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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_DEAD_CODE_ELIMINATION_H_
#define V8_COMPILER_DEAD_CODE_ELIMINATION_H_
#include "src/compiler/graph-reducer.h"
namespace v8 {
namespace internal {
namespace compiler {
// Forward declarations.
class CommonOperatorBuilder;
// Propagates {Dead} control through the graph and thereby removes dead code.
// Note that this does not include trimming dead uses from the graph, and it
// also does not include detecting dead code by any other means than seeing a
// {Dead} control input; that is left to other reducers.
class DeadCodeElimination final : public AdvancedReducer {
public:
DeadCodeElimination(Editor* editor, Graph* graph,
CommonOperatorBuilder* common);
~DeadCodeElimination() final {}
Reduction Reduce(Node* node) final;
private:
Reduction ReduceEnd(Node* node);
Reduction ReduceLoopOrMerge(Node* node);
Reduction ReduceNode(Node* node);
void TrimMergeOrPhi(Node* node, int size);
Graph* graph() const { return graph_; }
CommonOperatorBuilder* common() const { return common_; }
Node* dead() const { return dead_; }
Graph* const graph_;
CommonOperatorBuilder* const common_;
Node* const dead_;
DISALLOW_COPY_AND_ASSIGN(DeadCodeElimination);
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_DEAD_CODE_ELIMINATION_H_
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