1 //===- AsmParser.cpp - Parser for Assembly Files --------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This class implements a parser for assembly files similar to gas syntax. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/ADT/APFloat.h" 14 #include "llvm/ADT/APInt.h" 15 #include "llvm/ADT/ArrayRef.h" 16 #include "llvm/ADT/None.h" 17 #include "llvm/ADT/STLExtras.h" 18 #include "llvm/ADT/SmallString.h" 19 #include "llvm/ADT/SmallVector.h" 20 #include "llvm/ADT/StringExtras.h" 21 #include "llvm/ADT/StringMap.h" 22 #include "llvm/ADT/StringRef.h" 23 #include "llvm/ADT/Twine.h" 24 #include "llvm/BinaryFormat/Dwarf.h" 25 #include "llvm/DebugInfo/CodeView/SymbolRecord.h" 26 #include "llvm/MC/MCAsmInfo.h" 27 #include "llvm/MC/MCCodeView.h" 28 #include "llvm/MC/MCContext.h" 29 #include "llvm/MC/MCDirectives.h" 30 #include "llvm/MC/MCDwarf.h" 31 #include "llvm/MC/MCExpr.h" 32 #include "llvm/MC/MCInstPrinter.h" 33 #include "llvm/MC/MCInstrDesc.h" 34 #include "llvm/MC/MCInstrInfo.h" 35 #include "llvm/MC/MCObjectFileInfo.h" 36 #include "llvm/MC/MCParser/AsmCond.h" 37 #include "llvm/MC/MCParser/AsmLexer.h" 38 #include "llvm/MC/MCParser/MCAsmLexer.h" 39 #include "llvm/MC/MCParser/MCAsmParser.h" 40 #include "llvm/MC/MCParser/MCAsmParserExtension.h" 41 #include "llvm/MC/MCParser/MCAsmParserUtils.h" 42 #include "llvm/MC/MCParser/MCParsedAsmOperand.h" 43 #include "llvm/MC/MCParser/MCTargetAsmParser.h" 44 #include "llvm/MC/MCRegisterInfo.h" 45 #include "llvm/MC/MCSection.h" 46 #include "llvm/MC/MCStreamer.h" 47 #include "llvm/MC/MCSymbol.h" 48 #include "llvm/MC/MCTargetOptions.h" 49 #include "llvm/MC/MCValue.h" 50 #include "llvm/Support/Casting.h" 51 #include "llvm/Support/CommandLine.h" 52 #include "llvm/Support/ErrorHandling.h" 53 #include "llvm/Support/MD5.h" 54 #include "llvm/Support/MathExtras.h" 55 #include "llvm/Support/MemoryBuffer.h" 56 #include "llvm/Support/SMLoc.h" 57 #include "llvm/Support/SourceMgr.h" 58 #include "llvm/Support/raw_ostream.h" 59 #include <algorithm> 60 #include <cassert> 61 #include <cctype> 62 #include <climits> 63 #include <cstddef> 64 #include <cstdint> 65 #include <deque> 66 #include <memory> 67 #include <sstream> 68 #include <string> 69 #include <tuple> 70 #include <utility> 71 #include <vector> 72 73 using namespace llvm; 74 75 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() = default; 76 77 extern cl::opt<unsigned> AsmMacroMaxNestingDepth; 78 79 namespace { 80 81 /// Helper types for tracking macro definitions. 82 typedef std::vector<AsmToken> MCAsmMacroArgument; 83 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments; 84 85 /// Helper class for storing information about an active macro 86 /// instantiation. 87 struct MacroInstantiation { 88 /// The location of the instantiation. 89 SMLoc InstantiationLoc; 90 91 /// The buffer where parsing should resume upon instantiation completion. 92 unsigned ExitBuffer; 93 94 /// The location where parsing should resume upon instantiation completion. 95 SMLoc ExitLoc; 96 97 /// The depth of TheCondStack at the start of the instantiation. 98 size_t CondStackDepth; 99 }; 100 101 struct ParseStatementInfo { 102 /// The parsed operands from the last parsed statement. 103 SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands; 104 105 /// The opcode from the last parsed instruction. 106 unsigned Opcode = ~0U; 107 108 /// Was there an error parsing the inline assembly? 109 bool ParseError = false; 110 111 SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr; 112 113 ParseStatementInfo() = delete; 114 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites) 115 : AsmRewrites(rewrites) {} 116 }; 117 118 /// The concrete assembly parser instance. 119 class AsmParser : public MCAsmParser { 120 private: 121 AsmLexer Lexer; 122 MCContext &Ctx; 123 MCStreamer &Out; 124 const MCAsmInfo &MAI; 125 SourceMgr &SrcMgr; 126 SourceMgr::DiagHandlerTy SavedDiagHandler; 127 void *SavedDiagContext; 128 std::unique_ptr<MCAsmParserExtension> PlatformParser; 129 SMLoc StartTokLoc; 130 131 /// This is the current buffer index we're lexing from as managed by the 132 /// SourceMgr object. 133 unsigned CurBuffer; 134 135 AsmCond TheCondState; 136 std::vector<AsmCond> TheCondStack; 137 138 /// maps directive names to handler methods in parser 139 /// extensions. Extensions register themselves in this map by calling 140 /// addDirectiveHandler. 141 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap; 142 143 /// Stack of active macro instantiations. 144 std::vector<MacroInstantiation*> ActiveMacros; 145 146 /// List of bodies of anonymous macros. 147 std::deque<MCAsmMacro> MacroLikeBodies; 148 149 /// Boolean tracking whether macro substitution is enabled. 150 unsigned MacrosEnabledFlag : 1; 151 152 /// Keeps track of how many .macro's have been instantiated. 153 unsigned NumOfMacroInstantiations; 154 155 /// The values from the last parsed cpp hash file line comment if any. 156 struct CppHashInfoTy { 157 StringRef Filename; 158 int64_t LineNumber; 159 SMLoc Loc; 160 unsigned Buf; 161 CppHashInfoTy() : Filename(), LineNumber(0), Loc(), Buf(0) {} 162 }; 163 CppHashInfoTy CppHashInfo; 164 165 /// The filename from the first cpp hash file line comment, if any. 166 StringRef FirstCppHashFilename; 167 168 /// List of forward directional labels for diagnosis at the end. 169 SmallVector<std::tuple<SMLoc, CppHashInfoTy, MCSymbol *>, 4> DirLabels; 170 171 /// AssemblerDialect. ~OU means unset value and use value provided by MAI. 172 unsigned AssemblerDialect = ~0U; 173 174 /// is Darwin compatibility enabled? 175 bool IsDarwin = false; 176 177 /// Are we parsing ms-style inline assembly? 178 bool ParsingMSInlineAsm = false; 179 180 /// Did we already inform the user about inconsistent MD5 usage? 181 bool ReportedInconsistentMD5 = false; 182 183 // Is alt macro mode enabled. 184 bool AltMacroMode = false; 185 186 public: 187 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 188 const MCAsmInfo &MAI, unsigned CB); 189 AsmParser(const AsmParser &) = delete; 190 AsmParser &operator=(const AsmParser &) = delete; 191 ~AsmParser() override; 192 193 bool Run(bool NoInitialTextSection, bool NoFinalize = false) override; 194 195 void addDirectiveHandler(StringRef Directive, 196 ExtensionDirectiveHandler Handler) override { 197 ExtensionDirectiveMap[Directive] = Handler; 198 } 199 200 void addAliasForDirective(StringRef Directive, StringRef Alias) override { 201 DirectiveKindMap[Directive.lower()] = DirectiveKindMap[Alias.lower()]; 202 } 203 204 /// @name MCAsmParser Interface 205 /// { 206 207 SourceMgr &getSourceManager() override { return SrcMgr; } 208 MCAsmLexer &getLexer() override { return Lexer; } 209 MCContext &getContext() override { return Ctx; } 210 MCStreamer &getStreamer() override { return Out; } 211 212 CodeViewContext &getCVContext() { return Ctx.getCVContext(); } 213 214 unsigned getAssemblerDialect() override { 215 if (AssemblerDialect == ~0U) 216 return MAI.getAssemblerDialect(); 217 else 218 return AssemblerDialect; 219 } 220 void setAssemblerDialect(unsigned i) override { 221 AssemblerDialect = i; 222 } 223 224 void Note(SMLoc L, const Twine &Msg, SMRange Range = None) override; 225 bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) override; 226 bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) override; 227 228 const AsmToken &Lex() override; 229 230 void setParsingMSInlineAsm(bool V) override { 231 ParsingMSInlineAsm = V; 232 // When parsing MS inline asm, we must lex 0b1101 and 0ABCH as binary and 233 // hex integer literals. 234 Lexer.setLexMasmIntegers(V); 235 } 236 bool isParsingMSInlineAsm() override { return ParsingMSInlineAsm; } 237 238 bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString, 239 unsigned &NumOutputs, unsigned &NumInputs, 240 SmallVectorImpl<std::pair<void *,bool>> &OpDecls, 241 SmallVectorImpl<std::string> &Constraints, 242 SmallVectorImpl<std::string> &Clobbers, 243 const MCInstrInfo *MII, const MCInstPrinter *IP, 244 MCAsmParserSemaCallback &SI) override; 245 246 bool parseExpression(const MCExpr *&Res); 247 bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 248 bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc, 249 AsmTypeInfo *TypeInfo) override; 250 bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 251 bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 252 SMLoc &EndLoc) override; 253 bool parseAbsoluteExpression(int64_t &Res) override; 254 255 /// Parse a floating point expression using the float \p Semantics 256 /// and set \p Res to the value. 257 bool parseRealValue(const fltSemantics &Semantics, APInt &Res); 258 259 /// Parse an identifier or string (as a quoted identifier) 260 /// and set \p Res to the identifier contents. 261 bool parseIdentifier(StringRef &Res) override; 262 void eatToEndOfStatement() override; 263 264 bool checkForValidSection() override; 265 266 /// } 267 268 private: 269 bool parseStatement(ParseStatementInfo &Info, 270 MCAsmParserSemaCallback *SI); 271 bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites); 272 bool parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo = true); 273 274 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body, 275 ArrayRef<MCAsmMacroParameter> Parameters); 276 bool expandMacro(raw_svector_ostream &OS, StringRef Body, 277 ArrayRef<MCAsmMacroParameter> Parameters, 278 ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable, 279 SMLoc L); 280 281 /// Are macros enabled in the parser? 282 bool areMacrosEnabled() {return MacrosEnabledFlag;} 283 284 /// Control a flag in the parser that enables or disables macros. 285 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;} 286 287 /// Are we inside a macro instantiation? 288 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();} 289 290 /// Handle entry to macro instantiation. 291 /// 292 /// \param M The macro. 293 /// \param NameLoc Instantiation location. 294 bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc); 295 296 /// Handle exit from macro instantiation. 297 void handleMacroExit(); 298 299 /// Extract AsmTokens for a macro argument. 300 bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg); 301 302 /// Parse all macro arguments for a given macro. 303 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A); 304 305 void printMacroInstantiations(); 306 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg, 307 SMRange Range = None) const { 308 ArrayRef<SMRange> Ranges(Range); 309 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges); 310 } 311 static void DiagHandler(const SMDiagnostic &Diag, void *Context); 312 313 /// Should we emit DWARF describing this assembler source? (Returns false if 314 /// the source has .file directives, which means we don't want to generate 315 /// info describing the assembler source itself.) 316 bool enabledGenDwarfForAssembly(); 317 318 /// Enter the specified file. This returns true on failure. 319 bool enterIncludeFile(const std::string &Filename); 320 321 /// Process the specified file for the .incbin directive. 322 /// This returns true on failure. 323 bool processIncbinFile(const std::string &Filename, int64_t Skip = 0, 324 const MCExpr *Count = nullptr, SMLoc Loc = SMLoc()); 325 326 /// Reset the current lexer position to that given by \p Loc. The 327 /// current token is not set; clients should ensure Lex() is called 328 /// subsequently. 329 /// 330 /// \param InBuffer If not 0, should be the known buffer id that contains the 331 /// location. 332 void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0); 333 334 /// Parse up to the end of statement and a return the contents from the 335 /// current token until the end of the statement; the current token on exit 336 /// will be either the EndOfStatement or EOF. 337 StringRef parseStringToEndOfStatement() override; 338 339 /// Parse until the end of a statement or a comma is encountered, 340 /// return the contents from the current token up to the end or comma. 341 StringRef parseStringToComma(); 342 343 bool parseAssignment(StringRef Name, bool allow_redef, 344 bool NoDeadStrip = false); 345 346 unsigned getBinOpPrecedence(AsmToken::TokenKind K, 347 MCBinaryExpr::Opcode &Kind); 348 349 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); 350 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); 351 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); 352 353 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); 354 355 bool parseCVFunctionId(int64_t &FunctionId, StringRef DirectiveName); 356 bool parseCVFileId(int64_t &FileId, StringRef DirectiveName); 357 358 // Generic (target and platform independent) directive parsing. 359 enum DirectiveKind { 360 DK_NO_DIRECTIVE, // Placeholder 361 DK_SET, 362 DK_EQU, 363 DK_EQUIV, 364 DK_ASCII, 365 DK_ASCIZ, 366 DK_STRING, 367 DK_BYTE, 368 DK_SHORT, 369 DK_RELOC, 370 DK_VALUE, 371 DK_2BYTE, 372 DK_LONG, 373 DK_INT, 374 DK_4BYTE, 375 DK_QUAD, 376 DK_8BYTE, 377 DK_OCTA, 378 DK_DC, 379 DK_DC_A, 380 DK_DC_B, 381 DK_DC_D, 382 DK_DC_L, 383 DK_DC_S, 384 DK_DC_W, 385 DK_DC_X, 386 DK_DCB, 387 DK_DCB_B, 388 DK_DCB_D, 389 DK_DCB_L, 390 DK_DCB_S, 391 DK_DCB_W, 392 DK_DCB_X, 393 DK_DS, 394 DK_DS_B, 395 DK_DS_D, 396 DK_DS_L, 397 DK_DS_P, 398 DK_DS_S, 399 DK_DS_W, 400 DK_DS_X, 401 DK_SINGLE, 402 DK_FLOAT, 403 DK_DOUBLE, 404 DK_ALIGN, 405 DK_ALIGN32, 406 DK_BALIGN, 407 DK_BALIGNW, 408 DK_BALIGNL, 409 DK_P2ALIGN, 410 DK_P2ALIGNW, 411 DK_P2ALIGNL, 412 DK_ORG, 413 DK_FILL, 414 DK_ENDR, 415 DK_BUNDLE_ALIGN_MODE, 416 DK_BUNDLE_LOCK, 417 DK_BUNDLE_UNLOCK, 418 DK_ZERO, 419 DK_EXTERN, 420 DK_GLOBL, 421 DK_GLOBAL, 422 DK_LAZY_REFERENCE, 423 DK_NO_DEAD_STRIP, 424 DK_SYMBOL_RESOLVER, 425 DK_PRIVATE_EXTERN, 426 DK_REFERENCE, 427 DK_WEAK_DEFINITION, 428 DK_WEAK_REFERENCE, 429 DK_WEAK_DEF_CAN_BE_HIDDEN, 430 DK_COLD, 431 DK_COMM, 432 DK_COMMON, 433 DK_LCOMM, 434 DK_ABORT, 435 DK_INCLUDE, 436 DK_INCBIN, 437 DK_CODE16, 438 DK_CODE16GCC, 439 DK_REPT, 440 DK_IRP, 441 DK_IRPC, 442 DK_IF, 443 DK_IFEQ, 444 DK_IFGE, 445 DK_IFGT, 446 DK_IFLE, 447 DK_IFLT, 448 DK_IFNE, 449 DK_IFB, 450 DK_IFNB, 451 DK_IFC, 452 DK_IFEQS, 453 DK_IFNC, 454 DK_IFNES, 455 DK_IFDEF, 456 DK_IFNDEF, 457 DK_IFNOTDEF, 458 DK_ELSEIF, 459 DK_ELSE, 460 DK_ENDIF, 461 DK_SPACE, 462 DK_SKIP, 463 DK_FILE, 464 DK_LINE, 465 DK_LOC, 466 DK_STABS, 467 DK_CV_FILE, 468 DK_CV_FUNC_ID, 469 DK_CV_INLINE_SITE_ID, 470 DK_CV_LOC, 471 DK_CV_LINETABLE, 472 DK_CV_INLINE_LINETABLE, 473 DK_CV_DEF_RANGE, 474 DK_CV_STRINGTABLE, 475 DK_CV_STRING, 476 DK_CV_FILECHECKSUMS, 477 DK_CV_FILECHECKSUM_OFFSET, 478 DK_CV_FPO_DATA, 479 DK_CFI_SECTIONS, 480 DK_CFI_STARTPROC, 481 DK_CFI_ENDPROC, 482 DK_CFI_DEF_CFA, 483 DK_CFI_DEF_CFA_OFFSET, 484 DK_CFI_ADJUST_CFA_OFFSET, 485 DK_CFI_DEF_CFA_REGISTER, 486 DK_CFI_OFFSET, 487 DK_CFI_REL_OFFSET, 488 DK_CFI_PERSONALITY, 489 DK_CFI_LSDA, 490 DK_CFI_REMEMBER_STATE, 491 DK_CFI_RESTORE_STATE, 492 DK_CFI_SAME_VALUE, 493 DK_CFI_RESTORE, 494 DK_CFI_ESCAPE, 495 DK_CFI_RETURN_COLUMN, 496 DK_CFI_SIGNAL_FRAME, 497 DK_CFI_UNDEFINED, 498 DK_CFI_REGISTER, 499 DK_CFI_WINDOW_SAVE, 500 DK_CFI_B_KEY_FRAME, 501 DK_MACROS_ON, 502 DK_MACROS_OFF, 503 DK_ALTMACRO, 504 DK_NOALTMACRO, 505 DK_MACRO, 506 DK_EXITM, 507 DK_ENDM, 508 DK_ENDMACRO, 509 DK_PURGEM, 510 DK_SLEB128, 511 DK_ULEB128, 512 DK_ERR, 513 DK_ERROR, 514 DK_WARNING, 515 DK_PRINT, 516 DK_ADDRSIG, 517 DK_ADDRSIG_SYM, 518 DK_PSEUDO_PROBE, 519 DK_END 520 }; 521 522 /// Maps directive name --> DirectiveKind enum, for 523 /// directives parsed by this class. 524 StringMap<DirectiveKind> DirectiveKindMap; 525 526 // Codeview def_range type parsing. 527 enum CVDefRangeType { 528 CVDR_DEFRANGE = 0, // Placeholder 529 CVDR_DEFRANGE_REGISTER, 530 CVDR_DEFRANGE_FRAMEPOINTER_REL, 531 CVDR_DEFRANGE_SUBFIELD_REGISTER, 532 CVDR_DEFRANGE_REGISTER_REL 533 }; 534 535 /// Maps Codeview def_range types --> CVDefRangeType enum, for 536 /// Codeview def_range types parsed by this class. 537 StringMap<CVDefRangeType> CVDefRangeTypeMap; 538 539 // ".ascii", ".asciz", ".string" 540 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); 541 bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc" 542 bool parseDirectiveValue(StringRef IDVal, 543 unsigned Size); // ".byte", ".long", ... 544 bool parseDirectiveOctaValue(StringRef IDVal); // ".octa", ... 545 bool parseDirectiveRealValue(StringRef IDVal, 546 const fltSemantics &); // ".single", ... 547 bool parseDirectiveFill(); // ".fill" 548 bool parseDirectiveZero(); // ".zero" 549 // ".set", ".equ", ".equiv" 550 bool parseDirectiveSet(StringRef IDVal, bool allow_redef); 551 bool parseDirectiveOrg(); // ".org" 552 // ".align{,32}", ".p2align{,w,l}" 553 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize); 554 555 // ".file", ".line", ".loc", ".stabs" 556 bool parseDirectiveFile(SMLoc DirectiveLoc); 557 bool parseDirectiveLine(); 558 bool parseDirectiveLoc(); 559 bool parseDirectiveStabs(); 560 561 // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable", 562 // ".cv_inline_linetable", ".cv_def_range", ".cv_string" 563 bool parseDirectiveCVFile(); 564 bool parseDirectiveCVFuncId(); 565 bool parseDirectiveCVInlineSiteId(); 566 bool parseDirectiveCVLoc(); 567 bool parseDirectiveCVLinetable(); 568 bool parseDirectiveCVInlineLinetable(); 569 bool parseDirectiveCVDefRange(); 570 bool parseDirectiveCVString(); 571 bool parseDirectiveCVStringTable(); 572 bool parseDirectiveCVFileChecksums(); 573 bool parseDirectiveCVFileChecksumOffset(); 574 bool parseDirectiveCVFPOData(); 575 576 // .cfi directives 577 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc); 578 bool parseDirectiveCFIWindowSave(); 579 bool parseDirectiveCFISections(); 580 bool parseDirectiveCFIStartProc(); 581 bool parseDirectiveCFIEndProc(); 582 bool parseDirectiveCFIDefCfaOffset(); 583 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc); 584 bool parseDirectiveCFIAdjustCfaOffset(); 585 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc); 586 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc); 587 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc); 588 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality); 589 bool parseDirectiveCFIRememberState(); 590 bool parseDirectiveCFIRestoreState(); 591 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc); 592 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc); 593 bool parseDirectiveCFIEscape(); 594 bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc); 595 bool parseDirectiveCFISignalFrame(); 596 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc); 597 598 // macro directives 599 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc); 600 bool parseDirectiveExitMacro(StringRef Directive); 601 bool parseDirectiveEndMacro(StringRef Directive); 602 bool parseDirectiveMacro(SMLoc DirectiveLoc); 603 bool parseDirectiveMacrosOnOff(StringRef Directive); 604 // alternate macro mode directives 605 bool parseDirectiveAltmacro(StringRef Directive); 606 // ".bundle_align_mode" 607 bool parseDirectiveBundleAlignMode(); 608 // ".bundle_lock" 609 bool parseDirectiveBundleLock(); 610 // ".bundle_unlock" 611 bool parseDirectiveBundleUnlock(); 612 613 // ".space", ".skip" 614 bool parseDirectiveSpace(StringRef IDVal); 615 616 // ".dcb" 617 bool parseDirectiveDCB(StringRef IDVal, unsigned Size); 618 bool parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &); 619 // ".ds" 620 bool parseDirectiveDS(StringRef IDVal, unsigned Size); 621 622 // .sleb128 (Signed=true) and .uleb128 (Signed=false) 623 bool parseDirectiveLEB128(bool Signed); 624 625 /// Parse a directive like ".globl" which 626 /// accepts a single symbol (which should be a label or an external). 627 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr); 628 629 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm" 630 631 bool parseDirectiveAbort(); // ".abort" 632 bool parseDirectiveInclude(); // ".include" 633 bool parseDirectiveIncbin(); // ".incbin" 634 635 // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne" 636 bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind); 637 // ".ifb" or ".ifnb", depending on ExpectBlank. 638 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank); 639 // ".ifc" or ".ifnc", depending on ExpectEqual. 640 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual); 641 // ".ifeqs" or ".ifnes", depending on ExpectEqual. 642 bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual); 643 // ".ifdef" or ".ifndef", depending on expect_defined 644 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined); 645 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif" 646 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else" 647 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif 648 bool parseEscapedString(std::string &Data) override; 649 bool parseAngleBracketString(std::string &Data) override; 650 651 const MCExpr *applyModifierToExpr(const MCExpr *E, 652 MCSymbolRefExpr::VariantKind Variant); 653 654 // Macro-like directives 655 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc); 656 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 657 raw_svector_ostream &OS); 658 bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive); 659 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp" 660 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc" 661 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr" 662 663 // "_emit" or "__emit" 664 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info, 665 size_t Len); 666 667 // "align" 668 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info); 669 670 // "end" 671 bool parseDirectiveEnd(SMLoc DirectiveLoc); 672 673 // ".err" or ".error" 674 bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage); 675 676 // ".warning" 677 bool parseDirectiveWarning(SMLoc DirectiveLoc); 678 679 // .print <double-quotes-string> 680 bool parseDirectivePrint(SMLoc DirectiveLoc); 681 682 // .pseudoprobe 683 bool parseDirectivePseudoProbe(); 684 685 // Directives to support address-significance tables. 686 bool parseDirectiveAddrsig(); 687 bool parseDirectiveAddrsigSym(); 688 689 void initializeDirectiveKindMap(); 690 void initializeCVDefRangeTypeMap(); 691 }; 692 693 } // end anonymous namespace 694 695 namespace llvm { 696 697 extern MCAsmParserExtension *createDarwinAsmParser(); 698 extern MCAsmParserExtension *createELFAsmParser(); 699 extern MCAsmParserExtension *createCOFFAsmParser(); 700 extern MCAsmParserExtension *createWasmAsmParser(); 701 702 } // end namespace llvm 703 704 enum { DEFAULT_ADDRSPACE = 0 }; 705 706 AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 707 const MCAsmInfo &MAI, unsigned CB = 0) 708 : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM), 709 CurBuffer(CB ? CB : SM.getMainFileID()), MacrosEnabledFlag(true) { 710 HadError = false; 711 // Save the old handler. 712 SavedDiagHandler = SrcMgr.getDiagHandler(); 713 SavedDiagContext = SrcMgr.getDiagContext(); 714 // Set our own handler which calls the saved handler. 715 SrcMgr.setDiagHandler(DiagHandler, this); 716 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 717 // Make MCStreamer aware of the StartTokLoc for locations in diagnostics. 718 Out.setStartTokLocPtr(&StartTokLoc); 719 720 // Initialize the platform / file format parser. 721 switch (Ctx.getObjectFileInfo()->getObjectFileType()) { 722 case MCObjectFileInfo::IsCOFF: 723 PlatformParser.reset(createCOFFAsmParser()); 724 break; 725 case MCObjectFileInfo::IsMachO: 726 PlatformParser.reset(createDarwinAsmParser()); 727 IsDarwin = true; 728 break; 729 case MCObjectFileInfo::IsELF: 730 PlatformParser.reset(createELFAsmParser()); 731 break; 732 case MCObjectFileInfo::IsWasm: 733 PlatformParser.reset(createWasmAsmParser()); 734 break; 735 case MCObjectFileInfo::IsXCOFF: 736 report_fatal_error( 737 "Need to implement createXCOFFAsmParser for XCOFF format."); 738 break; 739 } 740 741 PlatformParser->Initialize(*this); 742 initializeDirectiveKindMap(); 743 initializeCVDefRangeTypeMap(); 744 745 NumOfMacroInstantiations = 0; 746 } 747 748 AsmParser::~AsmParser() { 749 assert((HadError || ActiveMacros.empty()) && 750 "Unexpected active macro instantiation!"); 751 752 // Remove MCStreamer's reference to the parser SMLoc. 753 Out.setStartTokLocPtr(nullptr); 754 // Restore the saved diagnostics handler and context for use during 755 // finalization. 756 SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext); 757 } 758 759 void AsmParser::printMacroInstantiations() { 760 // Print the active macro instantiation stack. 761 for (std::vector<MacroInstantiation *>::const_reverse_iterator 762 it = ActiveMacros.rbegin(), 763 ie = ActiveMacros.rend(); 764 it != ie; ++it) 765 printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note, 766 "while in macro instantiation"); 767 } 768 769 void AsmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) { 770 printPendingErrors(); 771 printMessage(L, SourceMgr::DK_Note, Msg, Range); 772 printMacroInstantiations(); 773 } 774 775 bool AsmParser::Warning(SMLoc L, const Twine &Msg, SMRange Range) { 776 if(getTargetParser().getTargetOptions().MCNoWarn) 777 return false; 778 if (getTargetParser().getTargetOptions().MCFatalWarnings) 779 return Error(L, Msg, Range); 780 printMessage(L, SourceMgr::DK_Warning, Msg, Range); 781 printMacroInstantiations(); 782 return false; 783 } 784 785 bool AsmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) { 786 HadError = true; 787 printMessage(L, SourceMgr::DK_Error, Msg, Range); 788 printMacroInstantiations(); 789 return true; 790 } 791 792 bool AsmParser::enterIncludeFile(const std::string &Filename) { 793 std::string IncludedFile; 794 unsigned NewBuf = 795 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 796 if (!NewBuf) 797 return true; 798 799 CurBuffer = NewBuf; 800 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 801 return false; 802 } 803 804 /// Process the specified .incbin file by searching for it in the include paths 805 /// then just emitting the byte contents of the file to the streamer. This 806 /// returns true on failure. 