplicate is MethodElement) { |
| if (existing.nameOffset < duplicate.nameOffset) { |
| return new AnalysisError.con2( |
| duplicate.source, |
| duplicate.nameOffset, |
| duplicate.displayName.length, |
| CompileTimeErrorCode.METHOD_AND_GETTER_WITH_SAME_NAME, |
| [existing.displayName]); |
| } else { |
| return new AnalysisError.con2( |
| existing.source, |
| existing.nameOffset, |
| existing.displayName.length, |
| CompileTimeErrorCode.GETTER_AND_METHOD_WITH_SAME_NAME, |
| [existing.displayName]); |
| } |
| } |
| return super.getErrorForDuplicate(existing, duplicate); |
| } |
| |
| /** |
| * Define the instance members defined by the class. |
| * |
| * @param typeElement the element representing the type represented by this scope |
| */ |
| void _defineMembers(ClassElement typeElement) { |
| for (PropertyAccessorElement accessor in typeElement.accessors) { |
| define(accessor); |
| } |
| for (MethodElement method in typeElement.methods) { |
| define(method); |
| } |
| } |
| } |
| |
| /** |
| * A `CompilationUnitBuilder` builds an element model for a single compilation |
| * unit. |
| */ |
| class CompilationUnitBuilder { |
| /** |
| * Build the compilation unit element for the given [source] based on the |
| * compilation [unit] associated with the source. Throw an AnalysisException |
| * if the element could not be built. |
| */ |
| CompilationUnitElementImpl buildCompilationUnit(Source source, |
| CompilationUnit unit) { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| if (unit == null) { |
| return null; |
| } |
| ElementHolder holder = new ElementHolder(); |
| ElementBuilder builder = new ElementBuilder(holder); |
| unit.accept(builder); |
| CompilationUnitElementImpl element = |
| new CompilationUnitElementImpl(source.shortName); |
| element.accessors = holder.accessors; |
| element.enums = holder.enums; |
| element.functions = holder.functions; |
| element.source = source; |
| element.typeAliases = holder.typeAliases; |
| element.types = holder.types; |
| element.topLevelVariables = holder.topLevelVariables; |
| unit.element = element; |
| holder.validate(); |
| return element; |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `ConstantVerifier` traverse an AST structure looking for additional |
| * errors and warnings not covered by the parser and resolver. In particular, it looks for errors |
| * and warnings related to constant expressions. |
| */ |
| class ConstantVerifier extends RecursiveAstVisitor<Object> { |
| /** |
| * The error reporter by which errors will be reported. |
| */ |
| final ErrorReporter _errorReporter; |
| |
| /** |
| * The type provider used to access the known types. |
| */ |
| final TypeProvider _typeProvider; |
| |
| /** |
| * The type representing the type 'bool'. |
| */ |
| InterfaceType _boolType; |
| |
| /** |
| * The type representing the type 'int'. |
| */ |
| InterfaceType _intType; |
| |
| /** |
| * The type representing the type 'num'. |
| */ |
| InterfaceType _numType; |
| |
| /** |
| * The type representing the type 'string'. |
| */ |
| InterfaceType _stringType; |
| |
| /** |
| * The current library that is being analyzed. |
| */ |
| final LibraryElement _currentLibrary; |
| |
| /** |
| * Initialize a newly created constant verifier. |
| * |
| * @param errorReporter the error reporter by which errors will be reported |
| */ |
| ConstantVerifier(this._errorReporter, this._currentLibrary, |
| this._typeProvider) { |
| this._boolType = _typeProvider.boolType; |
| this._intType = _typeProvider.intType; |
| this._numType = _typeProvider.numType; |
| this._stringType = _typeProvider.stringType; |
| } |
| |
| @override |
| Object visitAnnotation(Annotation node) { |
| super.visitAnnotation(node); |
| // check annotation creation |
| Element element = node.element; |
| if (element is ConstructorElement) { |
| ConstructorElement constructorElement = element; |
| // should 'const' constructor |
| if (!constructorElement.isConst) { |
| _errorReporter.reportErrorForNode( |
| CompileTimeErrorCode.NON_CONSTANT_ANNOTATION_CONSTRUCTOR, |
| node); |
| return null; |
| } |
| // should have arguments |
| ArgumentList argumentList = node.arguments; |
| if (argumentList == null) { |
| _errorReporter.reportErrorForNode( |
| CompileTimeErrorCode.NO_ANNOTATION_CONSTRUCTOR_ARGUMENTS, |
| node); |
| return null; |
| } |
| // arguments should be constants |
| _validateConstantArguments(argumentList); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| if (node.constKeyword != null) { |
| _validateConstructorInitializers(node); |
| _validateFieldInitializers(node.parent as ClassDeclaration, node); |
| } |
| _validateDefaultValues(node.parameters); |
| return super.visitConstructorDeclaration(node); |
| } |
| |
| @override |
| Object visitFunctionExpression(FunctionExpression node) { |
| super.visitFunctionExpression(node); |
| _validateDefaultValues(node.parameters); |
| return null; |
| } |
| |
| @override |
| Object visitInstanceCreationExpression(InstanceCreationExpression node) { |
| if (node.isConst) { |
| EvaluationResultImpl evaluationResult = node.evaluationResult; |
| // Note: evaluationResult might be null if there are circular references |
| // among constants. |
| if (evaluationResult != null) { |
| _reportErrors(evaluationResult.errors, null); |
| } |
| } |
| _validateInstanceCreationArguments(node); |
| return super.visitInstanceCreationExpression(node); |
| } |
| |
| @override |
| Object visitListLiteral(ListLiteral node) { |
| super.visitListLiteral(node); |
| if (node.constKeyword != null) { |
| DartObjectImpl result; |
| for (Expression element in node.elements) { |
| result = |
| _validate(element, CompileTimeErrorCode.NON_CONSTANT_LIST_ELEMENT); |
| if (result != null) { |
| _reportErrorIfFromDeferredLibrary( |
| element, |
| CompileTimeErrorCode.NON_CONSTANT_LIST_ELEMENT_FROM_DEFERRED_LIBRARY); |
| } |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitMapLiteral(MapLiteral node) { |
| super.visitMapLiteral(node); |
| bool isConst = node.constKeyword != null; |
| bool reportEqualKeys = true; |
| HashSet<DartObject> keys = new HashSet<DartObject>(); |
| List<Expression> invalidKeys = new List<Expression>(); |
| for (MapLiteralEntry entry in node.entries) { |
| Expression key = entry.key; |
| if (isConst) { |
| DartObjectImpl keyResult = |
| _validate(key, CompileTimeErrorCode.NON_CONSTANT_MAP_KEY); |
| Expression valueExpression = entry.value; |
| DartObjectImpl valueResult = |
| _validate(valueExpression, CompileTimeErrorCode.NON_CONSTANT_MAP_VALUE); |
| if (valueResult != null) { |
| _reportErrorIfFromDeferredLibrary( |
| valueExpression, |
| CompileTimeErrorCode.NON_CONSTANT_MAP_VALUE_FROM_DEFERRED_LIBRARY); |
| } |
| if (keyResult != null) { |
| _reportErrorIfFromDeferredLibrary( |
| key, |
| CompileTimeErrorCode.NON_CONSTANT_MAP_KEY_FROM_DEFERRED_LIBRARY); |
| if (keys.contains(keyResult)) { |
| invalidKeys.add(key); |
| } else { |
| keys.add(keyResult); |
| } |
| DartType type = keyResult.type; |
| if (_implementsEqualsWhenNotAllowed(type)) { |
| _errorReporter.reportErrorForNode( |
| CompileTimeErrorCode.CONST_MAP_KEY_EXPRESSION_TYPE_IMPLEMENTS_EQUALS, |
| key, |
| [type.displayName]); |
| } |
| } |
| } else { |
| // Note: we throw the errors away because this isn't actually a const. |
| AnalysisErrorListener errorListener = |
| AnalysisErrorListener.NULL_LISTENER; |
| ErrorReporter subErrorReporter = |
| new ErrorReporter(errorListener, _errorReporter.source); |
| DartObjectImpl result = |
| key.accept(new ConstantVisitor.con1(_typeProvider, subErrorReporter)); |
| if (result != null) { |
| if (keys.contains(result)) { |
| invalidKeys.add(key); |
| } else { |
| keys.add(result); |
| } |
| } else { |
| reportEqualKeys = false; |
| } |
| } |
| } |
| if (reportEqualKeys) { |
| for (Expression key in invalidKeys) { |
| _errorReporter.reportErrorForNode( |
| StaticWarningCode.EQUAL_KEYS_IN_MAP, |
| key); |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| super.visitMethodDeclaration(node); |
| _validateDefaultValues(node.parameters); |
| return null; |
| } |
| |
| @override |
| Object visitSwitchStatement(SwitchStatement node) { |
| // TODO(paulberry): to minimize error messages, it would be nice to |
| // compare all types with the most popular type rather than the first |
| // type. |
| NodeList<SwitchMember> switchMembers = node.members; |
| bool foundError = false; |
| DartType firstType = null; |
| for (SwitchMember switchMember in switchMembers) { |
| if (switchMember is SwitchCase) { |
| SwitchCase switchCase = switchMember; |
| Expression expression = switchCase.expression; |
| DartObjectImpl caseResult = |
| _validate(expression, CompileTimeErrorCode.NON_CONSTANT_CASE_EXPRESSION); |
| if (caseResult != null) { |
| _reportErrorIfFromDeferredLibrary( |
| expression, |
| CompileTimeErrorCode.NON_CONSTANT_CASE_EXPRESSION_FROM_DEFERRED_LIBRARY); |
| DartObject value = caseResult; |
| if (firstType == null) { |
| firstType = value.type; |
| } else { |
| DartType nType = value.type; |
| if (firstType != nType) { |
| _errorReporter.reportErrorForNode( |
| CompileTimeErrorCode.INCONSISTENT_CASE_EXPRESSION_TYPES, |
| expression, |
| [expression.toSource(), firstType.displayName]); |
| foundError = true; |
| } |
| } |
| } |
| } |
| } |
| if (!foundError) { |
| _checkForCaseExpressionTypeImplementsEquals(node, firstType); |
| } |
| return super.visitSwitchStatement(node); |
| } |
| |
| @override |
| Object visitVariableDeclaration(VariableDeclaration node) { |
| super.visitVariableDeclaration(node); |
| Expression initializer = node.initializer; |
| if (initializer != null && node.isConst) { |
| VariableElementImpl element = node.element as VariableElementImpl; |
| EvaluationResultImpl result = element.evaluationResult; |
| if (result == null) { |
| // |
| // Normally we don't need to visit const variable declarations because |
| // we have already computed their values. But if we missed it for some |
| // reason, this gives us a second chance. |
| // |
| result = new EvaluationResultImpl.con1( |
| _validate( |
| initializer, |
| CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE)); |
| element.evaluationResult = result; |
| return null; |
| } |
| _reportErrors( |
| result.errors, |
| CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE); |
| _reportErrorIfFromDeferredLibrary( |
| initializer, |
| CompileTimeErrorCode.CONST_INITIALIZED_WITH_NON_CONSTANT_VALUE_FROM_DEFERRED_LIBRARY); |
| } |
| return null; |
| } |
| |
| /** |
| * This verifies that the passed switch statement does not have a case expression with the |
| * operator '==' overridden. |
| * |
| * @param node the switch statement to evaluate |
| * @param type the common type of all 'case' expressions |
| * @return `true` if and only if an error code is generated on the passed node |
| * See [CompileTimeErrorCode.CASE_EXPRESSION_TYPE_IMPLEMENTS_EQUALS]. |
| */ |
| bool _checkForCaseExpressionTypeImplementsEquals(SwitchStatement node, |
| DartType type) { |
| if (!_implementsEqualsWhenNotAllowed(type)) { |
| return false; |
| } |
| // report error |
| _errorReporter.reportErrorForToken( |
| CompileTimeErrorCode.CASE_EXPRESSION_TYPE_IMPLEMENTS_EQUALS, |
| node.keyword, |
| [type.displayName]); |
| return true; |
| } |
| |
| /** |
| * @return `true` if given [Type] implements operator <i>==</i>, and it is not |
| * <i>int</i> or <i>String</i>. |
| */ |
| bool _implementsEqualsWhenNotAllowed(DartType type) { |
| // ignore int or String |
| if (type == null || type == _intType || type == _typeProvider.stringType) { |
| return false; |
| } else if (type == _typeProvider.doubleType) { |
| return true; |
| } |
| // prepare ClassElement |
| Element element = type.element; |
| if (element is! ClassElement) { |
| return false; |
| } |
| ClassElement classElement = element as ClassElement; |
| // lookup for == |
| MethodElement method = |
| classElement.lookUpConcreteMethod("==", _currentLibrary); |
| if (method == null || method.enclosingElement.type.isObject) { |
| return false; |
| } |
| // there is == that we don't like |
| return true; |
| } |
| |
| /** |
| * Given some computed [Expression], this method generates the passed [ErrorCode] on |
| * the node if its' value consists of information from a deferred library. |
| * |
| * @param expression the expression to be tested for a deferred library reference |
| * @param errorCode the error code to be used if the expression is or consists of a reference to a |
| * deferred library |
| */ |
| void _reportErrorIfFromDeferredLibrary(Expression expression, |
| ErrorCode errorCode) { |
| DeferredLibraryReferenceDetector referenceDetector = |
| new DeferredLibraryReferenceDetector(); |
| expression.accept(referenceDetector); |
| if (referenceDetector.result) { |
| _errorReporter.reportErrorForNode(errorCode, expression); |
| } |
| } |
| |
| /** |
| * Report any errors in the given list. Except for special cases, use the given error code rather |
| * than the one reported in the error. |
| * |
| * @param errors the errors that need to be reported |
| * @param errorCode the error code to be used |
| */ |
| void _reportErrors(List<AnalysisError> errors, ErrorCode errorCode) { |
| for (AnalysisError data in errors) { |
| ErrorCode dataErrorCode = data.errorCode; |
| if (identical( |
| dataErrorCode, |
| CompileTimeErrorCode.CONST_EVAL_THROWS_EXCEPTION) || |
| identical(dataErrorCode, CompileTimeErrorCode.CONST_EVAL_THROWS_IDBZE) || |
| identical( |
| dataErrorCode, |
| CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL_NUM_STRING) || |
| identical(dataErrorCode, CompileTimeErrorCode.CONST_EVAL_TYPE_BOOL) || |
| identical(dataErrorCode, CompileTimeErrorCode.CONST_EVAL_TYPE_INT) || |
| identical(dataErrorCode, CompileTimeErrorCode.CONST_EVAL_TYPE_NUM) || |
| identical( |
| dataErrorCode, |
| CheckedModeCompileTimeErrorCode.CONST_CONSTRUCTOR_FIELD_TYPE_MISMATCH) || |
| identical( |
| dataErrorCode, |
| CheckedModeCompileTimeErrorCode.CONST_CONSTRUCTOR_PARAM_TYPE_MISMATCH) || |
| identical( |
| dataErrorCode, |
| CheckedModeCompileTimeErrorCode.VARIABLE_TYPE_MISMATCH)) { |
| _errorReporter.reportError(data); |
| } else if (errorCode != null) { |
| _errorReporter.reportError( |
| new AnalysisError.con2(data.source, data.offset, data.length, errorCode)); |
| } |
| } |
| } |
| |
| /** |
| * Validate that the given expression is a compile time constant. Return the value of the compile |
| * time constant, or `null` if the expression is not a compile time constant. |
| * |
| * @param expression the expression to be validated |
| * @param errorCode the error code to be used if the expression is not a compile time constant |
| * @return the value of the compile time constant |
| */ |
| DartObjectImpl _validate(Expression expression, ErrorCode errorCode) { |
| RecordingErrorListener errorListener = new RecordingErrorListener(); |
| ErrorReporter subErrorReporter = |
| new ErrorReporter(errorListener, _errorReporter.source); |
| DartObjectImpl result = |
| expression.accept(new ConstantVisitor.con1(_typeProvider, subErrorReporter)); |
| _reportErrors(errorListener.errors, errorCode); |
| return result; |
| } |
| |
| /** |
| * Validate that if the passed arguments are constant expressions. |
| * |
| * @param argumentList the argument list to evaluate |
| */ |
| void _validateConstantArguments(ArgumentList argumentList) { |
| for (Expression argument in argumentList.arguments) { |
| if (argument is NamedExpression) { |
| argument = (argument as NamedExpression).expression; |
| } |
| _validate( |
| argument, |
| CompileTimeErrorCode.CONST_WITH_NON_CONSTANT_ARGUMENT); |
| } |
| } |
| |
| /** |
| * Validates that the expressions of the given initializers (of a constant constructor) are all |
| * compile time constants. |
| * |
| * @param constructor the constant constructor declaration to validate |
| */ |
| void _validateConstructorInitializers(ConstructorDeclaration constructor) { |
| List<ParameterElement> parameterElements = |
| constructor.parameters.parameterElements; |
| NodeList<ConstructorInitializer> initializers = constructor.initializers; |
| for (ConstructorInitializer initializer in initializers) { |
| if (initializer is ConstructorFieldInitializer) { |
| ConstructorFieldInitializer fieldInitializer = initializer; |
| _validateInitializerExpression( |
| parameterElements, |
| fieldInitializer.expression); |
| } |
| if (initializer is RedirectingConstructorInvocation) { |
| RedirectingConstructorInvocation invocation = initializer; |
| _validateInitializerInvocationArguments( |
| parameterElements, |
| invocation.argumentList); |
| } |
| if (initializer is SuperConstructorInvocation) { |
| SuperConstructorInvocation invocation = initializer; |
| _validateInitializerInvocationArguments( |
| parameterElements, |
| invocation.argumentList); |
| } |
| } |
| } |
| |
| /** |
| * Validate that the default value associated with each of the parameters in the given list is a |
| * compile time constant. |
| * |
| * @param parameters the list of parameters to be validated |
| */ |
| void _validateDefaultValues(FormalParameterList parameters) { |
| if (parameters == null) { |
| return; |
| } |
| for (FormalParameter parameter in parameters.parameters) { |
| if (parameter is DefaultFormalParameter) { |
| DefaultFormalParameter defaultParameter = parameter; |
| Expression defaultValue = defaultParameter.defaultValue; |
| DartObjectImpl result; |
| if (defaultValue == null) { |
| result = |
| new DartObjectImpl(_typeProvider.nullType, NullState.NULL_STATE); |
| } else { |
| result = |
| _validate(defaultValue, CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE); |
| if (result != null) { |
| _reportErrorIfFromDeferredLibrary( |
| defaultValue, |
| CompileTimeErrorCode.NON_CONSTANT_DEFAULT_VALUE_FROM_DEFERRED_LIBRARY); |
| } |
| } |
| VariableElementImpl element = parameter.element as VariableElementImpl; |
| element.evaluationResult = new EvaluationResultImpl.con1(result); |
| } |
| } |
| } |
| |
| /** |
| * Validates that the expressions of any field initializers in the class declaration are all |
| * compile time constants. Since this is only required if the class has a constant constructor, |
| * the error is reported at the constructor site. |
| * |
| * @param classDeclaration the class which should be validated |
| * @param errorSite the site at which errors should be reported. |
| */ |
| void _validateFieldInitializers(ClassDeclaration classDeclaration, |
| ConstructorDeclaration errorSite) { |
| NodeList<ClassMember> members = classDeclaration.members; |
| for (ClassMember member in members) { |
| if (member is FieldDeclaration) { |
| FieldDeclaration fieldDeclaration = member; |
| if (!fieldDeclaration.isStatic) { |
| for (VariableDeclaration variableDeclaration in |
| fieldDeclaration.fields.variables) { |
| Expression initializer = variableDeclaration.initializer; |
| if (initializer != null) { |
| // Ignore any errors produced during validation--if the constant |
| // can't be eavluated we'll just report a single error. |
| AnalysisErrorListener errorListener = |
| AnalysisErrorListener.NULL_LISTENER; |
| ErrorReporter subErrorReporter = |
| new ErrorReporter(errorListener, _errorReporter.source); |
| DartObjectImpl result = |
| initializer.accept(new ConstantVisitor.con1(_typeProvider, subErrorReporter)); |
| if (result == null) { |
| _errorReporter.reportErrorForNode( |
| CompileTimeErrorCode.CONST_CONSTRUCTOR_WITH_FIELD_INITIALIZED_BY_NON_CONST, |
| errorSite, |
| [variableDeclaration.name.name]); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Validates that the given expression is a compile time constant. |
| * |
| * @param parameterElements the elements of parameters of constant constructor, they are |
| * considered as a valid potentially constant expressions |
| * @param expression the expression to validate |
| */ |
| void _validateInitializerExpression(List<ParameterElement> parameterElements, |
| Expression expression) { |
| RecordingErrorListener errorListener = new RecordingErrorListener(); |
| ErrorReporter subErrorReporter = |
| new ErrorReporter(errorListener, _errorReporter.source); |
| DartObjectImpl result = expression.accept( |
| new _ConstantVerifier_validateInitializerExpression( |
| _typeProvider, |
| subErrorReporter, |
| this, |
| parameterElements)); |
| _reportErrors( |
| errorListener.errors, |
| CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER); |
| if (result != null) { |
| _reportErrorIfFromDeferredLibrary( |
| expression, |
| CompileTimeErrorCode.NON_CONSTANT_VALUE_IN_INITIALIZER_FROM_DEFERRED_LIBRARY); |
| } |
| } |
| |
| /** |
| * Validates that all of the arguments of a constructor initializer are compile time constants. |
| * |
| * @param parameterElements the elements of parameters of constant constructor, they are |
| * considered as a valid potentially constant expressions |
| * @param argumentList the argument list to validate |
| */ |
| void |
| _validateInitializerInvocationArguments(List<ParameterElement> parameterElements, |
| ArgumentList argumentList) { |
| if (argumentList == null) { |
| return; |
| } |
| for (Expression argument in argumentList.arguments) { |
| _validateInitializerExpression(parameterElements, argument); |
| } |
| } |
| |
| /** |
| * Validate that if the passed instance creation is 'const' then all its arguments are constant |
| * expressions. |
| * |
| * @param node the instance creation evaluate |
| */ |
| void _validateInstanceCreationArguments(InstanceCreationExpression node) { |
| if (!node.isConst) { |
| return; |
| } |
| ArgumentList argumentList = node.argumentList; |
| if (argumentList == null) { |
| return; |
| } |
| _validateConstantArguments(argumentList); |
| } |
| } |
| |
| /** |
| * Instances of the class `Dart2JSVerifier` traverse an AST structure looking for hints for |
| * code that will be compiled to JS, such as [HintCode.IS_DOUBLE]. |
| */ |
| class Dart2JSVerifier extends RecursiveAstVisitor<Object> { |
| /** |
| * The name of the `double` type. |
| */ |
| static String _DOUBLE_TYPE_NAME = "double"; |
| |
| /** |
| * The error reporter by which errors will be reported. |
| */ |
| final ErrorReporter _errorReporter; |
| |
| /** |
| * Create a new instance of the [Dart2JSVerifier]. |
| * |
| * @param errorReporter the error reporter |
| */ |
| Dart2JSVerifier(this._errorReporter); |
| |
| @override |
| Object visitIsExpression(IsExpression node) { |
| _checkForIsDoubleHints(node); |
| return super.visitIsExpression(node); |
| } |
| |
| /** |
| * Check for instances of `x is double`, `x is int`, `x is! double` and |
| * `x is! int`. |
| * |
| * @param node the is expression to check |
| * @return `true` if and only if a hint code is generated on the passed node |
| * See [HintCode.IS_DOUBLE], |
| * [HintCode.IS_INT], |
| * [HintCode.IS_NOT_DOUBLE], and |
| * [HintCode.IS_NOT_INT]. |
| */ |
| bool _checkForIsDoubleHints(IsExpression node) { |
| TypeName typeName = node.type; |
| DartType type = typeName.type; |
| if (type != null && type.element != null) { |
| Element element = type.element; |
| String typeNameStr = element.name; |
| LibraryElement libraryElement = element.library; |
| // if (typeNameStr.equals(INT_TYPE_NAME) && libraryElement != null |
| // && libraryElement.isDartCore()) { |
| // if (node.getNotOperator() == null) { |
| // errorReporter.reportError(HintCode.IS_INT, node); |
| // } else { |
| // errorReporter.reportError(HintCode.IS_NOT_INT, node); |
| // } |
| // return true; |
| // } else |
| if (typeNameStr == _DOUBLE_TYPE_NAME && |
| libraryElement != null && |
| libraryElement.isDartCore) { |
| if (node.notOperator == null) { |
| _errorReporter.reportErrorForNode(HintCode.IS_DOUBLE, node); |
| } else { |
| _errorReporter.reportErrorForNode(HintCode.IS_NOT_DOUBLE, node); |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| } |
| |
| /** |
| * Instances of the class `DeadCodeVerifier` traverse an AST structure looking for cases of |
| * [HintCode.DEAD_CODE]. |
| */ |
| class DeadCodeVerifier extends RecursiveAstVisitor<Object> { |
| /** |
| * The error reporter by which errors will be reported. |
| */ |
| final ErrorReporter _errorReporter; |
| |
| /** |
| * Create a new instance of the [DeadCodeVerifier]. |
| * |
| * @param errorReporter the error reporter |
| */ |
| DeadCodeVerifier(this._errorReporter); |
| |
| @override |
| Object visitBinaryExpression(BinaryExpression node) { |
| sc.Token operator = node.operator; |
| bool isAmpAmp = operator.type == sc.TokenType.AMPERSAND_AMPERSAND; |
| bool isBarBar = operator.type == sc.TokenType.BAR_BAR; |
| if (isAmpAmp || isBarBar) { |
| Expression lhsCondition = node.leftOperand; |
| if (!_isDebugConstant(lhsCondition)) { |
| EvaluationResultImpl lhsResult = _getConstantBooleanValue(lhsCondition); |
| if (lhsResult != null) { |
| if (lhsResult.value.isTrue && isBarBar) { |
| // report error on else block: true || !e! |
| _errorReporter.reportErrorForNode( |
| HintCode.DEAD_CODE, |
| node.rightOperand); |
| // only visit the LHS: |
| _safelyVisit(lhsCondition); |
| return null; |
| } else if (lhsResult.value.isFalse && isAmpAmp) { |
| // report error on if block: false && !e! |
| _errorReporter.reportErrorForNode( |
| HintCode.DEAD_CODE, |
| node.rightOperand); |
| // only visit the LHS: |
| _safelyVisit(lhsCondition); |
| return null; |
| } |
| } |
| } |
| // How do we want to handle the RHS? It isn't dead code, but "pointless" |
| // or "obscure"... |
| // Expression rhsCondition = node.getRightOperand(); |
| // ValidResult rhsResult = getConstantBooleanValue(rhsCondition); |
| // if (rhsResult != null) { |
| // if (rhsResult == ValidResult.RESULT_TRUE && isBarBar) { |
| // // report error on else block: !e! || true |
| // errorReporter.reportError(HintCode.DEAD_CODE, node.getRightOperand()); |
| // // only visit the RHS: |
| // safelyVisit(rhsCondition); |
| // return null; |
| // } else if (rhsResult == ValidResult.RESULT_FALSE && isAmpAmp) { |
| // // report error on if block: !e! && false |
| // errorReporter.reportError(HintCode.DEAD_CODE, node.getRightOperand()); |
| // // only visit the RHS: |
| // safelyVisit(rhsCondition); |
| // return null; |
| // } |
| // } |
| } |
| return super.visitBinaryExpression(node); |
| } |
| |
| /** |
| * For each [Block], this method reports and error on all statements between the end of the |
| * block and the first return statement (assuming there it is not at the end of the block.) |
| * |
| * @param node the block to evaluate |
| */ |
| @override |
| Object visitBlock(Block node) { |
| NodeList<Statement> statements = node.statements; |
| _checkForDeadStatementsInNodeList(statements); |
| return null; |
| } |
| |
| @override |
| Object visitConditionalExpression(ConditionalExpression node) { |
| Expression conditionExpression = node.condition; |
| _safelyVisit(conditionExpression); |
| if (!_isDebugConstant(conditionExpression)) { |
| EvaluationResultImpl result = |
| _getConstantBooleanValue(conditionExpression); |
| if (result != null) { |
| if (result.value.isTrue) { |
| // report error on else block: true ? 1 : !2! |
| _errorReporter.reportErrorForNode( |
| HintCode.DEAD_CODE, |
| node.elseExpression); |
| _safelyVisit(node.thenExpression); |
| return null; |
| } else { |
| // report error on if block: false ? !1! : 2 |
| _errorReporter.reportErrorForNode( |
| HintCode.DEAD_CODE, |
| node.thenExpression); |
| _safelyVisit(node.elseExpression); |
| return null; |
| } |
| } |
| } |
| return super.visitConditionalExpression(node); |
| } |
| |
| @override |
| Object visitIfStatement(IfStatement node) { |
| Expression conditionExpression = node.condition; |
| _safelyVisit(conditionExpression); |
| if (!_isDebugConstant(conditionExpression)) { |
| EvaluationResultImpl result = |
| _getConstantBooleanValue(conditionExpression); |
| if (result != null) { |
| if (result.value.isTrue) { |
| // report error on else block: if(true) {} else {!} |
| Statement elseStatement = node.elseStatement; |
| if (elseStatement != null) { |
| _errorReporter.reportErrorForNode( |
| HintCode.DEAD_CODE, |
| elseStatement); |
| _safelyVisit(node.thenStatement); |
| return null; |
| } |
| } else { |
| // report error on if block: if (false) {!} else {} |
| _errorReporter.reportErrorForNode( |
| HintCode.DEAD_CODE, |
| node.thenStatement); |
| _safelyVisit(node.elseStatement); |
| return null; |
| } |
| } |
| } |
| return super.visitIfStatement(node); |
| } |
| |
| @override |
| Object visitSwitchCase(SwitchCase node) { |
| _checkForDeadStatementsInNodeList(node.statements); |
| return super.visitSwitchCase(node); |
| } |
| |
| @override |
| Object visitSwitchDefault(SwitchDefault node) { |
| _checkForDeadStatementsInNodeList(node.statements); |
| return super.visitSwitchDefault(node); |
| } |
| |
| @override |
| Object visitTryStatement(TryStatement node) { |
| _safelyVisit(node.body); |
| _safelyVisit(node.finallyBlock); |
| NodeList<CatchClause> catchClauses = node.catchClauses; |
| int numOfCatchClauses = catchClauses.length; |
| List<DartType> visitedTypes = new List<DartType>(); |
| for (int i = 0; i < numOfCatchClauses; i++) { |
| CatchClause catchClause = catchClauses[i]; |
| if (catchClause.onKeyword != null) { |
| // on-catch clause found, verify that the exception type is not a |
| // subtype of a previous on-catch exception type |
| TypeName typeName = catchClause.exceptionType; |
| if (typeName != null && typeName.type != null) { |
| DartType currentType = typeName.type; |
| if (currentType.isObject) { |
| // Found catch clause clause that has Object as an exception type, |
| // this is equivalent to having a catch clause that doesn't have an |
| // exception type, visit the block, but generate an error on any |
| // following catch clauses (and don't visit them). |
| _safelyVisit(catchClause); |
| if (i + 1 != numOfCatchClauses) { |
| // this catch clause is not the last in the try statement |
| CatchClause nextCatchClause = catchClauses[i + 1]; |
| CatchClause lastCatchClause = catchClauses[numOfCatchClauses - 1]; |
| int offset = nextCatchClause.offset; |
| int length = lastCatchClause.end - offset; |
| _errorReporter.reportErrorForOffset( |
| HintCode.DEAD_CODE_CATCH_FOLLOWING_CATCH, |
| offset, |
| length); |
| return null; |
| } |
| } |
| for (DartType type in visitedTypes) { |
| if (currentType.isSubtypeOf(type)) { |
| CatchClause lastCatchClause = catchClauses[numOfCatchClauses - 1]; |
| int offset = catchClause.offset; |
| int length = lastCatchClause.end - offset; |
| _errorReporter.reportErrorForOffset( |
| HintCode.DEAD_CODE_ON_CATCH_SUBTYPE, |
| offset, |
| length, |
| [currentType.displayName, type.displayName]); |
| return null; |
| } |
| } |
| visitedTypes.add(currentType); |
| } |
| _safelyVisit(catchClause); |
| } else { |
| // Found catch clause clause that doesn't have an exception type, |
| // visit the block, but generate an error on any following catch clauses |
| // (and don't visit them). |
| _safelyVisit(catchClause); |
| if (i + 1 != numOfCatchClauses) { |
| // this catch clause is not the last in the try statement |
| CatchClause nextCatchClause = catchClauses[i + 1]; |
| CatchClause lastCatchClause = catchClauses[numOfCatchClauses - 1]; |
| int offset = nextCatchClause.offset; |
| int length = lastCatchClause.end - offset; |
| _errorReporter.reportErrorForOffset( |
| HintCode.DEAD_CODE_CATCH_FOLLOWING_CATCH, |
| offset, |
| length); |
| return null; |
| } |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitWhileStatement(WhileStatement node) { |
| Expression conditionExpression = node.condition; |
| _safelyVisit(conditionExpression); |
| if (!_isDebugConstant(conditionExpression)) { |
| EvaluationResultImpl result = |
| _getConstantBooleanValue(conditionExpression); |
| if (result != null) { |
| if (result.value.isFalse) { |
| // report error on if block: while (false) {!} |
| _errorReporter.reportErrorForNode(HintCode.DEAD_CODE, node.body); |
| return null; |
| } |
| } |
| } |
| _safelyVisit(node.body); |
| return null; |
| } |
| |
| /** |
| * Given some [NodeList] of [Statement]s, from either a [Block] or |
| * [SwitchMember], this loops through the list in reverse order searching for statements |
| * after a return, unlabeled break or unlabeled continue statement to mark them as dead code. |
| * |
| * @param statements some ordered list of statements in a [Block] or [SwitchMember] |
| */ |
| void _checkForDeadStatementsInNodeList(NodeList<Statement> statements) { |
| int size = statements.length; |
| for (int i = 0; i < size; i++) { |
| Statement currentStatement = statements[i]; |
| _safelyVisit(currentStatement); |
| bool returnOrBreakingStatement = |
| currentStatement is ReturnStatement || |
| (currentStatement is BreakStatement && currentStatement.label == null) || |
| (currentStatement is ContinueStatement && currentStatement.label == null); |
| if (returnOrBreakingStatement && i != size - 1) { |
| Statement nextStatement = statements[i + 1]; |
| Statement lastStatement = statements[size - 1]; |
| int offset = nextStatement.offset; |
| int length = lastStatement.end - offset; |
| _errorReporter.reportErrorForOffset(HintCode.DEAD_CODE, offset, length); |
| return; |
| } |
| } |
| } |
| |
| /** |
| * Given some [Expression], this method returns [ValidResult.RESULT_TRUE] if it is |
| * `true`, [ValidResult.RESULT_FALSE] if it is `false`, or `null` if the |
| * expression is not a constant boolean value. |
| * |
| * @param expression the expression to evaluate |
| * @return [ValidResult.RESULT_TRUE] if it is `true`, [ValidResult.RESULT_FALSE] |
| * if it is `false`, or `null` if the expression is not a constant boolean |
| * value |
| */ |
| EvaluationResultImpl _getConstantBooleanValue(Expression expression) { |
| if (expression is BooleanLiteral) { |
| if (expression.value) { |
| return new EvaluationResultImpl.con1( |
| new DartObjectImpl(null, BoolState.from(true))); |
| } else { |
| return new EvaluationResultImpl.con1( |
| new DartObjectImpl(null, BoolState.from(false))); |
| } |
| } |
| // Don't consider situations where we could evaluate to a constant boolean |
| // expression with the ConstantVisitor |
| // else { |
| // EvaluationResultImpl result = expression.accept(new ConstantVisitor()); |
| // if (result == ValidResult.RESULT_TRUE) { |
| // return ValidResult.RESULT_TRUE; |
| // } else if (result == ValidResult.RESULT_FALSE) { |
| // return ValidResult.RESULT_FALSE; |
| // } |
| // return null; |
| // } |
| return null; |
| } |
| |
| /** |
| * Return `true` if and only if the passed expression is resolved to a constant variable. |
| * |
| * @param expression some conditional expression |
| * @return `true` if and only if the passed expression is resolved to a constant variable |
| */ |
| bool _isDebugConstant(Expression expression) { |
| Element element = null; |
| if (expression is Identifier) { |
| Identifier identifier = expression; |
| element = identifier.staticElement; |
| } else if (expression is PropertyAccess) { |
| PropertyAccess propertyAccess = expression; |
| element = propertyAccess.propertyName.staticElement; |
| } |
| if (element is PropertyAccessorElement) { |
| PropertyAccessorElement pae = element as PropertyAccessorElement; |
| PropertyInducingElement variable = pae.variable; |
| return variable != null && variable.isConst; |
| } |
| return false; |
| } |
| |
| /** |
| * If the given node is not `null`, visit this instance of the dead code verifier. |
| * |
| * @param node the node to be visited |
| */ |
| void _safelyVisit(AstNode node) { |
| if (node != null) { |
| node.accept(this); |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `DeclarationResolver` are used to resolve declarations in an AST |
| * structure to already built elements. |
| */ |
| class DeclarationResolver extends RecursiveAstVisitor<Object> { |
| /** |
| * The compilation unit containing the AST nodes being visited. |
| */ |
| CompilationUnitElement _enclosingUnit; |
| |
| /** |
| * The function type alias containing the AST nodes being visited, or `null` if we are not |
| * in the scope of a function type alias. |
| */ |
| FunctionTypeAliasElement _enclosingAlias; |
| |
| /** |
| * The class containing the AST nodes being visited, or `null` if we are not in the scope of |
| * a class. |
| */ |
| ClassElement _enclosingClass; |
| |
| /** |
| * The method or function containing the AST nodes being visited, or `null` if we are not in |
| * the scope of a method or function. |
| */ |
| ExecutableElement _enclosingExecutable; |
| |
| /** |
| * The parameter containing the AST nodes being visited, or `null` if we are not in the |
| * scope of a parameter. |
| */ |
| ParameterElement _enclosingParameter; |
| |
| /** |
| * Resolve the declarations within the given compilation unit to the elements rooted at the given |
| * element. |
| * |
| * @param unit the compilation unit to be resolved |
| * @param element the root of the element model used to resolve the AST nodes |
| */ |
| void resolve(CompilationUnit unit, CompilationUnitElement element) { |
| _enclosingUnit = element; |
| unit.element = element; |
| unit.accept(this); |
| } |
| |
| @override |
| Object visitCatchClause(CatchClause node) { |
| SimpleIdentifier exceptionParameter = node.exceptionParameter; |
| if (exceptionParameter != null) { |
| List<LocalVariableElement> localVariables = |
| _enclosingExecutable.localVariables; |
| _findIdentifier(localVariables, exceptionParameter); |
| SimpleIdentifier stackTraceParameter = node.stackTraceParameter; |
| if (stackTraceParameter != null) { |
| _findIdentifier(localVariables, stackTraceParameter); |
| } |
| } |
| return super.visitCatchClause(node); |
| } |
| |
| @override |
| Object visitClassDeclaration(ClassDeclaration node) { |
| ClassElement outerClass = _enclosingClass; |
| try { |
| SimpleIdentifier className = node.name; |
| _enclosingClass = _findIdentifier(_enclosingUnit.types, className); |
| return super.visitClassDeclaration(node); |
| } finally { |
| _enclosingClass = outerClass; |
| } |
| } |
| |
| @override |
| Object visitClassTypeAlias(ClassTypeAlias node) { |
| ClassElement outerClass = _enclosingClass; |
| try { |
| SimpleIdentifier className = node.name; |
| _enclosingClass = _findIdentifier(_enclosingUnit.types, className); |
| return super.visitClassTypeAlias(node); |
| } finally { |
| _enclosingClass = outerClass; |
| } |
| } |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| ExecutableElement outerExecutable = _enclosingExecutable; |
| try { |
| SimpleIdentifier constructorName = node.name; |
| if (constructorName == null) { |
| _enclosingExecutable = _enclosingClass.unnamedConstructor; |
| } else { |
| _enclosingExecutable = |
| _enclosingClass.getNamedConstructor(constructorName.name); |
| constructorName.staticElement = _enclosingExecutable; |
| } |
| node.element = _enclosingExecutable as ConstructorElement; |
| return super.visitConstructorDeclaration(node); |
| } finally { |
| _enclosingExecutable = outerExecutable; |
| } |
| } |
| |
| @override |
| Object visitDeclaredIdentifier(DeclaredIdentifier node) { |
| SimpleIdentifier variableName = node.identifier; |
| _findIdentifier(_enclosingExecutable.localVariables, variableName); |
| return super.visitDeclaredIdentifier(node); |
| } |
| |
| @override |
| Object visitDefaultFormalParameter(DefaultFormalParameter node) { |
| SimpleIdentifier parameterName = node.parameter.identifier; |
| ParameterElement element = _getElementForParameter(node, parameterName); |
| Expression defaultValue = node.defaultValue; |
| if (defaultValue != null) { |
| ExecutableElement outerExecutable = _enclosingExecutable; |
| try { |
| if (element == null) { |
| // TODO(brianwilkerson) Report this internal error. |
| } else { |
| _enclosingExecutable = element.initializer; |
| } |
| defaultValue.accept(this); |
| } finally { |
| _enclosingExecutable = outerExecutable; |
| } |
| } |
| ParameterElement outerParameter = _enclosingParameter; |
| try { |
| _enclosingParameter = element; |
| return super.visitDefaultFormalParameter(node); |
| } finally { |
| _enclosingParameter = outerParameter; |
| } |
| } |
| |
| @override |
| Object visitEnumDeclaration(EnumDeclaration node) { |
| ClassElement enclosingEnum = |
| _findIdentifier(_enclosingUnit.enums, node.name); |
| List<FieldElement> constants = enclosingEnum.fields; |
| for (EnumConstantDeclaration constant in node.constants) { |
| _findIdentifier(constants, constant.name); |
| } |
| return super.visitEnumDeclaration(node); |
| } |
| |
| @override |
| Object visitExportDirective(ExportDirective node) { |
| String uri = _getStringValue(node.uri); |
| if (uri != null) { |
| LibraryElement library = _enclosingUnit.library; |
| ExportElement exportElement = _findExport( |
| library.exports, |
| _enclosingUnit.context.sourceFactory.resolveUri(_enclosingUnit.source, uri)); |
| node.element = exportElement; |
| } |
| return super.visitExportDirective(node); |
| } |
| |
| @override |
| Object visitFieldFormalParameter(FieldFormalParameter node) { |
| if (node.parent is! DefaultFormalParameter) { |
| SimpleIdentifier parameterName = node.identifier; |
| ParameterElement element = _getElementForParameter(node, parameterName); |
| ParameterElement outerParameter = _enclosingParameter; |
| try { |
| _enclosingParameter = element; |
| return super.visitFieldFormalParameter(node); |
| } finally { |
| _enclosingParameter = outerParameter; |
| } |
| } else { |
| return super.visitFieldFormalParameter(node); |
| } |
| } |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) { |
| ExecutableElement outerExecutable = _enclosingExecutable; |
| try { |
| SimpleIdentifier functionName = node.name; |
| sc.Token property = node.propertyKeyword; |
| if (property == null) { |
| if (_enclosingExecutable != null) { |
| _enclosingExecutable = |
| _findIdentifier(_enclosingExecutable.functions, functionName); |
| } else { |
| _enclosingExecutable = |
| _findIdentifier(_enclosingUnit.functions, functionName); |
| } |
| } else { |
| PropertyAccessorElement accessor = |
| _findIdentifier(_enclosingUnit.accessors, functionName); |
| if ((property as sc.KeywordToken).keyword == sc.Keyword.SET) { |
| accessor = accessor.variable.setter; |
| functionName.staticElement = accessor; |
| } |
| _enclosingExecutable = accessor; |
| } |
| node.functionExpression.element = _enclosingExecutable; |
| return super.visitFunctionDeclaration(node); |
| } finally { |
| _enclosingExecutable = outerExecutable; |
| } |
| } |
| |
| @override |
| Object visitFunctionExpression(FunctionExpression node) { |
| if (node.parent is! FunctionDeclaration) { |
| FunctionElement element = |
| _findAtOffset(_enclosingExecutable.functions, node.beginToken.offset); |
| node.element = element; |
| } |
| ExecutableElement outerExecutable = _enclosingExecutable; |
| try { |
| _enclosingExecutable = node.element; |
| return super.visitFunctionExpression(node); |
| } finally { |
| _enclosingExecutable = outerExecutable; |
| } |
| } |
| |
| @override |
| Object visitFunctionTypeAlias(FunctionTypeAlias node) { |
| FunctionTypeAliasElement outerAlias = _enclosingAlias; |
| try { |
| SimpleIdentifier aliasName = node.name; |
| _enclosingAlias = |
| _findIdentifier(_enclosingUnit.functionTypeAliases, aliasName); |
| return super.visitFunctionTypeAlias(node); |
| } finally { |
| _enclosingAlias = outerAlias; |
| } |
| } |
| |
| @override |
| Object visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) { |
| if (node.parent is! DefaultFormalParameter) { |
| SimpleIdentifier parameterName = node.identifier; |
| ParameterElement element = _getElementForParameter(node, parameterName); |
| ParameterElement outerParameter = _enclosingParameter; |
| try { |
| _enclosingParameter = element; |
| return super.visitFunctionTypedFormalParameter(node); |
| } finally { |
| _enclosingParameter = outerParameter; |
| } |
| } else { |
| return super.visitFunctionTypedFormalParameter(node); |
| } |
| } |
| |
| @override |
| Object visitImportDirective(ImportDirective node) { |
| String uri = _getStringValue(node.uri); |
| if (uri != null) { |
| LibraryElement library = _enclosingUnit.library; |
| ImportElement importElement = _findImport( |
| library.imports, |
| _enclosingUnit.context.sourceFactory.resolveUri(_enclosingUnit.source, uri), |
| node.prefix); |
| node.element = importElement; |
| } |
| return super.visitImportDirective(node); |
| } |
| |
| @override |
| Object visitLabeledStatement(LabeledStatement node) { |
| for (Label label in node.labels) { |
| SimpleIdentifier labelName = label.label; |
| _findIdentifier(_enclosingExecutable.labels, labelName); |
| } |
| return super.visitLabeledStatement(node); |
| } |
| |
| @override |
| Object visitLibraryDirective(LibraryDirective node) { |
| node.element = _enclosingUnit.library; |
| return super.visitLibraryDirective(node); |
| } |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| ExecutableElement outerExecutable = _enclosingExecutable; |
| try { |
| sc.Token property = node.propertyKeyword; |
| SimpleIdentifier methodName = node.name; |
| String nameOfMethod = methodName.name; |
| if (nameOfMethod == sc.TokenType.MINUS.lexeme && |
| node.parameters.parameters.length == 0) { |
| nameOfMethod = "unary-"; |
| } |
| if (property == null) { |
| _enclosingExecutable = _findWithNameAndOffset( |
| _enclosingClass.methods, |
| nameOfMethod, |
| methodName.offset); |
| methodName.staticElement = _enclosingExecutable; |
| } else { |
| PropertyAccessorElement accessor = |
| _findIdentifier(_enclosingClass.accessors, methodName); |
| if ((property as sc.KeywordToken).keyword == sc.Keyword.SET) { |
| accessor = accessor.variable.setter; |
| methodName.staticElement = accessor; |
| } |
| _enclosingExecutable = accessor; |
| } |
| return super.visitMethodDeclaration(node); |
| } finally { |
| _enclosingExecutable = outerExecutable; |
| } |
| } |
| |
| @override |
| Object visitPartDirective(PartDirective node) { |
| String uri = _getStringValue(node.uri); |
| if (uri != null) { |
| Source partSource = |
| _enclosingUnit.context.sourceFactory.resolveUri(_enclosingUnit.source, uri); |
| node.element = _findPart(_enclosingUnit.library.parts, partSource); |
| } |
| return super.visitPartDirective(node); |
| } |
| |
| @override |
| Object visitPartOfDirective(PartOfDirective node) { |
| node.element = _enclosingUnit.library; |
| return super.visitPartOfDirective(node); |
| } |
| |
| @override |
| Object visitSimpleFormalParameter(SimpleFormalParameter node) { |
| if (node.parent is! DefaultFormalParameter) { |
| SimpleIdentifier parameterName = node.identifier; |
| ParameterElement element = _getElementForParameter(node, parameterName); |
| ParameterElement outerParameter = _enclosingParameter; |
| try { |
| _enclosingParameter = element; |
| return super.visitSimpleFormalParameter(node); |
| } finally { |
| _enclosingParameter = outerParameter; |
| } |
| } else { |
| } |
| return super.visitSimpleFormalParameter(node); |
| } |
| |
| @override |
| Object visitSwitchCase(SwitchCase node) { |
| for (Label label in node.labels) { |
| SimpleIdentifier labelName = label.label; |
| _findIdentifier(_enclosingExecutable.labels, labelName); |
| } |
| return super.visitSwitchCase(node); |
| } |
| |
| @override |
| Object visitSwitchDefault(SwitchDefault node) { |
| for (Label label in node.labels) { |
| SimpleIdentifier labelName = label.label; |
| _findIdentifier(_enclosingExecutable.labels, labelName); |
| } |
| return super.visitSwitchDefault(node); |
| } |
| |
| @override |
| Object visitTypeParameter(TypeParameter node) { |
| SimpleIdentifier parameterName = node.name; |
| if (_enclosingClass != null) { |
| _findIdentifier(_enclosingClass.typeParameters, parameterName); |
| } else if (_enclosingAlias != null) { |
| _findIdentifier(_enclosingAlias.typeParameters, parameterName); |
| } |
| return super.visitTypeParameter(node); |
| } |
| |
| @override |
| Object visitVariableDeclaration(VariableDeclaration node) { |
| VariableElement element = null; |
| SimpleIdentifier variableName = node.name; |
| if (_enclosingExecutable != null) { |
| element = |
| _findIdentifier(_enclosingExecutable.localVariables, variableName); |
| } |
| if (element == null && _enclosingClass != null) { |
| element = _findIdentifier(_enclosingClass.fields, variableName); |
| } |
| if (element == null && _enclosingUnit != null) { |
| element = _findIdentifier(_enclosingUnit.topLevelVariables, variableName); |
| } |
| Expression initializer = node.initializer; |
| if (initializer != null) { |
| ExecutableElement outerExecutable = _enclosingExecutable; |
| try { |
| if (element == null) { |
| // TODO(brianwilkerson) Report this internal error. |
| } else { |
| _enclosingExecutable = element.initializer; |
| } |
| return super.visitVariableDeclaration(node); |
| } finally { |
| _enclosingExecutable = outerExecutable; |
| } |
| } |
| return super.visitVariableDeclaration(node); |
| } |
| |
| /** |
| * Return the element in the given array of elements that was created for the declaration at the |
| * given offset. This method should only be used when there is no name |
| * |
| * @param elements the elements of the appropriate kind that exist in the current context |
| * @param offset the offset of the name of the element to be returned |
| * @return the element at the given offset |
| */ |
| Element _findAtOffset(List<Element> elements, int offset) => |
| _findWithNameAndOffset(elements, "", offset); |
| |
| /** |
| * Return the export element from the given array whose library has the given source, or |
| * `null` if there is no such export. |
| * |
| * @param exports the export elements being searched |
| * @param source the source of the library associated with the export element to being searched |
| * for |
| * @return the export element whose library has the given source |
| */ |
| ExportElement _findExport(List<ExportElement> exports, Source source) { |
| for (ExportElement export in exports) { |
| if (export.exportedLibrary.source == source) { |
| return export; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Return the element in the given array of elements that was created for the declaration with the |
| * given name. |
| * |
| * @param elements the elements of the appropriate kind that exist in the current context |
| * @param identifier the name node in the declaration of the element to be returned |
| * @return the element created for the declaration with the given name |
| */ |
| Element _findIdentifier(List<Element> elements, SimpleIdentifier identifier) { |
| Element element = |
| _findWithNameAndOffset(elements, identifier.name, identifier.offset); |
| identifier.staticElement = element; |
| return element; |
| } |
| |
| /** |
| * Return the import element from the given array whose library has the given source and that has |
| * the given prefix, or `null` if there is no such import. |
| * |
| * @param imports the import elements being searched |
| * @param source the source of the library associated with the import element to being searched |
| * for |
| * @param prefix the prefix with which the library was imported |
| * @return the import element whose library has the given source and prefix |
| */ |
| ImportElement _findImport(List<ImportElement> imports, Source source, |
| SimpleIdentifier prefix) { |
| for (ImportElement element in imports) { |
| if (element.importedLibrary.source == source) { |
| PrefixElement prefixElement = element.prefix; |
| if (prefix == null) { |
| if (prefixElement == null) { |
| return element; |
| } |
| } else { |
| if (prefixElement != null && |
| prefix.name == prefixElement.displayName) { |
| return element; |
| } |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Return the element for the part with the given source, or `null` if there is no element |
| * for the given source. |
| * |
| * @param parts the elements for the parts |
| * @param partSource the source for the part whose element is to be returned |
| * @return the element for the part with the given source |
| */ |
| CompilationUnitElement _findPart(List<CompilationUnitElement> parts, |
| Source partSource) { |
| for (CompilationUnitElement part in parts) { |
| if (part.source == partSource) { |
| return part; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Return the element in the given array of elements that was created for the declaration with the |
| * given name at the given offset. |
| * |
| * @param elements the elements of the appropriate kind that exist in the current context |
| * @param name the name of the element to be returned |
| * @param offset the offset of the name of the element to be returned |
| * @return the element with the given name and offset |
| */ |
| Element _findWithNameAndOffset(List<Element> elements, String name, |
| int offset) { |
| for (Element element in elements) { |
| if (element.displayName == name && element.nameOffset == offset) { |
| return element; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Search the most closely enclosing list of parameters for a parameter with the given name. |
| * |
| * @param node the node defining the parameter with the given name |
| * @param parameterName the name of the parameter being searched for |
| * @return the element representing the parameter with that name |
| */ |
| ParameterElement _getElementForParameter(FormalParameter node, |
| SimpleIdentifier parameterName) { |
| List<ParameterElement> parameters = null; |
| if (_enclosingParameter != null) { |
| parameters = _enclosingParameter.parameters; |
| } |
| if (parameters == null && _enclosingExecutable != null) { |
| parameters = _enclosingExecutable.parameters; |
| } |
| if (parameters == null && _enclosingAlias != null) { |
| parameters = _enclosingAlias.parameters; |
| } |
| ParameterElement element = |
| parameters == null ? null : _findIdentifier(parameters, parameterName); |
| if (element == null) { |
| StringBuffer buffer = new StringBuffer(); |
| buffer.writeln("Invalid state found in the Analysis Engine:"); |
| buffer.writeln( |
| "DeclarationResolver.getElementForParameter() is visiting a parameter that does not appear to be in a method or function."); |
| buffer.writeln("Ancestors:"); |
| AstNode parent = node.parent; |
| while (parent != null) { |
| buffer.writeln(parent.runtimeType.toString()); |
| buffer.writeln("---------"); |
| parent = parent.parent; |
| } |
| AnalysisEngine.instance.logger.logError( |
| buffer.toString(), |
| new CaughtException(new AnalysisException(), null)); |
| } |
| return element; |
| } |
| |
| /** |
| * Return the value of the given string literal, or `null` if the string is not a constant |
| * string without any string interpolation. |
| * |
| * @param literal the string literal whose value is to be returned |
| * @return the value of the given string literal |
| */ |
| String _getStringValue(StringLiteral literal) { |
| if (literal is StringInterpolation) { |
| return null; |
| } |
| return literal.stringValue; |
| } |
| } |
| |
| /** |
| * Instances of the class `ElementBuilder` traverse an AST structure and build the element |
| * model representing the AST structure. |
| */ |
| class ElementBuilder extends RecursiveAstVisitor<Object> { |
| /** |
| * The element holder associated with the element that is currently being built. |
| */ |
| ElementHolder _currentHolder; |
| |
| /** |
| * A flag indicating whether a variable declaration is in the context of a field declaration. |
| */ |
| bool _inFieldContext = false; |
| |
| /** |
| * A flag indicating whether a variable declaration is within the body of a method or function. |
| */ |
| bool _inFunction = false; |
| |
| /** |
| * A flag indicating whether the class currently being visited can be used as a mixin. |
| */ |
| bool _isValidMixin = false; |
| |
| /** |
| * A collection holding the function types defined in a class that need to have their type |
| * arguments set to the types of the type parameters for the class, or `null` if we are not |
| * currently processing nodes within a class. |
| */ |
| List<FunctionTypeImpl> _functionTypesToFix = null; |
| |
| /** |
| * A table mapping field names to field elements for the fields defined in the current class, or |
| * `null` if we are not in the scope of a class. |
| */ |
| HashMap<String, FieldElement> _fieldMap; |
| |
| /** |
| * Initialize a newly created element builder to build the elements for a compilation unit. |
| * |
| * @param initialHolder the element holder associated with the compilation unit being built |
| */ |
| ElementBuilder(ElementHolder initialHolder) { |
| _currentHolder = initialHolder; |
| } |
| |
| @override |
| Object visitBlock(Block node) { |
| bool wasInField = _inFieldContext; |
| _inFieldContext = false; |
| try { |
| node.visitChildren(this); |
| } finally { |
| _inFieldContext = wasInField; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitCatchClause(CatchClause node) { |
| SimpleIdentifier exceptionParameter = node.exceptionParameter; |
| if (exceptionParameter != null) { |
| // exception |
| LocalVariableElementImpl exception = |
| new LocalVariableElementImpl.forNode(exceptionParameter); |
| _currentHolder.addLocalVariable(exception); |
| exceptionParameter.staticElement = exception; |
| // stack trace |
| SimpleIdentifier stackTraceParameter = node.stackTraceParameter; |
| if (stackTraceParameter != null) { |
| LocalVariableElementImpl stackTrace = |
| new LocalVariableElementImpl.forNode(stackTraceParameter); |
| _currentHolder.addLocalVariable(stackTrace); |
| stackTraceParameter.staticElement = stackTrace; |
| } |
| } |
| return super.visitCatchClause(node); |
| } |
| |
| @override |
| Object visitClassDeclaration(ClassDeclaration node) { |
| ElementHolder holder = new ElementHolder(); |
| _isValidMixin = true; |
| _functionTypesToFix = new List<FunctionTypeImpl>(); |
| // |
| // Process field declarations before constructors and methods so that field |
| // formal parameters can be correctly resolved to their fields. |
| // |
| ElementHolder previousHolder = _currentHolder; |
| _currentHolder = holder; |
| try { |
| List<ClassMember> nonFields = new List<ClassMember>(); |
| node.visitChildren( |
| new _ElementBuilder_visitClassDeclaration(this, nonFields)); |
| _buildFieldMap(holder.fieldsWithoutFlushing); |
| int count = nonFields.length; |
| for (int i = 0; i < count; i++) { |
| nonFields[i].accept(this); |
| } |
| } finally { |
| _currentHolder = previousHolder; |
| } |
| SimpleIdentifier className = node.name; |
| ClassElementImpl element = new ClassElementImpl.forNode(className); |
| List<TypeParameterElement> typeParameters = holder.typeParameters; |
| List<DartType> typeArguments = _createTypeParameterTypes(typeParameters); |
| InterfaceTypeImpl interfaceType = new InterfaceTypeImpl.con1(element); |
| interfaceType.typeArguments = typeArguments; |
| element.type = interfaceType; |
| List<ConstructorElement> constructors = holder.constructors; |
| if (constructors.length == 0) { |
| // |
| // Create the default constructor. |
| // |
| constructors = _createDefaultConstructors(interfaceType); |
| } |
| element.abstract = node.isAbstract; |
| element.accessors = holder.accessors; |
| element.constructors = constructors; |
| element.fields = holder.fields; |
| element.methods = holder.methods; |
| element.typeParameters = typeParameters; |
| element.validMixin = _isValidMixin; |
| int functionTypeCount = _functionTypesToFix.length; |
| for (int i = 0; i < functionTypeCount; i++) { |
| _functionTypesToFix[i].typeArguments = typeArguments; |
| } |
| _functionTypesToFix = null; |
| _currentHolder.addType(element); |
| className.staticElement = element; |
| _fieldMap = null; |
| holder.validate(); |
| return null; |
| } |
| |
| /** |
| * Implementation of this method should be synchronized with |
| * [visitClassDeclaration]. |
| */ |
| void visitClassDeclarationIncrementally(ClassDeclaration node) { |
| // |
| // Process field declarations before constructors and methods so that field |
| // formal parameters can be correctly resolved to their fields. |
| // |
| ClassElement classElement = node.element; |
| _buildFieldMap(classElement.fields); |
| } |
| |
| @override |
| Object visitClassTypeAlias(ClassTypeAlias node) { |
| ElementHolder holder = new ElementHolder(); |
| _functionTypesToFix = new List<FunctionTypeImpl>(); |
| _visitChildren(holder, node); |
| SimpleIdentifier className = node.name; |
| ClassElementImpl element = new ClassElementImpl.forNode(className); |
| element.abstract = node.abstractKeyword != null; |
| element.typedef = true; |
| List<TypeParameterElement> typeParameters = holder.typeParameters; |
| element.typeParameters = typeParameters; |
| List<DartType> typeArguments = _createTypeParameterTypes(typeParameters); |
| InterfaceTypeImpl interfaceType = new InterfaceTypeImpl.con1(element); |
| interfaceType.typeArguments = typeArguments; |
| element.type = interfaceType; |
| // set default constructor |
| element.constructors = _createDefaultConstructors(interfaceType); |
| for (FunctionTypeImpl functionType in _functionTypesToFix) { |
| functionType.typeArguments = typeArguments; |
| } |
| _functionTypesToFix = null; |
| _currentHolder.addType(element); |
| className.staticElement = element; |
| holder.validate(); |
| return null; |
| } |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| _isValidMixin = false; |
| ElementHolder holder = new ElementHolder(); |
| bool wasInFunction = _inFunction; |
| _inFunction = true; |
| try { |
| _visitChildren(holder, node); |
| } finally { |
| _inFunction = wasInFunction; |
| } |
| FunctionBody body = node.body; |
| SimpleIdentifier constructorName = node.name; |
| ConstructorElementImpl element = |
| new ConstructorElementImpl.forNode(constructorName); |
| if (node.factoryKeyword != null) { |
| element.factory = true; |
| } |
| element.functions = holder.functions; |
| element.labels = holder.labels; |
| element.localVariables = holder.localVariables; |
| element.parameters = holder.parameters; |
| element.const2 = node.constKeyword != null; |
| if (body.isAsynchronous) { |
