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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_ARRAY_WRITER_H_ | 5 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |
6 #define V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ | 6 #define V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |
7 | 7 |
8 #include "src/interpreter/bytecode-pipeline.h" | 8 #include "src/interpreter/bytecode-pipeline.h" |
9 #include "src/source-position-table.h" | 9 #include "src/source-position-table.h" |
10 | 10 |
11 namespace v8 { | 11 namespace v8 { |
12 namespace internal { | 12 namespace internal { |
13 | 13 |
14 class SourcePositionTableBuilder; | 14 class SourcePositionTableBuilder; |
15 | 15 |
16 namespace interpreter { | 16 namespace interpreter { |
17 | 17 |
18 class BytecodeLabel; | 18 class BytecodeLabel; |
19 class ConstantArrayBuilder; | 19 class ConstantArrayBuilder; |
20 | 20 |
21 // Class for emitting bytecode as the final stage of the bytecode | 21 // Class for emitting bytecode as the final stage of the bytecode |
22 // generation pipeline. | 22 // generation pipeline. |
23 class BytecodeArrayWriter final : public BytecodePipelineStage { | 23 class BytecodeArrayWriter final : public BytecodePipelineStage { |
24 public: | 24 public: |
25 BytecodeArrayWriter( | 25 BytecodeArrayWriter( |
26 Isolate* isolate, Zone* zone, | 26 Zone* zone, ConstantArrayBuilder* constant_array_builder, |
27 ConstantArrayBuilder* constant_array_builder, | |
28 SourcePositionTableBuilder::RecordingMode source_position_mode); | 27 SourcePositionTableBuilder::RecordingMode source_position_mode); |
29 virtual ~BytecodeArrayWriter(); | 28 virtual ~BytecodeArrayWriter(); |
30 | 29 |
31 // BytecodePipelineStage interface. | 30 // BytecodePipelineStage interface. |
32 void Write(BytecodeNode* node) override; | 31 void Write(BytecodeNode* node) override; |
33 void WriteJump(BytecodeNode* node, BytecodeLabel* label) override; | 32 void WriteJump(BytecodeNode* node, BytecodeLabel* label) override; |
34 void BindLabel(BytecodeLabel* label) override; | 33 void BindLabel(BytecodeLabel* label) override; |
35 void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override; | 34 void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override; |
36 Handle<BytecodeArray> ToBytecodeArray( | 35 Handle<BytecodeArray> ToBytecodeArray( |
37 int fixed_register_count, int parameter_count, | 36 Isolate* isolate, int fixed_register_count, int parameter_count, |
38 Handle<FixedArray> handler_table) override; | 37 Handle<FixedArray> handler_table) override; |
39 | 38 |
40 private: | 39 private: |
41 // Maximum sized packed bytecode is comprised of a prefix bytecode, | 40 // Maximum sized packed bytecode is comprised of a prefix bytecode, |
42 // plus the actual bytecode, plus the maximum number of operands times | 41 // plus the actual bytecode, plus the maximum number of operands times |
43 // the maximum operand size. | 42 // the maximum operand size. |
44 static const size_t kMaxSizeOfPackedBytecode = | 43 static const size_t kMaxSizeOfPackedBytecode = |
45 2 * sizeof(Bytecode) + | 44 2 * sizeof(Bytecode) + |
46 Bytecodes::kMaxOperands * static_cast<size_t>(OperandSize::kLast); | 45 Bytecodes::kMaxOperands * static_cast<size_t>(OperandSize::kLast); |
47 | 46 |
48 // Constants that act as placeholders for jump operands to be | 47 // Constants that act as placeholders for jump operands to be |
49 // patched. These have operand sizes that match the sizes of | 48 // patched. These have operand sizes that match the sizes of |
50 // reserved constant pool entries. | 49 // reserved constant pool entries. |
51 const uint32_t k8BitJumpPlaceholder = 0x7f; | 50 const uint32_t k8BitJumpPlaceholder = 0x7f; |
52 const uint32_t k16BitJumpPlaceholder = | 51 const uint32_t k16BitJumpPlaceholder = |
53 k8BitJumpPlaceholder | (k8BitJumpPlaceholder << 8); | 52 k8BitJumpPlaceholder | (k8BitJumpPlaceholder << 8); |
54 const uint32_t k32BitJumpPlaceholder = | 53 const uint32_t k32BitJumpPlaceholder = |
55 k16BitJumpPlaceholder | (k16BitJumpPlaceholder << 16); | 54 k16BitJumpPlaceholder | (k16BitJumpPlaceholder << 16); |
56 | 55 |
57 void PatchJump(size_t jump_target, size_t jump_location); | 56 void PatchJump(size_t jump_target, size_t jump_location); |
58 void PatchJumpWith8BitOperand(size_t jump_location, int delta); | 57 void PatchJumpWith8BitOperand(size_t jump_location, int delta); |
59 void PatchJumpWith16BitOperand(size_t jump_location, int delta); | 58 void PatchJumpWith16BitOperand(size_t jump_location, int delta); |
60 void PatchJumpWith32BitOperand(size_t jump_location, int delta); | 59 void PatchJumpWith32BitOperand(size_t jump_location, int delta); |
61 | 60 |
62 void EmitBytecode(const BytecodeNode* const node); | 61 void EmitBytecode(const BytecodeNode* const node); |
63 void EmitJump(BytecodeNode* node, BytecodeLabel* label); | 62 void EmitJump(BytecodeNode* node, BytecodeLabel* label); |
64 void UpdateSourcePositionTable(const BytecodeNode* const node); | 63 void UpdateSourcePositionTable(const BytecodeNode* const node); |
65 | 64 |
66 Isolate* isolate() { return isolate_; } | |
67 ZoneVector<uint8_t>* bytecodes() { return &bytecodes_; } | 65 ZoneVector<uint8_t>* bytecodes() { return &bytecodes_; } |
68 SourcePositionTableBuilder* source_position_table_builder() { | 66 SourcePositionTableBuilder* source_position_table_builder() { |
69 return &source_position_table_builder_; | 67 return &source_position_table_builder_; |
70 } | 68 } |
71 ConstantArrayBuilder* constant_array_builder() { | 69 ConstantArrayBuilder* constant_array_builder() { |
72 return constant_array_builder_; | 70 return constant_array_builder_; |
73 } | 71 } |
74 int max_register_count() { return max_register_count_; } | 72 int max_register_count() { return max_register_count_; } |
75 | 73 |
76 Isolate* isolate_; | |
77 ZoneVector<uint8_t> bytecodes_; | 74 ZoneVector<uint8_t> bytecodes_; |
78 int max_register_count_; | 75 int max_register_count_; |
79 int unbound_jumps_; | 76 int unbound_jumps_; |
80 SourcePositionTableBuilder source_position_table_builder_; | 77 SourcePositionTableBuilder source_position_table_builder_; |
81 ConstantArrayBuilder* constant_array_builder_; | 78 ConstantArrayBuilder* constant_array_builder_; |
82 | 79 |
83 friend class BytecodeArrayWriterUnittest; | 80 friend class BytecodeArrayWriterUnittest; |
84 DISALLOW_COPY_AND_ASSIGN(BytecodeArrayWriter); | 81 DISALLOW_COPY_AND_ASSIGN(BytecodeArrayWriter); |
85 }; | 82 }; |
86 | 83 |
87 } // namespace interpreter | 84 } // namespace interpreter |
88 } // namespace internal | 85 } // namespace internal |
89 } // namespace v8 | 86 } // namespace v8 |
90 | 87 |
91 #endif // V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ | 88 #endif // V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |
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