| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_HYDROGEN_ESCAPE_ANALYSIS_H_ |
| #define V8_HYDROGEN_ESCAPE_ANALYSIS_H_ |
| |
| #include "allocation.h" |
| #include "hydrogen.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| class HEscapeAnalysisPhase : public HPhase { |
| public: |
| explicit HEscapeAnalysisPhase(HGraph* graph) |
| : HPhase("H_Escape analysis", graph), |
| captured_(0, zone()), |
| number_of_objects_(0), |
| number_of_values_(0), |
| cumulative_values_(0), |
| block_states_(graph->blocks()->length(), zone()) { } |
| |
| void Run(); |
| |
| private: |
| void CollectCapturedValues(); |
| bool HasNoEscapingUses(HValue* value, int size); |
| void PerformScalarReplacement(); |
| void AnalyzeDataFlow(HInstruction* instr); |
| |
| HCapturedObject* NewState(HInstruction* prev); |
| HCapturedObject* NewStateForAllocation(HInstruction* prev); |
| HCapturedObject* NewStateForLoopHeader(HInstruction* prev, HCapturedObject*); |
| HCapturedObject* NewStateCopy(HInstruction* prev, HCapturedObject* state); |
| |
| HPhi* NewPhiAndInsert(HBasicBlock* block, HValue* incoming_value, int index); |
| |
| HValue* NewMapCheckAndInsert(HCapturedObject* state, HCheckMaps* mapcheck); |
| |
| HValue* NewLoadReplacement(HLoadNamedField* load, HValue* load_value); |
| |
| HCapturedObject* StateAt(HBasicBlock* block) { |
| return block_states_.at(block->block_id()); |
| } |
| |
| void SetStateAt(HBasicBlock* block, HCapturedObject* state) { |
| block_states_.Set(block->block_id(), state); |
| } |
| |
| // List of allocations captured during collection phase. |
| ZoneList<HInstruction*> captured_; |
| |
| // Number of captured objects on which scalar replacement was done. |
| int number_of_objects_; |
| |
| // Number of scalar values tracked during scalar replacement phase. |
| int number_of_values_; |
| int cumulative_values_; |
| |
| // Map of block IDs to the data-flow state at block entry during the |
| // scalar replacement phase. |
| ZoneList<HCapturedObject*> block_states_; |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_HYDROGEN_ESCAPE_ANALYSIS_H_ |