1 //===- AsmParser.cpp - Parser for Assembly Files --------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This class implements the parser for assembly files. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/APFloat.h" 15 #include "llvm/ADT/STLExtras.h" 16 #include "llvm/ADT/SmallString.h" 17 #include "llvm/ADT/StringMap.h" 18 #include "llvm/ADT/Twine.h" 19 #include "llvm/MC/MCAsmInfo.h" 20 #include "llvm/MC/MCContext.h" 21 #include "llvm/MC/MCDwarf.h" 22 #include "llvm/MC/MCExpr.h" 23 #include "llvm/MC/MCInstPrinter.h" 24 #include "llvm/MC/MCInstrInfo.h" 25 #include "llvm/MC/MCObjectFileInfo.h" 26 #include "llvm/MC/MCParser/AsmCond.h" 27 #include "llvm/MC/MCParser/AsmLexer.h" 28 #include "llvm/MC/MCParser/MCAsmParser.h" 29 #include "llvm/MC/MCParser/MCAsmParserUtils.h" 30 #include "llvm/MC/MCParser/MCParsedAsmOperand.h" 31 #include "llvm/MC/MCParser/MCTargetAsmParser.h" 32 #include "llvm/MC/MCRegisterInfo.h" 33 #include "llvm/MC/MCSectionMachO.h" 34 #include "llvm/MC/MCStreamer.h" 35 #include "llvm/MC/MCSymbol.h" 36 #include "llvm/MC/MCValue.h" 37 #include "llvm/Support/ErrorHandling.h" 38 #include "llvm/Support/MathExtras.h" 39 #include "llvm/Support/MemoryBuffer.h" 40 #include "llvm/Support/SourceMgr.h" 41 #include "llvm/Support/raw_ostream.h" 42 #include <cctype> 43 #include <deque> 44 #include <string> 45 #include <vector> 46 using namespace llvm; 47 48 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {} 49 50 namespace { 51 /// \brief Helper types for tracking macro definitions. 52 typedef std::vector<AsmToken> MCAsmMacroArgument; 53 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments; 54 55 struct MCAsmMacroParameter { 56 StringRef Name; 57 MCAsmMacroArgument Value; 58 bool Required; 59 bool Vararg; 60 61 MCAsmMacroParameter() : Required(false), Vararg(false) {} 62 }; 63 64 typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters; 65 66 struct MCAsmMacro { 67 StringRef Name; 68 StringRef Body; 69 MCAsmMacroParameters Parameters; 70 71 public: 72 MCAsmMacro(StringRef N, StringRef B, MCAsmMacroParameters P) 73 : Name(N), Body(B), Parameters(std::move(P)) {} 74 }; 75 76 /// \brief Helper class for storing information about an active macro 77 /// instantiation. 78 struct MacroInstantiation { 79 /// The location of the instantiation. 80 SMLoc InstantiationLoc; 81 82 /// The buffer where parsing should resume upon instantiation completion. 83 int ExitBuffer; 84 85 /// The location where parsing should resume upon instantiation completion. 86 SMLoc ExitLoc; 87 88 /// The depth of TheCondStack at the start of the instantiation. 89 size_t CondStackDepth; 90 91 public: 92 MacroInstantiation(SMLoc IL, int EB, SMLoc EL, size_t CondStackDepth); 93 }; 94 95 struct ParseStatementInfo { 96 /// \brief The parsed operands from the last parsed statement. 97 SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands; 98 99 /// \brief The opcode from the last parsed instruction. 100 unsigned Opcode; 101 102 /// \brief Was there an error parsing the inline assembly? 103 bool ParseError; 104 105 SmallVectorImpl<AsmRewrite> *AsmRewrites; 106 107 ParseStatementInfo() : Opcode(~0U), ParseError(false), AsmRewrites(nullptr) {} 108 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites) 109 : Opcode(~0), ParseError(false), AsmRewrites(rewrites) {} 110 }; 111 112 /// \brief The concrete assembly parser instance. 113 class AsmParser : public MCAsmParser { 114 AsmParser(const AsmParser &) = delete; 115 void operator=(const AsmParser &) = delete; 116 private: 117 AsmLexer Lexer; 118 MCContext &Ctx; 119 MCStreamer &Out; 120 const MCAsmInfo &MAI; 121 SourceMgr &SrcMgr; 122 SourceMgr::DiagHandlerTy SavedDiagHandler; 123 void *SavedDiagContext; 124 std::unique_ptr<MCAsmParserExtension> PlatformParser; 125 126 /// This is the current buffer index we're lexing from as managed by the 127 /// SourceMgr object. 128 unsigned CurBuffer; 129 130 AsmCond TheCondState; 131 std::vector<AsmCond> TheCondStack; 132 133 /// \brief maps directive names to handler methods in parser 134 /// extensions. Extensions register themselves in this map by calling 135 /// addDirectiveHandler. 136 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap; 137 138 /// \brief Map of currently defined macros. 139 StringMap<MCAsmMacro> MacroMap; 140 141 /// \brief Stack of active macro instantiations. 142 std::vector<MacroInstantiation*> ActiveMacros; 143 144 /// \brief List of bodies of anonymous macros. 145 std::deque<MCAsmMacro> MacroLikeBodies; 146 147 /// Boolean tracking whether macro substitution is enabled. 148 unsigned MacrosEnabledFlag : 1; 149 150 /// \brief Keeps track of how many .macro's have been instantiated. 151 unsigned NumOfMacroInstantiations; 152 153 /// Flag tracking whether any errors have been encountered. 154 unsigned HadError : 1; 155 156 /// The values from the last parsed cpp hash file line comment if any. 157 struct CppHashInfoTy { 158 StringRef Filename; 159 int64_t LineNumber = 0; 160 SMLoc Loc; 161 unsigned Buf = 0; 162 }; 163 CppHashInfoTy CppHashInfo; 164 165 /// \brief List of forward directional labels for diagnosis at the end. 166 SmallVector<std::tuple<SMLoc, CppHashInfoTy, MCSymbol *>, 4> DirLabels; 167 168 /// When generating dwarf for assembly source files we need to calculate the 169 /// logical line number based on the last parsed cpp hash file line comment 170 /// and current line. Since this is slow and messes up the SourceMgr's 171 /// cache we save the last info we queried with SrcMgr.FindLineNumber(). 172 SMLoc LastQueryIDLoc; 173 unsigned LastQueryBuffer; 174 unsigned LastQueryLine; 175 176 /// AssemblerDialect. ~OU means unset value and use value provided by MAI. 177 unsigned AssemblerDialect; 178 179 /// \brief is Darwin compatibility enabled? 180 bool IsDarwin; 181 182 /// \brief Are we parsing ms-style inline assembly? 183 bool ParsingInlineAsm; 184 185 public: 186 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 187 const MCAsmInfo &MAI); 188 ~AsmParser() override; 189 190 bool Run(bool NoInitialTextSection, bool NoFinalize = false) override; 191 192 void addDirectiveHandler(StringRef Directive, 193 ExtensionDirectiveHandler Handler) override { 194 ExtensionDirectiveMap[Directive] = Handler; 195 } 196 197 void addAliasForDirective(StringRef Directive, StringRef Alias) override { 198 DirectiveKindMap[Directive] = DirectiveKindMap[Alias]; 199 } 200 201 public: 202 /// @name MCAsmParser Interface 203 /// { 204 205 SourceMgr &getSourceManager() override { return SrcMgr; } 206 MCAsmLexer &getLexer() override { return Lexer; } 207 MCContext &getContext() override { return Ctx; } 208 MCStreamer &getStreamer() override { return Out; } 209 unsigned getAssemblerDialect() override { 210 if (AssemblerDialect == ~0U) 211 return MAI.getAssemblerDialect(); 212 else 213 return AssemblerDialect; 214 } 215 void setAssemblerDialect(unsigned i) override { 216 AssemblerDialect = i; 217 } 218 219 void Note(SMLoc L, const Twine &Msg, 220 ArrayRef<SMRange> Ranges = None) override; 221 bool Warning(SMLoc L, const Twine &Msg, 222 ArrayRef<SMRange> Ranges = None) override; 223 bool Error(SMLoc L, const Twine &Msg, 224 ArrayRef<SMRange> Ranges = None) override; 225 226 const AsmToken &Lex() override; 227 228 void setParsingInlineAsm(bool V) override { ParsingInlineAsm = V; } 229 bool isParsingInlineAsm() override { return ParsingInlineAsm; } 230 231 bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString, 232 unsigned &NumOutputs, unsigned &NumInputs, 233 SmallVectorImpl<std::pair<void *,bool> > &OpDecls, 234 SmallVectorImpl<std::string> &Constraints, 235 SmallVectorImpl<std::string> &Clobbers, 236 const MCInstrInfo *MII, const MCInstPrinter *IP, 237 MCAsmParserSemaCallback &SI) override; 238 239 bool parseExpression(const MCExpr *&Res); 240 bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 241 bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) override; 242 bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 243 bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 244 SMLoc &EndLoc) override; 245 bool parseAbsoluteExpression(int64_t &Res) override; 246 247 /// \brief Parse an identifier or string (as a quoted identifier) 248 /// and set \p Res to the identifier contents. 249 bool parseIdentifier(StringRef &Res) override; 250 void eatToEndOfStatement() override; 251 252 void checkForValidSection() override; 253 254 bool getTokenLoc(SMLoc &Loc) { 255 Loc = getTok().getLoc(); 256 return false; 257 } 258 259 bool parseEOL(const Twine &ErrMsg) { 260 if (getTok().getKind() == AsmToken::Hash) { 261 StringRef CommentStr = parseStringToEndOfStatement(); 262 Lexer.Lex(); 263 Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr)); 264 } 265 if (getTok().getKind() != AsmToken::EndOfStatement) 266 return TokError(ErrMsg); 267 Lex(); 268 return false; 269 } 270 271 /// parseToken - If current token has the specified kind, eat it and 272 /// return success. Otherwise, emit the specified error and return failure. 273 bool parseToken(AsmToken::TokenKind T, const Twine &ErrMsg) { 274 if (T == AsmToken::EndOfStatement) 275 return parseEOL(ErrMsg); 276 if (getTok().getKind() != T) 277 return TokError(ErrMsg); 278 Lex(); 279 return false; 280 } 281 282 bool parseIntToken(int64_t &V, const Twine &ErrMsg) { 283 if (getTok().getKind() != AsmToken::Integer) 284 return TokError(ErrMsg); 285 V = getTok().getIntVal(); 286 Lex(); 287 return false; 288 } 289 290 /// } 291 292 private: 293 294 bool parseStatement(ParseStatementInfo &Info, 295 MCAsmParserSemaCallback *SI); 296 bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites); 297 bool parseCppHashLineFilenameComment(SMLoc L); 298 299 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body, 300 ArrayRef<MCAsmMacroParameter> Parameters); 301 bool expandMacro(raw_svector_ostream &OS, StringRef Body, 302 ArrayRef<MCAsmMacroParameter> Parameters, 303 ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable, 304 SMLoc L); 305 306 /// \brief Are macros enabled in the parser? 307 bool areMacrosEnabled() {return MacrosEnabledFlag;} 308 309 /// \brief Control a flag in the parser that enables or disables macros. 310 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;} 311 312 /// \brief Lookup a previously defined macro. 313 /// \param Name Macro name. 314 /// \returns Pointer to macro. NULL if no such macro was defined. 315 const MCAsmMacro* lookupMacro(StringRef Name); 316 317 /// \brief Define a new macro with the given name and information. 318 void defineMacro(StringRef Name, MCAsmMacro Macro); 319 320 /// \brief Undefine a macro. If no such macro was defined, it's a no-op. 321 void undefineMacro(StringRef Name); 322 323 /// \brief Are we inside a macro instantiation? 324 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();} 325 326 /// \brief Handle entry to macro instantiation. 327 /// 328 /// \param M The macro. 329 /// \param NameLoc Instantiation location. 330 bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc); 331 332 /// \brief Handle exit from macro instantiation. 333 void handleMacroExit(); 334 335 /// \brief Extract AsmTokens for a macro argument. 336 bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg); 337 338 /// \brief Parse all macro arguments for a given macro. 339 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A); 340 341 void printMacroInstantiations(); 342 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg, 343 ArrayRef<SMRange> Ranges = None) const { 344 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges); 345 } 346 static void DiagHandler(const SMDiagnostic &Diag, void *Context); 347 348 /// \brief Enter the specified file. This returns true on failure. 349 bool enterIncludeFile(const std::string &Filename); 350 351 /// \brief Process the specified file for the .incbin directive. 352 /// This returns true on failure. 353 bool processIncbinFile(const std::string &Filename); 354 355 /// \brief Reset the current lexer position to that given by \p Loc. The 356 /// current token is not set; clients should ensure Lex() is called 357 /// subsequently. 358 /// 359 /// \param InBuffer If not 0, should be the known buffer id that contains the 360 /// location. 361 void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0); 362 363 /// \brief Parse up to the end of statement and a return the contents from the 364 /// current token until the end of the statement; the current token on exit 365 /// will be either the EndOfStatement or EOF. 366 StringRef parseStringToEndOfStatement() override; 367 368 /// \brief Parse until the end of a statement or a comma is encountered, 369 /// return the contents from the current token up to the end or comma. 370 StringRef parseStringToComma(); 371 372 bool parseAssignment(StringRef Name, bool allow_redef, 373 bool NoDeadStrip = false); 374 375 unsigned getBinOpPrecedence(AsmToken::TokenKind K, 376 MCBinaryExpr::Opcode &Kind); 377 378 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); 379 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); 380 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); 381 382 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); 383 384 // Generic (target and platform independent) directive parsing. 385 enum DirectiveKind { 386 DK_NO_DIRECTIVE, // Placeholder 387 DK_SET, DK_EQU, DK_EQUIV, DK_ASCII, DK_ASCIZ, DK_STRING, DK_BYTE, DK_SHORT, 388 DK_RELOC, 389 DK_VALUE, DK_2BYTE, DK_LONG, DK_INT, DK_4BYTE, DK_QUAD, DK_8BYTE, DK_OCTA, 390 DK_SINGLE, DK_FLOAT, DK_DOUBLE, DK_ALIGN, DK_ALIGN32, DK_BALIGN, DK_BALIGNW, 391 DK_BALIGNL, DK_P2ALIGN, DK_P2ALIGNW, DK_P2ALIGNL, DK_ORG, DK_FILL, DK_ENDR, 392 DK_BUNDLE_ALIGN_MODE, DK_BUNDLE_LOCK, DK_BUNDLE_UNLOCK, 393 DK_ZERO, DK_EXTERN, DK_GLOBL, DK_GLOBAL, 394 DK_LAZY_REFERENCE, DK_NO_DEAD_STRIP, DK_SYMBOL_RESOLVER, 395 DK_PRIVATE_EXTERN, DK_REFERENCE, DK_WEAK_DEFINITION, DK_WEAK_REFERENCE, 396 DK_WEAK_DEF_CAN_BE_HIDDEN, DK_COMM, DK_COMMON, DK_LCOMM, DK_ABORT, 397 DK_INCLUDE, DK_INCBIN, DK_CODE16, DK_CODE16GCC, DK_REPT, DK_IRP, DK_IRPC, 398 DK_IF, DK_IFEQ, DK_IFGE, DK_IFGT, DK_IFLE, DK_IFLT, DK_IFNE, DK_IFB, 399 DK_IFNB, DK_IFC, DK_IFEQS, DK_IFNC, DK_IFNES, DK_IFDEF, DK_IFNDEF, 400 DK_IFNOTDEF, DK_ELSEIF, DK_ELSE, DK_ENDIF, 401 DK_SPACE, DK_SKIP, DK_FILE, DK_LINE, DK_LOC, DK_STABS, 402 DK_CV_FILE, DK_CV_LOC, DK_CV_LINETABLE, DK_CV_INLINE_LINETABLE, 403 DK_CV_DEF_RANGE, DK_CV_STRINGTABLE, DK_CV_FILECHECKSUMS, 404 DK_CFI_SECTIONS, DK_CFI_STARTPROC, DK_CFI_ENDPROC, DK_CFI_DEF_CFA, 405 DK_CFI_DEF_CFA_OFFSET, DK_CFI_ADJUST_CFA_OFFSET, DK_CFI_DEF_CFA_REGISTER, 406 DK_CFI_OFFSET, DK_CFI_REL_OFFSET, DK_CFI_PERSONALITY, DK_CFI_LSDA, 407 DK_CFI_REMEMBER_STATE, DK_CFI_RESTORE_STATE, DK_CFI_SAME_VALUE, 408 DK_CFI_RESTORE, DK_CFI_ESCAPE, DK_CFI_SIGNAL_FRAME, DK_CFI_UNDEFINED, 409 DK_CFI_REGISTER, DK_CFI_WINDOW_SAVE, 410 DK_MACROS_ON, DK_MACROS_OFF, 411 DK_MACRO, DK_EXITM, DK_ENDM, DK_ENDMACRO, DK_PURGEM, 412 DK_SLEB128, DK_ULEB128, 413 DK_ERR, DK_ERROR, DK_WARNING, 414 DK_END 415 }; 416 417 /// \brief Maps directive name --> DirectiveKind enum, for 418 /// directives parsed by this class. 419 StringMap<DirectiveKind> DirectiveKindMap; 420 421 // ".ascii", ".asciz", ".string" 422 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); 423 bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc" 424 bool parseDirectiveValue(unsigned Size); // ".byte", ".long", ... 425 bool parseDirectiveOctaValue(); // ".octa" 426 bool parseDirectiveRealValue(const fltSemantics &); // ".single", ... 427 bool parseDirectiveFill(); // ".fill" 428 bool parseDirectiveZero(); // ".zero" 429 // ".set", ".equ", ".equiv" 430 bool parseDirectiveSet(StringRef IDVal, bool allow_redef); 431 bool parseDirectiveOrg(); // ".org" 432 // ".align{,32}", ".p2align{,w,l}" 433 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize); 434 435 // ".file", ".line", ".loc", ".stabs" 436 bool parseDirectiveFile(SMLoc DirectiveLoc); 437 bool parseDirectiveLine(); 438 bool parseDirectiveLoc(); 439 bool parseDirectiveStabs(); 440 441 // ".cv_file", ".cv_loc", ".cv_linetable", "cv_inline_linetable", 442 // ".cv_def_range" 443 bool parseDirectiveCVFile(); 444 bool parseDirectiveCVLoc(); 445 bool parseDirectiveCVLinetable(); 446 bool parseDirectiveCVInlineLinetable(); 447 bool parseDirectiveCVDefRange(); 448 bool parseDirectiveCVStringTable(); 449 bool parseDirectiveCVFileChecksums(); 450 451 // .cfi directives 452 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc); 453 bool parseDirectiveCFIWindowSave(); 454 bool parseDirectiveCFISections(); 455 bool parseDirectiveCFIStartProc(); 456 bool parseDirectiveCFIEndProc(); 457 bool parseDirectiveCFIDefCfaOffset(); 458 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc); 459 bool parseDirectiveCFIAdjustCfaOffset(); 460 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc); 461 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc); 462 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc); 463 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality); 464 bool parseDirectiveCFIRememberState(); 465 bool parseDirectiveCFIRestoreState(); 466 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc); 467 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc); 468 bool parseDirectiveCFIEscape(); 469 bool parseDirectiveCFISignalFrame(); 470 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc); 471 472 // macro directives 473 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc); 474 bool parseDirectiveExitMacro(StringRef Directive); 475 bool parseDirectiveEndMacro(StringRef Directive); 476 bool parseDirectiveMacro(SMLoc DirectiveLoc); 477 bool parseDirectiveMacrosOnOff(StringRef Directive); 478 479 // ".bundle_align_mode" 480 bool parseDirectiveBundleAlignMode(); 481 // ".bundle_lock" 482 bool parseDirectiveBundleLock(); 483 // ".bundle_unlock" 484 bool parseDirectiveBundleUnlock(); 485 486 // ".space", ".skip" 487 bool parseDirectiveSpace(StringRef IDVal); 488 489 // .sleb128 (Signed=true) and .uleb128 (Signed=false) 490 bool parseDirectiveLEB128(bool Signed); 491 492 /// \brief Parse a directive like ".globl" which 493 /// accepts a single symbol (which should be a label or an external). 494 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr); 495 496 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm" 497 498 bool parseDirectiveAbort(); // ".abort" 499 bool parseDirectiveInclude(); // ".include" 500 bool parseDirectiveIncbin(); // ".incbin" 501 502 // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne" 503 bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind); 504 // ".ifb" or ".ifnb", depending on ExpectBlank. 505 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank); 506 // ".ifc" or ".ifnc", depending on ExpectEqual. 507 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual); 508 // ".ifeqs" or ".ifnes", depending on ExpectEqual. 509 bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual); 510 // ".ifdef" or ".ifndef", depending on expect_defined 511 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined); 512 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif" 513 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else" 514 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif 515 bool parseEscapedString(std::string &Data) override; 516 517 const MCExpr *applyModifierToExpr(const MCExpr *E, 518 MCSymbolRefExpr::VariantKind Variant); 519 520 // Macro-like directives 521 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc); 522 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 523 raw_svector_ostream &OS); 524 bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive); 525 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp" 526 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc" 527 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr" 528 529 // "_emit" or "__emit" 530 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info, 531 size_t Len); 532 533 // "align" 534 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info); 535 536 // "end" 537 bool parseDirectiveEnd(SMLoc DirectiveLoc); 538 539 // ".err" or ".error" 540 bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage); 541 542 // ".warning" 543 bool parseDirectiveWarning(SMLoc DirectiveLoc); 544 545 void initializeDirectiveKindMap(); 546 }; 547 } 548 549 namespace llvm { 550 551 extern MCAsmParserExtension *createDarwinAsmParser(); 552 extern MCAsmParserExtension *createELFAsmParser(); 553 extern MCAsmParserExtension *createCOFFAsmParser(); 554 555 } 556 557 enum { DEFAULT_ADDRSPACE = 0 }; 558 559 AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 560 const MCAsmInfo &MAI) 561 : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM), 562 PlatformParser(nullptr), CurBuffer(SM.getMainFileID()), 563 MacrosEnabledFlag(true), HadError(false), CppHashInfo(), 564 AssemblerDialect(~0U), IsDarwin(false), ParsingInlineAsm(false) { 565 // Save the old handler. 566 SavedDiagHandler = SrcMgr.getDiagHandler(); 567 SavedDiagContext = SrcMgr.getDiagContext(); 568 // Set our own handler which calls the saved handler. 569 SrcMgr.setDiagHandler(DiagHandler, this); 570 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 571 572 // Initialize the platform / file format parser. 573 switch (Ctx.getObjectFileInfo()->getObjectFileType()) { 574 case MCObjectFileInfo::IsCOFF: 575 PlatformParser.reset(createCOFFAsmParser()); 576 break; 577 case MCObjectFileInfo::IsMachO: 578 PlatformParser.reset(createDarwinAsmParser()); 579 IsDarwin = true; 580 break; 581 case MCObjectFileInfo::IsELF: 582 PlatformParser.reset(createELFAsmParser()); 583 break; 584 } 585 586 PlatformParser->Initialize(*this); 587 initializeDirectiveKindMap(); 588 589 NumOfMacroInstantiations = 0; 590 } 591 592 AsmParser::~AsmParser() { 593 assert((HadError || ActiveMacros.empty()) && 594 "Unexpected active macro instantiation!"); 595 } 596 597 void AsmParser::printMacroInstantiations() { 598 // Print the active macro instantiation stack. 