| element.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| element.generator = true; |
| } |
| _currentHolder.addConstructor(element); |
| node.element = element; |
| if (constructorName == null) { |
| Identifier returnType = node.returnType; |
| if (returnType != null) { |
| element.nameOffset = returnType.offset; |
| } |
| } else { |
| constructorName.staticElement = element; |
| } |
| holder.validate(); |
| return null; |
| } |
| |
| @override |
| Object visitDeclaredIdentifier(DeclaredIdentifier node) { |
| SimpleIdentifier variableName = node.identifier; |
| sc.Token keyword = node.keyword; |
| LocalVariableElementImpl element = |
| new LocalVariableElementImpl.forNode(variableName); |
| ForEachStatement statement = node.parent as ForEachStatement; |
| int declarationEnd = node.offset + node.length; |
| int statementEnd = statement.offset + statement.length; |
| element.setVisibleRange(declarationEnd, statementEnd - declarationEnd - 1); |
| element.const3 = _matches(keyword, sc.Keyword.CONST); |
| element.final2 = _matches(keyword, sc.Keyword.FINAL); |
| _currentHolder.addLocalVariable(element); |
| variableName.staticElement = element; |
| return super.visitDeclaredIdentifier(node); |
| } |
| |
| @override |
| Object visitDefaultFormalParameter(DefaultFormalParameter node) { |
| ElementHolder holder = new ElementHolder(); |
| NormalFormalParameter normalParameter = node.parameter; |
| SimpleIdentifier parameterName = normalParameter.identifier; |
| ParameterElementImpl parameter; |
| if (normalParameter is FieldFormalParameter) { |
| parameter = new DefaultFieldFormalParameterElementImpl(parameterName); |
| FieldElement field = |
| _fieldMap == null ? null : _fieldMap[parameterName.name]; |
| if (field != null) { |
| (parameter as DefaultFieldFormalParameterElementImpl).field = field; |
| } |
| } else { |
| parameter = new DefaultParameterElementImpl(parameterName); |
| } |
| parameter.const3 = node.isConst; |
| parameter.final2 = node.isFinal; |
| parameter.parameterKind = node.kind; |
| // set initializer, default value range |
| Expression defaultValue = node.defaultValue; |
| if (defaultValue != null) { |
| _visit(holder, defaultValue); |
| FunctionElementImpl initializer = |
| new FunctionElementImpl.forOffset(defaultValue.beginToken.offset); |
| initializer.functions = holder.functions; |
| initializer.labels = holder.labels; |
| initializer.localVariables = holder.localVariables; |
| initializer.parameters = holder.parameters; |
| initializer.synthetic = true; |
| parameter.initializer = initializer; |
| parameter.defaultValueCode = defaultValue.toSource(); |
| } |
| // visible range |
| _setParameterVisibleRange(node, parameter); |
| _currentHolder.addParameter(parameter); |
| parameterName.staticElement = parameter; |
| normalParameter.accept(this); |
| holder.validate(); |
| return null; |
| } |
| |
| @override |
| Object visitEnumDeclaration(EnumDeclaration node) { |
| SimpleIdentifier enumName = node.name; |
| ClassElementImpl enumElement = new ClassElementImpl.forNode(enumName); |
| enumElement.enum2 = true; |
| InterfaceTypeImpl enumType = new InterfaceTypeImpl.con1(enumElement); |
| enumElement.type = enumType; |
| _currentHolder.addEnum(enumElement); |
| enumName.staticElement = enumElement; |
| return super.visitEnumDeclaration(node); |
| } |
| |
| @override |
| Object visitFieldDeclaration(FieldDeclaration node) { |
| bool wasInField = _inFieldContext; |
| _inFieldContext = true; |
| try { |
| node.visitChildren(this); |
| } finally { |
| _inFieldContext = wasInField; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFieldFormalParameter(FieldFormalParameter node) { |
| if (node.parent is! DefaultFormalParameter) { |
| SimpleIdentifier parameterName = node.identifier; |
| FieldElement field = |
| _fieldMap == null ? null : _fieldMap[parameterName.name]; |
| FieldFormalParameterElementImpl parameter = |
| new FieldFormalParameterElementImpl(parameterName); |
| parameter.const3 = node.isConst; |
| parameter.final2 = node.isFinal; |
| parameter.parameterKind = node.kind; |
| if (field != null) { |
| parameter.field = field; |
| } |
| _currentHolder.addParameter(parameter); |
| parameterName.staticElement = parameter; |
| } |
| // |
| // The children of this parameter include any parameters defined on the type |
| // of this parameter. |
| // |
| ElementHolder holder = new ElementHolder(); |
| _visitChildren(holder, node); |
| (node.element as ParameterElementImpl).parameters = holder.parameters; |
| holder.validate(); |
| return null; |
| } |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) { |
| FunctionExpression expression = node.functionExpression; |
| if (expression != null) { |
| ElementHolder holder = new ElementHolder(); |
| bool wasInFunction = _inFunction; |
| _inFunction = true; |
| try { |
| _visitChildren(holder, expression); |
| } finally { |
| _inFunction = wasInFunction; |
| } |
| FunctionBody body = expression.body; |
| sc.Token property = node.propertyKeyword; |
| if (property == null || _inFunction) { |
| SimpleIdentifier functionName = node.name; |
| FunctionElementImpl element = |
| new FunctionElementImpl.forNode(functionName); |
| element.functions = holder.functions; |
| element.labels = holder.labels; |
| element.localVariables = holder.localVariables; |
| element.parameters = holder.parameters; |
| if (body.isAsynchronous) { |
| element.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| element.generator = true; |
| } |
| if (_inFunction) { |
| Block enclosingBlock = node.getAncestor((node) => node is Block); |
| if (enclosingBlock != null) { |
| int functionEnd = node.offset + node.length; |
| int blockEnd = enclosingBlock.offset + enclosingBlock.length; |
| element.setVisibleRange(functionEnd, blockEnd - functionEnd - 1); |
| } |
| } |
| _currentHolder.addFunction(element); |
| expression.element = element; |
| functionName.staticElement = element; |
| } else { |
| SimpleIdentifier propertyNameNode = node.name; |
| if (propertyNameNode == null) { |
| // TODO(brianwilkerson) Report this internal error. |
| return null; |
| } |
| String propertyName = propertyNameNode.name; |
| TopLevelVariableElementImpl variable = |
| _currentHolder.getTopLevelVariable(propertyName) as TopLevelVariableElementImpl; |
| if (variable == null) { |
| variable = new TopLevelVariableElementImpl(node.name.name, -1); |
| variable.final2 = true; |
| variable.synthetic = true; |
| _currentHolder.addTopLevelVariable(variable); |
| } |
| if (_matches(property, sc.Keyword.GET)) { |
| PropertyAccessorElementImpl getter = |
| new PropertyAccessorElementImpl.forNode(propertyNameNode); |
| getter.functions = holder.functions; |
| getter.labels = holder.labels; |
| getter.localVariables = holder.localVariables; |
| if (body.isAsynchronous) { |
| getter.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| getter.generator = true; |
| } |
| getter.variable = variable; |
| getter.getter = true; |
| getter.static = true; |
| variable.getter = getter; |
| _currentHolder.addAccessor(getter); |
| expression.element = getter; |
| propertyNameNode.staticElement = getter; |
| } else { |
| PropertyAccessorElementImpl setter = |
| new PropertyAccessorElementImpl.forNode(propertyNameNode); |
| setter.functions = holder.functions; |
| setter.labels = holder.labels; |
| setter.localVariables = holder.localVariables; |
| setter.parameters = holder.parameters; |
| if (body.isAsynchronous) { |
| setter.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| setter.generator = true; |
| } |
| setter.variable = variable; |
| setter.setter = true; |
| setter.static = true; |
| variable.setter = setter; |
| variable.final2 = false; |
| _currentHolder.addAccessor(setter); |
| expression.element = setter; |
| propertyNameNode.staticElement = setter; |
| } |
| } |
| holder.validate(); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFunctionExpression(FunctionExpression node) { |
| ElementHolder holder = new ElementHolder(); |
| bool wasInFunction = _inFunction; |
| _inFunction = true; |
| try { |
| _visitChildren(holder, node); |
| } finally { |
| _inFunction = wasInFunction; |
| } |
| FunctionBody body = node.body; |
| FunctionElementImpl element = |
| new FunctionElementImpl.forOffset(node.beginToken.offset); |
| element.functions = holder.functions; |
| element.labels = holder.labels; |
| element.localVariables = holder.localVariables; |
| element.parameters = holder.parameters; |
| if (body.isAsynchronous) { |
| element.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| element.generator = true; |
| } |
| if (_inFunction) { |
| Block enclosingBlock = node.getAncestor((node) => node is Block); |
| if (enclosingBlock != null) { |
| int functionEnd = node.offset + node.length; |
| int blockEnd = enclosingBlock.offset + enclosingBlock.length; |
| element.setVisibleRange(functionEnd, blockEnd - functionEnd - 1); |
| } |
| } |
| FunctionTypeImpl type = new FunctionTypeImpl.con1(element); |
| if (_functionTypesToFix != null) { |
| _functionTypesToFix.add(type); |
| } |
| element.type = type; |
| _currentHolder.addFunction(element); |
| node.element = element; |
| holder.validate(); |
| return null; |
| } |
| |
| @override |
| Object visitFunctionTypeAlias(FunctionTypeAlias node) { |
| ElementHolder holder = new ElementHolder(); |
| _visitChildren(holder, node); |
| SimpleIdentifier aliasName = node.name; |
| List<ParameterElement> parameters = holder.parameters; |
| List<TypeParameterElement> typeParameters = holder.typeParameters; |
| FunctionTypeAliasElementImpl element = |
| new FunctionTypeAliasElementImpl.forNode(aliasName); |
| element.parameters = parameters; |
| element.typeParameters = typeParameters; |
| FunctionTypeImpl type = new FunctionTypeImpl.con2(element); |
| type.typeArguments = _createTypeParameterTypes(typeParameters); |
| element.type = type; |
| _currentHolder.addTypeAlias(element); |
| aliasName.staticElement = element; |
| holder.validate(); |
| return null; |
| } |
| |
| @override |
| Object visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) { |
| if (node.parent is! DefaultFormalParameter) { |
| SimpleIdentifier parameterName = node.identifier; |
| ParameterElementImpl parameter = |
| new ParameterElementImpl.forNode(parameterName); |
| parameter.parameterKind = node.kind; |
| _setParameterVisibleRange(node, parameter); |
| _currentHolder.addParameter(parameter); |
| parameterName.staticElement = parameter; |
| } |
| // |
| // The children of this parameter include any parameters defined on the type |
| //of this parameter. |
| // |
| ElementHolder holder = new ElementHolder(); |
| _visitChildren(holder, node); |
| (node.element as ParameterElementImpl).parameters = holder.parameters; |
| holder.validate(); |
| return null; |
| } |
| |
| @override |
| Object visitLabeledStatement(LabeledStatement node) { |
| bool onSwitchStatement = node.statement is SwitchStatement; |
| for (Label label in node.labels) { |
| SimpleIdentifier labelName = label.label; |
| LabelElementImpl element = |
| new LabelElementImpl(labelName, onSwitchStatement, false); |
| _currentHolder.addLabel(element); |
| labelName.staticElement = element; |
| } |
| return super.visitLabeledStatement(node); |
| } |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| try { |
| ElementHolder holder = new ElementHolder(); |
| bool wasInFunction = _inFunction; |
| _inFunction = true; |
| try { |
| _visitChildren(holder, node); |
| } finally { |
| _inFunction = wasInFunction; |
| } |
| bool isStatic = node.isStatic; |
| sc.Token property = node.propertyKeyword; |
| FunctionBody body = node.body; |
| if (property == null) { |
| SimpleIdentifier methodName = node.name; |
| String nameOfMethod = methodName.name; |
| if (nameOfMethod == sc.TokenType.MINUS.lexeme && |
| node.parameters.parameters.length == 0) { |
| nameOfMethod = "unary-"; |
| } |
| MethodElementImpl element = |
| new MethodElementImpl(nameOfMethod, methodName.offset); |
| element.abstract = node.isAbstract; |
| element.functions = holder.functions; |
| element.labels = holder.labels; |
| element.localVariables = holder.localVariables; |
| element.parameters = holder.parameters; |
| element.static = isStatic; |
| if (body.isAsynchronous) { |
| element.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| element.generator = true; |
| } |
| _currentHolder.addMethod(element); |
| methodName.staticElement = element; |
| } else { |
| SimpleIdentifier propertyNameNode = node.name; |
| String propertyName = propertyNameNode.name; |
| FieldElementImpl field = |
| _currentHolder.getField(propertyName) as FieldElementImpl; |
| if (field == null) { |
| field = new FieldElementImpl(node.name.name, -1); |
| field.final2 = true; |
| field.static = isStatic; |
| field.synthetic = true; |
| _currentHolder.addField(field); |
| } |
| if (_matches(property, sc.Keyword.GET)) { |
| PropertyAccessorElementImpl getter = |
| new PropertyAccessorElementImpl.forNode(propertyNameNode); |
| getter.functions = holder.functions; |
| getter.labels = holder.labels; |
| getter.localVariables = holder.localVariables; |
| if (body.isAsynchronous) { |
| getter.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| getter.generator = true; |
| } |
| getter.variable = field; |
| getter.abstract = |
| body is EmptyFunctionBody && node.externalKeyword == null; |
| getter.getter = true; |
| getter.static = isStatic; |
| field.getter = getter; |
| _currentHolder.addAccessor(getter); |
| propertyNameNode.staticElement = getter; |
| } else { |
| PropertyAccessorElementImpl setter = |
| new PropertyAccessorElementImpl.forNode(propertyNameNode); |
| setter.functions = holder.functions; |
| setter.labels = holder.labels; |
| setter.localVariables = holder.localVariables; |
| setter.parameters = holder.parameters; |
| if (body.isAsynchronous) { |
| setter.asynchronous = true; |
| } |
| if (body.isGenerator) { |
| setter.generator = true; |
| } |
| setter.variable = field; |
| setter.abstract = body is EmptyFunctionBody && |
| !_matches(node.externalKeyword, sc.Keyword.EXTERNAL); |
| setter.setter = true; |
| setter.static = isStatic; |
| field.setter = setter; |
| field.final2 = false; |
| _currentHolder.addAccessor(setter); |
| propertyNameNode.staticElement = setter; |
| } |
| } |
| holder.validate(); |
| } catch (exception, stackTrace) { |
| if (node.name.staticElement == null) { |
| ClassDeclaration classNode = |
| node.getAncestor((node) => node is ClassDeclaration); |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("The element for the method "); |
| buffer.write(node.name); |
| buffer.write(" in "); |
| buffer.write(classNode.name); |
| buffer.write(" was not set while trying to build the element model."); |
| AnalysisEngine.instance.logger.logError( |
| buffer.toString(), |
| new CaughtException(exception, stackTrace)); |
| } else { |
| String message = |
| "Exception caught in ElementBuilder.visitMethodDeclaration()"; |
| AnalysisEngine.instance.logger.logError( |
| message, |
| new CaughtException(exception, stackTrace)); |
| } |
| } finally { |
| if (node.name.staticElement == null) { |
| ClassDeclaration classNode = |
| node.getAncestor((node) => node is ClassDeclaration); |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("The element for the method "); |
| buffer.write(node.name); |
| buffer.write(" in "); |
| buffer.write(classNode.name); |
| buffer.write(" was not set while trying to resolve types."); |
| AnalysisEngine.instance.logger.logError( |
| buffer.toString(), |
| new CaughtException(new AnalysisException(buffer.toString()), null)); |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitSimpleFormalParameter(SimpleFormalParameter node) { |
| if (node.parent is! DefaultFormalParameter) { |
| SimpleIdentifier parameterName = node.identifier; |
| ParameterElementImpl parameter = |
| new ParameterElementImpl.forNode(parameterName); |
| parameter.const3 = node.isConst; |
| parameter.final2 = node.isFinal; |
| parameter.parameterKind = node.kind; |
| _setParameterVisibleRange(node, parameter); |
| _currentHolder.addParameter(parameter); |
| parameterName.staticElement = parameter; |
| } |
| return super.visitSimpleFormalParameter(node); |
| } |
| |
| @override |
| Object visitSuperExpression(SuperExpression node) { |
| _isValidMixin = false; |
| return super.visitSuperExpression(node); |
| } |
| |
| @override |
| Object visitSwitchCase(SwitchCase node) { |
| for (Label label in node.labels) { |
| SimpleIdentifier labelName = label.label; |
| LabelElementImpl element = new LabelElementImpl(labelName, false, true); |
| _currentHolder.addLabel(element); |
| labelName.staticElement = element; |
| } |
| return super.visitSwitchCase(node); |
| } |
| |
| @override |
| Object visitSwitchDefault(SwitchDefault node) { |
| for (Label label in node.labels) { |
| SimpleIdentifier labelName = label.label; |
| LabelElementImpl element = new LabelElementImpl(labelName, false, true); |
| _currentHolder.addLabel(element); |
| labelName.staticElement = element; |
| } |
| return super.visitSwitchDefault(node); |
| } |
| |
| @override |
| Object visitTypeParameter(TypeParameter node) { |
| SimpleIdentifier parameterName = node.name; |
| TypeParameterElementImpl typeParameter = |
| new TypeParameterElementImpl.forNode(parameterName); |
| TypeParameterTypeImpl typeParameterType = |
| new TypeParameterTypeImpl(typeParameter); |
| typeParameter.type = typeParameterType; |
| _currentHolder.addTypeParameter(typeParameter); |
| parameterName.staticElement = typeParameter; |
| return super.visitTypeParameter(node); |
| } |
| |
| @override |
| Object visitVariableDeclaration(VariableDeclaration node) { |
| sc.Token keyword = (node.parent as VariableDeclarationList).keyword; |
| bool isConst = _matches(keyword, sc.Keyword.CONST); |
| bool isFinal = _matches(keyword, sc.Keyword.FINAL); |
| bool hasInitializer = node.initializer != null; |
| VariableElementImpl element; |
| if (_inFieldContext) { |
| SimpleIdentifier fieldName = node.name; |
| FieldElementImpl field; |
| if (isConst && hasInitializer) { |
| field = new ConstFieldElementImpl.con1(fieldName); |
| } else { |
| field = new FieldElementImpl.forNode(fieldName); |
| } |
| element = field; |
| _currentHolder.addField(field); |
| fieldName.staticElement = field; |
| } else if (_inFunction) { |
| SimpleIdentifier variableName = node.name; |
| LocalVariableElementImpl variable; |
| if (isConst && hasInitializer) { |
| variable = new ConstLocalVariableElementImpl(variableName); |
| } else { |
| variable = new LocalVariableElementImpl.forNode(variableName); |
| } |
| element = variable; |
| Block enclosingBlock = node.getAncestor((node) => node is Block); |
| int functionEnd = node.offset + node.length; |
| int blockEnd = enclosingBlock.offset + enclosingBlock.length; |
| // TODO(brianwilkerson) This isn't right for variables declared in a for |
| // loop. |
| variable.setVisibleRange(functionEnd, blockEnd - functionEnd - 1); |
| _currentHolder.addLocalVariable(variable); |
| variableName.staticElement = element; |
| } else { |
| SimpleIdentifier variableName = node.name; |
| TopLevelVariableElementImpl variable; |
| if (isConst && hasInitializer) { |
| variable = new ConstTopLevelVariableElementImpl(variableName); |
| } else { |
| variable = new TopLevelVariableElementImpl.forNode(variableName); |
| } |
| element = variable; |
| _currentHolder.addTopLevelVariable(variable); |
| variableName.staticElement = element; |
| } |
| element.const3 = isConst; |
| element.final2 = isFinal; |
| if (hasInitializer) { |
| ElementHolder holder = new ElementHolder(); |
| bool wasInFieldContext = _inFieldContext; |
| _inFieldContext = false; |
| try { |
| _visit(holder, node.initializer); |
| } finally { |
| _inFieldContext = wasInFieldContext; |
| } |
| FunctionElementImpl initializer = |
| new FunctionElementImpl.forOffset(node.initializer.beginToken.offset); |
| initializer.functions = holder.functions; |
| initializer.labels = holder.labels; |
| initializer.localVariables = holder.localVariables; |
| initializer.synthetic = true; |
| element.initializer = initializer; |
| holder.validate(); |
| } |
| if (element is PropertyInducingElementImpl) { |
| PropertyInducingElementImpl variable = |
| element as PropertyInducingElementImpl; |
| if (_inFieldContext) { |
| (variable as FieldElementImpl).static = _matches( |
| (node.parent.parent as FieldDeclaration).staticKeyword, |
| sc.Keyword.STATIC); |
| } |
| PropertyAccessorElementImpl getter = |
| new PropertyAccessorElementImpl.forVariable(variable); |
| getter.getter = true; |
| _currentHolder.addAccessor(getter); |
| variable.getter = getter; |
| if (!isFinal) { |
| PropertyAccessorElementImpl setter = |
| new PropertyAccessorElementImpl.forVariable(variable); |
| setter.setter = true; |
| ParameterElementImpl parameter = |
| new ParameterElementImpl("_${variable.name}", variable.nameOffset); |
| parameter.synthetic = true; |
| parameter.parameterKind = ParameterKind.REQUIRED; |
| setter.parameters = <ParameterElement>[parameter]; |
| _currentHolder.addAccessor(setter); |
| variable.setter = setter; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Build the table mapping field names to field elements for the fields defined in the current |
| * class. |
| * |
| * @param fields the field elements defined in the current class |
| */ |
| void _buildFieldMap(List<FieldElement> fields) { |
| _fieldMap = new HashMap<String, FieldElement>(); |
| int count = fields.length; |
| for (int i = 0; i < count; i++) { |
| FieldElement field = fields[i]; |
| _fieldMap[field.name] = field; |
| } |
| } |
| |
| /** |
| * Creates the [ConstructorElement]s array with the single default constructor element. |
| * |
| * @param interfaceType the interface type for which to create a default constructor |
| * @return the [ConstructorElement]s array with the single default constructor element |
| */ |
| List<ConstructorElement> |
| _createDefaultConstructors(InterfaceTypeImpl interfaceType) { |
| ConstructorElementImpl constructor = |
| new ConstructorElementImpl.forNode(null); |
| constructor.synthetic = true; |
| constructor.returnType = interfaceType; |
| FunctionTypeImpl type = new FunctionTypeImpl.con1(constructor); |
| _functionTypesToFix.add(type); |
| constructor.type = type; |
| return <ConstructorElement>[constructor]; |
| } |
| |
| /** |
| * Create the types associated with the given type parameters, setting the type of each type |
| * parameter, and return an array of types corresponding to the given parameters. |
| * |
| * @param typeParameters the type parameters for which types are to be created |
| * @return an array of types corresponding to the given parameters |
| */ |
| List<DartType> |
| _createTypeParameterTypes(List<TypeParameterElement> typeParameters) { |
| int typeParameterCount = typeParameters.length; |
| List<DartType> typeArguments = new List<DartType>(typeParameterCount); |
| for (int i = 0; i < typeParameterCount; i++) { |
| TypeParameterElementImpl typeParameter = |
| typeParameters[i] as TypeParameterElementImpl; |
| TypeParameterTypeImpl typeParameterType = |
| new TypeParameterTypeImpl(typeParameter); |
| typeParameter.type = typeParameterType; |
| typeArguments[i] = typeParameterType; |
| } |
| return typeArguments; |
| } |
| |
| /** |
| * Return the body of the function that contains the given parameter, or `null` if no |
| * function body could be found. |
| * |
| * @param node the parameter contained in the function whose body is to be returned |
| * @return the body of the function that contains the given parameter |
| */ |
| FunctionBody _getFunctionBody(FormalParameter node) { |
| AstNode parent = node.parent; |
| while (parent != null) { |
| if (parent is ConstructorDeclaration) { |
| return (parent as ConstructorDeclaration).body; |
| } else if (parent is FunctionExpression) { |
| return (parent as FunctionExpression).body; |
| } else if (parent is MethodDeclaration) { |
| return (parent as MethodDeclaration).body; |
| } |
| parent = parent.parent; |
| } |
| return null; |
| } |
| |
| /** |
| * Return `true` if the given token is a token for the given keyword. |
| * |
| * @param token the token being tested |
| * @param keyword the keyword being tested for |
| * @return `true` if the given token is a token for the given keyword |
| */ |
| bool _matches(sc.Token token, sc.Keyword keyword) => |
| token != null && |
| token.type == sc.TokenType.KEYWORD && |
| (token as sc.KeywordToken).keyword == keyword; |
| |
| /** |
| * Sets the visible source range for formal parameter. |
| */ |
| void _setParameterVisibleRange(FormalParameter node, |
| ParameterElementImpl element) { |
| FunctionBody body = _getFunctionBody(node); |
| if (body != null) { |
| element.setVisibleRange(body.offset, body.length); |
| } |
| } |
| |
| /** |
| * Make the given holder be the current holder while visiting the given node. |
| * |
| * @param holder the holder that will gather elements that are built while visiting the children |
| * @param node the node to be visited |
| */ |
| void _visit(ElementHolder holder, AstNode node) { |
| if (node != null) { |
| ElementHolder previousHolder = _currentHolder; |
| _currentHolder = holder; |
| try { |
| node.accept(this); |
| } finally { |
| _currentHolder = previousHolder; |
| } |
| } |
| } |
| |
| /** |
| * Make the given holder be the current holder while visiting the children of the given node. |
| * |
| * @param holder the holder that will gather elements that are built while visiting the children |
| * @param node the node whose children are to be visited |
| */ |
| void _visitChildren(ElementHolder holder, AstNode node) { |
| if (node != null) { |
| ElementHolder previousHolder = _currentHolder; |
| _currentHolder = holder; |
| try { |
| node.visitChildren(this); |
| } finally { |
| _currentHolder = previousHolder; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `ElementHolder` hold on to elements created while traversing an AST |
| * structure so that they can be accessed when creating their enclosing element. |
| */ |
| class ElementHolder { |
| List<PropertyAccessorElement> _accessors; |
| |
| List<ConstructorElement> _constructors; |
| |
| List<ClassElement> _enums; |
| |
| List<FieldElement> _fields; |
| |
| List<FunctionElement> _functions; |
| |
| List<LabelElement> _labels; |
| |
| List<LocalVariableElement> _localVariables; |
| |
| List<MethodElement> _methods; |
| |
| List<ParameterElement> _parameters; |
| |
| List<TopLevelVariableElement> _topLevelVariables; |
| |
| List<ClassElement> _types; |
| |
| List<FunctionTypeAliasElement> _typeAliases; |
| |
| List<TypeParameterElement> _typeParameters; |
| |
| List<PropertyAccessorElement> get accessors { |
| if (_accessors == null) { |
| return PropertyAccessorElementImpl.EMPTY_ARRAY; |
| } |
| List<PropertyAccessorElement> result = _accessors; |
| _accessors = null; |
| return result; |
| } |
| |
| List<ConstructorElement> get constructors { |
| if (_constructors == null) { |
| return ConstructorElementImpl.EMPTY_ARRAY; |
| } |
| List<ConstructorElement> result = _constructors; |
| _constructors = null; |
| return result; |
| } |
| |
| List<ClassElement> get enums { |
| if (_enums == null) { |
| return ClassElementImpl.EMPTY_ARRAY; |
| } |
| List<ClassElement> result = _enums; |
| _enums = null; |
| return result; |
| } |
| |
| List<FieldElement> get fields { |
| if (_fields == null) { |
| return FieldElementImpl.EMPTY_ARRAY; |
| } |
| List<FieldElement> result = _fields; |
| _fields = null; |
| return result; |
| } |
| |
| List<FieldElement> get fieldsWithoutFlushing { |
| if (_fields == null) { |
| return FieldElementImpl.EMPTY_ARRAY; |
| } |
| List<FieldElement> result = _fields; |
| return result; |
| } |
| |
| List<FunctionElement> get functions { |
| if (_functions == null) { |
| return FunctionElementImpl.EMPTY_ARRAY; |
| } |
| List<FunctionElement> result = _functions; |
| _functions = null; |
| return result; |
| } |
| |
| List<LabelElement> get labels { |
| if (_labels == null) { |
| return LabelElementImpl.EMPTY_ARRAY; |
| } |
| List<LabelElement> result = _labels; |
| _labels = null; |
| return result; |
| } |
| |
| List<LocalVariableElement> get localVariables { |
| if (_localVariables == null) { |
| return LocalVariableElementImpl.EMPTY_ARRAY; |
| } |
| List<LocalVariableElement> result = _localVariables; |
| _localVariables = null; |
| return result; |
| } |
| |
| List<MethodElement> get methods { |
| if (_methods == null) { |
| return MethodElementImpl.EMPTY_ARRAY; |
| } |
| List<MethodElement> result = _methods; |
| _methods = null; |
| return result; |
| } |
| |
| List<ParameterElement> get parameters { |
| if (_parameters == null) { |
| return ParameterElementImpl.EMPTY_ARRAY; |
| } |
| List<ParameterElement> result = _parameters; |
| _parameters = null; |
| return result; |
| } |
| |
| List<TopLevelVariableElement> get topLevelVariables { |
| if (_topLevelVariables == null) { |
| return TopLevelVariableElementImpl.EMPTY_ARRAY; |
| } |
| List<TopLevelVariableElement> result = _topLevelVariables; |
| _topLevelVariables = null; |
| return result; |
| } |
| |
| List<FunctionTypeAliasElement> get typeAliases { |
| if (_typeAliases == null) { |
| return FunctionTypeAliasElementImpl.EMPTY_ARRAY; |
| } |
| List<FunctionTypeAliasElement> result = _typeAliases; |
| _typeAliases = null; |
| return result; |
| } |
| |
| List<TypeParameterElement> get typeParameters { |
| if (_typeParameters == null) { |
| return TypeParameterElementImpl.EMPTY_ARRAY; |
| } |
| List<TypeParameterElement> result = _typeParameters; |
| _typeParameters = null; |
| return result; |
| } |
| |
| List<ClassElement> get types { |
| if (_types == null) { |
| return ClassElementImpl.EMPTY_ARRAY; |
| } |
| List<ClassElement> result = _types; |
| _types = null; |
| return result; |
| } |
| |
| void addAccessor(PropertyAccessorElement element) { |
| if (_accessors == null) { |
| _accessors = new List<PropertyAccessorElement>(); |
| } |
| _accessors.add(element); |
| } |
| |
| void addConstructor(ConstructorElement element) { |
| if (_constructors == null) { |
| _constructors = new List<ConstructorElement>(); |
| } |
| _constructors.add(element); |
| } |
| |
| void addEnum(ClassElement element) { |
| if (_enums == null) { |
| _enums = new List<ClassElement>(); |
| } |
| _enums.add(element); |
| } |
| |
| void addField(FieldElement element) { |
| if (_fields == null) { |
| _fields = new List<FieldElement>(); |
| } |
| _fields.add(element); |
| } |
| |
| void addFunction(FunctionElement element) { |
| if (_functions == null) { |
| _functions = new List<FunctionElement>(); |
| } |
| _functions.add(element); |
| } |
| |
| void addLabel(LabelElement element) { |
| if (_labels == null) { |
| _labels = new List<LabelElement>(); |
| } |
| _labels.add(element); |
| } |
| |
| void addLocalVariable(LocalVariableElement element) { |
| if (_localVariables == null) { |
| _localVariables = new List<LocalVariableElement>(); |
| } |
| _localVariables.add(element); |
| } |
| |
| void addMethod(MethodElement element) { |
| if (_methods == null) { |
| _methods = new List<MethodElement>(); |
| } |
| _methods.add(element); |
| } |
| |
| void addParameter(ParameterElement element) { |
| if (_parameters == null) { |
| _parameters = new List<ParameterElement>(); |
| } |
| _parameters.add(element); |
| } |
| |
| void addTopLevelVariable(TopLevelVariableElement element) { |
| if (_topLevelVariables == null) { |
| _topLevelVariables = new List<TopLevelVariableElement>(); |
| } |
| _topLevelVariables.add(element); |
| } |
| |
| void addType(ClassElement element) { |
| if (_types == null) { |
| _types = new List<ClassElement>(); |
| } |
| _types.add(element); |
| } |
| |
| void addTypeAlias(FunctionTypeAliasElement element) { |
| if (_typeAliases == null) { |
| _typeAliases = new List<FunctionTypeAliasElement>(); |
| } |
| _typeAliases.add(element); |
| } |
| |
| void addTypeParameter(TypeParameterElement element) { |
| if (_typeParameters == null) { |
| _typeParameters = new List<TypeParameterElement>(); |
| } |
| _typeParameters.add(element); |
| } |
| |
| FieldElement getField(String fieldName) { |
| if (_fields == null) { |
| return null; |
| } |
| for (FieldElement field in _fields) { |
| if (field.name == fieldName) { |
| return field; |
| } |
| } |
| return null; |
| } |
| |
| TopLevelVariableElement getTopLevelVariable(String variableName) { |
| if (_topLevelVariables == null) { |
| return null; |
| } |
| for (TopLevelVariableElement variable in _topLevelVariables) { |
| if (variable.name == variableName) { |
| return variable; |
| } |
| } |
| return null; |
| } |
| |
| void validate() { |
| StringBuffer buffer = new StringBuffer(); |
| if (_accessors != null) { |
| buffer.write(_accessors.length); |
| buffer.write(" accessors"); |
| } |
| if (_constructors != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_constructors.length); |
| buffer.write(" constructors"); |
| } |
| if (_fields != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_fields.length); |
| buffer.write(" fields"); |
| } |
| if (_functions != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_functions.length); |
| buffer.write(" functions"); |
| } |
| if (_labels != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_labels.length); |
| buffer.write(" labels"); |
| } |
| if (_localVariables != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_localVariables.length); |
| buffer.write(" local variables"); |
| } |
| if (_methods != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_methods.length); |
| buffer.write(" methods"); |
| } |
| if (_parameters != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_parameters.length); |
| buffer.write(" parameters"); |
| } |
| if (_topLevelVariables != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_topLevelVariables.length); |
| buffer.write(" top-level variables"); |
| } |
| if (_types != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_types.length); |
| buffer.write(" types"); |
| } |
| if (_typeAliases != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_typeAliases.length); |
| buffer.write(" type aliases"); |
| } |
| if (_typeParameters != null) { |
| if (buffer.length > 0) { |
| buffer.write("; "); |
| } |
| buffer.write(_typeParameters.length); |
| buffer.write(" type parameters"); |
| } |
| if (buffer.length > 0) { |
| AnalysisEngine.instance.logger.logError( |
| "Failed to capture elements: $buffer"); |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `EnclosedScope` implement a scope that is lexically enclosed in |
| * another scope. |
| */ |
| class EnclosedScope extends Scope { |
| /** |
| * The scope in which this scope is lexically enclosed. |
| */ |
| final Scope enclosingScope; |
| |
| /** |
| * A table mapping names that will be defined in this scope, but right now are not initialized. |
| * According to the scoping rules these names are hidden, even if they were defined in an outer |
| * scope. |
| */ |
| HashMap<String, Element> _hiddenElements = new HashMap<String, Element>(); |
| |
| /** |
| * A flag indicating whether there are any names defined in this scope. |
| */ |
| bool _hasHiddenName = false; |
| |
| /** |
| * Initialize a newly created scope enclosed within another scope. |
| * |
| * @param enclosingScope the scope in which this scope is lexically enclosed |
| */ |
| EnclosedScope(this.enclosingScope); |
| |
| @override |
| AnalysisErrorListener get errorListener => enclosingScope.errorListener; |
| |
| /** |
| * Record that given element is declared in this scope, but hasn't been initialized yet, so it is |
| * error to use. If there is already an element with the given name defined in an outer scope, |
| * then it will become unavailable. |
| * |
| * @param element the element declared, but not initialized in this scope |
| */ |
| void hide(Element element) { |
| if (element != null) { |
| String name = element.name; |
| if (name != null && !name.isEmpty) { |
| _hiddenElements[name] = element; |
| _hasHiddenName = true; |
| } |
| } |
| } |
| |
| @override |
| Element internalLookup(Identifier identifier, String name, |
| LibraryElement referencingLibrary) { |
| Element element = localLookup(name, referencingLibrary); |
| if (element != null) { |
| return element; |
| } |
| // May be there is a hidden Element. |
| if (_hasHiddenName) { |
| Element hiddenElement = _hiddenElements[name]; |
| if (hiddenElement != null) { |
| errorListener.onError( |
| new AnalysisError.con2( |
| getSource(identifier), |
| identifier.offset, |
| identifier.length, |
| CompileTimeErrorCode.REFERENCED_BEFORE_DECLARATION, |
| [])); |
| return hiddenElement; |
| } |
| } |
| // Check enclosing scope. |
| return enclosingScope.internalLookup(identifier, name, referencingLibrary); |
| } |
| } |
| |
| /** |
| * Instances of the class `EnumMemberBuilder` build the members in enum declarations. |
| */ |
| class EnumMemberBuilder extends RecursiveAstVisitor<Object> { |
| /** |
| * The type provider used to access the types needed to build an element model for enum |
| * declarations. |
| */ |
| final TypeProvider _typeProvider; |
| |
| /** |
| * Initialize a newly created enum member builder. |
| * |
| * @param typeProvider the type provider used to access the types needed to build an element model |
| * for enum declarations |
| */ |
| EnumMemberBuilder(this._typeProvider); |
| |
| @override |
| Object visitEnumDeclaration(EnumDeclaration node) { |
| // |
| // Finish building the enum. |
| // |
| ClassElementImpl enumElement = node.name.staticElement as ClassElementImpl; |
| InterfaceType enumType = enumElement.type; |
| enumElement.supertype = _typeProvider.objectType; |
| // |
| // Populate the fields. |
| // |
| List<FieldElement> fields = new List<FieldElement>(); |
| List<PropertyAccessorElement> getters = new List<PropertyAccessorElement>(); |
| InterfaceType intType = _typeProvider.intType; |
| String indexFieldName = "index"; |
| FieldElementImpl indexField = new FieldElementImpl(indexFieldName, -1); |
| indexField.final2 = true; |
| indexField.synthetic = true; |
| indexField.type = intType; |
| fields.add(indexField); |
| getters.add(_createGetter(indexField)); |
| FieldElementImpl valuesField = new FieldElementImpl("values", -1); |
| valuesField.static = true; |
| valuesField.const3 = true; |
| valuesField.synthetic = true; |
| valuesField.type = _typeProvider.listType.substitute4(<DartType>[enumType]); |
| fields.add(valuesField); |
| getters.add(_createGetter(valuesField)); |
| // |
| // Build the enum constants. |
| // |
| NodeList<EnumConstantDeclaration> constants = node.constants; |
| int constantCount = constants.length; |
| for (int i = 0; i < constantCount; i++) { |
| SimpleIdentifier constantName = constants[i].name; |
| FieldElementImpl constantField = |
| new ConstFieldElementImpl.con1(constantName); |
| constantField.static = true; |
| constantField.const3 = true; |
| constantField.type = enumType; |
| // |
| // Create a value for the constant. |
| // |
| HashMap<String, DartObjectImpl> fieldMap = |
| new HashMap<String, DartObjectImpl>(); |
| fieldMap[indexFieldName] = new DartObjectImpl(intType, new IntState(i)); |
| DartObjectImpl value = |
| new DartObjectImpl(enumType, new GenericState(fieldMap)); |
| constantField.evaluationResult = new EvaluationResultImpl.con1(value); |
| fields.add(constantField); |
| getters.add(_createGetter(constantField)); |
| constantName.staticElement = constantField; |
| } |
| // |
| // Finish building the enum. |
| // |
| enumElement.fields = fields; |
| enumElement.accessors = getters; |
| // Client code isn't allowed to invoke the constructor, so we do not model |
| // it. |
| return super.visitEnumDeclaration(node); |
| } |
| |
| /** |
| * Create a getter that corresponds to the given field. |
| * |
| * @param field the field for which a getter is to be created |
| * @return the getter that was created |
| */ |
| PropertyAccessorElement _createGetter(FieldElementImpl field) { |
| PropertyAccessorElementImpl getter = |
| new PropertyAccessorElementImpl.forVariable(field); |
| getter.getter = true; |
| getter.returnType = field.type; |
| getter.type = new FunctionTypeImpl.con1(getter); |
| field.getter = getter; |
| return getter; |
| } |
| } |
| |
| /** |
| * Instances of the class `ExitDetector` determine whether the visited AST node is guaranteed |
| * to terminate by executing a `return` statement, `throw` expression, `rethrow` |
| * expression, or simple infinite loop such as `while(true)`. |
| */ |
| class ExitDetector extends GeneralizingAstVisitor<bool> { |
| /** |
| * Set to `true` when a `break` is encountered, and reset to `false` when a |
| * `do`, `while`, `for` or `switch` block is entered. |
| */ |
| bool _enclosingBlockContainsBreak = false; |
| |
| @override |
| bool visitArgumentList(ArgumentList node) => |
| _visitExpressions(node.arguments); |
| |
| @override |
| bool visitAsExpression(AsExpression node) => _nodeExits(node.expression); |
| |
| @override |
| bool visitAssertStatement(AssertStatement node) => _nodeExits(node.condition); |
| |
| @override |
| bool visitAssignmentExpression(AssignmentExpression node) => |
| _nodeExits(node.leftHandSide) || _nodeExits(node.rightHandSide); |
| |
| @override |
| bool visitBinaryExpression(BinaryExpression node) { |
| Expression lhsExpression = node.leftOperand; |
| sc.TokenType operatorType = node.operator.type; |
| // If the operator is || and the left hand side is false literal, don't |
| // consider the RHS of the binary expression. |
| // TODO(jwren) Do we want to take constant expressions into account, |
| // evaluate if(false) {} differently than if(<condition>), when <condition> |
| // evaluates to a constant false value? |
| if (operatorType == sc.TokenType.BAR_BAR) { |
| if (lhsExpression is BooleanLiteral) { |
| BooleanLiteral booleanLiteral = lhsExpression; |
| if (!booleanLiteral.value) { |
| return false; |
| } |
| } |
| } |
| // If the operator is && and the left hand side is true literal, don't |
| // consider the RHS of the binary expression. |
| if (operatorType == sc.TokenType.AMPERSAND_AMPERSAND) { |
| if (lhsExpression is BooleanLiteral) { |
| BooleanLiteral booleanLiteral = lhsExpression; |
| if (booleanLiteral.value) { |
| return false; |
| } |
| } |
| } |
| Expression rhsExpression = node.rightOperand; |
| return _nodeExits(lhsExpression) || _nodeExits(rhsExpression); |
| } |
| |
| @override |
| bool visitBlock(Block node) => _visitStatements(node.statements); |
| |
| @override |
| bool visitBlockFunctionBody(BlockFunctionBody node) => _nodeExits(node.block); |
| |
| @override |
| bool visitBreakStatement(BreakStatement node) { |
| _enclosingBlockContainsBreak = true; |
| return false; |
| } |
| |
| @override |
| bool visitCascadeExpression(CascadeExpression node) => |
| _nodeExits(node.target) || _visitExpressions(node.cascadeSections); |
| |
| @override |
| bool visitConditionalExpression(ConditionalExpression node) { |
| Expression conditionExpression = node.condition; |
| Expression thenStatement = node.thenExpression; |
| Expression elseStatement = node.elseExpression; |
| // TODO(jwren) Do we want to take constant expressions into account, |
| // evaluate if(false) {} differently than if(<condition>), when <condition> |
| // evaluates to a constant false value? |
| if (_nodeExits(conditionExpression)) { |
| return true; |
| } |
| if (thenStatement == null || elseStatement == null) { |
| return false; |
| } |
| return thenStatement.accept(this) && elseStatement.accept(this); |
| } |
| |
| @override |
| bool visitContinueStatement(ContinueStatement node) => false; |
| |
| @override |
| bool visitDoStatement(DoStatement node) { |
| bool outerBreakValue = _enclosingBlockContainsBreak; |
| _enclosingBlockContainsBreak = false; |
| try { |
| Expression conditionExpression = node.condition; |
| if (_nodeExits(conditionExpression)) { |
| return true; |
| } |
| // TODO(jwren) Do we want to take all constant expressions into account? |
| if (conditionExpression is BooleanLiteral) { |
| BooleanLiteral booleanLiteral = conditionExpression; |
| // If do {} while (true), and the body doesn't return or the body |
| // doesn't have a break, then return true. |
| bool blockReturns = _nodeExits(node.body); |
| if (booleanLiteral.value && |
| (blockReturns || !_enclosingBlockContainsBreak)) { |
| return true; |
| } |
| } |
| return false; |
| } finally { |
| _enclosingBlockContainsBreak = outerBreakValue; |
| } |
| } |
| |
| @override |
| bool visitEmptyStatement(EmptyStatement node) => false; |
| |
| @override |
| bool visitExpressionStatement(ExpressionStatement node) => |
| _nodeExits(node.expression); |
| |
| @override |
| bool visitForEachStatement(ForEachStatement node) { |
| bool outerBreakValue = _enclosingBlockContainsBreak; |
| _enclosingBlockContainsBreak = false; |
| try { |
| return _nodeExits(node.iterable); |
| } finally { |
| _enclosingBlockContainsBreak = outerBreakValue; |
| } |
| } |
| |
| @override |
| bool visitForStatement(ForStatement node) { |
| bool outerBreakValue = _enclosingBlockContainsBreak; |
| _enclosingBlockContainsBreak = false; |
| try { |
| if (node.variables != null && |
| _visitVariableDeclarations(node.variables.variables)) { |
| return true; |
| } |
| if (node.initialization != null && _nodeExits(node.initialization)) { |
| return true; |
| } |
| Expression conditionExpression = node.condition; |
| if (conditionExpression != null && _nodeExits(conditionExpression)) { |
| return true; |
| } |
| if (_visitExpressions(node.updaters)) { |
| return true; |
| } |
| // TODO(jwren) Do we want to take all constant expressions into account? |
| // If for(; true; ) (or for(;;)), and the body doesn't return or the body |
| // doesn't have a break, then return true. |
| bool implicitOrExplictTrue = |
| conditionExpression == null || |
| (conditionExpression is BooleanLiteral && conditionExpression.value); |
| if (implicitOrExplictTrue) { |
| bool blockReturns = _nodeExits(node.body); |
| if (blockReturns || !_enclosingBlockContainsBreak) { |
| return true; |
| } |
| } |
| return false; |
| } finally { |
| _enclosingBlockContainsBreak = outerBreakValue; |
| } |
| } |
| |
| @override |
| bool visitFunctionDeclarationStatement(FunctionDeclarationStatement node) => |
| false; |
| |
| @override |
| bool visitFunctionExpression(FunctionExpression node) => false; |
| |
| @override |
| bool visitFunctionExpressionInvocation(FunctionExpressionInvocation node) { |
| if (_nodeExits(node.function)) { |
| return true; |
| } |
| return node.argumentList.accept(this); |
| } |
| |
| @override |
| bool visitIdentifier(Identifier node) => false; |
| |
| @override |
| bool visitIfStatement(IfStatement node) { |
| Expression conditionExpression = node.condition; |
| Statement thenStatement = node.thenStatement; |
| Statement elseStatement = node.elseStatement; |
| if (_nodeExits(conditionExpression)) { |
| return true; |
| } |
| // TODO(jwren) Do we want to take all constant expressions into account? |
| if (conditionExpression is BooleanLiteral) { |
| BooleanLiteral booleanLiteral = conditionExpression; |
| if (booleanLiteral.value) { |
| // if(true) ... |
| return _nodeExits(thenStatement); |
| } else if (elseStatement != null) { |
| // if (false) ... |
| return _nodeExits(elseStatement); |
| } |
| } |
| if (thenStatement == null || elseStatement == null) { |
| return false; |
| } |
| return _nodeExits(thenStatement) && _nodeExits(elseStatement); |
| } |
| |
| @override |
| bool visitIndexExpression(IndexExpression node) { |
| Expression target = node.realTarget; |
| if (_nodeExits(target)) { |
| return true; |
| } |
| if (_nodeExits(node.index)) { |
| return true; |
| } |
| return false; |
| } |
| |
| @override |
| bool visitInstanceCreationExpression(InstanceCreationExpression node) => |
| _nodeExits(node.argumentList); |
| |
| @override |
| bool visitIsExpression(IsExpression node) => node.expression.accept(this); |
| |
| @override |
| bool visitLabel(Label node) => false; |
| |
| @override |
| bool visitLabeledStatement(LabeledStatement node) => |
| node.statement.accept(this); |
| |
| @override |
| bool visitLiteral(Literal node) => false; |
| |
| @override |
| bool visitMethodInvocation(MethodInvocation node) { |
| Expression target = node.realTarget; |
| if (target != null && target.accept(this)) { |
| return true; |
| } |
| return _nodeExits(node.argumentList); |
| } |
| |
| @override |
| bool visitNamedExpression(NamedExpression node) => |
| node.expression.accept(this); |
| |
| @override |
| bool visitParenthesizedExpression(ParenthesizedExpression node) => |
| node.expression.accept(this); |
| |
| @override |
| bool visitPostfixExpression(PostfixExpression node) => false; |
| |
| @override |
| bool visitPrefixExpression(PrefixExpression node) => false; |
| |
| @override |
| bool visitPropertyAccess(PropertyAccess node) { |
| Expression target = node.realTarget; |
| if (target != null && target.accept(this)) { |
| return true; |
| } |
| return false; |
| } |
| |
| @override |
| bool visitRethrowExpression(RethrowExpression node) => true; |
| |
| @override |
| bool visitReturnStatement(ReturnStatement node) => true; |
| |
| @override |
| bool visitSuperExpression(SuperExpression node) => false; |
| |
| @override |
| bool visitSwitchCase(SwitchCase node) => _visitStatements(node.statements); |
| |
| @override |
| bool visitSwitchDefault(SwitchDefault node) => |
| _visitStatements(node.statements); |
| |
| @override |
| bool visitSwitchStatement(SwitchStatement node) { |
| bool outerBreakValue = _enclosingBlockContainsBreak; |
| _enclosingBlockContainsBreak = false; |
| try { |
| bool hasDefault = false; |
| List<SwitchMember> members = node.members; |
| for (int i = 0; i < members.length; i++) { |
| SwitchMember switchMember = members[i]; |
| if (switchMember is SwitchDefault) { |
| hasDefault = true; |
| // If this is the last member and there are no statements, return |
| // false |
| if (switchMember.statements.isEmpty && i + 1 == members.length) { |
| return false; |
| } |
| } |
| // For switch members with no statements, don't visit the children, |
| // otherwise, return false if no return is found in the children |
| // statements. |
| if (!switchMember.statements.isEmpty && !switchMember.accept(this)) { |
| return false; |
| } |
| } |
| return hasDefault; |
| } finally { |
| _enclosingBlockContainsBreak = outerBreakValue; |
| } |
| } |
| |
| @override |
| bool visitThisExpression(ThisExpression node) => false; |
| |
| @override |
| bool visitThrowExpression(ThrowExpression node) => true; |
| |
| @override |
| bool visitTryStatement(TryStatement node) { |
| if (_nodeExits(node.body)) { |
| return true; |
| } |
| Block finallyBlock = node.finallyBlock; |
| if (_nodeExits(finallyBlock)) { |
| return true; |
| } |
| return false; |
| } |
| |
| @override |
| bool visitTypeName(TypeName node) => false; |
| |
| @override |
| bool visitVariableDeclaration(VariableDeclaration node) { |
| Expression initializer = node.initializer; |
| if (initializer != null) { |
| return initializer.accept(this); |
| } |
| return false; |
| } |
| |
| @override |
| bool visitVariableDeclarationList(VariableDeclarationList node) => |
| _visitVariableDeclarations(node.variables); |
| |
| @override |
| bool visitVariableDeclarationStatement(VariableDeclarationStatement node) { |
| NodeList<VariableDeclaration> variables = node.variables.variables; |
| for (int i = 0; i < variables.length; i++) { |
| if (variables[i].accept(this)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @override |
| bool visitWhileStatement(WhileStatement node) { |
| bool outerBreakValue = _enclosingBlockContainsBreak; |
| _enclosingBlockContainsBreak = false; |
| try { |
| Expression conditionExpression = node.condition; |
| if (conditionExpression.accept(this)) { |
| return true; |
| } |
| // TODO(jwren) Do we want to take all constant expressions into account? |
| if (conditionExpression is BooleanLiteral) { |
| BooleanLiteral booleanLiteral = conditionExpression; |
| // If while(true), and the body doesn't return or the body doesn't have |
| // a break, then return true. |
| bool blockReturns = node.body.accept(this); |
| if (booleanLiteral.value && |
| (blockReturns || !_enclosingBlockContainsBreak)) { |
| return true; |
| } |
| } |
| return false; |
| } finally { |
| _enclosingBlockContainsBreak = outerBreakValue; |
| } |
| } |
| |
| /** |
| * Return `true` if the given node exits. |
| * |
| * @param node the node being tested |
| * @return `true` if the given node exits |
| */ |
| bool _nodeExits(AstNode node) { |
| if (node == null) { |
| return false; |
| } |
| return node.accept(this); |
| } |
| |
| bool _visitExpressions(NodeList<Expression> expressions) { |
| for (int i = expressions.length - 1; i >= 0; i--) { |
| if (expressions[i].accept(this)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool _visitStatements(NodeList<Statement> statements) { |
| for (int i = statements.length - 1; i >= 0; i--) { |
| if (statements[i].accept(this)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool |
| _visitVariableDeclarations(NodeList<VariableDeclaration> variableDeclarations) { |
| for (int i = variableDeclarations.length - 1; i >= 0; i--) { |
| if (variableDeclarations[i].accept(this)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| } |
| |
| /** |
| * Instances of the class `FunctionScope` implement the scope defined by a function. |
| */ |
| class FunctionScope extends EnclosedScope { |
| final ExecutableElement _functionElement; |
| |
| bool _parametersDefined = false; |
| |
| /** |
| * Initialize a newly created scope enclosed within another scope. |
| * |
| * @param enclosingScope the scope in which this scope is lexically enclosed |
| * @param functionElement the element representing the type represented by this scope |
| */ |
| FunctionScope(Scope enclosingScope, this._functionElement) |
| : super(new EnclosedScope(enclosingScope)) { |
| if (_functionElement == null) { |
| throw new IllegalArgumentException("function element cannot be null"); |
| } |
| } |
| |
| /** |
| * Define the parameters for the given function in the scope that encloses this function. |
| */ |
| void defineParameters() { |
| if (_parametersDefined) { |
| return; |
| } |
| _parametersDefined = true; |
| Scope parameterScope = enclosingScope; |
| for (ParameterElement parameter in _functionElement.parameters) { |
| if (!parameter.isInitializingFormal) { |
| parameterScope.define(parameter); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `FunctionTypeScope` implement the scope defined by a function type |
| * alias. |
| */ |
| class FunctionTypeScope extends EnclosedScope { |
| final FunctionTypeAliasElement _typeElement; |
| |
| bool _parametersDefined = false; |
| |
| /** |
| * Initialize a newly created scope enclosed within another scope. |
| * |
| * @param enclosingScope the scope in which this scope is lexically enclosed |
| * @param typeElement the element representing the type alias represented by this scope |
| */ |
| FunctionTypeScope(Scope enclosingScope, this._typeElement) |
| : super(new EnclosedScope(enclosingScope)) { |
| _defineTypeParameters(); |
| } |
| |
| /** |
| * Define the parameters for the function type alias. |
| * |
| * @param typeElement the element representing the type represented by this scope |
| */ |
| void defineParameters() { |
| if (_parametersDefined) { |
| return; |
| } |
| _parametersDefined = true; |
| for (ParameterElement parameter in _typeElement.parameters) { |
| define(parameter); |
| } |
| } |
| |
| /** |
| * Define the type parameters for the function type alias. |
| * |
| * @param typeElement the element representing the type represented by this scope |
| */ |
| void _defineTypeParameters() { |
| Scope typeParameterScope = enclosingScope; |
| for (TypeParameterElement typeParameter in _typeElement.typeParameters) { |
| typeParameterScope.define(typeParameter); |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `HintGenerator` traverse a library's worth of dart code at a time to |
| * generate hints over the set of sources. |
| * |
| * See [HintCode]. |
| */ |
| class HintGenerator { |
| final List<CompilationUnit> _compilationUnits; |
| |
| final AnalysisContext _context; |
| |
| final AnalysisErrorListener _errorListener; |
| |
| LibraryElement _library; |
| |
| ImportsVerifier _importsVerifier; |
| |
| bool _enableDart2JSHints = false; |
| |
| /** |
| * The inheritance manager used to find overridden methods. |
| */ |
| InheritanceManager _manager; |
| |
| _GatherUsedElementsVisitor _usedElementsVisitor; |
| |
| HintGenerator(this._compilationUnits, this._context, this._errorListener) { |
| _library = _compilationUnits[0].element.library; |
| _importsVerifier = new ImportsVerifier(_library); |
| _enableDart2JSHints = _context.analysisOptions.dart2jsHint; |
| _manager = new InheritanceManager(_compilationUnits[0].element.library); |
| _usedElementsVisitor = new _GatherUsedElementsVisitor(_library); |
| } |
| |
| void generateForLibrary() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.hints.start(); |
| try { |
| for (int i = 0; i < _compilationUnits.length; i++) { |
| CompilationUnitElement element = _compilationUnits[i].element; |
| if (element != null) { |
| if (i == 0) { |
| _importsVerifier.inDefiningCompilationUnit = true; |
| _generateForCompilationUnit(_compilationUnits[i], element.source); |
| _importsVerifier.inDefiningCompilationUnit = false; |
| } else { |
| _generateForCompilationUnit(_compilationUnits[i], element.source); |
| } |
| } |
| } |
| ErrorReporter definingCompilationUnitErrorReporter = |
| new ErrorReporter(_errorListener, _compilationUnits[0].element.source); |
| _importsVerifier.generateDuplicateImportHints( |
| definingCompilationUnitErrorReporter); |
| _importsVerifier.generateUnusedImportHints( |
| definingCompilationUnitErrorReporter); |
| _library.accept( |
| new _UnusedElementsVerifier(_errorListener, _usedElementsVisitor.usedElements)); |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| void _generateForCompilationUnit(CompilationUnit unit, Source source) { |
| ErrorReporter errorReporter = new ErrorReporter(_errorListener, source); |
| unit.accept(_importsVerifier); |
| // dead code analysis |
| unit.accept(new DeadCodeVerifier(errorReporter)); |
| unit.accept(_usedElementsVisitor); |
| // dart2js analysis |
| if (_enableDart2JSHints) { |
| unit.accept(new Dart2JSVerifier(errorReporter)); |
| } |
| // Dart best practices |
| unit.accept(new BestPracticesVerifier(errorReporter)); |
| unit.accept(new OverrideVerifier(_manager, errorReporter)); |
| // Find to-do comments |
| new ToDoFinder(errorReporter).findIn(unit); |
| // pub analysis |
| // TODO(danrubel/jwren) Commented out until bugs in the pub verifier are |
| // fixed |
| // unit.accept(new PubVerifier(context, errorReporter)); |
| } |
| } |
| |
| |
| /// Traverses a library's worth of dart code at a time to generate lint warnings |
| /// over the set of sources. |
| /// |
| /// See [LintCode]. |
| class LintGenerator { |
| |
| /// A global container for contributed verifiers. |
| static final List<LintVerifier> VERIFIERS = <LintVerifier>[]; |
| |
| final Iterable<CompilationUnit> _compilationUnits; |
| final AnalysisErrorListener _errorListener; |
| final Iterable<LintVerifier> _verifiers; |
| |
| LintGenerator(this._compilationUnits, this._errorListener, |
| [Iterable<LintVerifier> verifiers]) |
| : _verifiers = verifiers != null ? verifiers : VERIFIERS; |
| |
| void generate() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.lint.start(); |
| try { |
| _compilationUnits.forEach((cu) { |
| if (cu.element != null) { |
| _generate(cu, cu.element.source); |
| } |
| }); |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| void _generate(CompilationUnit unit, Source source) { |
| ErrorReporter errorReporter = new ErrorReporter(_errorListener, source); |
| _verifiers.forEach((verifier) { |
| verifier.reporter = errorReporter; |
| return unit.accept(verifier); |
| }); |
| } |
| } |
| |
| /// Implementers contribute lint warnings via the provided error [reporter]. |
| abstract class LintVerifier extends RecursiveAstVisitor<Object> { |
| /// Used to report lint warnings. |
| /// NOTE: this is set by the framework before visit begins. |
| ErrorReporter reporter; |
| } |
| |
| |
| /** |
| * Instances of the class {@code HtmlTagInfo} record information about the tags used in an HTML |
| * file. |
| */ |
| class HtmlTagInfo { |
| /** |
| * An array containing all of the tags used in the HTML file. |
| */ |
| List<String> allTags; |
| |
| /** |
| * A table mapping the id's defined in the HTML file to an array containing the names of tags with |
| * that identifier. |
| */ |
| HashMap<String, String> idToTagMap; |
| |
| /** |
| * A table mapping the classes defined in the HTML file to an array containing the names of tags |
| * with that class. |
| */ |
| HashMap<String, List<String>> classToTagsMap; |
| |
| /** |
| * Initialize a newly created information holder to hold the given information about the tags in |
| * an HTML file. |
| * |
| * @param allTags an array containing all of the tags used in the HTML file |
| * @param idToTagMap a table mapping the id's defined in the HTML file to an array containing the |
| * names of tags with that identifier |
| * @param classToTagsMap a table mapping the classes defined in the HTML file to an array |
| * containing the names of tags with that class |
| */ |
| HtmlTagInfo(List<String> allTags, HashMap<String, String> idToTagMap, |
| HashMap<String, List<String>> classToTagsMap) { |
| this.allTags = allTags; |
| this.idToTagMap = idToTagMap; |
| this.classToTagsMap = classToTagsMap; |
| } |
| |
| /** |
| * Return an array containing the tags that have the given class, or {@code null} if there are no |
| * such tags. |
| * |
| * @return an array containing the tags that have the given class |
| */ |
| List<String> getTagsWithClass(String identifier) { |
| return classToTagsMap[identifier]; |
| } |
| |
| /** |
