1 //===- MCExpr.h - Assembly Level Expressions --------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_MC_MCEXPR_H 10 #define LLVM_MC_MCEXPR_H 11 12 #include "llvm/ADT/DenseMap.h" 13 #include "llvm/Support/SMLoc.h" 14 #include <cstdint> 15 16 namespace llvm { 17 18 class MCAsmInfo; 19 class MCAsmLayout; 20 class MCAssembler; 21 class MCContext; 22 class MCFixup; 23 class MCFragment; 24 class MCSection; 25 class MCStreamer; 26 class MCSymbol; 27 class MCValue; 28 class raw_ostream; 29 class StringRef; 30 31 using SectionAddrMap = DenseMap<const MCSection *, uint64_t>; 32 33 /// Base class for the full range of assembler expressions which are 34 /// needed for parsing. 35 class MCExpr { 36 public: 37 enum ExprKind : uint8_t { 38 Binary, ///< Binary expressions. 39 Constant, ///< Constant expressions. 40 SymbolRef, ///< References to labels and assigned expressions. 41 Unary, ///< Unary expressions. 42 Target ///< Target specific expression. 43 }; 44 45 private: 46 static const unsigned NumSubclassDataBits = 24; 47 static_assert( 48 NumSubclassDataBits == CHAR_BIT * (sizeof(unsigned) - sizeof(ExprKind)), 49 "ExprKind and SubclassData together should take up one word"); 50 51 ExprKind Kind; 52 /// Field reserved for use by MCExpr subclasses. 53 unsigned SubclassData : NumSubclassDataBits; 54 SMLoc Loc; 55 56 bool evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm, 57 const MCAsmLayout *Layout, 58 const SectionAddrMap *Addrs, bool InSet) const; 59 60 protected: 61 explicit MCExpr(ExprKind Kind, SMLoc Loc, unsigned SubclassData = 0) 62 : Kind(Kind), SubclassData(SubclassData), Loc(Loc) { 63 assert(SubclassData < (1 << NumSubclassDataBits) && 64 "Subclass data too large"); 65 } 66 67 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAssembler *Asm, 68 const MCAsmLayout *Layout, 69 const MCFixup *Fixup, 70 const SectionAddrMap *Addrs, bool InSet) const; 71 72 unsigned getSubclassData() const { return SubclassData; } 73 74 public: 75 MCExpr(const MCExpr &) = delete; 76 MCExpr &operator=(const MCExpr &) = delete; 77 78 /// \name Accessors 79 /// @{ 80 81 ExprKind getKind() const { return Kind; } 82 SMLoc getLoc() const { return Loc; } 83 84 /// @} 85 /// \name Utility Methods 86 /// @{ 87 88 void print(raw_ostream &OS, const MCAsmInfo *MAI, 89 bool InParens = false) const; 90 void dump() const; 91 92 /// @} 93 /// \name Expression Evaluation 94 /// @{ 95 96 /// Try to evaluate the expression to an absolute value. 97 /// 98 /// \param Res - The absolute value, if evaluation succeeds. 99 /// \param Layout - The assembler layout object to use for evaluating symbol 100 /// values. If not given, then only non-symbolic expressions will be 101 /// evaluated. 102 /// \return - True on success. 