| // 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(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) \ |
| \ |
| /* 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) \ |
| \ |
| /* Control Flow */ \ |
| 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_ |