Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/interpreter/bytecodes.h" |
| 6 | |
| 7 | #include "src/frames.h" |
| 8 | #include "src/interpreter/bytecode-traits.h" |
| 9 | |
| 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | namespace interpreter { |
| 13 | |
| 14 | |
| 15 | // static |
| 16 | const char* Bytecodes::ToString(Bytecode bytecode) { |
| 17 | switch (bytecode) { |
| 18 | #define CASE(Name, ...) \ |
| 19 | case Bytecode::k##Name: \ |
| 20 | return #Name; |
| 21 | BYTECODE_LIST(CASE) |
| 22 | #undef CASE |
| 23 | } |
| 24 | UNREACHABLE(); |
| 25 | return ""; |
| 26 | } |
| 27 | |
| 28 | |
| 29 | // static |
| 30 | const char* Bytecodes::OperandTypeToString(OperandType operand_type) { |
| 31 | switch (operand_type) { |
| 32 | #define CASE(Name, _) \ |
| 33 | case OperandType::k##Name: \ |
| 34 | return #Name; |
| 35 | OPERAND_TYPE_LIST(CASE) |
| 36 | #undef CASE |
| 37 | } |
| 38 | UNREACHABLE(); |
| 39 | return ""; |
| 40 | } |
| 41 | |
| 42 | |
| 43 | // static |
| 44 | const char* Bytecodes::OperandSizeToString(OperandSize operand_size) { |
| 45 | switch (operand_size) { |
| 46 | case OperandSize::kNone: |
| 47 | return "None"; |
| 48 | case OperandSize::kByte: |
| 49 | return "Byte"; |
| 50 | case OperandSize::kShort: |
| 51 | return "Short"; |
| 52 | } |
| 53 | UNREACHABLE(); |
| 54 | return ""; |
| 55 | } |
| 56 | |
| 57 | |
| 58 | // static |
| 59 | uint8_t Bytecodes::ToByte(Bytecode bytecode) { |
| 60 | return static_cast<uint8_t>(bytecode); |
| 61 | } |
| 62 | |
| 63 | |
| 64 | // static |
| 65 | Bytecode Bytecodes::FromByte(uint8_t value) { |
| 66 | Bytecode bytecode = static_cast<Bytecode>(value); |
| 67 | DCHECK(bytecode <= Bytecode::kLast); |
| 68 | return bytecode; |
| 69 | } |
| 70 | |
| 71 | |
| 72 | // static |
| 73 | int Bytecodes::Size(Bytecode bytecode) { |
| 74 | DCHECK(bytecode <= Bytecode::kLast); |
| 75 | switch (bytecode) { |
| 76 | #define CASE(Name, ...) \ |
| 77 | case Bytecode::k##Name: \ |
| 78 | return BytecodeTraits<__VA_ARGS__, OPERAND_TERM>::kSize; |
| 79 | BYTECODE_LIST(CASE) |
| 80 | #undef CASE |
| 81 | } |
| 82 | UNREACHABLE(); |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | |
| 87 | // static |
| 88 | int Bytecodes::NumberOfOperands(Bytecode bytecode) { |
| 89 | DCHECK(bytecode <= Bytecode::kLast); |
| 90 | switch (bytecode) { |
| 91 | #define CASE(Name, ...) \ |
| 92 | case Bytecode::k##Name: \ |
| 93 | return BytecodeTraits<__VA_ARGS__, OPERAND_TERM>::kOperandCount; |
| 94 | BYTECODE_LIST(CASE) |
| 95 | #undef CASE |
| 96 | } |
| 97 | UNREACHABLE(); |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | |
| 102 | // static |
| 103 | OperandType Bytecodes::GetOperandType(Bytecode bytecode, int i) { |
| 104 | DCHECK(bytecode <= Bytecode::kLast); |
| 105 | switch (bytecode) { |
| 106 | #define CASE(Name, ...) \ |
| 107 | case Bytecode::k##Name: \ |
| 108 | return BytecodeTraits<__VA_ARGS__, OPERAND_TERM>::GetOperandType(i); |
| 109 | BYTECODE_LIST(CASE) |
| 110 | #undef CASE |
| 111 | } |
| 112 | UNREACHABLE(); |
