1 // Copyright 2016 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_PEEPHOLE_OPTIMIZER_H_ 6 #define V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ 7 8 #include "src/base/compiler-specific.h" 9 #include "src/globals.h" 10 #include "src/interpreter/bytecode-peephole-table.h" 11 #include "src/interpreter/bytecode-pipeline.h" 12 13 namespace v8 { 14 namespace internal { 15 namespace interpreter { 16 17 class BytecodePeepholeActionAndData; 18 19 // An optimization stage for performing peephole optimizations on 20 // generated bytecode. The optimizer may buffer one bytecode 21 // internally. 22 class V8_EXPORT_PRIVATE BytecodePeepholeOptimizer final 23 : public NON_EXPORTED_BASE(BytecodePipelineStage), 24 public NON_EXPORTED_BASE(ZoneObject) { 25 public: 26 explicit BytecodePeepholeOptimizer(BytecodePipelineStage* next_stage); 27 28 // BytecodePipelineStage interface. 29 void Write(BytecodeNode* node) override; 30 void WriteJump(BytecodeNode* node, BytecodeLabel* label) override; 31 void BindLabel(BytecodeLabel* label) override; 32 void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override; 33 Handle<BytecodeArray> ToBytecodeArray( 34 Isolate* isolate, int register_count, int parameter_count, 35 Handle<FixedArray> handler_table) override; 36 37 private: 38 #define DECLARE_ACTION(Action) \ 39 void Action(BytecodeNode* const node, \ 40 const PeepholeActionAndData* const action_data = nullptr); 41 PEEPHOLE_ACTION_LIST(DECLARE_ACTION) 42 #undef DECLARE_ACTION 43 44 void ApplyPeepholeAction(BytecodeNode* const node); 45 void Flush(); 46 bool CanElideLastBasedOnSourcePosition( 47 const BytecodeNode* const current) const; 48 void InvalidateLast(); 49 bool LastIsValid() const; 50 void SetLast(const BytecodeNode* const node); 51 52 BytecodePipelineStage* next_stage() const { return next_stage_; } 53 BytecodeNode* last() { return &last_; } 54 55 BytecodePipelineStage* next_stage_; 56 BytecodeNode last_; 57 58 DISALLOW_COPY_AND_ASSIGN(BytecodePeepholeOptimizer); 59 }; 60 61 } // namespace interpreter 62 } // namespace internal 63 } // namespace v8 64 65 #endif // V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ 66
