1 //===- AsmParser.cpp - Parser for Assembly Files --------------------------===// 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 // This class implements a parser for assembly files similar to gas syntax. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/ADT/APFloat.h" 14 #include "llvm/ADT/APInt.h" 15 #include "llvm/ADT/ArrayRef.h" 16 #include "llvm/ADT/None.h" 17 #include "llvm/ADT/STLExtras.h" 18 #include "llvm/ADT/SmallSet.h" 19 #include "llvm/ADT/SmallString.h" 20 #include "llvm/ADT/SmallVector.h" 21 #include "llvm/ADT/StringExtras.h" 22 #include "llvm/ADT/StringMap.h" 23 #include "llvm/ADT/StringRef.h" 24 #include "llvm/ADT/Twine.h" 25 #include "llvm/BinaryFormat/Dwarf.h" 26 #include "llvm/DebugInfo/CodeView/SymbolRecord.h" 27 #include "llvm/MC/MCAsmInfo.h" 28 #include "llvm/MC/MCCodeView.h" 29 #include "llvm/MC/MCContext.h" 30 #include "llvm/MC/MCDirectives.h" 31 #include "llvm/MC/MCDwarf.h" 32 #include "llvm/MC/MCExpr.h" 33 #include "llvm/MC/MCInstPrinter.h" 34 #include "llvm/MC/MCInstrDesc.h" 35 #include "llvm/MC/MCInstrInfo.h" 36 #include "llvm/MC/MCParser/AsmCond.h" 37 #include "llvm/MC/MCParser/AsmLexer.h" 38 #include "llvm/MC/MCParser/MCAsmLexer.h" 39 #include "llvm/MC/MCParser/MCAsmParser.h" 40 #include "llvm/MC/MCParser/MCAsmParserExtension.h" 41 #include "llvm/MC/MCParser/MCAsmParserUtils.h" 42 #include "llvm/MC/MCParser/MCParsedAsmOperand.h" 43 #include "llvm/MC/MCParser/MCTargetAsmParser.h" 44 #include "llvm/MC/MCRegisterInfo.h" 45 #include "llvm/MC/MCSection.h" 46 #include "llvm/MC/MCStreamer.h" 47 #include "llvm/MC/MCSymbol.h" 48 #include "llvm/MC/MCTargetOptions.h" 49 #include "llvm/MC/MCValue.h" 50 #include "llvm/Support/Casting.h" 51 #include "llvm/Support/CommandLine.h" 52 #include "llvm/Support/ErrorHandling.h" 53 #include "llvm/Support/MD5.h" 54 #include "llvm/Support/MathExtras.h" 55 #include "llvm/Support/MemoryBuffer.h" 56 #include "llvm/Support/SMLoc.h" 57 #include "llvm/Support/SourceMgr.h" 58 #include "llvm/Support/raw_ostream.h" 59 #include <algorithm> 60 #include <cassert> 61 #include <cctype> 62 #include <climits> 63 #include <cstddef> 64 #include <cstdint> 65 #include <deque> 66 #include <memory> 67 #include <sstream> 68 #include <string> 69 #include <tuple> 70 #include <utility> 71 #include <vector> 72 73 using namespace llvm; 74 75 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() = default; 76 77 extern cl::opt<unsigned> AsmMacroMaxNestingDepth; 78 79 namespace { 80 81 /// Helper types for tracking macro definitions. 82 typedef std::vector<AsmToken> MCAsmMacroArgument; 83 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments; 84 85 /// Helper class for storing information about an active macro 86 /// instantiation. 87 struct MacroInstantiation { 88 /// The location of the instantiation. 89 SMLoc InstantiationLoc; 90 91 /// The buffer where parsing should resume upon instantiation completion. 92 unsigned ExitBuffer; 93 94 /// The location where parsing should resume upon instantiation completion. 95 SMLoc ExitLoc; 96 97 /// The depth of TheCondStack at the start of the instantiation. 98 size_t CondStackDepth; 99 }; 100 101 struct ParseStatementInfo { 102 /// The parsed operands from the last parsed statement. 103 SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands; 104 105 /// The opcode from the last parsed instruction. 106 unsigned Opcode = ~0U; 107 108 /// Was there an error parsing the inline assembly? 109 bool ParseError = false; 110 111 SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr; 112 113 ParseStatementInfo() = delete; 114 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites) 115 : AsmRewrites(rewrites) {} 116 }; 117 118 /// The concrete assembly parser instance. 119 class AsmParser : public MCAsmParser { 120 private: 121 AsmLexer Lexer; 122 MCContext &Ctx; 123 MCStreamer &Out; 124 const MCAsmInfo &MAI; 125 SourceMgr &SrcMgr; 126 SourceMgr::DiagHandlerTy SavedDiagHandler; 127 void *SavedDiagContext; 128 std::unique_ptr<MCAsmParserExtension> PlatformParser; 129 SMLoc StartTokLoc; 130 131 /// This is the current buffer index we're lexing from as managed by the 132 /// SourceMgr object. 133 unsigned CurBuffer; 134 135 AsmCond TheCondState; 136 std::vector<AsmCond> TheCondStack; 137 138 /// maps directive names to handler methods in parser 139 /// extensions. Extensions register themselves in this map by calling 140 /// addDirectiveHandler. 141 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap; 142 143 /// Stack of active macro instantiations. 144 std::vector<MacroInstantiation*> ActiveMacros; 145 146 /// List of bodies of anonymous macros. 147 std::deque<MCAsmMacro> MacroLikeBodies; 148 149 /// Boolean tracking whether macro substitution is enabled. 150 unsigned MacrosEnabledFlag : 1; 151 152 /// Keeps track of how many .macro's have been instantiated. 153 unsigned NumOfMacroInstantiations; 154 155 /// The values from the last parsed cpp hash file line comment if any. 156 struct CppHashInfoTy { 157 StringRef Filename; 158 int64_t LineNumber; 159 SMLoc Loc; 160 unsigned Buf; 161 CppHashInfoTy() : LineNumber(0), Buf(0) {} 162 }; 163 CppHashInfoTy CppHashInfo; 164 165 /// The filename from the first cpp hash file line comment, if any. 166 StringRef FirstCppHashFilename; 167 168 /// List of forward directional labels for diagnosis at the end. 169 SmallVector<std::tuple<SMLoc, CppHashInfoTy, MCSymbol *>, 4> DirLabels; 170 171 SmallSet<StringRef, 2> LTODiscardSymbols; 172 173 /// AssemblerDialect. ~OU means unset value and use value provided by MAI. 174 unsigned AssemblerDialect = ~0U; 175 176 /// is Darwin compatibility enabled? 177 bool IsDarwin = false; 178 179 /// Are we parsing ms-style inline assembly? 180 bool ParsingMSInlineAsm = false; 181 182 /// Did we already inform the user about inconsistent MD5 usage? 183 bool ReportedInconsistentMD5 = false; 184 185 // Is alt macro mode enabled. 186 bool AltMacroMode = false; 187 188 protected: 189 virtual bool parseStatement(ParseStatementInfo &Info, 190 MCAsmParserSemaCallback *SI); 191 192 /// This routine uses the target specific ParseInstruction function to 193 /// parse an instruction into Operands, and then call the target specific 194 /// MatchAndEmit function to match and emit the instruction. 195 bool parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info, 196 StringRef IDVal, AsmToken ID, 197 SMLoc IDLoc); 198 199 /// Should we emit DWARF describing this assembler source? (Returns false if 200 /// the source has .file directives, which means we don't want to generate 201 /// info describing the assembler source itself.) 202 bool enabledGenDwarfForAssembly(); 203 204 public: 205 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 206 const MCAsmInfo &MAI, unsigned CB); 207 AsmParser(const AsmParser &) = delete; 208 AsmParser &operator=(const AsmParser &) = delete; 209 ~AsmParser() override; 210 211 bool Run(bool NoInitialTextSection, bool NoFinalize = false) override; 212 213 void addDirectiveHandler(StringRef Directive, 214 ExtensionDirectiveHandler Handler) override { 215 ExtensionDirectiveMap[Directive] = Handler; 216 } 217 218 void addAliasForDirective(StringRef Directive, StringRef Alias) override { 219 DirectiveKindMap[Directive.lower()] = DirectiveKindMap[Alias.lower()]; 220 } 221 222 /// @name MCAsmParser Interface 223 /// { 224 225 SourceMgr &getSourceManager() override { return SrcMgr; } 226 MCAsmLexer &getLexer() override { return Lexer; } 227 MCContext &getContext() override { return Ctx; } 228 MCStreamer &getStreamer() override { return Out; } 229 230 CodeViewContext &getCVContext() { return Ctx.getCVContext(); } 231 232 unsigned getAssemblerDialect() override { 233 if (AssemblerDialect == ~0U) 234 return MAI.getAssemblerDialect(); 235 else 236 return AssemblerDialect; 237 } 238 void setAssemblerDialect(unsigned i) override { 239 AssemblerDialect = i; 240 } 241 242 void Note(SMLoc L, const Twine &Msg, SMRange Range = None) override; 243 bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) override; 244 bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) override; 245 246 const AsmToken &Lex() override; 247 248 void setParsingMSInlineAsm(bool V) override { 249 ParsingMSInlineAsm = V; 250 // When parsing MS inline asm, we must lex 0b1101 and 0ABCH as binary and 251 // hex integer literals. 252 Lexer.setLexMasmIntegers(V); 253 } 254 bool isParsingMSInlineAsm() override { return ParsingMSInlineAsm; } 255 256 bool discardLTOSymbol(StringRef Name) const override { 257 return LTODiscardSymbols.contains(Name); 258 } 259 260 bool parseMSInlineAsm(std::string &AsmString, unsigned &NumOutputs, 261 unsigned &NumInputs, 262 SmallVectorImpl<std::pair<void *, bool>> &OpDecls, 263 SmallVectorImpl<std::string> &Constraints, 264 SmallVectorImpl<std::string> &Clobbers, 265 const MCInstrInfo *MII, const MCInstPrinter *IP, 266 MCAsmParserSemaCallback &SI) override; 267 268 bool parseExpression(const MCExpr *&Res); 269 bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 270 bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc, 271 AsmTypeInfo *TypeInfo) override; 272 bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 273 bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 274 SMLoc &EndLoc) override; 275 bool parseAbsoluteExpression(int64_t &Res) override; 276 277 /// Parse a floating point expression using the float \p Semantics 278 /// and set \p Res to the value. 279 bool parseRealValue(const fltSemantics &Semantics, APInt &Res); 280 281 /// Parse an identifier or string (as a quoted identifier) 282 /// and set \p Res to the identifier contents. 283 bool parseIdentifier(StringRef &Res) override; 284 void eatToEndOfStatement() override; 285 286 bool checkForValidSection() override; 287 288 /// } 289 290 private: 291 bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites); 292 bool parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo = true); 293 294 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body, 295 ArrayRef<MCAsmMacroParameter> Parameters); 296 bool expandMacro(raw_svector_ostream &OS, StringRef Body, 297 ArrayRef<MCAsmMacroParameter> Parameters, 298 ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable, 299 SMLoc L); 300 301 /// Are macros enabled in the parser? 302 bool areMacrosEnabled() {return MacrosEnabledFlag;} 303 304 /// Control a flag in the parser that enables or disables macros. 305 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;} 306 307 /// Are we inside a macro instantiation? 308 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();} 309 310 /// Handle entry to macro instantiation. 311 /// 312 /// \param M The macro. 313 /// \param NameLoc Instantiation location. 314 bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc); 315 316 /// Handle exit from macro instantiation. 317 void handleMacroExit(); 318 319 /// Extract AsmTokens for a macro argument. 320 bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg); 321 322 /// Parse all macro arguments for a given macro. 323 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A); 324 325 void printMacroInstantiations(); 326 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg, 327 SMRange Range = None) const { 328 ArrayRef<SMRange> Ranges(Range); 329 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges); 330 } 331 static void DiagHandler(const SMDiagnostic &Diag, void *Context); 332 333 /// Enter the specified file. This returns true on failure. 334 bool enterIncludeFile(const std::string &Filename); 335 336 /// Process the specified file for the .incbin directive. 337 /// This returns true on failure. 338 bool processIncbinFile(const std::string &Filename, int64_t Skip = 0, 339 const MCExpr *Count = nullptr, SMLoc Loc = SMLoc()); 340 341 /// Reset the current lexer position to that given by \p Loc. The 342 /// current token is not set; clients should ensure Lex() is called 343 /// subsequently. 344 /// 345 /// \param InBuffer If not 0, should be the known buffer id that contains the 346 /// location. 347 void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0); 348 349 /// Parse up to the end of statement and a return the contents from the 350 /// current token until the end of the statement; the current token on exit 351 /// will be either the EndOfStatement or EOF. 352 StringRef parseStringToEndOfStatement() override; 353 354 /// Parse until the end of a statement or a comma is encountered, 355 /// return the contents from the current token up to the end or comma. 356 StringRef parseStringToComma(); 357 358 enum class AssignmentKind { 359 Set, 360 Equiv, 361 Equal, 362 LTOSetConditional, 363 }; 364 365 bool parseAssignment(StringRef Name, AssignmentKind Kind); 366 367 unsigned getBinOpPrecedence(AsmToken::TokenKind K, 368 MCBinaryExpr::Opcode &Kind); 369 370 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); 371 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); 372 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); 373 374 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); 375 376 bool parseCVFunctionId(int64_t &FunctionId, StringRef DirectiveName); 377 bool parseCVFileId(int64_t &FileId, StringRef DirectiveName); 378 379 // Generic (target and platform independent) directive parsing. 380 enum DirectiveKind { 381 DK_NO_DIRECTIVE, // Placeholder 382 DK_SET, 383 DK_EQU, 384 DK_EQUIV, 385 DK_ASCII, 386 DK_ASCIZ, 387 DK_STRING, 388 DK_BYTE, 389 DK_SHORT, 390 DK_RELOC, 391 DK_VALUE, 392 DK_2BYTE, 393 DK_LONG, 394 DK_INT, 395 DK_4BYTE, 396 DK_QUAD, 397 DK_8BYTE, 398 DK_OCTA, 399 DK_DC, 400 DK_DC_A, 401 DK_DC_B, 402 DK_DC_D, 403 DK_DC_L, 404 DK_DC_S, 405 DK_DC_W, 406 DK_DC_X, 407 DK_DCB, 408 DK_DCB_B, 409 DK_DCB_D, 410 DK_DCB_L, 411 DK_DCB_S, 412 DK_DCB_W, 413 DK_DCB_X, 414 DK_DS, 415 DK_DS_B, 416 DK_DS_D, 417 DK_DS_L, 418 DK_DS_P, 419 DK_DS_S, 420 DK_DS_W, 421 DK_DS_X, 422 DK_SINGLE, 423 DK_FLOAT, 424 DK_DOUBLE, 425 DK_ALIGN, 426 DK_ALIGN32, 427 DK_BALIGN, 428 DK_BALIGNW, 429 DK_BALIGNL, 430 DK_P2ALIGN, 431 DK_P2ALIGNW, 432 DK_P2ALIGNL, 433 DK_ORG, 434 DK_FILL, 435 DK_ENDR, 436 DK_BUNDLE_ALIGN_MODE, 437 DK_BUNDLE_LOCK, 438 DK_BUNDLE_UNLOCK, 439 DK_ZERO, 440 DK_EXTERN, 441 DK_GLOBL, 442 DK_GLOBAL, 443 DK_LAZY_REFERENCE, 444 DK_NO_DEAD_STRIP, 445 DK_SYMBOL_RESOLVER, 446 DK_PRIVATE_EXTERN, 447 DK_REFERENCE, 448 DK_WEAK_DEFINITION, 449 DK_WEAK_REFERENCE, 450 DK_WEAK_DEF_CAN_BE_HIDDEN, 451 DK_COLD, 452 DK_COMM, 453 DK_COMMON, 454 DK_LCOMM, 455 DK_ABORT, 456 DK_INCLUDE, 457 DK_INCBIN, 458 DK_CODE16, 459 DK_CODE16GCC, 460 DK_REPT, 461 DK_IRP, 462 DK_IRPC, 463 DK_IF, 464 DK_IFEQ, 465 DK_IFGE, 466 DK_IFGT, 467 DK_IFLE, 468 DK_IFLT, 469 DK_IFNE, 470 DK_IFB, 471 DK_IFNB, 472 DK_IFC, 473 DK_IFEQS, 474 DK_IFNC, 475 DK_IFNES, 476 DK_IFDEF, 477 DK_IFNDEF, 478 DK_IFNOTDEF, 479 DK_ELSEIF, 480 DK_ELSE, 481 DK_ENDIF, 482 DK_SPACE, 483 DK_SKIP, 484 DK_FILE, 485 DK_LINE, 486 DK_LOC, 487 DK_STABS, 488 DK_CV_FILE, 489 DK_CV_FUNC_ID, 490 DK_CV_INLINE_SITE_ID, 491 DK_CV_LOC, 492 DK_CV_LINETABLE, 493 DK_CV_INLINE_LINETABLE, 494 DK_CV_DEF_RANGE, 495 DK_CV_STRINGTABLE, 496 DK_CV_STRING, 497 DK_CV_FILECHECKSUMS, 498 DK_CV_FILECHECKSUM_OFFSET, 499 DK_CV_FPO_DATA, 500 DK_CFI_SECTIONS, 501 DK_CFI_STARTPROC, 502 DK_CFI_ENDPROC, 503 DK_CFI_DEF_CFA, 504 DK_CFI_DEF_CFA_OFFSET, 505 DK_CFI_ADJUST_CFA_OFFSET, 506 DK_CFI_DEF_CFA_REGISTER, 507 DK_CFI_LLVM_DEF_ASPACE_CFA, 508 DK_CFI_OFFSET, 509 DK_CFI_REL_OFFSET, 510 DK_CFI_PERSONALITY, 511 DK_CFI_LSDA, 512 DK_CFI_REMEMBER_STATE, 513 DK_CFI_RESTORE_STATE, 514 DK_CFI_SAME_VALUE, 515 DK_CFI_RESTORE, 516 DK_CFI_ESCAPE, 517 DK_CFI_RETURN_COLUMN, 518 DK_CFI_SIGNAL_FRAME, 519 DK_CFI_UNDEFINED, 520 DK_CFI_REGISTER, 521 DK_CFI_WINDOW_SAVE, 522 DK_CFI_B_KEY_FRAME, 523 DK_MACROS_ON, 524 DK_MACROS_OFF, 525 DK_ALTMACRO, 526 DK_NOALTMACRO, 527 DK_MACRO, 528 DK_EXITM, 529 DK_ENDM, 530 DK_ENDMACRO, 531 DK_PURGEM, 532 DK_SLEB128, 533 DK_ULEB128, 534 DK_ERR, 535 DK_ERROR, 536 DK_WARNING, 537 DK_PRINT, 538 DK_ADDRSIG, 539 DK_ADDRSIG_SYM, 540 DK_PSEUDO_PROBE, 541 DK_LTO_DISCARD, 542 DK_LTO_SET_CONDITIONAL, 543 DK_CFI_MTE_TAGGED_FRAME, 544 DK_END 545 }; 546 547 /// Maps directive name --> DirectiveKind enum, for 548 /// directives parsed by this class. 549 StringMap<DirectiveKind> DirectiveKindMap; 550 551 // Codeview def_range type parsing. 552 enum CVDefRangeType { 553 CVDR_DEFRANGE = 0, // Placeholder 554 CVDR_DEFRANGE_REGISTER, 555 CVDR_DEFRANGE_FRAMEPOINTER_REL, 556 CVDR_DEFRANGE_SUBFIELD_REGISTER, 557 CVDR_DEFRANGE_REGISTER_REL 558 }; 559 560 /// Maps Codeview def_range types --> CVDefRangeType enum, for 561 /// Codeview def_range types parsed by this class. 562 StringMap<CVDefRangeType> CVDefRangeTypeMap; 563 564 // ".ascii", ".asciz", ".string" 565 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); 566 bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc" 567 bool parseDirectiveValue(StringRef IDVal, 568 unsigned Size); // ".byte", ".long", ... 569 bool parseDirectiveOctaValue(StringRef IDVal); // ".octa", ... 570 bool parseDirectiveRealValue(StringRef IDVal, 571 const fltSemantics &); // ".single", ... 572 bool parseDirectiveFill(); // ".fill" 573 bool parseDirectiveZero(); // ".zero" 574 // ".set", ".equ", ".equiv", ".lto_set_conditional" 575 bool parseDirectiveSet(StringRef IDVal, AssignmentKind Kind); 576 bool parseDirectiveOrg(); // ".org" 577 // ".align{,32}", ".p2align{,w,l}" 578 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize); 579 580 // ".file", ".line", ".loc", ".stabs" 581 bool parseDirectiveFile(SMLoc DirectiveLoc); 582 bool parseDirectiveLine(); 583 bool parseDirectiveLoc(); 584 bool parseDirectiveStabs(); 585 586 // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable", 587 // ".cv_inline_linetable", ".cv_def_range", ".cv_string" 588 bool parseDirectiveCVFile(); 589 bool parseDirectiveCVFuncId(); 590 bool parseDirectiveCVInlineSiteId(); 591 bool parseDirectiveCVLoc(); 592 bool parseDirectiveCVLinetable(); 593 bool parseDirectiveCVInlineLinetable(); 594 bool parseDirectiveCVDefRange(); 595 bool parseDirectiveCVString(); 596 bool parseDirectiveCVStringTable(); 597 bool parseDirectiveCVFileChecksums(); 598 bool parseDirectiveCVFileChecksumOffset(); 599 bool parseDirectiveCVFPOData(); 600 601 // .cfi directives 602 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc); 603 bool parseDirectiveCFIWindowSave(); 604 bool parseDirectiveCFISections(); 605 bool parseDirectiveCFIStartProc(); 606 bool parseDirectiveCFIEndProc(); 607 bool parseDirectiveCFIDefCfaOffset(); 608 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc); 609 bool parseDirectiveCFIAdjustCfaOffset(); 610 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc); 611 bool parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc); 612 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc); 613 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc); 614 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality); 615 bool parseDirectiveCFIRememberState(); 616 bool parseDirectiveCFIRestoreState(); 617 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc); 618 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc); 619 bool parseDirectiveCFIEscape(); 620 bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc); 621 bool parseDirectiveCFISignalFrame(); 622 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc); 623 624 // macro directives 625 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc); 626 bool parseDirectiveExitMacro(StringRef Directive); 627 bool parseDirectiveEndMacro(StringRef Directive); 628 bool parseDirectiveMacro(SMLoc DirectiveLoc); 629 bool parseDirectiveMacrosOnOff(StringRef Directive); 630 // alternate macro mode directives 631 bool parseDirectiveAltmacro(StringRef Directive); 632 // ".bundle_align_mode" 633 bool parseDirectiveBundleAlignMode(); 634 // ".bundle_lock" 635 bool parseDirectiveBundleLock(); 636 // ".bundle_unlock" 637 bool parseDirectiveBundleUnlock(); 638 639 // ".space", ".skip" 640 bool parseDirectiveSpace(StringRef IDVal); 641 642 // ".dcb" 643 bool parseDirectiveDCB(StringRef IDVal, unsigned Size); 644 bool parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &); 645 // ".ds" 646 bool parseDirectiveDS(StringRef IDVal, unsigned Size); 647 648 // .sleb128 (Signed=true) and .uleb128 (Signed=false) 649 bool parseDirectiveLEB128(bool Signed); 650 651 /// Parse a directive like ".globl" which 652 /// accepts a single symbol (which should be a label or an external). 653 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr); 654 655 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm" 656 657 bool parseDirectiveAbort(); // ".abort" 658 bool parseDirectiveInclude(); // ".include" 659 bool parseDirectiveIncbin(); // ".incbin" 660 661 // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne" 662 bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind); 663 // ".ifb" or ".ifnb", depending on ExpectBlank. 664 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank); 665 // ".ifc" or ".ifnc", depending on ExpectEqual. 666 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual); 667 // ".ifeqs" or ".ifnes", depending on ExpectEqual. 668 bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual); 669 // ".ifdef" or ".ifndef", depending on expect_defined 670 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined); 671 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif" 672 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else" 673 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif 674 bool parseEscapedString(std::string &Data) override; 675 bool parseAngleBracketString(std::string &Data) override; 676 677 const MCExpr *applyModifierToExpr(const MCExpr *E, 678 MCSymbolRefExpr::VariantKind Variant); 679 680 // Macro-like directives 681 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc); 682 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 683 raw_svector_ostream &OS); 684 bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive); 685 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp" 686 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc" 687 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr" 688 689 // "_emit" or "__emit" 690 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info, 691 size_t Len); 692 693 // "align" 694 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info); 695 696 // "end" 697 bool parseDirectiveEnd(SMLoc DirectiveLoc); 698 699 // ".err" or ".error" 700 bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage); 701 702 // ".warning" 703 bool parseDirectiveWarning(SMLoc DirectiveLoc); 704 705 // .print <double-quotes-string> 706 bool parseDirectivePrint(SMLoc DirectiveLoc); 707 708 // .pseudoprobe 709 bool parseDirectivePseudoProbe(); 710 711 // ".lto_discard" 712 bool parseDirectiveLTODiscard(); 713 714 // Directives to support address-significance tables. 715 bool parseDirectiveAddrsig(); 716 bool parseDirectiveAddrsigSym(); 717 718 void initializeDirectiveKindMap(); 719 void initializeCVDefRangeTypeMap(); 720 }; 721 722 class HLASMAsmParser final : public AsmParser { 723 private: 724 MCAsmLexer &Lexer; 725 MCStreamer &Out; 726 727 void lexLeadingSpaces() { 728 while (Lexer.is(AsmToken::Space)) 729 Lexer.Lex(); 730 } 731 732 bool parseAsHLASMLabel(ParseStatementInfo &Info, MCAsmParserSemaCallback *SI); 733 bool parseAsMachineInstruction(ParseStatementInfo &Info, 734 MCAsmParserSemaCallback *SI); 735 736 public: 737 HLASMAsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 738 const MCAsmInfo &MAI, unsigned CB = 0) 739 : AsmParser(SM, Ctx, Out, MAI, CB), Lexer(getLexer()), Out(Out) { 740 Lexer.setSkipSpace(false); 741 Lexer.setAllowHashInIdentifier(true); 742 Lexer.setLexHLASMIntegers(true); 743 Lexer.setLexHLASMStrings(true); 744 } 745 746 ~HLASMAsmParser() { Lexer.setSkipSpace(true); } 747 748 bool parseStatement(ParseStatementInfo &Info, 749 MCAsmParserSemaCallback *SI) override; 750 }; 751 752 } // end anonymous namespace 753 754 namespace llvm { 755 756 extern MCAsmParserExtension *createDarwinAsmParser(); 757 extern MCAsmParserExtension *createELFAsmParser(); 758 extern MCAsmParserExtension *createCOFFAsmParser(); 759 extern MCAsmParserExtension *createGOFFAsmParser(); 760 extern MCAsmParserExtension *createXCOFFAsmParser(); 761 extern MCAsmParserExtension *createWasmAsmParser(); 762 763 } // end namespace llvm 764 765 enum { DEFAULT_ADDRSPACE = 0 }; 766 767 AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 768 const MCAsmInfo &MAI, unsigned CB = 0) 769 : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM), 770 CurBuffer(CB ? CB : SM.getMainFileID()), MacrosEnabledFlag(true) { 771 HadError = false; 772 // Save the old handler. 773 SavedDiagHandler = SrcMgr.getDiagHandler(); 774 SavedDiagContext = SrcMgr.getDiagContext(); 775 // Set our own handler which calls the saved handler. 776 SrcMgr.setDiagHandler(DiagHandler, this); 777 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 778 // Make MCStreamer aware of the StartTokLoc for locations in diagnostics. 779 Out.setStartTokLocPtr(&StartTokLoc); 780 781 // Initialize the platform / file format parser. 782 switch (Ctx.getObjectFileType()) { 783 case MCContext::IsCOFF: 784 PlatformParser.reset(createCOFFAsmParser()); 785 break; 786 case MCContext::IsMachO: 787 PlatformParser.reset(createDarwinAsmParser()); 788 IsDarwin = true; 789 break; 790 case MCContext::IsELF: 791 PlatformParser.reset(createELFAsmParser()); 792 break; 793 case MCContext::IsGOFF: 794 PlatformParser.reset(createGOFFAsmParser()); 795 break; 796 case MCContext::IsSPIRV: 797 report_fatal_error( 798 "Need to implement createSPIRVAsmParser for SPIRV format."); 799 break; 800 case MCContext::IsWasm: 801 PlatformParser.reset(createWasmAsmParser()); 802 break; 803 case MCContext::IsXCOFF: 804 PlatformParser.reset(createXCOFFAsmParser()); 805 break; 806 case MCContext::IsDXContainer: 807 llvm_unreachable("DXContainer is not supported yet"); 808 break; 809 } 810 811 PlatformParser->Initialize(*this); 812 initializeDirectiveKindMap(); 813 initializeCVDefRangeTypeMap(); 814 815 NumOfMacroInstantiations = 0; 816 } 817 818 AsmParser::~AsmParser() { 819 assert((HadError || ActiveMacros.empty()) && 820 "Unexpected active macro instantiation!"); 821 822 // Remove MCStreamer's reference to the parser SMLoc. 823 Out.setStartTokLocPtr(nullptr); 824 // Restore the saved diagnostics handler and context for use during 825 // finalization. 826 SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext); 827 } 828 829 void AsmParser::printMacroInstantiations() { 830 // Print the active macro instantiation stack. 