| 113 | return OperandType::kNone; |
| 114 | } |
| 115 | |
| 116 | |
| 117 | // static |
| 118 | OperandSize Bytecodes::GetOperandSize(Bytecode bytecode, int i) { |
| 119 | DCHECK(bytecode <= Bytecode::kLast); |
| 120 | switch (bytecode) { |
| 121 | #define CASE(Name, ...) \ |
| 122 | case Bytecode::k##Name: \ |
| 123 | return BytecodeTraits<__VA_ARGS__, OPERAND_TERM>::GetOperandSize(i); |
| 124 | BYTECODE_LIST(CASE) |
| 125 | #undef CASE |
| 126 | } |
| 127 | UNREACHABLE(); |
| 128 | return OperandSize::kNone; |
| 129 | } |
| 130 | |
| 131 | |
| 132 | // static |
| 133 | int Bytecodes::GetOperandOffset(Bytecode bytecode, int i) { |
| 134 | DCHECK(bytecode <= Bytecode::kLast); |
| 135 | switch (bytecode) { |
| 136 | #define CASE(Name, ...) \ |
| 137 | case Bytecode::k##Name: \ |
| 138 | return BytecodeTraits<__VA_ARGS__, OPERAND_TERM>::GetOperandOffset(i); |
| 139 | BYTECODE_LIST(CASE) |
| 140 | #undef CASE |
| 141 | } |
| 142 | UNREACHABLE(); |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | |
| 147 | // static |
| 148 | OperandSize Bytecodes::SizeOfOperand(OperandType operand_type) { |
| 149 | switch (operand_type) { |
| 150 | #define CASE(Name, Size) \ |
| 151 | case OperandType::k##Name: \ |
| 152 | return Size; |
| 153 | OPERAND_TYPE_LIST(CASE) |
| 154 | #undef CASE |
| 155 | } |
| 156 | UNREACHABLE(); |
| 157 | return OperandSize::kNone; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | // static |
| 162 | bool Bytecodes::IsConditionalJumpImmediate(Bytecode bytecode) { |
| 163 | return bytecode == Bytecode::kJumpIfTrue || |
| 164 | bytecode == Bytecode::kJumpIfFalse || |
| 165 | bytecode == Bytecode::kJumpIfToBooleanTrue || |
| 166 | bytecode == Bytecode::kJumpIfToBooleanFalse || |
| 167 | bytecode == Bytecode::kJumpIfNull || |
| 168 | bytecode == Bytecode::kJumpIfUndefined; |
| 169 | } |
| 170 | |
| 171 | |
| 172 | // static |
| 173 | bool Bytecodes::IsConditionalJumpConstant(Bytecode bytecode) { |
| 174 | return bytecode == Bytecode::kJumpIfTrueConstant || |
| 175 | bytecode == Bytecode::kJumpIfFalseConstant || |
| 176 | bytecode == Bytecode::kJumpIfToBooleanTrueConstant || |
| 177 | bytecode == Bytecode::kJumpIfToBooleanFalseConstant || |
| 178 | bytecode == Bytecode::kJumpIfNullConstant || |
| 179 | bytecode == Bytecode::kJumpIfUndefinedConstant; |
| 180 | } |
| 181 | |
| 182 | |
| 183 | // static |
| 184 | bool Bytecodes::IsConditionalJumpConstantWide(Bytecode bytecode) { |
| 185 | return bytecode == Bytecode::kJumpIfTrueConstantWide || |
| 186 | bytecode == Bytecode::kJumpIfFalseConstantWide || |
| 187 | bytecode == Bytecode::kJumpIfToBooleanTrueConstantWide || |
| 188 | bytecode == Bytecode::kJumpIfToBooleanFalseConstantWide || |
| 189 | bytecode == Bytecode::kJumpIfNullConstantWide || |
| 190 | bytecode == Bytecode::kJumpIfUndefinedConstantWide; |
| 191 | } |
| 192 | |
| 193 | |
| 194 | // static |
| 195 | bool Bytecodes::IsConditionalJump(Bytecode bytecode) { |
| 196 | return IsConditionalJumpImmediate(bytecode) || |
| 197 | IsConditionalJumpConstant(bytecode) || |
