Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2013 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 | #ifndef V8_ARM64_ASSEMBLER_ARM64_H_ |
| 6 | #define V8_ARM64_ASSEMBLER_ARM64_H_ |
| 7 | |
| 8 | #include <list> |
| 9 | #include <map> |
| 10 | #include <vector> |
| 11 | |
| 12 | #include "src/arm64/instructions-arm64.h" |
| 13 | #include "src/assembler.h" |
| 14 | #include "src/globals.h" |
| 15 | #include "src/serialize.h" |
| 16 | #include "src/utils.h" |
| 17 | |
| 18 | |
| 19 | namespace v8 { |
| 20 | namespace internal { |
| 21 | |
| 22 | |
| 23 | // ----------------------------------------------------------------------------- |
| 24 | // Registers. |
| 25 | #define REGISTER_CODE_LIST(R) \ |
| 26 | R(0) R(1) R(2) R(3) R(4) R(5) R(6) R(7) \ |
| 27 | R(8) R(9) R(10) R(11) R(12) R(13) R(14) R(15) \ |
| 28 | R(16) R(17) R(18) R(19) R(20) R(21) R(22) R(23) \ |
| 29 | R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31) |
| 30 | |
| 31 | |
| 32 | static const int kRegListSizeInBits = sizeof(RegList) * kBitsPerByte; |
| 33 | |
| 34 | |
| 35 | // Some CPURegister methods can return Register and FPRegister types, so we |
| 36 | // need to declare them in advance. |
| 37 | struct Register; |
| 38 | struct FPRegister; |
| 39 | |
| 40 | |
| 41 | struct CPURegister { |
| 42 | enum RegisterType { |
| 43 | // The kInvalid value is used to detect uninitialized static instances, |
| 44 | // which are always zero-initialized before any constructors are called. |
| 45 | kInvalid = 0, |
| 46 | kRegister, |
| 47 | kFPRegister, |
| 48 | kNoRegister |
| 49 | }; |
| 50 | |
| 51 | static CPURegister Create(unsigned code, unsigned size, RegisterType type) { |
| 52 | CPURegister r = {code, size, type}; |
| 53 | return r; |
| 54 | } |
| 55 | |
| 56 | unsigned code() const; |
| 57 | RegisterType type() const; |
| 58 | RegList Bit() const; |
| 59 | unsigned SizeInBits() const; |
| 60 | int SizeInBytes() const; |
| 61 | bool Is32Bits() const; |
| 62 | bool Is64Bits() const; |
| 63 | bool IsValid() const; |
| 64 | bool IsValidOrNone() const; |
| 65 | bool IsValidRegister() const; |
| 66 | bool IsValidFPRegister() const; |
| 67 | bool IsNone() const; |
| 68 | bool Is(const CPURegister& other) const; |
| 69 | bool Aliases(const CPURegister& other) const; |
| 70 | |
| 71 | bool IsZero() const; |
| 72 | bool IsSP() const; |
| 73 | |
| 74 | bool IsRegister() const; |
| 75 | bool IsFPRegister() const; |
| 76 | |
| 77 | Register X() const; |
| 78 | Register W() const; |
| 79 | FPRegister D() const; |
| 80 | FPRegister S() const; |
| 81 | |
| 82 | bool IsSameSizeAndType(const CPURegister& other) const; |
| 83 | |
| 84 | // V8 compatibility. |
| 85 | bool is(const CPURegister& other) const { return Is(other); } |
| 86 | bool is_valid() const { return IsValid(); } |
| 87 | |
| 88 | unsigned reg_code; |
| 89 | unsigned reg_size; |
| 90 | RegisterType reg_type; |
| 91 | }; |
| 92 | |
| 93 | |
| 94 | struct Register : public CPURegister { |
| 95 | static Register Create(unsigned code, unsigned size) { |
| 96 | return Register(CPURegister::Create(code, size, CPURegister::kRegister)); |
| 97 | } |
| 98 | |
| 99 | Register() { |
| 100 | reg_code = 0; |
| 101 | reg_size = 0; |
| 102 | reg_type = CPURegister::kNoRegister; |
| 103 | } |
| 104 | |
| 105 | explicit Register(const CPURegister& r) { |
| 106 | reg_code = r.reg_code; |
| 107 | reg_size = r.reg_size; |
| 108 | reg_type = r.reg_type; |
| 109 | DCHECK(IsValidOrNone()); |
| 110 | } |
| 111 | |
| 112 | Register(const Register& r) { // NOLINT(runtime/explicit) |
| 113 | reg_code = r.reg_code; |
| 114 | reg_size = r.reg_size; |
| 115 | reg_type = r.reg_type; |
| 116 | DCHECK(IsValidOrNone()); |
| 117 | } |
| 118 | |
| 119 | bool IsValid() const { |
| 120 | DCHECK(IsRegister() || IsNone()); |
| 121 | return IsValidRegister(); |
| 122 | } |
| 123 | |
| 124 | static Register XRegFromCode(unsigned code); |
| 125 | static Register WRegFromCode(unsigned code); |
| 126 | |
| 127 | // Start of V8 compatibility section --------------------- |
| 128 | // These memebers are necessary for compilation. |
| 129 | // A few of them may be unused for now. |
| 130 | |
| 131 | static const int kNumRegisters = kNumberOfRegisters; |
| 132 | static int NumRegisters() { return kNumRegisters; } |
| 133 | |
| 134 | // We allow crankshaft to use the following registers: |
| 135 | // - x0 to x15 |
| 136 | // - x18 to x24 |
| 137 | // - x27 (also context) |
| 138 | // |
| 139 | // TODO(all): Register x25 is currently free and could be available for |
| 140 | // crankshaft, but we don't use it as we might use it as a per function |
| 141 | // literal pool pointer in the future. |
| 142 | // |
| 143 | // TODO(all): Consider storing cp in x25 to have only two ranges. |
| 144 | // We split allocatable registers in three ranges called |
| 145 | // - "low range" |
| 146 | // - "high range" |
| 147 | // - "context" |
| 148 | static const unsigned kAllocatableLowRangeBegin = 0; |
| 149 | static const unsigned kAllocatableLowRangeEnd = 15; |
| 150 | static const unsigned kAllocatableHighRangeBegin = 18; |
| 151 | static const unsigned kAllocatableHighRangeEnd = 24; |
| 152 | static const unsigned kAllocatableContext = 27; |
| 153 | |
| 154 | // Gap between low and high ranges. |
| 155 | static const int kAllocatableRangeGapSize = |
| 156 | (kAllocatableHighRangeBegin - kAllocatableLowRangeEnd) - 1; |
| 157 | |
| 158 | static const int kMaxNumAllocatableRegisters = |
| 159 | (kAllocatableLowRangeEnd - kAllocatableLowRangeBegin + 1) + |
| 160 | (kAllocatableHighRangeEnd - kAllocatableHighRangeBegin + 1) + 1; // cp |
| 161 | static int NumAllocatableRegisters() { return kMaxNumAllocatableRegisters; } |
| 162 | |
| 163 | // Return true if the register is one that crankshaft can allocate. |
| 164 | bool IsAllocatable() const { |
| 165 | return ((reg_code == kAllocatableContext) || |
| 166 | (reg_code <= kAllocatableLowRangeEnd) || |
| 167 | ((reg_code >= kAllocatableHighRangeBegin) && |
| 168 | (reg_code <= kAllocatableHighRangeEnd))); |
| 169 | } |
| 170 | |
| 171 | static Register FromAllocationIndex(unsigned index) { |
| 172 | DCHECK(index < static_cast<unsigned>(NumAllocatableRegisters())); |
| 173 | // cp is the last allocatable register. |
| 174 | if (index == (static_cast<unsigned>(NumAllocatableRegisters() - 1))) { |
| 175 | return from_code(kAllocatableContext); |
| 176 | } |
| 177 | |
| 178 | // Handle low and high ranges. |
| 179 | return (index <= kAllocatableLowRangeEnd) |
| 180 | ? from_code(index) |
| 181 | : from_code(index + kAllocatableRangeGapSize); |
| 182 | } |
| 183 | |
| 184 | static const char* AllocationIndexToString(int index) { |
| 185 | DCHECK((index >= 0) && (index < NumAllocatableRegisters())); |
| 186 | DCHECK((kAllocatableLowRangeBegin == 0) && |
| 187 | (kAllocatableLowRangeEnd == 15) && |
| 188 | (kAllocatableHighRangeBegin == 18) && |
| 189 | (kAllocatableHighRangeEnd == 24) && |
| 190 | (kAllocatableContext == 27)); |
| 191 | const char* const names[] = { |
| 192 | "x0", "x1", "x2", "x3", "x4", |
| 193 | "x5", "x6", "x7", "x8", "x9", |
| 194 | "x10", "x11", "x12", "x13", "x14", |
| 195 | "x15", "x18", "x19", "x20", "x21", |
| 196 | "x22", "x23", "x24", "x27", |
| 197 | }; |
| 198 | return names[index]; |
| 199 | } |
| 200 | |
| 201 | static int ToAllocationIndex(Register reg) { |
| 202 | DCHECK(reg.IsAllocatable()); |
| 203 | unsigned code = reg.code(); |
| 204 | if (code == kAllocatableContext) { |
| 205 | return NumAllocatableRegisters() - 1; |
| 206 | } |
| 207 | |
| 208 | return (code <= kAllocatableLowRangeEnd) |
| 209 | ? code |
| 210 | : code - kAllocatableRangeGapSize; |
| 211 | } |
| 212 | |
| 213 | static Register from_code(int code) { |
| 214 | // Always return an X register. |
| 215 | return Register::Create(code, kXRegSizeInBits); |
| 216 | } |
| 217 | |
| 218 | // End of V8 compatibility section ----------------------- |
| 219 | }; |
| 220 | |
| 221 | |
| 222 | struct FPRegister : public CPURegister { |
| 223 | static FPRegister Create(unsigned code, unsigned size) { |
| 224 | return FPRegister( |
| 225 | CPURegister::Create(code, size, CPURegister::kFPRegister)); |
| 226 | } |
| 227 | |
| 228 | FPRegister() { |
| 229 | reg_code = 0; |
| 230 | reg_size = 0; |
| 231 | reg_type = CPURegister::kNoRegister; |
| 232 | } |
| 233 | |
| 234 | explicit FPRegister(const CPURegister& r) { |
| 235 | reg_code = r.reg_code; |
| 236 | reg_size = r.reg_size; |
| 237 | reg_type = r.reg_type; |
| 238 | DCHECK(IsValidOrNone()); |
| 239 | } |
| 240 | |
| 241 | FPRegister(const FPRegister& r) { // NOLINT(runtime/explicit) |
| 242 | reg_code = r.reg_code; |
| 243 | reg_size = r.reg_size; |
| 244 | reg_type = r.reg_type; |
| 245 | DCHECK(IsValidOrNone()); |
| 246 | } |
| 247 | |
| 248 | bool IsValid() const { |
| 249 | DCHECK(IsFPRegister() || IsNone()); |
| 250 | return IsValidFPRegister(); |
| 251 | } |
| 252 | |
| 253 | static FPRegister SRegFromCode(unsigned code); |
| 254 | static FPRegister DRegFromCode(unsigned code); |
| 255 | |
| 256 | // Start of V8 compatibility section --------------------- |
| 257 | static const int kMaxNumRegisters = kNumberOfFPRegisters; |
| 258 | |
| 259 | // Crankshaft can use all the FP registers except: |
| 260 | // - d15 which is used to keep the 0 double value |
| 261 | // - d30 which is used in crankshaft as a double scratch register |
| 262 | // - d31 which is used in the MacroAssembler as a double scratch register |
| 263 | static const unsigned kAllocatableLowRangeBegin = 0; |
| 264 | static const unsigned kAllocatableLowRangeEnd = 14; |
| 265 | static const unsigned kAllocatableHighRangeBegin = 16; |
| 266 | static const unsigned kAllocatableHighRangeEnd = 28; |
| 267 | |
| 268 | static const RegList kAllocatableFPRegisters = 0x1fff7fff; |
| 269 | |
| 270 | // Gap between low and high ranges. |
| 271 | static const int kAllocatableRangeGapSize = |
| 272 | (kAllocatableHighRangeBegin - kAllocatableLowRangeEnd) - 1; |
| 273 | |
| 274 | static const int kMaxNumAllocatableRegisters = |
| 275 | (kAllocatableLowRangeEnd - kAllocatableLowRangeBegin + 1) + |
| 276 | (kAllocatableHighRangeEnd - kAllocatableHighRangeBegin + 1); |
| 277 | static int NumAllocatableRegisters() { return kMaxNumAllocatableRegisters; } |
| 278 | |
| 279 | // Return true if the register is one that crankshaft can allocate. |
| 280 | bool IsAllocatable() const { |
| 281 | return (Bit() & kAllocatableFPRegisters) != 0; |
| 282 | } |
| 283 | |
| 284 | static FPRegister FromAllocationIndex(unsigned int index) { |
| 285 | DCHECK(index < static_cast<unsigned>(NumAllocatableRegisters())); |
| 286 | |
| 287 | return (index <= kAllocatableLowRangeEnd) |
| 288 | ? from_code(index) |
| 289 | : from_code(index + kAllocatableRangeGapSize); |
| 290 | } |
| 291 | |
| 292 | static const char* AllocationIndexToString(int index) { |
| 293 | DCHECK((index >= 0) && (index < NumAllocatableRegisters())); |
| 294 | DCHECK((kAllocatableLowRangeBegin == 0) && |
| 295 | (kAllocatableLowRangeEnd == 14) && |
| 296 | (kAllocatableHighRangeBegin == 16) && |
| 297 | (kAllocatableHighRangeEnd == 28)); |
| 298 | const char* const names[] = { |
| 299 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
| 300 | "d8", "d9", "d10", "d11", "d12", "d13", "d14", |
| 301 | "d16", "d17", "d18", "d19", "d20", "d21", "d22", "d23", |
| 302 | "d24", "d25", "d26", "d27", "d28" |
| 303 | }; |
| 304 | return names[index]; |
| 305 | } |
| 306 | |
| 307 | static int ToAllocationIndex(FPRegister reg) { |
| 308 | DCHECK(reg.IsAllocatable()); |
| 309 | unsigned code = reg.code(); |
| 310 | |
| 311 | return (code <= kAllocatableLowRangeEnd) |
| 312 | ? code |
| 313 | : code - kAllocatableRangeGapSize; |
| 314 | } |
| 315 | |
| 316 | static FPRegister from_code(int code) { |
| 317 | // Always return a D register. |
| 318 | return FPRegister::Create(code, kDRegSizeInBits); |