| * Return the tag that has the given identifier, or {@code null} if there is no such tag (the |
| * identifier is not defined). |
| * |
| * @return the tag that has the given identifier |
| */ |
| String getTagWithId(String identifier) { |
| return idToTagMap[identifier]; |
| } |
| } |
| |
| /** |
| * Instances of the class {@code HtmlTagInfoBuilder} gather information about the tags used in one |
| * or more HTML structures. |
| */ |
| class HtmlTagInfoBuilder implements ht.XmlVisitor { |
| /** |
| * The name of the 'id' attribute. |
| */ |
| static final String ID_ATTRIBUTE = "id"; |
| |
| /** |
| * The name of the 'class' attribute. |
| */ |
| static final String ID_CLASS = "class"; |
| |
| /** |
| * A set containing all of the tag names used in the HTML. |
| */ |
| HashSet<String> tagSet = new HashSet<String>(); |
| |
| /** |
| * A table mapping the id's that are defined to the tag name with that id. |
| */ |
| HashMap<String, String> idMap = new HashMap<String, String>(); |
| |
| /** |
| * A table mapping the classes that are defined to a set of the tag names with that class. |
| */ |
| HashMap<String, HashSet<String>> classMap = |
| new HashMap<String, HashSet<String>>(); |
| |
| /** |
| * Initialize a newly created HTML tag info builder. |
| */ |
| HtmlTagInfoBuilder(); |
| |
| /** |
| * Create a tag information holder holding all of the information gathered about the tags in the |
| * HTML structures that were visited. |
| * |
| * @return the information gathered about the tags in the visited HTML structures |
| */ |
| HtmlTagInfo getTagInfo() { |
| List<String> allTags = tagSet.toList(); |
| HashMap<String, List<String>> classToTagsMap = |
| new HashMap<String, List<String>>(); |
| classMap.forEach((String key, Set<String> tags) { |
| classToTagsMap[key] = tags.toList(); |
| }); |
| return new HtmlTagInfo(allTags, idMap, classToTagsMap); |
| } |
| |
| @override |
| visitHtmlScriptTagNode(ht.HtmlScriptTagNode node) { |
| visitXmlTagNode(node); |
| } |
| |
| @override |
| visitHtmlUnit(ht.HtmlUnit node) { |
| node.visitChildren(this); |
| } |
| |
| @override |
| visitXmlAttributeNode(ht.XmlAttributeNode node) { |
| } |
| |
| @override |
| visitXmlTagNode(ht.XmlTagNode node) { |
| node.visitChildren(this); |
| String tagName = node.tag; |
| tagSet.add(tagName); |
| for (ht.XmlAttributeNode attribute in node.attributes) { |
| String attributeName = attribute.name; |
| if (attributeName == ID_ATTRIBUTE) { |
| String attributeValue = attribute.text; |
| if (attributeValue != null) { |
| String tag = idMap[attributeValue]; |
| if (tag == null) { |
| idMap[attributeValue] = tagName; |
| } else { |
| // reportError(HtmlWarningCode.MULTIPLY_DEFINED_ID, valueToken); |
| } |
| } |
| } else if (attributeName == ID_CLASS) { |
| String attributeValue = attribute.text; |
| if (attributeValue != null) { |
| HashSet<String> tagList = classMap[attributeValue]; |
| if (tagList == null) { |
| tagList = new HashSet<String>(); |
| classMap[attributeValue] = tagList; |
| } else { |
| // reportError(HtmlWarningCode.MULTIPLY_DEFINED_ID, valueToken); |
| } |
| tagList.add(tagName); |
| } |
| } |
| } |
| } |
| |
| // /** |
| // * Report an error with the given error code at the given location. Use the given arguments to |
| // * compose the error message. |
| // * |
| // * @param errorCode the error code of the error to be reported |
| // * @param offset the offset of the first character to be highlighted |
| // * @param length the number of characters to be highlighted |
| // * @param arguments the arguments used to compose the error message |
| // */ |
| // private void reportError(ErrorCode errorCode, Token token, Object... arguments) { |
| // errorListener.onError(new AnalysisError( |
| // htmlElement.getSource(), |
| // token.getOffset(), |
| // token.getLength(), |
| // errorCode, |
| // arguments)); |
| // } |
| // |
| // /** |
| // * Report an error with the given error code at the given location. Use the given arguments to |
| // * compose the error message. |
| // * |
| // * @param errorCode the error code of the error to be reported |
| // * @param offset the offset of the first character to be highlighted |
| // * @param length the number of characters to be highlighted |
| // * @param arguments the arguments used to compose the error message |
| // */ |
| // private void reportError(ErrorCode errorCode, int offset, int length, Object... arguments) { |
| // errorListener.onError(new AnalysisError( |
| // htmlElement.getSource(), |
| // offset, |
| // length, |
| // errorCode, |
| // arguments)); |
| // } |
| } |
| |
| /** |
| * Instances of the class `HtmlUnitBuilder` build an element model for a single HTML unit. |
| */ |
| class HtmlUnitBuilder implements ht.XmlVisitor<Object> { |
| static String _SRC = "src"; |
| |
| /** |
| * The analysis context in which the element model will be built. |
| */ |
| final InternalAnalysisContext _context; |
| |
| /** |
| * The error listener to which errors will be reported. |
| */ |
| RecordingErrorListener _errorListener; |
| |
| /** |
| * The HTML element being built. |
| */ |
| HtmlElementImpl _htmlElement; |
| |
| /** |
| * The elements in the path from the HTML unit to the current tag node. |
| */ |
| List<ht.XmlTagNode> _parentNodes; |
| |
| /** |
| * The script elements being built. |
| */ |
| List<HtmlScriptElement> _scripts; |
| |
| /** |
| * A set of the libraries that were resolved while resolving the HTML unit. |
| */ |
| Set<Library> _resolvedLibraries = new HashSet<Library>(); |
| |
| /** |
| * Initialize a newly created HTML unit builder. |
| * |
| * @param context the analysis context in which the element model will be built |
| */ |
| HtmlUnitBuilder(this._context) { |
| this._errorListener = new RecordingErrorListener(); |
| } |
| |
| /** |
| * Return the listener to which analysis errors will be reported. |
| * |
| * @return the listener to which analysis errors will be reported |
| */ |
| RecordingErrorListener get errorListener => _errorListener; |
| |
| /** |
| * Return an array containing information about all of the libraries that were resolved. |
| * |
| * @return an array containing the libraries that were resolved |
| */ |
| Set<Library> get resolvedLibraries => _resolvedLibraries; |
| |
| /** |
| * Build the HTML element for the given source. |
| * |
| * @param source the source describing the compilation unit |
| * @param unit the AST structure representing the HTML |
| * @throws AnalysisException if the analysis could not be performed |
| */ |
| HtmlElementImpl buildHtmlElement(Source source, ht.HtmlUnit unit) { |
| HtmlElementImpl result = new HtmlElementImpl(_context, source.shortName); |
| result.source = source; |
| _htmlElement = result; |
| unit.accept(this); |
| _htmlElement = null; |
| unit.element = result; |
| return result; |
| } |
| |
| @override |
| Object visitHtmlScriptTagNode(ht.HtmlScriptTagNode node) { |
| if (_parentNodes.contains(node)) { |
| return _reportCircularity(node); |
| } |
| _parentNodes.add(node); |
| try { |
| Source htmlSource = _htmlElement.source; |
| ht.XmlAttributeNode scriptAttribute = _getScriptSourcePath(node); |
| String scriptSourcePath = |
| scriptAttribute == null ? null : scriptAttribute.text; |
| if (node.attributeEnd.type == ht.TokenType.GT && |
| scriptSourcePath == null) { |
| EmbeddedHtmlScriptElementImpl script = |
| new EmbeddedHtmlScriptElementImpl(node); |
| try { |
| LibraryResolver resolver = new LibraryResolver(_context); |
| LibraryElementImpl library = |
| resolver.resolveEmbeddedLibrary(htmlSource, node.script, true); |
| script.scriptLibrary = library; |
| _resolvedLibraries.addAll(resolver.resolvedLibraries); |
| _errorListener.addAll(resolver.errorListener); |
| } on AnalysisException catch (exception, stackTrace) { |
| //TODO (danrubel): Handle or forward the exception |
| AnalysisEngine.instance.logger.logError( |
| "Could not resolve script tag", |
| new CaughtException(exception, stackTrace)); |
| } |
| node.scriptElement = script; |
| _scripts.add(script); |
| } else { |
| ExternalHtmlScriptElementImpl script = |
| new ExternalHtmlScriptElementImpl(node); |
| if (scriptSourcePath != null) { |
| try { |
| scriptSourcePath = Uri.encodeFull(scriptSourcePath); |
| // Force an exception to be thrown if the URI is invalid so that we |
| // can report the problem. |
| parseUriWithException(scriptSourcePath); |
| Source scriptSource = |
| _context.sourceFactory.resolveUri(htmlSource, scriptSourcePath); |
| script.scriptSource = scriptSource; |
| if (!_context.exists(scriptSource)) { |
| _reportValueError( |
| HtmlWarningCode.URI_DOES_NOT_EXIST, |
| scriptAttribute, |
| [scriptSourcePath]); |
| } |
| } on URISyntaxException catch (exception) { |
| _reportValueError( |
| HtmlWarningCode.INVALID_URI, |
| scriptAttribute, |
| [scriptSourcePath]); |
| } |
| } |
| node.scriptElement = script; |
| _scripts.add(script); |
| } |
| } finally { |
| _parentNodes.remove(node); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitHtmlUnit(ht.HtmlUnit node) { |
| _parentNodes = new List<ht.XmlTagNode>(); |
| _scripts = new List<HtmlScriptElement>(); |
| try { |
| node.visitChildren(this); |
| _htmlElement.scripts = new List.from(_scripts); |
| } finally { |
| _scripts = null; |
| _parentNodes = null; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitXmlAttributeNode(ht.XmlAttributeNode node) => null; |
| |
| @override |
| Object visitXmlTagNode(ht.XmlTagNode node) { |
| if (_parentNodes.contains(node)) { |
| return _reportCircularity(node); |
| } |
| _parentNodes.add(node); |
| try { |
| node.visitChildren(this); |
| } finally { |
| _parentNodes.remove(node); |
| } |
| return null; |
| } |
| |
| /** |
| * Return the first source attribute for the given tag node, or `null` if it does not exist. |
| * |
| * @param node the node containing attributes |
| * @return the source attribute contained in the given tag |
| */ |
| ht.XmlAttributeNode _getScriptSourcePath(ht.XmlTagNode node) { |
| for (ht.XmlAttributeNode attribute in node.attributes) { |
| if (attribute.name == _SRC) { |
| return attribute; |
| } |
| } |
| return null; |
| } |
| |
| Object _reportCircularity(ht.XmlTagNode node) { |
| // |
| // This should not be possible, but we have an error report that suggests |
| // that it happened at least once. This code will guard against infinite |
| // recursion and might help us identify the cause of the issue. |
| // |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("Found circularity in XML nodes: "); |
| bool first = true; |
| for (ht.XmlTagNode pathNode in _parentNodes) { |
| if (first) { |
| first = false; |
| } else { |
| buffer.write(", "); |
| } |
| String tagName = pathNode.tag; |
| if (identical(pathNode, node)) { |
| buffer.write("*"); |
| buffer.write(tagName); |
| buffer.write("*"); |
| } else { |
| buffer.write(tagName); |
| } |
| } |
| AnalysisEngine.instance.logger.logError(buffer.toString()); |
| return null; |
| } |
| |
| /** |
| * Report an error with the given error code at the given location. Use the given arguments to |
| * compose the error message. |
| * |
| * @param errorCode the error code of the error to be reported |
| * @param offset the offset of the first character to be highlighted |
| * @param length the number of characters to be highlighted |
| * @param arguments the arguments used to compose the error message |
| */ |
| void _reportErrorForOffset(ErrorCode errorCode, int offset, int length, |
| List<Object> arguments) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| _htmlElement.source, |
| offset, |
| length, |
| errorCode, |
| arguments)); |
| } |
| |
| /** |
| * Report an error with the given error code at the location of the value of the given attribute. |
| * Use the given arguments to compose the error message. |
| * |
| * @param errorCode the error code of the error to be reported |
| * @param offset the offset of the first character to be highlighted |
| * @param length the number of characters to be highlighted |
| * @param arguments the arguments used to compose the error message |
| */ |
| void _reportValueError(ErrorCode errorCode, ht.XmlAttributeNode attribute, |
| List<Object> arguments) { |
| int offset = attribute.valueToken.offset + 1; |
| int length = attribute.valueToken.length - 2; |
| _reportErrorForOffset(errorCode, offset, length, arguments); |
| } |
| } |
| |
| /** |
| * Instances of the class `ImplicitConstructorBuilder` are used to build |
| * implicit constructors for mixin applications, and to check for errors |
| * related to super constructor calls in class declarations with mixins. |
| * |
| * The visitor methods don't directly build the implicit constructors or check |
| * for errors, since they don't in general visit the classes in the proper |
| * order to do so correctly. Instead, they pass closures to |
| * ImplicitConstructorBuilderCallback to inform it of the computations to be |
| * done and their ordering dependencies. |
| */ |
| class ImplicitConstructorBuilder extends ScopedVisitor { |
| /** |
| * Callback to receive the computations to be performed. |
| */ |
| final ImplicitConstructorBuilderCallback _callback; |
| |
| /** |
| * Initialize a newly created visitor to build implicit constructors for file |
| * [source], in library [libraryElement], which has scope [libraryScope]. Use |
| * [typeProvider] to access types from the core library. |
| * |
| * The visit methods will pass closures to [_callback] to indicate what |
| * computation needs to be performed, and its dependency order. |
| */ |
| ImplicitConstructorBuilder(Source source, LibraryElement libraryElement, |
| LibraryScope libraryScope, TypeProvider typeProvider, this._callback) |
| : super.con3( |
| libraryElement, |
| source, |
| typeProvider, |
| libraryScope, |
| libraryScope.errorListener); |
| |
| @override |
| Object visitClassDeclaration(ClassDeclaration node) { |
| ClassElementImpl classElement = node.element; |
| classElement.mixinErrorsReported = false; |
| if (node.extendsClause != null && node.withClause != null) { |
| // We don't need to build any implicitly constructors for the mixin |
| // application (since there isn't an explicit element for it), but we |
| // need to verify that they _could_ be built. |
| InterfaceType superclassType = null; |
| TypeName superclassName = node.extendsClause.superclass; |
| DartType type = superclassName.type; |
| if (type is InterfaceType) { |
| superclassType = type; |
| } else { |
| superclassType = typeProvider.objectType; |
| } |
| ClassElement superclassElement = classElement.supertype.element; |
| if (superclassElement != null) { |
| _callback(classElement, superclassElement, () { |
| bool constructorFound = false; |
| void callback(ConstructorElement explicitConstructor, |
| List<DartType> parameterTypes, List<DartType> argumentTypes) { |
| constructorFound = true; |
| } |
| if (_findForwardedConstructors( |
| classElement, |
| superclassName, |
| superclassType, |
| callback) && |
| !constructorFound) { |
| reportErrorForNode( |
| CompileTimeErrorCode.MIXIN_HAS_NO_CONSTRUCTORS, |
| node.withClause, |
| [superclassType.element.name]); |
| classElement.mixinErrorsReported = true; |
| } |
| }); |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitClassTypeAlias(ClassTypeAlias node) { |
| super.visitClassTypeAlias(node); |
| InterfaceType superclassType = null; |
| TypeName superclassName = node.superclass; |
| DartType type = superclassName.type; |
| if (type is InterfaceType) { |
| superclassType = type; |
| } else { |
| superclassType = typeProvider.objectType; |
| } |
| ClassElementImpl classElement = node.element as ClassElementImpl; |
| if (classElement != null) { |
| ClassElement superclassElement = superclassType.element; |
| if (superclassElement != null) { |
| _callback(classElement, superclassElement, () { |
| List<ConstructorElement> implicitConstructors = |
| new List<ConstructorElement>(); |
| void callback(ConstructorElement explicitConstructor, |
| List<DartType> parameterTypes, List<DartType> argumentTypes) { |
| implicitConstructors.add( |
| _createImplicitContructor( |
| classElement.type, |
| explicitConstructor, |
| parameterTypes, |
| argumentTypes)); |
| } |
| if (_findForwardedConstructors( |
| classElement, |
| superclassName, |
| superclassType, |
| callback)) { |
| if (implicitConstructors.isEmpty) { |
| reportErrorForNode( |
| CompileTimeErrorCode.MIXIN_HAS_NO_CONSTRUCTORS, |
| node, |
| [superclassElement.name]); |
| } else { |
| classElement.constructors = implicitConstructors; |
| } |
| } |
| }); |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitEnumDeclaration(EnumDeclaration node) => null; |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) => null; |
| |
| @override |
| Object visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) => |
| null; |
| |
| /** |
| * Create an implicit constructor that is copied from the given constructor, but that is in the |
| * given class. |
| * |
| * @param classType the class in which the implicit constructor is defined |
| * @param explicitConstructor the constructor on which the implicit constructor is modeled |
| * @param parameterTypes the types to be replaced when creating parameters |
| * @param argumentTypes the types with which the parameters are to be replaced |
| * @return the implicit constructor that was created |
| */ |
| ConstructorElement _createImplicitContructor(InterfaceType classType, |
| ConstructorElement explicitConstructor, List<DartType> parameterTypes, |
| List<DartType> argumentTypes) { |
| ConstructorElementImpl implicitConstructor = |
| new ConstructorElementImpl(explicitConstructor.name, -1); |
| implicitConstructor.synthetic = true; |
| implicitConstructor.redirectedConstructor = explicitConstructor; |
| implicitConstructor.const2 = explicitConstructor.isConst; |
| implicitConstructor.returnType = classType; |
| List<ParameterElement> explicitParameters = explicitConstructor.parameters; |
| int count = explicitParameters.length; |
| if (count > 0) { |
| List<ParameterElement> implicitParameters = |
| new List<ParameterElement>(count); |
| for (int i = 0; i < count; i++) { |
| ParameterElement explicitParameter = explicitParameters[i]; |
| ParameterElementImpl implicitParameter = |
| new ParameterElementImpl(explicitParameter.name, -1); |
| implicitParameter.const3 = explicitParameter.isConst; |
| implicitParameter.final2 = explicitParameter.isFinal; |
| implicitParameter.parameterKind = explicitParameter.parameterKind; |
| implicitParameter.synthetic = true; |
| implicitParameter.type = |
| explicitParameter.type.substitute2(argumentTypes, parameterTypes); |
| implicitParameters[i] = implicitParameter; |
| } |
| implicitConstructor.parameters = implicitParameters; |
| } |
| FunctionTypeImpl type = new FunctionTypeImpl.con1(implicitConstructor); |
| type.typeArguments = classType.typeArguments; |
| implicitConstructor.type = type; |
| return implicitConstructor; |
| } |
| |
| /** |
| * Find all the constructors that should be forwarded from the superclass |
| * named [superclassName], having type [superclassType], to the class or |
| * mixin application [classElement], and pass information about them to |
| * [callback]. |
| * |
| * Return true if some constructors were considered. (A false return value |
| * can only happen if the supeclass is a built-in type, in which case it |
| * can't be used as a mixin anyway). |
| */ |
| bool _findForwardedConstructors(ClassElementImpl classElement, |
| TypeName superclassName, InterfaceType superclassType, void |
| callback(ConstructorElement explicitConstructor, List<DartType> parameterTypes, |
| List<DartType> argumentTypes)) { |
| ClassElement superclassElement = superclassType.element; |
| List<ConstructorElement> constructors = superclassElement.constructors; |
| int count = constructors.length; |
| if (count == 0) { |
| return false; |
| } |
| List<DartType> parameterTypes = |
| TypeParameterTypeImpl.getTypes(superclassType.typeParameters); |
| List<DartType> argumentTypes = |
| _getArgumentTypes(superclassName.typeArguments, parameterTypes); |
| for (int i = 0; i < count; i++) { |
| ConstructorElement explicitConstructor = constructors[i]; |
| if (!explicitConstructor.isFactory && |
| classElement.isSuperConstructorAccessible(explicitConstructor)) { |
| callback(explicitConstructor, parameterTypes, argumentTypes); |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Return an array of argument types that corresponds to the array of parameter types and that are |
| * derived from the given list of type arguments. |
| * |
| * @param typeArguments the type arguments from which the types will be taken |
| * @param parameterTypes the parameter types that must be matched by the type arguments |
| * @return the argument types that correspond to the parameter types |
| */ |
| List<DartType> _getArgumentTypes(TypeArgumentList typeArguments, |
| List<DartType> parameterTypes) { |
| DynamicTypeImpl dynamic = DynamicTypeImpl.instance; |
| int parameterCount = parameterTypes.length; |
| List<DartType> types = new List<DartType>(parameterCount); |
| if (typeArguments == null) { |
| for (int i = 0; i < parameterCount; i++) { |
| types[i] = dynamic; |
| } |
| } else { |
| NodeList<TypeName> arguments = typeArguments.arguments; |
| int argumentCount = math.min(arguments.length, parameterCount); |
| for (int i = 0; i < argumentCount; i++) { |
| types[i] = arguments[i].type; |
| } |
| for (int i = argumentCount; i < parameterCount; i++) { |
| types[i] = dynamic; |
| } |
| } |
| return types; |
| } |
| } |
| |
| /** |
| * An instance of this class is capable of running ImplicitConstructorBuilder |
| * over all classes in a library cycle. |
| */ |
| class ImplicitConstructorComputer { |
| /** |
| * The object used to access the types from the core library. |
| */ |
| final TypeProvider typeProvider; |
| |
| /** |
| * Directed graph of dependencies between classes that need to have their |
| * implicit constructors computed. Each edge in the graph points from a |
| * derived class to its superclass. Implicit constructors will be computed |
| * for the superclass before they are compute for the derived class. |
| */ |
| DirectedGraph<ClassElement> _dependencies = new DirectedGraph<ClassElement>(); |
| |
| /** |
| * Map from ClassElement to the function which will compute the class's |
| * implicit constructors. |
| */ |
| Map<ClassElement, VoidFunction> _computations = |
| new HashMap<ClassElement, VoidFunction>(); |
| |
| /** |
| * Create an ImplicitConstructorComputer which will use [typeProvider] to |
| * access types from the core library. |
| */ |
| ImplicitConstructorComputer(this.typeProvider); |
| |
| /** |
| * Add the given [unit] to the list of units which need to have implicit |
| * constructors built for them. [source] is the source file corresponding to |
| * the compilation unit, [libraryElement] is the library element containing |
| * that source, and [libraryScope] is the scope for the library element. |
| */ |
| void add(CompilationUnit unit, Source source, LibraryElement libraryElement, |
| LibraryScope libraryScope) { |
| unit.accept( |
| new ImplicitConstructorBuilder( |
| source, |
| libraryElement, |
| libraryScope, |
| typeProvider, |
| _defer)); |
| } |
| |
| /** |
| * Compute the implicit constructors for all compilation units that have been |
| * passed to [add]. |
| */ |
| void compute() { |
| List<List<ClassElement>> topologicalSort = |
| _dependencies.computeTopologicalSort(); |
| for (List<ClassElement> classesInCycle in topologicalSort) { |
| // Note: a cycle could occur if there is a loop in the inheritance graph. |
| // Such loops are forbidden by Dart but could occur in the analysis of |
| // incorrect code. If this happens, we simply visit the classes |
| // constituting the loop in any order. |
| for (ClassElement classElement in classesInCycle) { |
| VoidFunction computation = _computations[classElement]; |
| if (computation != null) { |
| computation(); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Defer execution of [computation], which builds implicit constructors for |
| * [classElement], until after implicit constructors have been built for |
| * [superclassElement]. |
| */ |
| void _defer(ClassElement classElement, ClassElement superclassElement, void |
| computation()) { |
| assert(!_computations.containsKey(classElement)); |
| _computations[classElement] = computation; |
| _dependencies.addEdge(classElement, superclassElement); |
| } |
| } |
| |
| /** |
| * Instances of the class `ImplicitLabelScope` represent the scope statements |
| * that can be the target of unlabeled break and continue statements. |
| */ |
| class ImplicitLabelScope { |
| /** |
| * The implicit label scope associated with the top level of a function. |
| */ |
| static const ImplicitLabelScope ROOT = const ImplicitLabelScope._(null, null); |
| |
| /** |
| * The implicit label scope enclosing this implicit label scope. |
| */ |
| final ImplicitLabelScope outerScope; |
| |
| /** |
| * The statement that acts as a target for break and/or continue statements |
| * at this scoping level. |
| */ |
| final Statement statement; |
| |
| /** |
| * Private constructor. |
| */ |
| const ImplicitLabelScope._(this.outerScope, this.statement); |
| |
| /** |
| * Get the statement which should be the target of an unlabeled `break` or |
| * `continue` statement, or `null` if there is no appropriate target. |
| */ |
| Statement getTarget(bool isContinue) { |
| if (outerScope == null) { |
| // This scope represents the toplevel of a function body, so it doesn't |
| // match either break or continue. |
| return null; |
| } |
| if (isContinue && statement is SwitchStatement) { |
| return outerScope.getTarget(isContinue); |
| } |
| return statement; |
| } |
| |
| /** |
| * Initialize a newly created scope to represent a switch statement or loop |
| * nested within the current scope. [statement] is the statement associated |
| * with the newly created scope. |
| */ |
| ImplicitLabelScope nest(Statement statement) => |
| new ImplicitLabelScope._(this, statement); |
| } |
| |
| /** |
| * Instances of the class `ImportsVerifier` visit all of the referenced libraries in the |
| * source code verifying that all of the imports are used, otherwise a |
| * [HintCode.UNUSED_IMPORT] is generated with |
| * [generateUnusedImportHints]. |
| * |
| * While this class does not yet have support for an "Organize Imports" action, this logic built up |
| * in this class could be used for such an action in the future. |
| */ |
| class ImportsVerifier extends RecursiveAstVisitor<Object> { |
| /** |
| * This is set to `true` if the current compilation unit which is being visited is the |
| * defining compilation unit for the library, its value can be set with |
| * [setInDefiningCompilationUnit]. |
| */ |
| bool _inDefiningCompilationUnit = false; |
| |
| /** |
| * The current library. |
| */ |
| LibraryElement _currentLibrary; |
| |
| /** |
| * A list of [ImportDirective]s that the current library imports, as identifiers are visited |
| * by this visitor and an import has been identified as being used by the library, the |
| * [ImportDirective] is removed from this list. After all the sources in the library have |
| * been evaluated, this list represents the set of unused imports. |
| * |
| * See [ImportsVerifier.generateUnusedImportErrors]. |
| */ |
| List<ImportDirective> _unusedImports; |
| |
| /** |
| * After the list of [unusedImports] has been computed, this list is a proper subset of the |
| * unused imports that are listed more than once. |
| */ |
| List<ImportDirective> _duplicateImports; |
| |
| /** |
| * This is a map between the set of [LibraryElement]s that the current library imports, and |
| * a list of [ImportDirective]s that imports the library. In cases where the current library |
| * imports a library with a single directive (such as `import lib1.dart;`), the library |
| * element will map to a list of one [ImportDirective], which will then be removed from the |
| * [unusedImports] list. In cases where the current library imports a library with multiple |
| * directives (such as `import lib1.dart; import lib1.dart show C;`), the |
| * [LibraryElement] will be mapped to a list of the import directives, and the namespace |
| * will need to be used to compute the correct [ImportDirective] being used, see |
| * [namespaceMap]. |
| */ |
| HashMap<LibraryElement, List<ImportDirective>> _libraryMap; |
| |
| /** |
| * In cases where there is more than one import directive per library element, this mapping is |
| * used to determine which of the multiple import directives are used by generating a |
| * [Namespace] for each of the imports to do lookups in the same way that they are done from |
| * the [ElementResolver]. |
| */ |
| HashMap<ImportDirective, Namespace> _namespaceMap; |
| |
| /** |
| * This is a map between prefix elements and the import directives from which they are derived. In |
| * cases where a type is referenced via a prefix element, the import directive can be marked as |
| * used (removed from the unusedImports) by looking at the resolved `lib` in `lib.X`, |
| * instead of looking at which library the `lib.X` resolves. |
| * |
| * TODO (jwren) Since multiple [ImportDirective]s can share the same [PrefixElement], |
| * it is possible to have an unreported unused import in situations where two imports use the same |
| * prefix and at least one import directive is used. |
| */ |
| HashMap<PrefixElement, List<ImportDirective>> _prefixElementMap; |
| |
| /** |
| * Create a new instance of the [ImportsVerifier]. |
| * |
| * @param errorReporter the error reporter |
| */ |
| ImportsVerifier(LibraryElement library) { |
| this._currentLibrary = library; |
| this._unusedImports = new List<ImportDirective>(); |
| this._duplicateImports = new List<ImportDirective>(); |
| this._libraryMap = new HashMap<LibraryElement, List<ImportDirective>>(); |
| this._namespaceMap = new HashMap<ImportDirective, Namespace>(); |
| this._prefixElementMap = |
| new HashMap<PrefixElement, List<ImportDirective>>(); |
| } |
| |
| void set inDefiningCompilationUnit(bool inDefiningCompilationUnit) { |
| this._inDefiningCompilationUnit = inDefiningCompilationUnit; |
| } |
| |
| /** |
| * Any time after the defining compilation unit has been visited by this visitor, this method can |
| * be called to report an [HintCode.DUPLICATE_IMPORT] hint for each of the import directives |
| * in the [duplicateImports] list. |
| * |
| * @param errorReporter the error reporter to report the set of [HintCode.DUPLICATE_IMPORT] |
| * hints to |
| */ |
| void generateDuplicateImportHints(ErrorReporter errorReporter) { |
| for (ImportDirective duplicateImport in _duplicateImports) { |
| errorReporter.reportErrorForNode( |
| HintCode.DUPLICATE_IMPORT, |
| duplicateImport.uri); |
| } |
| } |
| |
| /** |
| * After all of the compilation units have been visited by this visitor, this method can be called |
| * to report an [HintCode.UNUSED_IMPORT] hint for each of the import directives in the |
| * [unusedImports] list. |
| * |
| * @param errorReporter the error reporter to report the set of [HintCode.UNUSED_IMPORT] |
| * hints to |
| */ |
| void generateUnusedImportHints(ErrorReporter errorReporter) { |
| for (ImportDirective unusedImport in _unusedImports) { |
| // Check that the import isn't dart:core |
| ImportElement importElement = unusedImport.element; |
| if (importElement != null) { |
| LibraryElement libraryElement = importElement.importedLibrary; |
| if (libraryElement != null && libraryElement.isDartCore) { |
| continue; |
| } |
| } |
| errorReporter.reportErrorForNode( |
| HintCode.UNUSED_IMPORT, |
| unusedImport.uri); |
| } |
| } |
| |
| @override |
| Object visitCompilationUnit(CompilationUnit node) { |
| if (_inDefiningCompilationUnit) { |
| NodeList<Directive> directives = node.directives; |
| for (Directive directive in directives) { |
| if (directive is ImportDirective) { |
| ImportDirective importDirective = directive; |
| LibraryElement libraryElement = importDirective.uriElement; |
| if (libraryElement != null) { |
| _unusedImports.add(importDirective); |
| // |
| // Initialize prefixElementMap |
| // |
| if (importDirective.asToken != null) { |
| SimpleIdentifier prefixIdentifier = importDirective.prefix; |
| if (prefixIdentifier != null) { |
| Element element = prefixIdentifier.staticElement; |
| if (element is PrefixElement) { |
| PrefixElement prefixElementKey = element; |
| List<ImportDirective> list = |
| _prefixElementMap[prefixElementKey]; |
| if (list == null) { |
| list = new List<ImportDirective>(); |
| _prefixElementMap[prefixElementKey] = list; |
| } |
| list.add(importDirective); |
| } |
| // TODO (jwren) Can the element ever not be a PrefixElement? |
| } |
| } |
| // |
| // Initialize libraryMap: libraryElement -> importDirective |
| // |
| _putIntoLibraryMap(libraryElement, importDirective); |
| // |
| // For this new addition to the libraryMap, also recursively add any |
| // exports from the libraryElement. |
| // |
| _addAdditionalLibrariesForExports( |
| libraryElement, |
| importDirective, |
| new List<LibraryElement>()); |
| } |
| } |
| } |
| } |
| // If there are no imports in this library, don't visit the identifiers in |
| // the library- there can be no unused imports. |
| if (_unusedImports.isEmpty) { |
| return null; |
| } |
| if (_unusedImports.length > 1) { |
| // order the list of unusedImports to find duplicates in faster than |
| // O(n^2) time |
| List<ImportDirective> importDirectiveArray = |
| new List.from(_unusedImports); |
| importDirectiveArray.sort(ImportDirective.COMPARATOR); |
| ImportDirective currentDirective = importDirectiveArray[0]; |
| for (int i = 1; i < importDirectiveArray.length; i++) { |
| ImportDirective nextDirective = importDirectiveArray[i]; |
| if (ImportDirective.COMPARATOR(currentDirective, nextDirective) == 0) { |
| // Add either the currentDirective or nextDirective depending on which |
| // comes second, this guarantees that the first of the duplicates |
| // won't be highlighted. |
| if (currentDirective.offset < nextDirective.offset) { |
| _duplicateImports.add(nextDirective); |
| } else { |
| _duplicateImports.add(currentDirective); |
| } |
| } |
| currentDirective = nextDirective; |
| } |
| } |
| return super.visitCompilationUnit(node); |
| } |
| |
| @override |
| Object visitExportDirective(ExportDirective node) { |
| _visitMetadata(node.metadata); |
| return null; |
| } |
| |
| @override |
| Object visitImportDirective(ImportDirective node) { |
| _visitMetadata(node.metadata); |
| return null; |
| } |
| |
| @override |
| Object visitLibraryDirective(LibraryDirective node) { |
| _visitMetadata(node.metadata); |
| return null; |
| } |
| |
| @override |
| Object visitPrefixedIdentifier(PrefixedIdentifier node) { |
| if (_unusedImports.isEmpty) { |
| return null; |
| } |
| // If the prefixed identifier references some A.B, where A is a library |
| // prefix, then we can lookup the associated ImportDirective in |
| // prefixElementMap and remove it from the unusedImports list. |
| SimpleIdentifier prefixIdentifier = node.prefix; |
| Element element = prefixIdentifier.staticElement; |
| if (element is PrefixElement) { |
| List<ImportDirective> importDirectives = _prefixElementMap[element]; |
| if (importDirectives != null) { |
| for (ImportDirective importDirective in importDirectives) { |
| _unusedImports.remove(importDirective); |
| } |
| } |
| return null; |
| } |
| // Otherwise, pass the prefixed identifier element and name onto |
| // visitIdentifier. |
| return _visitIdentifier(element, prefixIdentifier.name); |
| } |
| |
| @override |
| Object visitSimpleIdentifier(SimpleIdentifier node) { |
| if (_unusedImports.isEmpty) { |
| return null; |
| } |
| return _visitIdentifier(node.staticElement, node.name); |
| } |
| |
| /** |
| * Recursively add any exported library elements into the [libraryMap]. |
| */ |
| void _addAdditionalLibrariesForExports(LibraryElement library, |
| ImportDirective importDirective, List<LibraryElement> exportPath) { |
| if (exportPath.contains(library)) { |
| return; |
| } |
| exportPath.add(library); |
| for (LibraryElement exportedLibraryElt in library.exportedLibraries) { |
| _putIntoLibraryMap(exportedLibraryElt, importDirective); |
| _addAdditionalLibrariesForExports( |
| exportedLibraryElt, |
| importDirective, |
| exportPath); |
| } |
| } |
| |
| /** |
| * Lookup and return the [Namespace] from the [namespaceMap], if the map does not |
| * have the computed namespace, compute it and cache it in the map. If the import directive is not |
| * resolved or is not resolvable, `null` is returned. |
| * |
| * @param importDirective the import directive used to compute the returned namespace |
| * @return the computed or looked up [Namespace] |
| */ |
| Namespace _computeNamespace(ImportDirective importDirective) { |
| Namespace namespace = _namespaceMap[importDirective]; |
| if (namespace == null) { |
| // If the namespace isn't in the namespaceMap, then compute and put it in |
| // the map. |
| ImportElement importElement = importDirective.element; |
| if (importElement != null) { |
| NamespaceBuilder builder = new NamespaceBuilder(); |
| namespace = builder.createImportNamespaceForDirective(importElement); |
| _namespaceMap[importDirective] = namespace; |
| } |
| } |
| return namespace; |
| } |
| |
| /** |
| * The [libraryMap] is a mapping between a library elements and a list of import |
| * directives, but when adding these mappings into the [libraryMap], this method can be |
| * used to simply add the mapping between the library element an an import directive without |
| * needing to check to see if a list needs to be created. |
| */ |
| void _putIntoLibraryMap(LibraryElement libraryElement, |
| ImportDirective importDirective) { |
| List<ImportDirective> importList = _libraryMap[libraryElement]; |
| if (importList == null) { |
| importList = new List<ImportDirective>(); |
| _libraryMap[libraryElement] = importList; |
| } |
| importList.add(importDirective); |
| } |
| |
| Object _visitIdentifier(Element element, String name) { |
| if (element == null) { |
| return null; |
| } |
| // If the element is multiply defined then call this method recursively for |
| // each of the conflicting elements. |
| if (element is MultiplyDefinedElement) { |
| MultiplyDefinedElement multiplyDefinedElement = element; |
| for (Element elt in multiplyDefinedElement.conflictingElements) { |
| _visitIdentifier(elt, name); |
| } |
| return null; |
| } else if (element is PrefixElement) { |
| List<ImportDirective> importDirectives = _prefixElementMap[element]; |
| if (importDirectives != null) { |
| for (ImportDirective importDirective in importDirectives) { |
| _unusedImports.remove(importDirective); |
| } |
| } |
| return null; |
| } else if (element.enclosingElement is! CompilationUnitElement) { |
| // Identifiers that aren't a prefix element and whose enclosing element |
| // isn't a CompilationUnit are ignored- this covers the case the |
| // identifier is a relative-reference, a reference to an identifier not |
| // imported by this library. |
| return null; |
| } |
| LibraryElement containingLibrary = element.library; |
| if (containingLibrary == null) { |
| return null; |
| } |
| // If the element is declared in the current library, return. |
| if (_currentLibrary == containingLibrary) { |
| return null; |
| } |
| List<ImportDirective> importsFromSameLibrary = |
| _libraryMap[containingLibrary]; |
| if (importsFromSameLibrary == null) { |
| return null; |
| } |
| if (importsFromSameLibrary.length == 1) { |
| // If there is only one import directive for this library, then it must be |
| // the directive that this element is imported with, remove it from the |
| // unusedImports list. |
| ImportDirective usedImportDirective = importsFromSameLibrary[0]; |
| _unusedImports.remove(usedImportDirective); |
| } else { |
| // Otherwise, for each of the imported directives, use the namespaceMap to |
| for (ImportDirective importDirective in importsFromSameLibrary) { |
| // Get the namespace for this import |
| Namespace namespace = _computeNamespace(importDirective); |
| if (namespace != null && namespace.get(name) != null) { |
| _unusedImports.remove(importDirective); |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Given some [NodeList] of [Annotation]s, ensure that the identifiers are visited by |
| * this visitor. Specifically, this covers the cases where AST nodes don't have their identifiers |
| * visited by this visitor, but still need their annotations visited. |
| * |
| * @param annotations the list of annotations to visit |
| */ |
| void _visitMetadata(NodeList<Annotation> annotations) { |
| int count = annotations.length; |
| for (int i = 0; i < count; i++) { |
| annotations[i].accept(this); |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `InheritanceManager` manage the knowledge of where class members |
| * (methods, getters & setters) are inherited from. |
| */ |
| class InheritanceManager { |
| /** |
| * The [LibraryElement] that is managed by this manager. |
| */ |
| LibraryElement _library; |
| |
| /** |
| * This is a mapping between each [ClassElement] and a map between the [String] member |
| * names and the associated [ExecutableElement] in the mixin and superclass chain. |
| */ |
| HashMap<ClassElement, MemberMap> _classLookup; |
| |
| /** |
| * This is a mapping between each [ClassElement] and a map between the [String] member |
| * names and the associated [ExecutableElement] in the interface set. |
| */ |
| HashMap<ClassElement, MemberMap> _interfaceLookup; |
| |
| /** |
| * A map between each visited [ClassElement] and the set of [AnalysisError]s found on |
| * the class element. |
| */ |
| HashMap<ClassElement, HashSet<AnalysisError>> _errorsInClassElement = |
| new HashMap<ClassElement, HashSet<AnalysisError>>(); |
| |
| /** |
| * Initialize a newly created inheritance manager. |
| * |
| * @param library the library element context that the inheritance mappings are being generated |
| */ |
| InheritanceManager(LibraryElement library) { |
| this._library = library; |
| _classLookup = new HashMap<ClassElement, MemberMap>(); |
| _interfaceLookup = new HashMap<ClassElement, MemberMap>(); |
| } |
| |
| /** |
| * Set the new library element context. |
| * |
| * @param library the new library element |
| */ |
| void set libraryElement(LibraryElement library) { |
| this._library = library; |
| } |
| |
| /** |
| * Return the set of [AnalysisError]s found on the passed [ClassElement], or |
| * `null` if there are none. |
| * |
| * @param classElt the class element to query |
| * @return the set of [AnalysisError]s found on the passed [ClassElement], or |
| * `null` if there are none |
| */ |
| HashSet<AnalysisError> getErrors(ClassElement classElt) => |
| _errorsInClassElement[classElt]; |
| |
| /** |
| * Get and return a mapping between the set of all string names of the members inherited from the |
| * passed [ClassElement] superclass hierarchy, and the associated [ExecutableElement]. |
| * |
| * @param classElt the class element to query |
| * @return a mapping between the set of all members inherited from the passed [ClassElement] |
| * superclass hierarchy, and the associated [ExecutableElement] |
| */ |
| MemberMap getMapOfMembersInheritedFromClasses(ClassElement classElt) => |
| _computeClassChainLookupMap(classElt, new HashSet<ClassElement>()); |
| |
| /** |
| * Get and return a mapping between the set of all string names of the members inherited from the |
| * passed [ClassElement] interface hierarchy, and the associated [ExecutableElement]. |
| * |
| * @param classElt the class element to query |
| * @return a mapping between the set of all string names of the members inherited from the passed |
| * [ClassElement] interface hierarchy, and the associated [ExecutableElement]. |
| */ |
| MemberMap getMapOfMembersInheritedFromInterfaces(ClassElement classElt) => |
| _computeInterfaceLookupMap(classElt, new HashSet<ClassElement>()); |
| |
| /** |
| * Given some [ClassElement] and some member name, this returns the |
| * [ExecutableElement] that the class inherits from the mixins, |
| * superclasses or interfaces, that has the member name, if no member is inherited `null` is |
| * returned. |
| * |
| * @param classElt the class element to query |
| * @param memberName the name of the executable element to find and return |
| * @return the inherited executable element with the member name, or `null` if no such |
| * member exists |
| */ |
| ExecutableElement lookupInheritance(ClassElement classElt, |
| String memberName) { |
| if (memberName == null || memberName.isEmpty) { |
| return null; |
| } |
| ExecutableElement executable = _computeClassChainLookupMap( |
| classElt, |
| new HashSet<ClassElement>()).get(memberName); |
| if (executable == null) { |
| return _computeInterfaceLookupMap( |
| classElt, |
| new HashSet<ClassElement>()).get(memberName); |
| } |
| return executable; |
| } |
| |
| /** |
| * Given some [ClassElement] and some member name, this returns the |
| * [ExecutableElement] that the class either declares itself, or |
| * inherits, that has the member name, if no member is inherited `null` is returned. |
| * |
| * @param classElt the class element to query |
| * @param memberName the name of the executable element to find and return |
| * @return the inherited executable element with the member name, or `null` if no such |
| * member exists |
| */ |
| ExecutableElement lookupMember(ClassElement classElt, String memberName) { |
| ExecutableElement element = _lookupMemberInClass(classElt, memberName); |
| if (element != null) { |
| return element; |
| } |
| return lookupInheritance(classElt, memberName); |
| } |
| |
| /** |
| * Given some [InterfaceType] and some member name, this returns the |
| * [FunctionType] of the [ExecutableElement] that the |
| * class either declares itself, or inherits, that has the member name, if no member is inherited |
| * `null` is returned. The returned [FunctionType] has all type |
| * parameters substituted with corresponding type arguments from the given [InterfaceType]. |
| * |
| * @param interfaceType the interface type to query |
| * @param memberName the name of the executable element to find and return |
| * @return the member's function type, or `null` if no such member exists |
| */ |
| FunctionType lookupMemberType(InterfaceType interfaceType, |
| String memberName) { |
| ExecutableElement iteratorMember = |
| lookupMember(interfaceType.element, memberName); |
| if (iteratorMember == null) { |
| return null; |
| } |
| return substituteTypeArgumentsInMemberFromInheritance( |
| iteratorMember.type, |
| memberName, |
| interfaceType); |
| } |
| |
| /** |
| * Determine the set of methods which is overridden by the given class member. If no member is |
| * inherited, an empty list is returned. If one of the inherited members is a |
| * [MultiplyInheritedExecutableElement], then it is expanded into its constituent inherited |
| * elements. |
| * |
| * @param classElt the class to query |
| * @param memberName the name of the class member to query |
| * @return a list of overridden methods |
| */ |
| List<ExecutableElement> lookupOverrides(ClassElement classElt, |
| String memberName) { |
| List<ExecutableElement> result = new List<ExecutableElement>(); |
| if (memberName == null || memberName.isEmpty) { |
| return result; |
| } |
| List<MemberMap> interfaceMaps = |
| _gatherInterfaceLookupMaps(classElt, new HashSet<ClassElement>()); |
| if (interfaceMaps != null) { |
| for (MemberMap interfaceMap in interfaceMaps) { |
| ExecutableElement overriddenElement = interfaceMap.get(memberName); |
| if (overriddenElement != null) { |
| if (overriddenElement is MultiplyInheritedExecutableElement) { |
| MultiplyInheritedExecutableElement multiplyInheritedElement = |
| overriddenElement; |
| for (ExecutableElement element in |
| multiplyInheritedElement.inheritedElements) { |
| result.add(element); |
| } |
| } else { |
| result.add(overriddenElement); |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * This method takes some inherited [FunctionType], and resolves all the parameterized types |
| * in the function type, dependent on the class in which it is being overridden. |
| * |
| * @param baseFunctionType the function type that is being overridden |
| * @param memberName the name of the member, this is used to lookup the inheritance path of the |
| * override |
| * @param definingType the type that is overriding the member |
| * @return the passed function type with any parameterized types substituted |
| */ |
| FunctionType |
| substituteTypeArgumentsInMemberFromInheritance(FunctionType baseFunctionType, |
| String memberName, InterfaceType definingType) { |
| // if the baseFunctionType is null, or does not have any parameters, |
| // return it. |
| if (baseFunctionType == null || |
| baseFunctionType.typeArguments.length == 0) { |
| return baseFunctionType; |
| } |
| // First, generate the path from the defining type to the overridden member |
| Queue<InterfaceType> inheritancePath = new Queue<InterfaceType>(); |
| _computeInheritancePath(inheritancePath, definingType, memberName); |
| if (inheritancePath == null || inheritancePath.isEmpty) { |
| // TODO(jwren) log analysis engine error |
| return baseFunctionType; |
| } |
| FunctionType functionTypeToReturn = baseFunctionType; |
| // loop backward through the list substituting as we go: |
| while (!inheritancePath.isEmpty) { |
| InterfaceType lastType = inheritancePath.removeLast(); |
| List<DartType> parameterTypes = lastType.element.type.typeArguments; |
| List<DartType> argumentTypes = lastType.typeArguments; |
| functionTypeToReturn = |
| functionTypeToReturn.substitute2(argumentTypes, parameterTypes); |
| } |
| return functionTypeToReturn; |
| } |
| |
| /** |
| * Compute and return a mapping between the set of all string names of the members inherited from |
| * the passed [ClassElement] superclass hierarchy, and the associated |
| * [ExecutableElement]. |
| * |
| * @param classElt the class element to query |
| * @param visitedClasses a set of visited classes passed back into this method when it calls |
| * itself recursively |
| * @return a mapping between the set of all string names of the members inherited from the passed |
| * [ClassElement] superclass hierarchy, and the associated [ExecutableElement] |
| */ |
| MemberMap _computeClassChainLookupMap(ClassElement classElt, |
| HashSet<ClassElement> visitedClasses) { |
| MemberMap resultMap = _classLookup[classElt]; |
| if (resultMap != null) { |
| return resultMap; |
| } else { |
| resultMap = new MemberMap(); |
| } |
| ClassElement superclassElt = null; |
| InterfaceType supertype = classElt.supertype; |
| if (supertype != null) { |
| superclassElt = supertype.element; |
| } else { |
| // classElt is Object |
| _classLookup[classElt] = resultMap; |
| return resultMap; |
| } |
| if (superclassElt != null) { |
| if (!visitedClasses.contains(superclassElt)) { |
| visitedClasses.add(superclassElt); |
| try { |
| resultMap = |
| new MemberMap.con2(_computeClassChainLookupMap(superclassElt, visitedClasses)); |
| // |
| // Substitute the super types down the hierarchy. |
| // |
| _substituteTypeParametersDownHierarchy(supertype, resultMap); |
| // |
| // Include the members from the superclass in the resultMap. |
| // |
| _recordMapWithClassMembers(resultMap, supertype, false); |
| } finally { |
| visitedClasses.remove(superclassElt); |
| } |
| } else { |
| // This case happens only when the superclass was previously visited and |
| // not in the lookup, meaning this is meant to shorten the compute for |
| // recursive cases. |
| _classLookup[superclassElt] = resultMap; |
| return resultMap; |
| } |
| } |
| // |
| // Include the members from the mixins in the resultMap |
| // |
| List<InterfaceType> mixins = classElt.mixins; |
| for (int i = mixins.length - 1; i >= 0; i--) { |
| ClassElement mixinElement = mixins[i].element; |
| if (mixinElement != null) { |
| if (!visitedClasses.contains(mixinElement)) { |
| visitedClasses.add(mixinElement); |
| try { |
| MemberMap map = |
| new MemberMap.con2(_computeClassChainLookupMap(mixinElement, visitedClasses)); |
| // |
| // Substitute the super types down the hierarchy. |
| // |
| _substituteTypeParametersDownHierarchy(mixins[i], map); |
| // |
| // Include the members from the superclass in the resultMap. |
| // |
| _recordMapWithClassMembers(map, mixins[i], false); |
| // |
| // Add the members from map into result map. |
| // |
| for (int j = 0; j < map.size; j++) { |
| String key = map.getKey(j); |
| ExecutableElement value = map.getValue(j); |
| if (key != null) { |
| if (resultMap.get(key) == null || |
| (resultMap.get(key) != null && !_isAbstract(value))) { |
| resultMap.put(key, value); |
| } |
| } |
| } |
| } finally { |
| visitedClasses.remove(mixinElement); |
| } |
| } else { |
| // This case happens only when the superclass was previously visited |
| // and not in the lookup, meaning this is meant to shorten the compute |
| // for recursive cases. |
| _classLookup[mixinElement] = resultMap; |
| return resultMap; |
| } |
| } |
| } |
| _classLookup[classElt] = resultMap; |
| return resultMap; |
| } |
| |
| /** |
| * Compute and return the inheritance path given the context of a type and a member that is |
| * overridden in the inheritance path (for which the type is in the path). |
| * |
| * @param chain the inheritance path that is built up as this method calls itself recursively, |
| * when this method is called an empty [LinkedList] should be provided |
| * @param currentType the current type in the inheritance path |
| * @param memberName the name of the member that is being looked up the inheritance path |
| */ |
| void _computeInheritancePath(Queue<InterfaceType> chain, |
| InterfaceType currentType, String memberName) { |
| // TODO (jwren) create a public version of this method which doesn't require |
| // the initial chain to be provided, then provided tests for this |
| // functionality in InheritanceManagerTest |
| chain.add(currentType); |
| ClassElement classElt = currentType.element; |
| InterfaceType supertype = classElt.supertype; |
| // Base case- reached Object |
| if (supertype == null) { |
| // Looked up the chain all the way to Object, return null. |
| // This should never happen. |
| return; |
| } |
| // If we are done, return the chain |
| // We are not done if this is the first recursive call on this method. |
| if (chain.length != 1) { |
| // We are done however if the member is in this classElt |
| if (_lookupMemberInClass(classElt, memberName) != null) { |
| return; |
| } |
| } |
| // Mixins- note that mixins call lookupMemberInClass, not lookupMember |
| List<InterfaceType> mixins = classElt.mixins; |
| for (int i = mixins.length - 1; i >= 0; i--) { |
| ClassElement mixinElement = mixins[i].element; |
| if (mixinElement != null) { |
| ExecutableElement elt = _lookupMemberInClass(mixinElement, memberName); |
| if (elt != null) { |
| // this is equivalent (but faster than) calling this method |
| // recursively |
| // (return computeInheritancePath(chain, mixins[i], memberName);) |
| chain.add(mixins[i]); |
| return; |
| } |
| } |
| } |
| // Superclass |
| ClassElement superclassElt = supertype.element; |
| if (lookupMember(superclassElt, memberName) != null) { |
| _computeInheritancePath(chain, supertype, memberName); |
| return; |
| } |
| // Interfaces |
| List<InterfaceType> interfaces = classElt.interfaces; |
| for (InterfaceType interfaceType in interfaces) { |
| ClassElement interfaceElement = interfaceType.element; |
| if (interfaceElement != null && |
| lookupMember(interfaceElement, memberName) != null) { |
| _computeInheritancePath(chain, interfaceType, memberName); |
| return; |
| } |
| } |
| } |
| |
| /** |
| * Compute and return a mapping between the set of all string names of the members inherited from |
| * the passed [ClassElement] interface hierarchy, and the associated |
| * [ExecutableElement]. |
| * |
| * @param classElt the class element to query |
| * @param visitedInterfaces a set of visited classes passed back into this method when it calls |
| * itself recursively |
| * @return a mapping between the set of all string names of the members inherited from the passed |
| * [ClassElement] interface hierarchy, and the associated [ExecutableElement] |
| */ |
| MemberMap _computeInterfaceLookupMap(ClassElement classElt, |
| HashSet<ClassElement> visitedInterfaces) { |
| MemberMap resultMap = _interfaceLookup[classElt]; |
| if (resultMap != null) { |
| return resultMap; |
| } |
| List<MemberMap> lookupMaps = |
| _gatherInterfaceLookupMaps(classElt, visitedInterfaces); |
| if (lookupMaps == null) { |
| resultMap = new MemberMap(); |
| } else { |
| HashMap<String, List<ExecutableElement>> unionMap = |
| _unionInterfaceLookupMaps(lookupMaps); |
| resultMap = _resolveInheritanceLookup(classElt, unionMap); |
| } |
| _interfaceLookup[classElt] = resultMap; |
| return resultMap; |
| } |
| |
| /** |
| * Collect a list of interface lookup maps whose elements correspond to all of the classes |
| * directly above [classElt] in the class hierarchy (the direct superclass if any, all |
| * mixins, and all direct superinterfaces). Each item in the list is the interface lookup map |
| * returned by [computeInterfaceLookupMap] for the corresponding super, except with type |
| * parameters appropriately substituted. |
| * |
| * @param classElt the class element to query |
| * @param visitedInterfaces a set of visited classes passed back into this method when it calls |
| * itself recursively |
| * @return `null` if there was a problem (such as a loop in the class hierarchy) or if there |
| * are no classes above this one in the class hierarchy. Otherwise, a list of interface |
| * lookup maps. |
| */ |
| List<MemberMap> _gatherInterfaceLookupMaps(ClassElement classElt, |
| HashSet<ClassElement> visitedInterfaces) { |
| InterfaceType supertype = classElt.supertype; |
| ClassElement superclassElement = |
| supertype != null ? supertype.element : null; |
| List<InterfaceType> mixins = classElt.mixins; |
| List<InterfaceType> interfaces = classElt.interfaces; |
| // Recursively collect the list of mappings from all of the interface types |
| List<MemberMap> lookupMaps = new List<MemberMap>(); |
| // |
| // Superclass element |
| // |
| if (superclassElement != null) { |
| if (!visitedInterfaces.contains(superclassElement)) { |
| try { |
| visitedInterfaces.add(superclassElement); |
| // |
| // Recursively compute the map for the super type. |
| // |
| MemberMap map = |
| _computeInterfaceLookupMap(superclassElement, visitedInterfaces); |
| map = new MemberMap.con2(map); |
| // |
| // Substitute the super type down the hierarchy. |
| // |
| _substituteTypeParametersDownHierarchy(supertype, map); |
| // |
| // Add any members from the super type into the map as well. |
| // |
| _recordMapWithClassMembers(map, supertype, true); |
| lookupMaps.add(map); |
| } finally { |
| visitedInterfaces.remove(superclassElement); |
| } |
| } else { |
| return null; |
| } |
| } |
| // |
| // Mixin elements |
| // |
| for (int i = mixins.length - 1; i >= 0; i--) { |
| InterfaceType mixinType = mixins[i]; |
| ClassElement mixinElement = mixinType.element; |
| if (mixinElement != null) { |
| if (!visitedInterfaces.contains(mixinElement)) { |
| try { |
| visitedInterfaces.add(mixinElement); |
| // |
| // Recursively compute the map for the mixin. |
| // |
| MemberMap map = |
| _computeInterfaceLookupMap(mixinElement, visitedInterfaces); |
| map = new MemberMap.con2(map); |
| // |
| // Substitute the mixin type down the hierarchy. |
| // |
| _substituteTypeParametersDownHierarchy(mixinType, map); |
| // |
| // Add any members from the mixin type into the map as well. |
| // |
| _recordMapWithClassMembers(map, mixinType, true); |
| lookupMaps.add(map); |
| } finally { |
| visitedInterfaces.remove(mixinElement); |
| } |
| } else { |
| return null; |
| } |
| } |
| } |
| // |
| // Interface elements |
| // |
| for (InterfaceType interfaceType in interfaces) { |
| ClassElement interfaceElement = interfaceType.element; |
| if (interfaceElement != null) { |
| if (!visitedInterfaces.contains(interfaceElement)) { |
| try { |
| visitedInterfaces.add(interfaceElement); |
| // |
| // Recursively compute the map for the interfaces. |
| // |
| MemberMap map = |
| _computeInterfaceLookupMap(interfaceElement, visitedInterfaces); |
| map = new MemberMap.con2(map); |
| // |
| // Substitute the supertypes down the hierarchy |
| // |
| _substituteTypeParametersDownHierarchy(interfaceType, map); |
| // |
| // And add any members from the interface into the map as well. |
| // |
| _recordMapWithClassMembers(map, interfaceType, true); |
| lookupMaps.add(map); |
| } finally { |
| visitedInterfaces.remove(interfaceElement); |
| } |
| } else { |
| return null; |
| } |
| } |
| } |
| if (lookupMaps.length == 0) { |
| return null; |
| } |
| return lookupMaps; |
| } |
| |
| /** |
| * Given some [ClassElement], this method finds and returns the [ExecutableElement] of |
| * the passed name in the class element. Static members, members in super types and members not |
| * accessible from the current library are not considered. |
| * |
| * @param classElt the class element to query |
| * @param memberName the name of the member to lookup in the class |
| * @return the found [ExecutableElement], or `null` if no such member was found |
| */ |
| ExecutableElement _lookupMemberInClass(ClassElement classElt, |
| String memberName) { |
| List<MethodElement> methods = classElt.methods; |
| for (MethodElement method in methods) { |
| if (memberName == method.name && |
| method.isAccessibleIn(_library) && |
| !method.isStatic) { |
| return method; |
| } |
| } |
| List<PropertyAccessorElement> accessors = classElt.accessors; |
| for (PropertyAccessorElement accessor in accessors) { |
| if (memberName == accessor.name && |
| accessor.isAccessibleIn(_library) && |