599 for (std::vector<MacroInstantiation *>::const_reverse_iterator 600 it = ActiveMacros.rbegin(), 601 ie = ActiveMacros.rend(); 602 it != ie; ++it) 603 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note, 604 "while in macro instantiation"); 605 } 606 607 void AsmParser::Note(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { 608 printMessage(L, SourceMgr::DK_Note, Msg, Ranges); 609 printMacroInstantiations(); 610 } 611 612 bool AsmParser::Warning(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { 613 if(getTargetParser().getTargetOptions().MCNoWarn) 614 return false; 615 if (getTargetParser().getTargetOptions().MCFatalWarnings) 616 return Error(L, Msg, Ranges); 617 printMessage(L, SourceMgr::DK_Warning, Msg, Ranges); 618 printMacroInstantiations(); 619 return false; 620 } 621 622 bool AsmParser::Error(SMLoc L, const Twine &Msg, ArrayRef<SMRange> Ranges) { 623 HadError = true; 624 printMessage(L, SourceMgr::DK_Error, Msg, Ranges); 625 printMacroInstantiations(); 626 return true; 627 } 628 629 bool AsmParser::enterIncludeFile(const std::string &Filename) { 630 std::string IncludedFile; 631 unsigned NewBuf = 632 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 633 if (!NewBuf) 634 return true; 635 636 CurBuffer = NewBuf; 637 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 638 return false; 639 } 640 641 /// Process the specified .incbin file by searching for it in the include paths 642 /// then just emitting the byte contents of the file to the streamer. This 643 /// returns true on failure. 644 bool AsmParser::processIncbinFile(const std::string &Filename) { 645 std::string IncludedFile; 646 unsigned NewBuf = 647 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 648 if (!NewBuf) 649 return true; 650 651 // Pick up the bytes from the file and emit them. 652 getStreamer().EmitBytes(SrcMgr.getMemoryBuffer(NewBuf)->getBuffer()); 653 return false; 654 } 655 656 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) { 657 CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc); 658 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(), 659 Loc.getPointer()); 660 } 661 662 const AsmToken &AsmParser::Lex() { 663 if (Lexer.getTok().is(AsmToken::Error)) 664 Error(Lexer.getErrLoc(), Lexer.getErr()); 665 666 // if it's a end of statement with a comment in it 667 if (getTok().is(AsmToken::EndOfStatement)) { 668 // if this is a line comment output it. 669 if (getTok().getString().front() != '\n' && 670 getTok().getString().front() != '\r' && MAI.preserveAsmComments()) 671 Out.addExplicitComment(Twine(getTok().getString())); 672 } 673 674 const AsmToken *tok = &Lexer.Lex(); 675 676 // Parse comments here to be deferred until end of next statement. 677 while (tok->is(AsmToken::Comment)) { 678 if (MAI.preserveAsmComments()) 679 Out.addExplicitComment(Twine(tok->getString())); 680 tok = &Lexer.Lex(); 681 } 682 683 if (tok->is(AsmToken::Eof)) { 684 // If this is the end of an included file, pop the parent file off the 685 // include stack. 686 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer); 687 if (ParentIncludeLoc != SMLoc()) { 688 jumpToLoc(ParentIncludeLoc); 689 return Lex(); 690 } 691 } 692 693 694 return *tok; 695 } 696 697 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) { 698 // Create the initial section, if requested. 699 if (!NoInitialTextSection) 700 Out.InitSections(false); 701 702 // Prime the lexer. 703 Lex(); 704 705 HadError = false; 706 AsmCond StartingCondState = TheCondState; 707 708 // If we are generating dwarf for assembly source files save the initial text 709 // section and generate a .file directive. 710 if (getContext().getGenDwarfForAssembly()) { 711 MCSection *Sec = getStreamer().getCurrentSection().first; 712 if (!Sec->getBeginSymbol()) { 713 MCSymbol *SectionStartSym = getContext().createTempSymbol(); 714 getStreamer().EmitLabel(SectionStartSym); 715 Sec->setBeginSymbol(SectionStartSym); 716 } 717 bool InsertResult = getContext().addGenDwarfSection(Sec); 718 assert(InsertResult && ".text section should not have debug info yet"); 719 (void)InsertResult; 720 getContext().setGenDwarfFileNumber(getStreamer().EmitDwarfFileDirective( 721 0, StringRef(), getContext().getMainFileName())); 722 } 723 724 // While we have input, parse each statement. 725 while (Lexer.isNot(AsmToken::Eof)) { 726 ParseStatementInfo Info; 727 if (!parseStatement(Info, nullptr)) 728 continue; 729 730 // If we've failed, but on a Error Token, but did not consume it in 731 // favor of a better message, emit it now. 732 if (Lexer.getTok().is(AsmToken::Error)) { 733 Lex(); 734 } 735 736 // We had an error, validate that one was emitted and recover by skipping to 737 // the next line. 738 assert(HadError && "Parse statement returned an error, but none emitted!"); 739 eatToEndOfStatement(); 740 } 741 742 if (TheCondState.TheCond != StartingCondState.TheCond || 743 TheCondState.Ignore != StartingCondState.Ignore) 744 return TokError("unmatched .ifs or .elses"); 745 746 // Check to see there are no empty DwarfFile slots. 747 const auto &LineTables = getContext().getMCDwarfLineTables(); 748 if (!LineTables.empty()) { 749 unsigned Index = 0; 750 for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) { 751 if (File.Name.empty() && Index != 0) 752 TokError("unassigned file number: " + Twine(Index) + 753 " for .file directives"); 754 ++Index; 755 } 756 } 757 758 // Check to see that all assembler local symbols were actually defined. 759 // Targets that don't do subsections via symbols may not want this, though, 760 // so conservatively exclude them. Only do this if we're finalizing, though, 761 // as otherwise we won't necessarilly have seen everything yet. 762 if (!NoFinalize) { 763 if (MAI.hasSubsectionsViaSymbols()) { 764 for (const auto &TableEntry : getContext().getSymbols()) { 765 MCSymbol *Sym = TableEntry.getValue(); 766 // Variable symbols may not be marked as defined, so check those 767 // explicitly. If we know it's a variable, we have a definition for 768 // the purposes of this check. 769 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined()) 770 // FIXME: We would really like to refer back to where the symbol was 771 // first referenced for a source location. We need to add something 772 // to track that. Currently, we just point to the end of the file. 773 HadError |= 774 Error(getTok().getLoc(), "assembler local symbol '" + 775 Sym->getName() + "' not defined"); 776 } 777 } 778 779 // Temporary symbols like the ones for directional jumps don't go in the 780 // symbol table. They also need to be diagnosed in all (final) cases. 781 for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) { 782 if (std::get<2>(LocSym)->isUndefined()) { 783 // Reset the state of any "# line file" directives we've seen to the 784 // context as it was at the diagnostic site. 785 CppHashInfo = std::get<1>(LocSym); 786 HadError |= Error(std::get<0>(LocSym), "directional label undefined"); 787 } 788 } 789 } 790 791 // Finalize the output stream if there are no errors and if the client wants 792 // us to. 793 if (!HadError && !NoFinalize) 794 Out.Finish(); 795 796 return HadError || getContext().hadError(); 797 } 798 799 void AsmParser::checkForValidSection() { 800 if (!ParsingInlineAsm && !getStreamer().getCurrentSection().first) { 801 TokError("expected section directive before assembly directive"); 802 Out.InitSections(false); 803 } 804 } 805 806 /// \brief Throw away the rest of the line for testing purposes. 807 void AsmParser::eatToEndOfStatement() { 808 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 809 Lexer.Lex(); 810 811 // Eat EOL. 812 if (Lexer.is(AsmToken::EndOfStatement)) 813 Lexer.Lex(); 814 } 815 816 StringRef AsmParser::parseStringToEndOfStatement() { 817 const char *Start = getTok().getLoc().getPointer(); 818 819 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 820 Lexer.Lex(); 821 822 const char *End = getTok().getLoc().getPointer(); 823 return StringRef(Start, End - Start); 824 } 825 826 StringRef AsmParser::parseStringToComma() { 827 const char *Start = getTok().getLoc().getPointer(); 828 829 while (Lexer.isNot(AsmToken::EndOfStatement) && 830 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof)) 831 Lexer.Lex(); 832 833 const char *End = getTok().getLoc().getPointer(); 834 return StringRef(Start, End - Start); 835 } 836 837 /// \brief Parse a paren expression and return it. 838 /// NOTE: This assumes the leading '(' has already been consumed. 839 /// 840 /// parenexpr ::= expr) 841 /// 842 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) { 843 if (parseExpression(Res)) 844 return true; 845 if (Lexer.isNot(AsmToken::RParen)) 846 return TokError("expected ')' in parentheses expression"); 847 EndLoc = Lexer.getTok().getEndLoc(); 848 Lex(); 849 return false; 850 } 851 852 /// \brief Parse a bracket expression and return it. 853 /// NOTE: This assumes the leading '[' has already been consumed. 854 /// 855 /// bracketexpr ::= expr] 856 /// 857 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) { 858 if (parseExpression(Res)) 859 return true; 860 if (Lexer.isNot(AsmToken::RBrac)) 861 return TokError("expected ']' in brackets expression"); 862 EndLoc = Lexer.getTok().getEndLoc(); 863 Lex(); 864 return false; 865 } 866 867 /// \brief Parse a primary expression and return it. 868 /// primaryexpr ::= (parenexpr 869 /// primaryexpr ::= symbol 870 /// primaryexpr ::= number 871 /// primaryexpr ::= '.' 872 /// primaryexpr ::= ~,+,- primaryexpr 873 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) { 874 SMLoc FirstTokenLoc = getLexer().getLoc(); 875 AsmToken::TokenKind FirstTokenKind = Lexer.getKind(); 876 switch (FirstTokenKind) { 877 default: 878 return TokError("unknown token in expression"); 879 // If we have an error assume that we've already handled it. 880 case AsmToken::Error: 881 return true; 882 case AsmToken::Exclaim: 883 Lex(); // Eat the operator. 884 if (parsePrimaryExpr(Res, EndLoc)) 885 return true; 886 Res = MCUnaryExpr::createLNot(Res, getContext()); 887 return false; 888 case AsmToken::Dollar: 889 case AsmToken::At: 890 case AsmToken::String: 891 case AsmToken::Identifier: { 892 StringRef Identifier; 893 if (parseIdentifier(Identifier)) { 894 if (FirstTokenKind == AsmToken::Dollar) { 895 if (Lexer.getMAI().getDollarIsPC()) { 896 // This is a '$' reference, which references the current PC. Emit a 897 // temporary label to the streamer and refer to it. 898 MCSymbol *Sym = Ctx.createTempSymbol(); 899 Out.EmitLabel(Sym); 900 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, 901 getContext()); 902 EndLoc = FirstTokenLoc; 903 return false; 904 } 905 return Error(FirstTokenLoc, "invalid token in expression"); 906 } 907 } 908 // Parse symbol variant 909 std::pair<StringRef, StringRef> Split; 910 if (!MAI.useParensForSymbolVariant()) { 911 if (FirstTokenKind == AsmToken::String) { 912 if (Lexer.is(AsmToken::At)) { 913 Lex(); // eat @ 914 SMLoc AtLoc = getLexer().getLoc(); 915 StringRef VName; 916 if (parseIdentifier(VName)) 917 return Error(AtLoc, "expected symbol variant after '@'"); 918 919 Split = std::make_pair(Identifier, VName); 920 } 921 } else { 922 Split = Identifier.split('@'); 923 } 924 } else if (Lexer.is(AsmToken::LParen)) { 925 Lex(); // eat '('. 926 StringRef VName; 927 parseIdentifier(VName); 928 if (Lexer.isNot(AsmToken::RParen)) { 929 return Error(Lexer.getTok().getLoc(), 930 "unexpected token in variant, expected ')'"); 931 } 932 Lex(); // eat ')'. 933 Split = std::make_pair(Identifier, VName); 934 } 935 936 EndLoc = SMLoc::getFromPointer(Identifier.end()); 937 938 // This is a symbol reference. 939 StringRef SymbolName = Identifier; 940 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 941 942 // Lookup the symbol variant if used. 943 if (Split.second.size()) { 944 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 945 if (Variant != MCSymbolRefExpr::VK_Invalid) { 946 SymbolName = Split.first; 947 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) { 948 Variant = MCSymbolRefExpr::VK_None; 949 } else { 950 return Error(SMLoc::getFromPointer(Split.second.begin()), 951 "invalid variant '" + Split.second + "'"); 952 } 953 } 954 955 MCSymbol *Sym = getContext().getOrCreateSymbol(SymbolName); 956 957 // If this is an absolute variable reference, substitute it now to preserve 958 // semantics in the face of reassignment. 959 if (Sym->isVariable() && 960 isa<MCConstantExpr>(Sym->getVariableValue(/*SetUsed*/ false))) { 961 if (Variant) 962 return Error(EndLoc, "unexpected modifier on variable reference"); 963 964 Res = Sym->getVariableValue(/*SetUsed*/ false); 965 return false; 966 } 967 968 // Otherwise create a symbol ref. 969 Res = MCSymbolRefExpr::create(Sym, Variant, getContext()); 970 return false; 971 } 972 case AsmToken::BigNum: 973 return TokError("literal value out of range for directive"); 974 case AsmToken::Integer: { 975 SMLoc Loc = getTok().getLoc(); 976 int64_t IntVal = getTok().getIntVal(); 977 Res = MCConstantExpr::create(IntVal, getContext()); 978 EndLoc = Lexer.getTok().getEndLoc(); 979 Lex(); // Eat token. 980 // Look for 'b' or 'f' following an Integer as a directional label 981 if (Lexer.getKind() == AsmToken::Identifier) { 982 StringRef IDVal = getTok().getString(); 983 // Lookup the symbol variant if used. 984 std::pair<StringRef, StringRef> Split = IDVal.split('@'); 985 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 986 if (Split.first.size() != IDVal.size()) { 987 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 988 if (Variant == MCSymbolRefExpr::VK_Invalid) 989 return TokError("invalid variant '" + Split.second + "'"); 990 IDVal = Split.first; 991 } 992 if (IDVal == "f" || IDVal == "b") { 993 MCSymbol *Sym = 994 Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b"); 995 Res = MCSymbolRefExpr::create(Sym, Variant, getContext()); 996 if (IDVal == "b" && Sym->isUndefined()) 997 return Error(Loc, "directional label undefined"); 998 DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym)); 999 EndLoc = Lexer.getTok().getEndLoc(); 1000 Lex(); // Eat identifier. 1001 } 1002 } 1003 return false; 1004 } 1005 case AsmToken::Real: { 1006 APFloat RealVal(APFloat::IEEEdouble, getTok().getString()); 1007 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue(); 1008 Res = MCConstantExpr::create(IntVal, getContext()); 1009 EndLoc = Lexer.getTok().getEndLoc(); 1010 Lex(); // Eat token. 1011 return false; 1012 } 1013 case AsmToken::Dot: { 1014 // This is a '.' reference, which references the current PC. Emit a 1015 // temporary label to the streamer and refer to it. 1016 MCSymbol *Sym = Ctx.createTempSymbol(); 1017 Out.EmitLabel(Sym); 1018 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext()); 1019 EndLoc = Lexer.getTok().getEndLoc(); 1020 Lex(); // Eat identifier. 1021 return false; 1022 } 1023 case AsmToken::LParen: 1024 Lex(); // Eat the '('. 1025 return parseParenExpr(Res, EndLoc); 1026 case AsmToken::LBrac: 1027 if (!PlatformParser->HasBracketExpressions()) 1028 return TokError("brackets expression not supported on this target"); 1029 Lex(); // Eat the '['. 1030 return parseBracketExpr(Res, EndLoc); 1031 case AsmToken::Minus: 1032 Lex(); // Eat the operator. 1033 if (parsePrimaryExpr(Res, EndLoc)) 1034 return true; 1035 Res = MCUnaryExpr::createMinus(Res, getContext()); 1036 return false; 1037 case AsmToken::Plus: 1038 Lex(); // Eat the operator. 1039 if (parsePrimaryExpr(Res, EndLoc)) 1040 return true; 1041 Res = MCUnaryExpr::createPlus(Res, getContext()); 1042 return false; 1043 case AsmToken::Tilde: 1044 Lex(); // Eat the operator. 1045 if (parsePrimaryExpr(Res, EndLoc)) 1046 return true; 1047 Res = MCUnaryExpr::createNot(Res, getContext()); 1048 return false; 1049 } 1050 } 1051 1052 bool AsmParser::parseExpression(const MCExpr *&Res) { 1053 SMLoc EndLoc; 1054 return parseExpression(Res, EndLoc); 1055 } 1056 1057 const MCExpr * 1058 AsmParser::applyModifierToExpr(const MCExpr *E, 1059 MCSymbolRefExpr::VariantKind Variant) { 1060 // Ask the target implementation about this expression first. 1061 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx); 1062 if (NewE) 1063 return NewE; 1064 // Recurse over the given expression, rebuilding it to apply the given variant 1065 // if there is exactly one symbol. 1066 switch (E->getKind()) { 1067 case MCExpr::Target: 1068 case MCExpr::Constant: 1069 return nullptr; 1070 1071 case MCExpr::SymbolRef: { 1072 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E); 1073 1074 if (SRE->getKind() != MCSymbolRefExpr::VK_None) { 1075 TokError("invalid variant on expression '" + getTok().getIdentifier() + 1076 "' (already modified)"); 1077 return E; 1078 } 1079 1080 return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext()); 1081 } 1082 1083 case MCExpr::Unary: { 1084 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E); 1085 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant); 1086 if (!Sub) 1087 return nullptr; 1088 return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext()); 1089 } 1090 1091 case MCExpr::Binary: { 1092 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E); 1093 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant); 1094 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant); 1095 1096 if (!LHS && !RHS) 1097 return nullptr; 1098 1099 if (!LHS) 1100 LHS = BE->getLHS(); 1101 if (!RHS) 1102 RHS = BE->getRHS(); 1103 1104 return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext()); 1105 } 1106 } 1107 1108 llvm_unreachable("Invalid expression kind!"); 1109 } 1110 1111 /// \brief Parse an expression and return it. 1112 /// 1113 /// expr ::= expr &&,|| expr -> lowest. 1114 /// expr ::= expr |,^,&,! expr 1115 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr 1116 /// expr ::= expr <<,>> expr 1117 /// expr ::= expr +,- expr 1118 /// expr ::= expr *,/,% expr -> highest. 1119 /// expr ::= primaryexpr 1120 /// 1121 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1122 // Parse the expression. 1123 Res = nullptr; 1124 if (parsePrimaryExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc)) 1125 return true; 1126 1127 // As a special case, we support 'a op b @ modifier' by rewriting the 1128 // expression to include the modifier. This is inefficient, but in general we 1129 // expect users to use 'a@modifier op b'. 1130 if (Lexer.getKind() == AsmToken::At) { 1131 Lex(); 1132 1133 if (Lexer.isNot(AsmToken::Identifier)) 1134 return TokError("unexpected symbol modifier following '@'"); 1135 1136 MCSymbolRefExpr::VariantKind Variant = 1137 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier()); 1138 if (Variant == MCSymbolRefExpr::VK_Invalid) 1139 return TokError("invalid variant '" + getTok().getIdentifier() + "'"); 1140 1141 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant); 1142 if (!ModifiedRes) { 1143 return TokError("invalid modifier '" + getTok().getIdentifier() + 1144 "' (no symbols present)"); 1145 } 1146 1147 Res = ModifiedRes; 1148 Lex(); 1149 } 1150 1151 // Try to constant fold it up front, if possible. 1152 int64_t Value; 1153 if (Res->evaluateAsAbsolute(Value)) 1154 Res = MCConstantExpr::create(Value, getContext()); 1155 1156 return false; 1157 } 1158 1159 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1160 Res = nullptr; 1161 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc); 1162 } 1163 1164 bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 1165 SMLoc &EndLoc) { 1166 if (parseParenExpr(Res, EndLoc)) 1167 return true; 1168 1169 for (; ParenDepth > 0; --ParenDepth) { 1170 if (parseBinOpRHS(1, Res, EndLoc)) 1171 return true; 1172 1173 // We don't Lex() the last RParen. 1174 // This is the same behavior as parseParenExpression(). 1175 if (ParenDepth - 1 > 0) { 1176 if (Lexer.isNot(AsmToken::RParen)) 1177 return TokError("expected ')' in parentheses expression"); 1178 EndLoc = Lexer.getTok().getEndLoc(); 1179 Lex(); 1180 } 1181 } 1182 return false; 1183 } 1184 1185 bool AsmParser::parseAbsoluteExpression(int64_t &Res) { 1186 const MCExpr *Expr; 1187 1188 SMLoc StartLoc = Lexer.getLoc(); 1189 if (parseExpression(Expr)) 1190 return true; 1191 1192 if (!Expr->evaluateAsAbsolute(Res)) 1193 return Error(StartLoc, "expected absolute expression"); 1194 1195 return false; 1196 } 1197 1198 static unsigned getDarwinBinOpPrecedence(AsmToken::TokenKind K, 1199 MCBinaryExpr::Opcode &Kind, 1200 bool ShouldUseLogicalShr) { 1201 switch (K) { 1202 default: 1203 return 0; // not a binop. 1204 1205 // Lowest Precedence: &&, || 1206 case AsmToken::AmpAmp: 1207 Kind = MCBinaryExpr::LAnd; 1208 return 1; 1209 case AsmToken::PipePipe: 1210 Kind = MCBinaryExpr::LOr; 1211 return 1; 1212 1213 // Low Precedence: |, &, ^ 1214 // 1215 // FIXME: gas seems to support '!' as an infix operator? 1216 case AsmToken::Pipe: 1217 Kind = MCBinaryExpr::Or; 1218 return 2; 1219 case AsmToken::Caret: 1220 Kind = MCBinaryExpr::Xor; 1221 return 2; 1222 case AsmToken::Amp: 1223 Kind = MCBinaryExpr::And; 1224 return 2; 1225 1226 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >= 1227 case AsmToken::EqualEqual: 1228 Kind = MCBinaryExpr::EQ; 1229 return 3; 1230 case AsmToken::ExclaimEqual: 1231 case AsmToken::LessGreater: 1232 Kind = MCBinaryExpr::NE; 1233 return 3; 1234 case AsmToken::Less: 1235 Kind = MCBinaryExpr::LT; 1236 return 3; 1237 case AsmToken::LessEqual: 1238 Kind = MCBinaryExpr::LTE; 1239 return 3; 1240 case AsmToken::Greater: 1241 Kind = MCBinaryExpr::GT; 1242 return 3; 1243 case AsmToken::GreaterEqual: 1244 Kind = MCBinaryExpr::GTE; 1245 return 3; 1246 1247 // Intermediate Precedence: <<, >> 1248 case AsmToken::LessLess: 1249 Kind = MCBinaryExpr::Shl; 1250 return 4; 1251 case AsmToken::GreaterGreater: 1252 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1253 return 4; 1254 1255 // High Intermediate Precedence: +, - 1256 case AsmToken::Plus: 1257 Kind = MCBinaryExpr::Add; 1258 return 5; 1259 case AsmToken::Minus: 1260 Kind = MCBinaryExpr::Sub; 1261 return 5; 1262 1263 // Highest Precedence: *, /, % 1264 case AsmToken::Star: 1265 Kind = MCBinaryExpr::Mul; 1266 return 6; 1267 case AsmToken::Slash: 1268 Kind = MCBinaryExpr::Div; 1269 return 6; 1270 case AsmToken::Percent: 1271 Kind = MCBinaryExpr::Mod; 1272 return 6; 1273 } 1274 } 1275 1276 static unsigned getGNUBinOpPrecedence(AsmToken::TokenKind K, 1277 MCBinaryExpr::Opcode &Kind, 1278 bool ShouldUseLogicalShr) { 1279 switch (K) { 1280 default: 1281 return 0; // not a binop. 