| // Copyright (c) 2018, 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. |
| |
| part of "kernel_shadow_ast.dart"; |
| |
| class InferenceVistor extends BodyVisitor1<void, DartType> { |
| final ShadowTypeInferrer inferrer; |
| |
| InferenceVistor(this.inferrer); |
| |
| @override |
| void defaultExpression(Expression node, DartType typeContext) { |
| unhandled("${node.runtimeType}", "InferenceVistor", node.fileOffset, |
| inferrer.helper.uri); |
| } |
| |
| @override |
| void defaultStatement(Statement node, DartType _) { |
| unhandled("${node.runtimeType}", "InferenceVistor", node.fileOffset, |
| inferrer.helper.uri); |
| } |
| |
| @override |
| void visitInvalidExpression(InvalidExpression node, DartType typeContext) {} |
| |
| @override |
| void visitIntLiteral(IntLiteral node, DartType typeContext) {} |
| |
| @override |
| void visitDoubleLiteral(DoubleLiteral node, DartType typeContext) {} |
| |
| @override |
| void visitAsExpression(AsExpression node, DartType typeContext) { |
| inferrer.inferExpression( |
| node.operand, const UnknownType(), !inferrer.isTopLevel, |
| isVoidAllowed: true); |
| } |
| |
| void visitAssertInitializerJudgment(AssertInitializerJudgment node) { |
| inferrer.inferStatement(node.judgment); |
| } |
| |
| void visitAssertStatementJudgment(AssertStatementJudgment node) { |
| var conditionJudgment = node.conditionJudgment; |
| var messageJudgment = node.messageJudgment; |
| var expectedType = inferrer.coreTypes.boolClass.rawType; |
| inferrer.inferExpression( |
| conditionJudgment, expectedType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable( |
| expectedType, |
| getInferredType(conditionJudgment, inferrer), |
| conditionJudgment, |
| conditionJudgment.fileOffset); |
| if (messageJudgment != null) { |
| inferrer.inferExpression( |
| messageJudgment, const UnknownType(), !inferrer.isTopLevel); |
| } |
| } |
| |
| @override |
| void visitAwaitExpression(AwaitExpression node, DartType typeContext) { |
| if (!inferrer.typeSchemaEnvironment.isEmptyContext(typeContext)) { |
| typeContext = inferrer.wrapFutureOrType(typeContext); |
| } |
| var operand = node.operand; |
| inferrer.inferExpression(operand, typeContext, true, isVoidAllowed: true); |
| inferrer.storeInferredType( |
| node, |
| inferrer.typeSchemaEnvironment |
| .unfutureType(getInferredType(operand, inferrer))); |
| } |
| |
| void visitBlockJudgment(BlockJudgment node) { |
| for (var judgment in node.judgments) { |
| inferrer.inferStatement(judgment); |
| } |
| } |
| |
| @override |
| void visitBoolLiteral(BoolLiteral node, DartType typeContext) {} |
| |
| void visitBreakJudgment(BreakJudgment node) { |
| // No inference needs to be done. |
| } |
| |
| void visitContinueJudgment(ContinueJudgment node) { |
| // No inference needs to be done. |
| } |
| |
| void visitCascadeJudgment(CascadeJudgment node, DartType typeContext) { |
| node.inferredType = |
| inferrer.inferExpression(node.targetJudgment, typeContext, true); |
| if (inferrer.strongMode) { |
| node.variable.type = getInferredType(node, inferrer); |
| } |
| for (var judgment in node.cascadeJudgments) { |
| inferrer.inferExpression( |
| judgment, const UnknownType(), !inferrer.isTopLevel, |
| isVoidAllowed: true); |
| } |
| return null; |
| } |
| |
| @override |
| void visitConditionalExpression( |
| ConditionalExpression node, DartType typeContext) { |
| var condition = node.condition; |
| var then = node.then; |
| var otherwise = node.otherwise; |
| var expectedType = inferrer.coreTypes.boolClass.rawType; |
| inferrer.inferExpression(condition, expectedType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable( |
| expectedType, |
| getInferredType(condition, inferrer), |
| node.condition, |
| node.condition.fileOffset); |
| inferrer.inferExpression(then, typeContext, true, isVoidAllowed: true); |
| inferrer.inferExpression(otherwise, typeContext, true, isVoidAllowed: true); |
| DartType inferredType = inferrer.typeSchemaEnvironment |
| .getStandardUpperBound(getInferredType(then, inferrer), |
| getInferredType(otherwise, inferrer)); |
| if (inferrer.strongMode) { |
| node.staticType = inferredType; |
| } |
| } |
| |
| @override |
| void visitConstructorInvocation( |
| ConstructorInvocation node, DartType typeContext) { |
| var library = inferrer.engine.beingInferred[node.target]; |
| if (library != null) { |
| // There is a cyclic dependency where inferring the types of the |
| // initializing formals of a constructor required us to infer the |
| // corresponding field type which required us to know the type of the |
| // constructor. |
| String name = node.target.enclosingClass.name; |
| if (node.target.name.name.isNotEmpty) { |
| // TODO(ahe): Use `inferrer.helper.constructorNameForDiagnostics` |
| // instead. However, `inferrer.helper` may be null. |
| name += ".${node.target.name.name}"; |
| } |
| library.addProblem( |
| templateCantInferTypeDueToCircularity.withArguments(name), |
| node.target.fileOffset, |
| name.length, |
| node.target.fileUri); |
| for (var declaration in node.target.function.positionalParameters) { |
| declaration.type ??= const DynamicType(); |
| } |
| for (var declaration in node.target.function.namedParameters) { |
| declaration.type ??= const DynamicType(); |
| } |
| } else if ((library = inferrer.engine.toBeInferred[node.target]) != null) { |
| inferrer.engine.toBeInferred.remove(node.target); |
| inferrer.engine.beingInferred[node.target] = library; |
| for (var declaration in node.target.function.positionalParameters) { |
| inferrer.engine.inferInitializingFormal(declaration, node.target); |
| } |
| for (var declaration in node.target.function.namedParameters) { |
| inferrer.engine.inferInitializingFormal(declaration, node.target); |
| } |
| inferrer.engine.beingInferred.remove(node.target); |
| } |
| bool hasExplicitTypeArguments = |
| getExplicitTypeArguments(node.arguments) != null; |
| var inferenceResult = inferrer.inferInvocation( |
| typeContext, |
| node.fileOffset, |
| node.target.function.functionType, |
| computeConstructorReturnType(node.target), |
| node.arguments, |
| isConst: node.isConst); |
| inferrer.storeInferredType(node, inferenceResult.type); |
| KernelLibraryBuilder inferrerLibrary = inferrer.library; |
| if (!hasExplicitTypeArguments && inferrerLibrary is KernelLibraryBuilder) { |
| inferrerLibrary.checkBoundsInConstructorInvocation( |
| node, inferrer.typeSchemaEnvironment, |
| inferred: true); |
| } |
| } |
| |
| void visitContinueSwitchJudgment(ContinueSwitchJudgment node) { |