| !accessor.isStatic) { |
| return accessor; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Record the passed map with the set of all members (methods, getters and setters) in the type |
| * into the passed map. |
| * |
| * @param map some non-`null` map to put the methods and accessors from the passed |
| * [ClassElement] into |
| * @param type the type that will be recorded into the passed map |
| * @param doIncludeAbstract `true` if abstract members will be put into the map |
| */ |
| void _recordMapWithClassMembers(MemberMap map, InterfaceType type, |
| bool doIncludeAbstract) { |
| List<MethodElement> methods = type.methods; |
| for (MethodElement method in methods) { |
| if (method.isAccessibleIn(_library) && |
| !method.isStatic && |
| (doIncludeAbstract || !method.isAbstract)) { |
| map.put(method.name, method); |
| } |
| } |
| List<PropertyAccessorElement> accessors = type.accessors; |
| for (PropertyAccessorElement accessor in accessors) { |
| if (accessor.isAccessibleIn(_library) && |
| !accessor.isStatic && |
| (doIncludeAbstract || !accessor.isAbstract)) { |
| map.put(accessor.name, accessor); |
| } |
| } |
| } |
| |
| /** |
| * This method is used to report errors on when they are found computing inheritance information. |
| * See [ErrorVerifier.checkForInconsistentMethodInheritance] to see where these generated |
| * error codes are reported back into the analysis engine. |
| * |
| * @param classElt the location of the source for which the exception occurred |
| * @param offset the offset of the location of the error |
| * @param length the length of the location of the error |
| * @param errorCode the error code to be associated with this error |
| * @param arguments the arguments used to build the error message |
| */ |
| void _reportError(ClassElement classElt, int offset, int length, |
| ErrorCode errorCode, List<Object> arguments) { |
| HashSet<AnalysisError> errorSet = _errorsInClassElement[classElt]; |
| if (errorSet == null) { |
| errorSet = new HashSet<AnalysisError>(); |
| _errorsInClassElement[classElt] = errorSet; |
| } |
| errorSet.add( |
| new AnalysisError.con2(classElt.source, offset, length, errorCode, arguments)); |
| } |
| |
| /** |
| * Given the set of methods defined by classes above [classElt] in the class hierarchy, |
| * apply the appropriate inheritance rules to determine those methods inherited by or overridden |
| * by [classElt]. Also report static warnings |
| * [StaticTypeWarningCode.INCONSISTENT_METHOD_INHERITANCE] and |
| * [StaticWarningCode.INCONSISTENT_METHOD_INHERITANCE_GETTER_AND_METHOD] if appropriate. |
| * |
| * @param classElt the class element to query. |
| * @param unionMap a mapping from method name to the set of unique (in terms of signature) methods |
| * defined in superclasses of [classElt]. |
| * @return the inheritance lookup map for [classElt]. |
| */ |
| MemberMap _resolveInheritanceLookup(ClassElement classElt, HashMap<String, |
| List<ExecutableElement>> unionMap) { |
| MemberMap resultMap = new MemberMap(); |
| unionMap.forEach((String key, List<ExecutableElement> list) { |
| int numOfEltsWithMatchingNames = list.length; |
| if (numOfEltsWithMatchingNames == 1) { |
| // |
| // Example: class A inherits only 1 method named 'm'. |
| // Since it is the only such method, it is inherited. |
| // Another example: class A inherits 2 methods named 'm' from 2 |
| // different interfaces, but they both have the same signature, so it is |
| // the method inherited. |
| // |
| resultMap.put(key, list[0]); |
| } else { |
| // |
| // Then numOfEltsWithMatchingNames > 1, check for the warning cases. |
| // |
| bool allMethods = true; |
| bool allSetters = true; |
| bool allGetters = true; |
| for (ExecutableElement executableElement in list) { |
| if (executableElement is PropertyAccessorElement) { |
| allMethods = false; |
| if (executableElement.isSetter) { |
| allGetters = false; |
| } else { |
| allSetters = false; |
| } |
| } else { |
| allGetters = false; |
| allSetters = false; |
| } |
| } |
| // |
| // If there isn't a mixture of methods with getters, then continue, |
| // otherwise create a warning. |
| // |
| if (allMethods || allGetters || allSetters) { |
| // |
| // Compute the element whose type is the subtype of all of the other |
| // types. |
| // |
| List<ExecutableElement> elements = new List.from(list); |
| List<FunctionType> executableElementTypes = |
| new List<FunctionType>(numOfEltsWithMatchingNames); |
| for (int i = 0; i < numOfEltsWithMatchingNames; i++) { |
| executableElementTypes[i] = elements[i].type; |
| } |
| List<int> subtypesOfAllOtherTypesIndexes = new List<int>(); |
| for (int i = 0; i < numOfEltsWithMatchingNames; i++) { |
| FunctionType subtype = executableElementTypes[i]; |
| if (subtype == null) { |
| continue; |
| } |
| bool subtypeOfAllTypes = true; |
| for (int j = |
| 0; j < numOfEltsWithMatchingNames && subtypeOfAllTypes; j++) { |
| if (i != j) { |
| if (!subtype.isSubtypeOf(executableElementTypes[j])) { |
| subtypeOfAllTypes = false; |
| break; |
| } |
| } |
| } |
| if (subtypeOfAllTypes) { |
| subtypesOfAllOtherTypesIndexes.add(i); |
| } |
| } |
| // |
| // The following is split into three cases determined by the number of |
| // elements in subtypesOfAllOtherTypes |
| // |
| if (subtypesOfAllOtherTypesIndexes.length == 1) { |
| // |
| // Example: class A inherited only 2 method named 'm'. |
| // One has the function type '() -> dynamic' and one has the |
| // function type '([int]) -> dynamic'. Since the second method is a |
| // subtype of all the others, it is the inherited method. |
| // Tests: InheritanceManagerTest. |
| // test_getMapOfMembersInheritedFromInterfaces_union_oneSubtype_* |
| // |
| resultMap.put(key, elements[subtypesOfAllOtherTypesIndexes[0]]); |
| } else { |
| if (subtypesOfAllOtherTypesIndexes.isEmpty) { |
| // |
| // Determine if the current class has a method or accessor with |
| // the member name, if it does then then this class does not |
| // "inherit" from any of the supertypes. See issue 16134. |
| // |
| bool classHasMember = false; |
| if (allMethods) { |
| classHasMember = classElt.getMethod(key) != null; |
| } else { |
| List<PropertyAccessorElement> accessors = classElt.accessors; |
| for (int i = 0; i < accessors.length; i++) { |
| if (accessors[i].name == key) { |
| classHasMember = true; |
| } |
| } |
| } |
| // |
| // Example: class A inherited only 2 method named 'm'. |
| // One has the function type '() -> int' and one has the function |
| // type '() -> String'. Since neither is a subtype of the other, |
| // we create a warning, and have this class inherit nothing. |
| // |
| if (!classHasMember) { |
| String firstTwoFuntionTypesStr = |
| "${executableElementTypes[0]}, ${executableElementTypes[1]}"; |
| _reportError( |
| classElt, |
| classElt.nameOffset, |
| classElt.displayName.length, |
| StaticTypeWarningCode.INCONSISTENT_METHOD_INHERITANCE, |
| [key, firstTwoFuntionTypesStr]); |
| } |
| } else { |
| // |
| // Example: class A inherits 2 methods named 'm'. |
| // One has the function type '(int) -> dynamic' and one has the |
| // function type '(num) -> dynamic'. Since they are both a subtype |
| // of the other, a synthetic function '(dynamic) -> dynamic' is |
| // inherited. |
| // Tests: test_getMapOfMembersInheritedFromInterfaces_ |
| // union_multipleSubtypes_* |
| // |
| List<ExecutableElement> elementArrayToMerge = |
| new List<ExecutableElement>(subtypesOfAllOtherTypesIndexes.length); |
| for (int i = 0; i < elementArrayToMerge.length; i++) { |
| elementArrayToMerge[i] = |
| elements[subtypesOfAllOtherTypesIndexes[i]]; |
| } |
| ExecutableElement mergedExecutableElement = |
| _computeMergedExecutableElement(elementArrayToMerge); |
| resultMap.put(key, mergedExecutableElement); |
| } |
| } |
| } else { |
| _reportError( |
| classElt, |
| classElt.nameOffset, |
| classElt.displayName.length, |
| StaticWarningCode.INCONSISTENT_METHOD_INHERITANCE_GETTER_AND_METHOD, |
| [key]); |
| } |
| } |
| }); |
| return resultMap; |
| } |
| |
| /** |
| * Loop through all of the members in some [MemberMap], performing type parameter |
| * substitutions using a passed supertype. |
| * |
| * @param superType the supertype to substitute into the members of the [MemberMap] |
| * @param map the MemberMap to perform the substitutions on |
| */ |
| void _substituteTypeParametersDownHierarchy(InterfaceType superType, |
| MemberMap map) { |
| for (int i = 0; i < map.size; i++) { |
| ExecutableElement executableElement = map.getValue(i); |
| if (executableElement is MethodMember) { |
| executableElement = |
| MethodMember.from(executableElement as MethodMember, superType); |
| map.setValue(i, executableElement); |
| } else if (executableElement is PropertyAccessorMember) { |
| executableElement = PropertyAccessorMember.from( |
| executableElement as PropertyAccessorMember, |
| superType); |
| map.setValue(i, executableElement); |
| } |
| } |
| } |
| |
| /** |
| * Union all of the [lookupMaps] together into a single map, grouping the ExecutableElements |
| * into a list where none of the elements are equal where equality is determined by having equal |
| * function types. (We also take note too of the kind of the element: ()->int and () -> int may |
| * not be equal if one is a getter and the other is a method.) |
| * |
| * @param lookupMaps the maps to be unioned together. |
| * @return the resulting union map. |
| */ |
| HashMap<String, List<ExecutableElement>> |
| _unionInterfaceLookupMaps(List<MemberMap> lookupMaps) { |
| HashMap<String, List<ExecutableElement>> unionMap = |
| new HashMap<String, List<ExecutableElement>>(); |
| for (MemberMap lookupMap in lookupMaps) { |
| int lookupMapSize = lookupMap.size; |
| for (int i = 0; i < lookupMapSize; i++) { |
| // Get the string key, if null, break. |
| String key = lookupMap.getKey(i); |
| if (key == null) { |
| break; |
| } |
| // Get the list value out of the unionMap |
| List<ExecutableElement> list = unionMap[key]; |
| // If we haven't created such a map for this key yet, do create it and |
| // put the list entry into the unionMap. |
| if (list == null) { |
| list = new List<ExecutableElement>(); |
| unionMap[key] = list; |
| } |
| // Fetch the entry out of this lookupMap |
| ExecutableElement newExecutableElementEntry = lookupMap.getValue(i); |
| if (list.isEmpty) { |
| // If the list is empty, just the new value |
| list.add(newExecutableElementEntry); |
| } else { |
| // Otherwise, only add the newExecutableElementEntry if it isn't |
| // already in the list, this covers situation where a class inherits |
| // two methods (or two getters) that are identical. |
| bool alreadyInList = false; |
| bool isMethod1 = newExecutableElementEntry is MethodElement; |
| for (ExecutableElement executableElementInList in list) { |
| bool isMethod2 = executableElementInList is MethodElement; |
| if (isMethod1 == isMethod2 && |
| executableElementInList.type == newExecutableElementEntry.type) { |
| alreadyInList = true; |
| break; |
| } |
| } |
| if (!alreadyInList) { |
| list.add(newExecutableElementEntry); |
| } |
| } |
| } |
| } |
| return unionMap; |
| } |
| |
| /** |
| * Given some array of [ExecutableElement]s, this method creates a synthetic element as |
| * described in 8.1.1: |
| * |
| * Let <i>numberOfPositionals</i>(<i>f</i>) denote the number of positional parameters of a |
| * function <i>f</i>, and let <i>numberOfRequiredParams</i>(<i>f</i>) denote the number of |
| * required parameters of a function <i>f</i>. Furthermore, let <i>s</i> denote the set of all |
| * named parameters of the <i>m<sub>1</sub>, …, m<sub>k</sub></i>. Then let |
| * * <i>h = max(numberOfPositionals(m<sub>i</sub>)),</i> |
| * * <i>r = min(numberOfRequiredParams(m<sub>i</sub>)), for all <i>i</i>, 1 <= i <= k.</i> |
| * Then <i>I</i> has a method named <i>n</i>, with <i>r</i> required parameters of type |
| * <b>dynamic</b>, <i>h</i> positional parameters of type <b>dynamic</b>, named parameters |
| * <i>s</i> of type <b>dynamic</b> and return type <b>dynamic</b>. |
| * |
| */ |
| static ExecutableElement |
| _computeMergedExecutableElement(List<ExecutableElement> elementArrayToMerge) { |
| int h = _getNumOfPositionalParameters(elementArrayToMerge[0]); |
| int r = _getNumOfRequiredParameters(elementArrayToMerge[0]); |
| Set<String> namedParametersList = new HashSet<String>(); |
| for (int i = 1; i < elementArrayToMerge.length; i++) { |
| ExecutableElement element = elementArrayToMerge[i]; |
| int numOfPositionalParams = _getNumOfPositionalParameters(element); |
| if (h < numOfPositionalParams) { |
| h = numOfPositionalParams; |
| } |
| int numOfRequiredParams = _getNumOfRequiredParameters(element); |
| if (r > numOfRequiredParams) { |
| r = numOfRequiredParams; |
| } |
| namedParametersList.addAll(_getNamedParameterNames(element)); |
| } |
| return _createSyntheticExecutableElement( |
| elementArrayToMerge, |
| elementArrayToMerge[0].displayName, |
| r, |
| h - r, |
| new List.from(namedParametersList)); |
| } |
| |
| /** |
| * Used by [computeMergedExecutableElement] to actually create the |
| * synthetic element. |
| * |
| * @param elementArrayToMerge the array used to create the synthetic element |
| * @param name the name of the method, getter or setter |
| * @param numOfRequiredParameters the number of required parameters |
| * @param numOfPositionalParameters the number of positional parameters |
| * @param namedParameters the list of [String]s that are the named parameters |
| * @return the created synthetic element |
| */ |
| static ExecutableElement |
| _createSyntheticExecutableElement(List<ExecutableElement> elementArrayToMerge, |
| String name, int numOfRequiredParameters, int numOfPositionalParameters, |
| List<String> namedParameters) { |
| DynamicTypeImpl dynamicType = DynamicTypeImpl.instance; |
| SimpleIdentifier nameIdentifier = |
| new SimpleIdentifier(new sc.StringToken(sc.TokenType.IDENTIFIER, name, 0)); |
| ExecutableElementImpl executable; |
| if (elementArrayToMerge[0] is MethodElement) { |
| MultiplyInheritedMethodElementImpl unionedMethod = |
| new MultiplyInheritedMethodElementImpl(nameIdentifier); |
| unionedMethod.inheritedElements = elementArrayToMerge; |
| executable = unionedMethod; |
| } else { |
| MultiplyInheritedPropertyAccessorElementImpl unionedPropertyAccessor = |
| new MultiplyInheritedPropertyAccessorElementImpl(nameIdentifier); |
| unionedPropertyAccessor.getter = |
| (elementArrayToMerge[0] as PropertyAccessorElement).isGetter; |
| unionedPropertyAccessor.setter = |
| (elementArrayToMerge[0] as PropertyAccessorElement).isSetter; |
| unionedPropertyAccessor.inheritedElements = elementArrayToMerge; |
| executable = unionedPropertyAccessor; |
| } |
| int numOfParameters = |
| numOfRequiredParameters + |
| numOfPositionalParameters + |
| namedParameters.length; |
| List<ParameterElement> parameters = |
| new List<ParameterElement>(numOfParameters); |
| int i = 0; |
| for (int j = 0; j < numOfRequiredParameters; j++, i++) { |
| ParameterElementImpl parameter = new ParameterElementImpl("", 0); |
| parameter.type = dynamicType; |
| parameter.parameterKind = ParameterKind.REQUIRED; |
| parameters[i] = parameter; |
| } |
| for (int k = 0; k < numOfPositionalParameters; k++, i++) { |
| ParameterElementImpl parameter = new ParameterElementImpl("", 0); |
| parameter.type = dynamicType; |
| parameter.parameterKind = ParameterKind.POSITIONAL; |
| parameters[i] = parameter; |
| } |
| for (int m = 0; m < namedParameters.length; m++, i++) { |
| ParameterElementImpl parameter = |
| new ParameterElementImpl(namedParameters[m], 0); |
| parameter.type = dynamicType; |
| parameter.parameterKind = ParameterKind.NAMED; |
| parameters[i] = parameter; |
| } |
| executable.returnType = dynamicType; |
| executable.parameters = parameters; |
| FunctionTypeImpl methodType = new FunctionTypeImpl.con1(executable); |
| executable.type = methodType; |
| return executable; |
| } |
| |
| /** |
| * Given some [ExecutableElement], return the list of named parameters. |
| */ |
| static List<String> |
| _getNamedParameterNames(ExecutableElement executableElement) { |
| List<String> namedParameterNames = new List<String>(); |
| List<ParameterElement> parameters = executableElement.parameters; |
| for (int i = 0; i < parameters.length; i++) { |
| ParameterElement parameterElement = parameters[i]; |
| if (parameterElement.parameterKind == ParameterKind.NAMED) { |
| namedParameterNames.add(parameterElement.name); |
| } |
| } |
| return namedParameterNames; |
| } |
| |
| /** |
| * Given some [ExecutableElement] return the number of parameters of the specified kind. |
| */ |
| static int _getNumOfParameters(ExecutableElement executableElement, |
| ParameterKind parameterKind) { |
| int parameterCount = 0; |
| List<ParameterElement> parameters = executableElement.parameters; |
| for (int i = 0; i < parameters.length; i++) { |
| ParameterElement parameterElement = parameters[i]; |
| if (parameterElement.parameterKind == parameterKind) { |
| parameterCount++; |
| } |
| } |
| return parameterCount; |
| } |
| |
| /** |
| * Given some [ExecutableElement] return the number of positional parameters. |
| * |
| * Note: by positional we mean [ParameterKind.REQUIRED] or [ParameterKind.POSITIONAL]. |
| */ |
| static int |
| _getNumOfPositionalParameters(ExecutableElement executableElement) => |
| _getNumOfParameters(executableElement, ParameterKind.REQUIRED) + |
| _getNumOfParameters(executableElement, ParameterKind.POSITIONAL); |
| |
| /** |
| * Given some [ExecutableElement] return the number of required parameters. |
| */ |
| static int _getNumOfRequiredParameters(ExecutableElement executableElement) => |
| _getNumOfParameters(executableElement, ParameterKind.REQUIRED); |
| |
| /** |
| * Given some [ExecutableElement] returns `true` if it is an abstract member of a |
| * class. |
| * |
| * @param executableElement some [ExecutableElement] to evaluate |
| * @return `true` if the given element is an abstract member of a class |
| */ |
| static bool _isAbstract(ExecutableElement executableElement) { |
| if (executableElement is MethodElement) { |
| return executableElement.isAbstract; |
| } else if (executableElement is PropertyAccessorElement) { |
| return executableElement.isAbstract; |
| } |
| return false; |
| } |
| } |
| |
| /** |
| * This enum holds one of four states of a field initialization state through a constructor |
| * signature, not initialized, initialized in the field declaration, initialized in the field |
| * formal, and finally, initialized in the initializers list. |
| */ |
| class INIT_STATE extends Enum<INIT_STATE> { |
| static const INIT_STATE NOT_INIT = const INIT_STATE('NOT_INIT', 0); |
| |
| static const INIT_STATE INIT_IN_DECLARATION = |
| const INIT_STATE('INIT_IN_DECLARATION', 1); |
| |
| static const INIT_STATE INIT_IN_FIELD_FORMAL = |
| const INIT_STATE('INIT_IN_FIELD_FORMAL', 2); |
| |
| static const INIT_STATE INIT_IN_INITIALIZERS = |
| const INIT_STATE('INIT_IN_INITIALIZERS', 3); |
| |
| static const List<INIT_STATE> values = const [ |
| NOT_INIT, |
| INIT_IN_DECLARATION, |
| INIT_IN_FIELD_FORMAL, |
| INIT_IN_INITIALIZERS]; |
| |
| const INIT_STATE(String name, int ordinal) : super(name, ordinal); |
| } |
| |
| /** |
| * Instances of the class `LabelScope` represent a scope in which a single label is defined. |
| */ |
| class LabelScope { |
| /** |
| * The label scope enclosing this label scope. |
| */ |
| final LabelScope _outerScope; |
| |
| /** |
| * The label defined in this scope. |
| */ |
| final String _label; |
| |
| /** |
| * The element to which the label resolves. |
| */ |
| final LabelElement element; |
| |
| /** |
| * The AST node to which the label resolves. |
| */ |
| final AstNode node; |
| |
| /** |
| * Initialize a newly created scope to represent the label [_label]. |
| * [_outerScope] is the scope enclosing the new label scope. [node] is the |
| * AST node the label resolves to. [element] is the element the label |
| * resolves to. |
| */ |
| LabelScope(this._outerScope, this._label, this.node, this.element); |
| |
| /** |
| * Return the LabelScope which defines [targetLabel], or `null` if it is not |
| * defined in this scope. |
| */ |
| LabelScope lookup(String targetLabel) { |
| if (_label == targetLabel) { |
| return this; |
| } else if (_outerScope != null) { |
| return _outerScope.lookup(targetLabel); |
| } else { |
| return null; |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `Library` represent the data about a single library during the |
| * resolution of some (possibly different) library. They are not intended to be used except during |
| * the resolution process. |
| */ |
| class Library { |
| /** |
| * An empty list that can be used to initialize lists of libraries. |
| */ |
| static const List<Library> _EMPTY_ARRAY = const <Library>[]; |
| |
| /** |
| * The prefix of a URI using the dart-ext scheme to reference a native code library. |
| */ |
| static String _DART_EXT_SCHEME = "dart-ext:"; |
| |
| /** |
| * The analysis context in which this library is being analyzed. |
| */ |
| final InternalAnalysisContext _analysisContext; |
| |
| /** |
| * The inheritance manager which is used for this member lookups in this library. |
| */ |
| InheritanceManager _inheritanceManager; |
| |
| /** |
| * The listener to which analysis errors will be reported. |
| */ |
| final AnalysisErrorListener _errorListener; |
| |
| /** |
| * The source specifying the defining compilation unit of this library. |
| */ |
| final Source librarySource; |
| |
| /** |
| * The library element representing this library. |
| */ |
| LibraryElementImpl _libraryElement; |
| |
| /** |
| * A list containing all of the libraries that are imported into this library. |
| */ |
| List<Library> _importedLibraries = _EMPTY_ARRAY; |
| |
| /** |
| * A table mapping URI-based directive to the actual URI value. |
| */ |
| HashMap<UriBasedDirective, String> _directiveUris = |
| new HashMap<UriBasedDirective, String>(); |
| |
| /** |
| * A flag indicating whether this library explicitly imports core. |
| */ |
| bool explicitlyImportsCore = false; |
| |
| /** |
| * A list containing all of the libraries that are exported from this library. |
| */ |
| List<Library> _exportedLibraries = _EMPTY_ARRAY; |
| |
| /** |
| * A table mapping the sources for the compilation units in this library to their corresponding |
| * AST structures. |
| */ |
| HashMap<Source, CompilationUnit> _astMap = |
| new HashMap<Source, CompilationUnit>(); |
| |
| /** |
| * The library scope used when resolving elements within this library's compilation units. |
| */ |
| LibraryScope _libraryScope; |
| |
| /** |
| * Initialize a newly created data holder that can maintain the data associated with a library. |
| * |
| * @param analysisContext the analysis context in which this library is being analyzed |
| * @param errorListener the listener to which analysis errors will be reported |
| * @param librarySource the source specifying the defining compilation unit of this library |
| */ |
| Library(this._analysisContext, this._errorListener, this.librarySource) { |
| this._libraryElement = |
| _analysisContext.getLibraryElement(librarySource) as LibraryElementImpl; |
| } |
| |
| /** |
| * Return an array of the [CompilationUnit]s that make up the library. The first unit is |
| * always the defining unit. |
| * |
| * @return an array of the [CompilationUnit]s that make up the library. The first unit is |
| * always the defining unit |
| */ |
| List<CompilationUnit> get compilationUnits { |
| List<CompilationUnit> unitArrayList = new List<CompilationUnit>(); |
| unitArrayList.add(definingCompilationUnit); |
| for (Source source in _astMap.keys.toSet()) { |
| if (librarySource != source) { |
| unitArrayList.add(getAST(source)); |
| } |
| } |
| return unitArrayList; |
| } |
| |
| /** |
| * Return a collection containing the sources for the compilation units in this library, including |
| * the defining compilation unit. |
| * |
| * @return the sources for the compilation units in this library |
| */ |
| Set<Source> get compilationUnitSources => _astMap.keys.toSet(); |
| |
| /** |
| * Return the AST structure associated with the defining compilation unit for this library. |
| * |
| * @return the AST structure associated with the defining compilation unit for this library |
| * @throws AnalysisException if an AST structure could not be created for the defining compilation |
| * unit |
| */ |
| CompilationUnit get definingCompilationUnit => getAST(librarySource); |
| |
| /** |
| * Set the libraries that are exported by this library to be those in the given array. |
| * |
| * @param exportedLibraries the libraries that are exported by this library |
| */ |
| void set exportedLibraries(List<Library> exportedLibraries) { |
| this._exportedLibraries = exportedLibraries; |
| } |
| |
| /** |
| * Return an array containing the libraries that are exported from this library. |
| * |
| * @return an array containing the libraries that are exported from this library |
| */ |
| List<Library> get exports => _exportedLibraries; |
| |
| /** |
| * Set the libraries that are imported into this library to be those in the given array. |
| * |
| * @param importedLibraries the libraries that are imported into this library |
| */ |
| void set importedLibraries(List<Library> importedLibraries) { |
| this._importedLibraries = importedLibraries; |
| } |
| |
| /** |
| * Return an array containing the libraries that are imported into this library. |
| * |
| * @return an array containing the libraries that are imported into this library |
| */ |
| List<Library> get imports => _importedLibraries; |
| |
| /** |
| * Return an array containing the libraries that are either imported or exported from this |
| * library. |
| * |
| * @return the libraries that are either imported or exported from this library |
| */ |
| List<Library> get importsAndExports { |
| HashSet<Library> libraries = new HashSet<Library>(); |
| for (Library library in _importedLibraries) { |
| libraries.add(library); |
| } |
| for (Library library in _exportedLibraries) { |
| libraries.add(library); |
| } |
| return new List.from(libraries); |
| } |
| |
| /** |
| * Return the inheritance manager for this library. |
| * |
| * @return the inheritance manager for this library |
| */ |
| InheritanceManager get inheritanceManager { |
| if (_inheritanceManager == null) { |
| return _inheritanceManager = new InheritanceManager(_libraryElement); |
| } |
| return _inheritanceManager; |
| } |
| |
| /** |
| * Return the library element representing this library, creating it if necessary. |
| * |
| * @return the library element representing this library |
| */ |
| LibraryElementImpl get libraryElement { |
| if (_libraryElement == null) { |
| try { |
| _libraryElement = |
| _analysisContext.computeLibraryElement(librarySource) as LibraryElementImpl; |
| } on AnalysisException catch (exception, stackTrace) { |
| AnalysisEngine.instance.logger.logError( |
| "Could not compute library element for ${librarySource.fullName}", |
| new CaughtException(exception, stackTrace)); |
| } |
| } |
| return _libraryElement; |
| } |
| |
| /** |
| * Set the library element representing this library to the given library element. |
| * |
| * @param libraryElement the library element representing this library |
| */ |
| void set libraryElement(LibraryElementImpl libraryElement) { |
| this._libraryElement = libraryElement; |
| if (_inheritanceManager != null) { |
| _inheritanceManager.libraryElement = libraryElement; |
| } |
| } |
| |
| /** |
| * Return the library scope used when resolving elements within this library's compilation units. |
| * |
| * @return the library scope used when resolving elements within this library's compilation units |
| */ |
| LibraryScope get libraryScope { |
| if (_libraryScope == null) { |
| _libraryScope = new LibraryScope(_libraryElement, _errorListener); |
| } |
| return _libraryScope; |
| } |
| |
| /** |
| * Return the AST structure associated with the given source. |
| * |
| * @param source the source representing the compilation unit whose AST is to be returned |
| * @return the AST structure associated with the given source |
| * @throws AnalysisException if an AST structure could not be created for the compilation unit |
| */ |
| CompilationUnit getAST(Source source) { |
| CompilationUnit unit = _astMap[source]; |
| if (unit == null) { |
| unit = _analysisContext.computeResolvableCompilationUnit(source); |
| _astMap[source] = unit; |
| } |
| return unit; |
| } |
| |
| /** |
| * Return the result of resolving the URI of the given URI-based directive against the URI of the |
| * library, or `null` if the URI is not valid. If the URI is not valid, report the error. |
| * |
| * @param directive the directive which URI should be resolved |
| * @return the result of resolving the URI against the URI of the library |
| */ |
| Source getSource(UriBasedDirective directive) { |
| StringLiteral uriLiteral = directive.uri; |
| if (uriLiteral is StringInterpolation) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| librarySource, |
| uriLiteral.offset, |
| uriLiteral.length, |
| CompileTimeErrorCode.URI_WITH_INTERPOLATION)); |
| return null; |
| } |
| String uriContent = uriLiteral.stringValue.trim(); |
| _directiveUris[directive] = uriContent; |
| uriContent = Uri.encodeFull(uriContent); |
| if (directive is ImportDirective && |
| uriContent.startsWith(_DART_EXT_SCHEME)) { |
| _libraryElement.hasExtUri = true; |
| return null; |
| } |
| try { |
| parseUriWithException(uriContent); |
| Source source = |
| _analysisContext.sourceFactory.resolveUri(librarySource, uriContent); |
| if (!_analysisContext.exists(source)) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| librarySource, |
| uriLiteral.offset, |
| uriLiteral.length, |
| CompileTimeErrorCode.URI_DOES_NOT_EXIST, |
| [uriContent])); |
| } |
| return source; |
| } on URISyntaxException catch (exception) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| librarySource, |
| uriLiteral.offset, |
| uriLiteral.length, |
| CompileTimeErrorCode.INVALID_URI, |
| [uriContent])); |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the URI value of the given directive. |
| */ |
| String getUri(UriBasedDirective directive) => _directiveUris[directive]; |
| |
| /** |
| * Set the AST structure associated with the defining compilation unit for this library to the |
| * given AST structure. |
| * |
| * @param unit the AST structure associated with the defining compilation unit for this library |
| */ |
| void setDefiningCompilationUnit(CompilationUnit unit) { |
| _astMap[librarySource] = unit; |
| } |
| |
| @override |
| String toString() => librarySource.shortName; |
| } |
| |
| /** |
| * Instances of the class `LibraryElementBuilder` build an element model for a single library. |
| */ |
| class LibraryElementBuilder { |
| /** |
| * The name of the function used as an entry point. |
| */ |
| static String ENTRY_POINT_NAME = "main"; |
| |
| /** |
| * The analysis context in which the element model will be built. |
| */ |
| final InternalAnalysisContext _analysisContext; |
| |
| /** |
| * The listener to which errors will be reported. |
| */ |
| final AnalysisErrorListener _errorListener; |
| |
| /** |
| * Initialize a newly created library element builder. |
| * |
| * @param analysisContext the analysis context in which the element model will be built |
| * @param errorListener the listener to which errors will be reported |
| */ |
| LibraryElementBuilder(this._analysisContext, this._errorListener); |
| |
| /** |
| * Build the library element for the given library. |
| * |
| * @param library the library for which an element model is to be built |
| * @return the library element that was built |
| * @throws AnalysisException if the analysis could not be performed |
| */ |
| LibraryElementImpl buildLibrary(Library library) { |
| CompilationUnitBuilder builder = new CompilationUnitBuilder(); |
| Source librarySource = library.librarySource; |
| CompilationUnit definingCompilationUnit = library.definingCompilationUnit; |
| CompilationUnitElementImpl definingCompilationUnitElement = |
| builder.buildCompilationUnit(librarySource, definingCompilationUnit); |
| NodeList<Directive> directives = definingCompilationUnit.directives; |
| LibraryIdentifier libraryNameNode = null; |
| bool hasPartDirective = false; |
| FunctionElement entryPoint = |
| _findEntryPoint(definingCompilationUnitElement); |
| List<Directive> directivesToResolve = new List<Directive>(); |
| List<CompilationUnitElementImpl> sourcedCompilationUnits = |
| new List<CompilationUnitElementImpl>(); |
| for (Directive directive in directives) { |
| // |
| // We do not build the elements representing the import and export |
| // directives at this point. That is not done until we get to |
| // LibraryResolver.buildDirectiveModels() because we need the |
| // LibraryElements for the referenced libraries, which might not exist at |
| // this point (due to the possibility of circular references). |
| // |
| if (directive is LibraryDirective) { |
| if (libraryNameNode == null) { |
| libraryNameNode = directive.name; |
| directivesToResolve.add(directive); |
| } |
| } else if (directive is PartDirective) { |
| PartDirective partDirective = directive; |
| StringLiteral partUri = partDirective.uri; |
| Source partSource = partDirective.source; |
| if (_analysisContext.exists(partSource)) { |
| hasPartDirective = true; |
| CompilationUnit partUnit = library.getAST(partSource); |
| CompilationUnitElementImpl part = |
| builder.buildCompilationUnit(partSource, partUnit); |
| part.uriOffset = partUri.offset; |
| part.uriEnd = partUri.end; |
| part.uri = partDirective.uriContent; |
| // |
| // Validate that the part contains a part-of directive with the same |
| // name as the library. |
| // |
| String partLibraryName = |
| _getPartLibraryName(partSource, partUnit, directivesToResolve); |
| if (partLibraryName == null) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| librarySource, |
| partUri.offset, |
| partUri.length, |
| CompileTimeErrorCode.PART_OF_NON_PART, |
| [partUri.toSource()])); |
| } else if (libraryNameNode == null) { |
| // TODO(brianwilkerson) Collect the names declared by the part. |
| // If they are all the same then we can use that name as the |
| // inferred name of the library and present it in a quick-fix. |
| // partLibraryNames.add(partLibraryName); |
| } else if (libraryNameNode.name != partLibraryName) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| librarySource, |
| partUri.offset, |
| partUri.length, |
| StaticWarningCode.PART_OF_DIFFERENT_LIBRARY, |
| [libraryNameNode.name, partLibraryName])); |
| } |
| if (entryPoint == null) { |
| entryPoint = _findEntryPoint(part); |
| } |
| directive.element = part; |
| sourcedCompilationUnits.add(part); |
| } |
| } |
| } |
| if (hasPartDirective && libraryNameNode == null) { |
| _errorListener.onError( |
| new AnalysisError.con1( |
| librarySource, |
| ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART)); |
| } |
| // |
| // Create and populate the library element. |
| // |
| LibraryElementImpl libraryElement = new LibraryElementImpl.forNode( |
| _analysisContext.getContextFor(librarySource), |
| libraryNameNode); |
| libraryElement.definingCompilationUnit = definingCompilationUnitElement; |
| if (entryPoint != null) { |
| libraryElement.entryPoint = entryPoint; |
| } |
| int sourcedUnitCount = sourcedCompilationUnits.length; |
| libraryElement.parts = sourcedCompilationUnits; |
| for (Directive directive in directivesToResolve) { |
| directive.element = libraryElement; |
| } |
| library.libraryElement = libraryElement; |
| if (sourcedUnitCount > 0) { |
| _patchTopLevelAccessors(libraryElement); |
| } |
| return libraryElement; |
| } |
| |
| /** |
| * Build the library element for the given library. The resulting element is |
| * stored in the [ResolvableLibrary] structure. |
| * |
| * @param library the library for which an element model is to be built |
| * @throws AnalysisException if the analysis could not be performed |
| */ |
| void buildLibrary2(ResolvableLibrary library) { |
| CompilationUnitBuilder builder = new CompilationUnitBuilder(); |
| Source librarySource = library.librarySource; |
| CompilationUnit definingCompilationUnit = library.definingCompilationUnit; |
| CompilationUnitElementImpl definingCompilationUnitElement = |
| builder.buildCompilationUnit(librarySource, definingCompilationUnit); |
| NodeList<Directive> directives = definingCompilationUnit.directives; |
| LibraryIdentifier libraryNameNode = null; |
| bool hasPartDirective = false; |
| FunctionElement entryPoint = |
| _findEntryPoint(definingCompilationUnitElement); |
| List<Directive> directivesToResolve = new List<Directive>(); |
| List<CompilationUnitElementImpl> sourcedCompilationUnits = |
| new List<CompilationUnitElementImpl>(); |
| for (Directive directive in directives) { |
| // |
| // We do not build the elements representing the import and export |
| // directives at this point. That is not done until we get to |
| // LibraryResolver.buildDirectiveModels() because we need the |
| // LibraryElements for the referenced libraries, which might not exist at |
| // this point (due to the possibility of circular references). |
| // |
| if (directive is LibraryDirective) { |
| if (libraryNameNode == null) { |
| libraryNameNode = directive.name; |
| directivesToResolve.add(directive); |
| } |
| } else if (directive is PartDirective) { |
| PartDirective partDirective = directive; |
| StringLiteral partUri = partDirective.uri; |
| Source partSource = partDirective.source; |
| if (_analysisContext.exists(partSource)) { |
| hasPartDirective = true; |
| CompilationUnit partUnit = library.getAST(partSource); |
| if (partUnit != null) { |
| CompilationUnitElementImpl part = |
| builder.buildCompilationUnit(partSource, partUnit); |
| part.uriOffset = partUri.offset; |
| part.uriEnd = partUri.end; |
| part.uri = partDirective.uriContent; |
| // |
| // Validate that the part contains a part-of directive with the same |
| // name as the library. |
| // |
| String partLibraryName = |
| _getPartLibraryName(partSource, partUnit, directivesToResolve); |
| if (partLibraryName == null) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| librarySource, |
| partUri.offset, |
| partUri.length, |
| CompileTimeErrorCode.PART_OF_NON_PART, |
| [partUri.toSource()])); |
| } else if (libraryNameNode == null) { |
| // TODO(brianwilkerson) Collect the names declared by the part. |
| // If they are all the same then we can use that name as the |
| // inferred name of the library and present it in a quick-fix. |
| // partLibraryNames.add(partLibraryName); |
| } else if (libraryNameNode.name != partLibraryName) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| librarySource, |
| partUri.offset, |
| partUri.length, |
| StaticWarningCode.PART_OF_DIFFERENT_LIBRARY, |
| [libraryNameNode.name, partLibraryName])); |
| } |
| if (entryPoint == null) { |
| entryPoint = _findEntryPoint(part); |
| } |
| directive.element = part; |
| sourcedCompilationUnits.add(part); |
| } |
| } |
| } |
| } |
| if (hasPartDirective && libraryNameNode == null) { |
| _errorListener.onError( |
| new AnalysisError.con1( |
| librarySource, |
| ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART)); |
| } |
| // |
| // Create and populate the library element. |
| // |
| LibraryElementImpl libraryElement = new LibraryElementImpl.forNode( |
| _analysisContext.getContextFor(librarySource), |
| libraryNameNode); |
| libraryElement.definingCompilationUnit = definingCompilationUnitElement; |
| if (entryPoint != null) { |
| libraryElement.entryPoint = entryPoint; |
| } |
| int sourcedUnitCount = sourcedCompilationUnits.length; |
| libraryElement.parts = sourcedCompilationUnits; |
| for (Directive directive in directivesToResolve) { |
| directive.element = libraryElement; |
| } |
| library.libraryElement = libraryElement; |
| if (sourcedUnitCount > 0) { |
| _patchTopLevelAccessors(libraryElement); |
| } |
| } |
| |
| /** |
| * Add all of the non-synthetic getters and setters defined in the given compilation unit that |
| * have no corresponding accessor to one of the given collections. |
| * |
| * @param getters the map to which getters are to be added |
| * @param setters the list to which setters are to be added |
| * @param unit the compilation unit defining the accessors that are potentially being added |
| */ |
| void _collectAccessors(HashMap<String, PropertyAccessorElement> getters, |
| List<PropertyAccessorElement> setters, CompilationUnitElement unit) { |
| for (PropertyAccessorElement accessor in unit.accessors) { |
| if (accessor.isGetter) { |
| if (!accessor.isSynthetic && accessor.correspondingSetter == null) { |
| getters[accessor.displayName] = accessor; |
| } |
| } else { |
| if (!accessor.isSynthetic && accessor.correspondingGetter == null) { |
| setters.add(accessor); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Search the top-level functions defined in the given compilation unit for the entry point. |
| * |
| * @param element the compilation unit to be searched |
| * @return the entry point that was found, or `null` if the compilation unit does not define |
| * an entry point |
| */ |
| FunctionElement _findEntryPoint(CompilationUnitElementImpl element) { |
| for (FunctionElement function in element.functions) { |
| if (function.name == ENTRY_POINT_NAME) { |
| return function; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Return the name of the library that the given part is declared to be a part of, or `null` |
| * if the part does not contain a part-of directive. |
| * |
| * @param partSource the source representing the part |
| * @param partUnit the AST structure of the part |
| * @param directivesToResolve a list of directives that should be resolved to the library being |
| * built |
| * @return the name of the library that the given part is declared to be a part of |
| */ |
| String _getPartLibraryName(Source partSource, CompilationUnit partUnit, |
| List<Directive> directivesToResolve) { |
| for (Directive directive in partUnit.directives) { |
| if (directive is PartOfDirective) { |
| directivesToResolve.add(directive); |
| LibraryIdentifier libraryName = directive.libraryName; |
| if (libraryName != null) { |
| return libraryName.name; |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Look through all of the compilation units defined for the given library, looking for getters |
| * and setters that are defined in different compilation units but that have the same names. If |
| * any are found, make sure that they have the same variable element. |
| * |
| * @param libraryElement the library defining the compilation units to be processed |
| */ |
| void _patchTopLevelAccessors(LibraryElementImpl libraryElement) { |
| HashMap<String, PropertyAccessorElement> getters = |
| new HashMap<String, PropertyAccessorElement>(); |
| List<PropertyAccessorElement> setters = new List<PropertyAccessorElement>(); |
| _collectAccessors(getters, setters, libraryElement.definingCompilationUnit); |
| for (CompilationUnitElement unit in libraryElement.parts) { |
| _collectAccessors(getters, setters, unit); |
| } |
| for (PropertyAccessorElement setter in setters) { |
| PropertyAccessorElement getter = getters[setter.displayName]; |
| if (getter != null) { |
| PropertyInducingElementImpl variable = |
| getter.variable as PropertyInducingElementImpl; |
| variable.setter = setter; |
| (setter as PropertyAccessorElementImpl).variable = variable; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `LibraryImportScope` represent the scope containing all of the names |
| * available from imported libraries. |
| */ |
| class LibraryImportScope extends Scope { |
| /** |
| * The element representing the library in which this scope is enclosed. |
| */ |
| final LibraryElement _definingLibrary; |
| |
| /** |
| * The listener that is to be informed when an error is encountered. |
| */ |
| final AnalysisErrorListener errorListener; |
| |
| /** |
| * A list of the namespaces representing the names that are available in this scope from imported |
| * libraries. |
| */ |
| List<Namespace> _importedNamespaces; |
| |
| /** |
| * Initialize a newly created scope representing the names imported into the given library. |
| * |
| * @param definingLibrary the element representing the library that imports the names defined in |
| * this scope |
| * @param errorListener the listener that is to be informed when an error is encountered |
| */ |
| LibraryImportScope(this._definingLibrary, this.errorListener) { |
| _createImportedNamespaces(); |
| } |
| |
| @override |
| void define(Element element) { |
| if (!Scope.isPrivateName(element.displayName)) { |
| super.define(element); |
| } |
| } |
| |
| @override |
| Source getSource(AstNode node) { |
| Source source = super.getSource(node); |
| if (source == null) { |
| source = _definingLibrary.definingCompilationUnit.source; |
| } |
| return source; |
| } |
| |
| @override |
| Element internalLookup(Identifier identifier, String name, |
| LibraryElement referencingLibrary) { |
| Element foundElement = localLookup(name, referencingLibrary); |
| if (foundElement != null) { |
| return foundElement; |
| } |
| for (int i = 0; i < _importedNamespaces.length; i++) { |
| Namespace nameSpace = _importedNamespaces[i]; |
| Element element = nameSpace.get(name); |
| if (element != null) { |
| if (foundElement == null) { |
| foundElement = element; |
| } else if (!identical(foundElement, element)) { |
| foundElement = MultiplyDefinedElementImpl.fromElements( |
| _definingLibrary.context, |
| foundElement, |
| element); |
| } |
| } |
| } |
| if (foundElement is MultiplyDefinedElementImpl) { |
| foundElement = _removeSdkElements( |
| identifier, |
| name, |
| foundElement as MultiplyDefinedElementImpl); |
| } |
| if (foundElement is MultiplyDefinedElementImpl) { |
| String foundEltName = foundElement.displayName; |
| List<Element> conflictingMembers = |
| (foundElement as MultiplyDefinedElementImpl).conflictingElements; |
| int count = conflictingMembers.length; |
| List<String> libraryNames = new List<String>(count); |
| for (int i = 0; i < count; i++) { |
| libraryNames[i] = _getLibraryName(conflictingMembers[i]); |
| } |
| libraryNames.sort(); |
| errorListener.onError( |
| new AnalysisError.con2( |
| getSource(identifier), |
| identifier.offset, |
| identifier.length, |
| StaticWarningCode.AMBIGUOUS_IMPORT, |
| [foundEltName, StringUtilities.printListOfQuotedNames(libraryNames)])); |
| return foundElement; |
| } |
| if (foundElement != null) { |
| defineNameWithoutChecking(name, foundElement); |
| } |
| return foundElement; |
| } |
| |
| /** |
| * Create all of the namespaces associated with the libraries imported into this library. The |
| * names are not added to this scope, but are stored for later reference. |
| * |
| * @param definingLibrary the element representing the library that imports the libraries for |
| * which namespaces will be created |
| */ |
| void _createImportedNamespaces() { |
| NamespaceBuilder builder = new NamespaceBuilder(); |
| List<ImportElement> imports = _definingLibrary.imports; |
| int count = imports.length; |
| _importedNamespaces = new List<Namespace>(count); |
| for (int i = 0; i < count; i++) { |
| _importedNamespaces[i] = |
| builder.createImportNamespaceForDirective(imports[i]); |
| } |
| } |
| |
| /** |
| * Returns the name of the library that defines given element. |
| * |
| * @param element the element to get library name |
| * @return the name of the library that defines given element |
| */ |
| String _getLibraryName(Element element) { |
| if (element == null) { |
| return StringUtilities.EMPTY; |
| } |
| LibraryElement library = element.library; |
| if (library == null) { |
| return StringUtilities.EMPTY; |
| } |
| List<ImportElement> imports = _definingLibrary.imports; |
| int count = imports.length; |
| for (int i = 0; i < count; i++) { |
| if (identical(imports[i].importedLibrary, library)) { |
| return library.definingCompilationUnit.displayName; |
| } |
| } |
| List<String> indirectSources = new List<String>(); |
| for (int i = 0; i < count; i++) { |
| LibraryElement importedLibrary = imports[i].importedLibrary; |
| if (importedLibrary != null) { |
| for (LibraryElement exportedLibrary in |
| importedLibrary.exportedLibraries) { |
| if (identical(exportedLibrary, library)) { |
| indirectSources.add( |
| importedLibrary.definingCompilationUnit.displayName); |
| } |
| } |
| } |
| } |
| int indirectCount = indirectSources.length; |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write(library.definingCompilationUnit.displayName); |
| if (indirectCount > 0) { |
| buffer.write(" (via "); |
| if (indirectCount > 1) { |
| indirectSources.sort(); |
| buffer.write(StringUtilities.printListOfQuotedNames(indirectSources)); |
| } else { |
| buffer.write(indirectSources[0]); |
| } |
| buffer.write(")"); |
| } |
| return buffer.toString(); |
| } |
| |
| /** |
| * Given a collection of elements that a single name could all be mapped to, remove from the list |
| * all of the names defined in the SDK. Return the element(s) that remain. |
| * |
| * @param identifier the identifier node to lookup element for, used to report correct kind of a |
| * problem and associate problem with |
| * @param name the name associated with the element |
| * @param foundElement the element encapsulating the collection of elements |
| * @return all of the elements that are not defined in the SDK |
| */ |
| Element _removeSdkElements(Identifier identifier, String name, |
| MultiplyDefinedElementImpl foundElement) { |
| List<Element> conflictingMembers = foundElement.conflictingElements; |
| int length = conflictingMembers.length; |
| int to = 0; |
| Element sdkElement = null; |
| for (Element member in conflictingMembers) { |
| if (member.library.isInSdk) { |
| sdkElement = member; |
| } else { |
| conflictingMembers[to++] = member; |
| } |
| } |
| if (sdkElement != null && to > 0) { |
| String sdkLibName = _getLibraryName(sdkElement); |
| String otherLibName = _getLibraryName(conflictingMembers[0]); |
| errorListener.onError( |
| new AnalysisError.con2( |
| getSource(identifier), |
| identifier.offset, |
| identifier.length, |
| StaticWarningCode.CONFLICTING_DART_IMPORT, |
| [name, sdkLibName, otherLibName])); |
| } |
| if (to == length) { |
| // None of the members were removed |
| return foundElement; |
| } else if (to == 1) { |
| // All but one member was removed |
| return conflictingMembers[0]; |
| } else if (to == 0) { |
| // All members were removed |
| AnalysisEngine.instance.logger.logInformation( |
| "Multiply defined SDK element: $foundElement"); |
| return foundElement; |
| } |
| List<Element> remaining = new List<Element>(to); |
| JavaSystem.arraycopy(conflictingMembers, 0, remaining, 0, to); |
| return new MultiplyDefinedElementImpl(_definingLibrary.context, remaining); |
| } |
| } |
| |
| /** |
| * Instances of the class `LibraryResolver` are used to resolve one or more mutually dependent |
| * libraries within a single context. |
| */ |
| class LibraryResolver { |
| /** |
| * The analysis context in which the libraries are being analyzed. |
| */ |
| final InternalAnalysisContext analysisContext; |
| |
| /** |
| * The listener to which analysis errors will be reported, this error listener is either |
| * references [recordingErrorListener], or it unions the passed |
| * [AnalysisErrorListener] with the [recordingErrorListener]. |
| */ |
| RecordingErrorListener _errorListener; |
| |
| /** |
| * A source object representing the core library (dart:core). |
| */ |
| Source _coreLibrarySource; |
| |
| /** |
| * The object representing the core library. |
| */ |
| Library _coreLibrary; |
| |
| /** |
| * The object used to access the types from the core library. |
| */ |
| TypeProvider _typeProvider; |
| |
| /** |
| * A table mapping library sources to the information being maintained for those libraries. |
| */ |
| HashMap<Source, Library> _libraryMap = new HashMap<Source, Library>(); |
| |
| /** |
| * A collection containing the libraries that are being resolved together. |
| */ |
| Set<Library> _librariesInCycles; |
| |
| /** |
| * Initialize a newly created library resolver to resolve libraries within the given context. |
| * |
| * @param analysisContext the analysis context in which the library is being analyzed |
| */ |
| LibraryResolver(this.analysisContext) { |
| this._errorListener = new RecordingErrorListener(); |
| _coreLibrarySource = |
| analysisContext.sourceFactory.forUri(DartSdk.DART_CORE); |
| } |
| |
| /** |
| * Return the listener to which analysis errors will be reported. |
| * |
| * @return the listener to which analysis errors will be reported |
| */ |
| RecordingErrorListener get errorListener => _errorListener; |
| |
| /** |
| * Return an array containing information about all of the libraries that were resolved. |
| * |
| * @return an array containing the libraries that were resolved |
| */ |
| Set<Library> get resolvedLibraries => _librariesInCycles; |
| |
| /** |
| * Create an object to represent the information about the library defined by the compilation unit |
| * with the given source. |
| * |
| * @param librarySource the source of the library's defining compilation unit |
| * @return the library object that was created |
| * @throws AnalysisException if the library source is not valid |
| */ |
| Library createLibrary(Source librarySource) { |
| Library library = |
| new Library(analysisContext, _errorListener, librarySource); |
| _libraryMap[librarySource] = library; |
| return library; |
| } |
| |
| /** |
| * Resolve the library specified by the given source in the given context. The library is assumed |
| * to be embedded in the given source. |
| * |
| * @param librarySource the source specifying the defining compilation unit of the library to be |
| * resolved |
| * @param unit the compilation unit representing the embedded library |
| * @param fullAnalysis `true` if a full analysis should be performed |
| * @return the element representing the resolved library |
| * @throws AnalysisException if the library could not be resolved for some reason |
| */ |
| LibraryElement resolveEmbeddedLibrary(Source librarySource, |
| CompilationUnit unit, bool fullAnalysis) { |
| // |
| // Create the objects representing the library being resolved and the core |
| // library. |
| // |
| Library targetLibrary = _createLibraryWithUnit(librarySource, unit); |
| _coreLibrary = _libraryMap[_coreLibrarySource]; |
| if (_coreLibrary == null) { |
| // This will be true unless the library being analyzed is the core |
| // library. |
| _coreLibrary = createLibrary(_coreLibrarySource); |
| if (_coreLibrary == null) { |
| LibraryResolver2.missingCoreLibrary( |
| analysisContext, |
| _coreLibrarySource); |
| } |
| } |
| // |
| // Compute the set of libraries that need to be resolved together. |
| // |
| _computeEmbeddedLibraryDependencies(targetLibrary, unit); |
| _librariesInCycles = _computeLibrariesInCycles(targetLibrary); |
| // |
| // Build the element models representing the libraries being resolved. |
| // This is done in three steps: |
| // |
| // 1. Build the basic element models without making any connections |
| // between elements other than the basic parent/child relationships. |
| // This includes building the elements representing the libraries. |
| // 2. Build the elements for the import and export directives. This |
| // requires that we have the elements built for the referenced |
| // libraries, but because of the possibility of circular references |
| // needs to happen after all of the library elements have been created. |
| // 3. Build the rest of the type model by connecting superclasses, mixins, |
| // and interfaces. This requires that we be able to compute the names |
| // visible in the libraries being resolved, which in turn requires that |
| // we have resolved the import directives. |
| // |
| _buildElementModels(); |
| LibraryElement coreElement = _coreLibrary.libraryElement; |
| if (coreElement == null) { |
| throw new AnalysisException("Could not resolve dart:core"); |
| } |
| _buildDirectiveModels(); |
| _typeProvider = new TypeProviderImpl(coreElement); |
| _buildTypeAliases(); |
| _buildTypeHierarchies(); |
| // |
| // Perform resolution and type analysis. |
| // |
| // TODO(brianwilkerson) Decide whether we want to resolve all of the |
| // libraries or whether we want to only resolve the target library. |
| // The advantage to resolving everything is that we have already done part |
| // of the work so we'll avoid duplicated effort. The disadvantage of |
| // resolving everything is that we might do extra work that we don't |
| // really care about. Another possibility is to add a parameter to this |
| // method and punt the decision to the clients. |
| // |
| //if (analyzeAll) { |
| _resolveReferencesAndTypes(); |
| //} else { |
| // resolveReferencesAndTypes(targetLibrary); |
| //} |
| _performConstantEvaluation(); |
| return targetLibrary.libraryElement; |
| } |
| |
| /** |
| * Resolve the library specified by the given source in the given context. |
| * |
| * Note that because Dart allows circular imports between libraries, it is possible that more than |
| * one library will need to be resolved. In such cases the error listener can receive errors from |
| * multiple libraries. |
| * |
| * @param librarySource the source specifying the defining compilation unit of the library to be |
| * resolved |
| * @param fullAnalysis `true` if a full analysis should be performed |
| * @return the element representing the resolved library |
| * @throws AnalysisException if the library could not be resolved for some reason |
| */ |
| LibraryElement resolveLibrary(Source librarySource, bool fullAnalysis) { |
| // |
| // Create the objects representing the library being resolved and the core |
| // library. |
| // |
| Library targetLibrary = createLibrary(librarySource); |
| _coreLibrary = _libraryMap[_coreLibrarySource]; |
| if (_coreLibrary == null) { |
| // This will be true unless the library being analyzed is the core |
| // library. |
| _coreLibrary = _createLibraryOrNull(_coreLibrarySource); |
| if (_coreLibrary == null) { |
| LibraryResolver2.missingCoreLibrary( |
| analysisContext, |
| _coreLibrarySource); |
| } |
| } |
| // |
| // Compute the set of libraries that need to be resolved together. |
| // |
| _computeLibraryDependencies(targetLibrary); |
| _librariesInCycles = _computeLibrariesInCycles(targetLibrary); |
| // |
| // Build the element models representing the libraries being resolved. |
| // This is done in three steps: |
| // |
| // 1. Build the basic element models without making any connections |
| // between elements other than the basic parent/child relationships. |
| // This includes building the elements representing the libraries, but |
| // excludes members defined in enums. |
| // 2. Build the elements for the import and export directives. This |
| // requires that we have the elements built for the referenced |
| // libraries, but because of the possibility of circular references |
| // needs to happen after all of the library elements have been created. |
| // 3. Build the members in enum declarations. |
| // 4. Build the rest of the type model by connecting superclasses, mixins, |
| // and interfaces. This requires that we be able to compute the names |
| // visible in the libraries being resolved, which in turn requires that |
| // we have resolved the import directives. |
| // |
| _buildElementModels(); |
| LibraryElement coreElement = _coreLibrary.libraryElement; |
| if (coreElement == null) { |
| throw new AnalysisException("Could not resolve dart:core"); |
| } |
| _buildDirectiveModels(); |
| _typeProvider = new TypeProviderImpl(coreElement); |
| _buildEnumMembers(); |
| _buildTypeAliases(); |
| _buildTypeHierarchies(); |
| _buildImplicitConstructors(); |
| // |
| // Perform resolution and type analysis. |
| // |
| // TODO(brianwilkerson) Decide whether we want to resolve all of the |
| // libraries or whether we want to only resolve the target library. The |
| // advantage to resolving everything is that we have already done part of |
| // the work so we'll avoid duplicated effort. The disadvantage of |
| // resolving everything is that we might do extra work that we don't |
| // really care about. Another possibility is to add a parameter to this |
| // method and punt the decision to the clients. |
| // |
| //if (analyzeAll) { |
| _resolveReferencesAndTypes(); |
| //} else { |
| // resolveReferencesAndTypes(targetLibrary); |
| //} |
| _performConstantEvaluation(); |
| return targetLibrary.libraryElement; |
| } |
| |
| /** |
| * Add a dependency to the given map from the referencing library to the referenced library. |
| * |
| * @param dependencyMap the map to which the dependency is to be added |
| * @param referencingLibrary the library that references the referenced library |
| * @param referencedLibrary the library referenced by the referencing library |
| */ |
| void _addDependencyToMap(HashMap<Library, List<Library>> dependencyMap, |
| Library referencingLibrary, Library referencedLibrary) { |
| List<Library> dependentLibraries = dependencyMap[referencedLibrary]; |
| if (dependentLibraries == null) { |
| dependentLibraries = new List<Library>(); |
| dependencyMap[referencedLibrary] = dependentLibraries; |
| } |
| dependentLibraries.add(referencingLibrary); |
| } |
| |
| /** |
| * Given a library that is part of a cycle that includes the root library, add to the given set of |
| * libraries all of the libraries reachable from the root library that are also included in the |
| * cycle. |
| * |
| * @param library the library to be added to the collection of libraries in cycles |
| * @param librariesInCycle a collection of the libraries that are in the cycle |
| * @param dependencyMap a table mapping libraries to the collection of libraries from which those |
