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/STLExtras.h" 17 #include "llvm/ADT/SmallSet.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/MCParser/AsmCond.h" 36 #include "llvm/MC/MCParser/AsmLexer.h" 37 #include "llvm/MC/MCParser/MCAsmLexer.h" 38 #include "llvm/MC/MCParser/MCAsmParser.h" 39 #include "llvm/MC/MCParser/MCAsmParserExtension.h" 40 #include "llvm/MC/MCParser/MCAsmParserUtils.h" 41 #include "llvm/MC/MCParser/MCParsedAsmOperand.h" 42 #include "llvm/MC/MCParser/MCTargetAsmParser.h" 43 #include "llvm/MC/MCRegisterInfo.h" 44 #include "llvm/MC/MCSection.h" 45 #include "llvm/MC/MCStreamer.h" 46 #include "llvm/MC/MCSymbol.h" 47 #include "llvm/MC/MCSymbolMachO.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 <optional> 68 #include <sstream> 69 #include <string> 70 #include <tuple> 71 #include <utility> 72 #include <vector> 73 74 using namespace llvm; 75 76 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() = default; 77 78 namespace { 79 80 /// Helper types for tracking macro definitions. 81 typedef std::vector<AsmToken> MCAsmMacroArgument; 82 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments; 83 84 /// Helper class for storing information about an active macro 85 /// instantiation. 86 struct MacroInstantiation { 87 /// The location of the instantiation. 88 SMLoc InstantiationLoc; 89 90 /// The buffer where parsing should resume upon instantiation completion. 91 unsigned ExitBuffer; 92 93 /// The location where parsing should resume upon instantiation completion. 94 SMLoc ExitLoc; 95 96 /// The depth of TheCondStack at the start of the instantiation. 97 size_t CondStackDepth; 98 }; 99 100 struct ParseStatementInfo { 101 /// The parsed operands from the last parsed statement. 102 SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands; 103 104 /// The opcode from the last parsed instruction. 105 unsigned Opcode = ~0U; 106 107 /// Was there an error parsing the inline assembly? 108 bool ParseError = false; 109 110 SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr; 111 112 ParseStatementInfo() = delete; 113 ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites) 114 : AsmRewrites(rewrites) {} 115 }; 116 117 /// The concrete assembly parser instance. 118 class AsmParser : public MCAsmParser { 119 private: 120 AsmLexer Lexer; 121 MCContext &Ctx; 122 MCStreamer &Out; 123 const MCAsmInfo &MAI; 124 SourceMgr &SrcMgr; 125 SourceMgr::DiagHandlerTy SavedDiagHandler; 126 void *SavedDiagContext; 127 std::unique_ptr<MCAsmParserExtension> PlatformParser; 128 SMLoc StartTokLoc; 129 std::optional<SMLoc> CFIStartProcLoc; 130 131 /// This is the current buffer index we're lexing from as managed by the 132 /// SourceMgr object. 133 unsigned CurBuffer; 134 135 AsmCond TheCondState; 136 std::vector<AsmCond> TheCondStack; 137 138 /// maps directive names to handler methods in parser 139 /// extensions. Extensions register themselves in this map by calling 140 /// addDirectiveHandler. 141 StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap; 142 143 /// Stack of active macro instantiations. 144 std::vector<MacroInstantiation*> ActiveMacros; 145 146 /// List of bodies of anonymous macros. 147 std::deque<MCAsmMacro> MacroLikeBodies; 148 149 /// Boolean tracking whether macro substitution is enabled. 150 unsigned MacrosEnabledFlag : 1; 151 152 /// Keeps track of how many .macro's have been instantiated. 153 unsigned NumOfMacroInstantiations; 154 155 /// The values from the last parsed cpp hash file line comment if any. 156 struct CppHashInfoTy { 157 StringRef Filename; 158 int64_t LineNumber; 159 SMLoc Loc; 160 unsigned Buf; 161 CppHashInfoTy() : LineNumber(0), Buf(0) {} 162 }; 163 CppHashInfoTy CppHashInfo; 164 165 /// Have we seen any file line comment. 166 bool HadCppHashFilename = false; 167 168 /// List of forward directional labels for diagnosis at the end. 169 SmallVector<std::tuple<SMLoc, CppHashInfoTy, MCSymbol *>, 4> DirLabels; 170 171 SmallSet<StringRef, 2> LTODiscardSymbols; 172 173 /// AssemblerDialect. ~OU means unset value and use value provided by MAI. 174 unsigned AssemblerDialect = ~0U; 175 176 /// is Darwin compatibility enabled? 177 bool IsDarwin = false; 178 179 /// Are we parsing ms-style inline assembly? 180 bool ParsingMSInlineAsm = false; 181 182 /// Did we already inform the user about inconsistent MD5 usage? 183 bool ReportedInconsistentMD5 = false; 184 185 // Is alt macro mode enabled. 186 bool AltMacroMode = false; 187 188 protected: 189 virtual bool parseStatement(ParseStatementInfo &Info, 190 MCAsmParserSemaCallback *SI); 191 192 /// This routine uses the target specific ParseInstruction function to 193 /// parse an instruction into Operands, and then call the target specific 194 /// MatchAndEmit function to match and emit the instruction. 195 bool parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info, 196 StringRef IDVal, AsmToken ID, 197 SMLoc IDLoc); 198 199 /// Should we emit DWARF describing this assembler source? (Returns false if 200 /// the source has .file directives, which means we don't want to generate 201 /// info describing the assembler source itself.) 202 bool enabledGenDwarfForAssembly(); 203 204 public: 205 AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 206 const MCAsmInfo &MAI, unsigned CB); 207 AsmParser(const AsmParser &) = delete; 208 AsmParser &operator=(const AsmParser &) = delete; 209 ~AsmParser() override; 210 211 bool Run(bool NoInitialTextSection, bool NoFinalize = false) override; 212 213 void addDirectiveHandler(StringRef Directive, 214 ExtensionDirectiveHandler Handler) override { 215 ExtensionDirectiveMap[Directive] = Handler; 216 } 217 218 void addAliasForDirective(StringRef Directive, StringRef Alias) override { 219 DirectiveKindMap[Directive.lower()] = DirectiveKindMap[Alias.lower()]; 220 } 221 222 /// @name MCAsmParser Interface 223 /// { 224 225 SourceMgr &getSourceManager() override { return SrcMgr; } 226 MCAsmLexer &getLexer() override { return Lexer; } 227 MCContext &getContext() override { return Ctx; } 228 MCStreamer &getStreamer() override { return Out; } 229 230 CodeViewContext &getCVContext() { return Ctx.getCVContext(); } 231 232 unsigned getAssemblerDialect() override { 233 if (AssemblerDialect == ~0U) 234 return MAI.getAssemblerDialect(); 235 else 236 return AssemblerDialect; 237 } 238 void setAssemblerDialect(unsigned i) override { 239 AssemblerDialect = i; 240 } 241 242 void Note(SMLoc L, const Twine &Msg, SMRange Range = std::nullopt) override; 243 bool Warning(SMLoc L, const Twine &Msg, 244 SMRange Range = std::nullopt) override; 245 bool printError(SMLoc L, const Twine &Msg, 246 SMRange Range = std::nullopt) override; 247 248 const AsmToken &Lex() override; 249 250 void setParsingMSInlineAsm(bool V) override { 251 ParsingMSInlineAsm = V; 252 // When parsing MS inline asm, we must lex 0b1101 and 0ABCH as binary and 253 // hex integer literals. 254 Lexer.setLexMasmIntegers(V); 255 } 256 bool isParsingMSInlineAsm() override { return ParsingMSInlineAsm; } 257 258 bool discardLTOSymbol(StringRef Name) const override { 259 return LTODiscardSymbols.contains(Name); 260 } 261 262 bool parseMSInlineAsm(std::string &AsmString, unsigned &NumOutputs, 263 unsigned &NumInputs, 264 SmallVectorImpl<std::pair<void *, bool>> &OpDecls, 265 SmallVectorImpl<std::string> &Constraints, 266 SmallVectorImpl<std::string> &Clobbers, 267 const MCInstrInfo *MII, MCInstPrinter *IP, 268 MCAsmParserSemaCallback &SI) override; 269 270 bool parseExpression(const MCExpr *&Res); 271 bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 272 bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc, 273 AsmTypeInfo *TypeInfo) override; 274 bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override; 275 bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 276 SMLoc &EndLoc) override; 277 bool parseAbsoluteExpression(int64_t &Res) override; 278 279 /// Parse a floating point expression using the float \p Semantics 280 /// and set \p Res to the value. 281 bool parseRealValue(const fltSemantics &Semantics, APInt &Res); 282 283 /// Parse an identifier or string (as a quoted identifier) 284 /// and set \p Res to the identifier contents. 285 bool parseIdentifier(StringRef &Res) override; 286 void eatToEndOfStatement() override; 287 288 bool checkForValidSection() override; 289 290 /// } 291 292 private: 293 bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites); 294 bool parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo = true); 295 296 void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body, 297 ArrayRef<MCAsmMacroParameter> Parameters); 298 bool expandMacro(raw_svector_ostream &OS, MCAsmMacro &Macro, 299 ArrayRef<MCAsmMacroParameter> Parameters, 300 ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable); 301 302 /// Are macros enabled in the parser? 303 bool areMacrosEnabled() {return MacrosEnabledFlag;} 304 305 /// Control a flag in the parser that enables or disables macros. 306 void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;} 307 308 /// Are we inside a macro instantiation? 309 bool isInsideMacroInstantiation() {return !ActiveMacros.empty();} 310 311 /// Handle entry to macro instantiation. 312 /// 313 /// \param M The macro. 314 /// \param NameLoc Instantiation location. 315 bool handleMacroEntry(MCAsmMacro *M, SMLoc NameLoc); 316 317 /// Handle exit from macro instantiation. 318 void handleMacroExit(); 319 320 /// Extract AsmTokens for a macro argument. 321 bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg); 322 323 /// Parse all macro arguments for a given macro. 324 bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A); 325 326 void printMacroInstantiations(); 327 void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg, 328 SMRange Range = std::nullopt) const { 329 ArrayRef<SMRange> Ranges(Range); 330 SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges); 331 } 332 static void DiagHandler(const SMDiagnostic &Diag, void *Context); 333 334 /// Enter the specified file. This returns true on failure. 335 bool enterIncludeFile(const std::string &Filename); 336 337 /// Process the specified file for the .incbin directive. 338 /// This returns true on failure. 339 bool processIncbinFile(const std::string &Filename, int64_t Skip = 0, 340 const MCExpr *Count = nullptr, SMLoc Loc = SMLoc()); 341 342 /// Reset the current lexer position to that given by \p Loc. The 343 /// current token is not set; clients should ensure Lex() is called 344 /// subsequently. 345 /// 346 /// \param InBuffer If not 0, should be the known buffer id that contains the 347 /// location. 348 void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0); 349 350 /// Parse up to the end of statement and a return the contents from the 351 /// current token until the end of the statement; the current token on exit 352 /// will be either the EndOfStatement or EOF. 353 StringRef parseStringToEndOfStatement() override; 354 355 /// Parse until the end of a statement or a comma is encountered, 356 /// return the contents from the current token up to the end or comma. 357 StringRef parseStringToComma(); 358 359 enum class AssignmentKind { 360 Set, 361 Equiv, 362 Equal, 363 LTOSetConditional, 364 }; 365 366 bool parseAssignment(StringRef Name, AssignmentKind Kind); 367 368 unsigned getBinOpPrecedence(AsmToken::TokenKind K, 369 MCBinaryExpr::Opcode &Kind); 370 371 bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc); 372 bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc); 373 bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc); 374 375 bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc); 376 377 bool parseCVFunctionId(int64_t &FunctionId, StringRef DirectiveName); 378 bool parseCVFileId(int64_t &FileId, StringRef DirectiveName); 379 380 // Generic (target and platform independent) directive parsing. 381 enum DirectiveKind { 382 DK_NO_DIRECTIVE, // Placeholder 383 DK_SET, 384 DK_EQU, 385 DK_EQUIV, 386 DK_ASCII, 387 DK_ASCIZ, 388 DK_STRING, 389 DK_BYTE, 390 DK_SHORT, 391 DK_RELOC, 392 DK_VALUE, 393 DK_2BYTE, 394 DK_LONG, 395 DK_INT, 396 DK_4BYTE, 397 DK_QUAD, 398 DK_8BYTE, 399 DK_OCTA, 400 DK_DC, 401 DK_DC_A, 402 DK_DC_B, 403 DK_DC_D, 404 DK_DC_L, 405 DK_DC_S, 406 DK_DC_W, 407 DK_DC_X, 408 DK_DCB, 409 DK_DCB_B, 410 DK_DCB_D, 411 DK_DCB_L, 412 DK_DCB_S, 413 DK_DCB_W, 414 DK_DCB_X, 415 DK_DS, 416 DK_DS_B, 417 DK_DS_D, 418 DK_DS_L, 419 DK_DS_P, 420 DK_DS_S, 421 DK_DS_W, 422 DK_DS_X, 423 DK_SINGLE, 424 DK_FLOAT, 425 DK_DOUBLE, 426 DK_ALIGN, 427 DK_ALIGN32, 428 DK_BALIGN, 429 DK_BALIGNW, 430 DK_BALIGNL, 431 DK_P2ALIGN, 432 DK_P2ALIGNW, 433 DK_P2ALIGNL, 434 DK_ORG, 435 DK_FILL, 436 DK_ENDR, 437 DK_BUNDLE_ALIGN_MODE, 438 DK_BUNDLE_LOCK, 439 DK_BUNDLE_UNLOCK, 440 DK_ZERO, 441 DK_EXTERN, 442 DK_GLOBL, 443 DK_GLOBAL, 444 DK_LAZY_REFERENCE, 445 DK_NO_DEAD_STRIP, 446 DK_SYMBOL_RESOLVER, 447 DK_PRIVATE_EXTERN, 448 DK_REFERENCE, 449 DK_WEAK_DEFINITION, 450 DK_WEAK_REFERENCE, 451 DK_WEAK_DEF_CAN_BE_HIDDEN, 452 DK_COLD, 453 DK_COMM, 454 DK_COMMON, 455 DK_LCOMM, 456 DK_ABORT, 457 DK_INCLUDE, 458 DK_INCBIN, 459 DK_CODE16, 460 DK_CODE16GCC, 461 DK_REPT, 462 DK_IRP, 463 DK_IRPC, 464 DK_IF, 465 DK_IFEQ, 466 DK_IFGE, 467 DK_IFGT, 468 DK_IFLE, 469 DK_IFLT, 470 DK_IFNE, 471 DK_IFB, 472 DK_IFNB, 473 DK_IFC, 474 DK_IFEQS, 475 DK_IFNC, 476 DK_IFNES, 477 DK_IFDEF, 478 DK_IFNDEF, 479 DK_IFNOTDEF, 480 DK_ELSEIF, 481 DK_ELSE, 482 DK_ENDIF, 483 DK_SPACE, 484 DK_SKIP, 485 DK_FILE, 486 DK_LINE, 487 DK_LOC, 488 DK_LOC_LABEL, 489 DK_STABS, 490 DK_CV_FILE, 491 DK_CV_FUNC_ID, 492 DK_CV_INLINE_SITE_ID, 493 DK_CV_LOC, 494 DK_CV_LINETABLE, 495 DK_CV_INLINE_LINETABLE, 496 DK_CV_DEF_RANGE, 497 DK_CV_STRINGTABLE, 498 DK_CV_STRING, 499 DK_CV_FILECHECKSUMS, 500 DK_CV_FILECHECKSUM_OFFSET, 501 DK_CV_FPO_DATA, 502 DK_CFI_SECTIONS, 503 DK_CFI_STARTPROC, 504 DK_CFI_ENDPROC, 505 DK_CFI_DEF_CFA, 506 DK_CFI_DEF_CFA_OFFSET, 507 DK_CFI_ADJUST_CFA_OFFSET, 508 DK_CFI_DEF_CFA_REGISTER, 509 DK_CFI_LLVM_DEF_ASPACE_CFA, 510 DK_CFI_OFFSET, 511 DK_CFI_REL_OFFSET, 512 DK_CFI_PERSONALITY, 513 DK_CFI_LSDA, 514 DK_CFI_REMEMBER_STATE, 515 DK_CFI_RESTORE_STATE, 516 DK_CFI_SAME_VALUE, 517 DK_CFI_RESTORE, 518 DK_CFI_ESCAPE, 519 DK_CFI_RETURN_COLUMN, 520 DK_CFI_SIGNAL_FRAME, 521 DK_CFI_UNDEFINED, 522 DK_CFI_REGISTER, 523 DK_CFI_WINDOW_SAVE, 524 DK_CFI_LABEL, 525 DK_CFI_B_KEY_FRAME, 526 DK_CFI_VAL_OFFSET, 527 DK_MACROS_ON, 528 DK_MACROS_OFF, 529 DK_ALTMACRO, 530 DK_NOALTMACRO, 531 DK_MACRO, 532 DK_EXITM, 533 DK_ENDM, 534 DK_ENDMACRO, 535 DK_PURGEM, 536 DK_SLEB128, 537 DK_ULEB128, 538 DK_ERR, 539 DK_ERROR, 540 DK_WARNING, 541 DK_PRINT, 542 DK_ADDRSIG, 543 DK_ADDRSIG_SYM, 544 DK_PSEUDO_PROBE, 545 DK_LTO_DISCARD, 546 DK_LTO_SET_CONDITIONAL, 547 DK_CFI_MTE_TAGGED_FRAME, 548 DK_MEMTAG, 549 DK_END 550 }; 551 552 /// Maps directive name --> DirectiveKind enum, for 553 /// directives parsed by this class. 554 StringMap<DirectiveKind> DirectiveKindMap; 555 556 // Codeview def_range type parsing. 557 enum CVDefRangeType { 558 CVDR_DEFRANGE = 0, // Placeholder 559 CVDR_DEFRANGE_REGISTER, 560 CVDR_DEFRANGE_FRAMEPOINTER_REL, 561 CVDR_DEFRANGE_SUBFIELD_REGISTER, 562 CVDR_DEFRANGE_REGISTER_REL 563 }; 564 565 /// Maps Codeview def_range types --> CVDefRangeType enum, for 566 /// Codeview def_range types parsed by this class. 567 StringMap<CVDefRangeType> CVDefRangeTypeMap; 568 569 // ".ascii", ".asciz", ".string" 570 bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated); 571 bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc" 572 bool parseDirectiveValue(StringRef IDVal, 573 unsigned Size); // ".byte", ".long", ... 574 bool parseDirectiveOctaValue(StringRef IDVal); // ".octa", ... 575 bool parseDirectiveRealValue(StringRef IDVal, 576 const fltSemantics &); // ".single", ... 577 bool parseDirectiveFill(); // ".fill" 578 bool parseDirectiveZero(); // ".zero" 579 // ".set", ".equ", ".equiv", ".lto_set_conditional" 580 bool parseDirectiveSet(StringRef IDVal, AssignmentKind Kind); 581 bool parseDirectiveOrg(); // ".org" 582 // ".align{,32}", ".p2align{,w,l}" 583 bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize); 584 585 // ".file", ".line", ".loc", ".loc_label", ".stabs" 586 bool parseDirectiveFile(SMLoc DirectiveLoc); 587 bool parseDirectiveLine(); 588 bool parseDirectiveLoc(); 589 bool parseDirectiveLocLabel(SMLoc DirectiveLoc); 590 bool parseDirectiveStabs(); 591 592 // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable", 593 // ".cv_inline_linetable", ".cv_def_range", ".cv_string" 594 bool parseDirectiveCVFile(); 595 bool parseDirectiveCVFuncId(); 596 bool parseDirectiveCVInlineSiteId(); 597 bool parseDirectiveCVLoc(); 598 bool parseDirectiveCVLinetable(); 599 bool parseDirectiveCVInlineLinetable(); 600 bool parseDirectiveCVDefRange(); 601 bool parseDirectiveCVString(); 602 bool parseDirectiveCVStringTable(); 603 bool parseDirectiveCVFileChecksums(); 604 bool parseDirectiveCVFileChecksumOffset(); 605 bool parseDirectiveCVFPOData(); 606 607 // .cfi directives 608 bool parseDirectiveCFIRegister(SMLoc DirectiveLoc); 609 bool parseDirectiveCFIWindowSave(SMLoc DirectiveLoc); 610 bool parseDirectiveCFISections(); 611 bool parseDirectiveCFIStartProc(); 612 bool parseDirectiveCFIEndProc(); 613 bool parseDirectiveCFIDefCfaOffset(SMLoc DirectiveLoc); 614 bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc); 615 bool parseDirectiveCFIAdjustCfaOffset(SMLoc DirectiveLoc); 616 bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc); 617 bool parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc); 618 bool parseDirectiveCFIOffset(SMLoc DirectiveLoc); 619 bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc); 620 bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality); 621 bool parseDirectiveCFIRememberState(SMLoc DirectiveLoc); 622 bool parseDirectiveCFIRestoreState(SMLoc DirectiveLoc); 623 bool parseDirectiveCFISameValue(SMLoc DirectiveLoc); 624 bool parseDirectiveCFIRestore(SMLoc DirectiveLoc); 625 bool parseDirectiveCFIEscape(SMLoc DirectiveLoc); 626 bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc); 627 bool parseDirectiveCFISignalFrame(SMLoc DirectiveLoc); 628 bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc); 629 bool parseDirectiveCFILabel(SMLoc DirectiveLoc); 630 bool parseDirectiveCFIValOffset(SMLoc DirectiveLoc); 631 632 // macro directives 633 bool parseDirectivePurgeMacro(SMLoc DirectiveLoc); 634 bool parseDirectiveExitMacro(StringRef Directive); 635 bool parseDirectiveEndMacro(StringRef Directive); 636 bool parseDirectiveMacro(SMLoc DirectiveLoc); 637 bool parseDirectiveMacrosOnOff(StringRef Directive); 638 // alternate macro mode directives 639 bool parseDirectiveAltmacro(StringRef Directive); 640 // ".bundle_align_mode" 641 bool parseDirectiveBundleAlignMode(); 642 // ".bundle_lock" 643 bool parseDirectiveBundleLock(); 644 // ".bundle_unlock" 645 bool parseDirectiveBundleUnlock(); 646 647 // ".space", ".skip" 648 bool parseDirectiveSpace(StringRef IDVal); 649 650 // ".dcb" 651 bool parseDirectiveDCB(StringRef IDVal, unsigned Size); 652 bool parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &); 653 // ".ds" 654 bool parseDirectiveDS(StringRef IDVal, unsigned Size); 655 656 // .sleb128 (Signed=true) and .uleb128 (Signed=false) 657 bool parseDirectiveLEB128(bool Signed); 658 659 /// Parse a directive like ".globl" which 660 /// accepts a single symbol (which should be a label or an external). 