| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |
| #define V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |
| |
| #include "src/interpreter/bytecode-pipeline.h" |
| #include "src/source-position-table.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| class SourcePositionTableBuilder; |
| |
| namespace interpreter { |
| |
| class BytecodeLabel; |
| class ConstantArrayBuilder; |
| |
| // Class for emitting bytecode as the final stage of the bytecode |
| // generation pipeline. |
| class BytecodeArrayWriter final : public BytecodePipelineStage { |
| public: |
| BytecodeArrayWriter( |
| Zone* zone, ConstantArrayBuilder* constant_array_builder, |
| SourcePositionTableBuilder::RecordingMode source_position_mode); |
| virtual ~BytecodeArrayWriter(); |
| |
| // BytecodePipelineStage interface. |
| void Write(BytecodeNode* node) override; |
| void WriteJump(BytecodeNode* node, BytecodeLabel* label) override; |
| void BindLabel(BytecodeLabel* label) override; |
| void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override; |
| Handle<BytecodeArray> ToBytecodeArray( |
| Isolate* isolate, int register_count, int parameter_count, |
| Handle<FixedArray> handler_table) override; |
| |
| private: |
| // Maximum sized packed bytecode is comprised of a prefix bytecode, |
| // plus the actual bytecode, plus the maximum number of operands times |
| // the maximum operand size. |
| static const size_t kMaxSizeOfPackedBytecode = |
| 2 * sizeof(Bytecode) + |
| Bytecodes::kMaxOperands * static_cast<size_t>(OperandSize::kLast); |
| |
| // Constants that act as placeholders for jump operands to be |
| // patched. These have operand sizes that match the sizes of |
| // reserved constant pool entries. |
| const uint32_t k8BitJumpPlaceholder = 0x7f; |
| const uint32_t k16BitJumpPlaceholder = |
| k8BitJumpPlaceholder | (k8BitJumpPlaceholder << 8); |
| const uint32_t k32BitJumpPlaceholder = |
| k16BitJumpPlaceholder | (k16BitJumpPlaceholder << 16); |
| |
| void PatchJump(size_t jump_target, size_t jump_location); |
| void PatchJumpWith8BitOperand(size_t jump_location, int delta); |
| void PatchJumpWith16BitOperand(size_t jump_location, int delta); |
| void PatchJumpWith32BitOperand(size_t jump_location, int delta); |
| |
| void EmitBytecode(const BytecodeNode* const node); |
| void EmitJump(BytecodeNode* node, BytecodeLabel* label); |
| void UpdateSourcePositionTable(const BytecodeNode* const node); |
| |
| ZoneVector<uint8_t>* bytecodes() { return &bytecodes_; } |
| SourcePositionTableBuilder* source_position_table_builder() { |
| return &source_position_table_builder_; |
| } |
| ConstantArrayBuilder* constant_array_builder() { |
| return constant_array_builder_; |
| } |
| |
| ZoneVector<uint8_t> bytecodes_; |
| int unbound_jumps_; |
| SourcePositionTableBuilder source_position_table_builder_; |
| ConstantArrayBuilder* constant_array_builder_; |
| |
| friend class BytecodeArrayWriterUnittest; |
| DISALLOW_COPY_AND_ASSIGN(BytecodeArrayWriter); |
| }; |
| |
| } // namespace interpreter |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_ |