831 for (std::vector<MacroInstantiation *>::const_reverse_iterator 832 it = ActiveMacros.rbegin(), 833 ie = ActiveMacros.rend(); 834 it != ie; ++it) 835 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note, 836 "while in macro instantiation"); 837 } 838 839 void AsmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) { 840 printPendingErrors(); 841 printMessage(L, SourceMgr::DK_Note, Msg, Range); 842 printMacroInstantiations(); 843 } 844 845 bool AsmParser::Warning(SMLoc L, const Twine &Msg, SMRange Range) { 846 if(getTargetParser().getTargetOptions().MCNoWarn) 847 return false; 848 if (getTargetParser().getTargetOptions().MCFatalWarnings) 849 return Error(L, Msg, Range); 850 printMessage(L, SourceMgr::DK_Warning, Msg, Range); 851 printMacroInstantiations(); 852 return false; 853 } 854 855 bool AsmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) { 856 HadError = true; 857 printMessage(L, SourceMgr::DK_Error, Msg, Range); 858 printMacroInstantiations(); 859 return true; 860 } 861 862 bool AsmParser::enterIncludeFile(const std::string &Filename) { 863 std::string IncludedFile; 864 unsigned NewBuf = 865 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 866 if (!NewBuf) 867 return true; 868 869 CurBuffer = NewBuf; 870 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 871 return false; 872 } 873 874 /// Process the specified .incbin file by searching for it in the include paths 875 /// then just emitting the byte contents of the file to the streamer. This 876 /// returns true on failure. 877 bool AsmParser::processIncbinFile(const std::string &Filename, int64_t Skip, 878 const MCExpr *Count, SMLoc Loc) { 879 std::string IncludedFile; 880 unsigned NewBuf = 881 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 882 if (!NewBuf) 883 return true; 884 885 // Pick up the bytes from the file and emit them. 886 StringRef Bytes = SrcMgr.getMemoryBuffer(NewBuf)->getBuffer(); 887 Bytes = Bytes.drop_front(Skip); 888 if (Count) { 889 int64_t Res; 890 if (!Count->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr())) 891 return Error(Loc, "expected absolute expression"); 892 if (Res < 0) 893 return Warning(Loc, "negative count has no effect"); 894 Bytes = Bytes.take_front(Res); 895 } 896 getStreamer().emitBytes(Bytes); 897 return false; 898 } 899 900 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) { 901 CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc); 902 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(), 903 Loc.getPointer()); 904 } 905 906 const AsmToken &AsmParser::Lex() { 907 if (Lexer.getTok().is(AsmToken::Error)) 908 Error(Lexer.getErrLoc(), Lexer.getErr()); 909 910 // if it's a end of statement with a comment in it 911 if (getTok().is(AsmToken::EndOfStatement)) { 912 // if this is a line comment output it. 913 if (!getTok().getString().empty() && getTok().getString().front() != '\n' && 914 getTok().getString().front() != '\r' && MAI.preserveAsmComments()) 915 Out.addExplicitComment(Twine(getTok().getString())); 916 } 917 918 const AsmToken *tok = &Lexer.Lex(); 919 920 // Parse comments here to be deferred until end of next statement. 921 while (tok->is(AsmToken::Comment)) { 922 if (MAI.preserveAsmComments()) 923 Out.addExplicitComment(Twine(tok->getString())); 924 tok = &Lexer.Lex(); 925 } 926 927 if (tok->is(AsmToken::Eof)) { 928 // If this is the end of an included file, pop the parent file off the 929 // include stack. 930 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer); 931 if (ParentIncludeLoc != SMLoc()) { 932 jumpToLoc(ParentIncludeLoc); 933 return Lex(); 934 } 935 } 936 937 return *tok; 938 } 939 940 bool AsmParser::enabledGenDwarfForAssembly() { 941 // Check whether the user specified -g. 942 if (!getContext().getGenDwarfForAssembly()) 943 return false; 944 // If we haven't encountered any .file directives (which would imply that 945 // the assembler source was produced with debug info already) then emit one 946 // describing the assembler source file itself. 947 if (getContext().getGenDwarfFileNumber() == 0) { 948 // Use the first #line directive for this, if any. It's preprocessed, so 949 // there is no checksum, and of course no source directive. 950 if (!FirstCppHashFilename.empty()) 951 getContext().setMCLineTableRootFile(/*CUID=*/0, 952 getContext().getCompilationDir(), 953 FirstCppHashFilename, 954 /*Cksum=*/None, /*Source=*/None); 955 const MCDwarfFile &RootFile = 956 getContext().getMCDwarfLineTable(/*CUID=*/0).getRootFile(); 957 getContext().setGenDwarfFileNumber(getStreamer().emitDwarfFileDirective( 958 /*CUID=*/0, getContext().getCompilationDir(), RootFile.Name, 959 RootFile.Checksum, RootFile.Source)); 960 } 961 return true; 962 } 963 964 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) { 965 LTODiscardSymbols.clear(); 966 967 // Create the initial section, if requested. 968 if (!NoInitialTextSection) 969 Out.initSections(false, getTargetParser().getSTI()); 970 971 // Prime the lexer. 972 Lex(); 973 974 HadError = false; 975 AsmCond StartingCondState = TheCondState; 976 SmallVector<AsmRewrite, 4> AsmStrRewrites; 977 978 // If we are generating dwarf for assembly source files save the initial text 979 // section. (Don't use enabledGenDwarfForAssembly() here, as we aren't 980 // emitting any actual debug info yet and haven't had a chance to parse any 981 // embedded .file directives.) 982 if (getContext().getGenDwarfForAssembly()) { 983 MCSection *Sec = getStreamer().getCurrentSectionOnly(); 984 if (!Sec->getBeginSymbol()) { 985 MCSymbol *SectionStartSym = getContext().createTempSymbol(); 986 getStreamer().emitLabel(SectionStartSym); 987 Sec->setBeginSymbol(SectionStartSym); 988 } 989 bool InsertResult = getContext().addGenDwarfSection(Sec); 990 assert(InsertResult && ".text section should not have debug info yet"); 991 (void)InsertResult; 992 } 993 994 getTargetParser().onBeginOfFile(); 995 996 // While we have input, parse each statement. 997 while (Lexer.isNot(AsmToken::Eof)) { 998 ParseStatementInfo Info(&AsmStrRewrites); 999 bool Parsed = parseStatement(Info, nullptr); 1000 1001 // If we have a Lexer Error we are on an Error Token. Load in Lexer Error 1002 // for printing ErrMsg via Lex() only if no (presumably better) parser error 1003 // exists. 1004 if (Parsed && !hasPendingError() && Lexer.getTok().is(AsmToken::Error)) { 1005 Lex(); 1006 } 1007 1008 // parseStatement returned true so may need to emit an error. 1009 printPendingErrors(); 1010 1011 // Skipping to the next line if needed. 1012 if (Parsed && !getLexer().isAtStartOfStatement()) 1013 eatToEndOfStatement(); 1014 } 1015 1016 getTargetParser().onEndOfFile(); 1017 printPendingErrors(); 1018 1019 // All errors should have been emitted. 1020 assert(!hasPendingError() && "unexpected error from parseStatement"); 1021 1022 getTargetParser().flushPendingInstructions(getStreamer()); 1023 1024 if (TheCondState.TheCond != StartingCondState.TheCond || 1025 TheCondState.Ignore != StartingCondState.Ignore) 1026 printError(getTok().getLoc(), "unmatched .ifs or .elses"); 1027 // Check to see there are no empty DwarfFile slots. 1028 const auto &LineTables = getContext().getMCDwarfLineTables(); 1029 if (!LineTables.empty()) { 1030 unsigned Index = 0; 1031 for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) { 1032 if (File.Name.empty() && Index != 0) 1033 printError(getTok().getLoc(), "unassigned file number: " + 1034 Twine(Index) + 1035 " for .file directives"); 1036 ++Index; 1037 } 1038 } 1039 1040 // Check to see that all assembler local symbols were actually defined. 1041 // Targets that don't do subsections via symbols may not want this, though, 1042 // so conservatively exclude them. Only do this if we're finalizing, though, 1043 // as otherwise we won't necessarilly have seen everything yet. 1044 if (!NoFinalize) { 1045 if (MAI.hasSubsectionsViaSymbols()) { 1046 for (const auto &TableEntry : getContext().getSymbols()) { 1047 MCSymbol *Sym = TableEntry.getValue(); 1048 // Variable symbols may not be marked as defined, so check those 1049 // explicitly. If we know it's a variable, we have a definition for 1050 // the purposes of this check. 1051 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined()) 1052 // FIXME: We would really like to refer back to where the symbol was 1053 // first referenced for a source location. We need to add something 1054 // to track that. Currently, we just point to the end of the file. 1055 printError(getTok().getLoc(), "assembler local symbol '" + 1056 Sym->getName() + "' not defined"); 1057 } 1058 } 1059 1060 // Temporary symbols like the ones for directional jumps don't go in the 1061 // symbol table. They also need to be diagnosed in all (final) cases. 1062 for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) { 1063 if (std::get<2>(LocSym)->isUndefined()) { 1064 // Reset the state of any "# line file" directives we've seen to the 1065 // context as it was at the diagnostic site. 1066 CppHashInfo = std::get<1>(LocSym); 1067 printError(std::get<0>(LocSym), "directional label undefined"); 1068 } 1069 } 1070 } 1071 // Finalize the output stream if there are no errors and if the client wants 1072 // us to. 1073 if (!HadError && !NoFinalize) { 1074 if (auto *TS = Out.getTargetStreamer()) 1075 TS->emitConstantPools(); 1076 1077 Out.finish(Lexer.getLoc()); 1078 } 1079 1080 return HadError || getContext().hadError(); 1081 } 1082 1083 bool AsmParser::checkForValidSection() { 1084 if (!ParsingMSInlineAsm && !getStreamer().getCurrentSectionOnly()) { 1085 Out.initSections(false, getTargetParser().getSTI()); 1086 return Error(getTok().getLoc(), 1087 "expected section directive before assembly directive"); 1088 } 1089 return false; 1090 } 1091 1092 /// Throw away the rest of the line for testing purposes. 1093 void AsmParser::eatToEndOfStatement() { 1094 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 1095 Lexer.Lex(); 1096 1097 // Eat EOL. 1098 if (Lexer.is(AsmToken::EndOfStatement)) 1099 Lexer.Lex(); 1100 } 1101 1102 StringRef AsmParser::parseStringToEndOfStatement() { 1103 const char *Start = getTok().getLoc().getPointer(); 1104 1105 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 1106 Lexer.Lex(); 1107 1108 const char *End = getTok().getLoc().getPointer(); 1109 return StringRef(Start, End - Start); 1110 } 1111 1112 StringRef AsmParser::parseStringToComma() { 1113 const char *Start = getTok().getLoc().getPointer(); 1114 1115 while (Lexer.isNot(AsmToken::EndOfStatement) && 1116 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof)) 1117 Lexer.Lex(); 1118 1119 const char *End = getTok().getLoc().getPointer(); 1120 return StringRef(Start, End - Start); 1121 } 1122 1123 /// Parse a paren expression and return it. 1124 /// NOTE: This assumes the leading '(' has already been consumed. 1125 /// 1126 /// parenexpr ::= expr) 1127 /// 1128 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) { 1129 if (parseExpression(Res)) 1130 return true; 1131 EndLoc = Lexer.getTok().getEndLoc(); 1132 return parseRParen(); 1133 } 1134 1135 /// Parse a bracket expression and return it. 1136 /// NOTE: This assumes the leading '[' has already been consumed. 1137 /// 1138 /// bracketexpr ::= expr] 1139 /// 1140 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) { 1141 if (parseExpression(Res)) 1142 return true; 1143 EndLoc = getTok().getEndLoc(); 1144 if (parseToken(AsmToken::RBrac, "expected ']' in brackets expression")) 1145 return true; 1146 return false; 1147 } 1148 1149 /// Parse a primary expression and return it. 1150 /// primaryexpr ::= (parenexpr 1151 /// primaryexpr ::= symbol 1152 /// primaryexpr ::= number 1153 /// primaryexpr ::= '.' 1154 /// primaryexpr ::= ~,+,- primaryexpr 1155 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc, 1156 AsmTypeInfo *TypeInfo) { 1157 SMLoc FirstTokenLoc = getLexer().getLoc(); 1158 AsmToken::TokenKind FirstTokenKind = Lexer.getKind(); 1159 switch (FirstTokenKind) { 1160 default: 1161 return TokError("unknown token in expression"); 1162 // If we have an error assume that we've already handled it. 1163 case AsmToken::Error: 1164 return true; 1165 case AsmToken::Exclaim: 1166 Lex(); // Eat the operator. 1167 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1168 return true; 1169 Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc); 1170 return false; 1171 case AsmToken::Dollar: 1172 case AsmToken::Star: 1173 case AsmToken::At: 1174 case AsmToken::String: 1175 case AsmToken::Identifier: { 1176 StringRef Identifier; 1177 if (parseIdentifier(Identifier)) { 1178 // We may have failed but '$'|'*' may be a valid token in context of 1179 // the current PC. 1180 if (getTok().is(AsmToken::Dollar) || getTok().is(AsmToken::Star)) { 1181 bool ShouldGenerateTempSymbol = false; 1182 if ((getTok().is(AsmToken::Dollar) && MAI.getDollarIsPC()) || 1183 (getTok().is(AsmToken::Star) && MAI.getStarIsPC())) 1184 ShouldGenerateTempSymbol = true; 1185 1186 if (!ShouldGenerateTempSymbol) 1187 return Error(FirstTokenLoc, "invalid token in expression"); 1188 1189 // Eat the '$'|'*' token. 1190 Lex(); 1191 // This is either a '$'|'*' reference, which references the current PC. 1192 // Emit a temporary label to the streamer and refer to it. 1193 MCSymbol *Sym = Ctx.createTempSymbol(); 1194 Out.emitLabel(Sym); 1195 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, 1196 getContext()); 1197 EndLoc = FirstTokenLoc; 1198 return false; 1199 } 1200 } 1201 // Parse symbol variant 1202 std::pair<StringRef, StringRef> Split; 1203 if (!MAI.useParensForSymbolVariant()) { 1204 if (FirstTokenKind == AsmToken::String) { 1205 if (Lexer.is(AsmToken::At)) { 1206 Lex(); // eat @ 1207 SMLoc AtLoc = getLexer().getLoc(); 1208 StringRef VName; 1209 if (parseIdentifier(VName)) 1210 return Error(AtLoc, "expected symbol variant after '@'"); 1211 1212 Split = std::make_pair(Identifier, VName); 1213 } 1214 } else { 1215 Split = Identifier.split('@'); 1216 } 1217 } else if (Lexer.is(AsmToken::LParen)) { 1218 Lex(); // eat '('. 1219 StringRef VName; 1220 parseIdentifier(VName); 1221 if (parseRParen()) 1222 return true; 1223 Split = std::make_pair(Identifier, VName); 1224 } 1225 1226 EndLoc = SMLoc::getFromPointer(Identifier.end()); 1227 1228 // This is a symbol reference. 1229 StringRef SymbolName = Identifier; 1230 if (SymbolName.empty()) 1231 return Error(getLexer().getLoc(), "expected a symbol reference"); 1232 1233 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 1234 1235 // Lookup the symbol variant if used. 1236 if (!Split.second.empty()) { 1237 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 1238 if (Variant != MCSymbolRefExpr::VK_Invalid) { 1239 SymbolName = Split.first; 1240 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) { 1241 Variant = MCSymbolRefExpr::VK_None; 1242 } else { 1243 return Error(SMLoc::getFromPointer(Split.second.begin()), 1244 "invalid variant '" + Split.second + "'"); 1245 } 1246 } 1247 1248 MCSymbol *Sym = getContext().getInlineAsmLabel(SymbolName); 1249 if (!Sym) 1250 Sym = getContext().getOrCreateSymbol( 1251 MAI.shouldEmitLabelsInUpperCase() ? SymbolName.upper() : SymbolName); 1252 1253 // If this is an absolute variable reference, substitute it now to preserve 1254 // semantics in the face of reassignment. 1255 if (Sym->isVariable()) { 1256 auto V = Sym->getVariableValue(/*SetUsed*/ false); 1257 bool DoInline = isa<MCConstantExpr>(V) && !Variant; 1258 if (auto TV = dyn_cast<MCTargetExpr>(V)) 1259 DoInline = TV->inlineAssignedExpr(); 1260 if (DoInline) { 1261 if (Variant) 1262 return Error(EndLoc, "unexpected modifier on variable reference"); 1263 Res = Sym->getVariableValue(/*SetUsed*/ false); 1264 return false; 1265 } 1266 } 1267 1268 // Otherwise create a symbol ref. 1269 Res = MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc); 1270 return false; 1271 } 1272 case AsmToken::BigNum: 1273 return TokError("literal value out of range for directive"); 1274 case AsmToken::Integer: { 1275 SMLoc Loc = getTok().getLoc(); 1276 int64_t IntVal = getTok().getIntVal(); 1277 Res = MCConstantExpr::create(IntVal, getContext()); 1278 EndLoc = Lexer.getTok().getEndLoc(); 1279 Lex(); // Eat token. 1280 // Look for 'b' or 'f' following an Integer as a directional label 1281 if (Lexer.getKind() == AsmToken::Identifier) { 1282 StringRef IDVal = getTok().getString(); 1283 // Lookup the symbol variant if used. 1284 std::pair<StringRef, StringRef> Split = IDVal.split('@'); 1285 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 1286 if (Split.first.size() != IDVal.size()) { 1287 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 1288 if (Variant == MCSymbolRefExpr::VK_Invalid) 1289 return TokError("invalid variant '" + Split.second + "'"); 1290 IDVal = Split.first; 1291 } 1292 if (IDVal == "f" || IDVal == "b") { 1293 MCSymbol *Sym = 1294 Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b"); 1295 Res = MCSymbolRefExpr::create(Sym, Variant, getContext()); 1296 if (IDVal == "b" && Sym->isUndefined()) 1297 return Error(Loc, "directional label undefined"); 1298 DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym)); 1299 EndLoc = Lexer.getTok().getEndLoc(); 1300 Lex(); // Eat identifier. 1301 } 1302 } 1303 return false; 1304 } 1305 case AsmToken::Real: { 1306 APFloat RealVal(APFloat::IEEEdouble(), getTok().getString()); 1307 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue(); 1308 Res = MCConstantExpr::create(IntVal, getContext()); 1309 EndLoc = Lexer.getTok().getEndLoc(); 1310 Lex(); // Eat token. 1311 return false; 1312 } 1313 case AsmToken::Dot: { 1314 if (!MAI.getDotIsPC()) 1315 return TokError("cannot use . as current PC"); 1316 1317 // This is a '.' reference, which references the current PC. Emit a 1318 // temporary label to the streamer and refer to it. 1319 MCSymbol *Sym = Ctx.createTempSymbol(); 1320 Out.emitLabel(Sym); 1321 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext()); 1322 EndLoc = Lexer.getTok().getEndLoc(); 1323 Lex(); // Eat identifier. 1324 return false; 1325 } 1326 case AsmToken::LParen: 1327 Lex(); // Eat the '('. 1328 return parseParenExpr(Res, EndLoc); 1329 case AsmToken::LBrac: 1330 if (!PlatformParser->HasBracketExpressions()) 1331 return TokError("brackets expression not supported on this target"); 1332 Lex(); // Eat the '['. 1333 return parseBracketExpr(Res, EndLoc); 1334 case AsmToken::Minus: 1335 Lex(); // Eat the operator. 1336 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1337 return true; 1338 Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc); 1339 return false; 1340 case AsmToken::Plus: 1341 Lex(); // Eat the operator. 1342 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1343 return true; 1344 Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc); 1345 return false; 1346 case AsmToken::Tilde: 1347 Lex(); // Eat the operator. 1348 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1349 return true; 1350 Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc); 1351 return false; 1352 // MIPS unary expression operators. The lexer won't generate these tokens if 1353 // MCAsmInfo::HasMipsExpressions is false for the target. 1354 case AsmToken::PercentCall16: 1355 case AsmToken::PercentCall_Hi: 1356 case AsmToken::PercentCall_Lo: 1357 case AsmToken::PercentDtprel_Hi: 1358 case AsmToken::PercentDtprel_Lo: 1359 case AsmToken::PercentGot: 1360 case AsmToken::PercentGot_Disp: 1361 case AsmToken::PercentGot_Hi: 1362 case AsmToken::PercentGot_Lo: 1363 case AsmToken::PercentGot_Ofst: 1364 case AsmToken::PercentGot_Page: 1365 case AsmToken::PercentGottprel: 1366 case AsmToken::PercentGp_Rel: 1367 case AsmToken::PercentHi: 1368 case AsmToken::PercentHigher: 1369 case AsmToken::PercentHighest: 1370 case AsmToken::PercentLo: 1371 case AsmToken::PercentNeg: 1372 case AsmToken::PercentPcrel_Hi: 1373 case AsmToken::PercentPcrel_Lo: 1374 case AsmToken::PercentTlsgd: 1375 case AsmToken::PercentTlsldm: 1376 case AsmToken::PercentTprel_Hi: 1377 case AsmToken::PercentTprel_Lo: 1378 Lex(); // Eat the operator. 1379 if (Lexer.isNot(AsmToken::LParen)) 1380 return TokError("expected '(' after operator"); 1381 Lex(); // Eat the operator. 1382 if (parseExpression(Res, EndLoc)) 1383 return true; 1384 if (parseRParen()) 1385 return true; 1386 Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx); 1387 return !Res; 1388 } 1389 } 1390 1391 bool AsmParser::parseExpression(const MCExpr *&Res) { 1392 SMLoc EndLoc; 1393 return parseExpression(Res, EndLoc); 1394 } 1395 1396 const MCExpr * 1397 AsmParser::applyModifierToExpr(const MCExpr *E, 1398 MCSymbolRefExpr::VariantKind Variant) { 1399 // Ask the target implementation about this expression first. 1400 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx); 1401 if (NewE) 1402 return NewE; 1403 // Recurse over the given expression, rebuilding it to apply the given variant 1404 // if there is exactly one symbol. 1405 switch (E->getKind()) { 1406 case MCExpr::Target: 1407 case MCExpr::Constant: 1408 return nullptr; 1409 1410 case MCExpr::SymbolRef: { 1411 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E); 1412 1413 if (SRE->getKind() != MCSymbolRefExpr::VK_None) { 1414 TokError("invalid variant on expression '" + getTok().getIdentifier() + 1415 "' (already modified)"); 1416 return E; 1417 } 1418 1419 return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext()); 1420 } 1421 1422 case MCExpr::Unary: { 1423 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E); 1424 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant); 1425 if (!Sub) 1426 return nullptr; 1427 return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext()); 1428 } 1429 1430 case MCExpr::Binary: { 1431 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E); 1432 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant); 1433 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant); 1434 1435 if (!LHS && !RHS) 1436 return nullptr; 1437 1438 if (!LHS) 1439 LHS = BE->getLHS(); 1440 if (!RHS) 1441 RHS = BE->getRHS(); 1442 1443 return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext()); 1444 } 1445 } 1446 1447 llvm_unreachable("Invalid expression kind!"); 1448 } 1449 1450 /// This function checks if the next token is <string> type or arithmetic. 1451 /// string that begin with character '<' must end with character '>'. 1452 /// otherwise it is arithmetics. 1453 /// If the function returns a 'true' value, 1454 /// the End argument will be filled with the last location pointed to the '>' 1455 /// character. 1456 1457 /// There is a gap between the AltMacro's documentation and the single quote 1458 /// implementation. GCC does not fully support this feature and so we will not 1459 /// support it. 1460 /// TODO: Adding single quote as a string. 1461 static bool isAngleBracketString(SMLoc &StrLoc, SMLoc &EndLoc) { 1462 assert((StrLoc.getPointer() != nullptr) && 1463 "Argument to the function cannot be a NULL value"); 1464 const char *CharPtr = StrLoc.getPointer(); 1465 while ((*CharPtr != '>') && (*CharPtr != '\n') && (*CharPtr != '\r') && 1466 (*CharPtr != '\0')) { 1467 if (*CharPtr == '!') 1468 CharPtr++; 1469 CharPtr++; 1470 } 1471 if (*CharPtr == '>') { 1472 EndLoc = StrLoc.getFromPointer(CharPtr + 1); 1473 return true; 1474 } 1475 return false; 1476 } 1477 1478 /// creating a string without the escape characters '!'. 1479 static std::string angleBracketString(StringRef AltMacroStr) { 1480 std::string Res; 1481 for (size_t Pos = 0; Pos < AltMacroStr.size(); Pos++) { 1482 if (AltMacroStr[Pos] == '!') 1483 Pos++; 1484 Res += AltMacroStr[Pos]; 1485 } 1486 return Res; 1487 } 1488 1489 /// Parse an expression and return it. 1490 /// 1491 /// expr ::= expr &&,|| expr -> lowest. 1492 /// expr ::= expr |,^,&,! expr 1493 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr 1494 /// expr ::= expr <<,>> expr 1495 /// expr ::= expr +,- expr 1496 /// expr ::= expr *,/,% expr -> highest. 1497 /// expr ::= primaryexpr 1498 /// 1499 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1500 // Parse the expression. 1501 Res = nullptr; 1502 if (getTargetParser().parsePrimaryExpr(Res, EndLoc) || 1503 parseBinOpRHS(1, Res, EndLoc)) 1504 return true; 1505 1506 // As a special case, we support 'a op b @ modifier' by rewriting the 1507 // expression to include the modifier. This is inefficient, but in general we 1508 // expect users to use 'a@modifier op b'. 1509 if (Lexer.getKind() == AsmToken::At) { 1510 Lex(); 1511 1512 if (Lexer.isNot(AsmToken::Identifier)) 1513 return TokError("unexpected symbol modifier following '@'"); 1514 1515 MCSymbolRefExpr::VariantKind Variant = 1516 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier()); 1517 if (Variant == MCSymbolRefExpr::VK_Invalid) 1518 return TokError("invalid variant '" + getTok().getIdentifier() + "'"); 1519 1520 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant); 1521 if (!ModifiedRes) { 1522 return TokError("invalid modifier '" + getTok().getIdentifier() + 1523 "' (no symbols present)"); 1524 } 1525 1526 Res = ModifiedRes; 1527 Lex(); 1528 } 1529 1530 // Try to constant fold it up front, if possible. Do not exploit 1531 // assembler here. 1532 int64_t Value; 1533 if (Res->evaluateAsAbsolute(Value)) 1534 Res = MCConstantExpr::create(Value, getContext()); 1535 1536 return false; 1537 } 1538 1539 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1540 Res = nullptr; 1541 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc); 1542 } 1543 1544 bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 1545 SMLoc &EndLoc) { 1546 if (parseParenExpr(Res, EndLoc)) 1547 return true; 1548 1549 for (; ParenDepth > 0; --ParenDepth) { 1550 if (parseBinOpRHS(1, Res, EndLoc)) 1551 return true; 1552 1553 // We don't Lex() the last RParen. 1554 // This is the same behavior as parseParenExpression(). 1555 if (ParenDepth - 1 > 0) { 1556 EndLoc = getTok().getEndLoc(); 1557 if (parseRParen()) 1558 return true; 1559 } 1560 } 1561 return false; 1562 } 1563 1564 bool AsmParser::parseAbsoluteExpression(int64_t &Res) { 1565 const MCExpr *Expr; 1566 1567 SMLoc StartLoc = Lexer.getLoc(); 1568 if (parseExpression(Expr)) 1569 return true; 1570 1571 if (!Expr->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr())) 1572 return Error(StartLoc, "expected absolute expression"); 1573 1574 return false; 1575 } 1576 1577 static unsigned getDarwinBinOpPrecedence(AsmToken::TokenKind K, 1578 MCBinaryExpr::Opcode &Kind, 1579 bool ShouldUseLogicalShr) { 1580 switch (K) { 1581 default: 1582 return 0; // not a binop. 