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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef V8_INTERPRETER_BYTECODE_REGISTER_OPTIMIZER_H_ |
| 6 #define V8_INTERPRETER_BYTECODE_REGISTER_OPTIMIZER_H_ |
| 7 |
| 8 #include "src/interpreter/bytecode-pipeline.h" |
| 9 |
| 10 namespace v8 { |
| 11 namespace internal { |
| 12 namespace interpreter { |
| 13 |
| 14 class BytecodeRegisterOptimizer final : public BytecodePipelineStage, |
| 15 public TemporaryRegisterObserver, |
| 16 public ZoneObject { |
| 17 public: |
| 18 BytecodeRegisterOptimizer(Zone* zone, |
| 19 TemporaryRegisterAllocator* register_allocator, |
| 20 int parameter_count, int fixed_register_count, |
| 21 BytecodePipelineStage* next_stage); |
| 22 virtual ~BytecodeRegisterOptimizer() {} |
| 23 |
| 24 size_t FlushForOffset() override; |
| 25 void FlushBasicBlock() override; |
| 26 void Write(BytecodeNode* node) override; |
| 27 |
| 28 private: |
| 29 class RegisterInfo; |
| 30 |
| 31 void Dump(); |
| 32 |
| 33 static Register OperandToRegister(uint32_t operand); |
| 34 static Register GetRegisterInputOperand(int index, Bytecode bytecode, |
| 35 const uint32_t* operands, |
| 36 int operand_count); |
| 37 static Register GetRegisterOutputOperand(int index, Bytecode bytecode, |
| 38 const uint32_t* operands, |
| 39 int operand_count); |
| 40 |
| 41 bool RegisterIsTemporary(Register reg) const { |
| 42 return reg >= temporary_base_; |
| 43 } |
| 44 |
| 45 bool RegisterIsObservable(Register reg) const { |
| 46 return reg != accumulator_ && !RegisterIsTemporary(reg); |
| 47 } |
| 48 |
| 49 // TemporaryRegisterObserver interface. |
| 50 void TemporaryRegisterFreeEvent(Register reg) override; |
| 51 |
| 52 void FlushState(); |
| 53 void WriteToNextStage(BytecodeNode* node); |
| 54 void WriteToNextStage(BytecodeNode* node, RegisterInfo* output_info); |
| 55 |
| 56 void PrepareForClobber(RegisterInfo* reg_info); |
| 57 void PrepareForClobberRange(Register start, int count); |
| 58 Register PrepareRegisterInputOperand(Register reg); |
| 59 void PrepareRegisterRangeInputOperand(Register start, int count); |
| 60 void PrepareOperands(BytecodeNode* node); |
| 61 |
| 62 void OutputRegisterTransfer(RegisterInfo* input, RegisterInfo* output); |
| 63 void CreateMaterializedEquivalentIfRequired(RegisterInfo* info); |
| 64 RegisterInfo* GetMaterializedEquivalent(RegisterInfo* info); |
| 65 RegisterInfo* GetMaterializedEquivalentNotAccumulator(RegisterInfo* info); |
| 66 void Materialize(RegisterInfo* info); |
| 67 |
| 68 void RegisterTransfer(RegisterInfo* input, RegisterInfo* output); |
| 69 void DoLdar(const BytecodeNode* const node); |
| 70 void DoMov(const BytecodeNode* const node); |
| 71 void DoStar(const BytecodeNode* const node); |
| 72 |
| 73 void EmitNop(BytecodeNode* node); |
| 74 |
| 75 RegisterInfo* GetOrCreateRegisterInfo(Register reg); |
| 76 RegisterInfo* GetRegisterInfo(Register reg); |
| 77 RegisterInfo* NewRegisterInfo(Register reg); |
| 78 void GrowRegisterMap(Register reg); |
| 79 |
| 80 size_t GetMapIndex(Register reg) const { |
| 81 return static_cast<size_t>(reg.index() + map_index_offset_); |
| 82 } |
| 83 Register RegisterFromMapIndex(size_t index) const { |
| 84 return Register(static_cast<int>(index) - map_index_offset_); |
| 85 } |
| 86 |
| 87 Zone* zone() { return zone_; } |
| 88 |
| 89 const Register accumulator_; |
| 90 RegisterInfo* accumulator_info_; |
| 91 const Register temporary_base_; |
| 92 |
| 93 // Direct mapping to register info. |
| 94 ZoneVector<RegisterInfo*> register_map_; |
| 95 int map_index_offset_; |
| 96 |
| 97 // Counter for equivalence sets identifiers. |
| 98 int equivalence_id_; |
| 99 |
| 100 BytecodePipelineStage* next_stage_; |
| 101 bool flushed_; |
| 102 Zone* zone_; |
| 103 |
| 104 DISALLOW_COPY_AND_ASSIGN(BytecodeRegisterOptimizer); |
| 105 }; |
| 106 |
| 107 } // namespace interpreter |
| 108 } // namespace internal |
| 109 } // namespace v8 |
| 110 |
| 111 #endif // V8_INTERPRETER_BYTECODE_REGISTER_OPTIMIZER_H_ |
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