Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 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 |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |
| 6 | #define V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |
| 7 | |
| 8 | #include "src/interpreter/bytecode-pipeline.h" |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 9 | #include "src/interpreter/source-position-table.h" |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 10 | |
| 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | namespace interpreter { |
| 14 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 15 | class BytecodeLabel; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 16 | class SourcePositionTableBuilder; |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 17 | class ConstantArrayBuilder; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 18 | |
| 19 | // Class for emitting bytecode as the final stage of the bytecode |
| 20 | // generation pipeline. |
| 21 | class BytecodeArrayWriter final : public BytecodePipelineStage { |
| 22 | public: |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 23 | BytecodeArrayWriter(Isolate* isolate, Zone* zone, |
| 24 | ConstantArrayBuilder* constant_array_builder); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 25 | virtual ~BytecodeArrayWriter(); |
| 26 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 27 | // BytecodePipelineStage interface. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 28 | void Write(BytecodeNode* node) override; |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 29 | void WriteJump(BytecodeNode* node, BytecodeLabel* label) override; |
| 30 | void BindLabel(BytecodeLabel* label) override; |
| 31 | void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override; |
| 32 | Handle<BytecodeArray> ToBytecodeArray( |
| 33 | int fixed_register_count, int parameter_count, |
| 34 | Handle<FixedArray> handler_table) override; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 35 | |
| 36 | private: |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 37 | // Constants that act as placeholders for jump operands to be |
| 38 | // patched. These have operand sizes that match the sizes of |
| 39 | // reserved constant pool entries. |
| 40 | const uint32_t k8BitJumpPlaceholder = 0x7f; |
| 41 | const uint32_t k16BitJumpPlaceholder = |
| 42 | k8BitJumpPlaceholder | (k8BitJumpPlaceholder << 8); |
| 43 | const uint32_t k32BitJumpPlaceholder = |
| 44 | k16BitJumpPlaceholder | (k16BitJumpPlaceholder << 16); |
| 45 | |
| 46 | void PatchJump(size_t jump_target, size_t jump_location); |
| 47 | void PatchJumpWith8BitOperand(size_t jump_location, int delta); |
| 48 | void PatchJumpWith16BitOperand(size_t jump_location, int delta); |
| 49 | void PatchJumpWith32BitOperand(size_t jump_location, int delta); |
| 50 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 51 | void EmitBytecode(const BytecodeNode* const node); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 52 | void EmitJump(BytecodeNode* node, BytecodeLabel* label); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 53 | void UpdateSourcePositionTable(const BytecodeNode* const node); |
| 54 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 55 | Isolate* isolate() { return isolate_; } |
| 56 | ZoneVector<uint8_t>* bytecodes() { return &bytecodes_; } |
| 57 | SourcePositionTableBuilder* source_position_table_builder() { |
| 58 | return &source_position_table_builder_; |
| 59 | } |
| 60 | ConstantArrayBuilder* constant_array_builder() { |
| 61 | return constant_array_builder_; |
| 62 | } |
| 63 | int max_register_count() { return max_register_count_; } |
| 64 | |
| 65 | Isolate* isolate_; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 66 | ZoneVector<uint8_t> bytecodes_; |
| 67 | int max_register_count_; |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 68 | int unbound_jumps_; |
| 69 | SourcePositionTableBuilder source_position_table_builder_; |
| 70 | ConstantArrayBuilder* constant_array_builder_; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 71 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 72 | friend class BytecodeArrayWriterUnittest; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 73 | DISALLOW_COPY_AND_ASSIGN(BytecodeArrayWriter); |
| 74 | }; |
| 75 | |
| 76 | } // namespace interpreter |
| 77 | } // namespace internal |
| 78 | } // namespace v8 |
| 79 | |
| 80 | #endif // V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |