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dart / sdk.git / ba58b96a80d77c4af3aab83e5a10afdd23d8c739 / . / pkg / analyzer / lib / src / generated / ffi_verifier.dart
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// Copyright (c) 2019, 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.
import 'package:analyzer/dart/ast/syntactic_entity.dart';
import 'package:analyzer/dart/ast/token.dart';
import 'package:analyzer/dart/ast/visitor.dart';
import 'package:analyzer/dart/constant/value.dart';
import 'package:analyzer/dart/element/element.dart';
import 'package:analyzer/dart/element/nullability_suffix.dart';
import 'package:analyzer/dart/element/type.dart';
import 'package:analyzer/error/listener.dart';
import 'package:analyzer/src/dart/ast/ast.dart';
import 'package:analyzer/src/dart/ast/extensions.dart';
import 'package:analyzer/src/dart/element/element.dart';
import 'package:analyzer/src/dart/element/type.dart';
import 'package:analyzer/src/dart/element/type_system.dart';
import 'package:analyzer/src/dart/error/ffi_code.dart';
/// A visitor used to find problems with the way the `dart:ffi` APIs are being
/// used. See 'pkg/vm/lib/transformations/ffi_checks.md' for the specification
/// of the desired hints.
class FfiVerifier extends RecursiveAstVisitor<void> {
static const _abiSpecificIntegerClassName = 'AbiSpecificInteger';
static const _abiSpecificIntegerMappingClassName =
'AbiSpecificIntegerMapping';
static const _allocateExtensionMethodName = 'call';
static const _allocatorClassName = 'Allocator';
static const _allocatorExtensionName = 'AllocatorAlloc';
static const _arrayClassName = 'Array';
static const _dartFfiLibraryName = 'dart.ffi';
static const _dartTypedDataLibraryName = 'dart.typed_data';
static const _finalizableClassName = 'Finalizable';
static const _isLeafParamName = 'isLeaf';
static const _nativeAddressOf = 'Native.addressOf';
static const _nativeCallable = 'NativeCallable';
static const _opaqueClassName = 'Opaque';
static const _addressOfExtensionNames = {
..._addressOfCompoundExtensionNames,
..._addressOfPrimitiveExtensionNames,
..._addressOfTypedDataExtensionNames,
};
static const _addressOfCompoundExtensionNames = {
'ArrayAddress',
'StructAddress',
'UnionAddress',
};
static const _addressOfPrimitiveExtensionNames = {
'BoolAddress',
'DoubleAddress',
'IntAddress',
};
static const _addressOfTypedDataExtensionNames = {
'Float32ListAddress',
'Float64ListAddress',
'Int16ListAddress',
'Int32ListAddress',
'Int64ListAddress',
'Int8ListAddress',
'Uint16ListAddress',
'Uint32ListAddress',
'Uint64ListAddress',
'Uint8ListAddress',
};
static const Set<String> _primitiveIntegerNativeTypesFixedSize = {
'Int8',
'Int16',
'Int32',
'Int64',
'Uint8',
'Uint16',
'Uint32',
'Uint64',
};
static const Set<String> _primitiveIntegerNativeTypes = {
..._primitiveIntegerNativeTypesFixedSize,
'IntPtr',
};
static const Set<String> _primitiveDoubleNativeTypes = {'Float', 'Double'};
static const _primitiveBoolNativeType = 'Bool';
static const _structClassName = 'Struct';
static const _unionClassName = 'Union';
/// The type system used to check types.
final TypeSystemImpl typeSystem;
/// Whether implicit casts should be reported as potential problems.
final bool strictCasts;
/// The diagnostic reporter used to report diagnostics.
final DiagnosticReporter _diagnosticReporter;
/// A flag indicating whether we are currently visiting inside a subclass of
/// `Struct`.
bool inCompound = false;
/// Subclass of `Struct` or `Union` we are currently visiting, or `null`.
ClassDeclaration? compound;
/// The `Void` type from `dart:ffi`, or `null` if unresolved.
InterfaceTypeImpl? ffiVoidType;
/// Initialize a newly created verifier.
FfiVerifier(
this.typeSystem,
this._diagnosticReporter, {
required this.strictCasts,
});
@override
void visitClassDeclaration(covariant ClassDeclarationImpl node) {
inCompound = false;
compound = null;
// Only the Allocator, Opaque and Struct class may be extended.
var extendsClause = node.extendsClause;
if (extendsClause != null) {
NamedType superclass = extendsClause.superclass;
var ffiClass = superclass.ffiClass;
if (ffiClass != null) {
var className = ffiClass.name;
if (className == _structClassName || className == _unionClassName) {
inCompound = true;
compound = node;
if (node.declaredFragment!.element.isEmptyStruct) {
_diagnosticReporter.atToken(
node.name,
FfiCode.EMPTY_STRUCT,
arguments: [node.name.lexeme, className ?? '<null>'],
);
}
if (className == _structClassName) {
_validatePackedAnnotation(node.metadata);
}
} else if (className == _abiSpecificIntegerClassName) {
_validateAbiSpecificIntegerAnnotation(node);
_validateAbiSpecificIntegerMappingAnnotation(
node.name,
node.metadata,
);
}
} else if (superclass.isCompoundSubtype ||
superclass.isAbiSpecificIntegerSubtype) {
_diagnosticReporter.atNode(
superclass,
FfiCode.SUBTYPE_OF_STRUCT_CLASS_IN_EXTENDS,
arguments: [node.name.lexeme, superclass.name.lexeme],
);
}
}
// No classes from the FFI may be explicitly implemented.
void checkSupertype(NamedType typename, FfiCode subtypeOfStructCode) {
var superName = typename.element?.name;
if (superName == _allocatorClassName ||
superName == _finalizableClassName) {
return;
}
if (typename.isCompoundSubtype || typename.isAbiSpecificIntegerSubtype) {
_diagnosticReporter.atNode(
typename,
subtypeOfStructCode,
arguments: [node.name.lexeme, typename.name.lexeme],
);
}
}
var implementsClause = node.implementsClause;
if (implementsClause != null) {
for (NamedType type in implementsClause.interfaces) {
checkSupertype(type, FfiCode.SUBTYPE_OF_STRUCT_CLASS_IN_IMPLEMENTS);
}
}
var withClause = node.withClause;
if (withClause != null) {
for (NamedType type in withClause.mixinTypes) {
checkSupertype(type, FfiCode.SUBTYPE_OF_STRUCT_CLASS_IN_WITH);
}
}
if (inCompound) {
if (node.declaredFragment!.element.typeParameters.isNotEmpty) {
_diagnosticReporter.atToken(
node.name,
FfiCode.GENERIC_STRUCT_SUBCLASS,
arguments: [node.name.lexeme],
);
}
var implementsClause = node.implementsClause;
if (implementsClause != null) {
var compoundType = node.declaredFragment!.element.thisType;
var structType = compoundType.superclass!;
var ffiLibrary = structType.element.library;
var finalizableElement = ffiLibrary.getClass(_finalizableClassName)!;
var finalizableType = finalizableElement.thisType;
if (typeSystem.isSubtypeOf(compoundType, finalizableType)) {
_diagnosticReporter.atToken(
node.name,
FfiCode.COMPOUND_IMPLEMENTS_FINALIZABLE,
arguments: [node.name.lexeme],
);
}
}
}
super.visitClassDeclaration(node);
inCompound = false;
}
@override
void visitFieldDeclaration(FieldDeclaration node) {
if (inCompound) {
_validateFieldsInCompound(node);
}
for (var declared in node.fields.variables) {
var declaredElement = declared.declaredFragment?.element;
if (declaredElement != null) {
_checkFfiNative(
errorNode: declared.name,
declarationElement: declaredElement,
formalParameterList: null,
isExternal: node.externalKeyword != null,
metadata: node.metadata,
);
}
}
super.visitFieldDeclaration(node);
}
@override
void visitFunctionDeclaration(FunctionDeclaration node) {
_checkFfiNative(
errorNode: node.name,
declarationElement: node.declaredFragment!.element,
formalParameterList: node.functionExpression.parameters,
metadata: node.metadata,
isExternal: node.externalKeyword != null,
);
super.visitFunctionDeclaration(node);
}
@override
void visitFunctionExpressionInvocation(
covariant FunctionExpressionInvocationImpl node,
) {
var element = node.element;
if (element is InternalMethodElement) {
var enclosingElement = element.enclosingElement;
if (enclosingElement.isAllocatorExtension &&
element.name == _allocateExtensionMethodName) {
_validateAllocate(node);
}
}
super.visitFunctionExpressionInvocation(node);
}
@override
void visitIndexExpression(covariant IndexExpressionImpl node) {
var element = node.element;
if (element is MethodElement) {
var enclosingElement = element.enclosingElement;
if (enclosingElement.isNativeStructPointerExtension ||
enclosingElement.isNativeStructArrayExtension ||
enclosingElement.isNativeUnionPointerExtension ||
enclosingElement.isNativeUnionArrayExtension) {
if (element.name == '[]') {
_validateRefIndexed(node);
}
}
}
}
@override
void visitInstanceCreationExpression(
covariant InstanceCreationExpressionImpl node,
) {
var constructor = node.constructorName.element;