1282 1283 // Lowest Precedence: &&, || 1284 case AsmToken::AmpAmp: 1285 Kind = MCBinaryExpr::LAnd; 1286 return 2; 1287 case AsmToken::PipePipe: 1288 Kind = MCBinaryExpr::LOr; 1289 return 1; 1290 1291 // Low Precedence: ==, !=, <>, <, <=, >, >= 1292 case AsmToken::EqualEqual: 1293 Kind = MCBinaryExpr::EQ; 1294 return 3; 1295 case AsmToken::ExclaimEqual: 1296 case AsmToken::LessGreater: 1297 Kind = MCBinaryExpr::NE; 1298 return 3; 1299 case AsmToken::Less: 1300 Kind = MCBinaryExpr::LT; 1301 return 3; 1302 case AsmToken::LessEqual: 1303 Kind = MCBinaryExpr::LTE; 1304 return 3; 1305 case AsmToken::Greater: 1306 Kind = MCBinaryExpr::GT; 1307 return 3; 1308 case AsmToken::GreaterEqual: 1309 Kind = MCBinaryExpr::GTE; 1310 return 3; 1311 1312 // Low Intermediate Precedence: +, - 1313 case AsmToken::Plus: 1314 Kind = MCBinaryExpr::Add; 1315 return 4; 1316 case AsmToken::Minus: 1317 Kind = MCBinaryExpr::Sub; 1318 return 4; 1319 1320 // High Intermediate Precedence: |, &, ^ 1321 // 1322 // FIXME: gas seems to support '!' as an infix operator? 1323 case AsmToken::Pipe: 1324 Kind = MCBinaryExpr::Or; 1325 return 5; 1326 case AsmToken::Caret: 1327 Kind = MCBinaryExpr::Xor; 1328 return 5; 1329 case AsmToken::Amp: 1330 Kind = MCBinaryExpr::And; 1331 return 5; 1332 1333 // Highest Precedence: *, /, %, <<, >> 1334 case AsmToken::Star: 1335 Kind = MCBinaryExpr::Mul; 1336 return 6; 1337 case AsmToken::Slash: 1338 Kind = MCBinaryExpr::Div; 1339 return 6; 1340 case AsmToken::Percent: 1341 Kind = MCBinaryExpr::Mod; 1342 return 6; 1343 case AsmToken::LessLess: 1344 Kind = MCBinaryExpr::Shl; 1345 return 6; 1346 case AsmToken::GreaterGreater: 1347 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1348 return 6; 1349 } 1350 } 1351 1352 unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K, 1353 MCBinaryExpr::Opcode &Kind) { 1354 bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr(); 1355 return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr) 1356 : getGNUBinOpPrecedence(K, Kind, ShouldUseLogicalShr); 1357 } 1358 1359 /// \brief Parse all binary operators with precedence >= 'Precedence'. 1360 /// Res contains the LHS of the expression on input. 1361 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, 1362 SMLoc &EndLoc) { 1363 while (1) { 1364 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add; 1365 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind); 1366 1367 // If the next token is lower precedence than we are allowed to eat, return 1368 // successfully with what we ate already. 1369 if (TokPrec < Precedence) 1370 return false; 1371 1372 Lex(); 1373 1374 // Eat the next primary expression. 1375 const MCExpr *RHS; 1376 if (parsePrimaryExpr(RHS, EndLoc)) 1377 return true; 1378 1379 // If BinOp binds less tightly with RHS than the operator after RHS, let 1380 // the pending operator take RHS as its LHS. 1381 MCBinaryExpr::Opcode Dummy; 1382 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy); 1383 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc)) 1384 return true; 1385 1386 // Merge LHS and RHS according to operator. 1387 Res = MCBinaryExpr::create(Kind, Res, RHS, getContext()); 1388 } 1389 } 1390 1391 /// ParseStatement: 1392 /// ::= EndOfStatement 1393 /// ::= Label* Directive ...Operands... EndOfStatement 1394 /// ::= Label* Identifier OperandList* EndOfStatement 1395 bool AsmParser::parseStatement(ParseStatementInfo &Info, 1396 MCAsmParserSemaCallback *SI) { 1397 // Eat initial spaces and comments 1398 while (Lexer.is(AsmToken::Space)) 1399 Lex(); 1400 if (Lexer.is(AsmToken::EndOfStatement)) { 1401 // if this is a line comment we can drop it safely 1402 if (getTok().getString().front() == '\r' || 1403 getTok().getString().front() == '\n') 1404 Out.AddBlankLine(); 1405 Lex(); 1406 return false; 1407 } 1408 if (Lexer.is(AsmToken::Hash)) { 1409 // Seeing a hash here means that it was an end-of-line comment in 1410 // an asm syntax where hash's are not comment and the previous 1411 // statement parser did not check the end of statement. Relex as 1412 // EndOfStatement. 1413 StringRef CommentStr = parseStringToEndOfStatement(); 1414 Lexer.Lex(); 1415 Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr)); 1416 return false; 1417 } 1418 // Statements always start with an identifier. 1419 AsmToken ID = getTok(); 1420 SMLoc IDLoc = ID.getLoc(); 1421 StringRef IDVal; 1422 int64_t LocalLabelVal = -1; 1423 if (Lexer.is(AsmToken::HashDirective)) 1424 return parseCppHashLineFilenameComment(IDLoc); 1425 // Allow an integer followed by a ':' as a directional local label. 1426 if (Lexer.is(AsmToken::Integer)) { 1427 LocalLabelVal = getTok().getIntVal(); 1428 if (LocalLabelVal < 0) { 1429 if (!TheCondState.Ignore) 1430 return TokError("unexpected token at start of statement"); 1431 IDVal = ""; 1432 } else { 1433 IDVal = getTok().getString(); 1434 Lex(); // Consume the integer token to be used as an identifier token. 1435 if (Lexer.getKind() != AsmToken::Colon) { 1436 if (!TheCondState.Ignore) 1437 return TokError("unexpected token at start of statement"); 1438 } 1439 } 1440 } else if (Lexer.is(AsmToken::Dot)) { 1441 // Treat '.' as a valid identifier in this context. 1442 Lex(); 1443 IDVal = "."; 1444 } else if (Lexer.is(AsmToken::LCurly)) { 1445 // Treat '{' as a valid identifier in this context. 1446 Lex(); 1447 IDVal = "{"; 1448 1449 } else if (Lexer.is(AsmToken::RCurly)) { 1450 // Treat '}' as a valid identifier in this context. 1451 Lex(); 1452 IDVal = "}"; 1453 } else if (parseIdentifier(IDVal)) { 1454 if (!TheCondState.Ignore) 1455 return TokError("unexpected token at start of statement"); 1456 IDVal = ""; 1457 } 1458 1459 // Handle conditional assembly here before checking for skipping. We 1460 // have to do this so that .endif isn't skipped in a ".if 0" block for 1461 // example. 1462 StringMap<DirectiveKind>::const_iterator DirKindIt = 1463 DirectiveKindMap.find(IDVal); 1464 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end()) 1465 ? DK_NO_DIRECTIVE 1466 : DirKindIt->getValue(); 1467 switch (DirKind) { 1468 default: 1469 break; 1470 case DK_IF: 1471 case DK_IFEQ: 1472 case DK_IFGE: 1473 case DK_IFGT: 1474 case DK_IFLE: 1475 case DK_IFLT: 1476 case DK_IFNE: 1477 return parseDirectiveIf(IDLoc, DirKind); 1478 case DK_IFB: 1479 return parseDirectiveIfb(IDLoc, true); 1480 case DK_IFNB: 1481 return parseDirectiveIfb(IDLoc, false); 1482 case DK_IFC: 1483 return parseDirectiveIfc(IDLoc, true); 1484 case DK_IFEQS: 1485 return parseDirectiveIfeqs(IDLoc, true); 1486 case DK_IFNC: 1487 return parseDirectiveIfc(IDLoc, false); 1488 case DK_IFNES: 1489 return parseDirectiveIfeqs(IDLoc, false); 1490 case DK_IFDEF: 1491 return parseDirectiveIfdef(IDLoc, true); 1492 case DK_IFNDEF: 1493 case DK_IFNOTDEF: 1494 return parseDirectiveIfdef(IDLoc, false); 1495 case DK_ELSEIF: 1496 return parseDirectiveElseIf(IDLoc); 1497 case DK_ELSE: 1498 return parseDirectiveElse(IDLoc); 1499 case DK_ENDIF: 1500 return parseDirectiveEndIf(IDLoc); 1501 } 1502 1503 // Ignore the statement if in the middle of inactive conditional 1504 // (e.g. ".if 0"). 1505 if (TheCondState.Ignore) { 1506 eatToEndOfStatement(); 1507 return false; 1508 } 1509 1510 // FIXME: Recurse on local labels? 1511 1512 // See what kind of statement we have. 1513 switch (Lexer.getKind()) { 1514 case AsmToken::Colon: { 1515 if (!getTargetParser().isLabel(ID)) 1516 break; 1517 checkForValidSection(); 1518 1519 // identifier ':' -> Label. 1520 Lex(); 1521 1522 // Diagnose attempt to use '.' as a label. 1523 if (IDVal == ".") 1524 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label"); 1525 1526 // Diagnose attempt to use a variable as a label. 1527 // 1528 // FIXME: Diagnostics. Note the location of the definition as a label. 1529 // FIXME: This doesn't diagnose assignment to a symbol which has been 1530 // implicitly marked as external. 1531 MCSymbol *Sym; 1532 if (LocalLabelVal == -1) { 1533 if (ParsingInlineAsm && SI) { 1534 StringRef RewrittenLabel = 1535 SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true); 1536 assert(RewrittenLabel.size() && 1537 "We should have an internal name here."); 1538 Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(), 1539 RewrittenLabel); 1540 IDVal = RewrittenLabel; 1541 } 1542 Sym = getContext().getOrCreateSymbol(IDVal); 1543 } else 1544 Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal); 1545 1546 Sym->redefineIfPossible(); 1547 1548 if (!Sym->isUndefined() || Sym->isVariable()) 1549 return Error(IDLoc, "invalid symbol redefinition"); 1550 1551 // End of Labels should be treated as end of line for lexing 1552 // purposes but that information is not available to the Lexer who 1553 // does not understand Labels. This may cause us to see a Hash 1554 // here instead of a preprocessor line comment. 1555 if (getTok().is(AsmToken::Hash)) { 1556 StringRef CommentStr = parseStringToEndOfStatement(); 1557 Lexer.Lex(); 1558 Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr)); 1559 } 1560 1561 // Consume any end of statement token, if present, to avoid spurious 1562 // AddBlankLine calls(). 1563 if (getTok().is(AsmToken::EndOfStatement)) { 1564 Lex(); 1565 } 1566 1567 // Emit the label. 1568 if (!ParsingInlineAsm) 1569 Out.EmitLabel(Sym); 1570 1571 // If we are generating dwarf for assembly source files then gather the 1572 // info to make a dwarf label entry for this label if needed. 1573 if (getContext().getGenDwarfForAssembly()) 1574 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), 1575 IDLoc); 1576 1577 getTargetParser().onLabelParsed(Sym); 1578 1579 1580 1581 return false; 1582 } 1583 1584 case AsmToken::Equal: 1585 if (!getTargetParser().equalIsAsmAssignment()) 1586 break; 1587 // identifier '=' ... -> assignment statement 1588 Lex(); 1589 1590 return parseAssignment(IDVal, true); 1591 1592 default: // Normal instruction or directive. 1593 break; 1594 } 1595 1596 // If macros are enabled, check to see if this is a macro instantiation. 1597 if (areMacrosEnabled()) 1598 if (const MCAsmMacro *M = lookupMacro(IDVal)) { 1599 return handleMacroEntry(M, IDLoc); 1600 } 1601 1602 // Otherwise, we have a normal instruction or directive. 1603 1604 // Directives start with "." 1605 if (IDVal[0] == '.' && IDVal != ".") { 1606 // There are several entities interested in parsing directives: 1607 // 1608 // 1. The target-specific assembly parser. Some directives are target 1609 // specific or may potentially behave differently on certain targets. 1610 // 2. Asm parser extensions. For example, platform-specific parsers 1611 // (like the ELF parser) register themselves as extensions. 1612 // 3. The generic directive parser implemented by this class. These are 1613 // all the directives that behave in a target and platform independent 1614 // manner, or at least have a default behavior that's shared between 1615 // all targets and platforms. 1616 1617 // First query the target-specific parser. It will return 'true' if it 1618 // isn't interested in this directive. 1619 if (!getTargetParser().ParseDirective(ID)) 1620 return false; 1621 1622 // Next, check the extension directive map to see if any extension has 1623 // registered itself to parse this directive. 1624 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler = 1625 ExtensionDirectiveMap.lookup(IDVal); 1626 if (Handler.first) 1627 return (*Handler.second)(Handler.first, IDVal, IDLoc); 1628 1629 // Finally, if no one else is interested in this directive, it must be 1630 // generic and familiar to this class. 1631 switch (DirKind) { 1632 default: 1633 break; 1634 case DK_SET: 1635 case DK_EQU: 1636 return parseDirectiveSet(IDVal, true); 1637 case DK_EQUIV: 1638 return parseDirectiveSet(IDVal, false); 1639 case DK_ASCII: 1640 return parseDirectiveAscii(IDVal, false); 1641 case DK_ASCIZ: 1642 case DK_STRING: 1643 return parseDirectiveAscii(IDVal, true); 1644 case DK_BYTE: 1645 return parseDirectiveValue(1); 1646 case DK_SHORT: 1647 case DK_VALUE: 1648 case DK_2BYTE: 1649 return parseDirectiveValue(2); 1650 case DK_LONG: 1651 case DK_INT: 1652 case DK_4BYTE: 1653 return parseDirectiveValue(4); 1654 case DK_QUAD: 1655 case DK_8BYTE: 1656 return parseDirectiveValue(8); 1657 case DK_OCTA: 1658 return parseDirectiveOctaValue(); 1659 case DK_SINGLE: 1660 case DK_FLOAT: 1661 return parseDirectiveRealValue(APFloat::IEEEsingle); 1662 case DK_DOUBLE: 1663 return parseDirectiveRealValue(APFloat::IEEEdouble); 1664 case DK_ALIGN: { 1665 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 1666 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1); 1667 } 1668 case DK_ALIGN32: { 1669 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 1670 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4); 1671 } 1672 case DK_BALIGN: 1673 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); 1674 case DK_BALIGNW: 1675 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); 1676 case DK_BALIGNL: 1677 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); 1678 case DK_P2ALIGN: 1679 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); 1680 case DK_P2ALIGNW: 1681 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); 1682 case DK_P2ALIGNL: 1683 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); 1684 case DK_ORG: 1685 return parseDirectiveOrg(); 1686 case DK_FILL: 1687 return parseDirectiveFill(); 1688 case DK_ZERO: 1689 return parseDirectiveZero(); 1690 case DK_EXTERN: 1691 eatToEndOfStatement(); // .extern is the default, ignore it. 1692 return false; 1693 case DK_GLOBL: 1694 case DK_GLOBAL: 1695 return parseDirectiveSymbolAttribute(MCSA_Global); 1696 case DK_LAZY_REFERENCE: 1697 return parseDirectiveSymbolAttribute(MCSA_LazyReference); 1698 case DK_NO_DEAD_STRIP: 1699 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip); 1700 case DK_SYMBOL_RESOLVER: 1701 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver); 1702 case DK_PRIVATE_EXTERN: 1703 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern); 1704 case DK_REFERENCE: 1705 return parseDirectiveSymbolAttribute(MCSA_Reference); 1706 case DK_WEAK_DEFINITION: 1707 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition); 1708 case DK_WEAK_REFERENCE: 1709 return parseDirectiveSymbolAttribute(MCSA_WeakReference); 1710 case DK_WEAK_DEF_CAN_BE_HIDDEN: 1711 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); 1712 case DK_COMM: 1713 case DK_COMMON: 1714 return parseDirectiveComm(/*IsLocal=*/false); 1715 case DK_LCOMM: 1716 return parseDirectiveComm(/*IsLocal=*/true); 1717 case DK_ABORT: 1718 return parseDirectiveAbort(); 1719 case DK_INCLUDE: 1720 return parseDirectiveInclude(); 1721 case DK_INCBIN: 1722 return parseDirectiveIncbin(); 1723 case DK_CODE16: 1724 case DK_CODE16GCC: 1725 return TokError(Twine(IDVal) + 1726 " not currently supported for this target"); 1727 case DK_REPT: 1728 return parseDirectiveRept(IDLoc, IDVal); 1729 case DK_IRP: 1730 return parseDirectiveIrp(IDLoc); 1731 case DK_IRPC: 1732 return parseDirectiveIrpc(IDLoc); 1733 case DK_ENDR: 1734 return parseDirectiveEndr(IDLoc); 1735 case DK_BUNDLE_ALIGN_MODE: 1736 return parseDirectiveBundleAlignMode(); 1737 case DK_BUNDLE_LOCK: 1738 return parseDirectiveBundleLock(); 1739 case DK_BUNDLE_UNLOCK: 1740 return parseDirectiveBundleUnlock(); 1741 case DK_SLEB128: 1742 return parseDirectiveLEB128(true); 1743 case DK_ULEB128: 1744 return parseDirectiveLEB128(false); 1745 case DK_SPACE: 1746 case DK_SKIP: 1747 return parseDirectiveSpace(IDVal); 1748 case DK_FILE: 1749 return parseDirectiveFile(IDLoc); 1750 case DK_LINE: 1751 return parseDirectiveLine(); 1752 case DK_LOC: 1753 return parseDirectiveLoc(); 1754 case DK_STABS: 1755 return parseDirectiveStabs(); 1756 case DK_CV_FILE: 1757 return parseDirectiveCVFile(); 1758 case DK_CV_LOC: 1759 return parseDirectiveCVLoc(); 1760 case DK_CV_LINETABLE: 1761 return parseDirectiveCVLinetable(); 1762 case DK_CV_INLINE_LINETABLE: 1763 return parseDirectiveCVInlineLinetable(); 1764 case DK_CV_DEF_RANGE: 1765 return parseDirectiveCVDefRange(); 1766 case DK_CV_STRINGTABLE: 1767 return parseDirectiveCVStringTable(); 1768 case DK_CV_FILECHECKSUMS: 1769 return parseDirectiveCVFileChecksums(); 1770 case DK_CFI_SECTIONS: 1771 return parseDirectiveCFISections(); 1772 case DK_CFI_STARTPROC: 1773 return parseDirectiveCFIStartProc(); 1774 case DK_CFI_ENDPROC: 1775 return parseDirectiveCFIEndProc(); 1776 case DK_CFI_DEF_CFA: 1777 return parseDirectiveCFIDefCfa(IDLoc); 1778 case DK_CFI_DEF_CFA_OFFSET: 1779 return parseDirectiveCFIDefCfaOffset(); 1780 case DK_CFI_ADJUST_CFA_OFFSET: 1781 return parseDirectiveCFIAdjustCfaOffset(); 1782 case DK_CFI_DEF_CFA_REGISTER: 1783 return parseDirectiveCFIDefCfaRegister(IDLoc); 1784 case DK_CFI_OFFSET: 1785 return parseDirectiveCFIOffset(IDLoc); 1786 case DK_CFI_REL_OFFSET: 1787 return parseDirectiveCFIRelOffset(IDLoc); 1788 case DK_CFI_PERSONALITY: 1789 return parseDirectiveCFIPersonalityOrLsda(true); 1790 case DK_CFI_LSDA: 1791 return parseDirectiveCFIPersonalityOrLsda(false); 1792 case DK_CFI_REMEMBER_STATE: 1793 return parseDirectiveCFIRememberState(); 1794 case DK_CFI_RESTORE_STATE: 1795 return parseDirectiveCFIRestoreState(); 1796 case DK_CFI_SAME_VALUE: 1797 return parseDirectiveCFISameValue(IDLoc); 1798 case DK_CFI_RESTORE: 1799 return parseDirectiveCFIRestore(IDLoc); 1800 case DK_CFI_ESCAPE: 1801 return parseDirectiveCFIEscape(); 1802 case DK_CFI_SIGNAL_FRAME: 1803 return parseDirectiveCFISignalFrame(); 1804 case DK_CFI_UNDEFINED: 1805 return parseDirectiveCFIUndefined(IDLoc); 1806 case DK_CFI_REGISTER: 1807 return parseDirectiveCFIRegister(IDLoc); 1808 case DK_CFI_WINDOW_SAVE: 1809 return parseDirectiveCFIWindowSave(); 1810 case DK_MACROS_ON: 1811 case DK_MACROS_OFF: 1812 return parseDirectiveMacrosOnOff(IDVal); 1813 case DK_MACRO: 1814 return parseDirectiveMacro(IDLoc); 1815 case DK_EXITM: 1816 return parseDirectiveExitMacro(IDVal); 1817 case DK_ENDM: 1818 case DK_ENDMACRO: 1819 return parseDirectiveEndMacro(IDVal); 1820 case DK_PURGEM: 1821 return parseDirectivePurgeMacro(IDLoc); 1822 case DK_END: 1823 return parseDirectiveEnd(IDLoc); 1824 case DK_ERR: 1825 return parseDirectiveError(IDLoc, false); 1826 case DK_ERROR: 1827 return parseDirectiveError(IDLoc, true); 1828 case DK_WARNING: 1829 return parseDirectiveWarning(IDLoc); 1830 case DK_RELOC: 1831 return parseDirectiveReloc(IDLoc); 1832 } 1833 1834 return Error(IDLoc, "unknown directive"); 1835 } 1836 1837 // __asm _emit or __asm __emit 1838 if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" || 1839 IDVal == "_EMIT" || IDVal == "__EMIT")) 1840 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size()); 1841 1842 // __asm align 1843 if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN")) 1844 return parseDirectiveMSAlign(IDLoc, Info); 1845 1846 if (ParsingInlineAsm && (IDVal == "even")) 1847 Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4); 1848 checkForValidSection(); 1849 1850 // Canonicalize the opcode to lower case. 1851 std::string OpcodeStr = IDVal.lower(); 1852 ParseInstructionInfo IInfo(Info.AsmRewrites); 1853 bool HadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID, 1854 Info.ParsedOperands); 1855 Info.ParseError = HadError; 1856 1857 // Dump the parsed representation, if requested. 1858 if (getShowParsedOperands()) { 1859 SmallString<256> Str; 1860 raw_svector_ostream OS(Str); 1861 OS << "parsed instruction: ["; 1862 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) { 1863 if (i != 0) 1864 OS << ", "; 1865 Info.ParsedOperands[i]->print(OS); 1866 } 1867 OS << "]"; 1868 1869 printMessage(IDLoc, SourceMgr::DK_Note, OS.str()); 1870 } 1871 1872 // If we are generating dwarf for the current section then generate a .loc 1873 // directive for the instruction. 1874 if (!HadError && getContext().getGenDwarfForAssembly() && 1875 getContext().getGenDwarfSectionSyms().count( 1876 getStreamer().getCurrentSection().first)) { 1877 unsigned Line; 1878 if (ActiveMacros.empty()) 1879 Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer); 1880 else 1881 Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc, 1882 ActiveMacros.front()->ExitBuffer); 1883 1884 // If we previously parsed a cpp hash file line comment then make sure the 1885 // current Dwarf File is for the CppHashFilename if not then emit the 1886 // Dwarf File table for it and adjust the line number for the .loc. 1887 if (CppHashInfo.Filename.size()) { 1888 unsigned FileNumber = getStreamer().EmitDwarfFileDirective( 1889 0, StringRef(), CppHashInfo.Filename); 1890 getContext().setGenDwarfFileNumber(FileNumber); 1891 1892 // Since SrcMgr.FindLineNumber() is slow and messes up the SourceMgr's 1893 // cache with the different Loc from the call above we save the last 1894 // info we queried here with SrcMgr.FindLineNumber(). 1895 unsigned CppHashLocLineNo; 1896 if (LastQueryIDLoc == CppHashInfo.Loc && 1897 LastQueryBuffer == CppHashInfo.Buf) 1898 CppHashLocLineNo = LastQueryLine; 1899 else { 1900 CppHashLocLineNo = 1901 SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf); 1902 LastQueryLine = CppHashLocLineNo; 1903 LastQueryIDLoc = CppHashInfo.Loc; 1904 LastQueryBuffer = CppHashInfo.Buf; 1905 } 1906 Line = CppHashInfo.LineNumber - 1 + (Line - CppHashLocLineNo); 1907 } 1908 1909 getStreamer().EmitDwarfLocDirective( 1910 getContext().getGenDwarfFileNumber(), Line, 0, 1911 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0, 1912 StringRef()); 1913 } 1914 1915 // If parsing succeeded, match the instruction. 