103 bool evaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout, 104 const SectionAddrMap &Addrs) const; 105 bool evaluateAsAbsolute(int64_t &Res) const; 106 bool evaluateAsAbsolute(int64_t &Res, const MCAssembler &Asm) const; 107 bool evaluateAsAbsolute(int64_t &Res, const MCAssembler *Asm) const; 108 bool evaluateAsAbsolute(int64_t &Res, const MCAsmLayout &Layout) const; 109 110 bool evaluateKnownAbsolute(int64_t &Res, const MCAsmLayout &Layout) const; 111 112 /// Try to evaluate the expression to a relocatable value, i.e. an 113 /// expression of the fixed form (a - b + constant). 114 /// 115 /// \param Res - The relocatable value, if evaluation succeeds. 116 /// \param Layout - The assembler layout object to use for evaluating values. 117 /// \param Fixup - The Fixup object if available. 118 /// \return - True on success. 119 bool evaluateAsRelocatable(MCValue &Res, const MCAsmLayout *Layout, 120 const MCFixup *Fixup) const; 121 122 /// Try to evaluate the expression to the form (a - b + constant) where 123 /// neither a nor b are variables. 124 /// 125 /// This is a more aggressive variant of evaluateAsRelocatable. The intended 126 /// use is for when relocations are not available, like the .size directive. 127 bool evaluateAsValue(MCValue &Res, const MCAsmLayout &Layout) const; 128 129 /// Find the "associated section" for this expression, which is 130 /// currently defined as the absolute section for constants, or 131 /// otherwise the section associated with the first defined symbol in the 132 /// expression. 133 MCFragment *findAssociatedFragment() const; 134 135 /// @} 136 }; 137 138 inline raw_ostream &operator<<(raw_ostream &OS, const MCExpr &E) { 139 E.print(OS, nullptr); 140 return OS; 141 } 142 143 //// Represent a constant integer expression. 144 class MCConstantExpr : public MCExpr { 145 int64_t Value; 146 147 // Subclass data stores SizeInBytes in bits 0..7 and PrintInHex in bit 8. 148 static const unsigned SizeInBytesBits = 8; 149 static const unsigned SizeInBytesMask = (1 << SizeInBytesBits) - 1; 150 static const unsigned PrintInHexBit = 1 << SizeInBytesBits; 151 152 static unsigned encodeSubclassData(bool PrintInHex, unsigned SizeInBytes) { 153 assert(SizeInBytes <= sizeof(int64_t) && "Excessive size"); 154 return SizeInBytes | (PrintInHex ? PrintInHexBit : 0); 155 } 156 157 MCConstantExpr(int64_t Value, bool PrintInHex, unsigned SizeInBytes) 158 : MCExpr(MCExpr::Constant, SMLoc(), 159 encodeSubclassData(PrintInHex, SizeInBytes)), Value(Value) {} 160 161 public: 162 /// \name Construction 163 /// @{ 164 165 static const MCConstantExpr *create(int64_t Value, MCContext &Ctx, 166 bool PrintInHex = false, 167 unsigned SizeInBytes = 0); 168 169 /// @} 170 /// \name Accessors 171 /// @{ 172 173 int64_t getValue() const { return Value; } 174 unsigned getSizeInBytes() const { 175 return getSubclassData() & SizeInBytesMask; 176 } 177 178 bool useHexFormat() const { return (getSubclassData() & PrintInHexBit) != 0; } 179 180 /// @} 181 182 static bool classof(const MCExpr *E) { 183 return E->getKind() == MCExpr::Constant; 184 } 185 }; 186 187 /// Represent a reference to a symbol from inside an expression. 