1583 1584 // Lowest Precedence: &&, || 1585 case AsmToken::AmpAmp: 1586 Kind = MCBinaryExpr::LAnd; 1587 return 1; 1588 case AsmToken::PipePipe: 1589 Kind = MCBinaryExpr::LOr; 1590 return 1; 1591 1592 // Low Precedence: |, &, ^ 1593 case AsmToken::Pipe: 1594 Kind = MCBinaryExpr::Or; 1595 return 2; 1596 case AsmToken::Caret: 1597 Kind = MCBinaryExpr::Xor; 1598 return 2; 1599 case AsmToken::Amp: 1600 Kind = MCBinaryExpr::And; 1601 return 2; 1602 1603 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >= 1604 case AsmToken::EqualEqual: 1605 Kind = MCBinaryExpr::EQ; 1606 return 3; 1607 case AsmToken::ExclaimEqual: 1608 case AsmToken::LessGreater: 1609 Kind = MCBinaryExpr::NE; 1610 return 3; 1611 case AsmToken::Less: 1612 Kind = MCBinaryExpr::LT; 1613 return 3; 1614 case AsmToken::LessEqual: 1615 Kind = MCBinaryExpr::LTE; 1616 return 3; 1617 case AsmToken::Greater: 1618 Kind = MCBinaryExpr::GT; 1619 return 3; 1620 case AsmToken::GreaterEqual: 1621 Kind = MCBinaryExpr::GTE; 1622 return 3; 1623 1624 // Intermediate Precedence: <<, >> 1625 case AsmToken::LessLess: 1626 Kind = MCBinaryExpr::Shl; 1627 return 4; 1628 case AsmToken::GreaterGreater: 1629 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1630 return 4; 1631 1632 // High Intermediate Precedence: +, - 1633 case AsmToken::Plus: 1634 Kind = MCBinaryExpr::Add; 1635 return 5; 1636 case AsmToken::Minus: 1637 Kind = MCBinaryExpr::Sub; 1638 return 5; 1639 1640 // Highest Precedence: *, /, % 1641 case AsmToken::Star: 1642 Kind = MCBinaryExpr::Mul; 1643 return 6; 1644 case AsmToken::Slash: 1645 Kind = MCBinaryExpr::Div; 1646 return 6; 1647 case AsmToken::Percent: 1648 Kind = MCBinaryExpr::Mod; 1649 return 6; 1650 } 1651 } 1652 1653 static unsigned getGNUBinOpPrecedence(const MCAsmInfo &MAI, 1654 AsmToken::TokenKind K, 1655 MCBinaryExpr::Opcode &Kind, 1656 bool ShouldUseLogicalShr) { 1657 switch (K) { 1658 default: 1659 return 0; // not a binop. 1660 1661 // Lowest Precedence: &&, || 1662 case AsmToken::AmpAmp: 1663 Kind = MCBinaryExpr::LAnd; 1664 return 2; 1665 case AsmToken::PipePipe: 1666 Kind = MCBinaryExpr::LOr; 1667 return 1; 1668 1669 // Low Precedence: ==, !=, <>, <, <=, >, >= 1670 case AsmToken::EqualEqual: 1671 Kind = MCBinaryExpr::EQ; 1672 return 3; 1673 case AsmToken::ExclaimEqual: 1674 case AsmToken::LessGreater: 1675 Kind = MCBinaryExpr::NE; 1676 return 3; 1677 case AsmToken::Less: 1678 Kind = MCBinaryExpr::LT; 1679 return 3; 1680 case AsmToken::LessEqual: 1681 Kind = MCBinaryExpr::LTE; 1682 return 3; 1683 case AsmToken::Greater: 1684 Kind = MCBinaryExpr::GT; 1685 return 3; 1686 case AsmToken::GreaterEqual: 1687 Kind = MCBinaryExpr::GTE; 1688 return 3; 1689 1690 // Low Intermediate Precedence: +, - 1691 case AsmToken::Plus: 1692 Kind = MCBinaryExpr::Add; 1693 return 4; 1694 case AsmToken::Minus: 1695 Kind = MCBinaryExpr::Sub; 1696 return 4; 1697 1698 // High Intermediate Precedence: |, !, &, ^ 1699 // 1700 case AsmToken::Pipe: 1701 Kind = MCBinaryExpr::Or; 1702 return 5; 1703 case AsmToken::Exclaim: 1704 // Hack to support ARM compatible aliases (implied 'sp' operand in 'srs*' 1705 // instructions like 'srsda #31!') and not parse ! as an infix operator. 1706 if (MAI.getCommentString() == "@") 1707 return 0; 1708 Kind = MCBinaryExpr::OrNot; 1709 return 5; 1710 case AsmToken::Caret: 1711 Kind = MCBinaryExpr::Xor; 1712 return 5; 1713 case AsmToken::Amp: 1714 Kind = MCBinaryExpr::And; 1715 return 5; 1716 1717 // Highest Precedence: *, /, %, <<, >> 1718 case AsmToken::Star: 1719 Kind = MCBinaryExpr::Mul; 1720 return 6; 1721 case AsmToken::Slash: 1722 Kind = MCBinaryExpr::Div; 1723 return 6; 1724 case AsmToken::Percent: 1725 Kind = MCBinaryExpr::Mod; 1726 return 6; 1727 case AsmToken::LessLess: 1728 Kind = MCBinaryExpr::Shl; 1729 return 6; 1730 case AsmToken::GreaterGreater: 1731 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1732 return 6; 1733 } 1734 } 1735 1736 unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K, 1737 MCBinaryExpr::Opcode &Kind) { 1738 bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr(); 1739 return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr) 1740 : getGNUBinOpPrecedence(MAI, K, Kind, ShouldUseLogicalShr); 1741 } 1742 1743 /// Parse all binary operators with precedence >= 'Precedence'. 1744 /// Res contains the LHS of the expression on input. 1745 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, 1746 SMLoc &EndLoc) { 1747 SMLoc StartLoc = Lexer.getLoc(); 1748 while (true) { 1749 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add; 1750 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind); 1751 1752 // If the next token is lower precedence than we are allowed to eat, return 1753 // successfully with what we ate already. 1754 if (TokPrec < Precedence) 1755 return false; 1756 1757 Lex(); 1758 1759 // Eat the next primary expression. 1760 const MCExpr *RHS; 1761 if (getTargetParser().parsePrimaryExpr(RHS, EndLoc)) 1762 return true; 1763 1764 // If BinOp binds less tightly with RHS than the operator after RHS, let 1765 // the pending operator take RHS as its LHS. 1766 MCBinaryExpr::Opcode Dummy; 1767 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy); 1768 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc)) 1769 return true; 1770 1771 // Merge LHS and RHS according to operator. 1772 Res = MCBinaryExpr::create(Kind, Res, RHS, getContext(), StartLoc); 1773 } 1774 } 1775 1776 /// ParseStatement: 1777 /// ::= EndOfStatement 1778 /// ::= Label* Directive ...Operands... EndOfStatement 1779 /// ::= Label* Identifier OperandList* EndOfStatement 1780 bool AsmParser::parseStatement(ParseStatementInfo &Info, 1781 MCAsmParserSemaCallback *SI) { 1782 assert(!hasPendingError() && "parseStatement started with pending error"); 1783 // Eat initial spaces and comments 1784 while (Lexer.is(AsmToken::Space)) 1785 Lex(); 1786 if (Lexer.is(AsmToken::EndOfStatement)) { 1787 // if this is a line comment we can drop it safely 1788 if (getTok().getString().empty() || getTok().getString().front() == '\r' || 1789 getTok().getString().front() == '\n') 1790 Out.addBlankLine(); 1791 Lex(); 1792 return false; 1793 } 1794 // Statements always start with an identifier. 1795 AsmToken ID = getTok(); 1796 SMLoc IDLoc = ID.getLoc(); 1797 StringRef IDVal; 1798 int64_t LocalLabelVal = -1; 1799 StartTokLoc = ID.getLoc(); 1800 if (Lexer.is(AsmToken::HashDirective)) 1801 return parseCppHashLineFilenameComment(IDLoc, 1802 !isInsideMacroInstantiation()); 1803 1804 // Allow an integer followed by a ':' as a directional local label. 1805 if (Lexer.is(AsmToken::Integer)) { 1806 LocalLabelVal = getTok().getIntVal(); 1807 if (LocalLabelVal < 0) { 1808 if (!TheCondState.Ignore) { 1809 Lex(); // always eat a token 1810 return Error(IDLoc, "unexpected token at start of statement"); 1811 } 1812 IDVal = ""; 1813 } else { 1814 IDVal = getTok().getString(); 1815 Lex(); // Consume the integer token to be used as an identifier token. 1816 if (Lexer.getKind() != AsmToken::Colon) { 1817 if (!TheCondState.Ignore) { 1818 Lex(); // always eat a token 1819 return Error(IDLoc, "unexpected token at start of statement"); 1820 } 1821 } 1822 } 1823 } else if (Lexer.is(AsmToken::Dot)) { 1824 // Treat '.' as a valid identifier in this context. 1825 Lex(); 1826 IDVal = "."; 1827 } else if (Lexer.is(AsmToken::LCurly)) { 1828 // Treat '{' as a valid identifier in this context. 1829 Lex(); 1830 IDVal = "{"; 1831 1832 } else if (Lexer.is(AsmToken::RCurly)) { 1833 // Treat '}' as a valid identifier in this context. 1834 Lex(); 1835 IDVal = "}"; 1836 } else if (Lexer.is(AsmToken::Star) && 1837 getTargetParser().starIsStartOfStatement()) { 1838 // Accept '*' as a valid start of statement. 1839 Lex(); 1840 IDVal = "*"; 1841 } else if (parseIdentifier(IDVal)) { 1842 if (!TheCondState.Ignore) { 1843 Lex(); // always eat a token 1844 return Error(IDLoc, "unexpected token at start of statement"); 1845 } 1846 IDVal = ""; 1847 } 1848 1849 // Handle conditional assembly here before checking for skipping. We 1850 // have to do this so that .endif isn't skipped in a ".if 0" block for 1851 // example. 1852 StringMap<DirectiveKind>::const_iterator DirKindIt = 1853 DirectiveKindMap.find(IDVal.lower()); 1854 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end()) 1855 ? DK_NO_DIRECTIVE 1856 : DirKindIt->getValue(); 1857 switch (DirKind) { 1858 default: 1859 break; 1860 case DK_IF: 1861 case DK_IFEQ: 1862 case DK_IFGE: 1863 case DK_IFGT: 1864 case DK_IFLE: 1865 case DK_IFLT: 1866 case DK_IFNE: 1867 return parseDirectiveIf(IDLoc, DirKind); 1868 case DK_IFB: 1869 return parseDirectiveIfb(IDLoc, true); 1870 case DK_IFNB: 1871 return parseDirectiveIfb(IDLoc, false); 1872 case DK_IFC: 1873 return parseDirectiveIfc(IDLoc, true); 1874 case DK_IFEQS: 1875 return parseDirectiveIfeqs(IDLoc, true); 1876 case DK_IFNC: 1877 return parseDirectiveIfc(IDLoc, false); 1878 case DK_IFNES: 1879 return parseDirectiveIfeqs(IDLoc, false); 1880 case DK_IFDEF: 1881 return parseDirectiveIfdef(IDLoc, true); 1882 case DK_IFNDEF: 1883 case DK_IFNOTDEF: 1884 return parseDirectiveIfdef(IDLoc, false); 1885 case DK_ELSEIF: 1886 return parseDirectiveElseIf(IDLoc); 1887 case DK_ELSE: 1888 return parseDirectiveElse(IDLoc); 1889 case DK_ENDIF: 1890 return parseDirectiveEndIf(IDLoc); 1891 } 1892 1893 // Ignore the statement if in the middle of inactive conditional 1894 // (e.g. ".if 0"). 1895 if (TheCondState.Ignore) { 1896 eatToEndOfStatement(); 1897 return false; 1898 } 1899 1900 // FIXME: Recurse on local labels? 1901 1902 // See what kind of statement we have. 1903 switch (Lexer.getKind()) { 1904 case AsmToken::Colon: { 1905 if (!getTargetParser().isLabel(ID)) 1906 break; 1907 if (checkForValidSection()) 1908 return true; 1909 1910 // identifier ':' -> Label. 1911 Lex(); 1912 1913 // Diagnose attempt to use '.' as a label. 1914 if (IDVal == ".") 1915 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label"); 1916 1917 // Diagnose attempt to use a variable as a label. 1918 // 1919 // FIXME: Diagnostics. Note the location of the definition as a label. 1920 // FIXME: This doesn't diagnose assignment to a symbol which has been 1921 // implicitly marked as external. 1922 MCSymbol *Sym; 1923 if (LocalLabelVal == -1) { 1924 if (ParsingMSInlineAsm && SI) { 1925 StringRef RewrittenLabel = 1926 SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true); 1927 assert(!RewrittenLabel.empty() && 1928 "We should have an internal name here."); 1929 Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(), 1930 RewrittenLabel); 1931 IDVal = RewrittenLabel; 1932 } 1933 Sym = getContext().getOrCreateSymbol(IDVal); 1934 } else 1935 Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal); 1936 // End of Labels should be treated as end of line for lexing 1937 // purposes but that information is not available to the Lexer who 1938 // does not understand Labels. This may cause us to see a Hash 1939 // here instead of a preprocessor line comment. 1940 if (getTok().is(AsmToken::Hash)) { 1941 StringRef CommentStr = parseStringToEndOfStatement(); 1942 Lexer.Lex(); 1943 Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr)); 1944 } 1945 1946 // Consume any end of statement token, if present, to avoid spurious 1947 // addBlankLine calls(). 1948 if (getTok().is(AsmToken::EndOfStatement)) { 1949 Lex(); 1950 } 1951 1952 if (discardLTOSymbol(IDVal)) 1953 return false; 1954 1955 getTargetParser().doBeforeLabelEmit(Sym); 1956 1957 // Emit the label. 1958 if (!getTargetParser().isParsingMSInlineAsm()) 1959 Out.emitLabel(Sym, IDLoc); 1960 1961 // If we are generating dwarf for assembly source files then gather the 1962 // info to make a dwarf label entry for this label if needed. 1963 if (enabledGenDwarfForAssembly()) 1964 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), 1965 IDLoc); 1966 1967 getTargetParser().onLabelParsed(Sym); 1968 1969 return false; 1970 } 1971 1972 case AsmToken::Equal: 1973 if (!getTargetParser().equalIsAsmAssignment()) 1974 break; 1975 // identifier '=' ... -> assignment statement 1976 Lex(); 1977 1978 return parseAssignment(IDVal, AssignmentKind::Equal); 1979 1980 default: // Normal instruction or directive. 1981 break; 1982 } 1983 1984 // If macros are enabled, check to see if this is a macro instantiation. 1985 if (areMacrosEnabled()) 1986 if (const MCAsmMacro *M = getContext().lookupMacro(IDVal)) { 1987 return handleMacroEntry(M, IDLoc); 1988 } 1989 1990 // Otherwise, we have a normal instruction or directive. 1991 1992 // Directives start with "." 1993 if (IDVal.startswith(".") && IDVal != ".") { 1994 // There are several entities interested in parsing directives: 1995 // 1996 // 1. The target-specific assembly parser. Some directives are target 1997 // specific or may potentially behave differently on certain targets. 1998 // 2. Asm parser extensions. For example, platform-specific parsers 1999 // (like the ELF parser) register themselves as extensions. 2000 // 3. The generic directive parser implemented by this class. These are 2001 // all the directives that behave in a target and platform independent 2002 // manner, or at least have a default behavior that's shared between 2003 // all targets and platforms. 2004 2005 getTargetParser().flushPendingInstructions(getStreamer()); 2006 2007 SMLoc StartTokLoc = getTok().getLoc(); 2008 bool TPDirectiveReturn = getTargetParser().ParseDirective(ID); 2009 2010 if (hasPendingError()) 2011 return true; 2012 // Currently the return value should be true if we are 2013 // uninterested but as this is at odds with the standard parsing 2014 // convention (return true = error) we have instances of a parsed 2015 // directive that fails returning true as an error. Catch these 2016 // cases as best as possible errors here. 2017 if (TPDirectiveReturn && StartTokLoc != getTok().getLoc()) 2018 return true; 2019 // Return if we did some parsing or believe we succeeded. 2020 if (!TPDirectiveReturn || StartTokLoc != getTok().getLoc()) 2021 return false; 2022 2023 // Next, check the extension directive map to see if any extension has 2024 // registered itself to parse this directive. 2025 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler = 2026 ExtensionDirectiveMap.lookup(IDVal); 2027 if (Handler.first) 2028 return (*Handler.second)(Handler.first, IDVal, IDLoc); 2029 2030 // Finally, if no one else is interested in this directive, it must be 2031 // generic and familiar to this class. 2032 switch (DirKind) { 2033 default: 2034 break; 2035 case DK_SET: 2036 case DK_EQU: 2037 return parseDirectiveSet(IDVal, AssignmentKind::Set); 2038 case DK_EQUIV: 2039 return parseDirectiveSet(IDVal, AssignmentKind::Equiv); 2040 case DK_LTO_SET_CONDITIONAL: 2041 return parseDirectiveSet(IDVal, AssignmentKind::LTOSetConditional); 2042 case DK_ASCII: 2043 return parseDirectiveAscii(IDVal, false); 2044 case DK_ASCIZ: 2045 case DK_STRING: 2046 return parseDirectiveAscii(IDVal, true); 2047 case DK_BYTE: 2048 case DK_DC_B: 2049 return parseDirectiveValue(IDVal, 1); 2050 case DK_DC: 2051 case DK_DC_W: 2052 case DK_SHORT: 2053 case DK_VALUE: 2054 case DK_2BYTE: 2055 return parseDirectiveValue(IDVal, 2); 2056 case DK_LONG: 2057 case DK_INT: 2058 case DK_4BYTE: 2059 case DK_DC_L: 2060 return parseDirectiveValue(IDVal, 4); 2061 case DK_QUAD: 2062 case DK_8BYTE: 2063 return parseDirectiveValue(IDVal, 8); 2064 case DK_DC_A: 2065 return parseDirectiveValue( 2066 IDVal, getContext().getAsmInfo()->getCodePointerSize()); 2067 case DK_OCTA: 2068 return parseDirectiveOctaValue(IDVal); 2069 case DK_SINGLE: 2070 case DK_FLOAT: 2071 case DK_DC_S: 2072 return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle()); 2073 case DK_DOUBLE: 2074 case DK_DC_D: 2075 return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble()); 2076 case DK_ALIGN: { 2077 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 2078 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1); 2079 } 2080 case DK_ALIGN32: { 2081 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 2082 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4); 2083 } 2084 case DK_BALIGN: 2085 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); 2086 case DK_BALIGNW: 2087 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); 2088 case DK_BALIGNL: 2089 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); 2090 case DK_P2ALIGN: 2091 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); 2092 case DK_P2ALIGNW: 2093 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); 2094 case DK_P2ALIGNL: 2095 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); 2096 case DK_ORG: 2097 return parseDirectiveOrg(); 2098 case DK_FILL: 2099 return parseDirectiveFill(); 2100 case DK_ZERO: 2101 return parseDirectiveZero(); 2102 case DK_EXTERN: 2103 eatToEndOfStatement(); // .extern is the default, ignore it. 2104 return false; 2105 case DK_GLOBL: 2106 case DK_GLOBAL: 2107 return parseDirectiveSymbolAttribute(MCSA_Global); 2108 case DK_LAZY_REFERENCE: 2109 return parseDirectiveSymbolAttribute(MCSA_LazyReference); 2110 case DK_NO_DEAD_STRIP: 2111 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip); 2112 case DK_SYMBOL_RESOLVER: 2113 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver); 2114 case DK_PRIVATE_EXTERN: 2115 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern); 2116 case DK_REFERENCE: 2117 return parseDirectiveSymbolAttribute(MCSA_Reference); 2118 case DK_WEAK_DEFINITION: 2119 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition); 2120 case DK_WEAK_REFERENCE: 2121 return parseDirectiveSymbolAttribute(MCSA_WeakReference); 2122 case DK_WEAK_DEF_CAN_BE_HIDDEN: 2123 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); 2124 case DK_COLD: 2125 return parseDirectiveSymbolAttribute(MCSA_Cold); 2126 case DK_COMM: 2127 case DK_COMMON: 2128 return parseDirectiveComm(/*IsLocal=*/false); 2129 case DK_LCOMM: 2130 return parseDirectiveComm(/*IsLocal=*/true); 2131 case DK_ABORT: 2132 return parseDirectiveAbort(); 2133 case DK_INCLUDE: 2134 return parseDirectiveInclude(); 2135 case DK_INCBIN: 2136 return parseDirectiveIncbin(); 2137 case DK_CODE16: 2138 case DK_CODE16GCC: 2139 return TokError(Twine(IDVal) + 2140 " not currently supported for this target"); 2141 case DK_REPT: 2142 return parseDirectiveRept(IDLoc, IDVal); 2143 case DK_IRP: 2144 return parseDirectiveIrp(IDLoc); 2145 case DK_IRPC: 2146 return parseDirectiveIrpc(IDLoc); 2147 case DK_ENDR: 2148 return parseDirectiveEndr(IDLoc); 2149 case DK_BUNDLE_ALIGN_MODE: 2150 return parseDirectiveBundleAlignMode(); 2151 case DK_BUNDLE_LOCK: 2152 return parseDirectiveBundleLock(); 2153 case DK_BUNDLE_UNLOCK: 2154 return parseDirectiveBundleUnlock(); 2155 case DK_SLEB128: 2156 return parseDirectiveLEB128(true); 2157 case DK_ULEB128: 2158 return parseDirectiveLEB128(false); 2159 case DK_SPACE: 2160 case DK_SKIP: 2161 return parseDirectiveSpace(IDVal); 2162 case DK_FILE: 2163 return parseDirectiveFile(IDLoc); 2164 case DK_LINE: 2165 return parseDirectiveLine(); 2166 case DK_LOC: 2167 return parseDirectiveLoc(); 2168 case DK_STABS: 2169 return parseDirectiveStabs(); 2170 case DK_CV_FILE: 2171 return parseDirectiveCVFile(); 2172 case DK_CV_FUNC_ID: 2173 return parseDirectiveCVFuncId(); 2174 case DK_CV_INLINE_SITE_ID: 2175 return parseDirectiveCVInlineSiteId(); 2176 case DK_CV_LOC: 2177 return parseDirectiveCVLoc(); 2178 case DK_CV_LINETABLE: 2179 return parseDirectiveCVLinetable(); 2180 case DK_CV_INLINE_LINETABLE: 2181 return parseDirectiveCVInlineLinetable(); 2182 case DK_CV_DEF_RANGE: 2183 return parseDirectiveCVDefRange(); 2184 case DK_CV_STRING: 2185 return parseDirectiveCVString(); 2186 case DK_CV_STRINGTABLE: 2187 return parseDirectiveCVStringTable(); 2188 case DK_CV_FILECHECKSUMS: 2189 return parseDirectiveCVFileChecksums(); 2190 case DK_CV_FILECHECKSUM_OFFSET: 2191 return parseDirectiveCVFileChecksumOffset(); 2192 case DK_CV_FPO_DATA: 2193 return parseDirectiveCVFPOData(); 2194 case DK_CFI_SECTIONS: 2195 return parseDirectiveCFISections(); 2196 case DK_CFI_STARTPROC: 2197 return parseDirectiveCFIStartProc(); 2198 case DK_CFI_ENDPROC: 2199 return parseDirectiveCFIEndProc(); 2200 case DK_CFI_DEF_CFA: 2201 return parseDirectiveCFIDefCfa(IDLoc); 2202 case DK_CFI_DEF_CFA_OFFSET: 2203 return parseDirectiveCFIDefCfaOffset(); 2204 case DK_CFI_ADJUST_CFA_OFFSET: 2205 return parseDirectiveCFIAdjustCfaOffset(); 2206 case DK_CFI_DEF_CFA_REGISTER: 2207 return parseDirectiveCFIDefCfaRegister(IDLoc); 2208 case DK_CFI_LLVM_DEF_ASPACE_CFA: 2209 return parseDirectiveCFILLVMDefAspaceCfa(IDLoc); 2210 case DK_CFI_OFFSET: 2211 return parseDirectiveCFIOffset(IDLoc); 2212 case DK_CFI_REL_OFFSET: 2213 return parseDirectiveCFIRelOffset(IDLoc); 2214 case DK_CFI_PERSONALITY: 2215 return parseDirectiveCFIPersonalityOrLsda(true); 2216 case DK_CFI_LSDA: 2217 return parseDirectiveCFIPersonalityOrLsda(false); 2218 case DK_CFI_REMEMBER_STATE: 2219 return parseDirectiveCFIRememberState(); 2220 case DK_CFI_RESTORE_STATE: 2221 return parseDirectiveCFIRestoreState(); 2222 case DK_CFI_SAME_VALUE: 2223 return parseDirectiveCFISameValue(IDLoc); 2224 case DK_CFI_RESTORE: 2225 return parseDirectiveCFIRestore(IDLoc); 2226 case DK_CFI_ESCAPE: 2227 return parseDirectiveCFIEscape(); 2228 case DK_CFI_RETURN_COLUMN: 2229 return parseDirectiveCFIReturnColumn(IDLoc); 2230 case DK_CFI_SIGNAL_FRAME: 2231 return parseDirectiveCFISignalFrame(); 2232 case DK_CFI_UNDEFINED: 2233 return parseDirectiveCFIUndefined(IDLoc); 2234 case DK_CFI_REGISTER: 2235 return parseDirectiveCFIRegister(IDLoc); 2236 case DK_CFI_WINDOW_SAVE: 2237 return parseDirectiveCFIWindowSave(); 2238 case DK_MACROS_ON: 2239 case DK_MACROS_OFF: 2240 return parseDirectiveMacrosOnOff(IDVal); 2241 case DK_MACRO: 2242 return parseDirectiveMacro(IDLoc); 2243 case DK_ALTMACRO: 2244 case DK_NOALTMACRO: 2245 return parseDirectiveAltmacro(IDVal); 2246 case DK_EXITM: 2247 return parseDirectiveExitMacro(IDVal); 2248 case DK_ENDM: 2249 case DK_ENDMACRO: 2250 return parseDirectiveEndMacro(IDVal); 2251 case DK_PURGEM: 2252 return parseDirectivePurgeMacro(IDLoc); 2253 case DK_END: 2254 return parseDirectiveEnd(IDLoc); 2255 case DK_ERR: 2256 return parseDirectiveError(IDLoc, false); 2257 case DK_ERROR: 2258 return parseDirectiveError(IDLoc, true); 2259 case DK_WARNING: 2260 return parseDirectiveWarning(IDLoc); 2261 case DK_RELOC: 2262 return parseDirectiveReloc(IDLoc); 2263 case DK_DCB: 2264 case DK_DCB_W: 2265 return parseDirectiveDCB(IDVal, 2); 2266 case DK_DCB_B: 2267 return parseDirectiveDCB(IDVal, 1); 2268 case DK_DCB_D: 2269 return parseDirectiveRealDCB(IDVal, APFloat::IEEEdouble()); 2270 case DK_DCB_L: 2271 return parseDirectiveDCB(IDVal, 4); 2272 case DK_DCB_S: 2273 return parseDirectiveRealDCB(IDVal, APFloat::IEEEsingle()); 2274 case DK_DC_X: 2275 case DK_DCB_X: 2276 return TokError(Twine(IDVal) + 2277 " not currently supported for this target"); 2278 case DK_DS: 2279 case DK_DS_W: 2280 return parseDirectiveDS(IDVal, 2); 2281 case DK_DS_B: 2282 return parseDirectiveDS(IDVal, 1); 2283 case DK_DS_D: 2284 return parseDirectiveDS(IDVal, 8); 2285 case DK_DS_L: 2286 case DK_DS_S: 2287 return parseDirectiveDS(IDVal, 4); 2288 case DK_DS_P: 2289 case DK_DS_X: 2290 return parseDirectiveDS(IDVal, 12); 2291 case DK_PRINT: 2292 return parseDirectivePrint(IDLoc); 2293 case DK_ADDRSIG: 2294 return parseDirectiveAddrsig(); 2295 case DK_ADDRSIG_SYM: 2296 return parseDirectiveAddrsigSym(); 2297 case DK_PSEUDO_PROBE: 2298 return parseDirectivePseudoProbe(); 2299 case DK_LTO_DISCARD: 2300 return parseDirectiveLTODiscard(); 2301 } 2302 2303 return Error(IDLoc, "unknown directive"); 2304 } 2305 2306 // __asm _emit or __asm __emit 2307 if (ParsingMSInlineAsm && (IDVal == "_emit" || IDVal == "__emit" || 2308 IDVal == "_EMIT" || IDVal == "__EMIT")) 2309 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size()); 2310 2311 // __asm align 2312 if (ParsingMSInlineAsm && (IDVal == "align" || IDVal == "ALIGN")) 2313 return parseDirectiveMSAlign(IDLoc, Info); 2314 2315 if (ParsingMSInlineAsm && (IDVal == "even" || IDVal == "EVEN")) 2316 Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4); 2317 if (checkForValidSection()) 2318 return true; 2319 2320 return parseAndMatchAndEmitTargetInstruction(Info, IDVal, ID, IDLoc); 2321 } 2322 2323 bool AsmParser::parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info, 2324 StringRef IDVal, 2325 AsmToken ID, 2326 SMLoc IDLoc) { 2327 // Canonicalize the opcode to lower case. 2328 std::string OpcodeStr = IDVal.lower(); 2329 ParseInstructionInfo IInfo(Info.AsmRewrites); 2330 bool ParseHadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID, 2331 Info.ParsedOperands); 2332 Info.ParseError = ParseHadError; 2333 2334 // Dump the parsed representation, if requested. 2335 if (getShowParsedOperands()) { 2336 SmallString<256> Str; 2337 raw_svector_ostream OS(Str); 2338 OS << "parsed instruction: ["; 2339 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) { 2340 if (i != 0) 2341 OS << ", "; 2342 Info.ParsedOperands[i]->print(OS); 2343 } 2344 OS << "]"; 2345 2346 printMessage(IDLoc, SourceMgr::DK_Note, OS.str()); 2347 } 2348 2349 // Fail even if ParseInstruction erroneously returns false. 2350 if (hasPendingError() || ParseHadError) 2351 return true; 2352 2353 // If we are generating dwarf for the current section then generate a .loc 2354 // directive for the instruction. 2355 if (!ParseHadError && enabledGenDwarfForAssembly() && 2356 getContext().getGenDwarfSectionSyms().count( 2357 getStreamer().getCurrentSectionOnly())) { 2358 unsigned Line; 2359 if (ActiveMacros.empty()) 2360 Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer); 2361 else 2362 Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc, 2363 ActiveMacros.front()->ExitBuffer); 2364 2365 // If we previously parsed a cpp hash file line comment then make sure the 2366 // current Dwarf File is for the CppHashFilename if not then emit the 2367 // Dwarf File table for it and adjust the line number for the .loc. 2368 if (!CppHashInfo.Filename.empty()) { 2369 unsigned FileNumber = getStreamer().emitDwarfFileDirective( 2370 0, StringRef(), CppHashInfo.Filename); 2371 getContext().setGenDwarfFileNumber(FileNumber); 2372 2373 unsigned CppHashLocLineNo = 2374 SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf); 2375 Line = CppHashInfo.LineNumber - 1 + (Line - CppHashLocLineNo); 2376 } 2377 2378 getStreamer().emitDwarfLocDirective( 2379 getContext().getGenDwarfFileNumber(), Line, 0, 2380 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0, 2381 StringRef()); 2382 } 2383 2384 // If parsing succeeded, match the instruction. 2385 if (!ParseHadError) { 2386 uint64_t ErrorInfo; 2387 if (getTargetParser().MatchAndEmitInstruction( 2388 IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo, 2389 getTargetParser().isParsingMSInlineAsm())) 2390 return true; 2391 } 2392 return false; 2393 } 2394 2395 // Parse and erase curly braces marking block start/end 2396 bool 2397 AsmParser::parseCurlyBlockScope(SmallVectorImpl<AsmRewrite> &AsmStrRewrites) { 2398 // Identify curly brace marking block start/end 2399 if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly)) 2400 return false; 2401 2402 SMLoc StartLoc = Lexer.getLoc(); 2403 Lex(); // Eat the brace 2404 if (Lexer.is(AsmToken::EndOfStatement)) 2405 Lex(); // Eat EndOfStatement following the brace 2406 2407 // Erase the block start/end brace from the output asm string 2408 AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() - 2409 StartLoc.getPointer()); 2410 return true; 2411 } 2412 2413 /// parseCppHashLineFilenameComment as this: 2414 /// ::= # number "filename" 2415 bool AsmParser::parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo) { 2416 Lex(); // Eat the hash token. 