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// 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/base/compiler-specific.h"
#include "src/globals.h"
#include "src/interpreter/bytecodes.h"
#include "src/source-position-table.h"
namespace v8 {
namespace internal {
class BytecodeArray;
class SourcePositionTableBuilder;
namespace interpreter {
class BytecodeLabel;
class BytecodeLoopHeader;
class BytecodeNode;
class BytecodeJumpTable;
class ConstantArrayBuilder;
class HandlerTableBuilder;
namespace bytecode_array_writer_unittest {
class BytecodeArrayWriterUnittest;
} // namespace bytecode_array_writer_unittest
// Class for emitting bytecode as the final stage of the bytecode
// generation pipeline.
class V8_EXPORT_PRIVATE BytecodeArrayWriter final {
public:
BytecodeArrayWriter(
Zone* zone, ConstantArrayBuilder* constant_array_builder,
SourcePositionTableBuilder::RecordingMode source_position_mode);
void Write(BytecodeNode* node);
void WriteJump(BytecodeNode* node, BytecodeLabel* label);
void WriteJumpLoop(BytecodeNode* node, BytecodeLoopHeader* loop_header);
void WriteSwitch(BytecodeNode* node, BytecodeJumpTable* jump_table);
void BindLabel(BytecodeLabel* label);
void BindLoopHeader(BytecodeLoopHeader* loop_header);
void BindJumpTableEntry(BytecodeJumpTable* jump_table, int case_value);
void BindHandlerTarget(HandlerTableBuilder* handler_table_builder,
int handler_id);
void BindTryRegionStart(HandlerTableBuilder* handler_table_builder,
int handler_id);
void BindTryRegionEnd(HandlerTableBuilder* handler_table_builder,
int handler_id);
Handle<BytecodeArray> ToBytecodeArray(Isolate* isolate, int register_count,
int parameter_count,
Handle<ByteArray> handler_table);
bool RemainderOfBlockIsDead() const { return exit_seen_in_block_; }
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 EmitJumpLoop(BytecodeNode* node, BytecodeLoopHeader* loop_header);
void EmitSwitch(BytecodeNode* node, BytecodeJumpTable* jump_table);
void UpdateSourcePositionTable(const BytecodeNode* const node);
void UpdateExitSeenInBlock(Bytecode bytecode);
void MaybeElideLastBytecode(Bytecode next_bytecode, bool has_source_info);
void InvalidateLastBytecode();
void StartBasicBlock();
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_;
Bytecode last_bytecode_;
size_t last_bytecode_offset_;
bool last_bytecode_had_source_info_;
bool elide_noneffectful_bytecodes_;
bool exit_seen_in_block_;
friend class bytecode_array_writer_unittest::BytecodeArrayWriterUnittest;
DISALLOW_COPY_AND_ASSIGN(BytecodeArrayWriter);
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_