| // 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/base/compiler-specific.h" |
| #include "src/compiler/graph-reducer.h" |
| #include "src/globals.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 V8_EXPORT_PRIVATE DeadCodeElimination final |
| : public NON_EXPORTED_BASE(AdvancedReducer) { |
| public: |
| DeadCodeElimination(Editor* editor, Graph* graph, |
| CommonOperatorBuilder* common); |
| ~DeadCodeElimination() final {} |
| |
| const char* reducer_name() const override { return "DeadCodeElimination"; } |
| |
| Reduction Reduce(Node* node) final; |
| |
| private: |
| Reduction ReduceEnd(Node* node); |
| Reduction ReduceLoopOrMerge(Node* node); |
| Reduction ReduceLoopExit(Node* node); |
| Reduction ReduceNode(Node* node); |
| |
| Reduction RemoveLoopExit(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_ |