| * libraries are referenced |
| */ |
| void _addLibrariesInCycle(Library library, Set<Library> librariesInCycle, |
| HashMap<Library, List<Library>> dependencyMap) { |
| if (librariesInCycle.add(library)) { |
| List<Library> dependentLibraries = dependencyMap[library]; |
| if (dependentLibraries != null) { |
| for (Library dependentLibrary in dependentLibraries) { |
| _addLibrariesInCycle( |
| dependentLibrary, |
| librariesInCycle, |
| dependencyMap); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Add the given library, and all libraries reachable from it that have not already been visited, |
| * to the given dependency map. |
| * |
| * @param library the library currently being added to the dependency map |
| * @param dependencyMap the dependency map being computed |
| * @param visitedLibraries the libraries that have already been visited, used to prevent infinite |
| * recursion |
| */ |
| void _addToDependencyMap(Library library, HashMap<Library, |
| List<Library>> dependencyMap, Set<Library> visitedLibraries) { |
| if (visitedLibraries.add(library)) { |
| for (Library referencedLibrary in library.importsAndExports) { |
| _addDependencyToMap(dependencyMap, library, referencedLibrary); |
| _addToDependencyMap(referencedLibrary, dependencyMap, visitedLibraries); |
| } |
| if (!library.explicitlyImportsCore && !identical(library, _coreLibrary)) { |
| _addDependencyToMap(dependencyMap, library, _coreLibrary); |
| } |
| } |
| } |
| |
| /** |
| * Build the element model representing the combinators declared by the given directive. |
| * |
| * @param directive the directive that declares the combinators |
| * @return an array containing the import combinators that were built |
| */ |
| List<NamespaceCombinator> _buildCombinators(NamespaceDirective directive) { |
| List<NamespaceCombinator> combinators = new List<NamespaceCombinator>(); |
| for (Combinator combinator in directive.combinators) { |
| if (combinator is HideCombinator) { |
| HideElementCombinatorImpl hide = new HideElementCombinatorImpl(); |
| hide.hiddenNames = _getIdentifiers(combinator.hiddenNames); |
| combinators.add(hide); |
| } else { |
| ShowElementCombinatorImpl show = new ShowElementCombinatorImpl(); |
| show.offset = combinator.offset; |
| show.end = combinator.end; |
| show.shownNames = |
| _getIdentifiers((combinator as ShowCombinator).shownNames); |
| combinators.add(show); |
| } |
| } |
| return combinators; |
| } |
| |
| /** |
| * Every library now has a corresponding [LibraryElement], so it is now possible to resolve |
| * the import and export directives. |
| * |
| * @throws AnalysisException if the defining compilation unit for any of the libraries could not |
| * be accessed |
| */ |
| void _buildDirectiveModels() { |
| for (Library library in _librariesInCycles) { |
| HashMap<String, PrefixElementImpl> nameToPrefixMap = |
| new HashMap<String, PrefixElementImpl>(); |
| List<ImportElement> imports = new List<ImportElement>(); |
| List<ExportElement> exports = new List<ExportElement>(); |
| for (Directive directive in library.definingCompilationUnit.directives) { |
| if (directive is ImportDirective) { |
| ImportDirective importDirective = directive; |
| String uriContent = importDirective.uriContent; |
| if (DartUriResolver.isDartExtUri(uriContent)) { |
| library.libraryElement.hasExtUri = true; |
| } |
| Source importedSource = importDirective.source; |
| if (importedSource != null) { |
| // The imported source will be null if the URI in the import |
| // directive was invalid. |
| Library importedLibrary = _libraryMap[importedSource]; |
| if (importedLibrary != null) { |
| ImportElementImpl importElement = |
| new ImportElementImpl(directive.offset); |
| StringLiteral uriLiteral = importDirective.uri; |
| importElement.uriOffset = uriLiteral.offset; |
| importElement.uriEnd = uriLiteral.end; |
| importElement.uri = uriContent; |
| importElement.deferred = importDirective.deferredToken != null; |
| importElement.combinators = _buildCombinators(importDirective); |
| LibraryElement importedLibraryElement = |
| importedLibrary.libraryElement; |
| if (importedLibraryElement != null) { |
| importElement.importedLibrary = importedLibraryElement; |
| } |
| SimpleIdentifier prefixNode = directive.prefix; |
| if (prefixNode != null) { |
| importElement.prefixOffset = prefixNode.offset; |
| String prefixName = prefixNode.name; |
| PrefixElementImpl prefix = nameToPrefixMap[prefixName]; |
| if (prefix == null) { |
| prefix = new PrefixElementImpl.forNode(prefixNode); |
| nameToPrefixMap[prefixName] = prefix; |
| } |
| importElement.prefix = prefix; |
| prefixNode.staticElement = prefix; |
| } |
| directive.element = importElement; |
| imports.add(importElement); |
| if (analysisContext.computeKindOf(importedSource) != |
| SourceKind.LIBRARY) { |
| ErrorCode errorCode = (importElement.isDeferred ? |
| StaticWarningCode.IMPORT_OF_NON_LIBRARY : |
| CompileTimeErrorCode.IMPORT_OF_NON_LIBRARY); |
| _errorListener.onError( |
| new AnalysisError.con2( |
| library.librarySource, |
| uriLiteral.offset, |
| uriLiteral.length, |
| errorCode, |
| [uriLiteral.toSource()])); |
| } |
| } |
| } |
| } else if (directive is ExportDirective) { |
| ExportDirective exportDirective = directive; |
| Source exportedSource = exportDirective.source; |
| if (exportedSource != null) { |
| // The exported source will be null if the URI in the export |
| // directive was invalid. |
| Library exportedLibrary = _libraryMap[exportedSource]; |
| if (exportedLibrary != null) { |
| ExportElementImpl exportElement = new ExportElementImpl(); |
| StringLiteral uriLiteral = exportDirective.uri; |
| exportElement.uriOffset = uriLiteral.offset; |
| exportElement.uriEnd = uriLiteral.end; |
| exportElement.uri = exportDirective.uriContent; |
| exportElement.combinators = _buildCombinators(exportDirective); |
| LibraryElement exportedLibraryElement = |
| exportedLibrary.libraryElement; |
| if (exportedLibraryElement != null) { |
| exportElement.exportedLibrary = exportedLibraryElement; |
| } |
| directive.element = exportElement; |
| exports.add(exportElement); |
| if (analysisContext.computeKindOf(exportedSource) != |
| SourceKind.LIBRARY) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| library.librarySource, |
| uriLiteral.offset, |
| uriLiteral.length, |
| CompileTimeErrorCode.EXPORT_OF_NON_LIBRARY, |
| [uriLiteral.toSource()])); |
| } |
| } |
| } |
| } |
| } |
| Source librarySource = library.librarySource; |
| if (!library.explicitlyImportsCore && |
| _coreLibrarySource != librarySource) { |
| ImportElementImpl importElement = new ImportElementImpl(-1); |
| importElement.importedLibrary = _coreLibrary.libraryElement; |
| importElement.synthetic = true; |
| imports.add(importElement); |
| } |
| LibraryElementImpl libraryElement = library.libraryElement; |
| libraryElement.imports = imports; |
| libraryElement.exports = exports; |
| if (libraryElement.entryPoint == null) { |
| Namespace namespace = |
| new NamespaceBuilder().createExportNamespaceForLibrary(libraryElement); |
| Element element = namespace.get(LibraryElementBuilder.ENTRY_POINT_NAME); |
| if (element is FunctionElement) { |
| libraryElement.entryPoint = element; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Build element models for all of the libraries in the current cycle. |
| * |
| * @throws AnalysisException if any of the element models cannot be built |
| */ |
| void _buildElementModels() { |
| for (Library library in _librariesInCycles) { |
| LibraryElementBuilder builder = |
| new LibraryElementBuilder(analysisContext, errorListener); |
| LibraryElementImpl libraryElement = builder.buildLibrary(library); |
| library.libraryElement = libraryElement; |
| } |
| } |
| |
| /** |
| * Build the members in enum declarations. This cannot be done while building the rest of the |
| * element model because it depends on being able to access core types, which cannot happen until |
| * the rest of the element model has been built (when resolving the core library). |
| * |
| * @throws AnalysisException if any of the enum members could not be built |
| */ |
| void _buildEnumMembers() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| for (Library library in _librariesInCycles) { |
| for (Source source in library.compilationUnitSources) { |
| EnumMemberBuilder builder = new EnumMemberBuilder(_typeProvider); |
| library.getAST(source).accept(builder); |
| } |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Finish steps that the [buildTypeHierarchies] could not perform, see |
| * [ImplicitConstructorBuilder]. |
| * |
| * @throws AnalysisException if any of the type hierarchies could not be resolved |
| */ |
| void _buildImplicitConstructors() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| ImplicitConstructorComputer computer = |
| new ImplicitConstructorComputer(_typeProvider); |
| for (Library library in _librariesInCycles) { |
| for (Source source in library.compilationUnitSources) { |
| computer.add( |
| library.getAST(source), |
| source, |
| library.libraryElement, |
| library.libraryScope); |
| } |
| } |
| computer.compute(); |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Resolve the types referenced by function type aliases across all of the function type aliases |
| * defined in the current cycle. |
| * |
| * @throws AnalysisException if any of the function type aliases could not be resolved |
| */ |
| void _buildTypeAliases() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| List<LibraryResolver_TypeAliasInfo> typeAliases = |
| new List<LibraryResolver_TypeAliasInfo>(); |
| for (Library library in _librariesInCycles) { |
| for (Source source in library.compilationUnitSources) { |
| CompilationUnit ast = library.getAST(source); |
| for (CompilationUnitMember member in ast.declarations) { |
| if (member is FunctionTypeAlias) { |
| typeAliases.add( |
| new LibraryResolver_TypeAliasInfo(library, source, member)); |
| } |
| } |
| } |
| } |
| // TODO(brianwilkerson) We need to sort the type aliases such that all |
| // aliases referenced by an alias T are resolved before we resolve T. |
| for (LibraryResolver_TypeAliasInfo info in typeAliases) { |
| TypeResolverVisitor visitor = |
| new TypeResolverVisitor.con1(info._library, info._source, _typeProvider); |
| info._typeAlias.accept(visitor); |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Resolve the type hierarchy across all of the types declared in the libraries in the current |
| * cycle. |
| * |
| * @throws AnalysisException if any of the type hierarchies could not be resolved |
| */ |
| void _buildTypeHierarchies() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| for (Library library in _librariesInCycles) { |
| for (Source source in library.compilationUnitSources) { |
| TypeResolverVisitor visitor = |
| new TypeResolverVisitor.con1(library, source, _typeProvider); |
| library.getAST(source).accept(visitor); |
| } |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Compute a dependency map of libraries reachable from the given library. A dependency map is a |
| * table that maps individual libraries to a list of the libraries that either import or export |
| * those libraries. |
| * |
| * This map is used to compute all of the libraries involved in a cycle that include the root |
| * library. Given that we only add libraries that are reachable from the root library, when we |
| * work backward we are guaranteed to only get libraries in the cycle. |
| * |
| * @param library the library currently being added to the dependency map |
| */ |
| HashMap<Library, List<Library>> _computeDependencyMap(Library library) { |
| HashMap<Library, List<Library>> dependencyMap = |
| new HashMap<Library, List<Library>>(); |
| _addToDependencyMap(library, dependencyMap, new HashSet<Library>()); |
| return dependencyMap; |
| } |
| |
| /** |
| * Recursively traverse the libraries reachable from the given library, creating instances of the |
| * class [Library] to represent them, and record the references in the library objects. |
| * |
| * @param library the library to be processed to find libraries that have not yet been traversed |
| * @throws AnalysisException if some portion of the library graph could not be traversed |
| */ |
| void _computeEmbeddedLibraryDependencies(Library library, |
| CompilationUnit unit) { |
| Source librarySource = library.librarySource; |
| HashSet<Source> exportedSources = new HashSet<Source>(); |
| HashSet<Source> importedSources = new HashSet<Source>(); |
| for (Directive directive in unit.directives) { |
| if (directive is ExportDirective) { |
| Source exportSource = _resolveSource(librarySource, directive); |
| if (exportSource != null) { |
| exportedSources.add(exportSource); |
| } |
| } else if (directive is ImportDirective) { |
| Source importSource = _resolveSource(librarySource, directive); |
| if (importSource != null) { |
| importedSources.add(importSource); |
| } |
| } |
| } |
| _computeLibraryDependenciesFromDirectives( |
| library, |
| new List.from(importedSources), |
| new List.from(exportedSources)); |
| } |
| |
| /** |
| * Return a collection containing all of the libraries reachable from the given library that are |
| * contained in a cycle that includes the given library. |
| * |
| * @param library the library that must be included in any cycles whose members are to be returned |
| * @return all of the libraries referenced by the given library that have a circular reference |
| * back to the given library |
| */ |
| Set<Library> _computeLibrariesInCycles(Library library) { |
| HashMap<Library, List<Library>> dependencyMap = |
| _computeDependencyMap(library); |
| Set<Library> librariesInCycle = new HashSet<Library>(); |
| _addLibrariesInCycle(library, librariesInCycle, dependencyMap); |
| return librariesInCycle; |
| } |
| |
| /** |
| * Recursively traverse the libraries reachable from the given library, creating instances of the |
| * class [Library] to represent them, and record the references in the library objects. |
| * |
| * @param library the library to be processed to find libraries that have not yet been traversed |
| * @throws AnalysisException if some portion of the library graph could not be traversed |
| */ |
| void _computeLibraryDependencies(Library library) { |
| Source librarySource = library.librarySource; |
| _computeLibraryDependenciesFromDirectives( |
| library, |
| analysisContext.computeImportedLibraries(librarySource), |
| analysisContext.computeExportedLibraries(librarySource)); |
| } |
| |
| /** |
| * Recursively traverse the libraries reachable from the given library, creating instances of the |
| * class [Library] to represent them, and record the references in the library objects. |
| * |
| * @param library the library to be processed to find libraries that have not yet been traversed |
| * @param importedSources an array containing the sources that are imported into the given library |
| * @param exportedSources an array containing the sources that are exported from the given library |
| * @throws AnalysisException if some portion of the library graph could not be traversed |
| */ |
| void _computeLibraryDependenciesFromDirectives(Library library, |
| List<Source> importedSources, List<Source> exportedSources) { |
| List<Library> importedLibraries = new List<Library>(); |
| bool explicitlyImportsCore = false; |
| for (Source importedSource in importedSources) { |
| if (importedSource == _coreLibrarySource) { |
| explicitlyImportsCore = true; |
| } |
| Library importedLibrary = _libraryMap[importedSource]; |
| if (importedLibrary == null) { |
| importedLibrary = _createLibraryOrNull(importedSource); |
| if (importedLibrary != null) { |
| _computeLibraryDependencies(importedLibrary); |
| } |
| } |
| if (importedLibrary != null) { |
| importedLibraries.add(importedLibrary); |
| } |
| } |
| library.importedLibraries = importedLibraries; |
| List<Library> exportedLibraries = new List<Library>(); |
| for (Source exportedSource in exportedSources) { |
| Library exportedLibrary = _libraryMap[exportedSource]; |
| if (exportedLibrary == null) { |
| exportedLibrary = _createLibraryOrNull(exportedSource); |
| if (exportedLibrary != null) { |
| _computeLibraryDependencies(exportedLibrary); |
| } |
| } |
| if (exportedLibrary != null) { |
| exportedLibraries.add(exportedLibrary); |
| } |
| } |
| library.exportedLibraries = exportedLibraries; |
| library.explicitlyImportsCore = explicitlyImportsCore; |
| if (!explicitlyImportsCore && _coreLibrarySource != library.librarySource) { |
| Library importedLibrary = _libraryMap[_coreLibrarySource]; |
| if (importedLibrary == null) { |
| importedLibrary = _createLibraryOrNull(_coreLibrarySource); |
| if (importedLibrary != null) { |
| _computeLibraryDependencies(importedLibrary); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Create an object to represent the information about the library defined by the compilation unit |
| * with the given source. Return the library object that was created, or `null` if the |
| * source is not valid. |
| * |
| * @param librarySource the source of the library's defining compilation unit |
| * @return the library object that was created |
| */ |
| Library _createLibraryOrNull(Source librarySource) { |
| if (!analysisContext.exists(librarySource)) { |
| return null; |
| } |
| Library library = |
| new Library(analysisContext, _errorListener, librarySource); |
| _libraryMap[librarySource] = library; |
| return library; |
| } |
| |
| /** |
| * Create an object to represent the information about the library defined by the compilation unit |
| * with the given source. |
| * |
| * @param librarySource the source of the library's defining compilation unit |
| * @param unit the compilation unit that defines the library |
| * @return the library object that was created |
| * @throws AnalysisException if the library source is not valid |
| */ |
| Library _createLibraryWithUnit(Source librarySource, CompilationUnit unit) { |
| Library library = |
| new Library(analysisContext, _errorListener, librarySource); |
| library.setDefiningCompilationUnit(unit); |
| _libraryMap[librarySource] = library; |
| return library; |
| } |
| |
| /** |
| * Return an array containing the lexical identifiers associated with the nodes in the given list. |
| * |
| * @param names the AST nodes representing the identifiers |
| * @return the lexical identifiers associated with the nodes in the list |
| */ |
| List<String> _getIdentifiers(NodeList<SimpleIdentifier> names) { |
| int count = names.length; |
| List<String> identifiers = new List<String>(count); |
| for (int i = 0; i < count; i++) { |
| identifiers[i] = names[i].name; |
| } |
| return identifiers; |
| } |
| |
| /** |
| * Compute a value for all of the constants in the libraries being analyzed. |
| */ |
| void _performConstantEvaluation() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| ConstantValueComputer computer = |
| new ConstantValueComputer(_typeProvider, analysisContext.declaredVariables); |
| for (Library library in _librariesInCycles) { |
| for (Source source in library.compilationUnitSources) { |
| try { |
| CompilationUnit unit = library.getAST(source); |
| if (unit != null) { |
| computer.add(unit); |
| } |
| } on AnalysisException catch (exception, stackTrace) { |
| AnalysisEngine.instance.logger.logError( |
| "Internal Error: Could not access AST for ${source.fullName} during constant evaluation", |
| new CaughtException(exception, stackTrace)); |
| } |
| } |
| } |
| computer.computeValues(); |
| // As a temporary workaround for issue 21572, run ConstantVerifier now. |
| // TODO(paulberry): remove this workaround once issue 21572 is fixed. |
| for (Library library in _librariesInCycles) { |
| for (Source source in library.compilationUnitSources) { |
| try { |
| CompilationUnit unit = library.getAST(source); |
| ErrorReporter errorReporter = |
| new ErrorReporter(_errorListener, source); |
| ConstantVerifier constantVerifier = |
| new ConstantVerifier(errorReporter, library.libraryElement, _typeProvider); |
| unit.accept(constantVerifier); |
| } on AnalysisException catch (exception, stackTrace) { |
| AnalysisEngine.instance.logger.logError( |
| "Internal Error: Could not access AST for ${source.fullName} " |
| "during constant verification", |
| new CaughtException(exception, stackTrace)); |
| } |
| } |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Resolve the identifiers and perform type analysis in the libraries in the current cycle. |
| * |
| * @throws AnalysisException if any of the identifiers could not be resolved or if any of the |
| * libraries could not have their types analyzed |
| */ |
| void _resolveReferencesAndTypes() { |
| for (Library library in _librariesInCycles) { |
| _resolveReferencesAndTypesInLibrary(library); |
| } |
| } |
| |
| /** |
| * Resolve the identifiers and perform type analysis in the given library. |
| * |
| * @param library the library to be resolved |
| * @throws AnalysisException if any of the identifiers could not be resolved or if the types in |
| * the library cannot be analyzed |
| */ |
| void _resolveReferencesAndTypesInLibrary(Library library) { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| for (Source source in library.compilationUnitSources) { |
| CompilationUnit ast = library.getAST(source); |
| ast.accept( |
| new VariableResolverVisitor.con1(library, source, _typeProvider)); |
| ResolverVisitor visitor = |
| new ResolverVisitor.con1(library, source, _typeProvider); |
| ast.accept(visitor); |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Return the result of resolving the URI of the given URI-based directive against the URI of the |
| * given library, or `null` if the URI is not valid. |
| * |
| * @param librarySource the source representing the library containing the directive |
| * @param directive the directive which URI should be resolved |
| * @return the result of resolving the URI against the URI of the library |
| */ |
| Source _resolveSource(Source librarySource, UriBasedDirective directive) { |
| StringLiteral uriLiteral = directive.uri; |
| if (uriLiteral is StringInterpolation) { |
| return null; |
| } |
| String uriContent = uriLiteral.stringValue.trim(); |
| if (uriContent == null || uriContent.isEmpty) { |
| return null; |
| } |
| uriContent = Uri.encodeFull(uriContent); |
| return analysisContext.sourceFactory.resolveUri(librarySource, uriContent); |
| } |
| } |
| |
| /** |
| * Instances of the class `LibraryResolver` are used to resolve one or more mutually dependent |
| * libraries within a single context. |
| */ |
| class LibraryResolver2 { |
| /** |
| * The analysis context in which the libraries are being analyzed. |
| */ |
| final InternalAnalysisContext analysisContext; |
| |
| /** |
| * The listener to which analysis errors will be reported, this error listener is either |
| * references [recordingErrorListener], or it unions the passed |
| * [AnalysisErrorListener] with the [recordingErrorListener]. |
| */ |
| RecordingErrorListener _errorListener; |
| |
| /** |
| * A source object representing the core library (dart:core). |
| */ |
| Source _coreLibrarySource; |
| |
| /** |
| * The object representing the core library. |
| */ |
| ResolvableLibrary _coreLibrary; |
| |
| /** |
| * The object used to access the types from the core library. |
| */ |
| TypeProvider _typeProvider; |
| |
| /** |
| * A table mapping library sources to the information being maintained for those libraries. |
| */ |
| HashMap<Source, ResolvableLibrary> _libraryMap = |
| new HashMap<Source, ResolvableLibrary>(); |
| |
| /** |
| * A collection containing the libraries that are being resolved together. |
| */ |
| List<ResolvableLibrary> _librariesInCycle; |
| |
| /** |
| * Initialize a newly created library resolver to resolve libraries within the given context. |
| * |
| * @param analysisContext the analysis context in which the library is being analyzed |
| */ |
| LibraryResolver2(this.analysisContext) { |
| this._errorListener = new RecordingErrorListener(); |
| _coreLibrarySource = |
| analysisContext.sourceFactory.forUri(DartSdk.DART_CORE); |
| } |
| |
| /** |
| * Return the listener to which analysis errors will be reported. |
| * |
| * @return the listener to which analysis errors will be reported |
| */ |
| RecordingErrorListener get errorListener => _errorListener; |
| |
| /** |
| * Return an array containing information about all of the libraries that were resolved. |
| * |
| * @return an array containing the libraries that were resolved |
| */ |
| List<ResolvableLibrary> get resolvedLibraries => _librariesInCycle; |
| |
| /** |
| * Resolve the library specified by the given source in the given context. |
| * |
| * Note that because Dart allows circular imports between libraries, it is possible that more than |
| * one library will need to be resolved. In such cases the error listener can receive errors from |
| * multiple libraries. |
| * |
| * @param librarySource the source specifying the defining compilation unit of the library to be |
| * resolved |
| * @param fullAnalysis `true` if a full analysis should be performed |
| * @return the element representing the resolved library |
| * @throws AnalysisException if the library could not be resolved for some reason |
| */ |
| LibraryElement resolveLibrary(Source librarySource, |
| List<ResolvableLibrary> librariesInCycle) { |
| // |
| // Build the map of libraries that are known. |
| // |
| this._librariesInCycle = librariesInCycle; |
| _libraryMap = _buildLibraryMap(); |
| ResolvableLibrary targetLibrary = _libraryMap[librarySource]; |
| _coreLibrary = _libraryMap[_coreLibrarySource]; |
| // |
| // Build the element models representing the libraries being resolved. |
| // This is done in three steps: |
| // |
| // 1. Build the basic element models without making any connections |
| // between elements other than the basic parent/child relationships. |
| // This includes building the elements representing the libraries, but |
| // excludes members defined in enums. |
| // 2. Build the elements for the import and export directives. This |
| // requires that we have the elements built for the referenced |
| // libraries, but because of the possibility of circular references |
| // needs to happen after all of the library elements have been created. |
| // 3. Build the members in enum declarations. |
| // 4. Build the rest of the type model by connecting superclasses, mixins, |
| // and interfaces. This requires that we be able to compute the names |
| // visible in the libraries being resolved, which in turn requires that |
| // we have resolved the import directives. |
| // |
| _buildElementModels(); |
| LibraryElement coreElement = _coreLibrary.libraryElement; |
| if (coreElement == null) { |
| missingCoreLibrary(analysisContext, _coreLibrarySource); |
| } |
| _buildDirectiveModels(); |
| _typeProvider = new TypeProviderImpl(coreElement); |
| _buildEnumMembers(); |
| _buildTypeAliases(); |
| _buildTypeHierarchies(); |
| _buildImplicitConstructors(); |
| // |
| // Perform resolution and type analysis. |
| // |
| // TODO(brianwilkerson) Decide whether we want to resolve all of the |
| // libraries or whether we want to only resolve the target library. The |
| // advantage to resolving everything is that we have already done part of |
| // the work so we'll avoid duplicated effort. The disadvantage of |
| // resolving everything is that we might do extra work that we don't |
| // really care about. Another possibility is to add a parameter to this |
| // method and punt the decision to the clients. |
| // |
| //if (analyzeAll) { |
| _resolveReferencesAndTypes(); |
| //} else { |
| // resolveReferencesAndTypes(targetLibrary); |
| //} |
| _performConstantEvaluation(); |
| return targetLibrary.libraryElement; |
| } |
| |
| /** |
| * Build the element model representing the combinators declared by the given directive. |
| * |
| * @param directive the directive that declares the combinators |
| * @return an array containing the import combinators that were built |
| */ |
| List<NamespaceCombinator> _buildCombinators(NamespaceDirective directive) { |
| List<NamespaceCombinator> combinators = new List<NamespaceCombinator>(); |
| for (Combinator combinator in directive.combinators) { |
| if (combinator is HideCombinator) { |
| HideElementCombinatorImpl hide = new HideElementCombinatorImpl(); |
| hide.hiddenNames = _getIdentifiers(combinator.hiddenNames); |
| combinators.add(hide); |
| } else { |
| ShowElementCombinatorImpl show = new ShowElementCombinatorImpl(); |
| show.offset = combinator.offset; |
| show.end = combinator.end; |
| show.shownNames = |
| _getIdentifiers((combinator as ShowCombinator).shownNames); |
| combinators.add(show); |
| } |
| } |
| return combinators; |
| } |
| |
| /** |
| * Every library now has a corresponding [LibraryElement], so it is now possible to resolve |
| * the import and export directives. |
| * |
| * @throws AnalysisException if the defining compilation unit for any of the libraries could not |
| * be accessed |
| */ |
| void _buildDirectiveModels() { |
| for (ResolvableLibrary library in _librariesInCycle) { |
| HashMap<String, PrefixElementImpl> nameToPrefixMap = |
| new HashMap<String, PrefixElementImpl>(); |
| List<ImportElement> imports = new List<ImportElement>(); |
| List<ExportElement> exports = new List<ExportElement>(); |
| for (Directive directive in library.definingCompilationUnit.directives) { |
| if (directive is ImportDirective) { |
| ImportDirective importDirective = directive; |
| String uriContent = importDirective.uriContent; |
| if (DartUriResolver.isDartExtUri(uriContent)) { |
| library.libraryElement.hasExtUri = true; |
| } |
| Source importedSource = importDirective.source; |
| if (importedSource != null && |
| analysisContext.exists(importedSource)) { |
| // The imported source will be null if the URI in the import |
| // directive was invalid. |
| ResolvableLibrary importedLibrary = _libraryMap[importedSource]; |
| if (importedLibrary != null) { |
| ImportElementImpl importElement = |
| new ImportElementImpl(directive.offset); |
| StringLiteral uriLiteral = importDirective.uri; |
| if (uriLiteral != null) { |
| importElement.uriOffset = uriLiteral.offset; |
| importElement.uriEnd = uriLiteral.end; |
| } |
| importElement.uri = uriContent; |
| importElement.deferred = importDirective.deferredToken != null; |
| importElement.combinators = _buildCombinators(importDirective); |
| LibraryElement importedLibraryElement = |
| importedLibrary.libraryElement; |
| if (importedLibraryElement != null) { |
| importElement.importedLibrary = importedLibraryElement; |
| } |
| SimpleIdentifier prefixNode = directive.prefix; |
| if (prefixNode != null) { |
| importElement.prefixOffset = prefixNode.offset; |
| String prefixName = prefixNode.name; |
| PrefixElementImpl prefix = nameToPrefixMap[prefixName]; |
| if (prefix == null) { |
| prefix = new PrefixElementImpl.forNode(prefixNode); |
| nameToPrefixMap[prefixName] = prefix; |
| } |
| importElement.prefix = prefix; |
| prefixNode.staticElement = prefix; |
| } |
| directive.element = importElement; |
| imports.add(importElement); |
| if (analysisContext.computeKindOf(importedSource) != |
| SourceKind.LIBRARY) { |
| ErrorCode errorCode = (importElement.isDeferred ? |
| StaticWarningCode.IMPORT_OF_NON_LIBRARY : |
| CompileTimeErrorCode.IMPORT_OF_NON_LIBRARY); |
| _errorListener.onError( |
| new AnalysisError.con2( |
| library.librarySource, |
| uriLiteral.offset, |
| uriLiteral.length, |
| errorCode, |
| [uriLiteral.toSource()])); |
| } |
| } |
| } |
| } else if (directive is ExportDirective) { |
| ExportDirective exportDirective = directive; |
| Source exportedSource = exportDirective.source; |
| if (exportedSource != null && |
| analysisContext.exists(exportedSource)) { |
| // The exported source will be null if the URI in the export |
| // directive was invalid. |
| ResolvableLibrary exportedLibrary = _libraryMap[exportedSource]; |
| if (exportedLibrary != null) { |
| ExportElementImpl exportElement = new ExportElementImpl(); |
| StringLiteral uriLiteral = exportDirective.uri; |
| if (uriLiteral != null) { |
| exportElement.uriOffset = uriLiteral.offset; |
| exportElement.uriEnd = uriLiteral.end; |
| } |
| exportElement.uri = exportDirective.uriContent; |
| exportElement.combinators = _buildCombinators(exportDirective); |
| LibraryElement exportedLibraryElement = |
| exportedLibrary.libraryElement; |
| if (exportedLibraryElement != null) { |
| exportElement.exportedLibrary = exportedLibraryElement; |
| } |
| directive.element = exportElement; |
| exports.add(exportElement); |
| if (analysisContext.computeKindOf(exportedSource) != |
| SourceKind.LIBRARY) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| library.librarySource, |
| uriLiteral.offset, |
| uriLiteral.length, |
| CompileTimeErrorCode.EXPORT_OF_NON_LIBRARY, |
| [uriLiteral.toSource()])); |
| } |
| } |
| } |
| } |
| } |
| Source librarySource = library.librarySource; |
| if (!library.explicitlyImportsCore && |
| _coreLibrarySource != librarySource) { |
| ImportElementImpl importElement = new ImportElementImpl(-1); |
| importElement.importedLibrary = _coreLibrary.libraryElement; |
| importElement.synthetic = true; |
| imports.add(importElement); |
| } |
| LibraryElementImpl libraryElement = library.libraryElement; |
| libraryElement.imports = imports; |
| libraryElement.exports = exports; |
| if (libraryElement.entryPoint == null) { |
| Namespace namespace = |
| new NamespaceBuilder().createExportNamespaceForLibrary(libraryElement); |
| Element element = namespace.get(LibraryElementBuilder.ENTRY_POINT_NAME); |
| if (element is FunctionElement) { |
| libraryElement.entryPoint = element; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Build element models for all of the libraries in the current cycle. |
| * |
| * @throws AnalysisException if any of the element models cannot be built |
| */ |
| void _buildElementModels() { |
| for (ResolvableLibrary library in _librariesInCycle) { |
| LibraryElementBuilder builder = |
| new LibraryElementBuilder(analysisContext, errorListener); |
| builder.buildLibrary2(library); |
| } |
| } |
| |
| /** |
| * Build the members in enum declarations. This cannot be done while building the rest of the |
| * element model because it depends on being able to access core types, which cannot happen until |
| * the rest of the element model has been built (when resolving the core library). |
| * |
| * @throws AnalysisException if any of the enum members could not be built |
| */ |
| void _buildEnumMembers() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| for (ResolvableLibrary library in _librariesInCycle) { |
| for (Source source in library.compilationUnitSources) { |
| EnumMemberBuilder builder = new EnumMemberBuilder(_typeProvider); |
| library.getAST(source).accept(builder); |
| } |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Finish steps that the [buildTypeHierarchies] could not perform, see |
| * [ImplicitConstructorBuilder]. |
| * |
| * @throws AnalysisException if any of the type hierarchies could not be resolved |
| */ |
| void _buildImplicitConstructors() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| ImplicitConstructorComputer computer = |
| new ImplicitConstructorComputer(_typeProvider); |
| for (ResolvableLibrary library in _librariesInCycle) { |
| for (ResolvableCompilationUnit unit in |
| library.resolvableCompilationUnits) { |
| Source source = unit.source; |
| CompilationUnit ast = unit.compilationUnit; |
| computer.add( |
| ast, |
| source, |
| library.libraryElement, |
| library.libraryScope); |
| } |
| } |
| computer.compute(); |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| HashMap<Source, ResolvableLibrary> _buildLibraryMap() { |
| HashMap<Source, ResolvableLibrary> libraryMap = |
| new HashMap<Source, ResolvableLibrary>(); |
| int libraryCount = _librariesInCycle.length; |
| for (int i = 0; i < libraryCount; i++) { |
| ResolvableLibrary library = _librariesInCycle[i]; |
| library.errorListener = _errorListener; |
| libraryMap[library.librarySource] = library; |
| List<ResolvableLibrary> dependencies = library.importsAndExports; |
| int dependencyCount = dependencies.length; |
| for (int j = 0; j < dependencyCount; j++) { |
| ResolvableLibrary dependency = dependencies[j]; |
| //dependency.setErrorListener(errorListener); |
| libraryMap[dependency.librarySource] = dependency; |
| } |
| } |
| return libraryMap; |
| } |
| |
| /** |
| * Resolve the types referenced by function type aliases across all of the function type aliases |
| * defined in the current cycle. |
| * |
| * @throws AnalysisException if any of the function type aliases could not be resolved |
| */ |
| void _buildTypeAliases() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| List<LibraryResolver2_TypeAliasInfo> typeAliases = |
| new List<LibraryResolver2_TypeAliasInfo>(); |
| for (ResolvableLibrary library in _librariesInCycle) { |
| for (ResolvableCompilationUnit unit in |
| library.resolvableCompilationUnits) { |
| for (CompilationUnitMember member in |
| unit.compilationUnit.declarations) { |
| if (member is FunctionTypeAlias) { |
| typeAliases.add( |
| new LibraryResolver2_TypeAliasInfo(library, unit.source, member)); |
| } |
| } |
| } |
| } |
| // TODO(brianwilkerson) We need to sort the type aliases such that all |
| // aliases referenced by an alias T are resolved before we resolve T. |
| for (LibraryResolver2_TypeAliasInfo info in typeAliases) { |
| TypeResolverVisitor visitor = |
| new TypeResolverVisitor.con4(info._library, info._source, _typeProvider); |
| info._typeAlias.accept(visitor); |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Resolve the type hierarchy across all of the types declared in the libraries in the current |
| * cycle. |
| * |
| * @throws AnalysisException if any of the type hierarchies could not be resolved |
| */ |
| void _buildTypeHierarchies() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| for (ResolvableLibrary library in _librariesInCycle) { |
| for (ResolvableCompilationUnit unit in |
| library.resolvableCompilationUnits) { |
| Source source = unit.source; |
| CompilationUnit ast = unit.compilationUnit; |
| TypeResolverVisitor visitor = |
| new TypeResolverVisitor.con4(library, source, _typeProvider); |
| ast.accept(visitor); |
| } |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Return an array containing the lexical identifiers associated with the nodes in the given list. |
| * |
| * @param names the AST nodes representing the identifiers |
| * @return the lexical identifiers associated with the nodes in the list |
| */ |
| List<String> _getIdentifiers(NodeList<SimpleIdentifier> names) { |
| int count = names.length; |
| List<String> identifiers = new List<String>(count); |
| for (int i = 0; i < count; i++) { |
| identifiers[i] = names[i].name; |
| } |
| return identifiers; |
| } |
| |
| /** |
| * Compute a value for all of the constants in the libraries being analyzed. |
| */ |
| void _performConstantEvaluation() { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| ConstantValueComputer computer = |
| new ConstantValueComputer(_typeProvider, analysisContext.declaredVariables); |
| for (ResolvableLibrary library in _librariesInCycle) { |
| for (ResolvableCompilationUnit unit in |
| library.resolvableCompilationUnits) { |
| CompilationUnit ast = unit.compilationUnit; |
| if (ast != null) { |
| computer.add(ast); |
| } |
| } |
| } |
| computer.computeValues(); |
| // As a temporary workaround for issue 21572, run ConstantVerifier now. |
| // TODO(paulberry): remove this workaround once issue 21572 is fixed. |
| for (ResolvableLibrary library in _librariesInCycle) { |
| for (ResolvableCompilationUnit unit in |
| library.resolvableCompilationUnits) { |
| CompilationUnit ast = unit.compilationUnit; |
| ErrorReporter errorReporter = |
| new ErrorReporter(_errorListener, unit.source); |
| ConstantVerifier constantVerifier = |
| new ConstantVerifier(errorReporter, library.libraryElement, _typeProvider); |
| ast.accept(constantVerifier); |
| } |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Resolve the identifiers and perform type analysis in the libraries in the current cycle. |
| * |
| * @throws AnalysisException if any of the identifiers could not be resolved or if any of the |
| * libraries could not have their types analyzed |
| */ |
| void _resolveReferencesAndTypes() { |
| for (ResolvableLibrary library in _librariesInCycle) { |
| _resolveReferencesAndTypesInLibrary(library); |
| } |
| } |
| |
| /** |
| * Resolve the identifiers and perform type analysis in the given library. |
| * |
| * @param library the library to be resolved |
| * @throws AnalysisException if any of the identifiers could not be resolved or if the types in |
| * the library cannot be analyzed |
| */ |
| void _resolveReferencesAndTypesInLibrary(ResolvableLibrary library) { |
| TimeCounter_TimeCounterHandle timeCounter = |
| PerformanceStatistics.resolve.start(); |
| try { |
| for (ResolvableCompilationUnit unit in library.resolvableCompilationUnits) |
| { |
| Source source = unit.source; |
| CompilationUnit ast = unit.compilationUnit; |
| ast.accept( |
| new VariableResolverVisitor.con3(library, source, _typeProvider)); |
| ResolverVisitor visitor = |
| new ResolverVisitor.con4(library, source, _typeProvider); |
| ast.accept(visitor); |
| } |
| } finally { |
| timeCounter.stop(); |
| } |
| } |
| |
| /** |
| * Report that the core library could not be resolved in the given analysis context and throw an |
| * exception. |
| * |
| * @param analysisContext the analysis context in which the failure occurred |
| * @param coreLibrarySource the source representing the core library |
| * @throws AnalysisException always |
| */ |
| static void missingCoreLibrary(AnalysisContext analysisContext, |
| Source coreLibrarySource) { |
| throw new AnalysisException("Could not resolve dart:core"); |
| } |
| } |
| |
| /** |
| * Instances of the class `TypeAliasInfo` hold information about a [TypeAlias]. |
| */ |
| class LibraryResolver2_TypeAliasInfo { |
| final ResolvableLibrary _library; |
| |
| final Source _source; |
| |
| final FunctionTypeAlias _typeAlias; |
| |
| /** |
| * Initialize a newly created information holder with the given information. |
| * |
| * @param library the library containing the type alias |
| * @param source the source of the file containing the type alias |
| * @param typeAlias the type alias being remembered |
| */ |
| LibraryResolver2_TypeAliasInfo(this._library, this._source, this._typeAlias); |
| } |
| |
| /** |
| * Instances of the class `TypeAliasInfo` hold information about a [TypeAlias]. |
| */ |
| class LibraryResolver_TypeAliasInfo { |
| final Library _library; |
| |
| final Source _source; |
| |
| final FunctionTypeAlias _typeAlias; |
| |
| /** |
| * Initialize a newly created information holder with the given information. |
| * |
| * @param library the library containing the type alias |
| * @param source the source of the file containing the type alias |
| * @param typeAlias the type alias being remembered |
| */ |
| LibraryResolver_TypeAliasInfo(this._library, this._source, this._typeAlias); |
| } |
| |
| /** |
| * Instances of the class `LibraryScope` implement a scope containing all of the names defined |
| * in a given library. |
| */ |
| class LibraryScope extends EnclosedScope { |
| /** |
| * Initialize a newly created scope representing the names defined in the given library. |
| * |
| * @param definingLibrary the element representing the library represented by this scope |
| * @param errorListener the listener that is to be informed when an error is encountered |
| */ |
| LibraryScope(LibraryElement definingLibrary, |
| AnalysisErrorListener errorListener) |
| : super(new LibraryImportScope(definingLibrary, errorListener)) { |
| _defineTopLevelNames(definingLibrary); |
| } |
| |
| @override |
| AnalysisError getErrorForDuplicate(Element existing, Element duplicate) { |
| if (existing is PrefixElement) { |
| // TODO(scheglov) consider providing actual 'nameOffset' from the |
| // synthetic accessor |
| int offset = duplicate.nameOffset; |
| if (duplicate is PropertyAccessorElement) { |
| PropertyAccessorElement accessor = duplicate; |
| if (accessor.isSynthetic) { |
| offset = accessor.variable.nameOffset; |
| } |
| } |
| return new AnalysisError.con2( |
| duplicate.source, |
| offset, |
| duplicate.displayName.length, |
| CompileTimeErrorCode.PREFIX_COLLIDES_WITH_TOP_LEVEL_MEMBER, |
| [existing.displayName]); |
| } |
| return super.getErrorForDuplicate(existing, duplicate); |
| } |
| |
| /** |
| * Add to this scope all of the public top-level names that are defined in the given compilation |
| * unit. |
| * |
| * @param compilationUnit the compilation unit defining the top-level names to be added to this |
| * scope |
| */ |
| void _defineLocalNames(CompilationUnitElement compilationUnit) { |
| for (PropertyAccessorElement element in compilationUnit.accessors) { |
| define(element); |
| } |
| for (ClassElement element in compilationUnit.enums) { |
| define(element); |
| } |
| for (FunctionElement element in compilationUnit.functions) { |
| define(element); |
| } |
| for (FunctionTypeAliasElement element in |
| compilationUnit.functionTypeAliases) { |
| define(element); |
| } |
| for (ClassElement element in compilationUnit.types) { |
| define(element); |
| } |
| } |
| |
| /** |
| * Add to this scope all of the names that are explicitly defined in the given library. |
| * |
| * @param definingLibrary the element representing the library that defines the names in this |
| * scope |
| */ |
| void _defineTopLevelNames(LibraryElement definingLibrary) { |
| for (PrefixElement prefix in definingLibrary.prefixes) { |
| define(prefix); |
| } |
| _defineLocalNames(definingLibrary.definingCompilationUnit); |
| for (CompilationUnitElement compilationUnit in definingLibrary.parts) { |
| _defineLocalNames(compilationUnit); |
| } |
| } |
| } |
| |
| /** |
| * This class is used to replace uses of `HashMap<String, ExecutableElement>` which are not as |
| * performant as this class. |
| */ |
| class MemberMap { |
| /** |
| * The current size of this map. |
| */ |
| int _size = 0; |
| |
| /** |
| * The array of keys. |
| */ |
| List<String> _keys; |
| |
| /** |
| * The array of ExecutableElement values. |
| */ |
| List<ExecutableElement> _values; |
| |
| /** |
| * Default constructor. |
| */ |
| MemberMap() : this.con1(10); |
| |
| /** |
| * This constructor takes an initial capacity of the map. |
| * |
| * @param initialCapacity the initial capacity |
| */ |
| MemberMap.con1(int initialCapacity) { |
| _initArrays(initialCapacity); |
| } |
| |
| /** |
| * Copy constructor. |
| */ |
| MemberMap.con2(MemberMap memberMap) { |
| _initArrays(memberMap._size + 5); |
| for (int i = 0; i < memberMap._size; i++) { |
| _keys[i] = memberMap._keys[i]; |
| _values[i] = memberMap._values[i]; |
| } |
| _size = memberMap._size; |
| } |
| |
| /** |
| * The size of the map. |
| * |
| * @return the size of the map. |
| */ |
| int get size => _size; |
| |
| /** |
| * Given some key, return the ExecutableElement value from the map, if the key does not exist in |
| * the map, `null` is returned. |
| * |
| * @param key some key to look up in the map |
| * @return the associated ExecutableElement value from the map, if the key does not exist in the |
| * map, `null` is returned |
| */ |
| ExecutableElement get(String key) { |
| for (int i = 0; i < _size; i++) { |
| if (_keys[i] != null && _keys[i] == key) { |
| return _values[i]; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Get and return the key at the specified location. If the key/value pair has been removed from |
| * the set, then `null` is returned. |
| * |
| * @param i some non-zero value less than size |
| * @return the key at the passed index |
| * @throw ArrayIndexOutOfBoundsException this exception is thrown if the passed index is less than |
| * zero or greater than or equal to the capacity of the arrays |
| */ |
| String getKey(int i) => _keys[i]; |
| |
| /** |
| * Get and return the ExecutableElement at the specified location. If the key/value pair has been |
| * removed from the set, then then `null` is returned. |
| * |
| * @param i some non-zero value less than size |
| * @return the key at the passed index |
| * @throw ArrayIndexOutOfBoundsException this exception is thrown if the passed index is less than |
| * zero or greater than or equal to the capacity of the arrays |
| */ |
| ExecutableElement getValue(int i) => _values[i]; |
| |
| /** |
| * Given some key/value pair, store the pair in the map. If the key exists already, then the new |
| * value overrides the old value. |
| * |
| * @param key the key to store in the map |
| * @param value the ExecutableElement value to store in the map |
| */ |
| void put(String key, ExecutableElement value) { |
| // If we already have a value with this key, override the value |
| for (int i = 0; i < _size; i++) { |
| if (_keys[i] != null && _keys[i] == key) { |
| _values[i] = value; |
| return; |
| } |
| } |
| // If needed, double the size of our arrays and copy values over in both |
| // arrays |
| if (_size == _keys.length) { |
| int newArrayLength = _size * 2; |
| List<String> keys_new_array = new List<String>(newArrayLength); |
| List<ExecutableElement> values_new_array = |
| new List<ExecutableElement>(newArrayLength); |
| for (int i = 0; i < _size; i++) { |
| keys_new_array[i] = _keys[i]; |
| } |
| for (int i = 0; i < _size; i++) { |
| values_new_array[i] = _values[i]; |
| } |
| _keys = keys_new_array; |
| _values = values_new_array; |
| } |
| // Put new value at end of array |
| _keys[_size] = key; |
| _values[_size] = value; |
| _size++; |
| } |
| |
| /** |
| * Given some [String] key, this method replaces the associated key and value pair with |
| * `null`. The size is not decremented with this call, instead it is expected that the users |
| * check for `null`. |
| * |
| * @param key the key of the key/value pair to remove from the map |
| */ |
| void remove(String key) { |
| for (int i = 0; i < _size; i++) { |
| if (_keys[i] == key) { |
| _keys[i] = null; |
| _values[i] = null; |
| return; |
| } |
| } |
| } |
| |
| /** |
| * Sets the ExecutableElement at the specified location. |
| * |
| * @param i some non-zero value less than size |
| * @param value the ExecutableElement value to store in the map |
| */ |
| void setValue(int i, ExecutableElement value) { |
| _values[i] = value; |
| } |
| |
| /** |
| * Initializes [keys] and [values]. |
| */ |
| void _initArrays(int initialCapacity) { |
| _keys = new List<String>(initialCapacity); |
| _values = new List<ExecutableElement>(initialCapacity); |
| } |
| } |
| |
| /** |
| * Instances of the class `Namespace` implement a mapping of identifiers to the elements |
| * represented by those identifiers. Namespaces are the building blocks for scopes. |
| */ |
| class Namespace { |
| /** |
| * An empty namespace. |
| */ |
| static Namespace EMPTY = new Namespace(new HashMap<String, Element>()); |
| |
| /** |
| * A table mapping names that are defined in this namespace to the element representing the thing |
| * declared with that name. |
| */ |
| final HashMap<String, Element> _definedNames; |
| |
| /** |
| * Initialize a newly created namespace to have the given defined names. |
| * |
| * @param definedNames the mapping from names that are defined in this namespace to the |
| * corresponding elements |
| */ |
| Namespace(this._definedNames); |
| |
| /** |
| * Return a table containing the same mappings as those defined by this namespace. |
| * |
| * @return a table containing the same mappings as those defined by this namespace |
| */ |
| Map<String, Element> get definedNames => |
| new HashMap<String, Element>.from(_definedNames); |
| |
| /** |
| * Return the element in this namespace that is available to the containing scope using the given |
| * name. |
| * |
| * @param name the name used to reference the |
| * @return the element represented by the given identifier |
| */ |
| Element get(String name) => _definedNames[name]; |
| } |
| |
| /** |
| * Instances of the class `NamespaceBuilder` are used to build a `Namespace`. Namespace |
| * builders are thread-safe and re-usable. |
| */ |
| class NamespaceBuilder { |
| /** |
| * Create a namespace representing the export namespace of the given [ExportElement]. |
| * |
| * @param element the export element whose export namespace is to be created |
| * @return the export namespace that was created |
| */ |
| Namespace createExportNamespaceForDirective(ExportElement element) { |
| LibraryElement exportedLibrary = element.exportedLibrary; |
| if (exportedLibrary == null) { |
| // |
| // The exported library will be null if the URI does not reference a valid |
| // library. |
| // |
| return Namespace.EMPTY; |
| } |
| HashMap<String, Element> definedNames = |
| _createExportMapping(exportedLibrary, new HashSet<LibraryElement>()); |
| definedNames = _applyCombinators(definedNames, element.combinators); |
| return new Namespace(definedNames); |
| } |
| |
| /** |
| * Create a namespace representing the export namespace of the given library. |
| * |
| * @param library the library whose export namespace is to be created |
| * @return the export namespace that was created |
| */ |
| Namespace createExportNamespaceForLibrary(LibraryElement library) => |
| new Namespace(_createExportMapping(library, new HashSet<LibraryElement>())); |
| |
| /** |
| * Create a namespace representing the import namespace of the given library. |
| * |
| * @param library the library whose import namespace is to be created |
| * @return the import namespace that was created |
| */ |
| Namespace createImportNamespaceForDirective(ImportElement element) { |
| LibraryElement importedLibrary = element.importedLibrary; |
| if (importedLibrary == null) { |
| // |
| // The imported library will be null if the URI does not reference a valid |
| // library. |
| // |
| return Namespace.EMPTY; |
| } |
| HashMap<String, Element> definedNames = |
| _createExportMapping(importedLibrary, new HashSet<LibraryElement>()); |
| definedNames = _applyCombinators(definedNames, element.combinators); |
| definedNames = _applyPrefix(definedNames, element.prefix); |
| return new Namespace(definedNames); |
| } |
| |
| /** |
| * Create a namespace representing the public namespace of the given library. |
| * |
| * @param library the library whose public namespace is to be created |
| * @return the public namespace that was created |
| */ |
| Namespace createPublicNamespaceForLibrary(LibraryElement library) { |
| HashMap<String, Element> definedNames = new HashMap<String, Element>(); |
| _addPublicNames(definedNames, library.definingCompilationUnit); |
| for (CompilationUnitElement compilationUnit in library.parts) { |
| _addPublicNames(definedNames, compilationUnit); |
| } |
| return new Namespace(definedNames); |
| } |
| |
| /** |
| * Add all of the names in the given namespace to the given mapping table. |
| * |
| * @param definedNames the mapping table to which the names in the given namespace are to be added |
| * @param namespace the namespace containing the names to be added to this namespace |
| */ |
| void _addAllFromMap(Map<String, Element> definedNames, Map<String, |
| Element> newNames) { |
| newNames.forEach((String name, Element element) { |
| definedNames[name] = element; |
| }); |
| } |
| |
| /** |
| * Add all of the names in the given namespace to the given mapping table. |
| * |
| * @param definedNames the mapping table to which the names in the given namespace are to be added |
| * @param namespace the namespace containing the names to be added to this namespace |
| */ |
| void _addAllFromNamespace(Map<String, Element> definedNames, |
| Namespace namespace) { |
| if (namespace != null) { |
| _addAllFromMap(definedNames, namespace.definedNames); |
| } |
| } |
| |
| /** |
| * Add the given element to the given mapping table if it has a publicly visible name. |
| * |
| * @param definedNames the mapping table to which the public name is to be added |
| * @param element the element to be added |
| */ |
| void _addIfPublic(Map<String, Element> definedNames, Element element) { |
| String name = element.name; |
| if (name != null && !Scope.isPrivateName(name)) { |
| definedNames[name] = element; |
| } |
| } |
| |
| /** |
| * Add to the given mapping table all of the public top-level names that are defined in the given |
| * compilation unit. |
| * |
| * @param definedNames the mapping table to which the public names are to be added |
| * @param compilationUnit the compilation unit defining the top-level names to be added to this |
| * namespace |
| */ |
| void _addPublicNames(Map<String, Element> definedNames, |
| CompilationUnitElement compilationUnit) { |
| for (PropertyAccessorElement element in compilationUnit.accessors) { |
| _addIfPublic(definedNames, element); |
| } |
| for (ClassElement element in compilationUnit.enums) { |
| _addIfPublic(definedNames, element); |
| } |
| for (FunctionElement element in compilationUnit.functions) { |
| _addIfPublic(definedNames, element); |
| } |
| for (FunctionTypeAliasElement element in |
| compilationUnit.functionTypeAliases) { |
| _addIfPublic(definedNames, element); |
| } |
| for (ClassElement element in compilationUnit.types) { |
| _addIfPublic(definedNames, element); |
| } |
| } |
| |
| /** |
| * Apply the given combinators to all of the names in the given mapping table. |
| * |
| * @param definedNames the mapping table to which the namespace operations are to be applied |
| * @param combinators the combinators to be applied |
| */ |
| HashMap<String, Element> _applyCombinators(HashMap<String, |
| Element> definedNames, List<NamespaceCombinator> combinators) { |
| for (NamespaceCombinator combinator in combinators) { |
| if (combinator is HideElementCombinator) { |
| _hide(definedNames, combinator.hiddenNames); |
| } else if (combinator is ShowElementCombinator) { |
| definedNames = _show(definedNames, combinator.shownNames); |
| } else { |
| // Internal error. |
| AnalysisEngine.instance.logger.logError( |
| "Unknown type of combinator: ${combinator.runtimeType}"); |
| } |
| } |
| return definedNames; |
| } |
| |
| /** |
| * Apply the given prefix to all of the names in the table of defined names. |
| * |
| * @param definedNames the names that were defined before this operation |
| * @param prefixElement the element defining the prefix to be added to the names |
| */ |
| HashMap<String, Element> _applyPrefix(HashMap<String, Element> definedNames, |
| PrefixElement prefixElement) { |
| if (prefixElement != null) { |
| String prefix = prefixElement.name; |
| HashMap<String, Element> newNames = new HashMap<String, Element>(); |
| definedNames.forEach((String name, Element element) { |
| newNames["$prefix.$name"] = element; |
| }); |
| return newNames; |
| } else { |
| return definedNames; |
| } |
| } |
| |
| /** |
| * Create a mapping table representing the export namespace of the given library. |
| * |
| * @param library the library whose public namespace is to be created |
| * @param visitedElements a set of libraries that do not need to be visited when processing the |
| * export directives of the given library because all of the names defined by them will |
| * be added by another library |
| * @return the mapping table that was created |
| */ |
| HashMap<String, Element> _createExportMapping(LibraryElement library, |
| HashSet<LibraryElement> visitedElements) { |
| visitedElements.add(library); |
| try { |
| HashMap<String, Element> definedNames = new HashMap<String, Element>(); |
| for (ExportElement element in library.exports) { |
| LibraryElement exportedLibrary = element.exportedLibrary; |
| if (exportedLibrary != null && |
| !visitedElements.contains(exportedLibrary)) { |
| // |
| // The exported library will be null if the URI does not reference a |
| // valid library. |
| // |
| HashMap<String, Element> exportedNames = |
| _createExportMapping(exportedLibrary, visitedElements); |
| exportedNames = _applyCombinators(exportedNames, element.combinators); |
| _addAllFromMap(definedNames, exportedNames); |
| } |
| } |
| _addAllFromNamespace( |
| definedNames, |
| (library.context as InternalAnalysisContext).getPublicNamespace(library)); |
| return definedNames; |
| } finally { |
| visitedElements.remove(library); |
| } |
| } |
| |
| /** |
| * Hide all of the given names by removing them from the given collection of defined names. |
| * |
| * @param definedNames the names that were defined before this operation |
| * @param hiddenNames the names to be hidden |
| */ |
| void _hide(HashMap<String, Element> definedNames, List<String> hiddenNames) { |
| for (String name in hiddenNames) { |
| definedNames.remove(name); |
| definedNames.remove("$name="); |
| } |
| } |
| |
| /** |
| * Show only the given names by removing all other names from the given collection of defined |
| * names. |
| * |
| * @param definedNames the names that were defined before this operation |
| * @param shownNames the names to be shown |
| */ |
| HashMap<String, Element> _show(HashMap<String, Element> definedNames, |
| List<String> shownNames) { |
| HashMap<String, Element> newNames = new HashMap<String, Element>(); |
| for (String name in shownNames) { |
| Element element = definedNames[name]; |
| if (element != null) { |
| newNames[name] = element; |
| } |
| String setterName = "$name="; |
| element = definedNames[setterName]; |
| if (element != null) { |
| newNames[setterName] = element; |
| } |
| } |
| return newNames; |
| } |
| } |
| |
| /** |
| * Instances of the class `OverrideVerifier` visit all of the declarations in a compilation |
| * unit to verify that if they have an override annotation it is being used correctly. |
| */ |
| class OverrideVerifier extends RecursiveAstVisitor<Object> { |
| /** |
| * The inheritance manager used to find overridden methods. |
| */ |
| final InheritanceManager _manager; |
| |
| /** |