| // No inference needs to be done. |
| } |
| void visitDeferredCheckJudgment( |
| DeferredCheckJudgment node, DartType typeContext) { |
| // Since the variable is not used in the body we don't need to type infer |
| // it. We can just type infer the body. |
| var judgment = node.judgment; |
| inferrer.inferExpression(judgment, typeContext, true, isVoidAllowed: true); |
| node.inferredType = getInferredType(judgment, inferrer); |
| return null; |
| } |
| |
| void visitDoJudgment(DoJudgment node) { |
| var conditionJudgment = node.conditionJudgment; |
| inferrer.inferStatement(node.bodyJudgment); |
| var boolType = inferrer.coreTypes.boolClass.rawType; |
| inferrer.inferExpression(conditionJudgment, boolType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable( |
| boolType, |
| getInferredType(conditionJudgment, inferrer), |
| node.condition, |
| node.condition.fileOffset); |
| } |
| |
| void visitDoubleJudgment(DoubleJudgment node, DartType typeContext) { |
| node.inferredType = inferrer.coreTypes.doubleClass.rawType; |
| return null; |
| } |
| |
| void visitEmptyStatementJudgment(EmptyStatementJudgment node) { |
| // No inference needs to be done. |
| } |
| void visitExpressionStatementJudgment(ExpressionStatementJudgment node) { |
| inferrer.inferExpression( |
| node.judgment, const UnknownType(), !inferrer.isTopLevel, |
| isVoidAllowed: true); |
| } |
| |
| void visitFactoryConstructorInvocationJudgment( |
| FactoryConstructorInvocationJudgment node, DartType typeContext) { |
| bool hadExplicitTypeArguments = |
| getExplicitTypeArguments(node.arguments) != null; |
| var inferenceResult = inferrer.inferInvocation( |
| typeContext, |
| node.fileOffset, |
| node.target.function.functionType, |
| computeConstructorReturnType(node.target), |
| node.argumentJudgments, |
| isConst: node.isConst); |
| node.inferredType = inferenceResult.type; |
| KernelLibraryBuilder inferrerLibrary = inferrer.library; |
| if (!hadExplicitTypeArguments && inferrerLibrary is KernelLibraryBuilder) { |
| inferrerLibrary.checkBoundsInFactoryInvocation( |
| node, inferrer.typeSchemaEnvironment, |
| inferred: true); |
| } |
| return null; |
| } |
| |
| void visitShadowFieldInitializer(ShadowFieldInitializer node) { |
| var initializerType = |
| inferrer.inferExpression(node.value, node.field.type, true); |
| inferrer.ensureAssignable( |
| node.field.type, initializerType, node.value, node.fileOffset); |
| } |
| |
| void visitForInJudgment(ForInJudgment node) { |
| var iterableClass = node.isAsync |
| ? inferrer.coreTypes.streamClass |
| : inferrer.coreTypes.iterableClass; |
| DartType context; |
| bool typeNeeded = false; |
| bool typeChecksNeeded = !inferrer.isTopLevel; |
| VariableDeclarationJudgment variable; |
| var syntheticAssignment = node._syntheticAssignment; |
| DartType syntheticWriteType; |
| if (node._declaresVariable) { |
| variable = node.variableJudgment; |
| if (inferrer.strongMode && variable._implicitlyTyped) { |
| typeNeeded = true; |
| context = const UnknownType(); |
| } else { |
| context = variable.type; |
| } |
| } else if (syntheticAssignment is ComplexAssignmentJudgment) { |
| syntheticWriteType = |
| context = syntheticAssignment._getWriteType(inferrer); |
| } else { |
| context = const UnknownType(); |
| } |
| context = inferrer.wrapType(context, iterableClass); |
| |
| var iterableJudgment = node.iterableJudgment; |
| inferrer.inferExpression( |
| iterableJudgment, context, typeNeeded || typeChecksNeeded); |
| var inferredExpressionType = inferrer |
| .resolveTypeParameter(getInferredType(iterableJudgment, inferrer)); |
| inferrer.ensureAssignable( |
| inferrer.wrapType(const DynamicType(), iterableClass), |
| inferredExpressionType, |
| node.iterable, |
| node.iterable.fileOffset, |
| template: templateForInLoopTypeNotIterable); |
| |
| DartType inferredType; |
| if (typeNeeded || typeChecksNeeded) { |
| inferredType = const DynamicType(); |
| if (inferredExpressionType is InterfaceType) { |
| InterfaceType supertype = inferrer.classHierarchy |
| .getTypeAsInstanceOf(inferredExpressionType, iterableClass); |
| if (supertype != null) { |
| inferredType = supertype.typeArguments[0]; |
| } |
| } |
| if (typeNeeded) { |
| inferrer.instrumentation?.record(inferrer.uri, variable.fileOffset, |
| 'type', new InstrumentationValueForType(inferredType)); |
| variable.type = inferredType; |
| } |
| if (!node._declaresVariable) { |
| node.variable.type = inferredType; |
| } |
| } |
| |
| inferrer.inferStatement(node.bodyJudgment); |
| if (syntheticAssignment != null) { |
| var syntheticStatement = new ExpressionStatement(syntheticAssignment); |
| node.body = combineStatements(syntheticStatement, node.body) |
| ..parent = node; |
| } |
| if (node._declaresVariable) { |
| inferrer.inferMetadataKeepingHelper(variable.annotations); |
| var tempVar = |
| new VariableDeclaration(null, type: inferredType, isFinal: true); |
| var variableGet = new VariableGet(tempVar) |
| ..fileOffset = node.variable.fileOffset; |
| var implicitDowncast = inferrer.ensureAssignable( |
| variable.type, inferredType, variableGet, node.fileOffset, |
| template: templateForInLoopElementTypeNotAssignable); |
| if (implicitDowncast != null) { |
| node.variable = tempVar..parent = node; |
| variable.initializer = implicitDowncast..parent = variable; |
| node.body = combineStatements(variable, node.body)..parent = node; |
| } |
| } else if (syntheticAssignment is SyntheticExpressionJudgment) { |
| if (syntheticAssignment is ComplexAssignmentJudgment) { |
| inferrer.ensureAssignable( |
| greatestClosure(inferrer.coreTypes, syntheticWriteType), |
| node.variable.type, |
| syntheticAssignment.rhs, |
| syntheticAssignment.rhs.fileOffset, |
| template: templateForInLoopElementTypeNotAssignable, |
| isVoidAllowed: true); |
| if (syntheticAssignment is PropertyAssignmentJudgment) { |
| syntheticAssignment._handleWriteContravariance( |
| inferrer, inferrer.thisType); |
| } |
| } |
| syntheticAssignment._replaceWithDesugared(); |
| } |
| } |
| |
| void visitForJudgment(ForJudgment node) { |
| var initializers = node.initializers; |
| var conditionJudgment = node.conditionJudgment; |
| if (initializers != null) { |
| for (var initializer in initializers) { |
| node.variables |
| .add(new VariableDeclaration.forValue(initializer)..parent = node); |
| inferrer.inferExpression( |
| initializer, const UnknownType(), !inferrer.isTopLevel, |
| isVoidAllowed: true); |
| } |
| } else { |
