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 34 namespace v8 { 35 namespace internal { 36 37 38 class HEscapeAnalysisPhase : public HPhase { 39 public: HEscapeAnalysisPhase(HGraph * graph)40 explicit HEscapeAnalysisPhase(HGraph* graph) 41 : HPhase("H_Escape analysis", graph), 42 captured_(0, zone()), 43 number_of_objects_(0), 44 number_of_values_(0), 45 cumulative_values_(0), 46 block_states_(graph->blocks()->length(), zone()) { } 47 48 void Run(); 49 50 private: 51 void CollectCapturedValues(); 52 bool HasNoEscapingUses(HValue* value, int size); 53 void PerformScalarReplacement(); 54 void AnalyzeDataFlow(HInstruction* instr); 55 56 HCapturedObject* NewState(HInstruction* prev); 57 HCapturedObject* NewStateForAllocation(HInstruction* prev); 58 HCapturedObject* NewStateForLoopHeader(HInstruction* prev, HCapturedObject*); 59 HCapturedObject* NewStateCopy(HInstruction* prev, HCapturedObject* state); 60 61 HPhi* NewPhiAndInsert(HBasicBlock* block, HValue* incoming_value, int index); 62 63 HValue* NewMapCheckAndInsert(HCapturedObject* state, HCheckMaps* mapcheck); 64 StateAt(HBasicBlock * block)65 HCapturedObject* StateAt(HBasicBlock* block) { 66 return block_states_.at(block->block_id()); 67 } 68 SetStateAt(HBasicBlock * block,HCapturedObject * state)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 captured objects on which scalar replacement was done. 77 int number_of_objects_; 78 79 // Number of scalar values tracked during scalar replacement phase. 80 int number_of_values_; 81 int cumulative_values_; 82 83 // Map of block IDs to the data-flow state at block entry during the 84 // scalar replacement phase. 85 ZoneList<HCapturedObject*> block_states_; 86 }; 87 88 89 } } // namespace v8::internal 90 91 #endif // V8_HYDROGEN_ESCAPE_ANALYSIS_H_ 92