| * The error reporter used to report errors. |
| */ |
| final ErrorReporter _errorReporter; |
| |
| /** |
| * Initialize a newly created verifier to look for inappropriate uses of the override annotation. |
| * |
| * @param manager the inheritance manager used to find overridden methods |
| * @param errorReporter the error reporter used to report errors |
| */ |
| OverrideVerifier(this._manager, this._errorReporter); |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| ExecutableElement element = node.element; |
| if (_isOverride(element)) { |
| if (_getOverriddenMember(element) == null) { |
| if (element is MethodElement) { |
| _errorReporter.reportErrorForNode( |
| HintCode.OVERRIDE_ON_NON_OVERRIDING_METHOD, |
| node.name); |
| } else if (element is PropertyAccessorElement) { |
| if (element.isGetter) { |
| _errorReporter.reportErrorForNode( |
| HintCode.OVERRIDE_ON_NON_OVERRIDING_GETTER, |
| node.name); |
| } else { |
| _errorReporter.reportErrorForNode( |
| HintCode.OVERRIDE_ON_NON_OVERRIDING_SETTER, |
| node.name); |
| } |
| } |
| } |
| } |
| return super.visitMethodDeclaration(node); |
| } |
| |
| /** |
| * Return the member that overrides the given member. |
| * |
| * @param member the member that overrides the returned member |
| * @return the member that overrides the given member |
| */ |
| ExecutableElement _getOverriddenMember(ExecutableElement member) { |
| LibraryElement library = member.library; |
| if (library == null) { |
| return null; |
| } |
| ClassElement classElement = |
| member.getAncestor((element) => element is ClassElement); |
| if (classElement == null) { |
| return null; |
| } |
| return _manager.lookupInheritance(classElement, member.name); |
| } |
| |
| /** |
| * Return `true` if the given element has an override annotation associated with it. |
| * |
| * @param element the element being tested |
| * @return `true` if the element has an override annotation associated with it |
| */ |
| bool _isOverride(Element element) => element != null && element.isOverride; |
| } |
| |
| /** |
| * Instances of the class `PubVerifier` traverse an AST structure looking for deviations from |
| * pub best practices. |
| */ |
| class PubVerifier extends RecursiveAstVisitor<Object> { |
| // static String _PUBSPEC_YAML = "pubspec.yaml"; |
| |
| /** |
| * The analysis context containing the sources to be analyzed |
| */ |
| final AnalysisContext _context; |
| |
| /** |
| * The error reporter by which errors will be reported. |
| */ |
| final ErrorReporter _errorReporter; |
| |
| PubVerifier(this._context, this._errorReporter); |
| |
| @override |
| Object visitImportDirective(ImportDirective directive) { |
| return null; |
| } |
| |
| // /** |
| // * This verifies that the passed file import directive is not contained in a source inside a |
| // * package "lib" directory hierarchy referencing a source outside that package "lib" directory |
| // * hierarchy. |
| // * |
| // * @param uriLiteral the import URL (not `null`) |
| // * @param path the file path being verified (not `null`) |
| // * @return `true` if and only if an error code is generated on the passed node |
| // * See [PubSuggestionCode.FILE_IMPORT_INSIDE_LIB_REFERENCES_FILE_OUTSIDE]. |
| // */ |
| // bool |
| // _checkForFileImportInsideLibReferencesFileOutside(StringLiteral uriLiteral, |
| // String path) { |
| // Source source = _getSource(uriLiteral); |
| // String fullName = _getSourceFullName(source); |
| // if (fullName != null) { |
| // int pathIndex = 0; |
| // int fullNameIndex = fullName.length; |
| // while (pathIndex < path.length && |
| // StringUtilities.startsWith3(path, pathIndex, 0x2E, 0x2E, 0x2F)) { |
| // fullNameIndex = JavaString.lastIndexOf(fullName, '/', fullNameIndex); |
| // if (fullNameIndex < 4) { |
| // return false; |
| // } |
| // // Check for "/lib" at a specified place in the fullName |
| // if (StringUtilities.startsWith4( |
| // fullName, |
| // fullNameIndex - 4, |
| // 0x2F, |
| // 0x6C, |
| // 0x69, |
| // 0x62)) { |
| // String relativePubspecPath = |
| // path.substring(0, pathIndex + 3) + |
| // _PUBSPEC_YAML; |
| // Source pubspecSource = |
| // _context.sourceFactory.resolveUri(source, relativePubspecPath); |
| // if (_context.exists(pubspecSource)) { |
| // // Files inside the lib directory hierarchy should not reference |
| // // files outside |
| // _errorReporter.reportErrorForNode( |
| // HintCode.FILE_IMPORT_INSIDE_LIB_REFERENCES_FILE_OUTSIDE, |
| // uriLiteral); |
| // } |
| // return true; |
| // } |
| // pathIndex += 3; |
| // } |
| // } |
| // return false; |
| // } |
| |
| // /** |
| // * This verifies that the passed file import directive is not contained in a source outside a |
| // * package "lib" directory hierarchy referencing a source inside that package "lib" directory |
| // * hierarchy. |
| // * |
| // * @param uriLiteral the import URL (not `null`) |
| // * @param path the file path being verified (not `null`) |
| // * @return `true` if and only if an error code is generated on the passed node |
| // * See [PubSuggestionCode.FILE_IMPORT_OUTSIDE_LIB_REFERENCES_FILE_INSIDE]. |
| // */ |
| // bool |
| // _checkForFileImportOutsideLibReferencesFileInside(StringLiteral uriLiteral, |
| // String path) { |
| // if (StringUtilities.startsWith4(path, 0, 0x6C, 0x69, 0x62, 0x2F)) { |
| // if (_checkForFileImportOutsideLibReferencesFileInsideAtIndex( |
| // uriLiteral, |
| // path, |
| // 0)) { |
| // return true; |
| // } |
| // } |
| // int pathIndex = |
| // StringUtilities.indexOf5(path, 0, 0x2F, 0x6C, 0x69, 0x62, 0x2F); |
| // while (pathIndex != -1) { |
| // if (_checkForFileImportOutsideLibReferencesFileInsideAtIndex( |
| // uriLiteral, |
| // path, |
| // pathIndex + 1)) { |
| // return true; |
| // } |
| // pathIndex = |
| // StringUtilities.indexOf5(path, pathIndex + 4, 0x2F, 0x6C, 0x69, 0x62, 0x2F); |
| // } |
| // return false; |
| // } |
| |
| // bool |
| // _checkForFileImportOutsideLibReferencesFileInsideAtIndex(StringLiteral uriLiteral, |
| // String path, int pathIndex) { |
| // Source source = _getSource(uriLiteral); |
| // String relativePubspecPath = path.substring(0, pathIndex) + _PUBSPEC_YAML; |
| // Source pubspecSource = |
| // _context.sourceFactory.resolveUri(source, relativePubspecPath); |
| // if (!_context.exists(pubspecSource)) { |
| // return false; |
| // } |
| // String fullName = _getSourceFullName(source); |
| // if (fullName != null) { |
| // if (StringUtilities.indexOf5(fullName, 0, 0x2F, 0x6C, 0x69, 0x62, 0x2F) < |
| // 0) { |
| // // Files outside the lib directory hierarchy should not reference files |
| // // inside ... use package: url instead |
| // _errorReporter.reportErrorForNode( |
| // HintCode.FILE_IMPORT_OUTSIDE_LIB_REFERENCES_FILE_INSIDE, |
| // uriLiteral); |
| // return true; |
| // } |
| // } |
| // return false; |
| // } |
| |
| // /** |
| // * This verifies that the passed package import directive does not contain ".." |
| // * |
| // * @param uriLiteral the import URL (not `null`) |
| // * @param path the path to be validated (not `null`) |
| // * @return `true` if and only if an error code is generated on the passed node |
| // * See [PubSuggestionCode.PACKAGE_IMPORT_CONTAINS_DOT_DOT]. |
| // */ |
| // bool _checkForPackageImportContainsDotDot(StringLiteral uriLiteral, |
| // String path) { |
| // if (StringUtilities.startsWith3(path, 0, 0x2E, 0x2E, 0x2F) || |
| // StringUtilities.indexOf4(path, 0, 0x2F, 0x2E, 0x2E, 0x2F) >= 0) { |
| // // Package import should not to contain ".." |
| // _errorReporter.reportErrorForNode( |
| // HintCode.PACKAGE_IMPORT_CONTAINS_DOT_DOT, |
| // uriLiteral); |
| // return true; |
| // } |
| // return false; |
| // } |
| |
| // /** |
| // * Answer the source associated with the compilation unit containing the given AST node. |
| // * |
| // * @param node the node (not `null`) |
| // * @return the source or `null` if it could not be determined |
| // */ |
| // Source _getSource(AstNode node) { |
| // Source source = null; |
| // CompilationUnit unit = node.getAncestor((node) => node is CompilationUnit); |
| // if (unit != null) { |
| // CompilationUnitElement element = unit.element; |
| // if (element != null) { |
| // source = element.source; |
| // } |
| // } |
| // return source; |
| // } |
| |
| // /** |
| // * Answer the full name of the given source. The returned value will have all |
| // * [File.separatorChar] replace by '/'. |
| // * |
| // * @param source the source |
| // * @return the full name or `null` if it could not be determined |
| // */ |
| // String _getSourceFullName(Source source) { |
| // if (source != null) { |
| // String fullName = source.fullName; |
| // if (fullName != null) { |
| // return fullName.replaceAll(r'\', '/'); |
| // } |
| // } |
| // return null; |
| // } |
| } |
| |
| /** |
| * Kind of the redirecting constructor. |
| */ |
| class RedirectingConstructorKind extends Enum<RedirectingConstructorKind> { |
| static const RedirectingConstructorKind CONST = |
| const RedirectingConstructorKind('CONST', 0); |
| |
| static const RedirectingConstructorKind NORMAL = |
| const RedirectingConstructorKind('NORMAL', 1); |
| |
| static const List<RedirectingConstructorKind> values = const [CONST, NORMAL]; |
| |
| const RedirectingConstructorKind(String name, int ordinal) |
| : super(name, ordinal); |
| } |
| |
| /** |
| * A `ResolvableLibrary` represents a single library during the resolution of |
| * some (possibly different) library. They are not intended to be used except |
| * during the resolution process. |
| */ |
| class ResolvableLibrary { |
| /** |
| * An empty array that can be used to initialize lists of libraries. |
| */ |
| static List<ResolvableLibrary> _EMPTY_ARRAY = new List<ResolvableLibrary>(0); |
| |
| /** |
| * The source specifying the defining compilation unit of this library. |
| */ |
| final Source librarySource; |
| |
| /** |
| * A list containing all of the libraries that are imported into this library. |
| */ |
| List<ResolvableLibrary> _importedLibraries = _EMPTY_ARRAY; |
| |
| /** |
| * A flag indicating whether this library explicitly imports core. |
| */ |
| bool explicitlyImportsCore = false; |
| |
| /** |
| * An array containing all of the libraries that are exported from this library. |
| */ |
| List<ResolvableLibrary> _exportedLibraries = _EMPTY_ARRAY; |
| |
| /** |
| * An array containing the compilation units that comprise this library. The |
| * defining compilation unit is always first. |
| */ |
| List<ResolvableCompilationUnit> _compilationUnits; |
| |
| /** |
| * The library element representing this library. |
| */ |
| LibraryElementImpl _libraryElement; |
| |
| /** |
| * The listener to which analysis errors will be reported. |
| */ |
| AnalysisErrorListener _errorListener; |
| |
| /** |
| * The inheritance manager which is used for member lookups in this library. |
| */ |
| InheritanceManager _inheritanceManager; |
| |
| /** |
| * The library scope used when resolving elements within this library's compilation units. |
| */ |
| LibraryScope _libraryScope; |
| |
| /** |
| * Initialize a newly created data holder that can maintain the data associated with a library. |
| * |
| * @param librarySource the source specifying the defining compilation unit of this library |
| * @param errorListener the listener to which analysis errors will be reported |
| */ |
| ResolvableLibrary(this.librarySource); |
| |
| /** |
| * Return an array of the [CompilationUnit]s that make up the library. The first unit is |
| * always the defining unit. |
| * |
| * @return an array of the [CompilationUnit]s that make up the library. The first unit is |
| * always the defining unit |
| */ |
| List<CompilationUnit> get compilationUnits { |
| int count = _compilationUnits.length; |
| List<CompilationUnit> units = new List<CompilationUnit>(count); |
| for (int i = 0; i < count; i++) { |
| units[i] = _compilationUnits[i].compilationUnit; |
| } |
| return units; |
| } |
| |
| /** |
| * Return an array containing the sources for the compilation units in this library, including the |
| * defining compilation unit. |
| * |
| * @return the sources for the compilation units in this library |
| */ |
| List<Source> get compilationUnitSources { |
| int count = _compilationUnits.length; |
| List<Source> sources = new List<Source>(count); |
| for (int i = 0; i < count; i++) { |
| sources[i] = _compilationUnits[i].source; |
| } |
| return sources; |
| } |
| |
| /** |
| * Return the AST structure associated with the defining compilation unit for this library. |
| * |
| * @return the AST structure associated with the defining compilation unit for this library |
| * @throws AnalysisException if an AST structure could not be created for the defining compilation |
| * unit |
| */ |
| CompilationUnit get definingCompilationUnit => |
| _compilationUnits[0].compilationUnit; |
| |
| /** |
| * Set the listener to which analysis errors will be reported to be the given listener. |
| * |
| * @param errorListener the listener to which analysis errors will be reported |
| */ |
| void set errorListener(AnalysisErrorListener errorListener) { |
| this._errorListener = errorListener; |
| } |
| |
| /** |
| * Set the libraries that are exported by this library to be those in the given array. |
| * |
| * @param exportedLibraries the libraries that are exported by this library |
| */ |
| void set exportedLibraries(List<ResolvableLibrary> exportedLibraries) { |
| this._exportedLibraries = exportedLibraries; |
| } |
| |
| /** |
| * Return an array containing the libraries that are exported from this library. |
| * |
| * @return an array containing the libraries that are exported from this library |
| */ |
| List<ResolvableLibrary> get exports => _exportedLibraries; |
| |
| /** |
| * Set the libraries that are imported into this library to be those in the given array. |
| * |
| * @param importedLibraries the libraries that are imported into this library |
| */ |
| void set importedLibraries(List<ResolvableLibrary> importedLibraries) { |
| this._importedLibraries = importedLibraries; |
| } |
| |
| /** |
| * Return an array containing the libraries that are imported into this library. |
| * |
| * @return an array containing the libraries that are imported into this library |
| */ |
| List<ResolvableLibrary> get imports => _importedLibraries; |
| |
| /** |
| * Return an array containing the libraries that are either imported or exported from this |
| * library. |
| * |
| * @return the libraries that are either imported or exported from this library |
| */ |
| List<ResolvableLibrary> get importsAndExports { |
| HashSet<ResolvableLibrary> libraries = new HashSet<ResolvableLibrary>(); |
| for (ResolvableLibrary library in _importedLibraries) { |
| libraries.add(library); |
| } |
| for (ResolvableLibrary library in _exportedLibraries) { |
| libraries.add(library); |
| } |
| return new List.from(libraries); |
| } |
| |
| /** |
| * Return the inheritance manager for this library. |
| * |
| * @return the inheritance manager for this library |
| */ |
| InheritanceManager get inheritanceManager { |
| if (_inheritanceManager == null) { |
| return _inheritanceManager = new InheritanceManager(_libraryElement); |
| } |
| return _inheritanceManager; |
| } |
| |
| /** |
| * Return the library element representing this library, creating it if necessary. |
| * |
| * @return the library element representing this library |
| */ |
| LibraryElementImpl get libraryElement => _libraryElement; |
| |
| /** |
| * Set the library element representing this library to the given library element. |
| * |
| * @param libraryElement the library element representing this library |
| */ |
| void set libraryElement(LibraryElementImpl libraryElement) { |
| this._libraryElement = libraryElement; |
| if (_inheritanceManager != null) { |
| _inheritanceManager.libraryElement = libraryElement; |
| } |
| } |
| |
| /** |
| * Return the library scope used when resolving elements within this library's compilation units. |
| * |
| * @return the library scope used when resolving elements within this library's compilation units |
| */ |
| LibraryScope get libraryScope { |
| if (_libraryScope == null) { |
| _libraryScope = new LibraryScope(_libraryElement, _errorListener); |
| } |
| return _libraryScope; |
| } |
| |
| /** |
| * Return an array containing the compilation units that comprise this library. The defining |
| * compilation unit is always first. |
| * |
| * @return the compilation units that comprise this library |
| */ |
| List<ResolvableCompilationUnit> get resolvableCompilationUnits => |
| _compilationUnits; |
| |
| /** |
| * Set the compilation unit in this library to the given compilation units. The defining |
| * compilation unit must be the first element of the array. |
| * |
| * @param units the compilation units in this library |
| */ |
| void set resolvableCompilationUnits(List<ResolvableCompilationUnit> units) { |
| _compilationUnits = units; |
| } |
| |
| /** |
| * Return the AST structure associated with the given source, or `null` if the source does |
| * not represent a compilation unit that is included in this library. |
| * |
| * @param source the source representing the compilation unit whose AST is to be returned |
| * @return the AST structure associated with the given source |
| * @throws AnalysisException if an AST structure could not be created for the compilation unit |
| */ |
| CompilationUnit getAST(Source source) { |
| int count = _compilationUnits.length; |
| for (int i = 0; i < count; i++) { |
| if (_compilationUnits[i].source == source) { |
| return _compilationUnits[i].compilationUnit; |
| } |
| } |
| return null; |
| } |
| |
| @override |
| String toString() => librarySource.shortName; |
| } |
| |
| /** |
| * The enumeration `ResolverErrorCode` defines the error codes used for errors |
| * detected by the resolver. The convention for this class is for the name of |
| * the error code to indicate the problem that caused the error to be generated |
| * and for the error message to explain what is wrong and, when appropriate, how |
| * the problem can be corrected. |
| */ |
| class ResolverErrorCode extends ErrorCode { |
| static const ResolverErrorCode BREAK_LABEL_ON_SWITCH_MEMBER = |
| const ResolverErrorCode( |
| 'BREAK_LABEL_ON_SWITCH_MEMBER', |
| "Break label resolves to case or default statement"); |
| |
| static const ResolverErrorCode CONTINUE_LABEL_ON_SWITCH = |
| const ResolverErrorCode( |
| 'CONTINUE_LABEL_ON_SWITCH', |
| "A continue label resolves to switch, must be loop or switch member"); |
| |
| static const ResolverErrorCode MISSING_LIBRARY_DIRECTIVE_WITH_PART = |
| const ResolverErrorCode( |
| 'MISSING_LIBRARY_DIRECTIVE_WITH_PART', |
| "Libraries that have parts must have a library directive"); |
| |
| /** |
| * Initialize a newly created error code to have the given [name]. The message |
| * associated with the error will be created from the given [message] |
| * template. The correction associated with the error will be created from the |
| * given [correction] template. |
| */ |
| const ResolverErrorCode(String name, String message, [String correction]) |
| : super(name, message, correction); |
| |
| @override |
| ErrorSeverity get errorSeverity => type.severity; |
| |
| @override |
| ErrorType get type => ErrorType.COMPILE_TIME_ERROR; |
| } |
| |
| /** |
| * Instances of the class `ResolverVisitor` are used to resolve the nodes within a single |
| * compilation unit. |
| */ |
| class ResolverVisitor extends ScopedVisitor { |
| /** |
| * The manager for the inheritance mappings. |
| */ |
| InheritanceManager _inheritanceManager; |
| |
| /** |
| * The object used to resolve the element associated with the current node. |
| */ |
| ElementResolver _elementResolver; |
| |
| /** |
| * The object used to compute the type associated with the current node. |
| */ |
| StaticTypeAnalyzer _typeAnalyzer; |
| |
| /** |
| * The class element representing the class containing the current node, |
| * or `null` if the current node is not contained in a class. |
| */ |
| ClassElement enclosingClass = null; |
| |
| /** |
| * The class declaration representing the class containing the current node, or `null` if |
| * the current node is not contained in a class. |
| */ |
| ClassDeclaration _enclosingClassDeclaration = null; |
| |
| /** |
| * The function type alias representing the function type containing the current node, or |
| * `null` if the current node is not contained in a function type alias. |
| */ |
| FunctionTypeAlias _enclosingFunctionTypeAlias = null; |
| |
| /** |
| * The element representing the function containing the current node, or `null` if the |
| * current node is not contained in a function. |
| */ |
| ExecutableElement _enclosingFunction = null; |
| |
| /** |
| * The [Comment] before a [FunctionDeclaration] or a [MethodDeclaration] that |
| * cannot be resolved where we visited it, because it should be resolved in the scope of the body. |
| */ |
| Comment _commentBeforeFunction = null; |
| |
| /** |
| * The object keeping track of which elements have had their types overridden. |
| */ |
| TypeOverrideManager _overrideManager = new TypeOverrideManager(); |
| |
| /** |
| * The object keeping track of which elements have had their types promoted. |
| */ |
| TypePromotionManager _promoteManager = new TypePromotionManager(); |
| |
| /** |
| * A comment before a function should be resolved in the context of the |
| * function. But when we incrementally resolve a comment, we don't want to |
| * resolve the whole function. |
| * |
| * So, this flag is set to `true`, when just context of the function should |
| * be built and the comment resolved. |
| */ |
| bool resolveOnlyCommentInFunctionBody = false; |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| ResolverVisitor.con1(Library library, Source source, |
| TypeProvider typeProvider) |
| : super.con1(library, source, typeProvider) { |
| this._inheritanceManager = library.inheritanceManager; |
| this._elementResolver = new ElementResolver(this); |
| this._typeAnalyzer = new StaticTypeAnalyzer(this); |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param definingLibrary the element for the library containing the compilation unit being |
| * visited |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| * @param errorListener the error listener that will be informed of any errors that are found |
| * during resolution |
| */ |
| ResolverVisitor.con2(LibraryElement definingLibrary, Source source, |
| TypeProvider typeProvider, InheritanceManager inheritanceManager, |
| AnalysisErrorListener errorListener) |
| : super.con2(definingLibrary, source, typeProvider, errorListener) { |
| this._inheritanceManager = inheritanceManager; |
| this._elementResolver = new ElementResolver(this); |
| this._typeAnalyzer = new StaticTypeAnalyzer(this); |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in an AST node. |
| * |
| * @param definingLibrary the element for the library containing the node being visited |
| * @param source the source representing the compilation unit containing the node being visited |
| * @param typeProvider the object used to access the types from the core library |
| * @param nameScope the scope used to resolve identifiers in the node that will first be visited |
| * @param errorListener the error listener that will be informed of any errors that are found |
| * during resolution |
| */ |
| ResolverVisitor.con3(LibraryElement definingLibrary, Source source, |
| TypeProvider typeProvider, Scope nameScope, AnalysisErrorListener errorListener) |
| : super.con3( |
| definingLibrary, |
| source, |
| typeProvider, |
| nameScope, |
| errorListener) { |
| this._inheritanceManager = new InheritanceManager(definingLibrary); |
| this._elementResolver = new ElementResolver(this); |
| this._typeAnalyzer = new StaticTypeAnalyzer(this); |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| ResolverVisitor.con4(ResolvableLibrary library, Source source, |
| TypeProvider typeProvider) |
| : super.con4(library, source, typeProvider) { |
| this._inheritanceManager = library.inheritanceManager; |
| this._elementResolver = new ElementResolver(this); |
| this._typeAnalyzer = new StaticTypeAnalyzer(this); |
| } |
| |
| get elementResolver_J2DAccessor => _elementResolver; |
| |
| set elementResolver_J2DAccessor(__v) => _elementResolver = __v; |
| |
| /** |
| * Return the element representing the function containing the current node, or `null` if |
| * the current node is not contained in a function. |
| * |
| * @return the element representing the function containing the current node |
| */ |
| ExecutableElement get enclosingFunction => _enclosingFunction; |
| |
| get labelScope_J2DAccessor => _labelScope; |
| |
| set labelScope_J2DAccessor(__v) => _labelScope = __v; |
| |
| get nameScope_J2DAccessor => _nameScope; |
| |
| set nameScope_J2DAccessor(__v) => _nameScope = __v; |
| |
| /** |
| * Return the object keeping track of which elements have had their types overridden. |
| * |
| * @return the object keeping track of which elements have had their types overridden |
| */ |
| TypeOverrideManager get overrideManager => _overrideManager; |
| |
| /** |
| * Return the object keeping track of which elements have had their types promoted. |
| * |
| * @return the object keeping track of which elements have had their types promoted |
| */ |
| TypePromotionManager get promoteManager => _promoteManager; |
| |
| get typeAnalyzer_J2DAccessor => _typeAnalyzer; |
| |
| set typeAnalyzer_J2DAccessor(__v) => _typeAnalyzer = __v; |
| |
| /** |
| * Return the propagated element associated with the given expression whose type can be |
| * overridden, or `null` if there is no element whose type can be overridden. |
| * |
| * @param expression the expression with which the element is associated |
| * @return the element associated with the given expression |
| */ |
| VariableElement getOverridablePropagatedElement(Expression expression) { |
| Element element = null; |
| if (expression is SimpleIdentifier) { |
| element = expression.propagatedElement; |
| } else if (expression is PrefixedIdentifier) { |
| element = expression.propagatedElement; |
| } else if (expression is PropertyAccess) { |
| element = expression.propertyName.propagatedElement; |
| } |
| if (element is VariableElement) { |
| return element as VariableElement; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the static element associated with the given expression whose type can be overridden, or |
| * `null` if there is no element whose type can be overridden. |
| * |
| * @param expression the expression with which the element is associated |
| * @return the element associated with the given expression |
| */ |
| VariableElement getOverridableStaticElement(Expression expression) { |
| Element element = null; |
| if (expression is SimpleIdentifier) { |
| element = expression.staticElement; |
| } else if (expression is PrefixedIdentifier) { |
| element = expression.staticElement; |
| } else if (expression is PropertyAccess) { |
| element = expression.propertyName.staticElement; |
| } |
| if (element is VariableElement) { |
| return element as VariableElement; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the static element associated with the given expression whose type can be promoted, or |
| * `null` if there is no element whose type can be promoted. |
| * |
| * @param expression the expression with which the element is associated |
| * @return the element associated with the given expression |
| */ |
| VariableElement getPromotionStaticElement(Expression expression) { |
| while (expression is ParenthesizedExpression) { |
| expression = (expression as ParenthesizedExpression).expression; |
| } |
| if (expression is! SimpleIdentifier) { |
| return null; |
| } |
| SimpleIdentifier identifier = expression as SimpleIdentifier; |
| Element element = identifier.staticElement; |
| if (element is! VariableElement) { |
| return null; |
| } |
| ElementKind kind = element.kind; |
| if (kind == ElementKind.LOCAL_VARIABLE) { |
| return element as VariableElement; |
| } |
| if (kind == ElementKind.PARAMETER) { |
| return element as VariableElement; |
| } |
| return null; |
| } |
| |
| /** |
| * Prepares this [ResolverVisitor] to using it for incremental resolution. |
| */ |
| void initForIncrementalResolution() { |
| _overrideManager.enterScope(); |
| } |
| |
| /** |
| * If it is appropriate to do so, override the current type of the static and propagated elements |
| * associated with the given expression with the given type. Generally speaking, it is appropriate |
| * if the given type is more specific than the current type. |
| * |
| * @param expression the expression used to access the static and propagated elements whose types |
| * might be overridden |
| * @param potentialType the potential type of the elements |
| * @param allowPrecisionLoss see @{code overrideVariable} docs |
| */ |
| void overrideExpression(Expression expression, DartType potentialType, |
| bool allowPrecisionLoss) { |
| VariableElement element = getOverridableStaticElement(expression); |
| if (element != null) { |
| overrideVariable(element, potentialType, allowPrecisionLoss); |
| } |
| element = getOverridablePropagatedElement(expression); |
| if (element != null) { |
| overrideVariable(element, potentialType, allowPrecisionLoss); |
| } |
| } |
| |
| /** |
| * If it is appropriate to do so, override the current type of the given element with the given |
| * type. |
| * |
| * @param element the element whose type might be overridden |
| * @param potentialType the potential type of the element |
| * @param allowPrecisionLoss true if `potentialType` is allowed to be less precise than the |
| * current best type |
| */ |
| void overrideVariable(VariableElement element, DartType potentialType, |
| bool allowPrecisionLoss) { |
| if (potentialType == null || potentialType.isBottom) { |
| return; |
| } |
| DartType currentType = _overrideManager.getBestType(element); |
| |
| // If we aren't allowing precision loss then the third and fourth conditions |
| // check that we aren't losing precision. |
| // |
| // Let [C] be the current type and [P] be the potential type. When we |
| // aren't allowing precision loss -- which is the case for is-checks -- we |
| // check that [! (C << P)] or [P << C]. The second check, that [P << C], is |
| // analogous to part of the Dart Language Spec rule for type promotion under |
| // is-checks (in the analogy [T] is [P] and [S] is [C]): |
| // |
| // An is-expression of the form [v is T] shows that [v] has type [T] iff |
| // [T] is more specific than the type [S] of the expression [v] and both |
| // [T != dynamic] and [S != dynamic]. |
| // |
| // It also covers an important case that is not applicable in the spec: |
| // for union types, we want an is-check to promote from an union type to |
| // (a subtype of) any of its members. |
| // |
| // The first check, that [! (C << P)], covers the case where [P] and [C] are |
| // unrelated types; This case is not addressed in the spec for static types. |
| if (currentType == null || |
| allowPrecisionLoss || |
| !currentType.isMoreSpecificThan(potentialType) || |
| potentialType.isMoreSpecificThan(currentType)) { |
| // TODO(scheglov) type propagation for instance/top-level fields |
| // was disabled because it depends on the order or visiting. |
| // If both field and its client are in the same unit, and we visit |
| // the client before the field, then propagated type is not set yet. |
| // if (element is PropertyInducingElement) { |
| // PropertyInducingElement variable = element; |
| // if (!variable.isConst && !variable.isFinal) { |
| // return; |
| // } |
| // (variable as PropertyInducingElementImpl).propagatedType = |
| // potentialType; |
| // } |
| _overrideManager.setType(element, potentialType); |
| } |
| } |
| |
| @override |
| Object visitAnnotation(Annotation node) { |
| AstNode parent = node.parent; |
| if (identical(parent, _enclosingClassDeclaration) || |
| identical(parent, _enclosingFunctionTypeAlias)) { |
| return null; |
| } |
| return super.visitAnnotation(node); |
| } |
| |
| @override |
| Object visitAsExpression(AsExpression node) { |
| super.visitAsExpression(node); |
| // Since an as-statement doesn't actually change the type, we don't |
| // let it affect the propagated type when it would result in a loss |
| // of precision. |
| overrideExpression(node.expression, node.type.type, false); |
| return null; |
| } |
| |
| @override |
| Object visitAssertStatement(AssertStatement node) { |
| super.visitAssertStatement(node); |
| _propagateTrueState(node.condition); |
| return null; |
| } |
| |
| @override |
| Object visitBinaryExpression(BinaryExpression node) { |
| sc.TokenType operatorType = node.operator.type; |
| Expression leftOperand = node.leftOperand; |
| Expression rightOperand = node.rightOperand; |
| if (operatorType == sc.TokenType.AMPERSAND_AMPERSAND) { |
| safelyVisit(leftOperand); |
| if (rightOperand != null) { |
| _overrideManager.enterScope(); |
| try { |
| _promoteManager.enterScope(); |
| try { |
| _propagateTrueState(leftOperand); |
| // Type promotion. |
| _promoteTypes(leftOperand); |
| _clearTypePromotionsIfPotentiallyMutatedIn(leftOperand); |
| _clearTypePromotionsIfPotentiallyMutatedIn(rightOperand); |
| _clearTypePromotionsIfAccessedInClosureAndProtentiallyMutated( |
| rightOperand); |
| // Visit right operand. |
| rightOperand.accept(this); |
| } finally { |
| _promoteManager.exitScope(); |
| } |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| } |
| } else if (operatorType == sc.TokenType.BAR_BAR) { |
| safelyVisit(leftOperand); |
| if (rightOperand != null) { |
| _overrideManager.enterScope(); |
| try { |
| _propagateFalseState(leftOperand); |
| rightOperand.accept(this); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| } |
| } else { |
| safelyVisit(leftOperand); |
| safelyVisit(rightOperand); |
| } |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitBlockFunctionBody(BlockFunctionBody node) { |
| safelyVisit(_commentBeforeFunction); |
| _overrideManager.enterScope(); |
| try { |
| super.visitBlockFunctionBody(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitBreakStatement(BreakStatement node) { |
| // |
| // We do not visit the label because it needs to be visited in the context |
| // of the statement. |
| // |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitClassDeclaration(ClassDeclaration node) { |
| // |
| // Resolve the metadata in the library scope. |
| // |
| if (node.metadata != null) { |
| node.metadata.accept(this); |
| } |
| _enclosingClassDeclaration = node; |
| // |
| // Continue the class resolution. |
| // |
| ClassElement outerType = enclosingClass; |
| try { |
| enclosingClass = node.element; |
| _typeAnalyzer.thisType = |
| enclosingClass == null ? null : enclosingClass.type; |
| super.visitClassDeclaration(node); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| } finally { |
| _typeAnalyzer.thisType = outerType == null ? null : outerType.type; |
| enclosingClass = outerType; |
| _enclosingClassDeclaration = null; |
| } |
| return null; |
| } |
| |
| /** |
| * Implementation of this method should be synchronized with |
| * [visitClassDeclaration]. |
| */ |
| visitClassDeclarationIncrementally(ClassDeclaration node) { |
| // |
| // Resolve the metadata in the library scope. |
| // |
| if (node.metadata != null) { |
| node.metadata.accept(this); |
| } |
| _enclosingClassDeclaration = node; |
| // |
| // Continue the class resolution. |
| // |
| enclosingClass = node.element; |
| _typeAnalyzer.thisType = |
| enclosingClass == null ? null : enclosingClass.type; |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| } |
| |
| @override |
| Object visitComment(Comment node) { |
| if (node.parent is FunctionDeclaration || |
| node.parent is ConstructorDeclaration || |
| node.parent is MethodDeclaration) { |
| if (!identical(node, _commentBeforeFunction)) { |
| _commentBeforeFunction = node; |
| return null; |
| } |
| } |
| super.visitComment(node); |
| _commentBeforeFunction = null; |
| return null; |
| } |
| |
| @override |
| Object visitCommentReference(CommentReference node) { |
| // |
| // We do not visit the identifier because it needs to be visited in the |
| // context of the reference. |
| // |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitCompilationUnit(CompilationUnit node) { |
| // |
| // TODO(brianwilkerson) The goal of the code below is to visit the |
| // declarations in such an order that we can infer type information for |
| // top-level variables before we visit references to them. This is better |
| // than making no effort, but still doesn't completely satisfy that goal |
| // (consider for example "final var a = b; final var b = 0;"; we'll infer a |
| // type of 'int' for 'b', but not for 'a' because of the order of the |
| // visits). Ideally we would create a dependency graph, but that would |
| // require references to be resolved, which they are not. |
| // |
| _overrideManager.enterScope(); |
| try { |
| NodeList<Directive> directives = node.directives; |
| int directiveCount = directives.length; |
| for (int i = 0; i < directiveCount; i++) { |
| directives[i].accept(this); |
| } |
| NodeList<CompilationUnitMember> declarations = node.declarations; |
| int declarationCount = declarations.length; |
| for (int i = 0; i < declarationCount; i++) { |
| CompilationUnitMember declaration = declarations[i]; |
| if (declaration is! ClassDeclaration) { |
| declaration.accept(this); |
| } |
| } |
| for (int i = 0; i < declarationCount; i++) { |
| CompilationUnitMember declaration = declarations[i]; |
| if (declaration is ClassDeclaration) { |
| declaration.accept(this); |
| } |
| } |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitConditionalExpression(ConditionalExpression node) { |
| Expression condition = node.condition; |
| safelyVisit(condition); |
| Expression thenExpression = node.thenExpression; |
| if (thenExpression != null) { |
| _overrideManager.enterScope(); |
| try { |
| _promoteManager.enterScope(); |
| try { |
| _propagateTrueState(condition); |
| // Type promotion. |
| _promoteTypes(condition); |
| _clearTypePromotionsIfPotentiallyMutatedIn(thenExpression); |
| _clearTypePromotionsIfAccessedInClosureAndProtentiallyMutated( |
| thenExpression); |
| // Visit "then" expression. |
| thenExpression.accept(this); |
| } finally { |
| _promoteManager.exitScope(); |
| } |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| } |
| Expression elseExpression = node.elseExpression; |
| if (elseExpression != null) { |
| _overrideManager.enterScope(); |
| try { |
| _propagateFalseState(condition); |
| elseExpression.accept(this); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| } |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| bool thenIsAbrupt = _isAbruptTerminationExpression(thenExpression); |
| bool elseIsAbrupt = _isAbruptTerminationExpression(elseExpression); |
| if (elseIsAbrupt && !thenIsAbrupt) { |
| _propagateTrueState(condition); |
| _propagateState(thenExpression); |
| } else if (thenIsAbrupt && !elseIsAbrupt) { |
| _propagateFalseState(condition); |
| _propagateState(elseExpression); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| ExecutableElement outerFunction = _enclosingFunction; |
| try { |
| _enclosingFunction = node.element; |
| super.visitConstructorDeclaration(node); |
| } finally { |
| _enclosingFunction = outerFunction; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitConstructorFieldInitializer(ConstructorFieldInitializer node) { |
| // |
| // We visit the expression, but do not visit the field name because it needs |
| // to be visited in the context of the constructor field initializer node. |
| // |
| safelyVisit(node.expression); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitConstructorName(ConstructorName node) { |
| // |
| // We do not visit either the type name, because it won't be visited anyway, |
| // or the name, because it needs to be visited in the context of the |
| // constructor name. |
| // |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitContinueStatement(ContinueStatement node) { |
| // |
| // We do not visit the label because it needs to be visited in the context |
| // of the statement. |
| // |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitDoStatement(DoStatement node) { |
| _overrideManager.enterScope(); |
| try { |
| super.visitDoStatement(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| // TODO(brianwilkerson) If the loop can only be exited because the condition |
| // is false, then propagateFalseState(node.getCondition()); |
| return null; |
| } |
| |
| @override |
| Object visitEmptyFunctionBody(EmptyFunctionBody node) { |
| safelyVisit(_commentBeforeFunction); |
| if (resolveOnlyCommentInFunctionBody) { |
| return null; |
| } |
| return super.visitEmptyFunctionBody(node); |
| } |
| |
| @override |
| Object visitEnumDeclaration(EnumDeclaration node) { |
| // |
| // Resolve the metadata in the library scope. |
| // |
| if (node.metadata != null) { |
| node.metadata.accept(this); |
| } |
| // |
| // There is nothing else to do because everything else was resolved by the |
| // element builder. |
| // |
| return null; |
| } |
| |
| @override |
| Object visitExpressionFunctionBody(ExpressionFunctionBody node) { |
| safelyVisit(_commentBeforeFunction); |
| if (resolveOnlyCommentInFunctionBody) { |
| return null; |
| } |
| _overrideManager.enterScope(); |
| try { |
| super.visitExpressionFunctionBody(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFieldDeclaration(FieldDeclaration node) { |
| _overrideManager.enterScope(); |
| try { |
| super.visitFieldDeclaration(node); |
| } finally { |
| Map<VariableElement, DartType> overrides = |
| _overrideManager.captureOverrides(node.fields); |
| _overrideManager.exitScope(); |
| _overrideManager.applyOverrides(overrides); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitForEachStatement(ForEachStatement node) { |
| _overrideManager.enterScope(); |
| try { |
| super.visitForEachStatement(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| return null; |
| } |
| |
| @override |
| void visitForEachStatementInScope(ForEachStatement node) { |
| // |
| // We visit the iterator before the loop variable because the loop variable |
| // cannot be in scope while visiting the iterator. |
| // |
| Expression iterable = node.iterable; |
| safelyVisit(iterable); |
| DeclaredIdentifier loopVariable = node.loopVariable; |
| SimpleIdentifier identifier = node.identifier; |
| safelyVisit(loopVariable); |
| safelyVisit(identifier); |
| Statement body = node.body; |
| if (body != null) { |
| _overrideManager.enterScope(); |
| try { |
| if (loopVariable != null && iterable != null) { |
| LocalVariableElement loopElement = loopVariable.element; |
| if (loopElement != null) { |
| DartType iteratorElementType = _getIteratorElementType(iterable); |
| overrideVariable(loopElement, iteratorElementType, true); |
| _recordPropagatedType(loopVariable.identifier, iteratorElementType); |
| } |
| } else if (identifier != null && iterable != null) { |
| Element identifierElement = identifier.staticElement; |
| if (identifierElement is VariableElement) { |
| DartType iteratorElementType = _getIteratorElementType(iterable); |
| overrideVariable(identifierElement, iteratorElementType, true); |
| _recordPropagatedType(identifier, iteratorElementType); |
| } |
| } |
| visitStatementInScope(body); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| } |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| } |
| |
| @override |
| Object visitForStatement(ForStatement node) { |
| _overrideManager.enterScope(); |
| try { |
| super.visitForStatement(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| return null; |
| } |
| |
| @override |
| void visitForStatementInScope(ForStatement node) { |
| safelyVisit(node.variables); |
| safelyVisit(node.initialization); |
| safelyVisit(node.condition); |
| _overrideManager.enterScope(); |
| try { |
| _propagateTrueState(node.condition); |
| visitStatementInScope(node.body); |
| node.updaters.accept(this); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| // TODO(brianwilkerson) If the loop can only be exited because the condition |
| // is false, then propagateFalseState(condition); |
| } |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) { |
| ExecutableElement outerFunction = _enclosingFunction; |
| try { |
| SimpleIdentifier functionName = node.name; |
| _enclosingFunction = functionName.staticElement as ExecutableElement; |
| super.visitFunctionDeclaration(node); |
| } finally { |
| _enclosingFunction = outerFunction; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFunctionExpression(FunctionExpression node) { |
| ExecutableElement outerFunction = _enclosingFunction; |
| try { |
| _enclosingFunction = node.element; |
| _overrideManager.enterScope(); |
| try { |
| super.visitFunctionExpression(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| } finally { |
| _enclosingFunction = outerFunction; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFunctionExpressionInvocation(FunctionExpressionInvocation node) { |
| safelyVisit(node.function); |
| node.accept(_elementResolver); |
| _inferFunctionExpressionsParametersTypes(node.argumentList); |
| safelyVisit(node.argumentList); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitFunctionTypeAlias(FunctionTypeAlias node) { |
| // Resolve the metadata in the library scope. |
| if (node.metadata != null) { |
| node.metadata.accept(this); |
| } |
| FunctionTypeAlias outerAlias = _enclosingFunctionTypeAlias; |
| _enclosingFunctionTypeAlias = node; |
| try { |
| super.visitFunctionTypeAlias(node); |
| } finally { |
| _enclosingFunctionTypeAlias = outerAlias; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitHideCombinator(HideCombinator node) => null; |
| |
| @override |
| Object visitIfStatement(IfStatement node) { |
| Expression condition = node.condition; |
| safelyVisit(condition); |
| Map<VariableElement, DartType> thenOverrides = |
| new HashMap<VariableElement, DartType>(); |
| Statement thenStatement = node.thenStatement; |
| if (thenStatement != null) { |
| _overrideManager.enterScope(); |
| try { |
| _promoteManager.enterScope(); |
| try { |
| _propagateTrueState(condition); |
| // Type promotion. |
| _promoteTypes(condition); |
| _clearTypePromotionsIfPotentiallyMutatedIn(thenStatement); |
| _clearTypePromotionsIfAccessedInClosureAndProtentiallyMutated( |
| thenStatement); |
| // Visit "then". |
| visitStatementInScope(thenStatement); |
| } finally { |
| _promoteManager.exitScope(); |
| } |
| } finally { |
| thenOverrides = _overrideManager.captureLocalOverrides(); |
| _overrideManager.exitScope(); |
| } |
| } |
| Map<VariableElement, DartType> elseOverrides = |
| new HashMap<VariableElement, DartType>(); |
| Statement elseStatement = node.elseStatement; |
| if (elseStatement != null) { |
| _overrideManager.enterScope(); |
| try { |
| _propagateFalseState(condition); |
| visitStatementInScope(elseStatement); |
| } finally { |
| elseOverrides = _overrideManager.captureLocalOverrides(); |
| _overrideManager.exitScope(); |
| } |
| } |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| // Join overrides. |
| bool thenIsAbrupt = _isAbruptTerminationStatement(thenStatement); |
| bool elseIsAbrupt = _isAbruptTerminationStatement(elseStatement); |
| if (elseIsAbrupt && !thenIsAbrupt) { |
| _propagateTrueState(condition); |
| _overrideManager.applyOverrides(thenOverrides); |
| } else if (thenIsAbrupt && !elseIsAbrupt) { |
| _propagateFalseState(condition); |
| _overrideManager.applyOverrides(elseOverrides); |
| } else if (!thenIsAbrupt && !elseIsAbrupt) { |
| if (AnalysisEngine.instance.enableUnionTypes) { |
| List<Map<VariableElement, DartType>> perBranchOverrides = |
| new List<Map<VariableElement, DartType>>(); |
| perBranchOverrides.add(thenOverrides); |
| perBranchOverrides.add(elseOverrides); |
| _overrideManager.joinOverrides(perBranchOverrides); |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitLabel(Label node) => null; |
| |
| @override |
| Object visitLibraryIdentifier(LibraryIdentifier node) => null; |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| ExecutableElement outerFunction = _enclosingFunction; |
| try { |
| _enclosingFunction = node.element; |
| super.visitMethodDeclaration(node); |
| } finally { |
| _enclosingFunction = outerFunction; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitMethodInvocation(MethodInvocation node) { |
| // |
| // We visit the target and argument list, but do not visit the method name |
| // because it needs to be visited in the context of the invocation. |
| // |
| safelyVisit(node.target); |
| node.accept(_elementResolver); |
| _inferFunctionExpressionsParametersTypes(node.argumentList); |
| safelyVisit(node.argumentList); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitNode(AstNode node) { |
| node.visitChildren(this); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitPrefixedIdentifier(PrefixedIdentifier node) { |
| // |
| // We visit the prefix, but do not visit the identifier because it needs to |
| // be visited in the context of the prefix. |
| // |
| safelyVisit(node.prefix); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitPropertyAccess(PropertyAccess node) { |
| // |
| // We visit the target, but do not visit the property name because it needs |
| // to be visited in the context of the property access node. |
| // |
| safelyVisit(node.target); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object |
| visitRedirectingConstructorInvocation(RedirectingConstructorInvocation node) { |
| // |
| // We visit the argument list, but do not visit the optional identifier |
| // because it needs to be visited in the context of the constructor |
| // invocation. |
| // |
| safelyVisit(node.argumentList); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitShowCombinator(ShowCombinator node) => null; |
| |
| @override |
| Object visitSuperConstructorInvocation(SuperConstructorInvocation node) { |
| // |
| // We visit the argument list, but do not visit the optional identifier |
| // because it needs to be visited in the context of the constructor |
| // invocation. |
| // |
| safelyVisit(node.argumentList); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| @override |
| Object visitSwitchCase(SwitchCase node) { |
| _overrideManager.enterScope(); |
| try { |
| super.visitSwitchCase(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitSwitchDefault(SwitchDefault node) { |
| _overrideManager.enterScope(); |
| try { |
| super.visitSwitchDefault(node); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) { |
| _overrideManager.enterScope(); |
| try { |
| super.visitTopLevelVariableDeclaration(node); |
| } finally { |
| Map<VariableElement, DartType> overrides = |
| _overrideManager.captureOverrides(node.variables); |
| _overrideManager.exitScope(); |
| _overrideManager.applyOverrides(overrides); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitTypeName(TypeName node) => null; |
| |
| @override |
| Object visitWhileStatement(WhileStatement node) { |
| // Note: since we don't call the base class, we have to maintain |
| // _implicitLabelScope ourselves. |
| ImplicitLabelScope outerImplicitScope = _implicitLabelScope; |
| try { |
| _implicitLabelScope = _implicitLabelScope.nest(node); |
| Expression condition = node.condition; |
| safelyVisit(condition); |
| Statement body = node.body; |
| if (body != null) { |
| _overrideManager.enterScope(); |
| try { |
| _propagateTrueState(condition); |
| visitStatementInScope(body); |
| } finally { |
| _overrideManager.exitScope(); |
| } |
| } |
| } finally { |
| _implicitLabelScope = outerImplicitScope; |
| } |
| // TODO(brianwilkerson) If the loop can only be exited because the condition |
| // is false, then propagateFalseState(condition); |
| node.accept(_elementResolver); |
| node.accept(_typeAnalyzer); |
| return null; |
| } |
| |
| /** |
| * Checks each promoted variable in the current scope for compliance with the following |
| * specification statement: |
| * |
| * If the variable <i>v</i> is accessed by a closure in <i>s<sub>1</sub></i> then the variable |
| * <i>v</i> is not potentially mutated anywhere in the scope of <i>v</i>. |
| */ |
| void |
| _clearTypePromotionsIfAccessedInClosureAndProtentiallyMutated(AstNode target) { |
| for (Element element in _promoteManager.promotedElements) { |
| if ((element as VariableElementImpl).isPotentiallyMutatedInScope) { |
| if (_isVariableAccessedInClosure(element, target)) { |
| _promoteManager.setType(element, null); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Checks each promoted variable in the current scope for compliance with the following |
| * specification statement: |
| * |
| * <i>v</i> is not potentially mutated in <i>s<sub>1</sub></i> or within a closure. |
| */ |
| void _clearTypePromotionsIfPotentiallyMutatedIn(AstNode target) { |
| for (Element element in _promoteManager.promotedElements) { |
| if (_isVariablePotentiallyMutatedIn(element, target)) { |
| _promoteManager.setType(element, null); |
| } |
| } |
| } |
| |
| /** |
| * The given expression is the expression used to compute the iterator for a for-each statement. |
| * Attempt to compute the type of objects that will be assigned to the loop variable and return |
| * that type. Return `null` if the type could not be determined. |
| * |
| * @param iterator the iterator for a for-each statement |
| * @return the type of objects that will be assigned to the loop variable |
| */ |
| DartType _getIteratorElementType(Expression iteratorExpression) { |
| DartType expressionType = iteratorExpression.bestType; |
| if (expressionType is InterfaceType) { |
| InterfaceType interfaceType = expressionType; |
| FunctionType iteratorFunction = |
| _inheritanceManager.lookupMemberType(interfaceType, "iterator"); |
| if (iteratorFunction == null) { |
| // TODO(brianwilkerson) Should we report this error? |
| return null; |
| } |
| DartType iteratorType = iteratorFunction.returnType; |
| if (iteratorType is InterfaceType) { |
| InterfaceType iteratorInterfaceType = iteratorType; |
| FunctionType currentFunction = |
| _inheritanceManager.lookupMemberType(iteratorInterfaceType, "current"); |
| if (currentFunction == null) { |
| // TODO(brianwilkerson) Should we report this error? |
| return null; |
| } |
| return currentFunction.returnType; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * If given "mayBeClosure" is [FunctionExpression] without explicit parameters types and its |
| * required type is [FunctionType], then infer parameters types from [FunctionType]. |
| */ |
| void _inferFunctionExpressionParametersTypes(Expression mayBeClosure, |
| DartType mayByFunctionType) { |
| // prepare closure |
| if (mayBeClosure is! FunctionExpression) { |
| return; |
| } |
| FunctionExpression closure = mayBeClosure as FunctionExpression; |
| // prepare expected closure type |
| if (mayByFunctionType is! FunctionType) { |
| return; |
| } |
| FunctionType expectedClosureType = mayByFunctionType as FunctionType; |
| // If the expectedClosureType is not more specific than the static type, |
| // return. |
| DartType staticClosureType = |
| (closure.element != null ? closure.element.type : null) as DartType; |
| if (staticClosureType != null && |
| !expectedClosureType.isMoreSpecificThan(staticClosureType)) { |
| return; |
| } |
| // set propagated type for the closure |
| closure.propagatedType = expectedClosureType; |
| // set inferred types for parameters |
| NodeList<FormalParameter> parameters = closure.parameters.parameters; |
| List<ParameterElement> expectedParameters = expectedClosureType.parameters; |
| for (int i = |
| 0; i < parameters.length && i < expectedParameters.length; i++) { |
| FormalParameter parameter = parameters[i]; |
| ParameterElement element = parameter.element; |
| DartType currentType = _overrideManager.getBestType(element); |
| // may be override the type |
| DartType expectedType = expectedParameters[i].type; |
| if (currentType == null || expectedType.isMoreSpecificThan(currentType)) { |
| _overrideManager.setType(element, expectedType); |
| } |
| } |
| } |
| |
| /** |
| * Try to infer types of parameters of the [FunctionExpression] arguments. |
| */ |
| void _inferFunctionExpressionsParametersTypes(ArgumentList argumentList) { |
| for (Expression argument in argumentList.arguments) { |
| ParameterElement parameter = argument.propagatedParameterElement; |
| if (parameter == null) { |
| parameter = argument.staticParameterElement; |
| } |
| if (parameter != null) { |
| _inferFunctionExpressionParametersTypes(argument, parameter.type); |
| } |
| } |
| } |
| |
| /** |
| * Return `true` if the given expression terminates abruptly (that is, if any expression |
| * following the given expression will not be reached). |
| * |
| * @param expression the expression being tested |
| * @return `true` if the given expression terminates abruptly |
| */ |
| bool _isAbruptTerminationExpression(Expression expression) { |
| // TODO(brianwilkerson) This needs to be significantly improved. Ideally we |
| // would eventually turn this into a method on Expression that returns a |
| // termination indication (normal, abrupt with no exception, abrupt with an |
| // exception). |
| while (expression is ParenthesizedExpression) { |
| expression = (expression as ParenthesizedExpression).expression; |
| } |
| return expression is ThrowExpression || expression is RethrowExpression; |
| } |
| |
| /** |
| * Return `true` if the given statement terminates abruptly (that is, if any statement |
| * following the given statement will not be reached). |
| * |
| * @param statement the statement being tested |
| * @return `true` if the given statement terminates abruptly |
| */ |
| bool _isAbruptTerminationStatement(Statement statement) { |
| // TODO(brianwilkerson) This needs to be significantly improved. Ideally we |
| // would eventually turn this into a method on Statement that returns a |
| // termination indication (normal, abrupt with no exception, abrupt with an |
| // exception). |
| // |
| // collinsn: it is unsound to assume that [break] and [continue] are |
| // "abrupt". See: https://code.google.com/p/dart/issues/detail?id=19929#c4 |
| // (tests are included in TypePropagationTest.java). |
| // In general, the difficulty is loopy control flow. |
| // |
| // In the presence of exceptions things become much more complicated, but |
| // while we only use this to propagate at [if]-statement join points, |
| // checking for [return] may work well enough in the common case. |
| if (statement is ReturnStatement) { |
| return true; |
| } else if (statement is ExpressionStatement) { |
| return _isAbruptTerminationExpression(statement.expression); |
| } else if (statement is Block) { |
| NodeList<Statement> statements = statement.statements; |
| int size = statements.length; |
| if (size == 0) { |
| return false; |
| } |
| |
| |
| // This last-statement-is-return heuristic is unsound for adversarial |
| // code, but probably works well in the common case: |
| // |
| // var x = 123; |
| // var c = true; |
| // L: if (c) { |
| // x = "hello"; |
| // c = false; |
| // break L; |
| // return; |
| // } |
| // print(x); |
| // |
| // Unsound to assume that [x = "hello";] never executed after the |
| // if-statement. Of course, a dead-code analysis could point out that |
| // [return] here is dead. |
| return _isAbruptTerminationStatement(statements[size - 1]); |
| } |
| return false; |
| } |
| |
| /** |
| * Return `true` if the given variable is accessed within a closure in the given |
| * [AstNode] and also mutated somewhere in variable scope. This information is only |
| * available for local variables (including parameters). |
| * |
| * @param variable the variable to check |
| * @param target the [AstNode] to check within |
| * @return `true` if this variable is potentially mutated somewhere in the given ASTNode |
| */ |
| bool _isVariableAccessedInClosure(Element variable, AstNode target) { |
| _ResolverVisitor_isVariableAccessedInClosure visitor = |
| new _ResolverVisitor_isVariableAccessedInClosure(variable); |
| target.accept(visitor); |
| return visitor.result; |
| } |
| |
| /** |
| * Return `true` if the given variable is potentially mutated somewhere in the given |
| * [AstNode]. This information is only available for local variables (including parameters). |
| * |
| * @param variable the variable to check |
| * @param target the [AstNode] to check within |
| * @return `true` if this variable is potentially mutated somewhere in the given ASTNode |
| */ |
| bool _isVariablePotentiallyMutatedIn(Element variable, AstNode target) { |
| _ResolverVisitor_isVariablePotentiallyMutatedIn visitor = |
| new _ResolverVisitor_isVariablePotentiallyMutatedIn(variable); |
| target.accept(visitor); |
| return visitor.result; |
| } |
| |
| /** |
| * If it is appropriate to do so, promotes the current type of the static element associated with |
| * the given expression with the given type. Generally speaking, it is appropriate if the given |
| * type is more specific than the current type. |
| * |
| * @param expression the expression used to access the static element whose types might be |
| * promoted |
| * @param potentialType the potential type of the elements |
| */ |
| void _promote(Expression expression, DartType potentialType) { |
| VariableElement element = getPromotionStaticElement(expression); |
| if (element != null) { |
| // may be mutated somewhere in closure |
| if ((element as VariableElementImpl).isPotentiallyMutatedInClosure) { |
| return; |
| } |
| // prepare current variable type |
| DartType type = _promoteManager.getType(element); |
| if (type == null) { |
| type = expression.staticType; |
| } |
| // Declared type should not be "dynamic". |
| if (type == null || type.isDynamic) { |
| return; |
| } |
| // Promoted type should not be "dynamic". |
