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// Copyright 2016 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_ACCESSOR_H_
#define V8_INTERPRETER_BYTECODE_ARRAY_ACCESSOR_H_
#include <memory>
#include "src/base/optional.h"
#include "src/common/globals.h"
#include "src/handles/handles.h"
#include "src/interpreter/bytecode-register.h"
#include "src/interpreter/bytecodes.h"
#include "src/objects/objects.h"
#include "src/objects/smi.h"
#include "src/runtime/runtime.h"
namespace v8 {
namespace internal {
class BytecodeArray;
namespace interpreter {
class BytecodeArrayAccessor;
struct V8_EXPORT_PRIVATE JumpTableTargetOffset {
int case_value;
int target_offset;
};
class V8_EXPORT_PRIVATE JumpTableTargetOffsets final {
public:
// Minimal iterator implementation for use in ranged-for.
class V8_EXPORT_PRIVATE iterator final {
public:
iterator(int case_value, int table_offset, int table_end,
const BytecodeArrayAccessor* accessor);
JumpTableTargetOffset operator*();
iterator& operator++();
bool operator!=(const iterator& other);
private:
void UpdateAndAdvanceToValid();
const BytecodeArrayAccessor* accessor_;
Smi current_;
int index_;
int table_offset_;
int table_end_;
};
JumpTableTargetOffsets(const BytecodeArrayAccessor* accessor, int table_start,
int table_size, int case_value_base);
iterator begin() const;
iterator end() const;
int size() const;
private:
const BytecodeArrayAccessor* accessor_;
int table_start_;
int table_size_;
int case_value_base_;
};
class V8_EXPORT_PRIVATE AbstractBytecodeArray {
public:
virtual int length() const = 0;
virtual int parameter_count() const = 0;
virtual uint8_t get(int index) const = 0;
virtual void set(int index, uint8_t value) = 0;
virtual Address GetFirstBytecodeAddress() const = 0;
virtual Handle<Object> GetConstantAtIndex(int index,
Isolate* isolate) const = 0;
virtual bool IsConstantAtIndexSmi(int index) const = 0;
virtual Smi GetConstantAtIndexAsSmi(int index) const = 0;
virtual ~AbstractBytecodeArray() = default;
};
class V8_EXPORT_PRIVATE BytecodeArrayAccessor {
public:
BytecodeArrayAccessor(std::unique_ptr<AbstractBytecodeArray> bytecode_array,
int initial_offset);
BytecodeArrayAccessor(Handle<BytecodeArray> bytecode_array,
int initial_offset);
void SetOffset(int offset);
void ApplyDebugBreak();
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_; }
AbstractBytecodeArray* bytecode_array() const {
return bytecode_array_.get();
}
uint32_t GetFlagOperand(int operand_index) const;
uint32_t GetUnsignedImmediateOperand(int operand_index) const;
int32_t GetImmediateOperand(int operand_index) const;
uint32_t GetIndexOperand(int operand_index) const;
FeedbackSlot GetSlotOperand(int operand_index) const;
Register GetReceiver() const;
Register GetParameter(int parameter_index) const;
uint32_t GetRegisterCountOperand(int operand_index) const;
Register GetRegisterOperand(int operand_index) const;
int GetRegisterOperandRange(int operand_index) const;
Runtime::FunctionId GetRuntimeIdOperand(int operand_index) const;
Runtime::FunctionId GetIntrinsicIdOperand(int operand_index) const;
uint32_t GetNativeContextIndexOperand(int operand_index) const;
Handle<Object> GetConstantAtIndex(int offset, Isolate* isolate) const;
bool IsConstantAtIndexSmi(int offset) const;
Smi GetConstantAtIndexAsSmi(int offset) const;
Handle<Object> GetConstantForIndexOperand(int operand_index,
Isolate* isolate) const;
// Returns the relative 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. Returns a negative offset for backward jumps.
int GetRelativeJumpTargetOffset() 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;
// Returns an iterator over the absolute offsets of the targets of the current
// switch bytecode's jump table. It is an error to call this method if the
// bytecode is not a switch.
JumpTableTargetOffsets GetJumpTableTargetOffsets() const;
// Returns the absolute offset of the bytecode at the given relative offset
// from the current bytecode.
int GetAbsoluteOffset(int relative_offset) const;
bool OffsetWithinBytecode(int offset) const;
std::ostream& PrintTo(std::ostream& os) const;
private:
bool OffsetInBounds() const;
uint32_t GetUnsignedOperand(int operand_index,
OperandType operand_type) const;
int32_t GetSignedOperand(int operand_index, OperandType operand_type) const;
void UpdateOperandScale();
std::unique_ptr<AbstractBytecodeArray> bytecode_array_;
int bytecode_offset_;
OperandScale operand_scale_;
int prefix_offset_;
DISALLOW_COPY_AND_ASSIGN(BytecodeArrayAccessor);
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BYTECODE_ARRAY_ACCESSOR_H_