var class_ = constructor?.enclosingElement;
if (class_.isStructSubclass || class_.isUnionSubclass) {
if (!constructor!.isFactory) {
_diagnosticReporter.atNode(
node.constructorName,
FfiCode.CREATION_OF_STRUCT_OR_UNION,
);
}
} else if (class_.isNativeCallable) {
_validateNativeCallable(node);
}
super.visitInstanceCreationExpression(node);
}
@override
void visitLibraryDirective(LibraryDirective node) {
// Ensure there is at most one @DefaultAsset annotation per library
var hasDefaultAsset = false;
if (node.element case LibraryElementImpl library) {
for (var annotation in library.metadata.annotations) {
var annotationValue = annotation.computeConstantValue();
if (annotationValue != null && annotationValue.isDefaultAsset) {
if (hasDefaultAsset) {
var name = annotation.annotationAst.name;
_diagnosticReporter.atNode(
name,
FfiCode.FFI_NATIVE_INVALID_DUPLICATE_DEFAULT_ASSET,
);
}
hasDefaultAsset = true;
}
}
}
super.visitLibraryDirective(node);
}
@override
void visitMethodDeclaration(MethodDeclaration node) {
_checkFfiNative(
errorNode: node.name,
declarationElement: node.declaredFragment!.element,
formalParameterList: node.parameters,
isExternal: node.externalKeyword != null,
metadata: node.metadata,
);
super.visitMethodDeclaration(node);
}
@override
void visitMethodInvocation(covariant MethodInvocationImpl node) {
var element = node.methodName.element;
if (element is InternalMethodElement) {
var enclosingElement = element.enclosingElement;
if (enclosingElement.isPointer) {
if (element.name == 'fromFunction') {
_validateFromFunction(node, element);
} else if (element.name == 'elementAt') {
_validateElementAt(node);
}
} else if (enclosingElement.isStruct || enclosingElement.isUnion) {
if (element.name == 'create') {
_validateCreate(node, enclosingElement!.name!);
}
} else if (enclosingElement.isNative) {
if (element.name == 'addressOf') {
_validateNativeAddressOf(node);
}
} else if (enclosingElement.isNativeFunctionPointerExtension) {
if (element.name == 'asFunction') {
_validateAsFunction(node, element);
}
} else if (enclosingElement.isDynamicLibraryExtension) {
if (element.name == 'lookupFunction') {
_validateLookupFunction(node);
}
} else if (enclosingElement.isNativeStructPointerExtension ||
enclosingElement.isNativeUnionPointerExtension) {
if (element.name == 'refWithFinalizer') {
_validateRefWithFinalizer(node);
}
}
} else if (element is TopLevelFunctionElement) {
if (element.library.name == 'dart.ffi') {
if (element.name == 'sizeOf') {
_validateSizeOf(node);
}
}
}
super.visitMethodInvocation(node);
}
@override
void visitPrefixedIdentifier(covariant PrefixedIdentifierImpl node) {
var element = node.element;
if (element != null) {
var enclosingElement = element.enclosingElement;
if (enclosingElement.isNativeStructPointerExtension ||
enclosingElement.isNativeUnionPointerExtension) {
if (element.name == 'ref') {
_validateRefPrefixedIdentifier(node);
}
} else if (enclosingElement.isAddressOfExtension) {
if (element.name == 'address') {
_validateAddressPrefixedIdentifier(node);
}
}
}
super.visitPrefixedIdentifier(node);
}
@override
void visitPropertyAccess(covariant PropertyAccessImpl node) {
var element = node.propertyName.element;
if (element != null) {
var enclosingElement = element.enclosingElement;
if (enclosingElement.isNativeStructPointerExtension ||
enclosingElement.isNativeUnionPointerExtension) {
if (element.name == 'ref') {
_validateRefPropertyAccess(node);
}
} else if (enclosingElement.isAddressOfExtension) {
if (element.name == 'address') {
_validateAddressPropertyAccess(node);
}
}
}
super.visitPropertyAccess(node);
}
@override
void visitTopLevelVariableDeclaration(TopLevelVariableDeclaration node) {
for (var declared in node.variables.variables) {
var declaredElement = declared.declaredFragment?.element;
if (declaredElement != null) {
_checkFfiNative(
errorNode: declared.name,
declarationElement: declaredElement,
formalParameterList: null,
isExternal: node.externalKeyword != null,
metadata: node.metadata,
);
}
}
super.visitTopLevelVariableDeclaration(node);
}
TypeImpl? _canonicalFfiTypeForDartType(TypeImpl dartType) {
if (dartType.isPointer || dartType.isCompoundSubtype || dartType.isArray) {
return dartType;
} else {
return null;
}
}
void _checkFfiNative({
required Token errorNode,
required Element declarationElement,
required NodeList<Annotation> metadata,
required FormalParameterList? formalParameterList,
required bool isExternal,
}) {
var formalParameters =
formalParameterList?.parameters ?? <FormalParameter>[];
var hadNativeAnnotation = false;
for (var annotation in declarationElement.metadata.annotations) {
var annotationValue = annotation.computeConstantValue();
var annotationType = annotationValue?.type; // Native<T>
if (annotationValue == null ||
annotationType is! InterfaceTypeImpl ||
!annotationValue.isNative) {
continue;
}
if (hadNativeAnnotation) {
var name = (annotation as ElementAnnotationImpl).annotationAst.name;
_diagnosticReporter.atNode(
name,
FfiCode.FFI_NATIVE_INVALID_MULTIPLE_ANNOTATIONS,
);
break;
}
hadNativeAnnotation = true;
if (!isExternal) {
_diagnosticReporter.atToken(
errorNode,
FfiCode.FFI_NATIVE_MUST_BE_EXTERNAL,
);
}
var ffiSignature = annotationType.typeArguments[0]; // The T in @Native<T>
if (ffiSignature is FunctionTypeImpl) {
if (declarationElement is InternalExecutableElement) {
_checkFfiNativeFunction(
errorNode,
declarationElement,
ffiSignature,
annotationValue,
formalParameters,
);
} else {
// Field annotated with a function type, that can't work.
_diagnosticReporter.atToken(
errorNode,
FfiCode.NATIVE_FIELD_INVALID_TYPE,
arguments: [ffiSignature],
);
}
} else {
if (declarationElement
case TopLevelFunctionElement() || MethodElement()) {
declarationElement = declarationElement as InternalExecutableElement;
var dartSignature = declarationElement.type;
if (declarationElement.isStatic && ffiSignature is DynamicType) {
// No type argument was given on the @Native annotation, so we try
// to infer the native type from the Dart signature.
if (dartSignature.returnType is VoidType) {
// The Dart signature has a `void` return type, so we create a new
// `FunctionType` with FFI's `Void` as the return type.
dartSignature = FunctionTypeImpl.v2(
typeParameters: dartSignature.typeParameters,
formalParameters: dartSignature.formalParameters,
returnType:
ffiVoidType ??=
annotationType.element.library
.getClass('Void')!
.thisType,
nullabilitySuffix: dartSignature.nullabilitySuffix,
);
}
_checkFfiNativeFunction(
errorNode,
declarationElement,
dartSignature,
annotationValue,
formalParameters,
);
return;
}
// Function annotated with something that isn't a function type.
_diagnosticReporter.atToken(
errorNode,
FfiCode.MUST_BE_A_NATIVE_FUNCTION_TYPE,
arguments: ['T', 'Native'],
);
} else {
_checkFfiNativeField(
errorNode,
declarationElement,
metadata,
ffiSignature,
annotationValue,
false,
);
}
}
}
}
void _checkFfiNativeField(
Token errorToken,
Element declarationElement,
NodeList<Annotation> metadata,
TypeImpl ffiSignature,
DartObject annotationValue,
bool allowVariableLength,
) {
TypeImpl type;
if (declarationElement is InternalFieldElement) {
if (!declarationElement.isStatic) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.NATIVE_FIELD_NOT_STATIC,
);
}
type = declarationElement.type;
} else if (declarationElement is TopLevelVariableElementImpl) {
type = declarationElement.type;
} else if (declarationElement is InternalPropertyAccessorElement) {
type = declarationElement.variable.type;
} else {
_diagnosticReporter.atToken(errorToken, FfiCode.NATIVE_FIELD_NOT_STATIC);
return;
}
if (ffiSignature is DynamicType) {
// Attempt to infer the native type from the Dart type.
var canonical = _canonicalFfiTypeForDartType(type);
if (canonical == null) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.NATIVE_FIELD_MISSING_TYPE,
);
return;
} else {
ffiSignature = canonical;
}
}
if (!_validateCompatibleNativeType(
_FfiTypeCheckDirection.nativeToDart,
type,
ffiSignature,
// Functions are not allowed in native fields, but allowing them in the
// subtype check allows reporting the more-specific diagnostic for the
// invalid field type.
allowFunctions: true,
)) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [type, ffiSignature, 'Native'],
);
} else if (ffiSignature.isArray) {
// Array fields need an `@Array` size annotation.
