| // 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_RANGE_ANALYSIS_H_ |
| #define V8_HYDROGEN_RANGE_ANALYSIS_H_ |
| |
| #include "hydrogen.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| class HRangeAnalysisPhase : public HPhase { |
| public: |
| explicit HRangeAnalysisPhase(HGraph* graph) |
| : HPhase("H_Range analysis", graph), changed_ranges_(16, zone()), |
| in_worklist_(graph->GetMaximumValueID(), zone()), |
| worklist_(32, zone()) {} |
| |
| void Run(); |
| |
| private: |
| void TraceRange(const char* msg, ...); |
| void InferControlFlowRange(HCompareNumericAndBranch* test, |
| HBasicBlock* dest); |
| void UpdateControlFlowRange(Token::Value op, HValue* value, HValue* other); |
| void InferRange(HValue* value); |
| void RollBackTo(int index); |
| void AddRange(HValue* value, Range* range); |
| void AddToWorklist(HValue* value) { |
| if (in_worklist_.Contains(value->id())) return; |
| in_worklist_.Add(value->id()); |
| worklist_.Add(value, zone()); |
| } |
| void PropagateMinusZeroChecks(HValue* value); |
| void PoisonRanges(); |
| |
| ZoneList<HValue*> changed_ranges_; |
| |
| BitVector in_worklist_; |
| ZoneList<HValue*> worklist_; |
| |
| DISALLOW_COPY_AND_ASSIGN(HRangeAnalysisPhase); |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_HYDROGEN_RANGE_ANALYSIS_H_ |