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| 1 // Copyright 2013 the V8 project authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef V8_HYDROGEN_ESCAPE_ANALYSIS_H_ | |
| 6 #define V8_HYDROGEN_ESCAPE_ANALYSIS_H_ | |
| 7 | |
| 8 #include "src/allocation.h" | |
| 9 #include "src/hydrogen.h" | |
| 10 | |
| 11 namespace v8 { | |
| 12 namespace internal { | |
| 13 | |
| 14 | |
| 15 class HEscapeAnalysisPhase : public HPhase { | |
| 16 public: | |
| 17 explicit HEscapeAnalysisPhase(HGraph* graph) | |
| 18 : HPhase("H_Escape analysis", graph), | |
| 19 captured_(0, zone()), | |
| 20 number_of_objects_(0), | |
| 21 number_of_values_(0), | |
| 22 cumulative_values_(0), | |
| 23 block_states_(graph->blocks()->length(), zone()) { } | |
| 24 | |
| 25 void Run(); | |
| 26 | |
| 27 private: | |
| 28 void CollectCapturedValues(); | |
| 29 bool HasNoEscapingUses(HValue* value, int size); | |
| 30 void PerformScalarReplacement(); | |
| 31 void AnalyzeDataFlow(HInstruction* instr); | |
| 32 | |
| 33 HCapturedObject* NewState(HInstruction* prev); | |
| 34 HCapturedObject* NewStateForAllocation(HInstruction* prev); | |
| 35 HCapturedObject* NewStateForLoopHeader(HInstruction* prev, HCapturedObject*); | |
| 36 HCapturedObject* NewStateCopy(HInstruction* prev, HCapturedObject* state); | |
| 37 | |
| 38 HPhi* NewPhiAndInsert(HBasicBlock* block, HValue* incoming_value, int index); | |
| 39 | |
| 40 HValue* NewMapCheckAndInsert(HCapturedObject* state, HCheckMaps* mapcheck); | |
| 41 | |
| 42 HValue* NewLoadReplacement(HLoadNamedField* load, HValue* load_value); | |
| 43 | |
| 44 HCapturedObject* StateAt(HBasicBlock* block) { | |
| 45 return block_states_.at(block->block_id()); | |
| 46 } | |
| 47 | |
| 48 void SetStateAt(HBasicBlock* block, HCapturedObject* state) { | |
| 49 block_states_.Set(block->block_id(), state); | |
| 50 } | |
| 51 | |
| 52 // List of allocations captured during collection phase. | |
| 53 ZoneList<HInstruction*> captured_; | |
| 54 | |
| 55 // Number of captured objects on which scalar replacement was done. | |
| 56 int number_of_objects_; | |
| 57 | |
| 58 // Number of scalar values tracked during scalar replacement phase. | |
| 59 int number_of_values_; | |
| 60 int cumulative_values_; | |
| 61 | |
| 62 // Map of block IDs to the data-flow state at block entry during the | |
| 63 // scalar replacement phase. | |
| 64 ZoneList<HCapturedObject*> block_states_; | |
| 65 }; | |
| 66 | |
| 67 | |
| 68 } // namespace internal | |
| 69 } // namespace v8 | |
| 70 | |
| 71 #endif // V8_HYDROGEN_ESCAPE_ANALYSIS_H_ | |
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