| 319 | } |
| 320 | // End of V8 compatibility section ----------------------- |
| 321 | }; |
| 322 | |
| 323 | |
| 324 | STATIC_ASSERT(sizeof(CPURegister) == sizeof(Register)); |
| 325 | STATIC_ASSERT(sizeof(CPURegister) == sizeof(FPRegister)); |
| 326 | |
| 327 | |
| 328 | #if defined(ARM64_DEFINE_REG_STATICS) |
| 329 | #define INITIALIZE_REGISTER(register_class, name, code, size, type) \ |
| 330 | const CPURegister init_##register_class##_##name = {code, size, type}; \ |
| 331 | const register_class& name = *reinterpret_cast<const register_class*>( \ |
| 332 | &init_##register_class##_##name) |
| 333 | #define ALIAS_REGISTER(register_class, alias, name) \ |
| 334 | const register_class& alias = *reinterpret_cast<const register_class*>( \ |
| 335 | &init_##register_class##_##name) |
| 336 | #else |
| 337 | #define INITIALIZE_REGISTER(register_class, name, code, size, type) \ |
| 338 | extern const register_class& name |
| 339 | #define ALIAS_REGISTER(register_class, alias, name) \ |
| 340 | extern const register_class& alias |
| 341 | #endif // defined(ARM64_DEFINE_REG_STATICS) |
| 342 | |
| 343 | // No*Reg is used to indicate an unused argument, or an error case. Note that |
| 344 | // these all compare equal (using the Is() method). The Register and FPRegister |
| 345 | // variants are provided for convenience. |
| 346 | INITIALIZE_REGISTER(Register, NoReg, 0, 0, CPURegister::kNoRegister); |
| 347 | INITIALIZE_REGISTER(FPRegister, NoFPReg, 0, 0, CPURegister::kNoRegister); |
| 348 | INITIALIZE_REGISTER(CPURegister, NoCPUReg, 0, 0, CPURegister::kNoRegister); |
| 349 | |
| 350 | // v8 compatibility. |
| 351 | INITIALIZE_REGISTER(Register, no_reg, 0, 0, CPURegister::kNoRegister); |
| 352 | |
| 353 | #define DEFINE_REGISTERS(N) \ |
| 354 | INITIALIZE_REGISTER(Register, w##N, N, \ |
| 355 | kWRegSizeInBits, CPURegister::kRegister); \ |
| 356 | INITIALIZE_REGISTER(Register, x##N, N, \ |
| 357 | kXRegSizeInBits, CPURegister::kRegister); |
| 358 | REGISTER_CODE_LIST(DEFINE_REGISTERS) |
| 359 | #undef DEFINE_REGISTERS |
| 360 | |
| 361 | INITIALIZE_REGISTER(Register, wcsp, kSPRegInternalCode, kWRegSizeInBits, |
| 362 | CPURegister::kRegister); |
| 363 | INITIALIZE_REGISTER(Register, csp, kSPRegInternalCode, kXRegSizeInBits, |
| 364 | CPURegister::kRegister); |
| 365 | |
| 366 | #define DEFINE_FPREGISTERS(N) \ |
| 367 | INITIALIZE_REGISTER(FPRegister, s##N, N, \ |
| 368 | kSRegSizeInBits, CPURegister::kFPRegister); \ |
| 369 | INITIALIZE_REGISTER(FPRegister, d##N, N, \ |
| 370 | kDRegSizeInBits, CPURegister::kFPRegister); |
| 371 | REGISTER_CODE_LIST(DEFINE_FPREGISTERS) |
| 372 | #undef DEFINE_FPREGISTERS |
| 373 | |
| 374 | #undef INITIALIZE_REGISTER |
| 375 | |
| 376 | // Registers aliases. |
| 377 | ALIAS_REGISTER(Register, ip0, x16); |
| 378 | ALIAS_REGISTER(Register, ip1, x17); |
| 379 | ALIAS_REGISTER(Register, wip0, w16); |
| 380 | ALIAS_REGISTER(Register, wip1, w17); |
| 381 | // Root register. |
| 382 | ALIAS_REGISTER(Register, root, x26); |
| 383 | ALIAS_REGISTER(Register, rr, x26); |
| 384 | // Context pointer register. |
| 385 | ALIAS_REGISTER(Register, cp, x27); |
| 386 | // We use a register as a JS stack pointer to overcome the restriction on the |
| 387 | // architectural SP alignment. |
| 388 | // We chose x28 because it is contiguous with the other specific purpose |
| 389 | // registers. |
| 390 | STATIC_ASSERT(kJSSPCode == 28); |
| 391 | ALIAS_REGISTER(Register, jssp, x28); |
| 392 | ALIAS_REGISTER(Register, wjssp, w28); |
| 393 | ALIAS_REGISTER(Register, fp, x29); |
| 394 | ALIAS_REGISTER(Register, lr, x30); |
| 395 | ALIAS_REGISTER(Register, xzr, x31); |
| 396 | ALIAS_REGISTER(Register, wzr, w31); |
| 397 | |
| 398 | // Keeps the 0 double value. |
| 399 | ALIAS_REGISTER(FPRegister, fp_zero, d15); |
| 400 | // Crankshaft double scratch register. |
| 401 | ALIAS_REGISTER(FPRegister, crankshaft_fp_scratch, d29); |
| 402 | // MacroAssembler double scratch registers. |
| 403 | ALIAS_REGISTER(FPRegister, fp_scratch, d30); |
| 404 | ALIAS_REGISTER(FPRegister, fp_scratch1, d30); |
| 405 | ALIAS_REGISTER(FPRegister, fp_scratch2, d31); |
| 406 | |
| 407 | #undef ALIAS_REGISTER |
| 408 | |
| 409 | |
| 410 | Register GetAllocatableRegisterThatIsNotOneOf(Register reg1, |
| 411 | Register reg2 = NoReg, |
| 412 | Register reg3 = NoReg, |
| 413 | Register reg4 = NoReg); |
| 414 | |
| 415 | |
| 416 | // AreAliased returns true if any of the named registers overlap. Arguments set |
| 417 | // to NoReg are ignored. The system stack pointer may be specified. |
| 418 | bool AreAliased(const CPURegister& reg1, |
| 419 | const CPURegister& reg2, |
| 420 | const CPURegister& reg3 = NoReg, |
| 421 | const CPURegister& reg4 = NoReg, |
| 422 | const CPURegister& reg5 = NoReg, |
| 423 | const CPURegister& reg6 = NoReg, |
| 424 | const CPURegister& reg7 = NoReg, |
| 425 | const CPURegister& reg8 = NoReg); |
| 426 | |
| 427 | // AreSameSizeAndType returns true if all of the specified registers have the |
| 428 | // same size, and are of the same type. The system stack pointer may be |
| 429 | // specified. Arguments set to NoReg are ignored, as are any subsequent |
| 430 | // arguments. At least one argument (reg1) must be valid (not NoCPUReg). |
| 431 | bool AreSameSizeAndType(const CPURegister& reg1, |
| 432 | const CPURegister& reg2, |
| 433 | const CPURegister& reg3 = NoCPUReg, |
| 434 | const CPURegister& reg4 = NoCPUReg, |
| 435 | const CPURegister& reg5 = NoCPUReg, |
| 436 | const CPURegister& reg6 = NoCPUReg, |
| 437 | const CPURegister& reg7 = NoCPUReg, |
| 438 | const CPURegister& reg8 = NoCPUReg); |
| 439 | |
| 440 | |
| 441 | typedef FPRegister DoubleRegister; |
| 442 | |
| 443 | |
| 444 | // ----------------------------------------------------------------------------- |
| 445 | // Lists of registers. |
| 446 | class CPURegList { |
| 447 | public: |
| 448 | explicit CPURegList(CPURegister reg1, |
| 449 | CPURegister reg2 = NoCPUReg, |
| 450 | CPURegister reg3 = NoCPUReg, |
| 451 | CPURegister reg4 = NoCPUReg) |
| 452 | : list_(reg1.Bit() | reg2.Bit() | reg3.Bit() | reg4.Bit()), |
| 453 | size_(reg1.SizeInBits()), type_(reg1.type()) { |
| 454 | DCHECK(AreSameSizeAndType(reg1, reg2, reg3, reg4)); |
| 455 | DCHECK(IsValid()); |
| 456 | } |
| 457 | |
| 458 | CPURegList(CPURegister::RegisterType type, unsigned size, RegList list) |
| 459 | : list_(list), size_(size), type_(type) { |
| 460 | DCHECK(IsValid()); |
| 461 | } |
| 462 | |
| 463 | CPURegList(CPURegister::RegisterType type, unsigned size, |
| 464 | unsigned first_reg, unsigned last_reg) |
| 465 | : size_(size), type_(type) { |
| 466 | DCHECK(((type == CPURegister::kRegister) && |
| 467 | (last_reg < kNumberOfRegisters)) || |
| 468 | ((type == CPURegister::kFPRegister) && |
| 469 | (last_reg < kNumberOfFPRegisters))); |
| 470 | DCHECK(last_reg >= first_reg); |
| 471 | list_ = (1UL << (last_reg + 1)) - 1; |
| 472 | list_ &= ~((1UL << first_reg) - 1); |
| 473 | DCHECK(IsValid()); |
| 474 | } |
| 475 | |
| 476 | CPURegister::RegisterType type() const { |
| 477 | DCHECK(IsValid()); |
| 478 | return type_; |
| 479 | } |
| 480 | |
| 481 | RegList list() const { |
| 482 | DCHECK(IsValid()); |
| 483 | return list_; |
| 484 | } |
| 485 | |
| 486 | inline void set_list(RegList new_list) { |
| 487 | DCHECK(IsValid()); |
| 488 | list_ = new_list; |
| 489 | } |
| 490 | |
| 491 | // Combine another CPURegList into this one. Registers that already exist in |
| 492 | // this list are left unchanged. The type and size of the registers in the |
| 493 | // 'other' list must match those in this list. |
| 494 | void Combine(const CPURegList& other); |
| 495 | |
| 496 | // Remove every register in the other CPURegList from this one. Registers that |
| 497 | // do not exist in this list are ignored. The type of the registers in the |
| 498 | // 'other' list must match those in this list. |
| 499 | void Remove(const CPURegList& other); |
| 500 | |
| 501 | // Variants of Combine and Remove which take CPURegisters. |
| 502 | void Combine(const CPURegister& other); |
| 503 | void Remove(const CPURegister& other1, |
| 504 | const CPURegister& other2 = NoCPUReg, |
| 505 | const CPURegister& other3 = NoCPUReg, |
| 506 | const CPURegister& other4 = NoCPUReg); |
| 507 | |
| 508 | // Variants of Combine and Remove which take a single register by its code; |
| 509 | // the type and size of the register is inferred from this list. |
| 510 | void Combine(int code); |
| 511 | void Remove(int code); |
| 512 | |
| 513 | // Remove all callee-saved registers from the list. This can be useful when |
| 514 | // preparing registers for an AAPCS64 function call, for example. |
| 515 | void RemoveCalleeSaved(); |
| 516 | |
| 517 | CPURegister PopLowestIndex(); |
| 518 | CPURegister PopHighestIndex(); |
| 519 | |
| 520 | // AAPCS64 callee-saved registers. |
| 521 | static CPURegList GetCalleeSaved(unsigned size = kXRegSizeInBits); |
| 522 | static CPURegList GetCalleeSavedFP(unsigned size = kDRegSizeInBits); |
| 523 | |
| 524 | // AAPCS64 caller-saved registers. Note that this includes lr. |
| 525 | static CPURegList GetCallerSaved(unsigned size = kXRegSizeInBits); |
| 526 | static CPURegList GetCallerSavedFP(unsigned size = kDRegSizeInBits); |
| 527 | |
| 528 | // Registers saved as safepoints. |
| 529 | static CPURegList GetSafepointSavedRegisters(); |
| 530 | |
| 531 | bool IsEmpty() const { |
| 532 | DCHECK(IsValid()); |
| 533 | return list_ == 0; |
| 534 | } |
| 535 | |
| 536 | bool IncludesAliasOf(const CPURegister& other1, |
| 537 | const CPURegister& other2 = NoCPUReg, |
| 538 | const CPURegister& other3 = NoCPUReg, |
| 539 | const CPURegister& other4 = NoCPUReg) const { |
| 540 | DCHECK(IsValid()); |
| 541 | RegList list = 0; |
| 542 | if (!other1.IsNone() && (other1.type() == type_)) list |= other1.Bit(); |
| 543 | if (!other2.IsNone() && (other2.type() == type_)) list |= other2.Bit(); |
| 544 | if (!other3.IsNone() && (other3.type() == type_)) list |= other3.Bit(); |
| 545 | if (!other4.IsNone() && (other4.type() == type_)) list |= other4.Bit(); |
| 546 | return (list_ & list) != 0; |
| 547 | } |
| 548 | |
| 549 | int Count() const { |
| 550 | DCHECK(IsValid()); |
| 551 | return CountSetBits(list_, kRegListSizeInBits); |
| 552 | } |
| 553 | |
| 554 | unsigned RegisterSizeInBits() const { |
| 555 | DCHECK(IsValid()); |
| 556 | return size_; |
| 557 | } |
| 558 | |
| 559 | unsigned RegisterSizeInBytes() const { |
| 560 | int size_in_bits = RegisterSizeInBits(); |
| 561 | DCHECK((size_in_bits % kBitsPerByte) == 0); |
| 562 | return size_in_bits / kBitsPerByte; |
| 563 | } |
| 564 | |
| 565 | unsigned TotalSizeInBytes() const { |
| 566 | DCHECK(IsValid()); |
| 567 | return RegisterSizeInBytes() * Count(); |
| 568 | } |
| 569 | |
| 570 | private: |
| 571 | RegList list_; |
| 572 | unsigned size_; |
| 573 | CPURegister::RegisterType type_; |
| 574 | |
| 575 | bool IsValid() const { |
| 576 | const RegList kValidRegisters = 0x8000000ffffffff; |
| 577 | const RegList kValidFPRegisters = 0x0000000ffffffff; |
| 578 | switch (type_) { |
| 579 | case CPURegister::kRegister: |
| 580 | return (list_ & kValidRegisters) == list_; |
| 581 | case CPURegister::kFPRegister: |
| 582 | return (list_ & kValidFPRegisters) == list_; |
| 583 | case CPURegister::kNoRegister: |
| 584 | return list_ == 0; |
| 585 | default: |
| 586 | UNREACHABLE(); |
| 587 | return false; |
| 588 | } |
| 589 | } |
| 590 | }; |
| 591 | |
| 592 | |
| 593 | // AAPCS64 callee-saved registers. |
| 594 | #define kCalleeSaved CPURegList::GetCalleeSaved() |
| 595 | #define kCalleeSavedFP CPURegList::GetCalleeSavedFP() |
| 596 | |
| 597 | |
| 598 | // AAPCS64 caller-saved registers. Note that this includes lr. |
| 599 | #define kCallerSaved CPURegList::GetCallerSaved() |
| 600 | #define kCallerSavedFP CPURegList::GetCallerSavedFP() |
| 601 | |
