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1 // Copyright 2013 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_HYDROGEN_GVN_H_ | 5 #ifndef V8_HYDROGEN_GVN_H_ |
6 #define V8_HYDROGEN_GVN_H_ | 6 #define V8_HYDROGEN_GVN_H_ |
7 | 7 |
8 #include <iosfwd> | 8 #include <iosfwd> |
9 | 9 |
10 #include "src/hydrogen.h" | 10 #include "src/hydrogen.h" |
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63 // field stores don't prevent hoisting and merging of global variable/inobject | 63 // field stores don't prevent hoisting and merging of global variable/inobject |
64 // field loads. | 64 // field loads. |
65 class SideEffectsTracker FINAL BASE_EMBEDDED { | 65 class SideEffectsTracker FINAL BASE_EMBEDDED { |
66 public: | 66 public: |
67 SideEffectsTracker() : num_global_vars_(0), num_inobject_fields_(0) {} | 67 SideEffectsTracker() : num_global_vars_(0), num_inobject_fields_(0) {} |
68 SideEffects ComputeChanges(HInstruction* instr); | 68 SideEffects ComputeChanges(HInstruction* instr); |
69 SideEffects ComputeDependsOn(HInstruction* instr); | 69 SideEffects ComputeDependsOn(HInstruction* instr); |
70 | 70 |
71 private: | 71 private: |
72 friend std::ostream& operator<<(std::ostream& os, const TrackedEffects& f); | 72 friend std::ostream& operator<<(std::ostream& os, const TrackedEffects& f); |
73 bool ComputeGlobalVar(Unique<Cell> cell, int* index); | 73 bool ComputeGlobalVar(Unique<PropertyCell> cell, int* index); |
74 bool ComputeInobjectField(HObjectAccess access, int* index); | 74 bool ComputeInobjectField(HObjectAccess access, int* index); |
75 | 75 |
76 static int GlobalVar(int index) { | 76 static int GlobalVar(int index) { |
77 DCHECK(index >= 0); | 77 DCHECK(index >= 0); |
78 DCHECK(index < kNumberOfGlobalVars); | 78 DCHECK(index < kNumberOfGlobalVars); |
79 return index; | 79 return index; |
80 } | 80 } |
81 static int InobjectField(int index) { | 81 static int InobjectField(int index) { |
82 DCHECK(index >= 0); | 82 DCHECK(index >= 0); |
83 DCHECK(index < kNumberOfInobjectFields); | 83 DCHECK(index < kNumberOfInobjectFields); |
84 return index + kNumberOfGlobalVars; | 84 return index + kNumberOfGlobalVars; |
85 } | 85 } |
86 | 86 |
87 // Track up to four global vars. | 87 // Track up to four global vars. |
88 static const int kNumberOfGlobalVars = 4; | 88 static const int kNumberOfGlobalVars = 4; |
89 Unique<Cell> global_vars_[kNumberOfGlobalVars]; | 89 Unique<PropertyCell> global_vars_[kNumberOfGlobalVars]; |
90 int num_global_vars_; | 90 int num_global_vars_; |
91 | 91 |
92 // Track up to n inobject fields. | 92 // Track up to n inobject fields. |
93 static const int kNumberOfInobjectFields = | 93 static const int kNumberOfInobjectFields = |
94 SideEffects::kNumberOfSpecials - kNumberOfGlobalVars; | 94 SideEffects::kNumberOfSpecials - kNumberOfGlobalVars; |
95 HObjectAccess inobject_fields_[kNumberOfInobjectFields]; | 95 HObjectAccess inobject_fields_[kNumberOfInobjectFields]; |
96 int num_inobject_fields_; | 96 int num_inobject_fields_; |
97 }; | 97 }; |
98 | 98 |
99 | 99 |
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144 // Used when collecting side effects on paths from dominator to | 144 // Used when collecting side effects on paths from dominator to |
145 // dominated. | 145 // dominated. |
146 BitVector visited_on_paths_; | 146 BitVector visited_on_paths_; |
147 | 147 |
148 DISALLOW_COPY_AND_ASSIGN(HGlobalValueNumberingPhase); | 148 DISALLOW_COPY_AND_ASSIGN(HGlobalValueNumberingPhase); |
149 }; | 149 }; |
150 | 150 |
151 } } // namespace v8::internal | 151 } } // namespace v8::internal |
152 | 152 |
153 #endif // V8_HYDROGEN_GVN_H_ | 153 #endif // V8_HYDROGEN_GVN_H_ |
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