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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_
#define V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_
#include "src/interpreter/bytecode-peephole-table.h"
#include "src/interpreter/bytecode-pipeline.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodePeepholeActionAndData;
// An optimization stage for performing peephole optimizations on
// generated bytecode. The optimizer may buffer one bytecode
// internally.
class BytecodePeepholeOptimizer final : public BytecodePipelineStage,
public ZoneObject {
public:
explicit BytecodePeepholeOptimizer(BytecodePipelineStage* next_stage);
// BytecodePipelineStage interface.
void Write(BytecodeNode* node) override;
void WriteJump(BytecodeNode* node, BytecodeLabel* label) override;
void BindLabel(BytecodeLabel* label) override;
void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override;
Handle<BytecodeArray> ToBytecodeArray(
Isolate* isolate, int register_count, int parameter_count,
Handle<FixedArray> handler_table) override;
private:
#define DECLARE_ACTION(Action) \
void Action(BytecodeNode* const node, \
const PeepholeActionAndData* const action_data = nullptr);
PEEPHOLE_ACTION_LIST(DECLARE_ACTION)
#undef DECLARE_ACTION
void ApplyPeepholeAction(BytecodeNode* const node);
void Flush();
bool CanElideLastBasedOnSourcePosition(
const BytecodeNode* const current) const;
void InvalidateLast();
bool LastIsValid() const;
void SetLast(const BytecodeNode* const node);
BytecodePipelineStage* next_stage() const { return next_stage_; }
BytecodeNode* last() { return &last_; }
BytecodePipelineStage* next_stage_;
BytecodeNode last_;
DISALLOW_COPY_AND_ASSIGN(BytecodePeepholeOptimizer);
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_
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