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1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ | 5 #ifndef V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ |
6 #define V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ | 6 #define V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ |
7 | 7 |
8 #include "src/interpreter/bytecode-pipeline.h" | 8 #include "src/interpreter/bytecode-pipeline.h" |
9 | 9 |
10 namespace v8 { | 10 namespace v8 { |
11 namespace internal { | 11 namespace internal { |
12 namespace interpreter { | 12 namespace interpreter { |
13 | 13 |
14 class ConstantArrayBuilder; | 14 class ConstantArrayBuilder; |
15 | 15 |
16 // An optimization stage for performing peephole optimizations on | 16 // An optimization stage for performing peephole optimizations on |
17 // generated bytecode. The optimizer may buffer one bytecode | 17 // generated bytecode. The optimizer may buffer one bytecode |
18 // internally. | 18 // internally. |
19 class BytecodePeepholeOptimizer final : public BytecodePipelineStage, | 19 class BytecodePeepholeOptimizer final : public BytecodePipelineStage, |
20 public ZoneObject { | 20 public ZoneObject { |
21 public: | 21 public: |
22 BytecodePeepholeOptimizer(ConstantArrayBuilder* constant_array_builder, | 22 BytecodePeepholeOptimizer(ConstantArrayBuilder* constant_array_builder, |
23 BytecodePipelineStage* next_stage); | 23 BytecodePipelineStage* next_stage); |
24 | 24 |
25 // BytecodePipelineStage interface. | 25 // BytecodePipelineStage interface. |
26 void Write(BytecodeNode* node) override; | 26 void Write(BytecodeNode* node) override; |
27 size_t FlushForOffset() override; | 27 void WriteJump(BytecodeNode* node, BytecodeLabel* label) override; |
28 void FlushBasicBlock() override; | 28 void BindLabel(BytecodeLabel* label) override; |
| 29 void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override; |
| 30 Handle<BytecodeArray> ToBytecodeArray( |
| 31 int fixed_register_count, int parameter_count, |
| 32 Handle<FixedArray> handler_table) override; |
29 | 33 |
30 private: | 34 private: |
| 35 BytecodeNode* OptimizeAndEmitLast(BytecodeNode* current); |
31 BytecodeNode* Optimize(BytecodeNode* current); | 36 BytecodeNode* Optimize(BytecodeNode* current); |
| 37 void Flush(); |
32 | 38 |
33 void TryToRemoveLastExpressionPosition(const BytecodeNode* const current); | 39 void TryToRemoveLastExpressionPosition(const BytecodeNode* const current); |
34 bool TransformLastAndCurrentBytecodes(BytecodeNode* const current); | 40 bool TransformLastAndCurrentBytecodes(BytecodeNode* const current); |
35 bool CanElideCurrent(const BytecodeNode* const current) const; | 41 bool CanElideCurrent(const BytecodeNode* const current) const; |
36 bool CanElideLast(const BytecodeNode* const current) const; | 42 bool CanElideLast(const BytecodeNode* const current) const; |
37 bool CanElideLastBasedOnSourcePosition( | 43 bool CanElideLastBasedOnSourcePosition( |
38 const BytecodeNode* const current) const; | 44 const BytecodeNode* const current) const; |
39 | 45 |
40 // Simple substitution methods. | 46 // Simple substitution methods. |
41 bool RemoveToBooleanFromJump(BytecodeNode* const current); | 47 bool RemoveToBooleanFromJump(BytecodeNode* const current); |
42 bool RemoveToBooleanFromLogicalNot(BytecodeNode* const current); | 48 bool RemoveToBooleanFromLogicalNot(BytecodeNode* const current); |
43 bool ChangeLdaToLdr(BytecodeNode* const current); | 49 bool ChangeLdaToLdr(BytecodeNode* const current); |
44 | 50 |
45 void InvalidateLast(); | 51 void InvalidateLast(); |
46 bool LastIsValid() const; | 52 bool LastIsValid() const; |
47 void SetLast(const BytecodeNode* const node); | 53 void SetLast(const BytecodeNode* const node); |
48 | 54 |
49 bool LastBytecodePutsNameInAccumulator() const; | 55 bool LastBytecodePutsNameInAccumulator() const; |
50 | 56 |
51 Handle<Object> GetConstantForIndexOperand(const BytecodeNode* const node, | 57 Handle<Object> GetConstantForIndexOperand(const BytecodeNode* const node, |
52 int index) const; | 58 int index) const; |
53 | 59 |
54 ConstantArrayBuilder* constant_array_builder_; | 60 ConstantArrayBuilder* constant_array_builder_; |
55 BytecodePipelineStage* next_stage_; | 61 BytecodePipelineStage* next_stage_; |
56 BytecodeNode last_; | 62 BytecodeNode last_; |
57 bool last_is_discardable_; | |
58 | 63 |
59 DISALLOW_COPY_AND_ASSIGN(BytecodePeepholeOptimizer); | 64 DISALLOW_COPY_AND_ASSIGN(BytecodePeepholeOptimizer); |
60 }; | 65 }; |
61 | 66 |
62 } // namespace interpreter | 67 } // namespace interpreter |
63 } // namespace internal | 68 } // namespace internal |
64 } // namespace v8 | 69 } // namespace v8 |
65 | 70 |
66 #endif // V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ | 71 #endif // V8_INTERPRETER_BYTECODE_PEEPHOLE_OPTIMIZER_H_ |
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