661 bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr); 662 663 bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm" 664 665 bool parseDirectiveAbort(SMLoc DirectiveLoc); // ".abort" 666 bool parseDirectiveInclude(); // ".include" 667 bool parseDirectiveIncbin(); // ".incbin" 668 669 // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne" 670 bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind); 671 // ".ifb" or ".ifnb", depending on ExpectBlank. 672 bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank); 673 // ".ifc" or ".ifnc", depending on ExpectEqual. 674 bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual); 675 // ".ifeqs" or ".ifnes", depending on ExpectEqual. 676 bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual); 677 // ".ifdef" or ".ifndef", depending on expect_defined 678 bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined); 679 bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif" 680 bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else" 681 bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif 682 bool parseEscapedString(std::string &Data) override; 683 bool parseAngleBracketString(std::string &Data) override; 684 685 const MCExpr *applyModifierToExpr(const MCExpr *E, 686 MCSymbolRefExpr::VariantKind Variant); 687 688 // Macro-like directives 689 MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc); 690 void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 691 raw_svector_ostream &OS); 692 bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive); 693 bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp" 694 bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc" 695 bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr" 696 697 // "_emit" or "__emit" 698 bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info, 699 size_t Len); 700 701 // "align" 702 bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info); 703 704 // "end" 705 bool parseDirectiveEnd(SMLoc DirectiveLoc); 706 707 // ".err" or ".error" 708 bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage); 709 710 // ".warning" 711 bool parseDirectiveWarning(SMLoc DirectiveLoc); 712 713 // .print <double-quotes-string> 714 bool parseDirectivePrint(SMLoc DirectiveLoc); 715 716 // .pseudoprobe 717 bool parseDirectivePseudoProbe(); 718 719 // ".lto_discard" 720 bool parseDirectiveLTODiscard(); 721 722 // Directives to support address-significance tables. 723 bool parseDirectiveAddrsig(); 724 bool parseDirectiveAddrsigSym(); 725 726 void initializeDirectiveKindMap(); 727 void initializeCVDefRangeTypeMap(); 728 }; 729 730 class HLASMAsmParser final : public AsmParser { 731 private: 732 MCAsmLexer &Lexer; 733 MCStreamer &Out; 734 735 void lexLeadingSpaces() { 736 while (Lexer.is(AsmToken::Space)) 737 Lexer.Lex(); 738 } 739 740 bool parseAsHLASMLabel(ParseStatementInfo &Info, MCAsmParserSemaCallback *SI); 741 bool parseAsMachineInstruction(ParseStatementInfo &Info, 742 MCAsmParserSemaCallback *SI); 743 744 public: 745 HLASMAsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 746 const MCAsmInfo &MAI, unsigned CB = 0) 747 : AsmParser(SM, Ctx, Out, MAI, CB), Lexer(getLexer()), Out(Out) { 748 Lexer.setSkipSpace(false); 749 Lexer.setAllowHashInIdentifier(true); 750 Lexer.setLexHLASMIntegers(true); 751 Lexer.setLexHLASMStrings(true); 752 } 753 754 ~HLASMAsmParser() { Lexer.setSkipSpace(true); } 755 756 bool parseStatement(ParseStatementInfo &Info, 757 MCAsmParserSemaCallback *SI) override; 758 }; 759 760 } // end anonymous namespace 761 762 namespace llvm { 763 764 extern cl::opt<unsigned> AsmMacroMaxNestingDepth; 765 766 extern MCAsmParserExtension *createDarwinAsmParser(); 767 extern MCAsmParserExtension *createELFAsmParser(); 768 extern MCAsmParserExtension *createCOFFAsmParser(); 769 extern MCAsmParserExtension *createGOFFAsmParser(); 770 extern MCAsmParserExtension *createXCOFFAsmParser(); 771 extern MCAsmParserExtension *createWasmAsmParser(); 772 773 } // end namespace llvm 774 775 enum { DEFAULT_ADDRSPACE = 0 }; 776 777 AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out, 778 const MCAsmInfo &MAI, unsigned CB = 0) 779 : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM), 780 CurBuffer(CB ? CB : SM.getMainFileID()), MacrosEnabledFlag(true) { 781 HadError = false; 782 // Save the old handler. 783 SavedDiagHandler = SrcMgr.getDiagHandler(); 784 SavedDiagContext = SrcMgr.getDiagContext(); 785 // Set our own handler which calls the saved handler. 786 SrcMgr.setDiagHandler(DiagHandler, this); 787 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 788 // Make MCStreamer aware of the StartTokLoc for locations in diagnostics. 789 Out.setStartTokLocPtr(&StartTokLoc); 790 791 // Initialize the platform / file format parser. 792 switch (Ctx.getObjectFileType()) { 793 case MCContext::IsCOFF: 794 PlatformParser.reset(createCOFFAsmParser()); 795 break; 796 case MCContext::IsMachO: 797 PlatformParser.reset(createDarwinAsmParser()); 798 IsDarwin = true; 799 break; 800 case MCContext::IsELF: 801 PlatformParser.reset(createELFAsmParser()); 802 break; 803 case MCContext::IsGOFF: 804 PlatformParser.reset(createGOFFAsmParser()); 805 break; 806 case MCContext::IsSPIRV: 807 report_fatal_error( 808 "Need to implement createSPIRVAsmParser for SPIRV format."); 809 break; 810 case MCContext::IsWasm: 811 PlatformParser.reset(createWasmAsmParser()); 812 break; 813 case MCContext::IsXCOFF: 814 PlatformParser.reset(createXCOFFAsmParser()); 815 break; 816 case MCContext::IsDXContainer: 817 report_fatal_error("DXContainer is not supported yet"); 818 break; 819 } 820 821 PlatformParser->Initialize(*this); 822 initializeDirectiveKindMap(); 823 initializeCVDefRangeTypeMap(); 824 825 NumOfMacroInstantiations = 0; 826 } 827 828 AsmParser::~AsmParser() { 829 assert((HadError || ActiveMacros.empty()) && 830 "Unexpected active macro instantiation!"); 831 832 // Remove MCStreamer's reference to the parser SMLoc. 833 Out.setStartTokLocPtr(nullptr); 834 // Restore the saved diagnostics handler and context for use during 835 // finalization. 836 SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext); 837 } 838 839 void AsmParser::printMacroInstantiations() { 840 // Print the active macro instantiation stack. 841 for (MacroInstantiation *M : reverse(ActiveMacros)) 842 printMessage(M->InstantiationLoc, SourceMgr::DK_Note, 843 "while in macro instantiation"); 844 } 845 846 void AsmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) { 847 printPendingErrors(); 848 printMessage(L, SourceMgr::DK_Note, Msg, Range); 849 printMacroInstantiations(); 850 } 851 852 bool AsmParser::Warning(SMLoc L, const Twine &Msg, SMRange Range) { 853 if(getTargetParser().getTargetOptions().MCNoWarn) 854 return false; 855 if (getTargetParser().getTargetOptions().MCFatalWarnings) 856 return Error(L, Msg, Range); 857 printMessage(L, SourceMgr::DK_Warning, Msg, Range); 858 printMacroInstantiations(); 859 return false; 860 } 861 862 bool AsmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) { 863 HadError = true; 864 printMessage(L, SourceMgr::DK_Error, Msg, Range); 865 printMacroInstantiations(); 866 return true; 867 } 868 869 bool AsmParser::enterIncludeFile(const std::string &Filename) { 870 std::string IncludedFile; 871 unsigned NewBuf = 872 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 873 if (!NewBuf) 874 return true; 875 876 CurBuffer = NewBuf; 877 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 878 return false; 879 } 880 881 /// Process the specified .incbin file by searching for it in the include paths 882 /// then just emitting the byte contents of the file to the streamer. This 883 /// returns true on failure. 884 bool AsmParser::processIncbinFile(const std::string &Filename, int64_t Skip, 885 const MCExpr *Count, SMLoc Loc) { 886 std::string IncludedFile; 887 unsigned NewBuf = 888 SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile); 889 if (!NewBuf) 890 return true; 891 892 // Pick up the bytes from the file and emit them. 893 StringRef Bytes = SrcMgr.getMemoryBuffer(NewBuf)->getBuffer(); 894 Bytes = Bytes.drop_front(Skip); 895 if (Count) { 896 int64_t Res; 897 if (!Count->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr())) 898 return Error(Loc, "expected absolute expression"); 899 if (Res < 0) 900 return Warning(Loc, "negative count has no effect"); 901 Bytes = Bytes.take_front(Res); 902 } 903 getStreamer().emitBytes(Bytes); 904 return false; 905 } 906 907 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) { 908 CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc); 909 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(), 910 Loc.getPointer()); 911 } 912 913 const AsmToken &AsmParser::Lex() { 914 if (Lexer.getTok().is(AsmToken::Error)) 915 Error(Lexer.getErrLoc(), Lexer.getErr()); 916 917 // if it's a end of statement with a comment in it 918 if (getTok().is(AsmToken::EndOfStatement)) { 919 // if this is a line comment output it. 920 if (!getTok().getString().empty() && getTok().getString().front() != '\n' && 921 getTok().getString().front() != '\r' && MAI.preserveAsmComments()) 922 Out.addExplicitComment(Twine(getTok().getString())); 923 } 924 925 const AsmToken *tok = &Lexer.Lex(); 926 927 // Parse comments here to be deferred until end of next statement. 928 while (tok->is(AsmToken::Comment)) { 929 if (MAI.preserveAsmComments()) 930 Out.addExplicitComment(Twine(tok->getString())); 931 tok = &Lexer.Lex(); 932 } 933 934 if (tok->is(AsmToken::Eof)) { 935 // If this is the end of an included file, pop the parent file off the 936 // include stack. 937 SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer); 938 if (ParentIncludeLoc != SMLoc()) { 939 jumpToLoc(ParentIncludeLoc); 940 return Lex(); 941 } 942 } 943 944 return *tok; 945 } 946 947 bool AsmParser::enabledGenDwarfForAssembly() { 948 // Check whether the user specified -g. 949 if (!getContext().getGenDwarfForAssembly()) 950 return false; 951 // If we haven't encountered any .file directives (which would imply that 952 // the assembler source was produced with debug info already) then emit one 953 // describing the assembler source file itself. 954 if (getContext().getGenDwarfFileNumber() == 0) { 955 const MCDwarfFile &RootFile = 956 getContext().getMCDwarfLineTable(/*CUID=*/0).getRootFile(); 957 getContext().setGenDwarfFileNumber(getStreamer().emitDwarfFileDirective( 958 /*CUID=*/0, getContext().getCompilationDir(), RootFile.Name, 959 RootFile.Checksum, RootFile.Source)); 960 } 961 return true; 962 } 963 964 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) { 965 LTODiscardSymbols.clear(); 966 967 // Create the initial section, if requested. 968 if (!NoInitialTextSection) 969 Out.initSections(false, getTargetParser().getSTI()); 970 971 // Prime the lexer. 972 Lex(); 973 974 HadError = false; 975 AsmCond StartingCondState = TheCondState; 976 SmallVector<AsmRewrite, 4> AsmStrRewrites; 977 978 // If we are generating dwarf for assembly source files save the initial text 979 // section. (Don't use enabledGenDwarfForAssembly() here, as we aren't 980 // emitting any actual debug info yet and haven't had a chance to parse any 981 // embedded .file directives.) 982 if (getContext().getGenDwarfForAssembly()) { 983 MCSection *Sec = getStreamer().getCurrentSectionOnly(); 984 if (!Sec->getBeginSymbol()) { 985 MCSymbol *SectionStartSym = getContext().createTempSymbol(); 986 getStreamer().emitLabel(SectionStartSym); 987 Sec->setBeginSymbol(SectionStartSym); 988 } 989 bool InsertResult = getContext().addGenDwarfSection(Sec); 990 assert(InsertResult && ".text section should not have debug info yet"); 991 (void)InsertResult; 992 } 993 994 getTargetParser().onBeginOfFile(); 995 996 // While we have input, parse each statement. 997 while (Lexer.isNot(AsmToken::Eof)) { 998 ParseStatementInfo Info(&AsmStrRewrites); 999 bool Parsed = parseStatement(Info, nullptr); 1000 1001 // If we have a Lexer Error we are on an Error Token. Load in Lexer Error 1002 // for printing ErrMsg via Lex() only if no (presumably better) parser error 1003 // exists. 1004 if (Parsed && !hasPendingError() && Lexer.getTok().is(AsmToken::Error)) { 1005 Lex(); 1006 } 1007 1008 // parseStatement returned true so may need to emit an error. 1009 printPendingErrors(); 1010 1011 // Skipping to the next line if needed. 1012 if (Parsed && !getLexer().isAtStartOfStatement()) 1013 eatToEndOfStatement(); 1014 } 1015 1016 getTargetParser().onEndOfFile(); 1017 printPendingErrors(); 1018 1019 // All errors should have been emitted. 1020 assert(!hasPendingError() && "unexpected error from parseStatement"); 1021 1022 getTargetParser().flushPendingInstructions(getStreamer()); 1023 1024 if (TheCondState.TheCond != StartingCondState.TheCond || 1025 TheCondState.Ignore != StartingCondState.Ignore) 1026 printError(getTok().getLoc(), "unmatched .ifs or .elses"); 1027 // Check to see there are no empty DwarfFile slots. 1028 const auto &LineTables = getContext().getMCDwarfLineTables(); 1029 if (!LineTables.empty()) { 1030 unsigned Index = 0; 1031 for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) { 1032 if (File.Name.empty() && Index != 0) 1033 printError(getTok().getLoc(), "unassigned file number: " + 1034 Twine(Index) + 1035 " for .file directives"); 1036 ++Index; 1037 } 1038 } 1039 1040 // Check to see that all assembler local symbols were actually defined. 1041 // Targets that don't do subsections via symbols may not want this, though, 1042 // so conservatively exclude them. Only do this if we're finalizing, though, 1043 // as otherwise we won't necessarily have seen everything yet. 1044 if (!NoFinalize) { 1045 if (MAI.hasSubsectionsViaSymbols()) { 1046 for (const auto &TableEntry : getContext().getSymbols()) { 1047 MCSymbol *Sym = TableEntry.getValue().Symbol; 1048 // Variable symbols may not be marked as defined, so check those 1049 // explicitly. If we know it's a variable, we have a definition for 1050 // the purposes of this check. 1051 if (Sym && Sym->isTemporary() && !Sym->isVariable() && 1052 !Sym->isDefined()) 1053 // FIXME: We would really like to refer back to where the symbol was 1054 // first referenced for a source location. We need to add something 1055 // to track that. Currently, we just point to the end of the file. 1056 printError(getTok().getLoc(), "assembler local symbol '" + 1057 Sym->getName() + "' not defined"); 1058 } 1059 } 1060 1061 // Temporary symbols like the ones for directional jumps don't go in the 1062 // symbol table. They also need to be diagnosed in all (final) cases. 1063 for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) { 1064 if (std::get<2>(LocSym)->isUndefined()) { 1065 // Reset the state of any "# line file" directives we've seen to the 1066 // context as it was at the diagnostic site. 1067 CppHashInfo = std::get<1>(LocSym); 1068 printError(std::get<0>(LocSym), "directional label undefined"); 1069 } 1070 } 1071 } 1072 // Finalize the output stream if there are no errors and if the client wants 1073 // us to. 1074 if (!HadError && !NoFinalize) { 1075 if (auto *TS = Out.getTargetStreamer()) 1076 TS->emitConstantPools(); 1077 1078 Out.finish(Lexer.getLoc()); 1079 } 1080 1081 return HadError || getContext().hadError(); 1082 } 1083 1084 bool AsmParser::checkForValidSection() { 1085 if (!ParsingMSInlineAsm && !getStreamer().getCurrentFragment()) { 1086 Out.initSections(false, getTargetParser().getSTI()); 1087 return Error(getTok().getLoc(), 1088 "expected section directive before assembly directive"); 1089 } 1090 return false; 1091 } 1092 1093 /// Throw away the rest of the line for testing purposes. 1094 void AsmParser::eatToEndOfStatement() { 1095 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 1096 Lexer.Lex(); 1097 1098 // Eat EOL. 1099 if (Lexer.is(AsmToken::EndOfStatement)) 1100 Lexer.Lex(); 1101 } 1102 1103 StringRef AsmParser::parseStringToEndOfStatement() { 1104 const char *Start = getTok().getLoc().getPointer(); 1105 1106 while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof)) 1107 Lexer.Lex(); 1108 1109 const char *End = getTok().getLoc().getPointer(); 1110 return StringRef(Start, End - Start); 1111 } 1112 1113 StringRef AsmParser::parseStringToComma() { 1114 const char *Start = getTok().getLoc().getPointer(); 1115 1116 while (Lexer.isNot(AsmToken::EndOfStatement) && 1117 Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof)) 1118 Lexer.Lex(); 1119 1120 const char *End = getTok().getLoc().getPointer(); 1121 return StringRef(Start, End - Start); 1122 } 1123 1124 /// Parse a paren expression and return it. 1125 /// NOTE: This assumes the leading '(' has already been consumed. 1126 /// 1127 /// parenexpr ::= expr) 1128 /// 1129 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) { 1130 if (parseExpression(Res)) 1131 return true; 1132 EndLoc = Lexer.getTok().getEndLoc(); 1133 return parseRParen(); 1134 } 1135 1136 /// Parse a bracket expression and return it. 1137 /// NOTE: This assumes the leading '[' has already been consumed. 1138 /// 1139 /// bracketexpr ::= expr] 1140 /// 1141 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) { 1142 if (parseExpression(Res)) 1143 return true; 1144 EndLoc = getTok().getEndLoc(); 1145 if (parseToken(AsmToken::RBrac, "expected ']' in brackets expression")) 1146 return true; 1147 return false; 1148 } 1149 1150 /// Parse a primary expression and return it. 1151 /// primaryexpr ::= (parenexpr 1152 /// primaryexpr ::= symbol 1153 /// primaryexpr ::= number 1154 /// primaryexpr ::= '.' 1155 /// primaryexpr ::= ~,+,- primaryexpr 1156 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc, 1157 AsmTypeInfo *TypeInfo) { 1158 SMLoc FirstTokenLoc = getLexer().getLoc(); 1159 AsmToken::TokenKind FirstTokenKind = Lexer.getKind(); 1160 switch (FirstTokenKind) { 1161 default: 1162 return TokError("unknown token in expression"); 1163 // If we have an error assume that we've already handled it. 1164 case AsmToken::Error: 1165 return true; 1166 case AsmToken::Exclaim: 1167 Lex(); // Eat the operator. 1168 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1169 return true; 1170 Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc); 1171 return false; 1172 case AsmToken::Dollar: 1173 case AsmToken::Star: 1174 case AsmToken::At: 1175 case AsmToken::String: 1176 case AsmToken::Identifier: { 1177 StringRef Identifier; 1178 if (parseIdentifier(Identifier)) { 1179 // We may have failed but '$'|'*' may be a valid token in context of 1180 // the current PC. 1181 if (getTok().is(AsmToken::Dollar) || getTok().is(AsmToken::Star)) { 1182 bool ShouldGenerateTempSymbol = false; 1183 if ((getTok().is(AsmToken::Dollar) && MAI.getDollarIsPC()) || 1184 (getTok().is(AsmToken::Star) && MAI.isHLASM())) 1185 ShouldGenerateTempSymbol = true; 1186 1187 if (!ShouldGenerateTempSymbol) 1188 return Error(FirstTokenLoc, "invalid token in expression"); 1189 1190 // Eat the '$'|'*' token. 