| // 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/bytecode-decoder.h" |
| |
| #include <iomanip> |
| |
| #include "src/interpreter/interpreter-intrinsics.h" |
| #include "src/objects/contexts.h" |
| #include "src/objects/objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace interpreter { |
| |
| // static |
| Register BytecodeDecoder::DecodeRegisterOperand(Address operand_start, |
| OperandType operand_type, |
| OperandScale operand_scale) { |
| DCHECK(Bytecodes::IsRegisterOperandType(operand_type)); |
| int32_t operand = |
| DecodeSignedOperand(operand_start, operand_type, operand_scale); |
| return Register::FromOperand(operand); |
| } |
| |
| // static |
| RegisterList BytecodeDecoder::DecodeRegisterListOperand( |
| Address operand_start, uint32_t count, OperandType operand_type, |
| OperandScale operand_scale) { |
| Register first_reg = |
| DecodeRegisterOperand(operand_start, operand_type, operand_scale); |
| return RegisterList(first_reg.index(), static_cast<int>(count)); |
| } |
| |
| // static |
| int32_t BytecodeDecoder::DecodeSignedOperand(Address operand_start, |
| OperandType operand_type, |
| OperandScale operand_scale) { |
| DCHECK(!Bytecodes::IsUnsignedOperandType(operand_type)); |
| switch (Bytecodes::SizeOfOperand(operand_type, operand_scale)) { |
| case OperandSize::kByte: |
| return *reinterpret_cast<const int8_t*>(operand_start); |
| case OperandSize::kShort: |
| return static_cast<int16_t>( |
| base::ReadUnalignedValue<uint16_t>(operand_start)); |
| case OperandSize::kQuad: |
| return static_cast<int32_t>( |
| base::ReadUnalignedValue<uint32_t>(operand_start)); |
| case OperandSize::kNone: |
| UNREACHABLE(); |
| } |
| return 0; |
| } |
| |
| // static |
| uint32_t BytecodeDecoder::DecodeUnsignedOperand(Address operand_start, |
| OperandType operand_type, |
| OperandScale operand_scale) { |
| DCHECK(Bytecodes::IsUnsignedOperandType(operand_type)); |
| switch (Bytecodes::SizeOfOperand(operand_type, operand_scale)) { |
| case OperandSize::kByte: |
| return *reinterpret_cast<const uint8_t*>(operand_start); |
| case OperandSize::kShort: |
| return base::ReadUnalignedValue<uint16_t>(operand_start); |
| case OperandSize::kQuad: |
| return base::ReadUnalignedValue<uint32_t>(operand_start); |
| case OperandSize::kNone: |
| UNREACHABLE(); |
| } |
| return 0; |
| } |
| |
| namespace { |
| |
| const char* NameForRuntimeId(Runtime::FunctionId idx) { |
| return Runtime::FunctionForId(idx)->name; |
| } |
| |
| const char* NameForNativeContextIndex(uint32_t idx) { |
| switch (idx) { |
| #define CASE(index_name, type, name) \ |
| case Context::index_name: \ |
| return #name; |
| NATIVE_CONTEXT_FIELDS(CASE) |
| #undef CASE |
| default: |
| UNREACHABLE(); |
| } |
| } |
| |
| } // anonymous namespace |
| |
| // static |
| std::ostream& BytecodeDecoder::Decode(std::ostream& os, |
| const uint8_t* bytecode_start, |
| int parameter_count) { |
| Bytecode bytecode = Bytecodes::FromByte(bytecode_start[0]); |
| int prefix_offset = 0; |
| OperandScale operand_scale = OperandScale::kSingle; |
| if (Bytecodes::IsPrefixScalingBytecode(bytecode)) { |
| prefix_offset = 1; |
| operand_scale = Bytecodes::PrefixBytecodeToOperandScale(bytecode); |
| bytecode = Bytecodes::FromByte(bytecode_start[1]); |
| } |
| |
| // Prepare to print bytecode and operands as hex digits. |
| std::ios saved_format(nullptr); |
| saved_format.copyfmt(saved_format); |
| os.fill('0'); |
| os.flags(std::ios::hex); |
| |
| int bytecode_size = Bytecodes::Size(bytecode, operand_scale); |
| for (int i = 0; i < prefix_offset + bytecode_size; i++) { |
| os << std::setw(2) << static_cast<uint32_t>(bytecode_start[i]) << ' '; |
| } |
| os.copyfmt(saved_format); |
| |
| const int kBytecodeColumnSize = 6; |
| for (int i = prefix_offset + bytecode_size; i < kBytecodeColumnSize; i++) { |
