v8/src/hydrogen-escape-analysis.h
mstarzinger@chromium.org ba48f3bd8c Consider out-of-bounds accesses as escaping uses.
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
2013-09-09 09:53:58 +00:00

92 lines
3.4 KiB
C++

// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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);
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_