| if (potentialType == null || potentialType.isDynamic) { |
| return; |
| } |
| // Promoted type should be more specific than declared. |
| if (!potentialType.isMoreSpecificThan(type)) { |
| return; |
| } |
| // Do promote type of variable. |
| _promoteManager.setType(element, potentialType); |
| } |
| } |
| |
| /** |
| * Promotes type information using given condition. |
| */ |
| void _promoteTypes(Expression condition) { |
| if (condition is BinaryExpression) { |
| BinaryExpression binary = condition; |
| if (binary.operator.type == sc.TokenType.AMPERSAND_AMPERSAND) { |
| Expression left = binary.leftOperand; |
| Expression right = binary.rightOperand; |
| _promoteTypes(left); |
| _promoteTypes(right); |
| _clearTypePromotionsIfPotentiallyMutatedIn(right); |
| } |
| } else if (condition is IsExpression) { |
| IsExpression is2 = condition; |
| if (is2.notOperator == null) { |
| _promote(is2.expression, is2.type.type); |
| } |
| } else if (condition is ParenthesizedExpression) { |
| _promoteTypes(condition.expression); |
| } |
| } |
| |
| /** |
| * Propagate any type information that results from knowing that the given condition will have |
| * been evaluated to 'false'. |
| * |
| * @param condition the condition that will have evaluated to 'false' |
| */ |
| void _propagateFalseState(Expression condition) { |
| if (condition is BinaryExpression) { |
| BinaryExpression binary = condition; |
| if (binary.operator.type == sc.TokenType.BAR_BAR) { |
| _propagateFalseState(binary.leftOperand); |
| _propagateFalseState(binary.rightOperand); |
| } |
| } else if (condition is IsExpression) { |
| IsExpression is2 = condition; |
| if (is2.notOperator != null) { |
| // Since an is-statement doesn't actually change the type, we don't |
| // let it affect the propagated type when it would result in a loss |
| // of precision. |
| overrideExpression(is2.expression, is2.type.type, false); |
| } |
| } else if (condition is PrefixExpression) { |
| PrefixExpression prefix = condition; |
| if (prefix.operator.type == sc.TokenType.BANG) { |
| _propagateTrueState(prefix.operand); |
| } |
| } else if (condition is ParenthesizedExpression) { |
| _propagateFalseState(condition.expression); |
| } |
| } |
| |
| /** |
| * Propagate any type information that results from knowing that the given expression will have |
| * been evaluated without altering the flow of execution. |
| * |
| * @param expression the expression that will have been evaluated |
| */ |
| void _propagateState(Expression expression) { |
| // TODO(brianwilkerson) Implement this. |
| } |
| |
| /** |
| * Propagate any type information that results from knowing that the given condition will have |
| * been evaluated to 'true'. |
| * |
| * @param condition the condition that will have evaluated to 'true' |
| */ |
| void _propagateTrueState(Expression condition) { |
| if (condition is BinaryExpression) { |
| BinaryExpression binary = condition; |
| if (binary.operator.type == sc.TokenType.AMPERSAND_AMPERSAND) { |
| _propagateTrueState(binary.leftOperand); |
| _propagateTrueState(binary.rightOperand); |
| } |
| } else if (condition is IsExpression) { |
| IsExpression is2 = condition; |
| if (is2.notOperator == null) { |
| // Since an is-statement doesn't actually change the type, we don't |
| // let it affect the propagated type when it would result in a loss |
| // of precision. |
| overrideExpression(is2.expression, is2.type.type, false); |
| } |
| } else if (condition is PrefixExpression) { |
| PrefixExpression prefix = condition; |
| if (prefix.operator.type == sc.TokenType.BANG) { |
| _propagateFalseState(prefix.operand); |
| } |
| } else if (condition is ParenthesizedExpression) { |
| _propagateTrueState(condition.expression); |
| } |
| } |
| |
| /** |
| * Record that the propagated type of the given node is the given type. |
| * |
| * @param expression the node whose type is to be recorded |
| * @param type the propagated type of the node |
| */ |
| void _recordPropagatedType(Expression expression, DartType type) { |
| if (type != null && !type.isDynamic) { |
| expression.propagatedType = type; |
| } |
| } |
| } |
| |
| /** |
| * The abstract class `Scope` defines the behavior common to name scopes used by the resolver |
| * to determine which names are visible at any given point in the code. |
| */ |
| abstract class Scope { |
| /** |
| * The prefix used to mark an identifier as being private to its library. |
| */ |
| static int PRIVATE_NAME_PREFIX = 0x5F; |
| |
| /** |
| * The suffix added to the declared name of a setter when looking up the setter. Used to |
| * disambiguate between a getter and a setter that have the same name. |
| */ |
| static String SETTER_SUFFIX = "="; |
| |
| /** |
| * The name used to look up the method used to implement the unary minus operator. Used to |
| * disambiguate between the unary and binary operators. |
| */ |
| static String UNARY_MINUS = "unary-"; |
| |
| /** |
| * A table mapping names that are defined in this scope to the element representing the thing |
| * declared with that name. |
| */ |
| HashMap<String, Element> _definedNames = new HashMap<String, Element>(); |
| |
| /** |
| * A flag indicating whether there are any names defined in this scope. |
| */ |
| bool _hasName = false; |
| |
| /** |
| * Return the scope in which this scope is lexically enclosed. |
| * |
| * @return the scope in which this scope is lexically enclosed |
| */ |
| Scope get enclosingScope => null; |
| |
| /** |
| * Return the listener that is to be informed when an error is encountered. |
| * |
| * @return the listener that is to be informed when an error is encountered |
| */ |
| AnalysisErrorListener get errorListener; |
| |
| /** |
| * Add the given element to this scope. If there is already an element with the given name defined |
| * in this scope, then an error will be generated and the original element will continue to be |
| * mapped to the name. If there is an element with the given name in an enclosing scope, then a |
| * warning will be generated but the given element will hide the inherited element. |
| * |
| * @param element the element to be added to this scope |
| */ |
| void define(Element element) { |
| String name = _getName(element); |
| if (name != null && !name.isEmpty) { |
| if (_definedNames.containsKey(name)) { |
| errorListener.onError( |
| getErrorForDuplicate(_definedNames[name], element)); |
| } else { |
| _definedNames[name] = element; |
| _hasName = true; |
| } |
| } |
| } |
| |
| /** |
| * Add the given element to this scope without checking for duplication or hiding. |
| * |
| * @param name the name of the element to be added |
| * @param element the element to be added to this scope |
| */ |
| void defineNameWithoutChecking(String name, Element element) { |
| _definedNames[name] = element; |
| _hasName = true; |
| } |
| |
| /** |
| * Add the given element to this scope without checking for duplication or hiding. |
| * |
| * @param element the element to be added to this scope |
| */ |
| void defineWithoutChecking(Element element) { |
| _definedNames[_getName(element)] = element; |
| _hasName = true; |
| } |
| |
| /** |
| * Return the error code to be used when reporting that a name being defined locally conflicts |
| * with another element of the same name in the local scope. |
| * |
| * @param existing the first element to be declared with the conflicting name |
| * @param duplicate another element declared with the conflicting name |
| * @return the error code used to report duplicate names within a scope |
| */ |
| AnalysisError getErrorForDuplicate(Element existing, Element duplicate) { |
| // TODO(brianwilkerson) Customize the error message based on the types of |
| // elements that share the same name. |
| // TODO(jwren) There are 4 error codes for duplicate, but only 1 is being |
| // generated. |
| Source source = duplicate.source; |
| return new AnalysisError.con2( |
| source, |
| duplicate.nameOffset, |
| duplicate.displayName.length, |
| CompileTimeErrorCode.DUPLICATE_DEFINITION, |
| [existing.displayName]); |
| } |
| |
| /** |
| * Return the source that contains the given identifier, or the source associated with this scope |
| * if the source containing the identifier could not be determined. |
| * |
| * @param identifier the identifier whose source is to be returned |
| * @return the source that contains the given identifier |
| */ |
| Source getSource(AstNode node) { |
| CompilationUnit unit = node.getAncestor((node) => node is CompilationUnit); |
| if (unit != null) { |
| CompilationUnitElement unitElement = unit.element; |
| if (unitElement != null) { |
| return unitElement.source; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Return the element with which the given name is associated, or `null` if the name is not |
| * defined within this scope. |
| * |
| * @param identifier the identifier node to lookup element for, used to report correct kind of a |
| * problem and associate problem with |
| * @param name the name associated with the element to be returned |
| * @param referencingLibrary the library that contains the reference to the name, used to |
| * implement library-level privacy |
| * @return the element with which the given name is associated |
| */ |
| Element internalLookup(Identifier identifier, String name, |
| LibraryElement referencingLibrary); |
| |
| /** |
| * Return the element with which the given name is associated, or `null` if the name is not |
| * defined within this scope. This method only returns elements that are directly defined within |
| * this scope, not elements that are defined in an enclosing scope. |
| * |
| * @param name the name associated with the element to be returned |
| * @param referencingLibrary the library that contains the reference to the name, used to |
| * implement library-level privacy |
| * @return the element with which the given name is associated |
| */ |
| Element localLookup(String name, LibraryElement referencingLibrary) { |
| if (_hasName) { |
| return _definedNames[name]; |
| } |
| return null; |
| } |
| |
| /** |
| * Return the element with which the given identifier is associated, or `null` if the name |
| * is not defined within this scope. |
| * |
| * @param identifier the identifier associated with the element to be returned |
| * @param referencingLibrary the library that contains the reference to the name, used to |
| * implement library-level privacy |
| * @return the element with which the given identifier is associated |
| */ |
| Element lookup(Identifier identifier, LibraryElement referencingLibrary) => |
| internalLookup(identifier, identifier.name, referencingLibrary); |
| |
| /** |
| * Return the name that will be used to look up the given element. |
| * |
| * @param element the element whose look-up name is to be returned |
| * @return the name that will be used to look up the given element |
| */ |
| String _getName(Element element) { |
| if (element is MethodElement) { |
| MethodElement method = element; |
| if (method.name == "-" && method.parameters.length == 0) { |
| return UNARY_MINUS; |
| } |
| } |
| return element.name; |
| } |
| |
| /** |
| * Return `true` if the given name is a library-private name. |
| * |
| * @param name the name being tested |
| * @return `true` if the given name is a library-private name |
| */ |
| static bool isPrivateName(String name) => |
| name != null && StringUtilities.startsWithChar(name, PRIVATE_NAME_PREFIX); |
| } |
| |
| /** |
| * The abstract class `ScopedVisitor` maintains name and label scopes as an AST structure is |
| * being visited. |
| */ |
| abstract class ScopedVisitor extends UnifyingAstVisitor<Object> { |
| /** |
| * The element for the library containing the compilation unit being visited. |
| */ |
| LibraryElement _definingLibrary; |
| |
| /** |
| * The source representing the compilation unit being visited. |
| */ |
| final Source source; |
| |
| /** |
| * The error listener that will be informed of any errors that are found during resolution. |
| */ |
| AnalysisErrorListener _errorListener; |
| |
| /** |
| * The scope used to resolve identifiers. |
| */ |
| Scope _nameScope; |
| |
| /** |
| * The object used to access the types from the core library. |
| */ |
| final TypeProvider typeProvider; |
| |
| /** |
| * The scope used to resolve unlabeled `break` and `continue` statements. |
| */ |
| ImplicitLabelScope _implicitLabelScope = ImplicitLabelScope.ROOT; |
| |
| /** |
| * The scope used to resolve labels for `break` and `continue` statements, or |
| * `null` if no labels have been defined in the current context. |
| */ |
| LabelScope _labelScope; |
| |
| /** |
| * The class containing the AST nodes being visited, |
| * or `null` if we are not in the scope of a class. |
| */ |
| ClassElement enclosingClass; |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| ScopedVisitor.con1(Library library, this.source, this.typeProvider) { |
| this._definingLibrary = library.libraryElement; |
| LibraryScope libraryScope = library.libraryScope; |
| this._errorListener = libraryScope.errorListener; |
| this._nameScope = libraryScope; |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param definingLibrary the element for the library containing the compilation unit being |
| * visited |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| * @param errorListener the error listener that will be informed of any errors that are found |
| * during resolution |
| */ |
| ScopedVisitor.con2(LibraryElement definingLibrary, this.source, |
| this.typeProvider, AnalysisErrorListener errorListener) { |
| this._definingLibrary = definingLibrary; |
| this._errorListener = errorListener; |
| this._nameScope = new LibraryScope(definingLibrary, errorListener); |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param definingLibrary the element for the library containing the compilation unit being |
| * visited |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| * @param nameScope the scope used to resolve identifiers in the node that will first be visited |
| * @param errorListener the error listener that will be informed of any errors that are found |
| * during resolution |
| */ |
| ScopedVisitor.con3(LibraryElement definingLibrary, this.source, |
| this.typeProvider, Scope nameScope, AnalysisErrorListener errorListener) { |
| this._definingLibrary = definingLibrary; |
| this._errorListener = errorListener; |
| this._nameScope = nameScope; |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| ScopedVisitor.con4(ResolvableLibrary library, this.source, this.typeProvider) |
| { |
| this._definingLibrary = library.libraryElement; |
| LibraryScope libraryScope = library.libraryScope; |
| this._errorListener = libraryScope.errorListener; |
| this._nameScope = libraryScope; |
| } |
| |
| /** |
| * Return the library element for the library containing the compilation unit being resolved. |
| * |
| * @return the library element for the library containing the compilation unit being resolved |
| */ |
| LibraryElement get definingLibrary => _definingLibrary; |
| |
| /** |
| * Return the implicit label scope in which the current node is being |
| * resolved. |
| */ |
| ImplicitLabelScope get implicitLabelScope => _implicitLabelScope; |
| |
| /** |
| * Return the label scope in which the current node is being resolved. |
| * |
| * @return the label scope in which the current node is being resolved |
| */ |
| LabelScope get labelScope => _labelScope; |
| |
| /** |
| * Return the name scope in which the current node is being resolved. |
| * |
| * @return the name scope in which the current node is being resolved |
| */ |
| Scope get nameScope => _nameScope; |
| |
| /** |
| * Replaces the current [Scope] with the enclosing [Scope]. |
| * |
| * @return the enclosing [Scope]. |
| */ |
| Scope popNameScope() { |
| _nameScope = _nameScope.enclosingScope; |
| return _nameScope; |
| } |
| |
| /** |
| * Pushes a new [Scope] into the visitor. |
| * |
| * @return the new [Scope]. |
| */ |
| Scope pushNameScope() { |
| Scope newScope = new EnclosedScope(_nameScope); |
| _nameScope = newScope; |
| return _nameScope; |
| } |
| |
| /** |
| * Report an error with the given error code and arguments. |
| * |
| * @param errorCode the error code of the error to be reported |
| * @param node the node specifying the location of the error |
| * @param arguments the arguments to the error, used to compose the error message |
| */ |
| void reportErrorForNode(ErrorCode errorCode, AstNode node, |
| [List<Object> arguments]) { |
| _errorListener.onError( |
| new AnalysisError.con2(source, node.offset, node.length, errorCode, arguments)); |
| } |
| |
| /** |
| * Report an error with the given error code and arguments. |
| * |
| * @param errorCode the error code of the error to be reported |
| * @param offset the offset of the location of the error |
| * @param length the length of the location of the error |
| * @param arguments the arguments to the error, used to compose the error message |
| */ |
| void reportErrorForOffset(ErrorCode errorCode, int offset, int length, |
| [List<Object> arguments]) { |
| _errorListener.onError( |
| new AnalysisError.con2(source, offset, length, errorCode, arguments)); |
| } |
| |
| /** |
| * Report an error with the given error code and arguments. |
| * |
| * @param errorCode the error code of the error to be reported |
| * @param token the token specifying the location of the error |
| * @param arguments the arguments to the error, used to compose the error message |
| */ |
| void reportErrorForToken(ErrorCode errorCode, sc.Token token, |
| [List<Object> arguments]) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| source, |
| token.offset, |
| token.length, |
| errorCode, |
| arguments)); |
| } |
| |
| /** |
| * Visit the given AST node if it is not null. |
| * |
| * @param node the node to be visited |
| */ |
| void safelyVisit(AstNode node) { |
| if (node != null) { |
| node.accept(this); |
| } |
| } |
| |
| @override |
| Object visitBlock(Block node) { |
| Scope outerScope = _nameScope; |
| try { |
| EnclosedScope enclosedScope = new EnclosedScope(_nameScope); |
| _hideNamesDefinedInBlock(enclosedScope, node); |
| _nameScope = enclosedScope; |
| super.visitBlock(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitBlockFunctionBody(BlockFunctionBody node) { |
| ImplicitLabelScope implicitOuterScope = _implicitLabelScope; |
| try { |
| _implicitLabelScope = ImplicitLabelScope.ROOT; |
| super.visitBlockFunctionBody(node); |
| } finally { |
| _implicitLabelScope = implicitOuterScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitCatchClause(CatchClause node) { |
| SimpleIdentifier exception = node.exceptionParameter; |
| if (exception != null) { |
| Scope outerScope = _nameScope; |
| try { |
| _nameScope = new EnclosedScope(_nameScope); |
| _nameScope.define(exception.staticElement); |
| SimpleIdentifier stackTrace = node.stackTraceParameter; |
| if (stackTrace != null) { |
| _nameScope.define(stackTrace.staticElement); |
| } |
| super.visitCatchClause(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| } else { |
| super.visitCatchClause(node); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitClassDeclaration(ClassDeclaration node) { |
| ClassElement classElement = node.element; |
| Scope outerScope = _nameScope; |
| try { |
| if (classElement == null) { |
| AnalysisEngine.instance.logger.logInformation( |
| "Missing element for class declaration ${node.name.name} in ${definingLibrary.source.fullName}", |
| new CaughtException(new AnalysisException(), null)); |
| super.visitClassDeclaration(node); |
| } else { |
| ClassElement outerClass = enclosingClass; |
| try { |
| enclosingClass = node.element; |
| _nameScope = new TypeParameterScope(_nameScope, classElement); |
| visitClassDeclarationInScope(node); |
| _nameScope = new ClassScope(_nameScope, classElement); |
| visitClassMembersInScope(node); |
| } finally { |
| enclosingClass = outerClass; |
| } |
| } |
| } finally { |
| _nameScope = outerScope; |
| } |
| return null; |
| } |
| |
| void visitClassDeclarationInScope(ClassDeclaration node) { |
| safelyVisit(node.name); |
| safelyVisit(node.typeParameters); |
| safelyVisit(node.extendsClause); |
| safelyVisit(node.withClause); |
| safelyVisit(node.implementsClause); |
| safelyVisit(node.nativeClause); |
| } |
| |
| void visitClassMembersInScope(ClassDeclaration node) { |
| safelyVisit(node.documentationComment); |
| node.metadata.accept(this); |
| node.members.accept(this); |
| } |
| |
| @override |
| Object visitClassTypeAlias(ClassTypeAlias node) { |
| Scope outerScope = _nameScope; |
| try { |
| ClassElement element = node.element; |
| _nameScope = |
| new ClassScope(new TypeParameterScope(_nameScope, element), element); |
| super.visitClassTypeAlias(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| ConstructorElement constructorElement = node.element; |
| Scope outerScope = _nameScope; |
| try { |
| if (constructorElement == null) { |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("Missing element for constructor "); |
| buffer.write(node.returnType.name); |
| if (node.name != null) { |
| buffer.write("."); |
| buffer.write(node.name.name); |
| } |
| buffer.write(" in "); |
| buffer.write(definingLibrary.source.fullName); |
| AnalysisEngine.instance.logger.logInformation( |
| buffer.toString(), |
| new CaughtException(new AnalysisException(), null)); |
| } else { |
| _nameScope = new FunctionScope(_nameScope, constructorElement); |
| } |
| super.visitConstructorDeclaration(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitDeclaredIdentifier(DeclaredIdentifier node) { |
| VariableElement element = node.element; |
| if (element != null) { |
| _nameScope.define(element); |
| } |
| super.visitDeclaredIdentifier(node); |
| return null; |
| } |
| |
| @override |
| Object visitDoStatement(DoStatement node) { |
| ImplicitLabelScope outerImplicitScope = _implicitLabelScope; |
| try { |
| _implicitLabelScope = _implicitLabelScope.nest(node); |
| visitStatementInScope(node.body); |
| safelyVisit(node.condition); |
| } finally { |
| _implicitLabelScope = outerImplicitScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitForEachStatement(ForEachStatement node) { |
| Scope outerNameScope = _nameScope; |
| ImplicitLabelScope outerImplicitScope = _implicitLabelScope; |
| try { |
| _nameScope = new EnclosedScope(_nameScope); |
| _implicitLabelScope = _implicitLabelScope.nest(node); |
| visitForEachStatementInScope(node); |
| } finally { |
| _nameScope = outerNameScope; |
| _implicitLabelScope = outerImplicitScope; |
| } |
| return null; |
| } |
| |
| /** |
| * Visit the given statement after it's scope has been created. This replaces the normal call to |
| * the inherited visit method so that ResolverVisitor can intervene when type propagation is |
| * enabled. |
| * |
| * @param node the statement to be visited |
| */ |
| void visitForEachStatementInScope(ForEachStatement node) { |
| // |
| // We visit the iterator before the loop variable because the loop variable |
| // cannot be in scope while visiting the iterator. |
| // |
| safelyVisit(node.identifier); |
| safelyVisit(node.iterable); |
| safelyVisit(node.loopVariable); |
| visitStatementInScope(node.body); |
| } |
| |
| @override |
| Object visitFormalParameterList(FormalParameterList node) { |
| super.visitFormalParameterList(node); |
| // We finished resolving function signature, now include formal parameters |
| // scope. |
| if (_nameScope is FunctionScope) { |
| (_nameScope as FunctionScope).defineParameters(); |
| } |
| if (_nameScope is FunctionTypeScope) { |
| (_nameScope as FunctionTypeScope).defineParameters(); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitForStatement(ForStatement node) { |
| Scope outerNameScope = _nameScope; |
| ImplicitLabelScope outerImplicitScope = _implicitLabelScope; |
| try { |
| _nameScope = new EnclosedScope(_nameScope); |
| _implicitLabelScope = _implicitLabelScope.nest(node); |
| visitForStatementInScope(node); |
| } finally { |
| _nameScope = outerNameScope; |
| _implicitLabelScope = outerImplicitScope; |
| } |
| return null; |
| } |
| |
| /** |
| * Visit the given statement after it's scope has been created. This replaces the normal call to |
| * the inherited visit method so that ResolverVisitor can intervene when type propagation is |
| * enabled. |
| * |
| * @param node the statement to be visited |
| */ |
| void visitForStatementInScope(ForStatement node) { |
| safelyVisit(node.variables); |
| safelyVisit(node.initialization); |
| safelyVisit(node.condition); |
| node.updaters.accept(this); |
| visitStatementInScope(node.body); |
| } |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) { |
| ExecutableElement functionElement = node.element; |
| if (functionElement != null && |
| functionElement.enclosingElement is! CompilationUnitElement) { |
| _nameScope.define(functionElement); |
| } |
| Scope outerScope = _nameScope; |
| try { |
| if (functionElement == null) { |
| AnalysisEngine.instance.logger.logInformation( |
| "Missing element for top-level function ${node.name.name} in ${definingLibrary.source.fullName}", |
| new CaughtException(new AnalysisException(), null)); |
| } else { |
| _nameScope = new FunctionScope(_nameScope, functionElement); |
| } |
| super.visitFunctionDeclaration(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFunctionExpression(FunctionExpression node) { |
| if (node.parent is FunctionDeclaration) { |
| // We have already created a function scope and don't need to do so again. |
| super.visitFunctionExpression(node); |
| } else { |
| Scope outerScope = _nameScope; |
| try { |
| ExecutableElement functionElement = node.element; |
| if (functionElement == null) { |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("Missing element for function "); |
| AstNode parent = node.parent; |
| while (parent != null) { |
| if (parent is Declaration) { |
| Element parentElement = (parent as Declaration).element; |
| buffer.write( |
| parentElement == null ? "<unknown> " : "${parentElement.name} "); |
| } |
| parent = parent.parent; |
| } |
| buffer.write("in "); |
| buffer.write(definingLibrary.source.fullName); |
| AnalysisEngine.instance.logger.logInformation( |
| buffer.toString(), |
| new CaughtException(new AnalysisException(), null)); |
| } else { |
| _nameScope = new FunctionScope(_nameScope, functionElement); |
| } |
| super.visitFunctionExpression(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFunctionTypeAlias(FunctionTypeAlias node) { |
| Scope outerScope = _nameScope; |
| try { |
| _nameScope = new FunctionTypeScope(_nameScope, node.element); |
| super.visitFunctionTypeAlias(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitIfStatement(IfStatement node) { |
| safelyVisit(node.condition); |
| visitStatementInScope(node.thenStatement); |
| visitStatementInScope(node.elseStatement); |
| return null; |
| } |
| |
| @override |
| Object visitLabeledStatement(LabeledStatement node) { |
| LabelScope outerScope = _addScopesFor(node.labels, node.unlabeled); |
| try { |
| super.visitLabeledStatement(node); |
| } finally { |
| _labelScope = outerScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| Scope outerScope = _nameScope; |
| try { |
| ExecutableElement methodElement = node.element; |
| if (methodElement == null) { |
| AnalysisEngine.instance.logger.logInformation( |
| "Missing element for method ${node.name.name} in ${definingLibrary.source.fullName}", |
| new CaughtException(new AnalysisException(), null)); |
| } else { |
| _nameScope = new FunctionScope(_nameScope, methodElement); |
| } |
| super.visitMethodDeclaration(node); |
| } finally { |
| _nameScope = outerScope; |
| } |
| return null; |
| } |
| |
| /** |
| * Visit the given statement after it's scope has been created. This is used by ResolverVisitor to |
| * correctly visit the 'then' and 'else' statements of an 'if' statement. |
| * |
| * @param node the statement to be visited |
| */ |
| void visitStatementInScope(Statement node) { |
| if (node is Block) { |
| // Don't create a scope around a block because the block will create it's |
| // own scope. |
| visitBlock(node); |
| } else if (node != null) { |
| Scope outerNameScope = _nameScope; |
| try { |
| _nameScope = new EnclosedScope(_nameScope); |
| node.accept(this); |
| } finally { |
| _nameScope = outerNameScope; |
| } |
| } |
| } |
| |
| @override |
| Object visitSwitchCase(SwitchCase node) { |
| node.expression.accept(this); |
| Scope outerNameScope = _nameScope; |
| try { |
| _nameScope = new EnclosedScope(_nameScope); |
| node.statements.accept(this); |
| } finally { |
| _nameScope = outerNameScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitSwitchDefault(SwitchDefault node) { |
| Scope outerNameScope = _nameScope; |
| try { |
| _nameScope = new EnclosedScope(_nameScope); |
| node.statements.accept(this); |
| } finally { |
| _nameScope = outerNameScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitSwitchStatement(SwitchStatement node) { |
| LabelScope outerScope = _labelScope; |
| ImplicitLabelScope outerImplicitScope = _implicitLabelScope; |
| try { |
| _implicitLabelScope = _implicitLabelScope.nest(node); |
| for (SwitchMember member in node.members) { |
| for (Label label in member.labels) { |
| SimpleIdentifier labelName = label.label; |
| LabelElement labelElement = labelName.staticElement as LabelElement; |
| _labelScope = |
| new LabelScope(_labelScope, labelName.name, member, labelElement); |
| } |
| } |
| super.visitSwitchStatement(node); |
| } finally { |
| _labelScope = outerScope; |
| _implicitLabelScope = outerImplicitScope; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitVariableDeclaration(VariableDeclaration node) { |
| super.visitVariableDeclaration(node); |
| if (node.parent.parent is! TopLevelVariableDeclaration && |
| node.parent.parent is! FieldDeclaration) { |
| VariableElement element = node.element; |
| if (element != null) { |
| _nameScope.define(element); |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitWhileStatement(WhileStatement node) { |
| safelyVisit(node.condition); |
| ImplicitLabelScope outerImplicitScope = _implicitLabelScope; |
| try { |
| _implicitLabelScope = _implicitLabelScope.nest(node); |
| visitStatementInScope(node.body); |
| } finally { |
| _implicitLabelScope = outerImplicitScope; |
| } |
| return null; |
| } |
| |
| /** |
| * Add scopes for each of the given labels. |
| * |
| * @param labels the labels for which new scopes are to be added |
| * @return the scope that was in effect before the new scopes were added |
| */ |
| LabelScope _addScopesFor(NodeList<Label> labels, AstNode node) { |
| LabelScope outerScope = _labelScope; |
| for (Label label in labels) { |
| SimpleIdentifier labelNameNode = label.label; |
| String labelName = labelNameNode.name; |
| LabelElement labelElement = labelNameNode.staticElement as LabelElement; |
| _labelScope = new LabelScope(_labelScope, labelName, node, labelElement); |
| } |
| return outerScope; |
| } |
| |
| /** |
| * Marks the local declarations of the given [Block] hidden in the enclosing scope. |
| * According to the scoping rules name is hidden if block defines it, but name is defined after |
| * its declaration statement. |
| */ |
| void _hideNamesDefinedInBlock(EnclosedScope scope, Block block) { |
| NodeList<Statement> statements = block.statements; |
| int statementCount = statements.length; |
| for (int i = 0; i < statementCount; i++) { |
| Statement statement = statements[i]; |
| if (statement is VariableDeclarationStatement) { |
| VariableDeclarationStatement vds = statement; |
| NodeList<VariableDeclaration> variables = vds.variables.variables; |
| int variableCount = variables.length; |
| for (int j = 0; j < variableCount; j++) { |
| scope.hide(variables[j].element); |
| } |
| } else if (statement is FunctionDeclarationStatement) { |
| FunctionDeclarationStatement fds = statement; |
| scope.hide(fds.functionDeclaration.element); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Instances of this class manage the knowledge of what the set of subtypes are for a given type. |
| */ |
| class SubtypeManager { |
| /** |
| * A map between [ClassElement]s and a set of [ClassElement]s that are subtypes of the |
| * key. |
| */ |
| HashMap<ClassElement, HashSet<ClassElement>> _subtypeMap = |
| new HashMap<ClassElement, HashSet<ClassElement>>(); |
| |
| /** |
| * The set of all [LibraryElement]s that have been visited by the manager. This is used both |
| * to prevent infinite loops in the recursive methods, and also as a marker for the scope of the |
| * libraries visited by this manager. |
| */ |
| HashSet<LibraryElement> _visitedLibraries = new HashSet<LibraryElement>(); |
| |
| /** |
| * Given some [ClassElement], return the set of all subtypes, and subtypes of subtypes. |
| * |
| * @param classElement the class to recursively return the set of subtypes of |
| */ |
| HashSet<ClassElement> computeAllSubtypes(ClassElement classElement) { |
| // Ensure that we have generated the subtype map for the library |
| _computeSubtypesInLibrary(classElement.library); |
| // use the subtypeMap to compute the set of all subtypes and subtype's |
| // subtypes |
| HashSet<ClassElement> allSubtypes = new HashSet<ClassElement>(); |
| _safelyComputeAllSubtypes( |
| classElement, |
| new HashSet<ClassElement>(), |
| allSubtypes); |
| return allSubtypes; |
| } |
| |
| /** |
| * Given some [LibraryElement], visit all of the types in the library, the passed library, |
| * and any imported libraries, will be in the [visitedLibraries] set. |
| * |
| * @param libraryElement the library to visit, it it hasn't been visited already |
| */ |
| void ensureLibraryVisited(LibraryElement libraryElement) { |
| _computeSubtypesInLibrary(libraryElement); |
| } |
| |
| /** |
| * Given some [ClassElement], this method adds all of the pairs combinations of itself and |
| * all of its supertypes to the [subtypeMap] map. |
| * |
| * @param classElement the class element |
| */ |
| void _computeSubtypesInClass(ClassElement classElement) { |
| InterfaceType supertypeType = classElement.supertype; |
| if (supertypeType != null) { |
| ClassElement supertypeElement = supertypeType.element; |
| if (supertypeElement != null) { |
| _putInSubtypeMap(supertypeElement, classElement); |
| } |
| } |
| List<InterfaceType> interfaceTypes = classElement.interfaces; |
| for (InterfaceType interfaceType in interfaceTypes) { |
| ClassElement interfaceElement = interfaceType.element; |
| if (interfaceElement != null) { |
| _putInSubtypeMap(interfaceElement, classElement); |
| } |
| } |
| List<InterfaceType> mixinTypes = classElement.mixins; |
| for (InterfaceType mixinType in mixinTypes) { |
| ClassElement mixinElement = mixinType.element; |
| if (mixinElement != null) { |
| _putInSubtypeMap(mixinElement, classElement); |
| } |
| } |
| } |
| |
| /** |
| * Given some [CompilationUnitElement], this method calls |
| * [computeAllSubtypes] on all of the [ClassElement]s in the |
| * compilation unit. |
| * |
| * @param unitElement the compilation unit element |
| */ |
| void _computeSubtypesInCompilationUnit(CompilationUnitElement unitElement) { |
| List<ClassElement> classElements = unitElement.types; |
| for (ClassElement classElement in classElements) { |
| _computeSubtypesInClass(classElement); |
| } |
| } |
| |
| /** |
| * Given some [LibraryElement], this method calls |
| * [computeAllSubtypes] on all of the [ClassElement]s in the |
| * compilation unit, and itself for all imported and exported libraries. All visited libraries are |
| * added to the [visitedLibraries] set. |
| * |
| * @param libraryElement the library element |
| */ |
| void _computeSubtypesInLibrary(LibraryElement libraryElement) { |
| if (libraryElement == null || _visitedLibraries.contains(libraryElement)) { |
| return; |
| } |
| _visitedLibraries.add(libraryElement); |
| _computeSubtypesInCompilationUnit(libraryElement.definingCompilationUnit); |
| List<CompilationUnitElement> parts = libraryElement.parts; |
| for (CompilationUnitElement part in parts) { |
| _computeSubtypesInCompilationUnit(part); |
| } |
| List<LibraryElement> imports = libraryElement.importedLibraries; |
| for (LibraryElement importElt in imports) { |
| _computeSubtypesInLibrary(importElt.library); |
| } |
| List<LibraryElement> exports = libraryElement.exportedLibraries; |
| for (LibraryElement exportElt in exports) { |
| _computeSubtypesInLibrary(exportElt.library); |
| } |
| } |
| |
| /** |
| * Add some key/ value pair into the [subtypeMap] map. |
| * |
| * @param supertypeElement the key for the [subtypeMap] map |
| * @param subtypeElement the value for the [subtypeMap] map |
| */ |
| void _putInSubtypeMap(ClassElement supertypeElement, |
| ClassElement subtypeElement) { |
| HashSet<ClassElement> subtypes = _subtypeMap[supertypeElement]; |
| if (subtypes == null) { |
| subtypes = new HashSet<ClassElement>(); |
| _subtypeMap[supertypeElement] = subtypes; |
| } |
| subtypes.add(subtypeElement); |
| } |
| |
| /** |
| * Given some [ClassElement] and a [HashSet<ClassElement>], this method recursively |
| * adds all of the subtypes of the [ClassElement] to the passed array. |
| * |
| * @param classElement the type to compute the set of subtypes of |
| * @param visitedClasses the set of class elements that this method has already recursively seen |
| * @param allSubtypes the computed set of subtypes of the passed class element |
| */ |
| void _safelyComputeAllSubtypes(ClassElement classElement, |
| HashSet<ClassElement> visitedClasses, HashSet<ClassElement> allSubtypes) { |
| if (!visitedClasses.add(classElement)) { |
| // if this class has already been called on this class element |
| return; |
| } |
| HashSet<ClassElement> subtypes = _subtypeMap[classElement]; |
| if (subtypes == null) { |
| return; |
| } |
| for (ClassElement subtype in subtypes) { |
| _safelyComputeAllSubtypes(subtype, visitedClasses, allSubtypes); |
| } |
| allSubtypes.addAll(subtypes); |
| } |
| } |
| |
| /** |
| * Instances of the class `ToDoFinder` find to-do comments in Dart code. |
| */ |
| class ToDoFinder { |
| /** |
| * The error reporter by which to-do comments will be reported. |
| */ |
| final ErrorReporter _errorReporter; |
| |
| /** |
| * Initialize a newly created to-do finder to report to-do comments to the given reporter. |
| * |
| * @param errorReporter the error reporter by which to-do comments will be reported |
| */ |
| ToDoFinder(this._errorReporter); |
| |
| /** |
| * Search the comments in the given compilation unit for to-do comments and report an error for |
| * each. |
| * |
| * @param unit the compilation unit containing the to-do comments |
| */ |
| void findIn(CompilationUnit unit) { |
| _gatherTodoComments(unit.beginToken); |
| } |
| |
| /** |
| * Search the comment tokens reachable from the given token and create errors for each to-do |
| * comment. |
| * |
| * @param token the head of the list of tokens being searched |
| */ |
| void _gatherTodoComments(sc.Token token) { |
| while (token != null && token.type != sc.TokenType.EOF) { |
| sc.Token commentToken = token.precedingComments; |
| while (commentToken != null) { |
| if (commentToken.type == sc.TokenType.SINGLE_LINE_COMMENT || |
| commentToken.type == sc.TokenType.MULTI_LINE_COMMENT) { |
| _scrapeTodoComment(commentToken); |
| } |
| commentToken = commentToken.next; |
| } |
| token = token.next; |
| } |
| } |
| |
| /** |
| * Look for user defined tasks in comments and convert them into info level analysis issues. |
| * |
| * @param commentToken the comment token to analyze |
| */ |
| void _scrapeTodoComment(sc.Token commentToken) { |
| JavaPatternMatcher matcher = |
| new JavaPatternMatcher(TodoCode.TODO_REGEX, commentToken.lexeme); |
| if (matcher.find()) { |
| int offset = |
| commentToken.offset + |
| matcher.start() + |
| matcher.group(1).length; |
| int length = matcher.group(2).length; |
| _errorReporter.reportErrorForOffset( |
| TodoCode.TODO, |
| offset, |
| length, |
| [matcher.group(2)]); |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `TypeOverrideManager` manage the ability to override the type of an |
| * element within a given context. |
| */ |
| class TypeOverrideManager { |
| /** |
| * The current override scope, or `null` if no scope has been entered. |
| */ |
| TypeOverrideManager_TypeOverrideScope _currentScope; |
| |
| /** |
| * Apply a set of overrides that were previously captured. |
| * |
| * @param overrides the overrides to be applied |
| */ |
| void applyOverrides(Map<VariableElement, DartType> overrides) { |
| if (_currentScope == null) { |
| throw new IllegalStateException("Cannot apply overrides without a scope"); |
| } |
| _currentScope.applyOverrides(overrides); |
| } |
| |
| /** |
| * Return a table mapping the elements whose type is overridden in the current scope to the |
| * overriding type. |
| * |
| * @return the overrides in the current scope |
| */ |
| Map<VariableElement, DartType> captureLocalOverrides() { |
| if (_currentScope == null) { |
| throw new IllegalStateException( |
| "Cannot capture local overrides without a scope"); |
| } |
| return _currentScope.captureLocalOverrides(); |
| } |
| |
| /** |
| * Return a map from the elements for the variables in the given list that have their types |
| * overridden to the overriding type. |
| * |
| * @param variableList the list of variables whose overriding types are to be captured |
| * @return a table mapping elements to their overriding types |
| */ |
| Map<VariableElement, DartType> |
| captureOverrides(VariableDeclarationList variableList) { |
| if (_currentScope == null) { |
| throw new IllegalStateException( |
| "Cannot capture overrides without a scope"); |
| } |
| return _currentScope.captureOverrides(variableList); |
| } |
| |
| /** |
| * Enter a new override scope. |
| */ |
| void enterScope() { |
| _currentScope = new TypeOverrideManager_TypeOverrideScope(_currentScope); |
| } |
| |
| /** |
| * Exit the current override scope. |
| */ |
| void exitScope() { |
| if (_currentScope == null) { |
| throw new IllegalStateException("No scope to exit"); |
| } |
| _currentScope = _currentScope._outerScope; |
| } |
| |
| /** |
| * Return the best type information available for the given element. If the type of the element |
| * has been overridden, then return the overriding type. Otherwise, return the static type. |
| * |
| * @param element the element for which type information is to be returned |
| * @return the best type information available for the given element |
| */ |
| DartType getBestType(VariableElement element) { |
| DartType bestType = getType(element); |
| return bestType == null ? element.type : bestType; |
| } |
| |
| /** |
| * Return the overridden type of the given element, or `null` if the type of the element has |
| * not been overridden. |
| * |
| * @param element the element whose type might have been overridden |
| * @return the overridden type of the given element |
| */ |
| DartType getType(Element element) { |
| if (_currentScope == null) { |
| return null; |
| } |
| return _currentScope.getType(element); |
| } |
| |
| /** |
| * Update overrides assuming `perBranchOverrides` is the collection of per-branch overrides |
| * for *all* branches flowing into a join point. If a variable is updated in each per-branch |
| * override, then its type before the branching is ignored. Otherwise, its type before the |
| * branching is merged with all updates in the branches. |
| * |
| * Although this method would do the right thing for a single set of overrides, we require there |
| * to be at least two override sets. Instead use `applyOverrides` for to apply a single set. |
| * |
| * For example, for the code |
| * |
| * <pre> |
| * if (c) { |
| * ... |
| * } else { |
| * ... |
| * } |
| * </pre> |
| * the `perBranchOverrides` would include overrides for the then and else branches, and for |
| * the code |
| * |
| * <pre> |
| * ... |
| * while(c) { |
| * ... |
| * } |
| * </pre> |
| * the `perBranchOverrides` would include overrides for before the loop and for the loop |
| * body. |
| * |
| * @param perBranchOverrides one set of overrides for each (at least two) branch flowing into the |
| * join point |
| */ |
| void joinOverrides(List<Map<VariableElement, DartType>> perBranchOverrides) { |
| if (perBranchOverrides.length < 2) { |
| throw new IllegalArgumentException( |
| "There is no point in joining zero or one override sets."); |
| } |
| Set<VariableElement> allElements = new HashSet<VariableElement>(); |
| Set<VariableElement> commonElements = |
| new HashSet<VariableElement>.from(perBranchOverrides[0].keys.toSet()); |
| for (Map<VariableElement, DartType> os in perBranchOverrides) { |
| // Union: elements updated in some branch. |
| allElements.addAll(os.keys.toSet()); |
| // Intersection: elements updated in all branches. |
| commonElements.retainAll(os.keys.toSet()); |
| } |
| Set<VariableElement> uncommonElements = allElements; |
| // Difference: elements updated in some but not all branches. |
| uncommonElements.removeAll(commonElements); |
| Map<VariableElement, DartType> joinOverrides = |
| new HashMap<VariableElement, DartType>(); |
| // The common elements were updated in all branches, so their type |
| // before branching can be ignored. |
| for (VariableElement e in commonElements) { |
| joinOverrides[e] = perBranchOverrides[0][e]; |
| for (Map<VariableElement, DartType> os in perBranchOverrides) { |
| joinOverrides[e] = UnionTypeImpl.union([joinOverrides[e], os[e]]); |
| } |
| } |
| // The uncommon elements were updated in some but not all branches, |
| // so they may still have the type they had before branching. |
| for (VariableElement e in uncommonElements) { |
| joinOverrides[e] = getBestType(e); |
| for (Map<VariableElement, DartType> os in perBranchOverrides) { |
| if (os.containsKey(e)) { |
| joinOverrides[e] = UnionTypeImpl.union([joinOverrides[e], os[e]]); |
| } |
| } |
| } |
| applyOverrides(joinOverrides); |
| } |
| |
| /** |
| * Set the overridden type of the given element to the given type |
| * |
| * @param element the element whose type might have been overridden |
| * @param type the overridden type of the given element |
| */ |
| void setType(VariableElement element, DartType type) { |
| if (_currentScope == null) { |
| throw new IllegalStateException("Cannot override without a scope"); |
| } |
| _currentScope.setType(element, type); |
| } |
| } |
| |
| /** |
| * Instances of the class `TypeOverrideScope` represent a scope in which the types of |
| * elements can be overridden. |
| */ |
| class TypeOverrideManager_TypeOverrideScope { |
| /** |
| * The outer scope in which types might be overridden. |
| */ |
| final TypeOverrideManager_TypeOverrideScope _outerScope; |
| |
| /** |
| * A table mapping elements to the overridden type of that element. |
| */ |
| Map<VariableElement, DartType> _overridenTypes = |
| new HashMap<VariableElement, DartType>(); |
| |
| /** |
| * Initialize a newly created scope to be an empty child of the given scope. |
| * |
| * @param outerScope the outer scope in which types might be overridden |
| */ |
| TypeOverrideManager_TypeOverrideScope(this._outerScope); |
| |
| /** |
| * Apply a set of overrides that were previously captured. |
| * |
| * @param overrides the overrides to be applied |
| */ |
| void applyOverrides(Map<VariableElement, DartType> overrides) { |
| overrides.forEach((VariableElement element, DartType type) { |
| _overridenTypes[element] = type; |
| }); |
| } |
| |
| /** |
| * Return a table mapping the elements whose type is overridden in the current scope to the |
| * overriding type. |
| * |
| * @return the overrides in the current scope |
| */ |
| Map<VariableElement, DartType> captureLocalOverrides() => _overridenTypes; |
| |
| /** |
| * Return a map from the elements for the variables in the given list that have their types |
| * overridden to the overriding type. |
| * |
| * @param variableList the list of variables whose overriding types are to be captured |
| * @return a table mapping elements to their overriding types |
| */ |
| Map<VariableElement, DartType> |
| captureOverrides(VariableDeclarationList variableList) { |
| Map<VariableElement, DartType> overrides = |
| new HashMap<VariableElement, DartType>(); |
| if (variableList.isConst || variableList.isFinal) { |
| for (VariableDeclaration variable in variableList.variables) { |
| VariableElement element = variable.element; |
| if (element != null) { |
| DartType type = _overridenTypes[element]; |
| if (type != null) { |
| overrides[element] = type; |
| } |
| } |
| } |
| } |
| return overrides; |
| } |
| |
| /** |
| * Return the overridden type of the given element, or `null` if the type of the element |
| * has not been overridden. |
| * |
| * @param element the element whose type might have been overridden |
| * @return the overridden type of the given element |
| */ |
| DartType getType(Element element) { |
| DartType type = _overridenTypes[element]; |
| if (type == null && element is PropertyAccessorElement) { |
| type = _overridenTypes[element.variable]; |
| } |
| if (type != null) { |
| return type; |
| } else if (_outerScope != null) { |
| return _outerScope.getType(element); |
| } |
| return null; |
| } |
| |
| /** |
| * Set the overridden type of the given element to the given type |
| * |
| * @param element the element whose type might have been overridden |
| * @param type the overridden type of the given element |
| */ |
| void setType(VariableElement element, DartType type) { |
| _overridenTypes[element] = type; |
| } |
| } |
| |
| /** |
| * Instances of the class `TypeParameterScope` implement the scope defined by the type |
| * parameters in a class. |
| */ |
| class TypeParameterScope extends EnclosedScope { |
| /** |
| * Initialize a newly created scope enclosed within another scope. |
| * |
| * @param enclosingScope the scope in which this scope is lexically enclosed |
| * @param typeElement the element representing the type represented by this scope |
| */ |
| TypeParameterScope(Scope enclosingScope, ClassElement typeElement) |
| : super(enclosingScope) { |
| if (typeElement == null) { |
| throw new IllegalArgumentException("class element cannot be null"); |
| } |
| _defineTypeParameters(typeElement); |
| } |
| |
| /** |
| * Define the type parameters for the class. |
| * |
| * @param typeElement the element representing the type represented by this scope |
| */ |
| void _defineTypeParameters(ClassElement typeElement) { |
| for (TypeParameterElement typeParameter in typeElement.typeParameters) { |
| define(typeParameter); |
| } |
| } |
| } |
| |
| /** |
| * Instances of the class `TypePromotionManager` manage the ability to promote types of local |
| * variables and formal parameters from their declared types based on control flow. |
| */ |
| class TypePromotionManager { |
| /** |
| * The current promotion scope, or `null` if no scope has been entered. |
| */ |
| TypePromotionManager_TypePromoteScope _currentScope; |
| |
| /** |
| * Returns the elements with promoted types. |
| */ |
| Iterable<Element> get promotedElements => _currentScope.promotedElements; |
| |
| /** |
| * Enter a new promotions scope. |
| */ |
| void enterScope() { |
| _currentScope = new TypePromotionManager_TypePromoteScope(_currentScope); |
| } |
| |
| /** |
| * Exit the current promotion scope. |
| */ |
| void exitScope() { |
| if (_currentScope == null) { |
| throw new IllegalStateException("No scope to exit"); |
| } |
| _currentScope = _currentScope._outerScope; |
| } |
| |
| /** |
| * Returns static type of the given variable - declared or promoted. |
| * |
| * @return the static type of the given variable - declared or promoted |
| */ |
| DartType getStaticType(VariableElement variable) { |
| DartType staticType = getType(variable); |
| if (staticType == null) { |
| staticType = variable.type; |
| } |
| return staticType; |
| } |
| |
| /** |
| * Return the promoted type of the given element, or `null` if the type of the element has |
| * not been promoted. |
| * |
| * @param element the element whose type might have been promoted |
| * @return the promoted type of the given element |
| */ |
| DartType getType(Element element) { |
| if (_currentScope == null) { |
| return null; |
| } |
| return _currentScope.getType(element); |
| } |
| |
| /** |
| * Set the promoted type of the given element to the given type. |
| * |
| * @param element the element whose type might have been promoted |
| * @param type the promoted type of the given element |
| */ |
| void setType(Element element, DartType type) { |
| if (_currentScope == null) { |
| throw new IllegalStateException("Cannot promote without a scope"); |
| } |
| _currentScope.setType(element, type); |
| } |
| } |
| |
| /** |
| * Instances of the class `TypePromoteScope` represent a scope in which the types of |
| * elements can be promoted. |
| */ |
| class TypePromotionManager_TypePromoteScope { |
| /** |
| * The outer scope in which types might be promoter. |
| */ |
| final TypePromotionManager_TypePromoteScope _outerScope; |
| |
| /** |
| * A table mapping elements to the promoted type of that element. |
| */ |
| HashMap<Element, DartType> _promotedTypes = new HashMap<Element, DartType>(); |
| |
| /** |
| * Initialize a newly created scope to be an empty child of the given scope. |
| * |
| * @param outerScope the outer scope in which types might be promoted |
| */ |
| TypePromotionManager_TypePromoteScope(this._outerScope); |
| |
| /** |
| * Returns the elements with promoted types. |
| */ |
| Iterable<Element> get promotedElements => _promotedTypes.keys.toSet(); |
| |
| /** |
| * Return the promoted type of the given element, or `null` if the type of the element has |
| * not been promoted. |
| * |
| * @param element the element whose type might have been promoted |
| * @return the promoted type of the given element |
| */ |
| DartType getType(Element element) { |
| DartType type = _promotedTypes[element]; |
| if (type == null && element is PropertyAccessorElement) { |
| type = _promotedTypes[element.variable]; |
| } |
| if (type != null) { |
| return type; |
| } else if (_outerScope != null) { |
| return _outerScope.getType(element); |
| } |
| return null; |
| } |
| |
| /** |
| * Set the promoted type of the given element to the given type. |
| * |
| * @param element the element whose type might have been promoted |
| * @param type the promoted type of the given element |
| */ |
| void setType(Element element, DartType type) { |
| _promotedTypes[element] = type; |
| } |
| } |
| |
| /** |
| * The interface `TypeProvider` defines the behavior of objects that provide access to types |
| * defined by the language. |
| */ |
| abstract class TypeProvider { |
| /** |
| * Return the type representing the built-in type 'bool'. |
| * |
| * @return the type representing the built-in type 'bool' |
| */ |
| InterfaceType get boolType; |
| |
| /** |
| * Return the type representing the type 'bottom'. |
| * |
| * @return the type representing the type 'bottom' |
| */ |
| DartType get bottomType; |
| |
| /** |
| * Return the type representing the built-in type 'Deprecated'. |
| * |
| * @return the type representing the built-in type 'Deprecated' |
| */ |
| InterfaceType get deprecatedType; |
| |
| /** |
| * Return the type representing the built-in type 'double'. |
| * |
| * @return the type representing the built-in type 'double' |
| */ |
| InterfaceType get doubleType; |
| |
| /** |
| * Return the type representing the built-in type 'dynamic'. |
| * |
| * @return the type representing the built-in type 'dynamic' |
| */ |
| DartType get dynamicType; |
| |
| /** |
| * Return the type representing the built-in type 'Function'. |
| * |
| * @return the type representing the built-in type 'Function' |
| */ |
| InterfaceType get functionType; |
| |
| /** |
| * Return the type representing the built-in type 'int'. |
| * |
| * @return the type representing the built-in type 'int' |
| */ |
| InterfaceType get intType; |
| |
| /** |
| * Return the type representing the built-in type 'List'. |
| * |
| * @return the type representing the built-in type 'List' |
| */ |
| InterfaceType get listType; |
| |
| /** |
| * Return the type representing the built-in type 'Map'. |
| * |
| * @return the type representing the built-in type 'Map' |
| */ |
| InterfaceType get mapType; |
| |
| /** |
| * Return the type representing the built-in type 'Null'. |
| * |
| * @return the type representing the built-in type 'null' |
| */ |
| InterfaceType get nullType; |
| |
| /** |
| * Return the type representing the built-in type 'num'. |
| * |
| * @return the type representing the built-in type 'num' |
| */ |
| InterfaceType get numType; |
| |
| /** |
| * Return the type representing the built-in type 'Object'. |
| * |
| * @return the type representing the built-in type 'Object' |
| */ |
| InterfaceType get objectType; |
| |
| /** |
| * Return the type representing the built-in type 'StackTrace'. |
| * |
| * @return the type representing the built-in type 'StackTrace' |
| */ |
| InterfaceType get stackTraceType; |
| |
| /** |
| * Return the type representing the built-in type 'String'. |
| * |
| * @return the type representing the built-in type 'String' |
| */ |
| InterfaceType get stringType; |
| |
| /** |
| * Return the type representing the built-in type 'Symbol'. |
| * |
| * @return the type representing the built-in type 'Symbol' |
| */ |
| InterfaceType get symbolType; |
| |
| /** |
| * Return the type representing the built-in type 'Type'. |
| * |
| * @return the type representing the built-in type 'Type' |
| */ |
| InterfaceType get typeType; |
| |
| /** |
| * Return the type representing typenames that can't be resolved. |
| */ |
| DartType get undefinedType; |
| } |
| |
| /** |
| * Instances of the class `TypeProviderImpl` provide access to types defined by the language |
| * by looking for those types in the element model for the core library. |
| */ |
| class TypeProviderImpl implements TypeProvider { |
| /** |
| * The type representing the built-in type 'bool'. |
| */ |
| InterfaceType _boolType; |
| |
| /** |
| * The type representing the type 'bottom'. |
| */ |
| DartType _bottomType; |
| |
| /** |
| * The type representing the built-in type 'double'. |
| */ |
| InterfaceType _doubleType; |
| |
| /** |
| * The type representing the built-in type 'Deprecated'. |
| */ |
| InterfaceType _deprecatedType; |
| |
| /** |
| * The type representing the built-in type 'dynamic'. |
| */ |
| DartType _dynamicType; |
| |
| /** |
| * The type representing the built-in type 'Function'. |
| */ |
| InterfaceType _functionType; |
| |
| /** |
| * The type representing the built-in type 'int'. |
| */ |
| InterfaceType _intType; |
| |
| /** |
| * The type representing the built-in type 'List'. |
| */ |
| InterfaceType _listType; |
| |
| /** |
| * The type representing the built-in type 'Map'. |
| */ |
| InterfaceType _mapType; |
| |
| /** |
| * The type representing the type 'Null'. |
| */ |
| InterfaceType _nullType; |
| |
| /** |
| * The type representing the built-in type 'num'. |
| */ |
| InterfaceType _numType; |
| |
| /** |
| * The type representing the built-in type 'Object'. |
| */ |
| InterfaceType _objectType; |
| |
| /** |
| * The type representing the built-in type 'StackTrace'. |
| */ |
| InterfaceType _stackTraceType; |
| |
| /** |
| * The type representing the built-in type 'String'. |
| */ |
| InterfaceType _stringType; |
| |
| /** |
| * The type representing the built-in type 'Symbol'. |
| */ |
| InterfaceType _symbolType; |
| |
| /** |
| * The type representing the built-in type 'Type'. |
| */ |
| InterfaceType _typeType; |
| |
| /** |
| * The type representing typenames that can't be resolved. |
| */ |
| DartType _undefinedType; |
| |
| /** |
| * Initialize a newly created type provider to provide the types defined in the given library. |
| * |
| * @param coreLibrary the element representing the core library (dart:core). |
| */ |
| TypeProviderImpl(LibraryElement coreLibrary) { |
| _initializeFrom(coreLibrary); |
| } |
| |
| @override |
| InterfaceType get boolType => _boolType; |
| |
| @override |
| DartType get bottomType => _bottomType; |
| |
| @override |
| InterfaceType get deprecatedType => _deprecatedType; |
| |
| @override |
| InterfaceType get doubleType => _doubleType; |
| |
| @override |
| DartType get dynamicType => _dynamicType; |
| |
| @override |
| InterfaceType get functionType => _functionType; |
| |
| @override |
| InterfaceType get intType => _intType; |
| |
| @override |
| InterfaceType get listType => _listType; |
| |
| @override |
| InterfaceType get mapType => _mapType; |
| |
| @override |
| InterfaceType get nullType => _nullType; |
| |
| @override |
| InterfaceType get numType => _numType; |
| |
| @override |
| InterfaceType get objectType => _objectType; |
| |
| @override |
| InterfaceType get stackTraceType => _stackTraceType; |
| |
| @override |
| InterfaceType get stringType => _stringType; |
| |
| @override |
| InterfaceType get symbolType => _symbolType; |
| |
| @override |
| InterfaceType get typeType => _typeType; |
| |
| @override |
| DartType get undefinedType => _undefinedType; |
| |
| /** |
| * Return the type with the given name from the given namespace, or `null` if there is no |
| * class with the given name. |
| * |
| * @param namespace the namespace in which to search for the given name |
| * @param typeName the name of the type being searched for |
| * @return the type that was found |
| */ |
| InterfaceType _getType(Namespace namespace, String typeName) { |
| Element element = namespace.get(typeName); |
| if (element == null) { |
| AnalysisEngine.instance.logger.logInformation( |
| "No definition of type $typeName"); |
| return null; |
| } |
| return (element as ClassElement).type; |
| } |
| |
| /** |
| * Initialize the types provided by this type provider from the given library. |
| * |
| * @param library the library containing the definitions of the core types |
| */ |
| void _initializeFrom(LibraryElement library) { |
| Namespace namespace = |
