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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.
#include "src/interpreter/bytecodes.h"
#include "src/interpreter/bytecode-array-builder.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
std::ostream& Bytecodes::Decode(std::ostream& os,
const uint8_t* bytecode_start) {
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::kImm8:
os << "#" << static_cast<int>(operand);
break;
case interpreter::OperandType::kReg:
os << "r" << Register::FromOperand(operand).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);
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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