| 198 | IsConditionalJumpConstantWide(bytecode); |
| 199 | } |
| 200 | |
| 201 | |
| 202 | // static |
| 203 | bool Bytecodes::IsJumpImmediate(Bytecode bytecode) { |
| 204 | return bytecode == Bytecode::kJump || IsConditionalJumpImmediate(bytecode); |
| 205 | } |
| 206 | |
| 207 | |
| 208 | // static |
| 209 | bool Bytecodes::IsJumpConstant(Bytecode bytecode) { |
| 210 | return bytecode == Bytecode::kJumpConstant || |
| 211 | IsConditionalJumpConstant(bytecode); |
| 212 | } |
| 213 | |
| 214 | |
| 215 | // static |
| 216 | bool Bytecodes::IsJumpConstantWide(Bytecode bytecode) { |
| 217 | return bytecode == Bytecode::kJumpConstantWide || |
| 218 | IsConditionalJumpConstantWide(bytecode); |
| 219 | } |
| 220 | |
| 221 | |
| 222 | // static |
| 223 | bool Bytecodes::IsJump(Bytecode bytecode) { |
| 224 | return IsJumpImmediate(bytecode) || IsJumpConstant(bytecode) || |
| 225 | IsJumpConstantWide(bytecode); |
| 226 | } |
| 227 | |
| 228 | |
| 229 | // static |
| 230 | bool Bytecodes::IsJumpOrReturn(Bytecode bytecode) { |
| 231 | return bytecode == Bytecode::kReturn || IsJump(bytecode); |
| 232 | } |
| 233 | |
| 234 | |
| 235 | // static |
| 236 | std::ostream& Bytecodes::Decode(std::ostream& os, const uint8_t* bytecode_start, |
| 237 | int parameter_count) { |
| 238 | Vector<char> buf = Vector<char>::New(50); |
| 239 | |
| 240 | Bytecode bytecode = Bytecodes::FromByte(bytecode_start[0]); |
| 241 | int bytecode_size = Bytecodes::Size(bytecode); |
| 242 | |
| 243 | for (int i = 0; i < bytecode_size; i++) { |
| 244 | SNPrintF(buf, "%02x ", bytecode_start[i]); |
| 245 | os << buf.start(); |
| 246 | } |
| 247 | const int kBytecodeColumnSize = 6; |
| 248 | for (int i = bytecode_size; i < kBytecodeColumnSize; i++) { |
| 249 | os << " "; |
| 250 | } |
| 251 | |
| 252 | os << bytecode << " "; |
| 253 | |
| 254 | int number_of_operands = NumberOfOperands(bytecode); |
| 255 | for (int i = 0; i < number_of_operands; i++) { |
| 256 | OperandType op_type = GetOperandType(bytecode, i); |
| 257 | const uint8_t* operand_start = |
| 258 | &bytecode_start[GetOperandOffset(bytecode, i)]; |
| 259 | switch (op_type) { |
| 260 | case interpreter::OperandType::kCount8: |
| 261 | os << "#" << static_cast<unsigned int>(*operand_start); |
| 262 | break; |
| 263 | case interpreter::OperandType::kCount16: |
| 264 | os << '#' << ReadUnalignedUInt16(operand_start); |
| 265 | break; |
| 266 | case interpreter::OperandType::kIdx8: |
| 267 | os << "[" << static_cast<unsigned int>(*operand_start) << "]"; |
| 268 | break; |
| 269 | case interpreter::OperandType::kIdx16: |
| 270 | os << "[" << ReadUnalignedUInt16(operand_start) << "]"; |
| 271 | break; |
| 272 | case interpreter::OperandType::kImm8: |
| 273 | os << "#" << static_cast<int>(static_cast<int8_t>(*operand_start)); |
| 274 | break; |
| 275 | case interpreter::OperandType::kReg8: |
| 276 | case interpreter::OperandType::kMaybeReg8: { |
| 277 | Register reg = Register::FromOperand(*operand_start); |
| 278 | if (reg.is_function_context()) { |