807 bool AsmParser::processIncbinFile(const std::string &Filename, int64_t Skip, 808 const MCExpr *Count, SMLoc Loc) { 809 std::string IncludedFile; 810 unsigned NewBuf = 811 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 812 if (!NewBuf) 813 return true; 814 815 // Pick up the bytes from the file and emit them. 816 StringRef Bytes = SrcMgr.getMemoryBuffer(NewBuf)->getBuffer(); 817 Bytes = Bytes.drop_front(Skip); 818 if (Count) { 819 int64_t Res; 820 if (!Count->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr())) 821 return Error(Loc, "expected absolute expression"); 822 if (Res < 0) 823 return Warning(Loc, "negative count has no effect"); 824 Bytes = Bytes.take_front(Res); 825 } 826 getStreamer().emitBytes(Bytes); 827 return false; 828 } 829 830 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) { 831 CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc); 832 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(), 833 Loc.getPointer()); 834 } 835 836 const AsmToken &AsmParser::Lex() { 837 if (Lexer.getTok().is(AsmToken::Error)) 838 Error(Lexer.getErrLoc(), Lexer.getErr()); 839 840 // if it's a end of statement with a comment in it 841 if (getTok().is(AsmToken::EndOfStatement)) { 842 // if this is a line comment output it. 843 if (!getTok().getString().empty() && getTok().getString().front() != '\n' && 844 getTok().getString().front() != '\r' && MAI.preserveAsmComments()) 845 Out.addExplicitComment(Twine(getTok().getString())); 846 } 847 848 const AsmToken *tok = &Lexer.Lex(); 849 850 // Parse comments here to be deferred until end of next statement. 851 while (tok->is(AsmToken::Comment)) { 852 if (MAI.preserveAsmComments()) 853 Out.addExplicitComment(Twine(tok->getString())); 854 tok = &Lexer.Lex(); 855 } 856 857 if (tok->is(AsmToken::Eof)) { 858 // If this is the end of an included file, pop the parent file off the 859 // include stack. 860 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer); 861 if (ParentIncludeLoc != SMLoc()) { 862 jumpToLoc(ParentIncludeLoc); 863 return Lex(); 864 } 865 } 866 867 return *tok; 868 } 869 870 bool AsmParser::enabledGenDwarfForAssembly() { 871 // Check whether the user specified -g. 872 if (!getContext().getGenDwarfForAssembly()) 873 return false; 874 // If we haven't encountered any .file directives (which would imply that 875 // the assembler source was produced with debug info already) then emit one 876 // describing the assembler source file itself. 877 if (getContext().getGenDwarfFileNumber() == 0) { 878 // Use the first #line directive for this, if any. It's preprocessed, so 879 // there is no checksum, and of course no source directive. 880 if (!FirstCppHashFilename.empty()) 881 getContext().setMCLineTableRootFile(/*CUID=*/0, 882 getContext().getCompilationDir(), 883 FirstCppHashFilename, 884 /*Cksum=*/None, /*Source=*/None); 885 const MCDwarfFile &RootFile = 886 getContext().getMCDwarfLineTable(/*CUID=*/0).getRootFile(); 887 getContext().setGenDwarfFileNumber(getStreamer().emitDwarfFileDirective( 888 /*CUID=*/0, getContext().getCompilationDir(), RootFile.Name, 889 RootFile.Checksum, RootFile.Source)); 890 } 891 return true; 892 } 893 894 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) { 895 // Create the initial section, if requested. 896 if (!NoInitialTextSection) 897 Out.InitSections(false); 898 899 // Prime the lexer. 900 Lex(); 901 902 HadError = false; 903 AsmCond StartingCondState = TheCondState; 904 SmallVector<AsmRewrite, 4> AsmStrRewrites; 905 906 // If we are generating dwarf for assembly source files save the initial text 907 // section. (Don't use enabledGenDwarfForAssembly() here, as we aren't 908 // emitting any actual debug info yet and haven't had a chance to parse any 909 // embedded .file directives.) 910 if (getContext().getGenDwarfForAssembly()) { 911 MCSection *Sec = getStreamer().getCurrentSectionOnly(); 912 if (!Sec->getBeginSymbol()) { 913 MCSymbol *SectionStartSym = getContext().createTempSymbol(); 914 getStreamer().emitLabel(SectionStartSym); 915 Sec->setBeginSymbol(SectionStartSym); 916 } 917 bool InsertResult = getContext().addGenDwarfSection(Sec); 918 assert(InsertResult && ".text section should not have debug info yet"); 919 (void)InsertResult; 920 } 921 922 // While we have input, parse each statement. 923 while (Lexer.isNot(AsmToken::Eof)) { 924 ParseStatementInfo Info(&AsmStrRewrites); 925 bool Parsed = parseStatement(Info, nullptr); 926 927 // If we have a Lexer Error we are on an Error Token. Load in Lexer Error 928 // for printing ErrMsg via Lex() only if no (presumably better) parser error 929 // exists. 930 if (Parsed && !hasPendingError() && Lexer.getTok().is(AsmToken::Error)) { 931 Lex(); 932 } 933 934 // parseStatement returned true so may need to emit an error. 935 printPendingErrors(); 936 937 // Skipping to the next line if needed. 938 if (Parsed && !getLexer().isAtStartOfStatement()) 939 eatToEndOfStatement(); 940 } 941 942 getTargetParser().onEndOfFile(); 943 printPendingErrors(); 944 945 // All errors should have been emitted. 946 assert(!hasPendingError() && "unexpected error from parseStatement"); 947 948 getTargetParser().flushPendingInstructions(getStreamer()); 949 950 if (TheCondState.TheCond != StartingCondState.TheCond || 951 TheCondState.Ignore != StartingCondState.Ignore) 952 printError(getTok().getLoc(), "unmatched .ifs or .elses"); 953 // Check to see there are no empty DwarfFile slots. 954 const auto &LineTables = getContext().getMCDwarfLineTables(); 955 if (!LineTables.empty()) { 956 unsigned Index = 0; 957 for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) { 958 if (File.Name.empty() && Index != 0) 959 printError(getTok().getLoc(), "unassigned file number: " + 960 Twine(Index) + 961 " for .file directives"); 962 ++Index; 963 } 964 } 965 966 // Check to see that all assembler local symbols were actually defined. 967 // Targets that don't do subsections via symbols may not want this, though, 968 // so conservatively exclude them. Only do this if we're finalizing, though, 969 // as otherwise we won't necessarilly have seen everything yet. 970 if (!NoFinalize) { 971 if (MAI.hasSubsectionsViaSymbols()) { 972 for (const auto &TableEntry : getContext().getSymbols()) { 973 MCSymbol *Sym = TableEntry.getValue(); 974 // Variable symbols may not be marked as defined, so check those 975 // explicitly. If we know it's a variable, we have a definition for 976 // the purposes of this check. 977 if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined()) 978 // FIXME: We would really like to refer back to where the symbol was 979 // first referenced for a source location. We need to add something 980 // to track that. Currently, we just point to the end of the file. 981 printError(getTok().getLoc(), "assembler local symbol '" + 982 Sym->getName() + "' not defined"); 983 } 984 } 985 986 // Temporary symbols like the ones for directional jumps don't go in the 987 // symbol table. They also need to be diagnosed in all (final) cases. 988 for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) { 989 if (std::get<2>(LocSym)->isUndefined()) { 990 // Reset the state of any "# line file" directives we've seen to the 991 // context as it was at the diagnostic site. 992 CppHashInfo = std::get<1>(LocSym); 993 printError(std::get<0>(LocSym), "directional label undefined"); 994 } 995 } 996 } 997 998 // Finalize the output stream if there are no errors and if the client wants 999 // us to. 1000 if (!HadError && !NoFinalize) 1001 Out.Finish(Lexer.getLoc()); 1002 1003 return HadError || getContext().hadError(); 1004 } 1005 1006 bool AsmParser::checkForValidSection() { 1007 if (!ParsingMSInlineAsm && !getStreamer().getCurrentSectionOnly()) { 1008 Out.InitSections(false); 1009 return Error(getTok().getLoc(), 1010 "expected section directive before assembly directive"); 1011 } 1012 return false; 1013 } 1014 1015 /// Throw away the rest of the line for testing purposes. 1016 void AsmParser::eatToEndOfStatement() { 1017 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 1018 Lexer.Lex(); 1019 1020 // Eat EOL. 1021 if (Lexer.is(AsmToken::EndOfStatement)) 1022 Lexer.Lex(); 1023 } 1024 1025 StringRef AsmParser::parseStringToEndOfStatement() { 1026 const char *Start = getTok().getLoc().getPointer(); 1027 1028 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 1029 Lexer.Lex(); 1030 1031 const char *End = getTok().getLoc().getPointer(); 1032 return StringRef(Start, End - Start); 1033 } 1034 1035 StringRef AsmParser::parseStringToComma() { 1036 const char *Start = getTok().getLoc().getPointer(); 1037 1038 while (Lexer.isNot(AsmToken::EndOfStatement) && 1039 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof)) 1040 Lexer.Lex(); 1041 1042 const char *End = getTok().getLoc().getPointer(); 1043 return StringRef(Start, End - Start); 1044 } 1045 1046 /// Parse a paren expression and return it. 1047 /// NOTE: This assumes the leading '(' has already been consumed. 1048 /// 1049 /// parenexpr ::= expr) 1050 /// 1051 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) { 1052 if (parseExpression(Res)) 1053 return true; 1054 if (Lexer.isNot(AsmToken::RParen)) 1055 return TokError("expected ')' in parentheses expression"); 1056 EndLoc = Lexer.getTok().getEndLoc(); 1057 Lex(); 1058 return false; 1059 } 1060 1061 /// Parse a bracket expression and return it. 1062 /// NOTE: This assumes the leading '[' has already been consumed. 1063 /// 1064 /// bracketexpr ::= expr] 1065 /// 1066 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) { 1067 if (parseExpression(Res)) 1068 return true; 1069 EndLoc = getTok().getEndLoc(); 1070 if (parseToken(AsmToken::RBrac, "expected ']' in brackets expression")) 1071 return true; 1072 return false; 1073 } 1074 1075 /// Parse a primary expression and return it. 1076 /// primaryexpr ::= (parenexpr 1077 /// primaryexpr ::= symbol 1078 /// primaryexpr ::= number 1079 /// primaryexpr ::= '.' 1080 /// primaryexpr ::= ~,+,- primaryexpr 1081 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc, 1082 AsmTypeInfo *TypeInfo) { 1083 SMLoc FirstTokenLoc = getLexer().getLoc(); 1084 AsmToken::TokenKind FirstTokenKind = Lexer.getKind(); 1085 switch (FirstTokenKind) { 1086 default: 1087 return TokError("unknown token in expression"); 1088 // If we have an error assume that we've already handled it. 1089 case AsmToken::Error: 1090 return true; 1091 case AsmToken::Exclaim: 1092 Lex(); // Eat the operator. 1093 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1094 return true; 1095 Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc); 1096 return false; 1097 case AsmToken::Dollar: 1098 case AsmToken::At: 1099 case AsmToken::String: 1100 case AsmToken::Identifier: { 1101 StringRef Identifier; 1102 if (parseIdentifier(Identifier)) { 1103 // We may have failed but $ may be a valid token. 1104 if (getTok().is(AsmToken::Dollar)) { 1105 if (Lexer.getMAI().getDollarIsPC()) { 1106 Lex(); 1107 // This is a '$' reference, which references the current PC. Emit a 1108 // temporary label to the streamer and refer to it. 1109 MCSymbol *Sym = Ctx.createTempSymbol(); 1110 Out.emitLabel(Sym); 1111 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, 1112 getContext()); 1113 EndLoc = FirstTokenLoc; 1114 return false; 1115 } 1116 return Error(FirstTokenLoc, "invalid token in expression"); 1117 } 1118 } 1119 // Parse symbol variant 1120 std::pair<StringRef, StringRef> Split; 1121 if (!MAI.useParensForSymbolVariant()) { 1122 if (FirstTokenKind == AsmToken::String) { 1123 if (Lexer.is(AsmToken::At)) { 1124 Lex(); // eat @ 1125 SMLoc AtLoc = getLexer().getLoc(); 1126 StringRef VName; 1127 if (parseIdentifier(VName)) 1128 return Error(AtLoc, "expected symbol variant after '@'"); 1129 1130 Split = std::make_pair(Identifier, VName); 1131 } 1132 } else { 1133 Split = Identifier.split('@'); 1134 } 1135 } else if (Lexer.is(AsmToken::LParen)) { 1136 Lex(); // eat '('. 1137 StringRef VName; 1138 parseIdentifier(VName); 1139 // eat ')'. 1140 if (parseToken(AsmToken::RParen, 1141 "unexpected token in variant, expected ')'")) 1142 return true; 1143 Split = std::make_pair(Identifier, VName); 1144 } 1145 1146 EndLoc = SMLoc::getFromPointer(Identifier.end()); 1147 1148 // This is a symbol reference. 1149 StringRef SymbolName = Identifier; 1150 if (SymbolName.empty()) 1151 return Error(getLexer().getLoc(), "expected a symbol reference"); 1152 1153 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 1154 1155 // Lookup the symbol variant if used. 1156 if (!Split.second.empty()) { 1157 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 1158 if (Variant != MCSymbolRefExpr::VK_Invalid) { 1159 SymbolName = Split.first; 1160 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) { 1161 Variant = MCSymbolRefExpr::VK_None; 1162 } else { 1163 return Error(SMLoc::getFromPointer(Split.second.begin()), 1164 "invalid variant '" + Split.second + "'"); 1165 } 1166 } 1167 1168 MCSymbol *Sym = getContext().getInlineAsmLabel(SymbolName); 1169 if (!Sym) 1170 Sym = getContext().getOrCreateSymbol(SymbolName); 1171 1172 // If this is an absolute variable reference, substitute it now to preserve 1173 // semantics in the face of reassignment. 1174 if (Sym->isVariable()) { 1175 auto V = Sym->getVariableValue(/*SetUsed*/ false); 1176 bool DoInline = isa<MCConstantExpr>(V) && !Variant; 1177 if (auto TV = dyn_cast<MCTargetExpr>(V)) 1178 DoInline = TV->inlineAssignedExpr(); 1179 if (DoInline) { 1180 if (Variant) 1181 return Error(EndLoc, "unexpected modifier on variable reference"); 1182 Res = Sym->getVariableValue(/*SetUsed*/ false); 1183 return false; 1184 } 1185 } 1186 1187 // Otherwise create a symbol ref. 1188 Res = MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc); 1189 return false; 1190 } 1191 case AsmToken::BigNum: 1192 return TokError("literal value out of range for directive"); 1193 case AsmToken::Integer: { 1194 SMLoc Loc = getTok().getLoc(); 1195 int64_t IntVal = getTok().getIntVal(); 1196 Res = MCConstantExpr::create(IntVal, getContext()); 1197 EndLoc = Lexer.getTok().getEndLoc(); 1198 Lex(); // Eat token. 1199 // Look for 'b' or 'f' following an Integer as a directional label 1200 if (Lexer.getKind() == AsmToken::Identifier) { 1201 StringRef IDVal = getTok().getString(); 1202 // Lookup the symbol variant if used. 1203 std::pair<StringRef, StringRef> Split = IDVal.split('@'); 1204 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 1205 if (Split.first.size() != IDVal.size()) { 1206 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 1207 if (Variant == MCSymbolRefExpr::VK_Invalid) 1208 return TokError("invalid variant '" + Split.second + "'"); 1209 IDVal = Split.first; 1210 } 1211 if (IDVal == "f" || IDVal == "b") { 1212 MCSymbol *Sym = 1213 Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b"); 1214 Res = MCSymbolRefExpr::create(Sym, Variant, getContext()); 1215 if (IDVal == "b" && Sym->isUndefined()) 1216 return Error(Loc, "directional label undefined"); 1217 DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym)); 1218 EndLoc = Lexer.getTok().getEndLoc(); 1219 Lex(); // Eat identifier. 1220 } 1221 } 1222 return false; 1223 } 1224 case AsmToken::Real: { 1225 APFloat RealVal(APFloat::IEEEdouble(), getTok().getString()); 1226 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue(); 1227 Res = MCConstantExpr::create(IntVal, getContext()); 1228 EndLoc = Lexer.getTok().getEndLoc(); 1229 Lex(); // Eat token. 1230 return false; 1231 } 1232 case AsmToken::Dot: { 1233 // This is a '.' reference, which references the current PC. Emit a 1234 // temporary label to the streamer and refer to it. 1235 MCSymbol *Sym = Ctx.createTempSymbol(); 1236 Out.emitLabel(Sym); 1237 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext()); 1238 EndLoc = Lexer.getTok().getEndLoc(); 1239 Lex(); // Eat identifier. 1240 return false; 1241 } 1242 case AsmToken::LParen: 1243 Lex(); // Eat the '('. 1244 return parseParenExpr(Res, EndLoc); 1245 case AsmToken::LBrac: 1246 if (!PlatformParser->HasBracketExpressions()) 1247 return TokError("brackets expression not supported on this target"); 1248 Lex(); // Eat the '['. 1249 return parseBracketExpr(Res, EndLoc); 1250 case AsmToken::Minus: 1251 Lex(); // Eat the operator. 1252 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1253 return true; 1254 Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc); 1255 return false; 1256 case AsmToken::Plus: 1257 Lex(); // Eat the operator. 1258 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1259 return true; 1260 Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc); 1261 return false; 1262 case AsmToken::Tilde: 1263 Lex(); // Eat the operator. 1264 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1265 return true; 1266 Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc); 1267 return false; 1268 // MIPS unary expression operators. The lexer won't generate these tokens if 1269 // MCAsmInfo::HasMipsExpressions is false for the target. 1270 case AsmToken::PercentCall16: 1271 case AsmToken::PercentCall_Hi: 1272 case AsmToken::PercentCall_Lo: 1273 case AsmToken::PercentDtprel_Hi: 1274 case AsmToken::PercentDtprel_Lo: 1275 case AsmToken::PercentGot: 1276 case AsmToken::PercentGot_Disp: 1277 case AsmToken::PercentGot_Hi: 1278 case AsmToken::PercentGot_Lo: 1279 case AsmToken::PercentGot_Ofst: 1280 case AsmToken::PercentGot_Page: 1281 case AsmToken::PercentGottprel: 1282 case AsmToken::PercentGp_Rel: 1283 case AsmToken::PercentHi: 1284 case AsmToken::PercentHigher: 1285 case AsmToken::PercentHighest: 1286 case AsmToken::PercentLo: 1287 case AsmToken::PercentNeg: 1288 case AsmToken::PercentPcrel_Hi: 1289 case AsmToken::PercentPcrel_Lo: 1290 case AsmToken::PercentTlsgd: 1291 case AsmToken::PercentTlsldm: 1292 case AsmToken::PercentTprel_Hi: 1293 case AsmToken::PercentTprel_Lo: 1294 Lex(); // Eat the operator. 1295 if (Lexer.isNot(AsmToken::LParen)) 1296 return TokError("expected '(' after operator"); 1297 Lex(); // Eat the operator. 1298 if (parseExpression(Res, EndLoc)) 1299 return true; 1300 if (Lexer.isNot(AsmToken::RParen)) 1301 return TokError("expected ')'"); 1302 Lex(); // Eat the operator. 1303 Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx); 1304 return !Res; 1305 } 1306 } 1307 1308 bool AsmParser::parseExpression(const MCExpr *&Res) { 1309 SMLoc EndLoc; 1310 return parseExpression(Res, EndLoc); 1311 } 1312 1313 const MCExpr * 1314 AsmParser::applyModifierToExpr(const MCExpr *E, 1315 MCSymbolRefExpr::VariantKind Variant) { 1316 // Ask the target implementation about this expression first. 1317 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx); 1318 if (NewE) 1319 return NewE; 1320 // Recurse over the given expression, rebuilding it to apply the given variant 1321 // if there is exactly one symbol. 1322 switch (E->getKind()) { 1323 case MCExpr::Target: 1324 case MCExpr::Constant: 1325 return nullptr; 1326 1327 case MCExpr::SymbolRef: { 1328 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E); 1329 1330 if (SRE->getKind() != MCSymbolRefExpr::VK_None) { 1331 TokError("invalid variant on expression '" + getTok().getIdentifier() + 1332 "' (already modified)"); 1333 return E; 1334 } 1335 1336 return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext()); 1337 } 1338 1339 case MCExpr::Unary: { 1340 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E); 1341 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant); 1342 if (!Sub) 1343 return nullptr; 1344 return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext()); 1345 } 1346 1347 case MCExpr::Binary: { 1348 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E); 1349 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant); 1350 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant); 1351 1352 if (!LHS && !RHS) 1353 return nullptr; 1354 1355 if (!LHS) 1356 LHS = BE->getLHS(); 1357 if (!RHS) 1358 RHS = BE->getRHS(); 1359 1360 return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext()); 1361 } 1362 } 1363 1364 llvm_unreachable("Invalid expression kind!"); 1365 } 1366 1367 /// This function checks if the next token is <string> type or arithmetic. 1368 /// string that begin with character '<' must end with character '>'. 1369 /// otherwise it is arithmetics. 1370 /// If the function returns a 'true' value, 1371 /// the End argument will be filled with the last location pointed to the '>' 1372 /// character. 1373 1374 /// There is a gap between the AltMacro's documentation and the single quote 1375 /// implementation. GCC does not fully support this feature and so we will not 1376 /// support it. 1377 /// TODO: Adding single quote as a string. 1378 static bool isAngleBracketString(SMLoc &StrLoc, SMLoc &EndLoc) { 1379 assert((StrLoc.getPointer() != nullptr) && 1380 "Argument to the function cannot be a NULL value"); 1381 const char *CharPtr = StrLoc.getPointer(); 1382 while ((*CharPtr != '>') && (*CharPtr != '\n') && (*CharPtr != '\r') && 1383 (*CharPtr != '\0')) { 1384 if (*CharPtr == '!') 1385 CharPtr++; 1386 CharPtr++; 1387 } 1388 if (*CharPtr == '>') { 1389 EndLoc = StrLoc.getFromPointer(CharPtr + 1); 1390 return true; 1391 } 1392 return false; 1393 } 1394 1395 /// creating a string without the escape characters '!'. 1396 static std::string angleBracketString(StringRef AltMacroStr) { 1397 std::string Res; 1398 for (size_t Pos = 0; Pos < AltMacroStr.size(); Pos++) { 1399 if (AltMacroStr[Pos] == '!') 1400 Pos++; 1401 Res += AltMacroStr[Pos]; 1402 } 1403 return Res; 1404 } 1405 1406 /// Parse an expression and return it. 1407 /// 1408 /// expr ::= expr &&,|| expr -> lowest. 1409 /// expr ::= expr |,^,&,! expr 1410 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr 1411 /// expr ::= expr <<,>> expr 1412 /// expr ::= expr +,- expr 1413 /// expr ::= expr *,/,% expr -> highest. 1414 /// expr ::= primaryexpr 1415 /// 1416 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1417 // Parse the expression. 1418 Res = nullptr; 1419 if (getTargetParser().parsePrimaryExpr(Res, EndLoc) || 1420 parseBinOpRHS(1, Res, EndLoc)) 1421 return true; 1422 1423 // As a special case, we support 'a op b @ modifier' by rewriting the 1424 // expression to include the modifier. This is inefficient, but in general we 1425 // expect users to use 'a@modifier op b'. 1426 if (Lexer.getKind() == AsmToken::At) { 1427 Lex(); 1428 1429 if (Lexer.isNot(AsmToken::Identifier)) 1430 return TokError("unexpected symbol modifier following '@'"); 1431 1432 MCSymbolRefExpr::VariantKind Variant = 1433 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier()); 1434 if (Variant == MCSymbolRefExpr::VK_Invalid) 1435 return TokError("invalid variant '" + getTok().getIdentifier() + "'"); 1436 1437 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant); 1438 if (!ModifiedRes) { 1439 return TokError("invalid modifier '" + getTok().getIdentifier() + 1440 "' (no symbols present)"); 1441 } 1442 1443 Res = ModifiedRes; 1444 Lex(); 1445 } 1446 1447 // Try to constant fold it up front, if possible. Do not exploit 1448 // assembler here. 1449 int64_t Value; 1450 if (Res->evaluateAsAbsolute(Value)) 1451 Res = MCConstantExpr::create(Value, getContext()); 1452 1453 return false; 1454 } 1455 1456 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1457 Res = nullptr; 1458 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc); 1459 } 1460 1461 bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 1462 SMLoc &EndLoc) { 1463 if (parseParenExpr(Res, EndLoc)) 1464 return true; 1465 1466 for (; ParenDepth > 0; --ParenDepth) { 1467 if (parseBinOpRHS(1, Res, EndLoc)) 1468 return true; 1469 1470 // We don't Lex() the last RParen. 1471 // This is the same behavior as parseParenExpression(). 1472 if (ParenDepth - 1 > 0) { 1473 EndLoc = getTok().getEndLoc(); 1474 if (parseToken(AsmToken::RParen, 1475 "expected ')' in parentheses expression")) 1476 return true; 1477 } 1478 } 1479 return false; 1480 } 1481 1482 bool AsmParser::parseAbsoluteExpression(int64_t &Res) { 1483 const MCExpr *Expr; 1484 1485 SMLoc StartLoc = Lexer.getLoc(); 1486 if (parseExpression(Expr)) 1487 return true; 1488 1489 if (!Expr->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr())) 1490 return Error(StartLoc, "expected absolute expression"); 1491 1492 return false; 1493 } 1494 1495 static unsigned getDarwinBinOpPrecedence(AsmToken::TokenKind K, 1496 MCBinaryExpr::Opcode &Kind, 1497 bool ShouldUseLogicalShr) { 1498 switch (K) { 1499 default: 1500 return 0; // not a binop. 1501 1502 // Lowest Precedence: &&, || 1503 case AsmToken::AmpAmp: 1504 Kind = MCBinaryExpr::LAnd; 1505 return 1; 1506 case AsmToken::PipePipe: 1507 Kind = MCBinaryExpr::LOr; 1508 return 1; 1509 1510 // Low Precedence: |, &, ^ 1511 case AsmToken::Pipe: 1512 Kind = MCBinaryExpr::Or; 1513 return 2; 1514 case AsmToken::Caret: 1515 Kind = MCBinaryExpr::Xor; 1516 return 2; 1517 case AsmToken::Amp: 1518 Kind = MCBinaryExpr::And; 1519 return 2; 1520 1521 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >= 1522 case AsmToken::EqualEqual: 1523 Kind = MCBinaryExpr::EQ; 1524 return 3; 1525 case AsmToken::ExclaimEqual: 1526 case AsmToken::LessGreater: 1527 Kind = MCBinaryExpr::NE; 1528 return 3; 1529 case AsmToken::Less: 1530 Kind = MCBinaryExpr::LT; 1531 return 3; 1532 case AsmToken::LessEqual: 1533 Kind = MCBinaryExpr::LTE; 1534 return 3; 1535 case AsmToken::Greater: 1536 Kind = MCBinaryExpr::GT; 1537 return 3; 1538 case AsmToken::GreaterEqual: 1539 Kind = MCBinaryExpr::GTE; 1540 return 3; 1541 1542 // Intermediate Precedence: <<, >> 1543 case AsmToken::LessLess: 1544 Kind = MCBinaryExpr::Shl; 1545 return 4; 1546 case AsmToken::GreaterGreater: 1547 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1548 return 4; 1549 1550 // High Intermediate Precedence: +, - 1551 case AsmToken::Plus: 1552 Kind = MCBinaryExpr::Add; 1553 return 5; 1554 case AsmToken::Minus: 1555 Kind = MCBinaryExpr::Sub; 1556 return 5; 1557 1558 // Highest Precedence: *, /, % 1559 case AsmToken::Star: 1560 Kind = MCBinaryExpr::Mul; 1561 return 6; 1562 case AsmToken::Slash: 1563 Kind = MCBinaryExpr::Div; 1564 return 6; 1565 case AsmToken::Percent: 1566 Kind = MCBinaryExpr::Mod; 1567 return 6; 1568 } 1569 } 1570 1571 static unsigned getGNUBinOpPrecedence(const MCAsmInfo &MAI, 1572 AsmToken::TokenKind K, 1573 MCBinaryExpr::Opcode &Kind, 1574 bool ShouldUseLogicalShr) { 1575 switch (K) { 1576 default: 1577 return 0; // not a binop. 