| 602 | // ----------------------------------------------------------------------------- |
| 603 | // Immediates. |
| 604 | class Immediate { |
| 605 | public: |
| 606 | template<typename T> |
| 607 | inline explicit Immediate(Handle<T> handle); |
| 608 | |
| 609 | // This is allowed to be an implicit constructor because Immediate is |
| 610 | // a wrapper class that doesn't normally perform any type conversion. |
| 611 | template<typename T> |
| 612 | inline Immediate(T value); // NOLINT(runtime/explicit) |
| 613 | |
| 614 | template<typename T> |
| 615 | inline Immediate(T value, RelocInfo::Mode rmode); |
| 616 | |
| 617 | int64_t value() const { return value_; } |
| 618 | RelocInfo::Mode rmode() const { return rmode_; } |
| 619 | |
| 620 | private: |
| 621 | void InitializeHandle(Handle<Object> value); |
| 622 | |
| 623 | int64_t value_; |
| 624 | RelocInfo::Mode rmode_; |
| 625 | }; |
| 626 | |
| 627 | |
| 628 | // ----------------------------------------------------------------------------- |
| 629 | // Operands. |
| 630 | const int kSmiShift = kSmiTagSize + kSmiShiftSize; |
| 631 | const uint64_t kSmiShiftMask = (1UL << kSmiShift) - 1; |
| 632 | |
| 633 | // Represents an operand in a machine instruction. |
| 634 | class Operand { |
| 635 | // TODO(all): If necessary, study more in details which methods |
| 636 | // TODO(all): should be inlined or not. |
| 637 | public: |
| 638 | // rm, {<shift> {#<shift_amount>}} |
| 639 | // where <shift> is one of {LSL, LSR, ASR, ROR}. |
| 640 | // <shift_amount> is uint6_t. |
| 641 | // This is allowed to be an implicit constructor because Operand is |
| 642 | // a wrapper class that doesn't normally perform any type conversion. |
| 643 | inline Operand(Register reg, |
| 644 | Shift shift = LSL, |
| 645 | unsigned shift_amount = 0); // NOLINT(runtime/explicit) |
| 646 | |
| 647 | // rm, <extend> {#<shift_amount>} |
| 648 | // where <extend> is one of {UXTB, UXTH, UXTW, UXTX, SXTB, SXTH, SXTW, SXTX}. |
| 649 | // <shift_amount> is uint2_t. |
| 650 | inline Operand(Register reg, |
| 651 | Extend extend, |
| 652 | unsigned shift_amount = 0); |
| 653 | |
| 654 | template<typename T> |
| 655 | inline explicit Operand(Handle<T> handle); |
| 656 | |
| 657 | // Implicit constructor for all int types, ExternalReference, and Smi. |
| 658 | template<typename T> |
| 659 | inline Operand(T t); // NOLINT(runtime/explicit) |
| 660 | |
| 661 | // Implicit constructor for int types. |
| 662 | template<typename T> |
| 663 | inline Operand(T t, RelocInfo::Mode rmode); |
| 664 | |
| 665 | inline bool IsImmediate() const; |
| 666 | inline bool IsShiftedRegister() const; |
| 667 | inline bool IsExtendedRegister() const; |
| 668 | inline bool IsZero() const; |
| 669 | |
| 670 | // This returns an LSL shift (<= 4) operand as an equivalent extend operand, |
| 671 | // which helps in the encoding of instructions that use the stack pointer. |
| 672 | inline Operand ToExtendedRegister() const; |
| 673 | |
| 674 | inline Immediate immediate() const; |
| 675 | inline int64_t ImmediateValue() const; |
| 676 | inline Register reg() const; |
| 677 | inline Shift shift() const; |
| 678 | inline Extend extend() const; |
| 679 | inline unsigned shift_amount() const; |
| 680 | |
| 681 | // Relocation information. |
| 682 | bool NeedsRelocation(const Assembler* assembler) const; |
| 683 | |
| 684 | // Helpers |
| 685 | inline static Operand UntagSmi(Register smi); |
| 686 | inline static Operand UntagSmiAndScale(Register smi, int scale); |
| 687 | |
| 688 | private: |
| 689 | Immediate immediate_; |
| 690 | Register reg_; |
| 691 | Shift shift_; |
| 692 | Extend extend_; |
| 693 | unsigned shift_amount_; |
| 694 | }; |
| 695 | |
| 696 | |
| 697 | // MemOperand represents a memory operand in a load or store instruction. |
| 698 | class MemOperand { |
| 699 | public: |
| 700 | inline MemOperand(); |
| 701 | inline explicit MemOperand(Register base, |
| 702 | int64_t offset = 0, |
| 703 | AddrMode addrmode = Offset); |
| 704 | inline explicit MemOperand(Register base, |
| 705 | Register regoffset, |
| 706 | Shift shift = LSL, |
| 707 | unsigned shift_amount = 0); |
| 708 | inline explicit MemOperand(Register base, |
| 709 | Register regoffset, |
| 710 | Extend extend, |
| 711 | unsigned shift_amount = 0); |
| 712 | inline explicit MemOperand(Register base, |
| 713 | const Operand& offset, |
| 714 | AddrMode addrmode = Offset); |
| 715 | |
| 716 | const Register& base() const { return base_; } |
| 717 | const Register& regoffset() const { return regoffset_; } |
| 718 | int64_t offset() const { return offset_; } |
| 719 | AddrMode addrmode() const { return addrmode_; } |
| 720 | Shift shift() const { return shift_; } |
| 721 | Extend extend() const { return extend_; } |
| 722 | unsigned shift_amount() const { return shift_amount_; } |
| 723 | inline bool IsImmediateOffset() const; |
| 724 | inline bool IsRegisterOffset() const; |
| 725 | inline bool IsPreIndex() const; |
| 726 | inline bool IsPostIndex() const; |
| 727 | |
| 728 | // For offset modes, return the offset as an Operand. This helper cannot |
| 729 | // handle indexed modes. |
| 730 | inline Operand OffsetAsOperand() const; |
| 731 | |
| 732 | enum PairResult { |
| 733 | kNotPair, // Can't use a pair instruction. |
| 734 | kPairAB, // Can use a pair instruction (operandA has lower address). |
| 735 | kPairBA // Can use a pair instruction (operandB has lower address). |
| 736 | }; |
| 737 | // Check if two MemOperand are consistent for stp/ldp use. |
| 738 | static PairResult AreConsistentForPair(const MemOperand& operandA, |
| 739 | const MemOperand& operandB, |
| 740 | int access_size_log2 = kXRegSizeLog2); |
| 741 | |
| 742 | private: |
| 743 | Register base_; |
| 744 | Register regoffset_; |
| 745 | int64_t offset_; |
| 746 | AddrMode addrmode_; |
| 747 | Shift shift_; |
| 748 | Extend extend_; |
| 749 | unsigned shift_amount_; |
| 750 | }; |
| 751 | |
| 752 | |
| 753 | class ConstPool { |
| 754 | public: |
| 755 | explicit ConstPool(Assembler* assm) |
| 756 | : assm_(assm), |
| 757 | first_use_(-1), |
| 758 | shared_entries_count(0) {} |
| 759 | void RecordEntry(intptr_t data, RelocInfo::Mode mode); |
| 760 | int EntryCount() const { |
| 761 | return shared_entries_count + unique_entries_.size(); |
| 762 | } |
| 763 | bool IsEmpty() const { |
| 764 | return shared_entries_.empty() && unique_entries_.empty(); |
| 765 | } |
| 766 | // Distance in bytes between the current pc and the first instruction |
| 767 | // using the pool. If there are no pending entries return kMaxInt. |
| 768 | int DistanceToFirstUse(); |
| 769 | // Offset after which instructions using the pool will be out of range. |
| 770 | int MaxPcOffset(); |
| 771 | // Maximum size the constant pool can be with current entries. It always |
| 772 | // includes alignment padding and branch over. |
| 773 | int WorstCaseSize(); |
| 774 | // Size in bytes of the literal pool *if* it is emitted at the current |
| 775 | // pc. The size will include the branch over the pool if it was requested. |
| 776 | int SizeIfEmittedAtCurrentPc(bool require_jump); |
| 777 | // Emit the literal pool at the current pc with a branch over the pool if |
| 778 | // requested. |
| 779 | void Emit(bool require_jump); |
| 780 | // Discard any pending pool entries. |
| 781 | void Clear(); |
| 782 | |
| 783 | private: |
| 784 | bool CanBeShared(RelocInfo::Mode mode); |
| 785 | void EmitMarker(); |
| 786 | void EmitGuard(); |
| 787 | void EmitEntries(); |
| 788 | |
| 789 | Assembler* assm_; |
| 790 | // Keep track of the first instruction requiring a constant pool entry |
| 791 | // since the previous constant pool was emitted. |
| 792 | int first_use_; |
| 793 | // values, pc offset(s) of entries which can be shared. |
| 794 | std::multimap<uint64_t, int> shared_entries_; |
| 795 | // Number of distinct literal in shared entries. |
| 796 | int shared_entries_count; |
| 797 | // values, pc offset of entries which cannot be shared. |
| 798 | std::vector<std::pair<uint64_t, int> > unique_entries_; |
| 799 | }; |
| 800 | |
| 801 | |
| 802 | // ----------------------------------------------------------------------------- |
| 803 | // Assembler. |
| 804 | |
| 805 | class Assembler : public AssemblerBase { |
| 806 | public: |
| 807 | // Create an assembler. Instructions and relocation information are emitted |
| 808 | // into a buffer, with the instructions starting from the beginning and the |
| 809 | // relocation information starting from the end of the buffer. See CodeDesc |
| 810 | // for a detailed comment on the layout (globals.h). |
| 811 | // |
| 812 | // If the provided buffer is NULL, the assembler allocates and grows its own |
| 813 | // buffer, and buffer_size determines the initial buffer size. The buffer is |
| 814 | // owned by the assembler and deallocated upon destruction of the assembler. |
| 815 | // |
| 816 | // If the provided buffer is not NULL, the assembler uses the provided buffer |
| 817 | // for code generation and assumes its size to be buffer_size. If the buffer |
| 818 | // is too small, a fatal error occurs. No deallocation of the buffer is done |
| 819 | // upon destruction of the assembler. |
| 820 | Assembler(Isolate* arg_isolate, void* buffer, int buffer_size); |
| 821 | |
| 822 | virtual ~Assembler(); |
| 823 | |
| 824 | virtual void AbortedCodeGeneration() { |
| 825 | constpool_.Clear(); |
| 826 | } |
| 827 | |
| 828 | // System functions --------------------------------------------------------- |
| 829 | // Start generating code from the beginning of the buffer, discarding any code |
| 830 | // and data that has already been emitted into the buffer. |
| 831 | // |
| 832 | // In order to avoid any accidental transfer of state, Reset DCHECKs that the |
| 833 | // constant pool is not blocked. |
| 834 | void Reset(); |
| 835 | |
| 836 | // GetCode emits any pending (non-emitted) code and fills the descriptor |
| 837 | // desc. GetCode() is idempotent; it returns the same result if no other |
| 838 | // Assembler functions are invoked in between GetCode() calls. |
| 839 | // |
| 840 | // The descriptor (desc) can be NULL. In that case, the code is finalized as |
| 841 | // usual, but the descriptor is not populated. |
| 842 | void GetCode(CodeDesc* desc); |
| 843 | |
| 844 | // Insert the smallest number of nop instructions |
| 845 | // possible to align the pc offset to a multiple |
| 846 | // of m. m must be a power of 2 (>= 4). |
| 847 | void Align(int m); |
| 848 | |
| 849 | inline void Unreachable(); |
| 850 | |
| 851 | // Label -------------------------------------------------------------------- |
| 852 | // Bind a label to the current pc. Note that labels can only be bound once, |
| 853 | // and if labels are linked to other instructions, they _must_ be bound |
| 854 | // before they go out of scope. |
| 855 | void bind(Label* label); |
| 856 | |
| 857 | |
| 858 | // RelocInfo and pools ------------------------------------------------------ |
| 859 | |
| 860 | // Record relocation information for current pc_. |
| 861 | void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0); |
| 862 | |
| 863 | // Return the address in the constant pool of the code target address used by |
| 864 | // the branch/call instruction at pc. |
| 865 | inline static Address target_pointer_address_at(Address pc); |
| 866 | |
| 867 | // Read/Modify the code target address in the branch/call instruction at pc. |
| 868 | inline static Address target_address_at(Address pc, |
| 869 | ConstantPoolArray* constant_pool); |
| 870 | inline static void set_target_address_at(Address pc, |
| 871 | ConstantPoolArray* constant_pool, |
| 872 | Address target, |
| 873 | ICacheFlushMode icache_flush_mode = |
| 874 | FLUSH_ICACHE_IF_NEEDED); |
| 875 | static inline Address target_address_at(Address pc, Code* code); |
| 876 | static inline void set_target_address_at(Address pc, |