1916 if (!HadError) { 1917 uint64_t ErrorInfo; 1918 getTargetParser().MatchAndEmitInstruction(IDLoc, Info.Opcode, 1919 Info.ParsedOperands, Out, 1920 ErrorInfo, ParsingInlineAsm); 1921 } 1922 1923 // Don't skip the rest of the line, the instruction parser is responsible for 1924 // that. 1925 return false; 1926 } 1927 1928 // Parse and erase curly braces marking block start/end 1929 bool 1930 AsmParser::parseCurlyBlockScope(SmallVectorImpl<AsmRewrite> &AsmStrRewrites) { 1931 // Identify curly brace marking block start/end 1932 if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly)) 1933 return false; 1934 1935 SMLoc StartLoc = Lexer.getLoc(); 1936 Lex(); // Eat the brace 1937 if (Lexer.is(AsmToken::EndOfStatement)) 1938 Lex(); // Eat EndOfStatement following the brace 1939 1940 // Erase the block start/end brace from the output asm string 1941 AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() - 1942 StartLoc.getPointer()); 1943 return true; 1944 } 1945 1946 /// parseCppHashLineFilenameComment as this: 1947 /// ::= # number "filename" 1948 bool AsmParser::parseCppHashLineFilenameComment(SMLoc L) { 1949 Lex(); // Eat the hash token. 1950 // Lexer only ever emits HashDirective if it fully formed if it's 1951 // done the checking already so this is an internal error. 1952 assert(getTok().is(AsmToken::Integer) && 1953 "Lexing Cpp line comment: Expected Integer"); 1954 int64_t LineNumber = getTok().getIntVal(); 1955 Lex(); 1956 assert(getTok().is(AsmToken::String) && 1957 "Lexing Cpp line comment: Expected String"); 1958 StringRef Filename = getTok().getString(); 1959 Lex(); 1960 // Get rid of the enclosing quotes. 1961 Filename = Filename.substr(1, Filename.size() - 2); 1962 1963 // Save the SMLoc, Filename and LineNumber for later use by diagnostics. 1964 CppHashInfo.Loc = L; 1965 CppHashInfo.Filename = Filename; 1966 CppHashInfo.LineNumber = LineNumber; 1967 CppHashInfo.Buf = CurBuffer; 1968 return false; 1969 } 1970 1971 /// \brief will use the last parsed cpp hash line filename comment 1972 /// for the Filename and LineNo if any in the diagnostic. 1973 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) { 1974 const AsmParser *Parser = static_cast<const AsmParser *>(Context); 1975 raw_ostream &OS = errs(); 1976 1977 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr(); 1978 SMLoc DiagLoc = Diag.getLoc(); 1979 unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 1980 unsigned CppHashBuf = 1981 Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashInfo.Loc); 1982 1983 // Like SourceMgr::printMessage() we need to print the include stack if any 1984 // before printing the message. 1985 unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 1986 if (!Parser->SavedDiagHandler && DiagCurBuffer && 1987 DiagCurBuffer != DiagSrcMgr.getMainFileID()) { 1988 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer); 1989 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS); 1990 } 1991 1992 // If we have not parsed a cpp hash line filename comment or the source 1993 // manager changed or buffer changed (like in a nested include) then just 1994 // print the normal diagnostic using its Filename and LineNo. 1995 if (!Parser->CppHashInfo.LineNumber || &DiagSrcMgr != &Parser->SrcMgr || 1996 DiagBuf != CppHashBuf) { 1997 if (Parser->SavedDiagHandler) 1998 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); 1999 else 2000 Diag.print(nullptr, OS); 2001 return; 2002 } 2003 2004 // Use the CppHashFilename and calculate a line number based on the 2005 // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc 2006 // for the diagnostic. 2007 const std::string &Filename = Parser->CppHashInfo.Filename; 2008 2009 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf); 2010 int CppHashLocLineNo = 2011 Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf); 2012 int LineNo = 2013 Parser->CppHashInfo.LineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo); 2014 2015 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo, 2016 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(), 2017 Diag.getLineContents(), Diag.getRanges()); 2018 2019 if (Parser->SavedDiagHandler) 2020 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext); 2021 else 2022 NewDiag.print(nullptr, OS); 2023 } 2024 2025 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The 2026 // difference being that that function accepts '@' as part of identifiers and 2027 // we can't do that. AsmLexer.cpp should probably be changed to handle 2028 // '@' as a special case when needed. 2029 static bool isIdentifierChar(char c) { 2030 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' || 2031 c == '.'; 2032 } 2033 2034 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body, 2035 ArrayRef<MCAsmMacroParameter> Parameters, 2036 ArrayRef<MCAsmMacroArgument> A, 2037 bool EnableAtPseudoVariable, SMLoc L) { 2038 unsigned NParameters = Parameters.size(); 2039 bool HasVararg = NParameters ? Parameters.back().Vararg : false; 2040 if ((!IsDarwin || NParameters != 0) && NParameters != A.size()) 2041 return Error(L, "Wrong number of arguments"); 2042 2043 // A macro without parameters is handled differently on Darwin: 2044 // gas accepts no arguments and does no substitutions 2045 while (!Body.empty()) { 2046 // Scan for the next substitution. 2047 std::size_t End = Body.size(), Pos = 0; 2048 for (; Pos != End; ++Pos) { 2049 // Check for a substitution or escape. 2050 if (IsDarwin && !NParameters) { 2051 // This macro has no parameters, look for $0, $1, etc. 2052 if (Body[Pos] != '$' || Pos + 1 == End) 2053 continue; 2054 2055 char Next = Body[Pos + 1]; 2056 if (Next == '$' || Next == 'n' || 2057 isdigit(static_cast<unsigned char>(Next))) 2058 break; 2059 } else { 2060 // This macro has parameters, look for \foo, \bar, etc. 2061 if (Body[Pos] == '\\' && Pos + 1 != End) 2062 break; 2063 } 2064 } 2065 2066 // Add the prefix. 2067 OS << Body.slice(0, Pos); 2068 2069 // Check if we reached the end. 2070 if (Pos == End) 2071 break; 2072 2073 if (IsDarwin && !NParameters) { 2074 switch (Body[Pos + 1]) { 2075 // $$ => $ 2076 case '$': 2077 OS << '$'; 2078 break; 2079 2080 // $n => number of arguments 2081 case 'n': 2082 OS << A.size(); 2083 break; 2084 2085 // $[0-9] => argument 2086 default: { 2087 // Missing arguments are ignored. 2088 unsigned Index = Body[Pos + 1] - '0'; 2089 if (Index >= A.size()) 2090 break; 2091 2092 // Otherwise substitute with the token values, with spaces eliminated. 2093 for (const AsmToken &Token : A[Index]) 2094 OS << Token.getString(); 2095 break; 2096 } 2097 } 2098 Pos += 2; 2099 } else { 2100 unsigned I = Pos + 1; 2101 2102 // Check for the \@ pseudo-variable. 2103 if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End) 2104 ++I; 2105 else 2106 while (isIdentifierChar(Body[I]) && I + 1 != End) 2107 ++I; 2108 2109 const char *Begin = Body.data() + Pos + 1; 2110 StringRef Argument(Begin, I - (Pos + 1)); 2111 unsigned Index = 0; 2112 2113 if (Argument == "@") { 2114 OS << NumOfMacroInstantiations; 2115 Pos += 2; 2116 } else { 2117 for (; Index < NParameters; ++Index) 2118 if (Parameters[Index].Name == Argument) 2119 break; 2120 2121 if (Index == NParameters) { 2122 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 2123 Pos += 3; 2124 else { 2125 OS << '\\' << Argument; 2126 Pos = I; 2127 } 2128 } else { 2129 bool VarargParameter = HasVararg && Index == (NParameters - 1); 2130 for (const AsmToken &Token : A[Index]) 2131 // We expect no quotes around the string's contents when 2132 // parsing for varargs. 2133 if (Token.getKind() != AsmToken::String || VarargParameter) 2134 OS << Token.getString(); 2135 else 2136 OS << Token.getStringContents(); 2137 2138 Pos += 1 + Argument.size(); 2139 } 2140 } 2141 } 2142 // Update the scan point. 2143 Body = Body.substr(Pos); 2144 } 2145 2146 return false; 2147 } 2148 2149 MacroInstantiation::MacroInstantiation(SMLoc IL, int EB, SMLoc EL, 2150 size_t CondStackDepth) 2151 : InstantiationLoc(IL), ExitBuffer(EB), ExitLoc(EL), 2152 CondStackDepth(CondStackDepth) {} 2153 2154 static bool isOperator(AsmToken::TokenKind kind) { 2155 switch (kind) { 2156 default: 2157 return false; 2158 case AsmToken::Plus: 2159 case AsmToken::Minus: 2160 case AsmToken::Tilde: 2161 case AsmToken::Slash: 2162 case AsmToken::Star: 2163 case AsmToken::Dot: 2164 case AsmToken::Equal: 2165 case AsmToken::EqualEqual: 2166 case AsmToken::Pipe: 2167 case AsmToken::PipePipe: 2168 case AsmToken::Caret: 2169 case AsmToken::Amp: 2170 case AsmToken::AmpAmp: 2171 case AsmToken::Exclaim: 2172 case AsmToken::ExclaimEqual: 2173 case AsmToken::Less: 2174 case AsmToken::LessEqual: 2175 case AsmToken::LessLess: 2176 case AsmToken::LessGreater: 2177 case AsmToken::Greater: 2178 case AsmToken::GreaterEqual: 2179 case AsmToken::GreaterGreater: 2180 return true; 2181 } 2182 } 2183 2184 namespace { 2185 class AsmLexerSkipSpaceRAII { 2186 public: 2187 AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) { 2188 Lexer.setSkipSpace(SkipSpace); 2189 } 2190 2191 ~AsmLexerSkipSpaceRAII() { 2192 Lexer.setSkipSpace(true); 2193 } 2194 2195 private: 2196 AsmLexer &Lexer; 2197 }; 2198 } 2199 2200 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) { 2201 2202 if (Vararg) { 2203 if (Lexer.isNot(AsmToken::EndOfStatement)) { 2204 StringRef Str = parseStringToEndOfStatement(); 2205 MA.emplace_back(AsmToken::String, Str); 2206 } 2207 return false; 2208 } 2209 2210 unsigned ParenLevel = 0; 2211 2212 // Darwin doesn't use spaces to delmit arguments. 2213 AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin); 2214 2215 bool SpaceEaten; 2216 2217 for (;;) { 2218 SpaceEaten = false; 2219 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) 2220 return TokError("unexpected token in macro instantiation"); 2221 2222 if (ParenLevel == 0) { 2223 2224 if (Lexer.is(AsmToken::Comma)) 2225 break; 2226 2227 if (Lexer.is(AsmToken::Space)) { 2228 SpaceEaten = true; 2229 Lexer.Lex(); // Eat spaces 2230 } 2231 2232 // Spaces can delimit parameters, but could also be part an expression. 2233 // If the token after a space is an operator, add the token and the next 2234 // one into this argument 2235 if (!IsDarwin) { 2236 if (isOperator(Lexer.getKind())) { 2237 MA.push_back(getTok()); 2238 Lexer.Lex(); 2239 2240 // Whitespace after an operator can be ignored. 2241 if (Lexer.is(AsmToken::Space)) 2242 Lexer.Lex(); 2243 2244 continue; 2245 } 2246 } 2247 if (SpaceEaten) 2248 break; 2249 } 2250 2251 // handleMacroEntry relies on not advancing the lexer here 2252 // to be able to fill in the remaining default parameter values 2253 if (Lexer.is(AsmToken::EndOfStatement)) 2254 break; 2255 2256 // Adjust the current parentheses level. 2257 if (Lexer.is(AsmToken::LParen)) 2258 ++ParenLevel; 2259 else if (Lexer.is(AsmToken::RParen) && ParenLevel) 2260 --ParenLevel; 2261 2262 // Append the token to the current argument list. 2263 MA.push_back(getTok()); 2264 Lexer.Lex(); 2265 } 2266 2267 if (ParenLevel != 0) 2268 return TokError("unbalanced parentheses in macro argument"); 2269 return false; 2270 } 2271 2272 // Parse the macro instantiation arguments. 2273 bool AsmParser::parseMacroArguments(const MCAsmMacro *M, 2274 MCAsmMacroArguments &A) { 2275 const unsigned NParameters = M ? M->Parameters.size() : 0; 2276 bool NamedParametersFound = false; 2277 SmallVector<SMLoc, 4> FALocs; 2278 2279 A.resize(NParameters); 2280 FALocs.resize(NParameters); 2281 2282 // Parse two kinds of macro invocations: 2283 // - macros defined without any parameters accept an arbitrary number of them 2284 // - macros defined with parameters accept at most that many of them 2285 bool HasVararg = NParameters ? M->Parameters.back().Vararg : false; 2286 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters; 2287 ++Parameter) { 2288 SMLoc IDLoc = Lexer.getLoc(); 2289 MCAsmMacroParameter FA; 2290 2291 if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) { 2292 if (parseIdentifier(FA.Name)) { 2293 Error(IDLoc, "invalid argument identifier for formal argument"); 2294 eatToEndOfStatement(); 2295 return true; 2296 } 2297 2298 if (!Lexer.is(AsmToken::Equal)) { 2299 TokError("expected '=' after formal parameter identifier"); 2300 eatToEndOfStatement(); 2301 return true; 2302 } 2303 Lex(); 2304 2305 NamedParametersFound = true; 2306 } 2307 2308 if (NamedParametersFound && FA.Name.empty()) { 2309 Error(IDLoc, "cannot mix positional and keyword arguments"); 2310 eatToEndOfStatement(); 2311 return true; 2312 } 2313 2314 bool Vararg = HasVararg && Parameter == (NParameters - 1); 2315 if (parseMacroArgument(FA.Value, Vararg)) 2316 return true; 2317 2318 unsigned PI = Parameter; 2319 if (!FA.Name.empty()) { 2320 unsigned FAI = 0; 2321 for (FAI = 0; FAI < NParameters; ++FAI) 2322 if (M->Parameters[FAI].Name == FA.Name) 2323 break; 2324 2325 if (FAI >= NParameters) { 2326 assert(M && "expected macro to be defined"); 2327 Error(IDLoc, 2328 "parameter named '" + FA.Name + "' does not exist for macro '" + 2329 M->Name + "'"); 2330 return true; 2331 } 2332 PI = FAI; 2333 } 2334 2335 if (!FA.Value.empty()) { 2336 if (A.size() <= PI) 2337 A.resize(PI + 1); 2338 A[PI] = FA.Value; 2339 2340 if (FALocs.size() <= PI) 2341 FALocs.resize(PI + 1); 2342 2343 FALocs[PI] = Lexer.getLoc(); 2344 } 2345 2346 // At the end of the statement, fill in remaining arguments that have 2347 // default values. If there aren't any, then the next argument is 2348 // required but missing 2349 if (Lexer.is(AsmToken::EndOfStatement)) { 2350 bool Failure = false; 2351 for (unsigned FAI = 0; FAI < NParameters; ++FAI) { 2352 if (A[FAI].empty()) { 2353 if (M->Parameters[FAI].Required) { 2354 Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(), 2355 "missing value for required parameter " 2356 "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'"); 2357 Failure = true; 2358 } 2359 2360 if (!M->Parameters[FAI].Value.empty()) 2361 A[FAI] = M->Parameters[FAI].Value; 2362 } 2363 } 2364 return Failure; 2365 } 2366 2367 if (Lexer.is(AsmToken::Comma)) 2368 Lex(); 2369 } 2370 2371 return TokError("too many positional arguments"); 2372 } 2373 2374 const MCAsmMacro *AsmParser::lookupMacro(StringRef Name) { 2375 StringMap<MCAsmMacro>::iterator I = MacroMap.find(Name); 2376 return (I == MacroMap.end()) ? nullptr : &I->getValue(); 2377 } 2378 2379 void AsmParser::defineMacro(StringRef Name, MCAsmMacro Macro) { 2380 MacroMap.insert(std::make_pair(Name, std::move(Macro))); 2381 } 2382 2383 void AsmParser::undefineMacro(StringRef Name) { MacroMap.erase(Name); } 2384 2385 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) { 2386 // Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate 2387 // this, although we should protect against infinite loops. 2388 if (ActiveMacros.size() == 20) 2389 return TokError("macros cannot be nested more than 20 levels deep"); 2390 2391 MCAsmMacroArguments A; 2392 if (parseMacroArguments(M, A)) 2393 return true; 2394 2395 // Macro instantiation is lexical, unfortunately. We construct a new buffer 2396 // to hold the macro body with substitutions. 2397 SmallString<256> Buf; 2398 StringRef Body = M->Body; 2399 raw_svector_ostream OS(Buf); 2400 2401 if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc())) 2402 return true; 2403 2404 // We include the .endmacro in the buffer as our cue to exit the macro 2405 // instantiation. 2406 OS << ".endmacro\n"; 2407 2408 std::unique_ptr<MemoryBuffer> Instantiation = 2409 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 2410 2411 // Create the macro instantiation object and add to the current macro 2412 // instantiation stack. 2413 MacroInstantiation *MI = new MacroInstantiation( 2414 NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()); 2415 ActiveMacros.push_back(MI); 2416 2417 ++NumOfMacroInstantiations; 2418 2419 // Jump to the macro instantiation and prime the lexer. 2420 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 2421 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 2422 Lex(); 2423 2424 return false; 2425 } 2426 2427 void AsmParser::handleMacroExit() { 2428 // Jump to the EndOfStatement we should return to, and consume it. 2429 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer); 2430 Lex(); 2431 2432 // Pop the instantiation entry. 2433 delete ActiveMacros.back(); 2434 ActiveMacros.pop_back(); 2435 } 2436 2437 bool AsmParser::parseAssignment(StringRef Name, bool allow_redef, 2438 bool NoDeadStrip) { 2439 MCSymbol *Sym; 2440 const MCExpr *Value; 2441 if (MCParserUtils::parseAssignmentExpression(Name, allow_redef, *this, Sym, 2442 Value)) 2443 return true; 2444 2445 if (!Sym) { 2446 // In the case where we parse an expression starting with a '.', we will 2447 // not generate an error, nor will we create a symbol. In this case we 2448 // should just return out. 2449 return false; 2450 } 2451 2452 // Do the assignment. 2453 Out.EmitAssignment(Sym, Value); 2454 if (NoDeadStrip) 2455 Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip); 2456 2457 return false; 2458 } 2459 2460 /// parseIdentifier: 2461 /// ::= identifier 2462 /// ::= string 2463 bool AsmParser::parseIdentifier(StringRef &Res) { 2464 // The assembler has relaxed rules for accepting identifiers, in particular we 2465 // allow things like '.globl $foo' and '.def @feat.00', which would normally be 2466 // separate tokens. At this level, we have already lexed so we cannot (currently) 2467 // handle this as a context dependent token, instead we detect adjacent tokens 2468 // and return the combined identifier. 2469 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) { 2470 SMLoc PrefixLoc = getLexer().getLoc(); 2471 2472 // Consume the prefix character, and check for a following identifier. 2473 Lexer.Lex(); // Lexer's Lex guarantees consecutive token. 2474 if (Lexer.isNot(AsmToken::Identifier)) 2475 return true; 2476 2477 // We have a '$' or '@' followed by an identifier, make sure they are adjacent. 2478 if (PrefixLoc.getPointer() + 1 != getTok().getLoc().getPointer()) 2479 return true; 2480 2481 // Construct the joined identifier and consume the token. 2482 Res = 2483 StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1); 2484 Lex(); // Parser Lex to maintain invariants. 2485 return false; 2486 } 2487 2488 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String)) 2489 return true; 2490 2491 Res = getTok().getIdentifier(); 2492 2493 Lex(); // Consume the identifier token. 2494 2495 return false; 2496 } 2497 2498 /// parseDirectiveSet: 2499 /// ::= .equ identifier ',' expression 2500 /// ::= .equiv identifier ',' expression 2501 /// ::= .set identifier ',' expression 2502 bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) { 2503 StringRef Name; 2504 2505 if (parseIdentifier(Name)) 2506 return TokError("expected identifier after '" + Twine(IDVal) + "'"); 2507 2508 if (getLexer().isNot(AsmToken::Comma)) 2509 return TokError("unexpected token in '" + Twine(IDVal) + "'"); 2510 Lex(); 2511 2512 return parseAssignment(Name, allow_redef, true); 2513 } 2514 2515 bool AsmParser::parseEscapedString(std::string &Data) { 2516 assert(getLexer().is(AsmToken::String) && "Unexpected current token!"); 2517 2518 Data = ""; 2519 StringRef Str = getTok().getStringContents(); 2520 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 2521 if (Str[i] != '\\') { 2522 Data += Str[i]; 2523 continue; 2524 } 2525 2526 // Recognize escaped characters. Note that this escape semantics currently 2527 // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes. 2528 ++i; 2529 if (i == e) 2530 return TokError("unexpected backslash at end of string"); 2531 2532 // Recognize octal sequences. 2533 if ((unsigned)(Str[i] - '0') <= 7) { 2534 // Consume up to three octal characters. 2535 unsigned Value = Str[i] - '0'; 2536 2537 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 2538 ++i; 2539 Value = Value * 8 + (Str[i] - '0'); 2540 2541 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 2542 ++i; 2543 Value = Value * 8 + (Str[i] - '0'); 2544 } 2545 } 2546 2547 if (Value > 255) 2548 return TokError("invalid octal escape sequence (out of range)"); 2549 2550 Data += (unsigned char)Value; 2551 continue; 2552 } 2553 2554 // Otherwise recognize individual escapes. 2555 switch (Str[i]) { 2556 default: 2557 // Just reject invalid escape sequences for now. 2558 return TokError("invalid escape sequence (unrecognized character)"); 2559 2560 case 'b': Data += '\b'; break; 2561 case 'f': Data += '\f'; break; 2562 case 'n': Data += '\n'; break; 2563 case 'r': Data += '\r'; break; 2564 case 't': Data += '\t'; break; 2565 case '"': Data += '"'; break; 2566 case '\\': Data += '\\'; break; 2567 } 2568 } 2569 2570 return false; 2571 } 2572 2573 /// parseDirectiveAscii: 2574 /// ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ] 2575 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) { 2576 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2577 checkForValidSection(); 2578 2579 for (;;) { 2580 if (getLexer().isNot(AsmToken::String)) 2581 return TokError("expected string in '" + Twine(IDVal) + "' directive"); 2582 2583 std::string Data; 2584 if (parseEscapedString(Data)) 2585 return true; 2586 2587 getStreamer().EmitBytes(Data); 2588 if (ZeroTerminated) 2589 getStreamer().EmitBytes(StringRef("\0", 1)); 2590 2591 Lex(); 2592 2593 if (getLexer().is(AsmToken::EndOfStatement)) 2594 break; 2595 2596 if (getLexer().isNot(AsmToken::Comma)) 2597 return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); 2598 Lex(); 2599 } 2600 } 2601 2602 Lex(); 2603 return false; 2604 } 2605 2606 /// parseDirectiveReloc 2607 /// ::= .reloc expression , identifier [ , expression ] 2608 bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) { 2609 const MCExpr *Offset; 2610 const MCExpr *Expr = nullptr; 2611 2612 SMLoc OffsetLoc = Lexer.getTok().getLoc(); 2613 if (parseExpression(Offset)) 2614 return true; 2615 2616 // We can only deal with constant expressions at the moment. 