2417 // Lexer only ever emits HashDirective if it fully formed if it's 2418 // done the checking already so this is an internal error. 2419 assert(getTok().is(AsmToken::Integer) && 2420 "Lexing Cpp line comment: Expected Integer"); 2421 int64_t LineNumber = getTok().getIntVal(); 2422 Lex(); 2423 assert(getTok().is(AsmToken::String) && 2424 "Lexing Cpp line comment: Expected String"); 2425 StringRef Filename = getTok().getString(); 2426 Lex(); 2427 2428 if (!SaveLocInfo) 2429 return false; 2430 2431 // Get rid of the enclosing quotes. 2432 Filename = Filename.substr(1, Filename.size() - 2); 2433 2434 // Save the SMLoc, Filename and LineNumber for later use by diagnostics 2435 // and possibly DWARF file info. 2436 CppHashInfo.Loc = L; 2437 CppHashInfo.Filename = Filename; 2438 CppHashInfo.LineNumber = LineNumber; 2439 CppHashInfo.Buf = CurBuffer; 2440 if (FirstCppHashFilename.empty()) 2441 FirstCppHashFilename = Filename; 2442 return false; 2443 } 2444 2445 /// will use the last parsed cpp hash line filename comment 2446 /// for the Filename and LineNo if any in the diagnostic. 2447 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) { 2448 auto *Parser = static_cast<AsmParser *>(Context); 2449 raw_ostream &OS = errs(); 2450 2451 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr(); 2452 SMLoc DiagLoc = Diag.getLoc(); 2453 unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 2454 unsigned CppHashBuf = 2455 Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashInfo.Loc); 2456 2457 // Like SourceMgr::printMessage() we need to print the include stack if any 2458 // before printing the message. 2459 unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 2460 if (!Parser->SavedDiagHandler && DiagCurBuffer && 2461 DiagCurBuffer != DiagSrcMgr.getMainFileID()) { 2462 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer); 2463 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS); 2464 } 2465 2466 // If we have not parsed a cpp hash line filename comment or the source 2467 // manager changed or buffer changed (like in a nested include) then just 2468 // print the normal diagnostic using its Filename and LineNo. 2469 if (!Parser->CppHashInfo.LineNumber || DiagBuf != CppHashBuf) { 2470 if (Parser->SavedDiagHandler) 2471 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); 2472 else 2473 Parser->getContext().diagnose(Diag); 2474 return; 2475 } 2476 2477 // Use the CppHashFilename and calculate a line number based on the 2478 // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc 2479 // for the diagnostic. 2480 const std::string &Filename = std::string(Parser->CppHashInfo.Filename); 2481 2482 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf); 2483 int CppHashLocLineNo = 2484 Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf); 2485 int LineNo = 2486 Parser->CppHashInfo.LineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo); 2487 2488 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo, 2489 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(), 2490 Diag.getLineContents(), Diag.getRanges()); 2491 2492 if (Parser->SavedDiagHandler) 2493 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); 2494 else 2495 Parser->getContext().diagnose(NewDiag); 2496 } 2497 2498 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The 2499 // difference being that that function accepts '@' as part of identifiers and 2500 // we can't do that. AsmLexer.cpp should probably be changed to handle 2501 // '@' as a special case when needed. 2502 static bool isIdentifierChar(char c) { 2503 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' || 2504 c == '.'; 2505 } 2506 2507 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body, 2508 ArrayRef<MCAsmMacroParameter> Parameters, 2509 ArrayRef<MCAsmMacroArgument> A, 2510 bool EnableAtPseudoVariable, SMLoc L) { 2511 unsigned NParameters = Parameters.size(); 2512 bool HasVararg = NParameters ? Parameters.back().Vararg : false; 2513 if ((!IsDarwin || NParameters != 0) && NParameters != A.size()) 2514 return Error(L, "Wrong number of arguments"); 2515 2516 // A macro without parameters is handled differently on Darwin: 2517 // gas accepts no arguments and does no substitutions 2518 while (!Body.empty()) { 2519 // Scan for the next substitution. 2520 std::size_t End = Body.size(), Pos = 0; 2521 for (; Pos != End; ++Pos) { 2522 // Check for a substitution or escape. 2523 if (IsDarwin && !NParameters) { 2524 // This macro has no parameters, look for $0, $1, etc. 2525 if (Body[Pos] != '$' || Pos + 1 == End) 2526 continue; 2527 2528 char Next = Body[Pos + 1]; 2529 if (Next == '$' || Next == 'n' || 2530 isdigit(static_cast<unsigned char>(Next))) 2531 break; 2532 } else { 2533 // This macro has parameters, look for \foo, \bar, etc. 2534 if (Body[Pos] == '\\' && Pos + 1 != End) 2535 break; 2536 } 2537 } 2538 2539 // Add the prefix. 2540 OS << Body.slice(0, Pos); 2541 2542 // Check if we reached the end. 2543 if (Pos == End) 2544 break; 2545 2546 if (IsDarwin && !NParameters) { 2547 switch (Body[Pos + 1]) { 2548 // $$ => $ 2549 case '$': 2550 OS << '$'; 2551 break; 2552 2553 // $n => number of arguments 2554 case 'n': 2555 OS << A.size(); 2556 break; 2557 2558 // $[0-9] => argument 2559 default: { 2560 // Missing arguments are ignored. 2561 unsigned Index = Body[Pos + 1] - '0'; 2562 if (Index >= A.size()) 2563 break; 2564 2565 // Otherwise substitute with the token values, with spaces eliminated. 2566 for (const AsmToken &Token : A[Index]) 2567 OS << Token.getString(); 2568 break; 2569 } 2570 } 2571 Pos += 2; 2572 } else { 2573 unsigned I = Pos + 1; 2574 2575 // Check for the \@ pseudo-variable. 2576 if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End) 2577 ++I; 2578 else 2579 while (isIdentifierChar(Body[I]) && I + 1 != End) 2580 ++I; 2581 2582 const char *Begin = Body.data() + Pos + 1; 2583 StringRef Argument(Begin, I - (Pos + 1)); 2584 unsigned Index = 0; 2585 2586 if (Argument == "@") { 2587 OS << NumOfMacroInstantiations; 2588 Pos += 2; 2589 } else { 2590 for (; Index < NParameters; ++Index) 2591 if (Parameters[Index].Name == Argument) 2592 break; 2593 2594 if (Index == NParameters) { 2595 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 2596 Pos += 3; 2597 else { 2598 OS << '\\' << Argument; 2599 Pos = I; 2600 } 2601 } else { 2602 bool VarargParameter = HasVararg && Index == (NParameters - 1); 2603 for (const AsmToken &Token : A[Index]) 2604 // For altmacro mode, you can write '%expr'. 2605 // The prefix '%' evaluates the expression 'expr' 2606 // and uses the result as a string (e.g. replace %(1+2) with the 2607 // string "3"). 2608 // Here, we identify the integer token which is the result of the 2609 // absolute expression evaluation and replace it with its string 2610 // representation. 2611 if (AltMacroMode && Token.getString().front() == '%' && 2612 Token.is(AsmToken::Integer)) 2613 // Emit an integer value to the buffer. 2614 OS << Token.getIntVal(); 2615 // Only Token that was validated as a string and begins with '<' 2616 // is considered altMacroString!!! 2617 else if (AltMacroMode && Token.getString().front() == '<' && 2618 Token.is(AsmToken::String)) { 2619 OS << angleBracketString(Token.getStringContents()); 2620 } 2621 // We expect no quotes around the string's contents when 2622 // parsing for varargs. 2623 else if (Token.isNot(AsmToken::String) || VarargParameter) 2624 OS << Token.getString(); 2625 else 2626 OS << Token.getStringContents(); 2627 2628 Pos += 1 + Argument.size(); 2629 } 2630 } 2631 } 2632 // Update the scan point. 2633 Body = Body.substr(Pos); 2634 } 2635 2636 return false; 2637 } 2638 2639 static bool isOperator(AsmToken::TokenKind kind) { 2640 switch (kind) { 2641 default: 2642 return false; 2643 case AsmToken::Plus: 2644 case AsmToken::Minus: 2645 case AsmToken::Tilde: 2646 case AsmToken::Slash: 2647 case AsmToken::Star: 2648 case AsmToken::Dot: 2649 case AsmToken::Equal: 2650 case AsmToken::EqualEqual: 2651 case AsmToken::Pipe: 2652 case AsmToken::PipePipe: 2653 case AsmToken::Caret: 2654 case AsmToken::Amp: 2655 case AsmToken::AmpAmp: 2656 case AsmToken::Exclaim: 2657 case AsmToken::ExclaimEqual: 2658 case AsmToken::Less: 2659 case AsmToken::LessEqual: 2660 case AsmToken::LessLess: 2661 case AsmToken::LessGreater: 2662 case AsmToken::Greater: 2663 case AsmToken::GreaterEqual: 2664 case AsmToken::GreaterGreater: 2665 return true; 2666 } 2667 } 2668 2669 namespace { 2670 2671 class AsmLexerSkipSpaceRAII { 2672 public: 2673 AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) { 2674 Lexer.setSkipSpace(SkipSpace); 2675 } 2676 2677 ~AsmLexerSkipSpaceRAII() { 2678 Lexer.setSkipSpace(true); 2679 } 2680 2681 private: 2682 AsmLexer &Lexer; 2683 }; 2684 2685 } // end anonymous namespace 2686 2687 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) { 2688 2689 if (Vararg) { 2690 if (Lexer.isNot(AsmToken::EndOfStatement)) { 2691 StringRef Str = parseStringToEndOfStatement(); 2692 MA.emplace_back(AsmToken::String, Str); 2693 } 2694 return false; 2695 } 2696 2697 unsigned ParenLevel = 0; 2698 2699 // Darwin doesn't use spaces to delmit arguments. 2700 AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin); 2701 2702 bool SpaceEaten; 2703 2704 while (true) { 2705 SpaceEaten = false; 2706 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) 2707 return TokError("unexpected token in macro instantiation"); 2708 2709 if (ParenLevel == 0) { 2710 2711 if (Lexer.is(AsmToken::Comma)) 2712 break; 2713 2714 if (Lexer.is(AsmToken::Space)) { 2715 SpaceEaten = true; 2716 Lexer.Lex(); // Eat spaces 2717 } 2718 2719 // Spaces can delimit parameters, but could also be part an expression. 2720 // If the token after a space is an operator, add the token and the next 2721 // one into this argument 2722 if (!IsDarwin) { 2723 if (isOperator(Lexer.getKind())) { 2724 MA.push_back(getTok()); 2725 Lexer.Lex(); 2726 2727 // Whitespace after an operator can be ignored. 2728 if (Lexer.is(AsmToken::Space)) 2729 Lexer.Lex(); 2730 2731 continue; 2732 } 2733 } 2734 if (SpaceEaten) 2735 break; 2736 } 2737 2738 // handleMacroEntry relies on not advancing the lexer here 2739 // to be able to fill in the remaining default parameter values 2740 if (Lexer.is(AsmToken::EndOfStatement)) 2741 break; 2742 2743 // Adjust the current parentheses level. 2744 if (Lexer.is(AsmToken::LParen)) 2745 ++ParenLevel; 2746 else if (Lexer.is(AsmToken::RParen) && ParenLevel) 2747 --ParenLevel; 2748 2749 // Append the token to the current argument list. 2750 MA.push_back(getTok()); 2751 Lexer.Lex(); 2752 } 2753 2754 if (ParenLevel != 0) 2755 return TokError("unbalanced parentheses in macro argument"); 2756 return false; 2757 } 2758 2759 // Parse the macro instantiation arguments. 2760 bool AsmParser::parseMacroArguments(const MCAsmMacro *M, 2761 MCAsmMacroArguments &A) { 2762 const unsigned NParameters = M ? M->Parameters.size() : 0; 2763 bool NamedParametersFound = false; 2764 SmallVector<SMLoc, 4> FALocs; 2765 2766 A.resize(NParameters); 2767 FALocs.resize(NParameters); 2768 2769 // Parse two kinds of macro invocations: 2770 // - macros defined without any parameters accept an arbitrary number of them 2771 // - macros defined with parameters accept at most that many of them 2772 bool HasVararg = NParameters ? M->Parameters.back().Vararg : false; 2773 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters; 2774 ++Parameter) { 2775 SMLoc IDLoc = Lexer.getLoc(); 2776 MCAsmMacroParameter FA; 2777 2778 if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) { 2779 if (parseIdentifier(FA.Name)) 2780 return Error(IDLoc, "invalid argument identifier for formal argument"); 2781 2782 if (Lexer.isNot(AsmToken::Equal)) 2783 return TokError("expected '=' after formal parameter identifier"); 2784 2785 Lex(); 2786 2787 NamedParametersFound = true; 2788 } 2789 bool Vararg = HasVararg && Parameter == (NParameters - 1); 2790 2791 if (NamedParametersFound && FA.Name.empty()) 2792 return Error(IDLoc, "cannot mix positional and keyword arguments"); 2793 2794 SMLoc StrLoc = Lexer.getLoc(); 2795 SMLoc EndLoc; 2796 if (AltMacroMode && Lexer.is(AsmToken::Percent)) { 2797 const MCExpr *AbsoluteExp; 2798 int64_t Value; 2799 /// Eat '%' 2800 Lex(); 2801 if (parseExpression(AbsoluteExp, EndLoc)) 2802 return false; 2803 if (!AbsoluteExp->evaluateAsAbsolute(Value, 2804 getStreamer().getAssemblerPtr())) 2805 return Error(StrLoc, "expected absolute expression"); 2806 const char *StrChar = StrLoc.getPointer(); 2807 const char *EndChar = EndLoc.getPointer(); 2808 AsmToken newToken(AsmToken::Integer, 2809 StringRef(StrChar, EndChar - StrChar), Value); 2810 FA.Value.push_back(newToken); 2811 } else if (AltMacroMode && Lexer.is(AsmToken::Less) && 2812 isAngleBracketString(StrLoc, EndLoc)) { 2813 const char *StrChar = StrLoc.getPointer(); 2814 const char *EndChar = EndLoc.getPointer(); 2815 jumpToLoc(EndLoc, CurBuffer); 2816 /// Eat from '<' to '>' 2817 Lex(); 2818 AsmToken newToken(AsmToken::String, 2819 StringRef(StrChar, EndChar - StrChar)); 2820 FA.Value.push_back(newToken); 2821 } else if(parseMacroArgument(FA.Value, Vararg)) 2822 return true; 2823 2824 unsigned PI = Parameter; 2825 if (!FA.Name.empty()) { 2826 unsigned FAI = 0; 2827 for (FAI = 0; FAI < NParameters; ++FAI) 2828 if (M->Parameters[FAI].Name == FA.Name) 2829 break; 2830 2831 if (FAI >= NParameters) { 2832 assert(M && "expected macro to be defined"); 2833 return Error(IDLoc, "parameter named '" + FA.Name + 2834 "' does not exist for macro '" + M->Name + "'"); 2835 } 2836 PI = FAI; 2837 } 2838 2839 if (!FA.Value.empty()) { 2840 if (A.size() <= PI) 2841 A.resize(PI + 1); 2842 A[PI] = FA.Value; 2843 2844 if (FALocs.size() <= PI) 2845 FALocs.resize(PI + 1); 2846 2847 FALocs[PI] = Lexer.getLoc(); 2848 } 2849 2850 // At the end of the statement, fill in remaining arguments that have 2851 // default values. If there aren't any, then the next argument is 2852 // required but missing 2853 if (Lexer.is(AsmToken::EndOfStatement)) { 2854 bool Failure = false; 2855 for (unsigned FAI = 0; FAI < NParameters; ++FAI) { 2856 if (A[FAI].empty()) { 2857 if (M->Parameters[FAI].Required) { 2858 Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(), 2859 "missing value for required parameter " 2860 "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'"); 2861 Failure = true; 2862 } 2863 2864 if (!M->Parameters[FAI].Value.empty()) 2865 A[FAI] = M->Parameters[FAI].Value; 2866 } 2867 } 2868 return Failure; 2869 } 2870 2871 if (Lexer.is(AsmToken::Comma)) 2872 Lex(); 2873 } 2874 2875 return TokError("too many positional arguments"); 2876 } 2877 2878 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) { 2879 // Arbitrarily limit macro nesting depth (default matches 'as'). We can 2880 // eliminate this, although we should protect against infinite loops. 2881 unsigned MaxNestingDepth = AsmMacroMaxNestingDepth; 2882 if (ActiveMacros.size() == MaxNestingDepth) { 2883 std::ostringstream MaxNestingDepthError; 2884 MaxNestingDepthError << "macros cannot be nested more than " 2885 << MaxNestingDepth << " levels deep." 2886 << " Use -asm-macro-max-nesting-depth to increase " 2887 "this limit."; 2888 return TokError(MaxNestingDepthError.str()); 2889 } 2890 2891 MCAsmMacroArguments A; 2892 if (parseMacroArguments(M, A)) 2893 return true; 2894 2895 // Macro instantiation is lexical, unfortunately. We construct a new buffer 2896 // to hold the macro body with substitutions. 2897 SmallString<256> Buf; 2898 StringRef Body = M->Body; 2899 raw_svector_ostream OS(Buf); 2900 2901 if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc())) 2902 return true; 2903 2904 // We include the .endmacro in the buffer as our cue to exit the macro 2905 // instantiation. 2906 OS << ".endmacro\n"; 2907 2908 std::unique_ptr<MemoryBuffer> Instantiation = 2909 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 2910 2911 // Create the macro instantiation object and add to the current macro 2912 // instantiation stack. 2913 MacroInstantiation *MI = new MacroInstantiation{ 2914 NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()}; 2915 ActiveMacros.push_back(MI); 2916 2917 ++NumOfMacroInstantiations; 2918 2919 // Jump to the macro instantiation and prime the lexer. 2920 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 2921 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 2922 Lex(); 2923 2924 return false; 2925 } 2926 2927 void AsmParser::handleMacroExit() { 2928 // Jump to the EndOfStatement we should return to, and consume it. 2929 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer); 2930 Lex(); 2931 2932 // Pop the instantiation entry. 2933 delete ActiveMacros.back(); 2934 ActiveMacros.pop_back(); 2935 } 2936 2937 bool AsmParser::parseAssignment(StringRef Name, AssignmentKind Kind) { 2938 MCSymbol *Sym; 2939 const MCExpr *Value; 2940 SMLoc ExprLoc = getTok().getLoc(); 2941 bool AllowRedef = 2942 Kind == AssignmentKind::Set || Kind == AssignmentKind::Equal; 2943 if (MCParserUtils::parseAssignmentExpression(Name, AllowRedef, *this, Sym, 2944 Value)) 2945 return true; 2946 2947 if (!Sym) { 2948 // In the case where we parse an expression starting with a '.', we will 2949 // not generate an error, nor will we create a symbol. In this case we 2950 // should just return out. 2951 return false; 2952 } 2953 2954 if (discardLTOSymbol(Name)) 2955 return false; 2956 2957 // Do the assignment. 2958 switch (Kind) { 2959 case AssignmentKind::Equal: 2960 Out.emitAssignment(Sym, Value); 2961 break; 2962 case AssignmentKind::Set: 2963 case AssignmentKind::Equiv: 2964 Out.emitAssignment(Sym, Value); 2965 Out.emitSymbolAttribute(Sym, MCSA_NoDeadStrip); 2966 break; 2967 case AssignmentKind::LTOSetConditional: 2968 if (Value->getKind() != MCExpr::SymbolRef) 2969 return Error(ExprLoc, "expected identifier"); 2970 2971 Out.emitConditionalAssignment(Sym, Value); 2972 break; 2973 } 2974 2975 return false; 2976 } 2977 2978 /// parseIdentifier: 2979 /// ::= identifier 2980 /// ::= string 2981 bool AsmParser::parseIdentifier(StringRef &Res) { 2982 // The assembler has relaxed rules for accepting identifiers, in particular we 2983 // allow things like '.globl $foo' and '.def @feat.00', which would normally be 2984 // separate tokens. At this level, we have already lexed so we cannot (currently) 2985 // handle this as a context dependent token, instead we detect adjacent tokens 2986 // and return the combined identifier. 2987 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) { 2988 SMLoc PrefixLoc = getLexer().getLoc(); 2989 2990 // Consume the prefix character, and check for a following identifier. 2991 2992 AsmToken Buf[1]; 2993 Lexer.peekTokens(Buf, false); 2994 2995 if (Buf[0].isNot(AsmToken::Identifier) && Buf[0].isNot(AsmToken::Integer)) 2996 return true; 2997 2998 // We have a '$' or '@' followed by an identifier or integer token, make 2999 // sure they are adjacent. 3000 if (PrefixLoc.getPointer() + 1 != Buf[0].getLoc().getPointer()) 3001 return true; 3002 3003 // eat $ or @ 3004 Lexer.Lex(); // Lexer's Lex guarantees consecutive token. 3005 // Construct the joined identifier and consume the token. 3006 Res = StringRef(PrefixLoc.getPointer(), getTok().getString().size() + 1); 3007 Lex(); // Parser Lex to maintain invariants. 3008 return false; 3009 } 3010 3011 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String)) 3012 return true; 3013 3014 Res = getTok().getIdentifier(); 3015 3016 Lex(); // Consume the identifier token. 3017 3018 return false; 3019 } 3020 3021 /// parseDirectiveSet: 3022 /// ::= .equ identifier ',' expression 3023 /// ::= .equiv identifier ',' expression 3024 /// ::= .set identifier ',' expression 3025 /// ::= .lto_set_conditional identifier ',' expression 3026 bool AsmParser::parseDirectiveSet(StringRef IDVal, AssignmentKind Kind) { 3027 StringRef Name; 3028 if (check(parseIdentifier(Name), "expected identifier") || parseComma() || 3029 parseAssignment(Name, Kind)) 3030 return true; 3031 return false; 3032 } 3033 3034 bool AsmParser::parseEscapedString(std::string &Data) { 3035 if (check(getTok().isNot(AsmToken::String), "expected string")) 3036 return true; 3037 3038 Data = ""; 3039 StringRef Str = getTok().getStringContents(); 3040 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 3041 if (Str[i] != '\\') { 3042 Data += Str[i]; 3043 continue; 3044 } 3045 3046 // Recognize escaped characters. Note that this escape semantics currently 3047 // loosely follows Darwin 'as'. 3048 ++i; 3049 if (i == e) 3050 return TokError("unexpected backslash at end of string"); 3051 3052 // Recognize hex sequences similarly to GNU 'as'. 3053 if (Str[i] == 'x' || Str[i] == 'X') { 3054 size_t length = Str.size(); 3055 if (i + 1 >= length || !isHexDigit(Str[i + 1])) 3056 return TokError("invalid hexadecimal escape sequence"); 3057 3058 // Consume hex characters. GNU 'as' reads all hexadecimal characters and 3059 // then truncates to the lower 16 bits. Seems reasonable. 3060 unsigned Value = 0; 3061 while (i + 1 < length && isHexDigit(Str[i + 1])) 3062 Value = Value * 16 + hexDigitValue(Str[++i]); 3063 3064 Data += (unsigned char)(Value & 0xFF); 3065 continue; 3066 } 3067 3068 // Recognize octal sequences. 3069 if ((unsigned)(Str[i] - '0') <= 7) { 3070 // Consume up to three octal characters. 3071 unsigned Value = Str[i] - '0'; 3072 3073 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 3074 ++i; 3075 Value = Value * 8 + (Str[i] - '0'); 3076 3077 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 3078 ++i; 3079 Value = Value * 8 + (Str[i] - '0'); 3080 } 3081 } 3082 3083 if (Value > 255) 3084 return TokError("invalid octal escape sequence (out of range)"); 3085 3086 Data += (unsigned char)Value; 3087 continue; 3088 } 3089 3090 // Otherwise recognize individual escapes. 3091 switch (Str[i]) { 3092 default: 3093 // Just reject invalid escape sequences for now. 3094 return TokError("invalid escape sequence (unrecognized character)"); 3095 3096 case 'b': Data += '\b'; break; 3097 case 'f': Data += '\f'; break; 3098 case 'n': Data += '\n'; break; 3099 case 'r': Data += '\r'; break; 3100 case 't': Data += '\t'; break; 3101 case '"': Data += '"'; break; 3102 case '\\': Data += '\\'; break; 3103 } 3104 } 3105 3106 Lex(); 3107 return false; 3108 } 3109 3110 bool AsmParser::parseAngleBracketString(std::string &Data) { 3111 SMLoc EndLoc, StartLoc = getTok().getLoc(); 3112 if (isAngleBracketString(StartLoc, EndLoc)) { 3113 const char *StartChar = StartLoc.getPointer() + 1; 3114 const char *EndChar = EndLoc.getPointer() - 1; 3115 jumpToLoc(EndLoc, CurBuffer); 3116 /// Eat from '<' to '>' 3117 Lex(); 3118 3119 Data = angleBracketString(StringRef(StartChar, EndChar - StartChar)); 3120 return false; 3121 } 3122 return true; 3123 } 3124 3125 /// parseDirectiveAscii: 3126 // ::= .ascii [ "string"+ ( , "string"+ )* ] 3127 /// ::= ( .asciz | .string ) [ "string" ( , "string" )* ] 3128 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) { 3129 auto parseOp = [&]() -> bool { 3130 std::string Data; 3131 if (checkForValidSection()) 3132 return true; 3133 // Only support spaces as separators for .ascii directive for now. See the 3134 // discusssion at https://reviews.llvm.org/D91460 for more details. 3135 do { 3136 if (parseEscapedString(Data)) 3137 return true; 3138 getStreamer().emitBytes(Data); 3139 } while (!ZeroTerminated && getTok().is(AsmToken::String)); 3140 if (ZeroTerminated) 3141 getStreamer().emitBytes(StringRef("\0", 1)); 3142 return false; 3143 }; 3144 3145 return parseMany(parseOp); 3146 } 3147 3148 /// parseDirectiveReloc 3149 /// ::= .reloc expression , identifier [ , expression ] 3150 bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) { 3151 const MCExpr *Offset; 3152 const MCExpr *Expr = nullptr; 3153 SMLoc OffsetLoc = Lexer.getTok().getLoc(); 3154 3155 if (parseExpression(Offset)) 3156 return true; 3157 if (parseComma() || 3158 check(getTok().isNot(AsmToken::Identifier), "expected relocation name")) 3159 return true; 3160 3161 SMLoc NameLoc = Lexer.getTok().getLoc(); 3162 StringRef Name = Lexer.getTok().getIdentifier(); 3163 Lex(); 3164 3165 if (Lexer.is(AsmToken::Comma)) { 3166 Lex(); 3167 SMLoc ExprLoc = Lexer.getLoc(); 3168 if (parseExpression(Expr)) 3169 return true; 3170 3171 MCValue Value; 3172 if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr)) 3173 return Error(ExprLoc, "expression must be relocatable"); 3174 } 3175 3176 if (parseEOL()) 3177 return true; 3178 3179 const MCTargetAsmParser &MCT = getTargetParser(); 3180 const MCSubtargetInfo &STI = MCT.getSTI(); 3181 if (Optional<std::pair<bool, std::string>> Err = 3182 getStreamer().emitRelocDirective(*Offset, Name, Expr, DirectiveLoc, 3183 STI)) 3184 return Error(Err->first ? NameLoc : OffsetLoc, Err->second); 3185 3186 return false; 3187 } 3188 3189 /// parseDirectiveValue 3190 /// ::= (.byte | .short | ... ) [ expression (, expression)* ] 3191 bool AsmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) { 3192 auto parseOp = [&]() -> bool { 3193 const MCExpr *Value; 3194 SMLoc ExprLoc = getLexer().getLoc(); 3195 if (checkForValidSection() || parseExpression(Value)) 3196 return true; 3197 // Special case constant expressions to match code generator. 3198 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3199 assert(Size <= 8 && "Invalid size"); 3200 uint64_t IntValue = MCE->getValue(); 3201 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 3202 return Error(ExprLoc, "out of range literal value"); 3203 getStreamer().emitIntValue(IntValue, Size); 3204 } else 3205 getStreamer().emitValue(Value, Size, ExprLoc); 3206 return false; 3207 }; 3208 3209 return parseMany(parseOp); 3210 } 3211 3212 static bool parseHexOcta(AsmParser &Asm, uint64_t &hi, uint64_t &lo) { 3213 if (Asm.getTok().isNot(AsmToken::Integer) && 3214 Asm.getTok().isNot(AsmToken::BigNum)) 3215 return Asm.TokError("unknown token in expression"); 3216 SMLoc ExprLoc = Asm.getTok().getLoc(); 3217 APInt IntValue = Asm.getTok().getAPIntVal(); 3218 Asm.Lex(); 3219 if (!IntValue.isIntN(128)) 3220 return Asm.Error(ExprLoc, "out of range literal value"); 3221 if (!IntValue.isIntN(64)) { 3222 hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue(); 3223 lo = IntValue.getLoBits(64).getZExtValue(); 3224 } else { 3225 hi = 0; 3226 lo = IntValue.getZExtValue(); 3227 } 3228 return false; 3229 } 3230 3231 /// ParseDirectiveOctaValue 3232 /// ::= .octa [ hexconstant (, hexconstant)* ] 3233 3234 bool AsmParser::parseDirectiveOctaValue(StringRef IDVal) { 3235 auto parseOp = [&]() -> bool { 3236 if (checkForValidSection()) 3237 return true; 3238 uint64_t hi, lo; 3239 if (parseHexOcta(*this, hi, lo)) 3240 return true; 3241 if (MAI.isLittleEndian()) { 3242 getStreamer().emitInt64(lo); 3243 getStreamer().emitInt64(hi); 3244 } else { 3245 getStreamer().emitInt64(hi); 3246 getStreamer().emitInt64(lo); 3247 } 3248 return false; 3249 }; 3250 3251 return parseMany(parseOp); 3252 } 3253 3254 bool AsmParser::parseRealValue(const fltSemantics &Semantics, APInt &Res) { 3255 // We don't truly support arithmetic on floating point expressions, so we 3256 // have to manually parse unary prefixes. 