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) Kind(Kind)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 getSubclassData()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 getKind()81 ExprKind getKind() const { return Kind; } getLoc()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 encodeSubclassData(bool PrintInHex,unsigned SizeInBytes)152 static unsigned encodeSubclassData(bool PrintInHex, unsigned SizeInBytes) { 153 assert(SizeInBytes <= sizeof(int64_t) && "Excessive size"); 154 return SizeInBytes | (PrintInHex ? PrintInHexBit : 0); 155 } 156 MCConstantExpr(int64_t Value,bool PrintInHex,unsigned SizeInBytes)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 getValue()173 int64_t getValue() const { return Value; } getSizeInBytes()174 unsigned getSizeInBytes() const { 175 return getSubclassData() & SizeInBytesMask; 176 } 177 useHexFormat()178 bool useHexFormat() const { return (getSubclassData() & PrintInHexBit) != 0; } 179 180 /// @} 181 classof(const MCExpr * E)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_TLSIE, // symbol@ie 303 VK_PPC_AIX_TLSLE, // symbol@le 304 VK_PPC_GOT_TLSLD, // symbol@got@tlsld 305 VK_PPC_GOT_TLSLD_LO, // symbol@got@tlsld@l 306 VK_PPC_GOT_TLSLD_HI, // symbol@got@tlsld@h 307 VK_PPC_GOT_TLSLD_HA, // symbol@got@tlsld@ha 308 VK_PPC_GOT_PCREL, // symbol@got@pcrel 309 VK_PPC_GOT_TLSGD_PCREL, // symbol@got@tlsgd@pcrel 310 VK_PPC_GOT_TLSLD_PCREL, // symbol@got@tlsld@pcrel 311 VK_PPC_GOT_TPREL_PCREL, // symbol@got@tprel@pcrel 312 VK_PPC_TLS_PCREL, // symbol@tls@pcrel 313 VK_PPC_TLSLD, // symbol@tlsld 314 VK_PPC_LOCAL, // symbol@local 315 VK_PPC_NOTOC, // symbol@notoc 316 VK_PPC_PCREL_OPT, // .reloc expr, R_PPC64_PCREL_OPT, expr 317 318 VK_COFF_IMGREL32, // symbol@imgrel (image-relative) 319 320 VK_Hexagon_LO16, 321 VK_Hexagon_HI16, 322 VK_Hexagon_GPREL, 323 VK_Hexagon_GD_GOT, 324 VK_Hexagon_LD_GOT, 325 VK_Hexagon_GD_PLT, 326 VK_Hexagon_LD_PLT, 327 VK_Hexagon_IE, 328 VK_Hexagon_IE_GOT, 329 330 VK_WASM_TYPEINDEX, // Reference to a symbol's type (signature) 331 VK_WASM_TLSREL, // Memory address relative to __tls_base 332 VK_WASM_MBREL, // Memory address relative to __memory_base 333 VK_WASM_TBREL, // Table index relative to __table_base 334 VK_WASM_GOT_TLS, // Wasm global index of TLS symbol. 335 VK_WASM_FUNCINDEX, // Wasm function index. 336 337 VK_AMDGPU_GOTPCREL32_LO, // symbol@gotpcrel32@lo 338 VK_AMDGPU_GOTPCREL32_HI, // symbol@gotpcrel32@hi 339 VK_AMDGPU_REL32_LO, // symbol@rel32@lo 340 VK_AMDGPU_REL32_HI, // symbol@rel32@hi 341 VK_AMDGPU_REL64, // symbol@rel64 342 VK_AMDGPU_ABS32_LO, // symbol@abs32@lo 343 VK_AMDGPU_ABS32_HI, // symbol@abs32@hi 344 345 VK_VE_HI32, // symbol@hi 346 VK_VE_LO32, // symbol@lo 347 VK_VE_PC_HI32, // symbol@pc_hi 348 VK_VE_PC_LO32, // symbol@pc_lo 349 VK_VE_GOT_HI32, // symbol@got_hi 350 VK_VE_GOT_LO32, // symbol@got_lo 351 VK_VE_GOTOFF_HI32, // symbol@gotoff_hi 352 VK_VE_GOTOFF_LO32, // symbol@gotoff_lo 353 VK_VE_PLT_HI32, // symbol@plt_hi 354 VK_VE_PLT_LO32, // symbol@plt_lo 355 VK_VE_TLS_GD_HI32, // symbol@tls_gd_hi 356 VK_VE_TLS_GD_LO32, // symbol@tls_gd_lo 357 VK_VE_TPOFF_HI32, // symbol@tpoff_hi 358 VK_VE_TPOFF_LO32, // symbol@tpoff_lo 359 360 VK_TPREL, 361 VK_DTPREL 362 }; 363 364 private: 365 /// The symbol being referenced. 366 const MCSymbol *Symbol; 367 368 // Subclass data stores VariantKind in bits 0..15 and HasSubsectionsViaSymbols 369 // in bit 16. 