_validateSizeOfAnnotation(
errorToken,
metadata,
ffiSignature.arrayDimensions,
allowVariableLength,
);
} else if (ffiSignature.isHandle || ffiSignature.isNativeFunction) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.NATIVE_FIELD_INVALID_TYPE,
arguments: [ffiSignature],
);
}
}
void _checkFfiNativeFunction(
Token errorToken,
InternalExecutableElement declarationElement,
FunctionTypeImpl ffiSignature,
DartObject annotationValue,
List<FormalParameter> formalParameters,
) {
// Leaf call FFI Natives can't use Handles.
var isLeaf =
annotationValue.getField(_isLeafParamName)?.toBoolValue() ?? false;
if (isLeaf) {
_validateFfiLeafCallUsesNoHandles(ffiSignature, errorToken);
}
var ffiParameterTypes = ffiSignature.normalParameterTypes.flattenVarArgs();
var ffiParameters = ffiSignature.formalParameters;
if ((declarationElement is MethodElement ||
declarationElement is PropertyAccessorElement) &&
!declarationElement.isStatic) {
// Instance methods must have the receiver as an extra parameter in the
// Native annotation.
if (formalParameters.length + 1 != ffiParameterTypes.length) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.FFI_NATIVE_UNEXPECTED_NUMBER_OF_PARAMETERS_WITH_RECEIVER,
arguments: [formalParameters.length + 1, ffiParameterTypes.length],
);
return;
}
// Receiver can only be Pointer if the class extends
// NativeFieldWrapperClass1.
if (ffiSignature.normalParameterTypes[0].isPointer) {
var cls = declarationElement.enclosingElement as InterfaceElement;
if (!_extendsNativeFieldWrapperClass1(cls.thisType)) {
_diagnosticReporter.atToken(
errorToken,
FfiCode
.FFI_NATIVE_ONLY_CLASSES_EXTENDING_NATIVEFIELDWRAPPERCLASS1_CAN_BE_POINTER,
);
}
}
ffiParameterTypes = ffiParameterTypes.sublist(1);
ffiParameters = ffiParameters.sublist(1);
} else {
// Number of parameters in the Native annotation must match the
// annotated declaration.
if (formalParameters.length != ffiParameterTypes.length) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.FFI_NATIVE_UNEXPECTED_NUMBER_OF_PARAMETERS,
arguments: [ffiParameterTypes.length, formalParameters.length],
);
return;
}
}
// Arguments can only be Pointer if the class extends
// Pointer or NativeFieldWrapperClass1.
for (var i = 0; i < formalParameters.length; i++) {
if (ffiParameterTypes[i].isPointer) {
var type = formalParameters[i].declaredFragment!.element.type;
if (type is! InterfaceType ||
(!type.isPointer &&
!_extendsNativeFieldWrapperClass1(type) &&
!type.isTypedData)) {
_diagnosticReporter.atToken(
errorToken,
FfiCode
.FFI_NATIVE_ONLY_CLASSES_EXTENDING_NATIVEFIELDWRAPPERCLASS1_CAN_BE_POINTER,
);
}
}
}
var dartType = declarationElement.type;
var nativeType = FunctionTypeImpl.v2(
typeParameters: ffiSignature.typeParameters,
formalParameters: ffiParameters,
returnType: ffiSignature.returnType,
nullabilitySuffix: ffiSignature.nullabilitySuffix,
);
if (!_isValidFfiNativeFunctionType(nativeType)) {
var nativeTypeIsOmitted =
(annotationValue.type! as InterfaceType).typeArguments[0]
is DynamicType;
if (nativeTypeIsOmitted) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.NATIVE_FUNCTION_MISSING_TYPE,
);
} else {
_diagnosticReporter.atToken(
errorToken,
FfiCode.MUST_BE_A_NATIVE_FUNCTION_TYPE,
arguments: [nativeType, 'Native'],
);
}
return;
}
if (!_validateCompatibleFunctionTypes(
_FfiTypeCheckDirection.nativeToDart,
dartType,
nativeType,
nativeFieldWrappersAsPointer: true,
)) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [nativeType, dartType, 'Native'],
);
return;
}
}
bool _extendsNativeFieldWrapperClass1(InterfaceType? type) {
while (type != null) {
if (type.getDisplayString() == 'NativeFieldWrapperClass1') {
return true;
}
var element = type.element;
type = element.supertype;
}
return false;
}
bool _isConst(Expression expr) {
if (expr is Literal) {
return true;
}
if (expr is Identifier) {
var element = expr.element;
if (element is VariableElement && element.isConst) {
return true;
}
if (element is PropertyAccessorElement) {
if (element.variable.isConst) {
return true;
}
}
}
return false;
}
bool _isLeaf(NodeList<Expression>? args) {
if (args == null) {
return false;
}
for (var arg in args) {
if (arg is! NamedExpression || arg.element?.name != _isLeafParamName) {
continue;
}
return _maybeGetBoolConstValue(arg.expression) ?? false;
}
return false;
}
/// Returns `true` if [nativeType] is a C type that has a size.
bool _isSized(DartType nativeType) {
switch (_primitiveNativeType(nativeType)) {
case _PrimitiveDartType.double:
return true;
case _PrimitiveDartType.int:
return true;
case _PrimitiveDartType.bool:
return true;
case _PrimitiveDartType.void_:
return false;
case _PrimitiveDartType.handle:
return false;
case _PrimitiveDartType.none:
break;
}
if (nativeType.isCompoundSubtype) {
return true;
}
if (nativeType.isPointer) {
return true;
}
if (nativeType.isArray) {
return true;
}
if (nativeType.isAbiSpecificIntegerSubtype) {
return true;
}
return false;
}
/// Validates that the given type is a valid dart:ffi native function
/// signature.
bool _isValidFfiNativeFunctionType(TypeImpl nativeType) {
if (nativeType is FunctionTypeImpl && !nativeType.isDartCoreFunction) {
if (nativeType.namedParameterTypes.isNotEmpty ||
nativeType.optionalParameterTypes.isNotEmpty) {
return false;
}
if (!_isValidFfiNativeType(
nativeType.returnType,
allowVoid: true,
allowHandle: true,
)) {
return false;
}
for (var typeArg in nativeType.normalParameterTypes.flattenVarArgs()) {
if (!_isValidFfiNativeType(typeArg, allowHandle: true)) {
return false;
}
}
return true;
}
return false;
}
/// Validates that the given [nativeType] is a valid dart:ffi native type.
bool _isValidFfiNativeType(
TypeImpl? nativeType, {
bool allowVoid = false,
bool allowEmptyStruct = false,
bool allowArray = false,
bool allowHandle = false,
bool allowOpaque = false,
}) {
if (nativeType is InterfaceTypeImpl) {
var primitiveType = _primitiveNativeType(nativeType);
switch (primitiveType) {
case _PrimitiveDartType.void_:
return allowVoid;
case _PrimitiveDartType.handle:
return allowHandle;
case _PrimitiveDartType.double:
case _PrimitiveDartType.int:
case _PrimitiveDartType.bool:
return true;
case _PrimitiveDartType.none:
// These are the cases below.
break;
}
if (nativeType.isNativeFunction) {
return _isValidFfiNativeFunctionType(nativeType.typeArguments.single);
}
if (nativeType.isPointer) {
var nativeArgumentType = nativeType.typeArguments.single;
return _isValidFfiNativeType(
nativeArgumentType,
allowVoid: true,
allowEmptyStruct: true,
allowHandle: true,
allowOpaque: true,
) ||
nativeArgumentType.isCompoundSubtype ||
nativeArgumentType.isNativeType;
}
if (nativeType.isCompoundSubtype) {
if (!allowEmptyStruct) {
if (nativeType.element.isEmptyStruct) {
// TODO(dacoharkes): This results in an error message not mentioning
// empty structs at all.
// dartbug.com/36780
return false;
}
}
return true;
}
if (nativeType.isOpaque) {
return allowOpaque;
}
if (nativeType.isOpaqueSubtype) {
return true;
}
if (nativeType.isAbiSpecificIntegerSubtype) {
return true;
}
if (allowArray && nativeType.isArray) {
return _isValidFfiNativeType(nativeType.typeArguments.single);
}
} else if (nativeType is FunctionTypeImpl) {
return _isValidFfiNativeFunctionType(nativeType);
}
return false;
}
bool _isValidTypedData(InterfaceType nativeType, InterfaceType dartType) {
if (nativeType.isPointer) {
var elementType = nativeType.typeArguments.single;
var elementName = elementType.element?.name;
if (dartType.element.isTypedDataClass) {
if (elementName == 'Float' && dartType.element.name == 'Float32List') {
return true;
}
if (elementName == 'Double' && dartType.element.name == 'Float64List') {
return true;
}
if (_primitiveIntegerNativeTypesFixedSize.contains(elementName) &&
dartType.element.name == '${elementName}List') {
return true;
}
}
}
return false;
}
/// Get the const bool value of [expr] if it exists.
/// Return null if it isn't a const bool.
bool? _maybeGetBoolConstValue(Expression expr) {
if (expr is BooleanLiteral) {
return expr.value;
}
if (expr is Identifier) {
var element = expr.element;
if (element is VariableElement && element.isConst) {
return element.computeConstantValue()?.toBoolValue();
}
if (element is PropertyAccessorElement) {
var variable = element.variable;
if (variable.isConst) {
return variable.computeConstantValue()?.toBoolValue();
}
}
}
return null;
}
_PrimitiveDartType _primitiveNativeType(DartType nativeType) {
if (nativeType is InterfaceType) {
var element = nativeType.element;
if (element.isFfiClass) {
var name = element.name;
if (_primitiveIntegerNativeTypes.contains(name)) {
return _PrimitiveDartType.int;
}
if (_primitiveDoubleNativeTypes.contains(name)) {
return _PrimitiveDartType.double;
}
if (name == _primitiveBoolNativeType) {
return _PrimitiveDartType.bool;
}
if (name == 'Void') {
return _PrimitiveDartType.void_;
}
if (name == 'Handle') {
return _PrimitiveDartType.handle;
}
}
}
return _PrimitiveDartType.none;
}
/// Return an indication of the Dart type associated with the [annotation].