| for (var variable in node.variableJudgments) { |
| inferrer.inferStatement(variable); |
| } |
| } |
| if (conditionJudgment != null) { |
| var expectedType = inferrer.coreTypes.boolClass.rawType; |
| inferrer.inferExpression( |
| conditionJudgment, expectedType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable( |
| expectedType, |
| getInferredType(conditionJudgment, inferrer), |
| node.condition, |
| node.condition.fileOffset); |
| } |
| for (var update in node.updateJudgments) { |
| inferrer.inferExpression( |
| update, const UnknownType(), !inferrer.isTopLevel, |
| isVoidAllowed: true); |
| } |
| inferrer.inferStatement(node.bodyJudgment); |
| } |
| |
| ExpressionInferenceResult visitFunctionNodeJudgment( |
| FunctionNodeJudgment node, |
| DartType typeContext, |
| DartType returnContext, |
| int returnTypeInstrumentationOffset) { |
| return inferrer.inferLocalFunction( |
| node, typeContext, returnTypeInstrumentationOffset, returnContext); |
| } |
| |
| void visitFunctionDeclarationJudgment(FunctionDeclarationJudgment node) { |
| inferrer.inferMetadataKeepingHelper(node.variable.annotations); |
| DartType returnContext = node._hasImplicitReturnType |
| ? (inferrer.strongMode ? null : const DynamicType()) |
| : node.function.returnType; |
| var inferenceResult = visitFunctionNodeJudgment( |
| node.functionJudgment, null, returnContext, node.fileOffset); |
| node.variable.type = inferenceResult.type; |
| } |
| |
| @override |
| void visitFunctionExpression(FunctionExpression node, DartType typeContext) { |
| var inferenceResult = visitFunctionNodeJudgment( |
| node.function, typeContext, null, node.fileOffset); |
| inferrer.storeInferredType(node, inferenceResult.type); |
| } |
| |
| void visitInvalidSuperInitializerJudgment( |
| InvalidSuperInitializerJudgment node) { |
| var substitution = Substitution.fromSupertype(inferrer.classHierarchy |
| .getClassAsInstanceOf( |
| inferrer.thisType.classNode, node.target.enclosingClass)); |
| inferrer.inferInvocation( |
| null, |
| node.fileOffset, |
| substitution.substituteType( |
| node.target.function.functionType.withoutTypeParameters), |
| inferrer.thisType, |
| node.argumentsJudgment, |
| skipTypeArgumentInference: true); |
| } |
| |
| void visitIfNullJudgment(IfNullJudgment node, DartType typeContext) { |
| var leftJudgment = node.leftJudgment; |
| var rightJudgment = node.rightJudgment; |
| // To infer `e0 ?? e1` in context K: |
| // - Infer e0 in context K to get T0 |
| inferrer.inferExpression(leftJudgment, typeContext, true); |
| var lhsType = getInferredType(leftJudgment, inferrer); |
| if (inferrer.strongMode) { |
| node.variable.type = lhsType; |
| } |
| // - Let J = T0 if K is `?` else K. |
| // - Infer e1 in context J to get T1 |
| if (typeContext is UnknownType) { |
| inferrer.inferExpression(rightJudgment, lhsType, true, |
| isVoidAllowed: true); |
| } else { |
| inferrer.inferExpression(rightJudgment, typeContext, true, |
| isVoidAllowed: true); |
| } |
| var rhsType = getInferredType(rightJudgment, inferrer); |
| // - Let T = greatest closure of K with respect to `?` if K is not `_`, else |
| // UP(t0, t1) |
| // - Then the inferred type is T. |
| node.inferredType = |
| inferrer.typeSchemaEnvironment.getStandardUpperBound(lhsType, rhsType); |
| if (inferrer.strongMode) { |
| node.body.staticType = getInferredType(node, inferrer); |
| } |
| return null; |
| } |
| |
| void visitIfJudgment(IfJudgment node) { |
| var conditionJudgment = node.conditionJudgment; |
| var expectedType = inferrer.coreTypes.boolClass.rawType; |
| inferrer.inferExpression( |
| conditionJudgment, expectedType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable( |
| expectedType, |
| getInferredType(conditionJudgment, inferrer), |
| node.condition, |
| node.condition.fileOffset); |
| inferrer.inferStatement(node.thenJudgment); |
| if (node.otherwiseJudgment != null) { |
| inferrer.inferStatement(node.otherwiseJudgment); |
| } |
| } |
| |
| void visitIllegalAssignmentJudgment( |
| IllegalAssignmentJudgment node, DartType typeContext) { |
| if (node.write != null) { |
| inferrer.inferExpression( |
| node.write, const UnknownType(), !inferrer.isTopLevel); |
| } |
| inferrer.inferExpression( |
| node.rhs, const UnknownType(), !inferrer.isTopLevel); |
| node._replaceWithDesugared(); |
| node.inferredType = const DynamicType(); |
| return null; |
| } |
| |
| void visitIndexAssignmentJudgment( |
| IndexAssignmentJudgment node, DartType typeContext) { |
| var receiverType = node._inferReceiver(inferrer); |
| var writeMember = |
| inferrer.findMethodInvocationMember(receiverType, node.write); |
| // To replicate analyzer behavior, we base type inference on the write |
| // member. TODO(paulberry): would it be better to use the read member |
| // when doing compound assignment? |
| var calleeType = inferrer.getCalleeFunctionType( |
| inferrer.getCalleeType(writeMember, receiverType), false); |
| DartType expectedIndexTypeForWrite; |
| DartType indexContext = const UnknownType(); |
| DartType writeContext = const UnknownType(); |
| if (calleeType.positionalParameters.length >= 2) { |
| // TODO(paulberry): we ought to get a context for the index expression |
| // from the index formal parameter, but analyzer doesn't so for now we |
| // replicate its behavior. |
| expectedIndexTypeForWrite = calleeType.positionalParameters[0]; |
| writeContext = calleeType.positionalParameters[1]; |
| } |
| inferrer.inferExpression(node.index, indexContext, true); |
| var indexType = getInferredType(node.index, inferrer); |
| node._storeLetType(inferrer, node.index, indexType); |
| if (writeContext is! UnknownType) { |
| inferrer.ensureAssignable( |
| expectedIndexTypeForWrite, |
| indexType, |
| node._getInvocationArguments(inferrer, node.write).positional[0], |
| node.write.fileOffset); |
| } |
| InvocationExpression read = node.read; |
| DartType readType; |
| if (read != null) { |
| var readMember = inferrer.findMethodInvocationMember(receiverType, read, |
| instrumented: false); |
| var calleeFunctionType = inferrer.getCalleeFunctionType( |
| inferrer.getCalleeType(readMember, receiverType), false); |
| inferrer.ensureAssignable( |
| getPositionalParameterType(calleeFunctionType, 0), |
| indexType, |
| node._getInvocationArguments(inferrer, read).positional[0], |
| read.fileOffset); |
| readType = calleeFunctionType.returnType; |
| var desugaredInvocation = read is MethodInvocation ? read : null; |
| var checkKind = inferrer.preCheckInvocationContravariance(node.receiver, |