370 static const unsigned VariantKindBits = 16; 371 static const unsigned VariantKindMask = (1 << VariantKindBits) - 1; 372 373 // FIXME: Remove this bit. 374 static const unsigned HasSubsectionsViaSymbolsBit = 1 << VariantKindBits; 375 encodeSubclassData(VariantKind Kind,bool HasSubsectionsViaSymbols)376 static unsigned encodeSubclassData(VariantKind Kind, 377 bool HasSubsectionsViaSymbols) { 378 return (unsigned)Kind | 379 (HasSubsectionsViaSymbols ? HasSubsectionsViaSymbolsBit : 0); 380 } 381 382 explicit MCSymbolRefExpr(const MCSymbol *Symbol, VariantKind Kind, 383 const MCAsmInfo *MAI, SMLoc Loc = SMLoc()); 384 385 public: 386 /// \name Construction 387 /// @{ 388 create(const MCSymbol * Symbol,MCContext & Ctx)389 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, MCContext &Ctx) { 390 return MCSymbolRefExpr::create(Symbol, VK_None, Ctx); 391 } 392 393 static const MCSymbolRefExpr *create(const MCSymbol *Symbol, VariantKind Kind, 394 MCContext &Ctx, SMLoc Loc = SMLoc()); 395 static const MCSymbolRefExpr *create(StringRef Name, VariantKind Kind, 396 MCContext &Ctx); 397 398 /// @} 399 /// \name Accessors 400 /// @{ 401 getSymbol()402 const MCSymbol &getSymbol() const { return *Symbol; } 403 getKind()404 VariantKind getKind() const { 405 return (VariantKind)(getSubclassData() & VariantKindMask); 406 } 407 hasSubsectionsViaSymbols()408 bool hasSubsectionsViaSymbols() const { 409 return (getSubclassData() & HasSubsectionsViaSymbolsBit) != 0; 410 } 411 412 /// @} 413 /// \name Static Utility Functions 414 /// @{ 415 416 static StringRef getVariantKindName(VariantKind Kind); 417 418 static VariantKind getVariantKindForName(StringRef Name); 419 420 /// @} 421 classof(const MCExpr * E)422 static bool classof(const MCExpr *E) { 423 return E->getKind() == MCExpr::SymbolRef; 424 } 425 }; 426 427 /// Unary assembler expressions. 428 class MCUnaryExpr : public MCExpr { 429 public: 430 enum Opcode { 431 LNot, ///< Logical negation. 432 Minus, ///< Unary minus. 433 Not, ///< Bitwise negation. 434 Plus ///< Unary plus. 435 }; 436 437 private: 438 const MCExpr *Expr; 439 MCUnaryExpr(Opcode Op,const MCExpr * Expr,SMLoc Loc)440 MCUnaryExpr(Opcode Op, const MCExpr *Expr, SMLoc Loc) 441 : MCExpr(MCExpr::Unary, Loc, Op), Expr(Expr) {} 442 443 public: 444 /// \name Construction 445 /// @{ 446 447 static const MCUnaryExpr *create(Opcode Op, const MCExpr *Expr, 448 MCContext &Ctx, SMLoc Loc = SMLoc()); 449 450 static const MCUnaryExpr *createLNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 451 return create(LNot, Expr, Ctx, Loc); 452 } 453 454 static const MCUnaryExpr *createMinus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 455 return create(Minus, Expr, Ctx, Loc); 456 } 457 458 static const MCUnaryExpr *createNot(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 459 return create(Not, Expr, Ctx, Loc); 460 } 461 462 static const MCUnaryExpr *createPlus(const MCExpr *Expr, MCContext &Ctx, SMLoc Loc = SMLoc()) { 463 return create(Plus, Expr, Ctx, Loc); 464 } 465 466 /// @} 467 /// \name Accessors 468 /// @{ 469 470 /// Get the kind of this unary expression. getOpcode()471 Opcode getOpcode() const { return (Opcode)getSubclassData(); } 472 473 /// Get the child of this unary expression. getSubExpr()474 const MCExpr *getSubExpr() const { return Expr; } 475 476 /// @} 477 classof(const MCExpr * E)478 static bool classof(const MCExpr *E) { 479 return E->getKind() == MCExpr::Unary; 480 } 481 }; 482 483 /// Binary assembler expressions. 484 class MCBinaryExpr : public MCExpr { 485 public: 486 enum Opcode { 487 Add, ///< Addition. 488 And, ///< Bitwise and. 489 Div, ///< Signed division. 490 EQ, ///< Equality comparison. 