ba48f3bd8c
R=titzer@chromium.org TEST=mjsunit/compiler/escape-analysis Review URL: https://codereview.chromium.org/23892007 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16589 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 "allocation.h"
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#include "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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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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