1191 Lex(); 1192 // This is either a '$'|'*' reference, which references the current PC. 1193 // Emit a temporary label to the streamer and refer to it. 1194 MCSymbol *Sym = Ctx.createTempSymbol(); 1195 Out.emitLabel(Sym); 1196 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, 1197 getContext()); 1198 EndLoc = FirstTokenLoc; 1199 return false; 1200 } 1201 } 1202 // Parse symbol variant 1203 std::pair<StringRef, StringRef> Split; 1204 if (!MAI.useParensForSymbolVariant()) { 1205 if (FirstTokenKind == AsmToken::String) { 1206 if (Lexer.is(AsmToken::At)) { 1207 Lex(); // eat @ 1208 SMLoc AtLoc = getLexer().getLoc(); 1209 StringRef VName; 1210 if (parseIdentifier(VName)) 1211 return Error(AtLoc, "expected symbol variant after '@'"); 1212 1213 Split = std::make_pair(Identifier, VName); 1214 } 1215 } else { 1216 Split = Identifier.split('@'); 1217 } 1218 } else if (Lexer.is(AsmToken::LParen)) { 1219 Lex(); // eat '('. 1220 StringRef VName; 1221 parseIdentifier(VName); 1222 if (parseRParen()) 1223 return true; 1224 Split = std::make_pair(Identifier, VName); 1225 } 1226 1227 EndLoc = SMLoc::getFromPointer(Identifier.end()); 1228 1229 // This is a symbol reference. 1230 StringRef SymbolName = Identifier; 1231 if (SymbolName.empty()) 1232 return Error(getLexer().getLoc(), "expected a symbol reference"); 1233 1234 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 1235 1236 // Lookup the symbol variant if used. 1237 if (!Split.second.empty()) { 1238 Variant = getTargetParser().getVariantKindForName(Split.second); 1239 if (Variant != MCSymbolRefExpr::VK_Invalid) { 1240 SymbolName = Split.first; 1241 } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) { 1242 Variant = MCSymbolRefExpr::VK_None; 1243 } else { 1244 return Error(SMLoc::getFromPointer(Split.second.begin()), 1245 "invalid variant '" + Split.second + "'"); 1246 } 1247 } 1248 1249 MCSymbol *Sym = getContext().getInlineAsmLabel(SymbolName); 1250 if (!Sym) 1251 Sym = getContext().getOrCreateSymbol(MAI.isHLASM() ? SymbolName.upper() 1252 : SymbolName); 1253 1254 // If this is an absolute variable reference, substitute it now to preserve 1255 // semantics in the face of reassignment. 1256 if (Sym->isVariable()) { 1257 auto V = Sym->getVariableValue(/*SetUsed*/ false); 1258 bool DoInline = isa<MCConstantExpr>(V) && !Variant; 1259 if (auto TV = dyn_cast<MCTargetExpr>(V)) 1260 DoInline = TV->inlineAssignedExpr(); 1261 if (DoInline) { 1262 if (Variant) 1263 return Error(EndLoc, "unexpected modifier on variable reference"); 1264 Res = Sym->getVariableValue(/*SetUsed*/ false); 1265 return false; 1266 } 1267 } 1268 1269 // Otherwise create a symbol ref. 1270 Res = MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc); 1271 return false; 1272 } 1273 case AsmToken::BigNum: 1274 return TokError("literal value out of range for directive"); 1275 case AsmToken::Integer: { 1276 SMLoc Loc = getTok().getLoc(); 1277 int64_t IntVal = getTok().getIntVal(); 1278 Res = MCConstantExpr::create(IntVal, getContext()); 1279 EndLoc = Lexer.getTok().getEndLoc(); 1280 Lex(); // Eat token. 1281 // Look for 'b' or 'f' following an Integer as a directional label 1282 if (Lexer.getKind() == AsmToken::Identifier) { 1283 StringRef IDVal = getTok().getString(); 1284 // Lookup the symbol variant if used. 1285 std::pair<StringRef, StringRef> Split = IDVal.split('@'); 1286 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None; 1287 if (Split.first.size() != IDVal.size()) { 1288 Variant = MCSymbolRefExpr::getVariantKindForName(Split.second); 1289 if (Variant == MCSymbolRefExpr::VK_Invalid) 1290 return TokError("invalid variant '" + Split.second + "'"); 1291 IDVal = Split.first; 1292 } 1293 if (IDVal == "f" || IDVal == "b") { 1294 MCSymbol *Sym = 1295 Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b"); 1296 Res = MCSymbolRefExpr::create(Sym, Variant, getContext()); 1297 if (IDVal == "b" && Sym->isUndefined()) 1298 return Error(Loc, "directional label undefined"); 1299 DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym)); 1300 EndLoc = Lexer.getTok().getEndLoc(); 1301 Lex(); // Eat identifier. 1302 } 1303 } 1304 return false; 1305 } 1306 case AsmToken::Real: { 1307 APFloat RealVal(APFloat::IEEEdouble(), getTok().getString()); 1308 uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue(); 1309 Res = MCConstantExpr::create(IntVal, getContext()); 1310 EndLoc = Lexer.getTok().getEndLoc(); 1311 Lex(); // Eat token. 1312 return false; 1313 } 1314 case AsmToken::Dot: { 1315 if (MAI.isHLASM()) 1316 return TokError("cannot use . as current PC"); 1317 1318 // This is a '.' reference, which references the current PC. Emit a 1319 // temporary label to the streamer and refer to it. 1320 MCSymbol *Sym = Ctx.createTempSymbol(); 1321 Out.emitLabel(Sym); 1322 Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext()); 1323 EndLoc = Lexer.getTok().getEndLoc(); 1324 Lex(); // Eat identifier. 1325 return false; 1326 } 1327 case AsmToken::LParen: 1328 Lex(); // Eat the '('. 1329 return parseParenExpr(Res, EndLoc); 1330 case AsmToken::LBrac: 1331 if (!PlatformParser->HasBracketExpressions()) 1332 return TokError("brackets expression not supported on this target"); 1333 Lex(); // Eat the '['. 1334 return parseBracketExpr(Res, EndLoc); 1335 case AsmToken::Minus: 1336 Lex(); // Eat the operator. 1337 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1338 return true; 1339 Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc); 1340 return false; 1341 case AsmToken::Plus: 1342 Lex(); // Eat the operator. 1343 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1344 return true; 1345 Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc); 1346 return false; 1347 case AsmToken::Tilde: 1348 Lex(); // Eat the operator. 1349 if (parsePrimaryExpr(Res, EndLoc, TypeInfo)) 1350 return true; 1351 Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc); 1352 return false; 1353 // MIPS unary expression operators. The lexer won't generate these tokens if 1354 // MCAsmInfo::HasMipsExpressions is false for the target. 1355 case AsmToken::PercentCall16: 1356 case AsmToken::PercentCall_Hi: 1357 case AsmToken::PercentCall_Lo: 1358 case AsmToken::PercentDtprel_Hi: 1359 case AsmToken::PercentDtprel_Lo: 1360 case AsmToken::PercentGot: 1361 case AsmToken::PercentGot_Disp: 1362 case AsmToken::PercentGot_Hi: 1363 case AsmToken::PercentGot_Lo: 1364 case AsmToken::PercentGot_Ofst: 1365 case AsmToken::PercentGot_Page: 1366 case AsmToken::PercentGottprel: 1367 case AsmToken::PercentGp_Rel: 1368 case AsmToken::PercentHi: 1369 case AsmToken::PercentHigher: 1370 case AsmToken::PercentHighest: 1371 case AsmToken::PercentLo: 1372 case AsmToken::PercentNeg: 1373 case AsmToken::PercentPcrel_Hi: 1374 case AsmToken::PercentPcrel_Lo: 1375 case AsmToken::PercentTlsgd: 1376 case AsmToken::PercentTlsldm: 1377 case AsmToken::PercentTprel_Hi: 1378 case AsmToken::PercentTprel_Lo: 1379 Lex(); // Eat the operator. 1380 if (Lexer.isNot(AsmToken::LParen)) 1381 return TokError("expected '(' after operator"); 1382 Lex(); // Eat the operator. 1383 if (parseExpression(Res, EndLoc)) 1384 return true; 1385 if (parseRParen()) 1386 return true; 1387 Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx); 1388 return !Res; 1389 } 1390 } 1391 1392 bool AsmParser::parseExpression(const MCExpr *&Res) { 1393 SMLoc EndLoc; 1394 return parseExpression(Res, EndLoc); 1395 } 1396 1397 const MCExpr * 1398 AsmParser::applyModifierToExpr(const MCExpr *E, 1399 MCSymbolRefExpr::VariantKind Variant) { 1400 // Ask the target implementation about this expression first. 1401 const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx); 1402 if (NewE) 1403 return NewE; 1404 // Recurse over the given expression, rebuilding it to apply the given variant 1405 // if there is exactly one symbol. 1406 switch (E->getKind()) { 1407 case MCExpr::Target: 1408 case MCExpr::Constant: 1409 return nullptr; 1410 1411 case MCExpr::SymbolRef: { 1412 const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E); 1413 1414 if (SRE->getKind() != MCSymbolRefExpr::VK_None) { 1415 TokError("invalid variant on expression '" + getTok().getIdentifier() + 1416 "' (already modified)"); 1417 return E; 1418 } 1419 1420 return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext()); 1421 } 1422 1423 case MCExpr::Unary: { 1424 const MCUnaryExpr *UE = cast<MCUnaryExpr>(E); 1425 const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant); 1426 if (!Sub) 1427 return nullptr; 1428 return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext()); 1429 } 1430 1431 case MCExpr::Binary: { 1432 const MCBinaryExpr *BE = cast<MCBinaryExpr>(E); 1433 const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant); 1434 const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant); 1435 1436 if (!LHS && !RHS) 1437 return nullptr; 1438 1439 if (!LHS) 1440 LHS = BE->getLHS(); 1441 if (!RHS) 1442 RHS = BE->getRHS(); 1443 1444 return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext()); 1445 } 1446 } 1447 1448 llvm_unreachable("Invalid expression kind!"); 1449 } 1450 1451 /// This function checks if the next token is <string> type or arithmetic. 1452 /// string that begin with character '<' must end with character '>'. 1453 /// otherwise it is arithmetics. 1454 /// If the function returns a 'true' value, 1455 /// the End argument will be filled with the last location pointed to the '>' 1456 /// character. 1457 1458 /// There is a gap between the AltMacro's documentation and the single quote 1459 /// implementation. GCC does not fully support this feature and so we will not 1460 /// support it. 1461 /// TODO: Adding single quote as a string. 1462 static bool isAngleBracketString(SMLoc &StrLoc, SMLoc &EndLoc) { 1463 assert((StrLoc.getPointer() != nullptr) && 1464 "Argument to the function cannot be a NULL value"); 1465 const char *CharPtr = StrLoc.getPointer(); 1466 while ((*CharPtr != '>') && (*CharPtr != '\n') && (*CharPtr != '\r') && 1467 (*CharPtr != '\0')) { 1468 if (*CharPtr == '!') 1469 CharPtr++; 1470 CharPtr++; 1471 } 1472 if (*CharPtr == '>') { 1473 EndLoc = StrLoc.getFromPointer(CharPtr + 1); 1474 return true; 1475 } 1476 return false; 1477 } 1478 1479 /// creating a string without the escape characters '!'. 1480 static std::string angleBracketString(StringRef AltMacroStr) { 1481 std::string Res; 1482 for (size_t Pos = 0; Pos < AltMacroStr.size(); Pos++) { 1483 if (AltMacroStr[Pos] == '!') 1484 Pos++; 1485 Res += AltMacroStr[Pos]; 1486 } 1487 return Res; 1488 } 1489 1490 /// Parse an expression and return it. 1491 /// 1492 /// expr ::= expr &&,|| expr -> lowest. 1493 /// expr ::= expr |,^,&,! expr 1494 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr 1495 /// expr ::= expr <<,>> expr 1496 /// expr ::= expr +,- expr 1497 /// expr ::= expr *,/,% expr -> highest. 1498 /// expr ::= primaryexpr 1499 /// 1500 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1501 // Parse the expression. 1502 Res = nullptr; 1503 if (getTargetParser().parsePrimaryExpr(Res, EndLoc) || 1504 parseBinOpRHS(1, Res, EndLoc)) 1505 return true; 1506 1507 // As a special case, we support 'a op b @ modifier' by rewriting the 1508 // expression to include the modifier. This is inefficient, but in general we 1509 // expect users to use 'a@modifier op b'. 1510 if (parseOptionalToken(AsmToken::At)) { 1511 if (Lexer.isNot(AsmToken::Identifier)) 1512 return TokError("unexpected symbol modifier following '@'"); 1513 1514 MCSymbolRefExpr::VariantKind Variant = 1515 MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier()); 1516 if (Variant == MCSymbolRefExpr::VK_Invalid) 1517 return TokError("invalid variant '" + getTok().getIdentifier() + "'"); 1518 1519 const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant); 1520 if (!ModifiedRes) { 1521 return TokError("invalid modifier '" + getTok().getIdentifier() + 1522 "' (no symbols present)"); 1523 } 1524 1525 Res = ModifiedRes; 1526 Lex(); 1527 } 1528 1529 // Try to constant fold it up front, if possible. Do not exploit 1530 // assembler here. 1531 int64_t Value; 1532 if (Res->evaluateAsAbsolute(Value)) 1533 Res = MCConstantExpr::create(Value, getContext()); 1534 1535 return false; 1536 } 1537 1538 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) { 1539 Res = nullptr; 1540 return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc); 1541 } 1542 1543 bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res, 1544 SMLoc &EndLoc) { 1545 if (parseParenExpr(Res, EndLoc)) 1546 return true; 1547 1548 for (; ParenDepth > 0; --ParenDepth) { 1549 if (parseBinOpRHS(1, Res, EndLoc)) 1550 return true; 1551 1552 // We don't Lex() the last RParen. 1553 // This is the same behavior as parseParenExpression(). 1554 if (ParenDepth - 1 > 0) { 1555 EndLoc = getTok().getEndLoc(); 1556 if (parseRParen()) 1557 return true; 1558 } 1559 } 1560 return false; 1561 } 1562 1563 bool AsmParser::parseAbsoluteExpression(int64_t &Res) { 1564 const MCExpr *Expr; 1565 1566 SMLoc StartLoc = Lexer.getLoc(); 1567 if (parseExpression(Expr)) 1568 return true; 1569 1570 if (!Expr->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr())) 1571 return Error(StartLoc, "expected absolute expression"); 1572 1573 return false; 1574 } 1575 1576 static unsigned getDarwinBinOpPrecedence(AsmToken::TokenKind K, 1577 MCBinaryExpr::Opcode &Kind, 1578 bool ShouldUseLogicalShr) { 1579 switch (K) { 1580 default: 1581 return 0; // not a binop. 1582 1583 // Lowest Precedence: &&, || 1584 case AsmToken::AmpAmp: 1585 Kind = MCBinaryExpr::LAnd; 1586 return 1; 1587 case AsmToken::PipePipe: 1588 Kind = MCBinaryExpr::LOr; 1589 return 1; 1590 1591 // Low Precedence: |, &, ^ 1592 case AsmToken::Pipe: 1593 Kind = MCBinaryExpr::Or; 1594 return 2; 1595 case AsmToken::Caret: 1596 Kind = MCBinaryExpr::Xor; 1597 return 2; 1598 case AsmToken::Amp: 1599 Kind = MCBinaryExpr::And; 1600 return 2; 1601 1602 // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >= 1603 case AsmToken::EqualEqual: 1604 Kind = MCBinaryExpr::EQ; 1605 return 3; 1606 case AsmToken::ExclaimEqual: 1607 case AsmToken::LessGreater: 1608 Kind = MCBinaryExpr::NE; 1609 return 3; 1610 case AsmToken::Less: 1611 Kind = MCBinaryExpr::LT; 1612 return 3; 1613 case AsmToken::LessEqual: 1614 Kind = MCBinaryExpr::LTE; 1615 return 3; 1616 case AsmToken::Greater: 1617 Kind = MCBinaryExpr::GT; 1618 return 3; 1619 case AsmToken::GreaterEqual: 1620 Kind = MCBinaryExpr::GTE; 1621 return 3; 1622 1623 // Intermediate Precedence: <<, >> 1624 case AsmToken::LessLess: 1625 Kind = MCBinaryExpr::Shl; 1626 return 4; 1627 case AsmToken::GreaterGreater: 1628 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1629 return 4; 1630 1631 // High Intermediate Precedence: +, - 1632 case AsmToken::Plus: 1633 Kind = MCBinaryExpr::Add; 1634 return 5; 1635 case AsmToken::Minus: 1636 Kind = MCBinaryExpr::Sub; 1637 return 5; 1638 1639 // Highest Precedence: *, /, % 1640 case AsmToken::Star: 1641 Kind = MCBinaryExpr::Mul; 1642 return 6; 1643 case AsmToken::Slash: 1644 Kind = MCBinaryExpr::Div; 1645 return 6; 1646 case AsmToken::Percent: 1647 Kind = MCBinaryExpr::Mod; 1648 return 6; 1649 } 1650 } 1651 1652 static unsigned getGNUBinOpPrecedence(const MCAsmInfo &MAI, 1653 AsmToken::TokenKind K, 1654 MCBinaryExpr::Opcode &Kind, 1655 bool ShouldUseLogicalShr) { 1656 switch (K) { 1657 default: 1658 return 0; // not a binop. 1659 1660 // Lowest Precedence: &&, || 1661 case AsmToken::AmpAmp: 1662 Kind = MCBinaryExpr::LAnd; 1663 return 2; 1664 case AsmToken::PipePipe: 1665 Kind = MCBinaryExpr::LOr; 1666 return 1; 1667 1668 // Low Precedence: ==, !=, <>, <, <=, >, >= 1669 case AsmToken::EqualEqual: 1670 Kind = MCBinaryExpr::EQ; 1671 return 3; 1672 case AsmToken::ExclaimEqual: 1673 case AsmToken::LessGreater: 1674 Kind = MCBinaryExpr::NE; 1675 return 3; 1676 case AsmToken::Less: 1677 Kind = MCBinaryExpr::LT; 1678 return 3; 1679 case AsmToken::LessEqual: 1680 Kind = MCBinaryExpr::LTE; 1681 return 3; 1682 case AsmToken::Greater: 1683 Kind = MCBinaryExpr::GT; 1684 return 3; 1685 case AsmToken::GreaterEqual: 1686 Kind = MCBinaryExpr::GTE; 1687 return 3; 1688 1689 // Low Intermediate Precedence: +, - 1690 case AsmToken::Plus: 1691 Kind = MCBinaryExpr::Add; 1692 return 4; 1693 case AsmToken::Minus: 1694 Kind = MCBinaryExpr::Sub; 1695 return 4; 1696 1697 // High Intermediate Precedence: |, !, &, ^ 1698 // 1699 case AsmToken::Pipe: 1700 Kind = MCBinaryExpr::Or; 1701 return 5; 1702 case AsmToken::Exclaim: 1703 // Hack to support ARM compatible aliases (implied 'sp' operand in 'srs*' 1704 // instructions like 'srsda #31!') and not parse ! as an infix operator. 1705 if (MAI.getCommentString() == "@") 1706 return 0; 1707 Kind = MCBinaryExpr::OrNot; 1708 return 5; 1709 case AsmToken::Caret: 1710 Kind = MCBinaryExpr::Xor; 1711 return 5; 1712 case AsmToken::Amp: 1713 Kind = MCBinaryExpr::And; 1714 return 5; 1715 1716 // Highest Precedence: *, /, %, <<, >> 1717 case AsmToken::Star: 1718 Kind = MCBinaryExpr::Mul; 1719 return 6; 1720 case AsmToken::Slash: 1721 Kind = MCBinaryExpr::Div; 1722 return 6; 1723 case AsmToken::Percent: 1724 Kind = MCBinaryExpr::Mod; 1725 return 6; 1726 case AsmToken::LessLess: 1727 Kind = MCBinaryExpr::Shl; 1728 return 6; 1729 case AsmToken::GreaterGreater: 1730 Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr; 1731 return 6; 1732 } 1733 } 1734 1735 unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K, 1736 MCBinaryExpr::Opcode &Kind) { 1737 bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr(); 1738 return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr) 1739 : getGNUBinOpPrecedence(MAI, K, Kind, ShouldUseLogicalShr); 1740 } 1741 1742 /// Parse all binary operators with precedence >= 'Precedence'. 1743 /// Res contains the LHS of the expression on input. 1744 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, 1745 SMLoc &EndLoc) { 1746 SMLoc StartLoc = Lexer.getLoc(); 1747 while (true) { 1748 MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add; 1749 unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind); 1750 1751 // If the next token is lower precedence than we are allowed to eat, return 1752 // successfully with what we ate already. 1753 if (TokPrec < Precedence) 1754 return false; 1755 1756 Lex(); 1757 1758 // Eat the next primary expression. 1759 const MCExpr *RHS; 1760 if (getTargetParser().parsePrimaryExpr(RHS, EndLoc)) 1761 return true; 1762 1763 // If BinOp binds less tightly with RHS than the operator after RHS, let 1764 // the pending operator take RHS as its LHS. 1765 MCBinaryExpr::Opcode Dummy; 1766 unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy); 1767 if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc)) 1768 return true; 1769 1770 // Merge LHS and RHS according to operator. 