3257 bool IsNeg = false; 3258 if (getLexer().is(AsmToken::Minus)) { 3259 Lexer.Lex(); 3260 IsNeg = true; 3261 } else if (getLexer().is(AsmToken::Plus)) 3262 Lexer.Lex(); 3263 3264 if (Lexer.is(AsmToken::Error)) 3265 return TokError(Lexer.getErr()); 3266 if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) && 3267 Lexer.isNot(AsmToken::Identifier)) 3268 return TokError("unexpected token in directive"); 3269 3270 // Convert to an APFloat. 3271 APFloat Value(Semantics); 3272 StringRef IDVal = getTok().getString(); 3273 if (getLexer().is(AsmToken::Identifier)) { 3274 if (!IDVal.compare_insensitive("infinity") || 3275 !IDVal.compare_insensitive("inf")) 3276 Value = APFloat::getInf(Semantics); 3277 else if (!IDVal.compare_insensitive("nan")) 3278 Value = APFloat::getNaN(Semantics, false, ~0); 3279 else 3280 return TokError("invalid floating point literal"); 3281 } else if (errorToBool( 3282 Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) 3283 .takeError())) 3284 return TokError("invalid floating point literal"); 3285 if (IsNeg) 3286 Value.changeSign(); 3287 3288 // Consume the numeric token. 3289 Lex(); 3290 3291 Res = Value.bitcastToAPInt(); 3292 3293 return false; 3294 } 3295 3296 /// parseDirectiveRealValue 3297 /// ::= (.single | .double) [ expression (, expression)* ] 3298 bool AsmParser::parseDirectiveRealValue(StringRef IDVal, 3299 const fltSemantics &Semantics) { 3300 auto parseOp = [&]() -> bool { 3301 APInt AsInt; 3302 if (checkForValidSection() || parseRealValue(Semantics, AsInt)) 3303 return true; 3304 getStreamer().emitIntValue(AsInt.getLimitedValue(), 3305 AsInt.getBitWidth() / 8); 3306 return false; 3307 }; 3308 3309 return parseMany(parseOp); 3310 } 3311 3312 /// parseDirectiveZero 3313 /// ::= .zero expression 3314 bool AsmParser::parseDirectiveZero() { 3315 SMLoc NumBytesLoc = Lexer.getLoc(); 3316 const MCExpr *NumBytes; 3317 if (checkForValidSection() || parseExpression(NumBytes)) 3318 return true; 3319 3320 int64_t Val = 0; 3321 if (getLexer().is(AsmToken::Comma)) { 3322 Lex(); 3323 if (parseAbsoluteExpression(Val)) 3324 return true; 3325 } 3326 3327 if (parseEOL()) 3328 return true; 3329 getStreamer().emitFill(*NumBytes, Val, NumBytesLoc); 3330 3331 return false; 3332 } 3333 3334 /// parseDirectiveFill 3335 /// ::= .fill expression [ , expression [ , expression ] ] 3336 bool AsmParser::parseDirectiveFill() { 3337 SMLoc NumValuesLoc = Lexer.getLoc(); 3338 const MCExpr *NumValues; 3339 if (checkForValidSection() || parseExpression(NumValues)) 3340 return true; 3341 3342 int64_t FillSize = 1; 3343 int64_t FillExpr = 0; 3344 3345 SMLoc SizeLoc, ExprLoc; 3346 3347 if (parseOptionalToken(AsmToken::Comma)) { 3348 SizeLoc = getTok().getLoc(); 3349 if (parseAbsoluteExpression(FillSize)) 3350 return true; 3351 if (parseOptionalToken(AsmToken::Comma)) { 3352 ExprLoc = getTok().getLoc(); 3353 if (parseAbsoluteExpression(FillExpr)) 3354 return true; 3355 } 3356 } 3357 if (parseEOL()) 3358 return true; 3359 3360 if (FillSize < 0) { 3361 Warning(SizeLoc, "'.fill' directive with negative size has no effect"); 3362 return false; 3363 } 3364 if (FillSize > 8) { 3365 Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8"); 3366 FillSize = 8; 3367 } 3368 3369 if (!isUInt<32>(FillExpr) && FillSize > 4) 3370 Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits"); 3371 3372 getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc); 3373 3374 return false; 3375 } 3376 3377 /// parseDirectiveOrg 3378 /// ::= .org expression [ , expression ] 3379 bool AsmParser::parseDirectiveOrg() { 3380 const MCExpr *Offset; 3381 SMLoc OffsetLoc = Lexer.getLoc(); 3382 if (checkForValidSection() || parseExpression(Offset)) 3383 return true; 3384 3385 // Parse optional fill expression. 3386 int64_t FillExpr = 0; 3387 if (parseOptionalToken(AsmToken::Comma)) 3388 if (parseAbsoluteExpression(FillExpr)) 3389 return true; 3390 if (parseEOL()) 3391 return true; 3392 3393 getStreamer().emitValueToOffset(Offset, FillExpr, OffsetLoc); 3394 return false; 3395 } 3396 3397 /// parseDirectiveAlign 3398 /// ::= {.align, ...} expression [ , expression [ , expression ]] 3399 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) { 3400 SMLoc AlignmentLoc = getLexer().getLoc(); 3401 int64_t Alignment; 3402 SMLoc MaxBytesLoc; 3403 bool HasFillExpr = false; 3404 int64_t FillExpr = 0; 3405 int64_t MaxBytesToFill = 0; 3406 3407 auto parseAlign = [&]() -> bool { 3408 if (parseAbsoluteExpression(Alignment)) 3409 return true; 3410 if (parseOptionalToken(AsmToken::Comma)) { 3411 // The fill expression can be omitted while specifying a maximum number of 3412 // alignment bytes, e.g: 3413 // .align 3,,4 3414 if (getTok().isNot(AsmToken::Comma)) { 3415 HasFillExpr = true; 3416 if (parseAbsoluteExpression(FillExpr)) 3417 return true; 3418 } 3419 if (parseOptionalToken(AsmToken::Comma)) 3420 if (parseTokenLoc(MaxBytesLoc) || 3421 parseAbsoluteExpression(MaxBytesToFill)) 3422 return true; 3423 } 3424 return parseEOL(); 3425 }; 3426 3427 if (checkForValidSection()) 3428 return true; 3429 // Ignore empty '.p2align' directives for GNU-as compatibility 3430 if (IsPow2 && (ValueSize == 1) && getTok().is(AsmToken::EndOfStatement)) { 3431 Warning(AlignmentLoc, "p2align directive with no operand(s) is ignored"); 3432 return parseEOL(); 3433 } 3434 if (parseAlign()) 3435 return true; 3436 3437 // Always emit an alignment here even if we thrown an error. 3438 bool ReturnVal = false; 3439 3440 // Compute alignment in bytes. 3441 if (IsPow2) { 3442 // FIXME: Diagnose overflow. 3443 if (Alignment >= 32) { 3444 ReturnVal |= Error(AlignmentLoc, "invalid alignment value"); 3445 Alignment = 31; 3446 } 3447 3448 Alignment = 1ULL << Alignment; 3449 } else { 3450 // Reject alignments that aren't either a power of two or zero, 3451 // for gas compatibility. Alignment of zero is silently rounded 3452 // up to one. 3453 if (Alignment == 0) 3454 Alignment = 1; 3455 else if (!isPowerOf2_64(Alignment)) { 3456 ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2"); 3457 Alignment = PowerOf2Floor(Alignment); 3458 } 3459 if (!isUInt<32>(Alignment)) { 3460 ReturnVal |= Error(AlignmentLoc, "alignment must be smaller than 2**32"); 3461 Alignment = 1u << 31; 3462 } 3463 } 3464 3465 // Diagnose non-sensical max bytes to align. 3466 if (MaxBytesLoc.isValid()) { 3467 if (MaxBytesToFill < 1) { 3468 ReturnVal |= Error(MaxBytesLoc, 3469 "alignment directive can never be satisfied in this " 3470 "many bytes, ignoring maximum bytes expression"); 3471 MaxBytesToFill = 0; 3472 } 3473 3474 if (MaxBytesToFill >= Alignment) { 3475 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and " 3476 "has no effect"); 3477 MaxBytesToFill = 0; 3478 } 3479 } 3480 3481 // Check whether we should use optimal code alignment for this .align 3482 // directive. 3483 const MCSection *Section = getStreamer().getCurrentSectionOnly(); 3484 assert(Section && "must have section to emit alignment"); 3485 bool useCodeAlign = Section->useCodeAlign(); 3486 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) && 3487 ValueSize == 1 && useCodeAlign) { 3488 getStreamer().emitCodeAlignment(Alignment, &getTargetParser().getSTI(), 3489 MaxBytesToFill); 3490 } else { 3491 // FIXME: Target specific behavior about how the "extra" bytes are filled. 3492 getStreamer().emitValueToAlignment(Alignment, FillExpr, ValueSize, 3493 MaxBytesToFill); 3494 } 3495 3496 return ReturnVal; 3497 } 3498 3499 /// parseDirectiveFile 3500 /// ::= .file filename 3501 /// ::= .file number [directory] filename [md5 checksum] [source source-text] 3502 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) { 3503 // FIXME: I'm not sure what this is. 3504 int64_t FileNumber = -1; 3505 if (getLexer().is(AsmToken::Integer)) { 3506 FileNumber = getTok().getIntVal(); 3507 Lex(); 3508 3509 if (FileNumber < 0) 3510 return TokError("negative file number"); 3511 } 3512 3513 std::string Path; 3514 3515 // Usually the directory and filename together, otherwise just the directory. 3516 // Allow the strings to have escaped octal character sequence. 3517 if (parseEscapedString(Path)) 3518 return true; 3519 3520 StringRef Directory; 3521 StringRef Filename; 3522 std::string FilenameData; 3523 if (getLexer().is(AsmToken::String)) { 3524 if (check(FileNumber == -1, 3525 "explicit path specified, but no file number") || 3526 parseEscapedString(FilenameData)) 3527 return true; 3528 Filename = FilenameData; 3529 Directory = Path; 3530 } else { 3531 Filename = Path; 3532 } 3533 3534 uint64_t MD5Hi, MD5Lo; 3535 bool HasMD5 = false; 3536 3537 Optional<StringRef> Source; 3538 bool HasSource = false; 3539 std::string SourceString; 3540 3541 while (!parseOptionalToken(AsmToken::EndOfStatement)) { 3542 StringRef Keyword; 3543 if (check(getTok().isNot(AsmToken::Identifier), 3544 "unexpected token in '.file' directive") || 3545 parseIdentifier(Keyword)) 3546 return true; 3547 if (Keyword == "md5") { 3548 HasMD5 = true; 3549 if (check(FileNumber == -1, 3550 "MD5 checksum specified, but no file number") || 3551 parseHexOcta(*this, MD5Hi, MD5Lo)) 3552 return true; 3553 } else if (Keyword == "source") { 3554 HasSource = true; 3555 if (check(FileNumber == -1, 3556 "source specified, but no file number") || 3557 check(getTok().isNot(AsmToken::String), 3558 "unexpected token in '.file' directive") || 3559 parseEscapedString(SourceString)) 3560 return true; 3561 } else { 3562 return TokError("unexpected token in '.file' directive"); 3563 } 3564 } 3565 3566 if (FileNumber == -1) { 3567 // Ignore the directive if there is no number and the target doesn't support 3568 // numberless .file directives. This allows some portability of assembler 3569 // between different object file formats. 3570 if (getContext().getAsmInfo()->hasSingleParameterDotFile()) 3571 getStreamer().emitFileDirective(Filename); 3572 } else { 3573 // In case there is a -g option as well as debug info from directive .file, 3574 // we turn off the -g option, directly use the existing debug info instead. 3575 // Throw away any implicit file table for the assembler source. 3576 if (Ctx.getGenDwarfForAssembly()) { 3577 Ctx.getMCDwarfLineTable(0).resetFileTable(); 3578 Ctx.setGenDwarfForAssembly(false); 3579 } 3580 3581 Optional<MD5::MD5Result> CKMem; 3582 if (HasMD5) { 3583 MD5::MD5Result Sum; 3584 for (unsigned i = 0; i != 8; ++i) { 3585 Sum[i] = uint8_t(MD5Hi >> ((7 - i) * 8)); 3586 Sum[i + 8] = uint8_t(MD5Lo >> ((7 - i) * 8)); 3587 } 3588 CKMem = Sum; 3589 } 3590 if (HasSource) { 3591 char *SourceBuf = static_cast<char *>(Ctx.allocate(SourceString.size())); 3592 memcpy(SourceBuf, SourceString.data(), SourceString.size()); 3593 Source = StringRef(SourceBuf, SourceString.size()); 3594 } 3595 if (FileNumber == 0) { 3596 // Upgrade to Version 5 for assembly actions like clang -c a.s. 3597 if (Ctx.getDwarfVersion() < 5) 3598 Ctx.setDwarfVersion(5); 3599 getStreamer().emitDwarfFile0Directive(Directory, Filename, CKMem, Source); 3600 } else { 3601 Expected<unsigned> FileNumOrErr = getStreamer().tryEmitDwarfFileDirective( 3602 FileNumber, Directory, Filename, CKMem, Source); 3603 if (!FileNumOrErr) 3604 return Error(DirectiveLoc, toString(FileNumOrErr.takeError())); 3605 } 3606 // Alert the user if there are some .file directives with MD5 and some not. 3607 // But only do that once. 3608 if (!ReportedInconsistentMD5 && !Ctx.isDwarfMD5UsageConsistent(0)) { 3609 ReportedInconsistentMD5 = true; 3610 return Warning(DirectiveLoc, "inconsistent use of MD5 checksums"); 3611 } 3612 } 3613 3614 return false; 3615 } 3616 3617 /// parseDirectiveLine 3618 /// ::= .line [number] 3619 bool AsmParser::parseDirectiveLine() { 3620 int64_t LineNumber; 3621 if (getLexer().is(AsmToken::Integer)) { 3622 if (parseIntToken(LineNumber, "unexpected token in '.line' directive")) 3623 return true; 3624 (void)LineNumber; 3625 // FIXME: Do something with the .line. 3626 } 3627 return parseEOL(); 3628 } 3629 3630 /// parseDirectiveLoc 3631 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end] 3632 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE] 3633 /// The first number is a file number, must have been previously assigned with 3634 /// a .file directive, the second number is the line number and optionally the 3635 /// third number is a column position (zero if not specified). The remaining 3636 /// optional items are .loc sub-directives. 3637 bool AsmParser::parseDirectiveLoc() { 3638 int64_t FileNumber = 0, LineNumber = 0; 3639 SMLoc Loc = getTok().getLoc(); 3640 if (parseIntToken(FileNumber, "unexpected token in '.loc' directive") || 3641 check(FileNumber < 1 && Ctx.getDwarfVersion() < 5, Loc, 3642 "file number less than one in '.loc' directive") || 3643 check(!getContext().isValidDwarfFileNumber(FileNumber), Loc, 3644 "unassigned file number in '.loc' directive")) 3645 return true; 3646 3647 // optional 3648 if (getLexer().is(AsmToken::Integer)) { 3649 LineNumber = getTok().getIntVal(); 3650 if (LineNumber < 0) 3651 return TokError("line number less than zero in '.loc' directive"); 3652 Lex(); 3653 } 3654 3655 int64_t ColumnPos = 0; 3656 if (getLexer().is(AsmToken::Integer)) { 3657 ColumnPos = getTok().getIntVal(); 3658 if (ColumnPos < 0) 3659 return TokError("column position less than zero in '.loc' directive"); 3660 Lex(); 3661 } 3662 3663 auto PrevFlags = getContext().getCurrentDwarfLoc().getFlags(); 3664 unsigned Flags = PrevFlags & DWARF2_FLAG_IS_STMT; 3665 unsigned Isa = 0; 3666 int64_t Discriminator = 0; 3667 3668 auto parseLocOp = [&]() -> bool { 3669 StringRef Name; 3670 SMLoc Loc = getTok().getLoc(); 3671 if (parseIdentifier(Name)) 3672 return TokError("unexpected token in '.loc' directive"); 3673 3674 if (Name == "basic_block") 3675 Flags |= DWARF2_FLAG_BASIC_BLOCK; 3676 else if (Name == "prologue_end") 3677 Flags |= DWARF2_FLAG_PROLOGUE_END; 3678 else if (Name == "epilogue_begin") 3679 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN; 3680 else if (Name == "is_stmt") { 3681 Loc = getTok().getLoc(); 3682 const MCExpr *Value; 3683 if (parseExpression(Value)) 3684 return true; 3685 // The expression must be the constant 0 or 1. 3686 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3687 int Value = MCE->getValue(); 3688 if (Value == 0) 3689 Flags &= ~DWARF2_FLAG_IS_STMT; 3690 else if (Value == 1) 3691 Flags |= DWARF2_FLAG_IS_STMT; 3692 else 3693 return Error(Loc, "is_stmt value not 0 or 1"); 3694 } else { 3695 return Error(Loc, "is_stmt value not the constant value of 0 or 1"); 3696 } 3697 } else if (Name == "isa") { 3698 Loc = getTok().getLoc(); 3699 const MCExpr *Value; 3700 if (parseExpression(Value)) 3701 return true; 3702 // The expression must be a constant greater or equal to 0. 3703 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3704 int Value = MCE->getValue(); 3705 if (Value < 0) 3706 return Error(Loc, "isa number less than zero"); 3707 Isa = Value; 3708 } else { 3709 return Error(Loc, "isa number not a constant value"); 3710 } 3711 } else if (Name == "discriminator") { 3712 if (parseAbsoluteExpression(Discriminator)) 3713 return true; 3714 } else { 3715 return Error(Loc, "unknown sub-directive in '.loc' directive"); 3716 } 3717 return false; 3718 }; 3719 3720 if (parseMany(parseLocOp, false /*hasComma*/)) 3721 return true; 3722 3723 getStreamer().emitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags, 3724 Isa, Discriminator, StringRef()); 3725 3726 return false; 3727 } 3728 3729 /// parseDirectiveStabs 3730 /// ::= .stabs string, number, number, number 3731 bool AsmParser::parseDirectiveStabs() { 3732 return TokError("unsupported directive '.stabs'"); 3733 } 3734 3735 /// parseDirectiveCVFile 3736 /// ::= .cv_file number filename [checksum] [checksumkind] 3737 bool AsmParser::parseDirectiveCVFile() { 3738 SMLoc FileNumberLoc = getTok().getLoc(); 3739 int64_t FileNumber; 3740 std::string Filename; 3741 std::string Checksum; 3742 int64_t ChecksumKind = 0; 3743 3744 if (parseIntToken(FileNumber, 3745 "expected file number in '.cv_file' directive") || 3746 check(FileNumber < 1, FileNumberLoc, "file number less than one") || 3747 check(getTok().isNot(AsmToken::String), 3748 "unexpected token in '.cv_file' directive") || 3749 parseEscapedString(Filename)) 3750 return true; 3751 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 3752 if (check(getTok().isNot(AsmToken::String), 3753 "unexpected token in '.cv_file' directive") || 3754 parseEscapedString(Checksum) || 3755 parseIntToken(ChecksumKind, 3756 "expected checksum kind in '.cv_file' directive") || 3757 parseEOL()) 3758 return true; 3759 } 3760 3761 Checksum = fromHex(Checksum); 3762 void *CKMem = Ctx.allocate(Checksum.size(), 1); 3763 memcpy(CKMem, Checksum.data(), Checksum.size()); 3764 ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem), 3765 Checksum.size()); 3766 3767 if (!getStreamer().emitCVFileDirective(FileNumber, Filename, ChecksumAsBytes, 3768 static_cast<uint8_t>(ChecksumKind))) 3769 return Error(FileNumberLoc, "file number already allocated"); 3770 3771 return false; 3772 } 3773 3774 bool AsmParser::parseCVFunctionId(int64_t &FunctionId, 3775 StringRef DirectiveName) { 3776 SMLoc Loc; 3777 return parseTokenLoc(Loc) || 3778 parseIntToken(FunctionId, "expected function id in '" + DirectiveName + 3779 "' directive") || 3780 check(FunctionId < 0 || FunctionId >= UINT_MAX, Loc, 3781 "expected function id within range [0, UINT_MAX)"); 3782 } 3783 3784 bool AsmParser::parseCVFileId(int64_t &FileNumber, StringRef DirectiveName) { 3785 SMLoc Loc; 3786 return parseTokenLoc(Loc) || 3787 parseIntToken(FileNumber, "expected integer in '" + DirectiveName + 3788 "' directive") || 3789 check(FileNumber < 1, Loc, "file number less than one in '" + 3790 DirectiveName + "' directive") || 3791 check(!getCVContext().isValidFileNumber(FileNumber), Loc, 3792 "unassigned file number in '" + DirectiveName + "' directive"); 3793 } 3794 3795 /// parseDirectiveCVFuncId 3796 /// ::= .cv_func_id FunctionId 3797 /// 3798 /// Introduces a function ID that can be used with .cv_loc. 3799 bool AsmParser::parseDirectiveCVFuncId() { 3800 SMLoc FunctionIdLoc = getTok().getLoc(); 3801 int64_t FunctionId; 3802 3803 if (parseCVFunctionId(FunctionId, ".cv_func_id") || parseEOL()) 3804 return true; 3805 3806 if (!getStreamer().emitCVFuncIdDirective(FunctionId)) 3807 return Error(FunctionIdLoc, "function id already allocated"); 3808 3809 return false; 3810 } 3811 3812 /// parseDirectiveCVInlineSiteId 3813 /// ::= .cv_inline_site_id FunctionId 3814 /// "within" IAFunc 3815 /// "inlined_at" IAFile IALine [IACol] 3816 /// 3817 /// Introduces a function ID that can be used with .cv_loc. Includes "inlined 3818 /// at" source location information for use in the line table of the caller, 3819 /// whether the caller is a real function or another inlined call site. 3820 bool AsmParser::parseDirectiveCVInlineSiteId() { 3821 SMLoc FunctionIdLoc = getTok().getLoc(); 3822 int64_t FunctionId; 3823 int64_t IAFunc; 3824 int64_t IAFile; 3825 int64_t IALine; 3826 int64_t IACol = 0; 3827 3828 // FunctionId 3829 if (parseCVFunctionId(FunctionId, ".cv_inline_site_id")) 3830 return true; 3831 3832 // "within" 3833 if (check((getLexer().isNot(AsmToken::Identifier) || 3834 getTok().getIdentifier() != "within"), 3835 "expected 'within' identifier in '.cv_inline_site_id' directive")) 3836 return true; 3837 Lex(); 3838 3839 // IAFunc 3840 if (parseCVFunctionId(IAFunc, ".cv_inline_site_id")) 3841 return true; 3842 3843 // "inlined_at" 3844 if (check((getLexer().isNot(AsmToken::Identifier) || 3845 getTok().getIdentifier() != "inlined_at"), 3846 "expected 'inlined_at' identifier in '.cv_inline_site_id' " 3847 "directive") ) 3848 return true; 3849 Lex(); 3850 3851 // IAFile IALine 3852 if (parseCVFileId(IAFile, ".cv_inline_site_id") || 3853 parseIntToken(IALine, "expected line number after 'inlined_at'")) 3854 return true; 3855 3856 // [IACol] 3857 if (getLexer().is(AsmToken::Integer)) { 3858 IACol = getTok().getIntVal(); 3859 Lex(); 3860 } 3861 3862 if (parseEOL()) 3863 return true; 3864 3865 if (!getStreamer().emitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile, 3866 IALine, IACol, FunctionIdLoc)) 3867 return Error(FunctionIdLoc, "function id already allocated"); 3868 3869 return false; 3870 } 3871 3872 /// parseDirectiveCVLoc 3873 /// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end] 3874 /// [is_stmt VALUE] 3875 /// The first number is a file number, must have been previously assigned with 3876 /// a .file directive, the second number is the line number and optionally the 3877 /// third number is a column position (zero if not specified). The remaining 3878 /// optional items are .loc sub-directives. 3879 bool AsmParser::parseDirectiveCVLoc() { 3880 SMLoc DirectiveLoc = getTok().getLoc(); 3881 int64_t FunctionId, FileNumber; 3882 if (parseCVFunctionId(FunctionId, ".cv_loc") || 3883 parseCVFileId(FileNumber, ".cv_loc")) 3884 return true; 3885 3886 int64_t LineNumber = 0; 3887 if (getLexer().is(AsmToken::Integer)) { 3888 LineNumber = getTok().getIntVal(); 3889 if (LineNumber < 0) 3890 return TokError("line number less than zero in '.cv_loc' directive"); 3891 Lex(); 3892 } 3893 3894 int64_t ColumnPos = 0; 3895 if (getLexer().is(AsmToken::Integer)) { 3896 ColumnPos = getTok().getIntVal(); 3897 if (ColumnPos < 0) 3898 return TokError("column position less than zero in '.cv_loc' directive"); 3899 Lex(); 3900 } 3901 3902 bool PrologueEnd = false; 3903 uint64_t IsStmt = 0; 3904 3905 auto parseOp = [&]() -> bool { 3906 StringRef Name; 3907 SMLoc Loc = getTok().getLoc(); 3908 if (parseIdentifier(Name)) 3909 return TokError("unexpected token in '.cv_loc' directive"); 3910 if (Name == "prologue_end") 3911 PrologueEnd = true; 3912 else if (Name == "is_stmt") { 3913 Loc = getTok().getLoc(); 3914 const MCExpr *Value; 3915 if (parseExpression(Value)) 3916 return true; 3917 // The expression must be the constant 0 or 1. 3918 IsStmt = ~0ULL; 3919 if (const auto *MCE = dyn_cast<MCConstantExpr>(Value)) 3920 IsStmt = MCE->getValue(); 3921 3922 if (IsStmt > 1) 3923 return Error(Loc, "is_stmt value not 0 or 1"); 3924 } else { 3925 return Error(Loc, "unknown sub-directive in '.cv_loc' directive"); 3926 } 3927 return false; 3928 }; 3929 3930 if (parseMany(parseOp, false /*hasComma*/)) 3931 return true; 3932 3933 getStreamer().emitCVLocDirective(FunctionId, FileNumber, LineNumber, 3934 ColumnPos, PrologueEnd, IsStmt, StringRef(), 3935 DirectiveLoc); 3936 return false; 3937 } 3938 3939 /// parseDirectiveCVLinetable 3940 /// ::= .cv_linetable FunctionId, FnStart, FnEnd 3941 bool AsmParser::parseDirectiveCVLinetable() { 3942 int64_t FunctionId; 3943 StringRef FnStartName, FnEndName; 3944 SMLoc Loc = getTok().getLoc(); 3945 if (parseCVFunctionId(FunctionId, ".cv_linetable") || parseComma() || 3946 parseTokenLoc(Loc) || 3947 check(parseIdentifier(FnStartName), Loc, 3948 "expected identifier in directive") || 3949 parseComma() || parseTokenLoc(Loc) || 3950 check(parseIdentifier(FnEndName), Loc, 3951 "expected identifier in directive")) 3952 return true; 3953 3954 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 3955 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 3956 3957 getStreamer().emitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym); 3958 return false; 3959 } 3960 3961 /// parseDirectiveCVInlineLinetable 3962 /// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd 3963 bool AsmParser::parseDirectiveCVInlineLinetable() { 3964 int64_t PrimaryFunctionId, SourceFileId, SourceLineNum; 3965 StringRef FnStartName, FnEndName; 3966 SMLoc Loc = getTok().getLoc(); 3967 if (parseCVFunctionId(PrimaryFunctionId, ".cv_inline_linetable") || 3968 parseTokenLoc(Loc) || 3969 parseIntToken( 3970 SourceFileId, 3971 "expected SourceField in '.cv_inline_linetable' directive") || 3972 check(SourceFileId <= 0, Loc, 3973 "File id less than zero in '.cv_inline_linetable' directive") || 3974 parseTokenLoc(Loc) || 3975 parseIntToken( 3976 SourceLineNum, 3977 "expected SourceLineNum in '.cv_inline_linetable' directive") || 3978 check(SourceLineNum < 0, Loc, 3979 "Line number less than zero in '.cv_inline_linetable' directive") || 3980 parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc, 3981 "expected identifier in directive") || 3982 parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc, 3983 "expected identifier in directive")) 3984 return true; 3985 3986 if (parseEOL()) 3987 return true; 3988 3989 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 3990 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 3991 getStreamer().emitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId, 3992 SourceLineNum, FnStartSym, 3993 FnEndSym); 3994 return false; 3995 } 3996 3997 void AsmParser::initializeCVDefRangeTypeMap() { 3998 CVDefRangeTypeMap["reg"] = CVDR_DEFRANGE_REGISTER; 3999 CVDefRangeTypeMap["frame_ptr_rel"] = CVDR_DEFRANGE_FRAMEPOINTER_REL; 4000 CVDefRangeTypeMap["subfield_reg"] = CVDR_DEFRANGE_SUBFIELD_REGISTER; 4001 CVDefRangeTypeMap["reg_rel"] = CVDR_DEFRANGE_REGISTER_REL; 4002 } 4003 4004 /// parseDirectiveCVDefRange 4005 /// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes* 4006 bool AsmParser::parseDirectiveCVDefRange() { 4007 SMLoc Loc; 4008 std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges; 4009 while (getLexer().is(AsmToken::Identifier)) { 4010 Loc = getLexer().getLoc(); 4011 StringRef GapStartName; 4012 if (parseIdentifier(GapStartName)) 4013 return Error(Loc, "expected identifier in directive"); 4014 MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName); 4015 4016 Loc = getLexer().getLoc(); 4017 StringRef GapEndName; 4018 if (parseIdentifier(GapEndName)) 4019 return Error(Loc, "expected identifier in directive"); 4020 MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName); 4021 4022 Ranges.push_back({GapStartSym, GapEndSym}); 4023 } 4024 4025 StringRef CVDefRangeTypeStr; 4026 if (parseToken( 4027 AsmToken::Comma, 4028 "expected comma before def_range type in .cv_def_range directive") || 4029 parseIdentifier(CVDefRangeTypeStr)) 4030 return Error(Loc, "expected def_range type in directive"); 4031 4032 StringMap<CVDefRangeType>::const_iterator CVTypeIt = 4033 CVDefRangeTypeMap.find(CVDefRangeTypeStr); 4034 CVDefRangeType CVDRType = (CVTypeIt == CVDefRangeTypeMap.end()) 4035 ? CVDR_DEFRANGE 4036 : CVTypeIt->getValue(); 4037 switch (CVDRType) { 4038 case CVDR_DEFRANGE_REGISTER: { 4039 int64_t DRRegister; 4040 if (parseToken(AsmToken::Comma, "expected comma before register number in " 4041 ".cv_def_range directive") || 4042 parseAbsoluteExpression(DRRegister)) 4043 return Error(Loc, "expected register number"); 4044 4045 codeview::DefRangeRegisterHeader DRHdr; 4046 DRHdr.Register = DRRegister; 4047 DRHdr.MayHaveNoName = 0; 4048 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4049 break; 4050 } 4051 case CVDR_DEFRANGE_FRAMEPOINTER_REL: { 4052 int64_t DROffset; 4053 if (parseToken(AsmToken::Comma, 4054 "expected comma before offset in .cv_def_range directive") || 4055 parseAbsoluteExpression(DROffset)) 4056 return Error(Loc, "expected offset value"); 4057 4058 codeview::DefRangeFramePointerRelHeader DRHdr; 4059 DRHdr.Offset = DROffset; 4060 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4061 break; 4062 } 4063 case CVDR_DEFRANGE_SUBFIELD_REGISTER: { 4064 int64_t DRRegister; 4065 int64_t DROffsetInParent; 4066 if (parseToken(AsmToken::Comma, "expected comma before register number in " 4067 ".cv_def_range directive") || 4068 parseAbsoluteExpression(DRRegister)) 4069 return Error(Loc, "expected register number"); 4070 if (parseToken(AsmToken::Comma, 4071 "expected comma before offset in .cv_def_range directive") || 4072 parseAbsoluteExpression(DROffsetInParent)) 4073 return Error(Loc, "expected offset value"); 4074 4075 codeview::DefRangeSubfieldRegisterHeader DRHdr; 4076 DRHdr.Register = DRRegister; 4077 DRHdr.MayHaveNoName = 0; 4078 DRHdr.OffsetInParent = DROffsetInParent; 4079 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4080 break; 4081 } 4082 case CVDR_DEFRANGE_REGISTER_REL: { 4083 int64_t DRRegister; 4084 int64_t DRFlags; 4085 int64_t DRBasePointerOffset; 4086 if (parseToken(AsmToken::Comma, "expected comma before register number in " 4087 ".cv_def_range directive") || 4088 parseAbsoluteExpression(DRRegister)) 4089 return Error(Loc, "expected register value"); 4090 if (parseToken( 4091 AsmToken::Comma, 4092 "expected comma before flag value in .cv_def_range directive") || 4093 parseAbsoluteExpression(DRFlags)) 4094 return Error(Loc, "expected flag value"); 4095 if (parseToken(AsmToken::Comma, "expected comma before base pointer offset " 4096 "in .cv_def_range directive") || 4097 parseAbsoluteExpression(DRBasePointerOffset)) 4098 return Error(Loc, "expected base pointer offset value"); 4099 4100 codeview::DefRangeRegisterRelHeader DRHdr; 4101 DRHdr.Register = DRRegister; 4102 DRHdr.Flags = DRFlags; 4103 DRHdr.BasePointerOffset = DRBasePointerOffset; 4104 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4105 break; 4106 } 4107 default: 4108 return Error(Loc, "unexpected def_range type in .cv_def_range directive"); 4109 } 4110 return true; 4111 } 4112 4113 /// parseDirectiveCVString 4114 /// ::= .cv_stringtable "string" 4115 bool AsmParser::parseDirectiveCVString() { 4116 std::string Data; 4117 if (checkForValidSection() || parseEscapedString(Data)) 4118 return true; 4119 4120 // Put the string in the table and emit the offset. 