188 /// 189 /// A symbol reference in an expression may be a use of a label, a use of an 190 /// assembler variable (defined constant), or constitute an implicit definition 191 /// of the symbol as external. 192 class MCSymbolRefExpr : public MCExpr { 193 public: 194 enum VariantKind : uint16_t { 195 VK_None, 196 VK_Invalid, 197 198 VK_GOT, 199 VK_GOTOFF, 200 VK_GOTREL, 201 VK_PCREL, 202 VK_GOTPCREL, 203 VK_GOTPCREL_NORELAX, 204 VK_GOTTPOFF, 205 VK_INDNTPOFF, 206 VK_NTPOFF, 207 VK_GOTNTPOFF, 208 VK_PLT, 209 VK_TLSGD, 210 VK_TLSLD, 211 VK_TLSLDM, 212 VK_TPOFF, 213 VK_DTPOFF, 214 VK_TLSCALL, // symbol(tlscall) 215 VK_TLSDESC, // symbol(tlsdesc) 216 VK_TLVP, // Mach-O thread local variable relocations 217 VK_TLVPPAGE, 218 VK_TLVPPAGEOFF, 219 VK_PAGE, 220 VK_PAGEOFF, 221 VK_GOTPAGE, 222 VK_GOTPAGEOFF, 223 VK_SECREL, 224 VK_SIZE, // symbol@SIZE 225 VK_WEAKREF, // The link between the symbols in .weakref foo, bar 226 227 VK_X86_ABS8, 228 VK_X86_PLTOFF, 229 230 VK_ARM_NONE, 231 VK_ARM_GOT_PREL, 232 VK_ARM_TARGET1, 233 VK_ARM_TARGET2, 234 VK_ARM_PREL31, 235 VK_ARM_SBREL, // symbol(sbrel) 236 VK_ARM_TLSLDO, // symbol(tlsldo) 237 VK_ARM_TLSDESCSEQ, 238 239 VK_AVR_NONE, 240 VK_AVR_LO8, 241 VK_AVR_HI8, 242 VK_AVR_HLO8, 243 VK_AVR_DIFF8, 244 VK_AVR_DIFF16, 245 VK_AVR_DIFF32, 246 VK_AVR_PM, 247 248 VK_PPC_LO, // symbol@l 249 VK_PPC_HI, // symbol@h 250 VK_PPC_HA, // symbol@ha 251 VK_PPC_HIGH, // symbol@high 252 VK_PPC_HIGHA, // symbol@higha 253 VK_PPC_HIGHER, // symbol@higher 254 VK_PPC_HIGHERA, // symbol@highera 255 VK_PPC_HIGHEST, // symbol@highest 256 VK_PPC_HIGHESTA, // symbol@highesta 257 VK_PPC_GOT_LO, // symbol@got@l 258 VK_PPC_GOT_HI, // symbol@got@h 259 VK_PPC_GOT_HA, // symbol@got@ha 260 VK_PPC_TOCBASE, // symbol@tocbase 261 VK_PPC_TOC, // symbol@toc 262 VK_PPC_TOC_LO, // symbol@toc@l 263 VK_PPC_TOC_HI, // symbol@toc@h 264 VK_PPC_TOC_HA, // symbol@toc@ha 265 VK_PPC_U, // symbol@u 266 VK_PPC_L, // symbol@l 267 VK_PPC_DTPMOD, // symbol@dtpmod 268 VK_PPC_TPREL_LO, // symbol@tprel@l 269 VK_PPC_TPREL_HI, // symbol@tprel@h 270 VK_PPC_TPREL_HA, // symbol@tprel@ha 271 VK_PPC_TPREL_HIGH, // symbol@tprel@high 272 VK_PPC_TPREL_HIGHA, // symbol@tprel@higha 273 VK_PPC_TPREL_HIGHER, // symbol@tprel@higher 274 VK_PPC_TPREL_HIGHERA, // symbol@tprel@highera 275 VK_PPC_TPREL_HIGHEST, // symbol@tprel@highest 276 VK_PPC_TPREL_HIGHESTA, // symbol@tprel@highesta 277 VK_PPC_DTPREL_LO, // symbol@dtprel@l 278 VK_PPC_DTPREL_HI, // symbol@dtprel@h 279 VK_PPC_DTPREL_HA, // symbol@dtprel@ha 280 VK_PPC_DTPREL_HIGH, // symbol@dtprel@high 281 VK_PPC_DTPREL_HIGHA, // symbol@dtprel@higha 282 VK_PPC_DTPREL_HIGHER, // symbol@dtprel@higher 283 VK_PPC_DTPREL_HIGHERA, // symbol@dtprel@highera 284 VK_PPC_DTPREL_HIGHEST, // symbol@dtprel@highest 285 VK_PPC_DTPREL_HIGHESTA, // symbol@dtprel@highesta 286 VK_PPC_GOT_TPREL, // symbol@got@tprel 287 VK_PPC_GOT_TPREL_LO, // symbol@got@tprel@l 288 VK_PPC_GOT_TPREL_HI, // symbol@got@tprel@h 289 VK_PPC_GOT_TPREL_HA, // symbol@got@tprel@ha 290 VK_PPC_GOT_DTPREL, // symbol@got@dtprel 291 VK_PPC_GOT_DTPREL_LO, // symbol@got@dtprel@l 292 VK_PPC_GOT_DTPREL_HI, // symbol@got@dtprel@h 