1771 Res = MCBinaryExpr::create(Kind, Res, RHS, getContext(), StartLoc); 1772 } 1773 } 1774 1775 /// ParseStatement: 1776 /// ::= EndOfStatement 1777 /// ::= Label* Directive ...Operands... EndOfStatement 1778 /// ::= Label* Identifier OperandList* EndOfStatement 1779 bool AsmParser::parseStatement(ParseStatementInfo &Info, 1780 MCAsmParserSemaCallback *SI) { 1781 assert(!hasPendingError() && "parseStatement started with pending error"); 1782 // Eat initial spaces and comments 1783 while (Lexer.is(AsmToken::Space)) 1784 Lex(); 1785 if (Lexer.is(AsmToken::EndOfStatement)) { 1786 // if this is a line comment we can drop it safely 1787 if (getTok().getString().empty() || getTok().getString().front() == '\r' || 1788 getTok().getString().front() == '\n') 1789 Out.addBlankLine(); 1790 Lex(); 1791 return false; 1792 } 1793 // Statements always start with an identifier. 1794 AsmToken ID = getTok(); 1795 SMLoc IDLoc = ID.getLoc(); 1796 StringRef IDVal; 1797 int64_t LocalLabelVal = -1; 1798 StartTokLoc = ID.getLoc(); 1799 if (Lexer.is(AsmToken::HashDirective)) 1800 return parseCppHashLineFilenameComment(IDLoc, 1801 !isInsideMacroInstantiation()); 1802 1803 // Allow an integer followed by a ':' as a directional local label. 1804 if (Lexer.is(AsmToken::Integer)) { 1805 LocalLabelVal = getTok().getIntVal(); 1806 if (LocalLabelVal < 0) { 1807 if (!TheCondState.Ignore) { 1808 Lex(); // always eat a token 1809 return Error(IDLoc, "unexpected token at start of statement"); 1810 } 1811 IDVal = ""; 1812 } else { 1813 IDVal = getTok().getString(); 1814 Lex(); // Consume the integer token to be used as an identifier token. 1815 if (Lexer.getKind() != AsmToken::Colon) { 1816 if (!TheCondState.Ignore) { 1817 Lex(); // always eat a token 1818 return Error(IDLoc, "unexpected token at start of statement"); 1819 } 1820 } 1821 } 1822 } else if (Lexer.is(AsmToken::Dot)) { 1823 // Treat '.' as a valid identifier in this context. 1824 Lex(); 1825 IDVal = "."; 1826 } else if (Lexer.is(AsmToken::LCurly)) { 1827 // Treat '{' as a valid identifier in this context. 1828 Lex(); 1829 IDVal = "{"; 1830 1831 } else if (Lexer.is(AsmToken::RCurly)) { 1832 // Treat '}' as a valid identifier in this context. 1833 Lex(); 1834 IDVal = "}"; 1835 } else if (Lexer.is(AsmToken::Star) && 1836 getTargetParser().starIsStartOfStatement()) { 1837 // Accept '*' as a valid start of statement. 1838 Lex(); 1839 IDVal = "*"; 1840 } else if (parseIdentifier(IDVal)) { 1841 if (!TheCondState.Ignore) { 1842 Lex(); // always eat a token 1843 return Error(IDLoc, "unexpected token at start of statement"); 1844 } 1845 IDVal = ""; 1846 } 1847 1848 // Handle conditional assembly here before checking for skipping. We 1849 // have to do this so that .endif isn't skipped in a ".if 0" block for 1850 // example. 1851 StringMap<DirectiveKind>::const_iterator DirKindIt = 1852 DirectiveKindMap.find(IDVal.lower()); 1853 DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end()) 1854 ? DK_NO_DIRECTIVE 1855 : DirKindIt->getValue(); 1856 switch (DirKind) { 1857 default: 1858 break; 1859 case DK_IF: 1860 case DK_IFEQ: 1861 case DK_IFGE: 1862 case DK_IFGT: 1863 case DK_IFLE: 1864 case DK_IFLT: 1865 case DK_IFNE: 1866 return parseDirectiveIf(IDLoc, DirKind); 1867 case DK_IFB: 1868 return parseDirectiveIfb(IDLoc, true); 1869 case DK_IFNB: 1870 return parseDirectiveIfb(IDLoc, false); 1871 case DK_IFC: 1872 return parseDirectiveIfc(IDLoc, true); 1873 case DK_IFEQS: 1874 return parseDirectiveIfeqs(IDLoc, true); 1875 case DK_IFNC: 1876 return parseDirectiveIfc(IDLoc, false); 1877 case DK_IFNES: 1878 return parseDirectiveIfeqs(IDLoc, false); 1879 case DK_IFDEF: 1880 return parseDirectiveIfdef(IDLoc, true); 1881 case DK_IFNDEF: 1882 case DK_IFNOTDEF: 1883 return parseDirectiveIfdef(IDLoc, false); 1884 case DK_ELSEIF: 1885 return parseDirectiveElseIf(IDLoc); 1886 case DK_ELSE: 1887 return parseDirectiveElse(IDLoc); 1888 case DK_ENDIF: 1889 return parseDirectiveEndIf(IDLoc); 1890 } 1891 1892 // Ignore the statement if in the middle of inactive conditional 1893 // (e.g. ".if 0"). 1894 if (TheCondState.Ignore) { 1895 eatToEndOfStatement(); 1896 return false; 1897 } 1898 1899 // FIXME: Recurse on local labels? 1900 1901 // Check for a label. 1902 // ::= identifier ':' 1903 // ::= number ':' 1904 if (Lexer.is(AsmToken::Colon) && getTargetParser().isLabel(ID)) { 1905 if (checkForValidSection()) 1906 return true; 1907 1908 Lex(); // Consume the ':'. 1909 1910 // Diagnose attempt to use '.' as a label. 1911 if (IDVal == ".") 1912 return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label"); 1913 1914 // Diagnose attempt to use a variable as a label. 1915 // 1916 // FIXME: Diagnostics. Note the location of the definition as a label. 1917 // FIXME: This doesn't diagnose assignment to a symbol which has been 1918 // implicitly marked as external. 1919 MCSymbol *Sym; 1920 if (LocalLabelVal == -1) { 1921 if (ParsingMSInlineAsm && SI) { 1922 StringRef RewrittenLabel = 1923 SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true); 1924 assert(!RewrittenLabel.empty() && 1925 "We should have an internal name here."); 1926 Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(), 1927 RewrittenLabel); 1928 IDVal = RewrittenLabel; 1929 } 1930 Sym = getContext().getOrCreateSymbol(IDVal); 1931 } else 1932 Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal); 1933 // End of Labels should be treated as end of line for lexing 1934 // purposes but that information is not available to the Lexer who 1935 // does not understand Labels. This may cause us to see a Hash 1936 // here instead of a preprocessor line comment. 1937 if (getTok().is(AsmToken::Hash)) { 1938 StringRef CommentStr = parseStringToEndOfStatement(); 1939 Lexer.Lex(); 1940 Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr)); 1941 } 1942 1943 // Consume any end of statement token, if present, to avoid spurious 1944 // addBlankLine calls(). 1945 if (getTok().is(AsmToken::EndOfStatement)) { 1946 Lex(); 1947 } 1948 1949 if (MAI.hasSubsectionsViaSymbols() && CFIStartProcLoc && 1950 Sym->isExternal() && !cast<MCSymbolMachO>(Sym)->isAltEntry()) 1951 return Error(StartTokLoc, "non-private labels cannot appear between " 1952 ".cfi_startproc / .cfi_endproc pairs") && 1953 Error(*CFIStartProcLoc, "previous .cfi_startproc was here"); 1954 1955 if (discardLTOSymbol(IDVal)) 1956 return false; 1957 1958 getTargetParser().doBeforeLabelEmit(Sym, IDLoc); 1959 1960 // Emit the label. 1961 if (!getTargetParser().isParsingMSInlineAsm()) 1962 Out.emitLabel(Sym, IDLoc); 1963 1964 // If we are generating dwarf for assembly source files then gather the 1965 // info to make a dwarf label entry for this label if needed. 1966 if (enabledGenDwarfForAssembly()) 1967 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), 1968 IDLoc); 1969 1970 getTargetParser().onLabelParsed(Sym); 1971 1972 return false; 1973 } 1974 1975 // Check for an assignment statement. 1976 // ::= identifier '=' 1977 if (Lexer.is(AsmToken::Equal) && getTargetParser().equalIsAsmAssignment()) { 1978 Lex(); 1979 return parseAssignment(IDVal, AssignmentKind::Equal); 1980 } 1981 1982 // If macros are enabled, check to see if this is a macro instantiation. 1983 if (areMacrosEnabled()) 1984 if (MCAsmMacro *M = getContext().lookupMacro(IDVal)) 1985 return handleMacroEntry(M, IDLoc); 1986 1987 // Otherwise, we have a normal instruction or directive. 1988 1989 // Directives start with "." 1990 if (IDVal.starts_with(".") && IDVal != ".") { 1991 // There are several entities interested in parsing directives: 1992 // 1993 // 1. The target-specific assembly parser. Some directives are target 1994 // specific or may potentially behave differently on certain targets. 1995 // 2. Asm parser extensions. For example, platform-specific parsers 1996 // (like the ELF parser) register themselves as extensions. 1997 // 3. The generic directive parser implemented by this class. These are 1998 // all the directives that behave in a target and platform independent 1999 // manner, or at least have a default behavior that's shared between 2000 // all targets and platforms. 2001 2002 getTargetParser().flushPendingInstructions(getStreamer()); 2003 2004 ParseStatus TPDirectiveReturn = getTargetParser().parseDirective(ID); 2005 assert(TPDirectiveReturn.isFailure() == hasPendingError() && 2006 "Should only return Failure iff there was an error"); 2007 if (TPDirectiveReturn.isFailure()) 2008 return true; 2009 if (TPDirectiveReturn.isSuccess()) 2010 return false; 2011 2012 // Next, check the extension directive map to see if any extension has 2013 // registered itself to parse this directive. 2014 std::pair<MCAsmParserExtension *, DirectiveHandler> Handler = 2015 ExtensionDirectiveMap.lookup(IDVal); 2016 if (Handler.first) 2017 return (*Handler.second)(Handler.first, IDVal, IDLoc); 2018 2019 // Finally, if no one else is interested in this directive, it must be 2020 // generic and familiar to this class. 2021 switch (DirKind) { 2022 default: 2023 break; 2024 case DK_SET: 2025 case DK_EQU: 2026 return parseDirectiveSet(IDVal, AssignmentKind::Set); 2027 case DK_EQUIV: 2028 return parseDirectiveSet(IDVal, AssignmentKind::Equiv); 2029 case DK_LTO_SET_CONDITIONAL: 2030 return parseDirectiveSet(IDVal, AssignmentKind::LTOSetConditional); 2031 case DK_ASCII: 2032 return parseDirectiveAscii(IDVal, false); 2033 case DK_ASCIZ: 2034 case DK_STRING: 2035 return parseDirectiveAscii(IDVal, true); 2036 case DK_BYTE: 2037 case DK_DC_B: 2038 return parseDirectiveValue(IDVal, 1); 2039 case DK_DC: 2040 case DK_DC_W: 2041 case DK_SHORT: 2042 case DK_VALUE: 2043 case DK_2BYTE: 2044 return parseDirectiveValue(IDVal, 2); 2045 case DK_LONG: 2046 case DK_INT: 2047 case DK_4BYTE: 2048 case DK_DC_L: 2049 return parseDirectiveValue(IDVal, 4); 2050 case DK_QUAD: 2051 case DK_8BYTE: 2052 return parseDirectiveValue(IDVal, 8); 2053 case DK_DC_A: 2054 return parseDirectiveValue( 2055 IDVal, getContext().getAsmInfo()->getCodePointerSize()); 2056 case DK_OCTA: 2057 return parseDirectiveOctaValue(IDVal); 2058 case DK_SINGLE: 2059 case DK_FLOAT: 2060 case DK_DC_S: 2061 return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle()); 2062 case DK_DOUBLE: 2063 case DK_DC_D: 2064 return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble()); 2065 case DK_ALIGN: { 2066 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 2067 return parseDirectiveAlign(IsPow2, /*ExprSize=*/1); 2068 } 2069 case DK_ALIGN32: { 2070 bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes(); 2071 return parseDirectiveAlign(IsPow2, /*ExprSize=*/4); 2072 } 2073 case DK_BALIGN: 2074 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1); 2075 case DK_BALIGNW: 2076 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2); 2077 case DK_BALIGNL: 2078 return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4); 2079 case DK_P2ALIGN: 2080 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1); 2081 case DK_P2ALIGNW: 2082 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2); 2083 case DK_P2ALIGNL: 2084 return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4); 2085 case DK_ORG: 2086 return parseDirectiveOrg(); 2087 case DK_FILL: 2088 return parseDirectiveFill(); 2089 case DK_ZERO: 2090 return parseDirectiveZero(); 2091 case DK_EXTERN: 2092 eatToEndOfStatement(); // .extern is the default, ignore it. 2093 return false; 2094 case DK_GLOBL: 2095 case DK_GLOBAL: 2096 return parseDirectiveSymbolAttribute(MCSA_Global); 2097 case DK_LAZY_REFERENCE: 2098 return parseDirectiveSymbolAttribute(MCSA_LazyReference); 2099 case DK_NO_DEAD_STRIP: 2100 return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip); 2101 case DK_SYMBOL_RESOLVER: 2102 return parseDirectiveSymbolAttribute(MCSA_SymbolResolver); 2103 case DK_PRIVATE_EXTERN: 2104 return parseDirectiveSymbolAttribute(MCSA_PrivateExtern); 2105 case DK_REFERENCE: 2106 return parseDirectiveSymbolAttribute(MCSA_Reference); 2107 case DK_WEAK_DEFINITION: 2108 return parseDirectiveSymbolAttribute(MCSA_WeakDefinition); 2109 case DK_WEAK_REFERENCE: 2110 return parseDirectiveSymbolAttribute(MCSA_WeakReference); 2111 case DK_WEAK_DEF_CAN_BE_HIDDEN: 2112 return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate); 2113 case DK_COLD: 2114 return parseDirectiveSymbolAttribute(MCSA_Cold); 2115 case DK_COMM: 2116 case DK_COMMON: 2117 return parseDirectiveComm(/*IsLocal=*/false); 2118 case DK_LCOMM: 2119 return parseDirectiveComm(/*IsLocal=*/true); 2120 case DK_ABORT: 2121 return parseDirectiveAbort(IDLoc); 2122 case DK_INCLUDE: 2123 return parseDirectiveInclude(); 2124 case DK_INCBIN: 2125 return parseDirectiveIncbin(); 2126 case DK_CODE16: 2127 case DK_CODE16GCC: 2128 return TokError(Twine(IDVal) + 2129 " not currently supported for this target"); 2130 case DK_REPT: 2131 return parseDirectiveRept(IDLoc, IDVal); 2132 case DK_IRP: 2133 return parseDirectiveIrp(IDLoc); 2134 case DK_IRPC: 2135 return parseDirectiveIrpc(IDLoc); 2136 case DK_ENDR: 2137 return parseDirectiveEndr(IDLoc); 2138 case DK_BUNDLE_ALIGN_MODE: 2139 return parseDirectiveBundleAlignMode(); 2140 case DK_BUNDLE_LOCK: 2141 return parseDirectiveBundleLock(); 2142 case DK_BUNDLE_UNLOCK: 2143 return parseDirectiveBundleUnlock(); 2144 case DK_SLEB128: 2145 return parseDirectiveLEB128(true); 2146 case DK_ULEB128: 2147 return parseDirectiveLEB128(false); 2148 case DK_SPACE: 2149 case DK_SKIP: 2150 return parseDirectiveSpace(IDVal); 2151 case DK_FILE: 2152 return parseDirectiveFile(IDLoc); 2153 case DK_LINE: 2154 return parseDirectiveLine(); 2155 case DK_LOC: 2156 return parseDirectiveLoc(); 2157 case DK_LOC_LABEL: 2158 return parseDirectiveLocLabel(IDLoc); 2159 case DK_STABS: 2160 return parseDirectiveStabs(); 2161 case DK_CV_FILE: 2162 return parseDirectiveCVFile(); 2163 case DK_CV_FUNC_ID: 2164 return parseDirectiveCVFuncId(); 2165 case DK_CV_INLINE_SITE_ID: 2166 return parseDirectiveCVInlineSiteId(); 2167 case DK_CV_LOC: 2168 return parseDirectiveCVLoc(); 2169 case DK_CV_LINETABLE: 2170 return parseDirectiveCVLinetable(); 2171 case DK_CV_INLINE_LINETABLE: 2172 return parseDirectiveCVInlineLinetable(); 2173 case DK_CV_DEF_RANGE: 2174 return parseDirectiveCVDefRange(); 2175 case DK_CV_STRING: 2176 return parseDirectiveCVString(); 2177 case DK_CV_STRINGTABLE: 2178 return parseDirectiveCVStringTable(); 2179 case DK_CV_FILECHECKSUMS: 2180 return parseDirectiveCVFileChecksums(); 2181 case DK_CV_FILECHECKSUM_OFFSET: 2182 return parseDirectiveCVFileChecksumOffset(); 2183 case DK_CV_FPO_DATA: 2184 return parseDirectiveCVFPOData(); 2185 case DK_CFI_SECTIONS: 2186 return parseDirectiveCFISections(); 2187 case DK_CFI_STARTPROC: 2188 return parseDirectiveCFIStartProc(); 2189 case DK_CFI_ENDPROC: 2190 return parseDirectiveCFIEndProc(); 2191 case DK_CFI_DEF_CFA: 2192 return parseDirectiveCFIDefCfa(IDLoc); 2193 case DK_CFI_DEF_CFA_OFFSET: 2194 return parseDirectiveCFIDefCfaOffset(IDLoc); 2195 case DK_CFI_ADJUST_CFA_OFFSET: 2196 return parseDirectiveCFIAdjustCfaOffset(IDLoc); 2197 case DK_CFI_DEF_CFA_REGISTER: 2198 return parseDirectiveCFIDefCfaRegister(IDLoc); 2199 case DK_CFI_LLVM_DEF_ASPACE_CFA: 2200 return parseDirectiveCFILLVMDefAspaceCfa(IDLoc); 2201 case DK_CFI_OFFSET: 2202 return parseDirectiveCFIOffset(IDLoc); 2203 case DK_CFI_REL_OFFSET: 2204 return parseDirectiveCFIRelOffset(IDLoc); 2205 case DK_CFI_PERSONALITY: 2206 return parseDirectiveCFIPersonalityOrLsda(true); 2207 case DK_CFI_LSDA: 2208 return parseDirectiveCFIPersonalityOrLsda(false); 2209 case DK_CFI_REMEMBER_STATE: 2210 return parseDirectiveCFIRememberState(IDLoc); 2211 case DK_CFI_RESTORE_STATE: 2212 return parseDirectiveCFIRestoreState(IDLoc); 2213 case DK_CFI_SAME_VALUE: 2214 return parseDirectiveCFISameValue(IDLoc); 2215 case DK_CFI_RESTORE: 2216 return parseDirectiveCFIRestore(IDLoc); 2217 case DK_CFI_ESCAPE: 2218 return parseDirectiveCFIEscape(IDLoc); 2219 case DK_CFI_RETURN_COLUMN: 2220 return parseDirectiveCFIReturnColumn(IDLoc); 2221 case DK_CFI_SIGNAL_FRAME: 2222 return parseDirectiveCFISignalFrame(IDLoc); 2223 case DK_CFI_UNDEFINED: 2224 return parseDirectiveCFIUndefined(IDLoc); 2225 case DK_CFI_REGISTER: 2226 return parseDirectiveCFIRegister(IDLoc); 2227 case DK_CFI_WINDOW_SAVE: 2228 return parseDirectiveCFIWindowSave(IDLoc); 2229 case DK_CFI_LABEL: 2230 return parseDirectiveCFILabel(IDLoc); 2231 case DK_CFI_VAL_OFFSET: 2232 return parseDirectiveCFIValOffset(IDLoc); 2233 case DK_MACROS_ON: 2234 case DK_MACROS_OFF: 2235 return parseDirectiveMacrosOnOff(IDVal); 2236 case DK_MACRO: 2237 return parseDirectiveMacro(IDLoc); 2238 case DK_ALTMACRO: 2239 case DK_NOALTMACRO: 2240 return parseDirectiveAltmacro(IDVal); 2241 case DK_EXITM: 2242 return parseDirectiveExitMacro(IDVal); 2243 case DK_ENDM: 2244 case DK_ENDMACRO: 2245 return parseDirectiveEndMacro(IDVal); 2246 case DK_PURGEM: 2247 return parseDirectivePurgeMacro(IDLoc); 2248 case DK_END: 2249 return parseDirectiveEnd(IDLoc); 2250 case DK_ERR: 2251 return parseDirectiveError(IDLoc, false); 2252 case DK_ERROR: 2253 return parseDirectiveError(IDLoc, true); 2254 case DK_WARNING: 2255 return parseDirectiveWarning(IDLoc); 2256 case DK_RELOC: 2257 return parseDirectiveReloc(IDLoc); 2258 case DK_DCB: 2259 case DK_DCB_W: 2260 return parseDirectiveDCB(IDVal, 2); 2261 case DK_DCB_B: 2262 return parseDirectiveDCB(IDVal, 1); 2263 case DK_DCB_D: 2264 return parseDirectiveRealDCB(IDVal, APFloat::IEEEdouble()); 2265 case DK_DCB_L: 2266 return parseDirectiveDCB(IDVal, 4); 2267 case DK_DCB_S: 2268 return parseDirectiveRealDCB(IDVal, APFloat::IEEEsingle()); 2269 case DK_DC_X: 2270 case DK_DCB_X: 2271 return TokError(Twine(IDVal) + 2272 " not currently supported for this target"); 2273 case DK_DS: 2274 case DK_DS_W: 2275 return parseDirectiveDS(IDVal, 2); 2276 case DK_DS_B: 2277 return parseDirectiveDS(IDVal, 1); 2278 case DK_DS_D: 2279 return parseDirectiveDS(IDVal, 8); 2280 case DK_DS_L: 2281 case DK_DS_S: 2282 return parseDirectiveDS(IDVal, 4); 2283 case DK_DS_P: 2284 case DK_DS_X: 2285 return parseDirectiveDS(IDVal, 12); 2286 case DK_PRINT: 2287 return parseDirectivePrint(IDLoc); 2288 case DK_ADDRSIG: 2289 return parseDirectiveAddrsig(); 2290 case DK_ADDRSIG_SYM: 2291 return parseDirectiveAddrsigSym(); 2292 case DK_PSEUDO_PROBE: 2293 return parseDirectivePseudoProbe(); 2294 case DK_LTO_DISCARD: 2295 return parseDirectiveLTODiscard(); 2296 case DK_MEMTAG: 2297 return parseDirectiveSymbolAttribute(MCSA_Memtag); 2298 } 2299 2300 return Error(IDLoc, "unknown directive"); 2301 } 2302 2303 // __asm _emit or __asm __emit 2304 if (ParsingMSInlineAsm && (IDVal == "_emit" || IDVal == "__emit" || 2305 IDVal == "_EMIT" || IDVal == "__EMIT")) 2306 return parseDirectiveMSEmit(IDLoc, Info, IDVal.size()); 2307 2308 // __asm align 2309 if (ParsingMSInlineAsm && (IDVal == "align" || IDVal == "ALIGN")) 2310 return parseDirectiveMSAlign(IDLoc, Info); 2311 2312 if (ParsingMSInlineAsm && (IDVal == "even" || IDVal == "EVEN")) 2313 Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4); 2314 if (checkForValidSection()) 2315 return true; 2316 2317 return parseAndMatchAndEmitTargetInstruction(Info, IDVal, ID, IDLoc); 2318 } 2319 2320 bool AsmParser::parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info, 2321 StringRef IDVal, 2322 AsmToken ID, 2323 SMLoc IDLoc) { 2324 // Canonicalize the opcode to lower case. 2325 std::string OpcodeStr = IDVal.lower(); 2326 ParseInstructionInfo IInfo(Info.AsmRewrites); 2327 bool ParseHadError = getTargetParser().parseInstruction(IInfo, OpcodeStr, ID, 2328 Info.ParsedOperands); 2329 Info.ParseError = ParseHadError; 2330 2331 // Dump the parsed representation, if requested. 