| receiverType, readMember, desugaredInvocation, read.arguments, read); |
| var replacedRead = inferrer.handleInvocationContravariance( |
| checkKind, |
| desugaredInvocation, |
| read.arguments, |
| read, |
| readType, |
| calleeFunctionType, |
| read.fileOffset); |
| node._storeLetType(inferrer, replacedRead, readType); |
| } |
| node._inferRhs(inferrer, readType, writeContext); |
| node._replaceWithDesugared(); |
| return null; |
| } |
| |
| void visitIntJudgment(IntJudgment node, DartType typeContext) { |
| if (inferrer.isDoubleContext(typeContext)) { |
| double doubleValue = node.asDouble(); |
| if (doubleValue != null) { |
| node.parent.replaceChild( |
| node, DoubleLiteral(doubleValue)..fileOffset = node.fileOffset); |
| node.inferredType = inferrer.coreTypes.doubleClass.rawType; |
| return null; |
| } |
| } |
| Expression error = checkWebIntLiteralsErrorIfUnexact( |
| inferrer, node.value, node.literal, node.fileOffset); |
| if (error != null) { |
| node.parent.replaceChild(node, error); |
| node.inferredType = const BottomType(); |
| return null; |
| } |
| node.inferredType = inferrer.coreTypes.intClass.rawType; |
| return null; |
| } |
| |
| void visitShadowLargeIntLiteral( |
| ShadowLargeIntLiteral node, DartType typeContext) { |
| if (inferrer.isDoubleContext(typeContext)) { |
| double doubleValue = node.asDouble(); |
| if (doubleValue != null) { |
| node.parent.replaceChild( |
| node, DoubleLiteral(doubleValue)..fileOffset = node.fileOffset); |
| node.inferredType = inferrer.coreTypes.doubleClass.rawType; |
| return null; |
| } |
| } |
| |
| int intValue = node.asInt64(); |
| if (intValue == null) { |
| Expression replacement = inferrer.helper |
| .buildProblem( |
| templateIntegerLiteralIsOutOfRange.withArguments(node.literal), |
| node.fileOffset, |
| node.literal.length) |
| .desugared; |
| node.parent.replaceChild(node, replacement); |
| node.inferredType = const BottomType(); |
| return null; |
| } |
| Expression error = checkWebIntLiteralsErrorIfUnexact( |
| inferrer, intValue, node.literal, node.fileOffset); |
| if (error != null) { |
| node.parent.replaceChild(node, error); |
| node.inferredType = const BottomType(); |
| return null; |
| } |
| node.parent |
| .replaceChild(node, IntLiteral(intValue)..fileOffset = node.fileOffset); |
| node.inferredType = inferrer.coreTypes.intClass.rawType; |
| return null; |
| } |
| |
| void visitShadowInvalidInitializer(ShadowInvalidInitializer node) { |
| inferrer.inferExpression( |
| node.variable.initializer, const UnknownType(), !inferrer.isTopLevel); |
| } |
| |
| void visitShadowInvalidFieldInitializer(ShadowInvalidFieldInitializer node) { |
| inferrer.inferExpression(node.value, node.field.type, !inferrer.isTopLevel); |
| } |
| |
| @override |
| void visitIsExpression(IsExpression node, DartType typeContext) { |
| inferrer.inferExpression( |
| node.operand, const UnknownType(), !inferrer.isTopLevel); |
| } |
| |
| void visitLabeledStatementJudgment(LabeledStatementJudgment node) { |
| inferrer.inferStatement(node.judgment); |
| } |
| |
| void visitListLiteralJudgment( |
| ListLiteralJudgment node, DartType typeContext) { |
| var listClass = inferrer.coreTypes.listClass; |
| var listType = listClass.thisType; |
| List<DartType> inferredTypes; |
| DartType inferredTypeArgument; |
| List<DartType> formalTypes; |
| List<DartType> actualTypes; |
| bool inferenceNeeded = |
| node._declaredTypeArgument == null && inferrer.strongMode; |
| bool typeChecksNeeded = !inferrer.isTopLevel; |
| if (inferenceNeeded || typeChecksNeeded) { |
| formalTypes = []; |
| actualTypes = []; |
| } |
| if (inferenceNeeded) { |
| inferredTypes = [const UnknownType()]; |
| inferrer.typeSchemaEnvironment.inferGenericFunctionOrType(listType, |
| listClass.typeParameters, null, null, typeContext, inferredTypes, |
| isConst: node.isConst); |
| inferredTypeArgument = inferredTypes[0]; |
| } else { |
| inferredTypeArgument = node._declaredTypeArgument ?? const DynamicType(); |
| } |
| if (inferenceNeeded || typeChecksNeeded) { |
| for (int i = 0; i < node.judgments.length; ++i) { |
| Expression judgment = node.judgments[i]; |
| inferrer.inferExpression( |
| judgment, inferredTypeArgument, inferenceNeeded || typeChecksNeeded, |
| isVoidAllowed: true); |
| if (inferenceNeeded) { |
| formalTypes.add(listType.typeArguments[0]); |
| } |
| actualTypes.add(getInferredType(judgment, inferrer)); |
| } |
| } |
| if (inferenceNeeded) { |
| inferrer.typeSchemaEnvironment.inferGenericFunctionOrType( |
| listType, |
| listClass.typeParameters, |
| formalTypes, |
| actualTypes, |
| typeContext, |
| inferredTypes); |
| inferredTypeArgument = inferredTypes[0]; |
| inferrer.instrumentation?.record( |
| inferrer.uri, |
| node.fileOffset, |
| 'typeArgs', |
| new InstrumentationValueForTypeArgs([inferredTypeArgument])); |
| node.typeArgument = inferredTypeArgument; |
| } |
| if (typeChecksNeeded) { |
| for (int i = 0; i < node.judgments.length; i++) { |
| inferrer.ensureAssignable(node.typeArgument, actualTypes[i], |
| node.judgments[i], node.judgments[i].fileOffset, |
| isVoidAllowed: node.typeArgument is VoidType); |
| } |
| } |
| node.inferredType = new InterfaceType(listClass, [inferredTypeArgument]); |
| KernelLibraryBuilder inferrerLibrary = inferrer.library; |
| if (node._declaredTypeArgument == null && |
| inferrerLibrary is KernelLibraryBuilder) { |
| inferrerLibrary.checkBoundsInListLiteral( |
| node, inferrer.typeSchemaEnvironment, |
| inferred: true); |
| } |
| return null; |
| } |
| |
| @override |
| void visitLogicalExpression(LogicalExpression node, DartType typeContext) { |
| var boolType = inferrer.coreTypes.boolClass.rawType; |
| var left = node.left; |
| var right = node.right; |
| inferrer.inferExpression(left, boolType, !inferrer.isTopLevel); |
| inferrer.inferExpression(right, boolType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable(boolType, getInferredType(left, inferrer), |
| node.left, node.left.fileOffset); |
| inferrer.ensureAssignable(boolType, getInferredType(right, inferrer), |
| node.right, node.right.fileOffset); |
| return null; |
| } |
| |
| void visitMapEntryJudgment(MapEntryJudgment node, DartType keyTypeContext, |
| DartType valueTypeContext) { |
| Expression keyJudgment = node.keyJudgment; |
| inferrer.inferExpression(keyJudgment, keyTypeContext, true, |
| isVoidAllowed: true); |
| node.inferredKeyType = getInferredType(keyJudgment, inferrer); |
| |
| Expression valueJudgment = node.valueJudgment; |
