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      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_
     42