2332 if (getShowParsedOperands()) { 2333 SmallString<256> Str; 2334 raw_svector_ostream OS(Str); 2335 OS << "parsed instruction: ["; 2336 for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) { 2337 if (i != 0) 2338 OS << ", "; 2339 Info.ParsedOperands[i]->print(OS); 2340 } 2341 OS << "]"; 2342 2343 printMessage(IDLoc, SourceMgr::DK_Note, OS.str()); 2344 } 2345 2346 // Fail even if ParseInstruction erroneously returns false. 2347 if (hasPendingError() || ParseHadError) 2348 return true; 2349 2350 // If we are generating dwarf for the current section then generate a .loc 2351 // directive for the instruction. 2352 if (!ParseHadError && enabledGenDwarfForAssembly() && 2353 getContext().getGenDwarfSectionSyms().count( 2354 getStreamer().getCurrentSectionOnly())) { 2355 unsigned Line; 2356 if (ActiveMacros.empty()) 2357 Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer); 2358 else 2359 Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc, 2360 ActiveMacros.front()->ExitBuffer); 2361 2362 // If we previously parsed a cpp hash file line comment then make sure the 2363 // current Dwarf File is for the CppHashFilename if not then emit the 2364 // Dwarf File table for it and adjust the line number for the .loc. 2365 if (!CppHashInfo.Filename.empty()) { 2366 unsigned FileNumber = getStreamer().emitDwarfFileDirective( 2367 0, StringRef(), CppHashInfo.Filename); 2368 getContext().setGenDwarfFileNumber(FileNumber); 2369 2370 unsigned CppHashLocLineNo = 2371 SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf); 2372 Line = CppHashInfo.LineNumber - 1 + (Line - CppHashLocLineNo); 2373 } 2374 2375 getStreamer().emitDwarfLocDirective( 2376 getContext().getGenDwarfFileNumber(), Line, 0, 2377 DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0, 2378 StringRef()); 2379 } 2380 2381 // If parsing succeeded, match the instruction. 2382 if (!ParseHadError) { 2383 uint64_t ErrorInfo; 2384 if (getTargetParser().matchAndEmitInstruction( 2385 IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo, 2386 getTargetParser().isParsingMSInlineAsm())) 2387 return true; 2388 } 2389 return false; 2390 } 2391 2392 // Parse and erase curly braces marking block start/end 2393 bool 2394 AsmParser::parseCurlyBlockScope(SmallVectorImpl<AsmRewrite> &AsmStrRewrites) { 2395 // Identify curly brace marking block start/end 2396 if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly)) 2397 return false; 2398 2399 SMLoc StartLoc = Lexer.getLoc(); 2400 Lex(); // Eat the brace 2401 if (Lexer.is(AsmToken::EndOfStatement)) 2402 Lex(); // Eat EndOfStatement following the brace 2403 2404 // Erase the block start/end brace from the output asm string 2405 AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() - 2406 StartLoc.getPointer()); 2407 return true; 2408 } 2409 2410 /// parseCppHashLineFilenameComment as this: 2411 /// ::= # number "filename" 2412 bool AsmParser::parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo) { 2413 Lex(); // Eat the hash token. 2414 // Lexer only ever emits HashDirective if it fully formed if it's 2415 // done the checking already so this is an internal error. 2416 assert(getTok().is(AsmToken::Integer) && 2417 "Lexing Cpp line comment: Expected Integer"); 2418 int64_t LineNumber = getTok().getIntVal(); 2419 Lex(); 2420 assert(getTok().is(AsmToken::String) && 2421 "Lexing Cpp line comment: Expected String"); 2422 StringRef Filename = getTok().getString(); 2423 Lex(); 2424 2425 if (!SaveLocInfo) 2426 return false; 2427 2428 // Get rid of the enclosing quotes. 2429 Filename = Filename.substr(1, Filename.size() - 2); 2430 2431 // Save the SMLoc, Filename and LineNumber for later use by diagnostics 2432 // and possibly DWARF file info. 2433 CppHashInfo.Loc = L; 2434 CppHashInfo.Filename = Filename; 2435 CppHashInfo.LineNumber = LineNumber; 2436 CppHashInfo.Buf = CurBuffer; 2437 if (!HadCppHashFilename) { 2438 HadCppHashFilename = true; 2439 // If we haven't encountered any .file directives, then the first #line 2440 // directive describes the "root" file and directory of the compilation 2441 // unit. 2442 if (getContext().getGenDwarfForAssembly() && 2443 getContext().getGenDwarfFileNumber() == 0) { 2444 // It's preprocessed, so there is no checksum, and of course no source 2445 // directive. 2446 getContext().setMCLineTableRootFile( 2447 /*CUID=*/0, getContext().getCompilationDir(), Filename, 2448 /*Cksum=*/std::nullopt, /*Source=*/std::nullopt); 2449 } 2450 } 2451 return false; 2452 } 2453 2454 /// will use the last parsed cpp hash line filename comment 2455 /// for the Filename and LineNo if any in the diagnostic. 2456 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) { 2457 auto *Parser = static_cast<AsmParser *>(Context); 2458 raw_ostream &OS = errs(); 2459 2460 const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr(); 2461 SMLoc DiagLoc = Diag.getLoc(); 2462 unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 2463 unsigned CppHashBuf = 2464 Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashInfo.Loc); 2465 2466 // Like SourceMgr::printMessage() we need to print the include stack if any 2467 // before printing the message. 2468 unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc); 2469 if (!Parser->SavedDiagHandler && DiagCurBuffer && 2470 DiagCurBuffer != DiagSrcMgr.getMainFileID()) { 2471 SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer); 2472 DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS); 2473 } 2474 2475 // If we have not parsed a cpp hash line filename comment or the source 2476 // manager changed or buffer changed (like in a nested include) then just 2477 // print the normal diagnostic using its Filename and LineNo. 2478 if (!Parser->CppHashInfo.LineNumber || DiagBuf != CppHashBuf) { 2479 if (Parser->SavedDiagHandler) 2480 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); 2481 else 2482 Parser->getContext().diagnose(Diag); 2483 return; 2484 } 2485 2486 // Use the CppHashFilename and calculate a line number based on the 2487 // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc 2488 // for the diagnostic. 2489 const std::string &Filename = std::string(Parser->CppHashInfo.Filename); 2490 2491 int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf); 2492 int CppHashLocLineNo = 2493 Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf); 2494 int LineNo = 2495 Parser->CppHashInfo.LineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo); 2496 2497 SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo, 2498 Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(), 2499 Diag.getLineContents(), Diag.getRanges()); 2500 2501 if (Parser->SavedDiagHandler) 2502 Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext); 2503 else 2504 Parser->getContext().diagnose(NewDiag); 2505 } 2506 2507 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The 2508 // difference being that that function accepts '@' as part of identifiers and 2509 // we can't do that. AsmLexer.cpp should probably be changed to handle 2510 // '@' as a special case when needed. 2511 static bool isIdentifierChar(char c) { 2512 return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' || 2513 c == '.'; 2514 } 2515 2516 bool AsmParser::expandMacro(raw_svector_ostream &OS, MCAsmMacro &Macro, 2517 ArrayRef<MCAsmMacroParameter> Parameters, 2518 ArrayRef<MCAsmMacroArgument> A, 2519 bool EnableAtPseudoVariable) { 2520 unsigned NParameters = Parameters.size(); 2521 auto expandArg = [&](unsigned Index) { 2522 bool HasVararg = NParameters ? Parameters.back().Vararg : false; 2523 bool VarargParameter = HasVararg && Index == (NParameters - 1); 2524 for (const AsmToken &Token : A[Index]) 2525 // For altmacro mode, you can write '%expr'. 2526 // The prefix '%' evaluates the expression 'expr' 2527 // and uses the result as a string (e.g. replace %(1+2) with the 2528 // string "3"). 2529 // Here, we identify the integer token which is the result of the 2530 // absolute expression evaluation and replace it with its string 2531 // representation. 2532 if (AltMacroMode && Token.getString().front() == '%' && 2533 Token.is(AsmToken::Integer)) 2534 // Emit an integer value to the buffer. 2535 OS << Token.getIntVal(); 2536 // Only Token that was validated as a string and begins with '<' 2537 // is considered altMacroString!!! 2538 else if (AltMacroMode && Token.getString().front() == '<' && 2539 Token.is(AsmToken::String)) { 2540 OS << angleBracketString(Token.getStringContents()); 2541 } 2542 // We expect no quotes around the string's contents when 2543 // parsing for varargs. 2544 else if (Token.isNot(AsmToken::String) || VarargParameter) 2545 OS << Token.getString(); 2546 else 2547 OS << Token.getStringContents(); 2548 }; 2549 2550 // A macro without parameters is handled differently on Darwin: 2551 // gas accepts no arguments and does no substitutions 2552 StringRef Body = Macro.Body; 2553 size_t I = 0, End = Body.size(); 2554 while (I != End) { 2555 if (Body[I] == '\\' && I + 1 != End) { 2556 // Check for \@ and \+ pseudo variables. 2557 if (EnableAtPseudoVariable && Body[I + 1] == '@') { 2558 OS << NumOfMacroInstantiations; 2559 I += 2; 2560 continue; 2561 } 2562 if (Body[I + 1] == '+') { 2563 OS << Macro.Count; 2564 I += 2; 2565 continue; 2566 } 2567 if (Body[I + 1] == '(' && Body[I + 2] == ')') { 2568 I += 3; 2569 continue; 2570 } 2571 2572 size_t Pos = ++I; 2573 while (I != End && isIdentifierChar(Body[I])) 2574 ++I; 2575 StringRef Argument(Body.data() + Pos, I - Pos); 2576 if (AltMacroMode && I != End && Body[I] == '&') 2577 ++I; 2578 unsigned Index = 0; 2579 for (; Index < NParameters; ++Index) 2580 if (Parameters[Index].Name == Argument) 2581 break; 2582 if (Index == NParameters) 2583 OS << '\\' << Argument; 2584 else 2585 expandArg(Index); 2586 continue; 2587 } 2588 2589 // In Darwin mode, $ is used for macro expansion, not considered an 2590 // identifier char. 2591 if (Body[I] == '$' && I + 1 != End && IsDarwin && !NParameters) { 2592 // This macro has no parameters, look for $0, $1, etc. 2593 switch (Body[I + 1]) { 2594 // $$ => $ 2595 case '$': 2596 OS << '$'; 2597 I += 2; 2598 continue; 2599 // $n => number of arguments 2600 case 'n': 2601 OS << A.size(); 2602 I += 2; 2603 continue; 2604 default: { 2605 if (!isDigit(Body[I + 1])) 2606 break; 2607 // $[0-9] => argument 2608 // Missing arguments are ignored. 2609 unsigned Index = Body[I + 1] - '0'; 2610 if (Index < A.size()) 2611 for (const AsmToken &Token : A[Index]) 2612 OS << Token.getString(); 2613 I += 2; 2614 continue; 2615 } 2616 } 2617 } 2618 2619 if (!isIdentifierChar(Body[I]) || IsDarwin) { 2620 OS << Body[I++]; 2621 continue; 2622 } 2623 2624 const size_t Start = I; 2625 while (++I && isIdentifierChar(Body[I])) { 2626 } 2627 StringRef Token(Body.data() + Start, I - Start); 2628 if (AltMacroMode) { 2629 unsigned Index = 0; 2630 for (; Index != NParameters; ++Index) 2631 if (Parameters[Index].Name == Token) 2632 break; 2633 if (Index != NParameters) { 2634 expandArg(Index); 2635 if (I != End && Body[I] == '&') 2636 ++I; 2637 continue; 2638 } 2639 } 2640 OS << Token; 2641 } 2642 2643 ++Macro.Count; 2644 return false; 2645 } 2646 2647 static bool isOperator(AsmToken::TokenKind kind) { 2648 switch (kind) { 2649 default: 2650 return false; 2651 case AsmToken::Plus: 2652 case AsmToken::Minus: 2653 case AsmToken::Tilde: 2654 case AsmToken::Slash: 2655 case AsmToken::Star: 2656 case AsmToken::Dot: 2657 case AsmToken::Equal: 2658 case AsmToken::EqualEqual: 2659 case AsmToken::Pipe: 2660 case AsmToken::PipePipe: 2661 case AsmToken::Caret: 2662 case AsmToken::Amp: 2663 case AsmToken::AmpAmp: 2664 case AsmToken::Exclaim: 2665 case AsmToken::ExclaimEqual: 2666 case AsmToken::Less: 2667 case AsmToken::LessEqual: 2668 case AsmToken::LessLess: 2669 case AsmToken::LessGreater: 2670 case AsmToken::Greater: 2671 case AsmToken::GreaterEqual: 2672 case AsmToken::GreaterGreater: 2673 return true; 2674 } 2675 } 2676 2677 namespace { 2678 2679 class AsmLexerSkipSpaceRAII { 2680 public: 2681 AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) { 2682 Lexer.setSkipSpace(SkipSpace); 2683 } 2684 2685 ~AsmLexerSkipSpaceRAII() { 2686 Lexer.setSkipSpace(true); 2687 } 2688 2689 private: 2690 AsmLexer &Lexer; 2691 }; 2692 2693 } // end anonymous namespace 2694 2695 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) { 2696 2697 if (Vararg) { 2698 if (Lexer.isNot(AsmToken::EndOfStatement)) { 2699 StringRef Str = parseStringToEndOfStatement(); 2700 MA.emplace_back(AsmToken::String, Str); 2701 } 2702 return false; 2703 } 2704 2705 unsigned ParenLevel = 0; 2706 2707 // Darwin doesn't use spaces to delmit arguments. 2708 AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin); 2709 2710 bool SpaceEaten; 2711 2712 while (true) { 2713 SpaceEaten = false; 2714 if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal)) 2715 return TokError("unexpected token in macro instantiation"); 2716 2717 if (ParenLevel == 0) { 2718 2719 if (Lexer.is(AsmToken::Comma)) 2720 break; 2721 2722 if (parseOptionalToken(AsmToken::Space)) 2723 SpaceEaten = true; 2724 2725 // Spaces can delimit parameters, but could also be part an expression. 2726 // If the token after a space is an operator, add the token and the next 2727 // one into this argument 2728 if (!IsDarwin) { 2729 if (isOperator(Lexer.getKind())) { 2730 MA.push_back(getTok()); 2731 Lexer.Lex(); 2732 2733 // Whitespace after an operator can be ignored. 2734 parseOptionalToken(AsmToken::Space); 2735 continue; 2736 } 2737 } 2738 if (SpaceEaten) 2739 break; 2740 } 2741 2742 // handleMacroEntry relies on not advancing the lexer here 2743 // to be able to fill in the remaining default parameter values 2744 if (Lexer.is(AsmToken::EndOfStatement)) 2745 break; 2746 2747 // Adjust the current parentheses level. 2748 if (Lexer.is(AsmToken::LParen)) 2749 ++ParenLevel; 2750 else if (Lexer.is(AsmToken::RParen) && ParenLevel) 2751 --ParenLevel; 2752 2753 // Append the token to the current argument list. 2754 MA.push_back(getTok()); 2755 Lexer.Lex(); 2756 } 2757 2758 if (ParenLevel != 0) 2759 return TokError("unbalanced parentheses in macro argument"); 2760 return false; 2761 } 2762 2763 // Parse the macro instantiation arguments. 2764 bool AsmParser::parseMacroArguments(const MCAsmMacro *M, 2765 MCAsmMacroArguments &A) { 2766 const unsigned NParameters = M ? M->Parameters.size() : 0; 2767 bool NamedParametersFound = false; 2768 SmallVector<SMLoc, 4> FALocs; 2769 2770 A.resize(NParameters); 2771 FALocs.resize(NParameters); 2772 2773 // Parse two kinds of macro invocations: 2774 // - macros defined without any parameters accept an arbitrary number of them 2775 // - macros defined with parameters accept at most that many of them 2776 bool HasVararg = NParameters ? M->Parameters.back().Vararg : false; 2777 for (unsigned Parameter = 0; !NParameters || Parameter < NParameters; 2778 ++Parameter) { 2779 SMLoc IDLoc = Lexer.getLoc(); 2780 MCAsmMacroParameter FA; 2781 2782 if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) { 2783 if (parseIdentifier(FA.Name)) 2784 return Error(IDLoc, "invalid argument identifier for formal argument"); 2785 2786 if (Lexer.isNot(AsmToken::Equal)) 2787 return TokError("expected '=' after formal parameter identifier"); 2788 2789 Lex(); 2790 2791 NamedParametersFound = true; 2792 } 2793 bool Vararg = HasVararg && Parameter == (NParameters - 1); 2794 2795 if (NamedParametersFound && FA.Name.empty()) 2796 return Error(IDLoc, "cannot mix positional and keyword arguments"); 2797 2798 SMLoc StrLoc = Lexer.getLoc(); 2799 SMLoc EndLoc; 2800 if (AltMacroMode && Lexer.is(AsmToken::Percent)) { 2801 const MCExpr *AbsoluteExp; 2802 int64_t Value; 2803 /// Eat '%' 2804 Lex(); 2805 if (parseExpression(AbsoluteExp, EndLoc)) 2806 return false; 2807 if (!AbsoluteExp->evaluateAsAbsolute(Value, 2808 getStreamer().getAssemblerPtr())) 2809 return Error(StrLoc, "expected absolute expression"); 2810 const char *StrChar = StrLoc.getPointer(); 2811 const char *EndChar = EndLoc.getPointer(); 2812 AsmToken newToken(AsmToken::Integer, 2813 StringRef(StrChar, EndChar - StrChar), Value); 2814 FA.Value.push_back(newToken); 2815 } else if (AltMacroMode && Lexer.is(AsmToken::Less) && 2816 isAngleBracketString(StrLoc, EndLoc)) { 2817 const char *StrChar = StrLoc.getPointer(); 2818 const char *EndChar = EndLoc.getPointer(); 2819 jumpToLoc(EndLoc, CurBuffer); 2820 /// Eat from '<' to '>' 2821 Lex(); 2822 AsmToken newToken(AsmToken::String, 2823 StringRef(StrChar, EndChar - StrChar)); 2824 FA.Value.push_back(newToken); 2825 } else if(parseMacroArgument(FA.Value, Vararg)) 2826 return true; 2827 2828 unsigned PI = Parameter; 2829 if (!FA.Name.empty()) { 2830 unsigned FAI = 0; 2831 for (FAI = 0; FAI < NParameters; ++FAI) 2832 if (M->Parameters[FAI].Name == FA.Name) 2833 break; 2834 2835 if (FAI >= NParameters) { 2836 assert(M && "expected macro to be defined"); 2837 return Error(IDLoc, "parameter named '" + FA.Name + 2838 "' does not exist for macro '" + M->Name + "'"); 2839 } 2840 PI = FAI; 2841 } 2842 2843 if (!FA.Value.empty()) { 2844 if (A.size() <= PI) 2845 A.resize(PI + 1); 2846 A[PI] = FA.Value; 2847 2848 if (FALocs.size() <= PI) 2849 FALocs.resize(PI + 1); 2850 2851 FALocs[PI] = Lexer.getLoc(); 2852 } 2853 2854 // At the end of the statement, fill in remaining arguments that have 2855 // default values. If there aren't any, then the next argument is 2856 // required but missing 2857 if (Lexer.is(AsmToken::EndOfStatement)) { 2858 bool Failure = false; 2859 for (unsigned FAI = 0; FAI < NParameters; ++FAI) { 2860 if (A[FAI].empty()) { 2861 if (M->Parameters[FAI].Required) { 2862 Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(), 2863 "missing value for required parameter " 2864 "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'"); 2865 Failure = true; 2866 } 2867 2868 if (!M->Parameters[FAI].Value.empty()) 2869 A[FAI] = M->Parameters[FAI].Value; 2870 } 2871 } 2872 return Failure; 2873 } 2874 2875 parseOptionalToken(AsmToken::Comma); 2876 } 2877 2878 return TokError("too many positional arguments"); 2879 } 2880 2881 bool AsmParser::handleMacroEntry(MCAsmMacro *M, SMLoc NameLoc) { 2882 // Arbitrarily limit macro nesting depth (default matches 'as'). We can 2883 // eliminate this, although we should protect against infinite loops. 