1578 1579 // Lowest Precedence: &&, || 1580 case AsmToken::AmpAmp: 1581 Kind = MCBinaryExpr::LAnd; 1582 return 2; 1583 case AsmToken::PipePipe: 1584 Kind = MCBinaryExpr::LOr; 1585 return 1; 1586 1587 // Low Precedence: ==, !=, <>, <, <=, >, >= 1588 case AsmToken::EqualEqual: 1589 Kind = MCBinaryExpr::EQ; 1590 return 3; 1591 case AsmToken::ExclaimEqual: 1592 case AsmToken::LessGreater: 1593 Kind = MCBinaryExpr::NE; 1594 return 3; 1595 case AsmToken::Less: 1596 Kind = MCBinaryExpr::LT; 1597 return 3; 1598 case AsmToken::LessEqual: 1599 Kind = MCBinaryExpr::LTE; 1600 return 3; 1601 case AsmToken::Greater: 1602 Kind = MCBinaryExpr::GT; 1603 return 3; 1604 case AsmToken::GreaterEqual: 1605 Kind = MCBinaryExpr::GTE; 1606 return 3; 1607 1608 // Low Intermediate Precedence: +, - 1609 case AsmToken::Plus: 1610 Kind = MCBinaryExpr::Add; 1611 return 4; 1612 case AsmToken::Minus: 1613 Kind = MCBinaryExpr::Sub; 1614 return 4; 1615 1616 // High Intermediate Precedence: |, !, &, ^ 1617 // 1618 case AsmToken::Pipe: 1619 Kind = MCBinaryExpr::Or; 1620 return 5; 1621 case AsmToken::Exclaim: 1622 // Hack to support ARM compatible aliases (implied 'sp' operand in 'srs*' 1623 // instructions like 'srsda #31!') and not parse ! as an infix operator. 1624 if (MAI.getCommentString() == "@") 1625 return 0; 1626 Kind = MCBinaryExpr::OrNot; 1627 return 5; 1628 case AsmToken::Caret: 1629 Kind = MCBinaryExpr::Xor; 1630 return 5; 1631 case AsmToken::Amp: 1632 Kind = MCBinaryExpr::And; 1633 return 5; 1634 1635 // Highest Precedence: *, /, %, <<, >> 1636 case AsmToken::Star: 1637 Kind = MCBinaryExpr::Mul; 1638 return 6; 1639 case AsmToken::Slash: 1640 Kind = MCBinaryExpr::Div; 1641 return 6; 1642 case AsmToken::Percent: 1643 Kind = MCBinaryExpr::Mod; 1644 return 6; 1645 case AsmToken::LessLess: 1646 Kind = MCBinaryExpr::Shl; 1647 return 6; 1648 case AsmToken::GreaterGreater: 1649 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1650 return 6; 1651 } 1652 } 1653 1654 unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K, 1655 MCBinaryExpr::Opcode &Kind) { 1656 bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr(); 1657 return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr) 1658 : getGNUBinOpPrecedence(MAI, K, Kind, ShouldUseLogicalShr); 1659 } 1660 1661 /// Parse all binary operators with precedence >= 'Precedence'. 1662 /// Res contains the LHS of the expression on input. 1663 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, 1664 SMLoc &EndLoc) { 1665 SMLoc StartLoc = Lexer.getLoc(); 1666 while (true) { 1667 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add; 1668 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind); 1669 1670 // If the next token is lower precedence than we are allowed to eat, return 1671 // successfully with what we ate already. 1672 if (TokPrec < Precedence) 1673 return false; 1674 1675 Lex(); 1676 1677 // Eat the next primary expression. 1678 const MCExpr *RHS; 1679 if (getTargetParser().parsePrimaryExpr(RHS, EndLoc)) 1680 return true; 1681 1682 // If BinOp binds less tightly with RHS than the operator after RHS, let 1683 // the pending operator take RHS as its LHS. 1684 MCBinaryExpr::Opcode Dummy; 1685 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy); 1686 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc)) 1687 return true; 1688 1689 // Merge LHS and RHS according to operator. 1690 Res = MCBinaryExpr::create(Kind, Res, RHS, getContext(), StartLoc); 1691 } 1692 } 1693 1694 /// ParseStatement: 1695 /// ::= EndOfStatement 1696 /// ::= Label* Directive ...Operands... EndOfStatement 1697 /// ::= Label* Identifier OperandList* EndOfStatement 1698 bool AsmParser::parseStatement(ParseStatementInfo &Info, 1699 MCAsmParserSemaCallback *SI) { 1700 assert(!hasPendingError() && "parseStatement started with pending error"); 1701 // Eat initial spaces and comments 1702 while (Lexer.is(AsmToken::Space)) 1703 Lex(); 1704 if (Lexer.is(AsmToken::EndOfStatement)) { 1705 // if this is a line comment we can drop it safely 1706 if (getTok().getString().empty() || getTok().getString().front() == '\r' || 1707 getTok().getString().front() == '\n') 1708 Out.AddBlankLine(); 1709 Lex(); 1710 return false; 1711 } 1712 // Statements always start with an identifier. 1713 AsmToken ID = getTok(); 1714 SMLoc IDLoc = ID.getLoc(); 1715 StringRef IDVal; 1716 int64_t LocalLabelVal = -1; 1717 StartTokLoc = ID.getLoc(); 1718 if (Lexer.is(AsmToken::HashDirective)) 1719 return parseCppHashLineFilenameComment(IDLoc, 1720 !isInsideMacroInstantiation()); 1721 1722 // Allow an integer followed by a ':' as a directional local label. 1723 if (Lexer.is(AsmToken::Integer)) { 1724 LocalLabelVal = getTok().getIntVal(); 1725 if (LocalLabelVal < 0) { 1726 if (!TheCondState.Ignore) { 1727 Lex(); // always eat a token 1728 return Error(IDLoc, "unexpected token at start of statement"); 1729 } 1730 IDVal = ""; 1731 } else { 1732 IDVal = getTok().getString(); 1733 Lex(); // Consume the integer token to be used as an identifier token. 1734 if (Lexer.getKind() != AsmToken::Colon) { 1735 if (!TheCondState.Ignore) { 1736 Lex(); // always eat a token 1737 return Error(IDLoc, "unexpected token at start of statement"); 1738 } 1739 } 1740 } 1741 } else if (Lexer.is(AsmToken::Dot)) { 1742 // Treat '.' as a valid identifier in this context. 1743 Lex(); 1744 IDVal = "."; 1745 } else if (Lexer.is(AsmToken::LCurly)) { 1746 // Treat '{' as a valid identifier in this context. 1747 Lex(); 1748 IDVal = "{"; 1749 1750 } else if (Lexer.is(AsmToken::RCurly)) { 1751 // Treat '}' as a valid identifier in this context. 1752 Lex(); 1753 IDVal = "}"; 1754 } else if (Lexer.is(AsmToken::Star) && 1755 getTargetParser().starIsStartOfStatement()) { 1756 // Accept '*' as a valid start of statement. 1757 Lex(); 1758 IDVal = "*"; 1759 } else if (parseIdentifier(IDVal)) { 1760 if (!TheCondState.Ignore) { 1761 Lex(); // always eat a token 1762 return Error(IDLoc, "unexpected token at start of statement"); 1763 } 1764 IDVal = ""; 1765 } 1766 1767 // Handle conditional assembly here before checking for skipping. We 1768 // have to do this so that .endif isn't skipped in a ".if 0" block for 1769 // example. 1770 StringMap<DirectiveKind>::const_iterator DirKindIt = 1771 DirectiveKindMap.find(IDVal.lower()); 1772 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end()) 1773 1774 ? DK_NO_DIRECTIVE 1775 : DirKindIt->getValue(); 1776 switch (DirKind) { 1777 default: 1778 break; 1779 case DK_IF: 1780 case DK_IFEQ: 1781 case DK_IFGE: 1782 case DK_IFGT: 1783 case DK_IFLE: 1784 case DK_IFLT: 1785 case DK_IFNE: 1786 return parseDirectiveIf(IDLoc, DirKind); 1787 case DK_IFB: 1788 return parseDirectiveIfb(IDLoc, true); 1789 case DK_IFNB: 1790 return parseDirectiveIfb(IDLoc, false); 1791 case DK_IFC: 1792 return parseDirectiveIfc(IDLoc, true); 1793 case DK_IFEQS: 1794 return parseDirectiveIfeqs(IDLoc, true); 1795 case DK_IFNC: 1796 return parseDirectiveIfc(IDLoc, false); 1797 case DK_IFNES: 1798 return parseDirectiveIfeqs(IDLoc, false); 1799 case DK_IFDEF: 1800 return parseDirectiveIfdef(IDLoc, true); 1801 case DK_IFNDEF: 1802 case DK_IFNOTDEF: 1803 return parseDirectiveIfdef(IDLoc, false); 1804 case DK_ELSEIF: 1805 return parseDirectiveElseIf(IDLoc); 1806 case DK_ELSE: 1807 return parseDirectiveElse(IDLoc); 1808 case DK_ENDIF: 1809 return parseDirectiveEndIf(IDLoc); 1810 } 1811 1812 // Ignore the statement if in the middle of inactive conditional 1813 // (e.g. ".if 0"). 1814 if (TheCondState.Ignore) { 1815 eatToEndOfStatement(); 1816 return false; 1817 } 1818 1819 // FIXME: Recurse on local labels? 1820 1821 // See what kind of statement we have. 1822 switch (Lexer.getKind()) { 1823 case AsmToken::Colon: { 1824 if (!getTargetParser().isLabel(ID)) 1825 break; 1826 if (checkForValidSection()) 1827 return true; 1828 1829 // identifier ':' -> Label. 1830 Lex(); 1831 1832 // Diagnose attempt to use '.' as a label. 1833 if (IDVal == ".") 1834 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label"); 1835 1836 // Diagnose attempt to use a variable as a label. 1837 // 1838 // FIXME: Diagnostics. Note the location of the definition as a label. 1839 // FIXME: This doesn't diagnose assignment to a symbol which has been 1840 // implicitly marked as external. 1841 MCSymbol *Sym; 1842 if (LocalLabelVal == -1) { 1843 if (ParsingMSInlineAsm && SI) { 1844 StringRef RewrittenLabel = 1845 SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true); 1846 assert(!RewrittenLabel.empty() && 1847 "We should have an internal name here."); 1848 Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(), 1849 RewrittenLabel); 1850 IDVal = RewrittenLabel; 1851 } 1852 Sym = getContext().getOrCreateSymbol(IDVal); 1853 } else 1854 Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal); 1855 // End of Labels should be treated as end of line for lexing 1856 // purposes but that information is not available to the Lexer who 1857 // does not understand Labels. This may cause us to see a Hash 1858 // here instead of a preprocessor line comment. 1859 if (getTok().is(AsmToken::Hash)) { 1860 StringRef CommentStr = parseStringToEndOfStatement(); 1861 Lexer.Lex(); 1862 Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr)); 1863 } 1864 1865 // Consume any end of statement token, if present, to avoid spurious 1866 // AddBlankLine calls(). 1867 if (getTok().is(AsmToken::EndOfStatement)) { 1868 Lex(); 1869 } 1870 1871 getTargetParser().doBeforeLabelEmit(Sym); 1872 1873 // Emit the label. 1874 if (!getTargetParser().isParsingMSInlineAsm()) 1875 Out.emitLabel(Sym, IDLoc); 1876 1877 // If we are generating dwarf for assembly source files then gather the 1878 // info to make a dwarf label entry for this label if needed. 1879 if (enabledGenDwarfForAssembly()) 1880 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), 1881 IDLoc); 1882 1883 getTargetParser().onLabelParsed(Sym); 1884 1885 return false; 1886 } 1887 1888 case AsmToken::Equal: 1889 if (!getTargetParser().equalIsAsmAssignment()) 1890 break; 1891 // identifier '=' ... -> assignment statement 1892 Lex(); 1893 1894 return parseAssignment(IDVal, true); 1895 1896 default: // Normal instruction or directive. 1897 break; 1898 } 1899 1900 // If macros are enabled, check to see if this is a macro instantiation. 1901 if (areMacrosEnabled()) 1902 if (const MCAsmMacro *M = getContext().lookupMacro(IDVal)) { 1903 return handleMacroEntry(M, IDLoc); 1904 } 1905 1906 // Otherwise, we have a normal instruction or directive. 1907 1908 // Directives start with "." 1909 if (IDVal.startswith(".") && IDVal != ".") { 1910 // There are several entities interested in parsing directives: 1911 // 1912 // 1. The target-specific assembly parser. Some directives are target 1913 // specific or may potentially behave differently on certain targets. 1914 // 2. Asm parser extensions. For example, platform-specific parsers 1915 // (like the ELF parser) register themselves as extensions. 1916 // 3. The generic directive parser implemented by this class. These are 1917 // all the directives that behave in a target and platform independent 1918 // manner, or at least have a default behavior that's shared between 1919 // all targets and platforms. 1920 1921 getTargetParser().flushPendingInstructions(getStreamer()); 1922 1923 SMLoc StartTokLoc = getTok().getLoc(); 1924 bool TPDirectiveReturn = getTargetParser().ParseDirective(ID); 1925 1926 if (hasPendingError()) 1927 return true; 1928 // Currently the return value should be true if we are 1929 // uninterested but as this is at odds with the standard parsing 1930 // convention (return true = error) we have instances of a parsed 1931 // directive that fails returning true as an error. Catch these 1932 // cases as best as possible errors here. 1933 if (TPDirectiveReturn && StartTokLoc != getTok().getLoc()) 1934 return true; 1935 // Return if we did some parsing or believe we succeeded. 1936 if (!TPDirectiveReturn || StartTokLoc != getTok().getLoc()) 1937 return false; 1938 1939 // Next, check the extension directive map to see if any extension has 1940 // registered itself to parse this directive. 1941 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler = 1942 ExtensionDirectiveMap.lookup(IDVal); 1943 if (Handler.first) 1944 return (*Handler.second)(Handler.first, IDVal, IDLoc); 1945 1946 // Finally, if no one else is interested in this directive, it must be 1947 // generic and familiar to this class. 1948 switch (DirKind) { 1949 default: 1950 break; 1951 case DK_SET: 1952 case DK_EQU: 1953 return parseDirectiveSet(IDVal, true); 1954 case DK_EQUIV: 1955 return parseDirectiveSet(IDVal, false); 1956 case DK_ASCII: 1957 return parseDirectiveAscii(IDVal, false); 1958 case DK_ASCIZ: 1959 case DK_STRING: 1960 return parseDirectiveAscii(IDVal, true); 1961 case DK_BYTE: 1962 case DK_DC_B: 1963 return parseDirectiveValue(IDVal, 1); 1964 case DK_DC: 1965 case DK_DC_W: 1966 case DK_SHORT: 1967 case DK_VALUE: 1968 case DK_2BYTE: 1969 return parseDirectiveValue(IDVal, 2); 1970 case DK_LONG: 1971 case DK_INT: 1972 case DK_4BYTE: 1973 case DK_DC_L: 1974 return parseDirectiveValue(IDVal, 4); 1975 case DK_QUAD: 1976 case DK_8BYTE: 1977 return parseDirectiveValue(IDVal, 8); 1978 case DK_DC_A: 1979 return parseDirectiveValue( 1980 IDVal, getContext().getAsmInfo()->getCodePointerSize()); 1981 case DK_OCTA: 1982 return parseDirectiveOctaValue(IDVal); 1983 case DK_SINGLE: 1984 case DK_FLOAT: 1985 case DK_DC_S: 1986 return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle()); 1987 case DK_DOUBLE: 1988 case DK_DC_D: 1989 return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble()); 1990 case DK_ALIGN: { 1991 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 1992 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1); 1993 } 1994 case DK_ALIGN32: { 1995 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 1996 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4); 1997 } 1998 case DK_BALIGN: 1999 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); 2000 case DK_BALIGNW: 2001 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); 2002 case DK_BALIGNL: 2003 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); 2004 case DK_P2ALIGN: 2005 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); 2006 case DK_P2ALIGNW: 2007 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); 2008 case DK_P2ALIGNL: 2009 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); 2010 case DK_ORG: 2011 return parseDirectiveOrg(); 2012 case DK_FILL: 2013 return parseDirectiveFill(); 2014 case DK_ZERO: 2015 return parseDirectiveZero(); 2016 case DK_EXTERN: 2017 eatToEndOfStatement(); // .extern is the default, ignore it. 2018 return false; 2019 case DK_GLOBL: 2020 case DK_GLOBAL: 2021 return parseDirectiveSymbolAttribute(MCSA_Global); 2022 case DK_LAZY_REFERENCE: 2023 return parseDirectiveSymbolAttribute(MCSA_LazyReference); 2024 case DK_NO_DEAD_STRIP: 2025 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip); 2026 case DK_SYMBOL_RESOLVER: 2027 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver); 2028 case DK_PRIVATE_EXTERN: 2029 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern); 2030 case DK_REFERENCE: 2031 return parseDirectiveSymbolAttribute(MCSA_Reference); 2032 case DK_WEAK_DEFINITION: 2033 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition); 2034 case DK_WEAK_REFERENCE: 2035 return parseDirectiveSymbolAttribute(MCSA_WeakReference); 2036 case DK_WEAK_DEF_CAN_BE_HIDDEN: 2037 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); 2038 case DK_COLD: 2039 return parseDirectiveSymbolAttribute(MCSA_Cold); 2040 case DK_COMM: 2041 case DK_COMMON: 2042 return parseDirectiveComm(/*IsLocal=*/false); 2043 case DK_LCOMM: 2044 return parseDirectiveComm(/*IsLocal=*/true); 2045 case DK_ABORT: 2046 return parseDirectiveAbort(); 2047 case DK_INCLUDE: 2048 return parseDirectiveInclude(); 2049 case DK_INCBIN: 2050 return parseDirectiveIncbin(); 2051 case DK_CODE16: 2052 case DK_CODE16GCC: 2053 return TokError(Twine(IDVal) + 2054 " not currently supported for this target"); 2055 case DK_REPT: 2056 return parseDirectiveRept(IDLoc, IDVal); 2057 case DK_IRP: 2058 return parseDirectiveIrp(IDLoc); 2059 case DK_IRPC: 2060 return parseDirectiveIrpc(IDLoc); 2061 case DK_ENDR: 2062 return parseDirectiveEndr(IDLoc); 2063 case DK_BUNDLE_ALIGN_MODE: 2064 return parseDirectiveBundleAlignMode(); 2065 case DK_BUNDLE_LOCK: 2066 return parseDirectiveBundleLock(); 2067 case DK_BUNDLE_UNLOCK: 2068 return parseDirectiveBundleUnlock(); 2069 case DK_SLEB128: 2070 return parseDirectiveLEB128(true); 2071 case DK_ULEB128: 2072 return parseDirectiveLEB128(false); 2073 case DK_SPACE: 2074 case DK_SKIP: 2075 return parseDirectiveSpace(IDVal); 2076 case DK_FILE: 2077 return parseDirectiveFile(IDLoc); 2078 case DK_LINE: 2079 return parseDirectiveLine(); 2080 case DK_LOC: 2081 return parseDirectiveLoc(); 2082 case DK_STABS: 2083 return parseDirectiveStabs(); 2084 case DK_CV_FILE: 2085 return parseDirectiveCVFile(); 2086 case DK_CV_FUNC_ID: 2087 return parseDirectiveCVFuncId(); 2088 case DK_CV_INLINE_SITE_ID: 2089 return parseDirectiveCVInlineSiteId(); 2090 case DK_CV_LOC: 2091 return parseDirectiveCVLoc(); 2092 case DK_CV_LINETABLE: 2093 return parseDirectiveCVLinetable(); 2094 case DK_CV_INLINE_LINETABLE: 2095 return parseDirectiveCVInlineLinetable(); 2096 case DK_CV_DEF_RANGE: 2097 return parseDirectiveCVDefRange(); 2098 case DK_CV_STRING: 2099 return parseDirectiveCVString(); 2100 case DK_CV_STRINGTABLE: 2101 return parseDirectiveCVStringTable(); 2102 case DK_CV_FILECHECKSUMS: 2103 return parseDirectiveCVFileChecksums(); 2104 case DK_CV_FILECHECKSUM_OFFSET: 2105 return parseDirectiveCVFileChecksumOffset(); 2106 case DK_CV_FPO_DATA: 2107 return parseDirectiveCVFPOData(); 2108 case DK_CFI_SECTIONS: 2109 return parseDirectiveCFISections(); 2110 case DK_CFI_STARTPROC: 2111 return parseDirectiveCFIStartProc(); 2112 case DK_CFI_ENDPROC: 2113 return parseDirectiveCFIEndProc(); 2114 case DK_CFI_DEF_CFA: 2115 return parseDirectiveCFIDefCfa(IDLoc); 2116 case DK_CFI_DEF_CFA_OFFSET: 2117 return parseDirectiveCFIDefCfaOffset(); 2118 case DK_CFI_ADJUST_CFA_OFFSET: 2119 return parseDirectiveCFIAdjustCfaOffset(); 2120 case DK_CFI_DEF_CFA_REGISTER: 2121 return parseDirectiveCFIDefCfaRegister(IDLoc); 2122 case DK_CFI_OFFSET: 2123 return parseDirectiveCFIOffset(IDLoc); 2124 case DK_CFI_REL_OFFSET: 2125 return parseDirectiveCFIRelOffset(IDLoc); 2126 case DK_CFI_PERSONALITY: 2127 return parseDirectiveCFIPersonalityOrLsda(true); 2128 case DK_CFI_LSDA: 2129 return parseDirectiveCFIPersonalityOrLsda(false); 2130 case DK_CFI_REMEMBER_STATE: 2131 return parseDirectiveCFIRememberState(); 2132 case DK_CFI_RESTORE_STATE: 2133 return parseDirectiveCFIRestoreState(); 2134 case DK_CFI_SAME_VALUE: 2135 return parseDirectiveCFISameValue(IDLoc); 2136 case DK_CFI_RESTORE: 2137 return parseDirectiveCFIRestore(IDLoc); 2138 case DK_CFI_ESCAPE: 2139 return parseDirectiveCFIEscape(); 2140 case DK_CFI_RETURN_COLUMN: 2141 return parseDirectiveCFIReturnColumn(IDLoc); 2142 case DK_CFI_SIGNAL_FRAME: 2143 return parseDirectiveCFISignalFrame(); 2144 case DK_CFI_UNDEFINED: 2145 return parseDirectiveCFIUndefined(IDLoc); 2146 case DK_CFI_REGISTER: 2147 return parseDirectiveCFIRegister(IDLoc); 2148 case DK_CFI_WINDOW_SAVE: 2149 return parseDirectiveCFIWindowSave(); 2150 case DK_MACROS_ON: 2151 case DK_MACROS_OFF: 2152 return parseDirectiveMacrosOnOff(IDVal); 2153 case DK_MACRO: 2154 return parseDirectiveMacro(IDLoc); 2155 case DK_ALTMACRO: 2156 case DK_NOALTMACRO: 2157 return parseDirectiveAltmacro(IDVal); 2158 case DK_EXITM: 2159 return parseDirectiveExitMacro(IDVal); 2160 case DK_ENDM: 2161 case DK_ENDMACRO: 2162 return parseDirectiveEndMacro(IDVal); 2163 case DK_PURGEM: 2164 return parseDirectivePurgeMacro(IDLoc); 2165 case DK_END: 2166 return parseDirectiveEnd(IDLoc); 2167 case DK_ERR: 2168 return parseDirectiveError(IDLoc, false); 2169 case DK_ERROR: 2170 return parseDirectiveError(IDLoc, true); 2171 case DK_WARNING: 2172 return parseDirectiveWarning(IDLoc); 2173 case DK_RELOC: 2174 return parseDirectiveReloc(IDLoc); 2175 case DK_DCB: 2176 case DK_DCB_W: 2177 return parseDirectiveDCB(IDVal, 2); 2178 case DK_DCB_B: 2179 return parseDirectiveDCB(IDVal, 1); 2180 case DK_DCB_D: 2181 return parseDirectiveRealDCB(IDVal, APFloat::IEEEdouble()); 2182 case DK_DCB_L: 2183 return parseDirectiveDCB(IDVal, 4); 2184 case DK_DCB_S: 2185 return parseDirectiveRealDCB(IDVal, APFloat::IEEEsingle()); 2186 case DK_DC_X: 2187 case DK_DCB_X: 2188 return TokError(Twine(IDVal) + 2189 " not currently supported for this target"); 2190 case DK_DS: 2191 case DK_DS_W: 2192 return parseDirectiveDS(IDVal, 2); 2193 case DK_DS_B: 2194 return parseDirectiveDS(IDVal, 1); 2195 case DK_DS_D: 2196 return parseDirectiveDS(IDVal, 8); 2197 case DK_DS_L: 2198 case DK_DS_S: 2199 return parseDirectiveDS(IDVal, 4); 2200 case DK_DS_P: 2201 case DK_DS_X: 2202 return parseDirectiveDS(IDVal, 12); 2203 case DK_PRINT: 2204 return parseDirectivePrint(IDLoc); 2205 case DK_ADDRSIG: 2206 return parseDirectiveAddrsig(); 2207 case DK_ADDRSIG_SYM: 2208 return parseDirectiveAddrsigSym(); 2209 case DK_PSEUDO_PROBE: 2210 return parseDirectivePseudoProbe(); 2211 } 2212 2213 return Error(IDLoc, "unknown directive"); 2214 } 2215 2216 // __asm _emit or __asm __emit 2217 if (ParsingMSInlineAsm && (IDVal == "_emit" || IDVal == "__emit" || 2218 IDVal == "_EMIT" || IDVal == "__EMIT")) 2219 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size()); 2220 2221 // __asm align 2222 if (ParsingMSInlineAsm && (IDVal == "align" || IDVal == "ALIGN")) 2223 return parseDirectiveMSAlign(IDLoc, Info); 2224 2225 if (ParsingMSInlineAsm && (IDVal == "even" || IDVal == "EVEN")) 2226 Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4); 2227 if (checkForValidSection()) 2228 return true; 2229 2230 // Canonicalize the opcode to lower case. 2231 std::string OpcodeStr = IDVal.lower(); 2232 ParseInstructionInfo IInfo(Info.AsmRewrites); 2233 bool ParseHadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID, 2234 Info.ParsedOperands); 2235 Info.ParseError = ParseHadError; 2236 2237 // Dump the parsed representation, if requested. 2238 if (getShowParsedOperands()) { 2239 SmallString<256> Str; 2240 raw_svector_ostream OS(Str); 2241 OS << "parsed instruction: ["; 2242 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) { 2243 if (i != 0) 2244 OS << ", "; 2245 Info.ParsedOperands[i]->print(OS); 2246 } 2247 OS << "]"; 2248 2249 printMessage(IDLoc, SourceMgr::DK_Note, OS.str()); 2250 } 2251 2252 // Fail even if ParseInstruction erroneously returns false. 2253 if (hasPendingError() || ParseHadError) 2254 return true; 2255 2256 // If we are generating dwarf for the current section then generate a .loc 2257 // directive for the instruction. 2258 if (!ParseHadError && enabledGenDwarfForAssembly() && 2259 getContext().getGenDwarfSectionSyms().count( 2260 getStreamer().getCurrentSectionOnly())) { 2261 unsigned Line; 2262 if (ActiveMacros.empty()) 2263 Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer); 2264 else 2265 Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc, 2266 ActiveMacros.front()->ExitBuffer); 2267 2268 // If we previously parsed a cpp hash file line comment then make sure the 2269 // current Dwarf File is for the CppHashFilename if not then emit the 2270 // Dwarf File table for it and adjust the line number for the .loc. 2271 if (!CppHashInfo.Filename.empty()) { 2272 unsigned FileNumber = getStreamer().emitDwarfFileDirective( 2273 0, StringRef(), CppHashInfo.Filename); 2274 getContext().setGenDwarfFileNumber(FileNumber); 2275 2276 unsigned CppHashLocLineNo = 2277 SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf); 2278 Line = CppHashInfo.LineNumber - 1 + (Line - CppHashLocLineNo); 2279 } 2280 2281 getStreamer().emitDwarfLocDirective( 2282 getContext().getGenDwarfFileNumber(), Line, 0, 2283 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0, 2284 StringRef()); 2285 } 2286 2287 // If parsing succeeded, match the instruction. 2288 if (!ParseHadError) { 2289 uint64_t ErrorInfo; 2290 if (getTargetParser().MatchAndEmitInstruction( 2291 IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo, 2292 getTargetParser().isParsingMSInlineAsm())) 2293 return true; 2294 } 2295 return false; 2296 } 2297 2298 // Parse and erase curly braces marking block start/end 2299 bool 2300 AsmParser::parseCurlyBlockScope(SmallVectorImpl<AsmRewrite> &AsmStrRewrites) { 2301 // Identify curly brace marking block start/end 2302 if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly)) 2303 return false; 2304 2305 SMLoc StartLoc = Lexer.getLoc(); 2306 Lex(); // Eat the brace 2307 if (Lexer.is(AsmToken::EndOfStatement)) 2308 Lex(); // Eat EndOfStatement following the brace 2309 2310 // Erase the block start/end brace from the output asm string 2311 AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() - 2312 StartLoc.getPointer()); 2313 return true; 2314 } 2315 2316 /// parseCppHashLineFilenameComment as this: 2317 /// ::= # number "filename" 2318 bool AsmParser::parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo) { 2319 Lex(); // Eat the hash token. 2320 // Lexer only ever emits HashDirective if it fully formed if it's 2321 // done the checking already so this is an internal error. 2322 assert(getTok().is(AsmToken::Integer) && 2323 "Lexing Cpp line comment: Expected Integer"); 2324 int64_t LineNumber = getTok().getIntVal(); 2325 Lex(); 2326 assert(getTok().is(AsmToken::String) && 2327 "Lexing Cpp line comment: Expected String"); 2328 StringRef Filename = getTok().getString(); 2329 Lex(); 2330 2331 if (!SaveLocInfo) 2332 return false; 2333 2334 // Get rid of the enclosing quotes. 2335 Filename = Filename.substr(1, Filename.size() - 2); 2336 2337 // Save the SMLoc, Filename and LineNumber for later use by diagnostics 2338 // and possibly DWARF file info. 2339 CppHashInfo.Loc = L; 2340 CppHashInfo.Filename = Filename; 2341 CppHashInfo.LineNumber = LineNumber; 2342 CppHashInfo.Buf = CurBuffer; 2343 if (FirstCppHashFilename.empty()) 2344 FirstCppHashFilename = Filename; 2345 return false; 2346 } 2347 2348 /// will use the last parsed cpp hash line filename comment 2349 /// for the Filename and LineNo if any in the diagnostic. 