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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 dart2js.cps_ir.optimizers; | 5 library dart2js.cps_ir.optimizers; |
6 | 6 |
7 import 'cps_ir_nodes.dart'; | 7 import 'cps_ir_nodes.dart'; |
8 import '../constants/values.dart'; | 8 import '../constants/values.dart'; |
9 import '../common/names.dart'; | 9 import '../common/names.dart'; |
10 import '../universe/selector.dart'; | 10 import '../universe/selector.dart'; |
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35 void rewrite(FunctionDefinition root); | 35 void rewrite(FunctionDefinition root); |
36 | 36 |
37 String get passName; | 37 String get passName; |
38 } | 38 } |
39 | 39 |
40 // Shared code between optimizations | 40 // Shared code between optimizations |
41 | 41 |
42 /// Returns true if [value] is false, null, 0, -0, NaN, or the empty string. | 42 /// Returns true if [value] is false, null, 0, -0, NaN, or the empty string. |
43 bool isFalsyConstant(ConstantValue value) { | 43 bool isFalsyConstant(ConstantValue value) { |
44 return value.isFalse || | 44 return value.isFalse || |
45 value.isNull || | 45 value.isNull || |
46 value.isZero || | 46 value.isZero || |
47 value.isMinusZero || | 47 value.isMinusZero || |
48 value.isNaN || | 48 value.isNaN || |
49 value is StringConstantValue && value.primitiveValue.isEmpty; | 49 value is StringConstantValue && value.primitiveValue.isEmpty; |
50 } | 50 } |
51 | 51 |
52 /// Returns true if [value] satisfies a branching condition with the | 52 /// Returns true if [value] satisfies a branching condition with the |
53 /// given strictness. | 53 /// given strictness. |
54 /// | 54 /// |
55 /// For non-strict, this is the opposite of [isFalsyConstant]. | 55 /// For non-strict, this is the opposite of [isFalsyConstant]. |
56 bool isTruthyConstant(ConstantValue value, {bool strict: false}) { | 56 bool isTruthyConstant(ConstantValue value, {bool strict: false}) { |
57 return strict ? value.isTrue : !isFalsyConstant(value); | 57 return strict ? value.isTrue : !isFalsyConstant(value); |
58 } | 58 } |
59 | 59 |
60 /// Selectors that do not throw when invoked on the null value. | 60 /// Selectors that do not throw when invoked on the null value. |
61 final List<Selector> selectorsOnNull = <Selector>[ | 61 final List<Selector> selectorsOnNull = <Selector>[ |
62 Selectors.equals, Selectors.hashCode_, Selectors.runtimeType_, | 62 Selectors.equals, |
63 Selectors.toString_, Selectors.toStringGetter, | 63 Selectors.hashCode_, |
64 Selectors.noSuchMethodGetter]; | 64 Selectors.runtimeType_, |
| 65 Selectors.toString_, |
| 66 Selectors.toStringGetter, |
| 67 Selectors.noSuchMethodGetter |
| 68 ]; |
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