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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_ITERATOR_H_
#define V8_INTERPRETER_BYTECODE_ARRAY_ITERATOR_H_
#include "src/handles.h"
#include "src/interpreter/bytecodes.h"
#include "src/objects.h"
namespace v8 {
namespace internal {
namespace interpreter {
class BytecodeArrayIterator {
public:
explicit BytecodeArrayIterator(Handle<BytecodeArray> bytecode_array);
void Advance();
bool done() const;
Bytecode current_bytecode() const;
int current_bytecode_size() const;
int current_offset() const { return bytecode_offset_; }
OperandScale current_operand_scale() const { return operand_scale_; }
int current_prefix_offset() const { return prefix_offset_; }
const Handle<BytecodeArray>& bytecode_array() const {
return bytecode_array_;
}
uint32_t GetFlagOperand(int operand_index) const;
int32_t GetImmediateOperand(int operand_index) const;
uint32_t GetIndexOperand(int operand_index) const;
uint32_t GetRegisterCountOperand(int operand_index) const;
Register GetRegisterOperand(int operand_index) const;
int GetRegisterOperandRange(int operand_index) const;
uint32_t GetRuntimeIdOperand(int operand_index) const;
Handle<Object> GetConstantForIndexOperand(int operand_index) const;
// Returns the absolute offset of the branch target at the current
// bytecode. It is an error to call this method if the bytecode is
// not for a jump or conditional jump.
int GetJumpTargetOffset() const;
private:
uint32_t GetUnsignedOperand(int operand_index,
OperandType operand_type) const;
int32_t GetSignedOperand(int operand_index, OperandType operand_type) const;
void UpdateOperandScale();
Handle<BytecodeArray> bytecode_array_;
int bytecode_offset_;
OperandScale operand_scale_;
int prefix_offset_;
DISALLOW_COPY_AND_ASSIGN(BytecodeArrayIterator);
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BYTECODE_GRAPH_ITERATOR_H_
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