2350 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) { 2351 const AsmParser *Parser = static_cast<const AsmParser *>(Context); 2352 raw_ostream &OS = errs(); 2353 2354 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr(); 2355 SMLoc DiagLoc = Diag.getLoc(); 2356 unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 2357 unsigned CppHashBuf = 2358 Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashInfo.Loc); 2359 2360 // Like SourceMgr::printMessage() we need to print the include stack if any 2361 // before printing the message. 2362 unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 2363 if (!Parser->SavedDiagHandler && DiagCurBuffer && 2364 DiagCurBuffer != DiagSrcMgr.getMainFileID()) { 2365 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer); 2366 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS); 2367 } 2368 2369 // If we have not parsed a cpp hash line filename comment or the source 2370 // manager changed or buffer changed (like in a nested include) then just 2371 // print the normal diagnostic using its Filename and LineNo. 2372 if (!Parser->CppHashInfo.LineNumber || &DiagSrcMgr != &Parser->SrcMgr || 2373 DiagBuf != CppHashBuf) { 2374 if (Parser->SavedDiagHandler) 2375 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); 2376 else 2377 Diag.print(nullptr, OS); 2378 return; 2379 } 2380 2381 // Use the CppHashFilename and calculate a line number based on the 2382 // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc 2383 // for the diagnostic. 2384 const std::string &Filename = std::string(Parser->CppHashInfo.Filename); 2385 2386 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf); 2387 int CppHashLocLineNo = 2388 Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf); 2389 int LineNo = 2390 Parser->CppHashInfo.LineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo); 2391 2392 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo, 2393 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(), 2394 Diag.getLineContents(), Diag.getRanges()); 2395 2396 if (Parser->SavedDiagHandler) 2397 Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext); 2398 else 2399 NewDiag.print(nullptr, OS); 2400 } 2401 2402 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The 2403 // difference being that that function accepts '@' as part of identifiers and 2404 // we can't do that. AsmLexer.cpp should probably be changed to handle 2405 // '@' as a special case when needed. 2406 static bool isIdentifierChar(char c) { 2407 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' || 2408 c == '.'; 2409 } 2410 2411 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body, 2412 ArrayRef<MCAsmMacroParameter> Parameters, 2413 ArrayRef<MCAsmMacroArgument> A, 2414 bool EnableAtPseudoVariable, SMLoc L) { 2415 unsigned NParameters = Parameters.size(); 2416 bool HasVararg = NParameters ? Parameters.back().Vararg : false; 2417 if ((!IsDarwin || NParameters != 0) && NParameters != A.size()) 2418 return Error(L, "Wrong number of arguments"); 2419 2420 // A macro without parameters is handled differently on Darwin: 2421 // gas accepts no arguments and does no substitutions 2422 while (!Body.empty()) { 2423 // Scan for the next substitution. 2424 std::size_t End = Body.size(), Pos = 0; 2425 for (; Pos != End; ++Pos) { 2426 // Check for a substitution or escape. 2427 if (IsDarwin && !NParameters) { 2428 // This macro has no parameters, look for $0, $1, etc. 2429 if (Body[Pos] != '$' || Pos + 1 == End) 2430 continue; 2431 2432 char Next = Body[Pos + 1]; 2433 if (Next == '$' || Next == 'n' || 2434 isdigit(static_cast<unsigned char>(Next))) 2435 break; 2436 } else { 2437 // This macro has parameters, look for \foo, \bar, etc. 2438 if (Body[Pos] == '\\' && Pos + 1 != End) 2439 break; 2440 } 2441 } 2442 2443 // Add the prefix. 2444 OS << Body.slice(0, Pos); 2445 2446 // Check if we reached the end. 2447 if (Pos == End) 2448 break; 2449 2450 if (IsDarwin && !NParameters) { 2451 switch (Body[Pos + 1]) { 2452 // $$ => $ 2453 case '$': 2454 OS << '$'; 2455 break; 2456 2457 // $n => number of arguments 2458 case 'n': 2459 OS << A.size(); 2460 break; 2461 2462 // $[0-9] => argument 2463 default: { 2464 // Missing arguments are ignored. 2465 unsigned Index = Body[Pos + 1] - '0'; 2466 if (Index >= A.size()) 2467 break; 2468 2469 // Otherwise substitute with the token values, with spaces eliminated. 2470 for (const AsmToken &Token : A[Index]) 2471 OS << Token.getString(); 2472 break; 2473 } 2474 } 2475 Pos += 2; 2476 } else { 2477 unsigned I = Pos + 1; 2478 2479 // Check for the \@ pseudo-variable. 2480 if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End) 2481 ++I; 2482 else 2483 while (isIdentifierChar(Body[I]) && I + 1 != End) 2484 ++I; 2485 2486 const char *Begin = Body.data() + Pos + 1; 2487 StringRef Argument(Begin, I - (Pos + 1)); 2488 unsigned Index = 0; 2489 2490 if (Argument == "@") { 2491 OS << NumOfMacroInstantiations; 2492 Pos += 2; 2493 } else { 2494 for (; Index < NParameters; ++Index) 2495 if (Parameters[Index].Name == Argument) 2496 break; 2497 2498 if (Index == NParameters) { 2499 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 2500 Pos += 3; 2501 else { 2502 OS << '\\' << Argument; 2503 Pos = I; 2504 } 2505 } else { 2506 bool VarargParameter = HasVararg && Index == (NParameters - 1); 2507 for (const AsmToken &Token : A[Index]) 2508 // For altmacro mode, you can write '%expr'. 2509 // The prefix '%' evaluates the expression 'expr' 2510 // and uses the result as a string (e.g. replace %(1+2) with the 2511 // string "3"). 2512 // Here, we identify the integer token which is the result of the 2513 // absolute expression evaluation and replace it with its string 2514 // representation. 2515 if (AltMacroMode && Token.getString().front() == '%' && 2516 Token.is(AsmToken::Integer)) 2517 // Emit an integer value to the buffer. 2518 OS << Token.getIntVal(); 2519 // Only Token that was validated as a string and begins with '<' 2520 // is considered altMacroString!!! 2521 else if (AltMacroMode && Token.getString().front() == '<' && 2522 Token.is(AsmToken::String)) { 2523 OS << angleBracketString(Token.getStringContents()); 2524 } 2525 // We expect no quotes around the string's contents when 2526 // parsing for varargs. 2527 else if (Token.isNot(AsmToken::String) || VarargParameter) 2528 OS << Token.getString(); 2529 else 2530 OS << Token.getStringContents(); 2531 2532 Pos += 1 + Argument.size(); 2533 } 2534 } 2535 } 2536 // Update the scan point. 2537 Body = Body.substr(Pos); 2538 } 2539 2540 return false; 2541 } 2542 2543 static bool isOperator(AsmToken::TokenKind kind) { 2544 switch (kind) { 2545 default: 2546 return false; 2547 case AsmToken::Plus: 2548 case AsmToken::Minus: 2549 case AsmToken::Tilde: 2550 case AsmToken::Slash: 2551 case AsmToken::Star: 2552 case AsmToken::Dot: 2553 case AsmToken::Equal: 2554 case AsmToken::EqualEqual: 2555 case AsmToken::Pipe: 2556 case AsmToken::PipePipe: 2557 case AsmToken::Caret: 2558 case AsmToken::Amp: 2559 case AsmToken::AmpAmp: 2560 case AsmToken::Exclaim: 2561 case AsmToken::ExclaimEqual: 2562 case AsmToken::Less: 2563 case AsmToken::LessEqual: 2564 case AsmToken::LessLess: 2565 case AsmToken::LessGreater: 2566 case AsmToken::Greater: 2567 case AsmToken::GreaterEqual: 2568 case AsmToken::GreaterGreater: 2569 return true; 2570 } 2571 } 2572 2573 namespace { 2574 2575 class AsmLexerSkipSpaceRAII { 2576 public: 2577 AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) { 2578 Lexer.setSkipSpace(SkipSpace); 2579 } 2580 2581 ~AsmLexerSkipSpaceRAII() { 2582 Lexer.setSkipSpace(true); 2583 } 2584 2585 private: 2586 AsmLexer &Lexer; 2587 }; 2588 2589 } // end anonymous namespace 2590 2591 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) { 2592 2593 if (Vararg) { 2594 if (Lexer.isNot(AsmToken::EndOfStatement)) { 2595 StringRef Str = parseStringToEndOfStatement(); 2596 MA.emplace_back(AsmToken::String, Str); 2597 } 2598 return false; 2599 } 2600 2601 unsigned ParenLevel = 0; 2602 2603 // Darwin doesn't use spaces to delmit arguments. 2604 AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin); 2605 2606 bool SpaceEaten; 2607 2608 while (true) { 2609 SpaceEaten = false; 2610 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) 2611 return TokError("unexpected token in macro instantiation"); 2612 2613 if (ParenLevel == 0) { 2614 2615 if (Lexer.is(AsmToken::Comma)) 2616 break; 2617 2618 if (Lexer.is(AsmToken::Space)) { 2619 SpaceEaten = true; 2620 Lexer.Lex(); // Eat spaces 2621 } 2622 2623 // Spaces can delimit parameters, but could also be part an expression. 2624 // If the token after a space is an operator, add the token and the next 2625 // one into this argument 2626 if (!IsDarwin) { 2627 if (isOperator(Lexer.getKind())) { 2628 MA.push_back(getTok()); 2629 Lexer.Lex(); 2630 2631 // Whitespace after an operator can be ignored. 2632 if (Lexer.is(AsmToken::Space)) 2633 Lexer.Lex(); 2634 2635 continue; 2636 } 2637 } 2638 if (SpaceEaten) 2639 break; 2640 } 2641 2642 // handleMacroEntry relies on not advancing the lexer here 2643 // to be able to fill in the remaining default parameter values 2644 if (Lexer.is(AsmToken::EndOfStatement)) 2645 break; 2646 2647 // Adjust the current parentheses level. 2648 if (Lexer.is(AsmToken::LParen)) 2649 ++ParenLevel; 2650 else if (Lexer.is(AsmToken::RParen) && ParenLevel) 2651 --ParenLevel; 2652 2653 // Append the token to the current argument list. 2654 MA.push_back(getTok()); 2655 Lexer.Lex(); 2656 } 2657 2658 if (ParenLevel != 0) 2659 return TokError("unbalanced parentheses in macro argument"); 2660 return false; 2661 } 2662 2663 // Parse the macro instantiation arguments. 2664 bool AsmParser::parseMacroArguments(const MCAsmMacro *M, 2665 MCAsmMacroArguments &A) { 2666 const unsigned NParameters = M ? M->Parameters.size() : 0; 2667 bool NamedParametersFound = false; 2668 SmallVector<SMLoc, 4> FALocs; 2669 2670 A.resize(NParameters); 2671 FALocs.resize(NParameters); 2672 2673 // Parse two kinds of macro invocations: 2674 // - macros defined without any parameters accept an arbitrary number of them 2675 // - macros defined with parameters accept at most that many of them 2676 bool HasVararg = NParameters ? M->Parameters.back().Vararg : false; 2677 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters; 2678 ++Parameter) { 2679 SMLoc IDLoc = Lexer.getLoc(); 2680 MCAsmMacroParameter FA; 2681 2682 if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) { 2683 if (parseIdentifier(FA.Name)) 2684 return Error(IDLoc, "invalid argument identifier for formal argument"); 2685 2686 if (Lexer.isNot(AsmToken::Equal)) 2687 return TokError("expected '=' after formal parameter identifier"); 2688 2689 Lex(); 2690 2691 NamedParametersFound = true; 2692 } 2693 bool Vararg = HasVararg && Parameter == (NParameters - 1); 2694 2695 if (NamedParametersFound && FA.Name.empty()) 2696 return Error(IDLoc, "cannot mix positional and keyword arguments"); 2697 2698 SMLoc StrLoc = Lexer.getLoc(); 2699 SMLoc EndLoc; 2700 if (AltMacroMode && Lexer.is(AsmToken::Percent)) { 2701 const MCExpr *AbsoluteExp; 2702 int64_t Value; 2703 /// Eat '%' 2704 Lex(); 2705 if (parseExpression(AbsoluteExp, EndLoc)) 2706 return false; 2707 if (!AbsoluteExp->evaluateAsAbsolute(Value, 2708 getStreamer().getAssemblerPtr())) 2709 return Error(StrLoc, "expected absolute expression"); 2710 const char *StrChar = StrLoc.getPointer(); 2711 const char *EndChar = EndLoc.getPointer(); 2712 AsmToken newToken(AsmToken::Integer, 2713 StringRef(StrChar, EndChar - StrChar), Value); 2714 FA.Value.push_back(newToken); 2715 } else if (AltMacroMode && Lexer.is(AsmToken::Less) && 2716 isAngleBracketString(StrLoc, EndLoc)) { 2717 const char *StrChar = StrLoc.getPointer(); 2718 const char *EndChar = EndLoc.getPointer(); 2719 jumpToLoc(EndLoc, CurBuffer); 2720 /// Eat from '<' to '>' 2721 Lex(); 2722 AsmToken newToken(AsmToken::String, 2723 StringRef(StrChar, EndChar - StrChar)); 2724 FA.Value.push_back(newToken); 2725 } else if(parseMacroArgument(FA.Value, Vararg)) 2726 return true; 2727 2728 unsigned PI = Parameter; 2729 if (!FA.Name.empty()) { 2730 unsigned FAI = 0; 2731 for (FAI = 0; FAI < NParameters; ++FAI) 2732 if (M->Parameters[FAI].Name == FA.Name) 2733 break; 2734 2735 if (FAI >= NParameters) { 2736 assert(M && "expected macro to be defined"); 2737 return Error(IDLoc, "parameter named '" + FA.Name + 2738 "' does not exist for macro '" + M->Name + "'"); 2739 } 2740 PI = FAI; 2741 } 2742 2743 if (!FA.Value.empty()) { 2744 if (A.size() <= PI) 2745 A.resize(PI + 1); 2746 A[PI] = FA.Value; 2747 2748 if (FALocs.size() <= PI) 2749 FALocs.resize(PI + 1); 2750 2751 FALocs[PI] = Lexer.getLoc(); 2752 } 2753 2754 // At the end of the statement, fill in remaining arguments that have 2755 // default values. If there aren't any, then the next argument is 2756 // required but missing 2757 if (Lexer.is(AsmToken::EndOfStatement)) { 2758 bool Failure = false; 2759 for (unsigned FAI = 0; FAI < NParameters; ++FAI) { 2760 if (A[FAI].empty()) { 2761 if (M->Parameters[FAI].Required) { 2762 Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(), 2763 "missing value for required parameter " 2764 "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'"); 2765 Failure = true; 2766 } 2767 2768 if (!M->Parameters[FAI].Value.empty()) 2769 A[FAI] = M->Parameters[FAI].Value; 2770 } 2771 } 2772 return Failure; 2773 } 2774 2775 if (Lexer.is(AsmToken::Comma)) 2776 Lex(); 2777 } 2778 2779 return TokError("too many positional arguments"); 2780 } 2781 2782 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) { 2783 // Arbitrarily limit macro nesting depth (default matches 'as'). We can 2784 // eliminate this, although we should protect against infinite loops. 2785 unsigned MaxNestingDepth = AsmMacroMaxNestingDepth; 2786 if (ActiveMacros.size() == MaxNestingDepth) { 2787 std::ostringstream MaxNestingDepthError; 2788 MaxNestingDepthError << "macros cannot be nested more than " 2789 << MaxNestingDepth << " levels deep." 2790 << " Use -asm-macro-max-nesting-depth to increase " 2791 "this limit."; 2792 return TokError(MaxNestingDepthError.str()); 2793 } 2794 2795 MCAsmMacroArguments A; 2796 if (parseMacroArguments(M, A)) 2797 return true; 2798 2799 // Macro instantiation is lexical, unfortunately. We construct a new buffer 2800 // to hold the macro body with substitutions. 2801 SmallString<256> Buf; 2802 StringRef Body = M->Body; 2803 raw_svector_ostream OS(Buf); 2804 2805 if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc())) 2806 return true; 2807 2808 // We include the .endmacro in the buffer as our cue to exit the macro 2809 // instantiation. 2810 OS << ".endmacro\n"; 2811 2812 std::unique_ptr<MemoryBuffer> Instantiation = 2813 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 2814 2815 // Create the macro instantiation object and add to the current macro 2816 // instantiation stack. 2817 MacroInstantiation *MI = new MacroInstantiation{ 2818 NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()}; 2819 ActiveMacros.push_back(MI); 2820 2821 ++NumOfMacroInstantiations; 2822 2823 // Jump to the macro instantiation and prime the lexer. 2824 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 2825 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 2826 Lex(); 2827 2828 return false; 2829 } 2830 2831 void AsmParser::handleMacroExit() { 2832 // Jump to the EndOfStatement we should return to, and consume it. 2833 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer); 2834 Lex(); 2835 2836 // Pop the instantiation entry. 2837 delete ActiveMacros.back(); 2838 ActiveMacros.pop_back(); 2839 } 2840 2841 bool AsmParser::parseAssignment(StringRef Name, bool allow_redef, 2842 bool NoDeadStrip) { 2843 MCSymbol *Sym; 2844 const MCExpr *Value; 2845 if (MCParserUtils::parseAssignmentExpression(Name, allow_redef, *this, Sym, 2846 Value)) 2847 return true; 2848 2849 if (!Sym) { 2850 // In the case where we parse an expression starting with a '.', we will 2851 // not generate an error, nor will we create a symbol. In this case we 2852 // should just return out. 2853 return false; 2854 } 2855 2856 // Do the assignment. 2857 Out.emitAssignment(Sym, Value); 2858 if (NoDeadStrip) 2859 Out.emitSymbolAttribute(Sym, MCSA_NoDeadStrip); 2860 2861 return false; 2862 } 2863 2864 /// parseIdentifier: 2865 /// ::= identifier 2866 /// ::= string 2867 bool AsmParser::parseIdentifier(StringRef &Res) { 2868 // The assembler has relaxed rules for accepting identifiers, in particular we 2869 // allow things like '.globl $foo' and '.def @feat.00', which would normally be 2870 // separate tokens. At this level, we have already lexed so we cannot (currently) 2871 // handle this as a context dependent token, instead we detect adjacent tokens 2872 // and return the combined identifier. 2873 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) { 2874 SMLoc PrefixLoc = getLexer().getLoc(); 2875 2876 // Consume the prefix character, and check for a following identifier. 2877 2878 AsmToken Buf[1]; 2879 Lexer.peekTokens(Buf, false); 2880 2881 if (Buf[0].isNot(AsmToken::Identifier) && Buf[0].isNot(AsmToken::Integer)) 2882 return true; 2883 2884 // We have a '$' or '@' followed by an identifier or integer token, make 2885 // sure they are adjacent. 2886 if (PrefixLoc.getPointer() + 1 != Buf[0].getLoc().getPointer()) 2887 return true; 2888 2889 // eat $ or @ 2890 Lexer.Lex(); // Lexer's Lex guarantees consecutive token. 2891 // Construct the joined identifier and consume the token. 2892 Res = StringRef(PrefixLoc.getPointer(), getTok().getString().size() + 1); 2893 Lex(); // Parser Lex to maintain invariants. 2894 return false; 2895 } 2896 2897 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String)) 2898 return true; 2899 2900 Res = getTok().getIdentifier(); 2901 2902 Lex(); // Consume the identifier token. 2903 2904 return false; 2905 } 2906 2907 /// parseDirectiveSet: 2908 /// ::= .equ identifier ',' expression 2909 /// ::= .equiv identifier ',' expression 2910 /// ::= .set identifier ',' expression 2911 bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) { 2912 StringRef Name; 2913 if (check(parseIdentifier(Name), "expected identifier") || 2914 parseToken(AsmToken::Comma) || parseAssignment(Name, allow_redef, true)) 2915 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive"); 2916 return false; 2917 } 2918 2919 bool AsmParser::parseEscapedString(std::string &Data) { 2920 if (check(getTok().isNot(AsmToken::String), "expected string")) 2921 return true; 2922 2923 Data = ""; 2924 StringRef Str = getTok().getStringContents(); 2925 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 2926 if (Str[i] != '\\') { 2927 Data += Str[i]; 2928 continue; 2929 } 2930 2931 // Recognize escaped characters. Note that this escape semantics currently 2932 // loosely follows Darwin 'as'. 2933 ++i; 2934 if (i == e) 2935 return TokError("unexpected backslash at end of string"); 2936 2937 // Recognize hex sequences similarly to GNU 'as'. 2938 if (Str[i] == 'x' || Str[i] == 'X') { 2939 size_t length = Str.size(); 2940 if (i + 1 >= length || !isHexDigit(Str[i + 1])) 2941 return TokError("invalid hexadecimal escape sequence"); 2942 2943 // Consume hex characters. GNU 'as' reads all hexadecimal characters and 2944 // then truncates to the lower 16 bits. Seems reasonable. 2945 unsigned Value = 0; 2946 while (i + 1 < length && isHexDigit(Str[i + 1])) 2947 Value = Value * 16 + hexDigitValue(Str[++i]); 2948 2949 Data += (unsigned char)(Value & 0xFF); 2950 continue; 2951 } 2952 2953 // Recognize octal sequences. 2954 if ((unsigned)(Str[i] - '0') <= 7) { 2955 // Consume up to three octal characters. 2956 unsigned Value = Str[i] - '0'; 2957 2958 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 2959 ++i; 2960 Value = Value * 8 + (Str[i] - '0'); 2961 2962 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 2963 ++i; 2964 Value = Value * 8 + (Str[i] - '0'); 2965 } 2966 } 2967 2968 if (Value > 255) 2969 return TokError("invalid octal escape sequence (out of range)"); 2970 2971 Data += (unsigned char)Value; 2972 continue; 2973 } 2974 2975 // Otherwise recognize individual escapes. 2976 switch (Str[i]) { 2977 default: 2978 // Just reject invalid escape sequences for now. 2979 return TokError("invalid escape sequence (unrecognized character)"); 2980 2981 case 'b': Data += '\b'; break; 2982 case 'f': Data += '\f'; break; 2983 case 'n': Data += '\n'; break; 2984 case 'r': Data += '\r'; break; 2985 case 't': Data += '\t'; break; 2986 case '"': Data += '"'; break; 2987 case '\\': Data += '\\'; break; 2988 } 2989 } 2990 2991 Lex(); 2992 return false; 2993 } 2994 2995 bool AsmParser::parseAngleBracketString(std::string &Data) { 2996 SMLoc EndLoc, StartLoc = getTok().getLoc(); 2997 if (isAngleBracketString(StartLoc, EndLoc)) { 2998 const char *StartChar = StartLoc.getPointer() + 1; 2999 const char *EndChar = EndLoc.getPointer() - 1; 3000 jumpToLoc(EndLoc, CurBuffer); 3001 /// Eat from '<' to '>' 3002 Lex(); 3003 3004 Data = angleBracketString(StringRef(StartChar, EndChar - StartChar)); 3005 return false; 3006 } 3007 return true; 3008 } 3009 3010 /// parseDirectiveAscii: 3011 // ::= .ascii [ "string"+ ( , "string"+ )* ] 3012 /// ::= ( .asciz | .string ) [ "string" ( , "string" )* ] 3013 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) { 3014 auto parseOp = [&]() -> bool { 3015 std::string Data; 3016 if (checkForValidSection()) 3017 return true; 3018 // Only support spaces as separators for .ascii directive for now. See the 3019 // discusssion at https://reviews.llvm.org/D91460 for more details. 3020 do { 3021 if (parseEscapedString(Data)) 3022 return true; 3023 getStreamer().emitBytes(Data); 3024 } while (!ZeroTerminated && getTok().is(AsmToken::String)); 3025 if (ZeroTerminated) 3026 getStreamer().emitBytes(StringRef("\0", 1)); 3027 return false; 3028 }; 3029 3030 if (parseMany(parseOp)) 3031 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive"); 3032 return false; 3033 } 3034 3035 /// parseDirectiveReloc 3036 /// ::= .reloc expression , identifier [ , expression ] 3037 bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) { 3038 const MCExpr *Offset; 3039 const MCExpr *Expr = nullptr; 3040 SMLoc OffsetLoc = Lexer.getTok().getLoc(); 3041 3042 if (parseExpression(Offset)) 3043 return true; 3044 if (parseToken(AsmToken::Comma, "expected comma") || 3045 check(getTok().isNot(AsmToken::Identifier), "expected relocation name")) 3046 return true; 3047 3048 SMLoc NameLoc = Lexer.getTok().getLoc(); 3049 StringRef Name = Lexer.getTok().getIdentifier(); 3050 Lex(); 3051 3052 if (Lexer.is(AsmToken::Comma)) { 3053 Lex(); 3054 SMLoc ExprLoc = Lexer.getLoc(); 3055 if (parseExpression(Expr)) 3056 return true; 3057 3058 MCValue Value; 3059 if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr)) 3060 return Error(ExprLoc, "expression must be relocatable"); 3061 } 3062 3063 if (parseToken(AsmToken::EndOfStatement, 3064 "unexpected token in .reloc directive")) 3065 return true; 3066 3067 const MCTargetAsmParser &MCT = getTargetParser(); 3068 const MCSubtargetInfo &STI = MCT.getSTI(); 3069 if (Optional<std::pair<bool, std::string>> Err = 3070 getStreamer().emitRelocDirective(*Offset, Name, Expr, DirectiveLoc, 3071 STI)) 3072 return Error(Err->first ? NameLoc : OffsetLoc, Err->second); 3073 3074 return false; 3075 } 3076 3077 /// parseDirectiveValue 3078 /// ::= (.byte | .short | ... ) [ expression (, expression)* ] 3079 bool AsmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) { 3080 auto parseOp = [&]() -> bool { 3081 const MCExpr *Value; 3082 SMLoc ExprLoc = getLexer().getLoc(); 3083 if (checkForValidSection() || parseExpression(Value)) 3084 return true; 3085 // Special case constant expressions to match code generator. 3086 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3087 assert(Size <= 8 && "Invalid size"); 3088 uint64_t IntValue = MCE->getValue(); 3089 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 3090 return Error(ExprLoc, "out of range literal value"); 3091 getStreamer().emitIntValue(IntValue, Size); 3092 } else 3093 getStreamer().emitValue(Value, Size, ExprLoc); 3094 return false; 3095 }; 3096 3097 if (parseMany(parseOp)) 3098 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive"); 3099 return false; 3100 } 3101 3102 static bool parseHexOcta(AsmParser &Asm, uint64_t &hi, uint64_t &lo) { 3103 if (Asm.getTok().isNot(AsmToken::Integer) && 3104 Asm.getTok().isNot(AsmToken::BigNum)) 3105 return Asm.TokError("unknown token in expression"); 3106 SMLoc ExprLoc = Asm.getTok().getLoc(); 3107 APInt IntValue = Asm.getTok().getAPIntVal(); 3108 Asm.Lex(); 3109 if (!IntValue.isIntN(128)) 3110 return Asm.Error(ExprLoc, "out of range literal value"); 3111 if (!IntValue.isIntN(64)) { 3112 hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue(); 3113 lo = IntValue.getLoBits(64).getZExtValue(); 3114 } else { 3115 hi = 0; 3116 lo = IntValue.getZExtValue(); 3117 } 3118 return false; 3119 } 3120 3121 /// ParseDirectiveOctaValue 3122 /// ::= .octa [ hexconstant (, hexconstant)* ] 3123 3124 bool AsmParser::parseDirectiveOctaValue(StringRef IDVal) { 3125 auto parseOp = [&]() -> bool { 3126 if (checkForValidSection()) 3127 return true; 3128 uint64_t hi, lo; 3129 if (parseHexOcta(*this, hi, lo)) 3130 return true; 3131 if (MAI.isLittleEndian()) { 3132 getStreamer().emitInt64(lo); 3133 getStreamer().emitInt64(hi); 3134 } else { 3135 getStreamer().emitInt64(hi); 3136 getStreamer().emitInt64(lo); 3137 } 3138 return false; 3139 }; 3140 3141 if (parseMany(parseOp)) 3142 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive"); 3143 return false; 3144 } 3145 3146 bool AsmParser::parseRealValue(const fltSemantics &Semantics, APInt &Res) { 3147 // We don't truly support arithmetic on floating point expressions, so we 3148 // have to manually parse unary prefixes. 