// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/interpreter/bytecode-decoder.h"
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#include <iomanip>
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#include "src/contexts.h"
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#include "src/interpreter/interpreter-intrinsics.h"
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#include "src/objects-inl.h"
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namespace v8 {
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namespace internal {
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namespace interpreter {
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// static
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Register BytecodeDecoder::DecodeRegisterOperand(Address operand_start,
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OperandType operand_type,
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OperandScale operand_scale) {
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DCHECK(Bytecodes::IsRegisterOperandType(operand_type));
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int32_t operand =
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DecodeSignedOperand(operand_start, operand_type, operand_scale);
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return Register::FromOperand(operand);
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}
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// static
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RegisterList BytecodeDecoder::DecodeRegisterListOperand(
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Address operand_start, uint32_t count, OperandType operand_type,
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OperandScale operand_scale) {
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Register first_reg =
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DecodeRegisterOperand(operand_start, operand_type, operand_scale);
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return RegisterList(first_reg.index(), static_cast<int>(count));
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}
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// static
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int32_t BytecodeDecoder::DecodeSignedOperand(Address operand_start,
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OperandType operand_type,
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OperandScale operand_scale) {
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DCHECK(!Bytecodes::IsUnsignedOperandType(operand_type));
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switch (Bytecodes::SizeOfOperand(operand_type, operand_scale)) {
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case OperandSize::kByte:
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return *reinterpret_cast<const int8_t*>(operand_start);
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case OperandSize::kShort:
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return static_cast<int16_t>(ReadUnalignedUInt16(operand_start));
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case OperandSize::kQuad:
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return static_cast<int32_t>(ReadUnalignedUInt32(operand_start));
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case OperandSize::kNone:
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UNREACHABLE();
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}
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return 0;
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}
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// static
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uint32_t BytecodeDecoder::DecodeUnsignedOperand(Address operand_start,
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OperandType operand_type,
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OperandScale operand_scale) {
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DCHECK(Bytecodes::IsUnsignedOperandType(operand_type));
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switch (Bytecodes::SizeOfOperand(operand_type, operand_scale)) {
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case OperandSize::kByte:
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return *reinterpret_cast<const uint8_t*>(operand_start);
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case OperandSize::kShort:
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return ReadUnalignedUInt16(operand_start);
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case OperandSize::kQuad:
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return ReadUnalignedUInt32(operand_start);
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case OperandSize::kNone:
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UNREACHABLE();
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}
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return 0;
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}
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namespace {
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const char* NameForRuntimeId(uint32_t idx) {
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switch (idx) {
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#define CASE(name, nargs, ressize) \
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case Runtime::k##name: \
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return #name; \
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case Runtime::kInline##name: \
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return "_" #name;
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FOR_EACH_INTRINSIC(CASE)
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#undef CASE
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default:
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UNREACHABLE();
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}
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}
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const char* NameForNativeContextIndex(uint32_t idx) {
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switch (idx) {
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#define CASE(index_name, type, name) \
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case Context::index_name: \
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return #name;
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NATIVE_CONTEXT_FIELDS(CASE)
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#undef CASE
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default:
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UNREACHABLE();
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}
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}
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} // anonymous namespace
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// static
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std::ostream& BytecodeDecoder::Decode(std::ostream& os,
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const uint8_t* bytecode_start,
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int parameter_count) {
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Bytecode bytecode = Bytecodes::FromByte(bytecode_start[0]);
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int prefix_offset = 0;
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OperandScale operand_scale = OperandScale::kSingle;
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if (Bytecodes::IsPrefixScalingBytecode(bytecode)) {
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prefix_offset = 1;
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operand_scale = Bytecodes::PrefixBytecodeToOperandScale(bytecode);
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bytecode = Bytecodes::FromByte(bytecode_start[1]);
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}
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// Prepare to print bytecode and operands as hex digits.
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std::ios saved_format(nullptr);
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saved_format.copyfmt(saved_format);
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os.fill('0');
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os.flags(std::ios::hex);
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int bytecode_size = Bytecodes::Size(bytecode, operand_scale);
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for (int i = 0; i < prefix_offset + bytecode_size; i++) {
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os << std::setw(2) << static_cast<uint32_t>(bytecode_start[i]) << ' ';
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}
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os.copyfmt(saved_format);
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const int kBytecodeColumnSize = 6;
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for (int i = prefix_offset + bytecode_size; i < kBytecodeColumnSize; i++) {
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os << " ";
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}
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os << Bytecodes::ToString(bytecode, operand_scale) << " ";
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// Operands for the debug break are from the original instruction.
