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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 library analyzer.src.generated.resolver; | 5 library analyzer.src.generated.resolver; |
6 | 6 |
7 import 'dart:collection'; | 7 import 'dart:collection'; |
8 | 8 |
9 import 'package:analyzer/dart/ast/ast.dart'; | 9 import 'package:analyzer/dart/ast/ast.dart'; |
10 import 'package:analyzer/dart/ast/token.dart'; | 10 import 'package:analyzer/dart/ast/token.dart'; |
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4682 * of all return statements in a lambda. | 4682 * of all return statements in a lambda. |
4683 * | 4683 * |
4684 * This will always be kept in sync with [_returnStack]. | 4684 * This will always be kept in sync with [_returnStack]. |
4685 */ | 4685 */ |
4686 final List<DartType> _inferredReturn = <DartType>[]; | 4686 final List<DartType> _inferredReturn = <DartType>[]; |
4687 | 4687 |
4688 /** | 4688 /** |
4689 * A stack of return types for all of the enclosing | 4689 * A stack of return types for all of the enclosing |
4690 * functions and methods. | 4690 * functions and methods. |
4691 */ | 4691 */ |
4692 // TODO(leafp) Handle the implicit union type for Futures | |
4693 // https://github.com/dart-lang/sdk/issues/25322 | |
4694 final List<DartType> _returnStack = <DartType>[]; | 4692 final List<DartType> _returnStack = <DartType>[]; |
4695 | 4693 |
4696 InferenceContext._(this._errorReporter, TypeProvider typeProvider, | 4694 InferenceContext._(this._errorReporter, TypeProvider typeProvider, |
4697 this._typeSystem, this._inferenceHints) | 4695 this._typeSystem, this._inferenceHints) |
4698 : _typeProvider = typeProvider; | 4696 : _typeProvider = typeProvider; |
4699 | 4697 |
4700 /** | 4698 /** |
4701 * Get the return type of the current enclosing function, if any. | 4699 * Get the return type of the current enclosing function, if any. |
4702 * | 4700 * |
4703 * The type returned for a function is the type that is expected | 4701 * The type returned for a function is the type that is expected |
4704 * to be used in a return or yield context. For ordinary functions | 4702 * to be used in a return or yield context. For ordinary functions |
4705 * this is the same as the return type of the function. For async | 4703 * this is the same as the return type of the function. For async |
4706 * functions returning Future<T> and for generator functions | 4704 * functions returning Future<T> and for generator functions |
4707 * returning Stream<T> or Iterable<T>, this is T. | 4705 * returning Stream<T> or Iterable<T>, this is T. |
4708 */ | 4706 */ |
4709 DartType get returnContext => | 4707 DartType get returnContext => |
4710 _returnStack.isNotEmpty ? _returnStack.last : null; | 4708 _returnStack.isNotEmpty ? _returnStack.last : null; |
4711 | 4709 |
4712 /** | 4710 /** |
4713 * Records the type of the expression of a return statement. | 4711 * Records the type of the expression of a return statement. |
4714 * | 4712 * |
4715 * This will be used for inferring a block bodied lambda, if no context | 4713 * This will be used for inferring a block bodied lambda, if no context |
4716 * type was available. | 4714 * type was available. |
4717 */ | 4715 */ |
4718 void addReturnOrYieldType(DartType type) { | 4716 void addReturnOrYieldType(DartType type) { |
4719 if (_returnStack.isEmpty) { | 4717 if (_returnStack.isEmpty) { |
4720 return; | 4718 return; |
4721 } | 4719 } |
4722 DartType context = _returnStack.last; | 4720 DartType context = _returnStack.last; |
4723 if (context == null || context.isDynamic) { | 4721 if (context == null || context is DartType && context.isDynamic) { |
vsm
2016/08/09 20:29:33
Why "context is DartType"? That's the static type
Jennifer Messerly
2016/08/09 20:56:57
Good catch. Holdover from the earlier design when
| |
4724 DartType inferred = _inferredReturn.last; | 4722 DartType inferred = _inferredReturn.last; |
4725 inferred = _typeSystem.getLeastUpperBound(_typeProvider, type, inferred); | 4723 inferred = _typeSystem.getLeastUpperBound(_typeProvider, inferred, type); |
vsm
2016/08/09 20:29:33
Does the order actually matter?