_PrimitiveDartType _typeForAnnotation(Annotation annotation) {
var element = annotation.element;
if (element is ConstructorElement) {
var name = element.enclosingElement.name;
if (_primitiveIntegerNativeTypes.contains(name)) {
return _PrimitiveDartType.int;
} else if (_primitiveDoubleNativeTypes.contains(name)) {
return _PrimitiveDartType.double;
} else if (_primitiveBoolNativeType == name) {
return _PrimitiveDartType.bool;
}
if (element.type.returnType.isAbiSpecificIntegerSubtype) {
return _PrimitiveDartType.int;
}
}
return _PrimitiveDartType.none;
}
void _validateAbiSpecificIntegerAnnotation(ClassDeclaration node) {
if ((node.typeParameters?.length ?? 0) != 0 ||
node.members.length != 1 ||
node.members.single is! ConstructorDeclaration ||
(node.members.single as ConstructorDeclaration).constKeyword == null) {
_diagnosticReporter.atToken(
node.name,
FfiCode.ABI_SPECIFIC_INTEGER_INVALID,
);
}
}
/// Validate that the [annotations] include at most one mapping annotation.
void _validateAbiSpecificIntegerMappingAnnotation(
Token errorToken,
NodeList<Annotation> annotations,
) {
var ffiPackedAnnotations =
annotations
.where((annotation) => annotation.isAbiSpecificIntegerMapping)
.toList();
if (ffiPackedAnnotations.isEmpty) {
_diagnosticReporter.atToken(
errorToken,
FfiCode.ABI_SPECIFIC_INTEGER_MAPPING_MISSING,
);
return;
}
if (ffiPackedAnnotations.length > 1) {
var extraAnnotations = ffiPackedAnnotations.skip(1);
for (var annotation in extraAnnotations) {
_diagnosticReporter.atNode(
annotation.name,
FfiCode.ABI_SPECIFIC_INTEGER_MAPPING_EXTRA,
);
}
}
var annotation = ffiPackedAnnotations.first;
var arguments = annotation.arguments?.arguments;
if (arguments == null) {
return;
}
for (var argument in arguments) {
if (argument is SetOrMapLiteral) {
for (var element in argument.elements) {
if (element is MapLiteralEntry) {
var valueType = element.value.staticType;
if (valueType is InterfaceType) {
var name = valueType.element.name!;
if (!_primitiveIntegerNativeTypesFixedSize.contains(name)) {
_diagnosticReporter.atNode(
element.value,
FfiCode.ABI_SPECIFIC_INTEGER_MAPPING_UNSUPPORTED,
arguments: [name],
);
}
}
}
}
return;
}
}
var annotationConstant =
annotation.elementAnnotation?.computeConstantValue();
var mappingValues = annotationConstant?.getField('mapping')?.toMapValue();
if (mappingValues == null) {
return;
}
for (var nativeType in mappingValues.values) {
var type = nativeType?.type;
if (type is InterfaceType) {
var nativeTypeName = type.element.name!;
if (!_primitiveIntegerNativeTypesFixedSize.contains(nativeTypeName)) {
_diagnosticReporter.atNode(
arguments.first,
FfiCode.ABI_SPECIFIC_INTEGER_MAPPING_UNSUPPORTED,
arguments: [nativeTypeName],
);
}
}
}
}
/// Check that .address is only used in argument lists passed to native leaf
/// calls.
void _validateAddressPosition(Expression node, AstNode errorNode) {
var parent = node.parent;
// Since we are allowing .address.cast(), we need to traverse up one level
// to get the ffi Invocation (.cast() nested down one level the expression)
if (parent is MethodInvocation &&
parent.methodName.element is MethodElement &&
parent.methodName.name == "cast" &&
parent.methodName.element?.enclosingElement is ClassElement &&
parent.methodName.element!.enclosingElement.isPointer) {
parent = parent.parent;
}
var grandParent = parent?.parent;
if (parent is! ArgumentList ||
grandParent is! MethodInvocation ||
!grandParent.isNativeLeafInvocation) {
_diagnosticReporter.atNode(errorNode, FfiCode.ADDRESS_POSITION);
}
}
void _validateAddressPrefixedIdentifier(PrefixedIdentifier node) {
var errorNode = node.identifier;
_validateAddressPosition(node, errorNode);
var extensionName = node.element?.enclosingElement?.name;
var receiver = node.prefix;
_validateAddressReceiver(node, extensionName, receiver, errorNode);
}
void _validateAddressPropertyAccess(PropertyAccess node) {
var errorNode = node.propertyName;
_validateAddressPosition(node, errorNode);
var extensionName = node.propertyName.element?.enclosingElement?.name;
var receiver = node.target;
_validateAddressReceiver(node, extensionName, receiver, errorNode);
}
void _validateAddressReceiver(
Expression node,
String? extensionName,
Expression? receiver,
AstNode errorNode,
) {
if (_addressOfCompoundExtensionNames.contains(extensionName) ||
_addressOfTypedDataExtensionNames.contains(extensionName)) {
return; // Only primitives need their reciever checked.
}
if (receiver == null) {
return;
}
switch (receiver) {
case IndexExpression _:
// Array or TypedData element.
var arrayOrTypedData = receiver.target;
var type = arrayOrTypedData?.staticType;
if (type?.isArray ?? false) {
return;
}
if (type?.isTypedData ?? false) {
return;
}
case PrefixedIdentifier _:
// Struct or Union field.
var compound = receiver.prefix;
var type = compound.staticType;
if (type?.isCompoundSubtype ?? false) {
return;
}
case PropertyAccess _:
// Struct or Union field.
var compound = receiver.target;
var type = compound?.staticType;
if (type?.isCompoundSubtype ?? false) {
return;
}
default:
}
_diagnosticReporter.atNode(errorNode, FfiCode.ADDRESS_RECEIVER);
}
void _validateAllocate(FunctionExpressionInvocationImpl node) {
var typeArgumentTypes = node.typeArgumentTypes;
if (typeArgumentTypes == null || typeArgumentTypes.length != 1) {
return;
}
var dartType = typeArgumentTypes[0];
if (!_isValidFfiNativeType(
dartType,
allowVoid: true,
allowEmptyStruct: true,
)) {
AstNode errorNode = node;
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['$_allocatorExtensionName.$_allocateExtensionMethodName'],
);
}
}
/// Validate that the [annotations] include exactly one annotation that
/// satisfies the [requiredType]. If an error is produced that cannot be
/// associated with an annotation, associate it with the [errorNode].
void _validateAnnotations(
TypeAnnotation errorNode,
NodeList<Annotation> annotations,
_PrimitiveDartType requiredType,
) {
bool requiredFound = false;
List<Annotation> extraAnnotations = [];
for (Annotation annotation in annotations) {
if (annotation.element.ffiClass != null ||
annotation.element?.enclosingElement.isAbiSpecificIntegerSubclass ==
true) {
if (requiredFound) {
extraAnnotations.add(annotation);
} else {
_PrimitiveDartType foundType = _typeForAnnotation(annotation);
if (foundType == requiredType) {
requiredFound = true;
} else {
extraAnnotations.add(annotation);
}
}
}
}
if (extraAnnotations.isNotEmpty) {
if (!requiredFound) {
Annotation invalidAnnotation = extraAnnotations.removeAt(0);
_diagnosticReporter.atNode(
invalidAnnotation,
FfiCode.MISMATCHED_ANNOTATION_ON_STRUCT_FIELD,
);
}
for (Annotation extraAnnotation in extraAnnotations) {
_diagnosticReporter.atNode(
extraAnnotation,
FfiCode.EXTRA_ANNOTATION_ON_STRUCT_FIELD,
);
}
} else if (!requiredFound) {
_diagnosticReporter.atNode(
errorNode,
FfiCode.MISSING_ANNOTATION_ON_STRUCT_FIELD,
arguments: [
errorNode.type!,
compound!.extendsClause!.superclass.name.lexeme,
],
);
}
}
/// Validate the invocation of the instance method
/// `Pointer<T>.asFunction<F>()`.
void _validateAsFunction(
covariant MethodInvocationImpl node,
InternalMethodElement element,
) {
var typeArguments = node.typeArguments?.arguments;
AstNode errorNode = typeArguments != null ? typeArguments[0] : node;
if (typeArguments != null && typeArguments.length == 1) {
if (_validateTypeArgument(typeArguments[0], 'asFunction')) {
return;
}
}
var target = node.realTarget!;
var targetType = target.staticType;
if (targetType is InterfaceTypeImpl && targetType.isPointer) {
var T = targetType.typeArguments[0];
if (!T.isNativeFunction) {
return;
}
var pointerTypeArg = (T as InterfaceTypeImpl).typeArguments.single;
if (pointerTypeArg is TypeParameterType) {
_diagnosticReporter.atNode(
target,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['asFunction'],
);
return;
}
if (!_isValidFfiNativeFunctionType(pointerTypeArg)) {
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_NATIVE_FUNCTION_TYPE_ARGUMENT_TO_POINTER,
arguments: [T],
);
return;
}
var TPrime = T.typeArguments[0];
var F = node.typeArgumentTypes![0];
var isLeaf = _isLeaf(node.argumentList.arguments);
if (!_validateCompatibleFunctionTypes(
_FfiTypeCheckDirection.nativeToDart,
F,
TPrime,
)) {
_diagnosticReporter.atNode(
node,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [TPrime, F, 'asFunction'],
);
}
if (isLeaf) {
_validateFfiLeafCallUsesNoHandles(TPrime, node.methodName.token);
}
}
_validateIsLeafIsConst(node);
}
/// Validates that the given [nativeType] is, when native types are converted
/// to their Dart equivalent, a subtype of [dartType].
bool _validateCompatibleFunctionTypes(
_FfiTypeCheckDirection direction,
TypeImpl dartType,
TypeImpl nativeType, {
bool nativeFieldWrappersAsPointer = false,
}) {
// We require both to be valid function types.
if (dartType is! FunctionTypeImpl ||
dartType.isDartCoreFunction ||
nativeType is! FunctionTypeImpl ||
nativeType.isDartCoreFunction) {
return false;
}
var nativeTypeNormalParameterTypes =
nativeType.normalParameterTypes.flattenVarArgs();
// We disallow any optional parameters.
int parameterCount = dartType.normalParameterTypes.length;
if (parameterCount != nativeTypeNormalParameterTypes.length) {
return false;
}
// We disallow generic function types.
if (dartType.typeParameters.isNotEmpty ||
nativeType.typeParameters.isNotEmpty) {
return false;
}
if (dartType.namedParameterTypes.isNotEmpty ||
dartType.optionalParameterTypes.isNotEmpty ||
nativeType.namedParameterTypes.isNotEmpty ||
nativeType.optionalParameterTypes.isNotEmpty) {
return false;
}
// Validate that the return types are compatible.