| 877 | Code* code, |
| 878 | Address target, |
| 879 | ICacheFlushMode icache_flush_mode = |
| 880 | FLUSH_ICACHE_IF_NEEDED); |
| 881 | |
| 882 | // Return the code target address at a call site from the return address of |
| 883 | // that call in the instruction stream. |
| 884 | inline static Address target_address_from_return_address(Address pc); |
| 885 | |
| 886 | // Given the address of the beginning of a call, return the address in the |
| 887 | // instruction stream that call will return from. |
| 888 | inline static Address return_address_from_call_start(Address pc); |
| 889 | |
| 890 | // Return the code target address of the patch debug break slot |
| 891 | inline static Address break_address_from_return_address(Address pc); |
| 892 | |
| 893 | // This sets the branch destination (which is in the constant pool on ARM). |
| 894 | // This is for calls and branches within generated code. |
| 895 | inline static void deserialization_set_special_target_at( |
| 896 | Address constant_pool_entry, Code* code, Address target); |
| 897 | |
| 898 | // All addresses in the constant pool are the same size as pointers. |
| 899 | static const int kSpecialTargetSize = kPointerSize; |
| 900 | |
| 901 | // The sizes of the call sequences emitted by MacroAssembler::Call. |
| 902 | // Wherever possible, use MacroAssembler::CallSize instead of these constants, |
| 903 | // as it will choose the correct value for a given relocation mode. |
| 904 | // |
| 905 | // Without relocation: |
| 906 | // movz temp, #(target & 0x000000000000ffff) |
| 907 | // movk temp, #(target & 0x00000000ffff0000) |
| 908 | // movk temp, #(target & 0x0000ffff00000000) |
| 909 | // blr temp |
| 910 | // |
| 911 | // With relocation: |
| 912 | // ldr temp, =target |
| 913 | // blr temp |
| 914 | static const int kCallSizeWithoutRelocation = 4 * kInstructionSize; |
| 915 | static const int kCallSizeWithRelocation = 2 * kInstructionSize; |
| 916 | |
| 917 | // Size of the generated code in bytes |
| 918 | uint64_t SizeOfGeneratedCode() const { |
| 919 | DCHECK((pc_ >= buffer_) && (pc_ < (buffer_ + buffer_size_))); |
| 920 | return pc_ - buffer_; |
| 921 | } |
| 922 | |
| 923 | // Return the code size generated from label to the current position. |
| 924 | uint64_t SizeOfCodeGeneratedSince(const Label* label) { |
| 925 | DCHECK(label->is_bound()); |
| 926 | DCHECK(pc_offset() >= label->pos()); |
| 927 | DCHECK(pc_offset() < buffer_size_); |
| 928 | return pc_offset() - label->pos(); |
| 929 | } |
| 930 | |
| 931 | // Check the size of the code generated since the given label. This function |
| 932 | // is used primarily to work around comparisons between signed and unsigned |
| 933 | // quantities, since V8 uses both. |
| 934 | // TODO(jbramley): Work out what sign to use for these things and if possible, |
| 935 | // change things to be consistent. |
| 936 | void AssertSizeOfCodeGeneratedSince(const Label* label, ptrdiff_t size) { |
| 937 | DCHECK(size >= 0); |
| 938 | DCHECK(static_cast<uint64_t>(size) == SizeOfCodeGeneratedSince(label)); |
| 939 | } |
| 940 | |
| 941 | // Return the number of instructions generated from label to the |
| 942 | // current position. |
| 943 | int InstructionsGeneratedSince(const Label* label) { |
| 944 | return SizeOfCodeGeneratedSince(label) / kInstructionSize; |
| 945 | } |
| 946 | |
| 947 | // Number of instructions generated for the return sequence in |
| 948 | // FullCodeGenerator::EmitReturnSequence. |
| 949 | static const int kJSRetSequenceInstructions = 7; |
| 950 | // Distance between start of patched return sequence and the emitted address |
| 951 | // to jump to. |
| 952 | static const int kPatchReturnSequenceAddressOffset = 0; |
| 953 | static const int kPatchDebugBreakSlotAddressOffset = 0; |
| 954 | |
| 955 | // Number of instructions necessary to be able to later patch it to a call. |
| 956 | // See DebugCodegen::GenerateSlot() and |
| 957 | // BreakLocationIterator::SetDebugBreakAtSlot(). |
| 958 | static const int kDebugBreakSlotInstructions = 4; |
| 959 | static const int kDebugBreakSlotLength = |
| 960 | kDebugBreakSlotInstructions * kInstructionSize; |
| 961 | |
| 962 | static const int kPatchDebugBreakSlotReturnOffset = 2 * kInstructionSize; |
| 963 | |
| 964 | // Prevent contant pool emission until EndBlockConstPool is called. |
| 965 | // Call to this function can be nested but must be followed by an equal |
| 966 | // number of call to EndBlockConstpool. |
| 967 | void StartBlockConstPool(); |
| 968 | |
| 969 | // Resume constant pool emission. Need to be called as many time as |
| 970 | // StartBlockConstPool to have an effect. |
| 971 | void EndBlockConstPool(); |
| 972 | |
| 973 | bool is_const_pool_blocked() const; |
| 974 | static bool IsConstantPoolAt(Instruction* instr); |
| 975 | static int ConstantPoolSizeAt(Instruction* instr); |
| 976 | // See Assembler::CheckConstPool for more info. |
| 977 | void EmitPoolGuard(); |
| 978 | |
| 979 | // Prevent veneer pool emission until EndBlockVeneerPool is called. |
| 980 | // Call to this function can be nested but must be followed by an equal |
| 981 | // number of call to EndBlockConstpool. |
| 982 | void StartBlockVeneerPool(); |
| 983 | |
| 984 | // Resume constant pool emission. Need to be called as many time as |
| 985 | // StartBlockVeneerPool to have an effect. |
| 986 | void EndBlockVeneerPool(); |
| 987 | |
| 988 | bool is_veneer_pool_blocked() const { |
| 989 | return veneer_pool_blocked_nesting_ > 0; |
| 990 | } |
| 991 | |
| 992 | // Block/resume emission of constant pools and veneer pools. |
| 993 | void StartBlockPools() { |
| 994 | StartBlockConstPool(); |
| 995 | StartBlockVeneerPool(); |
| 996 | } |
| 997 | void EndBlockPools() { |
| 998 | EndBlockConstPool(); |
| 999 | EndBlockVeneerPool(); |
| 1000 | } |
| 1001 | |
| 1002 | // Debugging ---------------------------------------------------------------- |
| 1003 | PositionsRecorder* positions_recorder() { return &positions_recorder_; } |
| 1004 | void RecordComment(const char* msg); |
| 1005 | int buffer_space() const; |
| 1006 | |
| 1007 | // Mark address of the ExitJSFrame code. |
| 1008 | void RecordJSReturn(); |
| 1009 | |
| 1010 | // Mark address of a debug break slot. |
| 1011 | void RecordDebugBreakSlot(); |
| 1012 | |
| 1013 | // Record the emission of a constant pool. |
| 1014 | // |
| 1015 | // The emission of constant and veneer pools depends on the size of the code |
| 1016 | // generated and the number of RelocInfo recorded. |
| 1017 | // The Debug mechanism needs to map code offsets between two versions of a |
| 1018 | // function, compiled with and without debugger support (see for example |
| 1019 | // Debug::PrepareForBreakPoints()). |
| 1020 | // Compiling functions with debugger support generates additional code |
| 1021 | // (DebugCodegen::GenerateSlot()). This may affect the emission of the pools |
| 1022 | // and cause the version of the code with debugger support to have pools |
| 1023 | // generated in different places. |
| 1024 | // Recording the position and size of emitted pools allows to correctly |
| 1025 | // compute the offset mappings between the different versions of a function in |
| 1026 | // all situations. |
| 1027 | // |
| 1028 | // The parameter indicates the size of the pool (in bytes), including |
| 1029 | // the marker and branch over the data. |
| 1030 | void RecordConstPool(int size); |
| 1031 | |
| 1032 | |
| 1033 | // Instruction set functions ------------------------------------------------ |
| 1034 | |
| 1035 | // Branch / Jump instructions. |
| 1036 | // For branches offsets are scaled, i.e. they in instrcutions not in bytes. |
| 1037 | // Branch to register. |
| 1038 | void br(const Register& xn); |
| 1039 | |
| 1040 | // Branch-link to register. |
| 1041 | void blr(const Register& xn); |
| 1042 | |
| 1043 | // Branch to register with return hint. |
| 1044 | void ret(const Register& xn = lr); |
| 1045 | |
| 1046 | // Unconditional branch to label. |
| 1047 | void b(Label* label); |
| 1048 | |
| 1049 | // Conditional branch to label. |
| 1050 | void b(Label* label, Condition cond); |
| 1051 | |
| 1052 | // Unconditional branch to PC offset. |
| 1053 | void b(int imm26); |
| 1054 | |
| 1055 | // Conditional branch to PC offset. |
| 1056 | void b(int imm19, Condition cond); |
| 1057 | |
| 1058 | // Branch-link to label / pc offset. |
| 1059 | void bl(Label* label); |
| 1060 | void bl(int imm26); |
| 1061 | |
| 1062 | // Compare and branch to label / pc offset if zero. |
| 1063 | void cbz(const Register& rt, Label* label); |
| 1064 | void cbz(const Register& rt, int imm19); |
| 1065 | |
| 1066 | // Compare and branch to label / pc offset if not zero. |
| 1067 | void cbnz(const Register& rt, Label* label); |
| 1068 | void cbnz(const Register& rt, int imm19); |
| 1069 | |
| 1070 | // Test bit and branch to label / pc offset if zero. |
| 1071 | void tbz(const Register& rt, unsigned bit_pos, Label* label); |
| 1072 | void tbz(const Register& rt, unsigned bit_pos, int imm14); |
| 1073 | |
| 1074 | // Test bit and branch to label / pc offset if not zero. |
| 1075 | void tbnz(const Register& rt, unsigned bit_pos, Label* label); |
| 1076 | void tbnz(const Register& rt, unsigned bit_pos, int imm14); |
| 1077 | |
| 1078 | // Address calculation instructions. |
| 1079 | // Calculate a PC-relative address. Unlike for branches the offset in adr is |
| 1080 | // unscaled (i.e. the result can be unaligned). |
| 1081 | void adr(const Register& rd, Label* label); |
| 1082 | void adr(const Register& rd, int imm21); |
| 1083 | |
| 1084 | // Data Processing instructions. |
| 1085 | // Add. |
| 1086 | void add(const Register& rd, |
| 1087 | const Register& rn, |
| 1088 | const Operand& operand); |
| 1089 | |
| 1090 | // Add and update status flags. |
| 1091 | void adds(const Register& rd, |
| 1092 | const Register& rn, |
| 1093 | const Operand& operand); |
| 1094 | |
| 1095 | // Compare negative. |
| 1096 | void cmn(const Register& rn, const Operand& operand); |
| 1097 | |
| 1098 | // Subtract. |
| 1099 | void sub(const Register& rd, |
| 1100 | const Register& rn, |
| 1101 | const Operand& operand); |
| 1102 | |
| 1103 | // Subtract and update status flags. |
| 1104 | void subs(const Register& rd, |
| 1105 | const Register& rn, |
| 1106 | const Operand& operand); |
| 1107 | |
| 1108 | // Compare. |
| 1109 | void cmp(const Register& rn, const Operand& operand); |
| 1110 | |
| 1111 | // Negate. |
| 1112 | void neg(const Register& rd, |
| 1113 | const Operand& operand); |
| 1114 | |
| 1115 | // Negate and update status flags. |
| 1116 | void negs(const Register& rd, |
| 1117 | const Operand& operand); |
| 1118 | |
| 1119 | // Add with carry bit. |
| 1120 | void adc(const Register& rd, |
| 1121 | const Register& rn, |
| 1122 | const Operand& operand); |
| 1123 | |
| 1124 | // Add with carry bit and update status flags. |
| 1125 | void adcs(const Register& rd, |
| 1126 | const Register& rn, |
| 1127 | const Operand& operand); |
| 1128 | |
| 1129 | // Subtract with carry bit. |
| 1130 | void sbc(const Register& rd, |
| 1131 | const Register& rn, |
| 1132 | const Operand& operand); |
| 1133 | |
| 1134 | // Subtract with carry bit and update status flags. |
| 1135 | void sbcs(const Register& rd, |
| 1136 | const Register& rn, |
| 1137 | const Operand& operand); |
| 1138 | |
| 1139 | // Negate with carry bit. |
| 1140 | void ngc(const Register& rd, |
| 1141 | const Operand& operand); |
| 1142 | |
| 1143 | // Negate with carry bit and update status flags. |
| 1144 | void ngcs(const Register& rd, |
| 1145 | const Operand& operand); |
| 1146 | |
| 1147 | // Logical instructions. |
| 1148 | // Bitwise and (A & B). |
| 1149 | void and_(const Register& rd, |
| 1150 | const Register& rn, |
| 1151 | const Operand& operand); |
| 1152 | |