2884 unsigned MaxNestingDepth = AsmMacroMaxNestingDepth; 2885 if (ActiveMacros.size() == MaxNestingDepth) { 2886 std::ostringstream MaxNestingDepthError; 2887 MaxNestingDepthError << "macros cannot be nested more than " 2888 << MaxNestingDepth << " levels deep." 2889 << " Use -asm-macro-max-nesting-depth to increase " 2890 "this limit."; 2891 return TokError(MaxNestingDepthError.str()); 2892 } 2893 2894 MCAsmMacroArguments A; 2895 if (parseMacroArguments(M, A)) 2896 return true; 2897 2898 // Macro instantiation is lexical, unfortunately. We construct a new buffer 2899 // to hold the macro body with substitutions. 2900 SmallString<256> Buf; 2901 raw_svector_ostream OS(Buf); 2902 2903 if ((!IsDarwin || M->Parameters.size()) && M->Parameters.size() != A.size()) 2904 return Error(getTok().getLoc(), "Wrong number of arguments"); 2905 if (expandMacro(OS, *M, M->Parameters, A, true)) 2906 return true; 2907 2908 // We include the .endmacro in the buffer as our cue to exit the macro 2909 // instantiation. 2910 OS << ".endmacro\n"; 2911 2912 std::unique_ptr<MemoryBuffer> Instantiation = 2913 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 2914 2915 // Create the macro instantiation object and add to the current macro 2916 // instantiation stack. 2917 MacroInstantiation *MI = new MacroInstantiation{ 2918 NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()}; 2919 ActiveMacros.push_back(MI); 2920 2921 ++NumOfMacroInstantiations; 2922 2923 // Jump to the macro instantiation and prime the lexer. 2924 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 2925 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 2926 Lex(); 2927 2928 return false; 2929 } 2930 2931 void AsmParser::handleMacroExit() { 2932 // Jump to the EndOfStatement we should return to, and consume it. 2933 jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer); 2934 Lex(); 2935 // If .endm/.endr is followed by \n instead of a comment, consume it so that 2936 // we don't print an excess \n. 2937 if (getTok().is(AsmToken::EndOfStatement)) 2938 Lex(); 2939 2940 // Pop the instantiation entry. 2941 delete ActiveMacros.back(); 2942 ActiveMacros.pop_back(); 2943 } 2944 2945 bool AsmParser::parseAssignment(StringRef Name, AssignmentKind Kind) { 2946 MCSymbol *Sym; 2947 const MCExpr *Value; 2948 SMLoc ExprLoc = getTok().getLoc(); 2949 bool AllowRedef = 2950 Kind == AssignmentKind::Set || Kind == AssignmentKind::Equal; 2951 if (MCParserUtils::parseAssignmentExpression(Name, AllowRedef, *this, Sym, 2952 Value)) 2953 return true; 2954 2955 if (!Sym) { 2956 // In the case where we parse an expression starting with a '.', we will 2957 // not generate an error, nor will we create a symbol. In this case we 2958 // should just return out. 2959 return false; 2960 } 2961 2962 if (discardLTOSymbol(Name)) 2963 return false; 2964 2965 // Do the assignment. 2966 switch (Kind) { 2967 case AssignmentKind::Equal: 2968 Out.emitAssignment(Sym, Value); 2969 break; 2970 case AssignmentKind::Set: 2971 case AssignmentKind::Equiv: 2972 Out.emitAssignment(Sym, Value); 2973 Out.emitSymbolAttribute(Sym, MCSA_NoDeadStrip); 2974 break; 2975 case AssignmentKind::LTOSetConditional: 2976 if (Value->getKind() != MCExpr::SymbolRef) 2977 return Error(ExprLoc, "expected identifier"); 2978 2979 Out.emitConditionalAssignment(Sym, Value); 2980 break; 2981 } 2982 2983 return false; 2984 } 2985 2986 /// parseIdentifier: 2987 /// ::= identifier 2988 /// ::= string 2989 bool AsmParser::parseIdentifier(StringRef &Res) { 2990 // The assembler has relaxed rules for accepting identifiers, in particular we 2991 // allow things like '.globl $foo' and '.def @feat.00', which would normally be 2992 // separate tokens. At this level, we have already lexed so we cannot (currently) 2993 // handle this as a context dependent token, instead we detect adjacent tokens 2994 // and return the combined identifier. 2995 if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) { 2996 SMLoc PrefixLoc = getLexer().getLoc(); 2997 2998 // Consume the prefix character, and check for a following identifier. 2999 3000 AsmToken Buf[1]; 3001 Lexer.peekTokens(Buf, false); 3002 3003 if (Buf[0].isNot(AsmToken::Identifier) && Buf[0].isNot(AsmToken::Integer)) 3004 return true; 3005 3006 // We have a '$' or '@' followed by an identifier or integer token, make 3007 // sure they are adjacent. 3008 if (PrefixLoc.getPointer() + 1 != Buf[0].getLoc().getPointer()) 3009 return true; 3010 3011 // eat $ or @ 3012 Lexer.Lex(); // Lexer's Lex guarantees consecutive token. 3013 // Construct the joined identifier and consume the token. 3014 Res = StringRef(PrefixLoc.getPointer(), getTok().getString().size() + 1); 3015 Lex(); // Parser Lex to maintain invariants. 3016 return false; 3017 } 3018 3019 if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String)) 3020 return true; 3021 3022 Res = getTok().getIdentifier(); 3023 3024 Lex(); // Consume the identifier token. 3025 3026 return false; 3027 } 3028 3029 /// parseDirectiveSet: 3030 /// ::= .equ identifier ',' expression 3031 /// ::= .equiv identifier ',' expression 3032 /// ::= .set identifier ',' expression 3033 /// ::= .lto_set_conditional identifier ',' expression 3034 bool AsmParser::parseDirectiveSet(StringRef IDVal, AssignmentKind Kind) { 3035 StringRef Name; 3036 if (check(parseIdentifier(Name), "expected identifier") || parseComma() || 3037 parseAssignment(Name, Kind)) 3038 return true; 3039 return false; 3040 } 3041 3042 bool AsmParser::parseEscapedString(std::string &Data) { 3043 if (check(getTok().isNot(AsmToken::String), "expected string")) 3044 return true; 3045 3046 Data = ""; 3047 StringRef Str = getTok().getStringContents(); 3048 for (unsigned i = 0, e = Str.size(); i != e; ++i) { 3049 if (Str[i] != '\\') { 3050 if ((Str[i] == '\n') || (Str[i] == '\r')) { 3051 // Don't double-warn for Windows newlines. 3052 if ((Str[i] == '\n') && (i > 0) && (Str[i - 1] == '\r')) 3053 continue; 3054 3055 SMLoc NewlineLoc = SMLoc::getFromPointer(Str.data() + i); 3056 if (Warning(NewlineLoc, "unterminated string; newline inserted")) 3057 return true; 3058 } 3059 Data += Str[i]; 3060 continue; 3061 } 3062 3063 // Recognize escaped characters. Note that this escape semantics currently 3064 // loosely follows Darwin 'as'. 3065 ++i; 3066 if (i == e) 3067 return TokError("unexpected backslash at end of string"); 3068 3069 // Recognize hex sequences similarly to GNU 'as'. 3070 if (Str[i] == 'x' || Str[i] == 'X') { 3071 size_t length = Str.size(); 3072 if (i + 1 >= length || !isHexDigit(Str[i + 1])) 3073 return TokError("invalid hexadecimal escape sequence"); 3074 3075 // Consume hex characters. GNU 'as' reads all hexadecimal characters and 3076 // then truncates to the lower 16 bits. Seems reasonable. 3077 unsigned Value = 0; 3078 while (i + 1 < length && isHexDigit(Str[i + 1])) 3079 Value = Value * 16 + hexDigitValue(Str[++i]); 3080 3081 Data += (unsigned char)(Value & 0xFF); 3082 continue; 3083 } 3084 3085 // Recognize octal sequences. 3086 if ((unsigned)(Str[i] - '0') <= 7) { 3087 // Consume up to three octal characters. 3088 unsigned Value = Str[i] - '0'; 3089 3090 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 3091 ++i; 3092 Value = Value * 8 + (Str[i] - '0'); 3093 3094 if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) { 3095 ++i; 3096 Value = Value * 8 + (Str[i] - '0'); 3097 } 3098 } 3099 3100 if (Value > 255) 3101 return TokError("invalid octal escape sequence (out of range)"); 3102 3103 Data += (unsigned char)Value; 3104 continue; 3105 } 3106 3107 // Otherwise recognize individual escapes. 3108 switch (Str[i]) { 3109 default: 3110 // Just reject invalid escape sequences for now. 3111 return TokError("invalid escape sequence (unrecognized character)"); 3112 3113 case 'b': Data += '\b'; break; 3114 case 'f': Data += '\f'; break; 3115 case 'n': Data += '\n'; break; 3116 case 'r': Data += '\r'; break; 3117 case 't': Data += '\t'; break; 3118 case '"': Data += '"'; break; 3119 case '\\': Data += '\\'; break; 3120 } 3121 } 3122 3123 Lex(); 3124 return false; 3125 } 3126 3127 bool AsmParser::parseAngleBracketString(std::string &Data) { 3128 SMLoc EndLoc, StartLoc = getTok().getLoc(); 3129 if (isAngleBracketString(StartLoc, EndLoc)) { 3130 const char *StartChar = StartLoc.getPointer() + 1; 3131 const char *EndChar = EndLoc.getPointer() - 1; 3132 jumpToLoc(EndLoc, CurBuffer); 3133 /// Eat from '<' to '>' 3134 Lex(); 3135 3136 Data = angleBracketString(StringRef(StartChar, EndChar - StartChar)); 3137 return false; 3138 } 3139 return true; 3140 } 3141 3142 /// parseDirectiveAscii: 3143 // ::= .ascii [ "string"+ ( , "string"+ )* ] 3144 /// ::= ( .asciz | .string ) [ "string" ( , "string" )* ] 3145 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) { 3146 auto parseOp = [&]() -> bool { 3147 std::string Data; 3148 if (checkForValidSection()) 3149 return true; 3150 // Only support spaces as separators for .ascii directive for now. See the 3151 // discusssion at https://reviews.llvm.org/D91460 for more details. 3152 do { 3153 if (parseEscapedString(Data)) 3154 return true; 3155 getStreamer().emitBytes(Data); 3156 } while (!ZeroTerminated && getTok().is(AsmToken::String)); 3157 if (ZeroTerminated) 3158 getStreamer().emitBytes(StringRef("\0", 1)); 3159 return false; 3160 }; 3161 3162 return parseMany(parseOp); 3163 } 3164 3165 /// parseDirectiveReloc 3166 /// ::= .reloc expression , identifier [ , expression ] 3167 bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) { 3168 const MCExpr *Offset; 3169 const MCExpr *Expr = nullptr; 3170 SMLoc OffsetLoc = Lexer.getTok().getLoc(); 3171 3172 if (parseExpression(Offset)) 3173 return true; 3174 if (parseComma() || 3175 check(getTok().isNot(AsmToken::Identifier), "expected relocation name")) 3176 return true; 3177 3178 SMLoc NameLoc = Lexer.getTok().getLoc(); 3179 StringRef Name = Lexer.getTok().getIdentifier(); 3180 Lex(); 3181 3182 if (Lexer.is(AsmToken::Comma)) { 3183 Lex(); 3184 SMLoc ExprLoc = Lexer.getLoc(); 3185 if (parseExpression(Expr)) 3186 return true; 3187 3188 MCValue Value; 3189 if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr)) 3190 return Error(ExprLoc, "expression must be relocatable"); 3191 } 3192 3193 if (parseEOL()) 3194 return true; 3195 3196 const MCTargetAsmParser &MCT = getTargetParser(); 3197 const MCSubtargetInfo &STI = MCT.getSTI(); 3198 if (std::optional<std::pair<bool, std::string>> Err = 3199 getStreamer().emitRelocDirective(*Offset, Name, Expr, DirectiveLoc, 3200 STI)) 3201 return Error(Err->first ? NameLoc : OffsetLoc, Err->second); 3202 3203 return false; 3204 } 3205 3206 /// parseDirectiveValue 3207 /// ::= (.byte | .short | ... ) [ expression (, expression)* ] 3208 bool AsmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) { 3209 auto parseOp = [&]() -> bool { 3210 const MCExpr *Value; 3211 SMLoc ExprLoc = getLexer().getLoc(); 3212 if (checkForValidSection() || parseExpression(Value)) 3213 return true; 3214 // Special case constant expressions to match code generator. 3215 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3216 assert(Size <= 8 && "Invalid size"); 3217 uint64_t IntValue = MCE->getValue(); 3218 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 3219 return Error(ExprLoc, "out of range literal value"); 3220 getStreamer().emitIntValue(IntValue, Size); 3221 } else 3222 getStreamer().emitValue(Value, Size, ExprLoc); 3223 return false; 3224 }; 3225 3226 return parseMany(parseOp); 3227 } 3228 3229 static bool parseHexOcta(AsmParser &Asm, uint64_t &hi, uint64_t &lo) { 3230 if (Asm.getTok().isNot(AsmToken::Integer) && 3231 Asm.getTok().isNot(AsmToken::BigNum)) 3232 return Asm.TokError("unknown token in expression"); 3233 SMLoc ExprLoc = Asm.getTok().getLoc(); 3234 APInt IntValue = Asm.getTok().getAPIntVal(); 3235 Asm.Lex(); 3236 if (!IntValue.isIntN(128)) 3237 return Asm.Error(ExprLoc, "out of range literal value"); 3238 if (!IntValue.isIntN(64)) { 3239 hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue(); 3240 lo = IntValue.getLoBits(64).getZExtValue(); 3241 } else { 3242 hi = 0; 3243 lo = IntValue.getZExtValue(); 3244 } 3245 return false; 3246 } 3247 3248 /// ParseDirectiveOctaValue 3249 /// ::= .octa [ hexconstant (, hexconstant)* ] 3250 3251 bool AsmParser::parseDirectiveOctaValue(StringRef IDVal) { 3252 auto parseOp = [&]() -> bool { 3253 if (checkForValidSection()) 3254 return true; 3255 uint64_t hi, lo; 3256 if (parseHexOcta(*this, hi, lo)) 3257 return true; 3258 if (MAI.isLittleEndian()) { 3259 getStreamer().emitInt64(lo); 3260 getStreamer().emitInt64(hi); 3261 } else { 3262 getStreamer().emitInt64(hi); 3263 getStreamer().emitInt64(lo); 3264 } 3265 return false; 3266 }; 3267 3268 return parseMany(parseOp); 3269 } 3270 3271 bool AsmParser::parseRealValue(const fltSemantics &Semantics, APInt &Res) { 3272 // We don't truly support arithmetic on floating point expressions, so we 3273 // have to manually parse unary prefixes. 3274 bool IsNeg = false; 3275 if (getLexer().is(AsmToken::Minus)) { 3276 Lexer.Lex(); 3277 IsNeg = true; 3278 } else if (getLexer().is(AsmToken::Plus)) 3279 Lexer.Lex(); 3280 3281 if (Lexer.is(AsmToken::Error)) 3282 return TokError(Lexer.getErr()); 3283 if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) && 3284 Lexer.isNot(AsmToken::Identifier)) 3285 return TokError("unexpected token in directive"); 3286 3287 // Convert to an APFloat. 3288 APFloat Value(Semantics); 3289 StringRef IDVal = getTok().getString(); 3290 if (getLexer().is(AsmToken::Identifier)) { 3291 if (!IDVal.compare_insensitive("infinity") || 3292 !IDVal.compare_insensitive("inf")) 3293 Value = APFloat::getInf(Semantics); 3294 else if (!IDVal.compare_insensitive("nan")) 3295 Value = APFloat::getNaN(Semantics, false, ~0); 3296 else 3297 return TokError("invalid floating point literal"); 3298 } else if (errorToBool( 3299 Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) 3300 .takeError())) 3301 return TokError("invalid floating point literal"); 3302 if (IsNeg) 3303 Value.changeSign(); 3304 3305 // Consume the numeric token. 3306 Lex(); 3307 3308 Res = Value.bitcastToAPInt(); 3309 3310 return false; 3311 } 3312 3313 /// parseDirectiveRealValue 3314 /// ::= (.single | .double) [ expression (, expression)* ] 3315 bool AsmParser::parseDirectiveRealValue(StringRef IDVal, 3316 const fltSemantics &Semantics) { 3317 auto parseOp = [&]() -> bool { 3318 APInt AsInt; 3319 if (checkForValidSection() || parseRealValue(Semantics, AsInt)) 3320 return true; 3321 getStreamer().emitIntValue(AsInt.getLimitedValue(), 3322 AsInt.getBitWidth() / 8); 3323 return false; 3324 }; 3325 3326 return parseMany(parseOp); 3327 } 3328 3329 /// parseDirectiveZero 3330 /// ::= .zero expression 3331 bool AsmParser::parseDirectiveZero() { 3332 SMLoc NumBytesLoc = Lexer.getLoc(); 3333 const MCExpr *NumBytes; 3334 if (checkForValidSection() || parseExpression(NumBytes)) 3335 return true; 3336 3337 int64_t Val = 0; 3338 if (getLexer().is(AsmToken::Comma)) { 3339 Lex(); 3340 if (parseAbsoluteExpression(Val)) 3341 return true; 3342 } 3343 3344 if (parseEOL()) 3345 return true; 3346 getStreamer().emitFill(*NumBytes, Val, NumBytesLoc); 3347 3348 return false; 3349 } 3350 3351 /// parseDirectiveFill 3352 /// ::= .fill expression [ , expression [ , expression ] ] 3353 bool AsmParser::parseDirectiveFill() { 3354 SMLoc NumValuesLoc = Lexer.getLoc(); 3355 const MCExpr *NumValues; 3356 if (checkForValidSection() || parseExpression(NumValues)) 3357 return true; 3358 3359 int64_t FillSize = 1; 3360 int64_t FillExpr = 0; 3361 3362 SMLoc SizeLoc, ExprLoc; 3363 3364 if (parseOptionalToken(AsmToken::Comma)) { 3365 SizeLoc = getTok().getLoc(); 3366 if (parseAbsoluteExpression(FillSize)) 3367 return true; 3368 if (parseOptionalToken(AsmToken::Comma)) { 3369 ExprLoc = getTok().getLoc(); 3370 if (parseAbsoluteExpression(FillExpr)) 3371 return true; 3372 } 3373 } 3374 if (parseEOL()) 3375 return true; 3376 3377 if (FillSize < 0) { 3378 Warning(SizeLoc, "'.fill' directive with negative size has no effect"); 3379 return false; 3380 } 3381 if (FillSize > 8) { 3382 Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8"); 3383 FillSize = 8; 3384 } 3385 3386 if (!isUInt<32>(FillExpr) && FillSize > 4) 3387 Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits"); 3388 3389 getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc); 3390 3391 return false; 3392 } 3393 3394 /// parseDirectiveOrg 3395 /// ::= .org expression [ , expression ] 3396 bool AsmParser::parseDirectiveOrg() { 3397 const MCExpr *Offset; 3398 SMLoc OffsetLoc = Lexer.getLoc(); 3399 if (checkForValidSection() || parseExpression(Offset)) 3400 return true; 3401 3402 // Parse optional fill expression. 3403 int64_t FillExpr = 0; 3404 if (parseOptionalToken(AsmToken::Comma)) 3405 if (parseAbsoluteExpression(FillExpr)) 3406 return true; 3407 if (parseEOL()) 3408 return true; 3409 3410 getStreamer().emitValueToOffset(Offset, FillExpr, OffsetLoc); 3411 return false; 3412 } 3413 3414 /// parseDirectiveAlign 3415 /// ::= {.align, ...} expression [ , expression [ , expression ]] 3416 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) { 3417 SMLoc AlignmentLoc = getLexer().getLoc(); 3418 int64_t Alignment; 3419 SMLoc MaxBytesLoc; 3420 bool HasFillExpr = false; 3421 int64_t FillExpr = 0; 3422 int64_t MaxBytesToFill = 0; 3423 SMLoc FillExprLoc; 3424 3425 auto parseAlign = [&]() -> bool { 3426 if (parseAbsoluteExpression(Alignment)) 3427 return true; 3428 if (parseOptionalToken(AsmToken::Comma)) { 3429 // The fill expression can be omitted while specifying a maximum number of 3430 // alignment bytes, e.g: 3431 // .align 3,,4 3432 if (getTok().isNot(AsmToken::Comma)) { 3433 HasFillExpr = true; 3434 if (parseTokenLoc(FillExprLoc) || parseAbsoluteExpression(FillExpr)) 3435 return true; 3436 } 3437 if (parseOptionalToken(AsmToken::Comma)) 3438 if (parseTokenLoc(MaxBytesLoc) || 3439 parseAbsoluteExpression(MaxBytesToFill)) 3440 return true; 3441 } 3442 return parseEOL(); 3443 }; 3444 3445 if (checkForValidSection()) 3446 return true; 3447 // Ignore empty '.p2align' directives for GNU-as compatibility 3448 if (IsPow2 && (ValueSize == 1) && getTok().is(AsmToken::EndOfStatement)) { 3449 Warning(AlignmentLoc, "p2align directive with no operand(s) is ignored"); 3450 return parseEOL(); 3451 } 3452 if (parseAlign()) 3453 return true; 3454 3455 // Always emit an alignment here even if we thrown an error. 3456 bool ReturnVal = false; 3457 3458 // Compute alignment in bytes. 3459 if (IsPow2) { 3460 // FIXME: Diagnose overflow. 3461 if (Alignment >= 32) { 3462 ReturnVal |= Error(AlignmentLoc, "invalid alignment value"); 3463 Alignment = 31; 3464 } 3465 3466 Alignment = 1ULL << Alignment; 3467 } else { 3468 // Reject alignments that aren't either a power of two or zero, 3469 // for gas compatibility. Alignment of zero is silently rounded 3470 // up to one. 3471 if (Alignment == 0) 3472 Alignment = 1; 3473 else if (!isPowerOf2_64(Alignment)) { 3474 ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2"); 3475 Alignment = llvm::bit_floor<uint64_t>(Alignment); 3476 } 3477 if (!isUInt<32>(Alignment)) { 3478 ReturnVal |= Error(AlignmentLoc, "alignment must be smaller than 2**32"); 3479 Alignment = 1u << 31; 3480 } 3481 } 3482 3483 // Diagnose non-sensical max bytes to align. 