if (!_validateCompatibleNativeType(
direction,
dartType.returnType,
nativeType.returnType,
)) {
return false;
}
// Validate that the parameter types are compatible.
for (int i = 0; i < parameterCount; ++i) {
if (!_validateCompatibleNativeType(
direction.reverse,
dartType.normalParameterTypes[i],
nativeTypeNormalParameterTypes[i],
nativeFieldWrappersAsPointer: nativeFieldWrappersAsPointer,
)) {
return false;
}
}
// Signatures have same number of parameters and the types match.
return true;
}
/// Validates that the [nativeType] can be converted to the [dartType] if
/// [direction] is [_FfiTypeCheckDirection.nativeToDart], or the reverse for
/// [_FfiTypeCheckDirection.dartToNative].
bool _validateCompatibleNativeType(
_FfiTypeCheckDirection direction,
TypeImpl dartType,
TypeImpl nativeType, {
bool nativeFieldWrappersAsPointer = false,
bool allowFunctions = false,
}) {
var nativeReturnType = _primitiveNativeType(nativeType);
if (nativeReturnType == _PrimitiveDartType.int ||
(nativeType is InterfaceTypeImpl &&
nativeType.superclass?.element.name ==
_abiSpecificIntegerClassName)) {
return dartType.isDartCoreInt;
} else if (nativeReturnType == _PrimitiveDartType.double) {
return dartType.isDartCoreDouble;
} else if (nativeReturnType == _PrimitiveDartType.bool) {
return dartType.isDartCoreBool;
} else if (nativeReturnType == _PrimitiveDartType.void_) {
return direction == _FfiTypeCheckDirection.dartToNative
? true
: dartType is VoidType;
} else if (dartType is VoidType) {
// Don't allow other native subtypes if the Dart return type is void.
return nativeReturnType == _PrimitiveDartType.void_;
} else if (nativeReturnType == _PrimitiveDartType.handle) {
// `Handle` matches against any type in positions of any variance.
return true;
} else if (dartType is InterfaceTypeImpl &&
nativeType is InterfaceTypeImpl) {
if (nativeFieldWrappersAsPointer &&
_extendsNativeFieldWrapperClass1(dartType)) {
// Must be `Pointer<Void>`, `Handle` already checked above.
return nativeType.isPointer &&
_primitiveNativeType(nativeType.typeArguments.single) ==
_PrimitiveDartType.void_;
}
// Always allow typed data here, error on nonLeaf or return value in
// `_validateFfiNonLeafCallUsesNoTypedData`.
if (_isValidTypedData(nativeType, dartType)) {
return true;
}
return direction == _FfiTypeCheckDirection.dartToNative
? typeSystem.isSubtypeOf(dartType, nativeType)
: typeSystem.isSubtypeOf(nativeType, dartType);
} else if (dartType is FunctionTypeImpl &&
allowFunctions &&
nativeType is InterfaceTypeImpl &&
nativeType.isNativeFunction) {
var nativeFunction = nativeType.typeArguments[0];
return _validateCompatibleFunctionTypes(
direction,
dartType,
nativeFunction,
nativeFieldWrappersAsPointer: nativeFieldWrappersAsPointer,
);
} else {
// If the [nativeType] is not a primitive int/double type then it has to
// be a Pointer type atm.
return false;
}
}
void _validateCreate(MethodInvocationImpl node, String errorClass) {
var typeArgumentTypes = node.typeArgumentTypes;
if (typeArgumentTypes == null || typeArgumentTypes.length != 1) {
return;
}
var dartType = typeArgumentTypes[0];
if (!_isValidFfiNativeType(dartType)) {
AstNode errorNode = node;
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['$errorClass.create'],
);
}
}
void _validateElementAt(MethodInvocation node) {
var targetType = node.realTarget?.staticType;
if (targetType is InterfaceTypeImpl && targetType.isPointer) {
var T = targetType.typeArguments[0];
if (!_isValidFfiNativeType(T, allowVoid: true, allowEmptyStruct: true)) {
AstNode errorNode = node;
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['elementAt'],
);
}
}
}
void _validateFfiLeafCallUsesNoHandles(
DartType nativeType,
SyntacticEntity errorEntity,
) {
if (nativeType is FunctionType) {
if (_primitiveNativeType(nativeType.returnType) ==
_PrimitiveDartType.handle) {
_diagnosticReporter.atEntity(
errorEntity,
FfiCode.LEAF_CALL_MUST_NOT_RETURN_HANDLE,
);
}
for (var param in nativeType.normalParameterTypes) {
if (_primitiveNativeType(param) == _PrimitiveDartType.handle) {
_diagnosticReporter.atEntity(
errorEntity,
FfiCode.LEAF_CALL_MUST_NOT_TAKE_HANDLE,
);
}
}
}
}
/// Validate that the fields declared by the given [node] meet the
/// requirements for fields within a struct or union class.
void _validateFieldsInCompound(FieldDeclaration node) {
if (node.isStatic) {
return;
}
VariableDeclarationList fields = node.fields;
NodeList<Annotation> annotations = node.metadata;
if (node.externalKeyword == null) {
_diagnosticReporter.atToken(
fields.variables[0].name,
FfiCode.FIELD_MUST_BE_EXTERNAL_IN_STRUCT,
);
}
var fieldType = fields.type;
if (fieldType == null) {
_diagnosticReporter.atToken(
fields.variables[0].name,
FfiCode.MISSING_FIELD_TYPE_IN_STRUCT,
);
} else {
DartType declaredType = fieldType.typeOrThrow;
if (declaredType.nullabilitySuffix == NullabilitySuffix.question) {
_diagnosticReporter.atNode(
fieldType,
FfiCode.INVALID_FIELD_TYPE_IN_STRUCT,
arguments: [fieldType.toSource()],
);
} else if (declaredType.isDartCoreInt) {
_validateAnnotations(fieldType, annotations, _PrimitiveDartType.int);
} else if (declaredType.isDartCoreDouble) {
_validateAnnotations(fieldType, annotations, _PrimitiveDartType.double);
} else if (declaredType.isDartCoreBool) {
_validateAnnotations(fieldType, annotations, _PrimitiveDartType.bool);
} else if (declaredType.isPointer) {
_validateNoAnnotations(annotations);
} else if (declaredType.isArray) {
var typeArg = (declaredType as InterfaceType).typeArguments.single;
if (!_isSized(typeArg)) {
AstNode errorNode = fieldType;
if (fieldType is NamedType) {
var typeArguments = fieldType.typeArguments?.arguments;
if (typeArguments != null && typeArguments.isNotEmpty) {
errorNode = typeArguments[0];
}
}
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_SIZED_TYPE_ARGUMENT,
arguments: [_arrayClassName, typeArg],
);
}
var arrayDimensions = declaredType.arrayDimensions;
var fieldElement =
node.fields.variables.first.declaredFragment?.element;
var lastElement =
(fieldElement?.enclosingElement as ClassElement?)?.fields.reversed
.where((field) {
if (field.isStatic) return false;
if (!field.isExternal) {
if (!(field.getter?.isExternal ?? false) &&
!(field.setter?.isExternal ?? false)) {
return false;
}
}
return true;
})
.firstOrNull;
var isLastField = fieldElement == lastElement;
_validateSizeOfAnnotation(
fieldType,
annotations,
arrayDimensions,
isLastField,
);
} else if (declaredType.isCompoundSubtype) {
var clazz = (declaredType as InterfaceType).element;
if (clazz.isEmptyStruct) {
_diagnosticReporter.atNode(
node,
FfiCode.EMPTY_STRUCT,
arguments: [clazz.name!, clazz.supertype!.getDisplayString()],
);
}
} else {
_diagnosticReporter.atNode(
fieldType,
FfiCode.INVALID_FIELD_TYPE_IN_STRUCT,
arguments: [fieldType.toSource()],
);
}
}
}
/// Validate the invocation of the static method
/// `Pointer<T>.fromFunction(f, e)`.
void _validateFromFunction(MethodInvocationImpl node, MethodElement element) {
int argCount = node.argumentList.arguments.length;
if (argCount < 1 || argCount > 2) {
// There are other diagnostics reported against the invocation and the
// diagnostics generated below might be inaccurate, so don't report them.
return;
}
var T = node.typeArgumentTypes![0];
if (!_isValidFfiNativeFunctionType(T)) {
AstNode errorNode = node.methodName;
var typeArgument = node.typeArguments?.arguments[0];
if (typeArgument != null) {
errorNode = typeArgument;
}
_diagnosticReporter.atNode(
errorNode,
FfiCode.MUST_BE_A_NATIVE_FUNCTION_TYPE,
arguments: [T, 'fromFunction'],
);
return;
}
var f = node.argumentList.arguments[0];
var FT = f.typeOrThrow;
if (!_validateCompatibleFunctionTypes(
_FfiTypeCheckDirection.dartToNative,
FT,
T,
)) {
_diagnosticReporter.atNode(
f,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [FT, T, 'fromFunction'],
);
return;
}
// TODO(brianwilkerson): Validate that `f` is a top-level function.
var R = (T as FunctionTypeImpl).returnType;
if (_primitiveNativeType(R) == _PrimitiveDartType.void_ ||
R.isPointer ||
R.isHandle ||
R.isCompoundSubtype) {
if (argCount != 1) {
_diagnosticReporter.atNode(
node.argumentList.arguments[1],
FfiCode.INVALID_EXCEPTION_VALUE,
arguments: ['fromFunction'],
);
}
} else if (argCount != 2) {
_diagnosticReporter.atNode(
node.methodName,
FfiCode.MISSING_EXCEPTION_VALUE,
arguments: ['fromFunction'],
);
} else {
Expression e = node.argumentList.arguments[1];
var eType = e.typeOrThrow;
if (!_validateCompatibleNativeType(
_FfiTypeCheckDirection.dartToNative,
eType,
R,
)) {
_diagnosticReporter.atNode(
e,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [eType, R, 'fromFunction'],
);
}
if (!_isConst(e)) {
_diagnosticReporter.atNode(
e,
FfiCode.ARGUMENT_MUST_BE_A_CONSTANT,
arguments: ['exceptionalReturn'],
);
}
}
}
/// Ensure `isLeaf` is const as we need the value at compile time to know
/// which trampoline to generate.