| 1153 | // Bitwise and (A & B) and update status flags. |
| 1154 | void ands(const Register& rd, |
| 1155 | const Register& rn, |
| 1156 | const Operand& operand); |
| 1157 | |
| 1158 | // Bit test, and set flags. |
| 1159 | void tst(const Register& rn, const Operand& operand); |
| 1160 | |
| 1161 | // Bit clear (A & ~B). |
| 1162 | void bic(const Register& rd, |
| 1163 | const Register& rn, |
| 1164 | const Operand& operand); |
| 1165 | |
| 1166 | // Bit clear (A & ~B) and update status flags. |
| 1167 | void bics(const Register& rd, |
| 1168 | const Register& rn, |
| 1169 | const Operand& operand); |
| 1170 | |
| 1171 | // Bitwise or (A | B). |
| 1172 | void orr(const Register& rd, const Register& rn, const Operand& operand); |
| 1173 | |
| 1174 | // Bitwise nor (A | ~B). |
| 1175 | void orn(const Register& rd, const Register& rn, const Operand& operand); |
| 1176 | |
| 1177 | // Bitwise eor/xor (A ^ B). |
| 1178 | void eor(const Register& rd, const Register& rn, const Operand& operand); |
| 1179 | |
| 1180 | // Bitwise enor/xnor (A ^ ~B). |
| 1181 | void eon(const Register& rd, const Register& rn, const Operand& operand); |
| 1182 | |
| 1183 | // Logical shift left variable. |
| 1184 | void lslv(const Register& rd, const Register& rn, const Register& rm); |
| 1185 | |
| 1186 | // Logical shift right variable. |
| 1187 | void lsrv(const Register& rd, const Register& rn, const Register& rm); |
| 1188 | |
| 1189 | // Arithmetic shift right variable. |
| 1190 | void asrv(const Register& rd, const Register& rn, const Register& rm); |
| 1191 | |
| 1192 | // Rotate right variable. |
| 1193 | void rorv(const Register& rd, const Register& rn, const Register& rm); |
| 1194 | |
| 1195 | // Bitfield instructions. |
| 1196 | // Bitfield move. |
| 1197 | void bfm(const Register& rd, |
| 1198 | const Register& rn, |
| 1199 | unsigned immr, |
| 1200 | unsigned imms); |
| 1201 | |
| 1202 | // Signed bitfield move. |
| 1203 | void sbfm(const Register& rd, |
| 1204 | const Register& rn, |
| 1205 | unsigned immr, |
| 1206 | unsigned imms); |
| 1207 | |
| 1208 | // Unsigned bitfield move. |
| 1209 | void ubfm(const Register& rd, |
| 1210 | const Register& rn, |
| 1211 | unsigned immr, |
| 1212 | unsigned imms); |
| 1213 | |
| 1214 | // Bfm aliases. |
| 1215 | // Bitfield insert. |
| 1216 | void bfi(const Register& rd, |
| 1217 | const Register& rn, |
| 1218 | unsigned lsb, |
| 1219 | unsigned width) { |
| 1220 | DCHECK(width >= 1); |
| 1221 | DCHECK(lsb + width <= rn.SizeInBits()); |
| 1222 | bfm(rd, rn, (rd.SizeInBits() - lsb) & (rd.SizeInBits() - 1), width - 1); |
| 1223 | } |
| 1224 | |
| 1225 | // Bitfield extract and insert low. |
| 1226 | void bfxil(const Register& rd, |
| 1227 | const Register& rn, |
| 1228 | unsigned lsb, |
| 1229 | unsigned width) { |
| 1230 | DCHECK(width >= 1); |
| 1231 | DCHECK(lsb + width <= rn.SizeInBits()); |
| 1232 | bfm(rd, rn, lsb, lsb + width - 1); |
| 1233 | } |
| 1234 | |
| 1235 | // Sbfm aliases. |
| 1236 | // Arithmetic shift right. |
| 1237 | void asr(const Register& rd, const Register& rn, unsigned shift) { |
| 1238 | DCHECK(shift < rd.SizeInBits()); |
| 1239 | sbfm(rd, rn, shift, rd.SizeInBits() - 1); |
| 1240 | } |
| 1241 | |
| 1242 | // Signed bitfield insert in zero. |
| 1243 | void sbfiz(const Register& rd, |
| 1244 | const Register& rn, |
| 1245 | unsigned lsb, |
| 1246 | unsigned width) { |
| 1247 | DCHECK(width >= 1); |
| 1248 | DCHECK(lsb + width <= rn.SizeInBits()); |
| 1249 | sbfm(rd, rn, (rd.SizeInBits() - lsb) & (rd.SizeInBits() - 1), width - 1); |
| 1250 | } |
| 1251 | |
| 1252 | // Signed bitfield extract. |
| 1253 | void sbfx(const Register& rd, |
| 1254 | const Register& rn, |
| 1255 | unsigned lsb, |
| 1256 | unsigned width) { |
| 1257 | DCHECK(width >= 1); |
| 1258 | DCHECK(lsb + width <= rn.SizeInBits()); |
| 1259 | sbfm(rd, rn, lsb, lsb + width - 1); |
| 1260 | } |
| 1261 | |
| 1262 | // Signed extend byte. |
| 1263 | void sxtb(const Register& rd, const Register& rn) { |
| 1264 | sbfm(rd, rn, 0, 7); |
| 1265 | } |
| 1266 | |
| 1267 | // Signed extend halfword. |
| 1268 | void sxth(const Register& rd, const Register& rn) { |
| 1269 | sbfm(rd, rn, 0, 15); |
| 1270 | } |
| 1271 | |
| 1272 | // Signed extend word. |
| 1273 | void sxtw(const Register& rd, const Register& rn) { |
| 1274 | sbfm(rd, rn, 0, 31); |
| 1275 | } |
| 1276 | |
| 1277 | // Ubfm aliases. |
| 1278 | // Logical shift left. |
| 1279 | void lsl(const Register& rd, const Register& rn, unsigned shift) { |
| 1280 | unsigned reg_size = rd.SizeInBits(); |
| 1281 | DCHECK(shift < reg_size); |
| 1282 | ubfm(rd, rn, (reg_size - shift) % reg_size, reg_size - shift - 1); |
| 1283 | } |
| 1284 | |
| 1285 | // Logical shift right. |
| 1286 | void lsr(const Register& rd, const Register& rn, unsigned shift) { |
| 1287 | DCHECK(shift < rd.SizeInBits()); |
| 1288 | ubfm(rd, rn, shift, rd.SizeInBits() - 1); |
| 1289 | } |
| 1290 | |
| 1291 | // Unsigned bitfield insert in zero. |
| 1292 | void ubfiz(const Register& rd, |
| 1293 | const Register& rn, |
| 1294 | unsigned lsb, |
| 1295 | unsigned width) { |
| 1296 | DCHECK(width >= 1); |
| 1297 | DCHECK(lsb + width <= rn.SizeInBits()); |
| 1298 | ubfm(rd, rn, (rd.SizeInBits() - lsb) & (rd.SizeInBits() - 1), width - 1); |
| 1299 | } |
| 1300 | |
| 1301 | // Unsigned bitfield extract. |
| 1302 | void ubfx(const Register& rd, |
| 1303 | const Register& rn, |
| 1304 | unsigned lsb, |
| 1305 | unsigned width) { |
| 1306 | DCHECK(width >= 1); |
| 1307 | DCHECK(lsb + width <= rn.SizeInBits()); |
| 1308 | ubfm(rd, rn, lsb, lsb + width - 1); |
| 1309 | } |
| 1310 | |
| 1311 | // Unsigned extend byte. |
| 1312 | void uxtb(const Register& rd, const Register& rn) { |
| 1313 | ubfm(rd, rn, 0, 7); |
| 1314 | } |
| 1315 | |
| 1316 | // Unsigned extend halfword. |
| 1317 | void uxth(const Register& rd, const Register& rn) { |
| 1318 | ubfm(rd, rn, 0, 15); |
| 1319 | } |
| 1320 | |
| 1321 | // Unsigned extend word. |
| 1322 | void uxtw(const Register& rd, const Register& rn) { |
| 1323 | ubfm(rd, rn, 0, 31); |
| 1324 | } |
| 1325 | |
| 1326 | // Extract. |
| 1327 | void extr(const Register& rd, |
| 1328 | const Register& rn, |
| 1329 | const Register& rm, |
| 1330 | unsigned lsb); |
| 1331 | |
| 1332 | // Conditional select: rd = cond ? rn : rm. |
| 1333 | void csel(const Register& rd, |
| 1334 | const Register& rn, |
| 1335 | const Register& rm, |
| 1336 | Condition cond); |
| 1337 | |
| 1338 | // Conditional select increment: rd = cond ? rn : rm + 1. |
| 1339 | void csinc(const Register& rd, |
| 1340 | const Register& rn, |
| 1341 | const Register& rm, |
| 1342 | Condition cond); |
| 1343 | |
| 1344 | // Conditional select inversion: rd = cond ? rn : ~rm. |
| 1345 | void csinv(const Register& rd, |
| 1346 | const Register& rn, |
| 1347 | const Register& rm, |
| 1348 | Condition cond); |
| 1349 | |
| 1350 | // Conditional select negation: rd = cond ? rn : -rm. |
| 1351 | void csneg(const Register& rd, |
| 1352 | const Register& rn, |
| 1353 | const Register& rm, |
| 1354 | Condition cond); |
| 1355 | |
| 1356 | // Conditional set: rd = cond ? 1 : 0. |
| 1357 | void cset(const Register& rd, Condition cond); |
| 1358 | |
| 1359 | // Conditional set minus: rd = cond ? -1 : 0. |
| 1360 | void csetm(const Register& rd, Condition cond); |
| 1361 | |
| 1362 | // Conditional increment: rd = cond ? rn + 1 : rn. |
| 1363 | void cinc(const Register& rd, const Register& rn, Condition cond); |
| 1364 | |
| 1365 | // Conditional invert: rd = cond ? ~rn : rn. |
| 1366 | void cinv(const Register& rd, const Register& rn, Condition cond); |
| 1367 | |
| 1368 | // Conditional negate: rd = cond ? -rn : rn. |
| 1369 | void cneg(const Register& rd, const Register& rn, Condition cond); |
| 1370 | |
| 1371 | // Extr aliases. |
| 1372 | void ror(const Register& rd, const Register& rs, unsigned shift) { |
| 1373 | extr(rd, rs, rs, shift); |
| 1374 | } |
| 1375 | |
| 1376 | // Conditional comparison. |
| 1377 | // Conditional compare negative. |
| 1378 | void ccmn(const Register& rn, |
| 1379 | const Operand& operand, |
| 1380 | StatusFlags nzcv, |
| 1381 | Condition cond); |
| 1382 | |
| 1383 | // Conditional compare. |
| 1384 | void ccmp(const Register& rn, |
| 1385 | const Operand& operand, |
| 1386 | StatusFlags nzcv, |
| 1387 | Condition cond); |
| 1388 | |
| 1389 | // Multiplication. |
| 1390 | // 32 x 32 -> 32-bit and 64 x 64 -> 64-bit multiply. |
| 1391 | void mul(const Register& rd, const Register& rn, const Register& rm); |
| 1392 | |
| 1393 | // 32 + 32 x 32 -> 32-bit and 64 + 64 x 64 -> 64-bit multiply accumulate. |
| 1394 | void madd(const Register& rd, |
| 1395 | const Register& rn, |
| 1396 | const Register& rm, |
| 1397 | const Register& ra); |
| 1398 | |
| 1399 | // -(32 x 32) -> 32-bit and -(64 x 64) -> 64-bit multiply. |
| 1400 | void mneg(const Register& rd, const Register& rn, const Register& rm); |
| 1401 | |
| 1402 | // 32 - 32 x 32 -> 32-bit and 64 - 64 x 64 -> 64-bit multiply subtract. |
| 1403 | void msub(const Register& rd, |
| 1404 | const Register& rn, |
| 1405 | const Register& rm, |
| 1406 | const Register& ra); |
| 1407 | |
| 1408 | // 32 x 32 -> 64-bit multiply. |
| 1409 | void smull(const Register& rd, const Register& rn, const Register& rm); |
| 1410 | |
| 1411 | // Xd = bits<127:64> of Xn * Xm. |
| 1412 | void smulh(const Register& rd, const Register& rn, const Register& rm); |
| 1413 | |
| 1414 | // Signed 32 x 32 -> 64-bit multiply and accumulate. |
| 1415 | void smaddl(const Register& rd, |
| 1416 | const Register& rn, |
| 1417 | const Register& rm, |
| 1418 | const Register& ra); |
| 1419 | |
| 1420 | // Unsigned 32 x 32 -> 64-bit multiply and accumulate. |
| 1421 | void umaddl(const Register& rd, |
| 1422 | const Register& rn, |
| 1423 | const Register& rm, |
| 1424 | const Register& ra); |
| 1425 | |
| 1426 | // Signed 32 x 32 -> 64-bit multiply and subtract. |
| 1427 | void smsubl(const Register& rd, |
| 1428 | const Register& rn, |
| 1429 | const Register& rm, |
| 1430 | const Register& ra); |
| 1431 | |
| 1432 | // Unsigned 32 x 32 -> 64-bit multiply and subtract. |
| 1433 | void umsubl(const Register& rd, |
| 1434 | const Register& rn, |
| 1435 | const Register& rm, |
| 1436 | const Register& ra); |
| 1437 | |
| 1438 | // Signed integer divide. |
| 1439 | void sdiv(const Register& rd, const Register& rn, const Register& rm); |
| 1440 | |
| 1441 | // Unsigned integer divide. |
| 1442 | void udiv(const Register& rd, const Register& rn, const Register& rm); |
| 1443 | |
| 1444 | // Bit count, bit reverse and endian reverse. |
| 1445 | void rbit(const Register& rd, const Register& rn); |
| 1446 | void rev16(const Register& rd, const Register& rn); |
| 1447 | void rev32(const Register& rd, const Register& rn); |
| 1448 | void rev(const Register& rd, const Register& rn); |
| 1449 | void clz(const Register& rd, const Register& rn); |
| 1450 | void cls(const Register& rd, const Register& rn); |
| 1451 | |
| 1452 | // Memory instructions. |
| 1453 | |
| 1454 | // Load integer or FP register. |
| 1455 | void ldr(const CPURegister& rt, const MemOperand& src); |
| 1456 | |
| 1457 | // Store integer or FP register. |
| 1458 | void str(const CPURegister& rt, const MemOperand& dst); |
| 1459 | |
| 1460 | // Load word with sign extension. |
| 1461 | void ldrsw(const Register& rt, const MemOperand& src); |
| 1462 | |
| 1463 | // Load byte. |
| 1464 | void ldrb(const Register& rt, const MemOperand& src); |
| 1465 | |
| 1466 | // Store byte. |
| 1467 | void strb(const Register& rt, const MemOperand& dst); |
| 1468 | |
| 1469 | // Load byte with sign extension. |
| 1470 | void ldrsb(const Register& rt, const MemOperand& src); |
| 1471 | |
| 1472 | // Load half-word. |
| 1473 | void ldrh(const Register& rt, const MemOperand& src); |
| 1474 | |
| 1475 | // Store half-word. |
| 1476 | void strh(const Register& rt, const MemOperand& dst); |
