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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_BYTECODES_H_
#define V8_INTERPRETER_BYTECODES_H_
#include <iosfwd>
// Clients of this interface shouldn't depend on lots of interpreter internals.
// Do not include anything from src/interpreter here!
#include "src/utils.h"
namespace v8 {
namespace internal {
namespace interpreter {
// The list of operand types used by bytecodes.
#define OPERAND_TYPE_LIST(V) \
V(None) \
V(Count) \
V(Imm8) \
V(Idx) \
V(Reg)
// The list of bytecodes which are interpreted by the interpreter.
#define BYTECODE_LIST(V) \
\
/* Loading the accumulator */ \
V(LdaZero, OperandType::kNone) \
V(LdaSmi8, OperandType::kImm8) \
V(LdaConstant, OperandType::kIdx) \
V(LdaUndefined, OperandType::kNone) \
V(LdaNull, OperandType::kNone) \
V(LdaTheHole, OperandType::kNone) \
V(LdaTrue, OperandType::kNone) \
V(LdaFalse, OperandType::kNone) \
\
/* Load globals */ \
V(LdaGlobal, OperandType::kIdx) \
\
/* Register-accumulator transfers */ \
V(Ldar, OperandType::kReg) \
V(Star, OperandType::kReg) \
\
/* LoadIC operations */ \
V(LoadIC, OperandType::kReg, OperandType::kIdx) \
V(KeyedLoadIC, OperandType::kReg, OperandType::kIdx) \
\
/* StoreIC operations */ \
V(StoreIC, OperandType::kReg, OperandType::kReg, OperandType::kIdx) \
V(KeyedStoreIC, OperandType::kReg, OperandType::kReg, OperandType::kIdx) \
\
/* Binary Operators */ \
V(Add, OperandType::kReg) \
V(Sub, OperandType::kReg) \
V(Mul, OperandType::kReg) \
V(Div, OperandType::kReg) \
V(Mod, OperandType::kReg) \
\
/* Call operations. */ \
V(Call, OperandType::kReg, OperandType::kReg, OperandType::kCount) \
\
/* Test Operators */ \
V(TestEqual, OperandType::kReg) \
V(TestNotEqual, OperandType::kReg) \
V(TestEqualStrict, OperandType::kReg) \
V(TestNotEqualStrict, OperandType::kReg) \
V(TestLessThan, OperandType::kReg) \
V(TestGreaterThan, OperandType::kReg) \
V(TestLessThanOrEqual, OperandType::kReg) \
V(TestGreaterThanOrEqual, OperandType::kReg) \
V(TestInstanceOf, OperandType::kReg) \
V(TestIn, OperandType::kReg) \
\
/* Cast operators */ \
V(ToBoolean, OperandType::kNone) \
\
/* Control Flow */ \
V(Jump, OperandType::kImm8) \
V(JumpConstant, OperandType::kIdx) \
V(JumpIfTrue, OperandType::kImm8) \
V(JumpIfTrueConstant, OperandType::kIdx) \
V(JumpIfFalse, OperandType::kImm8) \
V(JumpIfFalseConstant, OperandType::kIdx) \
V(Return, OperandType::kNone)
// Enumeration of operand types used by bytecodes.
enum class OperandType : uint8_t {
#define DECLARE_OPERAND_TYPE(Name) k##Name,
OPERAND_TYPE_LIST(DECLARE_OPERAND_TYPE)
#undef DECLARE_OPERAND_TYPE
#define COUNT_OPERAND_TYPES(x) +1
// The COUNT_OPERAND macro will turn this into kLast = -1 +1 +1... which will
// evaluate to the same value as the last operand.
kLast = -1 OPERAND_TYPE_LIST(COUNT_OPERAND_TYPES)
#undef COUNT_OPERAND_TYPES
};
// Enumeration of interpreter bytecodes.
enum class Bytecode : uint8_t {
#define DECLARE_BYTECODE(Name, ...) k##Name,
BYTECODE_LIST(DECLARE_BYTECODE)
#undef DECLARE_BYTECODE
#define COUNT_BYTECODE(x, ...) +1
// The COUNT_BYTECODE macro will turn this into kLast = -1 +1 +1... which will
// evaluate to the same value as the last real bytecode.
kLast = -1 BYTECODE_LIST(COUNT_BYTECODE)
#undef COUNT_BYTECODE
};
// An interpreter register which is located in the function's register file
// in its stack-frame. Register hold parameters, this, and expression values.
class Register {
public:
static const int kMaxRegisterIndex = 127;
static const int kMinRegisterIndex = -128;
Register() : index_(kIllegalIndex) {}
explicit Register(int index) : index_(index) {
DCHECK_LE(index_, kMaxRegisterIndex);
DCHECK_GE(index_, kMinRegisterIndex);
}
int index() const {
DCHECK(index_ != kIllegalIndex);
return index_;
}
bool is_parameter() const { return index() < 0; }
static Register FromParameterIndex(int index, int parameter_count);
int ToParameterIndex(int parameter_count) const;
static int MaxParameterIndex();
static Register FromOperand(uint8_t operand);
uint8_t ToOperand() const;
private:
static const int kIllegalIndex = kMaxInt;
void* operator new(size_t size);
void operator delete(void* p);
int index_;
};
class Bytecodes {
public:
// Returns string representation of |bytecode|.
static const char* ToString(Bytecode bytecode);
// Returns string representation of |operand_type|.
static const char* OperandTypeToString(OperandType operand_type);
// Returns byte value of bytecode.
static uint8_t ToByte(Bytecode bytecode);
// Returns bytecode for |value|.
static Bytecode FromByte(uint8_t value);
// Returns the number of operands expected by |bytecode|.
static int NumberOfOperands(Bytecode bytecode);
// Return the i-th operand of |bytecode|.
static OperandType GetOperandType(Bytecode bytecode, int i);
// Returns the size of the bytecode including its operands.
static int Size(Bytecode bytecode);
// The maximum number of operands across all bytecodes.
static int MaximumNumberOfOperands();
// Maximum size of a bytecode and its operands.
static int MaximumSize();
// Decode a single bytecode and operands to |os|.
static std::ostream& Decode(std::ostream& os, const uint8_t* bytecode_start,
int number_of_parameters);
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(Bytecodes);
};
std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BYTECODES_H_
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