| inferrer.inferExpression(valueJudgment, valueTypeContext, true, |
| isVoidAllowed: true); |
| node.inferredValueType = getInferredType(valueJudgment, inferrer); |
| |
| return null; |
| } |
| |
| void visitMapLiteralJudgment(MapLiteralJudgment node, DartType typeContext) { |
| var mapClass = inferrer.coreTypes.mapClass; |
| var mapType = mapClass.thisType; |
| List<DartType> inferredTypes; |
| DartType inferredKeyType; |
| DartType inferredValueType; |
| List<DartType> formalTypes; |
| List<DartType> actualTypes; |
| assert( |
| (node._declaredKeyType == null) == (node._declaredValueType == null)); |
| bool inferenceNeeded = node._declaredKeyType == null && inferrer.strongMode; |
| bool typeChecksNeeded = !inferrer.isTopLevel; |
| if (inferenceNeeded || typeChecksNeeded) { |
| formalTypes = []; |
| actualTypes = []; |
| } |
| if (inferenceNeeded) { |
| inferredTypes = [const UnknownType(), const UnknownType()]; |
| inferrer.typeSchemaEnvironment.inferGenericFunctionOrType(mapType, |
| mapClass.typeParameters, null, null, typeContext, inferredTypes, |
| isConst: node.isConst); |
| inferredKeyType = inferredTypes[0]; |
| inferredValueType = inferredTypes[1]; |
| } else { |
| inferredKeyType = node._declaredKeyType ?? const DynamicType(); |
| inferredValueType = node._declaredValueType ?? const DynamicType(); |
| } |
| List<Expression> cachedKeyJudgments = |
| node.judgments.map((j) => (j as MapEntryJudgment).keyJudgment).toList(); |
| List<Expression> cachedValueJudgments = node.judgments |
| .map((j) => (j as MapEntryJudgment).valueJudgment) |
| .toList(); |
| if (inferenceNeeded || typeChecksNeeded) { |
| for (MapEntryJudgment judgment in node.judgments) { |
| visitMapEntryJudgment(judgment, inferredKeyType, inferredValueType); |
| if (inferenceNeeded) { |
| formalTypes.addAll(mapType.typeArguments); |
| } |
| actualTypes.add(judgment.inferredKeyType); |
| actualTypes.add(judgment.inferredValueType); |
| } |
| } |
| if (inferenceNeeded) { |
| inferrer.typeSchemaEnvironment.inferGenericFunctionOrType( |
| mapType, |
| mapClass.typeParameters, |
| formalTypes, |
| actualTypes, |
| typeContext, |
| inferredTypes); |
| inferredKeyType = inferredTypes[0]; |
| inferredValueType = inferredTypes[1]; |
| inferrer.instrumentation?.record( |
| inferrer.uri, |
| node.fileOffset, |
| 'typeArgs', |
| new InstrumentationValueForTypeArgs( |
| [inferredKeyType, inferredValueType])); |
| node.keyType = inferredKeyType; |
| node.valueType = inferredValueType; |
| } |
| if (typeChecksNeeded) { |
| for (int i = 0; i < node.judgments.length; ++i) { |
| Expression keyJudgment = cachedKeyJudgments[i]; |
| inferrer.ensureAssignable(node.keyType, actualTypes[2 * i], keyJudgment, |
| keyJudgment.fileOffset, |
| isVoidAllowed: node.keyType is VoidType); |
| |
| Expression valueJudgment = cachedValueJudgments[i]; |
| inferrer.ensureAssignable(node.valueType, actualTypes[2 * i + 1], |
| valueJudgment, valueJudgment.fileOffset, |
| isVoidAllowed: node.valueType is VoidType); |
| } |
| } |
| node.inferredType = |
| new InterfaceType(mapClass, [inferredKeyType, inferredValueType]); |
| KernelLibraryBuilder inferrerLibrary = inferrer.library; |
| // Either both [_declaredKeyType] and [_declaredValueType] are omitted or |
| // none of them, so we may just check one. |
| if (node._declaredKeyType == null && |
| inferrerLibrary is KernelLibraryBuilder) { |
| inferrerLibrary.checkBoundsInMapLiteral( |
| node, inferrer.typeSchemaEnvironment, |
| inferred: true); |
| } |
| return null; |
| } |
| |
| void visitMethodInvocationJudgment( |
| MethodInvocationJudgment node, DartType typeContext) { |
| if (node.name.name == 'unary-' && |
| node.arguments.types.isEmpty && |
| node.arguments.positional.isEmpty && |
| node.arguments.named.isEmpty) { |
| // Replace integer literals in a double context with the corresponding |
| // double literal if it's exact. For double literals, the negation is |
| // folded away. In any non-double context, or if there is no exact |
| // double value, then the corresponding integer literal is left. The |
| // negation is not folded away so that platforms with web literals can |
| // distinguish between (non-negated) 0x8000000000000000 represented as |
| // integer literal -9223372036854775808 which should be a positive number, |
| // and negated 9223372036854775808 represented as |
| // -9223372036854775808.unary-() which should be a negative number. |
| if (node.receiver is IntJudgment) { |
| IntJudgment receiver = node.receiver; |
| if (inferrer.isDoubleContext(typeContext)) { |
| double doubleValue = receiver.asDouble(negated: true); |
| if (doubleValue != null) { |
| node.parent.replaceChild( |
| node, DoubleLiteral(doubleValue)..fileOffset = node.fileOffset); |
| node.inferredType = inferrer.coreTypes.doubleClass.rawType; |
| return null; |
| } |
| } |
| Expression error = checkWebIntLiteralsErrorIfUnexact( |
| inferrer, receiver.value, receiver.literal, receiver.fileOffset); |
| if (error != null) { |
| node.parent.replaceChild(node, error); |
| node.inferredType = const BottomType(); |
| return null; |
| } |
| } else if (node.receiver is ShadowLargeIntLiteral) { |
| ShadowLargeIntLiteral receiver = node.receiver; |
| if (!receiver.isParenthesized) { |
| if (inferrer.isDoubleContext(typeContext)) { |
| double doubleValue = receiver.asDouble(negated: true); |
| if (doubleValue != null) { |
| node.parent.replaceChild(node, |
| DoubleLiteral(doubleValue)..fileOffset = node.fileOffset); |
| node.inferredType = inferrer.coreTypes.doubleClass.rawType; |
| return null; |
| } |
| } |
| int intValue = receiver.asInt64(negated: true); |
| if (intValue == null) { |
| Expression error = inferrer.helper |
| .buildProblem( |
| templateIntegerLiteralIsOutOfRange |
| .withArguments(receiver.literal), |
| receiver.fileOffset, |
| receiver.literal.length) |
| .desugared; |
| node.parent.replaceChild(node, error); |
| node.inferredType = const BottomType(); |
| return null; |
| } |
| if (intValue != null) { |
| Expression error = checkWebIntLiteralsErrorIfUnexact( |
| inferrer, intValue, receiver.literal, receiver.fileOffset); |
| if (error != null) { |
| node.parent.replaceChild(node, error); |
| node.inferredType = const BottomType(); |
| return null; |
| } |
| node.receiver = IntLiteral(-intValue) |
| ..fileOffset = node.receiver.fileOffset |
| ..parent = node; |
| } |
| } |
| } |
| } |
| var inferenceResult = inferrer.inferMethodInvocation( |