Jennifer Messerly
2016/08/09 20:56:57
no. it got swapped because I had removed and recon
| |
4726 _inferredReturn[_inferredReturn.length - 1] = inferred; | 4724 _inferredReturn[_inferredReturn.length - 1] = inferred; |
4727 } | 4725 } |
4728 } | 4726 } |
4729 | 4727 |
4730 /** | 4728 /** |
4731 * Match type [t1] against type [t2] as follows. | 4729 * Match type [t1] against type [t2] as follows. |
4732 * If `t1 = I<dynamic, ..., dynamic>`, then look for a supertype | 4730 * If `t1 = I<dynamic, ..., dynamic>`, then look for a supertype |
4733 * of t1 of the form `K<S0, ..., Sm>` where `t2 = K<S0', ..., Sm'>` | 4731 * of t1 of the form `K<S0, ..., Sm>` where `t2 = K<S0', ..., Sm'>` |
4734 * If the supertype exists, use the constraints `S0 <: S0', ... Sm <: Sm'` | 4732 * If the supertype exists, use the constraints `S0 <: S0', ... Sm <: Sm'` |
4735 * to derive a concrete instantation for I of the form `<T0, ..., Tn>`, | 4733 * to derive a concrete instantation for I of the form `<T0, ..., Tn>`, |
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4755 if (!inferred.isBottom) { | 4753 if (!inferred.isBottom) { |
4756 setType(node, inferred); | 4754 setType(node, inferred); |
4757 } | 4755 } |
4758 } | 4756 } |
4759 } | 4757 } |
4760 | 4758 |
4761 /** | 4759 /** |
4762 * Push a block function body's return type onto the return stack. | 4760 * Push a block function body's return type onto the return stack. |
4763 */ | 4761 */ |
4764 void pushReturnContext(BlockFunctionBody node) { | 4762 void pushReturnContext(BlockFunctionBody node) { |
4765 DartType returnType = getType(node); | 4763 _returnStack.add(getContext(node)); |
4766 _returnStack.add(returnType); | |
4767 _inferredReturn.add(BottomTypeImpl.instance); | 4764 _inferredReturn.add(BottomTypeImpl.instance); |
4768 } | 4765 } |
4769 | 4766 |
4770 /** | 4767 /** |
4771 * Place an info node into the error stream indicating that a | 4768 * Place an info node into the error stream indicating that a |
4772 * [type] has been inferred as the type of [node]. | 4769 * [type] has been inferred as the type of [node]. |
4773 */ | 4770 */ |
4774 void recordInference(Expression node, DartType type) { | 4771 void recordInference(Expression node, DartType type) { |
4775 if (!_inferenceHints) { | 4772 if (!_inferenceHints) { |
4776 return; | 4773 return; |
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4898 } | 4895 } |
4899 | 4896 |
4900 /** | 4897 /** |
4901 * Clear the type information assocated with [node]. | 4898 * Clear the type information assocated with [node]. |
4902 */ | 4899 */ |
4903 static void clearType(AstNode node) { | 4900 static void clearType(AstNode node) { |
4904 node?.setProperty(_typeProperty, null); | 4901 node?.setProperty(_typeProperty, null); |
4905 } | 4902 } |
4906 | 4903 |
4907 /** | 4904 /** |
4905 * Look for a single contextual type attached to [node], and returns the type | |
4906 * if found, otherwise null. | |
4907 * | |
4908 * If [node] has a contextual union type like `T | Future<T>` this will | |
4909 * simplify it to only return `T`. If the caller can handle a union type, | |
4910 * [getContext] should be used instead. | |
4911 */ | |
4912 static DartType getType(AstNode node) { | |
4913 DartType t = getContext(node); | |
4914 if (t is FutureUnionType) { | |
4915 return t.type; | |
4916 } | |
4917 return t; | |
4918 } | |
4919 | |
4920 /** | |
4908 * Look for contextual type information attached to [node]. Returns | 4921 * Look for contextual type information attached to [node]. Returns |
4909 * the type if found, otherwise null. | 4922 * the type if found, otherwise null. |
4923 * | |
4924 * If [node] has a contextual union type like `T | Future<T>` this will be | |