293 VK_PPC_GOT_DTPREL_HA, // symbol@got@dtprel@ha 294 VK_PPC_TLS, // symbol@tls 295 VK_PPC_GOT_TLSGD, // symbol@got@tlsgd 296 VK_PPC_GOT_TLSGD_LO, // symbol@got@tlsgd@l 297 VK_PPC_GOT_TLSGD_HI, // symbol@got@tlsgd@h 298 VK_PPC_GOT_TLSGD_HA, // symbol@got@tlsgd@ha 299 VK_PPC_TLSGD, // symbol@tlsgd 300 VK_PPC_AIX_TLSGD, // symbol@gd 301 VK_PPC_AIX_TLSGDM, // symbol@m 302 VK_PPC_AIX_TLSLE, // symbol@le 303 VK_PPC_GOT_TLSLD, // symbol@got@tlsld 304 VK_PPC_GOT_TLSLD_LO, // symbol@got@tlsld@l 305 VK_PPC_GOT_TLSLD_HI, // symbol@got@tlsld@h 306 VK_PPC_GOT_TLSLD_HA, // symbol@got@tlsld@ha 307 VK_PPC_GOT_PCREL, // symbol@got@pcrel 308 VK_PPC_GOT_TLSGD_PCREL, // symbol@got@tlsgd@pcrel 309 VK_PPC_GOT_TLSLD_PCREL, // symbol@got@tlsld@pcrel 310 VK_PPC_GOT_TPREL_PCREL, // symbol@got@tprel@pcrel 311 VK_PPC_TLS_PCREL, // symbol@tls@pcrel 312 VK_PPC_TLSLD, // symbol@tlsld 313 VK_PPC_LOCAL, // symbol@local 314 VK_PPC_NOTOC, // symbol@notoc 315 VK_PPC_PCREL_OPT, // .reloc expr, R_PPC64_PCREL_OPT, expr 316 317 VK_COFF_IMGREL32, // symbol@imgrel (image-relative) 318 319 VK_Hexagon_LO16, 320 VK_Hexagon_HI16, 321 VK_Hexagon_GPREL, 322 VK_Hexagon_GD_GOT, 323 VK_Hexagon_LD_GOT, 324 VK_Hexagon_GD_PLT, 325 VK_Hexagon_LD_PLT, 326 VK_Hexagon_IE, 327 VK_Hexagon_IE_GOT, 328 329 VK_WASM_TYPEINDEX, // Reference to a symbol's type (signature) 330 VK_WASM_TLSREL, // Memory address relative to __tls_base 331 VK_WASM_MBREL, // Memory address relative to __memory_base 332 VK_WASM_TBREL, // Table index relative to __table_base 333 VK_WASM_GOT_TLS, // Wasm global index of TLS symbol. 334 VK_WASM_FUNCINDEX, // Wasm function index. 335 336 VK_AMDGPU_GOTPCREL32_LO, // symbol@gotpcrel32@lo 337 VK_AMDGPU_GOTPCREL32_HI, // symbol@gotpcrel32@hi 338 VK_AMDGPU_REL32_LO, // symbol@rel32@lo 339 VK_AMDGPU_REL32_HI, // symbol@rel32@hi 340 VK_AMDGPU_REL64, // symbol@rel64 341 VK_AMDGPU_ABS32_LO, // symbol@abs32@lo 342 VK_AMDGPU_ABS32_HI, // symbol@abs32@hi 343 344 VK_VE_HI32, // symbol@hi 345 VK_VE_LO32, // symbol@lo 346 VK_VE_PC_HI32, // symbol@pc_hi 347 VK_VE_PC_LO32, // symbol@pc_lo 348 VK_VE_GOT_HI32, // symbol@got_hi 349 VK_VE_GOT_LO32, // symbol@got_lo 350 VK_VE_GOTOFF_HI32, // symbol@gotoff_hi 351 VK_VE_GOTOFF_LO32, // symbol@gotoff_lo 352 VK_VE_PLT_HI32, // symbol@plt_hi 353 VK_VE_PLT_LO32, // symbol@plt_lo 354 VK_VE_TLS_GD_HI32, // symbol@tls_gd_hi 355 VK_VE_TLS_GD_LO32, // symbol@tls_gd_lo 356 VK_VE_TPOFF_HI32, // symbol@tpoff_hi 357 VK_VE_TPOFF_LO32, // symbol@tpoff_lo 358 359 VK_TPREL, 360 VK_DTPREL 361 }; 362 363 private: 364 /// The symbol being referenced. 365 const MCSymbol *Symbol; 366 367 // Subclass data stores VariantKind in bits 0..15 and HasSubsectionsViaSymbols 368 // in bit 16. 369 static const unsigned VariantKindBits = 16; 370 static const unsigned VariantKindMask = (1 << VariantKindBits) - 1; 371 372 // FIXME: Remove this bit. 373 static const unsigned HasSubsectionsViaSymbolsBit = 1 << VariantKindBits; 374 375 static unsigned encodeSubclassData(VariantKind Kind, 376 bool HasSubsectionsViaSymbols) { 377 return (unsigned)Kind | 378 (HasSubsectionsViaSymbols ? HasSubsectionsViaSymbolsBit : 0); 379 } 380 381 explicit MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind, 382 const MCAsmInfo *MAI, SMLoc Loc = SMLoc()); 383 384 public: 385 /// \name Construction 386 /// @{ 387 388 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, MCContext &Ctx) { 389 return MCSymbolRefExpr::create(Symbol, VK_None, Ctx); 390 } 391 392 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, VariantKind Kind, 393 MCContext &Ctx, SMLoc Loc = SMLoc()); 394 static const MCSymbolRefExpr *create(StringRef Name, VariantKind Kind, 395 MCContext &Ctx); 396 397 /// @} 398 /// \name Accessors 399 /// @{ 400 401 const MCSymbol &getSymbol() const { return *Symbol; } 402 403 VariantKind getKind() const { 404 return (VariantKind)(getSubclassData() & VariantKindMask); 405 } 406 407 bool hasSubsectionsViaSymbols() const { 408 return (getSubclassData() & HasSubsectionsViaSymbolsBit) != 0; 409 } 410 411 /// @} 412 /// \name Static Utility Functions 413 /// @{ 414 415 static StringRef getVariantKindName(VariantKind Kind); 416 417 static VariantKind getVariantKindForName(StringRef Name); 418 419 /// @} 420 421 static bool classof(const MCExpr *E) { 422 return E->getKind() == MCExpr::SymbolRef; 423 } 424 }; 425 426 /// Unary assembler expressions. 427 class MCUnaryExpr : public MCExpr { 428 public: 429 enum Opcode { 430 LNot, ///< Logical negation. 431 Minus, ///< Unary minus. 432 Not, ///< Bitwise negation. 433 Plus ///< Unary plus. 434 }; 435 436 private: 437 const MCExpr *Expr; 438 439 MCUnaryExpr(Opcode Op, const MCExpr *Expr, SMLoc Loc) 440 : MCExpr(MCExpr::Unary, Loc, Op), Expr(Expr) {} 441 442 public: 443 /// \name Construction 444 /// @{ 445 446 static const MCUnaryExpr *create(Opcode Op, const MCExpr *Expr, 447 MCContext &Ctx, SMLoc Loc = SMLoc()); 448 449 static const MCUnaryExpr *createLNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 450 return create(LNot, Expr, Ctx, Loc); 451 } 452 453 static const MCUnaryExpr *createMinus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 454 return create(Minus, Expr, Ctx, Loc); 455 } 456 457 static const MCUnaryExpr *createNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 458 return create(Not, Expr, Ctx, Loc); 459 } 460 461 static const MCUnaryExpr *createPlus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 462 return create(Plus, Expr, Ctx, Loc); 463 } 464 465 /// @} 466 /// \name Accessors 467 /// @{ 468 469 /// Get the kind of this unary expression. 470 Opcode getOpcode() const { return (Opcode)getSubclassData(); } 471 472 /// Get the child of this unary expression. 473 const MCExpr *getSubExpr() const { return Expr; } 474 475 /// @} 476 477 static bool classof(const MCExpr *E) { 478 return E->getKind() == MCExpr::Unary; 479 } 480 }; 481 482 /// Binary assembler expressions. 483 class MCBinaryExpr : public MCExpr { 484 public: 485 enum Opcode { 486 Add, ///< Addition. 