| 1477 | |
| 1478 | // Load half-word with sign extension. |
| 1479 | void ldrsh(const Register& rt, const MemOperand& src); |
| 1480 | |
| 1481 | // Load integer or FP register pair. |
| 1482 | void ldp(const CPURegister& rt, const CPURegister& rt2, |
| 1483 | const MemOperand& src); |
| 1484 | |
| 1485 | // Store integer or FP register pair. |
| 1486 | void stp(const CPURegister& rt, const CPURegister& rt2, |
| 1487 | const MemOperand& dst); |
| 1488 | |
| 1489 | // Load word pair with sign extension. |
| 1490 | void ldpsw(const Register& rt, const Register& rt2, const MemOperand& src); |
| 1491 | |
| 1492 | // Load integer or FP register pair, non-temporal. |
| 1493 | void ldnp(const CPURegister& rt, const CPURegister& rt2, |
| 1494 | const MemOperand& src); |
| 1495 | |
| 1496 | // Store integer or FP register pair, non-temporal. |
| 1497 | void stnp(const CPURegister& rt, const CPURegister& rt2, |
| 1498 | const MemOperand& dst); |
| 1499 | |
| 1500 | // Load literal to register from a pc relative address. |
| 1501 | void ldr_pcrel(const CPURegister& rt, int imm19); |
| 1502 | |
| 1503 | // Load literal to register. |
| 1504 | void ldr(const CPURegister& rt, const Immediate& imm); |
| 1505 | |
| 1506 | // Move instructions. The default shift of -1 indicates that the move |
| 1507 | // instruction will calculate an appropriate 16-bit immediate and left shift |
| 1508 | // that is equal to the 64-bit immediate argument. If an explicit left shift |
| 1509 | // is specified (0, 16, 32 or 48), the immediate must be a 16-bit value. |
| 1510 | // |
| 1511 | // For movk, an explicit shift can be used to indicate which half word should |
| 1512 | // be overwritten, eg. movk(x0, 0, 0) will overwrite the least-significant |
| 1513 | // half word with zero, whereas movk(x0, 0, 48) will overwrite the |
| 1514 | // most-significant. |
| 1515 | |
| 1516 | // Move and keep. |
| 1517 | void movk(const Register& rd, uint64_t imm, int shift = -1) { |
| 1518 | MoveWide(rd, imm, shift, MOVK); |
| 1519 | } |
| 1520 | |
| 1521 | // Move with non-zero. |
| 1522 | void movn(const Register& rd, uint64_t imm, int shift = -1) { |
| 1523 | MoveWide(rd, imm, shift, MOVN); |
| 1524 | } |
| 1525 | |
| 1526 | // Move with zero. |
| 1527 | void movz(const Register& rd, uint64_t imm, int shift = -1) { |
| 1528 | MoveWide(rd, imm, shift, MOVZ); |
| 1529 | } |
| 1530 | |
| 1531 | // Misc instructions. |
| 1532 | // Monitor debug-mode breakpoint. |
| 1533 | void brk(int code); |
| 1534 | |
| 1535 | // Halting debug-mode breakpoint. |
| 1536 | void hlt(int code); |
| 1537 | |
| 1538 | // Move register to register. |
| 1539 | void mov(const Register& rd, const Register& rn); |
| 1540 | |
| 1541 | // Move NOT(operand) to register. |
| 1542 | void mvn(const Register& rd, const Operand& operand); |
| 1543 | |
| 1544 | // System instructions. |
| 1545 | // Move to register from system register. |
| 1546 | void mrs(const Register& rt, SystemRegister sysreg); |
| 1547 | |
| 1548 | // Move from register to system register. |
| 1549 | void msr(SystemRegister sysreg, const Register& rt); |
| 1550 | |
| 1551 | // System hint. |
| 1552 | void hint(SystemHint code); |
| 1553 | |
| 1554 | // Data memory barrier |
| 1555 | void dmb(BarrierDomain domain, BarrierType type); |
| 1556 | |
| 1557 | // Data synchronization barrier |
| 1558 | void dsb(BarrierDomain domain, BarrierType type); |
| 1559 | |
| 1560 | // Instruction synchronization barrier |
| 1561 | void isb(); |
| 1562 | |
| 1563 | // Alias for system instructions. |
| 1564 | void nop() { hint(NOP); } |
| 1565 | |
| 1566 | // Different nop operations are used by the code generator to detect certain |
| 1567 | // states of the generated code. |
| 1568 | enum NopMarkerTypes { |
| 1569 | DEBUG_BREAK_NOP, |
| 1570 | INTERRUPT_CODE_NOP, |
| 1571 | ADR_FAR_NOP, |
| 1572 | FIRST_NOP_MARKER = DEBUG_BREAK_NOP, |
| 1573 | LAST_NOP_MARKER = ADR_FAR_NOP |
| 1574 | }; |
| 1575 | |
| 1576 | void nop(NopMarkerTypes n) { |
| 1577 | DCHECK((FIRST_NOP_MARKER <= n) && (n <= LAST_NOP_MARKER)); |
| 1578 | mov(Register::XRegFromCode(n), Register::XRegFromCode(n)); |
| 1579 | } |
| 1580 | |
| 1581 | // FP instructions. |
| 1582 | // Move immediate to FP register. |
| 1583 | void fmov(FPRegister fd, double imm); |
| 1584 | void fmov(FPRegister fd, float imm); |
| 1585 | |
| 1586 | // Move FP register to register. |
| 1587 | void fmov(Register rd, FPRegister fn); |
| 1588 | |
| 1589 | // Move register to FP register. |
| 1590 | void fmov(FPRegister fd, Register rn); |
| 1591 | |
| 1592 | // Move FP register to FP register. |
| 1593 | void fmov(FPRegister fd, FPRegister fn); |
| 1594 | |
| 1595 | // FP add. |
| 1596 | void fadd(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1597 | |
| 1598 | // FP subtract. |
| 1599 | void fsub(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1600 | |
| 1601 | // FP multiply. |
| 1602 | void fmul(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1603 | |
| 1604 | // FP fused multiply and add. |
| 1605 | void fmadd(const FPRegister& fd, |
| 1606 | const FPRegister& fn, |
| 1607 | const FPRegister& fm, |
| 1608 | const FPRegister& fa); |
| 1609 | |
| 1610 | // FP fused multiply and subtract. |
| 1611 | void fmsub(const FPRegister& fd, |
| 1612 | const FPRegister& fn, |
| 1613 | const FPRegister& fm, |
| 1614 | const FPRegister& fa); |
| 1615 | |
| 1616 | // FP fused multiply, add and negate. |
| 1617 | void fnmadd(const FPRegister& fd, |
| 1618 | const FPRegister& fn, |
| 1619 | const FPRegister& fm, |
| 1620 | const FPRegister& fa); |
| 1621 | |
| 1622 | // FP fused multiply, subtract and negate. |
| 1623 | void fnmsub(const FPRegister& fd, |
| 1624 | const FPRegister& fn, |
| 1625 | const FPRegister& fm, |
| 1626 | const FPRegister& fa); |
| 1627 | |
| 1628 | // FP divide. |
| 1629 | void fdiv(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1630 | |
| 1631 | // FP maximum. |
| 1632 | void fmax(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1633 | |
| 1634 | // FP minimum. |
| 1635 | void fmin(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1636 | |
| 1637 | // FP maximum. |
| 1638 | void fmaxnm(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1639 | |
| 1640 | // FP minimum. |
| 1641 | void fminnm(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| 1642 | |
| 1643 | // FP absolute. |
| 1644 | void fabs(const FPRegister& fd, const FPRegister& fn); |
| 1645 | |
| 1646 | // FP negate. |
| 1647 | void fneg(const FPRegister& fd, const FPRegister& fn); |
| 1648 | |
| 1649 | // FP square root. |
| 1650 | void fsqrt(const FPRegister& fd, const FPRegister& fn); |
| 1651 | |
| 1652 | // FP round to integer (nearest with ties to away). |
| 1653 | void frinta(const FPRegister& fd, const FPRegister& fn); |
| 1654 | |
| 1655 | // FP round to integer (toward minus infinity). |
| 1656 | void frintm(const FPRegister& fd, const FPRegister& fn); |
| 1657 | |
| 1658 | // FP round to integer (nearest with ties to even). |
| 1659 | void frintn(const FPRegister& fd, const FPRegister& fn); |
| 1660 | |
| 1661 | // FP round to integer (towards zero.) |
| 1662 | void frintz(const FPRegister& fd, const FPRegister& fn); |
| 1663 | |
| 1664 | // FP compare registers. |
| 1665 | void fcmp(const FPRegister& fn, const FPRegister& fm); |
| 1666 | |
| 1667 | // FP compare immediate. |
| 1668 | void fcmp(const FPRegister& fn, double value); |
| 1669 | |
| 1670 | // FP conditional compare. |
| 1671 | void fccmp(const FPRegister& fn, |
| 1672 | const FPRegister& fm, |
| 1673 | StatusFlags nzcv, |
| 1674 | Condition cond); |
| 1675 | |
| 1676 | // FP conditional select. |
| 1677 | void fcsel(const FPRegister& fd, |
| 1678 | const FPRegister& fn, |
| 1679 | const FPRegister& fm, |
| 1680 | Condition cond); |
| 1681 | |
| 1682 | // Common FP Convert function |
| 1683 | void FPConvertToInt(const Register& rd, |
| 1684 | const FPRegister& fn, |
| 1685 | FPIntegerConvertOp op); |
| 1686 | |
| 1687 | // FP convert between single and double precision. |
| 1688 | void fcvt(const FPRegister& fd, const FPRegister& fn); |
| 1689 | |
| 1690 | // Convert FP to unsigned integer (nearest with ties to away). |
| 1691 | void fcvtau(const Register& rd, const FPRegister& fn); |
| 1692 | |
| 1693 | // Convert FP to signed integer (nearest with ties to away). |
| 1694 | void fcvtas(const Register& rd, const FPRegister& fn); |
| 1695 | |
| 1696 | // Convert FP to unsigned integer (round towards -infinity). |
| 1697 | void fcvtmu(const Register& rd, const FPRegister& fn); |
| 1698 | |
| 1699 | // Convert FP to signed integer (round towards -infinity). |
| 1700 | void fcvtms(const Register& rd, const FPRegister& fn); |
| 1701 | |
| 1702 | // Convert FP to unsigned integer (nearest with ties to even). |
| 1703 | void fcvtnu(const Register& rd, const FPRegister& fn); |
| 1704 | |
| 1705 | // Convert FP to signed integer (nearest with ties to even). |
| 1706 | void fcvtns(const Register& rd, const FPRegister& fn); |
| 1707 | |
| 1708 | // Convert FP to unsigned integer (round towards zero). |
| 1709 | void fcvtzu(const Register& rd, const FPRegister& fn); |
| 1710 | |
| 1711 | // Convert FP to signed integer (rounf towards zero). |
| 1712 | void fcvtzs(const Register& rd, const FPRegister& fn); |
| 1713 | |
| 1714 | // Convert signed integer or fixed point to FP. |
| 1715 | void scvtf(const FPRegister& fd, const Register& rn, unsigned fbits = 0); |
| 1716 | |
| 1717 | // Convert unsigned integer or fixed point to FP. |
| 1718 | void ucvtf(const FPRegister& fd, const Register& rn, unsigned fbits = 0); |
| 1719 | |
| 1720 | // Instruction functions used only for test, debug, and patching. |
| 1721 | // Emit raw instructions in the instruction stream. |
| 1722 | void dci(Instr raw_inst) { Emit(raw_inst); } |
| 1723 | |
| 1724 | // Emit 8 bits of data in the instruction stream. |
| 1725 | void dc8(uint8_t data) { EmitData(&data, sizeof(data)); } |
| 1726 | |
| 1727 | // Emit 32 bits of data in the instruction stream. |
| 1728 | void dc32(uint32_t data) { EmitData(&data, sizeof(data)); } |
| 1729 | |
| 1730 | // Emit 64 bits of data in the instruction stream. |
| 1731 | void dc64(uint64_t data) { EmitData(&data, sizeof(data)); } |
| 1732 | |
| 1733 | // Copy a string into the instruction stream, including the terminating NULL |
| 1734 | // character. The instruction pointer (pc_) is then aligned correctly for |
| 1735 | // subsequent instructions. |
| 1736 | void EmitStringData(const char* string); |
| 1737 | |
| 1738 | // Pseudo-instructions ------------------------------------------------------ |
| 1739 | |
| 1740 | // Parameters are described in arm64/instructions-arm64.h. |
| 1741 | void debug(const char* message, uint32_t code, Instr params = BREAK); |
| 1742 | |
| 1743 | // Required by V8. |
| 1744 | void dd(uint32_t data) { dc32(data); } |
| 1745 | void db(uint8_t data) { dc8(data); } |
| 1746 | |
| 1747 | // Code generation helpers -------------------------------------------------- |
| 1748 | |
| 1749 | bool IsConstPoolEmpty() const { return constpool_.IsEmpty(); } |
| 1750 | |
| 1751 | Instruction* pc() const { return Instruction::Cast(pc_); } |
| 1752 | |
| 1753 | Instruction* InstructionAt(int offset) const { |
| 1754 | return reinterpret_cast<Instruction*>(buffer_ + offset); |
| 1755 | } |
| 1756 | |
| 1757 | ptrdiff_t InstructionOffset(Instruction* instr) const { |
| 1758 | return reinterpret_cast<byte*>(instr) - buffer_; |
| 1759 | } |
| 1760 | |
| 1761 | // Register encoding. |
| 1762 | static Instr Rd(CPURegister rd) { |
| 1763 | DCHECK(rd.code() != kSPRegInternalCode); |
| 1764 | return rd.code() << Rd_offset; |
| 1765 | } |
| 1766 | |
| 1767 | static Instr Rn(CPURegister rn) { |
| 1768 | DCHECK(rn.code() != kSPRegInternalCode); |
| 1769 | return rn.code() << Rn_offset; |
| 1770 | } |
| 1771 | |
| 1772 | static Instr Rm(CPURegister rm) { |