2617 int64_t OffsetValue; 2618 if (!Offset->evaluateAsAbsolute(OffsetValue)) 2619 return Error(OffsetLoc, "expression is not a constant value"); 2620 2621 if (OffsetValue < 0) 2622 return Error(OffsetLoc, "expression is negative"); 2623 2624 if (Lexer.isNot(AsmToken::Comma)) 2625 return TokError("expected comma"); 2626 Lex(); 2627 2628 if (Lexer.isNot(AsmToken::Identifier)) 2629 return TokError("expected relocation name"); 2630 SMLoc NameLoc = Lexer.getTok().getLoc(); 2631 StringRef Name = Lexer.getTok().getIdentifier(); 2632 Lex(); 2633 2634 if (Lexer.is(AsmToken::Comma)) { 2635 Lex(); 2636 SMLoc ExprLoc = Lexer.getLoc(); 2637 if (parseExpression(Expr)) 2638 return true; 2639 2640 MCValue Value; 2641 if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr)) 2642 return Error(ExprLoc, "expression must be relocatable"); 2643 } 2644 2645 if (Lexer.isNot(AsmToken::EndOfStatement)) 2646 return TokError("unexpected token in .reloc directive"); 2647 2648 if (getStreamer().EmitRelocDirective(*Offset, Name, Expr, DirectiveLoc)) 2649 return Error(NameLoc, "unknown relocation name"); 2650 2651 return false; 2652 } 2653 2654 /// parseDirectiveValue 2655 /// ::= (.byte | .short | ... ) [ expression (, expression)* ] 2656 bool AsmParser::parseDirectiveValue(unsigned Size) { 2657 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2658 checkForValidSection(); 2659 2660 for (;;) { 2661 const MCExpr *Value; 2662 SMLoc ExprLoc = getLexer().getLoc(); 2663 if (parseExpression(Value)) 2664 return true; 2665 2666 // Special case constant expressions to match code generator. 2667 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 2668 assert(Size <= 8 && "Invalid size"); 2669 uint64_t IntValue = MCE->getValue(); 2670 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 2671 return Error(ExprLoc, "literal value out of range for directive"); 2672 getStreamer().EmitIntValue(IntValue, Size); 2673 } else 2674 getStreamer().EmitValue(Value, Size, ExprLoc); 2675 2676 if (getLexer().is(AsmToken::EndOfStatement)) 2677 break; 2678 2679 // FIXME: Improve diagnostic. 2680 if (getLexer().isNot(AsmToken::Comma)) 2681 return TokError("unexpected token in directive"); 2682 Lex(); 2683 } 2684 } 2685 2686 Lex(); 2687 return false; 2688 } 2689 2690 /// ParseDirectiveOctaValue 2691 /// ::= .octa [ hexconstant (, hexconstant)* ] 2692 bool AsmParser::parseDirectiveOctaValue() { 2693 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2694 checkForValidSection(); 2695 2696 for (;;) { 2697 if (Lexer.getKind() == AsmToken::Error) 2698 return true; 2699 if (Lexer.getKind() != AsmToken::Integer && 2700 Lexer.getKind() != AsmToken::BigNum) 2701 return TokError("unknown token in expression"); 2702 2703 SMLoc ExprLoc = getLexer().getLoc(); 2704 APInt IntValue = getTok().getAPIntVal(); 2705 Lex(); 2706 2707 uint64_t hi, lo; 2708 if (IntValue.isIntN(64)) { 2709 hi = 0; 2710 lo = IntValue.getZExtValue(); 2711 } else if (IntValue.isIntN(128)) { 2712 // It might actually have more than 128 bits, but the top ones are zero. 2713 hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue(); 2714 lo = IntValue.getLoBits(64).getZExtValue(); 2715 } else 2716 return Error(ExprLoc, "literal value out of range for directive"); 2717 2718 if (MAI.isLittleEndian()) { 2719 getStreamer().EmitIntValue(lo, 8); 2720 getStreamer().EmitIntValue(hi, 8); 2721 } else { 2722 getStreamer().EmitIntValue(hi, 8); 2723 getStreamer().EmitIntValue(lo, 8); 2724 } 2725 2726 if (getLexer().is(AsmToken::EndOfStatement)) 2727 break; 2728 2729 // FIXME: Improve diagnostic. 2730 if (getLexer().isNot(AsmToken::Comma)) 2731 return TokError("unexpected token in directive"); 2732 Lex(); 2733 } 2734 } 2735 2736 Lex(); 2737 return false; 2738 } 2739 2740 /// parseDirectiveRealValue 2741 /// ::= (.single | .double) [ expression (, expression)* ] 2742 bool AsmParser::parseDirectiveRealValue(const fltSemantics &Semantics) { 2743 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2744 checkForValidSection(); 2745 2746 for (;;) { 2747 // We don't truly support arithmetic on floating point expressions, so we 2748 // have to manually parse unary prefixes. 2749 bool IsNeg = false; 2750 if (getLexer().is(AsmToken::Minus)) { 2751 Lexer.Lex(); 2752 IsNeg = true; 2753 } else if (getLexer().is(AsmToken::Plus)) 2754 Lexer.Lex(); 2755 2756 if (Lexer.is(AsmToken::Error)) 2757 return TokError(Lexer.getErr()); 2758 if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) && 2759 Lexer.isNot(AsmToken::Identifier)) 2760 return TokError("unexpected token in directive"); 2761 2762 // Convert to an APFloat. 2763 APFloat Value(Semantics); 2764 StringRef IDVal = getTok().getString(); 2765 if (getLexer().is(AsmToken::Identifier)) { 2766 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf")) 2767 Value = APFloat::getInf(Semantics); 2768 else if (!IDVal.compare_lower("nan")) 2769 Value = APFloat::getNaN(Semantics, false, ~0); 2770 else 2771 return TokError("invalid floating point literal"); 2772 } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) == 2773 APFloat::opInvalidOp) 2774 return TokError("invalid floating point literal"); 2775 if (IsNeg) 2776 Value.changeSign(); 2777 2778 // Consume the numeric token. 2779 Lex(); 2780 2781 // Emit the value as an integer. 2782 APInt AsInt = Value.bitcastToAPInt(); 2783 getStreamer().EmitIntValue(AsInt.getLimitedValue(), 2784 AsInt.getBitWidth() / 8); 2785 2786 if (Lexer.is(AsmToken::EndOfStatement)) 2787 break; 2788 2789 if (Lexer.isNot(AsmToken::Comma)) 2790 return TokError("unexpected token in directive"); 2791 Lex(); 2792 } 2793 } 2794 2795 Lex(); 2796 return false; 2797 } 2798 2799 /// parseDirectiveZero 2800 /// ::= .zero expression 2801 bool AsmParser::parseDirectiveZero() { 2802 checkForValidSection(); 2803 2804 SMLoc NumBytesLoc = Lexer.getLoc(); 2805 const MCExpr *NumBytes; 2806 if (parseExpression(NumBytes)) 2807 return true; 2808 2809 int64_t Val = 0; 2810 if (getLexer().is(AsmToken::Comma)) { 2811 Lex(); 2812 if (parseAbsoluteExpression(Val)) 2813 return true; 2814 } 2815 2816 if (getLexer().isNot(AsmToken::EndOfStatement)) 2817 return TokError("unexpected token in '.zero' directive"); 2818 2819 Lex(); 2820 2821 getStreamer().emitFill(*NumBytes, Val, NumBytesLoc); 2822 2823 return false; 2824 } 2825 2826 /// parseDirectiveFill 2827 /// ::= .fill expression [ , expression [ , expression ] ] 2828 bool AsmParser::parseDirectiveFill() { 2829 checkForValidSection(); 2830 2831 SMLoc NumValuesLoc = Lexer.getLoc(); 2832 const MCExpr *NumValues; 2833 if (parseExpression(NumValues)) 2834 return true; 2835 2836 int64_t FillSize = 1; 2837 int64_t FillExpr = 0; 2838 2839 SMLoc SizeLoc, ExprLoc; 2840 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2841 if (getLexer().isNot(AsmToken::Comma)) 2842 return TokError("unexpected token in '.fill' directive"); 2843 Lex(); 2844 2845 SizeLoc = getLexer().getLoc(); 2846 if (parseAbsoluteExpression(FillSize)) 2847 return true; 2848 2849 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2850 if (getLexer().isNot(AsmToken::Comma)) 2851 return TokError("unexpected token in '.fill' directive"); 2852 Lex(); 2853 2854 ExprLoc = getLexer().getLoc(); 2855 if (parseAbsoluteExpression(FillExpr)) 2856 return true; 2857 2858 if (getLexer().isNot(AsmToken::EndOfStatement)) 2859 return TokError("unexpected token in '.fill' directive"); 2860 2861 Lex(); 2862 } 2863 } 2864 2865 if (FillSize < 0) { 2866 Warning(SizeLoc, "'.fill' directive with negative size has no effect"); 2867 return false; 2868 } 2869 if (FillSize > 8) { 2870 Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8"); 2871 FillSize = 8; 2872 } 2873 2874 if (!isUInt<32>(FillExpr) && FillSize > 4) 2875 Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits"); 2876 2877 getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc); 2878 2879 return false; 2880 } 2881 2882 /// parseDirectiveOrg 2883 /// ::= .org expression [ , expression ] 2884 bool AsmParser::parseDirectiveOrg() { 2885 checkForValidSection(); 2886 2887 const MCExpr *Offset; 2888 if (parseExpression(Offset)) 2889 return true; 2890 2891 // Parse optional fill expression. 2892 int64_t FillExpr = 0; 2893 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2894 if (getLexer().isNot(AsmToken::Comma)) 2895 return TokError("unexpected token in '.org' directive"); 2896 Lex(); 2897 2898 if (parseAbsoluteExpression(FillExpr)) 2899 return true; 2900 2901 if (getLexer().isNot(AsmToken::EndOfStatement)) 2902 return TokError("unexpected token in '.org' directive"); 2903 } 2904 2905 Lex(); 2906 getStreamer().emitValueToOffset(Offset, FillExpr); 2907 return false; 2908 } 2909 2910 /// parseDirectiveAlign 2911 /// ::= {.align, ...} expression [ , expression [ , expression ]] 2912 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) { 2913 checkForValidSection(); 2914 2915 SMLoc AlignmentLoc = getLexer().getLoc(); 2916 int64_t Alignment; 2917 if (parseAbsoluteExpression(Alignment)) 2918 return true; 2919 2920 SMLoc MaxBytesLoc; 2921 bool HasFillExpr = false; 2922 int64_t FillExpr = 0; 2923 int64_t MaxBytesToFill = 0; 2924 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2925 if (getLexer().isNot(AsmToken::Comma)) 2926 return TokError("unexpected token in directive"); 2927 Lex(); 2928 2929 // The fill expression can be omitted while specifying a maximum number of 2930 // alignment bytes, e.g: 2931 // .align 3,,4 2932 if (getLexer().isNot(AsmToken::Comma)) { 2933 HasFillExpr = true; 2934 if (parseAbsoluteExpression(FillExpr)) 2935 return true; 2936 } 2937 2938 if (getLexer().isNot(AsmToken::EndOfStatement)) { 2939 if (getLexer().isNot(AsmToken::Comma)) 2940 return TokError("unexpected token in directive"); 2941 Lex(); 2942 2943 MaxBytesLoc = getLexer().getLoc(); 2944 if (parseAbsoluteExpression(MaxBytesToFill)) 2945 return true; 2946 2947 if (getLexer().isNot(AsmToken::EndOfStatement)) 2948 return TokError("unexpected token in directive"); 2949 } 2950 } 2951 2952 Lex(); 2953 2954 if (!HasFillExpr) 2955 FillExpr = 0; 2956 2957 // Compute alignment in bytes. 2958 if (IsPow2) { 2959 // FIXME: Diagnose overflow. 2960 if (Alignment >= 32) { 2961 Error(AlignmentLoc, "invalid alignment value"); 2962 Alignment = 31; 2963 } 2964 2965 Alignment = 1ULL << Alignment; 2966 } else { 2967 // Reject alignments that aren't either a power of two or zero, 2968 // for gas compatibility. Alignment of zero is silently rounded 2969 // up to one. 2970 if (Alignment == 0) 2971 Alignment = 1; 2972 if (!isPowerOf2_64(Alignment)) 2973 Error(AlignmentLoc, "alignment must be a power of 2"); 2974 } 2975 2976 // Diagnose non-sensical max bytes to align. 2977 if (MaxBytesLoc.isValid()) { 2978 if (MaxBytesToFill < 1) { 2979 Error(MaxBytesLoc, "alignment directive can never be satisfied in this " 2980 "many bytes, ignoring maximum bytes expression"); 2981 MaxBytesToFill = 0; 2982 } 2983 2984 if (MaxBytesToFill >= Alignment) { 2985 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and " 2986 "has no effect"); 2987 MaxBytesToFill = 0; 2988 } 2989 } 2990 2991 // Check whether we should use optimal code alignment for this .align 2992 // directive. 2993 const MCSection *Section = getStreamer().getCurrentSection().first; 2994 assert(Section && "must have section to emit alignment"); 2995 bool UseCodeAlign = Section->UseCodeAlign(); 2996 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) && 2997 ValueSize == 1 && UseCodeAlign) { 2998 getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill); 2999 } else { 3000 // FIXME: Target specific behavior about how the "extra" bytes are filled. 3001 getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize, 3002 MaxBytesToFill); 3003 } 3004 3005 return false; 3006 } 3007 3008 /// parseDirectiveFile 3009 /// ::= .file [number] filename 3010 /// ::= .file number directory filename 3011 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) { 3012 // FIXME: I'm not sure what this is. 3013 int64_t FileNumber = -1; 3014 SMLoc FileNumberLoc = getLexer().getLoc(); 3015 if (getLexer().is(AsmToken::Integer)) { 3016 FileNumber = getTok().getIntVal(); 3017 Lex(); 3018 3019 if (FileNumber < 1) 3020 return TokError("file number less than one"); 3021 } 3022 3023 if (getLexer().isNot(AsmToken::String)) 3024 return TokError("unexpected token in '.file' directive"); 3025 3026 // Usually the directory and filename together, otherwise just the directory. 3027 // Allow the strings to have escaped octal character sequence. 3028 std::string Path = getTok().getString(); 3029 if (parseEscapedString(Path)) 3030 return true; 3031 Lex(); 3032 3033 StringRef Directory; 3034 StringRef Filename; 3035 std::string FilenameData; 3036 if (getLexer().is(AsmToken::String)) { 3037 if (FileNumber == -1) 3038 return TokError("explicit path specified, but no file number"); 3039 if (parseEscapedString(FilenameData)) 3040 return true; 3041 Filename = FilenameData; 3042 Directory = Path; 3043 Lex(); 3044 } else { 3045 Filename = Path; 3046 } 3047 3048 if (getLexer().isNot(AsmToken::EndOfStatement)) 3049 return TokError("unexpected token in '.file' directive"); 3050 3051 if (FileNumber == -1) 3052 getStreamer().EmitFileDirective(Filename); 3053 else { 3054 // If there is -g option as well as debug info from directive file, 3055 // we turn off -g option, directly use the existing debug info instead. 3056 if (getContext().getGenDwarfForAssembly()) 3057 getContext().setGenDwarfForAssembly(false); 3058 else if (getStreamer().EmitDwarfFileDirective(FileNumber, Directory, Filename) == 3059 0) 3060 Error(FileNumberLoc, "file number already allocated"); 3061 } 3062 3063 return false; 3064 } 3065 3066 /// parseDirectiveLine 3067 /// ::= .line [number] 3068 bool AsmParser::parseDirectiveLine() { 3069 if (getLexer().isNot(AsmToken::EndOfStatement)) { 3070 if (getLexer().isNot(AsmToken::Integer)) 3071 return TokError("unexpected token in '.line' directive"); 3072 3073 int64_t LineNumber = getTok().getIntVal(); 3074 (void)LineNumber; 3075 Lex(); 3076 3077 // FIXME: Do something with the .line. 3078 } 3079 3080 if (getLexer().isNot(AsmToken::EndOfStatement)) 3081 return TokError("unexpected token in '.line' directive"); 3082 3083 return false; 3084 } 3085 3086 /// parseDirectiveLoc 3087 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end] 3088 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE] 3089 /// The first number is a file number, must have been previously assigned with 3090 /// a .file directive, the second number is the line number and optionally the 3091 /// third number is a column position (zero if not specified). The remaining 3092 /// optional items are .loc sub-directives. 3093 bool AsmParser::parseDirectiveLoc() { 3094 if (getLexer().isNot(AsmToken::Integer)) 3095 return TokError("unexpected token in '.loc' directive"); 3096 int64_t FileNumber = getTok().getIntVal(); 3097 if (FileNumber < 1) 3098 return TokError("file number less than one in '.loc' directive"); 3099 if (!getContext().isValidDwarfFileNumber(FileNumber)) 3100 return TokError("unassigned file number in '.loc' directive"); 3101 Lex(); 3102 3103 int64_t LineNumber = 0; 3104 if (getLexer().is(AsmToken::Integer)) { 3105 LineNumber = getTok().getIntVal(); 3106 if (LineNumber < 0) 3107 return TokError("line number less than zero in '.loc' directive"); 3108 Lex(); 3109 } 3110 3111 int64_t ColumnPos = 0; 3112 if (getLexer().is(AsmToken::Integer)) { 3113 ColumnPos = getTok().getIntVal(); 3114 if (ColumnPos < 0) 3115 return TokError("column position less than zero in '.loc' directive"); 3116 Lex(); 3117 } 3118 3119 unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0; 3120 unsigned Isa = 0; 3121 int64_t Discriminator = 0; 3122 if (getLexer().isNot(AsmToken::EndOfStatement)) { 3123 for (;;) { 3124 if (getLexer().is(AsmToken::EndOfStatement)) 3125 break; 3126 3127 StringRef Name; 3128 SMLoc Loc = getTok().getLoc(); 3129 if (parseIdentifier(Name)) 3130 return TokError("unexpected token in '.loc' directive"); 3131 3132 if (Name == "basic_block") 3133 Flags |= DWARF2_FLAG_BASIC_BLOCK; 3134 else if (Name == "prologue_end") 3135 Flags |= DWARF2_FLAG_PROLOGUE_END; 3136 else if (Name == "epilogue_begin") 3137 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN; 3138 else if (Name == "is_stmt") { 3139 Loc = getTok().getLoc(); 3140 const MCExpr *Value; 3141 if (parseExpression(Value)) 3142 return true; 3143 // The expression must be the constant 0 or 1. 3144 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3145 int Value = MCE->getValue(); 3146 if (Value == 0) 3147 Flags &= ~DWARF2_FLAG_IS_STMT; 3148 else if (Value == 1) 3149 Flags |= DWARF2_FLAG_IS_STMT; 3150 else 3151 return Error(Loc, "is_stmt value not 0 or 1"); 3152 } else { 3153 return Error(Loc, "is_stmt value not the constant value of 0 or 1"); 3154 } 3155 } else if (Name == "isa") { 3156 Loc = getTok().getLoc(); 3157 const MCExpr *Value; 3158 if (parseExpression(Value)) 3159 return true; 3160 // The expression must be a constant greater or equal to 0. 3161 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3162 int Value = MCE->getValue(); 3163 if (Value < 0) 3164 return Error(Loc, "isa number less than zero"); 3165 Isa = Value; 3166 } else { 3167 return Error(Loc, "isa number not a constant value"); 3168 } 3169 } else if (Name == "discriminator") { 3170 if (parseAbsoluteExpression(Discriminator)) 3171 return true; 3172 } else { 3173 return Error(Loc, "unknown sub-directive in '.loc' directive"); 3174 } 3175 3176 if (getLexer().is(AsmToken::EndOfStatement)) 3177 break; 3178 } 3179 } 3180 3181 getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags, 3182 Isa, Discriminator, StringRef()); 3183 3184 return false; 3185 } 3186 3187 /// parseDirectiveStabs 3188 /// ::= .stabs string, number, number, number 3189 bool AsmParser::parseDirectiveStabs() { 3190 return TokError("unsupported directive '.stabs'"); 3191 } 3192 3193 /// parseDirectiveCVFile 3194 /// ::= .cv_file number filename 3195 bool AsmParser::parseDirectiveCVFile() { 3196 SMLoc FileNumberLoc = getLexer().getLoc(); 3197 if (getLexer().isNot(AsmToken::Integer)) 3198 return TokError("expected file number in '.cv_file' directive"); 3199 3200 int64_t FileNumber = getTok().getIntVal(); 3201 Lex(); 3202 3203 if (FileNumber < 1) 3204 return TokError("file number less than one"); 3205 3206 if (getLexer().isNot(AsmToken::String)) 3207 return TokError("unexpected token in '.cv_file' directive"); 3208 3209 // Usually the directory and filename together, otherwise just the directory. 3210 // Allow the strings to have escaped octal character sequence. 3211 std::string Filename; 3212 if (parseEscapedString(Filename)) 3213 return true; 3214 Lex(); 3215 3216 if (getLexer().isNot(AsmToken::EndOfStatement)) 3217 return TokError("unexpected token in '.cv_file' directive"); 3218 3219 if (getStreamer().EmitCVFileDirective(FileNumber, Filename) == 0) 3220 Error(FileNumberLoc, "file number already allocated"); 3221 3222 return false; 3223 } 3224 3225 /// parseDirectiveCVLoc 3226 /// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end] 3227 /// [is_stmt VALUE] 3228 /// The first number is a file number, must have been previously assigned with 3229 /// a .file directive, the second number is the line number and optionally the 3230 /// third number is a column position (zero if not specified). The remaining 3231 /// optional items are .loc sub-directives. 3232 bool AsmParser::parseDirectiveCVLoc() { 3233 if (getLexer().isNot(AsmToken::Integer)) 3234 return TokError("unexpected token in '.cv_loc' directive"); 3235 3236 int64_t FunctionId = getTok().getIntVal(); 3237 if (FunctionId < 0) 3238 return TokError("function id less than zero in '.cv_loc' directive"); 3239 Lex(); 3240 3241 int64_t FileNumber = getTok().getIntVal(); 3242 if (FileNumber < 1) 3243 return TokError("file number less than one in '.cv_loc' directive"); 3244 if (!getContext().isValidCVFileNumber(FileNumber)) 3245 return TokError("unassigned file number in '.cv_loc' directive"); 3246 Lex(); 3247 3248 int64_t LineNumber = 0; 3249 if (getLexer().is(AsmToken::Integer)) { 3250 LineNumber = getTok().getIntVal(); 3251 if (LineNumber < 0) 3252 return TokError("line number less than zero in '.cv_loc' directive"); 3253 Lex(); 3254 } 3255 3256 int64_t ColumnPos = 0; 3257 if (getLexer().is(AsmToken::Integer)) { 3258 ColumnPos = getTok().getIntVal(); 3259 if (ColumnPos < 0) 3260 return TokError("column position less than zero in '.cv_loc' directive"); 3261 Lex(); 3262 } 3263 3264 bool PrologueEnd = false; 3265 uint64_t IsStmt = 0; 3266 while (getLexer().isNot(AsmToken::EndOfStatement)) { 3267 StringRef Name; 3268 SMLoc Loc = getTok().getLoc(); 3269 if (parseIdentifier(Name)) 3270 return TokError("unexpected token in '.cv_loc' directive"); 3271 3272 if (Name == "prologue_end") 3273 PrologueEnd = true; 3274 else if (Name == "is_stmt") { 3275 Loc = getTok().getLoc(); 3276 const MCExpr *Value; 3277 if (parseExpression(Value)) 3278 return true; 3279 // The expression must be the constant 0 or 1. 3280 IsStmt = ~0ULL; 3281 if (const auto *MCE = dyn_cast<MCConstantExpr>(Value)) 3282 IsStmt = MCE->getValue(); 3283 3284 if (IsStmt > 1) 3285 return Error(Loc, "is_stmt value not 0 or 1"); 3286 } else { 3287 return Error(Loc, "unknown sub-directive in '.cv_loc' directive"); 3288 } 3289 } 3290 3291 getStreamer().EmitCVLocDirective(FunctionId, FileNumber, LineNumber, 3292 ColumnPos, PrologueEnd, IsStmt, StringRef()); 3293 return false; 3294 } 3295 3296 /// parseDirectiveCVLinetable 3297 /// ::= .cv_linetable FunctionId, FnStart, FnEnd 3298 bool AsmParser::parseDirectiveCVLinetable() { 3299 int64_t FunctionId = getTok().getIntVal(); 3300 if (FunctionId < 0) 3301 return TokError("function id less than zero in '.cv_linetable' directive"); 3302 Lex(); 3303 3304 if (Lexer.isNot(AsmToken::Comma)) 3305 return TokError("unexpected token in '.cv_linetable' directive"); 3306 Lex(); 3307 3308 SMLoc Loc = getLexer().getLoc(); 3309 StringRef FnStartName; 3310 if (parseIdentifier(FnStartName)) 3311 return Error(Loc, "expected identifier in directive"); 3312 3313 if (Lexer.isNot(AsmToken::Comma)) 3314 return TokError("unexpected token in '.cv_linetable' directive"); 3315 Lex(); 3316 3317 Loc = getLexer().getLoc(); 3318 StringRef FnEndName; 3319 if (parseIdentifier(FnEndName)) 3320 return Error(Loc, "expected identifier in directive"); 3321 3322 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 3323 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 3324 3325 getStreamer().EmitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym); 3326 return false; 3327 } 3328 3329 /// parseDirectiveCVInlineLinetable 3330 /// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd 3331 /// ("contains" SecondaryFunctionId+)? 