487 And, ///< Bitwise and. 488 Div, ///< Signed division. 489 EQ, ///< Equality comparison. 490 GT, ///< Signed greater than comparison (result is either 0 or some 491 ///< target-specific non-zero value) 492 GTE, ///< Signed greater than or equal comparison (result is either 0 or 493 ///< some target-specific non-zero value). 494 LAnd, ///< Logical and. 495 LOr, ///< Logical or. 496 LT, ///< Signed less than comparison (result is either 0 or 497 ///< some target-specific non-zero value). 498 LTE, ///< Signed less than or equal comparison (result is either 0 or 499 ///< some target-specific non-zero value). 500 Mod, ///< Signed remainder. 501 Mul, ///< Multiplication. 502 NE, ///< Inequality comparison. 503 Or, ///< Bitwise or. 504 OrNot, ///< Bitwise or not. 505 Shl, ///< Shift left. 506 AShr, ///< Arithmetic shift right. 507 LShr, ///< Logical shift right. 508 Sub, ///< Subtraction. 509 Xor ///< Bitwise exclusive or. 510 }; 511 512 private: 513 const MCExpr *LHS, *RHS; 514 515 MCBinaryExpr(Opcode Op, const MCExpr *LHS, const MCExpr *RHS, 516 SMLoc Loc = SMLoc()) 517 : MCExpr(MCExpr::Binary, Loc, Op), LHS(LHS), RHS(RHS) {} 518 519 public: 520 /// \name Construction 521 /// @{ 522 523 static const MCBinaryExpr *create(Opcode Op, const MCExpr *LHS, 524 const MCExpr *RHS, MCContext &Ctx, 525 SMLoc Loc = SMLoc()); 526 527 static const MCBinaryExpr *createAdd(const MCExpr *LHS, const MCExpr *RHS, 528 MCContext &Ctx) { 529 return create(Add, LHS, RHS, Ctx); 530 } 531 532 static const MCBinaryExpr *createAnd(const MCExpr *LHS, const MCExpr *RHS, 533 MCContext &Ctx) { 534 return create(And, LHS, RHS, Ctx); 535 } 536 537 static const MCBinaryExpr *createDiv(const MCExpr *LHS, const MCExpr *RHS, 538 MCContext &Ctx) { 539 return create(Div, LHS, RHS, Ctx); 540 } 541 542 static const MCBinaryExpr *createEQ(const MCExpr *LHS, const MCExpr *RHS, 543 MCContext &Ctx) { 544 return create(EQ, LHS, RHS, Ctx); 545 } 546 547 static const MCBinaryExpr *createGT(const MCExpr *LHS, const MCExpr *RHS, 548 MCContext &Ctx) { 549 return create(GT, LHS, RHS, Ctx); 550 } 551 552 static const MCBinaryExpr *createGTE(const MCExpr *LHS, const MCExpr *RHS, 553 MCContext &Ctx) { 554 return create(GTE, LHS, RHS, Ctx); 555 } 556 557 static const MCBinaryExpr *createLAnd(const MCExpr *LHS, const MCExpr *RHS, 558 MCContext &Ctx) { 559 return create(LAnd, LHS, RHS, Ctx); 560 } 561 562 static const MCBinaryExpr *createLOr(const MCExpr *LHS, const MCExpr *RHS, 563 MCContext &Ctx) { 564 return create(LOr, LHS, RHS, Ctx); 565 } 566 567 static const MCBinaryExpr *createLT(const MCExpr *LHS, const MCExpr *RHS, 568 MCContext &Ctx) { 569 return create(LT, LHS, RHS, Ctx); 570 } 571 572 static const MCBinaryExpr *createLTE(const MCExpr *LHS, const MCExpr *RHS, 573 MCContext &Ctx) { 574 return create(LTE, LHS, RHS, Ctx); 575 } 576 577 static const MCBinaryExpr *createMod(const MCExpr *LHS, const MCExpr *RHS, 578 MCContext &Ctx) { 579 return create(Mod, LHS, RHS, Ctx); 580 } 581 582 static const MCBinaryExpr *createMul(const MCExpr *LHS, const MCExpr *RHS, 583 MCContext &Ctx) { 584 return create(Mul, LHS, RHS, Ctx); 585 } 586 587 static const MCBinaryExpr *createNE(const MCExpr *LHS, const MCExpr *RHS, 588 MCContext &Ctx) { 589 return create(NE, LHS, RHS, Ctx); 590 } 591 592 static const MCBinaryExpr *createOr(const MCExpr *LHS, const MCExpr *RHS, 593 MCContext &Ctx) { 594 return create(Or, LHS, RHS, Ctx); 595 } 596 597 static const MCBinaryExpr *createShl(const MCExpr *LHS, const MCExpr *RHS, 598 MCContext &Ctx) { 599 return create(Shl, LHS, RHS, Ctx); 600 } 601 602 static const MCBinaryExpr *createAShr(const MCExpr *LHS, const MCExpr *RHS, 603 MCContext &Ctx) { 604 return create(AShr, LHS, RHS, Ctx); 605 } 606 607 static const MCBinaryExpr *createLShr(const MCExpr *LHS, const MCExpr *RHS, 608 MCContext &Ctx) { 609 return create(LShr, LHS, RHS, Ctx); 610 } 611 612 static const MCBinaryExpr *createSub(const MCExpr *LHS, const MCExpr *RHS, 613 MCContext &Ctx) { 614 return create(Sub, LHS, RHS, Ctx); 615 } 616 617 static const MCBinaryExpr *createXor(const MCExpr *LHS, const MCExpr *RHS, 618 MCContext &Ctx) { 619 return create(Xor, LHS, RHS, Ctx); 620 } 621 622 /// @} 623 /// \name Accessors 624 /// @{ 625 626 /// Get the kind of this binary expression. 627 Opcode getOpcode() const { return (Opcode)getSubclassData(); } 628 629 /// Get the left-hand side expression of the binary operator. 630 const MCExpr *getLHS() const { return LHS; } 631 632 /// Get the right-hand side expression of the binary operator. 633 const MCExpr *getRHS() const { return RHS; } 634 635 /// @} 636 637 static bool classof(const MCExpr *E) { 638 return E->getKind() == MCExpr::Binary; 639 } 640 }; 641 642 /// This is an extension point for target-specific MCExpr subclasses to 643 /// implement. 644 /// 645 /// NOTE: All subclasses are required to have trivial destructors because 646 /// MCExprs are bump pointer allocated and not destructed. 647 class MCTargetExpr : public MCExpr { 648 virtual void anchor(); 649 650 protected: 651 MCTargetExpr() : MCExpr(Target, SMLoc()) {} 652 virtual ~MCTargetExpr() = default; 653 654 public: 655 virtual void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const = 0; 656 virtual bool evaluateAsRelocatableImpl(MCValue &Res, 657 const MCAsmLayout *Layout, 658 const MCFixup *Fixup) const = 0; 659 // allow Target Expressions to be checked for equality 660 virtual bool isEqualTo(const MCExpr *x) const { return false; } 661 // This should be set when assigned expressions are not valid ".set" 662 // expressions, e.g. registers, and must be inlined. 663 virtual bool inlineAssignedExpr() const { return false; } 664 virtual void visitUsedExpr(MCStreamer& Streamer) const = 0; 665 virtual MCFragment *findAssociatedFragment() const = 0; 666 667 virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0; 668 669 static bool classof(const MCExpr *E) { 670 return E->getKind() == MCExpr::Target; 671 } 672 }; 673 674 } // end namespace llvm 675 676 #endif // LLVM_MC_MCEXPR_H 677