| 279 | os << "<context>"; |
| 280 | } else if (reg.is_function_closure()) { |
| 281 | os << "<closure>"; |
| 282 | } else if (reg.is_new_target()) { |
| 283 | os << "<new.target>"; |
| 284 | } else if (reg.is_parameter()) { |
| 285 | int parameter_index = reg.ToParameterIndex(parameter_count); |
| 286 | if (parameter_index == 0) { |
| 287 | os << "<this>"; |
| 288 | } else { |
| 289 | os << "a" << parameter_index - 1; |
| 290 | } |
| 291 | } else { |
| 292 | os << "r" << reg.index(); |
| 293 | } |
| 294 | break; |
| 295 | } |
| 296 | case interpreter::OperandType::kRegPair8: { |
| 297 | Register reg = Register::FromOperand(*operand_start); |
| 298 | if (reg.is_parameter()) { |
| 299 | int parameter_index = reg.ToParameterIndex(parameter_count); |
| 300 | DCHECK_NE(parameter_index, 0); |
| 301 | os << "a" << parameter_index - 1 << "-" << parameter_index; |
| 302 | } else { |
| 303 | os << "r" << reg.index() << "-" << reg.index() + 1; |
| 304 | } |
| 305 | break; |
| 306 | } |
| 307 | case interpreter::OperandType::kReg16: { |
| 308 | Register reg = |
| 309 | Register::FromWideOperand(ReadUnalignedUInt16(operand_start)); |
| 310 | if (reg.is_parameter()) { |
| 311 | int parameter_index = reg.ToParameterIndex(parameter_count); |
| 312 | DCHECK_NE(parameter_index, 0); |
| 313 | os << "a" << parameter_index - 1; |
| 314 | } else { |
| 315 | os << "r" << reg.index(); |
| 316 | } |
| 317 | break; |
| 318 | } |
| 319 | case interpreter::OperandType::kNone: |
| 320 | UNREACHABLE(); |
| 321 | break; |
| 322 | } |
| 323 | if (i != number_of_operands - 1) { |
| 324 | os << ", "; |
| 325 | } |
| 326 | } |
| 327 | return os; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode) { |
| 332 | return os << Bytecodes::ToString(bytecode); |
| 333 | } |
| 334 | |
| 335 | |
| 336 | std::ostream& operator<<(std::ostream& os, const OperandType& operand_type) { |
| 337 | return os << Bytecodes::OperandTypeToString(operand_type); |
| 338 | } |
| 339 | |
| 340 | |
| 341 | std::ostream& operator<<(std::ostream& os, const OperandSize& operand_size) { |
| 342 | return os << Bytecodes::OperandSizeToString(operand_size); |
| 343 | } |
| 344 | |
| 345 | |
| 346 | static const int kLastParamRegisterIndex = |
| 347 | -InterpreterFrameConstants::kLastParamFromRegisterPointer / kPointerSize; |
| 348 | static const int kFunctionClosureRegisterIndex = |
| 349 | -InterpreterFrameConstants::kFunctionFromRegisterPointer / kPointerSize; |
| 350 | static const int kFunctionContextRegisterIndex = |
| 351 | -InterpreterFrameConstants::kContextFromRegisterPointer / kPointerSize; |
| 352 | static const int kNewTargetRegisterIndex = |
| 353 | -InterpreterFrameConstants::kNewTargetFromRegisterPointer / kPointerSize; |
| 354 | |
| 355 | |
| 356 | // Registers occupy range 0-127 in 8-bit value leaving 128 unused values. |
| 357 | // Parameter indices are biased with the negative value kLastParamRegisterIndex |
| 358 | // for ease of access in the interpreter. |
| 359 | static const int kMaxParameterIndex = 128 + kLastParamRegisterIndex; |