3149 bool IsNeg = false; 3150 if (getLexer().is(AsmToken::Minus)) { 3151 Lexer.Lex(); 3152 IsNeg = true; 3153 } else if (getLexer().is(AsmToken::Plus)) 3154 Lexer.Lex(); 3155 3156 if (Lexer.is(AsmToken::Error)) 3157 return TokError(Lexer.getErr()); 3158 if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) && 3159 Lexer.isNot(AsmToken::Identifier)) 3160 return TokError("unexpected token in directive"); 3161 3162 // Convert to an APFloat. 3163 APFloat Value(Semantics); 3164 StringRef IDVal = getTok().getString(); 3165 if (getLexer().is(AsmToken::Identifier)) { 3166 if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf")) 3167 Value = APFloat::getInf(Semantics); 3168 else if (!IDVal.compare_lower("nan")) 3169 Value = APFloat::getNaN(Semantics, false, ~0); 3170 else 3171 return TokError("invalid floating point literal"); 3172 } else if (errorToBool( 3173 Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) 3174 .takeError())) 3175 return TokError("invalid floating point literal"); 3176 if (IsNeg) 3177 Value.changeSign(); 3178 3179 // Consume the numeric token. 3180 Lex(); 3181 3182 Res = Value.bitcastToAPInt(); 3183 3184 return false; 3185 } 3186 3187 /// parseDirectiveRealValue 3188 /// ::= (.single | .double) [ expression (, expression)* ] 3189 bool AsmParser::parseDirectiveRealValue(StringRef IDVal, 3190 const fltSemantics &Semantics) { 3191 auto parseOp = [&]() -> bool { 3192 APInt AsInt; 3193 if (checkForValidSection() || parseRealValue(Semantics, AsInt)) 3194 return true; 3195 getStreamer().emitIntValue(AsInt.getLimitedValue(), 3196 AsInt.getBitWidth() / 8); 3197 return false; 3198 }; 3199 3200 if (parseMany(parseOp)) 3201 return addErrorSuffix(" in '" + Twine(IDVal) + "' directive"); 3202 return false; 3203 } 3204 3205 /// parseDirectiveZero 3206 /// ::= .zero expression 3207 bool AsmParser::parseDirectiveZero() { 3208 SMLoc NumBytesLoc = Lexer.getLoc(); 3209 const MCExpr *NumBytes; 3210 if (checkForValidSection() || parseExpression(NumBytes)) 3211 return true; 3212 3213 int64_t Val = 0; 3214 if (getLexer().is(AsmToken::Comma)) { 3215 Lex(); 3216 if (parseAbsoluteExpression(Val)) 3217 return true; 3218 } 3219 3220 if (parseToken(AsmToken::EndOfStatement, 3221 "unexpected token in '.zero' directive")) 3222 return true; 3223 getStreamer().emitFill(*NumBytes, Val, NumBytesLoc); 3224 3225 return false; 3226 } 3227 3228 /// parseDirectiveFill 3229 /// ::= .fill expression [ , expression [ , expression ] ] 3230 bool AsmParser::parseDirectiveFill() { 3231 SMLoc NumValuesLoc = Lexer.getLoc(); 3232 const MCExpr *NumValues; 3233 if (checkForValidSection() || parseExpression(NumValues)) 3234 return true; 3235 3236 int64_t FillSize = 1; 3237 int64_t FillExpr = 0; 3238 3239 SMLoc SizeLoc, ExprLoc; 3240 3241 if (parseOptionalToken(AsmToken::Comma)) { 3242 SizeLoc = getTok().getLoc(); 3243 if (parseAbsoluteExpression(FillSize)) 3244 return true; 3245 if (parseOptionalToken(AsmToken::Comma)) { 3246 ExprLoc = getTok().getLoc(); 3247 if (parseAbsoluteExpression(FillExpr)) 3248 return true; 3249 } 3250 } 3251 if (parseToken(AsmToken::EndOfStatement, 3252 "unexpected token in '.fill' directive")) 3253 return true; 3254 3255 if (FillSize < 0) { 3256 Warning(SizeLoc, "'.fill' directive with negative size has no effect"); 3257 return false; 3258 } 3259 if (FillSize > 8) { 3260 Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8"); 3261 FillSize = 8; 3262 } 3263 3264 if (!isUInt<32>(FillExpr) && FillSize > 4) 3265 Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits"); 3266 3267 getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc); 3268 3269 return false; 3270 } 3271 3272 /// parseDirectiveOrg 3273 /// ::= .org expression [ , expression ] 3274 bool AsmParser::parseDirectiveOrg() { 3275 const MCExpr *Offset; 3276 SMLoc OffsetLoc = Lexer.getLoc(); 3277 if (checkForValidSection() || parseExpression(Offset)) 3278 return true; 3279 3280 // Parse optional fill expression. 3281 int64_t FillExpr = 0; 3282 if (parseOptionalToken(AsmToken::Comma)) 3283 if (parseAbsoluteExpression(FillExpr)) 3284 return addErrorSuffix(" in '.org' directive"); 3285 if (parseToken(AsmToken::EndOfStatement)) 3286 return addErrorSuffix(" in '.org' directive"); 3287 3288 getStreamer().emitValueToOffset(Offset, FillExpr, OffsetLoc); 3289 return false; 3290 } 3291 3292 /// parseDirectiveAlign 3293 /// ::= {.align, ...} expression [ , expression [ , expression ]] 3294 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) { 3295 SMLoc AlignmentLoc = getLexer().getLoc(); 3296 int64_t Alignment; 3297 SMLoc MaxBytesLoc; 3298 bool HasFillExpr = false; 3299 int64_t FillExpr = 0; 3300 int64_t MaxBytesToFill = 0; 3301 3302 auto parseAlign = [&]() -> bool { 3303 if (parseAbsoluteExpression(Alignment)) 3304 return true; 3305 if (parseOptionalToken(AsmToken::Comma)) { 3306 // The fill expression can be omitted while specifying a maximum number of 3307 // alignment bytes, e.g: 3308 // .align 3,,4 3309 if (getTok().isNot(AsmToken::Comma)) { 3310 HasFillExpr = true; 3311 if (parseAbsoluteExpression(FillExpr)) 3312 return true; 3313 } 3314 if (parseOptionalToken(AsmToken::Comma)) 3315 if (parseTokenLoc(MaxBytesLoc) || 3316 parseAbsoluteExpression(MaxBytesToFill)) 3317 return true; 3318 } 3319 return parseToken(AsmToken::EndOfStatement); 3320 }; 3321 3322 if (checkForValidSection()) 3323 return addErrorSuffix(" in directive"); 3324 // Ignore empty '.p2align' directives for GNU-as compatibility 3325 if (IsPow2 && (ValueSize == 1) && getTok().is(AsmToken::EndOfStatement)) { 3326 Warning(AlignmentLoc, "p2align directive with no operand(s) is ignored"); 3327 return parseToken(AsmToken::EndOfStatement); 3328 } 3329 if (parseAlign()) 3330 return addErrorSuffix(" in directive"); 3331 3332 // Always emit an alignment here even if we thrown an error. 3333 bool ReturnVal = false; 3334 3335 // Compute alignment in bytes. 3336 if (IsPow2) { 3337 // FIXME: Diagnose overflow. 3338 if (Alignment >= 32) { 3339 ReturnVal |= Error(AlignmentLoc, "invalid alignment value"); 3340 Alignment = 31; 3341 } 3342 3343 Alignment = 1ULL << Alignment; 3344 } else { 3345 // Reject alignments that aren't either a power of two or zero, 3346 // for gas compatibility. Alignment of zero is silently rounded 3347 // up to one. 3348 if (Alignment == 0) 3349 Alignment = 1; 3350 if (!isPowerOf2_64(Alignment)) 3351 ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2"); 3352 if (!isUInt<32>(Alignment)) 3353 ReturnVal |= Error(AlignmentLoc, "alignment must be smaller than 2**32"); 3354 } 3355 3356 // Diagnose non-sensical max bytes to align. 3357 if (MaxBytesLoc.isValid()) { 3358 if (MaxBytesToFill < 1) { 3359 ReturnVal |= Error(MaxBytesLoc, 3360 "alignment directive can never be satisfied in this " 3361 "many bytes, ignoring maximum bytes expression"); 3362 MaxBytesToFill = 0; 3363 } 3364 3365 if (MaxBytesToFill >= Alignment) { 3366 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and " 3367 "has no effect"); 3368 MaxBytesToFill = 0; 3369 } 3370 } 3371 3372 // Check whether we should use optimal code alignment for this .align 3373 // directive. 3374 const MCSection *Section = getStreamer().getCurrentSectionOnly(); 3375 assert(Section && "must have section to emit alignment"); 3376 bool UseCodeAlign = Section->UseCodeAlign(); 3377 if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) && 3378 ValueSize == 1 && UseCodeAlign) { 3379 getStreamer().emitCodeAlignment(Alignment, MaxBytesToFill); 3380 } else { 3381 // FIXME: Target specific behavior about how the "extra" bytes are filled. 3382 getStreamer().emitValueToAlignment(Alignment, FillExpr, ValueSize, 3383 MaxBytesToFill); 3384 } 3385 3386 return ReturnVal; 3387 } 3388 3389 /// parseDirectiveFile 3390 /// ::= .file filename 3391 /// ::= .file number [directory] filename [md5 checksum] [source source-text] 3392 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) { 3393 // FIXME: I'm not sure what this is. 3394 int64_t FileNumber = -1; 3395 if (getLexer().is(AsmToken::Integer)) { 3396 FileNumber = getTok().getIntVal(); 3397 Lex(); 3398 3399 if (FileNumber < 0) 3400 return TokError("negative file number"); 3401 } 3402 3403 std::string Path; 3404 3405 // Usually the directory and filename together, otherwise just the directory. 3406 // Allow the strings to have escaped octal character sequence. 3407 if (check(getTok().isNot(AsmToken::String), 3408 "unexpected token in '.file' directive") || 3409 parseEscapedString(Path)) 3410 return true; 3411 3412 StringRef Directory; 3413 StringRef Filename; 3414 std::string FilenameData; 3415 if (getLexer().is(AsmToken::String)) { 3416 if (check(FileNumber == -1, 3417 "explicit path specified, but no file number") || 3418 parseEscapedString(FilenameData)) 3419 return true; 3420 Filename = FilenameData; 3421 Directory = Path; 3422 } else { 3423 Filename = Path; 3424 } 3425 3426 uint64_t MD5Hi, MD5Lo; 3427 bool HasMD5 = false; 3428 3429 Optional<StringRef> Source; 3430 bool HasSource = false; 3431 std::string SourceString; 3432 3433 while (!parseOptionalToken(AsmToken::EndOfStatement)) { 3434 StringRef Keyword; 3435 if (check(getTok().isNot(AsmToken::Identifier), 3436 "unexpected token in '.file' directive") || 3437 parseIdentifier(Keyword)) 3438 return true; 3439 if (Keyword == "md5") { 3440 HasMD5 = true; 3441 if (check(FileNumber == -1, 3442 "MD5 checksum specified, but no file number") || 3443 parseHexOcta(*this, MD5Hi, MD5Lo)) 3444 return true; 3445 } else if (Keyword == "source") { 3446 HasSource = true; 3447 if (check(FileNumber == -1, 3448 "source specified, but no file number") || 3449 check(getTok().isNot(AsmToken::String), 3450 "unexpected token in '.file' directive") || 3451 parseEscapedString(SourceString)) 3452 return true; 3453 } else { 3454 return TokError("unexpected token in '.file' directive"); 3455 } 3456 } 3457 3458 if (FileNumber == -1) { 3459 // Ignore the directive if there is no number and the target doesn't support 3460 // numberless .file directives. This allows some portability of assembler 3461 // between different object file formats. 3462 if (getContext().getAsmInfo()->hasSingleParameterDotFile()) 3463 getStreamer().emitFileDirective(Filename); 3464 } else { 3465 // In case there is a -g option as well as debug info from directive .file, 3466 // we turn off the -g option, directly use the existing debug info instead. 3467 // Throw away any implicit file table for the assembler source. 3468 if (Ctx.getGenDwarfForAssembly()) { 3469 Ctx.getMCDwarfLineTable(0).resetFileTable(); 3470 Ctx.setGenDwarfForAssembly(false); 3471 } 3472 3473 Optional<MD5::MD5Result> CKMem; 3474 if (HasMD5) { 3475 MD5::MD5Result Sum; 3476 for (unsigned i = 0; i != 8; ++i) { 3477 Sum.Bytes[i] = uint8_t(MD5Hi >> ((7 - i) * 8)); 3478 Sum.Bytes[i + 8] = uint8_t(MD5Lo >> ((7 - i) * 8)); 3479 } 3480 CKMem = Sum; 3481 } 3482 if (HasSource) { 3483 char *SourceBuf = static_cast<char *>(Ctx.allocate(SourceString.size())); 3484 memcpy(SourceBuf, SourceString.data(), SourceString.size()); 3485 Source = StringRef(SourceBuf, SourceString.size()); 3486 } 3487 if (FileNumber == 0) { 3488 if (Ctx.getDwarfVersion() < 5) 3489 return Warning(DirectiveLoc, "file 0 not supported prior to DWARF-5"); 3490 getStreamer().emitDwarfFile0Directive(Directory, Filename, CKMem, Source); 3491 } else { 3492 Expected<unsigned> FileNumOrErr = getStreamer().tryEmitDwarfFileDirective( 3493 FileNumber, Directory, Filename, CKMem, Source); 3494 if (!FileNumOrErr) 3495 return Error(DirectiveLoc, toString(FileNumOrErr.takeError())); 3496 } 3497 // Alert the user if there are some .file directives with MD5 and some not. 3498 // But only do that once. 3499 if (!ReportedInconsistentMD5 && !Ctx.isDwarfMD5UsageConsistent(0)) { 3500 ReportedInconsistentMD5 = true; 3501 return Warning(DirectiveLoc, "inconsistent use of MD5 checksums"); 3502 } 3503 } 3504 3505 return false; 3506 } 3507 3508 /// parseDirectiveLine 3509 /// ::= .line [number] 3510 bool AsmParser::parseDirectiveLine() { 3511 int64_t LineNumber; 3512 if (getLexer().is(AsmToken::Integer)) { 3513 if (parseIntToken(LineNumber, "unexpected token in '.line' directive")) 3514 return true; 3515 (void)LineNumber; 3516 // FIXME: Do something with the .line. 3517 } 3518 if (parseToken(AsmToken::EndOfStatement, 3519 "unexpected token in '.line' directive")) 3520 return true; 3521 3522 return false; 3523 } 3524 3525 /// parseDirectiveLoc 3526 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end] 3527 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE] 3528 /// The first number is a file number, must have been previously assigned with 3529 /// a .file directive, the second number is the line number and optionally the 3530 /// third number is a column position (zero if not specified). The remaining 3531 /// optional items are .loc sub-directives. 3532 bool AsmParser::parseDirectiveLoc() { 3533 int64_t FileNumber = 0, LineNumber = 0; 3534 SMLoc Loc = getTok().getLoc(); 3535 if (parseIntToken(FileNumber, "unexpected token in '.loc' directive") || 3536 check(FileNumber < 1 && Ctx.getDwarfVersion() < 5, Loc, 3537 "file number less than one in '.loc' directive") || 3538 check(!getContext().isValidDwarfFileNumber(FileNumber), Loc, 3539 "unassigned file number in '.loc' directive")) 3540 return true; 3541 3542 // optional 3543 if (getLexer().is(AsmToken::Integer)) { 3544 LineNumber = getTok().getIntVal(); 3545 if (LineNumber < 0) 3546 return TokError("line number less than zero in '.loc' directive"); 3547 Lex(); 3548 } 3549 3550 int64_t ColumnPos = 0; 3551 if (getLexer().is(AsmToken::Integer)) { 3552 ColumnPos = getTok().getIntVal(); 3553 if (ColumnPos < 0) 3554 return TokError("column position less than zero in '.loc' directive"); 3555 Lex(); 3556 } 3557 3558 auto PrevFlags = getContext().getCurrentDwarfLoc().getFlags(); 3559 unsigned Flags = PrevFlags & DWARF2_FLAG_IS_STMT; 3560 unsigned Isa = 0; 3561 int64_t Discriminator = 0; 3562 3563 auto parseLocOp = [&]() -> bool { 3564 StringRef Name; 3565 SMLoc Loc = getTok().getLoc(); 3566 if (parseIdentifier(Name)) 3567 return TokError("unexpected token in '.loc' directive"); 3568 3569 if (Name == "basic_block") 3570 Flags |= DWARF2_FLAG_BASIC_BLOCK; 3571 else if (Name == "prologue_end") 3572 Flags |= DWARF2_FLAG_PROLOGUE_END; 3573 else if (Name == "epilogue_begin") 3574 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN; 3575 else if (Name == "is_stmt") { 3576 Loc = getTok().getLoc(); 3577 const MCExpr *Value; 3578 if (parseExpression(Value)) 3579 return true; 3580 // The expression must be the constant 0 or 1. 3581 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3582 int Value = MCE->getValue(); 3583 if (Value == 0) 3584 Flags &= ~DWARF2_FLAG_IS_STMT; 3585 else if (Value == 1) 3586 Flags |= DWARF2_FLAG_IS_STMT; 3587 else 3588 return Error(Loc, "is_stmt value not 0 or 1"); 3589 } else { 3590 return Error(Loc, "is_stmt value not the constant value of 0 or 1"); 3591 } 3592 } else if (Name == "isa") { 3593 Loc = getTok().getLoc(); 3594 const MCExpr *Value; 3595 if (parseExpression(Value)) 3596 return true; 3597 // The expression must be a constant greater or equal to 0. 3598 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3599 int Value = MCE->getValue(); 3600 if (Value < 0) 3601 return Error(Loc, "isa number less than zero"); 3602 Isa = Value; 3603 } else { 3604 return Error(Loc, "isa number not a constant value"); 3605 } 3606 } else if (Name == "discriminator") { 3607 if (parseAbsoluteExpression(Discriminator)) 3608 return true; 3609 } else { 3610 return Error(Loc, "unknown sub-directive in '.loc' directive"); 3611 } 3612 return false; 3613 }; 3614 3615 if (parseMany(parseLocOp, false /*hasComma*/)) 3616 return true; 3617 3618 getStreamer().emitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags, 3619 Isa, Discriminator, StringRef()); 3620 3621 return false; 3622 } 3623 3624 /// parseDirectiveStabs 3625 /// ::= .stabs string, number, number, number 3626 bool AsmParser::parseDirectiveStabs() { 3627 return TokError("unsupported directive '.stabs'"); 3628 } 3629 3630 /// parseDirectiveCVFile 3631 /// ::= .cv_file number filename [checksum] [checksumkind] 3632 bool AsmParser::parseDirectiveCVFile() { 3633 SMLoc FileNumberLoc = getTok().getLoc(); 3634 int64_t FileNumber; 3635 std::string Filename; 3636 std::string Checksum; 3637 int64_t ChecksumKind = 0; 3638 3639 if (parseIntToken(FileNumber, 3640 "expected file number in '.cv_file' directive") || 3641 check(FileNumber < 1, FileNumberLoc, "file number less than one") || 3642 check(getTok().isNot(AsmToken::String), 3643 "unexpected token in '.cv_file' directive") || 3644 parseEscapedString(Filename)) 3645 return true; 3646 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 3647 if (check(getTok().isNot(AsmToken::String), 3648 "unexpected token in '.cv_file' directive") || 3649 parseEscapedString(Checksum) || 3650 parseIntToken(ChecksumKind, 3651 "expected checksum kind in '.cv_file' directive") || 3652 parseToken(AsmToken::EndOfStatement, 3653 "unexpected token in '.cv_file' directive")) 3654 return true; 3655 } 3656 3657 Checksum = fromHex(Checksum); 3658 void *CKMem = Ctx.allocate(Checksum.size(), 1); 3659 memcpy(CKMem, Checksum.data(), Checksum.size()); 3660 ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem), 3661 Checksum.size()); 3662 3663 if (!getStreamer().EmitCVFileDirective(FileNumber, Filename, ChecksumAsBytes, 3664 static_cast<uint8_t>(ChecksumKind))) 3665 return Error(FileNumberLoc, "file number already allocated"); 3666 3667 return false; 3668 } 3669 3670 bool AsmParser::parseCVFunctionId(int64_t &FunctionId, 3671 StringRef DirectiveName) { 3672 SMLoc Loc; 3673 return parseTokenLoc(Loc) || 3674 parseIntToken(FunctionId, "expected function id in '" + DirectiveName + 3675 "' directive") || 3676 check(FunctionId < 0 || FunctionId >= UINT_MAX, Loc, 3677 "expected function id within range [0, UINT_MAX)"); 3678 } 3679 3680 bool AsmParser::parseCVFileId(int64_t &FileNumber, StringRef DirectiveName) { 3681 SMLoc Loc; 3682 return parseTokenLoc(Loc) || 3683 parseIntToken(FileNumber, "expected integer in '" + DirectiveName + 3684 "' directive") || 3685 check(FileNumber < 1, Loc, "file number less than one in '" + 3686 DirectiveName + "' directive") || 3687 check(!getCVContext().isValidFileNumber(FileNumber), Loc, 3688 "unassigned file number in '" + DirectiveName + "' directive"); 3689 } 3690 3691 /// parseDirectiveCVFuncId 3692 /// ::= .cv_func_id FunctionId 3693 /// 3694 /// Introduces a function ID that can be used with .cv_loc. 3695 bool AsmParser::parseDirectiveCVFuncId() { 3696 SMLoc FunctionIdLoc = getTok().getLoc(); 3697 int64_t FunctionId; 3698 3699 if (parseCVFunctionId(FunctionId, ".cv_func_id") || 3700 parseToken(AsmToken::EndOfStatement, 3701 "unexpected token in '.cv_func_id' directive")) 3702 return true; 3703 3704 if (!getStreamer().EmitCVFuncIdDirective(FunctionId)) 3705 return Error(FunctionIdLoc, "function id already allocated"); 3706 3707 return false; 3708 } 3709 3710 /// parseDirectiveCVInlineSiteId 3711 /// ::= .cv_inline_site_id FunctionId 3712 /// "within" IAFunc 3713 /// "inlined_at" IAFile IALine [IACol] 3714 /// 3715 /// Introduces a function ID that can be used with .cv_loc. Includes "inlined 3716 /// at" source location information for use in the line table of the caller, 3717 /// whether the caller is a real function or another inlined call site. 3718 bool AsmParser::parseDirectiveCVInlineSiteId() { 3719 SMLoc FunctionIdLoc = getTok().getLoc(); 3720 int64_t FunctionId; 3721 int64_t IAFunc; 3722 int64_t IAFile; 3723 int64_t IALine; 3724 int64_t IACol = 0; 3725 3726 // FunctionId 3727 if (parseCVFunctionId(FunctionId, ".cv_inline_site_id")) 3728 return true; 3729 3730 // "within" 3731 if (check((getLexer().isNot(AsmToken::Identifier) || 3732 getTok().getIdentifier() != "within"), 3733 "expected 'within' identifier in '.cv_inline_site_id' directive")) 3734 return true; 3735 Lex(); 3736 3737 // IAFunc 3738 if (parseCVFunctionId(IAFunc, ".cv_inline_site_id")) 3739 return true; 3740 3741 // "inlined_at" 3742 if (check((getLexer().isNot(AsmToken::Identifier) || 3743 getTok().getIdentifier() != "inlined_at"), 3744 "expected 'inlined_at' identifier in '.cv_inline_site_id' " 3745 "directive") ) 3746 return true; 3747 Lex(); 3748 3749 // IAFile IALine 3750 if (parseCVFileId(IAFile, ".cv_inline_site_id") || 3751 parseIntToken(IALine, "expected line number after 'inlined_at'")) 3752 return true; 3753 3754 // [IACol] 3755 if (getLexer().is(AsmToken::Integer)) { 3756 IACol = getTok().getIntVal(); 3757 Lex(); 3758 } 3759 3760 if (parseToken(AsmToken::EndOfStatement, 3761 "unexpected token in '.cv_inline_site_id' directive")) 3762 return true; 3763 3764 if (!getStreamer().EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile, 3765 IALine, IACol, FunctionIdLoc)) 3766 return Error(FunctionIdLoc, "function id already allocated"); 3767 3768 return false; 3769 } 3770 3771 /// parseDirectiveCVLoc 3772 /// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end] 3773 /// [is_stmt VALUE] 3774 /// The first number is a file number, must have been previously assigned with 3775 /// a .file directive, the second number is the line number and optionally the 3776 /// third number is a column position (zero if not specified). The remaining 3777 /// optional items are .loc sub-directives. 3778 bool AsmParser::parseDirectiveCVLoc() { 3779 SMLoc DirectiveLoc = getTok().getLoc(); 3780 int64_t FunctionId, FileNumber; 3781 if (parseCVFunctionId(FunctionId, ".cv_loc") || 3782 parseCVFileId(FileNumber, ".cv_loc")) 3783 return true; 3784 3785 int64_t LineNumber = 0; 3786 if (getLexer().is(AsmToken::Integer)) { 3787 LineNumber = getTok().getIntVal(); 3788 if (LineNumber < 0) 3789 return TokError("line number less than zero in '.cv_loc' directive"); 3790 Lex(); 3791 } 3792 3793 int64_t ColumnPos = 0; 3794 if (getLexer().is(AsmToken::Integer)) { 3795 ColumnPos = getTok().getIntVal(); 3796 if (ColumnPos < 0) 3797 return TokError("column position less than zero in '.cv_loc' directive"); 3798 Lex(); 3799 } 3800 3801 bool PrologueEnd = false; 3802 uint64_t IsStmt = 0; 3803 3804 auto parseOp = [&]() -> bool { 3805 StringRef Name; 3806 SMLoc Loc = getTok().getLoc(); 3807 if (parseIdentifier(Name)) 3808 return TokError("unexpected token in '.cv_loc' directive"); 3809 if (Name == "prologue_end") 3810 PrologueEnd = true; 3811 else if (Name == "is_stmt") { 3812 Loc = getTok().getLoc(); 3813 const MCExpr *Value; 3814 if (parseExpression(Value)) 3815 return true; 3816 // The expression must be the constant 0 or 1. 