void _validateIsLeafIsConst(MethodInvocation node) {
var args = node.argumentList.arguments;
if (args.isNotEmpty) {
for (var arg in args) {
if (arg is NamedExpression) {
if (arg.element?.name == _isLeafParamName) {
if (!_isConst(arg.expression)) {
_diagnosticReporter.atNode(
arg.expression,
FfiCode.ARGUMENT_MUST_BE_A_CONSTANT,
arguments: [_isLeafParamName],
);
}
}
}
}
}
}
/// Validate the invocation of the instance method
/// `DynamicLibrary.lookupFunction<S, F>()`.
void _validateLookupFunction(MethodInvocationImpl node) {
var typeArguments = node.typeArguments?.arguments;
if (typeArguments == null || typeArguments.length != 2) {
// There are other diagnostics reported against the invocation and the
// diagnostics generated below might be inaccurate, so don't report them.
return;
}
var argTypes = node.typeArgumentTypes!;
var S = argTypes[0];
var F = argTypes[1];
if (!_isValidFfiNativeFunctionType(S)) {
AstNode errorNode = typeArguments[0];
_diagnosticReporter.atNode(
errorNode,
FfiCode.MUST_BE_A_NATIVE_FUNCTION_TYPE,
arguments: [S, 'lookupFunction'],
);
return;
}
var isLeaf = _isLeaf(node.argumentList.arguments);
if (!_validateCompatibleFunctionTypes(
_FfiTypeCheckDirection.nativeToDart,
F,
S,
)) {
AstNode errorNode = typeArguments[1];
_diagnosticReporter.atNode(
errorNode,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [S, F, 'lookupFunction'],
);
}
_validateIsLeafIsConst(node);
if (isLeaf) {
_validateFfiLeafCallUsesNoHandles(S, typeArguments[0]);
}
}
/// Validate the invocation of `Native.addressOf`.
void _validateNativeAddressOf(MethodInvocationImpl node) {
var typeArguments = node.typeArgumentTypes;
var arguments = node.argumentList.arguments;
if (typeArguments == null ||
typeArguments.length != 1 ||
arguments.length != 1) {
// There are other diagnostics reported against the invocation and the
// diagnostics generated below might be inaccurate, so don't report them.
return;
}
var argument = arguments[0];
var targetType = typeArguments[0];
var validTarget = false;
var referencedElement = switch (argument) {
IdentifierImpl() => argument.element?.nonSynthetic,
_ => null,
};
if (referencedElement != null) {
for (var annotation in referencedElement.metadata.annotations) {
var value = annotation.computeConstantValue();
var annotationType = value?.type;
if (annotationType is InterfaceTypeImpl &&
annotationType.element.isNative) {
var nativeType = annotationType.typeArguments[0];
if (nativeType is FunctionType) {
// When referencing a function, the target type must be a
// `NativeFunction<T>` so that `T` matches the type from the
// annotation.
if (targetType case InterfaceTypeImpl(isNativeFunction: true)) {
var targetFunctionType = targetType.typeArguments[0];
if (!typeSystem.isEqualTo(nativeType, targetFunctionType)) {
_diagnosticReporter.atNode(
node,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [nativeType, targetFunctionType, _nativeAddressOf],
);
}
} else {
_diagnosticReporter.atNode(
node,
FfiCode.MUST_BE_A_NATIVE_FUNCTION_TYPE,
arguments: [targetType, _nativeAddressOf],
);
}
} else {
if (argument.staticType case var staticType?
when nativeType is DynamicType) {
// No type argument was given on the @Native annotation, so we try
// to infer the native type from the Dart signature.
if (staticType is FunctionTypeImpl) {
if (staticType.returnType is VoidType) {
// The Dart signature has a `void` return type, so we create a
// new `FunctionType` with FFI's `Void` as the return type.
staticType = FunctionTypeImpl.v2(
typeParameters: staticType.typeParameters,
formalParameters: staticType.formalParameters,
returnType:
ffiVoidType ??=
annotationType.element.library
.getClass('Void')!
.thisType,
nullabilitySuffix: staticType.nullabilitySuffix,
);
}
if (targetType case InterfaceTypeImpl(isNativeFunction: true)) {
var targetFunctionType = targetType.typeArguments[0];
if (!typeSystem.isEqualTo(staticType, targetFunctionType)) {
_diagnosticReporter.atNode(
node,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [
staticType,
targetFunctionType,
_nativeAddressOf,
],
);
}
} else {
_diagnosticReporter.atNode(
node,
FfiCode.MUST_BE_A_NATIVE_FUNCTION_TYPE,
arguments: [targetType, _nativeAddressOf],
);
}
} else {
if (!typeSystem.isEqualTo(staticType, targetType)) {
_diagnosticReporter.atNode(
node,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [staticType, targetType, _nativeAddressOf],
);
}
}
}
}
validTarget = true;
break;
}
}
}
if (!validTarget) {
_diagnosticReporter.atNode(argument, FfiCode.ARGUMENT_MUST_BE_NATIVE);
}
}
/// Validate the invocation of the constructor `NativeCallable.listener(f)`
/// or `NativeCallable.isolateLocal(f)`.
void _validateNativeCallable(InstanceCreationExpressionImpl node) {
var name = node.constructorName.name?.toString() ?? '';
var isolateLocal = name == 'isolateLocal';
// listener takes 1 arg, isolateLocal takes 1 or 2.
var argCount = node.argumentList.arguments.length;
if (!(argCount == 1 || (isolateLocal && argCount == 2))) {
// There are other diagnostics reported against the invocation and the
// diagnostics generated below might be inaccurate, so don't report them.
return;
}
var nodeType = node.typeOrThrow;
if (nodeType is! InterfaceTypeImpl) {
return;
}
var typeArg = nodeType.typeArguments[0];
if (!_isValidFfiNativeFunctionType(typeArg)) {
_diagnosticReporter.atNode(
node.constructorName,
FfiCode.MUST_BE_A_NATIVE_FUNCTION_TYPE,
arguments: [typeArg, _nativeCallable],
);
return;
}
var f = node.argumentList.arguments[0];
var funcType = f.typeOrThrow;
if (!_validateCompatibleFunctionTypes(
_FfiTypeCheckDirection.dartToNative,
funcType,
typeArg,
)) {
_diagnosticReporter.atNode(
f,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [funcType, typeArg, _nativeCallable],
);
return;
}
var natRetType = (typeArg as FunctionTypeImpl).returnType;
if (isolateLocal) {
if (_primitiveNativeType(natRetType) == _PrimitiveDartType.void_ ||
natRetType.isPointer ||
natRetType.isHandle ||
natRetType.isCompoundSubtype) {
if (argCount != 1) {
_diagnosticReporter.atNode(
node.argumentList.arguments[1],
FfiCode.INVALID_EXCEPTION_VALUE,
arguments: [name],
);
}
} else if (argCount != 2) {
_diagnosticReporter.atNode(
node,
FfiCode.MISSING_EXCEPTION_VALUE,
arguments: [name],
);
} else {
var e = (node.argumentList.arguments[1] as NamedExpression).expression;
var eType = e.typeOrThrow;
if (!_validateCompatibleNativeType(
_FfiTypeCheckDirection.dartToNative,
eType,
natRetType,
)) {
_diagnosticReporter.atNode(
e,
FfiCode.MUST_BE_A_SUBTYPE,
arguments: [eType, natRetType, name],
);
}
if (!_isConst(e)) {
_diagnosticReporter.atNode(
e,
FfiCode.ARGUMENT_MUST_BE_A_CONSTANT,
arguments: ['exceptionalReturn'],
);
}
}
} else {
if (_primitiveNativeType(natRetType) != _PrimitiveDartType.void_) {
_diagnosticReporter.atNode(
f,
FfiCode.MUST_RETURN_VOID,
arguments: [natRetType],
);
}
}
}
/// Validate that none of the [annotations] are from `dart:ffi`.
void _validateNoAnnotations(NodeList<Annotation> annotations) {
for (Annotation annotation in annotations) {
if (annotation.element.ffiClass != null) {
_diagnosticReporter.atNode(
annotation,
FfiCode.ANNOTATION_ON_POINTER_FIELD,
);
}
}
}
/// Validate that the [annotations] include at most one packed annotation.
void _validatePackedAnnotation(NodeList<Annotation> annotations) {
var ffiPackedAnnotations =
annotations.where((annotation) => annotation.isPacked).toList();
if (ffiPackedAnnotations.isEmpty) {
return;
}
if (ffiPackedAnnotations.length > 1) {
var extraAnnotations = ffiPackedAnnotations.skip(1);
for (var annotation in extraAnnotations) {
_diagnosticReporter.atNode(annotation, FfiCode.PACKED_ANNOTATION);
}
}
// Check number of dimensions.
var annotation = ffiPackedAnnotations.first;
var value = annotation.elementAnnotation?.packedMemberAlignment;
if (![1, 2, 4, 8, 16].contains(value)) {
AstNode errorNode = annotation;
var arguments = annotation.arguments?.arguments;
if (arguments != null && arguments.isNotEmpty) {
errorNode = arguments[0];
}
_diagnosticReporter.atNode(
errorNode,
FfiCode.PACKED_ANNOTATION_ALIGNMENT,
);
}
}
void _validateRefIndexed(IndexExpressionImpl node) {
var targetType = node.realTarget.typeOrThrow;
if (!_isValidFfiNativeType(
targetType,
allowEmptyStruct: true,
allowArray: true,
)) {
AstNode errorNode = node;
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['[]'],
);
}
}
/// Validate the invocation of the extension method
/// `Pointer<T extends Struct>.ref`.