4925 * returned. You can use [getType] if you prefer to only get the `T`. | |
4910 */ | 4926 */ |
4911 static DartType getType(AstNode node) => node?.getProperty(_typeProperty); | 4927 static DartType getContext(AstNode node) => node?.getProperty(_typeProperty); |
4928 | |
4929 /** | |
4930 * Like [getContext] but expands a union type into a list of types. | |
4931 */ | |
4932 static Iterable<DartType> getTypes(AstNode node) { | |
4933 DartType t = getContext(node); | |
4934 if (t == null) { | |
4935 return DartType.EMPTY_LIST; | |
4936 } | |
4937 if (t is FutureUnionType) { | |
4938 return t.types; | |
4939 } | |
4940 return <DartType>[t]; | |
4941 } | |
4912 | 4942 |
4913 /** | 4943 /** |
4914 * Attach contextual type information [type] to [node] for use during | 4944 * Attach contextual type information [type] to [node] for use during |
4915 * inference. | 4945 * inference. |
4916 */ | 4946 */ |
4917 static void setType(AstNode node, DartType type) { | 4947 static void setType(AstNode node, DartType type) { |
4918 // TODO(jmesserly): this sets the type even when it's dynamic. | |
4919 // Can we skip that? | |
4920 node?.setProperty(_typeProperty, type); | 4948 node?.setProperty(_typeProperty, type); |
4921 } | 4949 } |
4922 | 4950 |
4923 /** | 4951 /** |
4924 * Attach contextual type information [type] to [node] for use during | 4952 * Attach contextual type information [type] to [node] for use during |
4925 * inference. | 4953 * inference. |
4926 */ | 4954 */ |
4927 static void setTypeFromNode(AstNode innerNode, AstNode outerNode) { | 4955 static void setTypeFromNode(AstNode innerNode, AstNode outerNode) { |
4928 setType(innerNode, getType(outerNode)); | 4956 setType(innerNode, getContext(outerNode)); |
4929 } | 4957 } |
4930 } | 4958 } |
4931 | 4959 |
4932 /** | 4960 /** |
4933 * This enum holds one of four states of a field initialization state through a constructor | 4961 * This enum holds one of four states of a field initialization state through a constructor |
4934 * signature, not initialized, initialized in the field declaration, initialized in the field | 4962 * signature, not initialized, initialized in the field declaration, initialized in the field |
4935 * formal, and finally, initialized in the initializers list. | 4963 * formal, and finally, initialized in the initializers list. |
4936 */ | 4964 */ |
4937 class INIT_STATE extends Enum<INIT_STATE> { | 4965 class INIT_STATE extends Enum<INIT_STATE> { |
4938 static const INIT_STATE NOT_INIT = const INIT_STATE('NOT_INIT', 0); | 4966 static const INIT_STATE NOT_INIT = const INIT_STATE('NOT_INIT', 0); |
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6002 node.rightHandSide, node.leftHandSide.staticType); | 6030 node.rightHandSide, node.leftHandSide.staticType); |
6003 } | 6031 } |
6004 node.rightHandSide?.accept(this); | 6032 node.rightHandSide?.accept(this); |
6005 node.accept(elementResolver); | 6033 node.accept(elementResolver); |
6006 node.accept(typeAnalyzer); | 6034 node.accept(typeAnalyzer); |
6007 return null; | 6035 return null; |
6008 } | 6036 } |
6009 | 6037 |
6010 @override | 6038 @override |
6011 Object visitAwaitExpression(AwaitExpression node) { | 6039 Object visitAwaitExpression(AwaitExpression node) { |
6012 // TODO(leafp): Handle the implicit union type here | 6040 DartType contextType = InferenceContext.getContext(node); |
6013 // https://github.com/dart-lang/sdk/issues/25322 | |
6014 DartType contextType = InferenceContext.getType(node); | |
6015 if (contextType != null) { | 6041 if (contextType != null) { |
6016 InterfaceType futureT = typeProvider.futureType | 6042 var futureUnion = |