| node, node.receiver, node.fileOffset, node._isImplicitCall, typeContext, |
| desugaredInvocation: node); |
| node.inferredType = inferenceResult.type; |
| } |
| |
| void visitNamedFunctionExpressionJudgment( |
| NamedFunctionExpressionJudgment node, DartType typeContext) { |
| Expression initializer = node.variableJudgment.initializer; |
| inferrer.inferExpression(initializer, typeContext, true); |
| node.inferredType = getInferredType(initializer, inferrer); |
| if (inferrer.strongMode) node.variable.type = node.inferredType; |
| return null; |
| } |
| |
| @override |
| void visitNot(Not node, DartType typeContext) { |
| var operand = node.operand; |
| var boolType = inferrer.coreTypes.boolClass.rawType; |
| inferrer.inferExpression(operand, boolType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable(boolType, getInferredType(operand, inferrer), |
| node.operand, node.fileOffset); |
| } |
| |
| void visitNullAwareMethodInvocationJudgment( |
| NullAwareMethodInvocationJudgment node, DartType typeContext) { |
| var inferenceResult = inferrer.inferMethodInvocation( |
| node, node.variable.initializer, node.fileOffset, false, typeContext, |
| receiverVariable: node.variable, |
| desugaredInvocation: node._desugaredInvocation); |
| node.inferredType = inferenceResult.type; |
| if (inferrer.strongMode) { |
| node.body.staticType = node.inferredType; |
| } |
| return null; |
| } |
| |
| void visitNullAwarePropertyGetJudgment( |
| NullAwarePropertyGetJudgment node, DartType typeContext) { |
| inferrer.inferPropertyGet( |
| node, node.receiverJudgment, node.fileOffset, typeContext, |
| receiverVariable: node.variable, desugaredGet: node._desugaredGet); |
| if (inferrer.strongMode) { |
| node.body.staticType = node.inferredType; |
| } |
| return null; |
| } |
| |
| @override |
| void visitNullLiteral(NullLiteral node, DartType typeContext) {} |
| |
| @override |
| void visitLet(Let node, DartType typeContext) { |
| DartType variableType = node.variable.type; |
| if (variableType == const DynamicType()) { |
| return defaultExpression(node, typeContext); |
| } |
| Expression initializer = node.variable.initializer; |
| inferrer.inferExpression(initializer, variableType, true, |
| isVoidAllowed: true); |
| Expression body = node.body; |
| inferrer.inferExpression(body, typeContext, true, isVoidAllowed: true); |
| // TODO(ahe): This shouldn't be needed. See InferredTypeVisitor.visitLet. |
| inferrer.storeInferredType(node, getInferredType(body, inferrer)); |
| } |
| |
| void visitPropertyAssignmentJudgment( |
| PropertyAssignmentJudgment node, DartType typeContext) { |
| var receiverType = node._inferReceiver(inferrer); |
| |
| DartType readType; |
| if (node.read != null) { |
| var readMember = inferrer.findPropertyGetMember(receiverType, node.read, |
| instrumented: false); |
| readType = inferrer.getCalleeType(readMember, receiverType); |
| inferrer.handlePropertyGetContravariance( |
| node.receiver, |
| readMember, |
| node.read is PropertyGet ? node.read : null, |
| node.read, |
| readType, |
| node.read.fileOffset); |
| node._storeLetType(inferrer, node.read, readType); |
| } |
| Member writeMember; |
| if (node.write != null) { |
| writeMember = node._handleWriteContravariance(inferrer, receiverType); |
| } |
| // To replicate analyzer behavior, we base type inference on the write |
| // member. TODO(paulberry): would it be better to use the read member when |
| // doing compound assignment? |
| var writeContext = inferrer.getSetterType(writeMember, receiverType); |
| node._inferRhs(inferrer, readType, writeContext); |
| if (inferrer.strongMode) |
| node.nullAwareGuard?.staticType = node.inferredType; |
| node._replaceWithDesugared(); |
| return null; |
| } |
| |
| @override |
| void visitPropertyGet(PropertyGet node, DartType typeContext) { |
| inferrer.inferPropertyGet(node, node.receiver, node.fileOffset, typeContext, |
| desugaredGet: node); |
| } |
| |
| void visitRedirectingInitializerJudgment( |
| RedirectingInitializerJudgment node) { |
| List<TypeParameter> classTypeParameters = |
| node.target.enclosingClass.typeParameters; |
| List<DartType> typeArguments = |
| new List<DartType>(classTypeParameters.length); |
| for (int i = 0; i < typeArguments.length; i++) { |
| typeArguments[i] = new TypeParameterType(classTypeParameters[i]); |
| } |
| ArgumentsJudgment.setNonInferrableArgumentTypes( |
| node.arguments, typeArguments); |
| inferrer.inferInvocation( |
| null, |
| node.fileOffset, |
| node.target.function.functionType, |
| node.target.enclosingClass.thisType, |
| node.argumentJudgments, |
| skipTypeArgumentInference: true); |
| ArgumentsJudgment.removeNonInferrableArgumentTypes(node.arguments); |
| } |
| |
| @override |
| void visitRethrow(Rethrow node, DartType typeContext) {} |
| |
| void visitReturnJudgment(ReturnJudgment node) { |
| var judgment = node.judgment; |
| var closureContext = inferrer.closureContext; |
| DartType typeContext = !closureContext.isGenerator |
| ? closureContext.returnOrYieldContext |
| : const UnknownType(); |
| DartType inferredType; |
| if (node.expression != null) { |
| inferrer.inferExpression(judgment, typeContext, true, |
| isVoidAllowed: true); |
| inferredType = getInferredType(judgment, inferrer); |
| } else { |
| inferredType = inferrer.coreTypes.nullClass.rawType; |
| } |
| closureContext.handleReturn(inferrer, node, inferredType, |
| !identical(node.returnKeywordLexeme, "return")); |
| } |
| |
| void visitStaticAssignmentJudgment( |
| StaticAssignmentJudgment node, DartType typeContext) { |
| DartType readType = const DynamicType(); // Only used in error recovery |
| var read = node.read; |
| if (read is StaticGet) { |
| readType = read.target.getterType; |
| node._storeLetType(inferrer, read, readType); |
| } |
| Member writeMember; |
| DartType writeContext = const UnknownType(); |
| var write = node.write; |
| if (write is StaticSet) { |
| writeContext = write.target.setterType; |
| writeMember = write.target; |
| if (writeMember is ShadowField && writeMember.inferenceNode != null) { |
| writeMember.inferenceNode.resolve(); |
| writeMember.inferenceNode = null; |
| } |
| } |
| node._inferRhs(inferrer, readType, writeContext); |
| node._replaceWithDesugared(); |
| return null; |
| } |
| |
| @override |
| void visitStaticGet(StaticGet node, DartType typeContext) { |
| var target = node.target; |
| if (target is ShadowField && target.inferenceNode != null) { |
| target.inferenceNode.resolve(); |
| target.inferenceNode = null; |
| } |
| var type = target.getterType; |