3817 IsStmt = ~0ULL; 3818 if (const auto *MCE = dyn_cast<MCConstantExpr>(Value)) 3819 IsStmt = MCE->getValue(); 3820 3821 if (IsStmt > 1) 3822 return Error(Loc, "is_stmt value not 0 or 1"); 3823 } else { 3824 return Error(Loc, "unknown sub-directive in '.cv_loc' directive"); 3825 } 3826 return false; 3827 }; 3828 3829 if (parseMany(parseOp, false /*hasComma*/)) 3830 return true; 3831 3832 getStreamer().emitCVLocDirective(FunctionId, FileNumber, LineNumber, 3833 ColumnPos, PrologueEnd, IsStmt, StringRef(), 3834 DirectiveLoc); 3835 return false; 3836 } 3837 3838 /// parseDirectiveCVLinetable 3839 /// ::= .cv_linetable FunctionId, FnStart, FnEnd 3840 bool AsmParser::parseDirectiveCVLinetable() { 3841 int64_t FunctionId; 3842 StringRef FnStartName, FnEndName; 3843 SMLoc Loc = getTok().getLoc(); 3844 if (parseCVFunctionId(FunctionId, ".cv_linetable") || 3845 parseToken(AsmToken::Comma, 3846 "unexpected token in '.cv_linetable' directive") || 3847 parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc, 3848 "expected identifier in directive") || 3849 parseToken(AsmToken::Comma, 3850 "unexpected token in '.cv_linetable' directive") || 3851 parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc, 3852 "expected identifier in directive")) 3853 return true; 3854 3855 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 3856 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 3857 3858 getStreamer().emitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym); 3859 return false; 3860 } 3861 3862 /// parseDirectiveCVInlineLinetable 3863 /// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd 3864 bool AsmParser::parseDirectiveCVInlineLinetable() { 3865 int64_t PrimaryFunctionId, SourceFileId, SourceLineNum; 3866 StringRef FnStartName, FnEndName; 3867 SMLoc Loc = getTok().getLoc(); 3868 if (parseCVFunctionId(PrimaryFunctionId, ".cv_inline_linetable") || 3869 parseTokenLoc(Loc) || 3870 parseIntToken( 3871 SourceFileId, 3872 "expected SourceField in '.cv_inline_linetable' directive") || 3873 check(SourceFileId <= 0, Loc, 3874 "File id less than zero in '.cv_inline_linetable' directive") || 3875 parseTokenLoc(Loc) || 3876 parseIntToken( 3877 SourceLineNum, 3878 "expected SourceLineNum in '.cv_inline_linetable' directive") || 3879 check(SourceLineNum < 0, Loc, 3880 "Line number less than zero in '.cv_inline_linetable' directive") || 3881 parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc, 3882 "expected identifier in directive") || 3883 parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc, 3884 "expected identifier in directive")) 3885 return true; 3886 3887 if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement")) 3888 return true; 3889 3890 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 3891 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 3892 getStreamer().emitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId, 3893 SourceLineNum, FnStartSym, 3894 FnEndSym); 3895 return false; 3896 } 3897 3898 void AsmParser::initializeCVDefRangeTypeMap() { 3899 CVDefRangeTypeMap["reg"] = CVDR_DEFRANGE_REGISTER; 3900 CVDefRangeTypeMap["frame_ptr_rel"] = CVDR_DEFRANGE_FRAMEPOINTER_REL; 3901 CVDefRangeTypeMap["subfield_reg"] = CVDR_DEFRANGE_SUBFIELD_REGISTER; 3902 CVDefRangeTypeMap["reg_rel"] = CVDR_DEFRANGE_REGISTER_REL; 3903 } 3904 3905 /// parseDirectiveCVDefRange 3906 /// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes* 3907 bool AsmParser::parseDirectiveCVDefRange() { 3908 SMLoc Loc; 3909 std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges; 3910 while (getLexer().is(AsmToken::Identifier)) { 3911 Loc = getLexer().getLoc(); 3912 StringRef GapStartName; 3913 if (parseIdentifier(GapStartName)) 3914 return Error(Loc, "expected identifier in directive"); 3915 MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName); 3916 3917 Loc = getLexer().getLoc(); 3918 StringRef GapEndName; 3919 if (parseIdentifier(GapEndName)) 3920 return Error(Loc, "expected identifier in directive"); 3921 MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName); 3922 3923 Ranges.push_back({GapStartSym, GapEndSym}); 3924 } 3925 3926 StringRef CVDefRangeTypeStr; 3927 if (parseToken( 3928 AsmToken::Comma, 3929 "expected comma before def_range type in .cv_def_range directive") || 3930 parseIdentifier(CVDefRangeTypeStr)) 3931 return Error(Loc, "expected def_range type in directive"); 3932 3933 StringMap<CVDefRangeType>::const_iterator CVTypeIt = 3934 CVDefRangeTypeMap.find(CVDefRangeTypeStr); 3935 CVDefRangeType CVDRType = (CVTypeIt == CVDefRangeTypeMap.end()) 3936 ? CVDR_DEFRANGE 3937 : CVTypeIt->getValue(); 3938 switch (CVDRType) { 3939 case CVDR_DEFRANGE_REGISTER: { 3940 int64_t DRRegister; 3941 if (parseToken(AsmToken::Comma, "expected comma before register number in " 3942 ".cv_def_range directive") || 3943 parseAbsoluteExpression(DRRegister)) 3944 return Error(Loc, "expected register number"); 3945 3946 codeview::DefRangeRegisterHeader DRHdr; 3947 DRHdr.Register = DRRegister; 3948 DRHdr.MayHaveNoName = 0; 3949 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 3950 break; 3951 } 3952 case CVDR_DEFRANGE_FRAMEPOINTER_REL: { 3953 int64_t DROffset; 3954 if (parseToken(AsmToken::Comma, 3955 "expected comma before offset in .cv_def_range directive") || 3956 parseAbsoluteExpression(DROffset)) 3957 return Error(Loc, "expected offset value"); 3958 3959 codeview::DefRangeFramePointerRelHeader DRHdr; 3960 DRHdr.Offset = DROffset; 3961 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 3962 break; 3963 } 3964 case CVDR_DEFRANGE_SUBFIELD_REGISTER: { 3965 int64_t DRRegister; 3966 int64_t DROffsetInParent; 3967 if (parseToken(AsmToken::Comma, "expected comma before register number in " 3968 ".cv_def_range directive") || 3969 parseAbsoluteExpression(DRRegister)) 3970 return Error(Loc, "expected register number"); 3971 if (parseToken(AsmToken::Comma, 3972 "expected comma before offset in .cv_def_range directive") || 3973 parseAbsoluteExpression(DROffsetInParent)) 3974 return Error(Loc, "expected offset value"); 3975 3976 codeview::DefRangeSubfieldRegisterHeader DRHdr; 3977 DRHdr.Register = DRRegister; 3978 DRHdr.MayHaveNoName = 0; 3979 DRHdr.OffsetInParent = DROffsetInParent; 3980 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 3981 break; 3982 } 3983 case CVDR_DEFRANGE_REGISTER_REL: { 3984 int64_t DRRegister; 3985 int64_t DRFlags; 3986 int64_t DRBasePointerOffset; 3987 if (parseToken(AsmToken::Comma, "expected comma before register number in " 3988 ".cv_def_range directive") || 3989 parseAbsoluteExpression(DRRegister)) 3990 return Error(Loc, "expected register value"); 3991 if (parseToken( 3992 AsmToken::Comma, 3993 "expected comma before flag value in .cv_def_range directive") || 3994 parseAbsoluteExpression(DRFlags)) 3995 return Error(Loc, "expected flag value"); 3996 if (parseToken(AsmToken::Comma, "expected comma before base pointer offset " 3997 "in .cv_def_range directive") || 3998 parseAbsoluteExpression(DRBasePointerOffset)) 3999 return Error(Loc, "expected base pointer offset value"); 4000 4001 codeview::DefRangeRegisterRelHeader DRHdr; 4002 DRHdr.Register = DRRegister; 4003 DRHdr.Flags = DRFlags; 4004 DRHdr.BasePointerOffset = DRBasePointerOffset; 4005 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4006 break; 4007 } 4008 default: 4009 return Error(Loc, "unexpected def_range type in .cv_def_range directive"); 4010 } 4011 return true; 4012 } 4013 4014 /// parseDirectiveCVString 4015 /// ::= .cv_stringtable "string" 4016 bool AsmParser::parseDirectiveCVString() { 4017 std::string Data; 4018 if (checkForValidSection() || parseEscapedString(Data)) 4019 return addErrorSuffix(" in '.cv_string' directive"); 4020 4021 // Put the string in the table and emit the offset. 4022 std::pair<StringRef, unsigned> Insertion = 4023 getCVContext().addToStringTable(Data); 4024 getStreamer().emitInt32(Insertion.second); 4025 return false; 4026 } 4027 4028 /// parseDirectiveCVStringTable 4029 /// ::= .cv_stringtable 4030 bool AsmParser::parseDirectiveCVStringTable() { 4031 getStreamer().emitCVStringTableDirective(); 4032 return false; 4033 } 4034 4035 /// parseDirectiveCVFileChecksums 4036 /// ::= .cv_filechecksums 4037 bool AsmParser::parseDirectiveCVFileChecksums() { 4038 getStreamer().emitCVFileChecksumsDirective(); 4039 return false; 4040 } 4041 4042 /// parseDirectiveCVFileChecksumOffset 4043 /// ::= .cv_filechecksumoffset fileno 4044 bool AsmParser::parseDirectiveCVFileChecksumOffset() { 4045 int64_t FileNo; 4046 if (parseIntToken(FileNo, "expected identifier in directive")) 4047 return true; 4048 if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement")) 4049 return true; 4050 getStreamer().emitCVFileChecksumOffsetDirective(FileNo); 4051 return false; 4052 } 4053 4054 /// parseDirectiveCVFPOData 4055 /// ::= .cv_fpo_data procsym 4056 bool AsmParser::parseDirectiveCVFPOData() { 4057 SMLoc DirLoc = getLexer().getLoc(); 4058 StringRef ProcName; 4059 if (parseIdentifier(ProcName)) 4060 return TokError("expected symbol name"); 4061 if (parseEOL("unexpected tokens")) 4062 return addErrorSuffix(" in '.cv_fpo_data' directive"); 4063 MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName); 4064 getStreamer().EmitCVFPOData(ProcSym, DirLoc); 4065 return false; 4066 } 4067 4068 /// parseDirectiveCFISections 4069 /// ::= .cfi_sections section [, section] 4070 bool AsmParser::parseDirectiveCFISections() { 4071 StringRef Name; 4072 bool EH = false; 4073 bool Debug = false; 4074 4075 if (parseIdentifier(Name)) 4076 return TokError("Expected an identifier"); 4077 4078 if (Name == ".eh_frame") 4079 EH = true; 4080 else if (Name == ".debug_frame") 4081 Debug = true; 4082 4083 if (getLexer().is(AsmToken::Comma)) { 4084 Lex(); 4085 4086 if (parseIdentifier(Name)) 4087 return TokError("Expected an identifier"); 4088 4089 if (Name == ".eh_frame") 4090 EH = true; 4091 else if (Name == ".debug_frame") 4092 Debug = true; 4093 } 4094 4095 if (parseToken(AsmToken::EndOfStatement)) 4096 return addErrorSuffix(" in '.cfi_sections' directive"); 4097 4098 getStreamer().emitCFISections(EH, Debug); 4099 return false; 4100 } 4101 4102 /// parseDirectiveCFIStartProc 4103 /// ::= .cfi_startproc [simple] 4104 bool AsmParser::parseDirectiveCFIStartProc() { 4105 StringRef Simple; 4106 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4107 if (check(parseIdentifier(Simple) || Simple != "simple", 4108 "unexpected token") || 4109 parseToken(AsmToken::EndOfStatement)) 4110 return addErrorSuffix(" in '.cfi_startproc' directive"); 4111 } 4112 4113 // TODO(kristina): Deal with a corner case of incorrect diagnostic context 4114 // being produced if this directive is emitted as part of preprocessor macro 4115 // expansion which can *ONLY* happen if Clang's cc1as is the API consumer. 4116 // Tools like llvm-mc on the other hand are not affected by it, and report 4117 // correct context information. 4118 getStreamer().emitCFIStartProc(!Simple.empty(), Lexer.getLoc()); 4119 return false; 4120 } 4121 4122 /// parseDirectiveCFIEndProc 4123 /// ::= .cfi_endproc 4124 bool AsmParser::parseDirectiveCFIEndProc() { 4125 if (parseToken(AsmToken::EndOfStatement)) 4126 return addErrorSuffix(" in '.cfi_endproc' directive"); 4127 getStreamer().emitCFIEndProc(); 4128 return false; 4129 } 4130 4131 /// parse register name or number. 4132 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register, 4133 SMLoc DirectiveLoc) { 4134 unsigned RegNo; 4135 4136 if (getLexer().isNot(AsmToken::Integer)) { 4137 if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc)) 4138 return true; 4139 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true); 4140 } else 4141 return parseAbsoluteExpression(Register); 4142 4143 return false; 4144 } 4145 4146 /// parseDirectiveCFIDefCfa 4147 /// ::= .cfi_def_cfa register, offset 4148 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) { 4149 int64_t Register = 0, Offset = 0; 4150 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || 4151 parseToken(AsmToken::Comma, "unexpected token in directive") || 4152 parseAbsoluteExpression(Offset)) 4153 return true; 4154 4155 getStreamer().emitCFIDefCfa(Register, Offset); 4156 return false; 4157 } 4158 4159 /// parseDirectiveCFIDefCfaOffset 4160 /// ::= .cfi_def_cfa_offset offset 4161 bool AsmParser::parseDirectiveCFIDefCfaOffset() { 4162 int64_t Offset = 0; 4163 if (parseAbsoluteExpression(Offset)) 4164 return true; 4165 4166 getStreamer().emitCFIDefCfaOffset(Offset); 4167 return false; 4168 } 4169 4170 /// parseDirectiveCFIRegister 4171 /// ::= .cfi_register register, register 4172 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) { 4173 int64_t Register1 = 0, Register2 = 0; 4174 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc) || 4175 parseToken(AsmToken::Comma, "unexpected token in directive") || 4176 parseRegisterOrRegisterNumber(Register2, DirectiveLoc)) 4177 return true; 4178 4179 getStreamer().emitCFIRegister(Register1, Register2); 4180 return false; 4181 } 4182 4183 /// parseDirectiveCFIWindowSave 4184 /// ::= .cfi_window_save 4185 bool AsmParser::parseDirectiveCFIWindowSave() { 4186 getStreamer().emitCFIWindowSave(); 4187 return false; 4188 } 4189 4190 /// parseDirectiveCFIAdjustCfaOffset 4191 /// ::= .cfi_adjust_cfa_offset adjustment 4192 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() { 4193 int64_t Adjustment = 0; 4194 if (parseAbsoluteExpression(Adjustment)) 4195 return true; 4196 4197 getStreamer().emitCFIAdjustCfaOffset(Adjustment); 4198 return false; 4199 } 4200 4201 /// parseDirectiveCFIDefCfaRegister 4202 /// ::= .cfi_def_cfa_register register 4203 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) { 4204 int64_t Register = 0; 4205 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 4206 return true; 4207 4208 getStreamer().emitCFIDefCfaRegister(Register); 4209 return false; 4210 } 4211 4212 /// parseDirectiveCFIOffset 4213 /// ::= .cfi_offset register, offset 4214 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) { 4215 int64_t Register = 0; 4216 int64_t Offset = 0; 4217 4218 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || 4219 parseToken(AsmToken::Comma, "unexpected token in directive") || 4220 parseAbsoluteExpression(Offset)) 4221 return true; 4222 4223 getStreamer().emitCFIOffset(Register, Offset); 4224 return false; 4225 } 4226 4227 /// parseDirectiveCFIRelOffset 4228 /// ::= .cfi_rel_offset register, offset 4229 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) { 4230 int64_t Register = 0, Offset = 0; 4231 4232 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || 4233 parseToken(AsmToken::Comma, "unexpected token in directive") || 4234 parseAbsoluteExpression(Offset)) 4235 return true; 4236 4237 getStreamer().emitCFIRelOffset(Register, Offset); 4238 return false; 4239 } 4240 4241 static bool isValidEncoding(int64_t Encoding) { 4242 if (Encoding & ~0xff) 4243 return false; 4244 4245 if (Encoding == dwarf::DW_EH_PE_omit) 4246 return true; 4247 4248 const unsigned Format = Encoding & 0xf; 4249 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && 4250 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && 4251 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && 4252 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) 4253 return false; 4254 4255 const unsigned Application = Encoding & 0x70; 4256 if (Application != dwarf::DW_EH_PE_absptr && 4257 Application != dwarf::DW_EH_PE_pcrel) 4258 return false; 4259 4260 return true; 4261 } 4262 4263 /// parseDirectiveCFIPersonalityOrLsda 4264 /// IsPersonality true for cfi_personality, false for cfi_lsda 4265 /// ::= .cfi_personality encoding, [symbol_name] 4266 /// ::= .cfi_lsda encoding, [symbol_name] 4267 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) { 4268 int64_t Encoding = 0; 4269 if (parseAbsoluteExpression(Encoding)) 4270 return true; 4271 if (Encoding == dwarf::DW_EH_PE_omit) 4272 return false; 4273 4274 StringRef Name; 4275 if (check(!isValidEncoding(Encoding), "unsupported encoding.") || 4276 parseToken(AsmToken::Comma, "unexpected token in directive") || 4277 check(parseIdentifier(Name), "expected identifier in directive")) 4278 return true; 4279 4280 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4281 4282 if (IsPersonality) 4283 getStreamer().emitCFIPersonality(Sym, Encoding); 4284 else 4285 getStreamer().emitCFILsda(Sym, Encoding); 4286 return false; 4287 } 4288 4289 /// parseDirectiveCFIRememberState 4290 /// ::= .cfi_remember_state 4291 bool AsmParser::parseDirectiveCFIRememberState() { 4292 getStreamer().emitCFIRememberState(); 4293 return false; 4294 } 4295 4296 /// parseDirectiveCFIRestoreState 4297 /// ::= .cfi_remember_state 4298 bool AsmParser::parseDirectiveCFIRestoreState() { 4299 getStreamer().emitCFIRestoreState(); 4300 return false; 4301 } 4302 4303 /// parseDirectiveCFISameValue 4304 /// ::= .cfi_same_value register 4305 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) { 4306 int64_t Register = 0; 4307 4308 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 4309 return true; 4310 4311 getStreamer().emitCFISameValue(Register); 4312 return false; 4313 } 4314 4315 /// parseDirectiveCFIRestore 4316 /// ::= .cfi_restore register 4317 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) { 4318 int64_t Register = 0; 4319 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 4320 return true; 4321 4322 getStreamer().emitCFIRestore(Register); 4323 return false; 4324 } 4325 4326 /// parseDirectiveCFIEscape 4327 /// ::= .cfi_escape expression[,...] 4328 bool AsmParser::parseDirectiveCFIEscape() { 4329 std::string Values; 4330 int64_t CurrValue; 4331 if (parseAbsoluteExpression(CurrValue)) 4332 return true; 4333 4334 Values.push_back((uint8_t)CurrValue); 4335 4336 while (getLexer().is(AsmToken::Comma)) { 4337 Lex(); 4338 4339 if (parseAbsoluteExpression(CurrValue)) 4340 return true; 4341 4342 Values.push_back((uint8_t)CurrValue); 4343 } 4344 4345 getStreamer().emitCFIEscape(Values); 4346 return false; 4347 } 4348 4349 /// parseDirectiveCFIReturnColumn 4350 /// ::= .cfi_return_column register 4351 bool AsmParser::parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc) { 4352 int64_t Register = 0; 4353 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 4354 return true; 4355 getStreamer().emitCFIReturnColumn(Register); 4356 return false; 4357 } 4358 4359 /// parseDirectiveCFISignalFrame 4360 /// ::= .cfi_signal_frame 4361 bool AsmParser::parseDirectiveCFISignalFrame() { 4362 if (parseToken(AsmToken::EndOfStatement, 4363 "unexpected token in '.cfi_signal_frame'")) 4364 return true; 4365 4366 getStreamer().emitCFISignalFrame(); 4367 return false; 4368 } 4369 4370 /// parseDirectiveCFIUndefined 4371 /// ::= .cfi_undefined register 4372 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) { 4373 int64_t Register = 0; 4374 4375 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc)) 4376 return true; 4377 4378 getStreamer().emitCFIUndefined(Register); 4379 return false; 4380 } 4381 4382 /// parseDirectiveAltmacro 4383 /// ::= .altmacro 4384 /// ::= .noaltmacro 4385 bool AsmParser::parseDirectiveAltmacro(StringRef Directive) { 4386 if (getLexer().isNot(AsmToken::EndOfStatement)) 4387 return TokError("unexpected token in '" + Directive + "' directive"); 4388 AltMacroMode = (Directive == ".altmacro"); 4389 return false; 4390 } 4391 4392 /// parseDirectiveMacrosOnOff 4393 /// ::= .macros_on 4394 /// ::= .macros_off 4395 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) { 4396 if (parseToken(AsmToken::EndOfStatement, 4397 "unexpected token in '" + Directive + "' directive")) 4398 return true; 4399 4400 setMacrosEnabled(Directive == ".macros_on"); 4401 return false; 4402 } 4403 4404 /// parseDirectiveMacro 4405 /// ::= .macro name[,] [parameters] 4406 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) { 4407 StringRef Name; 4408 if (parseIdentifier(Name)) 4409 return TokError("expected identifier in '.macro' directive"); 4410 4411 if (getLexer().is(AsmToken::Comma)) 4412 Lex(); 4413 4414 MCAsmMacroParameters Parameters; 4415 while (getLexer().isNot(AsmToken::EndOfStatement)) { 4416 4417 if (!Parameters.empty() && Parameters.back().Vararg) 4418 return Error(Lexer.getLoc(), "vararg parameter '" + 4419 Parameters.back().Name + 4420 "' should be the last parameter"); 4421 4422 MCAsmMacroParameter Parameter; 4423 if (parseIdentifier(Parameter.Name)) 4424 return TokError("expected identifier in '.macro' directive"); 4425 4426 // Emit an error if two (or more) named parameters share the same name 4427 for (const MCAsmMacroParameter& CurrParam : Parameters) 4428 if (CurrParam.Name.equals(Parameter.Name)) 4429 return TokError("macro '" + Name + "' has multiple parameters" 4430 " named '" + Parameter.Name + "'"); 4431 4432 if (Lexer.is(AsmToken::Colon)) { 4433 Lex(); // consume ':' 4434 4435 SMLoc QualLoc; 4436 StringRef Qualifier; 4437 4438 QualLoc = Lexer.getLoc(); 4439 if (parseIdentifier(Qualifier)) 4440 return Error(QualLoc, "missing parameter qualifier for " 4441 "'" + Parameter.Name + "' in macro '" + Name + "'"); 4442 4443 if (Qualifier == "req") 4444 Parameter.Required = true; 4445 else if (Qualifier == "vararg") 4446 Parameter.Vararg = true; 4447 else 4448 return Error(QualLoc, Qualifier + " is not a valid parameter qualifier " 4449 "for '" + Parameter.Name + "' in macro '" + Name + "'"); 4450 } 4451 4452 if (getLexer().is(AsmToken::Equal)) { 4453 Lex(); 4454 4455 SMLoc ParamLoc; 4456 4457 ParamLoc = Lexer.getLoc(); 4458 if (parseMacroArgument(Parameter.Value, /*Vararg=*/false )) 4459 return true; 4460 4461 if (Parameter.Required) 4462 Warning(ParamLoc, "pointless default value for required parameter " 4463 "'" + Parameter.Name + "' in macro '" + Name + "'"); 4464 } 4465 4466 Parameters.push_back(std::move(Parameter)); 4467 4468 if (getLexer().is(AsmToken::Comma)) 4469 Lex(); 4470 } 4471 4472 // Eat just the end of statement. 4473 Lexer.Lex(); 4474 4475 // Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors 4476 AsmToken EndToken, StartToken = getTok(); 4477 unsigned MacroDepth = 0; 4478 // Lex the macro definition. 4479 while (true) { 4480 // Ignore Lexing errors in macros. 4481 while (Lexer.is(AsmToken::Error)) { 4482 Lexer.Lex(); 4483 } 4484 4485 // Check whether we have reached the end of the file. 4486 if (getLexer().is(AsmToken::Eof)) 4487 return Error(DirectiveLoc, "no matching '.endmacro' in definition"); 4488 4489 // Otherwise, check whether we have reach the .endmacro or the start of a 4490 // preprocessor line marker. 4491 if (getLexer().is(AsmToken::Identifier)) { 4492 if (getTok().getIdentifier() == ".endm" || 4493 getTok().getIdentifier() == ".endmacro") { 4494 if (MacroDepth == 0) { // Outermost macro. 4495 EndToken = getTok(); 4496 Lexer.Lex(); 4497 if (getLexer().isNot(AsmToken::EndOfStatement)) 4498 return TokError("unexpected token in '" + EndToken.getIdentifier() + 4499 "' directive"); 4500 break; 4501 } else { 4502 // Otherwise we just found the end of an inner macro. 4503 --MacroDepth; 4504 } 4505 } else if (getTok().getIdentifier() == ".macro") { 4506 // We allow nested macros. Those aren't instantiated until the outermost 4507 // macro is expanded so just ignore them for now. 4508 ++MacroDepth; 4509 } 4510 } else if (Lexer.is(AsmToken::HashDirective)) { 4511 (void)parseCppHashLineFilenameComment(getLexer().getLoc()); 4512 } 4513 4514 // Otherwise, scan til the end of the statement. 4515 eatToEndOfStatement(); 4516 } 4517 4518 if (getContext().lookupMacro(Name)) { 4519 return Error(DirectiveLoc, "macro '" + Name + "' is already defined"); 4520 } 4521 4522 const char *BodyStart = StartToken.getLoc().getPointer(); 4523 const char *BodyEnd = EndToken.getLoc().getPointer(); 4524 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 4525 checkForBadMacro(DirectiveLoc, Name, Body, Parameters); 4526 MCAsmMacro Macro(Name, Body, std::move(Parameters)); 4527 DEBUG_WITH_TYPE("asm-macros", dbgs() << "Defining new macro:\n"; 4528 Macro.dump()); 4529 getContext().defineMacro(Name, std::move(Macro)); 4530 return false; 4531 } 4532 4533 /// checkForBadMacro 4534 /// 4535 /// With the support added for named parameters there may be code out there that 4536 /// is transitioning from positional parameters. In versions of gas that did 4537 /// not support named parameters they would be ignored on the macro definition. 4538 /// But to support both styles of parameters this is not possible so if a macro 4539 /// definition has named parameters but does not use them and has what appears 4540 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a 4541 /// warning that the positional parameter found in body which have no effect. 4542 /// Hoping the developer will either remove the named parameters from the macro 4543 /// definition so the positional parameters get used if that was what was 4544 /// intended or change the macro to use the named parameters. It is possible 4545 /// this warning will trigger when the none of the named parameters are used 4546 /// and the strings like $1 are infact to simply to be passed trough unchanged. 4547 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, 4548 StringRef Body, 4549 ArrayRef<MCAsmMacroParameter> Parameters) { 4550 // If this macro is not defined with named parameters the warning we are 4551 // checking for here doesn't apply. 4552 unsigned NParameters = Parameters.size(); 4553 if (NParameters == 0) 4554 return; 4555 4556 bool NamedParametersFound = false; 4557 bool PositionalParametersFound = false; 4558 4559 // Look at the body of the macro for use of both the named parameters and what 4560 // are likely to be positional parameters. This is what expandMacro() is 4561 // doing when it finds the parameters in the body. 4562 while (!Body.empty()) { 4563 // Scan for the next possible parameter. 4564 std::size_t End = Body.size(), Pos = 0; 4565 for (; Pos != End; ++Pos) { 4566 // Check for a substitution or escape. 4567 // This macro is defined with parameters, look for \foo, \bar, etc. 4568 if (Body[Pos] == '\\' && Pos + 1 != End) 4569 break; 4570 4571 // This macro should have parameters, but look for $0, $1, ..., $n too. 4572 if (Body[Pos] != '$' || Pos + 1 == End) 4573 continue; 4574 char Next = Body[Pos + 1]; 4575 if (Next == '$' || Next == 'n' || 4576 isdigit(static_cast<unsigned char>(Next))) 4577 break; 4578 } 4579 4580 // Check if we reached the end. 4581 if (Pos == End) 4582 break; 4583 4584 if (Body[Pos] == '$') { 4585 switch (Body[Pos + 1]) { 4586 // $$ => $ 4587 case '$': 4588 break; 4589 4590 // $n => number of arguments 4591 case 'n': 4592 PositionalParametersFound = true; 4593 break; 4594 4595 // $[0-9] => argument 4596 default: { 4597 PositionalParametersFound = true; 4598 break; 4599 } 4600 } 4601 Pos += 2; 4602 } else { 4603 unsigned I = Pos + 1; 4604 while (isIdentifierChar(Body[I]) && I + 1 != End) 4605 ++I; 4606 4607 const char *Begin = Body.data() + Pos + 1; 4608 StringRef Argument(Begin, I - (Pos + 1)); 4609 unsigned Index = 0; 4610 for (; Index < NParameters; ++Index) 4611 if (Parameters[Index].Name == Argument) 4612 break; 4613 4614 if (Index == NParameters) { 4615 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 4616 Pos += 3; 4617 else { 4618 Pos = I; 4619 } 4620 } else { 4621 NamedParametersFound = true; 4622 Pos += 1 + Argument.size(); 4623 } 4624 } 4625 // Update the scan point. 4626 Body = Body.substr(Pos); 4627 } 4628 4629 if (!NamedParametersFound && PositionalParametersFound) 4630 Warning(DirectiveLoc, "macro defined with named parameters which are not " 4631 "used in macro body, possible positional parameter " 4632 "found in body which will have no effect"); 4633 } 4634 4635 /// parseDirectiveExitMacro 4636 /// ::= .exitm 4637 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) { 4638 if (parseToken(AsmToken::EndOfStatement, 4639 "unexpected token in '" + Directive + "' directive")) 4640 return true; 4641 4642 if (!isInsideMacroInstantiation()) 4643 return TokError("unexpected '" + Directive + "' in file, " 4644 "no current macro definition"); 4645 4646 // Exit all conditionals that are active in the current macro. 4647 while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) { 4648 TheCondState = TheCondStack.back(); 4649 TheCondStack.pop_back(); 4650 } 4651 4652 handleMacroExit(); 4653 return false; 4654 } 4655 4656 /// parseDirectiveEndMacro 4657 /// ::= .endm 4658 /// ::= .endmacro 4659 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) { 4660 if (getLexer().isNot(AsmToken::EndOfStatement)) 4661 return TokError("unexpected token in '" + Directive + "' directive"); 4662 4663 // If we are inside a macro instantiation, terminate the current 4664 // instantiation. 4665 if (isInsideMacroInstantiation()) { 4666 handleMacroExit(); 4667 return false; 4668 } 4669 4670 // Otherwise, this .endmacro is a stray entry in the file; well formed 4671 // .endmacro directives are handled during the macro definition parsing. 4672 return TokError("unexpected '" + Directive + "' in file, " 4673 "no current macro definition"); 4674 } 4675 4676 /// parseDirectivePurgeMacro 4677 /// ::= .purgem 4678 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) { 4679 StringRef Name; 4680 SMLoc Loc; 4681 if (parseTokenLoc(Loc) || 4682 check(parseIdentifier(Name), Loc, 4683 "expected identifier in '.purgem' directive") || 4684 parseToken(AsmToken::EndOfStatement, 4685 "unexpected token in '.purgem' directive")) 4686 return true; 4687 4688 if (!getContext().lookupMacro(Name)) 4689 return Error(DirectiveLoc, "macro '" + Name + "' is not defined"); 4690 4691 getContext().undefineMacro(Name); 4692 DEBUG_WITH_TYPE("asm-macros", dbgs() 4693 << "Un-defining macro: " << Name << "\n"); 4694 return false; 4695 } 4696 4697 /// parseDirectiveBundleAlignMode 4698 /// ::= {.bundle_align_mode} expression 4699 bool AsmParser::parseDirectiveBundleAlignMode() { 4700 // Expect a single argument: an expression that evaluates to a constant 4701 // in the inclusive range 0-30. 