6017 .instantiate([contextType.flattenFutures(typeSystem)]); | 6043 FutureUnionType.from(contextType, typeProvider, typeSystem); |
6018 InferenceContext.setType(node.expression, futureT); | 6044 InferenceContext.setType(node.expression, futureUnion); |
6019 } | 6045 } |
6020 return super.visitAwaitExpression(node); | 6046 return super.visitAwaitExpression(node); |
6021 } | 6047 } |
6022 | 6048 |
6023 @override | 6049 @override |
6024 Object visitBinaryExpression(BinaryExpression node) { | 6050 Object visitBinaryExpression(BinaryExpression node) { |
6025 TokenType operatorType = node.operator.type; | 6051 TokenType operatorType = node.operator.type; |
6026 Expression leftOperand = node.leftOperand; | 6052 Expression leftOperand = node.leftOperand; |
6027 Expression rightOperand = node.rightOperand; | 6053 Expression rightOperand = node.rightOperand; |
6028 if (operatorType == TokenType.AMPERSAND_AMPERSAND) { | 6054 if (operatorType == TokenType.AMPERSAND_AMPERSAND) { |
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6062 } else { | 6088 } else { |
6063 // TODO(leafp): Do downwards inference using the declared type | 6089 // TODO(leafp): Do downwards inference using the declared type |
6064 // of the binary operator for other cases. | 6090 // of the binary operator for other cases. |
6065 if (operatorType == TokenType.QUESTION_QUESTION) { | 6091 if (operatorType == TokenType.QUESTION_QUESTION) { |
6066 InferenceContext.setTypeFromNode(leftOperand, node); | 6092 InferenceContext.setTypeFromNode(leftOperand, node); |
6067 } | 6093 } |
6068 leftOperand?.accept(this); | 6094 leftOperand?.accept(this); |
6069 if (operatorType == TokenType.QUESTION_QUESTION) { | 6095 if (operatorType == TokenType.QUESTION_QUESTION) { |
6070 // Set the right side, either from the context, or using the information | 6096 // Set the right side, either from the context, or using the information |
6071 // from the left side if it is more precise. | 6097 // from the left side if it is more precise. |
6072 DartType contextType = InferenceContext.getType(node); | 6098 DartType contextType = InferenceContext.getContext(node); |
6073 DartType leftType = leftOperand?.staticType; | 6099 DartType leftType = leftOperand?.staticType; |
6074 if (contextType == null || contextType.isDynamic) { | 6100 if (contextType == null || contextType.isDynamic) { |
6075 contextType = leftType; | 6101 contextType = leftType; |
6076 } | 6102 } |
6077 InferenceContext.setType(rightOperand, contextType); | 6103 InferenceContext.setType(rightOperand, contextType); |
6078 } | 6104 } |
6079 rightOperand?.accept(this); | 6105 rightOperand?.accept(this); |
6080 } | 6106 } |
6081 node.accept(elementResolver); | 6107 node.accept(elementResolver); |
6082 node.accept(typeAnalyzer); | 6108 node.accept(typeAnalyzer); |
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6540 _currentFunctionBody = node.body; | 6566 _currentFunctionBody = node.body; |
6541 _enclosingFunction = node.element; | 6567 _enclosingFunction = node.element; |
6542 _overrideManager.enterScope(); | 6568 _overrideManager.enterScope(); |
6543 try { | 6569 try { |
6544 DartType functionType = InferenceContext.getType(node); | 6570 DartType functionType = InferenceContext.getType(node); |
6545 if (functionType is FunctionType) { | 6571 if (functionType is FunctionType) { |
6546 functionType = | 6572 functionType = |
6547 matchFunctionTypeParameters(node.typeParameters, functionType); | 6573 matchFunctionTypeParameters(node.typeParameters, functionType); |
6548 if (functionType is FunctionType) { | 6574 if (functionType is FunctionType) { |
