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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, 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 dev_compiler.src.codegen.side_effect_analysis; | 5 library dev_compiler.src.codegen.side_effect_analysis; |
6 | 6 |
7 import 'package:analyzer/src/generated/ast.dart'; | 7 import 'package:analyzer/src/generated/ast.dart'; |
8 import 'package:analyzer/src/generated/constant.dart'; | 8 import 'package:analyzer/src/generated/constant.dart'; |
9 import 'package:analyzer/src/generated/element.dart'; | 9 import 'package:analyzer/src/generated/element.dart'; |
10 import 'package:analyzer/src/generated/error.dart' show ErrorReporter; | 10 import 'package:analyzer/src/generated/error.dart' show ErrorReporter; |
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29 /// | 29 /// |
30 /// This method is conservative: it should never return `true` unless it is | 30 /// This method is conservative: it should never return `true` unless it is |
31 /// certain the [node] is stateless, because generated code may rely on the | 31 /// certain the [node] is stateless, because generated code may rely on the |
32 /// correctness of a `true` value. However it may return `false` for things | 32 /// correctness of a `true` value. However it may return `false` for things |
33 /// that are in fact, stateless. | 33 /// that are in fact, stateless. |
34 bool isStateless(Expression node, [AstNode context]) { | 34 bool isStateless(Expression node, [AstNode context]) { |
35 // `this` and `super` cannot be reassigned. | 35 // `this` and `super` cannot be reassigned. |
36 if (node is ThisExpression || node is SuperExpression) return true; | 36 if (node is ThisExpression || node is SuperExpression) return true; |
37 if (node is SimpleIdentifier) { | 37 if (node is SimpleIdentifier) { |
38 var e = node.staticElement; | 38 var e = node.staticElement; |
39 if (e is PropertyAccessorElement) e = e.variable; | 39 if (e is PropertyAccessorElement) e = |
| 40 (e as PropertyAccessorElement).variable; |
40 if (e is VariableElement && !e.isSynthetic) { | 41 if (e is VariableElement && !e.isSynthetic) { |
41 if (e.isFinal) return true; | 42 if (e.isFinal) return true; |
42 if (e is LocalVariableElement || e is ParameterElement) { | 43 if (e is LocalVariableElement || e is ParameterElement) { |
43 // make sure the local isn't mutated in the context. | 44 // make sure the local isn't mutated in the context. |
44 return !_isPotentiallyMutated(e, context); | 45 return !_isPotentiallyMutated(e, context); |
45 } | 46 } |
46 } | 47 } |
47 } | 48 } |
48 return false; | 49 return false; |
49 } | 50 } |
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114 // ConstantEvaluator will not compute constants for non-const fields, | 115 // ConstantEvaluator will not compute constants for non-const fields, |
115 // so run ConstantVisitor for those to figure out if the initializer is | 116 // so run ConstantVisitor for those to figure out if the initializer is |
116 // actually a constant (and therefore side effect free to evaluate). | 117 // actually a constant (and therefore side effect free to evaluate). |
117 assert(!field.isConst); | 118 assert(!field.isConst); |
118 | 119 |
119 var initializer = field.initializer; | 120 var initializer = field.initializer; |
120 if (initializer == null) return null; | 121 if (initializer == null) return null; |
121 return initializer.accept(_constantVisitor); | 122 return initializer.accept(_constantVisitor); |
122 } | 123 } |
123 } | 124 } |
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