491 GT, ///< Signed greater than comparison (result is either 0 or some 492 ///< target-specific non-zero value) 493 GTE, ///< Signed greater than or equal comparison (result is either 0 or 494 ///< some target-specific non-zero value). 495 LAnd, ///< Logical and. 496 LOr, ///< Logical or. 497 LT, ///< Signed less than comparison (result is either 0 or 498 ///< some target-specific non-zero value). 499 LTE, ///< Signed less than or equal comparison (result is either 0 or 500 ///< some target-specific non-zero value). 501 Mod, ///< Signed remainder. 502 Mul, ///< Multiplication. 503 NE, ///< Inequality comparison. 504 Or, ///< Bitwise or. 505 OrNot, ///< Bitwise or not. 506 Shl, ///< Shift left. 507 AShr, ///< Arithmetic shift right. 508 LShr, ///< Logical shift right. 509 Sub, ///< Subtraction. 510 Xor ///< Bitwise exclusive or. 511 }; 512 513 private: 514 const MCExpr *LHS, *RHS; 515 516 MCBinaryExpr(Opcode Op, const MCExpr *LHS, const MCExpr *RHS, 517 SMLoc Loc = SMLoc()) MCExpr(MCExpr::Binary,Loc,Op)518 : MCExpr(MCExpr::Binary, Loc, Op), LHS(LHS), RHS(RHS) {} 519 520 public: 521 /// \name Construction 522 /// @{ 523 524 static const MCBinaryExpr *create(Opcode Op, const MCExpr *LHS, 525 const MCExpr *RHS, MCContext &Ctx, 526 SMLoc Loc = SMLoc()); 527 createAdd(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)528 static const MCBinaryExpr *createAdd(const MCExpr *LHS, const MCExpr *RHS, 529 MCContext &Ctx) { 530 return create(Add, LHS, RHS, Ctx); 531 } 532 createAnd(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)533 static const MCBinaryExpr *createAnd(const MCExpr *LHS, const MCExpr *RHS, 534 MCContext &Ctx) { 535 return create(And, LHS, RHS, Ctx); 536 } 537 createDiv(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)538 static const MCBinaryExpr *createDiv(const MCExpr *LHS, const MCExpr *RHS, 539 MCContext &Ctx) { 540 return create(Div, LHS, RHS, Ctx); 541 } 542 createEQ(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)543 static const MCBinaryExpr *createEQ(const MCExpr *LHS, const MCExpr *RHS, 544 MCContext &Ctx) { 545 return create(EQ, LHS, RHS, Ctx); 546 } 547 createGT(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)548 static const MCBinaryExpr *createGT(const MCExpr *LHS, const MCExpr *RHS, 549 MCContext &Ctx) { 550 return create(GT, LHS, RHS, Ctx); 551 } 552 createGTE(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)553 static const MCBinaryExpr *createGTE(const MCExpr *LHS, const MCExpr *RHS, 554 MCContext &Ctx) { 555 return create(GTE, LHS, RHS, Ctx); 556 } 557 createLAnd(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)558 static const MCBinaryExpr *createLAnd(const MCExpr *LHS, const MCExpr *RHS, 559 MCContext &Ctx) { 560 return create(LAnd, LHS, RHS, Ctx); 561 } 562 createLOr(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)563 static const MCBinaryExpr *createLOr(const MCExpr *LHS, const MCExpr *RHS, 564 MCContext &Ctx) { 565 return create(LOr, LHS, RHS, Ctx); 566 } 567 createLT(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)568 static const MCBinaryExpr *createLT(const MCExpr *LHS, const MCExpr *RHS, 569 MCContext &Ctx) { 570 return create(LT, LHS, RHS, Ctx); 571 } 572 createLTE(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)573 static const MCBinaryExpr *createLTE(const MCExpr *LHS, const MCExpr *RHS, 574 MCContext &Ctx) { 575 return create(LTE, LHS, RHS, Ctx); 576 } 577 createMod(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)578 static const MCBinaryExpr *createMod(const MCExpr *LHS, const MCExpr *RHS, 579 MCContext &Ctx) { 580 return create(Mod, LHS, RHS, Ctx); 581 } 582 createMul(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)583 static const MCBinaryExpr *createMul(const MCExpr *LHS, const MCExpr *RHS, 584 MCContext &Ctx) { 585 return create(Mul, LHS, RHS, Ctx); 586 } 587 createNE(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)588 static const MCBinaryExpr *createNE(const MCExpr *LHS, const MCExpr *RHS, 589 MCContext &Ctx) { 590 return create(NE, LHS, RHS, Ctx); 591 } 592 createOr(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)593 static const MCBinaryExpr *createOr(const MCExpr *LHS, const MCExpr *RHS, 594 MCContext &Ctx) { 595 return create(Or, LHS, RHS, Ctx); 596 } 597 createShl(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)598 static const MCBinaryExpr *createShl(const MCExpr *LHS, const MCExpr *RHS, 599 MCContext &Ctx) { 600 return create(Shl, LHS, RHS, Ctx); 601 } 602 createAShr(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)603 static const MCBinaryExpr *createAShr(const MCExpr *LHS, const MCExpr *RHS, 604 MCContext &Ctx) { 605 return create(AShr, LHS, RHS, Ctx); 606 } 607 createLShr(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)608 static const MCBinaryExpr *createLShr(const MCExpr *LHS, const MCExpr *RHS, 609 MCContext &Ctx) { 610 return create(LShr, LHS, RHS, Ctx); 611 } 612 createSub(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)613 static const MCBinaryExpr *createSub(const MCExpr *LHS, const MCExpr *RHS, 614 MCContext &Ctx) { 615 return create(Sub, LHS, RHS, Ctx); 616 } 617 createXor(const MCExpr * LHS,const MCExpr * RHS,MCContext & Ctx)618 static const MCBinaryExpr *createXor(const MCExpr *LHS, const MCExpr *RHS, 619 MCContext &Ctx) { 620 return create(Xor, LHS, RHS, Ctx); 621 } 622 623 /// @} 624 /// \name Accessors 625 /// @{ 626 627 /// Get the kind of this binary expression. getOpcode()628 Opcode getOpcode() const { return (Opcode)getSubclassData(); } 629 630 /// Get the left-hand side expression of the binary operator. getLHS()631 const MCExpr *getLHS() const { return LHS; } 632 633 /// Get the right-hand side expression of the binary operator. getRHS()634 const MCExpr *getRHS() const { return RHS; } 635 636 /// @} 637 classof(const MCExpr * E)638 static bool classof(const MCExpr *E) { 639 return E->getKind() == MCExpr::Binary; 640 } 641 }; 642 643 /// This is an extension point for target-specific MCExpr subclasses to 644 /// implement. 645 /// 646 /// NOTE: All subclasses are required to have trivial destructors because 647 /// MCExprs are bump pointer allocated and not destructed. 648 class MCTargetExpr : public MCExpr { 649 virtual void anchor(); 650 651 protected: MCTargetExpr()652 MCTargetExpr() : MCExpr(Target, SMLoc()) {} 653 virtual ~MCTargetExpr() = default; 654 655 public: 656 virtual void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const = 0; 657 virtual bool evaluateAsRelocatableImpl(MCValue &Res, 658 const MCAsmLayout *Layout, 659 const MCFixup *Fixup) const = 0; 660 // allow Target Expressions to be checked for equality isEqualTo(const MCExpr * x)661 virtual bool isEqualTo(const MCExpr *x) const { return false; } 662 // This should be set when assigned expressions are not valid ".set" 663 // expressions, e.g. registers, and must be inlined. inlineAssignedExpr()664 virtual bool inlineAssignedExpr() const { return false; } 665 virtual void visitUsedExpr(MCStreamer& Streamer) const = 0; 666 virtual MCFragment *findAssociatedFragment() const = 0; 667 668 virtual void fixELFSymbolsInTLSFixups(MCAssembler &) const = 0; 669 classof(const MCExpr * E)670 static bool classof(const MCExpr *E) { 671 return E->getKind() == MCExpr::Target; 672 } 673 }; 674 675 } // end namespace llvm 676 677 #endif // LLVM_MC_MCEXPR_H 678