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// Copyright 2015 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_COMPILER_BACKEND_FRAME_ELIDER_H_
#define V8_COMPILER_BACKEND_FRAME_ELIDER_H_
#include "src/compiler/backend/instruction.h"
namespace v8 {
namespace internal {
namespace compiler {
// Determine which instruction blocks need a frame and where frames must be
// constructed/deconstructed.
class FrameElider {
public:
explicit FrameElider(InstructionSequence* code);
void Run();
private:
void MarkBlocks();
void PropagateMarks();
void MarkDeConstruction();
bool PropagateInOrder();
bool PropagateReversed();
bool PropagateIntoBlock(InstructionBlock* block);
const InstructionBlocks& instruction_blocks() const;
InstructionBlock* InstructionBlockAt(RpoNumber rpo_number) const;
Instruction* InstructionAt(int index) const;
InstructionSequence* const code_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_BACKEND_FRAME_ELIDER_H_
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