| if (target is Procedure && target.kind == ProcedureKind.Method) { |
| type = inferrer.instantiateTearOff(type, typeContext, node); |
| } |
| inferrer.storeInferredType(node, type); |
| } |
| |
| @override |
| void visitStaticInvocation(StaticInvocation node, DartType typeContext) { |
| FunctionType calleeType = node.target != null |
| ? node.target.function.functionType |
| : new FunctionType([], const DynamicType()); |
| bool hadExplicitTypeArguments = |
| getExplicitTypeArguments(node.arguments) != null; |
| var inferenceResult = inferrer.inferInvocation(typeContext, node.fileOffset, |
| calleeType, calleeType.returnType, node.arguments); |
| inferrer.storeInferredType(node, inferenceResult.type); |
| if (!hadExplicitTypeArguments && node.target != null) { |
| inferrer.library?.checkBoundsInStaticInvocation( |
| node, inferrer.typeSchemaEnvironment, |
| inferred: true); |
| } |
| } |
| |
| @override |
| void visitStringConcatenation( |
| StringConcatenation node, DartType typeContext) { |
| if (!inferrer.isTopLevel) { |
| for (var expression in node.expressions) { |
| inferrer.inferExpression( |
| expression, const UnknownType(), !inferrer.isTopLevel); |
| } |
| } |
| } |
| |
| @override |
| void visitStringLiteral(StringLiteral node, DartType typeContext) {} |
| |
| void visitSuperInitializerJudgment(SuperInitializerJudgment node) { |
| var substitution = Substitution.fromSupertype(inferrer.classHierarchy |
| .getClassAsInstanceOf( |
| inferrer.thisType.classNode, node.target.enclosingClass)); |
| inferrer.inferInvocation( |
| null, |
| node.fileOffset, |
| substitution.substituteType( |
| node.target.function.functionType.withoutTypeParameters), |
| inferrer.thisType, |
| node.argumentJudgments, |
| skipTypeArgumentInference: true); |
| } |
| |
| void visitSuperMethodInvocationJudgment( |
| SuperMethodInvocationJudgment node, DartType typeContext) { |
| if (node.interfaceTarget != null) { |
| inferrer.instrumentation?.record(inferrer.uri, node.fileOffset, 'target', |
| new InstrumentationValueForMember(node.interfaceTarget)); |
| } |
| var inferenceResult = inferrer.inferMethodInvocation( |
| node, null, node.fileOffset, false, typeContext, |
| interfaceMember: node.interfaceTarget, |
| methodName: node.name, |
| arguments: node.arguments); |
| node.inferredType = inferenceResult.type; |
| } |
| |
| void visitSuperPropertyGetJudgment( |
| SuperPropertyGetJudgment node, DartType typeContext) { |
| if (node.interfaceTarget != null) { |
| inferrer.instrumentation?.record(inferrer.uri, node.fileOffset, 'target', |
| new InstrumentationValueForMember(node.interfaceTarget)); |
| } |
| inferrer.inferPropertyGet(node, null, node.fileOffset, typeContext, |
| interfaceMember: node.interfaceTarget, propertyName: node.name); |
| } |
| |
| void visitSwitchStatementJudgment(SwitchStatementJudgment node) { |
| var expressionJudgment = node.expressionJudgment; |
| inferrer.inferExpression(expressionJudgment, const UnknownType(), true); |
| var expressionType = getInferredType(expressionJudgment, inferrer); |
| |
| for (var switchCase in node.caseJudgments) { |
| for (var caseExpression in switchCase.expressionJudgments) { |
| DartType caseExpressionType = |
| inferrer.inferExpression(caseExpression, expressionType, true); |
| |
| // Check whether the expression type is assignable to the case expression type. |
| if (!inferrer.isAssignable(expressionType, caseExpressionType)) { |
| inferrer.helper.addProblem( |
| templateSwitchExpressionNotAssignable.withArguments( |
| expressionType, caseExpressionType), |
| caseExpression.fileOffset, |
| noLength, |
| context: [ |
| messageSwitchExpressionNotAssignableCause.withLocation( |
| inferrer.uri, expressionJudgment.fileOffset, noLength) |
| ]); |
| } |
| } |
| inferrer.inferStatement(switchCase.bodyJudgment); |
| } |
| } |
| |
| void visitSymbolLiteralJudgment( |
| SymbolLiteralJudgment node, DartType typeContext) { |
| node.inferredType = inferrer.coreTypes.symbolClass.rawType; |
| return null; |
| } |
| |
| void visitInvalidConstructorInvocationJudgment( |
| InvalidConstructorInvocationJudgment node, DartType typeContext) { |
| FunctionType calleeType; |
| DartType returnType; |
| if (node.constructor != null) { |
| calleeType = node.constructor.function.functionType; |
| returnType = computeConstructorReturnType(node.constructor); |
| } else { |
| calleeType = new FunctionType([], const DynamicType()); |
| returnType = const DynamicType(); |
| } |
| ExpressionInferenceResult inferenceResult = inferrer.inferInvocation( |
| typeContext, |
| node.fileOffset, |
| calleeType, |
| returnType, |
| node.argumentJudgments); |
| node.inferredType = inferenceResult.type; |
| return visitSyntheticExpressionJudgment(node, typeContext); |
| } |
| |
| void visitInvalidWriteJudgment( |
| InvalidWriteJudgment node, DartType typeContext) { |
| // When a compound assignment, the expression is already wrapping in |
| // VariableDeclaration in _makeRead(). Otherwise, temporary associate |
| // the expression with this node. |
| node.expression.parent ??= node; |
| |
| inferrer.inferExpression( |
| node.expression, const UnknownType(), !inferrer.isTopLevel); |
| return visitSyntheticExpressionJudgment(node, typeContext); |
| } |
| |
| void visitSyntheticExpressionJudgment( |
| SyntheticExpressionJudgment node, DartType typeContext) { |
| node._replaceWithDesugared(); |
| node.inferredType = const DynamicType(); |
| return null; |
| } |
| |
| void visitThisExpression(ThisExpression node, DartType typeContext) {} |
| |
| @override |
| void visitThrow(Throw node, DartType typeContext) { |
| inferrer.inferExpression( |
| node.expression, const UnknownType(), !inferrer.isTopLevel); |
| } |
| |
| void visitCatchJudgment(CatchJudgment node) { |
| inferrer.inferStatement(node.bodyJudgment); |
| } |
| |
| void visitTryCatchJudgment(TryCatchJudgment node) { |
| inferrer.inferStatement(node.bodyJudgment); |
| for (var catch_ in node.catchJudgments) { |
| visitCatchJudgment(catch_); |
| } |
| } |
| |
| void visitTryFinallyJudgment(TryFinallyJudgment node) { |
| inferrer.inferStatement(node.body); |
| if (node.catchJudgments != null) { |
| for (var catch_ in node.catchJudgments) { |
| visitCatchJudgment(catch_); |
| } |
| node.body = new TryCatch(node.body, node.catches)..parent = node; |
| } |
| inferrer.inferStatement(node.finalizerJudgment); |
| } |
| |
| void visitTypeLiteralJudgment( |
| TypeLiteralJudgment node, DartType typeContext) { |
