| // 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_values_(0), |
| cumulative_values_(0), |
| block_states_(graph->blocks()->length(), zone()) { } |
| |
| void Run() { |
| CollectCapturedValues(); |
| PerformScalarReplacement(); |
| } |
| |
| private: |
| void CollectCapturedValues(); |
| void CollectIfNoEscapingUses(HInstruction* instr); |
| 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); |
| |
| 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 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_ |