3484 if (MaxBytesLoc.isValid()) { 3485 if (MaxBytesToFill < 1) { 3486 ReturnVal |= Error(MaxBytesLoc, 3487 "alignment directive can never be satisfied in this " 3488 "many bytes, ignoring maximum bytes expression"); 3489 MaxBytesToFill = 0; 3490 } 3491 3492 if (MaxBytesToFill >= Alignment) { 3493 Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and " 3494 "has no effect"); 3495 MaxBytesToFill = 0; 3496 } 3497 } 3498 3499 const MCSection *Section = getStreamer().getCurrentSectionOnly(); 3500 assert(Section && "must have section to emit alignment"); 3501 3502 if (HasFillExpr && FillExpr != 0 && Section->isVirtualSection()) { 3503 ReturnVal |= 3504 Warning(FillExprLoc, "ignoring non-zero fill value in " + 3505 Section->getVirtualSectionKind() + 3506 " section '" + Section->getName() + "'"); 3507 FillExpr = 0; 3508 } 3509 3510 // Check whether we should use optimal code alignment for this .align 3511 // directive. 3512 if (Section->useCodeAlign() && !HasFillExpr) { 3513 getStreamer().emitCodeAlignment( 3514 Align(Alignment), &getTargetParser().getSTI(), MaxBytesToFill); 3515 } else { 3516 // FIXME: Target specific behavior about how the "extra" bytes are filled. 3517 getStreamer().emitValueToAlignment(Align(Alignment), FillExpr, ValueSize, 3518 MaxBytesToFill); 3519 } 3520 3521 return ReturnVal; 3522 } 3523 3524 /// parseDirectiveFile 3525 /// ::= .file filename 3526 /// ::= .file number [directory] filename [md5 checksum] [source source-text] 3527 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) { 3528 // FIXME: I'm not sure what this is. 3529 int64_t FileNumber = -1; 3530 if (getLexer().is(AsmToken::Integer)) { 3531 FileNumber = getTok().getIntVal(); 3532 Lex(); 3533 3534 if (FileNumber < 0) 3535 return TokError("negative file number"); 3536 } 3537 3538 std::string Path; 3539 3540 // Usually the directory and filename together, otherwise just the directory. 3541 // Allow the strings to have escaped octal character sequence. 3542 if (parseEscapedString(Path)) 3543 return true; 3544 3545 StringRef Directory; 3546 StringRef Filename; 3547 std::string FilenameData; 3548 if (getLexer().is(AsmToken::String)) { 3549 if (check(FileNumber == -1, 3550 "explicit path specified, but no file number") || 3551 parseEscapedString(FilenameData)) 3552 return true; 3553 Filename = FilenameData; 3554 Directory = Path; 3555 } else { 3556 Filename = Path; 3557 } 3558 3559 uint64_t MD5Hi, MD5Lo; 3560 bool HasMD5 = false; 3561 3562 std::optional<StringRef> Source; 3563 bool HasSource = false; 3564 std::string SourceString; 3565 3566 while (!parseOptionalToken(AsmToken::EndOfStatement)) { 3567 StringRef Keyword; 3568 if (check(getTok().isNot(AsmToken::Identifier), 3569 "unexpected token in '.file' directive") || 3570 parseIdentifier(Keyword)) 3571 return true; 3572 if (Keyword == "md5") { 3573 HasMD5 = true; 3574 if (check(FileNumber == -1, 3575 "MD5 checksum specified, but no file number") || 3576 parseHexOcta(*this, MD5Hi, MD5Lo)) 3577 return true; 3578 } else if (Keyword == "source") { 3579 HasSource = true; 3580 if (check(FileNumber == -1, 3581 "source specified, but no file number") || 3582 check(getTok().isNot(AsmToken::String), 3583 "unexpected token in '.file' directive") || 3584 parseEscapedString(SourceString)) 3585 return true; 3586 } else { 3587 return TokError("unexpected token in '.file' directive"); 3588 } 3589 } 3590 3591 if (FileNumber == -1) { 3592 // Ignore the directive if there is no number and the target doesn't support 3593 // numberless .file directives. This allows some portability of assembler 3594 // between different object file formats. 3595 if (getContext().getAsmInfo()->hasSingleParameterDotFile()) 3596 getStreamer().emitFileDirective(Filename); 3597 } else { 3598 // In case there is a -g option as well as debug info from directive .file, 3599 // we turn off the -g option, directly use the existing debug info instead. 3600 // Throw away any implicit file table for the assembler source. 3601 if (Ctx.getGenDwarfForAssembly()) { 3602 Ctx.getMCDwarfLineTable(0).resetFileTable(); 3603 Ctx.setGenDwarfForAssembly(false); 3604 } 3605 3606 std::optional<MD5::MD5Result> CKMem; 3607 if (HasMD5) { 3608 MD5::MD5Result Sum; 3609 for (unsigned i = 0; i != 8; ++i) { 3610 Sum[i] = uint8_t(MD5Hi >> ((7 - i) * 8)); 3611 Sum[i + 8] = uint8_t(MD5Lo >> ((7 - i) * 8)); 3612 } 3613 CKMem = Sum; 3614 } 3615 if (HasSource) { 3616 char *SourceBuf = static_cast<char *>(Ctx.allocate(SourceString.size())); 3617 memcpy(SourceBuf, SourceString.data(), SourceString.size()); 3618 Source = StringRef(SourceBuf, SourceString.size()); 3619 } 3620 if (FileNumber == 0) { 3621 // Upgrade to Version 5 for assembly actions like clang -c a.s. 3622 if (Ctx.getDwarfVersion() < 5) 3623 Ctx.setDwarfVersion(5); 3624 getStreamer().emitDwarfFile0Directive(Directory, Filename, CKMem, Source); 3625 } else { 3626 Expected<unsigned> FileNumOrErr = getStreamer().tryEmitDwarfFileDirective( 3627 FileNumber, Directory, Filename, CKMem, Source); 3628 if (!FileNumOrErr) 3629 return Error(DirectiveLoc, toString(FileNumOrErr.takeError())); 3630 } 3631 // Alert the user if there are some .file directives with MD5 and some not. 3632 // But only do that once. 3633 if (!ReportedInconsistentMD5 && !Ctx.isDwarfMD5UsageConsistent(0)) { 3634 ReportedInconsistentMD5 = true; 3635 return Warning(DirectiveLoc, "inconsistent use of MD5 checksums"); 3636 } 3637 } 3638 3639 return false; 3640 } 3641 3642 /// parseDirectiveLine 3643 /// ::= .line [number] 3644 bool AsmParser::parseDirectiveLine() { 3645 int64_t LineNumber; 3646 if (getLexer().is(AsmToken::Integer)) { 3647 if (parseIntToken(LineNumber, "unexpected token in '.line' directive")) 3648 return true; 3649 (void)LineNumber; 3650 // FIXME: Do something with the .line. 3651 } 3652 return parseEOL(); 3653 } 3654 3655 /// parseDirectiveLoc 3656 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end] 3657 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE] 3658 /// The first number is a file number, must have been previously assigned with 3659 /// a .file directive, the second number is the line number and optionally the 3660 /// third number is a column position (zero if not specified). The remaining 3661 /// optional items are .loc sub-directives. 3662 bool AsmParser::parseDirectiveLoc() { 3663 int64_t FileNumber = 0, LineNumber = 0; 3664 SMLoc Loc = getTok().getLoc(); 3665 if (parseIntToken(FileNumber, "unexpected token in '.loc' directive") || 3666 check(FileNumber < 1 && Ctx.getDwarfVersion() < 5, Loc, 3667 "file number less than one in '.loc' directive") || 3668 check(!getContext().isValidDwarfFileNumber(FileNumber), Loc, 3669 "unassigned file number in '.loc' directive")) 3670 return true; 3671 3672 // optional 3673 if (getLexer().is(AsmToken::Integer)) { 3674 LineNumber = getTok().getIntVal(); 3675 if (LineNumber < 0) 3676 return TokError("line number less than zero in '.loc' directive"); 3677 Lex(); 3678 } 3679 3680 int64_t ColumnPos = 0; 3681 if (getLexer().is(AsmToken::Integer)) { 3682 ColumnPos = getTok().getIntVal(); 3683 if (ColumnPos < 0) 3684 return TokError("column position less than zero in '.loc' directive"); 3685 Lex(); 3686 } 3687 3688 auto PrevFlags = getContext().getCurrentDwarfLoc().getFlags(); 3689 unsigned Flags = PrevFlags & DWARF2_FLAG_IS_STMT; 3690 unsigned Isa = 0; 3691 int64_t Discriminator = 0; 3692 3693 auto parseLocOp = [&]() -> bool { 3694 StringRef Name; 3695 SMLoc Loc = getTok().getLoc(); 3696 if (parseIdentifier(Name)) 3697 return TokError("unexpected token in '.loc' directive"); 3698 3699 if (Name == "basic_block") 3700 Flags |= DWARF2_FLAG_BASIC_BLOCK; 3701 else if (Name == "prologue_end") 3702 Flags |= DWARF2_FLAG_PROLOGUE_END; 3703 else if (Name == "epilogue_begin") 3704 Flags |= DWARF2_FLAG_EPILOGUE_BEGIN; 3705 else if (Name == "is_stmt") { 3706 Loc = getTok().getLoc(); 3707 const MCExpr *Value; 3708 if (parseExpression(Value)) 3709 return true; 3710 // The expression must be the constant 0 or 1. 3711 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3712 int Value = MCE->getValue(); 3713 if (Value == 0) 3714 Flags &= ~DWARF2_FLAG_IS_STMT; 3715 else if (Value == 1) 3716 Flags |= DWARF2_FLAG_IS_STMT; 3717 else 3718 return Error(Loc, "is_stmt value not 0 or 1"); 3719 } else { 3720 return Error(Loc, "is_stmt value not the constant value of 0 or 1"); 3721 } 3722 } else if (Name == "isa") { 3723 Loc = getTok().getLoc(); 3724 const MCExpr *Value; 3725 if (parseExpression(Value)) 3726 return true; 3727 // The expression must be a constant greater or equal to 0. 3728 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 3729 int Value = MCE->getValue(); 3730 if (Value < 0) 3731 return Error(Loc, "isa number less than zero"); 3732 Isa = Value; 3733 } else { 3734 return Error(Loc, "isa number not a constant value"); 3735 } 3736 } else if (Name == "discriminator") { 3737 if (parseAbsoluteExpression(Discriminator)) 3738 return true; 3739 } else { 3740 return Error(Loc, "unknown sub-directive in '.loc' directive"); 3741 } 3742 return false; 3743 }; 3744 3745 if (parseMany(parseLocOp, false /*hasComma*/)) 3746 return true; 3747 3748 getStreamer().emitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags, 3749 Isa, Discriminator, StringRef()); 3750 3751 return false; 3752 } 3753 3754 /// parseDirectiveLoc 3755 /// ::= .loc_label label 3756 bool AsmParser::parseDirectiveLocLabel(SMLoc DirectiveLoc) { 3757 StringRef Name; 3758 DirectiveLoc = Lexer.getLoc(); 3759 if (parseIdentifier(Name)) 3760 return TokError("expected identifier"); 3761 if (parseEOL()) 3762 return true; 3763 getStreamer().emitDwarfLocLabelDirective(DirectiveLoc, Name); 3764 return false; 3765 } 3766 3767 /// parseDirectiveStabs 3768 /// ::= .stabs string, number, number, number 3769 bool AsmParser::parseDirectiveStabs() { 3770 return TokError("unsupported directive '.stabs'"); 3771 } 3772 3773 /// parseDirectiveCVFile 3774 /// ::= .cv_file number filename [checksum] [checksumkind] 3775 bool AsmParser::parseDirectiveCVFile() { 3776 SMLoc FileNumberLoc = getTok().getLoc(); 3777 int64_t FileNumber; 3778 std::string Filename; 3779 std::string Checksum; 3780 int64_t ChecksumKind = 0; 3781 3782 if (parseIntToken(FileNumber, 3783 "expected file number in '.cv_file' directive") || 3784 check(FileNumber < 1, FileNumberLoc, "file number less than one") || 3785 check(getTok().isNot(AsmToken::String), 3786 "unexpected token in '.cv_file' directive") || 3787 parseEscapedString(Filename)) 3788 return true; 3789 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 3790 if (check(getTok().isNot(AsmToken::String), 3791 "unexpected token in '.cv_file' directive") || 3792 parseEscapedString(Checksum) || 3793 parseIntToken(ChecksumKind, 3794 "expected checksum kind in '.cv_file' directive") || 3795 parseEOL()) 3796 return true; 3797 } 3798 3799 Checksum = fromHex(Checksum); 3800 void *CKMem = Ctx.allocate(Checksum.size(), 1); 3801 memcpy(CKMem, Checksum.data(), Checksum.size()); 3802 ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem), 3803 Checksum.size()); 3804 3805 if (!getStreamer().emitCVFileDirective(FileNumber, Filename, ChecksumAsBytes, 3806 static_cast<uint8_t>(ChecksumKind))) 3807 return Error(FileNumberLoc, "file number already allocated"); 3808 3809 return false; 3810 } 3811 3812 bool AsmParser::parseCVFunctionId(int64_t &FunctionId, 3813 StringRef DirectiveName) { 3814 SMLoc Loc; 3815 return parseTokenLoc(Loc) || 3816 parseIntToken(FunctionId, "expected function id in '" + DirectiveName + 3817 "' directive") || 3818 check(FunctionId < 0 || FunctionId >= UINT_MAX, Loc, 3819 "expected function id within range [0, UINT_MAX)"); 3820 } 3821 3822 bool AsmParser::parseCVFileId(int64_t &FileNumber, StringRef DirectiveName) { 3823 SMLoc Loc; 3824 return parseTokenLoc(Loc) || 3825 parseIntToken(FileNumber, "expected integer in '" + DirectiveName + 3826 "' directive") || 3827 check(FileNumber < 1, Loc, "file number less than one in '" + 3828 DirectiveName + "' directive") || 3829 check(!getCVContext().isValidFileNumber(FileNumber), Loc, 3830 "unassigned file number in '" + DirectiveName + "' directive"); 3831 } 3832 3833 /// parseDirectiveCVFuncId 3834 /// ::= .cv_func_id FunctionId 3835 /// 3836 /// Introduces a function ID that can be used with .cv_loc. 3837 bool AsmParser::parseDirectiveCVFuncId() { 3838 SMLoc FunctionIdLoc = getTok().getLoc(); 3839 int64_t FunctionId; 3840 3841 if (parseCVFunctionId(FunctionId, ".cv_func_id") || parseEOL()) 3842 return true; 3843 3844 if (!getStreamer().emitCVFuncIdDirective(FunctionId)) 3845 return Error(FunctionIdLoc, "function id already allocated"); 3846 3847 return false; 3848 } 3849 3850 /// parseDirectiveCVInlineSiteId 3851 /// ::= .cv_inline_site_id FunctionId 3852 /// "within" IAFunc 3853 /// "inlined_at" IAFile IALine [IACol] 3854 /// 3855 /// Introduces a function ID that can be used with .cv_loc. Includes "inlined 3856 /// at" source location information for use in the line table of the caller, 3857 /// whether the caller is a real function or another inlined call site. 3858 bool AsmParser::parseDirectiveCVInlineSiteId() { 3859 SMLoc FunctionIdLoc = getTok().getLoc(); 3860 int64_t FunctionId; 3861 int64_t IAFunc; 3862 int64_t IAFile; 3863 int64_t IALine; 3864 int64_t IACol = 0; 3865 3866 // FunctionId 3867 if (parseCVFunctionId(FunctionId, ".cv_inline_site_id")) 3868 return true; 3869 3870 // "within" 3871 if (check((getLexer().isNot(AsmToken::Identifier) || 3872 getTok().getIdentifier() != "within"), 3873 "expected 'within' identifier in '.cv_inline_site_id' directive")) 3874 return true; 3875 Lex(); 3876 3877 // IAFunc 3878 if (parseCVFunctionId(IAFunc, ".cv_inline_site_id")) 3879 return true; 3880 3881 // "inlined_at" 3882 if (check((getLexer().isNot(AsmToken::Identifier) || 3883 getTok().getIdentifier() != "inlined_at"), 3884 "expected 'inlined_at' identifier in '.cv_inline_site_id' " 3885 "directive") ) 3886 return true; 3887 Lex(); 3888 3889 // IAFile IALine 3890 if (parseCVFileId(IAFile, ".cv_inline_site_id") || 3891 parseIntToken(IALine, "expected line number after 'inlined_at'")) 3892 return true; 3893 3894 // [IACol] 3895 if (getLexer().is(AsmToken::Integer)) { 3896 IACol = getTok().getIntVal(); 3897 Lex(); 3898 } 3899 3900 if (parseEOL()) 3901 return true; 3902 3903 if (!getStreamer().emitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile, 3904 IALine, IACol, FunctionIdLoc)) 3905 return Error(FunctionIdLoc, "function id already allocated"); 3906 3907 return false; 3908 } 3909 3910 /// parseDirectiveCVLoc 3911 /// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end] 3912 /// [is_stmt VALUE] 3913 /// The first number is a file number, must have been previously assigned with 3914 /// a .file directive, the second number is the line number and optionally the 3915 /// third number is a column position (zero if not specified). The remaining 3916 /// optional items are .loc sub-directives. 3917 bool AsmParser::parseDirectiveCVLoc() { 3918 SMLoc DirectiveLoc = getTok().getLoc(); 3919 int64_t FunctionId, FileNumber; 3920 if (parseCVFunctionId(FunctionId, ".cv_loc") || 3921 parseCVFileId(FileNumber, ".cv_loc")) 3922 return true; 3923 3924 int64_t LineNumber = 0; 3925 if (getLexer().is(AsmToken::Integer)) { 3926 LineNumber = getTok().getIntVal(); 3927 if (LineNumber < 0) 3928 return TokError("line number less than zero in '.cv_loc' directive"); 3929 Lex(); 3930 } 3931 3932 int64_t ColumnPos = 0; 3933 if (getLexer().is(AsmToken::Integer)) { 3934 ColumnPos = getTok().getIntVal(); 3935 if (ColumnPos < 0) 3936 return TokError("column position less than zero in '.cv_loc' directive"); 3937 Lex(); 3938 } 3939 3940 bool PrologueEnd = false; 3941 uint64_t IsStmt = 0; 3942 3943 auto parseOp = [&]() -> bool { 3944 StringRef Name; 3945 SMLoc Loc = getTok().getLoc(); 3946 if (parseIdentifier(Name)) 3947 return TokError("unexpected token in '.cv_loc' directive"); 3948 if (Name == "prologue_end") 3949 PrologueEnd = true; 3950 else if (Name == "is_stmt") { 3951 Loc = getTok().getLoc(); 3952 const MCExpr *Value; 3953 if (parseExpression(Value)) 3954 return true; 3955 // The expression must be the constant 0 or 1. 