6549 _inferFormalParameterList(node.parameters, functionType); | 6575 _inferFormalParameterList(node.parameters, functionType); |
6550 DartType returnType = | 6576 |
6551 _computeReturnOrYieldType(functionType.returnType); | 6577 DartType returnType; |
6578 if (_isFutureThenLambda(node)) { | |
6579 var futureThenType = | |
6580 InferenceContext.getContext(node.parent) as FunctionType; | |
6581 | |
6582 // Pretend the return type of Future<T>.then<S> first parameter is | |
6583 // | |
6584 // T -> (S | Future<S>) | |
6585 // | |
6586 // We can't represent this in Dart so we populate it here during | |
6587 // inference. | |
6588 returnType = FutureUnionType.from( | |
6589 futureThenType.returnType, typeProvider, typeSystem); | |
6590 } else { | |
6591 returnType = _computeReturnOrYieldType(functionType.returnType); | |
6592 } | |
6593 | |
6552 InferenceContext.setType(node.body, returnType); | 6594 InferenceContext.setType(node.body, returnType); |
6553 } | 6595 } |
6554 } | 6596 } |
6555 super.visitFunctionExpression(node); | 6597 super.visitFunctionExpression(node); |
6556 } finally { | 6598 } finally { |
6557 _overrideManager.exitScope(); | 6599 _overrideManager.exitScope(); |
6558 } | 6600 } |
6559 } finally { | 6601 } finally { |
6560 _currentFunctionBody = outerFunctionBody; | 6602 _currentFunctionBody = outerFunctionBody; |
6561 _enclosingFunction = outerFunction; | 6603 _enclosingFunction = outerFunction; |
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6657 perBranchOverrides.add(elseOverrides); | 6699 perBranchOverrides.add(elseOverrides); |
6658 _overrideManager.mergeOverrides(perBranchOverrides); | 6700 _overrideManager.mergeOverrides(perBranchOverrides); |
6659 } | 6701 } |
6660 return null; | 6702 return null; |
6661 } | 6703 } |
6662 | 6704 |
6663 @override | 6705 @override |
6664 Object visitInstanceCreationExpression(InstanceCreationExpression node) { | 6706 Object visitInstanceCreationExpression(InstanceCreationExpression node) { |
6665 TypeName classTypeName = node.constructorName.type; | 6707 TypeName classTypeName = node.constructorName.type; |
6666 if (classTypeName.typeArguments == null) { | 6708 if (classTypeName.typeArguments == null) { |
6667 DartType contextType = InferenceContext.getType(node); | 6709 // Given a union of context types ` T0 | T1 | ... | Tn`, find the first |
6668 if (contextType is InterfaceType && | 6710 // valid instantiation `new C<Ti>`, if it exists. |
6669 contextType.typeArguments != null && | 6711 // TODO(jmesserly): if we support union types for real, `new C<Ti | Tj>` |
6670 contextType.typeArguments.length > 0) { | 6712 // will become a valid possibility. Right now the only allowed union is |
6671 // TODO(jmesserly): for generic methods we use the | 6713 // `T | Future<T>` so we can take a simple approach. |
6672 // StrongTypeSystemImpl.inferGenericFunctionCall, which appears to | 6714 for (var contextType in InferenceContext.getTypes(node)) { |
6673 // be a tad more powerful than matchTypes. | 6715 if (contextType is InterfaceType && |
6674 // | 6716 contextType.typeArguments != null && |
6675 // For example it can infer this case: | 6717 contextType.typeArguments.isNotEmpty) { |
6676 // | 6718 // TODO(jmesserly): for generic methods we use the |
6677 // class E<S, T> extends A<C<S>, T> { ... } | 6719 // StrongTypeSystemImpl.inferGenericFunctionCall, which appears to |
6678 // A<C<int>, String> a0 = /*infer<int, String>*/new E("hello"); | 6720 // be a tad more powerful than matchTypes. |
6679 // | 6721 // |
6680 // See _inferArgumentTypesFromContext in this file for use of it. | 6722 // For example it can infer this case: |
6681 List<DartType> targs = | 6723 // |