| 1773 | DCHECK(rm.code() != kSPRegInternalCode); |
| 1774 | return rm.code() << Rm_offset; |
| 1775 | } |
| 1776 | |
| 1777 | static Instr Ra(CPURegister ra) { |
| 1778 | DCHECK(ra.code() != kSPRegInternalCode); |
| 1779 | return ra.code() << Ra_offset; |
| 1780 | } |
| 1781 | |
| 1782 | static Instr Rt(CPURegister rt) { |
| 1783 | DCHECK(rt.code() != kSPRegInternalCode); |
| 1784 | return rt.code() << Rt_offset; |
| 1785 | } |
| 1786 | |
| 1787 | static Instr Rt2(CPURegister rt2) { |
| 1788 | DCHECK(rt2.code() != kSPRegInternalCode); |
| 1789 | return rt2.code() << Rt2_offset; |
| 1790 | } |
| 1791 | |
| 1792 | // These encoding functions allow the stack pointer to be encoded, and |
| 1793 | // disallow the zero register. |
| 1794 | static Instr RdSP(Register rd) { |
| 1795 | DCHECK(!rd.IsZero()); |
| 1796 | return (rd.code() & kRegCodeMask) << Rd_offset; |
| 1797 | } |
| 1798 | |
| 1799 | static Instr RnSP(Register rn) { |
| 1800 | DCHECK(!rn.IsZero()); |
| 1801 | return (rn.code() & kRegCodeMask) << Rn_offset; |
| 1802 | } |
| 1803 | |
| 1804 | // Flags encoding. |
| 1805 | inline static Instr Flags(FlagsUpdate S); |
| 1806 | inline static Instr Cond(Condition cond); |
| 1807 | |
| 1808 | // PC-relative address encoding. |
| 1809 | inline static Instr ImmPCRelAddress(int imm21); |
| 1810 | |
| 1811 | // Branch encoding. |
| 1812 | inline static Instr ImmUncondBranch(int imm26); |
| 1813 | inline static Instr ImmCondBranch(int imm19); |
| 1814 | inline static Instr ImmCmpBranch(int imm19); |
| 1815 | inline static Instr ImmTestBranch(int imm14); |
| 1816 | inline static Instr ImmTestBranchBit(unsigned bit_pos); |
| 1817 | |
| 1818 | // Data Processing encoding. |
| 1819 | inline static Instr SF(Register rd); |
| 1820 | inline static Instr ImmAddSub(int64_t imm); |
| 1821 | inline static Instr ImmS(unsigned imms, unsigned reg_size); |
| 1822 | inline static Instr ImmR(unsigned immr, unsigned reg_size); |
| 1823 | inline static Instr ImmSetBits(unsigned imms, unsigned reg_size); |
| 1824 | inline static Instr ImmRotate(unsigned immr, unsigned reg_size); |
| 1825 | inline static Instr ImmLLiteral(int imm19); |
| 1826 | inline static Instr BitN(unsigned bitn, unsigned reg_size); |
| 1827 | inline static Instr ShiftDP(Shift shift); |
| 1828 | inline static Instr ImmDPShift(unsigned amount); |
| 1829 | inline static Instr ExtendMode(Extend extend); |
| 1830 | inline static Instr ImmExtendShift(unsigned left_shift); |
| 1831 | inline static Instr ImmCondCmp(unsigned imm); |
| 1832 | inline static Instr Nzcv(StatusFlags nzcv); |
| 1833 | |
| 1834 | static bool IsImmAddSub(int64_t immediate); |
| 1835 | static bool IsImmLogical(uint64_t value, |
| 1836 | unsigned width, |
| 1837 | unsigned* n, |
| 1838 | unsigned* imm_s, |
| 1839 | unsigned* imm_r); |
| 1840 | |
| 1841 | // MemOperand offset encoding. |
| 1842 | inline static Instr ImmLSUnsigned(int imm12); |
| 1843 | inline static Instr ImmLS(int imm9); |
| 1844 | inline static Instr ImmLSPair(int imm7, LSDataSize size); |
| 1845 | inline static Instr ImmShiftLS(unsigned shift_amount); |
| 1846 | inline static Instr ImmException(int imm16); |
| 1847 | inline static Instr ImmSystemRegister(int imm15); |
| 1848 | inline static Instr ImmHint(int imm7); |
| 1849 | inline static Instr ImmBarrierDomain(int imm2); |
| 1850 | inline static Instr ImmBarrierType(int imm2); |
| 1851 | inline static LSDataSize CalcLSDataSize(LoadStoreOp op); |
| 1852 | |
| 1853 | static bool IsImmLSUnscaled(int64_t offset); |
| 1854 | static bool IsImmLSScaled(int64_t offset, LSDataSize size); |
| 1855 | |
| 1856 | // Move immediates encoding. |
| 1857 | inline static Instr ImmMoveWide(uint64_t imm); |
| 1858 | inline static Instr ShiftMoveWide(int64_t shift); |
| 1859 | |
| 1860 | // FP Immediates. |
| 1861 | static Instr ImmFP32(float imm); |
| 1862 | static Instr ImmFP64(double imm); |
| 1863 | inline static Instr FPScale(unsigned scale); |
| 1864 | |
| 1865 | // FP register type. |
| 1866 | inline static Instr FPType(FPRegister fd); |
| 1867 | |
| 1868 | // Class for scoping postponing the constant pool generation. |
| 1869 | class BlockConstPoolScope { |
| 1870 | public: |
| 1871 | explicit BlockConstPoolScope(Assembler* assem) : assem_(assem) { |
| 1872 | assem_->StartBlockConstPool(); |
| 1873 | } |
| 1874 | ~BlockConstPoolScope() { |
| 1875 | assem_->EndBlockConstPool(); |
| 1876 | } |
| 1877 | |
| 1878 | private: |
| 1879 | Assembler* assem_; |
| 1880 | |
| 1881 | DISALLOW_IMPLICIT_CONSTRUCTORS(BlockConstPoolScope); |
| 1882 | }; |
| 1883 | |
| 1884 | // Check if is time to emit a constant pool. |
| 1885 | void CheckConstPool(bool force_emit, bool require_jump); |
| 1886 | |
| 1887 | // Allocate a constant pool of the correct size for the generated code. |
| 1888 | Handle<ConstantPoolArray> NewConstantPool(Isolate* isolate); |
| 1889 | |
| 1890 | // Generate the constant pool for the generated code. |
| 1891 | void PopulateConstantPool(ConstantPoolArray* constant_pool); |
| 1892 | |
| 1893 | // Returns true if we should emit a veneer as soon as possible for a branch |
| 1894 | // which can at most reach to specified pc. |
| 1895 | bool ShouldEmitVeneer(int max_reachable_pc, |
| 1896 | int margin = kVeneerDistanceMargin); |
| 1897 | bool ShouldEmitVeneers(int margin = kVeneerDistanceMargin) { |
| 1898 | return ShouldEmitVeneer(unresolved_branches_first_limit(), margin); |
| 1899 | } |
| 1900 | |
| 1901 | // The maximum code size generated for a veneer. Currently one branch |
| 1902 | // instruction. This is for code size checking purposes, and can be extended |
| 1903 | // in the future for example if we decide to add nops between the veneers. |
| 1904 | static const int kMaxVeneerCodeSize = 1 * kInstructionSize; |
| 1905 | |
| 1906 | void RecordVeneerPool(int location_offset, int size); |
| 1907 | // Emits veneers for branches that are approaching their maximum range. |
| 1908 | // If need_protection is true, the veneers are protected by a branch jumping |
| 1909 | // over the code. |
| 1910 | void EmitVeneers(bool force_emit, bool need_protection, |
| 1911 | int margin = kVeneerDistanceMargin); |
| 1912 | void EmitVeneersGuard() { EmitPoolGuard(); } |
| 1913 | // Checks whether veneers need to be emitted at this point. |
| 1914 | // If force_emit is set, a veneer is generated for *all* unresolved branches. |
| 1915 | void CheckVeneerPool(bool force_emit, bool require_jump, |
| 1916 | int margin = kVeneerDistanceMargin); |
| 1917 | |
| 1918 | class BlockPoolsScope { |
| 1919 | public: |
| 1920 | explicit BlockPoolsScope(Assembler* assem) : assem_(assem) { |
| 1921 | assem_->StartBlockPools(); |
| 1922 | } |
| 1923 | ~BlockPoolsScope() { |
| 1924 | assem_->EndBlockPools(); |
| 1925 | } |
| 1926 | |
| 1927 | private: |
| 1928 | Assembler* assem_; |
| 1929 | |
| 1930 | DISALLOW_IMPLICIT_CONSTRUCTORS(BlockPoolsScope); |
| 1931 | }; |
| 1932 | |
| 1933 | protected: |
| 1934 | inline const Register& AppropriateZeroRegFor(const CPURegister& reg) const; |
| 1935 | |
| 1936 | void LoadStore(const CPURegister& rt, |
| 1937 | const MemOperand& addr, |
| 1938 | LoadStoreOp op); |
| 1939 | |
| 1940 | void LoadStorePair(const CPURegister& rt, const CPURegister& rt2, |
| 1941 | const MemOperand& addr, LoadStorePairOp op); |
| 1942 | static bool IsImmLSPair(int64_t offset, LSDataSize size); |
| 1943 | |
| 1944 | void Logical(const Register& rd, |
| 1945 | const Register& rn, |
| 1946 | const Operand& operand, |
| 1947 | LogicalOp op); |
| 1948 | void LogicalImmediate(const Register& rd, |
| 1949 | const Register& rn, |
| 1950 | unsigned n, |
| 1951 | unsigned imm_s, |
| 1952 | unsigned imm_r, |
| 1953 | LogicalOp op); |
| 1954 | |
| 1955 | void ConditionalCompare(const Register& rn, |
| 1956 | const Operand& operand, |
| 1957 | StatusFlags nzcv, |
| 1958 | Condition cond, |
| 1959 | ConditionalCompareOp op); |
| 1960 | static bool IsImmConditionalCompare(int64_t immediate); |
| 1961 | |
| 1962 | void AddSubWithCarry(const Register& rd, |
| 1963 | const Register& rn, |
| 1964 | const Operand& operand, |
| 1965 | FlagsUpdate S, |
| 1966 | AddSubWithCarryOp op); |
| 1967 | |
| 1968 | // Functions for emulating operands not directly supported by the instruction |
| 1969 | // set. |
| 1970 | void EmitShift(const Register& rd, |
| 1971 | const Register& rn, |
| 1972 | Shift shift, |
| 1973 | unsigned amount); |
| 1974 | void EmitExtendShift(const Register& rd, |
| 1975 | const Register& rn, |
| 1976 | Extend extend, |
| 1977 | unsigned left_shift); |
| 1978 | |
| 1979 | void AddSub(const Register& rd, |
| 1980 | const Register& rn, |
| 1981 | const Operand& operand, |
| 1982 | FlagsUpdate S, |
| 1983 | AddSubOp op); |
| 1984 | |
| 1985 | static bool IsImmFP32(float imm); |
| 1986 | static bool IsImmFP64(double imm); |
| 1987 | |
| 1988 | // Find an appropriate LoadStoreOp or LoadStorePairOp for the specified |
| 1989 | // registers. Only simple loads are supported; sign- and zero-extension (such |
| 1990 | // as in LDPSW_x or LDRB_w) are not supported. |
| 1991 | static inline LoadStoreOp LoadOpFor(const CPURegister& rt); |
| 1992 | static inline LoadStorePairOp LoadPairOpFor(const CPURegister& rt, |
| 1993 | const CPURegister& rt2); |
| 1994 | static inline LoadStoreOp StoreOpFor(const CPURegister& rt); |
| 1995 | static inline LoadStorePairOp StorePairOpFor(const CPURegister& rt, |
| 1996 | const CPURegister& rt2); |
| 1997 | static inline LoadStorePairNonTemporalOp LoadPairNonTemporalOpFor( |
| 1998 | const CPURegister& rt, const CPURegister& rt2); |
| 1999 | static inline LoadStorePairNonTemporalOp StorePairNonTemporalOpFor( |
| 2000 | const CPURegister& rt, const CPURegister& rt2); |
| 2001 | static inline LoadLiteralOp LoadLiteralOpFor(const CPURegister& rt); |
| 2002 | |
| 2003 | // Remove the specified branch from the unbound label link chain. |
| 2004 | // If available, a veneer for this label can be used for other branches in the |
| 2005 | // chain if the link chain cannot be fixed up without this branch. |
| 2006 | void RemoveBranchFromLabelLinkChain(Instruction* branch, |
| 2007 | Label* label, |
| 2008 | Instruction* label_veneer = NULL); |
| 2009 | |
| 2010 | private: |
| 2011 | // Instruction helpers. |
| 2012 | void MoveWide(const Register& rd, |
| 2013 | uint64_t imm, |
| 2014 | int shift, |
| 2015 | MoveWideImmediateOp mov_op); |
| 2016 | void DataProcShiftedRegister(const Register& rd, |
| 2017 | const Register& rn, |
| 2018 | const Operand& operand, |
| 2019 | FlagsUpdate S, |
| 2020 | Instr op); |
| 2021 | void DataProcExtendedRegister(const Register& rd, |
| 2022 | const Register& rn, |
| 2023 | const Operand& operand, |
| 2024 | FlagsUpdate S, |
| 2025 | Instr op); |
| 2026 | void LoadStorePairNonTemporal(const CPURegister& rt, |
| 2027 | const CPURegister& rt2, |
| 2028 | const MemOperand& addr, |
| 2029 | LoadStorePairNonTemporalOp op); |
| 2030 | void ConditionalSelect(const Register& rd, |
| 2031 | const Register& rn, |
| 2032 | const Register& rm, |
| 2033 | Condition cond, |
| 2034 | ConditionalSelectOp op); |
| 2035 | void DataProcessing1Source(const Register& rd, |
| 2036 | const Register& rn, |
| 2037 | DataProcessing1SourceOp op); |
| 2038 | void DataProcessing3Source(const Register& rd, |
| 2039 | const Register& rn, |
| 2040 | const Register& rm, |
| 2041 | const Register& ra, |
| 2042 | DataProcessing3SourceOp op); |
| 2043 | void FPDataProcessing1Source(const FPRegister& fd, |
| 2044 | const FPRegister& fn, |
| 2045 | FPDataProcessing1SourceOp op); |
| 2046 | void FPDataProcessing2Source(const FPRegister& fd, |
| 2047 | const FPRegister& fn, |
| 2048 | const FPRegister& fm, |
| 2049 | FPDataProcessing2SourceOp op); |
| 2050 | void FPDataProcessing3Source(const FPRegister& fd, |
| 2051 | const FPRegister& fn, |
| 2052 | const FPRegister& fm, |
| 2053 | const FPRegister& fa, |