3332 bool AsmParser::parseDirectiveCVInlineLinetable() { 3333 int64_t PrimaryFunctionId = getTok().getIntVal(); 3334 if (PrimaryFunctionId < 0) 3335 return TokError( 3336 "function id less than zero in '.cv_inline_linetable' directive"); 3337 Lex(); 3338 3339 int64_t SourceFileId = getTok().getIntVal(); 3340 if (SourceFileId <= 0) 3341 return TokError( 3342 "File id less than zero in '.cv_inline_linetable' directive"); 3343 Lex(); 3344 3345 int64_t SourceLineNum = getTok().getIntVal(); 3346 if (SourceLineNum < 0) 3347 return TokError( 3348 "Line number less than zero in '.cv_inline_linetable' directive"); 3349 Lex(); 3350 3351 SMLoc Loc = getLexer().getLoc(); 3352 StringRef FnStartName; 3353 if (parseIdentifier(FnStartName)) 3354 return Error(Loc, "expected identifier in directive"); 3355 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 3356 3357 Loc = getLexer().getLoc(); 3358 StringRef FnEndName; 3359 if (parseIdentifier(FnEndName)) 3360 return Error(Loc, "expected identifier in directive"); 3361 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 3362 3363 SmallVector<unsigned, 8> SecondaryFunctionIds; 3364 if (getLexer().is(AsmToken::Identifier)) { 3365 if (getTok().getIdentifier() != "contains") 3366 return TokError( 3367 "unexpected identifier in '.cv_inline_linetable' directive"); 3368 Lex(); 3369 3370 while (getLexer().isNot(AsmToken::EndOfStatement)) { 3371 int64_t SecondaryFunctionId = getTok().getIntVal(); 3372 if (SecondaryFunctionId < 0) 3373 return TokError( 3374 "function id less than zero in '.cv_inline_linetable' directive"); 3375 Lex(); 3376 3377 SecondaryFunctionIds.push_back(SecondaryFunctionId); 3378 } 3379 } 3380 3381 getStreamer().EmitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId, 3382 SourceLineNum, FnStartSym, 3383 FnEndSym, SecondaryFunctionIds); 3384 return false; 3385 } 3386 3387 /// parseDirectiveCVDefRange 3388 /// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes* 3389 bool AsmParser::parseDirectiveCVDefRange() { 3390 SMLoc Loc; 3391 std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges; 3392 while (getLexer().is(AsmToken::Identifier)) { 3393 Loc = getLexer().getLoc(); 3394 StringRef GapStartName; 3395 if (parseIdentifier(GapStartName)) 3396 return Error(Loc, "expected identifier in directive"); 3397 MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName); 3398 3399 Loc = getLexer().getLoc(); 3400 StringRef GapEndName; 3401 if (parseIdentifier(GapEndName)) 3402 return Error(Loc, "expected identifier in directive"); 3403 MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName); 3404 3405 Ranges.push_back({GapStartSym, GapEndSym}); 3406 } 3407 3408 if (getLexer().isNot(AsmToken::Comma)) 3409 return TokError("unexpected token in directive"); 3410 Lex(); 3411 3412 std::string FixedSizePortion; 3413 if (parseEscapedString(FixedSizePortion)) 3414 return true; 3415 Lex(); 3416 3417 getStreamer().EmitCVDefRangeDirective(Ranges, FixedSizePortion); 3418 return false; 3419 } 3420 3421 /// parseDirectiveCVStringTable 3422 /// ::= .cv_stringtable 3423 bool AsmParser::parseDirectiveCVStringTable() { 3424 getStreamer().EmitCVStringTableDirective(); 3425 return false; 3426 } 3427 3428 /// parseDirectiveCVFileChecksums 3429 /// ::= .cv_filechecksums 3430 bool AsmParser::parseDirectiveCVFileChecksums() { 3431 getStreamer().EmitCVFileChecksumsDirective(); 3432 return false; 3433 } 3434 3435 /// parseDirectiveCFISections 3436 /// ::= .cfi_sections section [, section] 3437 bool AsmParser::parseDirectiveCFISections() { 3438 StringRef Name; 3439 bool EH = false; 3440 bool Debug = false; 3441 3442 if (parseIdentifier(Name)) 3443 return TokError("Expected an identifier"); 3444 3445 if (Name == ".eh_frame") 3446 EH = true; 3447 else if (Name == ".debug_frame") 3448 Debug = true; 3449 3450 if (getLexer().is(AsmToken::Comma)) { 3451 Lex(); 3452 3453 if (parseIdentifier(Name)) 3454 return TokError("Expected an identifier"); 3455 3456 if (Name == ".eh_frame") 3457 EH = true; 3458 else if (Name == ".debug_frame") 3459 Debug = true; 3460 } 3461 3462 getStreamer().EmitCFISections(EH, Debug); 3463 return false; 3464 } 3465 3466 /// parseDirectiveCFIStartProc 3467 /// ::= .cfi_startproc [simple] 3468 bool AsmParser::parseDirectiveCFIStartProc() { 3469 StringRef Simple; 3470 if (getLexer().isNot(AsmToken::EndOfStatement)) 3471 if (parseIdentifier(Simple) || Simple != "simple") 3472 return TokError("unexpected token in .cfi_startproc directive"); 3473 3474 getStreamer().EmitCFIStartProc(!Simple.empty()); 3475 return false; 3476 } 3477 3478 /// parseDirectiveCFIEndProc 3479 /// ::= .cfi_endproc 3480 bool AsmParser::parseDirectiveCFIEndProc() { 3481 getStreamer().EmitCFIEndProc(); 3482 return false; 3483 } 3484 3485 /// \brief parse register name or number. 3486 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register, 3487 SMLoc DirectiveLoc) { 3488 unsigned RegNo; 3489 3490 if (getLexer().isNot(AsmToken::Integer)) { 3491 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc)) 3492 return true; 3493 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true); 3494 } else 3495 return parseAbsoluteExpression(Register); 3496 3497 return false; 3498 } 3499 3500 /// parseDirectiveCFIDefCfa 3501 /// ::= .cfi_def_cfa register, offset 3502 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) { 3503 int64_t Register = 0; 3504 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3505 return true; 3506 3507 if (getLexer().isNot(AsmToken::Comma)) 3508 return TokError("unexpected token in directive"); 3509 Lex(); 3510 3511 int64_t Offset = 0; 3512 if (parseAbsoluteExpression(Offset)) 3513 return true; 3514 3515 getStreamer().EmitCFIDefCfa(Register, Offset); 3516 return false; 3517 } 3518 3519 /// parseDirectiveCFIDefCfaOffset 3520 /// ::= .cfi_def_cfa_offset offset 3521 bool AsmParser::parseDirectiveCFIDefCfaOffset() { 3522 int64_t Offset = 0; 3523 if (parseAbsoluteExpression(Offset)) 3524 return true; 3525 3526 getStreamer().EmitCFIDefCfaOffset(Offset); 3527 return false; 3528 } 3529 3530 /// parseDirectiveCFIRegister 3531 /// ::= .cfi_register register, register 3532 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) { 3533 int64_t Register1 = 0; 3534 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc)) 3535 return true; 3536 3537 if (getLexer().isNot(AsmToken::Comma)) 3538 return TokError("unexpected token in directive"); 3539 Lex(); 3540 3541 int64_t Register2 = 0; 3542 if (parseRegisterOrRegisterNumber(Register2, DirectiveLoc)) 3543 return true; 3544 3545 getStreamer().EmitCFIRegister(Register1, Register2); 3546 return false; 3547 } 3548 3549 /// parseDirectiveCFIWindowSave 3550 /// ::= .cfi_window_save 3551 bool AsmParser::parseDirectiveCFIWindowSave() { 3552 getStreamer().EmitCFIWindowSave(); 3553 return false; 3554 } 3555 3556 /// parseDirectiveCFIAdjustCfaOffset 3557 /// ::= .cfi_adjust_cfa_offset adjustment 3558 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() { 3559 int64_t Adjustment = 0; 3560 if (parseAbsoluteExpression(Adjustment)) 3561 return true; 3562 3563 getStreamer().EmitCFIAdjustCfaOffset(Adjustment); 3564 return false; 3565 } 3566 3567 /// parseDirectiveCFIDefCfaRegister 3568 /// ::= .cfi_def_cfa_register register 3569 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) { 3570 int64_t Register = 0; 3571 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3572 return true; 3573 3574 getStreamer().EmitCFIDefCfaRegister(Register); 3575 return false; 3576 } 3577 3578 /// parseDirectiveCFIOffset 3579 /// ::= .cfi_offset register, offset 3580 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) { 3581 int64_t Register = 0; 3582 int64_t Offset = 0; 3583 3584 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3585 return true; 3586 3587 if (getLexer().isNot(AsmToken::Comma)) 3588 return TokError("unexpected token in directive"); 3589 Lex(); 3590 3591 if (parseAbsoluteExpression(Offset)) 3592 return true; 3593 3594 getStreamer().EmitCFIOffset(Register, Offset); 3595 return false; 3596 } 3597 3598 /// parseDirectiveCFIRelOffset 3599 /// ::= .cfi_rel_offset register, offset 3600 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) { 3601 int64_t Register = 0; 3602 3603 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3604 return true; 3605 3606 if (getLexer().isNot(AsmToken::Comma)) 3607 return TokError("unexpected token in directive"); 3608 Lex(); 3609 3610 int64_t Offset = 0; 3611 if (parseAbsoluteExpression(Offset)) 3612 return true; 3613 3614 getStreamer().EmitCFIRelOffset(Register, Offset); 3615 return false; 3616 } 3617 3618 static bool isValidEncoding(int64_t Encoding) { 3619 if (Encoding & ~0xff) 3620 return false; 3621 3622 if (Encoding == dwarf::DW_EH_PE_omit) 3623 return true; 3624 3625 const unsigned Format = Encoding & 0xf; 3626 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && 3627 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && 3628 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && 3629 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) 3630 return false; 3631 3632 const unsigned Application = Encoding & 0x70; 3633 if (Application != dwarf::DW_EH_PE_absptr && 3634 Application != dwarf::DW_EH_PE_pcrel) 3635 return false; 3636 3637 return true; 3638 } 3639 3640 /// parseDirectiveCFIPersonalityOrLsda 3641 /// IsPersonality true for cfi_personality, false for cfi_lsda 3642 /// ::= .cfi_personality encoding, [symbol_name] 3643 /// ::= .cfi_lsda encoding, [symbol_name] 3644 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) { 3645 int64_t Encoding = 0; 3646 if (parseAbsoluteExpression(Encoding)) 3647 return true; 3648 if (Encoding == dwarf::DW_EH_PE_omit) 3649 return false; 3650 3651 if (!isValidEncoding(Encoding)) 3652 return TokError("unsupported encoding."); 3653 3654 if (getLexer().isNot(AsmToken::Comma)) 3655 return TokError("unexpected token in directive"); 3656 Lex(); 3657 3658 StringRef Name; 3659 if (parseIdentifier(Name)) 3660 return TokError("expected identifier in directive"); 3661 3662 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 3663 3664 if (IsPersonality) 3665 getStreamer().EmitCFIPersonality(Sym, Encoding); 3666 else 3667 getStreamer().EmitCFILsda(Sym, Encoding); 3668 return false; 3669 } 3670 3671 /// parseDirectiveCFIRememberState 3672 /// ::= .cfi_remember_state 3673 bool AsmParser::parseDirectiveCFIRememberState() { 3674 getStreamer().EmitCFIRememberState(); 3675 return false; 3676 } 3677 3678 /// parseDirectiveCFIRestoreState 3679 /// ::= .cfi_remember_state 3680 bool AsmParser::parseDirectiveCFIRestoreState() { 3681 getStreamer().EmitCFIRestoreState(); 3682 return false; 3683 } 3684 3685 /// parseDirectiveCFISameValue 3686 /// ::= .cfi_same_value register 3687 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) { 3688 int64_t Register = 0; 3689 3690 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3691 return true; 3692 3693 getStreamer().EmitCFISameValue(Register); 3694 return false; 3695 } 3696 3697 /// parseDirectiveCFIRestore 3698 /// ::= .cfi_restore register 3699 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) { 3700 int64_t Register = 0; 3701 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3702 return true; 3703 3704 getStreamer().EmitCFIRestore(Register); 3705 return false; 3706 } 3707 3708 /// parseDirectiveCFIEscape 3709 /// ::= .cfi_escape expression[,...] 3710 bool AsmParser::parseDirectiveCFIEscape() { 3711 std::string Values; 3712 int64_t CurrValue; 3713 if (parseAbsoluteExpression(CurrValue)) 3714 return true; 3715 3716 Values.push_back((uint8_t)CurrValue); 3717 3718 while (getLexer().is(AsmToken::Comma)) { 3719 Lex(); 3720 3721 if (parseAbsoluteExpression(CurrValue)) 3722 return true; 3723 3724 Values.push_back((uint8_t)CurrValue); 3725 } 3726 3727 getStreamer().EmitCFIEscape(Values); 3728 return false; 3729 } 3730 3731 /// parseDirectiveCFISignalFrame 3732 /// ::= .cfi_signal_frame 3733 bool AsmParser::parseDirectiveCFISignalFrame() { 3734 if (getLexer().isNot(AsmToken::EndOfStatement)) 3735 return Error(getLexer().getLoc(), 3736 "unexpected token in '.cfi_signal_frame'"); 3737 3738 getStreamer().EmitCFISignalFrame(); 3739 return false; 3740 } 3741 3742 /// parseDirectiveCFIUndefined 3743 /// ::= .cfi_undefined register 3744 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) { 3745 int64_t Register = 0; 3746 3747 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 3748 return true; 3749 3750 getStreamer().EmitCFIUndefined(Register); 3751 return false; 3752 } 3753 3754 /// parseDirectiveMacrosOnOff 3755 /// ::= .macros_on 3756 /// ::= .macros_off 3757 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) { 3758 if (getLexer().isNot(AsmToken::EndOfStatement)) 3759 return Error(getLexer().getLoc(), 3760 "unexpected token in '" + Directive + "' directive"); 3761 3762 setMacrosEnabled(Directive == ".macros_on"); 3763 return false; 3764 } 3765 3766 /// parseDirectiveMacro 3767 /// ::= .macro name[,] [parameters] 3768 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) { 3769 StringRef Name; 3770 if (parseIdentifier(Name)) 3771 return TokError("expected identifier in '.macro' directive"); 3772 3773 if (getLexer().is(AsmToken::Comma)) 3774 Lex(); 3775 3776 MCAsmMacroParameters Parameters; 3777 while (getLexer().isNot(AsmToken::EndOfStatement)) { 3778 3779 if (!Parameters.empty() && Parameters.back().Vararg) 3780 return Error(Lexer.getLoc(), 3781 "Vararg parameter '" + Parameters.back().Name + 3782 "' should be last one in the list of parameters."); 3783 3784 MCAsmMacroParameter Parameter; 3785 if (parseIdentifier(Parameter.Name)) 3786 return TokError("expected identifier in '.macro' directive"); 3787 3788 if (Lexer.is(AsmToken::Colon)) { 3789 Lex(); // consume ':' 3790 3791 SMLoc QualLoc; 3792 StringRef Qualifier; 3793 3794 QualLoc = Lexer.getLoc(); 3795 if (parseIdentifier(Qualifier)) 3796 return Error(QualLoc, "missing parameter qualifier for " 3797 "'" + Parameter.Name + "' in macro '" + Name + "'"); 3798 3799 if (Qualifier == "req") 3800 Parameter.Required = true; 3801 else if (Qualifier == "vararg") 3802 Parameter.Vararg = true; 3803 else 3804 return Error(QualLoc, Qualifier + " is not a valid parameter qualifier " 3805 "for '" + Parameter.Name + "' in macro '" + Name + "'"); 3806 } 3807 3808 if (getLexer().is(AsmToken::Equal)) { 3809 Lex(); 3810 3811 SMLoc ParamLoc; 3812 3813 ParamLoc = Lexer.getLoc(); 3814 if (parseMacroArgument(Parameter.Value, /*Vararg=*/false )) 3815 return true; 3816 3817 if (Parameter.Required) 3818 Warning(ParamLoc, "pointless default value for required parameter " 3819 "'" + Parameter.Name + "' in macro '" + Name + "'"); 3820 } 3821 3822 Parameters.push_back(std::move(Parameter)); 3823 3824 if (getLexer().is(AsmToken::Comma)) 3825 Lex(); 3826 } 3827 3828 // Eat just the end of statement. 3829 Lexer.Lex(); 3830 3831 // Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors 3832 AsmToken EndToken, StartToken = getTok(); 3833 unsigned MacroDepth = 0; 3834 // Lex the macro definition. 3835 for (;;) { 3836 // Ignore Lexing errors in macros. 3837 while (Lexer.is(AsmToken::Error)) { 3838 Lexer.Lex(); 3839 } 3840 3841 // Check whether we have reached the end of the file. 3842 if (getLexer().is(AsmToken::Eof)) 3843 return Error(DirectiveLoc, "no matching '.endmacro' in definition"); 3844 3845 // Otherwise, check whether we have reach the .endmacro. 3846 if (getLexer().is(AsmToken::Identifier)) { 3847 if (getTok().getIdentifier() == ".endm" || 3848 getTok().getIdentifier() == ".endmacro") { 3849 if (MacroDepth == 0) { // Outermost macro. 3850 EndToken = getTok(); 3851 Lexer.Lex(); 3852 if (getLexer().isNot(AsmToken::EndOfStatement)) 3853 return TokError("unexpected token in '" + EndToken.getIdentifier() + 3854 "' directive"); 3855 break; 3856 } else { 3857 // Otherwise we just found the end of an inner macro. 3858 --MacroDepth; 3859 } 3860 } else if (getTok().getIdentifier() == ".macro") { 3861 // We allow nested macros. Those aren't instantiated until the outermost 3862 // macro is expanded so just ignore them for now. 3863 ++MacroDepth; 3864 } 3865 } 3866 3867 // Otherwise, scan til the end of the statement. 3868 eatToEndOfStatement(); 3869 } 3870 3871 if (lookupMacro(Name)) { 3872 return Error(DirectiveLoc, "macro '" + Name + "' is already defined"); 3873 } 3874 3875 const char *BodyStart = StartToken.getLoc().getPointer(); 3876 const char *BodyEnd = EndToken.getLoc().getPointer(); 3877 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 3878 checkForBadMacro(DirectiveLoc, Name, Body, Parameters); 3879 defineMacro(Name, MCAsmMacro(Name, Body, std::move(Parameters))); 3880 return false; 3881 } 3882 3883 /// checkForBadMacro 3884 /// 3885 /// With the support added for named parameters there may be code out there that 3886 /// is transitioning from positional parameters. In versions of gas that did 3887 /// not support named parameters they would be ignored on the macro definition. 3888 /// But to support both styles of parameters this is not possible so if a macro 3889 /// definition has named parameters but does not use them and has what appears 3890 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a 3891 /// warning that the positional parameter found in body which have no effect. 3892 /// Hoping the developer will either remove the named parameters from the macro 3893 /// definition so the positional parameters get used if that was what was 3894 /// intended or change the macro to use the named parameters. It is possible 3895 /// this warning will trigger when the none of the named parameters are used 3896 /// and the strings like $1 are infact to simply to be passed trough unchanged. 3897 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, 3898 StringRef Body, 3899 ArrayRef<MCAsmMacroParameter> Parameters) { 3900 // If this macro is not defined with named parameters the warning we are 3901 // checking for here doesn't apply. 3902 unsigned NParameters = Parameters.size(); 3903 if (NParameters == 0) 3904 return; 3905 3906 bool NamedParametersFound = false; 3907 bool PositionalParametersFound = false; 3908 3909 // Look at the body of the macro for use of both the named parameters and what 3910 // are likely to be positional parameters. This is what expandMacro() is 3911 // doing when it finds the parameters in the body. 3912 while (!Body.empty()) { 3913 // Scan for the next possible parameter. 3914 std::size_t End = Body.size(), Pos = 0; 3915 for (; Pos != End; ++Pos) { 3916 // Check for a substitution or escape. 3917 // This macro is defined with parameters, look for \foo, \bar, etc. 3918 if (Body[Pos] == '\\' && Pos + 1 != End) 3919 break; 3920 3921 // This macro should have parameters, but look for $0, $1, ..., $n too. 3922 if (Body[Pos] != '$' || Pos + 1 == End) 3923 continue; 3924 char Next = Body[Pos + 1]; 3925 if (Next == '$' || Next == 'n' || 3926 isdigit(static_cast<unsigned char>(Next))) 3927 break; 3928 } 3929 3930 // Check if we reached the end. 3931 if (Pos == End) 3932 break; 3933 3934 if (Body[Pos] == '$') { 3935 switch (Body[Pos + 1]) { 3936 // $$ => $ 3937 case '$': 3938 break; 3939 3940 // $n => number of arguments 3941 case 'n': 3942 PositionalParametersFound = true; 3943 break; 3944 3945 // $[0-9] => argument 3946 default: { 3947 PositionalParametersFound = true; 3948 break; 3949 } 3950 } 3951 Pos += 2; 3952 } else { 3953 unsigned I = Pos + 1; 3954 while (isIdentifierChar(Body[I]) && I + 1 != End) 3955 ++I; 3956 3957 const char *Begin = Body.data() + Pos + 1; 3958 StringRef Argument(Begin, I - (Pos + 1)); 3959 unsigned Index = 0; 3960 for (; Index < NParameters; ++Index) 3961 if (Parameters[Index].Name == Argument) 3962 break; 3963 3964 if (Index == NParameters) { 3965 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 3966 Pos += 3; 3967 else { 3968 Pos = I; 3969 } 3970 } else { 3971 NamedParametersFound = true; 3972 Pos += 1 + Argument.size(); 3973 } 3974 } 3975 // Update the scan point. 3976 Body = Body.substr(Pos); 3977 } 3978 3979 if (!NamedParametersFound && PositionalParametersFound) 3980 Warning(DirectiveLoc, "macro defined with named parameters which are not " 3981 "used in macro body, possible positional parameter " 3982 "found in body which will have no effect"); 3983 } 3984 3985 /// parseDirectiveExitMacro 3986 /// ::= .exitm 3987 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) { 3988 if (getLexer().isNot(AsmToken::EndOfStatement)) 3989 return TokError("unexpected token in '" + Directive + "' directive"); 3990 3991 if (!isInsideMacroInstantiation()) 3992 return TokError("unexpected '" + Directive + "' in file, " 3993 "no current macro definition"); 3994 3995 // Exit all conditionals that are active in the current macro. 3996 while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) { 3997 TheCondState = TheCondStack.back(); 3998 TheCondStack.pop_back(); 3999 } 4000 4001 handleMacroExit(); 4002 return false; 4003 } 4004 4005 /// parseDirectiveEndMacro 4006 /// ::= .endm 4007 /// ::= .endmacro 4008 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) { 4009 if (getLexer().isNot(AsmToken::EndOfStatement)) 4010 return TokError("unexpected token in '" + Directive + "' directive"); 4011 4012 // If we are inside a macro instantiation, terminate the current 4013 // instantiation. 4014 if (isInsideMacroInstantiation()) { 4015 handleMacroExit(); 4016 return false; 4017 } 4018 4019 // Otherwise, this .endmacro is a stray entry in the file; well formed 4020 // .endmacro directives are handled during the macro definition parsing. 