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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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775 HValue* RedefinedOperand() { | 775 HValue* RedefinedOperand() { |
776 int index = RedefinedOperandIndex(); | 776 int index = RedefinedOperandIndex(); |
777 return index == kNoRedefinedOperand ? NULL : OperandAt(index); | 777 return index == kNoRedefinedOperand ? NULL : OperandAt(index); |
778 } | 778 } |
779 | 779 |
780 // A purely informative definition is an idef that will not emit code and | 780 // A purely informative definition is an idef that will not emit code and |
781 // should therefore be removed from the graph in the RestoreActualValues | 781 // should therefore be removed from the graph in the RestoreActualValues |
782 // phase (so that live ranges will be shorter). | 782 // phase (so that live ranges will be shorter). |
783 virtual bool IsPurelyInformativeDefinition() { return false; } | 783 virtual bool IsPurelyInformativeDefinition() { return false; } |
784 | 784 |
785 // This method must always return the original HValue SSA definition | 785 // This method must always return the original HValue SSA definition, |
786 // (regardless of any iDef of this value). | 786 // regardless of any chain of iDefs of this value. |
787 HValue* ActualValue() { | 787 HValue* ActualValue() { |
788 int index = RedefinedOperandIndex(); | 788 HValue* value = this; |
789 return index == kNoRedefinedOperand ? this : OperandAt(index); | 789 int index; |
| 790 while ((index = value->RedefinedOperandIndex()) != kNoRedefinedOperand) { |
| 791 value = value->OperandAt(index); |
| 792 } |
| 793 return value; |
790 } | 794 } |
791 | 795 |
792 bool IsInteger32Constant(); | 796 bool IsInteger32Constant(); |
793 int32_t GetInteger32Constant(); | 797 int32_t GetInteger32Constant(); |
794 bool EqualsInteger32Constant(int32_t value); | 798 bool EqualsInteger32Constant(int32_t value); |
795 | 799 |
796 bool IsDefinedAfter(HBasicBlock* other) const; | 800 bool IsDefinedAfter(HBasicBlock* other) const; |
797 | 801 |
798 // Operands. | 802 // Operands. |
799 virtual int OperandCount() = 0; | 803 virtual int OperandCount() = 0; |
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6969 virtual bool IsDeletable() const V8_OVERRIDE { return true; } | 6973 virtual bool IsDeletable() const V8_OVERRIDE { return true; } |
6970 }; | 6974 }; |
6971 | 6975 |
6972 | 6976 |
6973 #undef DECLARE_INSTRUCTION | 6977 #undef DECLARE_INSTRUCTION |
6974 #undef DECLARE_CONCRETE_INSTRUCTION | 6978 #undef DECLARE_CONCRETE_INSTRUCTION |
6975 | 6979 |
6976 } } // namespace v8::internal | 6980 } } // namespace v8::internal |
6977 | 6981 |
6978 #endif // V8_HYDROGEN_INSTRUCTIONS_H_ | 6982 #endif // V8_HYDROGEN_INSTRUCTIONS_H_ |
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