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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'; |
| (...skipping 24 matching lines...) Expand all Loading... |
| 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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