6682 inferenceContext.matchTypes(classTypeName.type, contextType); | 6724 // class E<S, T> extends A<C<S>, T> { ... } |
6683 if (targs != null && targs.any((t) => !t.isDynamic)) { | 6725 // A<C<int>, String> a0 = /*infer<int, String>*/new E("hello"); |
6684 ClassElement classElement = classTypeName.type.element; | 6726 // |
6685 InterfaceType rawType = classElement.type; | 6727 // See _inferArgumentTypesFromContext in this file for use of it. |
6686 InterfaceType fullType = | 6728 List<DartType> targs = |
6687 rawType.substitute2(targs, rawType.typeArguments); | 6729 inferenceContext.matchTypes(classTypeName.type, contextType); |
6688 // The element resolver uses the type on the constructor name, so | 6730 if (targs != null && targs.any((t) => !t.isDynamic)) { |
6689 // infer it first | 6731 ClassElement classElement = classTypeName.type.element; |
6690 typeAnalyzer.inferConstructorName(node.constructorName, fullType); | 6732 InterfaceType rawType = classElement.type; |
6733 InterfaceType fullType = | |
6734 rawType.substitute2(targs, rawType.typeArguments); | |
6735 // The element resolver uses the type on the constructor name, so | |
6736 // infer it first | |
6737 typeAnalyzer.inferConstructorName(node.constructorName, fullType); | |
6738 break; | |
6739 } | |
6691 } | 6740 } |
6692 } | 6741 } |
6693 } | 6742 } |
6694 node.constructorName?.accept(this); | 6743 node.constructorName?.accept(this); |
6695 FunctionType constructorType = node.constructorName.staticElement?.type; | 6744 FunctionType constructorType = node.constructorName.staticElement?.type; |
6696 if (constructorType != null) { | 6745 if (constructorType != null) { |
6697 InferenceContext.setType(node.argumentList, constructorType); | 6746 InferenceContext.setType(node.argumentList, constructorType); |
6698 } | 6747 } |
6699 node.argumentList?.accept(this); | 6748 node.argumentList?.accept(this); |
6700 node.accept(elementResolver); | 6749 node.accept(elementResolver); |
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6794 node.typeArguments?.accept(this); | 6843 node.typeArguments?.accept(this); |
6795 node.accept(elementResolver); | 6844 node.accept(elementResolver); |
6796 _inferArgumentTypesFromContext(node); | 6845 _inferArgumentTypesFromContext(node); |
6797 node.argumentList?.accept(this); | 6846 node.argumentList?.accept(this); |
6798 node.accept(typeAnalyzer); | 6847 node.accept(typeAnalyzer); |
6799 return null; | 6848 return null; |
6800 } | 6849 } |
6801 | 6850 |
6802 @override | 6851 @override |
6803 Object visitNamedExpression(NamedExpression node) { | 6852 Object visitNamedExpression(NamedExpression node) { |
6804 InferenceContext.setType(node.expression, InferenceContext.getType(node)); | 6853 InferenceContext.setTypeFromNode(node.expression, node); |
6805 return super.visitNamedExpression(node); | 6854 return super.visitNamedExpression(node); |
6806 } | 6855 } |
6807 | 6856 |
6808 @override | 6857 @override |
6809 Object visitNode(AstNode node) { | 6858 Object visitNode(AstNode node) { |
6810 node.visitChildren(this); | 6859 node.visitChildren(this); |
6811 node.accept(elementResolver); | 6860 node.accept(elementResolver); |
6812 node.accept(typeAnalyzer); | 6861 node.accept(typeAnalyzer); |
6813 return null; | 6862 return null; |
6814 } | 6863 } |
6815 | 6864 |
6816 @override | 6865 @override |
6817 Object visitParenthesizedExpression(ParenthesizedExpression node) { | 6866 Object visitParenthesizedExpression(ParenthesizedExpression node) { |
6818 InferenceContext.setType(node.expression, InferenceContext.getType(node)); | 6867 InferenceContext.setTypeFromNode(node.expression, node); |
6819 return super.visitParenthesizedExpression(node); | 6868 return super.visitParenthesizedExpression(node); |