| new NamespaceBuilder().createPublicNamespaceForLibrary(library); |
| _boolType = _getType(namespace, "bool"); |
| _bottomType = BottomTypeImpl.instance; |
| _deprecatedType = _getType(namespace, "Deprecated"); |
| _doubleType = _getType(namespace, "double"); |
| _dynamicType = DynamicTypeImpl.instance; |
| _functionType = _getType(namespace, "Function"); |
| _intType = _getType(namespace, "int"); |
| _listType = _getType(namespace, "List"); |
| _mapType = _getType(namespace, "Map"); |
| _nullType = _getType(namespace, "Null"); |
| _numType = _getType(namespace, "num"); |
| _objectType = _getType(namespace, "Object"); |
| _stackTraceType = _getType(namespace, "StackTrace"); |
| _stringType = _getType(namespace, "String"); |
| _symbolType = _getType(namespace, "Symbol"); |
| _typeType = _getType(namespace, "Type"); |
| _undefinedType = UndefinedTypeImpl.instance; |
| } |
| } |
| |
| /** |
| * Instances of the class `TypeResolverVisitor` are used to resolve the types associated with |
| * the elements in the element model. This includes the types of superclasses, mixins, interfaces, |
| * fields, methods, parameters, and local variables. As a side-effect, this also finishes building |
| * the type hierarchy. |
| */ |
| class TypeResolverVisitor extends ScopedVisitor { |
| /** |
| * The type representing the type 'dynamic'. |
| */ |
| DartType _dynamicType; |
| |
| /** |
| * The type representing typenames that can't be resolved. |
| */ |
| DartType _undefinedType; |
| |
| /** |
| * The flag specifying if currently visited class references 'super' expression. |
| */ |
| bool _hasReferenceToSuper = false; |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| TypeResolverVisitor.con1(Library library, Source source, |
| TypeProvider typeProvider) |
| : super.con1(library, source, typeProvider) { |
| _dynamicType = typeProvider.dynamicType; |
| _undefinedType = typeProvider.undefinedType; |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param definingLibrary the element for the library containing the compilation unit being |
| * visited |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| * @param errorListener the error listener that will be informed of any errors that are found |
| * during resolution |
| */ |
| TypeResolverVisitor.con2(LibraryElement definingLibrary, Source source, |
| TypeProvider typeProvider, AnalysisErrorListener errorListener) |
| : super.con2(definingLibrary, source, typeProvider, errorListener) { |
| _dynamicType = typeProvider.dynamicType; |
| _undefinedType = typeProvider.undefinedType; |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in an AST node. |
| * |
| * @param definingLibrary the element for the library containing the node being visited |
| * @param source the source representing the compilation unit containing the node being visited |
| * @param typeProvider the object used to access the types from the core library |
| * @param nameScope the scope used to resolve identifiers in the node that will first be visited |
| * @param errorListener the error listener that will be informed of any errors that are found |
| * during resolution |
| */ |
| TypeResolverVisitor.con3(LibraryElement definingLibrary, Source source, |
| TypeProvider typeProvider, Scope nameScope, AnalysisErrorListener errorListener) |
| : super.con3( |
| definingLibrary, |
| source, |
| typeProvider, |
| nameScope, |
| errorListener) { |
| _dynamicType = typeProvider.dynamicType; |
| _undefinedType = typeProvider.undefinedType; |
| } |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| TypeResolverVisitor.con4(ResolvableLibrary library, Source source, |
| TypeProvider typeProvider) |
| : super.con4(library, source, typeProvider) { |
| _dynamicType = typeProvider.dynamicType; |
| _undefinedType = typeProvider.undefinedType; |
| } |
| |
| @override |
| Object visitAnnotation(Annotation node) { |
| // |
| // Visit annotations, if the annotation is @proxy, on a class, and "proxy" |
| // resolves to the proxy annotation in dart.core, then create create the |
| // ElementAnnotationImpl and set it as the metadata on the enclosing class. |
| // |
| // Element resolution is done in the ElementResolver, and this work will be |
| // done in the general case for all annotations in the ElementResolver. |
| // The reason we resolve this particular element early is so that |
| // ClassElement.isProxy() returns the correct information during all |
| // phases of the ElementResolver. |
| // |
| super.visitAnnotation(node); |
| Identifier identifier = node.name; |
| if (identifier.name.endsWith(ElementAnnotationImpl.PROXY_VARIABLE_NAME) && |
| node.parent is ClassDeclaration) { |
| Element element = nameScope.lookup(identifier, definingLibrary); |
| if (element != null && |
| element.library.isDartCore && |
| element is PropertyAccessorElement) { |
| // This is the @proxy from dart.core |
| ClassDeclaration classDeclaration = node.parent as ClassDeclaration; |
| ElementAnnotationImpl elementAnnotation = |
| new ElementAnnotationImpl(element); |
| node.elementAnnotation = elementAnnotation; |
| (classDeclaration.element as ClassElementImpl).metadata = |
| <ElementAnnotationImpl>[elementAnnotation]; |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitCatchClause(CatchClause node) { |
| super.visitCatchClause(node); |
| SimpleIdentifier exception = node.exceptionParameter; |
| if (exception != null) { |
| // If an 'on' clause is provided the type of the exception parameter is |
| // the type in the 'on' clause. Otherwise, the type of the exception |
| // parameter is 'Object'. |
| TypeName exceptionTypeName = node.exceptionType; |
| DartType exceptionType; |
| if (exceptionTypeName == null) { |
| exceptionType = typeProvider.dynamicType; |
| } else { |
| exceptionType = _getType(exceptionTypeName); |
| } |
| _recordType(exception, exceptionType); |
| Element element = exception.staticElement; |
| if (element is VariableElementImpl) { |
| element.type = exceptionType; |
| } else { |
| // TODO(brianwilkerson) Report the internal error |
| } |
| } |
| SimpleIdentifier stackTrace = node.stackTraceParameter; |
| if (stackTrace != null) { |
| _recordType(stackTrace, typeProvider.stackTraceType); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitClassDeclaration(ClassDeclaration node) { |
| ExtendsClause extendsClause = node.extendsClause; |
| WithClause withClause = node.withClause; |
| ImplementsClause implementsClause = node.implementsClause; |
| _hasReferenceToSuper = false; |
| super.visitClassDeclaration(node); |
| ClassElementImpl classElement = _getClassElement(node.name); |
| InterfaceType superclassType = null; |
| if (extendsClause != null) { |
| ErrorCode errorCode = (withClause == null ? |
| CompileTimeErrorCode.EXTENDS_NON_CLASS : |
| CompileTimeErrorCode.MIXIN_WITH_NON_CLASS_SUPERCLASS); |
| superclassType = _resolveType( |
| extendsClause.superclass, |
| errorCode, |
| CompileTimeErrorCode.EXTENDS_ENUM, |
| errorCode); |
| if (!identical(superclassType, typeProvider.objectType)) { |
| classElement.validMixin = false; |
| } |
| } |
| if (classElement != null) { |
| if (superclassType == null) { |
| InterfaceType objectType = typeProvider.objectType; |
| if (!identical(classElement.type, objectType)) { |
| superclassType = objectType; |
| } |
| } |
| classElement.supertype = superclassType; |
| classElement.hasReferenceToSuper = _hasReferenceToSuper; |
| } |
| _resolve(classElement, withClause, implementsClause); |
| return null; |
| } |
| |
| @override |
| void visitClassMembersInScope(ClassDeclaration node) { |
| // |
| // Process field declarations before constructors and methods so that the |
| // types of field formal parameters can be correctly resolved. |
| // |
| List<ClassMember> nonFields = new List<ClassMember>(); |
| node.visitChildren( |
| new _TypeResolverVisitor_visitClassMembersInScope(this, nonFields)); |
| int count = nonFields.length; |
| for (int i = 0; i < count; i++) { |
| nonFields[i].accept(this); |
| } |
| } |
| |
| @override |
| Object visitClassTypeAlias(ClassTypeAlias node) { |
| super.visitClassTypeAlias(node); |
| ErrorCode errorCode = CompileTimeErrorCode.MIXIN_WITH_NON_CLASS_SUPERCLASS; |
| InterfaceType superclassType = _resolveType( |
| node.superclass, |
| errorCode, |
| CompileTimeErrorCode.EXTENDS_ENUM, |
| errorCode); |
| if (superclassType == null) { |
| superclassType = typeProvider.objectType; |
| } |
| ClassElementImpl classElement = _getClassElement(node.name); |
| if (classElement != null) { |
| classElement.supertype = superclassType; |
| } |
| _resolve(classElement, node.withClause, node.implementsClause); |
| return null; |
| } |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| super.visitConstructorDeclaration(node); |
| ExecutableElementImpl element = node.element as ExecutableElementImpl; |
| if (element == null) { |
| ClassDeclaration classNode = |
| node.getAncestor((node) => node is ClassDeclaration); |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("The element for the constructor "); |
| buffer.write(node.name == null ? "<unnamed>" : node.name.name); |
| buffer.write(" in "); |
| if (classNode == null) { |
| buffer.write("<unknown class>"); |
| } else { |
| buffer.write(classNode.name.name); |
| } |
| buffer.write(" in "); |
| buffer.write(source.fullName); |
| buffer.write(" was not set while trying to resolve types."); |
| AnalysisEngine.instance.logger.logError( |
| buffer.toString(), |
| new CaughtException(new AnalysisException(), null)); |
| } else { |
| ClassElement definingClass = element.enclosingElement as ClassElement; |
| element.returnType = definingClass.type; |
| FunctionTypeImpl type = new FunctionTypeImpl.con1(element); |
| type.typeArguments = definingClass.type.typeArguments; |
| element.type = type; |
| } |
| return null; |
| } |
| |
| @override |
| Object visitDeclaredIdentifier(DeclaredIdentifier node) { |
| super.visitDeclaredIdentifier(node); |
| DartType declaredType; |
| TypeName typeName = node.type; |
| if (typeName == null) { |
| declaredType = _dynamicType; |
| } else { |
| declaredType = _getType(typeName); |
| } |
| LocalVariableElementImpl element = node.element as LocalVariableElementImpl; |
| element.type = declaredType; |
| return null; |
| } |
| |
| @override |
| Object visitFieldFormalParameter(FieldFormalParameter node) { |
| super.visitFieldFormalParameter(node); |
| Element element = node.identifier.staticElement; |
| if (element is ParameterElementImpl) { |
| ParameterElementImpl parameter = element; |
| FormalParameterList parameterList = node.parameters; |
| if (parameterList == null) { |
| DartType type; |
| TypeName typeName = node.type; |
| if (typeName == null) { |
| type = _dynamicType; |
| if (parameter is FieldFormalParameterElement) { |
| FieldElement fieldElement = |
| (parameter as FieldFormalParameterElement).field; |
| if (fieldElement != null) { |
| type = fieldElement.type; |
| } |
| } |
| } else { |
| type = _getType(typeName); |
| } |
| parameter.type = type; |
| } else { |
| _setFunctionTypedParameterType(parameter, node.type, node.parameters); |
| } |
| } else { |
| // TODO(brianwilkerson) Report this internal error |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) { |
| super.visitFunctionDeclaration(node); |
| ExecutableElementImpl element = node.element as ExecutableElementImpl; |
| if (element == null) { |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("The element for the top-level function "); |
| buffer.write(node.name); |
| buffer.write(" in "); |
| buffer.write(source.fullName); |
| buffer.write(" was not set while trying to resolve types."); |
| AnalysisEngine.instance.logger.logError( |
| buffer.toString(), |
| new CaughtException(new AnalysisException(), null)); |
| } |
| element.returnType = _computeReturnType(node.returnType); |
| FunctionTypeImpl type = new FunctionTypeImpl.con1(element); |
| ClassElement definingClass = |
| element.getAncestor((element) => element is ClassElement); |
| if (definingClass != null) { |
| type.typeArguments = definingClass.type.typeArguments; |
| } |
| element.type = type; |
| return null; |
| } |
| |
| @override |
| Object visitFunctionTypeAlias(FunctionTypeAlias node) { |
| FunctionTypeAliasElementImpl element = |
| node.element as FunctionTypeAliasElementImpl; |
| if (element.returnType == null) { |
| // Only visit function type aliases once. |
| super.visitFunctionTypeAlias(node); |
| element.returnType = _computeReturnType(node.returnType); |
| } |
| return null; |
| } |
| |
| @override |
| Object visitFunctionTypedFormalParameter(FunctionTypedFormalParameter node) { |
| super.visitFunctionTypedFormalParameter(node); |
| Element element = node.identifier.staticElement; |
| if (element is ParameterElementImpl) { |
| _setFunctionTypedParameterType(element, node.returnType, node.parameters); |
| } else { |
| // TODO(brianwilkerson) Report this internal error |
| } |
| return null; |
| } |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| super.visitMethodDeclaration(node); |
| ExecutableElementImpl element = node.element as ExecutableElementImpl; |
| if (element == null) { |
| ClassDeclaration classNode = |
| node.getAncestor((node) => node is ClassDeclaration); |
| StringBuffer buffer = new StringBuffer(); |
| buffer.write("The element for the method "); |
| buffer.write(node.name.name); |
| buffer.write(" in "); |
| if (classNode == null) { |
| buffer.write("<unknown class>"); |
| } else { |
| buffer.write(classNode.name.name); |
| } |
| buffer.write(" in "); |
| buffer.write(source.fullName); |
| buffer.write(" was not set while trying to resolve types."); |
| AnalysisEngine.instance.logger.logError( |
| buffer.toString(), |
| new CaughtException(new AnalysisException(), null)); |
| } |
| element.returnType = _computeReturnType(node.returnType); |
| FunctionTypeImpl type = new FunctionTypeImpl.con1(element); |
| ClassElement definingClass = |
| element.getAncestor((element) => element is ClassElement); |
| if (definingClass != null) { |
| type.typeArguments = definingClass.type.typeArguments; |
| } |
| element.type = type; |
| if (element is PropertyAccessorElement) { |
| PropertyAccessorElement accessor = element as PropertyAccessorElement; |
| PropertyInducingElementImpl variable = |
| accessor.variable as PropertyInducingElementImpl; |
| if (accessor.isGetter) { |
| variable.type = type.returnType; |
| } else if (variable.type == null) { |
| List<DartType> parameterTypes = type.normalParameterTypes; |
| if (parameterTypes != null && parameterTypes.length > 0) { |
| variable.type = parameterTypes[0]; |
| } |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitSimpleFormalParameter(SimpleFormalParameter node) { |
| super.visitSimpleFormalParameter(node); |
| DartType declaredType; |
| TypeName typeName = node.type; |
| if (typeName == null) { |
| declaredType = _dynamicType; |
| } else { |
| declaredType = _getType(typeName); |
| } |
| Element element = node.identifier.staticElement; |
| if (element is ParameterElement) { |
| (element as ParameterElementImpl).type = declaredType; |
| } else { |
| // TODO(brianwilkerson) Report the internal error. |
| } |
| return null; |
| } |
| |
| @override |
| Object visitSuperExpression(SuperExpression node) { |
| _hasReferenceToSuper = true; |
| return super.visitSuperExpression(node); |
| } |
| |
| @override |
| Object visitTypeName(TypeName node) { |
| super.visitTypeName(node); |
| Identifier typeName = node.name; |
| TypeArgumentList argumentList = node.typeArguments; |
| Element element = nameScope.lookup(typeName, definingLibrary); |
| if (element == null) { |
| // |
| // Check to see whether the type name is either 'dynamic' or 'void', |
| // neither of which are in the name scope and hence will not be found by |
| // normal means. |
| // |
| if (typeName.name == _dynamicType.name) { |
| _setElement(typeName, _dynamicType.element); |
| if (argumentList != null) { |
| // TODO(brianwilkerson) Report this error |
| // reporter.reportError(StaticTypeWarningCode.WRONG_NUMBER_OF_TYPE_ARGUMENTS, node, dynamicType.getName(), 0, argumentList.getArguments().size()); |
| } |
| typeName.staticType = _dynamicType; |
| node.type = _dynamicType; |
| return null; |
| } |
| VoidTypeImpl voidType = VoidTypeImpl.instance; |
| if (typeName.name == voidType.name) { |
| // There is no element for 'void'. |
| if (argumentList != null) { |
| // TODO(brianwilkerson) Report this error |
| // reporter.reportError(StaticTypeWarningCode.WRONG_NUMBER_OF_TYPE_ARGUMENTS, node, voidType.getName(), 0, argumentList.getArguments().size()); |
| } |
| typeName.staticType = voidType; |
| node.type = voidType; |
| return null; |
| } |
| // |
| // If not, the look to see whether we might have created the wrong AST |
| // structure for a constructor name. If so, fix the AST structure and then |
| // proceed. |
| // |
| AstNode parent = node.parent; |
| if (typeName is PrefixedIdentifier && |
| parent is ConstructorName && |
| argumentList == null) { |
| ConstructorName name = parent; |
| if (name.name == null) { |
| PrefixedIdentifier prefixedIdentifier = |
| typeName as PrefixedIdentifier; |
| SimpleIdentifier prefix = prefixedIdentifier.prefix; |
| element = nameScope.lookup(prefix, definingLibrary); |
| if (element is PrefixElement) { |
| if (parent.parent is InstanceCreationExpression && |
| (parent.parent as InstanceCreationExpression).isConst) { |
| // If, if this is a const expression, then generate a |
| // CompileTimeErrorCode.CONST_WITH_NON_TYPE error. |
| reportErrorForNode( |
| CompileTimeErrorCode.CONST_WITH_NON_TYPE, |
| prefixedIdentifier.identifier, |
| [prefixedIdentifier.identifier.name]); |
| } else { |
| // Else, if this expression is a new expression, report a |
| // NEW_WITH_NON_TYPE warning. |
| reportErrorForNode( |
| StaticWarningCode.NEW_WITH_NON_TYPE, |
| prefixedIdentifier.identifier, |
| [prefixedIdentifier.identifier.name]); |
| } |
| _setElement(prefix, element); |
| return null; |
| } else if (element != null) { |
| // |
| // Rewrite the constructor name. The parser, when it sees a |
| // constructor named "a.b", cannot tell whether "a" is a prefix and |
| // "b" is a class name, or whether "a" is a class name and "b" is a |
| // constructor name. It arbitrarily chooses the former, but in this |
| // case was wrong. |
| // |
| name.name = prefixedIdentifier.identifier; |
| name.period = prefixedIdentifier.period; |
| node.name = prefix; |
| typeName = prefix; |
| } |
| } |
| } |
| } |
| // check element |
| bool elementValid = element is! MultiplyDefinedElement; |
| if (elementValid && |
| element is! ClassElement && |
| _isTypeNameInInstanceCreationExpression(node)) { |
| SimpleIdentifier typeNameSimple = _getTypeSimpleIdentifier(typeName); |
| InstanceCreationExpression creation = |
| node.parent.parent as InstanceCreationExpression; |
| if (creation.isConst) { |
| if (element == null) { |
| reportErrorForNode( |
| CompileTimeErrorCode.UNDEFINED_CLASS, |
| typeNameSimple, |
| [typeName]); |
| } else { |
| reportErrorForNode( |
| CompileTimeErrorCode.CONST_WITH_NON_TYPE, |
| typeNameSimple, |
| [typeName]); |
| } |
| elementValid = false; |
| } else { |
| if (element != null) { |
| reportErrorForNode( |
| StaticWarningCode.NEW_WITH_NON_TYPE, |
| typeNameSimple, |
| [typeName]); |
| elementValid = false; |
| } |
| } |
| } |
| if (elementValid && element == null) { |
| // We couldn't resolve the type name. |
| // TODO(jwren) Consider moving the check for |
| // CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE from the |
| // ErrorVerifier, so that we don't have two errors on a built in |
| // identifier being used as a class name. |
| // See CompileTimeErrorCodeTest.test_builtInIdentifierAsType(). |
| SimpleIdentifier typeNameSimple = _getTypeSimpleIdentifier(typeName); |
| RedirectingConstructorKind redirectingConstructorKind; |
| if (_isBuiltInIdentifier(node) && _isTypeAnnotation(node)) { |
| reportErrorForNode( |
| CompileTimeErrorCode.BUILT_IN_IDENTIFIER_AS_TYPE, |
| typeName, |
| [typeName.name]); |
| } else if (typeNameSimple.name == "boolean") { |
| reportErrorForNode( |
| StaticWarningCode.UNDEFINED_CLASS_BOOLEAN, |
| typeNameSimple, |
| []); |
| } else if (_isTypeNameInCatchClause(node)) { |
| reportErrorForNode( |
| StaticWarningCode.NON_TYPE_IN_CATCH_CLAUSE, |
| typeName, |
| [typeName.name]); |
| } else if (_isTypeNameInAsExpression(node)) { |
| reportErrorForNode( |
| StaticWarningCode.CAST_TO_NON_TYPE, |
| typeName, |
| [typeName.name]); |
| } else if (_isTypeNameInIsExpression(node)) { |
| reportErrorForNode( |
| StaticWarningCode.TYPE_TEST_WITH_UNDEFINED_NAME, |
| typeName, |
| [typeName.name]); |
| } else if ((redirectingConstructorKind = |
| _getRedirectingConstructorKind(node)) != null) { |
| ErrorCode errorCode = |
| (redirectingConstructorKind == RedirectingConstructorKind.CONST ? |
| CompileTimeErrorCode.REDIRECT_TO_NON_CLASS : |
| StaticWarningCode.REDIRECT_TO_NON_CLASS); |
| reportErrorForNode(errorCode, typeName, [typeName.name]); |
| } else if (_isTypeNameInTypeArgumentList(node)) { |
| reportErrorForNode( |
| StaticTypeWarningCode.NON_TYPE_AS_TYPE_ARGUMENT, |
| typeName, |
| [typeName.name]); |
| } else { |
| reportErrorForNode( |
| StaticWarningCode.UNDEFINED_CLASS, |
| typeName, |
| [typeName.name]); |
| } |
| elementValid = false; |
| } |
| if (!elementValid) { |
| if (element is MultiplyDefinedElement) { |
| _setElement(typeName, element); |
| } else { |
| _setElement(typeName, _dynamicType.element); |
| } |
| typeName.staticType = _undefinedType; |
| node.type = _undefinedType; |
| return null; |
| } |
| DartType type = null; |
| if (element is ClassElement) { |
| _setElement(typeName, element); |
| type = (element as ClassElement).type; |
| } else if (element is FunctionTypeAliasElement) { |
| _setElement(typeName, element); |
| type = (element as FunctionTypeAliasElement).type; |
| } else if (element is TypeParameterElement) { |
| _setElement(typeName, element); |
| type = (element as TypeParameterElement).type; |
| if (argumentList != null) { |
| // Type parameters cannot have type arguments. |
| // TODO(brianwilkerson) Report this error. |
| // resolver.reportError(ResolverErrorCode.?, keyType); |
| } |
| } else if (element is MultiplyDefinedElement) { |
| List<Element> elements = |
| (element as MultiplyDefinedElement).conflictingElements; |
| type = _getTypeWhenMultiplyDefined(elements); |
| if (type != null) { |
| node.type = type; |
| } |
| } else { |
| // The name does not represent a type. |
| RedirectingConstructorKind redirectingConstructorKind; |
| if (_isTypeNameInCatchClause(node)) { |
| reportErrorForNode( |
| StaticWarningCode.NON_TYPE_IN_CATCH_CLAUSE, |
| typeName, |
| [typeName.name]); |
| } else if (_isTypeNameInAsExpression(node)) { |
| reportErrorForNode( |
| StaticWarningCode.CAST_TO_NON_TYPE, |
| typeName, |
| [typeName.name]); |
| } else if (_isTypeNameInIsExpression(node)) { |
| reportErrorForNode( |
| StaticWarningCode.TYPE_TEST_WITH_NON_TYPE, |
| typeName, |
| [typeName.name]); |
| } else if ((redirectingConstructorKind = |
| _getRedirectingConstructorKind(node)) != null) { |
| ErrorCode errorCode = |
| (redirectingConstructorKind == RedirectingConstructorKind.CONST ? |
| CompileTimeErrorCode.REDIRECT_TO_NON_CLASS : |
| StaticWarningCode.REDIRECT_TO_NON_CLASS); |
| reportErrorForNode(errorCode, typeName, [typeName.name]); |
| } else if (_isTypeNameInTypeArgumentList(node)) { |
| reportErrorForNode( |
| StaticTypeWarningCode.NON_TYPE_AS_TYPE_ARGUMENT, |
| typeName, |
| [typeName.name]); |
| } else { |
| AstNode parent = typeName.parent; |
| while (parent is TypeName) { |
| parent = parent.parent; |
| } |
| if (parent is ExtendsClause || |
| parent is ImplementsClause || |
| parent is WithClause || |
| parent is ClassTypeAlias) { |
| // Ignored. The error will be reported elsewhere. |
| } else { |
| reportErrorForNode( |
| StaticWarningCode.NOT_A_TYPE, |
| typeName, |
| [typeName.name]); |
| } |
| } |
| _setElement(typeName, _dynamicType.element); |
| typeName.staticType = _dynamicType; |
| node.type = _dynamicType; |
| return null; |
| } |
| if (argumentList != null) { |
| NodeList<TypeName> arguments = argumentList.arguments; |
| int argumentCount = arguments.length; |
| List<DartType> parameters = _getTypeArguments(type); |
| int parameterCount = parameters.length; |
| List<DartType> typeArguments = new List<DartType>(parameterCount); |
| if (argumentCount == parameterCount) { |
| for (int i = 0; i < parameterCount; i++) { |
| TypeName argumentTypeName = arguments[i]; |
| DartType argumentType = _getType(argumentTypeName); |
| if (argumentType == null) { |
| argumentType = _dynamicType; |
| } |
| typeArguments[i] = argumentType; |
| } |
| } else { |
| reportErrorForNode( |
| _getInvalidTypeParametersErrorCode(node), |
| node, |
| [typeName.name, parameterCount, argumentCount]); |
| for (int i = 0; i < parameterCount; i++) { |
| typeArguments[i] = _dynamicType; |
| } |
| } |
| if (type is InterfaceTypeImpl) { |
| InterfaceTypeImpl interfaceType = type as InterfaceTypeImpl; |
| type = interfaceType.substitute4(typeArguments); |
| } else if (type is FunctionTypeImpl) { |
| FunctionTypeImpl functionType = type as FunctionTypeImpl; |
| type = functionType.substitute3(typeArguments); |
| } else { |
| // TODO(brianwilkerson) Report this internal error. |
| } |
| } else { |
| // |
| // Check for the case where there are no type arguments given for a |
| // parameterized type. |
| // |
| List<DartType> parameters = _getTypeArguments(type); |
| int parameterCount = parameters.length; |
| if (parameterCount > 0) { |
| DynamicTypeImpl dynamicType = DynamicTypeImpl.instance; |
| List<DartType> arguments = new List<DartType>(parameterCount); |
| for (int i = 0; i < parameterCount; i++) { |
| arguments[i] = dynamicType; |
| } |
| type = type.substitute2(arguments, parameters); |
| } |
| } |
| typeName.staticType = type; |
| node.type = type; |
| return null; |
| } |
| |
| @override |
| Object visitTypeParameter(TypeParameter node) { |
| super.visitTypeParameter(node); |
| TypeName bound = node.bound; |
| if (bound != null) { |
| TypeParameterElementImpl typeParameter = |
| node.name.staticElement as TypeParameterElementImpl; |
| if (typeParameter != null) { |
| typeParameter.bound = bound.type; |
| } |
| } |
| return null; |
| } |
| |
| @override |
| Object visitVariableDeclaration(VariableDeclaration node) { |
| super.visitVariableDeclaration(node); |
| DartType declaredType; |
| TypeName typeName = (node.parent as VariableDeclarationList).type; |
| if (typeName == null) { |
| declaredType = _dynamicType; |
| } else { |
| declaredType = _getType(typeName); |
| } |
| Element element = node.name.staticElement; |
| if (element is VariableElement) { |
| (element as VariableElementImpl).type = declaredType; |
| if (element is PropertyInducingElement) { |
| PropertyInducingElement variableElement = element; |
| PropertyAccessorElementImpl getter = |
| variableElement.getter as PropertyAccessorElementImpl; |
| getter.returnType = declaredType; |
| FunctionTypeImpl getterType = new FunctionTypeImpl.con1(getter); |
| ClassElement definingClass = |
| element.getAncestor((element) => element is ClassElement); |
| if (definingClass != null) { |
| getterType.typeArguments = definingClass.type.typeArguments; |
| } |
| getter.type = getterType; |
| PropertyAccessorElementImpl setter = |
| variableElement.setter as PropertyAccessorElementImpl; |
| if (setter != null) { |
| List<ParameterElement> parameters = setter.parameters; |
| if (parameters.length > 0) { |
| (parameters[0] as ParameterElementImpl).type = declaredType; |
| } |
| setter.returnType = VoidTypeImpl.instance; |
| FunctionTypeImpl setterType = new FunctionTypeImpl.con1(setter); |
| if (definingClass != null) { |
| setterType.typeArguments = definingClass.type.typeArguments; |
| } |
| setter.type = setterType; |
| } |
| } |
| } else { |
| // TODO(brianwilkerson) Report the internal error. |
| } |
| return null; |
| } |
| |
| /** |
| * Given a type name representing the return type of a function, compute the return type of the |
| * function. |
| * |
| * @param returnType the type name representing the return type of the function |
| * @return the return type that was computed |
| */ |
| DartType _computeReturnType(TypeName returnType) { |
| if (returnType == null) { |
| return _dynamicType; |
| } else { |
| return returnType.type; |
| } |
| } |
| |
| /** |
| * Return the class element that represents the class whose name was provided. |
| * |
| * @param identifier the name from the declaration of a class |
| * @return the class element that represents the class |
| */ |
| ClassElementImpl _getClassElement(SimpleIdentifier identifier) { |
| // TODO(brianwilkerson) Seems like we should be using |
| // ClassDeclaration.getElement(). |
| if (identifier == null) { |
| // TODO(brianwilkerson) Report this |
| // Internal error: We should never build a class declaration without a |
| // name. |
| return null; |
| } |
| Element element = identifier.staticElement; |
| if (element is! ClassElementImpl) { |
| // TODO(brianwilkerson) Report this |
| // Internal error: Failed to create an element for a class declaration. |
| return null; |
| } |
| return element as ClassElementImpl; |
| } |
| |
| /** |
| * Return an array containing all of the elements associated with the parameters in the given |
| * list. |
| * |
| * @param parameterList the list of parameters whose elements are to be returned |
| * @return the elements associated with the parameters |
| */ |
| List<ParameterElement> _getElements(FormalParameterList parameterList) { |
| List<ParameterElement> elements = new List<ParameterElement>(); |
| for (FormalParameter parameter in parameterList.parameters) { |
| ParameterElement element = |
| parameter.identifier.staticElement as ParameterElement; |
| // TODO(brianwilkerson) Understand why the element would be null. |
| if (element != null) { |
| elements.add(element); |
| } |
| } |
| return elements; |
| } |
| |
| /** |
| * The number of type arguments in the given type name does not match the number of parameters in |
| * the corresponding class element. Return the error code that should be used to report this |
| * error. |
| * |
| * @param node the type name with the wrong number of type arguments |
| * @return the error code that should be used to report that the wrong number of type arguments |
| * were provided |
| */ |
| ErrorCode _getInvalidTypeParametersErrorCode(TypeName node) { |
| AstNode parent = node.parent; |
| if (parent is ConstructorName) { |
| parent = parent.parent; |
| if (parent is InstanceCreationExpression) { |
| if ((parent as InstanceCreationExpression).isConst) { |
| return CompileTimeErrorCode.CONST_WITH_INVALID_TYPE_PARAMETERS; |
| } else { |
| return StaticWarningCode.NEW_WITH_INVALID_TYPE_PARAMETERS; |
| } |
| } |
| } |
| return StaticTypeWarningCode.WRONG_NUMBER_OF_TYPE_ARGUMENTS; |
| } |
| |
| /** |
| * Checks if the given type name is the target in a redirected constructor. |
| * |
| * @param typeName the type name to analyze |
| * @return some [RedirectingConstructorKind] if the given type name is used as the type in a |
| * redirected constructor, or `null` otherwise |
| */ |
| RedirectingConstructorKind _getRedirectingConstructorKind(TypeName typeName) { |
| AstNode parent = typeName.parent; |
| if (parent is ConstructorName) { |
| ConstructorName constructorName = parent as ConstructorName; |
| parent = constructorName.parent; |
| if (parent is ConstructorDeclaration) { |
| ConstructorDeclaration constructorDeclaration = |
| parent as ConstructorDeclaration; |
| if (identical( |
| constructorDeclaration.redirectedConstructor, |
| constructorName)) { |
| if (constructorDeclaration.constKeyword != null) { |
| return RedirectingConstructorKind.CONST; |
| } |
| return RedirectingConstructorKind.NORMAL; |
| } |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Return the type represented by the given type name. |
| * |
| * @param typeName the type name representing the type to be returned |
| * @return the type represented by the type name |
| */ |
| DartType _getType(TypeName typeName) { |
| DartType type = typeName.type; |
| if (type == null) { |
| return _undefinedType; |
| } |
| return type; |
| } |
| |
| /** |
| * Return the type arguments associated with the given type. |
| * |
| * @param type the type whole type arguments are to be returned |
| * @return the type arguments associated with the given type |
| */ |
| List<DartType> _getTypeArguments(DartType type) { |
| if (type is InterfaceType) { |
| return type.typeArguments; |
| } else if (type is FunctionType) { |
| return type.typeArguments; |
| } |
| return TypeImpl.EMPTY_ARRAY; |
| } |
| |
| /** |
| * Returns the simple identifier of the given (may be qualified) type name. |
| * |
| * @param typeName the (may be qualified) qualified type name |
| * @return the simple identifier of the given (may be qualified) type name. |
| */ |
| SimpleIdentifier _getTypeSimpleIdentifier(Identifier typeName) { |
| if (typeName is SimpleIdentifier) { |
| return typeName; |
| } else { |
| return (typeName as PrefixedIdentifier).identifier; |
| } |
| } |
| |
| /** |
| * Given the multiple elements to which a single name could potentially be resolved, return the |
| * single interface type that should be used, or `null` if there is no clear choice. |
| * |
| * @param elements the elements to which a single name could potentially be resolved |
| * @return the single interface type that should be used for the type name |
| */ |
| InterfaceType _getTypeWhenMultiplyDefined(List<Element> elements) { |
| InterfaceType type = null; |
| for (Element element in elements) { |
| if (element is ClassElement) { |
| if (type != null) { |
| return null; |
| } |
| type = element.type; |
| } |
| } |
| return type; |
| } |
| |
| /** |
| * Checks if the given type name is used as the type in an as expression. |
| * |
| * @param typeName the type name to analyzer |
| * @return `true` if the given type name is used as the type in an as expression |
| */ |
| bool _isTypeNameInAsExpression(TypeName typeName) { |
| AstNode parent = typeName.parent; |
| if (parent is AsExpression) { |
| AsExpression asExpression = parent; |
| return identical(asExpression.type, typeName); |
| } |
| return false; |
| } |
| |
| /** |
| * Checks if the given type name is used as the exception type in a catch clause. |
| * |
| * @param typeName the type name to analyzer |
| * @return `true` if the given type name is used as the exception type in a catch clause |
| */ |
| bool _isTypeNameInCatchClause(TypeName typeName) { |
| AstNode parent = typeName.parent; |
| if (parent is CatchClause) { |
| CatchClause catchClause = parent; |
| return identical(catchClause.exceptionType, typeName); |
| } |
| return false; |
| } |
| |
| /** |
| * Checks if the given type name is used as the type in an instance creation expression. |
| * |
| * @param typeName the type name to analyzer |
| * @return `true` if the given type name is used as the type in an instance creation |
| * expression |
| */ |
| bool _isTypeNameInInstanceCreationExpression(TypeName typeName) { |
| AstNode parent = typeName.parent; |
| if (parent is ConstructorName && |
| parent.parent is InstanceCreationExpression) { |
| ConstructorName constructorName = parent; |
| return constructorName != null && |
| identical(constructorName.type, typeName); |
| } |
| return false; |
| } |
| |
| /** |
| * Checks if the given type name is used as the type in an is expression. |
| * |
| * @param typeName the type name to analyzer |
| * @return `true` if the given type name is used as the type in an is expression |
| */ |
| bool _isTypeNameInIsExpression(TypeName typeName) { |
| AstNode parent = typeName.parent; |
| if (parent is IsExpression) { |
| IsExpression isExpression = parent; |
| return identical(isExpression.type, typeName); |
| } |
| return false; |
| } |
| |
| /** |
| * Checks if the given type name used in a type argument list. |
| * |
| * @param typeName the type name to analyzer |
| * @return `true` if the given type name is in a type argument list |
| */ |
| bool _isTypeNameInTypeArgumentList(TypeName typeName) => |
| typeName.parent is TypeArgumentList; |
| |
| /** |
| * Record that the static type of the given node is the given type. |
| * |
| * @param expression the node whose type is to be recorded |
| * @param type the static type of the node |
| */ |
| Object _recordType(Expression expression, DartType type) { |
| if (type == null) { |
| expression.staticType = _dynamicType; |
| } else { |
| expression.staticType = type; |
| } |
| return null; |
| } |
| |
| /** |
| * Resolve the types in the given with and implements clauses and associate those types with the |
| * given class element. |
| * |
| * @param classElement the class element with which the mixin and interface types are to be |
| * associated |
| * @param withClause the with clause to be resolved |
| * @param implementsClause the implements clause to be resolved |
| */ |
| void _resolve(ClassElementImpl classElement, WithClause withClause, |
| ImplementsClause implementsClause) { |
| if (withClause != null) { |
| List<InterfaceType> mixinTypes = _resolveTypes( |
| withClause.mixinTypes, |
| CompileTimeErrorCode.MIXIN_OF_NON_CLASS, |
| CompileTimeErrorCode.MIXIN_OF_ENUM, |
| CompileTimeErrorCode.MIXIN_OF_NON_CLASS); |
| if (classElement != null) { |
| classElement.mixins = mixinTypes; |
| } |
| } |
| if (implementsClause != null) { |
| NodeList<TypeName> interfaces = implementsClause.interfaces; |
| List<InterfaceType> interfaceTypes = _resolveTypes( |
| interfaces, |
| CompileTimeErrorCode.IMPLEMENTS_NON_CLASS, |
| CompileTimeErrorCode.IMPLEMENTS_ENUM, |
| CompileTimeErrorCode.IMPLEMENTS_DYNAMIC); |
| if (classElement != null) { |
| classElement.interfaces = interfaceTypes; |
| } |
| // TODO(brianwilkerson) Move the following checks to ErrorVerifier. |
| int count = interfaces.length; |
| List<bool> detectedRepeatOnIndex = new List<bool>.filled(count, false); |
| for (int i = 0; i < detectedRepeatOnIndex.length; i++) { |
| detectedRepeatOnIndex[i] = false; |
| } |
| for (int i = 0; i < count; i++) { |
| TypeName typeName = interfaces[i]; |
| if (!detectedRepeatOnIndex[i]) { |
| Element element = typeName.name.staticElement; |
| for (int j = i + 1; j < count; j++) { |
| TypeName typeName2 = interfaces[j]; |
| Identifier identifier2 = typeName2.name; |
| String name2 = identifier2.name; |
| Element element2 = identifier2.staticElement; |
| if (element != null && element == element2) { |
| detectedRepeatOnIndex[j] = true; |
| reportErrorForNode( |
| CompileTimeErrorCode.IMPLEMENTS_REPEATED, |
| typeName2, |
| [name2]); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Return the type specified by the given name. |
| * |
| * @param typeName the type name specifying the type to be returned |
| * @param nonTypeError the error to produce if the type name is defined to be something other than |
| * a type |
| * @param enumTypeError the error to produce if the type name is defined to be an enum |
| * @param dynamicTypeError the error to produce if the type name is "dynamic" |
| * @return the type specified by the type name |
| */ |
| InterfaceType _resolveType(TypeName typeName, ErrorCode nonTypeError, |
| ErrorCode enumTypeError, ErrorCode dynamicTypeError) { |
| DartType type = typeName.type; |
| if (type is InterfaceType) { |
| ClassElement element = type.element; |
| if (element != null && element.isEnum) { |
| reportErrorForNode(enumTypeError, typeName); |
| return null; |
| } |
| return type; |
| } |
| // If the type is not an InterfaceType, then visitTypeName() sets the type |
| // to be a DynamicTypeImpl |
| Identifier name = typeName.name; |
| if (name.name == sc.Keyword.DYNAMIC.syntax) { |
| reportErrorForNode(dynamicTypeError, name, [name.name]); |
| } else { |
| reportErrorForNode(nonTypeError, name, [name.name]); |
| } |
| return null; |
| } |
| |
| /** |
| * Resolve the types in the given list of type names. |
| * |
| * @param typeNames the type names to be resolved |
| * @param nonTypeError the error to produce if the type name is defined to be something other than |
| * a type |
| * @param enumTypeError the error to produce if the type name is defined to be an enum |
| * @param dynamicTypeError the error to produce if the type name is "dynamic" |
| * @return an array containing all of the types that were resolved. |
| */ |
| List<InterfaceType> _resolveTypes(NodeList<TypeName> typeNames, |
| ErrorCode nonTypeError, ErrorCode enumTypeError, ErrorCode dynamicTypeError) { |
| List<InterfaceType> types = new List<InterfaceType>(); |
| for (TypeName typeName in typeNames) { |
| InterfaceType type = |
| _resolveType(typeName, nonTypeError, enumTypeError, dynamicTypeError); |
| if (type != null) { |
| types.add(type); |
| } |
| } |
| return types; |
| } |
| |
| void _setElement(Identifier typeName, Element element) { |
| if (element != null) { |
| if (typeName is SimpleIdentifier) { |
| typeName.staticElement = element; |
| } else if (typeName is PrefixedIdentifier) { |
| PrefixedIdentifier identifier = typeName; |
| identifier.identifier.staticElement = element; |
| SimpleIdentifier prefix = identifier.prefix; |
| Element prefixElement = nameScope.lookup(prefix, definingLibrary); |
| if (prefixElement != null) { |
| prefix.staticElement = prefixElement; |
| } |
| } |
| } |
| } |
| |
| /** |
| * Given a parameter element, create a function type based on the given return type and parameter |
| * list and associate the created type with the element. |
| * |
| * @param element the parameter element whose type is to be set |
| * @param returnType the (possibly `null`) return type of the function |
| * @param parameterList the list of parameters to the function |
| */ |
| void _setFunctionTypedParameterType(ParameterElementImpl element, |
| TypeName returnType, FormalParameterList parameterList) { |
| List<ParameterElement> parameters = _getElements(parameterList); |
| FunctionTypeAliasElementImpl aliasElement = |
| new FunctionTypeAliasElementImpl.forNode(null); |
| aliasElement.synthetic = true; |
| aliasElement.shareParameters(parameters); |
| aliasElement.returnType = _computeReturnType(returnType); |
| // FunctionTypeAliasElementImpl assumes the enclosing element is a |
| // CompilationUnitElement (because non-synthetic function types can only be |
| // declared at top level), so to avoid breaking things, go find the |
| // compilation unit element. |
| aliasElement.enclosingElement = |
| element.getAncestor((element) => element is CompilationUnitElement); |
| FunctionTypeImpl type = new FunctionTypeImpl.con2(aliasElement); |
| ClassElement definingClass = |
| element.getAncestor((element) => element is ClassElement); |
| if (definingClass != null) { |
| aliasElement.shareTypeParameters(definingClass.typeParameters); |
| type.typeArguments = definingClass.type.typeArguments; |
| } else { |
| FunctionTypeAliasElement alias = |
| element.getAncestor((element) => element is FunctionTypeAliasElement); |
| while (alias != null && alias.isSynthetic) { |
| alias = |
| alias.getAncestor((element) => element is FunctionTypeAliasElement); |
| } |
| if (alias != null) { |
| aliasElement.typeParameters = alias.typeParameters; |
| type.typeArguments = alias.type.typeArguments; |
| } else { |
| type.typeArguments = TypeImpl.EMPTY_ARRAY; |
| } |
| } |
| element.type = type; |
| } |
| |
| /** |
| * @return `true` if the name of the given [TypeName] is an built-in identifier. |
| */ |
| static bool _isBuiltInIdentifier(TypeName node) { |
| sc.Token token = node.name.beginToken; |
| return token.type == sc.TokenType.KEYWORD; |
| } |
| |
| /** |
| * @return `true` if given [TypeName] is used as a type annotation. |
| */ |
| static bool _isTypeAnnotation(TypeName node) { |
| AstNode parent = node.parent; |
| if (parent is VariableDeclarationList) { |
| return identical(parent.type, node); |
| } |
| if (parent is FieldFormalParameter) { |
| return identical(parent.type, node); |
| } |
| if (parent is SimpleFormalParameter) { |
| return identical(parent.type, node); |
| } |
| return false; |
| } |
| } |
| |
| /** |
| * Instances of the class `VariableResolverVisitor` are used to resolve |
| * [SimpleIdentifier]s to local variables and formal parameters. |
| */ |
| class VariableResolverVisitor extends ScopedVisitor { |
| /** |
| * The method or function that we are currently visiting, or `null` if we are not inside a |
| * method or function. |
| */ |
| ExecutableElement _enclosingFunction; |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| VariableResolverVisitor.con1(Library library, Source source, |
| TypeProvider typeProvider) |
| : super.con1(library, source, typeProvider); |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in an AST node. |
| * |
| * @param definingLibrary the element for the library containing the node being visited |
| * @param source the source representing the compilation unit containing the node being visited |
| * @param typeProvider the object used to access the types from the core library |
| * @param nameScope the scope used to resolve identifiers in the node that will first be visited |
| * @param errorListener the error listener that will be informed of any errors that are found |
| * during resolution |
| */ |
| VariableResolverVisitor.con2(LibraryElement definingLibrary, Source source, |
| TypeProvider typeProvider, Scope nameScope, AnalysisErrorListener errorListener) |
| : super.con3( |
| definingLibrary, |
| source, |
| typeProvider, |
| nameScope, |
| errorListener); |
| |
| /** |
| * Initialize a newly created visitor to resolve the nodes in a compilation unit. |
| * |
| * @param library the library containing the compilation unit being resolved |
| * @param source the source representing the compilation unit being visited |
| * @param typeProvider the object used to access the types from the core library |
| */ |
| VariableResolverVisitor.con3(ResolvableLibrary library, Source source, |
| TypeProvider typeProvider) |
| : super.con4(library, source, typeProvider); |
| |
| @override |
| Object visitExportDirective(ExportDirective node) => null; |
| |
| @override |
| Object visitFunctionDeclaration(FunctionDeclaration node) { |
| ExecutableElement outerFunction = _enclosingFunction; |
| try { |
| _enclosingFunction = node.element; |
| return super.visitFunctionDeclaration(node); |
| } finally { |
| _enclosingFunction = outerFunction; |
| } |
| } |
| |
| @override |
| Object visitFunctionExpression(FunctionExpression node) { |
| if (node.parent is! FunctionDeclaration) { |
| ExecutableElement outerFunction = _enclosingFunction; |
| try { |
| _enclosingFunction = node.element; |
| return super.visitFunctionExpression(node); |
| } finally { |
| _enclosingFunction = outerFunction; |
| } |
| } else { |
| return super.visitFunctionExpression(node); |
| } |
| } |
| |
| @override |
| Object visitImportDirective(ImportDirective node) => null; |
| |
| @override |
| Object visitSimpleIdentifier(SimpleIdentifier node) { |
| // Ignore if already resolved - declaration or type. |
| if (node.staticElement != null) { |
| return null; |
| } |
| // Ignore if qualified. |
| AstNode parent = node.parent; |
| if (parent is PrefixedIdentifier && identical(parent.identifier, node)) { |
| return null; |
| } |
| if (parent is PropertyAccess && identical(parent.propertyName, node)) { |
| return null; |
| } |
| if (parent is MethodInvocation && |
| identical(parent.methodName, node) && |
| parent.target != null) { |
| return null; |
| } |
| if (parent is ConstructorName) { |
| return null; |
| } |
| if (parent is Label) { |
| return null; |
| } |
| // Prepare VariableElement. |
| Element element = nameScope.lookup(node, definingLibrary); |
| if (element is! VariableElement) { |
| return null; |
| } |
| // Must be local or parameter. |
| ElementKind kind = element.kind; |
| if (kind == ElementKind.LOCAL_VARIABLE) { |
| node.staticElement = element; |
| LocalVariableElementImpl variableImpl = |
| element as LocalVariableElementImpl; |
| if (node.inSetterContext()) { |
| variableImpl.markPotentiallyMutatedInScope(); |
| if (element.enclosingElement != _enclosingFunction) { |
| variableImpl.markPotentiallyMutatedInClosure(); |
| } |
| } |
| } else if (kind == ElementKind.PARAMETER) { |
| node.staticElement = element; |
| if (node.inSetterContext()) { |
| ParameterElementImpl parameterImpl = element as ParameterElementImpl; |
| parameterImpl.markPotentiallyMutatedInScope(); |
| // If we are in some closure, check if it is not the same as where |
| // variable is declared. |
| if (_enclosingFunction != null && |
| (element.enclosingElement != _enclosingFunction)) { |
| parameterImpl.markPotentiallyMutatedInClosure(); |
| } |
| } |
| } |
| return null; |
| } |
| } |
| |
| class _ConstantVerifier_validateInitializerExpression extends ConstantVisitor { |
| final ConstantVerifier verifier; |
| |
| List<ParameterElement> parameterElements; |
| |
| _ConstantVerifier_validateInitializerExpression(TypeProvider arg0, |
| ErrorReporter arg1, this.verifier, this.parameterElements) |
| : super.con1(arg0, arg1); |
| |
| @override |
| DartObjectImpl visitSimpleIdentifier(SimpleIdentifier node) { |
| Element element = node.staticElement; |
| for (ParameterElement parameterElement in parameterElements) { |
| if (identical(parameterElement, element) && parameterElement != null) { |
| DartType type = parameterElement.type; |
| if (type != null) { |
| if (type.isDynamic) { |
| return new DartObjectImpl( |
| verifier._typeProvider.objectType, |
| DynamicState.DYNAMIC_STATE); |
| } else if (type.isSubtypeOf(verifier._boolType)) { |
| return new DartObjectImpl( |
| verifier._typeProvider.boolType, |
| BoolState.UNKNOWN_VALUE); |
| } else if (type.isSubtypeOf(verifier._typeProvider.doubleType)) { |
| return new DartObjectImpl( |
| verifier._typeProvider.doubleType, |
| DoubleState.UNKNOWN_VALUE); |
| } else if (type.isSubtypeOf(verifier._intType)) { |
| return new DartObjectImpl( |
| verifier._typeProvider.intType, |
| IntState.UNKNOWN_VALUE); |
| } else if (type.isSubtypeOf(verifier._numType)) { |
| return new DartObjectImpl( |
| verifier._typeProvider.numType, |
| NumState.UNKNOWN_VALUE); |
| } else if (type.isSubtypeOf(verifier._stringType)) { |
| return new DartObjectImpl( |
| verifier._typeProvider.stringType, |
| StringState.UNKNOWN_VALUE); |
| } |
| // |
| // We don't test for other types of objects (such as List, Map, |
| // Function or Type) because there are no operations allowed on such |
| // types other than '==' and '!=', which means that we don't need to |
| // know the type when there is no specific data about the state of |
| // such objects. |
| // |
| } |
| return new DartObjectImpl( |
| type is InterfaceType ? type : verifier._typeProvider.objectType, |
| GenericState.UNKNOWN_VALUE); |
| } |
| } |
| return super.visitSimpleIdentifier(node); |
| } |
| } |
| |
| class _ElementBuilder_visitClassDeclaration extends UnifyingAstVisitor<Object> { |
| final ElementBuilder builder; |
| |
| List<ClassMember> nonFields; |
| |
| _ElementBuilder_visitClassDeclaration(this.builder, this.nonFields) |
| : super(); |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| nonFields.add(node); |
| return null; |
| } |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| nonFields.add(node); |
| return null; |
| } |
| |
| @override |
| Object visitNode(AstNode node) => node.accept(builder); |
| } |
| |
| class _GatherUsedElementsVisitor extends RecursiveAstVisitor { |
| final _UsedElements usedElements = new _UsedElements(); |
| |
| final LibraryElement _enclosingLibrary; |
| ClassElement _enclosingClass; |
| ExecutableElement _enclosingExec; |
| |
| _GatherUsedElementsVisitor(this._enclosingLibrary); |
| |
| @override |
| visitCatchClause(CatchClause node) { |
| SimpleIdentifier exceptionParameter = node.exceptionParameter; |
| _useStaticElement(exceptionParameter); |
| super.visitCatchClause(node); |
| } |
| |
| @override |
| visitClassDeclaration(ClassDeclaration node) { |
| ClassElement enclosingClassOld = _enclosingClass; |
| try { |
| _enclosingClass = node.element; |
| super.visitClassDeclaration(node); |
| } finally { |
| _enclosingClass = enclosingClassOld; |
| } |
| } |
| |
| @override |
| visitFunctionDeclaration(FunctionDeclaration node) { |
| ExecutableElement enclosingExecOld = _enclosingExec; |
| try { |
| _enclosingExec = node.element; |
| super.visitFunctionDeclaration(node); |
| } finally { |
| _enclosingExec = enclosingExecOld; |
| } |
| } |
| |
| @override |
| visitFunctionExpression(FunctionExpression node) { |
| if (node.parent is! FunctionDeclaration) { |
| _useElement(node.element); |
| } |
| super.visitFunctionExpression(node); |
| } |
| |
| @override |
| visitMethodDeclaration(MethodDeclaration node) { |
| ExecutableElement enclosingExecOld = _enclosingExec; |
| try { |
| _enclosingExec = node.element; |
| super.visitMethodDeclaration(node); |
| } finally { |
| _enclosingExec = enclosingExecOld; |
| } |
| } |
| |
| @override |
| visitSimpleIdentifier(SimpleIdentifier node) { |
| if (node.inDeclarationContext()) { |
| return; |
| } |
| Element element = node.staticElement; |
| bool isIdentifierRead = _isReadIdentifier(node); |
| if (element is LocalVariableElement) { |
| if (isIdentifierRead) { |
| _useElement(element); |
| } |
| // } else if (element is PropertyAccessorElement && |
| // element.isSynthetic && |
| // element.isPrivate) { |
| // PropertyInducingElement variable = element.variable; |
| // if (node.inGetterContext()) { |
| // AstNode parent = node.parent; |
| // if (parent.parent is ExpressionStatement && |
| // (parent is PrefixExpression || |
| // parent is PostfixExpression || |
| // parent is AssignmentExpression && parent.leftHandSide == node)) { |
| // // f++; |
| // // ++f; |
| // // f += 2; |
| // } else { |
| // _useElement(variable); |
| // } |
| // } |
| } else { |
| _useIdentifierElement(node); |
| if (element == null || |
| element is! LocalElement && !identical(element, _enclosingExec)) { |
| usedElements.members.add(node.name); |
| if (isIdentifierRead) { |
| usedElements.readMembers.add(node.name); |
| } |
| } |
| } |
| } |
| |
| @override |
| visitTypeName(TypeName node) { |
| _useIdentifierElement(node.name); |
| } |
| |
| _useElement(Element element) { |
| if (element != null) { |
| usedElements.elements.add(element); |
| } |
| } |
| |
| /** |
| * Marks an [Element] of [node] as used in the library. |
| */ |
| void _useIdentifierElement(Identifier node) { |
| Element element = node.staticElement; |
| if (element == null) { |
| return; |
| } |
| // check if a local element |
| if (!identical(element.library, _enclosingLibrary)) { |
| return; |
| } |
| // ignore references to an element from itself |
| if (identical(element, _enclosingClass)) { |
| return; |
| } |
| if (identical(element, _enclosingExec)) { |
| return; |
| } |
| // ignore places where the element is not actually used |
| if (node.parent is TypeName) { |
| AstNode parent2 = node.parent.parent; |
| if (parent2 is IsExpression) { |
| return; |
| } |
| if (parent2 is VariableDeclarationList) { |
| return; |
| } |
| } |
| // OK |
| _useElement(element); |
| } |
| |
| void _useStaticElement(SimpleIdentifier identifier) { |
| if (identifier != null) { |
| _useElement(identifier.staticElement); |
| } |
| } |
| |
| static bool _isReadIdentifier(SimpleIdentifier node) { |
| // not reading at all |
| if (!node.inGetterContext()) { |
| return false; |
| } |
| // check if useless reading |
| AstNode parent = node.parent; |
| if (parent.parent is ExpressionStatement && |
| (parent is PrefixExpression || |
| parent is PostfixExpression || |
| parent is AssignmentExpression && parent.leftHandSide == node)) { |
| // v++; |
| // ++v; |
| // v += 2; |
| return false; |
| } |
| // OK |
| return true; |
| } |
| } |
| |
| class _ResolverVisitor_isVariableAccessedInClosure extends |
| RecursiveAstVisitor<Object> { |
| final Element variable; |
| |
| bool result = false; |
| |
| bool _inClosure = false; |
| |
| _ResolverVisitor_isVariableAccessedInClosure(this.variable); |
| |
| @override |
| Object visitFunctionExpression(FunctionExpression node) { |
| bool inClosure = this._inClosure; |
| try { |
| this._inClosure = true; |
| return super.visitFunctionExpression(node); |
| } finally { |
| this._inClosure = inClosure; |
| } |
| } |
| |
| @override |
| Object visitSimpleIdentifier(SimpleIdentifier node) { |
| if (result) { |
| return null; |
| } |
| if (_inClosure && identical(node.staticElement, variable)) { |
| result = true; |
| } |
| return null; |
| } |
| } |
| |
| |
| class _ResolverVisitor_isVariablePotentiallyMutatedIn extends |
| RecursiveAstVisitor<Object> { |
| final Element variable; |
| |
| bool result = false; |
| |
| _ResolverVisitor_isVariablePotentiallyMutatedIn(this.variable); |
| |
| @override |
| Object visitSimpleIdentifier(SimpleIdentifier node) { |
| if (result) { |
| return null; |
| } |
| if (identical(node.staticElement, variable)) { |
| if (node.inSetterContext()) { |
| result = true; |
| } |
| } |
| return null; |
| } |
| } |
| |
| |
| class _TypeResolverVisitor_visitClassMembersInScope extends |
| UnifyingAstVisitor<Object> { |
| final TypeResolverVisitor TypeResolverVisitor_this; |
| |
| List<ClassMember> nonFields; |
| |
| _TypeResolverVisitor_visitClassMembersInScope(this.TypeResolverVisitor_this, |
| this.nonFields) |
| : super(); |
| |
| @override |
| Object visitConstructorDeclaration(ConstructorDeclaration node) { |
| nonFields.add(node); |
| return null; |
| } |
| |
| @override |
| Object visitExtendsClause(ExtendsClause node) => null; |
| |
| @override |
| Object visitImplementsClause(ImplementsClause node) => null; |
| |
| @override |
| Object visitMethodDeclaration(MethodDeclaration node) { |
| nonFields.add(node); |
| return null; |
| } |
| |
| @override |
| Object visitNode(AstNode node) => node.accept(TypeResolverVisitor_this); |
| |
| @override |
| Object visitWithClause(WithClause node) => null; |
| } |
| |
| |
| /** |
| * Instances of the class [_UnusedElementsVerifier] traverse an element |
| * structure looking for cases of [HintCode.UNUSED_ELEMENT] and |
| * [HintCode.UNUSED_LOCAL_VARIABLE]. |
| */ |
| class _UnusedElementsVerifier extends RecursiveElementVisitor { |
| /** |
| * The error listener to which errors will be reported. |
| */ |
| final AnalysisErrorListener _errorListener; |
| |
| /** |
| * The elements know to be used. |
| */ |
| final _UsedElements _usedElements; |
| |
| /** |
| * Create a new instance of the [_UnusedElementsVerifier]. |
| */ |
| _UnusedElementsVerifier(this._errorListener, this._usedElements); |
| |
| @override |
| visitClassElement(ClassElement element) { |
| if (!_isUsedElement(element)) { |
| _reportErrorForElement( |
| HintCode.UNUSED_ELEMENT, |
| element, |
| [element.kind.displayName, element.displayName]); |
| } |
| super.visitClassElement(element); |
| } |
| |
| @override |
| visitFieldElement(FieldElement element) { |
| if (!_isReadMember(element)) { |
| _reportErrorForElement( |
| HintCode.UNUSED_FIELD, |
| element, |
| [element.displayName]); |
| } |
| super.visitFieldElement(element); |
| } |
| |
| @override |
| visitFunctionElement(FunctionElement element) { |
| if (!_isUsedElement(element)) { |
| _reportErrorForElement( |
| HintCode.UNUSED_ELEMENT, |
| element, |
| [element.kind.displayName, element.displayName]); |
| } |
| super.visitFunctionElement(element); |
| } |
| |
| @override |
| visitLocalVariableElement(LocalVariableElement element) { |
| if (!_isUsedElement(element)) { |
| _reportErrorForElement( |
| HintCode.UNUSED_LOCAL_VARIABLE, |
| element, |
| [element.displayName]); |
| } |
| } |
| |
| @override |
| visitMethodElement(MethodElement element) { |
| if (!_isUsedMember(element)) { |
| _reportErrorForElement( |
| HintCode.UNUSED_ELEMENT, |
| element, |
| [element.kind.displayName, element.displayName]); |
| } |
| super.visitMethodElement(element); |
| } |
| |
| @override |
| visitPropertyAccessorElement(PropertyAccessorElement element) { |
| if (!_isUsedMember(element)) { |
| _reportErrorForElement( |
| HintCode.UNUSED_ELEMENT, |
| element, |
| [element.kind.displayName, element.displayName]); |
| } |
| super.visitPropertyAccessorElement(element); |
| } |
| |
| bool _isReadMember(Element element) { |
| if (element.isPublic) { |
| return true; |
| } |
| if (element.isSynthetic) { |
| return true; |
| } |
| return _usedElements.readMembers.contains(element.displayName); |
| } |
| |
| bool _isUsedElement(Element element) { |
| if (element.isSynthetic) { |
| return true; |
| } |
| if (element is LocalVariableElement || |
| element is FunctionElement && !element.isStatic) { |
| // local variable or function |
| } else { |
| if (element.isPublic) { |
| return true; |
| } |
| } |
| return _usedElements.elements.contains(element); |
| } |
| |
| bool _isUsedMember(Element element) { |
| if (element.isPublic) { |
| return true; |
| } |
| if (element.isSynthetic) { |
| return true; |
| } |
| if (_usedElements.members.contains(element.displayName)) { |
| return true; |
| } |
| return _usedElements.elements.contains(element); |
| } |
| |
| void _reportErrorForElement(ErrorCode errorCode, Element element, |
| List<Object> arguments) { |
| if (element != null) { |
| _errorListener.onError( |
| new AnalysisError.con2( |
| element.source, |
| element.nameOffset, |
| element.displayName.length, |
| errorCode, |
| arguments)); |
| } |
| } |
| } |
| |
| |
| class _UsedElements { |
| /** |
| * Resolved, locally defined elements that are used or potentially can be |
| * used. |
| */ |
| final HashSet<Element> elements = new HashSet<Element>(); |
| |
| /** |
| * Names of resolved or unresolved class members that are referenced in the |
| * library. |
| */ |
| final HashSet<String> members = new HashSet<String>(); |
| |
| /** |
| * Names of resolved or unresolved class members that are read in the |
| * library. |
| */ |
| final HashSet<String> readMembers = new HashSet<String>(); |
| } |