v8/src/hydrogen-escape-analysis.h

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// 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 "src/allocation.h"
#include "src/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_