| node.inferredType = inferrer.coreTypes.typeClass.rawType; |
| return null; |
| } |
| |
| void visitVariableAssignmentJudgment( |
| VariableAssignmentJudgment node, DartType typeContext) { |
| DartType readType; |
| var read = node.read; |
| if (read is VariableGet) { |
| readType = read.promotedType ?? read.variable.type; |
| } |
| DartType writeContext = const UnknownType(); |
| var write = node.write; |
| if (write is VariableSet) { |
| writeContext = write.variable.type; |
| if (read != null) { |
| node._storeLetType(inferrer, read, writeContext); |
| } |
| } |
| node._inferRhs(inferrer, readType, writeContext); |
| node._replaceWithDesugared(); |
| return null; |
| } |
| |
| void visitVariableDeclarationJudgment(VariableDeclarationJudgment node) { |
| if (node.annotationJudgments.isNotEmpty) { |
| if (node.infersAnnotations) { |
| inferrer.inferMetadataKeepingHelper(node.annotationJudgments); |
| } |
| |
| // After the inference was done on the annotations, we may clone them for |
| // this instance of VariableDeclaration in order to avoid having the same |
| // annotation node for two VariableDeclaration nodes in a situation like |
| // the following: |
| // |
| // class Foo { const Foo(List<String> list); } |
| // |
| // @Foo(const []) |
| // var x, y; |
| CloneVisitor cloner = new CloneVisitor(); |
| for (int i = 0; i < node.annotations.length; ++i) { |
| kernel.Expression annotation = node.annotations[i]; |
| if (annotation.parent != node) { |
| node.annotations[i] = cloner.clone(annotation); |
| node.annotations[i].parent = node; |
| } |
| } |
| } |
| |
| var initializerJudgment = node.initializerJudgment; |
| var declaredType = node._implicitlyTyped ? const UnknownType() : node.type; |
| DartType inferredType; |
| DartType initializerType; |
| if (initializerJudgment != null) { |
| inferrer.inferExpression(initializerJudgment, declaredType, |
| !inferrer.isTopLevel || node._implicitlyTyped, |
| isVoidAllowed: true); |
| initializerType = getInferredType(initializerJudgment, inferrer); |
| inferredType = inferrer.inferDeclarationType(initializerType); |
| } else { |
| inferredType = const DynamicType(); |
| } |
| if (inferrer.strongMode && node._implicitlyTyped) { |
| inferrer.instrumentation?.record(inferrer.uri, node.fileOffset, 'type', |
| new InstrumentationValueForType(inferredType)); |
| node.type = inferredType; |
| } |
| if (node.initializer != null) { |
| var replacedInitializer = inferrer.ensureAssignable( |
| node.type, initializerType, node.initializer, node.fileOffset, |
| isVoidAllowed: node.type is VoidType); |
| if (replacedInitializer != null) { |
| node.initializer = replacedInitializer; |
| } |
| } |
| KernelLibraryBuilder inferrerLibrary = inferrer.library; |
| if (node._implicitlyTyped && inferrerLibrary is KernelLibraryBuilder) { |
| inferrerLibrary.checkBoundsInVariableDeclaration( |
| node, inferrer.typeSchemaEnvironment, |
| inferred: true); |
| } |
| } |
| |
| void visitUnresolvedTargetInvocationJudgment( |
| UnresolvedTargetInvocationJudgment node, DartType typeContext) { |
| var result = visitSyntheticExpressionJudgment(node, typeContext); |
| inferrer.inferInvocation( |
| typeContext, |
| node.fileOffset, |
| TypeInferrerImpl.unknownFunction, |
| const DynamicType(), |
| node.argumentsJudgment); |
| return result; |
| } |
| |
| void visitUnresolvedVariableAssignmentJudgment( |
| UnresolvedVariableAssignmentJudgment node, DartType typeContext) { |
| inferrer.inferExpression(node.rhs, const UnknownType(), true); |
| node.inferredType = node.isCompound |
| ? const DynamicType() |
| : getInferredType(node.rhs, inferrer); |
| return visitSyntheticExpressionJudgment(node, typeContext); |
| } |
| |
| void visitVariableGetJudgment( |
| VariableGetJudgment node, DartType typeContext) { |
| VariableDeclarationJudgment variable = node.variable; |
| bool mutatedInClosure = variable._mutatedInClosure; |
| DartType declaredOrInferredType = variable.type; |
| |
| DartType promotedType = inferrer.typePromoter |
| .computePromotedType(node._fact, node._scope, mutatedInClosure); |
| if (promotedType != null) { |
| inferrer.instrumentation?.record(inferrer.uri, node.fileOffset, |
| 'promotedType', new InstrumentationValueForType(promotedType)); |
| } |
| node.promotedType = promotedType; |
| var type = promotedType ?? declaredOrInferredType; |
| if (variable._isLocalFunction) { |
| type = inferrer.instantiateTearOff(type, typeContext, node); |
| } |
| node.inferredType = type; |
| return null; |
| } |
| |
| void visitWhileJudgment(WhileJudgment node) { |
| var conditionJudgment = node.conditionJudgment; |
| var expectedType = inferrer.coreTypes.boolClass.rawType; |
| inferrer.inferExpression( |
| conditionJudgment, expectedType, !inferrer.isTopLevel); |
| inferrer.ensureAssignable( |
| expectedType, |
| getInferredType(conditionJudgment, inferrer), |
| node.condition, |
| node.condition.fileOffset); |
| inferrer.inferStatement(node.bodyJudgment); |
| } |
| |
| void visitYieldJudgment(YieldJudgment node) { |
| var judgment = node.judgment; |
| var closureContext = inferrer.closureContext; |
| if (closureContext.isGenerator) { |
| var typeContext = closureContext.returnOrYieldContext; |
| if (node.isYieldStar && typeContext != null) { |
| typeContext = inferrer.wrapType( |
| typeContext, |
| closureContext.isAsync |
| ? inferrer.coreTypes.streamClass |
| : inferrer.coreTypes.iterableClass); |
| } |
| inferrer.inferExpression(judgment, typeContext, true); |
| } else { |
| inferrer.inferExpression(judgment, const UnknownType(), true); |
| } |
| closureContext.handleYield(inferrer, node.isYieldStar, |
| getInferredType(judgment, inferrer), node.expression, node.fileOffset); |
| } |
| |
| void visitLoadLibraryJudgment( |
| LoadLibraryJudgment node, DartType typeContext) { |
| node.inferredType = |
| inferrer.typeSchemaEnvironment.futureType(const DynamicType()); |
| if (node.arguments != null) { |
| var calleeType = new FunctionType([], node.inferredType); |
| inferrer.inferInvocation(typeContext, node.fileOffset, calleeType, |
| calleeType.returnType, node.argumentJudgments); |
| } |
| return null; |
| } |
| |
| void visitLoadLibraryTearOffJudgment( |
| LoadLibraryTearOffJudgment node, DartType typeContext) { |
| node.inferredType = new FunctionType( |
| [], inferrer.typeSchemaEnvironment.futureType(const DynamicType())); |
| return null; |
| } |
| |
| @override |
| void visitCheckLibraryIsLoaded( |
| CheckLibraryIsLoaded node, DartType typeContext) {} |
| } |