4702 SMLoc ExprLoc = getLexer().getLoc(); 4703 int64_t AlignSizePow2; 4704 if (checkForValidSection() || parseAbsoluteExpression(AlignSizePow2) || 4705 parseToken(AsmToken::EndOfStatement, "unexpected token after expression " 4706 "in '.bundle_align_mode' " 4707 "directive") || 4708 check(AlignSizePow2 < 0 || AlignSizePow2 > 30, ExprLoc, 4709 "invalid bundle alignment size (expected between 0 and 30)")) 4710 return true; 4711 4712 // Because of AlignSizePow2's verified range we can safely truncate it to 4713 // unsigned. 4714 getStreamer().emitBundleAlignMode(static_cast<unsigned>(AlignSizePow2)); 4715 return false; 4716 } 4717 4718 /// parseDirectiveBundleLock 4719 /// ::= {.bundle_lock} [align_to_end] 4720 bool AsmParser::parseDirectiveBundleLock() { 4721 if (checkForValidSection()) 4722 return true; 4723 bool AlignToEnd = false; 4724 4725 StringRef Option; 4726 SMLoc Loc = getTok().getLoc(); 4727 const char *kInvalidOptionError = 4728 "invalid option for '.bundle_lock' directive"; 4729 4730 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4731 if (check(parseIdentifier(Option), Loc, kInvalidOptionError) || 4732 check(Option != "align_to_end", Loc, kInvalidOptionError) || 4733 parseToken(AsmToken::EndOfStatement, 4734 "unexpected token after '.bundle_lock' directive option")) 4735 return true; 4736 AlignToEnd = true; 4737 } 4738 4739 getStreamer().emitBundleLock(AlignToEnd); 4740 return false; 4741 } 4742 4743 /// parseDirectiveBundleLock 4744 /// ::= {.bundle_lock} 4745 bool AsmParser::parseDirectiveBundleUnlock() { 4746 if (checkForValidSection() || 4747 parseToken(AsmToken::EndOfStatement, 4748 "unexpected token in '.bundle_unlock' directive")) 4749 return true; 4750 4751 getStreamer().emitBundleUnlock(); 4752 return false; 4753 } 4754 4755 /// parseDirectiveSpace 4756 /// ::= (.skip | .space) expression [ , expression ] 4757 bool AsmParser::parseDirectiveSpace(StringRef IDVal) { 4758 SMLoc NumBytesLoc = Lexer.getLoc(); 4759 const MCExpr *NumBytes; 4760 if (checkForValidSection() || parseExpression(NumBytes)) 4761 return true; 4762 4763 int64_t FillExpr = 0; 4764 if (parseOptionalToken(AsmToken::Comma)) 4765 if (parseAbsoluteExpression(FillExpr)) 4766 return addErrorSuffix("in '" + Twine(IDVal) + "' directive"); 4767 if (parseToken(AsmToken::EndOfStatement)) 4768 return addErrorSuffix("in '" + Twine(IDVal) + "' directive"); 4769 4770 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. 4771 getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc); 4772 4773 return false; 4774 } 4775 4776 /// parseDirectiveDCB 4777 /// ::= .dcb.{b, l, w} expression, expression 4778 bool AsmParser::parseDirectiveDCB(StringRef IDVal, unsigned Size) { 4779 SMLoc NumValuesLoc = Lexer.getLoc(); 4780 int64_t NumValues; 4781 if (checkForValidSection() || parseAbsoluteExpression(NumValues)) 4782 return true; 4783 4784 if (NumValues < 0) { 4785 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4786 return false; 4787 } 4788 4789 if (parseToken(AsmToken::Comma, 4790 "unexpected token in '" + Twine(IDVal) + "' directive")) 4791 return true; 4792 4793 const MCExpr *Value; 4794 SMLoc ExprLoc = getLexer().getLoc(); 4795 if (parseExpression(Value)) 4796 return true; 4797 4798 // Special case constant expressions to match code generator. 4799 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 4800 assert(Size <= 8 && "Invalid size"); 4801 uint64_t IntValue = MCE->getValue(); 4802 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 4803 return Error(ExprLoc, "literal value out of range for directive"); 4804 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4805 getStreamer().emitIntValue(IntValue, Size); 4806 } else { 4807 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4808 getStreamer().emitValue(Value, Size, ExprLoc); 4809 } 4810 4811 if (parseToken(AsmToken::EndOfStatement, 4812 "unexpected token in '" + Twine(IDVal) + "' directive")) 4813 return true; 4814 4815 return false; 4816 } 4817 4818 /// parseDirectiveRealDCB 4819 /// ::= .dcb.{d, s} expression, expression 4820 bool AsmParser::parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &Semantics) { 4821 SMLoc NumValuesLoc = Lexer.getLoc(); 4822 int64_t NumValues; 4823 if (checkForValidSection() || parseAbsoluteExpression(NumValues)) 4824 return true; 4825 4826 if (NumValues < 0) { 4827 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4828 return false; 4829 } 4830 4831 if (parseToken(AsmToken::Comma, 4832 "unexpected token in '" + Twine(IDVal) + "' directive")) 4833 return true; 4834 4835 APInt AsInt; 4836 if (parseRealValue(Semantics, AsInt)) 4837 return true; 4838 4839 if (parseToken(AsmToken::EndOfStatement, 4840 "unexpected token in '" + Twine(IDVal) + "' directive")) 4841 return true; 4842 4843 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4844 getStreamer().emitIntValue(AsInt.getLimitedValue(), 4845 AsInt.getBitWidth() / 8); 4846 4847 return false; 4848 } 4849 4850 /// parseDirectiveDS 4851 /// ::= .ds.{b, d, l, p, s, w, x} expression 4852 bool AsmParser::parseDirectiveDS(StringRef IDVal, unsigned Size) { 4853 SMLoc NumValuesLoc = Lexer.getLoc(); 4854 int64_t NumValues; 4855 if (checkForValidSection() || parseAbsoluteExpression(NumValues)) 4856 return true; 4857 4858 if (NumValues < 0) { 4859 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4860 return false; 4861 } 4862 4863 if (parseToken(AsmToken::EndOfStatement, 4864 "unexpected token in '" + Twine(IDVal) + "' directive")) 4865 return true; 4866 4867 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4868 getStreamer().emitFill(Size, 0); 4869 4870 return false; 4871 } 4872 4873 /// parseDirectiveLEB128 4874 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ] 4875 bool AsmParser::parseDirectiveLEB128(bool Signed) { 4876 if (checkForValidSection()) 4877 return true; 4878 4879 auto parseOp = [&]() -> bool { 4880 const MCExpr *Value; 4881 if (parseExpression(Value)) 4882 return true; 4883 if (Signed) 4884 getStreamer().emitSLEB128Value(Value); 4885 else 4886 getStreamer().emitULEB128Value(Value); 4887 return false; 4888 }; 4889 4890 if (parseMany(parseOp)) 4891 return addErrorSuffix(" in directive"); 4892 4893 return false; 4894 } 4895 4896 /// parseDirectiveSymbolAttribute 4897 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ] 4898 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) { 4899 auto parseOp = [&]() -> bool { 4900 StringRef Name; 4901 SMLoc Loc = getTok().getLoc(); 4902 if (parseIdentifier(Name)) 4903 return Error(Loc, "expected identifier"); 4904 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4905 4906 // Assembler local symbols don't make any sense here. Complain loudly. 4907 if (Sym->isTemporary()) 4908 return Error(Loc, "non-local symbol required"); 4909 4910 if (!getStreamer().emitSymbolAttribute(Sym, Attr)) 4911 return Error(Loc, "unable to emit symbol attribute"); 4912 return false; 4913 }; 4914 4915 if (parseMany(parseOp)) 4916 return addErrorSuffix(" in directive"); 4917 return false; 4918 } 4919 4920 /// parseDirectiveComm 4921 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ] 4922 bool AsmParser::parseDirectiveComm(bool IsLocal) { 4923 if (checkForValidSection()) 4924 return true; 4925 4926 SMLoc IDLoc = getLexer().getLoc(); 4927 StringRef Name; 4928 if (parseIdentifier(Name)) 4929 return TokError("expected identifier in directive"); 4930 4931 // Handle the identifier as the key symbol. 4932 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4933 4934 if (getLexer().isNot(AsmToken::Comma)) 4935 return TokError("unexpected token in directive"); 4936 Lex(); 4937 4938 int64_t Size; 4939 SMLoc SizeLoc = getLexer().getLoc(); 4940 if (parseAbsoluteExpression(Size)) 4941 return true; 4942 4943 int64_t Pow2Alignment = 0; 4944 SMLoc Pow2AlignmentLoc; 4945 if (getLexer().is(AsmToken::Comma)) { 4946 Lex(); 4947 Pow2AlignmentLoc = getLexer().getLoc(); 4948 if (parseAbsoluteExpression(Pow2Alignment)) 4949 return true; 4950 4951 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType(); 4952 if (IsLocal && LCOMM == LCOMM::NoAlignment) 4953 return Error(Pow2AlignmentLoc, "alignment not supported on this target"); 4954 4955 // If this target takes alignments in bytes (not log) validate and convert. 4956 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) || 4957 (IsLocal && LCOMM == LCOMM::ByteAlignment)) { 4958 if (!isPowerOf2_64(Pow2Alignment)) 4959 return Error(Pow2AlignmentLoc, "alignment must be a power of 2"); 4960 Pow2Alignment = Log2_64(Pow2Alignment); 4961 } 4962 } 4963 4964 if (parseToken(AsmToken::EndOfStatement, 4965 "unexpected token in '.comm' or '.lcomm' directive")) 4966 return true; 4967 4968 // NOTE: a size of zero for a .comm should create a undefined symbol 4969 // but a size of .lcomm creates a bss symbol of size zero. 4970 if (Size < 0) 4971 return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't " 4972 "be less than zero"); 4973 4974 // NOTE: The alignment in the directive is a power of 2 value, the assembler 4975 // may internally end up wanting an alignment in bytes. 4976 // FIXME: Diagnose overflow. 4977 if (Pow2Alignment < 0) 4978 return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive " 4979 "alignment, can't be less than zero"); 4980 4981 Sym->redefineIfPossible(); 4982 if (!Sym->isUndefined()) 4983 return Error(IDLoc, "invalid symbol redefinition"); 4984 4985 // Create the Symbol as a common or local common with Size and Pow2Alignment 4986 if (IsLocal) { 4987 getStreamer().emitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment); 4988 return false; 4989 } 4990 4991 getStreamer().emitCommonSymbol(Sym, Size, 1 << Pow2Alignment); 4992 return false; 4993 } 4994 4995 /// parseDirectiveAbort 4996 /// ::= .abort [... message ...] 4997 bool AsmParser::parseDirectiveAbort() { 4998 // FIXME: Use loc from directive. 4999 SMLoc Loc = getLexer().getLoc(); 5000 5001 StringRef Str = parseStringToEndOfStatement(); 5002 if (parseToken(AsmToken::EndOfStatement, 5003 "unexpected token in '.abort' directive")) 5004 return true; 5005 5006 if (Str.empty()) 5007 return Error(Loc, ".abort detected. Assembly stopping."); 5008 else 5009 return Error(Loc, ".abort '" + Str + "' detected. Assembly stopping."); 5010 // FIXME: Actually abort assembly here. 5011 5012 return false; 5013 } 5014 5015 /// parseDirectiveInclude 5016 /// ::= .include "filename" 5017 bool AsmParser::parseDirectiveInclude() { 5018 // Allow the strings to have escaped octal character sequence. 5019 std::string Filename; 5020 SMLoc IncludeLoc = getTok().getLoc(); 5021 5022 if (check(getTok().isNot(AsmToken::String), 5023 "expected string in '.include' directive") || 5024 parseEscapedString(Filename) || 5025 check(getTok().isNot(AsmToken::EndOfStatement), 5026 "unexpected token in '.include' directive") || 5027 // Attempt to switch the lexer to the included file before consuming the 5028 // end of statement to avoid losing it when we switch. 5029 check(enterIncludeFile(Filename), IncludeLoc, 5030 "Could not find include file '" + Filename + "'")) 5031 return true; 5032 5033 return false; 5034 } 5035 5036 /// parseDirectiveIncbin 5037 /// ::= .incbin "filename" [ , skip [ , count ] ] 5038 bool AsmParser::parseDirectiveIncbin() { 5039 // Allow the strings to have escaped octal character sequence. 5040 std::string Filename; 5041 SMLoc IncbinLoc = getTok().getLoc(); 5042 if (check(getTok().isNot(AsmToken::String), 5043 "expected string in '.incbin' directive") || 5044 parseEscapedString(Filename)) 5045 return true; 5046 5047 int64_t Skip = 0; 5048 const MCExpr *Count = nullptr; 5049 SMLoc SkipLoc, CountLoc; 5050 if (parseOptionalToken(AsmToken::Comma)) { 5051 // The skip expression can be omitted while specifying the count, e.g: 5052 // .incbin "filename",,4 5053 if (getTok().isNot(AsmToken::Comma)) { 5054 if (parseTokenLoc(SkipLoc) || parseAbsoluteExpression(Skip)) 5055 return true; 5056 } 5057 if (parseOptionalToken(AsmToken::Comma)) { 5058 CountLoc = getTok().getLoc(); 5059 if (parseExpression(Count)) 5060 return true; 5061 } 5062 } 5063 5064 if (parseToken(AsmToken::EndOfStatement, 5065 "unexpected token in '.incbin' directive")) 5066 return true; 5067 5068 if (check(Skip < 0, SkipLoc, "skip is negative")) 5069 return true; 5070 5071 // Attempt to process the included file. 5072 if (processIncbinFile(Filename, Skip, Count, CountLoc)) 5073 return Error(IncbinLoc, "Could not find incbin file '" + Filename + "'"); 5074 return false; 5075 } 5076 5077 /// parseDirectiveIf 5078 /// ::= .if{,eq,ge,gt,le,lt,ne} expression 5079 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) { 5080 TheCondStack.push_back(TheCondState); 5081 TheCondState.TheCond = AsmCond::IfCond; 5082 if (TheCondState.Ignore) { 5083 eatToEndOfStatement(); 5084 } else { 5085 int64_t ExprValue; 5086 if (parseAbsoluteExpression(ExprValue) || 5087 parseToken(AsmToken::EndOfStatement, 5088 "unexpected token in '.if' directive")) 5089 return true; 5090 5091 switch (DirKind) { 5092 default: 5093 llvm_unreachable("unsupported directive"); 5094 case DK_IF: 5095 case DK_IFNE: 5096 break; 5097 case DK_IFEQ: 5098 ExprValue = ExprValue == 0; 5099 break; 5100 case DK_IFGE: 5101 ExprValue = ExprValue >= 0; 5102 break; 5103 case DK_IFGT: 5104 ExprValue = ExprValue > 0; 5105 break; 5106 case DK_IFLE: 5107 ExprValue = ExprValue <= 0; 5108 break; 5109 case DK_IFLT: 5110 ExprValue = ExprValue < 0; 5111 break; 5112 } 5113 5114 TheCondState.CondMet = ExprValue; 5115 TheCondState.Ignore = !TheCondState.CondMet; 5116 } 5117 5118 return false; 5119 } 5120 5121 /// parseDirectiveIfb 5122 /// ::= .ifb string 5123 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) { 5124 TheCondStack.push_back(TheCondState); 5125 TheCondState.TheCond = AsmCond::IfCond; 5126 5127 if (TheCondState.Ignore) { 5128 eatToEndOfStatement(); 5129 } else { 5130 StringRef Str = parseStringToEndOfStatement(); 5131 5132 if (parseToken(AsmToken::EndOfStatement, 5133 "unexpected token in '.ifb' directive")) 5134 return true; 5135 5136 TheCondState.CondMet = ExpectBlank == Str.empty(); 5137 TheCondState.Ignore = !TheCondState.CondMet; 5138 } 5139 5140 return false; 5141 } 5142 5143 /// parseDirectiveIfc 5144 /// ::= .ifc string1, string2 5145 /// ::= .ifnc string1, string2 5146 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) { 5147 TheCondStack.push_back(TheCondState); 5148 TheCondState.TheCond = AsmCond::IfCond; 5149 5150 if (TheCondState.Ignore) { 5151 eatToEndOfStatement(); 5152 } else { 5153 StringRef Str1 = parseStringToComma(); 5154 5155 if (parseToken(AsmToken::Comma, "unexpected token in '.ifc' directive")) 5156 return true; 5157 5158 StringRef Str2 = parseStringToEndOfStatement(); 5159 5160 if (parseToken(AsmToken::EndOfStatement, 5161 "unexpected token in '.ifc' directive")) 5162 return true; 5163 5164 TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim()); 5165 TheCondState.Ignore = !TheCondState.CondMet; 5166 } 5167 5168 return false; 5169 } 5170 5171 /// parseDirectiveIfeqs 5172 /// ::= .ifeqs string1, string2 5173 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) { 5174 if (Lexer.isNot(AsmToken::String)) { 5175 if (ExpectEqual) 5176 return TokError("expected string parameter for '.ifeqs' directive"); 5177 return TokError("expected string parameter for '.ifnes' directive"); 5178 } 5179 5180 StringRef String1 = getTok().getStringContents(); 5181 Lex(); 5182 5183 if (Lexer.isNot(AsmToken::Comma)) { 5184 if (ExpectEqual) 5185 return TokError( 5186 "expected comma after first string for '.ifeqs' directive"); 5187 return TokError("expected comma after first string for '.ifnes' directive"); 5188 } 5189 5190 Lex(); 5191 5192 if (Lexer.isNot(AsmToken::String)) { 5193 if (ExpectEqual) 5194 return TokError("expected string parameter for '.ifeqs' directive"); 5195 return TokError("expected string parameter for '.ifnes' directive"); 5196 } 5197 5198 StringRef String2 = getTok().getStringContents(); 5199 Lex(); 5200 5201 TheCondStack.push_back(TheCondState); 5202 TheCondState.TheCond = AsmCond::IfCond; 5203 TheCondState.CondMet = ExpectEqual == (String1 == String2); 5204 TheCondState.Ignore = !TheCondState.CondMet; 5205 5206 return false; 5207 } 5208 5209 /// parseDirectiveIfdef 5210 /// ::= .ifdef symbol 5211 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) { 5212 StringRef Name; 5213 TheCondStack.push_back(TheCondState); 5214 TheCondState.TheCond = AsmCond::IfCond; 5215 5216 if (TheCondState.Ignore) { 5217 eatToEndOfStatement(); 5218 } else { 5219 if (check(parseIdentifier(Name), "expected identifier after '.ifdef'") || 5220 parseToken(AsmToken::EndOfStatement, "unexpected token in '.ifdef'")) 5221 return true; 5222 5223 MCSymbol *Sym = getContext().lookupSymbol(Name); 5224 5225 if (expect_defined) 5226 TheCondState.CondMet = (Sym && !Sym->isUndefined(false)); 5227 else 5228 TheCondState.CondMet = (!Sym || Sym->isUndefined(false)); 5229 TheCondState.Ignore = !TheCondState.CondMet; 5230 } 5231 5232 return false; 5233 } 5234 5235 /// parseDirectiveElseIf 5236 /// ::= .elseif expression 5237 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) { 5238 if (TheCondState.TheCond != AsmCond::IfCond && 5239 TheCondState.TheCond != AsmCond::ElseIfCond) 5240 return Error(DirectiveLoc, "Encountered a .elseif that doesn't follow an" 5241 " .if or an .elseif"); 5242 TheCondState.TheCond = AsmCond::ElseIfCond; 5243 5244 bool LastIgnoreState = false; 5245 if (!TheCondStack.empty()) 5246 LastIgnoreState = TheCondStack.back().Ignore; 5247 if (LastIgnoreState || TheCondState.CondMet) { 5248 TheCondState.Ignore = true; 5249 eatToEndOfStatement(); 5250 } else { 5251 int64_t ExprValue; 5252 if (parseAbsoluteExpression(ExprValue)) 5253 return true; 5254 5255 if (parseToken(AsmToken::EndOfStatement, 5256 "unexpected token in '.elseif' directive")) 5257 return true; 5258 5259 TheCondState.CondMet = ExprValue; 5260 TheCondState.Ignore = !TheCondState.CondMet; 5261 } 5262 5263 return false; 5264 } 5265 5266 /// parseDirectiveElse 5267 /// ::= .else 5268 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) { 5269 if (parseToken(AsmToken::EndOfStatement, 5270 "unexpected token in '.else' directive")) 5271 return true; 5272 5273 if (TheCondState.TheCond != AsmCond::IfCond && 5274 TheCondState.TheCond != AsmCond::ElseIfCond) 5275 return Error(DirectiveLoc, "Encountered a .else that doesn't follow " 5276 " an .if or an .elseif"); 5277 TheCondState.TheCond = AsmCond::ElseCond; 5278 bool LastIgnoreState = false; 5279 if (!TheCondStack.empty()) 5280 LastIgnoreState = TheCondStack.back().Ignore; 5281 if (LastIgnoreState || TheCondState.CondMet) 5282 TheCondState.Ignore = true; 5283 else 5284 TheCondState.Ignore = false; 5285 5286 return false; 5287 } 5288 5289 /// parseDirectiveEnd 5290 /// ::= .end 5291 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) { 5292 if (parseToken(AsmToken::EndOfStatement, 5293 "unexpected token in '.end' directive")) 5294 return true; 5295 5296 while (Lexer.isNot(AsmToken::Eof)) 5297 Lexer.Lex(); 5298 5299 return false; 5300 } 5301 5302 /// parseDirectiveError 5303 /// ::= .err 5304 /// ::= .error [string] 5305 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) { 5306 if (!TheCondStack.empty()) { 5307 if (TheCondStack.back().Ignore) { 5308 eatToEndOfStatement(); 5309 return false; 5310 } 5311 } 5312 5313 if (!WithMessage) 5314 return Error(L, ".err encountered"); 5315 5316 StringRef Message = ".error directive invoked in source file"; 5317 if (Lexer.isNot(AsmToken::EndOfStatement)) { 5318 if (Lexer.isNot(AsmToken::String)) 5319 return TokError(".error argument must be a string"); 5320 5321 Message = getTok().getStringContents(); 5322 Lex(); 5323 } 5324 5325 return Error(L, Message); 5326 } 5327 5328 /// parseDirectiveWarning 5329 /// ::= .warning [string] 5330 bool AsmParser::parseDirectiveWarning(SMLoc L) { 5331 if (!TheCondStack.empty()) { 5332 if (TheCondStack.back().Ignore) { 5333 eatToEndOfStatement(); 5334 return false; 5335 } 5336 } 5337 5338 StringRef Message = ".warning directive invoked in source file"; 5339 5340 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 5341 if (Lexer.isNot(AsmToken::String)) 5342 return TokError(".warning argument must be a string"); 5343 5344 Message = getTok().getStringContents(); 5345 Lex(); 5346 if (parseToken(AsmToken::EndOfStatement, 5347 "expected end of statement in '.warning' directive")) 5348 return true; 5349 } 5350 5351 return Warning(L, Message); 5352 } 5353 5354 /// parseDirectiveEndIf 5355 /// ::= .endif 5356 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) { 5357 if (parseToken(AsmToken::EndOfStatement, 5358 "unexpected token in '.endif' directive")) 5359 return true; 5360 5361 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty()) 5362 return Error(DirectiveLoc, "Encountered a .endif that doesn't follow " 5363 "an .if or .else"); 5364 if (!TheCondStack.empty()) { 5365 TheCondState = TheCondStack.back(); 5366 TheCondStack.pop_back(); 5367 } 5368 5369 return false; 5370 } 5371 5372 void AsmParser::initializeDirectiveKindMap() { 5373 /* Lookup will be done with the directive 5374 * converted to lower case, so all these 5375 * keys should be lower case. 5376 * (target specific directives are handled 5377 * elsewhere) 5378 */ 5379 DirectiveKindMap[".set"] = DK_SET; 5380 DirectiveKindMap[".equ"] = DK_EQU; 5381 DirectiveKindMap[".equiv"] = DK_EQUIV; 5382 DirectiveKindMap[".ascii"] = DK_ASCII; 5383 DirectiveKindMap[".asciz"] = DK_ASCIZ; 5384 DirectiveKindMap[".string"] = DK_STRING; 5385 DirectiveKindMap[".byte"] = DK_BYTE; 5386 DirectiveKindMap[".short"] = DK_SHORT; 5387 DirectiveKindMap[".value"] = DK_VALUE; 5388 DirectiveKindMap[".2byte"] = DK_2BYTE; 5389 DirectiveKindMap[".long"] = DK_LONG; 5390 DirectiveKindMap[".int"] = DK_INT; 5391 DirectiveKindMap[".4byte"] = DK_4BYTE; 5392 DirectiveKindMap[".quad"] = DK_QUAD; 5393 DirectiveKindMap[".8byte"] = DK_8BYTE; 5394 DirectiveKindMap[".octa"] = DK_OCTA; 5395 DirectiveKindMap[".single"] = DK_SINGLE; 5396 DirectiveKindMap[".float"] = DK_FLOAT; 5397 DirectiveKindMap[".double"] = DK_DOUBLE; 5398 DirectiveKindMap[".align"] = DK_ALIGN; 5399 DirectiveKindMap[".align32"] = DK_ALIGN32; 5400 DirectiveKindMap[".balign"] = DK_BALIGN; 5401 DirectiveKindMap[".balignw"] = DK_BALIGNW; 5402 DirectiveKindMap[".balignl"] = DK_BALIGNL; 5403 DirectiveKindMap[".p2align"] = DK_P2ALIGN; 5404 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW; 5405 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL; 5406 DirectiveKindMap[".org"] = DK_ORG; 5407 DirectiveKindMap[".fill"] = DK_FILL; 5408 DirectiveKindMap[".zero"] = DK_ZERO; 5409 DirectiveKindMap[".extern"] = DK_EXTERN; 5410 DirectiveKindMap[".globl"] = DK_GLOBL; 5411 DirectiveKindMap[".global"] = DK_GLOBAL; 5412 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE; 5413 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP; 5414 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER; 5415 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN; 5416 DirectiveKindMap[".reference"] = DK_REFERENCE; 5417 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION; 5418 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE; 5419 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN; 5420 DirectiveKindMap[".cold"] = DK_COLD; 5421 DirectiveKindMap[".comm"] = DK_COMM; 5422 DirectiveKindMap[".common"] = DK_COMMON; 5423 DirectiveKindMap[".lcomm"] = DK_LCOMM; 5424 DirectiveKindMap[".abort"] = DK_ABORT; 5425 DirectiveKindMap[".include"] = DK_INCLUDE; 5426 DirectiveKindMap[".incbin"] = DK_INCBIN; 5427 DirectiveKindMap[".code16"] = DK_CODE16; 5428 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC; 5429 DirectiveKindMap[".rept"] = DK_REPT; 5430 DirectiveKindMap[".rep"] = DK_REPT; 5431 DirectiveKindMap[".irp"] = DK_IRP; 5432 DirectiveKindMap[".irpc"] = DK_IRPC; 5433 DirectiveKindMap[".endr"] = DK_ENDR; 5434 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE; 5435 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK; 5436 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK; 5437 DirectiveKindMap[".if"] = DK_IF; 5438 DirectiveKindMap[".ifeq"] = DK_IFEQ; 5439 DirectiveKindMap[".ifge"] = DK_IFGE; 5440 DirectiveKindMap[".ifgt"] = DK_IFGT; 5441 DirectiveKindMap[".ifle"] = DK_IFLE; 5442 DirectiveKindMap[".iflt"] = DK_IFLT; 5443 DirectiveKindMap[".ifne"] = DK_IFNE; 5444 DirectiveKindMap[".ifb"] = DK_IFB; 5445 DirectiveKindMap[".ifnb"] = DK_IFNB; 5446 DirectiveKindMap[".ifc"] = DK_IFC; 5447 DirectiveKindMap[".ifeqs"] = DK_IFEQS; 5448 DirectiveKindMap[".ifnc"] = DK_IFNC; 5449 DirectiveKindMap[".ifnes"] = DK_IFNES; 5450 DirectiveKindMap[".ifdef"] = DK_IFDEF; 5451 DirectiveKindMap[".ifndef"] = DK_IFNDEF; 5452 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF; 5453 DirectiveKindMap[".elseif"] = DK_ELSEIF; 5454 DirectiveKindMap[".else"] = DK_ELSE; 5455 DirectiveKindMap[".end"] = DK_END; 5456 DirectiveKindMap[".endif"] = DK_ENDIF; 5457 DirectiveKindMap[".skip"] = DK_SKIP; 5458 DirectiveKindMap[".space"] = DK_SPACE; 5459 DirectiveKindMap[".file"] = DK_FILE; 5460 DirectiveKindMap[".line"] = DK_LINE; 5461 DirectiveKindMap[".loc"] = DK_LOC; 5462 DirectiveKindMap[".stabs"] = DK_STABS; 5463 DirectiveKindMap[".cv_file"] = DK_CV_FILE; 5464 DirectiveKindMap[".cv_func_id"] = DK_CV_FUNC_ID; 5465 DirectiveKindMap[".cv_loc"] = DK_CV_LOC; 5466 DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE; 5467 DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE; 5468 DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID; 5469 DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE; 5470 DirectiveKindMap[".cv_string"] = DK_CV_STRING; 5471 DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE; 5472 DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS; 5473 DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET; 5474 DirectiveKindMap[".cv_fpo_data"] = DK_CV_FPO_DATA; 5475 DirectiveKindMap[".sleb128"] = DK_SLEB128; 5476 DirectiveKindMap[".uleb128"] = DK_ULEB128; 5477 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS; 5478 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC; 5479 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC; 5480 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA; 5481 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET; 