| // 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. |
| |
| #include "src/interpreter/bytecodes.h" |
| |
| #include "src/frames.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace interpreter { |
| |
| // Maximum number of operands a bytecode may have. |
| static const int kMaxOperands = 3; |
| |
| // kBytecodeTable relies on kNone being the same as zero to detect length. |
| STATIC_ASSERT(static_cast<int>(OperandType::kNone) == 0); |
| |
| static const OperandType kBytecodeTable[][kMaxOperands] = { |
| #define DECLARE_OPERAND(_, ...) \ |
| { __VA_ARGS__ } \ |
| , |
| BYTECODE_LIST(DECLARE_OPERAND) |
| #undef DECLARE_OPERAND |
| }; |
| |
| |
| // static |
| const char* Bytecodes::ToString(Bytecode bytecode) { |
| switch (bytecode) { |
| #define CASE(Name, ...) \ |
| case Bytecode::k##Name: \ |
| return #Name; |
| BYTECODE_LIST(CASE) |
| #undef CASE |
| } |
| UNREACHABLE(); |
| return ""; |
| } |
| |
| |
| // static |
| const char* Bytecodes::OperandTypeToString(OperandType operand_type) { |
| switch (operand_type) { |
| #define CASE(Name) \ |
| case OperandType::k##Name: \ |
| return #Name; |
| OPERAND_TYPE_LIST(CASE) |
| #undef CASE |
| } |
| UNREACHABLE(); |
| return ""; |
| } |
| |
| |
| // static |
| uint8_t Bytecodes::ToByte(Bytecode bytecode) { |
| return static_cast<uint8_t>(bytecode); |
| } |
| |
| |
| // static |
| Bytecode Bytecodes::FromByte(uint8_t value) { |
| Bytecode bytecode = static_cast<Bytecode>(value); |
| DCHECK(bytecode <= Bytecode::kLast); |
| return bytecode; |
| } |
| |
| |
| // static |
| int Bytecodes::NumberOfOperands(Bytecode bytecode) { |
| DCHECK(bytecode <= Bytecode::kLast); |
| int count; |
| uint8_t row = ToByte(bytecode); |
| for (count = 0; count < kMaxOperands; count++) { |
| if (kBytecodeTable[row][count] == OperandType::kNone) { |
| break; |
| } |
| } |
| return count; |
| } |
| |
| |
| // static |
| OperandType Bytecodes::GetOperandType(Bytecode bytecode, int i) { |
| DCHECK(bytecode <= Bytecode::kLast && i < NumberOfOperands(bytecode)); |
| return kBytecodeTable[ToByte(bytecode)][i]; |
| } |
| |
| |
| // static |
| int Bytecodes::Size(Bytecode bytecode) { |
| return 1 + NumberOfOperands(bytecode); |
| } |
| |
| |
| // static |
| int Bytecodes::MaximumNumberOfOperands() { return kMaxOperands; } |
| |
| |
| // static |
| int Bytecodes::MaximumSize() { return 1 + kMaxOperands; } |
| |
| |
| // static |
| bool Bytecodes::IsJump(Bytecode bytecode) { |
| return bytecode == Bytecode::kJump || bytecode == Bytecode::kJumpIfTrue || |
| bytecode == Bytecode::kJumpIfFalse; |
| } |
| |
| |
| // static |
| bool Bytecodes::IsJumpConstant(Bytecode bytecode) { |
| return bytecode == Bytecode::kJumpConstant || |
| bytecode == Bytecode::kJumpIfTrueConstant || |
| bytecode == Bytecode::kJumpIfFalseConstant; |
| } |
| |
| |
| // static |
| std::ostream& Bytecodes::Decode(std::ostream& os, const uint8_t* bytecode_start, |
| int parameter_count) { |
| Vector<char> buf = Vector<char>::New(50); |
| |
| Bytecode bytecode = Bytecodes::FromByte(bytecode_start[0]); |
| int bytecode_size = Bytecodes::Size(bytecode); |
| |
| for (int i = 0; i < bytecode_size; i++) { |
| SNPrintF(buf, "%02x ", bytecode_start[i]); |
| os << buf.start(); |
| } |
| for (int i = bytecode_size; i < Bytecodes::MaximumSize(); i++) { |
| os << " "; |
| } |
| |
| os << bytecode << " "; |
| |
| const uint8_t* operands_start = bytecode_start + 1; |
| int operands_size = bytecode_size - 1; |
| for (int i = 0; i < operands_size; i++) { |
| OperandType op_type = GetOperandType(bytecode, i); |
| uint8_t operand = operands_start[i]; |
| switch (op_type) { |
| case interpreter::OperandType::kCount: |
| os << "#" << static_cast<unsigned int>(operand); |
| break; |
| case interpreter::OperandType::kIdx: |
| os << "[" << static_cast<unsigned int>(operand) << "]"; |
| break; |
| case interpreter::OperandType::kImm8: |
| os << "#" << static_cast<int>(static_cast<int8_t>(operand)); |
| break; |
| case interpreter::OperandType::kReg: { |
| Register reg = Register::FromOperand(operand); |
| if (reg.is_parameter()) { |
| int parameter_index = reg.ToParameterIndex(parameter_count); |
| if (parameter_index == 0) { |
| os << "<this>"; |
| } else { |
| os << "a" << parameter_index - 1; |
| } |
| } else { |
| os << "r" << reg.index(); |
| } |
| break; |
| } |
| case interpreter::OperandType::kNone: |
| UNREACHABLE(); |
| break; |
| } |
| if (i != operands_size - 1) { |
| os << ", "; |
| } |
| } |
| return os; |
| } |
| |
| |
| std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode) { |
| return os << Bytecodes::ToString(bytecode); |
| } |
| |
| |
| std::ostream& operator<<(std::ostream& os, const OperandType& operand_type) { |
| return os << Bytecodes::OperandTypeToString(operand_type); |
| } |
| |
| |
| static const int kLastParamRegisterIndex = |
| -InterpreterFrameConstants::kLastParamFromRegisterPointer / kPointerSize; |
| |
| |
| // Registers occupy range 0-127 in 8-bit value leaving 128 unused values. |
| // Parameter indices are biased with the negative value kLastParamRegisterIndex |
| // for ease of access in the interpreter. |
| static const int kMaxParameterIndex = 128 + kLastParamRegisterIndex; |
| |
| |
| Register Register::FromParameterIndex(int index, int parameter_count) { |
| DCHECK_GE(index, 0); |
| DCHECK_LT(index, parameter_count); |
| DCHECK_LE(parameter_count, kMaxParameterIndex + 1); |
| int register_index = kLastParamRegisterIndex - parameter_count + index + 1; |
| DCHECK_LT(register_index, 0); |
| DCHECK_GE(register_index, Register::kMinRegisterIndex); |
| return Register(register_index); |
| } |
| |
| |
| int Register::ToParameterIndex(int parameter_count) const { |
| DCHECK(is_parameter()); |
| return index() - kLastParamRegisterIndex + parameter_count - 1; |
| } |
| |
| |
| int Register::MaxParameterIndex() { return kMaxParameterIndex; } |
| |
| |
| uint8_t Register::ToOperand() const { return static_cast<uint8_t>(-index_); } |
| |
| |
| Register Register::FromOperand(uint8_t operand) { |
| return Register(-static_cast<int8_t>(operand)); |
| } |
| |
| } // namespace interpreter |
| } // namespace internal |
| } // namespace v8 |