Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 1 | // Copyright 2016 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_INTERPRETER_BYTECODE_DEAD_CODE_OPTIMIZER_H_ |
| 6 | #define V8_INTERPRETER_BYTECODE_DEAD_CODE_OPTIMIZER_H_ |
| 7 | |
| 8 | #include "src/interpreter/bytecode-pipeline.h" |
| 9 | |
| 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | namespace interpreter { |
| 13 | |
| 14 | // An optimization stage for eliminating obviously dead code in bytecode |
| 15 | // generation. |
| 16 | class BytecodeDeadCodeOptimizer final : public BytecodePipelineStage, |
| 17 | public ZoneObject { |
| 18 | public: |
| 19 | explicit BytecodeDeadCodeOptimizer(BytecodePipelineStage* next_stage); |
| 20 | |
| 21 | // BytecodePipelineStage interface. |
| 22 | void Write(BytecodeNode* node) override; |
| 23 | void WriteJump(BytecodeNode* node, BytecodeLabel* label) override; |
| 24 | void BindLabel(BytecodeLabel* label) override; |
| 25 | void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override; |
| 26 | Handle<BytecodeArray> ToBytecodeArray( |
| 27 | int fixed_register_count, int parameter_count, |
| 28 | Handle<FixedArray> handler_table) override; |
| 29 | |
| 30 | private: |
| 31 | BytecodePipelineStage* next_stage_; |
| 32 | bool exit_seen_in_block_; |
| 33 | |
| 34 | DISALLOW_COPY_AND_ASSIGN(BytecodeDeadCodeOptimizer); |
| 35 | }; |
| 36 | |
| 37 | } // namespace interpreter |
| 38 | } // namespace internal |
| 39 | } // namespace v8 |
| 40 | |
| 41 | #endif // V8_INTERPRETER_BYTECODE_DEAD_CODE_OPTIMIZER_H_ |