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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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 part of ssa; | 5 part of ssa; |
6 | 6 |
7 abstract class OptimizationPhase { | 7 abstract class OptimizationPhase { |
8 String get name; | 8 String get name; |
9 void visitGraph(HGraph graph); | 9 void visitGraph(HGraph graph); |
10 } | 10 } |
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745 SsaDeadCodeEliminator(this.types); | 745 SsaDeadCodeEliminator(this.types); |
746 | 746 |
747 bool isDeadCode(HInstruction instruction) { | 747 bool isDeadCode(HInstruction instruction) { |
748 return !instruction.hasSideEffects(types) | 748 return !instruction.hasSideEffects(types) |
749 && instruction.usedBy.isEmpty | 749 && instruction.usedBy.isEmpty |
750 // A dynamic getter that has no side effect can still throw | 750 // A dynamic getter that has no side effect can still throw |
751 // a NoSuchMethodError or a NullPointerException. | 751 // a NoSuchMethodError or a NullPointerException. |
752 && instruction is !HInvokeDynamicGetter | 752 && instruction is !HInvokeDynamicGetter |
753 && instruction is !HCheck | 753 && instruction is !HCheck |
754 && instruction is !HTypeGuard | 754 && instruction is !HTypeGuard |
| 755 && instruction is !HParameterValue |
755 && !instruction.isControlFlow(); | 756 && !instruction.isControlFlow(); |
756 } | 757 } |
757 | 758 |
758 void visitGraph(HGraph graph) { | 759 void visitGraph(HGraph graph) { |
759 visitPostDominatorTree(graph); | 760 visitPostDominatorTree(graph); |
760 } | 761 } |
761 | 762 |
762 void visitBasicBlock(HBasicBlock block) { | 763 void visitBasicBlock(HBasicBlock block) { |
763 HInstruction instruction = block.last; | 764 HInstruction instruction = block.last; |
764 while (instruction != null) { | 765 while (instruction != null) { |
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1350 } | 1351 } |
1351 | 1352 |
1352 // For other fields having setters in the generative constructor body, set | 1353 // For other fields having setters in the generative constructor body, set |
1353 // the type to UNKNOWN to avoid relying on the type set in the initializer | 1354 // the type to UNKNOWN to avoid relying on the type set in the initializer |
1354 // list. | 1355 // list. |
1355 allSetters.forEach((Element element) { | 1356 allSetters.forEach((Element element) { |
1356 backend.registerFieldConstructor(element, HType.UNKNOWN); | 1357 backend.registerFieldConstructor(element, HType.UNKNOWN); |
1357 }); | 1358 }); |
1358 } | 1359 } |
1359 } | 1360 } |
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