4021 return TokError("unexpected '" + Directive + "' in file, " 4022 "no current macro definition"); 4023 } 4024 4025 /// parseDirectivePurgeMacro 4026 /// ::= .purgem 4027 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) { 4028 StringRef Name; 4029 if (parseIdentifier(Name)) 4030 return TokError("expected identifier in '.purgem' directive"); 4031 4032 if (getLexer().isNot(AsmToken::EndOfStatement)) 4033 return TokError("unexpected token in '.purgem' directive"); 4034 4035 if (!lookupMacro(Name)) 4036 return Error(DirectiveLoc, "macro '" + Name + "' is not defined"); 4037 4038 undefineMacro(Name); 4039 return false; 4040 } 4041 4042 /// parseDirectiveBundleAlignMode 4043 /// ::= {.bundle_align_mode} expression 4044 bool AsmParser::parseDirectiveBundleAlignMode() { 4045 checkForValidSection(); 4046 4047 // Expect a single argument: an expression that evaluates to a constant 4048 // in the inclusive range 0-30. 4049 SMLoc ExprLoc = getLexer().getLoc(); 4050 int64_t AlignSizePow2; 4051 if (parseAbsoluteExpression(AlignSizePow2)) 4052 return true; 4053 else if (getLexer().isNot(AsmToken::EndOfStatement)) 4054 return TokError("unexpected token after expression in" 4055 " '.bundle_align_mode' directive"); 4056 else if (AlignSizePow2 < 0 || AlignSizePow2 > 30) 4057 return Error(ExprLoc, 4058 "invalid bundle alignment size (expected between 0 and 30)"); 4059 4060 Lex(); 4061 4062 // Because of AlignSizePow2's verified range we can safely truncate it to 4063 // unsigned. 4064 getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2)); 4065 return false; 4066 } 4067 4068 /// parseDirectiveBundleLock 4069 /// ::= {.bundle_lock} [align_to_end] 4070 bool AsmParser::parseDirectiveBundleLock() { 4071 checkForValidSection(); 4072 bool AlignToEnd = false; 4073 4074 if (getLexer().isNot(AsmToken::EndOfStatement)) { 4075 StringRef Option; 4076 SMLoc Loc = getTok().getLoc(); 4077 const char *kInvalidOptionError = 4078 "invalid option for '.bundle_lock' directive"; 4079 4080 if (parseIdentifier(Option)) 4081 return Error(Loc, kInvalidOptionError); 4082 4083 if (Option != "align_to_end") 4084 return Error(Loc, kInvalidOptionError); 4085 else if (getLexer().isNot(AsmToken::EndOfStatement)) 4086 return Error(Loc, 4087 "unexpected token after '.bundle_lock' directive option"); 4088 AlignToEnd = true; 4089 } 4090 4091 Lex(); 4092 4093 getStreamer().EmitBundleLock(AlignToEnd); 4094 return false; 4095 } 4096 4097 /// parseDirectiveBundleLock 4098 /// ::= {.bundle_lock} 4099 bool AsmParser::parseDirectiveBundleUnlock() { 4100 checkForValidSection(); 4101 4102 if (getLexer().isNot(AsmToken::EndOfStatement)) 4103 return TokError("unexpected token in '.bundle_unlock' directive"); 4104 Lex(); 4105 4106 getStreamer().EmitBundleUnlock(); 4107 return false; 4108 } 4109 4110 /// parseDirectiveSpace 4111 /// ::= (.skip | .space) expression [ , expression ] 4112 bool AsmParser::parseDirectiveSpace(StringRef IDVal) { 4113 checkForValidSection(); 4114 4115 SMLoc NumBytesLoc = Lexer.getLoc(); 4116 const MCExpr *NumBytes; 4117 if (parseExpression(NumBytes)) 4118 return true; 4119 4120 int64_t FillExpr = 0; 4121 if (getLexer().isNot(AsmToken::EndOfStatement)) { 4122 if (getLexer().isNot(AsmToken::Comma)) 4123 return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); 4124 Lex(); 4125 4126 if (parseAbsoluteExpression(FillExpr)) 4127 return true; 4128 4129 if (getLexer().isNot(AsmToken::EndOfStatement)) 4130 return TokError("unexpected token in '" + Twine(IDVal) + "' directive"); 4131 } 4132 4133 Lex(); 4134 4135 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. 4136 getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc); 4137 4138 return false; 4139 } 4140 4141 /// parseDirectiveLEB128 4142 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ] 4143 bool AsmParser::parseDirectiveLEB128(bool Signed) { 4144 checkForValidSection(); 4145 const MCExpr *Value; 4146 4147 for (;;) { 4148 if (parseExpression(Value)) 4149 return true; 4150 4151 if (Signed) 4152 getStreamer().EmitSLEB128Value(Value); 4153 else 4154 getStreamer().EmitULEB128Value(Value); 4155 4156 if (getLexer().is(AsmToken::EndOfStatement)) 4157 break; 4158 4159 if (getLexer().isNot(AsmToken::Comma)) 4160 return TokError("unexpected token in directive"); 4161 Lex(); 4162 } 4163 4164 return false; 4165 } 4166 4167 /// parseDirectiveSymbolAttribute 4168 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ] 4169 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) { 4170 if (getLexer().isNot(AsmToken::EndOfStatement)) { 4171 for (;;) { 4172 StringRef Name; 4173 SMLoc Loc = getTok().getLoc(); 4174 4175 if (parseIdentifier(Name)) 4176 return Error(Loc, "expected identifier in directive"); 4177 4178 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4179 4180 // Assembler local symbols don't make any sense here. Complain loudly. 4181 if (Sym->isTemporary()) 4182 return Error(Loc, "non-local symbol required in directive"); 4183 4184 if (!getStreamer().EmitSymbolAttribute(Sym, Attr)) 4185 return Error(Loc, "unable to emit symbol attribute"); 4186 4187 if (getLexer().is(AsmToken::EndOfStatement)) 4188 break; 4189 4190 if (getLexer().isNot(AsmToken::Comma)) 4191 return TokError("unexpected token in directive"); 4192 Lex(); 4193 } 4194 } 4195 4196 Lex(); 4197 return false; 4198 } 4199 4200 /// parseDirectiveComm 4201 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ] 4202 bool AsmParser::parseDirectiveComm(bool IsLocal) { 4203 checkForValidSection(); 4204 4205 SMLoc IDLoc = getLexer().getLoc(); 4206 StringRef Name; 4207 if (parseIdentifier(Name)) 4208 return TokError("expected identifier in directive"); 4209 4210 // Handle the identifier as the key symbol. 4211 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4212 4213 if (getLexer().isNot(AsmToken::Comma)) 4214 return TokError("unexpected token in directive"); 4215 Lex(); 4216 4217 int64_t Size; 4218 SMLoc SizeLoc = getLexer().getLoc(); 4219 if (parseAbsoluteExpression(Size)) 4220 return true; 4221 4222 int64_t Pow2Alignment = 0; 4223 SMLoc Pow2AlignmentLoc; 4224 if (getLexer().is(AsmToken::Comma)) { 4225 Lex(); 4226 Pow2AlignmentLoc = getLexer().getLoc(); 4227 if (parseAbsoluteExpression(Pow2Alignment)) 4228 return true; 4229 4230 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType(); 4231 if (IsLocal && LCOMM == LCOMM::NoAlignment) 4232 return Error(Pow2AlignmentLoc, "alignment not supported on this target"); 4233 4234 // If this target takes alignments in bytes (not log) validate and convert. 4235 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) || 4236 (IsLocal && LCOMM == LCOMM::ByteAlignment)) { 4237 if (!isPowerOf2_64(Pow2Alignment)) 4238 return Error(Pow2AlignmentLoc, "alignment must be a power of 2"); 4239 Pow2Alignment = Log2_64(Pow2Alignment); 4240 } 4241 } 4242 4243 if (getLexer().isNot(AsmToken::EndOfStatement)) 4244 return TokError("unexpected token in '.comm' or '.lcomm' directive"); 4245 4246 Lex(); 4247 4248 // NOTE: a size of zero for a .comm should create a undefined symbol 4249 // but a size of .lcomm creates a bss symbol of size zero. 4250 if (Size < 0) 4251 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't " 4252 "be less than zero"); 4253 4254 // NOTE: The alignment in the directive is a power of 2 value, the assembler 4255 // may internally end up wanting an alignment in bytes. 4256 // FIXME: Diagnose overflow. 4257 if (Pow2Alignment < 0) 4258 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive " 4259 "alignment, can't be less than zero"); 4260 4261 if (!Sym->isUndefined()) 4262 return Error(IDLoc, "invalid symbol redefinition"); 4263 4264 // Create the Symbol as a common or local common with Size and Pow2Alignment 4265 if (IsLocal) { 4266 getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment); 4267 return false; 4268 } 4269 4270 getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment); 4271 return false; 4272 } 4273 4274 /// parseDirectiveAbort 4275 /// ::= .abort [... message ...] 4276 bool AsmParser::parseDirectiveAbort() { 4277 // FIXME: Use loc from directive. 4278 SMLoc Loc = getLexer().getLoc(); 4279 4280 StringRef Str = parseStringToEndOfStatement(); 4281 if (getLexer().isNot(AsmToken::EndOfStatement)) 4282 return TokError("unexpected token in '.abort' directive"); 4283 4284 Lex(); 4285 4286 if (Str.empty()) 4287 Error(Loc, ".abort detected. Assembly stopping."); 4288 else 4289 Error(Loc, ".abort '" + Str + "' detected. Assembly stopping."); 4290 // FIXME: Actually abort assembly here. 4291 4292 return false; 4293 } 4294 4295 /// parseDirectiveInclude 4296 /// ::= .include "filename" 4297 bool AsmParser::parseDirectiveInclude() { 4298 if (getLexer().isNot(AsmToken::String)) 4299 return TokError("expected string in '.include' directive"); 4300 4301 // Allow the strings to have escaped octal character sequence. 4302 std::string Filename; 4303 if (parseEscapedString(Filename)) 4304 return true; 4305 SMLoc IncludeLoc = getLexer().getLoc(); 4306 Lex(); 4307 4308 if (getLexer().isNot(AsmToken::EndOfStatement)) 4309 return TokError("unexpected token in '.include' directive"); 4310 4311 // Attempt to switch the lexer to the included file before consuming the end 4312 // of statement to avoid losing it when we switch. 4313 if (enterIncludeFile(Filename)) { 4314 Error(IncludeLoc, "Could not find include file '" + Filename + "'"); 4315 return true; 4316 } 4317 4318 return false; 4319 } 4320 4321 /// parseDirectiveIncbin 4322 /// ::= .incbin "filename" 4323 bool AsmParser::parseDirectiveIncbin() { 4324 if (getLexer().isNot(AsmToken::String)) 4325 return TokError("expected string in '.incbin' directive"); 4326 4327 // Allow the strings to have escaped octal character sequence. 4328 std::string Filename; 4329 if (parseEscapedString(Filename)) 4330 return true; 4331 SMLoc IncbinLoc = getLexer().getLoc(); 4332 Lex(); 4333 4334 if (getLexer().isNot(AsmToken::EndOfStatement)) 4335 return TokError("unexpected token in '.incbin' directive"); 4336 4337 // Attempt to process the included file. 4338 if (processIncbinFile(Filename)) { 4339 Error(IncbinLoc, "Could not find incbin file '" + Filename + "'"); 4340 return true; 4341 } 4342 4343 return false; 4344 } 4345 4346 /// parseDirectiveIf 4347 /// ::= .if{,eq,ge,gt,le,lt,ne} expression 4348 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) { 4349 TheCondStack.push_back(TheCondState); 4350 TheCondState.TheCond = AsmCond::IfCond; 4351 if (TheCondState.Ignore) { 4352 eatToEndOfStatement(); 4353 } else { 4354 int64_t ExprValue; 4355 if (parseAbsoluteExpression(ExprValue)) 4356 return true; 4357 4358 if (getLexer().isNot(AsmToken::EndOfStatement)) 4359 return TokError("unexpected token in '.if' directive"); 4360 4361 Lex(); 4362 4363 switch (DirKind) { 4364 default: 4365 llvm_unreachable("unsupported directive"); 4366 case DK_IF: 4367 case DK_IFNE: 4368 break; 4369 case DK_IFEQ: 4370 ExprValue = ExprValue == 0; 4371 break; 4372 case DK_IFGE: 4373 ExprValue = ExprValue >= 0; 4374 break; 4375 case DK_IFGT: 4376 ExprValue = ExprValue > 0; 4377 break; 4378 case DK_IFLE: 4379 ExprValue = ExprValue <= 0; 4380 break; 4381 case DK_IFLT: 4382 ExprValue = ExprValue < 0; 4383 break; 4384 } 4385 4386 TheCondState.CondMet = ExprValue; 4387 TheCondState.Ignore = !TheCondState.CondMet; 4388 } 4389 4390 return false; 4391 } 4392 4393 /// parseDirectiveIfb 4394 /// ::= .ifb string 4395 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) { 4396 TheCondStack.push_back(TheCondState); 4397 TheCondState.TheCond = AsmCond::IfCond; 4398 4399 if (TheCondState.Ignore) { 4400 eatToEndOfStatement(); 4401 } else { 4402 StringRef Str = parseStringToEndOfStatement(); 4403 4404 if (getLexer().isNot(AsmToken::EndOfStatement)) 4405 return TokError("unexpected token in '.ifb' directive"); 4406 4407 Lex(); 4408 4409 TheCondState.CondMet = ExpectBlank == Str.empty(); 4410 TheCondState.Ignore = !TheCondState.CondMet; 4411 } 4412 4413 return false; 4414 } 4415 4416 /// parseDirectiveIfc 4417 /// ::= .ifc string1, string2 4418 /// ::= .ifnc string1, string2 4419 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) { 4420 TheCondStack.push_back(TheCondState); 4421 TheCondState.TheCond = AsmCond::IfCond; 4422 4423 if (TheCondState.Ignore) { 4424 eatToEndOfStatement(); 4425 } else { 4426 StringRef Str1 = parseStringToComma(); 4427 4428 if (getLexer().isNot(AsmToken::Comma)) 4429 return TokError("unexpected token in '.ifc' directive"); 4430 4431 Lex(); 4432 4433 StringRef Str2 = parseStringToEndOfStatement(); 4434 4435 if (getLexer().isNot(AsmToken::EndOfStatement)) 4436 return TokError("unexpected token in '.ifc' directive"); 4437 4438 Lex(); 4439 4440 TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim()); 4441 TheCondState.Ignore = !TheCondState.CondMet; 4442 } 4443 4444 return false; 4445 } 4446 4447 /// parseDirectiveIfeqs 4448 /// ::= .ifeqs string1, string2 4449 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) { 4450 if (Lexer.isNot(AsmToken::String)) { 4451 if (ExpectEqual) 4452 TokError("expected string parameter for '.ifeqs' directive"); 4453 else 4454 TokError("expected string parameter for '.ifnes' directive"); 4455 eatToEndOfStatement(); 4456 return true; 4457 } 4458 4459 StringRef String1 = getTok().getStringContents(); 4460 Lex(); 4461 4462 if (Lexer.isNot(AsmToken::Comma)) { 4463 if (ExpectEqual) 4464 TokError("expected comma after first string for '.ifeqs' directive"); 4465 else 4466 TokError("expected comma after first string for '.ifnes' directive"); 4467 eatToEndOfStatement(); 4468 return true; 4469 } 4470 4471 Lex(); 4472 4473 if (Lexer.isNot(AsmToken::String)) { 4474 if (ExpectEqual) 4475 TokError("expected string parameter for '.ifeqs' directive"); 4476 else 4477 TokError("expected string parameter for '.ifnes' directive"); 4478 eatToEndOfStatement(); 4479 return true; 4480 } 4481 4482 StringRef String2 = getTok().getStringContents(); 4483 Lex(); 4484 4485 TheCondStack.push_back(TheCondState); 4486 TheCondState.TheCond = AsmCond::IfCond; 4487 TheCondState.CondMet = ExpectEqual == (String1 == String2); 4488 TheCondState.Ignore = !TheCondState.CondMet; 4489 4490 return false; 4491 } 4492 4493 /// parseDirectiveIfdef 4494 /// ::= .ifdef symbol 4495 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) { 4496 StringRef Name; 4497 TheCondStack.push_back(TheCondState); 4498 TheCondState.TheCond = AsmCond::IfCond; 4499 4500 if (TheCondState.Ignore) { 4501 eatToEndOfStatement(); 4502 } else { 4503 if (parseIdentifier(Name)) 4504 return TokError("expected identifier after '.ifdef'"); 4505 4506 Lex(); 4507 4508 MCSymbol *Sym = getContext().lookupSymbol(Name); 4509 4510 if (expect_defined) 4511 TheCondState.CondMet = (Sym && !Sym->isUndefined()); 4512 else 4513 TheCondState.CondMet = (!Sym || Sym->isUndefined()); 4514 TheCondState.Ignore = !TheCondState.CondMet; 4515 } 4516 4517 return false; 4518 } 4519 4520 /// parseDirectiveElseIf 4521 /// ::= .elseif expression 4522 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) { 4523 if (TheCondState.TheCond != AsmCond::IfCond && 4524 TheCondState.TheCond != AsmCond::ElseIfCond) 4525 Error(DirectiveLoc, "Encountered a .elseif that doesn't follow a .if or " 4526 " an .elseif"); 4527 TheCondState.TheCond = AsmCond::ElseIfCond; 4528 4529 bool LastIgnoreState = false; 4530 if (!TheCondStack.empty()) 4531 LastIgnoreState = TheCondStack.back().Ignore; 4532 if (LastIgnoreState || TheCondState.CondMet) { 4533 TheCondState.Ignore = true; 4534 eatToEndOfStatement(); 4535 } else { 4536 int64_t ExprValue; 4537 if (parseAbsoluteExpression(ExprValue)) 4538 return true; 4539 4540 if (getLexer().isNot(AsmToken::EndOfStatement)) 4541 return TokError("unexpected token in '.elseif' directive"); 4542 4543 Lex(); 4544 TheCondState.CondMet = ExprValue; 4545 TheCondState.Ignore = !TheCondState.CondMet; 4546 } 4547 4548 return false; 4549 } 4550 4551 /// parseDirectiveElse 4552 /// ::= .else 4553 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) { 4554 if (getLexer().isNot(AsmToken::EndOfStatement)) 4555 return TokError("unexpected token in '.else' directive"); 4556 4557 Lex(); 4558 4559 if (TheCondState.TheCond != AsmCond::IfCond && 4560 TheCondState.TheCond != AsmCond::ElseIfCond) 4561 Error(DirectiveLoc, "Encountered a .else that doesn't follow a .if or an " 4562 ".elseif"); 4563 TheCondState.TheCond = AsmCond::ElseCond; 4564 bool LastIgnoreState = false; 4565 if (!TheCondStack.empty()) 4566 LastIgnoreState = TheCondStack.back().Ignore; 4567 if (LastIgnoreState || TheCondState.CondMet) 4568 TheCondState.Ignore = true; 4569 else 4570 TheCondState.Ignore = false; 4571 4572 return false; 4573 } 4574 4575 /// parseDirectiveEnd 4576 /// ::= .end 4577 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) { 4578 if (getLexer().isNot(AsmToken::EndOfStatement)) 4579 return TokError("unexpected token in '.end' directive"); 4580 4581 Lex(); 4582 4583 while (Lexer.isNot(AsmToken::Eof)) 4584 Lex(); 4585 4586 return false; 4587 } 4588 4589 /// parseDirectiveError 4590 /// ::= .err 4591 /// ::= .error [string] 4592 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) { 4593 if (!TheCondStack.empty()) { 4594 if (TheCondStack.back().Ignore) { 4595 eatToEndOfStatement(); 4596 return false; 4597 } 4598 } 4599 4600 if (!WithMessage) 4601 return Error(L, ".err encountered"); 4602 4603 StringRef Message = ".error directive invoked in source file"; 4604 if (Lexer.isNot(AsmToken::EndOfStatement)) { 4605 if (Lexer.isNot(AsmToken::String)) { 4606 TokError(".error argument must be a string"); 4607 eatToEndOfStatement(); 4608 return true; 4609 } 4610 4611 Message = getTok().getStringContents(); 4612 Lex(); 4613 } 4614 4615 Error(L, Message); 4616 return true; 4617 } 4618 4619 /// parseDirectiveWarning 4620 /// ::= .warning [string] 4621 bool AsmParser::parseDirectiveWarning(SMLoc L) { 4622 if (!TheCondStack.empty()) { 4623 if (TheCondStack.back().Ignore) { 4624 eatToEndOfStatement(); 4625 return false; 4626 } 4627 } 4628 4629 StringRef Message = ".warning directive invoked in source file"; 4630 if (Lexer.isNot(AsmToken::EndOfStatement)) { 4631 if (Lexer.isNot(AsmToken::String)) { 4632 TokError(".warning argument must be a string"); 4633 eatToEndOfStatement(); 4634 return true; 4635 } 4636 4637 Message = getTok().getStringContents(); 4638 Lex(); 4639 } 4640 4641 Warning(L, Message); 4642 return false; 4643 } 4644 4645 /// parseDirectiveEndIf 4646 /// ::= .endif 4647 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) { 4648 if (getLexer().isNot(AsmToken::EndOfStatement)) 4649 return TokError("unexpected token in '.endif' directive"); 4650 4651 Lex(); 4652 4653 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty()) 4654 Error(DirectiveLoc, "Encountered a .endif that doesn't follow a .if or " 4655 ".else"); 4656 if (!TheCondStack.empty()) { 4657 TheCondState = TheCondStack.back(); 4658 TheCondStack.pop_back(); 4659 } 4660 4661 return false; 4662 } 4663 4664 void AsmParser::initializeDirectiveKindMap() { 4665 DirectiveKindMap[".set"] = DK_SET; 4666 DirectiveKindMap[".equ"] = DK_EQU; 4667 DirectiveKindMap[".equiv"] = DK_EQUIV; 4668 DirectiveKindMap[".ascii"] = DK_ASCII; 4669 DirectiveKindMap[".asciz"] = DK_ASCIZ; 4670 DirectiveKindMap[".string"] = DK_STRING; 4671 DirectiveKindMap[".byte"] = DK_BYTE; 4672 DirectiveKindMap[".short"] = DK_SHORT; 4673 DirectiveKindMap[".value"] = DK_VALUE; 4674 DirectiveKindMap[".2byte"] = DK_2BYTE; 4675 DirectiveKindMap[".long"] = DK_LONG; 4676 DirectiveKindMap[".int"] = DK_INT; 4677 DirectiveKindMap[".4byte"] = DK_4BYTE; 4678 DirectiveKindMap[".quad"] = DK_QUAD; 4679 DirectiveKindMap[".8byte"] = DK_8BYTE; 4680 DirectiveKindMap[".octa"] = DK_OCTA; 4681 DirectiveKindMap[".single"] = DK_SINGLE; 4682 DirectiveKindMap[".float"] = DK_FLOAT; 4683 DirectiveKindMap[".double"] = DK_DOUBLE; 4684 DirectiveKindMap[".align"] = DK_ALIGN; 4685 DirectiveKindMap[".align32"] = DK_ALIGN32; 4686 DirectiveKindMap[".balign"] = DK_BALIGN; 4687 DirectiveKindMap[".balignw"] = DK_BALIGNW; 4688 DirectiveKindMap[".balignl"] = DK_BALIGNL; 4689 DirectiveKindMap[".p2align"] = DK_P2ALIGN; 4690 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW; 4691 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL; 4692 DirectiveKindMap[".org"] = DK_ORG; 4693 DirectiveKindMap[".fill"] = DK_FILL; 4694 DirectiveKindMap[".zero"] = DK_ZERO; 4695 DirectiveKindMap[".extern"] = DK_EXTERN; 4696 DirectiveKindMap[".globl"] = DK_GLOBL; 4697 DirectiveKindMap[".global"] = DK_GLOBAL; 4698 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE; 4699 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP; 4700 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER; 4701 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN; 4702 DirectiveKindMap[".reference"] = DK_REFERENCE; 4703 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION; 4704 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE; 4705 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN; 4706 DirectiveKindMap[".comm"] = DK_COMM; 4707 DirectiveKindMap[".common"] = DK_COMMON; 4708 DirectiveKindMap[".lcomm"] = DK_LCOMM; 4709 DirectiveKindMap[".abort"] = DK_ABORT; 4710 DirectiveKindMap[".include"] = DK_INCLUDE; 4711 DirectiveKindMap[".incbin"] = DK_INCBIN; 4712 DirectiveKindMap[".code16"] = DK_CODE16; 4713 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC; 4714 DirectiveKindMap[".rept"] = DK_REPT; 4715 DirectiveKindMap[".rep"] = DK_REPT; 4716 DirectiveKindMap[".irp"] = DK_IRP; 4717 DirectiveKindMap[".irpc"] = DK_IRPC; 4718 DirectiveKindMap[".endr"] = DK_ENDR; 4719 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE; 4720 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK; 4721 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK; 4722 DirectiveKindMap[".if"] = DK_IF; 4723 DirectiveKindMap[".ifeq"] = DK_IFEQ; 4724 DirectiveKindMap[".ifge"] = DK_IFGE; 4725 DirectiveKindMap[".ifgt"] = DK_IFGT; 4726 DirectiveKindMap[".ifle"] = DK_IFLE; 4727 DirectiveKindMap[".iflt"] = DK_IFLT; 4728 DirectiveKindMap[".ifne"] = DK_IFNE; 4729 DirectiveKindMap[".ifb"] = DK_IFB; 4730 DirectiveKindMap[".ifnb"] = DK_IFNB; 4731 DirectiveKindMap[".ifc"] = DK_IFC; 4732 