void _validateRefPrefixedIdentifier(PrefixedIdentifierImpl node) {
var targetType = node.prefix.staticType;
if (!_isValidFfiNativeType(targetType, allowEmptyStruct: true)) {
AstNode errorNode = node;
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['ref'],
);
}
}
void _validateRefPropertyAccess(PropertyAccessImpl node) {
var targetType = node.realTarget.typeOrThrow;
if (!_isValidFfiNativeType(targetType, allowEmptyStruct: true)) {
AstNode errorNode = node;
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['ref'],
);
}
}
/// Validate the invocation of the
/// `Pointer<T extends Struct>.refWithFinalizer` and
/// `Pointer<T extends Union>.refWithFinalizer` extension methods.
void _validateRefWithFinalizer(MethodInvocationImpl node) {
var targetType = node.realTarget?.typeOrThrow;
if (!_isValidFfiNativeType(targetType, allowEmptyStruct: true)) {
_diagnosticReporter.atNode(
node,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['refWithFinalizer'],
);
}
}
void _validateSizeOf(MethodInvocationImpl node) {
var typeArgumentTypes = node.typeArgumentTypes;
if (typeArgumentTypes == null || typeArgumentTypes.length != 1) {
return;
}
var T = typeArgumentTypes[0];
if (!_isValidFfiNativeType(T, allowVoid: true, allowEmptyStruct: true)) {
AstNode errorNode = node;
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: ['sizeOf'],
);
}
}
/// Validate that the [annotations] include exactly one size annotation. If
/// an error is produced that cannot be associated with an annotation,
/// associate it with the [errorEntity].
void _validateSizeOfAnnotation(
SyntacticEntity errorEntity,
NodeList<Annotation> annotations,
int arrayDimensions,
bool allowVariableLength,
) {
var ffiSizeAnnotations =
annotations.where((annotation) => annotation.isArray).toList();
if (ffiSizeAnnotations.isEmpty) {
_diagnosticReporter.atEntity(
errorEntity,
FfiCode.MISSING_SIZE_ANNOTATION_CARRAY,
);
return;
}
if (ffiSizeAnnotations.length > 1) {
var extraAnnotations = ffiSizeAnnotations.skip(1);
for (var annotation in extraAnnotations) {
_diagnosticReporter.atNode(
annotation,
FfiCode.EXTRA_SIZE_ANNOTATION_CARRAY,
);
}
}
// Check number of dimensions.
var annotation = ffiSizeAnnotations.first;
var (dimensions, variableLength) =
annotation.elementAnnotation?.arraySizeDimensions ?? (<int>[], false);
var annotationDimensions = dimensions.length;
if (annotationDimensions != arrayDimensions) {
_diagnosticReporter.atNode(
annotation,
FfiCode.SIZE_ANNOTATION_DIMENSIONS,
);
}
if (variableLength) {
if (!allowVariableLength) {
_diagnosticReporter.atNode(
annotation,
FfiCode.VARIABLE_LENGTH_ARRAY_NOT_LAST,
);
}
}
// Check dimensions are valid.
(List<AstNode>? dimensionsNodes, AstNode? variableDimensionNode)
getArgumentNodes() {
return switch (annotation.arguments) {
// `@Array.variableMulti([..], variableDimension: ..)`
ArgumentList(
arguments: [
ListLiteral dimensions,
NamedExpression variableDimension,
],
) =>
(dimensions.elements, variableDimension.expression),
// `@Array.variableMulti([..])`
ArgumentList(arguments: [ListLiteral dimensions]) => (
dimensions.elements,
null,
),
// `@Array(..)`, `@Array.variable(..)`,
// `@Array.variableWithVariableDimension(..)`
ArgumentList(arguments: NodeList<AstNode> dimensions) => (
dimensions,
null,
),
_ => (null, null),
};
}
var (dimensionsNodes, variableDimensionNode) = getArgumentNodes();
AstNode errorNode = variableDimensionNode ?? annotation;
for (int i = 0; i < dimensions.length; i++) {
if (dimensionsNodes case var dimensionsNodes?) {
if (dimensionsNodes.length > i && variableDimensionNode == null) {
var node = dimensionsNodes[i];
errorNode = node is NamedExpression ? node.expression : node;
}
}
// First dimension is variable.
if (i == 0 && variableLength) {
// Variable dimension can't be negative.
if (dimensions[0] < 0) {
_diagnosticReporter.atNode(
errorNode,
FfiCode.NEGATIVE_VARIABLE_DIMENSION,
);
}
continue;
}
if (dimensions[i] <= 0) {
_diagnosticReporter.atNode(
errorNode,
FfiCode.NON_POSITIVE_ARRAY_DIMENSION,
);
}
}
}
/// Validate that the given [typeArgument] has a constant value. Return `true`
/// if a diagnostic was produced because it isn't constant.
bool _validateTypeArgument(TypeAnnotation typeArgument, String functionName) {
if (typeArgument.type is TypeParameterType) {
_diagnosticReporter.atNode(
typeArgument,
FfiCode.NON_CONSTANT_TYPE_ARGUMENT,
arguments: [functionName],
);
return true;
}
return false;
}
}
enum _FfiTypeCheckDirection {
// Passing a value from native code to Dart code. For example, the return type
// of a loaded native function, or the arguments of a native callback.
nativeToDart,
// Passing a value from Dart code to native code. For example, the arguments
// of a loaded native function, or the return type of a native callback.
dartToNative;
_FfiTypeCheckDirection get reverse {
switch (this) {
case nativeToDart:
return dartToNative;
case dartToNative:
return nativeToDart;
}
}
}
enum _PrimitiveDartType { double, int, bool, void_, handle, none }
extension on Annotation {
bool get isAbiSpecificIntegerMapping {
var element = this.element;
return element is ConstructorElement &&
element.ffiClass != null &&
element.enclosingElement.name ==
FfiVerifier._abiSpecificIntegerMappingClassName;
}
bool get isArray {
var element = this.element;
return element is ConstructorElement &&
element.ffiClass != null &&
element.enclosingElement.name == 'Array';
}
bool get isPacked {
var element = this.element;
return element is ConstructorElement &&
element.ffiClass != null &&
element.enclosingElement.name == 'Packed';
}
}
extension on ElementAnnotation {
(List<int>, bool) get arraySizeDimensions {
assert(isArray);
var value = computeConstantValue();
var variableDimension = value?.getField('variableDimension')?.toIntValue();
var variableLength = variableDimension != null;
// Element of `@Array.multi([1, 2, 3])`.
var listField = value?.getField('dimensions');
if (listField != null) {
var listValues =
listField
.toListValue()
?.map((dartValue) => dartValue.toIntValue())
.whereType<int>()
.toList();
if (listValues != null) {
return (
[if (variableLength) variableDimension, ...listValues],
variableLength,
);
}
}
// Element of `@Array(1, 2, 3)`.
const dimensionFieldNames = [
'dimension1',
'dimension2',
'dimension3',
'dimension4',
'dimension5',
];
var result = <int>[];
for (var dimensionFieldName in dimensionFieldNames) {
var dimensionValue = value?.getField(dimensionFieldName)?.toIntValue();
if (dimensionValue != null) {
result.add(dimensionValue);
}
}
return (result, variableLength);
}
bool get isArray {
var element = this.element;
return element is ConstructorElement &&
element.ffiClass != null &&
element.enclosingElement.name == 'Array';
// Note: this is 'Array' instead of '_ArraySize' because it finds the
// forwarding factory instead of the forwarded constructor.
}
/// @Native(isLeaf: true)
bool get isNativeLeaf {
var annotationValue = computeConstantValue();
var annotationType = annotationValue?.type; // Native<T>
if (annotationValue == null || annotationType is! InterfaceType) {
return false;
}
if (!annotationValue.isNative) {
return false;
}
return annotationValue
.getField(FfiVerifier._isLeafParamName)
?.toBoolValue() ??
false;
}
bool get isPacked {
var element = this.element;
return element is ConstructorElement &&
element.ffiClass != null &&
element.enclosingElement.name == 'Packed';
}
int? get packedMemberAlignment {
assert(isPacked);
var value = computeConstantValue();
return value?.getField('memberAlignment')?.toIntValue();
}
}
extension on TopLevelFunctionElement {
/// @Native(isLeaf: true) external function.
bool get isNativeLeaf {
for (var annotation in metadata.annotations) {
if (annotation.isNativeLeaf) {
return true;
}
}
return false;
}
}
extension on MethodElement {
/// @Native(isLeaf: true) external function.
bool get isNativeLeaf {
for (var annotation in metadata.annotations) {
if (annotation.isNativeLeaf) {
return true;
}
}
return false;
}
}
extension on MethodInvocation {
/// Calls @Native(isLeaf: true) external function.
bool get isNativeLeafInvocation {
var element = methodName.element;
if (element is TopLevelFunctionElement) {
return element.isNativeLeaf;
}
if (element is MethodElement) {
return element.isNativeLeaf;
}
return false;
}
}
extension on DartObject {
bool get isDefaultAsset {
return switch (type) {
InterfaceType(:var element) => element.isDefaultAsset,
_ => false,
};
}
bool get isNative {
return switch (type) {
InterfaceType(:var element) => element.isNative,
_ => false,
};
}
}
extension on Element? {
/// If this is a class element from `dart:ffi`, return it.