4121 std::pair<StringRef, unsigned> Insertion = 4122 getCVContext().addToStringTable(Data); 4123 getStreamer().emitInt32(Insertion.second); 4124 return false; 4125 } 4126 4127 /// parseDirectiveCVStringTable 4128 /// ::= .cv_stringtable 4129 bool AsmParser::parseDirectiveCVStringTable() { 4130 getStreamer().emitCVStringTableDirective(); 4131 return false; 4132 } 4133 4134 /// parseDirectiveCVFileChecksums 4135 /// ::= .cv_filechecksums 4136 bool AsmParser::parseDirectiveCVFileChecksums() { 4137 getStreamer().emitCVFileChecksumsDirective(); 4138 return false; 4139 } 4140 4141 /// parseDirectiveCVFileChecksumOffset 4142 /// ::= .cv_filechecksumoffset fileno 4143 bool AsmParser::parseDirectiveCVFileChecksumOffset() { 4144 int64_t FileNo; 4145 if (parseIntToken(FileNo, "expected identifier in directive")) 4146 return true; 4147 if (parseEOL()) 4148 return true; 4149 getStreamer().emitCVFileChecksumOffsetDirective(FileNo); 4150 return false; 4151 } 4152 4153 /// parseDirectiveCVFPOData 4154 /// ::= .cv_fpo_data procsym 4155 bool AsmParser::parseDirectiveCVFPOData() { 4156 SMLoc DirLoc = getLexer().getLoc(); 4157 StringRef ProcName; 4158 if (parseIdentifier(ProcName)) 4159 return TokError("expected symbol name"); 4160 if (parseEOL()) 4161 return true; 4162 MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName); 4163 getStreamer().emitCVFPOData(ProcSym, DirLoc); 4164 return false; 4165 } 4166 4167 /// parseDirectiveCFISections 4168 /// ::= .cfi_sections section [, section] 4169 bool AsmParser::parseDirectiveCFISections() { 4170 StringRef Name; 4171 bool EH = false; 4172 bool Debug = false; 4173 4174 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4175 for (;;) { 4176 if (parseIdentifier(Name)) 4177 return TokError("expected .eh_frame or .debug_frame"); 4178 if (Name == ".eh_frame") 4179 EH = true; 4180 else if (Name == ".debug_frame") 4181 Debug = true; 4182 if (parseOptionalToken(AsmToken::EndOfStatement)) 4183 break; 4184 if (parseComma()) 4185 return true; 4186 } 4187 } 4188 getStreamer().emitCFISections(EH, Debug); 4189 return false; 4190 } 4191 4192 /// parseDirectiveCFIStartProc 4193 /// ::= .cfi_startproc [simple] 4194 bool AsmParser::parseDirectiveCFIStartProc() { 4195 StringRef Simple; 4196 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4197 if (check(parseIdentifier(Simple) || Simple != "simple", 4198 "unexpected token") || 4199 parseEOL()) 4200 return true; 4201 } 4202 4203 // TODO(kristina): Deal with a corner case of incorrect diagnostic context 4204 // being produced if this directive is emitted as part of preprocessor macro 4205 // expansion which can *ONLY* happen if Clang's cc1as is the API consumer. 4206 // Tools like llvm-mc on the other hand are not affected by it, and report 4207 // correct context information. 4208 getStreamer().emitCFIStartProc(!Simple.empty(), Lexer.getLoc()); 4209 return false; 4210 } 4211 4212 /// parseDirectiveCFIEndProc 4213 /// ::= .cfi_endproc 4214 bool AsmParser::parseDirectiveCFIEndProc() { 4215 if (parseEOL()) 4216 return true; 4217 getStreamer().emitCFIEndProc(); 4218 return false; 4219 } 4220 4221 /// parse register name or number. 4222 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register, 4223 SMLoc DirectiveLoc) { 4224 unsigned RegNo; 4225 4226 if (getLexer().isNot(AsmToken::Integer)) { 4227 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc)) 4228 return true; 4229 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true); 4230 } else 4231 return parseAbsoluteExpression(Register); 4232 4233 return false; 4234 } 4235 4236 /// parseDirectiveCFIDefCfa 4237 /// ::= .cfi_def_cfa register, offset 4238 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) { 4239 int64_t Register = 0, Offset = 0; 4240 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4241 parseAbsoluteExpression(Offset) || parseEOL()) 4242 return true; 4243 4244 getStreamer().emitCFIDefCfa(Register, Offset); 4245 return false; 4246 } 4247 4248 /// parseDirectiveCFIDefCfaOffset 4249 /// ::= .cfi_def_cfa_offset offset 4250 bool AsmParser::parseDirectiveCFIDefCfaOffset() { 4251 int64_t Offset = 0; 4252 if (parseAbsoluteExpression(Offset) || parseEOL()) 4253 return true; 4254 4255 getStreamer().emitCFIDefCfaOffset(Offset); 4256 return false; 4257 } 4258 4259 /// parseDirectiveCFIRegister 4260 /// ::= .cfi_register register, register 4261 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) { 4262 int64_t Register1 = 0, Register2 = 0; 4263 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc) || parseComma() || 4264 parseRegisterOrRegisterNumber(Register2, DirectiveLoc) || parseEOL()) 4265 return true; 4266 4267 getStreamer().emitCFIRegister(Register1, Register2); 4268 return false; 4269 } 4270 4271 /// parseDirectiveCFIWindowSave 4272 /// ::= .cfi_window_save 4273 bool AsmParser::parseDirectiveCFIWindowSave() { 4274 if (parseEOL()) 4275 return true; 4276 getStreamer().emitCFIWindowSave(); 4277 return false; 4278 } 4279 4280 /// parseDirectiveCFIAdjustCfaOffset 4281 /// ::= .cfi_adjust_cfa_offset adjustment 4282 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() { 4283 int64_t Adjustment = 0; 4284 if (parseAbsoluteExpression(Adjustment) || parseEOL()) 4285 return true; 4286 4287 getStreamer().emitCFIAdjustCfaOffset(Adjustment); 4288 return false; 4289 } 4290 4291 /// parseDirectiveCFIDefCfaRegister 4292 /// ::= .cfi_def_cfa_register register 4293 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) { 4294 int64_t Register = 0; 4295 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4296 return true; 4297 4298 getStreamer().emitCFIDefCfaRegister(Register); 4299 return false; 4300 } 4301 4302 /// parseDirectiveCFILLVMDefAspaceCfa 4303 /// ::= .cfi_llvm_def_aspace_cfa register, offset, address_space 4304 bool AsmParser::parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc) { 4305 int64_t Register = 0, Offset = 0, AddressSpace = 0; 4306 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4307 parseAbsoluteExpression(Offset) || parseComma() || 4308 parseAbsoluteExpression(AddressSpace) || parseEOL()) 4309 return true; 4310 4311 getStreamer().emitCFILLVMDefAspaceCfa(Register, Offset, AddressSpace); 4312 return false; 4313 } 4314 4315 /// parseDirectiveCFIOffset 4316 /// ::= .cfi_offset register, offset 4317 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) { 4318 int64_t Register = 0; 4319 int64_t Offset = 0; 4320 4321 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4322 parseAbsoluteExpression(Offset) || parseEOL()) 4323 return true; 4324 4325 getStreamer().emitCFIOffset(Register, Offset); 4326 return false; 4327 } 4328 4329 /// parseDirectiveCFIRelOffset 4330 /// ::= .cfi_rel_offset register, offset 4331 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) { 4332 int64_t Register = 0, Offset = 0; 4333 4334 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4335 parseAbsoluteExpression(Offset) || parseEOL()) 4336 return true; 4337 4338 getStreamer().emitCFIRelOffset(Register, Offset); 4339 return false; 4340 } 4341 4342 static bool isValidEncoding(int64_t Encoding) { 4343 if (Encoding & ~0xff) 4344 return false; 4345 4346 if (Encoding == dwarf::DW_EH_PE_omit) 4347 return true; 4348 4349 const unsigned Format = Encoding & 0xf; 4350 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && 4351 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && 4352 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && 4353 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) 4354 return false; 4355 4356 const unsigned Application = Encoding & 0x70; 4357 if (Application != dwarf::DW_EH_PE_absptr && 4358 Application != dwarf::DW_EH_PE_pcrel) 4359 return false; 4360 4361 return true; 4362 } 4363 4364 /// parseDirectiveCFIPersonalityOrLsda 4365 /// IsPersonality true for cfi_personality, false for cfi_lsda 4366 /// ::= .cfi_personality encoding, [symbol_name] 4367 /// ::= .cfi_lsda encoding, [symbol_name] 4368 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) { 4369 int64_t Encoding = 0; 4370 if (parseAbsoluteExpression(Encoding)) 4371 return true; 4372 if (Encoding == dwarf::DW_EH_PE_omit) 4373 return false; 4374 4375 StringRef Name; 4376 if (check(!isValidEncoding(Encoding), "unsupported encoding.") || 4377 parseComma() || 4378 check(parseIdentifier(Name), "expected identifier in directive") || 4379 parseEOL()) 4380 return true; 4381 4382 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4383 4384 if (IsPersonality) 4385 getStreamer().emitCFIPersonality(Sym, Encoding); 4386 else 4387 getStreamer().emitCFILsda(Sym, Encoding); 4388 return false; 4389 } 4390 4391 /// parseDirectiveCFIRememberState 4392 /// ::= .cfi_remember_state 4393 bool AsmParser::parseDirectiveCFIRememberState() { 4394 if (parseEOL()) 4395 return true; 4396 getStreamer().emitCFIRememberState(); 4397 return false; 4398 } 4399 4400 /// parseDirectiveCFIRestoreState 4401 /// ::= .cfi_remember_state 4402 bool AsmParser::parseDirectiveCFIRestoreState() { 4403 if (parseEOL()) 4404 return true; 4405 getStreamer().emitCFIRestoreState(); 4406 return false; 4407 } 4408 4409 /// parseDirectiveCFISameValue 4410 /// ::= .cfi_same_value register 4411 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) { 4412 int64_t Register = 0; 4413 4414 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4415 return true; 4416 4417 getStreamer().emitCFISameValue(Register); 4418 return false; 4419 } 4420 4421 /// parseDirectiveCFIRestore 4422 /// ::= .cfi_restore register 4423 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) { 4424 int64_t Register = 0; 4425 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4426 return true; 4427 4428 getStreamer().emitCFIRestore(Register); 4429 return false; 4430 } 4431 4432 /// parseDirectiveCFIEscape 4433 /// ::= .cfi_escape expression[,...] 4434 bool AsmParser::parseDirectiveCFIEscape() { 4435 std::string Values; 4436 int64_t CurrValue; 4437 if (parseAbsoluteExpression(CurrValue)) 4438 return true; 4439 4440 Values.push_back((uint8_t)CurrValue); 4441 4442 while (getLexer().is(AsmToken::Comma)) { 4443 Lex(); 4444 4445 if (parseAbsoluteExpression(CurrValue)) 4446 return true; 4447 4448 Values.push_back((uint8_t)CurrValue); 4449 } 4450 4451 getStreamer().emitCFIEscape(Values); 4452 return false; 4453 } 4454 4455 /// parseDirectiveCFIReturnColumn 4456 /// ::= .cfi_return_column register 4457 bool AsmParser::parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc) { 4458 int64_t Register = 0; 4459 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4460 return true; 4461 getStreamer().emitCFIReturnColumn(Register); 4462 return false; 4463 } 4464 4465 /// parseDirectiveCFISignalFrame 4466 /// ::= .cfi_signal_frame 4467 bool AsmParser::parseDirectiveCFISignalFrame() { 4468 if (parseEOL()) 4469 return true; 4470 4471 getStreamer().emitCFISignalFrame(); 4472 return false; 4473 } 4474 4475 /// parseDirectiveCFIUndefined 4476 /// ::= .cfi_undefined register 4477 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) { 4478 int64_t Register = 0; 4479 4480 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4481 return true; 4482 4483 getStreamer().emitCFIUndefined(Register); 4484 return false; 4485 } 4486 4487 /// parseDirectiveAltmacro 4488 /// ::= .altmacro 4489 /// ::= .noaltmacro 4490 bool AsmParser::parseDirectiveAltmacro(StringRef Directive) { 4491 if (parseEOL()) 4492 return true; 4493 AltMacroMode = (Directive == ".altmacro"); 4494 return false; 4495 } 4496 4497 /// parseDirectiveMacrosOnOff 4498 /// ::= .macros_on 4499 /// ::= .macros_off 4500 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) { 4501 if (parseEOL()) 4502 return true; 4503 setMacrosEnabled(Directive == ".macros_on"); 4504 return false; 4505 } 4506 4507 /// parseDirectiveMacro 4508 /// ::= .macro name[,] [parameters] 4509 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) { 4510 StringRef Name; 4511 if (parseIdentifier(Name)) 4512 return TokError("expected identifier in '.macro' directive"); 4513 4514 if (getLexer().is(AsmToken::Comma)) 4515 Lex(); 4516 4517 MCAsmMacroParameters Parameters; 4518 while (getLexer().isNot(AsmToken::EndOfStatement)) { 4519 4520 if (!Parameters.empty() && Parameters.back().Vararg) 4521 return Error(Lexer.getLoc(), "vararg parameter '" + 4522 Parameters.back().Name + 4523 "' should be the last parameter"); 4524 4525 MCAsmMacroParameter Parameter; 4526 if (parseIdentifier(Parameter.Name)) 4527 return TokError("expected identifier in '.macro' directive"); 4528 4529 // Emit an error if two (or more) named parameters share the same name 4530 for (const MCAsmMacroParameter& CurrParam : Parameters) 4531 if (CurrParam.Name.equals(Parameter.Name)) 4532 return TokError("macro '" + Name + "' has multiple parameters" 4533 " named '" + Parameter.Name + "'"); 4534 4535 if (Lexer.is(AsmToken::Colon)) { 4536 Lex(); // consume ':' 4537 4538 SMLoc QualLoc; 4539 StringRef Qualifier; 4540 4541 QualLoc = Lexer.getLoc(); 4542 if (parseIdentifier(Qualifier)) 4543 return Error(QualLoc, "missing parameter qualifier for " 4544 "'" + Parameter.Name + "' in macro '" + Name + "'"); 4545 4546 if (Qualifier == "req") 4547 Parameter.Required = true; 4548 else if (Qualifier == "vararg") 4549 Parameter.Vararg = true; 4550 else 4551 return Error(QualLoc, Qualifier + " is not a valid parameter qualifier " 4552 "for '" + Parameter.Name + "' in macro '" + Name + "'"); 4553 } 4554 4555 if (getLexer().is(AsmToken::Equal)) { 4556 Lex(); 4557 4558 SMLoc ParamLoc; 4559 4560 ParamLoc = Lexer.getLoc(); 4561 if (parseMacroArgument(Parameter.Value, /*Vararg=*/false )) 4562 return true; 4563 4564 if (Parameter.Required) 4565 Warning(ParamLoc, "pointless default value for required parameter " 4566 "'" + Parameter.Name + "' in macro '" + Name + "'"); 4567 } 4568 4569 Parameters.push_back(std::move(Parameter)); 4570 4571 if (getLexer().is(AsmToken::Comma)) 4572 Lex(); 4573 } 4574 4575 // Eat just the end of statement. 4576 Lexer.Lex(); 4577 4578 // Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors 4579 AsmToken EndToken, StartToken = getTok(); 4580 unsigned MacroDepth = 0; 4581 // Lex the macro definition. 4582 while (true) { 4583 // Ignore Lexing errors in macros. 4584 while (Lexer.is(AsmToken::Error)) { 4585 Lexer.Lex(); 4586 } 4587 4588 // Check whether we have reached the end of the file. 4589 if (getLexer().is(AsmToken::Eof)) 4590 return Error(DirectiveLoc, "no matching '.endmacro' in definition"); 4591 4592 // Otherwise, check whether we have reach the .endmacro or the start of a 4593 // preprocessor line marker. 4594 if (getLexer().is(AsmToken::Identifier)) { 4595 if (getTok().getIdentifier() == ".endm" || 4596 getTok().getIdentifier() == ".endmacro") { 4597 if (MacroDepth == 0) { // Outermost macro. 4598 EndToken = getTok(); 4599 Lexer.Lex(); 4600 if (getLexer().isNot(AsmToken::EndOfStatement)) 4601 return TokError("unexpected token in '" + EndToken.getIdentifier() + 4602 "' directive"); 4603 break; 4604 } else { 4605 // Otherwise we just found the end of an inner macro. 4606 --MacroDepth; 4607 } 4608 } else if (getTok().getIdentifier() == ".macro") { 4609 // We allow nested macros. Those aren't instantiated until the outermost 4610 // macro is expanded so just ignore them for now. 4611 ++MacroDepth; 4612 } 4613 } else if (Lexer.is(AsmToken::HashDirective)) { 4614 (void)parseCppHashLineFilenameComment(getLexer().getLoc()); 4615 } 4616 4617 // Otherwise, scan til the end of the statement. 4618 eatToEndOfStatement(); 4619 } 4620 4621 if (getContext().lookupMacro(Name)) { 4622 return Error(DirectiveLoc, "macro '" + Name + "' is already defined"); 4623 } 4624 4625 const char *BodyStart = StartToken.getLoc().getPointer(); 4626 const char *BodyEnd = EndToken.getLoc().getPointer(); 4627 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 4628 checkForBadMacro(DirectiveLoc, Name, Body, Parameters); 4629 MCAsmMacro Macro(Name, Body, std::move(Parameters)); 4630 DEBUG_WITH_TYPE("asm-macros", dbgs() << "Defining new macro:\n"; 4631 Macro.dump()); 4632 getContext().defineMacro(Name, std::move(Macro)); 4633 return false; 4634 } 4635 4636 /// checkForBadMacro 4637 /// 4638 /// With the support added for named parameters there may be code out there that 4639 /// is transitioning from positional parameters. In versions of gas that did 4640 /// not support named parameters they would be ignored on the macro definition. 4641 /// But to support both styles of parameters this is not possible so if a macro 4642 /// definition has named parameters but does not use them and has what appears 4643 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a 4644 /// warning that the positional parameter found in body which have no effect. 4645 /// Hoping the developer will either remove the named parameters from the macro 4646 /// definition so the positional parameters get used if that was what was 4647 /// intended or change the macro to use the named parameters. It is possible 4648 /// this warning will trigger when the none of the named parameters are used 4649 /// and the strings like $1 are infact to simply to be passed trough unchanged. 4650 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, 4651 StringRef Body, 4652 ArrayRef<MCAsmMacroParameter> Parameters) { 4653 // If this macro is not defined with named parameters the warning we are 4654 // checking for here doesn't apply. 4655 unsigned NParameters = Parameters.size(); 4656 if (NParameters == 0) 4657 return; 4658 4659 bool NamedParametersFound = false; 4660 bool PositionalParametersFound = false; 4661 4662 // Look at the body of the macro for use of both the named parameters and what 4663 // are likely to be positional parameters. This is what expandMacro() is 4664 // doing when it finds the parameters in the body. 4665 while (!Body.empty()) { 4666 // Scan for the next possible parameter. 4667 std::size_t End = Body.size(), Pos = 0; 4668 for (; Pos != End; ++Pos) { 4669 // Check for a substitution or escape. 4670 // This macro is defined with parameters, look for \foo, \bar, etc. 4671 if (Body[Pos] == '\\' && Pos + 1 != End) 4672 break; 4673 4674 // This macro should have parameters, but look for $0, $1, ..., $n too. 4675 if (Body[Pos] != '$' || Pos + 1 == End) 4676 continue; 4677 char Next = Body[Pos + 1]; 4678 if (Next == '$' || Next == 'n' || 4679 isdigit(static_cast<unsigned char>(Next))) 4680 break; 4681 } 4682 4683 // Check if we reached the end. 4684 if (Pos == End) 4685 break; 4686 4687 if (Body[Pos] == '$') { 4688 switch (Body[Pos + 1]) { 4689 // $$ => $ 4690 case '$': 4691 break; 4692 4693 // $n => number of arguments 4694 case 'n': 4695 PositionalParametersFound = true; 4696 break; 4697 4698 // $[0-9] => argument 4699 default: { 4700 PositionalParametersFound = true; 4701 break; 4702 } 4703 } 4704 Pos += 2; 4705 } else { 4706 unsigned I = Pos + 1; 4707 while (isIdentifierChar(Body[I]) && I + 1 != End) 4708 ++I; 4709 4710 const char *Begin = Body.data() + Pos + 1; 4711 StringRef Argument(Begin, I - (Pos + 1)); 4712 unsigned Index = 0; 4713 for (; Index < NParameters; ++Index) 4714 if (Parameters[Index].Name == Argument) 4715 break; 4716 4717 if (Index == NParameters) { 4718 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 4719 Pos += 3; 4720 else { 4721 Pos = I; 4722 } 4723 } else { 4724 NamedParametersFound = true; 4725 Pos += 1 + Argument.size(); 4726 } 4727 } 4728 // Update the scan point. 4729 Body = Body.substr(Pos); 4730 } 4731 4732 if (!NamedParametersFound && PositionalParametersFound) 4733 Warning(DirectiveLoc, "macro defined with named parameters which are not " 4734 "used in macro body, possible positional parameter " 4735 "found in body which will have no effect"); 4736 } 4737 4738 /// parseDirectiveExitMacro 4739 /// ::= .exitm 4740 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) { 4741 if (parseEOL()) 4742 return true; 4743 4744 if (!isInsideMacroInstantiation()) 4745 return TokError("unexpected '" + Directive + "' in file, " 4746 "no current macro definition"); 4747 4748 // Exit all conditionals that are active in the current macro. 4749 while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) { 4750 TheCondState = TheCondStack.back(); 4751 TheCondStack.pop_back(); 4752 } 4753 4754 handleMacroExit(); 4755 return false; 4756 } 4757 4758 /// parseDirectiveEndMacro 4759 /// ::= .endm 4760 /// ::= .endmacro 4761 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) { 4762 if (getLexer().isNot(AsmToken::EndOfStatement)) 4763 return TokError("unexpected token in '" + Directive + "' directive"); 4764 4765 // If we are inside a macro instantiation, terminate the current 4766 // instantiation. 4767 if (isInsideMacroInstantiation()) { 4768 handleMacroExit(); 4769 return false; 4770 } 4771 4772 // Otherwise, this .endmacro is a stray entry in the file; well formed 4773 // .endmacro directives are handled during the macro definition parsing. 4774 return TokError("unexpected '" + Directive + "' in file, " 4775 "no current macro definition"); 4776 } 4777 4778 /// parseDirectivePurgeMacro 4779 /// ::= .purgem name 4780 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) { 4781 StringRef Name; 4782 SMLoc Loc; 4783 if (parseTokenLoc(Loc) || 4784 check(parseIdentifier(Name), Loc, 4785 "expected identifier in '.purgem' directive") || 4786 parseEOL()) 4787 return true; 4788 4789 if (!getContext().lookupMacro(Name)) 4790 return Error(DirectiveLoc, "macro '" + Name + "' is not defined"); 4791 4792 getContext().undefineMacro(Name); 4793 DEBUG_WITH_TYPE("asm-macros", dbgs() 4794 << "Un-defining macro: " << Name << "\n"); 4795 return false; 4796 } 4797 4798 /// parseDirectiveBundleAlignMode 4799 /// ::= {.bundle_align_mode} expression 4800 bool AsmParser::parseDirectiveBundleAlignMode() { 4801 // Expect a single argument: an expression that evaluates to a constant 4802 // in the inclusive range 0-30. 4803 SMLoc ExprLoc = getLexer().getLoc(); 4804 int64_t AlignSizePow2; 4805 if (checkForValidSection() || parseAbsoluteExpression(AlignSizePow2) || 4806 parseEOL() || 4807 check(AlignSizePow2 < 0 || AlignSizePow2 > 30, ExprLoc, 4808 "invalid bundle alignment size (expected between 0 and 30)")) 4809 return true; 4810 4811 // Because of AlignSizePow2's verified range we can safely truncate it to 4812 // unsigned. 4813 getStreamer().emitBundleAlignMode(static_cast<unsigned>(AlignSizePow2)); 4814 return false; 4815 } 4816 4817 /// parseDirectiveBundleLock 4818 /// ::= {.bundle_lock} [align_to_end] 4819 bool AsmParser::parseDirectiveBundleLock() { 4820 if (checkForValidSection()) 4821 return true; 4822 bool AlignToEnd = false; 4823 4824 StringRef Option; 4825 SMLoc Loc = getTok().getLoc(); 4826 const char *kInvalidOptionError = 4827 "invalid option for '.bundle_lock' directive"; 4828 4829 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4830 if (check(parseIdentifier(Option), Loc, kInvalidOptionError) || 4831 check(Option != "align_to_end", Loc, kInvalidOptionError) || parseEOL()) 4832 return true; 4833 AlignToEnd = true; 4834 } 4835 4836 getStreamer().emitBundleLock(AlignToEnd); 4837 return false; 4838 } 4839 4840 /// parseDirectiveBundleLock 4841 /// ::= {.bundle_lock} 4842 bool AsmParser::parseDirectiveBundleUnlock() { 4843 if (checkForValidSection() || parseEOL()) 4844 return true; 4845 4846 getStreamer().emitBundleUnlock(); 4847 return false; 4848 } 4849 4850 /// parseDirectiveSpace 4851 /// ::= (.skip | .space) expression [ , expression ] 4852 bool AsmParser::parseDirectiveSpace(StringRef IDVal) { 4853 SMLoc NumBytesLoc = Lexer.getLoc(); 4854 const MCExpr *NumBytes; 4855 if (checkForValidSection() || parseExpression(NumBytes)) 4856 return true; 4857 4858 int64_t FillExpr = 0; 4859 if (parseOptionalToken(AsmToken::Comma)) 4860 if (parseAbsoluteExpression(FillExpr)) 4861 return true; 4862 if (parseEOL()) 4863 return true; 4864 4865 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. 