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 13namespace v8 { 14namespace internal { 15namespace interpreter { 16 17class BytecodePeepholeActionAndData; 18 19// An optimization stage for performing peephole optimizations on 20// generated bytecode. The optimizer may buffer one bytecode 21// internally. 22class 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