ClassElement? get ffiClass {
var element = this;
if (element is ConstructorElement) {
element = element.enclosingElement;
}
if (element is ClassElement && element.isFfiClass) {
return element;
}
return null;
}
/// Return `true` if this represents the class `AbiSpecificInteger`.
bool get isAbiSpecificInteger {
var element = this;
return element is ClassElement &&
element.name == FfiVerifier._abiSpecificIntegerClassName &&
element.isFfiClass;
}
/// Return `true` if this represents a subclass of the class
/// `AbiSpecificInteger`.
bool get isAbiSpecificIntegerSubclass {
var element = this;
return element is ClassElement && element.supertype.isAbiSpecificInteger;
}
bool get isAddressOfExtension {
var element = this;
return element is ExtensionElement &&
element.isFfiExtension &&
FfiVerifier._addressOfExtensionNames.contains(element.name);
}
/// Return `true` if this represents the extension `AllocatorAlloc`.
bool get isAllocatorExtension {
var element = this;
return element is ExtensionElement &&
element.name == FfiVerifier._allocatorExtensionName &&
element.isFfiExtension;
}
/// Return `true` if this represents the class `DefaultAsset`.
bool get isDefaultAsset {
var element = this;
return element is ClassElement &&
element.name == 'DefaultAsset' &&
element.isFfiClass;
}
/// Return `true` if this represents the extension `DynamicLibraryExtension`.
bool get isDynamicLibraryExtension {
var element = this;
return element is ExtensionElement &&
element.name == 'DynamicLibraryExtension' &&
element.isFfiExtension;
}
/// Return `true` if this represents the class `Native`.
bool get isNative {
var element = this;
return element is ClassElement &&
element.name == 'Native' &&
element.isFfiClass;
}
/// Return `true` if this represents the class `NativeCallable`.
bool get isNativeCallable {
var element = this;
return element is ClassElement &&
element.name == FfiVerifier._nativeCallable &&
element.isFfiClass;
}
bool get isNativeFunctionPointerExtension {
var element = this;
return element is ExtensionElement &&
element.name == 'NativeFunctionPointer' &&
element.isFfiExtension;
}
bool get isNativeStructArrayExtension {
var element = this;
return element is ExtensionElement &&
element.name == 'StructArray' &&
element.isFfiExtension;
}
bool get isNativeStructPointerExtension {
var element = this;
return element is ExtensionElement &&
element.name == 'StructPointer' &&
element.isFfiExtension;
}
bool get isNativeUnionArrayExtension {
var element = this;
return element is ExtensionElement &&
element.name == 'UnionArray' &&
element.isFfiExtension;
}
bool get isNativeUnionPointerExtension {
var element = this;
return element is ExtensionElement &&
element.name == 'UnionPointer' &&
element.isFfiExtension;
}
/// Return `true` if this represents the class `Opaque`.
bool get isOpaque {
var element = this;
return element is ClassElement &&
element.name == FfiVerifier._opaqueClassName &&
element.isFfiClass;
}
/// Return `true` if this represents the class `Pointer`.
bool get isPointer {
var element = this;
return element is ClassElement &&
element.name == 'Pointer' &&
element.isFfiClass;
}
/// Return `true` if this represents the class `Struct`.
bool get isStruct {
var element = this;
return element is ClassElement &&
element.name == 'Struct' &&
element.isFfiClass;
}
/// Return `true` if this represents a subclass of the class `Struct`.
bool get isStructSubclass {
var element = this;
return element is ClassElement && element.supertype.isStruct;
}
/// Return `true` if this represents the class `Union`.
bool get isUnion {
var element = this;
return element is ClassElement &&
element.name == 'Union' &&
element.isFfiClass;
}
/// Return `true` if this represents a subclass of the class `Union`.
bool get isUnionSubclass {
var element = this;
return element is ClassElement && element.supertype.isUnion;
}
}
extension on InterfaceElement {
bool get isEmptyStruct {
for (var field in fields) {
var declaredType = field.type;
if (declaredType.isDartCoreInt) {
return false;
} else if (declaredType.isDartCoreDouble) {
return false;
} else if (declaredType.isDartCoreBool) {
return false;
} else if (declaredType.isPointer) {
return false;
} else if (declaredType.isCompoundSubtype) {
return false;
} else if (declaredType.isArray) {
return false;
}
}
return true;
}
bool get isFfiClass {
return library.name == FfiVerifier._dartFfiLibraryName;
}
bool get isTypedDataClass {
return library.name == FfiVerifier._dartTypedDataLibraryName;
}
}
extension on ExtensionElement {
bool get isFfiExtension {
return library.name == FfiVerifier._dartFfiLibraryName;
}
}
extension on DartType? {
bool get isAbiSpecificInteger {
var self = this;
return self is InterfaceType && self.element.isAbiSpecificInteger;
}
bool get isStruct {
var self = this;
return self is InterfaceType && self.element.isStruct;
}
bool get isUnion {
var self = this;
return self is InterfaceType && self.element.isUnion;
}
}
extension on DartType {
int get arrayDimensions {
DartType iterator = this;
int dimensions = 0;
while (iterator is InterfaceType &&
iterator.element.name == FfiVerifier._arrayClassName &&
iterator.element.isFfiClass) {
dimensions++;
iterator = iterator.typeArguments.single;
}
return dimensions;
}
bool get isAbiSpecificInteger {
var self = this;
if (self is InterfaceType) {
var element = self.element;
var name = element.name;
return name == FfiVerifier._abiSpecificIntegerClassName &&
element.isFfiClass;
}
return false;
}
/// Returns `true` iff this is an Abi-specific integer type,
/// i.e. a subtype of `AbiSpecificInteger`.
bool get isAbiSpecificIntegerSubtype {
var self = this;
if (self is InterfaceType) {
var superType = self.element.supertype;
if (superType != null) {
var superClassElement = superType.element;
return superClassElement.name ==
FfiVerifier._abiSpecificIntegerClassName &&
superClassElement.isFfiClass;
}
}
return false;
}
/// Return `true` if this represents the class `Array`.
bool get isArray {
var self = this;
if (self is InterfaceType) {
var element = self.element;
return element.name == FfiVerifier._arrayClassName && element.isFfiClass;
}
return false;
}
bool get isCompound {
var self = this;
if (self is InterfaceType) {
var element = self.element;
var name = element.name;
return (name == FfiVerifier._structClassName ||
name == FfiVerifier._unionClassName) &&
element.isFfiClass;
}
return false;
}
/// Returns `true` if this is a struct type, i.e. a subtype of `Struct`.
bool get isCompoundSubtype {
var self = this;
if (self is InterfaceType) {
var superType = self.element.supertype;
if (superType != null) {
return superType.isCompound;
}
}
return false;
}
bool get isHandle {
var self = this;
if (self is InterfaceType) {
var element = self.element;
return element.name == 'Handle' && element.isFfiClass;
}
return false;
}
/// Returns `true` iff this is a `ffi.NativeFunction<???>` type.
bool get isNativeFunction {
var self = this;
if (self is InterfaceType) {
var element = self.element;
return element.name == 'NativeFunction' && element.isFfiClass;
}
return false;
}
/// Returns `true` iff this is a `ffi.NativeType` type.
bool get isNativeType {
var self = this;
if (self is InterfaceType) {
var element = self.element;
return element.name == 'NativeType' && element.isFfiClass;
}
return false;
}
bool get isOpaque {
var self = this;
return self is InterfaceType && self.element.isOpaque;
}
/// Returns `true` iff this is a opaque type, i.e. a subtype of `Opaque`.
bool get isOpaqueSubtype {
var self = this;
if (self is InterfaceType) {
var superType = self.element.supertype;
if (superType != null) {
return superType.element.isOpaque;
}
}
return false;
}
bool get isPointer {
var self = this;
return self is InterfaceType && self.element.isPointer;
}
/// Only the subset of typed data classes that correspond to a Pointer.
bool get isTypedData {
var self = this;
if (self is! InterfaceType) {
return false;
}
if (!self.element.isTypedDataClass) {
return false;
}
var elementName = self.element.name!;
if (!elementName.endsWith('List')) {
return false;
}
if (elementName == 'Float32List' || elementName == 'Float64List') {
return true;
}
var fixedIntegerTypeName = elementName.replaceAll('List', '');
return FfiVerifier._primitiveIntegerNativeTypesFixedSize.contains(
fixedIntegerTypeName,
);
}
/// Returns `true` iff this is a `ffi.VarArgs` type.
bool get isVarArgs {
var self = this;
if (self is InterfaceType) {
var element = self.element;
return element.name == 'VarArgs' && element.isFfiClass;
}
return false;
}
}
extension on NamedType {
/// If this is a name of class from `dart:ffi`, return it.
ClassElement? get ffiClass {
return element.ffiClass;
}
/// Return `true` if this represents a subtype of `Struct` or `Union`.
bool get isAbiSpecificIntegerSubtype {
var element = this.element;
if (element is ClassElement) {
return element.allSupertypes.any((e) => e.isAbiSpecificInteger);
}
return false;
}
/// Return `true` if this represents a subtype of `Struct` or `Union`.
bool get isCompoundSubtype {
var element = this.element;
if (element is ClassElement) {
return element.allSupertypes.any((e) => e.isCompound);
}
return false;
}
}
extension on List<TypeImpl> {
/// Removes the VarArgs from a DartType list.
///
/// ```
/// [Int8, Int8] -> [Int8, Int8]
/// [Int8, VarArgs<(Int8,)>] -> [Int8, Int8]
/// [Int8, VarArgs<(Int8, Int8)>] -> [Int8, Int8, Int8]
/// ```
List<TypeImpl> flattenVarArgs() {
if (isEmpty) {
return this;
}
var last = this.last;
if (!last.isVarArgs) {
return this;
}
var typeArgument = (last as InterfaceTypeImpl).typeArguments.single;
if (typeArgument is! RecordTypeImpl) {
return this;
}
if (typeArgument.namedFields.isNotEmpty) {
// Don't flatten if invalid record.
return this;
}
return [
...take(length - 1),
for (var field in typeArgument.positionalFields) field.type,
];
}
}