| 2054 | FPDataProcessing3SourceOp op); |
| 2055 | |
| 2056 | // Label helpers. |
| 2057 | |
| 2058 | // Return an offset for a label-referencing instruction, typically a branch. |
| 2059 | int LinkAndGetByteOffsetTo(Label* label); |
| 2060 | |
| 2061 | // This is the same as LinkAndGetByteOffsetTo, but return an offset |
| 2062 | // suitable for fields that take instruction offsets. |
| 2063 | inline int LinkAndGetInstructionOffsetTo(Label* label); |
| 2064 | |
| 2065 | static const int kStartOfLabelLinkChain = 0; |
| 2066 | |
| 2067 | // Verify that a label's link chain is intact. |
| 2068 | void CheckLabelLinkChain(Label const * label); |
| 2069 | |
| 2070 | void RecordLiteral(int64_t imm, unsigned size); |
| 2071 | |
| 2072 | // Postpone the generation of the constant pool for the specified number of |
| 2073 | // instructions. |
| 2074 | void BlockConstPoolFor(int instructions); |
| 2075 | |
| 2076 | // Set how far from current pc the next constant pool check will be. |
| 2077 | void SetNextConstPoolCheckIn(int instructions) { |
| 2078 | next_constant_pool_check_ = pc_offset() + instructions * kInstructionSize; |
| 2079 | } |
| 2080 | |
| 2081 | // Emit the instruction at pc_. |
| 2082 | void Emit(Instr instruction) { |
| 2083 | STATIC_ASSERT(sizeof(*pc_) == 1); |
| 2084 | STATIC_ASSERT(sizeof(instruction) == kInstructionSize); |
| 2085 | DCHECK((pc_ + sizeof(instruction)) <= (buffer_ + buffer_size_)); |
| 2086 | |
| 2087 | memcpy(pc_, &instruction, sizeof(instruction)); |
| 2088 | pc_ += sizeof(instruction); |
| 2089 | CheckBuffer(); |
| 2090 | } |
| 2091 | |
| 2092 | // Emit data inline in the instruction stream. |
| 2093 | void EmitData(void const * data, unsigned size) { |
| 2094 | DCHECK(sizeof(*pc_) == 1); |
| 2095 | DCHECK((pc_ + size) <= (buffer_ + buffer_size_)); |
| 2096 | |
| 2097 | // TODO(all): Somehow register we have some data here. Then we can |
| 2098 | // disassemble it correctly. |
| 2099 | memcpy(pc_, data, size); |
| 2100 | pc_ += size; |
| 2101 | CheckBuffer(); |
| 2102 | } |
| 2103 | |
| 2104 | void GrowBuffer(); |
| 2105 | void CheckBufferSpace(); |
| 2106 | void CheckBuffer(); |
| 2107 | |
| 2108 | // Pc offset of the next constant pool check. |
| 2109 | int next_constant_pool_check_; |
| 2110 | |
| 2111 | // Constant pool generation |
| 2112 | // Pools are emitted in the instruction stream. They are emitted when: |
| 2113 | // * the distance to the first use is above a pre-defined distance or |
| 2114 | // * the numbers of entries in the pool is above a pre-defined size or |
| 2115 | // * code generation is finished |
| 2116 | // If a pool needs to be emitted before code generation is finished a branch |
| 2117 | // over the emitted pool will be inserted. |
| 2118 | |
| 2119 | // Constants in the pool may be addresses of functions that gets relocated; |
| 2120 | // if so, a relocation info entry is associated to the constant pool entry. |
| 2121 | |
| 2122 | // Repeated checking whether the constant pool should be emitted is rather |
| 2123 | // expensive. By default we only check again once a number of instructions |
| 2124 | // has been generated. That also means that the sizing of the buffers is not |
| 2125 | // an exact science, and that we rely on some slop to not overrun buffers. |
| 2126 | static const int kCheckConstPoolInterval = 128; |
| 2127 | |
| 2128 | // Distance to first use after a which a pool will be emitted. Pool entries |
| 2129 | // are accessed with pc relative load therefore this cannot be more than |
| 2130 | // 1 * MB. Since constant pool emission checks are interval based this value |
| 2131 | // is an approximation. |
| 2132 | static const int kApproxMaxDistToConstPool = 64 * KB; |
| 2133 | |
| 2134 | // Number of pool entries after which a pool will be emitted. Since constant |
| 2135 | // pool emission checks are interval based this value is an approximation. |
| 2136 | static const int kApproxMaxPoolEntryCount = 512; |
| 2137 | |
| 2138 | // Emission of the constant pool may be blocked in some code sequences. |
| 2139 | int const_pool_blocked_nesting_; // Block emission if this is not zero. |
| 2140 | int no_const_pool_before_; // Block emission before this pc offset. |
| 2141 | |
| 2142 | // Emission of the veneer pools may be blocked in some code sequences. |
| 2143 | int veneer_pool_blocked_nesting_; // Block emission if this is not zero. |
| 2144 | |
| 2145 | // Relocation info generation |
| 2146 | // Each relocation is encoded as a variable size value |
| 2147 | static const int kMaxRelocSize = RelocInfoWriter::kMaxSize; |
| 2148 | RelocInfoWriter reloc_info_writer; |
| 2149 | |
| 2150 | // Relocation info records are also used during code generation as temporary |
| 2151 | // containers for constants and code target addresses until they are emitted |
| 2152 | // to the constant pool. These pending relocation info records are temporarily |
| 2153 | // stored in a separate buffer until a constant pool is emitted. |
| 2154 | // If every instruction in a long sequence is accessing the pool, we need one |
| 2155 | // pending relocation entry per instruction. |
| 2156 | |
| 2157 | // The pending constant pool. |
| 2158 | ConstPool constpool_; |
| 2159 | |
| 2160 | // Relocation for a type-recording IC has the AST id added to it. This |
| 2161 | // member variable is a way to pass the information from the call site to |
| 2162 | // the relocation info. |
| 2163 | TypeFeedbackId recorded_ast_id_; |
| 2164 | |
| 2165 | inline TypeFeedbackId RecordedAstId(); |
| 2166 | inline void ClearRecordedAstId(); |
| 2167 | |
| 2168 | protected: |
| 2169 | // Record the AST id of the CallIC being compiled, so that it can be placed |
| 2170 | // in the relocation information. |
| 2171 | void SetRecordedAstId(TypeFeedbackId ast_id) { |
| 2172 | DCHECK(recorded_ast_id_.IsNone()); |
| 2173 | recorded_ast_id_ = ast_id; |
| 2174 | } |
| 2175 | |
| 2176 | // Code generation |
| 2177 | // The relocation writer's position is at least kGap bytes below the end of |
| 2178 | // the generated instructions. This is so that multi-instruction sequences do |
| 2179 | // not have to check for overflow. The same is true for writes of large |
| 2180 | // relocation info entries, and debug strings encoded in the instruction |
| 2181 | // stream. |
| 2182 | static const int kGap = 128; |
| 2183 | |
| 2184 | public: |
| 2185 | class FarBranchInfo { |
| 2186 | public: |
| 2187 | FarBranchInfo(int offset, Label* label) |
| 2188 | : pc_offset_(offset), label_(label) {} |
| 2189 | // Offset of the branch in the code generation buffer. |
| 2190 | int pc_offset_; |
| 2191 | // The label branched to. |
| 2192 | Label* label_; |
| 2193 | }; |
| 2194 | |
| 2195 | protected: |
| 2196 | // Information about unresolved (forward) branches. |
| 2197 | // The Assembler is only allowed to delete out-of-date information from here |
| 2198 | // after a label is bound. The MacroAssembler uses this information to |
| 2199 | // generate veneers. |
| 2200 | // |
| 2201 | // The second member gives information about the unresolved branch. The first |
| 2202 | // member of the pair is the maximum offset that the branch can reach in the |
| 2203 | // buffer. The map is sorted according to this reachable offset, allowing to |
| 2204 | // easily check when veneers need to be emitted. |
| 2205 | // Note that the maximum reachable offset (first member of the pairs) should |
| 2206 | // always be positive but has the same type as the return value for |
| 2207 | // pc_offset() for convenience. |
| 2208 | std::multimap<int, FarBranchInfo> unresolved_branches_; |
| 2209 | |
| 2210 | // We generate a veneer for a branch if we reach within this distance of the |
| 2211 | // limit of the range. |
| 2212 | static const int kVeneerDistanceMargin = 1 * KB; |
| 2213 | // The factor of 2 is a finger in the air guess. With a default margin of |
| 2214 | // 1KB, that leaves us an addional 256 instructions to avoid generating a |
| 2215 | // protective branch. |
| 2216 | static const int kVeneerNoProtectionFactor = 2; |
| 2217 | static const int kVeneerDistanceCheckMargin = |
| 2218 | kVeneerNoProtectionFactor * kVeneerDistanceMargin; |
| 2219 | int unresolved_branches_first_limit() const { |
| 2220 | DCHECK(!unresolved_branches_.empty()); |
| 2221 | return unresolved_branches_.begin()->first; |
| 2222 | } |
| 2223 | // This is similar to next_constant_pool_check_ and helps reduce the overhead |
| 2224 | // of checking for veneer pools. |
| 2225 | // It is maintained to the closest unresolved branch limit minus the maximum |
| 2226 | // veneer margin (or kMaxInt if there are no unresolved branches). |
| 2227 | int next_veneer_pool_check_; |
| 2228 | |
| 2229 | private: |
| 2230 | // If a veneer is emitted for a branch instruction, that instruction must be |
| 2231 | // removed from the associated label's link chain so that the assembler does |
| 2232 | // not later attempt (likely unsuccessfully) to patch it to branch directly to |
| 2233 | // the label. |
| 2234 | void DeleteUnresolvedBranchInfoForLabel(Label* label); |
| 2235 | // This function deletes the information related to the label by traversing |
| 2236 | // the label chain, and for each PC-relative instruction in the chain checking |
| 2237 | // if pending unresolved information exists. Its complexity is proportional to |
| 2238 | // the length of the label chain. |
| 2239 | void DeleteUnresolvedBranchInfoForLabelTraverse(Label* label); |
| 2240 | |
| 2241 | private: |
| 2242 | PositionsRecorder positions_recorder_; |
| 2243 | friend class PositionsRecorder; |
| 2244 | friend class EnsureSpace; |
| 2245 | friend class ConstPool; |
| 2246 | }; |
| 2247 | |
| 2248 | class PatchingAssembler : public Assembler { |
| 2249 | public: |
| 2250 | // Create an Assembler with a buffer starting at 'start'. |
| 2251 | // The buffer size is |
| 2252 | // size of instructions to patch + kGap |
| 2253 | // Where kGap is the distance from which the Assembler tries to grow the |
| 2254 | // buffer. |
| 2255 | // If more or fewer instructions than expected are generated or if some |
| 2256 | // relocation information takes space in the buffer, the PatchingAssembler |
| 2257 | // will crash trying to grow the buffer. |
| 2258 | PatchingAssembler(Instruction* start, unsigned count) |
| 2259 | : Assembler(NULL, |
| 2260 | reinterpret_cast<byte*>(start), |
| 2261 | count * kInstructionSize + kGap) { |
| 2262 | StartBlockPools(); |
| 2263 | } |
| 2264 | |
| 2265 | PatchingAssembler(byte* start, unsigned count) |
| 2266 | : Assembler(NULL, start, count * kInstructionSize + kGap) { |
| 2267 | // Block constant pool emission. |
| 2268 | StartBlockPools(); |
| 2269 | } |
| 2270 | |
| 2271 | ~PatchingAssembler() { |
| 2272 | // Const pool should still be blocked. |
| 2273 | DCHECK(is_const_pool_blocked()); |
| 2274 | EndBlockPools(); |
| 2275 | // Verify we have generated the number of instruction we expected. |
| 2276 | DCHECK((pc_offset() + kGap) == buffer_size_); |
| 2277 | // Verify no relocation information has been emitted. |
| 2278 | DCHECK(IsConstPoolEmpty()); |
| 2279 | // Flush the Instruction cache. |
| 2280 | size_t length = buffer_size_ - kGap; |
| 2281 | CpuFeatures::FlushICache(buffer_, length); |
| 2282 | } |
| 2283 | |
| 2284 | // See definition of PatchAdrFar() for details. |
| 2285 | static const int kAdrFarPatchableNNops = 2; |
| 2286 | static const int kAdrFarPatchableNInstrs = kAdrFarPatchableNNops + 2; |
| 2287 | void PatchAdrFar(int64_t target_offset); |
| 2288 | }; |
| 2289 | |
| 2290 | |
| 2291 | class EnsureSpace BASE_EMBEDDED { |
| 2292 | public: |
| 2293 | explicit EnsureSpace(Assembler* assembler) { |
| 2294 | assembler->CheckBufferSpace(); |
| 2295 | } |
| 2296 | }; |
| 2297 | |
| 2298 | } } // namespace v8::internal |
| 2299 | |
| 2300 | #endif // V8_ARM64_ASSEMBLER_ARM64_H_ |