56a486c322
- this avoids using relative include paths which are forbidden by the style guide - makes the code more readable since it's clear which header is meant - allows for starting to use checkdeps BUG=none R=jkummerow@chromium.org, danno@chromium.org LOG=n Review URL: https://codereview.chromium.org/304153016 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21625 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_HYDROGEN_ESCAPE_ANALYSIS_H_
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#define V8_HYDROGEN_ESCAPE_ANALYSIS_H_
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#include "src/allocation.h"
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#include "src/hydrogen.h"
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namespace v8 {
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namespace internal {
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class HEscapeAnalysisPhase : public HPhase {
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public:
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explicit HEscapeAnalysisPhase(HGraph* graph)
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: HPhase("H_Escape analysis", graph),
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captured_(0, zone()),
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number_of_objects_(0),
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number_of_values_(0),
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cumulative_values_(0),
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block_states_(graph->blocks()->length(), zone()) { }
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void Run();
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private:
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void CollectCapturedValues();
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bool HasNoEscapingUses(HValue* value, int size);
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void PerformScalarReplacement();
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void AnalyzeDataFlow(HInstruction* instr);
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HCapturedObject* NewState(HInstruction* prev);
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HCapturedObject* NewStateForAllocation(HInstruction* prev);
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HCapturedObject* NewStateForLoopHeader(HInstruction* prev, HCapturedObject*);
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HCapturedObject* NewStateCopy(HInstruction* prev, HCapturedObject* state);
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HPhi* NewPhiAndInsert(HBasicBlock* block, HValue* incoming_value, int index);
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HValue* NewMapCheckAndInsert(HCapturedObject* state, HCheckMaps* mapcheck);
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HValue* NewLoadReplacement(HLoadNamedField* load, HValue* load_value);
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HCapturedObject* StateAt(HBasicBlock* block) {
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return block_states_.at(block->block_id());
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}
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void SetStateAt(HBasicBlock* block, HCapturedObject* state) {
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block_states_.Set(block->block_id(), state);
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}
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// List of allocations captured during collection phase.
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ZoneList<HInstruction*> captured_;
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// Number of captured objects on which scalar replacement was done.
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int number_of_objects_;
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// Number of scalar values tracked during scalar replacement phase.
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int number_of_values_;
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int cumulative_values_;
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// Map of block IDs to the data-flow state at block entry during the
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// scalar replacement phase.
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ZoneList<HCapturedObject*> block_states_;
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};
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} } // namespace v8::internal
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#endif // V8_HYDROGEN_ESCAPE_ANALYSIS_H_
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