6820 } | 6869 } |
6821 | 6870 |
6822 @override | 6871 @override |
6823 Object visitPrefixedIdentifier(PrefixedIdentifier node) { | 6872 Object visitPrefixedIdentifier(PrefixedIdentifier node) { |
6824 // | 6873 // |
6825 // We visit the prefix, but do not visit the identifier because it needs to | 6874 // We visit the prefix, but do not visit the identifier because it needs to |
6826 // be visited in the context of the prefix. | 6875 // be visited in the context of the prefix. |
6827 // | 6876 // |
6828 node.prefix?.accept(this); | 6877 node.prefix?.accept(this); |
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6926 _overrideManager.applyOverrides(overrides); | 6975 _overrideManager.applyOverrides(overrides); |
6927 } | 6976 } |
6928 return null; | 6977 return null; |
6929 } | 6978 } |
6930 | 6979 |
6931 @override | 6980 @override |
6932 Object visitTypeName(TypeName node) => null; | 6981 Object visitTypeName(TypeName node) => null; |
6933 | 6982 |
6934 @override | 6983 @override |
6935 Object visitVariableDeclaration(VariableDeclaration node) { | 6984 Object visitVariableDeclaration(VariableDeclaration node) { |
6936 InferenceContext.setType(node.initializer, InferenceContext.getType(node)); | 6985 InferenceContext.setTypeFromNode(node.initializer, node); |
6937 super.visitVariableDeclaration(node); | 6986 super.visitVariableDeclaration(node); |
6938 VariableElement element = node.element; | 6987 VariableElement element = node.element; |
6939 if (element.initializer != null && node.initializer != null) { | 6988 if (element.initializer != null && node.initializer != null) { |
6940 (element.initializer as FunctionElementImpl).returnType = | 6989 (element.initializer as FunctionElementImpl).returnType = |
6941 node.initializer.staticType; | 6990 node.initializer.staticType; |
6942 } | 6991 } |
6943 // Note: in addition to cloning the initializers for const variables, we | 6992 // Note: in addition to cloning the initializers for const variables, we |
6944 // have to clone the initializers for non-static final fields (because if | 6993 // have to clone the initializers for non-static final fields (because if |
6945 // they occur in a class with a const constructor, they will be needed to | 6994 // they occur in a class with a const constructor, they will be needed to |
6946 // evaluate the const constructor). | 6995 // evaluate the const constructor). |
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7070 * cannot be computed from the declared return type, return null. | 7119 * cannot be computed from the declared return type, return null. |
7071 */ | 7120 */ |
7072 DartType _computeReturnOrYieldType(DartType declaredType) { | 7121 DartType _computeReturnOrYieldType(DartType declaredType) { |
7073 bool isGenerator = _enclosingFunction.isGenerator; | 7122 bool isGenerator = _enclosingFunction.isGenerator; |
7074 bool isAsynchronous = _enclosingFunction.isAsynchronous; | 7123 bool isAsynchronous = _enclosingFunction.isAsynchronous; |
7075 | 7124 |
7076 // Ordinary functions just return their declared types. | 7125 // Ordinary functions just return their declared types. |
7077 if (!isGenerator && !isAsynchronous) { | 7126 if (!isGenerator && !isAsynchronous) { |
7078 return declaredType; | 7127 return declaredType; |
7079 } | 7128 } |
7080 if (isGenerator) { | 7129 if (declaredType is InterfaceType) { |
7081 if (declaredType is! InterfaceType) { | 7130 if (isGenerator) { |
7082 return null; | 7131 // If it's sync* we expect Iterable<T> |
7132 // IF it's async* we expect Stream<T> | |
vsm
2016/08/09 20:29:33
IF -> If
Jennifer Messerly
2016/08/09 20:56:57
Done.