5482 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET; 5483 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER; 5484 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET; 5485 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET; 5486 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY; 5487 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA; 5488 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE; 5489 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE; 5490 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE; 5491 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE; 5492 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE; 5493 DirectiveKindMap[".cfi_return_column"] = DK_CFI_RETURN_COLUMN; 5494 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME; 5495 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED; 5496 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER; 5497 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE; 5498 DirectiveKindMap[".cfi_b_key_frame"] = DK_CFI_B_KEY_FRAME; 5499 DirectiveKindMap[".macros_on"] = DK_MACROS_ON; 5500 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF; 5501 DirectiveKindMap[".macro"] = DK_MACRO; 5502 DirectiveKindMap[".exitm"] = DK_EXITM; 5503 DirectiveKindMap[".endm"] = DK_ENDM; 5504 DirectiveKindMap[".endmacro"] = DK_ENDMACRO; 5505 DirectiveKindMap[".purgem"] = DK_PURGEM; 5506 DirectiveKindMap[".err"] = DK_ERR; 5507 DirectiveKindMap[".error"] = DK_ERROR; 5508 DirectiveKindMap[".warning"] = DK_WARNING; 5509 DirectiveKindMap[".altmacro"] = DK_ALTMACRO; 5510 DirectiveKindMap[".noaltmacro"] = DK_NOALTMACRO; 5511 DirectiveKindMap[".reloc"] = DK_RELOC; 5512 DirectiveKindMap[".dc"] = DK_DC; 5513 DirectiveKindMap[".dc.a"] = DK_DC_A; 5514 DirectiveKindMap[".dc.b"] = DK_DC_B; 5515 DirectiveKindMap[".dc.d"] = DK_DC_D; 5516 DirectiveKindMap[".dc.l"] = DK_DC_L; 5517 DirectiveKindMap[".dc.s"] = DK_DC_S; 5518 DirectiveKindMap[".dc.w"] = DK_DC_W; 5519 DirectiveKindMap[".dc.x"] = DK_DC_X; 5520 DirectiveKindMap[".dcb"] = DK_DCB; 5521 DirectiveKindMap[".dcb.b"] = DK_DCB_B; 5522 DirectiveKindMap[".dcb.d"] = DK_DCB_D; 5523 DirectiveKindMap[".dcb.l"] = DK_DCB_L; 5524 DirectiveKindMap[".dcb.s"] = DK_DCB_S; 5525 DirectiveKindMap[".dcb.w"] = DK_DCB_W; 5526 DirectiveKindMap[".dcb.x"] = DK_DCB_X; 5527 DirectiveKindMap[".ds"] = DK_DS; 5528 DirectiveKindMap[".ds.b"] = DK_DS_B; 5529 DirectiveKindMap[".ds.d"] = DK_DS_D; 5530 DirectiveKindMap[".ds.l"] = DK_DS_L; 5531 DirectiveKindMap[".ds.p"] = DK_DS_P; 5532 DirectiveKindMap[".ds.s"] = DK_DS_S; 5533 DirectiveKindMap[".ds.w"] = DK_DS_W; 5534 DirectiveKindMap[".ds.x"] = DK_DS_X; 5535 DirectiveKindMap[".print"] = DK_PRINT; 5536 DirectiveKindMap[".addrsig"] = DK_ADDRSIG; 5537 DirectiveKindMap[".addrsig_sym"] = DK_ADDRSIG_SYM; 5538 DirectiveKindMap[".pseudoprobe"] = DK_PSEUDO_PROBE; 5539 } 5540 5541 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) { 5542 AsmToken EndToken, StartToken = getTok(); 5543 5544 unsigned NestLevel = 0; 5545 while (true) { 5546 // Check whether we have reached the end of the file. 5547 if (getLexer().is(AsmToken::Eof)) { 5548 printError(DirectiveLoc, "no matching '.endr' in definition"); 5549 return nullptr; 5550 } 5551 5552 if (Lexer.is(AsmToken::Identifier) && 5553 (getTok().getIdentifier() == ".rep" || 5554 getTok().getIdentifier() == ".rept" || 5555 getTok().getIdentifier() == ".irp" || 5556 getTok().getIdentifier() == ".irpc")) { 5557 ++NestLevel; 5558 } 5559 5560 // Otherwise, check whether we have reached the .endr. 5561 if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") { 5562 if (NestLevel == 0) { 5563 EndToken = getTok(); 5564 Lex(); 5565 if (Lexer.isNot(AsmToken::EndOfStatement)) { 5566 printError(getTok().getLoc(), 5567 "unexpected token in '.endr' directive"); 5568 return nullptr; 5569 } 5570 break; 5571 } 5572 --NestLevel; 5573 } 5574 5575 // Otherwise, scan till the end of the statement. 5576 eatToEndOfStatement(); 5577 } 5578 5579 const char *BodyStart = StartToken.getLoc().getPointer(); 5580 const char *BodyEnd = EndToken.getLoc().getPointer(); 5581 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 5582 5583 // We Are Anonymous. 5584 MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters()); 5585 return &MacroLikeBodies.back(); 5586 } 5587 5588 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 5589 raw_svector_ostream &OS) { 5590 OS << ".endr\n"; 5591 5592 std::unique_ptr<MemoryBuffer> Instantiation = 5593 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 5594 5595 // Create the macro instantiation object and add to the current macro 5596 // instantiation stack. 5597 MacroInstantiation *MI = new MacroInstantiation{ 5598 DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()}; 5599 ActiveMacros.push_back(MI); 5600 5601 // Jump to the macro instantiation and prime the lexer. 5602 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 5603 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 5604 Lex(); 5605 } 5606 5607 /// parseDirectiveRept 5608 /// ::= .rep | .rept count 5609 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) { 5610 const MCExpr *CountExpr; 5611 SMLoc CountLoc = getTok().getLoc(); 5612 if (parseExpression(CountExpr)) 5613 return true; 5614 5615 int64_t Count; 5616 if (!CountExpr->evaluateAsAbsolute(Count, getStreamer().getAssemblerPtr())) { 5617 return Error(CountLoc, "unexpected token in '" + Dir + "' directive"); 5618 } 5619 5620 if (check(Count < 0, CountLoc, "Count is negative") || 5621 parseToken(AsmToken::EndOfStatement, 5622 "unexpected token in '" + Dir + "' directive")) 5623 return true; 5624 5625 // Lex the rept definition. 5626 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5627 if (!M) 5628 return true; 5629 5630 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5631 // to hold the macro body with substitutions. 5632 SmallString<256> Buf; 5633 raw_svector_ostream OS(Buf); 5634 while (Count--) { 5635 // Note that the AtPseudoVariable is disabled for instantiations of .rep(t). 5636 if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc())) 5637 return true; 5638 } 5639 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5640 5641 return false; 5642 } 5643 5644 /// parseDirectiveIrp 5645 /// ::= .irp symbol,values 5646 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) { 5647 MCAsmMacroParameter Parameter; 5648 MCAsmMacroArguments A; 5649 if (check(parseIdentifier(Parameter.Name), 5650 "expected identifier in '.irp' directive") || 5651 parseToken(AsmToken::Comma, "expected comma in '.irp' directive") || 5652 parseMacroArguments(nullptr, A) || 5653 parseToken(AsmToken::EndOfStatement, "expected End of Statement")) 5654 return true; 5655 5656 // Lex the irp definition. 5657 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5658 if (!M) 5659 return true; 5660 5661 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5662 // to hold the macro body with substitutions. 5663 SmallString<256> Buf; 5664 raw_svector_ostream OS(Buf); 5665 5666 for (const MCAsmMacroArgument &Arg : A) { 5667 // Note that the AtPseudoVariable is enabled for instantiations of .irp. 5668 // This is undocumented, but GAS seems to support it. 5669 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) 5670 return true; 5671 } 5672 5673 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5674 5675 return false; 5676 } 5677 5678 /// parseDirectiveIrpc 5679 /// ::= .irpc symbol,values 5680 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) { 5681 MCAsmMacroParameter Parameter; 5682 MCAsmMacroArguments A; 5683 5684 if (check(parseIdentifier(Parameter.Name), 5685 "expected identifier in '.irpc' directive") || 5686 parseToken(AsmToken::Comma, "expected comma in '.irpc' directive") || 5687 parseMacroArguments(nullptr, A)) 5688 return true; 5689 5690 if (A.size() != 1 || A.front().size() != 1) 5691 return TokError("unexpected token in '.irpc' directive"); 5692 5693 // Eat the end of statement. 5694 if (parseToken(AsmToken::EndOfStatement, "expected end of statement")) 5695 return true; 5696 5697 // Lex the irpc definition. 5698 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5699 if (!M) 5700 return true; 5701 5702 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5703 // to hold the macro body with substitutions. 5704 SmallString<256> Buf; 5705 raw_svector_ostream OS(Buf); 5706 5707 StringRef Values = A.front().front().getString(); 5708 for (std::size_t I = 0, End = Values.size(); I != End; ++I) { 5709 MCAsmMacroArgument Arg; 5710 Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1)); 5711 5712 // Note that the AtPseudoVariable is enabled for instantiations of .irpc. 5713 // This is undocumented, but GAS seems to support it. 5714 if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc())) 5715 return true; 5716 } 5717 5718 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5719 5720 return false; 5721 } 5722 5723 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) { 5724 if (ActiveMacros.empty()) 5725 return TokError("unmatched '.endr' directive"); 5726 5727 // The only .repl that should get here are the ones created by 5728 // instantiateMacroLikeBody. 5729 assert(getLexer().is(AsmToken::EndOfStatement)); 5730 5731 handleMacroExit(); 5732 return false; 5733 } 5734 5735 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info, 5736 size_t Len) { 5737 const MCExpr *Value; 5738 SMLoc ExprLoc = getLexer().getLoc(); 5739 if (parseExpression(Value)) 5740 return true; 5741 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5742 if (!MCE) 5743 return Error(ExprLoc, "unexpected expression in _emit"); 5744 uint64_t IntValue = MCE->getValue(); 5745 if (!isUInt<8>(IntValue) && !isInt<8>(IntValue)) 5746 return Error(ExprLoc, "literal value out of range for directive"); 5747 5748 Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len); 5749 return false; 5750 } 5751 5752 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) { 5753 const MCExpr *Value; 5754 SMLoc ExprLoc = getLexer().getLoc(); 5755 if (parseExpression(Value)) 5756 return true; 5757 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5758 if (!MCE) 5759 return Error(ExprLoc, "unexpected expression in align"); 5760 uint64_t IntValue = MCE->getValue(); 5761 if (!isPowerOf2_64(IntValue)) 5762 return Error(ExprLoc, "literal value not a power of two greater then zero"); 5763 5764 Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue)); 5765 return false; 5766 } 5767 5768 bool AsmParser::parseDirectivePrint(SMLoc DirectiveLoc) { 5769 const AsmToken StrTok = getTok(); 5770 Lex(); 5771 if (StrTok.isNot(AsmToken::String) || StrTok.getString().front() != '"') 5772 return Error(DirectiveLoc, "expected double quoted string after .print"); 5773 if (parseToken(AsmToken::EndOfStatement, "expected end of statement")) 5774 return true; 5775 llvm::outs() << StrTok.getStringContents() << '\n'; 5776 return false; 5777 } 5778 5779 bool AsmParser::parseDirectiveAddrsig() { 5780 getStreamer().emitAddrsig(); 5781 return false; 5782 } 5783 5784 bool AsmParser::parseDirectiveAddrsigSym() { 5785 StringRef Name; 5786 if (check(parseIdentifier(Name), 5787 "expected identifier in '.addrsig_sym' directive")) 5788 return true; 5789 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 5790 getStreamer().emitAddrsigSym(Sym); 5791 return false; 5792 } 5793 5794 bool AsmParser::parseDirectivePseudoProbe() { 5795 int64_t Guid; 5796 int64_t Index; 5797 int64_t Type; 5798 int64_t Attr; 5799 5800 if (getLexer().is(AsmToken::Integer)) { 5801 if (parseIntToken(Guid, "unexpected token in '.pseudoprobe' directive")) 5802 return true; 5803 } 5804 5805 if (getLexer().is(AsmToken::Integer)) { 5806 if (parseIntToken(Index, "unexpected token in '.pseudoprobe' directive")) 5807 return true; 5808 } 5809 5810 if (getLexer().is(AsmToken::Integer)) { 5811 if (parseIntToken(Type, "unexpected token in '.pseudoprobe' directive")) 5812 return true; 5813 } 5814 5815 if (getLexer().is(AsmToken::Integer)) { 5816 if (parseIntToken(Attr, "unexpected token in '.pseudoprobe' directive")) 5817 return true; 5818 } 5819 5820 // Parse inline stack like @ GUID:11:12 @ GUID:1:11 @ GUID:3:21 5821 MCPseudoProbeInlineStack InlineStack; 5822 5823 while (getLexer().is(AsmToken::At)) { 5824 // eat @ 5825 Lex(); 5826 5827 int64_t CallerGuid = 0; 5828 if (getLexer().is(AsmToken::Integer)) { 5829 if (parseIntToken(CallerGuid, 5830 "unexpected token in '.pseudoprobe' directive")) 5831 return true; 5832 } 5833 5834 // eat colon 5835 if (getLexer().is(AsmToken::Colon)) 5836 Lex(); 5837 5838 int64_t CallerProbeId = 0; 5839 if (getLexer().is(AsmToken::Integer)) { 5840 if (parseIntToken(CallerProbeId, 5841 "unexpected token in '.pseudoprobe' directive")) 5842 return true; 5843 } 5844 5845 InlineSite Site(CallerGuid, CallerProbeId); 5846 InlineStack.push_back(Site); 5847 } 5848 5849 if (parseToken(AsmToken::EndOfStatement, 5850 "unexpected token in '.pseudoprobe' directive")) 5851 return true; 5852 5853 getStreamer().emitPseudoProbe(Guid, Index, Type, Attr, InlineStack); 5854 return false; 5855 } 5856 5857 // We are comparing pointers, but the pointers are relative to a single string. 5858 // Thus, this should always be deterministic. 5859 static int rewritesSort(const AsmRewrite *AsmRewriteA, 5860 const AsmRewrite *AsmRewriteB) { 5861 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer()) 5862 return -1; 5863 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer()) 5864 return 1; 5865 5866 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output 5867 // rewrite to the same location. Make sure the SizeDirective rewrite is 5868 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This 5869 // ensures the sort algorithm is stable. 5870 if (AsmRewritePrecedence[AsmRewriteA->Kind] > 5871 AsmRewritePrecedence[AsmRewriteB->Kind]) 5872 return -1; 5873 5874 if (AsmRewritePrecedence[AsmRewriteA->Kind] < 5875 AsmRewritePrecedence[AsmRewriteB->Kind]) 5876 return 1; 5877 llvm_unreachable("Unstable rewrite sort."); 5878 } 5879 5880 bool AsmParser::parseMSInlineAsm( 5881 void *AsmLoc, std::string &AsmString, unsigned &NumOutputs, 5882 unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool>> &OpDecls, 5883 SmallVectorImpl<std::string> &Constraints, 5884 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII, 5885 const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) { 5886 SmallVector<void *, 4> InputDecls; 5887 SmallVector<void *, 4> OutputDecls; 5888 SmallVector<bool, 4> InputDeclsAddressOf; 5889 SmallVector<bool, 4> OutputDeclsAddressOf; 5890 SmallVector<std::string, 4> InputConstraints; 5891 SmallVector<std::string, 4> OutputConstraints; 5892 SmallVector<unsigned, 4> ClobberRegs; 5893 5894 SmallVector<AsmRewrite, 4> AsmStrRewrites; 5895 5896 // Prime the lexer. 5897 Lex(); 5898 5899 // While we have input, parse each statement. 5900 unsigned InputIdx = 0; 5901 unsigned OutputIdx = 0; 5902 while (getLexer().isNot(AsmToken::Eof)) { 5903 // Parse curly braces marking block start/end 5904 if (parseCurlyBlockScope(AsmStrRewrites)) 5905 continue; 5906 5907 ParseStatementInfo Info(&AsmStrRewrites); 5908 bool StatementErr = parseStatement(Info, &SI); 5909 5910 if (StatementErr || Info.ParseError) { 5911 // Emit pending errors if any exist. 5912 printPendingErrors(); 5913 return true; 5914 } 5915 5916 // No pending error should exist here. 5917 assert(!hasPendingError() && "unexpected error from parseStatement"); 5918 5919 if (Info.Opcode == ~0U) 5920 continue; 5921 5922 const MCInstrDesc &Desc = MII->get(Info.Opcode); 5923 5924 // Build the list of clobbers, outputs and inputs. 5925 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) { 5926 MCParsedAsmOperand &Operand = *Info.ParsedOperands[i]; 5927 5928 // Register operand. 5929 if (Operand.isReg() && !Operand.needAddressOf() && 5930 !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) { 5931 unsigned NumDefs = Desc.getNumDefs(); 5932 // Clobber. 5933 if (NumDefs && Operand.getMCOperandNum() < NumDefs) 5934 ClobberRegs.push_back(Operand.getReg()); 5935 continue; 5936 } 5937 5938 // Expr/Input or Output. 5939 StringRef SymName = Operand.getSymName(); 5940 if (SymName.empty()) 5941 continue; 5942 5943 void *OpDecl = Operand.getOpDecl(); 5944 if (!OpDecl) 5945 continue; 5946 5947 StringRef Constraint = Operand.getConstraint(); 5948 if (Operand.isImm()) { 5949 // Offset as immediate 5950 if (Operand.isOffsetOfLocal()) 5951 Constraint = "r"; 5952 else 5953 Constraint = "i"; 5954 } 5955 5956 bool isOutput = (i == 1) && Desc.mayStore(); 5957 SMLoc Start = SMLoc::getFromPointer(SymName.data()); 5958 if (isOutput) { 5959 ++InputIdx; 5960 OutputDecls.push_back(OpDecl); 5961 OutputDeclsAddressOf.push_back(Operand.needAddressOf()); 5962 OutputConstraints.push_back(("=" + Constraint).str()); 5963 AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size()); 5964 } else { 5965 InputDecls.push_back(OpDecl); 5966 InputDeclsAddressOf.push_back(Operand.needAddressOf()); 5967 InputConstraints.push_back(Constraint.str()); 5968 if (Desc.OpInfo[i - 1].isBranchTarget()) 5969 AsmStrRewrites.emplace_back(AOK_CallInput, Start, SymName.size()); 5970 else 5971 AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size()); 5972 } 5973 } 5974 5975 // Consider implicit defs to be clobbers. Think of cpuid and push. 5976 ArrayRef<MCPhysReg> ImpDefs(Desc.getImplicitDefs(), 5977 Desc.getNumImplicitDefs()); 5978 llvm::append_range(ClobberRegs, ImpDefs); 5979 } 5980 5981 // Set the number of Outputs and Inputs. 5982 NumOutputs = OutputDecls.size(); 5983 NumInputs = InputDecls.size(); 5984 5985 // Set the unique clobbers. 5986 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end()); 5987 ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()), 5988 ClobberRegs.end()); 5989 Clobbers.assign(ClobberRegs.size(), std::string()); 5990 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) { 5991 raw_string_ostream OS(Clobbers[I]); 5992 IP->printRegName(OS, ClobberRegs[I]); 5993 } 5994 5995 // Merge the various outputs and inputs. Output are expected first. 5996 if (NumOutputs || NumInputs) { 5997 unsigned NumExprs = NumOutputs + NumInputs; 5998 OpDecls.resize(NumExprs); 5999 Constraints.resize(NumExprs); 6000 for (unsigned i = 0; i < NumOutputs; ++i) { 6001 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]); 6002 Constraints[i] = OutputConstraints[i]; 6003 } 6004 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) { 6005 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]); 6006 Constraints[j] = InputConstraints[i]; 6007 } 6008 } 6009 6010 // Build the IR assembly string. 6011 std::string AsmStringIR; 6012 raw_string_ostream OS(AsmStringIR); 6013 StringRef ASMString = 6014 SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer(); 6015 const char *AsmStart = ASMString.begin(); 6016 const char *AsmEnd = ASMString.end(); 6017 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort); 6018 for (auto it = AsmStrRewrites.begin(); it != AsmStrRewrites.end(); ++it) { 6019 const AsmRewrite &AR = *it; 6020 // Check if this has already been covered by another rewrite... 6021 if (AR.Done) 6022 continue; 6023 AsmRewriteKind Kind = AR.Kind; 6024 6025 const char *Loc = AR.Loc.getPointer(); 6026 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!"); 6027 6028 // Emit everything up to the immediate/expression. 6029 if (unsigned Len = Loc - AsmStart) 6030 OS << StringRef(AsmStart, Len); 6031 6032 // Skip the original expression. 6033 if (Kind == AOK_Skip) { 6034 AsmStart = Loc + AR.Len; 6035 continue; 6036 } 6037 6038 unsigned AdditionalSkip = 0; 6039 // Rewrite expressions in $N notation. 6040 switch (Kind) { 6041 default: 6042 break; 6043 case AOK_IntelExpr: 6044 assert(AR.IntelExp.isValid() && "cannot write invalid intel expression"); 6045 if (AR.IntelExp.NeedBracs) 6046 OS << "["; 6047 if (AR.IntelExp.hasBaseReg()) 6048 OS << AR.IntelExp.BaseReg; 6049 if (AR.IntelExp.hasIndexReg()) 6050 OS << (AR.IntelExp.hasBaseReg() ? " + " : "") 6051 << AR.IntelExp.IndexReg; 6052 if (AR.IntelExp.Scale > 1) 6053 OS << " * $$" << AR.IntelExp.Scale; 6054 if (AR.IntelExp.hasOffset()) { 6055 if (AR.IntelExp.hasRegs()) 6056 OS << " + "; 6057 // Fuse this rewrite with a rewrite of the offset name, if present. 6058 StringRef OffsetName = AR.IntelExp.OffsetName; 6059 SMLoc OffsetLoc = SMLoc::getFromPointer(AR.IntelExp.OffsetName.data()); 6060 size_t OffsetLen = OffsetName.size(); 6061 auto rewrite_it = std::find_if( 6062 it, AsmStrRewrites.end(), [&](const AsmRewrite &FusingAR) { 6063 return FusingAR.Loc == OffsetLoc && FusingAR.Len == OffsetLen && 6064 (FusingAR.Kind == AOK_Input || 6065 FusingAR.Kind == AOK_CallInput); 6066 }); 6067 if (rewrite_it == AsmStrRewrites.end()) { 6068 OS << "offset " << OffsetName; 6069 } else if (rewrite_it->Kind == AOK_CallInput) { 6070 OS << "${" << InputIdx++ << ":P}"; 6071 rewrite_it->Done = true; 6072 } else { 6073 OS << '$' << InputIdx++; 6074 rewrite_it->Done = true; 6075 } 6076 } 6077 if (AR.IntelExp.Imm || AR.IntelExp.emitImm()) 6078 OS << (AR.IntelExp.emitImm() ? "$$" : " + $$") << AR.IntelExp.Imm; 6079 if (AR.IntelExp.NeedBracs) 6080 OS << "]"; 6081 break; 6082 case AOK_Label: 6083 OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label; 6084 break; 6085 case AOK_Input: 6086 OS << '$' << InputIdx++; 6087 break; 6088 case AOK_CallInput: 6089 OS << "${" << InputIdx++ << ":P}"; 6090 break; 6091 case AOK_Output: 6092 OS << '$' << OutputIdx++; 6093 break; 6094 case AOK_SizeDirective: 6095 switch (AR.Val) { 6096 default: break; 6097 case 8: OS << "byte ptr "; break; 6098 case 16: OS << "word ptr "; break; 6099 case 32: OS << "dword ptr "; break; 6100 case 64: OS << "qword ptr "; break; 6101 case 80: OS << "xword ptr "; break; 6102 case 128: OS << "xmmword ptr "; break; 6103 case 256: OS << "ymmword ptr "; break; 6104 } 6105 break; 6106 case AOK_Emit: 6107 OS << ".byte"; 6108 break; 6109 case AOK_Align: { 6110 // MS alignment directives are measured in bytes. If the native assembler 6111 // measures alignment in bytes, we can pass it straight through. 6112 OS << ".align"; 6113 if (getContext().getAsmInfo()->getAlignmentIsInBytes()) 6114 break; 6115 6116 // Alignment is in log2 form, so print that instead and skip the original 6117 // immediate. 6118 unsigned Val = AR.Val; 6119 OS << ' ' << Val; 6120 assert(Val < 10 && "Expected alignment less then 2^10."); 6121 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4; 6122 break; 6123 } 6124 case AOK_EVEN: 6125 OS << ".even"; 6126 break; 6127 case AOK_EndOfStatement: 6128 OS << "\n\t"; 6129 break; 6130 } 6131 6132 // Skip the original expression. 6133 AsmStart = Loc + AR.Len + AdditionalSkip; 6134 } 6135 6136 // Emit the remainder of the asm string. 6137 if (AsmStart != AsmEnd) 6138 OS << StringRef(AsmStart, AsmEnd - AsmStart); 6139 6140 AsmString = OS.str(); 6141 return false; 6142 } 6143 6144 namespace llvm { 6145 namespace MCParserUtils { 6146 6147 /// Returns whether the given symbol is used anywhere in the given expression, 6148 /// or subexpressions. 6149 static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) { 6150 switch (Value->getKind()) { 6151 case MCExpr::Binary: { 6152 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value); 6153 return isSymbolUsedInExpression(Sym, BE->getLHS()) || 6154 isSymbolUsedInExpression(Sym, BE->getRHS()); 6155 } 6156 case MCExpr::Target: 6157 case MCExpr::Constant: 6158 return false; 6159 case MCExpr::SymbolRef: { 6160 const MCSymbol &S = 6161 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol(); 6162 if (S.isVariable()) 6163 return isSymbolUsedInExpression(Sym, S.getVariableValue()); 6164 return &S == Sym; 6165 } 6166 case MCExpr::Unary: 6167 return isSymbolUsedInExpression( 6168 Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr()); 6169 } 6170 6171 llvm_unreachable("Unknown expr kind!"); 6172 } 6173 6174 bool parseAssignmentExpression(StringRef Name, bool allow_redef, 6175 MCAsmParser &Parser, MCSymbol *&Sym, 6176 const MCExpr *&Value) { 6177 6178 // FIXME: Use better location, we should use proper tokens. 6179 SMLoc EqualLoc = Parser.getTok().getLoc(); 6180 if (Parser.parseExpression(Value)) 6181 return Parser.TokError("missing expression"); 6182 6183 // Note: we don't count b as used in "a = b". This is to allow 6184 // a = b 6185 // b = c 6186 6187 if (Parser.parseToken(AsmToken::EndOfStatement)) 6188 return true; 6189 6190 // Validate that the LHS is allowed to be a variable (either it has not been 6191 // used as a symbol, or it is an absolute symbol). 6192 Sym = Parser.getContext().lookupSymbol(Name); 6193 if (Sym) { 6194 // Diagnose assignment to a label. 6195 // 6196 // FIXME: Diagnostics. Note the location of the definition as a label. 6197 // FIXME: Diagnose assignment to protected identifier (e.g., register name). 6198 if (isSymbolUsedInExpression(Sym, Value)) 6199 return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'"); 6200 else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() && 6201 !Sym->isVariable()) 6202 ; // Allow redefinitions of undefined symbols only used in directives. 6203 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef) 6204 ; // Allow redefinitions of variables that haven't yet been used. 6205 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef)) 6206 return Parser.Error(EqualLoc, "redefinition of '" + Name + "'"); 6207 else if (!Sym->isVariable()) 6208 return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'"); 6209 else if (!isa<MCConstantExpr>(Sym->getVariableValue())) 6210 return Parser.Error(EqualLoc, 6211 "invalid reassignment of non-absolute variable '" + 6212 Name + "'"); 6213 } else if (Name == ".") { 6214 Parser.getStreamer().emitValueToOffset(Value, 0, EqualLoc); 6215 return false; 6216 } else 6217 Sym = Parser.getContext().getOrCreateSymbol(Name); 6218 6219 Sym->setRedefinable(allow_redef); 6220 6221 return false; 6222 } 6223 6224 } // end namespace MCParserUtils 6225 } // end namespace llvm 6226 6227 /// Create an MCAsmParser instance. 6228 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C, 6229 MCStreamer &Out, const MCAsmInfo &MAI, 6230 unsigned CB) { 6231 return new AsmParser(SM, C, Out, MAI, CB); 6232 } 6233