| os << " "; |
| } |
| |
| os << Bytecodes::ToString(bytecode, operand_scale) << " "; |
| |
| // Operands for the debug break are from the original instruction. |
| if (Bytecodes::IsDebugBreak(bytecode)) return os; |
| |
| int number_of_operands = Bytecodes::NumberOfOperands(bytecode); |
| for (int i = 0; i < number_of_operands; i++) { |
| OperandType op_type = Bytecodes::GetOperandType(bytecode, i); |
| int operand_offset = |
| Bytecodes::GetOperandOffset(bytecode, i, operand_scale); |
| Address operand_start = reinterpret_cast<Address>( |
| &bytecode_start[prefix_offset + operand_offset]); |
| switch (op_type) { |
| case interpreter::OperandType::kIdx: |
| case interpreter::OperandType::kUImm: |
| os << "[" |
| << DecodeUnsignedOperand(operand_start, op_type, operand_scale) |
| << "]"; |
| break; |
| case interpreter::OperandType::kIntrinsicId: { |
| auto id = static_cast<IntrinsicsHelper::IntrinsicId>( |
| DecodeUnsignedOperand(operand_start, op_type, operand_scale)); |
| os << "[" << NameForRuntimeId(IntrinsicsHelper::ToRuntimeId(id)) << "]"; |
| break; |
| } |
| case interpreter::OperandType::kNativeContextIndex: { |
| auto id = DecodeUnsignedOperand(operand_start, op_type, operand_scale); |
| os << "[" << NameForNativeContextIndex(id) << "]"; |
| break; |
| } |
| case interpreter::OperandType::kRuntimeId: |
| os << "[" |
| << NameForRuntimeId(static_cast<Runtime::FunctionId>( |
| DecodeUnsignedOperand(operand_start, op_type, operand_scale))) |
| << "]"; |
| break; |
| case interpreter::OperandType::kImm: |
| os << "[" << DecodeSignedOperand(operand_start, op_type, operand_scale) |
| << "]"; |
| break; |
| case interpreter::OperandType::kFlag8: |
| os << "#" |
| << DecodeUnsignedOperand(operand_start, op_type, operand_scale); |
| break; |
| case interpreter::OperandType::kReg: |
| case interpreter::OperandType::kRegOut: { |
| Register reg = |
| DecodeRegisterOperand(operand_start, op_type, operand_scale); |
| os << reg.ToString(parameter_count); |
| break; |
| } |
| case interpreter::OperandType::kRegOutTriple: { |
| RegisterList reg_list = |
| DecodeRegisterListOperand(operand_start, 3, op_type, operand_scale); |
| os << reg_list.first_register().ToString(parameter_count) << "-" |
| << reg_list.last_register().ToString(parameter_count); |
| break; |
| } |
| case interpreter::OperandType::kRegOutPair: |
| case interpreter::OperandType::kRegPair: { |
| RegisterList reg_list = |
| DecodeRegisterListOperand(operand_start, 2, op_type, operand_scale); |
| os << reg_list.first_register().ToString(parameter_count) << "-" |
| << reg_list.last_register().ToString(parameter_count); |
| break; |
| } |
| case interpreter::OperandType::kRegOutList: |
| case interpreter::OperandType::kRegList: { |
| DCHECK_LT(i, number_of_operands - 1); |
| DCHECK_EQ(Bytecodes::GetOperandType(bytecode, i + 1), |
| OperandType::kRegCount); |
| int reg_count_offset = |
| Bytecodes::GetOperandOffset(bytecode, i + 1, operand_scale); |
| Address reg_count_operand = reinterpret_cast<Address>( |
| &bytecode_start[prefix_offset + reg_count_offset]); |
| uint32_t count = DecodeUnsignedOperand( |
| reg_count_operand, OperandType::kRegCount, operand_scale); |
| RegisterList reg_list = DecodeRegisterListOperand( |
| operand_start, count, op_type, operand_scale); |
| os << reg_list.first_register().ToString(parameter_count) << "-" |
| << reg_list.last_register().ToString(parameter_count); |
| i++; // Skip kRegCount. |
| break; |
| } |
| case interpreter::OperandType::kNone: |
| case interpreter::OperandType::kRegCount: // Dealt with in kRegList. |
| UNREACHABLE(); |
| break; |
| } |
| if (i != number_of_operands - 1) { |
| os << ", "; |
| } |
| } |
| return os; |
| } |
| |
| } // namespace interpreter |
| } // namespace internal |
| } // namespace v8 |