| |
7133 InterfaceType rawType = isAsynchronous | |
7134 ? typeProvider.streamDynamicType | |
7135 : typeProvider.iterableDynamicType; | |
7136 // Match the types to instantiate the type arguments if possible | |
7137 List<DartType> typeArgs = | |
7138 inferenceContext.matchTypes(rawType, declaredType); | |
7139 return (typeArgs?.length == 1) ? typeArgs[0] : null; | |
7083 } | 7140 } |
7084 // If it's synchronous, we expect Iterable<T>, otherwise Stream<T> | 7141 // async functions expect `Future<T> | T` |
7085 InterfaceType rawType = isAsynchronous | 7142 return new FutureUnionType(declaredType, typeProvider, typeSystem); |
7086 ? typeProvider.streamDynamicType | |
7087 : typeProvider.iterableDynamicType; | |
7088 // Match the types to instantiate the type arguments if possible | |
7089 List<DartType> typeArgs = | |
7090 inferenceContext.matchTypes(rawType, declaredType); | |
7091 return (typeArgs?.length == 1) ? typeArgs[0] : null; | |
7092 } | 7143 } |
7093 // Must be asynchronous to reach here, so strip off any layers of Future | 7144 return declaredType; |
7094 return declaredType.flattenFutures(typeSystem); | |
7095 } | 7145 } |
7096 | 7146 |
7097 /** | 7147 /** |
7098 * The given expression is the expression used to compute the iterator for a | 7148 * The given expression is the expression used to compute the iterator for a |
7099 * for-each statement. Attempt to compute the type of objects that will be | 7149 * for-each statement. Attempt to compute the type of objects that will be |
7100 * assigned to the loop variable and return that type. Return `null` if the | 7150 * assigned to the loop variable and return that type. Return `null` if the |
7101 * type could not be determined. The [iteratorExpression] is the expression | 7151 * type could not be determined. The [iteratorExpression] is the expression |
7102 * that will return the Iterable being iterated over. | 7152 * that will return the Iterable being iterated over. |
7103 */ | 7153 */ |
7104 DartType _getIteratorElementType(Expression iteratorExpression) { | 7154 DartType _getIteratorElementType(Expression iteratorExpression) { |
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7315 // | 7365 // |
7316 // Unsound to assume that [x = "hello";] never executed after the | 7366 // Unsound to assume that [x = "hello";] never executed after the |
7317 // if-statement. Of course, a dead-code analysis could point out that | 7367 // if-statement. Of course, a dead-code analysis could point out that |
7318 // [return] here is dead. | 7368 // [return] here is dead. |
7319 return _isAbruptTerminationStatement(statements[size - 1]); | 7369 return _isAbruptTerminationStatement(statements[size - 1]); |
7320 } | 7370 } |
7321 return false; | 7371 return false; |
7322 } | 7372 } |
7323 | 7373 |
7324 /** | 7374 /** |
7375 * Returns true if this expression is being passed to `Future.then`. | |
7376 * | |
7377 * If so we will apply special typing rules in strong mode, to handle the | |
7378 * implicit union of `S | Future<S>` | |
7379 */ | |
7380 bool _isFutureThenLambda(FunctionExpression node) { | |
7381 Element element = node.staticParameterElement?.enclosingElement; | |
7382 return element is MethodElement && | |
7383 element.name == 'then' && | |
7384 element.enclosingElement.type.isDartAsyncFuture; | |
7385 } | |
7386 | |
7387 /** | |
7325 * Return `true` if the given variable is accessed within a closure in the giv en | 7388 * Return `true` if the given variable is accessed within a closure in the giv en |
7326 * [AstNode] and also mutated somewhere in variable scope. This information is only | 7389 * [AstNode] and also mutated somewhere in variable scope. This information is only |
7327 * available for local variables (including parameters). | 7390 * available for local variables (including parameters). |
7328 * | 7391 * |
7329 * @param variable the variable to check | 7392 * @param variable the variable to check |
7330 * @param target the [AstNode] to check within | 7393 * @param target the [AstNode] to check within |
7331 * @return `true` if this variable is potentially mutated somewhere in the giv en ASTNode | 7394 * @return `true` if this variable is potentially mutated somewhere in the giv en ASTNode |
7332 */ | 7395 */ |
7333 bool _isVariableAccessedInClosure(Element variable, AstNode target) { | 7396 bool _isVariableAccessedInClosure(Element variable, AstNode target) { |
7334 _ResolverVisitor_isVariableAccessedInClosure visitor = | 7397 _ResolverVisitor_isVariableAccessedInClosure visitor = |
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11005 return null; | 11068 return null; |
11006 } | 11069 } |
11007 if (identical(node.staticElement, variable)) { | 11070 if (identical(node.staticElement, variable)) { |
11008 if (node.inSetterContext()) { | 11071 if (node.inSetterContext()) { |
11009 result = true; | 11072 result = true; |
11010 } | 11073 } |
11011 } | 11074 } |
11012 return null; | 11075 return null; |
11013 } | 11076 } |
11014 } | 11077 } |
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