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