1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_HYDROGEN_RANGE_ANALYSIS_H_ 6 #define V8_HYDROGEN_RANGE_ANALYSIS_H_ 7 8 #include "src/hydrogen.h" 9 10 namespace v8 { 11 namespace internal { 12 13 14 class HRangeAnalysisPhase : public HPhase { 15 public: 16 explicit HRangeAnalysisPhase(HGraph* graph) 17 : HPhase("H_Range analysis", graph), changed_ranges_(16, zone()), 18 in_worklist_(graph->GetMaximumValueID(), zone()), 19 worklist_(32, zone()) {} 20 21 void Run(); 22 23 private: 24 void TraceRange(const char* msg, ...); 25 void InferControlFlowRange(HCompareNumericAndBranch* test, 26 HBasicBlock* dest); 27 void UpdateControlFlowRange(Token::Value op, HValue* value, HValue* other); 28 void InferRange(HValue* value); 29 void RollBackTo(int index); 30 void AddRange(HValue* value, Range* range); 31 void AddToWorklist(HValue* value) { 32 if (in_worklist_.Contains(value->id())) return; 33 in_worklist_.Add(value->id()); 34 worklist_.Add(value, zone()); 35 } 36 void PropagateMinusZeroChecks(HValue* value); 37 void PoisonRanges(); 38 39 ZoneList<HValue*> changed_ranges_; 40 41 BitVector in_worklist_; 42 ZoneList<HValue*> worklist_; 43 44 DISALLOW_COPY_AND_ASSIGN(HRangeAnalysisPhase); 45 }; 46 47 48 } } // namespace v8::internal 49 50 #endif // V8_HYDROGEN_RANGE_ANALYSIS_H_ 51