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if (Bytecodes::IsDebugBreak(bytecode)) return os;
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int number_of_operands = Bytecodes::NumberOfOperands(bytecode);
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for (int i = 0; i < number_of_operands; i++) {
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OperandType op_type = Bytecodes::GetOperandType(bytecode, i);
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int operand_offset =
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Bytecodes::GetOperandOffset(bytecode, i, operand_scale);
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Address operand_start = reinterpret_cast<Address>(
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&bytecode_start[prefix_offset + operand_offset]);
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switch (op_type) {
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case interpreter::OperandType::kIdx:
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case interpreter::OperandType::kUImm:
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os << "["
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<< DecodeUnsignedOperand(operand_start, op_type, operand_scale)
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<< "]";
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break;
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case interpreter::OperandType::kIntrinsicId: {
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auto id = static_cast<IntrinsicsHelper::IntrinsicId>(
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DecodeUnsignedOperand(operand_start, op_type, operand_scale));
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os << "[" << NameForRuntimeId(IntrinsicsHelper::ToRuntimeId(id)) << "]";
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break;
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}
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case interpreter::OperandType::kNativeContextIndex: {
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auto id = DecodeUnsignedOperand(operand_start, op_type, operand_scale);
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os << "[" << NameForNativeContextIndex(id) << "]";
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break;
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}
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case interpreter::OperandType::kRuntimeId:
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os << "[" << NameForRuntimeId(DecodeUnsignedOperand(
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operand_start, op_type, operand_scale))
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<< "]";
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break;
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case interpreter::OperandType::kImm:
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os << "[" << DecodeSignedOperand(operand_start, op_type, operand_scale)
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<< "]";
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break;
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case interpreter::OperandType::kFlag8:
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os << "#"
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<< DecodeUnsignedOperand(operand_start, op_type, operand_scale);
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break;
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case interpreter::OperandType::kReg:
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case interpreter::OperandType::kRegOut: {
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Register reg =
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DecodeRegisterOperand(operand_start, op_type, operand_scale);
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os << reg.ToString(parameter_count);
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break;
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}
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case interpreter::OperandType::kRegOutTriple: {
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RegisterList reg_list =
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DecodeRegisterListOperand(operand_start, 3, op_type, operand_scale);
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os << reg_list.first_register().ToString(parameter_count) << "-"
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<< reg_list.last_register().ToString(parameter_count);
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break;
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}
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case interpreter::OperandType::kRegOutPair:
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case interpreter::OperandType::kRegPair: {
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RegisterList reg_list =
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DecodeRegisterListOperand(operand_start, 2, op_type, operand_scale);
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os << reg_list.first_register().ToString(parameter_count) << "-"
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<< reg_list.last_register().ToString(parameter_count);
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break;
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}
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case interpreter::OperandType::kRegOutList:
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case interpreter::OperandType::kRegList: {
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DCHECK_LT(i, number_of_operands - 1);
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DCHECK_EQ(Bytecodes::GetOperandType(bytecode, i + 1),
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OperandType::kRegCount);
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int reg_count_offset =
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Bytecodes::GetOperandOffset(bytecode, i + 1, operand_scale);
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Address reg_count_operand = reinterpret_cast<Address>(
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&bytecode_start[prefix_offset + reg_count_offset]);
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uint32_t count = DecodeUnsignedOperand(
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reg_count_operand, OperandType::kRegCount, operand_scale);
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RegisterList reg_list = DecodeRegisterListOperand(
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operand_start, count, op_type, operand_scale);
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os << reg_list.first_register().ToString(parameter_count) << "-"
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<< reg_list.last_register().ToString(parameter_count);
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i++; // Skip kRegCount.
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break;
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}
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case interpreter::OperandType::kNone:
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case interpreter::OperandType::kRegCount: // Dealt with in kRegList.
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UNREACHABLE();
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break;
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}
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if (i != number_of_operands - 1) {
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os << ", ";
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}
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}
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return os;
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}
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} // namespace interpreter
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} // namespace internal
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} // namespace v8
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