4866 getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc); 4867 4868 return false; 4869 } 4870 4871 /// parseDirectiveDCB 4872 /// ::= .dcb.{b, l, w} expression, expression 4873 bool AsmParser::parseDirectiveDCB(StringRef IDVal, unsigned Size) { 4874 SMLoc NumValuesLoc = Lexer.getLoc(); 4875 int64_t NumValues; 4876 if (checkForValidSection() || parseAbsoluteExpression(NumValues)) 4877 return true; 4878 4879 if (NumValues < 0) { 4880 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4881 return false; 4882 } 4883 4884 if (parseComma()) 4885 return true; 4886 4887 const MCExpr *Value; 4888 SMLoc ExprLoc = getLexer().getLoc(); 4889 if (parseExpression(Value)) 4890 return true; 4891 4892 // Special case constant expressions to match code generator. 4893 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 4894 assert(Size <= 8 && "Invalid size"); 4895 uint64_t IntValue = MCE->getValue(); 4896 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 4897 return Error(ExprLoc, "literal value out of range for directive"); 4898 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4899 getStreamer().emitIntValue(IntValue, Size); 4900 } else { 4901 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4902 getStreamer().emitValue(Value, Size, ExprLoc); 4903 } 4904 4905 return parseEOL(); 4906 } 4907 4908 /// parseDirectiveRealDCB 4909 /// ::= .dcb.{d, s} expression, expression 4910 bool AsmParser::parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &Semantics) { 4911 SMLoc NumValuesLoc = Lexer.getLoc(); 4912 int64_t NumValues; 4913 if (checkForValidSection() || parseAbsoluteExpression(NumValues)) 4914 return true; 4915 4916 if (NumValues < 0) { 4917 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4918 return false; 4919 } 4920 4921 if (parseComma()) 4922 return true; 4923 4924 APInt AsInt; 4925 if (parseRealValue(Semantics, AsInt) || parseEOL()) 4926 return true; 4927 4928 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4929 getStreamer().emitIntValue(AsInt.getLimitedValue(), 4930 AsInt.getBitWidth() / 8); 4931 4932 return false; 4933 } 4934 4935 /// parseDirectiveDS 4936 /// ::= .ds.{b, d, l, p, s, w, x} expression 4937 bool AsmParser::parseDirectiveDS(StringRef IDVal, unsigned Size) { 4938 SMLoc NumValuesLoc = Lexer.getLoc(); 4939 int64_t NumValues; 4940 if (checkForValidSection() || parseAbsoluteExpression(NumValues) || 4941 parseEOL()) 4942 return true; 4943 4944 if (NumValues < 0) { 4945 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4946 return false; 4947 } 4948 4949 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4950 getStreamer().emitFill(Size, 0); 4951 4952 return false; 4953 } 4954 4955 /// parseDirectiveLEB128 4956 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ] 4957 bool AsmParser::parseDirectiveLEB128(bool Signed) { 4958 if (checkForValidSection()) 4959 return true; 4960 4961 auto parseOp = [&]() -> bool { 4962 const MCExpr *Value; 4963 if (parseExpression(Value)) 4964 return true; 4965 if (Signed) 4966 getStreamer().emitSLEB128Value(Value); 4967 else 4968 getStreamer().emitULEB128Value(Value); 4969 return false; 4970 }; 4971 4972 return parseMany(parseOp); 4973 } 4974 4975 /// parseDirectiveSymbolAttribute 4976 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ] 4977 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) { 4978 auto parseOp = [&]() -> bool { 4979 StringRef Name; 4980 SMLoc Loc = getTok().getLoc(); 4981 if (parseIdentifier(Name)) 4982 return Error(Loc, "expected identifier"); 4983 4984 if (discardLTOSymbol(Name)) 4985 return false; 4986 4987 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4988 4989 // Assembler local symbols don't make any sense here. Complain loudly. 4990 if (Sym->isTemporary()) 4991 return Error(Loc, "non-local symbol required"); 4992 4993 if (!getStreamer().emitSymbolAttribute(Sym, Attr)) 4994 return Error(Loc, "unable to emit symbol attribute"); 4995 return false; 4996 }; 4997 4998 return parseMany(parseOp); 4999 } 5000 5001 /// parseDirectiveComm 5002 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ] 5003 bool AsmParser::parseDirectiveComm(bool IsLocal) { 5004 if (checkForValidSection()) 5005 return true; 5006 5007 SMLoc IDLoc = getLexer().getLoc(); 5008 StringRef Name; 5009 if (parseIdentifier(Name)) 5010 return TokError("expected identifier in directive"); 5011 5012 // Handle the identifier as the key symbol. 5013 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 5014 5015 if (parseComma()) 5016 return true; 5017 5018 int64_t Size; 5019 SMLoc SizeLoc = getLexer().getLoc(); 5020 if (parseAbsoluteExpression(Size)) 5021 return true; 5022 5023 int64_t Pow2Alignment = 0; 5024 SMLoc Pow2AlignmentLoc; 5025 if (getLexer().is(AsmToken::Comma)) { 5026 Lex(); 5027 Pow2AlignmentLoc = getLexer().getLoc(); 5028 if (parseAbsoluteExpression(Pow2Alignment)) 5029 return true; 5030 5031 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType(); 5032 if (IsLocal && LCOMM == LCOMM::NoAlignment) 5033 return Error(Pow2AlignmentLoc, "alignment not supported on this target"); 5034 5035 // If this target takes alignments in bytes (not log) validate and convert. 5036 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) || 5037 (IsLocal && LCOMM == LCOMM::ByteAlignment)) { 5038 if (!isPowerOf2_64(Pow2Alignment)) 5039 return Error(Pow2AlignmentLoc, "alignment must be a power of 2"); 5040 Pow2Alignment = Log2_64(Pow2Alignment); 5041 } 5042 } 5043 5044 if (parseEOL()) 5045 return true; 5046 5047 // NOTE: a size of zero for a .comm should create a undefined symbol 5048 // but a size of .lcomm creates a bss symbol of size zero. 5049 if (Size < 0) 5050 return Error(SizeLoc, "size must be non-negative"); 5051 5052 Sym->redefineIfPossible(); 5053 if (!Sym->isUndefined()) 5054 return Error(IDLoc, "invalid symbol redefinition"); 5055 5056 // Create the Symbol as a common or local common with Size and Pow2Alignment 5057 if (IsLocal) { 5058 getStreamer().emitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment); 5059 return false; 5060 } 5061 5062 getStreamer().emitCommonSymbol(Sym, Size, 1 << Pow2Alignment); 5063 return false; 5064 } 5065 5066 /// parseDirectiveAbort 5067 /// ::= .abort [... message ...] 5068 bool AsmParser::parseDirectiveAbort() { 5069 // FIXME: Use loc from directive. 5070 SMLoc Loc = getLexer().getLoc(); 5071 5072 StringRef Str = parseStringToEndOfStatement(); 5073 if (parseEOL()) 5074 return true; 5075 5076 if (Str.empty()) 5077 return Error(Loc, ".abort detected. Assembly stopping."); 5078 else 5079 return Error(Loc, ".abort '" + Str + "' detected. Assembly stopping."); 5080 // FIXME: Actually abort assembly here. 5081 5082 return false; 5083 } 5084 5085 /// parseDirectiveInclude 5086 /// ::= .include "filename" 5087 bool AsmParser::parseDirectiveInclude() { 5088 // Allow the strings to have escaped octal character sequence. 5089 std::string Filename; 5090 SMLoc IncludeLoc = getTok().getLoc(); 5091 5092 if (check(getTok().isNot(AsmToken::String), 5093 "expected string in '.include' directive") || 5094 parseEscapedString(Filename) || 5095 check(getTok().isNot(AsmToken::EndOfStatement), 5096 "unexpected token in '.include' directive") || 5097 // Attempt to switch the lexer to the included file before consuming the 5098 // end of statement to avoid losing it when we switch. 5099 check(enterIncludeFile(Filename), IncludeLoc, 5100 "Could not find include file '" + Filename + "'")) 5101 return true; 5102 5103 return false; 5104 } 5105 5106 /// parseDirectiveIncbin 5107 /// ::= .incbin "filename" [ , skip [ , count ] ] 5108 bool AsmParser::parseDirectiveIncbin() { 5109 // Allow the strings to have escaped octal character sequence. 5110 std::string Filename; 5111 SMLoc IncbinLoc = getTok().getLoc(); 5112 if (check(getTok().isNot(AsmToken::String), 5113 "expected string in '.incbin' directive") || 5114 parseEscapedString(Filename)) 5115 return true; 5116 5117 int64_t Skip = 0; 5118 const MCExpr *Count = nullptr; 5119 SMLoc SkipLoc, CountLoc; 5120 if (parseOptionalToken(AsmToken::Comma)) { 5121 // The skip expression can be omitted while specifying the count, e.g: 5122 // .incbin "filename",,4 5123 if (getTok().isNot(AsmToken::Comma)) { 5124 if (parseTokenLoc(SkipLoc) || parseAbsoluteExpression(Skip)) 5125 return true; 5126 } 5127 if (parseOptionalToken(AsmToken::Comma)) { 5128 CountLoc = getTok().getLoc(); 5129 if (parseExpression(Count)) 5130 return true; 5131 } 5132 } 5133 5134 if (parseEOL()) 5135 return true; 5136 5137 if (check(Skip < 0, SkipLoc, "skip is negative")) 5138 return true; 5139 5140 // Attempt to process the included file. 5141 if (processIncbinFile(Filename, Skip, Count, CountLoc)) 5142 return Error(IncbinLoc, "Could not find incbin file '" + Filename + "'"); 5143 return false; 5144 } 5145 5146 /// parseDirectiveIf 5147 /// ::= .if{,eq,ge,gt,le,lt,ne} expression 5148 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) { 5149 TheCondStack.push_back(TheCondState); 5150 TheCondState.TheCond = AsmCond::IfCond; 5151 if (TheCondState.Ignore) { 5152 eatToEndOfStatement(); 5153 } else { 5154 int64_t ExprValue; 5155 if (parseAbsoluteExpression(ExprValue) || parseEOL()) 5156 return true; 5157 5158 switch (DirKind) { 5159 default: 5160 llvm_unreachable("unsupported directive"); 5161 case DK_IF: 5162 case DK_IFNE: 5163 break; 5164 case DK_IFEQ: 5165 ExprValue = ExprValue == 0; 5166 break; 5167 case DK_IFGE: 5168 ExprValue = ExprValue >= 0; 5169 break; 5170 case DK_IFGT: 5171 ExprValue = ExprValue > 0; 5172 break; 5173 case DK_IFLE: 5174 ExprValue = ExprValue <= 0; 5175 break; 5176 case DK_IFLT: 5177 ExprValue = ExprValue < 0; 5178 break; 5179 } 5180 5181 TheCondState.CondMet = ExprValue; 5182 TheCondState.Ignore = !TheCondState.CondMet; 5183 } 5184 5185 return false; 5186 } 5187 5188 /// parseDirectiveIfb 5189 /// ::= .ifb string 5190 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) { 5191 TheCondStack.push_back(TheCondState); 5192 TheCondState.TheCond = AsmCond::IfCond; 5193 5194 if (TheCondState.Ignore) { 5195 eatToEndOfStatement(); 5196 } else { 5197 StringRef Str = parseStringToEndOfStatement(); 5198 5199 if (parseEOL()) 5200 return true; 5201 5202 TheCondState.CondMet = ExpectBlank == Str.empty(); 5203 TheCondState.Ignore = !TheCondState.CondMet; 5204 } 5205 5206 return false; 5207 } 5208 5209 /// parseDirectiveIfc 5210 /// ::= .ifc string1, string2 5211 /// ::= .ifnc string1, string2 5212 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) { 5213 TheCondStack.push_back(TheCondState); 5214 TheCondState.TheCond = AsmCond::IfCond; 5215 5216 if (TheCondState.Ignore) { 5217 eatToEndOfStatement(); 5218 } else { 5219 StringRef Str1 = parseStringToComma(); 5220 5221 if (parseComma()) 5222 return true; 5223 5224 StringRef Str2 = parseStringToEndOfStatement(); 5225 5226 if (parseEOL()) 5227 return true; 5228 5229 TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim()); 5230 TheCondState.Ignore = !TheCondState.CondMet; 5231 } 5232 5233 return false; 5234 } 5235 5236 /// parseDirectiveIfeqs 5237 /// ::= .ifeqs string1, string2 5238 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) { 5239 if (Lexer.isNot(AsmToken::String)) { 5240 if (ExpectEqual) 5241 return TokError("expected string parameter for '.ifeqs' directive"); 5242 return TokError("expected string parameter for '.ifnes' directive"); 5243 } 5244 5245 StringRef String1 = getTok().getStringContents(); 5246 Lex(); 5247 5248 if (Lexer.isNot(AsmToken::Comma)) { 5249 if (ExpectEqual) 5250 return TokError( 5251 "expected comma after first string for '.ifeqs' directive"); 5252 return TokError("expected comma after first string for '.ifnes' directive"); 5253 } 5254 5255 Lex(); 5256 5257 if (Lexer.isNot(AsmToken::String)) { 5258 if (ExpectEqual) 5259 return TokError("expected string parameter for '.ifeqs' directive"); 5260 return TokError("expected string parameter for '.ifnes' directive"); 5261 } 5262 5263 StringRef String2 = getTok().getStringContents(); 5264 Lex(); 5265 5266 TheCondStack.push_back(TheCondState); 5267 TheCondState.TheCond = AsmCond::IfCond; 5268 TheCondState.CondMet = ExpectEqual == (String1 == String2); 5269 TheCondState.Ignore = !TheCondState.CondMet; 5270 5271 return false; 5272 } 5273 5274 /// parseDirectiveIfdef 5275 /// ::= .ifdef symbol 5276 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) { 5277 StringRef Name; 5278 TheCondStack.push_back(TheCondState); 5279 TheCondState.TheCond = AsmCond::IfCond; 5280 5281 if (TheCondState.Ignore) { 5282 eatToEndOfStatement(); 5283 } else { 5284 if (check(parseIdentifier(Name), "expected identifier after '.ifdef'") || 5285 parseEOL()) 5286 return true; 5287 5288 MCSymbol *Sym = getContext().lookupSymbol(Name); 5289 5290 if (expect_defined) 5291 TheCondState.CondMet = (Sym && !Sym->isUndefined(false)); 5292 else 5293 TheCondState.CondMet = (!Sym || Sym->isUndefined(false)); 5294 TheCondState.Ignore = !TheCondState.CondMet; 5295 } 5296 5297 return false; 5298 } 5299 5300 /// parseDirectiveElseIf 5301 /// ::= .elseif expression 5302 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) { 5303 if (TheCondState.TheCond != AsmCond::IfCond && 5304 TheCondState.TheCond != AsmCond::ElseIfCond) 5305 return Error(DirectiveLoc, "Encountered a .elseif that doesn't follow an" 5306 " .if or an .elseif"); 5307 TheCondState.TheCond = AsmCond::ElseIfCond; 5308 5309 bool LastIgnoreState = false; 5310 if (!TheCondStack.empty()) 5311 LastIgnoreState = TheCondStack.back().Ignore; 5312 if (LastIgnoreState || TheCondState.CondMet) { 5313 TheCondState.Ignore = true; 5314 eatToEndOfStatement(); 5315 } else { 5316 int64_t ExprValue; 5317 if (parseAbsoluteExpression(ExprValue)) 5318 return true; 5319 5320 if (parseEOL()) 5321 return true; 5322 5323 TheCondState.CondMet = ExprValue; 5324 TheCondState.Ignore = !TheCondState.CondMet; 5325 } 5326 5327 return false; 5328 } 5329 5330 /// parseDirectiveElse 5331 /// ::= .else 5332 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) { 5333 if (parseEOL()) 5334 return true; 5335 5336 if (TheCondState.TheCond != AsmCond::IfCond && 5337 TheCondState.TheCond != AsmCond::ElseIfCond) 5338 return Error(DirectiveLoc, "Encountered a .else that doesn't follow " 5339 " an .if or an .elseif"); 5340 TheCondState.TheCond = AsmCond::ElseCond; 5341 bool LastIgnoreState = false; 5342 if (!TheCondStack.empty()) 5343 LastIgnoreState = TheCondStack.back().Ignore; 5344 if (LastIgnoreState || TheCondState.CondMet) 5345 TheCondState.Ignore = true; 5346 else 5347 TheCondState.Ignore = false; 5348 5349 return false; 5350 } 5351 5352 /// parseDirectiveEnd 5353 /// ::= .end 5354 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) { 5355 if (parseEOL()) 5356 return true; 5357 5358 while (Lexer.isNot(AsmToken::Eof)) 5359 Lexer.Lex(); 5360 5361 return false; 5362 } 5363 5364 /// parseDirectiveError 5365 /// ::= .err 5366 /// ::= .error [string] 5367 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) { 5368 if (!TheCondStack.empty()) { 5369 if (TheCondStack.back().Ignore) { 5370 eatToEndOfStatement(); 5371 return false; 5372 } 5373 } 5374 5375 if (!WithMessage) 5376 return Error(L, ".err encountered"); 5377 5378 StringRef Message = ".error directive invoked in source file"; 5379 if (Lexer.isNot(AsmToken::EndOfStatement)) { 5380 if (Lexer.isNot(AsmToken::String)) 5381 return TokError(".error argument must be a string"); 5382 5383 Message = getTok().getStringContents(); 5384 Lex(); 5385 } 5386 5387 return Error(L, Message); 5388 } 5389 5390 /// parseDirectiveWarning 5391 /// ::= .warning [string] 5392 bool AsmParser::parseDirectiveWarning(SMLoc L) { 5393 if (!TheCondStack.empty()) { 5394 if (TheCondStack.back().Ignore) { 5395 eatToEndOfStatement(); 5396 return false; 5397 } 5398 } 5399 5400 StringRef Message = ".warning directive invoked in source file"; 5401 5402 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 5403 if (Lexer.isNot(AsmToken::String)) 5404 return TokError(".warning argument must be a string"); 5405 5406 Message = getTok().getStringContents(); 5407 Lex(); 5408 if (parseEOL()) 5409 return true; 5410 } 5411 5412 return Warning(L, Message); 5413 } 5414 5415 /// parseDirectiveEndIf 5416 /// ::= .endif 5417 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) { 5418 if (parseEOL()) 5419 return true; 5420 5421 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty()) 5422 return Error(DirectiveLoc, "Encountered a .endif that doesn't follow " 5423 "an .if or .else"); 5424 if (!TheCondStack.empty()) { 5425 TheCondState = TheCondStack.back(); 5426 TheCondStack.pop_back(); 5427 } 5428 5429 return false; 5430 } 5431 5432 void AsmParser::initializeDirectiveKindMap() { 5433 /* Lookup will be done with the directive 5434 * converted to lower case, so all these 5435 * keys should be lower case. 5436 * (target specific directives are handled 5437 * elsewhere) 5438 */ 5439 DirectiveKindMap[".set"] = DK_SET; 5440 DirectiveKindMap[".equ"] = DK_EQU; 5441 DirectiveKindMap[".equiv"] = DK_EQUIV; 5442 DirectiveKindMap[".ascii"] = DK_ASCII; 5443 DirectiveKindMap[".asciz"] = DK_ASCIZ; 5444 DirectiveKindMap[".string"] = DK_STRING; 5445 DirectiveKindMap[".byte"] = DK_BYTE; 5446 DirectiveKindMap[".short"] = DK_SHORT; 5447 DirectiveKindMap[".value"] = DK_VALUE; 5448 DirectiveKindMap[".2byte"] = DK_2BYTE; 5449 DirectiveKindMap[".long"] = DK_LONG; 5450 DirectiveKindMap[".int"] = DK_INT; 5451 DirectiveKindMap[".4byte"] = DK_4BYTE; 5452 DirectiveKindMap[".quad"] = DK_QUAD; 5453 DirectiveKindMap[".8byte"] = DK_8BYTE; 5454 DirectiveKindMap[".octa"] = DK_OCTA; 5455 DirectiveKindMap[".single"] = DK_SINGLE; 5456 DirectiveKindMap[".float"] = DK_FLOAT; 5457 DirectiveKindMap[".double"] = DK_DOUBLE; 5458 DirectiveKindMap[".align"] = DK_ALIGN; 5459 DirectiveKindMap[".align32"] = DK_ALIGN32; 5460 DirectiveKindMap[".balign"] = DK_BALIGN; 5461 DirectiveKindMap[".balignw"] = DK_BALIGNW; 5462 DirectiveKindMap[".balignl"] = DK_BALIGNL; 5463 DirectiveKindMap[".p2align"] = DK_P2ALIGN; 5464 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW; 5465 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL; 5466 DirectiveKindMap[".org"] = DK_ORG; 5467 DirectiveKindMap[".fill"] = DK_FILL; 5468 DirectiveKindMap[".zero"] = DK_ZERO; 5469 DirectiveKindMap[".extern"] = DK_EXTERN; 5470 DirectiveKindMap[".globl"] = DK_GLOBL; 5471 DirectiveKindMap[".global"] = DK_GLOBAL; 5472 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE; 5473 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP; 5474 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER; 5475 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN; 5476 DirectiveKindMap[".reference"] = DK_REFERENCE; 5477 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION; 5478 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE; 5479 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN; 5480 DirectiveKindMap[".cold"] = DK_COLD; 5481 DirectiveKindMap[".comm"] = DK_COMM; 5482 DirectiveKindMap[".common"] = DK_COMMON; 5483 DirectiveKindMap[".lcomm"] = DK_LCOMM; 5484 DirectiveKindMap[".abort"] = DK_ABORT; 5485 DirectiveKindMap[".include"] = DK_INCLUDE; 5486 DirectiveKindMap[".incbin"] = DK_INCBIN; 5487 DirectiveKindMap[".code16"] = DK_CODE16; 5488 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC; 5489 DirectiveKindMap[".rept"] = DK_REPT; 5490 DirectiveKindMap[".rep"] = DK_REPT; 5491 DirectiveKindMap[".irp"] = DK_IRP; 5492 DirectiveKindMap[".irpc"] = DK_IRPC; 5493 DirectiveKindMap[".endr"] = DK_ENDR; 5494 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE; 5495 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK; 5496 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK; 5497 DirectiveKindMap[".if"] = DK_IF; 5498 DirectiveKindMap[".ifeq"] = DK_IFEQ; 5499 DirectiveKindMap[".ifge"] = DK_IFGE; 5500 DirectiveKindMap[".ifgt"] = DK_IFGT; 5501 DirectiveKindMap[".ifle"] = DK_IFLE; 5502 DirectiveKindMap[".iflt"] = DK_IFLT; 5503 DirectiveKindMap[".ifne"] = DK_IFNE; 5504 DirectiveKindMap[".ifb"] = DK_IFB; 5505 DirectiveKindMap[".ifnb"] = DK_IFNB; 5506 DirectiveKindMap[".ifc"] = DK_IFC; 5507 DirectiveKindMap[".ifeqs"] = DK_IFEQS; 5508 DirectiveKindMap[".ifnc"] = DK_IFNC; 5509 DirectiveKindMap[".ifnes"] = DK_IFNES; 5510 DirectiveKindMap[".ifdef"] = DK_IFDEF; 5511 DirectiveKindMap[".ifndef"] = DK_IFNDEF; 5512 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF; 5513 DirectiveKindMap[".elseif"] = DK_ELSEIF; 5514 DirectiveKindMap[".else"] = DK_ELSE; 5515 DirectiveKindMap[".end"] = DK_END; 5516 DirectiveKindMap[".endif"] = DK_ENDIF; 5517 DirectiveKindMap[".skip"] = DK_SKIP; 5518 DirectiveKindMap[".space"] = DK_SPACE; 5519 DirectiveKindMap[".file"] = DK_FILE; 5520 DirectiveKindMap[".line"] = DK_LINE; 5521 DirectiveKindMap[".loc"] = DK_LOC; 5522 DirectiveKindMap[".stabs"] = DK_STABS; 5523 DirectiveKindMap[".cv_file"] = DK_CV_FILE; 5524 DirectiveKindMap[".cv_func_id"] = DK_CV_FUNC_ID; 5525 DirectiveKindMap[".cv_loc"] = DK_CV_LOC; 5526 DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE; 5527 DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE; 5528 DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID; 5529 DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE; 5530 DirectiveKindMap[".cv_string"] = DK_CV_STRING; 5531 DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE; 5532 DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS; 5533 DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET; 5534 DirectiveKindMap[".cv_fpo_data"] = DK_CV_FPO_DATA; 5535 DirectiveKindMap[".sleb128"] = DK_SLEB128; 5536 DirectiveKindMap[".uleb128"] = DK_ULEB128; 5537 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS; 5538 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC; 5539 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC; 5540 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA; 5541 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET; 5542 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET; 5543 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER; 5544 DirectiveKindMap[".cfi_llvm_def_aspace_cfa"] = DK_CFI_LLVM_DEF_ASPACE_CFA; 5545 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET; 5546 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET; 5547 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY; 5548 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA; 5549 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE; 5550 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE; 5551 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE; 5552 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE; 5553 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE; 5554 DirectiveKindMap[".cfi_return_column"] = DK_CFI_RETURN_COLUMN; 5555 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME; 5556 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED; 5557 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER; 5558 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE; 5559 DirectiveKindMap[".cfi_b_key_frame"] = DK_CFI_B_KEY_FRAME; 5560 DirectiveKindMap[".cfi_mte_tagged_frame"] = DK_CFI_MTE_TAGGED_FRAME; 5561 DirectiveKindMap[".macros_on"] = DK_MACROS_ON; 5562 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF; 5563 DirectiveKindMap[".macro"] = DK_MACRO; 5564 DirectiveKindMap[".exitm"] = DK_EXITM; 5565 DirectiveKindMap[".endm"] = DK_ENDM; 5566 DirectiveKindMap[".endmacro"] = DK_ENDMACRO; 5567 DirectiveKindMap[".purgem"] = DK_PURGEM; 5568 DirectiveKindMap[".err"] = DK_ERR; 5569 DirectiveKindMap[".error"] = DK_ERROR; 5570 DirectiveKindMap[".warning"] = DK_WARNING; 5571 DirectiveKindMap[".altmacro"] = DK_ALTMACRO; 5572 DirectiveKindMap[".noaltmacro"] = DK_NOALTMACRO; 5573 DirectiveKindMap[".reloc"] = DK_RELOC; 5574 DirectiveKindMap[".dc"] = DK_DC; 5575 DirectiveKindMap[".dc.a"] = DK_DC_A; 5576 DirectiveKindMap[".dc.b"] = DK_DC_B; 5577 DirectiveKindMap[".dc.d"] = DK_DC_D; 5578 DirectiveKindMap[".dc.l"] = DK_DC_L; 5579 DirectiveKindMap[".dc.s"] = DK_DC_S; 5580 DirectiveKindMap[".dc.w"] = DK_DC_W; 5581 DirectiveKindMap[".dc.x"] = DK_DC_X; 5582 DirectiveKindMap[".dcb"] = DK_DCB; 5583 DirectiveKindMap[".dcb.b"] = DK_DCB_B; 5584 DirectiveKindMap[".dcb.d"] = DK_DCB_D; 5585 DirectiveKindMap[".dcb.l"] = DK_DCB_L; 5586 DirectiveKindMap[".dcb.s"] = DK_DCB_S; 5587 DirectiveKindMap[".dcb.w"] = DK_DCB_W; 5588 DirectiveKindMap[".dcb.x"] = DK_DCB_X; 5589 DirectiveKindMap[".ds"] = DK_DS; 5590 DirectiveKindMap[".ds.b"] = DK_DS_B; 5591 DirectiveKindMap[".ds.d"] = DK_DS_D; 5592 DirectiveKindMap[".ds.l"] = DK_DS_L; 5593 DirectiveKindMap[".ds.p"] = DK_DS_P; 5594 DirectiveKindMap[".ds.s"] = DK_DS_S; 5595 DirectiveKindMap[".ds.w"] = DK_DS_W; 5596 DirectiveKindMap[".ds.x"] = DK_DS_X; 5597 DirectiveKindMap[".print"] = DK_PRINT; 5598 DirectiveKindMap[".addrsig"] = DK_ADDRSIG; 5599 DirectiveKindMap[".addrsig_sym"] = DK_ADDRSIG_SYM; 5600 DirectiveKindMap[".pseudoprobe"] = DK_PSEUDO_PROBE; 5601 DirectiveKindMap[".lto_discard"] = DK_LTO_DISCARD; 5602 DirectiveKindMap[".lto_set_conditional"] = DK_LTO_SET_CONDITIONAL; 5603 } 5604 5605 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) { 5606 AsmToken EndToken, StartToken = getTok(); 5607 5608 unsigned NestLevel = 0; 5609 while (true) { 5610 // Check whether we have reached the end of the file. 5611 if (getLexer().is(AsmToken::Eof)) { 5612 printError(DirectiveLoc, "no matching '.endr' in definition"); 5613 return nullptr; 5614 } 5615 5616 if (Lexer.is(AsmToken::Identifier) && 5617 (getTok().getIdentifier() == ".rep" || 5618 getTok().getIdentifier() == ".rept" || 5619 getTok().getIdentifier() == ".irp" || 5620 getTok().getIdentifier() == ".irpc")) { 5621 ++NestLevel; 5622 } 5623 5624 // Otherwise, check whether we have reached the .endr. 5625 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") { 5626 if (NestLevel == 0) { 5627 EndToken = getTok(); 5628 Lex(); 5629 if (Lexer.isNot(AsmToken::EndOfStatement)) { 5630 printError(getTok().getLoc(), 5631 "unexpected token in '.endr' directive"); 5632 return nullptr; 5633 } 5634 break; 5635 } 5636 --NestLevel; 5637 } 5638 5639 // Otherwise, scan till the end of the statement. 5640 eatToEndOfStatement(); 5641 } 5642 5643 const char *BodyStart = StartToken.getLoc().getPointer(); 5644 const char *BodyEnd = EndToken.getLoc().getPointer(); 5645 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 5646 5647 // We Are Anonymous. 5648 MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters()); 5649 return &MacroLikeBodies.back(); 5650 } 5651 5652 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 5653 raw_svector_ostream &OS) { 5654 OS << ".endr\n"; 5655 5656 std::unique_ptr<MemoryBuffer> Instantiation = 5657 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 5658 5659 // Create the macro instantiation object and add to the current macro 5660 // instantiation stack. 