1// Copyright 2013 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_HYDROGEN_ESCAPE_ANALYSIS_H_ 29#define V8_HYDROGEN_ESCAPE_ANALYSIS_H_ 30 31#include "allocation.h" 32#include "hydrogen.h" 33 34namespace v8 { 35namespace internal { 36 37 38class HEscapeAnalysisPhase : public HPhase { 39 public: 40 explicit HEscapeAnalysisPhase(HGraph* graph) 41 : HPhase("H_Escape analysis", graph), 42 captured_(0, zone()), 43 number_of_values_(0), 44 cumulative_values_(0), 45 block_states_(graph->blocks()->length(), zone()) { } 46 47 void Run() { 48 CollectCapturedValues(); 49 PerformScalarReplacement(); 50 } 51 52 private: 53 void CollectCapturedValues(); 54 void CollectIfNoEscapingUses(HInstruction* instr); 55 void PerformScalarReplacement(); 56 void AnalyzeDataFlow(HInstruction* instr); 57 58 HCapturedObject* NewState(HInstruction* prev); 59 HCapturedObject* NewStateForAllocation(HInstruction* prev); 60 HCapturedObject* NewStateForLoopHeader(HInstruction* prev, HCapturedObject*); 61 HCapturedObject* NewStateCopy(HInstruction* prev, HCapturedObject* state); 62 63 HPhi* NewPhiAndInsert(HBasicBlock* block, HValue* incoming_value, int index); 64 65 HCapturedObject* StateAt(HBasicBlock* block) { 66 return block_states_.at(block->block_id()); 67 } 68 69 void SetStateAt(HBasicBlock* block, HCapturedObject* state) { 70 block_states_.Set(block->block_id(), state); 71 } 72 73 // List of allocations captured during collection phase. 74 ZoneList<HInstruction*> captured_; 75 76 // Number of scalar values tracked during scalar replacement phase. 77 int number_of_values_; 78 int cumulative_values_; 79 80 // Map of block IDs to the data-flow state at block entry during the 81 // scalar replacement phase. 82 ZoneList<HCapturedObject*> block_states_; 83}; 84 85 86} } // namespace v8::internal 87 88#endif // V8_HYDROGEN_ESCAPE_ANALYSIS_H_ 89