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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_OPTIMIZING_DEAD_CODE_ELIMINATION_H_
#define ART_COMPILER_OPTIMIZING_DEAD_CODE_ELIMINATION_H_
#include "nodes.h"
#include "optimization.h"
#include "optimizing_compiler_stats.h"
namespace art {
/**
* Optimization pass performing dead code elimination (removal of
* unused variables/instructions) on the SSA form.
*/
class HDeadCodeElimination : public HOptimization {
public:
HDeadCodeElimination(HGraph* graph,
OptimizingCompilerStats* stats = nullptr,
const char* name = kDeadCodeEliminationPassName)
: HOptimization(graph, name, stats) {}
void Run() OVERRIDE;
static constexpr const char* kDeadCodeEliminationPassName = "dead_code_elimination";
private:
void MaybeRecordDeadBlock(HBasicBlock* block);
void MaybeRecordSimplifyIf();
bool RemoveDeadBlocks();
void RemoveDeadInstructions();
bool SimplifyIfs();
void ConnectSuccessiveBlocks();
DISALLOW_COPY_AND_ASSIGN(HDeadCodeElimination);
};
} // namespace art
#endif // ART_COMPILER_OPTIMIZING_DEAD_CODE_ELIMINATION_H_