DirectiveKindMap[".ifeqs"] = DK_IFEQS; 4733 DirectiveKindMap[".ifnc"] = DK_IFNC; 4734 DirectiveKindMap[".ifnes"] = DK_IFNES; 4735 DirectiveKindMap[".ifdef"] = DK_IFDEF; 4736 DirectiveKindMap[".ifndef"] = DK_IFNDEF; 4737 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF; 4738 DirectiveKindMap[".elseif"] = DK_ELSEIF; 4739 DirectiveKindMap[".else"] = DK_ELSE; 4740 DirectiveKindMap[".end"] = DK_END; 4741 DirectiveKindMap[".endif"] = DK_ENDIF; 4742 DirectiveKindMap[".skip"] = DK_SKIP; 4743 DirectiveKindMap[".space"] = DK_SPACE; 4744 DirectiveKindMap[".file"] = DK_FILE; 4745 DirectiveKindMap[".line"] = DK_LINE; 4746 DirectiveKindMap[".loc"] = DK_LOC; 4747 DirectiveKindMap[".stabs"] = DK_STABS; 4748 DirectiveKindMap[".cv_file"] = DK_CV_FILE; 4749 DirectiveKindMap[".cv_loc"] = DK_CV_LOC; 4750 DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE; 4751 DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE; 4752 DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE; 4753 DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE; 4754 DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS; 4755 DirectiveKindMap[".sleb128"] = DK_SLEB128; 4756 DirectiveKindMap[".uleb128"] = DK_ULEB128; 4757 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS; 4758 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC; 4759 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC; 4760 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA; 4761 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET; 4762 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET; 4763 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER; 4764 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET; 4765 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET; 4766 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY; 4767 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA; 4768 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE; 4769 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE; 4770 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE; 4771 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE; 4772 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE; 4773 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME; 4774 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED; 4775 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER; 4776 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE; 4777 DirectiveKindMap[".macros_on"] = DK_MACROS_ON; 4778 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF; 4779 DirectiveKindMap[".macro"] = DK_MACRO; 4780 DirectiveKindMap[".exitm"] = DK_EXITM; 4781 DirectiveKindMap[".endm"] = DK_ENDM; 4782 DirectiveKindMap[".endmacro"] = DK_ENDMACRO; 4783 DirectiveKindMap[".purgem"] = DK_PURGEM; 4784 DirectiveKindMap[".err"] = DK_ERR; 4785 DirectiveKindMap[".error"] = DK_ERROR; 4786 DirectiveKindMap[".warning"] = DK_WARNING; 4787 DirectiveKindMap[".reloc"] = DK_RELOC; 4788 } 4789 4790 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) { 4791 AsmToken EndToken, StartToken = getTok(); 4792 4793 unsigned NestLevel = 0; 4794 for (;;) { 4795 // Check whether we have reached the end of the file. 4796 if (getLexer().is(AsmToken::Eof)) { 4797 Error(DirectiveLoc, "no matching '.endr' in definition"); 4798 return nullptr; 4799 } 4800 4801 if (Lexer.is(AsmToken::Identifier) && 4802 (getTok().getIdentifier() == ".rept" || 4803 getTok().getIdentifier() == ".irp" || 4804 getTok().getIdentifier() == ".irpc")) { 4805 ++NestLevel; 4806 } 4807 4808 // Otherwise, check whether we have reached the .endr. 4809 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") { 4810 if (NestLevel == 0) { 4811 EndToken = getTok(); 4812 Lex(); 4813 if (Lexer.isNot(AsmToken::EndOfStatement)) { 4814 TokError("unexpected token in '.endr' directive"); 4815 return nullptr; 4816 } 4817 break; 4818 } 4819 --NestLevel; 4820 } 4821 4822 // Otherwise, scan till the end of the statement. 4823 eatToEndOfStatement(); 4824 } 4825 4826 const char *BodyStart = StartToken.getLoc().getPointer(); 4827 const char *BodyEnd = EndToken.getLoc().getPointer(); 4828 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 4829 4830 // We Are Anonymous. 4831 MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters()); 4832 return &MacroLikeBodies.back(); 4833 } 4834 4835 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 4836 raw_svector_ostream &OS) { 4837 OS << ".endr\n"; 4838 4839 std::unique_ptr<MemoryBuffer> Instantiation = 4840 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 4841 4842 // Create the macro instantiation object and add to the current macro 4843 // instantiation stack. 4844 MacroInstantiation *MI = new MacroInstantiation( 4845 DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()); 4846 ActiveMacros.push_back(MI); 4847 4848 // Jump to the macro instantiation and prime the lexer. 4849 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 4850 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 4851 Lex(); 4852 } 4853 4854 /// parseDirectiveRept 4855 /// ::= .rep | .rept count 4856 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) { 4857 const MCExpr *CountExpr; 4858 SMLoc CountLoc = getTok().getLoc(); 4859 if (parseExpression(CountExpr)) 4860 return true; 4861 4862 int64_t Count; 4863 if (!CountExpr->evaluateAsAbsolute(Count)) { 4864 eatToEndOfStatement(); 4865 return Error(CountLoc, "unexpected token in '" + Dir + "' directive"); 4866 } 4867 4868 if (Count < 0) 4869 return Error(CountLoc, "Count is negative"); 4870 4871 if (Lexer.isNot(AsmToken::EndOfStatement)) 4872 return TokError("unexpected token in '" + Dir + "' directive"); 4873 4874 // Eat the end of statement. 4875 Lex(); 4876 4877 // Lex the rept definition. 4878 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 4879 if (!M) 4880 return true; 4881 4882 // Macro instantiation is lexical, unfortunately. We construct a new buffer 4883 // to hold the macro body with substitutions. 4884 SmallString<256> Buf; 4885 raw_svector_ostream OS(Buf); 4886 while (Count--) { 4887 // Note that the AtPseudoVariable is disabled for instantiations of .rep(t). 4888 if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc())) 4889 return true; 4890 } 4891 instantiateMacroLikeBody(M, DirectiveLoc, OS); 4892 4893 return false; 4894 } 4895 4896 /// parseDirectiveIrp 4897 /// ::= .irp symbol,values 4898 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) { 4899 MCAsmMacroParameter Parameter; 4900 4901 if (parseIdentifier(Parameter.Name)) 4902 return TokError("expected identifier in '.irp' directive"); 4903 4904 if (Lexer.isNot(AsmToken::Comma)) 4905 return TokError("expected comma in '.irp' directive"); 4906 4907 Lex(); 4908 4909 MCAsmMacroArguments A; 4910 if (parseMacroArguments(nullptr, A)) 4911 return true; 4912 4913 // Eat the end of statement. 4914 Lex(); 4915 4916 // Lex the irp definition. 4917 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 4918 if (!M) 4919 return true; 4920 4921 // Macro instantiation is lexical, unfortunately. We construct a new buffer 4922 // to hold the macro body with substitutions. 4923 SmallString<256> Buf; 4924 raw_svector_ostream OS(Buf); 4925 4926 for (const MCAsmMacroArgument &Arg : A) { 4927 // Note that the AtPseudoVariable is enabled for instantiations of .irp. 4928 // This is undocumented, but GAS seems to support it. 4929 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) 4930 return true; 4931 } 4932 4933 instantiateMacroLikeBody(M, DirectiveLoc, OS); 4934 4935 return false; 4936 } 4937 4938 /// parseDirectiveIrpc 4939 /// ::= .irpc symbol,values 4940 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) { 4941 MCAsmMacroParameter Parameter; 4942 4943 if (parseIdentifier(Parameter.Name)) 4944 return TokError("expected identifier in '.irpc' directive"); 4945 4946 if (Lexer.isNot(AsmToken::Comma)) 4947 return TokError("expected comma in '.irpc' directive"); 4948 4949 Lex(); 4950 4951 MCAsmMacroArguments A; 4952 if (parseMacroArguments(nullptr, A)) 4953 return true; 4954 4955 if (A.size() != 1 || A.front().size() != 1) 4956 return TokError("unexpected token in '.irpc' directive"); 4957 4958 // Eat the end of statement. 4959 Lex(); 4960 4961 // Lex the irpc definition. 4962 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 4963 if (!M) 4964 return true; 4965 4966 // Macro instantiation is lexical, unfortunately. We construct a new buffer 4967 // to hold the macro body with substitutions. 4968 SmallString<256> Buf; 4969 raw_svector_ostream OS(Buf); 4970 4971 StringRef Values = A.front().front().getString(); 4972 for (std::size_t I = 0, End = Values.size(); I != End; ++I) { 4973 MCAsmMacroArgument Arg; 4974 Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1)); 4975 4976 // Note that the AtPseudoVariable is enabled for instantiations of .irpc. 4977 // This is undocumented, but GAS seems to support it. 4978 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) 4979 return true; 4980 } 4981 4982 instantiateMacroLikeBody(M, DirectiveLoc, OS); 4983 4984 return false; 4985 } 4986 4987 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) { 4988 if (ActiveMacros.empty()) 4989 return TokError("unmatched '.endr' directive"); 4990 4991 // The only .repl that should get here are the ones created by 4992 // instantiateMacroLikeBody. 4993 assert(getLexer().is(AsmToken::EndOfStatement)); 4994 4995 handleMacroExit(); 4996 return false; 4997 } 4998 4999 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info, 5000 size_t Len) { 5001 const MCExpr *Value; 5002 SMLoc ExprLoc = getLexer().getLoc(); 5003 if (parseExpression(Value)) 5004 return true; 5005 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5006 if (!MCE) 5007 return Error(ExprLoc, "unexpected expression in _emit"); 5008 uint64_t IntValue = MCE->getValue(); 5009 if (!isUInt<8>(IntValue) && !isInt<8>(IntValue)) 5010 return Error(ExprLoc, "literal value out of range for directive"); 5011 5012 Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len); 5013 return false; 5014 } 5015 5016 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) { 5017 const MCExpr *Value; 5018 SMLoc ExprLoc = getLexer().getLoc(); 5019 if (parseExpression(Value)) 5020 return true; 5021 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5022 if (!MCE) 5023 return Error(ExprLoc, "unexpected expression in align"); 5024 uint64_t IntValue = MCE->getValue(); 5025 if (!isPowerOf2_64(IntValue)) 5026 return Error(ExprLoc, "literal value not a power of two greater then zero"); 5027 5028 Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue)); 5029 return false; 5030 } 5031 5032 // We are comparing pointers, but the pointers are relative to a single string. 5033 // Thus, this should always be deterministic. 5034 static int rewritesSort(const AsmRewrite *AsmRewriteA, 5035 const AsmRewrite *AsmRewriteB) { 5036 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer()) 5037 return -1; 5038 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer()) 5039 return 1; 5040 5041 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output 5042 // rewrite to the same location. Make sure the SizeDirective rewrite is 5043 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This 5044 // ensures the sort algorithm is stable. 5045 if (AsmRewritePrecedence[AsmRewriteA->Kind] > 5046 AsmRewritePrecedence[AsmRewriteB->Kind]) 5047 return -1; 5048 5049 if (AsmRewritePrecedence[AsmRewriteA->Kind] < 5050 AsmRewritePrecedence[AsmRewriteB->Kind]) 5051 return 1; 5052 llvm_unreachable("Unstable rewrite sort."); 5053 } 5054 5055 bool AsmParser::parseMSInlineAsm( 5056 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs, 5057 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool> > &OpDecls, 5058 SmallVectorImpl<std::string> &Constraints, 5059 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII, 5060 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) { 5061 SmallVector<void *, 4> InputDecls; 5062 SmallVector<void *, 4> OutputDecls; 5063 SmallVector<bool, 4> InputDeclsAddressOf; 5064 SmallVector<bool, 4> OutputDeclsAddressOf; 5065 SmallVector<std::string, 4> InputConstraints; 5066 SmallVector<std::string, 4> OutputConstraints; 5067 SmallVector<unsigned, 4> ClobberRegs; 5068 5069 SmallVector<AsmRewrite, 4> AsmStrRewrites; 5070 5071 // Prime the lexer. 5072 Lex(); 5073 5074 // While we have input, parse each statement. 5075 unsigned InputIdx = 0; 5076 unsigned OutputIdx = 0; 5077 while (getLexer().isNot(AsmToken::Eof)) { 5078 // Parse curly braces marking block start/end 5079 if (parseCurlyBlockScope(AsmStrRewrites)) 5080 continue; 5081 5082 ParseStatementInfo Info(&AsmStrRewrites); 5083 if (parseStatement(Info, &SI)) 5084 return true; 5085 5086 if (Info.ParseError) 5087 return true; 5088 5089 if (Info.Opcode == ~0U) 5090 continue; 5091 5092 const MCInstrDesc &Desc = MII->get(Info.Opcode); 5093 5094 // Build the list of clobbers, outputs and inputs. 5095 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) { 5096 MCParsedAsmOperand &Operand = *Info.ParsedOperands[i]; 5097 5098 // Immediate. 5099 if (Operand.isImm()) 5100 continue; 5101 5102 // Register operand. 5103 if (Operand.isReg() && !Operand.needAddressOf() && 5104 !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) { 5105 unsigned NumDefs = Desc.getNumDefs(); 5106 // Clobber. 5107 if (NumDefs && Operand.getMCOperandNum() < NumDefs) 5108 ClobberRegs.push_back(Operand.getReg()); 5109 continue; 5110 } 5111 5112 // Expr/Input or Output. 5113 StringRef SymName = Operand.getSymName(); 5114 if (SymName.empty()) 5115 continue; 5116 5117 void *OpDecl = Operand.getOpDecl(); 5118 if (!OpDecl) 5119 continue; 5120 5121 bool isOutput = (i == 1) && Desc.mayStore(); 5122 SMLoc Start = SMLoc::getFromPointer(SymName.data()); 5123 if (isOutput) { 5124 ++InputIdx; 5125 OutputDecls.push_back(OpDecl); 5126 OutputDeclsAddressOf.push_back(Operand.needAddressOf()); 5127 OutputConstraints.push_back(("=" + Operand.getConstraint()).str()); 5128 AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size()); 5129 } else { 5130 InputDecls.push_back(OpDecl); 5131 InputDeclsAddressOf.push_back(Operand.needAddressOf()); 5132 InputConstraints.push_back(Operand.getConstraint().str()); 5133 AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size()); 5134 } 5135 } 5136 5137 // Consider implicit defs to be clobbers. Think of cpuid and push. 5138 ArrayRef<MCPhysReg> ImpDefs(Desc.getImplicitDefs(), 5139 Desc.getNumImplicitDefs()); 5140 ClobberRegs.insert(ClobberRegs.end(), ImpDefs.begin(), ImpDefs.end()); 5141 } 5142 5143 // Set the number of Outputs and Inputs. 5144 NumOutputs = OutputDecls.size(); 5145 NumInputs = InputDecls.size(); 5146 5147 // Set the unique clobbers. 5148 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end()); 5149 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()), 5150 ClobberRegs.end()); 5151 Clobbers.assign(ClobberRegs.size(), std::string()); 5152 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) { 5153 raw_string_ostream OS(Clobbers[I]); 5154 IP->printRegName(OS, ClobberRegs[I]); 5155 } 5156 5157 // Merge the various outputs and inputs. Output are expected first. 5158 if (NumOutputs || NumInputs) { 5159 unsigned NumExprs = NumOutputs + NumInputs; 5160 OpDecls.resize(NumExprs); 5161 Constraints.resize(NumExprs); 5162 for (unsigned i = 0; i < NumOutputs; ++i) { 5163 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]); 5164 Constraints[i] = OutputConstraints[i]; 5165 } 5166 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) { 5167 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]); 5168 Constraints[j] = InputConstraints[i]; 5169 } 5170 } 5171 5172 // Build the IR assembly string. 5173 std::string AsmStringIR; 5174 raw_string_ostream OS(AsmStringIR); 5175 StringRef ASMString = 5176 SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer(); 5177 const char *AsmStart = ASMString.begin(); 5178 const char *AsmEnd = ASMString.end(); 5179 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort); 5180 for (const AsmRewrite &AR : AsmStrRewrites) { 5181 AsmRewriteKind Kind = AR.Kind; 5182 if (Kind == AOK_Delete) 5183 continue; 5184 5185 const char *Loc = AR.Loc.getPointer(); 5186 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!"); 5187 5188 // Emit everything up to the immediate/expression. 5189 if (unsigned Len = Loc - AsmStart) 5190 OS << StringRef(AsmStart, Len); 5191 5192 // Skip the original expression. 5193 if (Kind == AOK_Skip) { 5194 AsmStart = Loc + AR.Len; 5195 continue; 5196 } 5197 5198 unsigned AdditionalSkip = 0; 5199 // Rewrite expressions in $N notation. 5200 switch (Kind) { 5201 default: 5202 break; 5203 case AOK_Imm: 5204 OS << "$$" << AR.Val; 5205 break; 5206 case AOK_ImmPrefix: 5207 OS << "$$"; 5208 break; 5209 case AOK_Label: 5210 OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label; 5211 break; 5212 case AOK_Input: 5213 OS << '$' << InputIdx++; 5214 break; 5215 case AOK_Output: 5216 OS << '$' << OutputIdx++; 5217 break; 5218 case AOK_SizeDirective: 5219 switch (AR.Val) { 5220 default: break; 5221 case 8: OS << "byte ptr "; break; 5222 case 16: OS << "word ptr "; break; 5223 case 32: OS << "dword ptr "; break; 5224 case 64: OS << "qword ptr "; break; 5225 case 80: OS << "xword ptr "; break; 5226 case 128: OS << "xmmword ptr "; break; 5227 case 256: OS << "ymmword ptr "; break; 5228 } 5229 break; 5230 case AOK_Emit: 5231 OS << ".byte"; 5232 break; 5233 case AOK_Align: { 5234 // MS alignment directives are measured in bytes. If the native assembler 5235 // measures alignment in bytes, we can pass it straight through. 5236 OS << ".align"; 5237 if (getContext().getAsmInfo()->getAlignmentIsInBytes()) 5238 break; 5239 5240 // Alignment is in log2 form, so print that instead and skip the original 5241 // immediate. 5242 unsigned Val = AR.Val; 5243 OS << ' ' << Val; 5244 assert(Val < 10 && "Expected alignment less then 2^10."); 5245 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4; 5246 break; 5247 } 5248 case AOK_EVEN: 5249 OS << ".even"; 5250 break; 5251 case AOK_DotOperator: 5252 // Insert the dot if the user omitted it. 5253 OS.flush(); 5254 if (AsmStringIR.back() != '.') 5255 OS << '.'; 5256 OS << AR.Val; 5257 break; 5258 case AOK_EndOfStatement: 5259 OS << "\n\t"; 5260 break; 5261 } 5262 5263 // Skip the original expression. 5264 AsmStart = Loc + AR.Len + AdditionalSkip; 5265 } 5266 5267 // Emit the remainder of the asm string. 5268 if (AsmStart != AsmEnd) 5269 OS << StringRef(AsmStart, AsmEnd - AsmStart); 5270 5271 AsmString = OS.str(); 5272 return false; 5273 } 5274 5275 namespace llvm { 5276 namespace MCParserUtils { 5277 5278 /// Returns whether the given symbol is used anywhere in the given expression, 5279 /// or subexpressions. 5280 static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) { 5281 switch (Value->getKind()) { 5282 case MCExpr::Binary: { 5283 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value); 5284 return isSymbolUsedInExpression(Sym, BE->getLHS()) || 5285 isSymbolUsedInExpression(Sym, BE->getRHS()); 5286 } 5287 case MCExpr::Target: 5288 case MCExpr::Constant: 5289 return false; 5290 case MCExpr::SymbolRef: { 5291 const MCSymbol &S = 5292 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol(); 5293 if (S.isVariable()) 5294 return isSymbolUsedInExpression(Sym, S.getVariableValue()); 5295 return &S == Sym; 5296 } 5297 case MCExpr::Unary: 5298 return isSymbolUsedInExpression( 5299 Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr()); 5300 } 5301 5302 llvm_unreachable("Unknown expr kind!"); 5303 } 5304 5305 bool parseAssignmentExpression(StringRef Name, bool allow_redef, 5306 MCAsmParser &Parser, MCSymbol *&Sym, 5307 const MCExpr *&Value) { 5308 5309 // FIXME: Use better location, we should use proper tokens. 5310 SMLoc EqualLoc = Parser.getTok().getLoc(); 5311 5312 if (Parser.parseExpression(Value)) { 5313 Parser.TokError("missing expression"); 5314 Parser.eatToEndOfStatement(); 5315 return true; 5316 } 5317 5318 // Note: we don't count b as used in "a = b". This is to allow 5319 // a = b 5320 // b = c 5321 5322 if (Parser.getTok().isNot(AsmToken::EndOfStatement)) 5323 return Parser.TokError("unexpected token in assignment"); 5324 5325 // Eat the end of statement marker. 5326 Parser.Lex(); 5327 5328 // Validate that the LHS is allowed to be a variable (either it has not been 5329 // used as a symbol, or it is an absolute symbol). 5330 Sym = Parser.getContext().lookupSymbol(Name); 5331 if (Sym) { 5332 // Diagnose assignment to a label. 5333 // 5334 // FIXME: Diagnostics. Note the location of the definition as a label. 5335 // FIXME: Diagnose assignment to protected identifier (e.g., register name). 5336 if (isSymbolUsedInExpression(Sym, Value)) 5337 return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'"); 5338 else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() && 5339 !Sym->isVariable()) 5340 ; // Allow redefinitions of undefined symbols only used in directives. 5341 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef) 5342 ; // Allow redefinitions of variables that haven't yet been used. 5343 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef)) 5344 return Parser.Error(EqualLoc, "redefinition of '" + Name + "'"); 5345 else if (!Sym->isVariable()) 5346 return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'"); 5347 else if (!isa<MCConstantExpr>(Sym->getVariableValue())) 5348 return Parser.Error(EqualLoc, 5349 "invalid reassignment of non-absolute variable '" + 5350 Name + "'"); 5351 } else if (Name == ".") { 5352 Parser.getStreamer().emitValueToOffset(Value, 0); 5353 return false; 5354 } else 5355 Sym = Parser.getContext().getOrCreateSymbol(Name); 5356 5357 Sym->setRedefinable(allow_redef); 5358 5359 return false; 5360 } 5361 5362 } // namespace MCParserUtils 5363 } // namespace llvm 5364 5365 /// \brief Create an MCAsmParser instance. 5366 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C, 5367 MCStreamer &Out, const MCAsmInfo &MAI) { 5368 return new AsmParser(SM, C, Out, MAI); 5369 } 5370