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_CHECK_ELIMINATION_H_ 6 #define V8_HYDROGEN_CHECK_ELIMINATION_H_ 7 8 #include "src/hydrogen.h" 9 #include "src/hydrogen-alias-analysis.h" 10 11 namespace v8 { 12 namespace internal { 13 14 15 // Remove CheckMaps instructions through flow- and branch-sensitive analysis. 16 class HCheckEliminationPhase : public HPhase { 17 public: 18 explicit HCheckEliminationPhase(HGraph* graph) 19 : HPhase("H_Check Elimination", graph), aliasing_(), 20 string_maps_(kStringMapsSize, zone()) { 21 // Compute the set of string maps. 22 #define ADD_STRING_MAP(type, size, name, Name) \ 23 string_maps_.Add(Unique<Map>::CreateImmovable( \ 24 graph->isolate()->factory()->name##_map()), zone()); 25 STRING_TYPE_LIST(ADD_STRING_MAP) 26 #undef ADD_STRING_MAP 27 ASSERT_EQ(kStringMapsSize, string_maps_.size()); 28 #ifdef DEBUG 29 redundant_ = 0; 30 removed_ = 0; 31 removed_cho_ = 0; 32 removed_cit_ = 0; 33 narrowed_ = 0; 34 loads_ = 0; 35 empty_ = 0; 36 compares_true_ = 0; 37 compares_false_ = 0; 38 transitions_ = 0; 39 #endif 40 } 41 42 void Run(); 43 44 friend class HCheckTable; 45 46 private: 47 const UniqueSet<Map>* string_maps() const { return &string_maps_; } 48 49 void PrintStats(); 50 51 HAliasAnalyzer* aliasing_; 52 #define COUNT(type, size, name, Name) + 1 53 static const int kStringMapsSize = 0 STRING_TYPE_LIST(COUNT); 54 #undef COUNT 55 UniqueSet<Map> string_maps_; 56 #ifdef DEBUG 57 int redundant_; 58 int removed_; 59 int removed_cho_; 60 int removed_cit_; 61 int narrowed_; 62 int loads_; 63 int empty_; 64 int compares_true_; 65 int compares_false_; 66 int transitions_; 67 #endif 68 }; 69 70 71 } } // namespace v8::internal 72 73 #endif // V8_HYDROGEN_CHECK_ELIMINATION_H_ 74
