OLD | NEW |
1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 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_INTERPRETER_REGISTER_TRANSLATOR_H_ | 5 #ifndef V8_INTERPRETER_REGISTER_TRANSLATOR_H_ |
6 #define V8_INTERPRETER_REGISTER_TRANSLATOR_H_ | 6 #define V8_INTERPRETER_REGISTER_TRANSLATOR_H_ |
7 | 7 |
8 #include "src/interpreter/bytecodes.h" | 8 #include "src/interpreter/bytecodes.h" |
9 | 9 |
10 namespace v8 { | 10 namespace v8 { |
(...skipping 59 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
70 // value indicates the translation window is required. | 70 // value indicates the translation window is required. |
71 static int RegisterCountAdjustment(int register_count, int parameter_count); | 71 static int RegisterCountAdjustment(int register_count, int parameter_count); |
72 | 72 |
73 private: | 73 private: |
74 static const int kTranslationWindowLength = 4; | 74 static const int kTranslationWindowLength = 4; |
75 static const int kTranslationWindowLimit = -kMinInt8; | 75 static const int kTranslationWindowLimit = -kMinInt8; |
76 static const int kTranslationWindowStart = | 76 static const int kTranslationWindowStart = |
77 kTranslationWindowLimit - kTranslationWindowLength + 1; | 77 kTranslationWindowLimit - kTranslationWindowLength + 1; |
78 | 78 |
79 Register TranslateAndMove(Bytecode bytecode, int operand_index, Register reg); | 79 Register TranslateAndMove(Bytecode bytecode, int operand_index, Register reg); |
80 Register MakeAddressable(Register reg, OperandType reg_type); | 80 static bool RegisterIsMovableToWindow(Bytecode bytecode, int operand_index); |
| 81 |
81 static Register Translate(Register reg); | 82 static Register Translate(Register reg); |
82 | 83 |
83 RegisterMover* mover() const { return mover_; } | 84 RegisterMover* mover() const { return mover_; } |
84 | 85 |
85 // Entity to perform register moves necessary to translate registers | 86 // Entity to perform register moves necessary to translate registers |
86 // and ensure reachability. | 87 // and ensure reachability. |
87 RegisterMover* mover_; | 88 RegisterMover* mover_; |
88 | 89 |
89 // Flag to avoid re-entrancy when emitting move bytecodes for | 90 // Flag to avoid re-entrancy when emitting move bytecodes for |
90 // translation. | 91 // translation. |
91 bool emitting_moves_; | 92 bool emitting_moves_; |
92 | 93 |
93 // State for restoring registers after bytecode. | 94 // Number of window registers in use. |
94 Register window_registers_[kTranslationWindowLength]; | |
95 int window_registers_count_; | 95 int window_registers_count_; |
| 96 |
| 97 // State for restoring register moves emitted by TranslateOutputRegisters. |
| 98 std::pair<Register, Register> output_moves_[kTranslationWindowLength]; |
| 99 int output_moves_count_; |
96 }; | 100 }; |
97 | 101 |
98 // Interface for RegisterTranslator helper class that will emit | 102 // Interface for RegisterTranslator helper class that will emit |
99 // register move bytecodes at the translator's behest. | 103 // register move bytecodes at the translator's behest. |
100 class RegisterMover { | 104 class RegisterMover { |
101 public: | 105 public: |
102 virtual ~RegisterMover() {} | 106 virtual ~RegisterMover() {} |
103 | 107 |
104 // Move register |from| to register |to| with no translation. | 108 // Move register |from| to register |to| with no translation. |
105 // returns false if either register operand is invalid. Implementations | 109 // returns false if either register operand is invalid. Implementations |
106 // of this method must be aware that register moves with bad | 110 // of this method must be aware that register moves with bad |
107 // register values are a security hole. | 111 // register values are a security hole. |
108 virtual void MoveRegisterUntranslated(Register from, Register to) = 0; | 112 virtual void MoveRegisterUntranslated(Register from, Register to) = 0; |
109 | |
110 // Returns true if the register operand can be moved into the | |
111 // translation window. | |
112 virtual bool RegisterOperandIsMovable(Bytecode bytecode, | |
113 int operand_index) = 0; | |
114 }; | 113 }; |
115 | 114 |
116 } // namespace interpreter | 115 } // namespace interpreter |
117 } // namespace internal | 116 } // namespace internal |
118 } // namespace v8 | 117 } // namespace v8 |
119 | 118 |
120 #endif // V8_INTERPRETER_REGISTER_TRANSLATOR_H_ | 119 #endif // V8_INTERPRETER_REGISTER_TRANSLATOR_H_ |
OLD | NEW |