| 360 | |
| 361 | |
| 362 | Register Register::FromParameterIndex(int index, int parameter_count) { |
| 363 | DCHECK_GE(index, 0); |
| 364 | DCHECK_LT(index, parameter_count); |
| 365 | DCHECK_LE(parameter_count, kMaxParameterIndex + 1); |
| 366 | int register_index = kLastParamRegisterIndex - parameter_count + index + 1; |
| 367 | DCHECK_LT(register_index, 0); |
| 368 | DCHECK_GE(register_index, kMinInt8); |
| 369 | return Register(register_index); |
| 370 | } |
| 371 | |
| 372 | |
| 373 | int Register::ToParameterIndex(int parameter_count) const { |
| 374 | DCHECK(is_parameter()); |
| 375 | return index() - kLastParamRegisterIndex + parameter_count - 1; |
| 376 | } |
| 377 | |
| 378 | |
| 379 | Register Register::function_closure() { |
| 380 | return Register(kFunctionClosureRegisterIndex); |
| 381 | } |
| 382 | |
| 383 | |
| 384 | bool Register::is_function_closure() const { |
| 385 | return index() == kFunctionClosureRegisterIndex; |
| 386 | } |
| 387 | |
| 388 | |
| 389 | Register Register::function_context() { |
| 390 | return Register(kFunctionContextRegisterIndex); |
| 391 | } |
| 392 | |
| 393 | |
| 394 | bool Register::is_function_context() const { |
| 395 | return index() == kFunctionContextRegisterIndex; |
| 396 | } |
| 397 | |
| 398 | |
| 399 | Register Register::new_target() { return Register(kNewTargetRegisterIndex); } |
| 400 | |
| 401 | |
| 402 | bool Register::is_new_target() const { |
| 403 | return index() == kNewTargetRegisterIndex; |
| 404 | } |
| 405 | |
| 406 | |
| 407 | int Register::MaxParameterIndex() { return kMaxParameterIndex; } |
| 408 | |
| 409 | |
| 410 | uint8_t Register::ToOperand() const { |
| 411 | DCHECK_GE(index_, kMinInt8); |
| 412 | DCHECK_LE(index_, kMaxInt8); |
| 413 | return static_cast<uint8_t>(-index_); |
| 414 | } |
| 415 | |
| 416 | |
| 417 | Register Register::FromOperand(uint8_t operand) { |
| 418 | return Register(-static_cast<int8_t>(operand)); |
| 419 | } |
| 420 | |
| 421 | |
| 422 | uint16_t Register::ToWideOperand() const { |
| 423 | DCHECK_GE(index_, kMinInt16); |
| 424 | DCHECK_LE(index_, kMaxInt16); |
| 425 | return static_cast<uint16_t>(-index_); |
| 426 | } |
| 427 | |
| 428 | |
| 429 | Register Register::FromWideOperand(uint16_t operand) { |
| 430 | return Register(-static_cast<int16_t>(operand)); |
| 431 | } |
| 432 | |
| 433 | |
| 434 | bool Register::AreContiguous(Register reg1, Register reg2, Register reg3, |
| 435 | Register reg4, Register reg5) { |
| 436 | if (reg1.index() + 1 != reg2.index()) { |
| 437 | return false; |
| 438 | } |
| 439 | if (reg3.is_valid() && reg2.index() + 1 != reg3.index()) { |
| 440 | return false; |
| 441 | } |
| 442 | if (reg4.is_valid() && reg3.index() + 1 != reg4.index()) { |
| 443 | return false; |
| 444 | } |
| 445 | if (reg5.is_valid() && reg4.index() + 1 != reg5.index()) { |
| 446 | return false; |
| 447 | } |
| 448 | return true; |
| 449 | } |
| 450 | |
| 451 | } // namespace interpreter |
| 452 | } // namespace internal |
| 453 | } // namespace v8 |