5661 MacroInstantiation *MI = new MacroInstantiation{ 5662 DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()}; 5663 ActiveMacros.push_back(MI); 5664 5665 // Jump to the macro instantiation and prime the lexer. 5666 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 5667 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 5668 Lex(); 5669 } 5670 5671 /// parseDirectiveRept 5672 /// ::= .rep | .rept count 5673 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) { 5674 const MCExpr *CountExpr; 5675 SMLoc CountLoc = getTok().getLoc(); 5676 if (parseExpression(CountExpr)) 5677 return true; 5678 5679 int64_t Count; 5680 if (!CountExpr->evaluateAsAbsolute(Count, getStreamer().getAssemblerPtr())) { 5681 return Error(CountLoc, "unexpected token in '" + Dir + "' directive"); 5682 } 5683 5684 if (check(Count < 0, CountLoc, "Count is negative") || parseEOL()) 5685 return true; 5686 5687 // Lex the rept definition. 5688 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5689 if (!M) 5690 return true; 5691 5692 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5693 // to hold the macro body with substitutions. 5694 SmallString<256> Buf; 5695 raw_svector_ostream OS(Buf); 5696 while (Count--) { 5697 // Note that the AtPseudoVariable is disabled for instantiations of .rep(t). 5698 if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc())) 5699 return true; 5700 } 5701 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5702 5703 return false; 5704 } 5705 5706 /// parseDirectiveIrp 5707 /// ::= .irp symbol,values 5708 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) { 5709 MCAsmMacroParameter Parameter; 5710 MCAsmMacroArguments A; 5711 if (check(parseIdentifier(Parameter.Name), 5712 "expected identifier in '.irp' directive") || 5713 parseComma() || parseMacroArguments(nullptr, A) || parseEOL()) 5714 return true; 5715 5716 // Lex the irp definition. 5717 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5718 if (!M) 5719 return true; 5720 5721 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5722 // to hold the macro body with substitutions. 5723 SmallString<256> Buf; 5724 raw_svector_ostream OS(Buf); 5725 5726 for (const MCAsmMacroArgument &Arg : A) { 5727 // Note that the AtPseudoVariable is enabled for instantiations of .irp. 5728 // This is undocumented, but GAS seems to support it. 5729 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) 5730 return true; 5731 } 5732 5733 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5734 5735 return false; 5736 } 5737 5738 /// parseDirectiveIrpc 5739 /// ::= .irpc symbol,values 5740 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) { 5741 MCAsmMacroParameter Parameter; 5742 MCAsmMacroArguments A; 5743 5744 if (check(parseIdentifier(Parameter.Name), 5745 "expected identifier in '.irpc' directive") || 5746 parseComma() || parseMacroArguments(nullptr, A)) 5747 return true; 5748 5749 if (A.size() != 1 || A.front().size() != 1) 5750 return TokError("unexpected token in '.irpc' directive"); 5751 if (parseEOL()) 5752 return true; 5753 5754 // Lex the irpc definition. 5755 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5756 if (!M) 5757 return true; 5758 5759 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5760 // to hold the macro body with substitutions. 5761 SmallString<256> Buf; 5762 raw_svector_ostream OS(Buf); 5763 5764 StringRef Values = A.front().front().getString(); 5765 for (std::size_t I = 0, End = Values.size(); I != End; ++I) { 5766 MCAsmMacroArgument Arg; 5767 Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1)); 5768 5769 // Note that the AtPseudoVariable is enabled for instantiations of .irpc. 5770 // This is undocumented, but GAS seems to support it. 5771 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) 5772 return true; 5773 } 5774 5775 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5776 5777 return false; 5778 } 5779 5780 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) { 5781 if (ActiveMacros.empty()) 5782 return TokError("unmatched '.endr' directive"); 5783 5784 // The only .repl that should get here are the ones created by 5785 // instantiateMacroLikeBody. 5786 assert(getLexer().is(AsmToken::EndOfStatement)); 5787 5788 handleMacroExit(); 5789 return false; 5790 } 5791 5792 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info, 5793 size_t Len) { 5794 const MCExpr *Value; 5795 SMLoc ExprLoc = getLexer().getLoc(); 5796 if (parseExpression(Value)) 5797 return true; 5798 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5799 if (!MCE) 5800 return Error(ExprLoc, "unexpected expression in _emit"); 5801 uint64_t IntValue = MCE->getValue(); 5802 if (!isUInt<8>(IntValue) && !isInt<8>(IntValue)) 5803 return Error(ExprLoc, "literal value out of range for directive"); 5804 5805 Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len); 5806 return false; 5807 } 5808 5809 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) { 5810 const MCExpr *Value; 5811 SMLoc ExprLoc = getLexer().getLoc(); 5812 if (parseExpression(Value)) 5813 return true; 5814 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5815 if (!MCE) 5816 return Error(ExprLoc, "unexpected expression in align"); 5817 uint64_t IntValue = MCE->getValue(); 5818 if (!isPowerOf2_64(IntValue)) 5819 return Error(ExprLoc, "literal value not a power of two greater then zero"); 5820 5821 Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue)); 5822 return false; 5823 } 5824 5825 bool AsmParser::parseDirectivePrint(SMLoc DirectiveLoc) { 5826 const AsmToken StrTok = getTok(); 5827 Lex(); 5828 if (StrTok.isNot(AsmToken::String) || StrTok.getString().front() != '"') 5829 return Error(DirectiveLoc, "expected double quoted string after .print"); 5830 if (parseEOL()) 5831 return true; 5832 llvm::outs() << StrTok.getStringContents() << '\n'; 5833 return false; 5834 } 5835 5836 bool AsmParser::parseDirectiveAddrsig() { 5837 if (parseEOL()) 5838 return true; 5839 getStreamer().emitAddrsig(); 5840 return false; 5841 } 5842 5843 bool AsmParser::parseDirectiveAddrsigSym() { 5844 StringRef Name; 5845 if (check(parseIdentifier(Name), "expected identifier") || parseEOL()) 5846 return true; 5847 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 5848 getStreamer().emitAddrsigSym(Sym); 5849 return false; 5850 } 5851 5852 bool AsmParser::parseDirectivePseudoProbe() { 5853 int64_t Guid; 5854 int64_t Index; 5855 int64_t Type; 5856 int64_t Attr; 5857 5858 if (getLexer().is(AsmToken::Integer)) { 5859 if (parseIntToken(Guid, "unexpected token in '.pseudoprobe' directive")) 5860 return true; 5861 } 5862 5863 if (getLexer().is(AsmToken::Integer)) { 5864 if (parseIntToken(Index, "unexpected token in '.pseudoprobe' directive")) 5865 return true; 5866 } 5867 5868 if (getLexer().is(AsmToken::Integer)) { 5869 if (parseIntToken(Type, "unexpected token in '.pseudoprobe' directive")) 5870 return true; 5871 } 5872 5873 if (getLexer().is(AsmToken::Integer)) { 5874 if (parseIntToken(Attr, "unexpected token in '.pseudoprobe' directive")) 5875 return true; 5876 } 5877 5878 // Parse inline stack like @ GUID:11:12 @ GUID:1:11 @ GUID:3:21 5879 MCPseudoProbeInlineStack InlineStack; 5880 5881 while (getLexer().is(AsmToken::At)) { 5882 // eat @ 5883 Lex(); 5884 5885 int64_t CallerGuid = 0; 5886 if (getLexer().is(AsmToken::Integer)) { 5887 if (parseIntToken(CallerGuid, 5888 "unexpected token in '.pseudoprobe' directive")) 5889 return true; 5890 } 5891 5892 // eat colon 5893 if (getLexer().is(AsmToken::Colon)) 5894 Lex(); 5895 5896 int64_t CallerProbeId = 0; 5897 if (getLexer().is(AsmToken::Integer)) { 5898 if (parseIntToken(CallerProbeId, 5899 "unexpected token in '.pseudoprobe' directive")) 5900 return true; 5901 } 5902 5903 InlineSite Site(CallerGuid, CallerProbeId); 5904 InlineStack.push_back(Site); 5905 } 5906 5907 if (parseEOL()) 5908 return true; 5909 5910 getStreamer().emitPseudoProbe(Guid, Index, Type, Attr, InlineStack); 5911 return false; 5912 } 5913 5914 /// parseDirectiveLTODiscard 5915 /// ::= ".lto_discard" [ identifier ( , identifier )* ] 5916 /// The LTO library emits this directive to discard non-prevailing symbols. 5917 /// We ignore symbol assignments and attribute changes for the specified 5918 /// symbols. 5919 bool AsmParser::parseDirectiveLTODiscard() { 5920 auto ParseOp = [&]() -> bool { 5921 StringRef Name; 5922 SMLoc Loc = getTok().getLoc(); 5923 if (parseIdentifier(Name)) 5924 return Error(Loc, "expected identifier"); 5925 LTODiscardSymbols.insert(Name); 5926 return false; 5927 }; 5928 5929 LTODiscardSymbols.clear(); 5930 return parseMany(ParseOp); 5931 } 5932 5933 // We are comparing pointers, but the pointers are relative to a single string. 5934 // Thus, this should always be deterministic. 5935 static int rewritesSort(const AsmRewrite *AsmRewriteA, 5936 const AsmRewrite *AsmRewriteB) { 5937 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer()) 5938 return -1; 5939 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer()) 5940 return 1; 5941 5942 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output 5943 // rewrite to the same location. Make sure the SizeDirective rewrite is 5944 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This 5945 // ensures the sort algorithm is stable. 5946 if (AsmRewritePrecedence[AsmRewriteA->Kind] > 5947 AsmRewritePrecedence[AsmRewriteB->Kind]) 5948 return -1; 5949 5950 if (AsmRewritePrecedence[AsmRewriteA->Kind] < 5951 AsmRewritePrecedence[AsmRewriteB->Kind]) 5952 return 1; 5953 llvm_unreachable("Unstable rewrite sort."); 5954 } 5955 5956 bool AsmParser::parseMSInlineAsm( 5957 std::string &AsmString, unsigned &NumOutputs, unsigned &NumInputs, 5958 SmallVectorImpl<std::pair<void *, bool>> &OpDecls, 5959 SmallVectorImpl<std::string> &Constraints, 5960 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII, 5961 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) { 5962 SmallVector<void *, 4> InputDecls; 5963 SmallVector<void *, 4> OutputDecls; 5964 SmallVector<bool, 4> InputDeclsAddressOf; 5965 SmallVector<bool, 4> OutputDeclsAddressOf; 5966 SmallVector<std::string, 4> InputConstraints; 5967 SmallVector<std::string, 4> OutputConstraints; 5968 SmallVector<unsigned, 4> ClobberRegs; 5969 5970 SmallVector<AsmRewrite, 4> AsmStrRewrites; 5971 5972 // Prime the lexer. 5973 Lex(); 5974 5975 // While we have input, parse each statement. 5976 unsigned InputIdx = 0; 5977 unsigned OutputIdx = 0; 5978 while (getLexer().isNot(AsmToken::Eof)) { 5979 // Parse curly braces marking block start/end 5980 if (parseCurlyBlockScope(AsmStrRewrites)) 5981 continue; 5982 5983 ParseStatementInfo Info(&AsmStrRewrites); 5984 bool StatementErr = parseStatement(Info, &SI); 5985 5986 if (StatementErr || Info.ParseError) { 5987 // Emit pending errors if any exist. 5988 printPendingErrors(); 5989 return true; 5990 } 5991 5992 // No pending error should exist here. 5993 assert(!hasPendingError() && "unexpected error from parseStatement"); 5994 5995 if (Info.Opcode == ~0U) 5996 continue; 5997 5998 const MCInstrDesc &Desc = MII->get(Info.Opcode); 5999 6000 // Build the list of clobbers, outputs and inputs. 6001 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) { 6002 MCParsedAsmOperand &Operand = *Info.ParsedOperands[i]; 6003 6004 // Register operand. 6005 if (Operand.isReg() && !Operand.needAddressOf() && 6006 !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) { 6007 unsigned NumDefs = Desc.getNumDefs(); 6008 // Clobber. 6009 if (NumDefs && Operand.getMCOperandNum() < NumDefs) 6010 ClobberRegs.push_back(Operand.getReg()); 6011 continue; 6012 } 6013 6014 // Expr/Input or Output. 6015 StringRef SymName = Operand.getSymName(); 6016 if (SymName.empty()) 6017 continue; 6018 6019 void *OpDecl = Operand.getOpDecl(); 6020 if (!OpDecl) 6021 continue; 6022 6023 StringRef Constraint = Operand.getConstraint(); 6024 if (Operand.isImm()) { 6025 // Offset as immediate 6026 if (Operand.isOffsetOfLocal()) 6027 Constraint = "r"; 6028 else 6029 Constraint = "i"; 6030 } 6031 6032 bool isOutput = (i == 1) && Desc.mayStore(); 6033 bool Restricted = Operand.isMemUseUpRegs(); 6034 SMLoc Start = SMLoc::getFromPointer(SymName.data()); 6035 if (isOutput) { 6036 ++InputIdx; 6037 OutputDecls.push_back(OpDecl); 6038 OutputDeclsAddressOf.push_back(Operand.needAddressOf()); 6039 OutputConstraints.push_back(("=" + Constraint).str()); 6040 AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size(), 0, 6041 Restricted); 6042 } else { 6043 InputDecls.push_back(OpDecl); 6044 InputDeclsAddressOf.push_back(Operand.needAddressOf()); 6045 InputConstraints.push_back(Constraint.str()); 6046 if (Desc.OpInfo[i - 1].isBranchTarget()) 6047 AsmStrRewrites.emplace_back(AOK_CallInput, Start, SymName.size(), 0, 6048 Restricted); 6049 else 6050 AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size(), 0, 6051 Restricted); 6052 } 6053 } 6054 6055 // Consider implicit defs to be clobbers. Think of cpuid and push. 6056 ArrayRef<MCPhysReg> ImpDefs(Desc.getImplicitDefs(), 6057 Desc.getNumImplicitDefs()); 6058 llvm::append_range(ClobberRegs, ImpDefs); 6059 } 6060 6061 // Set the number of Outputs and Inputs. 6062 NumOutputs = OutputDecls.size(); 6063 NumInputs = InputDecls.size(); 6064 6065 // Set the unique clobbers. 6066 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end()); 6067 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()), 6068 ClobberRegs.end()); 6069 Clobbers.assign(ClobberRegs.size(), std::string()); 6070 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) { 6071 raw_string_ostream OS(Clobbers[I]); 6072 IP->printRegName(OS, ClobberRegs[I]); 6073 } 6074 6075 // Merge the various outputs and inputs. Output are expected first. 6076 if (NumOutputs || NumInputs) { 6077 unsigned NumExprs = NumOutputs + NumInputs; 6078 OpDecls.resize(NumExprs); 6079 Constraints.resize(NumExprs); 6080 for (unsigned i = 0; i < NumOutputs; ++i) { 6081 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]); 6082 Constraints[i] = OutputConstraints[i]; 6083 } 6084 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) { 6085 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]); 6086 Constraints[j] = InputConstraints[i]; 6087 } 6088 } 6089 6090 // Build the IR assembly string. 6091 std::string AsmStringIR; 6092 raw_string_ostream OS(AsmStringIR); 6093 StringRef ASMString = 6094 SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer(); 6095 const char *AsmStart = ASMString.begin(); 6096 const char *AsmEnd = ASMString.end(); 6097 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort); 6098 for (auto it = AsmStrRewrites.begin(); it != AsmStrRewrites.end(); ++it) { 6099 const AsmRewrite &AR = *it; 6100 // Check if this has already been covered by another rewrite... 6101 if (AR.Done) 6102 continue; 6103 AsmRewriteKind Kind = AR.Kind; 6104 6105 const char *Loc = AR.Loc.getPointer(); 6106 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!"); 6107 6108 // Emit everything up to the immediate/expression. 6109 if (unsigned Len = Loc - AsmStart) 6110 OS << StringRef(AsmStart, Len); 6111 6112 // Skip the original expression. 6113 if (Kind == AOK_Skip) { 6114 AsmStart = Loc + AR.Len; 6115 continue; 6116 } 6117 6118 unsigned AdditionalSkip = 0; 6119 // Rewrite expressions in $N notation. 6120 switch (Kind) { 6121 default: 6122 break; 6123 case AOK_IntelExpr: 6124 assert(AR.IntelExp.isValid() && "cannot write invalid intel expression"); 6125 if (AR.IntelExp.NeedBracs) 6126 OS << "["; 6127 if (AR.IntelExp.hasBaseReg()) 6128 OS << AR.IntelExp.BaseReg; 6129 if (AR.IntelExp.hasIndexReg()) 6130 OS << (AR.IntelExp.hasBaseReg() ? " + " : "") 6131 << AR.IntelExp.IndexReg; 6132 if (AR.IntelExp.Scale > 1) 6133 OS << " * $$" << AR.IntelExp.Scale; 6134 if (AR.IntelExp.hasOffset()) { 6135 if (AR.IntelExp.hasRegs()) 6136 OS << " + "; 6137 // Fuse this rewrite with a rewrite of the offset name, if present. 6138 StringRef OffsetName = AR.IntelExp.OffsetName; 6139 SMLoc OffsetLoc = SMLoc::getFromPointer(AR.IntelExp.OffsetName.data()); 6140 size_t OffsetLen = OffsetName.size(); 6141 auto rewrite_it = std::find_if( 6142 it, AsmStrRewrites.end(), [&](const AsmRewrite &FusingAR) { 6143 return FusingAR.Loc == OffsetLoc && FusingAR.Len == OffsetLen && 6144 (FusingAR.Kind == AOK_Input || 6145 FusingAR.Kind == AOK_CallInput); 6146 }); 6147 if (rewrite_it == AsmStrRewrites.end()) { 6148 OS << "offset " << OffsetName; 6149 } else if (rewrite_it->Kind == AOK_CallInput) { 6150 OS << "${" << InputIdx++ << ":P}"; 6151 rewrite_it->Done = true; 6152 } else { 6153 OS << '$' << InputIdx++; 6154 rewrite_it->Done = true; 6155 } 6156 } 6157 if (AR.IntelExp.Imm || AR.IntelExp.emitImm()) 6158 OS << (AR.IntelExp.emitImm() ? "$$" : " + $$") << AR.IntelExp.Imm; 6159 if (AR.IntelExp.NeedBracs) 6160 OS << "]"; 6161 break; 6162 case AOK_Label: 6163 OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label; 6164 break; 6165 case AOK_Input: 6166 if (AR.IntelExpRestricted) 6167 OS << "${" << InputIdx++ << ":P}"; 6168 else 6169 OS << '$' << InputIdx++; 6170 break; 6171 case AOK_CallInput: 6172 OS << "${" << InputIdx++ << ":P}"; 6173 break; 6174 case AOK_Output: 6175 if (AR.IntelExpRestricted) 6176 OS << "${" << OutputIdx++ << ":P}"; 6177 else 6178 OS << '$' << OutputIdx++; 6179 break; 6180 case AOK_SizeDirective: 6181 switch (AR.Val) { 6182 default: break; 6183 case 8: OS << "byte ptr "; break; 6184 case 16: OS << "word ptr "; break; 6185 case 32: OS << "dword ptr "; break; 6186 case 64: OS << "qword ptr "; break; 6187 case 80: OS << "xword ptr "; break; 6188 case 128: OS << "xmmword ptr "; break; 6189 case 256: OS << "ymmword ptr "; break; 6190 } 6191 break; 6192 case AOK_Emit: 6193 OS << ".byte"; 6194 break; 6195 case AOK_Align: { 6196 // MS alignment directives are measured in bytes. If the native assembler 6197 // measures alignment in bytes, we can pass it straight through. 6198 OS << ".align"; 6199 if (getContext().getAsmInfo()->getAlignmentIsInBytes()) 6200 break; 6201 6202 // Alignment is in log2 form, so print that instead and skip the original 6203 // immediate. 6204 unsigned Val = AR.Val; 6205 OS << ' ' << Val; 6206 assert(Val < 10 && "Expected alignment less then 2^10."); 6207 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4; 6208 break; 6209 } 6210 case AOK_EVEN: 6211 OS << ".even"; 6212 break; 6213 case AOK_EndOfStatement: 6214 OS << "\n\t"; 6215 break; 6216 } 6217 6218 // Skip the original expression. 6219 AsmStart = Loc + AR.Len + AdditionalSkip; 6220 } 6221 6222 // Emit the remainder of the asm string. 6223 if (AsmStart != AsmEnd) 6224 OS << StringRef(AsmStart, AsmEnd - AsmStart); 6225 6226 AsmString = OS.str(); 6227 return false; 6228 } 6229 6230 bool HLASMAsmParser::parseAsHLASMLabel(ParseStatementInfo &Info, 6231 MCAsmParserSemaCallback *SI) { 6232 AsmToken LabelTok = getTok(); 6233 SMLoc LabelLoc = LabelTok.getLoc(); 6234 StringRef LabelVal; 6235 6236 if (parseIdentifier(LabelVal)) 6237 return Error(LabelLoc, "The HLASM Label has to be an Identifier"); 6238 6239 // We have validated whether the token is an Identifier. 6240 // Now we have to validate whether the token is a 6241 // valid HLASM Label. 6242 if (!getTargetParser().isLabel(LabelTok) || checkForValidSection()) 6243 return true; 6244 6245 // Lex leading spaces to get to the next operand. 6246 lexLeadingSpaces(); 6247 6248 // We shouldn't emit the label if there is nothing else after the label. 6249 // i.e asm("<token>\n") 6250 if (getTok().is(AsmToken::EndOfStatement)) 6251 return Error(LabelLoc, 6252 "Cannot have just a label for an HLASM inline asm statement"); 6253 6254 MCSymbol *Sym = getContext().getOrCreateSymbol( 6255 getContext().getAsmInfo()->shouldEmitLabelsInUpperCase() 6256 ? LabelVal.upper() 6257 : LabelVal); 6258 6259 getTargetParser().doBeforeLabelEmit(Sym); 6260 6261 // Emit the label. 6262 Out.emitLabel(Sym, LabelLoc); 6263 6264 // If we are generating dwarf for assembly source files then gather the 6265 // info to make a dwarf label entry for this label if needed. 6266 if (enabledGenDwarfForAssembly()) 6267 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), 6268 LabelLoc); 6269 6270 getTargetParser().onLabelParsed(Sym); 6271 6272 return false; 6273 } 6274 6275 bool HLASMAsmParser::parseAsMachineInstruction(ParseStatementInfo &Info, 6276 MCAsmParserSemaCallback *SI) { 6277 AsmToken OperationEntryTok = Lexer.getTok(); 6278 SMLoc OperationEntryLoc = OperationEntryTok.getLoc(); 6279 StringRef OperationEntryVal; 6280 6281 // Attempt to parse the first token as an Identifier 6282 if (parseIdentifier(OperationEntryVal)) 6283 return Error(OperationEntryLoc, "unexpected token at start of statement"); 6284 6285 // Once we've parsed the operation entry successfully, lex 6286 // any spaces to get to the OperandEntries. 6287 lexLeadingSpaces(); 6288 6289 return parseAndMatchAndEmitTargetInstruction( 6290 Info, OperationEntryVal, OperationEntryTok, OperationEntryLoc); 6291 } 6292 6293 bool HLASMAsmParser::parseStatement(ParseStatementInfo &Info, 6294 MCAsmParserSemaCallback *SI) { 6295 assert(!hasPendingError() && "parseStatement started with pending error"); 6296 6297 // Should the first token be interpreted as a HLASM Label. 6298 bool ShouldParseAsHLASMLabel = false; 6299 6300 // If a Name Entry exists, it should occur at the very 6301 // start of the string. In this case, we should parse the 6302 // first non-space token as a Label. 6303 // If the Name entry is missing (i.e. there's some other 6304 // token), then we attempt to parse the first non-space 6305 // token as a Machine Instruction. 6306 if (getTok().isNot(AsmToken::Space)) 6307 ShouldParseAsHLASMLabel = true; 6308 6309 // If we have an EndOfStatement (which includes the target's comment 6310 // string) we can appropriately lex it early on) 6311 if (Lexer.is(AsmToken::EndOfStatement)) { 6312 // if this is a line comment we can drop it safely 6313 if (getTok().getString().empty() || getTok().getString().front() == '\r' || 6314 getTok().getString().front() == '\n') 6315 Out.addBlankLine(); 6316 Lex(); 6317 return false; 6318 } 6319 6320 // We have established how to parse the inline asm statement. 6321 // Now we can safely lex any leading spaces to get to the 6322 // first token. 6323 lexLeadingSpaces(); 6324 6325 // If we see a new line or carriage return as the first operand, 6326 // after lexing leading spaces, emit the new line and lex the 6327 // EndOfStatement token. 6328 if (Lexer.is(AsmToken::EndOfStatement)) { 6329 if (getTok().getString().front() == '\n' || 6330 getTok().getString().front() == '\r') { 6331 Out.addBlankLine(); 6332 Lex(); 6333 return false; 6334 } 6335 } 6336 6337 // Handle the label first if we have to before processing the rest 6338 // of the tokens as a machine instruction. 6339 if (ShouldParseAsHLASMLabel) { 6340 // If there were any errors while handling and emitting the label, 6341 // early return. 6342 if (parseAsHLASMLabel(Info, SI)) { 6343 // If we know we've failed in parsing, simply eat until end of the 6344 // statement. This ensures that we don't process any other statements. 6345 eatToEndOfStatement(); 6346 return true; 6347 } 6348 } 6349 6350 return parseAsMachineInstruction(Info, SI); 6351 } 6352 6353 namespace llvm { 6354 namespace MCParserUtils { 6355 6356 /// Returns whether the given symbol is used anywhere in the given expression, 6357 /// or subexpressions. 6358 static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) { 6359 switch (Value->getKind()) { 6360 case MCExpr::Binary: { 6361 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value); 6362 return isSymbolUsedInExpression(Sym, BE->getLHS()) || 6363 isSymbolUsedInExpression(Sym, BE->getRHS()); 6364 } 6365 case MCExpr::Target: 6366 case MCExpr::Constant: 6367 return false; 6368 case MCExpr::SymbolRef: { 6369 const MCSymbol &S = 6370 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol(); 6371 if (S.isVariable()) 6372 return isSymbolUsedInExpression(Sym, S.getVariableValue()); 6373 return &S == Sym; 6374 } 6375 case MCExpr::Unary: 6376 return isSymbolUsedInExpression( 6377 Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr()); 6378 } 6379 6380 llvm_unreachable("Unknown expr kind!"); 6381 } 6382 6383 bool parseAssignmentExpression(StringRef Name, bool allow_redef, 6384 MCAsmParser &Parser, MCSymbol *&Sym, 6385 const MCExpr *&Value) { 6386 6387 // FIXME: Use better location, we should use proper tokens. 6388 SMLoc EqualLoc = Parser.getTok().getLoc(); 6389 if (Parser.parseExpression(Value)) 6390 return Parser.TokError("missing expression"); 6391 6392 // Note: we don't count b as used in "a = b". This is to allow 6393 // a = b 6394 // b = c 6395 6396 if (Parser.parseEOL()) 6397 return true; 6398 6399 // Validate that the LHS is allowed to be a variable (either it has not been 6400 // used as a symbol, or it is an absolute symbol). 6401 Sym = Parser.getContext().lookupSymbol(Name); 6402 if (Sym) { 6403 // Diagnose assignment to a label. 6404 // 6405 // FIXME: Diagnostics. Note the location of the definition as a label. 6406 // FIXME: Diagnose assignment to protected identifier (e.g., register name). 6407 if (isSymbolUsedInExpression(Sym, Value)) 6408 return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'"); 6409 else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() && 6410 !Sym->isVariable()) 6411 ; // Allow redefinitions of undefined symbols only used in directives. 6412 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef) 6413 ; // Allow redefinitions of variables that haven't yet been used. 6414 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef)) 6415 return Parser.Error(EqualLoc, "redefinition of '" + Name + "'"); 6416 else if (!Sym->isVariable()) 6417 return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'"); 6418 else if (!isa<MCConstantExpr>(Sym->getVariableValue())) 6419 return Parser.Error(EqualLoc, 6420 "invalid reassignment of non-absolute variable '" + 6421 Name + "'"); 6422 } else if (Name == ".") { 6423 Parser.getStreamer().emitValueToOffset(Value, 0, EqualLoc); 6424 return false; 6425 } else 6426 Sym = Parser.getContext().getOrCreateSymbol(Name); 6427 6428 Sym->setRedefinable(allow_redef); 6429 6430 return false; 6431 } 6432 6433 } // end namespace MCParserUtils 6434 } // end namespace llvm 6435 6436 /// Create an MCAsmParser instance. 6437 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C, 6438 MCStreamer &Out, const MCAsmInfo &MAI, 6439 unsigned CB) { 6440 if (C.getTargetTriple().isSystemZ() && C.getTargetTriple().isOSzOS()) 6441 return new HLASMAsmParser(SM, C, Out, MAI, CB); 6442 6443 return new AsmParser(SM, C, Out, MAI, CB); 6444 } 6445