3956 IsStmt = ~0ULL; 3957 if (const auto *MCE = dyn_cast<MCConstantExpr>(Value)) 3958 IsStmt = MCE->getValue(); 3959 3960 if (IsStmt > 1) 3961 return Error(Loc, "is_stmt value not 0 or 1"); 3962 } else { 3963 return Error(Loc, "unknown sub-directive in '.cv_loc' directive"); 3964 } 3965 return false; 3966 }; 3967 3968 if (parseMany(parseOp, false /*hasComma*/)) 3969 return true; 3970 3971 getStreamer().emitCVLocDirective(FunctionId, FileNumber, LineNumber, 3972 ColumnPos, PrologueEnd, IsStmt, StringRef(), 3973 DirectiveLoc); 3974 return false; 3975 } 3976 3977 /// parseDirectiveCVLinetable 3978 /// ::= .cv_linetable FunctionId, FnStart, FnEnd 3979 bool AsmParser::parseDirectiveCVLinetable() { 3980 int64_t FunctionId; 3981 StringRef FnStartName, FnEndName; 3982 SMLoc Loc = getTok().getLoc(); 3983 if (parseCVFunctionId(FunctionId, ".cv_linetable") || parseComma() || 3984 parseTokenLoc(Loc) || 3985 check(parseIdentifier(FnStartName), Loc, 3986 "expected identifier in directive") || 3987 parseComma() || parseTokenLoc(Loc) || 3988 check(parseIdentifier(FnEndName), Loc, 3989 "expected identifier in directive")) 3990 return true; 3991 3992 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 3993 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 3994 3995 getStreamer().emitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym); 3996 return false; 3997 } 3998 3999 /// parseDirectiveCVInlineLinetable 4000 /// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd 4001 bool AsmParser::parseDirectiveCVInlineLinetable() { 4002 int64_t PrimaryFunctionId, SourceFileId, SourceLineNum; 4003 StringRef FnStartName, FnEndName; 4004 SMLoc Loc = getTok().getLoc(); 4005 if (parseCVFunctionId(PrimaryFunctionId, ".cv_inline_linetable") || 4006 parseTokenLoc(Loc) || 4007 parseIntToken( 4008 SourceFileId, 4009 "expected SourceField in '.cv_inline_linetable' directive") || 4010 check(SourceFileId <= 0, Loc, 4011 "File id less than zero in '.cv_inline_linetable' directive") || 4012 parseTokenLoc(Loc) || 4013 parseIntToken( 4014 SourceLineNum, 4015 "expected SourceLineNum in '.cv_inline_linetable' directive") || 4016 check(SourceLineNum < 0, Loc, 4017 "Line number less than zero in '.cv_inline_linetable' directive") || 4018 parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc, 4019 "expected identifier in directive") || 4020 parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc, 4021 "expected identifier in directive")) 4022 return true; 4023 4024 if (parseEOL()) 4025 return true; 4026 4027 MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName); 4028 MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName); 4029 getStreamer().emitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId, 4030 SourceLineNum, FnStartSym, 4031 FnEndSym); 4032 return false; 4033 } 4034 4035 void AsmParser::initializeCVDefRangeTypeMap() { 4036 CVDefRangeTypeMap["reg"] = CVDR_DEFRANGE_REGISTER; 4037 CVDefRangeTypeMap["frame_ptr_rel"] = CVDR_DEFRANGE_FRAMEPOINTER_REL; 4038 CVDefRangeTypeMap["subfield_reg"] = CVDR_DEFRANGE_SUBFIELD_REGISTER; 4039 CVDefRangeTypeMap["reg_rel"] = CVDR_DEFRANGE_REGISTER_REL; 4040 } 4041 4042 /// parseDirectiveCVDefRange 4043 /// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes* 4044 bool AsmParser::parseDirectiveCVDefRange() { 4045 SMLoc Loc; 4046 std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges; 4047 while (getLexer().is(AsmToken::Identifier)) { 4048 Loc = getLexer().getLoc(); 4049 StringRef GapStartName; 4050 if (parseIdentifier(GapStartName)) 4051 return Error(Loc, "expected identifier in directive"); 4052 MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName); 4053 4054 Loc = getLexer().getLoc(); 4055 StringRef GapEndName; 4056 if (parseIdentifier(GapEndName)) 4057 return Error(Loc, "expected identifier in directive"); 4058 MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName); 4059 4060 Ranges.push_back({GapStartSym, GapEndSym}); 4061 } 4062 4063 StringRef CVDefRangeTypeStr; 4064 if (parseToken( 4065 AsmToken::Comma, 4066 "expected comma before def_range type in .cv_def_range directive") || 4067 parseIdentifier(CVDefRangeTypeStr)) 4068 return Error(Loc, "expected def_range type in directive"); 4069 4070 StringMap<CVDefRangeType>::const_iterator CVTypeIt = 4071 CVDefRangeTypeMap.find(CVDefRangeTypeStr); 4072 CVDefRangeType CVDRType = (CVTypeIt == CVDefRangeTypeMap.end()) 4073 ? CVDR_DEFRANGE 4074 : CVTypeIt->getValue(); 4075 switch (CVDRType) { 4076 case CVDR_DEFRANGE_REGISTER: { 4077 int64_t DRRegister; 4078 if (parseToken(AsmToken::Comma, "expected comma before register number in " 4079 ".cv_def_range directive") || 4080 parseAbsoluteExpression(DRRegister)) 4081 return Error(Loc, "expected register number"); 4082 4083 codeview::DefRangeRegisterHeader DRHdr; 4084 DRHdr.Register = DRRegister; 4085 DRHdr.MayHaveNoName = 0; 4086 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4087 break; 4088 } 4089 case CVDR_DEFRANGE_FRAMEPOINTER_REL: { 4090 int64_t DROffset; 4091 if (parseToken(AsmToken::Comma, 4092 "expected comma before offset in .cv_def_range directive") || 4093 parseAbsoluteExpression(DROffset)) 4094 return Error(Loc, "expected offset value"); 4095 4096 codeview::DefRangeFramePointerRelHeader DRHdr; 4097 DRHdr.Offset = DROffset; 4098 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4099 break; 4100 } 4101 case CVDR_DEFRANGE_SUBFIELD_REGISTER: { 4102 int64_t DRRegister; 4103 int64_t DROffsetInParent; 4104 if (parseToken(AsmToken::Comma, "expected comma before register number in " 4105 ".cv_def_range directive") || 4106 parseAbsoluteExpression(DRRegister)) 4107 return Error(Loc, "expected register number"); 4108 if (parseToken(AsmToken::Comma, 4109 "expected comma before offset in .cv_def_range directive") || 4110 parseAbsoluteExpression(DROffsetInParent)) 4111 return Error(Loc, "expected offset value"); 4112 4113 codeview::DefRangeSubfieldRegisterHeader DRHdr; 4114 DRHdr.Register = DRRegister; 4115 DRHdr.MayHaveNoName = 0; 4116 DRHdr.OffsetInParent = DROffsetInParent; 4117 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4118 break; 4119 } 4120 case CVDR_DEFRANGE_REGISTER_REL: { 4121 int64_t DRRegister; 4122 int64_t DRFlags; 4123 int64_t DRBasePointerOffset; 4124 if (parseToken(AsmToken::Comma, "expected comma before register number in " 4125 ".cv_def_range directive") || 4126 parseAbsoluteExpression(DRRegister)) 4127 return Error(Loc, "expected register value"); 4128 if (parseToken( 4129 AsmToken::Comma, 4130 "expected comma before flag value in .cv_def_range directive") || 4131 parseAbsoluteExpression(DRFlags)) 4132 return Error(Loc, "expected flag value"); 4133 if (parseToken(AsmToken::Comma, "expected comma before base pointer offset " 4134 "in .cv_def_range directive") || 4135 parseAbsoluteExpression(DRBasePointerOffset)) 4136 return Error(Loc, "expected base pointer offset value"); 4137 4138 codeview::DefRangeRegisterRelHeader DRHdr; 4139 DRHdr.Register = DRRegister; 4140 DRHdr.Flags = DRFlags; 4141 DRHdr.BasePointerOffset = DRBasePointerOffset; 4142 getStreamer().emitCVDefRangeDirective(Ranges, DRHdr); 4143 break; 4144 } 4145 default: 4146 return Error(Loc, "unexpected def_range type in .cv_def_range directive"); 4147 } 4148 return true; 4149 } 4150 4151 /// parseDirectiveCVString 4152 /// ::= .cv_stringtable "string" 4153 bool AsmParser::parseDirectiveCVString() { 4154 std::string Data; 4155 if (checkForValidSection() || parseEscapedString(Data)) 4156 return true; 4157 4158 // Put the string in the table and emit the offset. 4159 std::pair<StringRef, unsigned> Insertion = 4160 getCVContext().addToStringTable(Data); 4161 getStreamer().emitInt32(Insertion.second); 4162 return false; 4163 } 4164 4165 /// parseDirectiveCVStringTable 4166 /// ::= .cv_stringtable 4167 bool AsmParser::parseDirectiveCVStringTable() { 4168 getStreamer().emitCVStringTableDirective(); 4169 return false; 4170 } 4171 4172 /// parseDirectiveCVFileChecksums 4173 /// ::= .cv_filechecksums 4174 bool AsmParser::parseDirectiveCVFileChecksums() { 4175 getStreamer().emitCVFileChecksumsDirective(); 4176 return false; 4177 } 4178 4179 /// parseDirectiveCVFileChecksumOffset 4180 /// ::= .cv_filechecksumoffset fileno 4181 bool AsmParser::parseDirectiveCVFileChecksumOffset() { 4182 int64_t FileNo; 4183 if (parseIntToken(FileNo, "expected identifier in directive")) 4184 return true; 4185 if (parseEOL()) 4186 return true; 4187 getStreamer().emitCVFileChecksumOffsetDirective(FileNo); 4188 return false; 4189 } 4190 4191 /// parseDirectiveCVFPOData 4192 /// ::= .cv_fpo_data procsym 4193 bool AsmParser::parseDirectiveCVFPOData() { 4194 SMLoc DirLoc = getLexer().getLoc(); 4195 StringRef ProcName; 4196 if (parseIdentifier(ProcName)) 4197 return TokError("expected symbol name"); 4198 if (parseEOL()) 4199 return true; 4200 MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName); 4201 getStreamer().emitCVFPOData(ProcSym, DirLoc); 4202 return false; 4203 } 4204 4205 /// parseDirectiveCFISections 4206 /// ::= .cfi_sections section [, section] 4207 bool AsmParser::parseDirectiveCFISections() { 4208 StringRef Name; 4209 bool EH = false; 4210 bool Debug = false; 4211 4212 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4213 for (;;) { 4214 if (parseIdentifier(Name)) 4215 return TokError("expected .eh_frame or .debug_frame"); 4216 if (Name == ".eh_frame") 4217 EH = true; 4218 else if (Name == ".debug_frame") 4219 Debug = true; 4220 if (parseOptionalToken(AsmToken::EndOfStatement)) 4221 break; 4222 if (parseComma()) 4223 return true; 4224 } 4225 } 4226 getStreamer().emitCFISections(EH, Debug); 4227 return false; 4228 } 4229 4230 /// parseDirectiveCFIStartProc 4231 /// ::= .cfi_startproc [simple] 4232 bool AsmParser::parseDirectiveCFIStartProc() { 4233 CFIStartProcLoc = StartTokLoc; 4234 4235 StringRef Simple; 4236 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4237 if (check(parseIdentifier(Simple) || Simple != "simple", 4238 "unexpected token") || 4239 parseEOL()) 4240 return true; 4241 } 4242 4243 // TODO(kristina): Deal with a corner case of incorrect diagnostic context 4244 // being produced if this directive is emitted as part of preprocessor macro 4245 // expansion which can *ONLY* happen if Clang's cc1as is the API consumer. 4246 // Tools like llvm-mc on the other hand are not affected by it, and report 4247 // correct context information. 4248 getStreamer().emitCFIStartProc(!Simple.empty(), Lexer.getLoc()); 4249 return false; 4250 } 4251 4252 /// parseDirectiveCFIEndProc 4253 /// ::= .cfi_endproc 4254 bool AsmParser::parseDirectiveCFIEndProc() { 4255 CFIStartProcLoc = std::nullopt; 4256 4257 if (parseEOL()) 4258 return true; 4259 4260 getStreamer().emitCFIEndProc(); 4261 return false; 4262 } 4263 4264 /// parse register name or number. 4265 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register, 4266 SMLoc DirectiveLoc) { 4267 MCRegister RegNo; 4268 4269 if (getLexer().isNot(AsmToken::Integer)) { 4270 if (getTargetParser().parseRegister(RegNo, DirectiveLoc, DirectiveLoc)) 4271 return true; 4272 Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true); 4273 } else 4274 return parseAbsoluteExpression(Register); 4275 4276 return false; 4277 } 4278 4279 /// parseDirectiveCFIDefCfa 4280 /// ::= .cfi_def_cfa register, offset 4281 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) { 4282 int64_t Register = 0, Offset = 0; 4283 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4284 parseAbsoluteExpression(Offset) || parseEOL()) 4285 return true; 4286 4287 getStreamer().emitCFIDefCfa(Register, Offset, DirectiveLoc); 4288 return false; 4289 } 4290 4291 /// parseDirectiveCFIDefCfaOffset 4292 /// ::= .cfi_def_cfa_offset offset 4293 bool AsmParser::parseDirectiveCFIDefCfaOffset(SMLoc DirectiveLoc) { 4294 int64_t Offset = 0; 4295 if (parseAbsoluteExpression(Offset) || parseEOL()) 4296 return true; 4297 4298 getStreamer().emitCFIDefCfaOffset(Offset, DirectiveLoc); 4299 return false; 4300 } 4301 4302 /// parseDirectiveCFIRegister 4303 /// ::= .cfi_register register, register 4304 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) { 4305 int64_t Register1 = 0, Register2 = 0; 4306 if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc) || parseComma() || 4307 parseRegisterOrRegisterNumber(Register2, DirectiveLoc) || parseEOL()) 4308 return true; 4309 4310 getStreamer().emitCFIRegister(Register1, Register2, DirectiveLoc); 4311 return false; 4312 } 4313 4314 /// parseDirectiveCFIWindowSave 4315 /// ::= .cfi_window_save 4316 bool AsmParser::parseDirectiveCFIWindowSave(SMLoc DirectiveLoc) { 4317 if (parseEOL()) 4318 return true; 4319 getStreamer().emitCFIWindowSave(DirectiveLoc); 4320 return false; 4321 } 4322 4323 /// parseDirectiveCFIAdjustCfaOffset 4324 /// ::= .cfi_adjust_cfa_offset adjustment 4325 bool AsmParser::parseDirectiveCFIAdjustCfaOffset(SMLoc DirectiveLoc) { 4326 int64_t Adjustment = 0; 4327 if (parseAbsoluteExpression(Adjustment) || parseEOL()) 4328 return true; 4329 4330 getStreamer().emitCFIAdjustCfaOffset(Adjustment, DirectiveLoc); 4331 return false; 4332 } 4333 4334 /// parseDirectiveCFIDefCfaRegister 4335 /// ::= .cfi_def_cfa_register register 4336 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) { 4337 int64_t Register = 0; 4338 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4339 return true; 4340 4341 getStreamer().emitCFIDefCfaRegister(Register, DirectiveLoc); 4342 return false; 4343 } 4344 4345 /// parseDirectiveCFILLVMDefAspaceCfa 4346 /// ::= .cfi_llvm_def_aspace_cfa register, offset, address_space 4347 bool AsmParser::parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc) { 4348 int64_t Register = 0, Offset = 0, AddressSpace = 0; 4349 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4350 parseAbsoluteExpression(Offset) || parseComma() || 4351 parseAbsoluteExpression(AddressSpace) || parseEOL()) 4352 return true; 4353 4354 getStreamer().emitCFILLVMDefAspaceCfa(Register, Offset, AddressSpace, 4355 DirectiveLoc); 4356 return false; 4357 } 4358 4359 /// parseDirectiveCFIOffset 4360 /// ::= .cfi_offset register, offset 4361 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) { 4362 int64_t Register = 0; 4363 int64_t Offset = 0; 4364 4365 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4366 parseAbsoluteExpression(Offset) || parseEOL()) 4367 return true; 4368 4369 getStreamer().emitCFIOffset(Register, Offset, DirectiveLoc); 4370 return false; 4371 } 4372 4373 /// parseDirectiveCFIRelOffset 4374 /// ::= .cfi_rel_offset register, offset 4375 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) { 4376 int64_t Register = 0, Offset = 0; 4377 4378 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4379 parseAbsoluteExpression(Offset) || parseEOL()) 4380 return true; 4381 4382 getStreamer().emitCFIRelOffset(Register, Offset, DirectiveLoc); 4383 return false; 4384 } 4385 4386 static bool isValidEncoding(int64_t Encoding) { 4387 if (Encoding & ~0xff) 4388 return false; 4389 4390 if (Encoding == dwarf::DW_EH_PE_omit) 4391 return true; 4392 4393 const unsigned Format = Encoding & 0xf; 4394 if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && 4395 Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && 4396 Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && 4397 Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) 4398 return false; 4399 4400 const unsigned Application = Encoding & 0x70; 4401 if (Application != dwarf::DW_EH_PE_absptr && 4402 Application != dwarf::DW_EH_PE_pcrel) 4403 return false; 4404 4405 return true; 4406 } 4407 4408 /// parseDirectiveCFIPersonalityOrLsda 4409 /// IsPersonality true for cfi_personality, false for cfi_lsda 4410 /// ::= .cfi_personality encoding, [symbol_name] 4411 /// ::= .cfi_lsda encoding, [symbol_name] 4412 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) { 4413 int64_t Encoding = 0; 4414 if (parseAbsoluteExpression(Encoding)) 4415 return true; 4416 if (Encoding == dwarf::DW_EH_PE_omit) 4417 return false; 4418 4419 StringRef Name; 4420 if (check(!isValidEncoding(Encoding), "unsupported encoding.") || 4421 parseComma() || 4422 check(parseIdentifier(Name), "expected identifier in directive") || 4423 parseEOL()) 4424 return true; 4425 4426 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 4427 4428 if (IsPersonality) 4429 getStreamer().emitCFIPersonality(Sym, Encoding); 4430 else 4431 getStreamer().emitCFILsda(Sym, Encoding); 4432 return false; 4433 } 4434 4435 /// parseDirectiveCFIRememberState 4436 /// ::= .cfi_remember_state 4437 bool AsmParser::parseDirectiveCFIRememberState(SMLoc DirectiveLoc) { 4438 if (parseEOL()) 4439 return true; 4440 getStreamer().emitCFIRememberState(DirectiveLoc); 4441 return false; 4442 } 4443 4444 /// parseDirectiveCFIRestoreState 4445 /// ::= .cfi_remember_state 4446 bool AsmParser::parseDirectiveCFIRestoreState(SMLoc DirectiveLoc) { 4447 if (parseEOL()) 4448 return true; 4449 getStreamer().emitCFIRestoreState(DirectiveLoc); 4450 return false; 4451 } 4452 4453 /// parseDirectiveCFISameValue 4454 /// ::= .cfi_same_value register 4455 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) { 4456 int64_t Register = 0; 4457 4458 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4459 return true; 4460 4461 getStreamer().emitCFISameValue(Register, DirectiveLoc); 4462 return false; 4463 } 4464 4465 /// parseDirectiveCFIRestore 4466 /// ::= .cfi_restore register 4467 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) { 4468 int64_t Register = 0; 4469 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4470 return true; 4471 4472 getStreamer().emitCFIRestore(Register, DirectiveLoc); 4473 return false; 4474 } 4475 4476 /// parseDirectiveCFIEscape 4477 /// ::= .cfi_escape expression[,...] 4478 bool AsmParser::parseDirectiveCFIEscape(SMLoc DirectiveLoc) { 4479 std::string Values; 4480 int64_t CurrValue; 4481 if (parseAbsoluteExpression(CurrValue)) 4482 return true; 4483 4484 Values.push_back((uint8_t)CurrValue); 4485 4486 while (getLexer().is(AsmToken::Comma)) { 4487 Lex(); 4488 4489 if (parseAbsoluteExpression(CurrValue)) 4490 return true; 4491 4492 Values.push_back((uint8_t)CurrValue); 4493 } 4494 4495 getStreamer().emitCFIEscape(Values, DirectiveLoc); 4496 return false; 4497 } 4498 4499 /// parseDirectiveCFIReturnColumn 4500 /// ::= .cfi_return_column register 4501 bool AsmParser::parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc) { 4502 int64_t Register = 0; 4503 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4504 return true; 4505 getStreamer().emitCFIReturnColumn(Register); 4506 return false; 4507 } 4508 4509 /// parseDirectiveCFISignalFrame 4510 /// ::= .cfi_signal_frame 4511 bool AsmParser::parseDirectiveCFISignalFrame(SMLoc DirectiveLoc) { 4512 if (parseEOL()) 4513 return true; 4514 4515 getStreamer().emitCFISignalFrame(); 4516 return false; 4517 } 4518 4519 /// parseDirectiveCFIUndefined 4520 /// ::= .cfi_undefined register 4521 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) { 4522 int64_t Register = 0; 4523 4524 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL()) 4525 return true; 4526 4527 getStreamer().emitCFIUndefined(Register, DirectiveLoc); 4528 return false; 4529 } 4530 4531 /// parseDirectiveCFILabel 4532 /// ::= .cfi_label label 4533 bool AsmParser::parseDirectiveCFILabel(SMLoc Loc) { 4534 StringRef Name; 4535 Loc = Lexer.getLoc(); 4536 if (parseIdentifier(Name)) 4537 return TokError("expected identifier"); 4538 if (parseEOL()) 4539 return true; 4540 getStreamer().emitCFILabelDirective(Loc, Name); 4541 return false; 4542 } 4543 4544 /// parseDirectiveCFIValOffset 4545 /// ::= .cfi_val_offset register, offset 4546 bool AsmParser::parseDirectiveCFIValOffset(SMLoc DirectiveLoc) { 4547 int64_t Register = 0; 4548 int64_t Offset = 0; 4549 4550 if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() || 4551 parseAbsoluteExpression(Offset) || parseEOL()) 4552 return true; 4553 4554 getStreamer().emitCFIValOffset(Register, Offset, DirectiveLoc); 4555 return false; 4556 } 4557 4558 /// parseDirectiveAltmacro 4559 /// ::= .altmacro 4560 /// ::= .noaltmacro 4561 bool AsmParser::parseDirectiveAltmacro(StringRef Directive) { 4562 if (parseEOL()) 4563 return true; 4564 AltMacroMode = (Directive == ".altmacro"); 4565 return false; 4566 } 4567 4568 /// parseDirectiveMacrosOnOff 4569 /// ::= .macros_on 4570 /// ::= .macros_off 4571 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) { 4572 if (parseEOL()) 4573 return true; 4574 setMacrosEnabled(Directive == ".macros_on"); 4575 return false; 4576 } 4577 4578 /// parseDirectiveMacro 4579 /// ::= .macro name[,] [parameters] 4580 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) { 4581 StringRef Name; 4582 if (parseIdentifier(Name)) 4583 return TokError("expected identifier in '.macro' directive"); 4584 4585 if (getLexer().is(AsmToken::Comma)) 4586 Lex(); 4587 4588 MCAsmMacroParameters Parameters; 4589 while (getLexer().isNot(AsmToken::EndOfStatement)) { 4590 4591 if (!Parameters.empty() && Parameters.back().Vararg) 4592 return Error(Lexer.getLoc(), "vararg parameter '" + 4593 Parameters.back().Name + 4594 "' should be the last parameter"); 4595 4596 MCAsmMacroParameter Parameter; 4597 if (parseIdentifier(Parameter.Name)) 4598 return TokError("expected identifier in '.macro' directive"); 4599 4600 // Emit an error if two (or more) named parameters share the same name 4601 for (const MCAsmMacroParameter& CurrParam : Parameters) 4602 if (CurrParam.Name == Parameter.Name) 4603 return TokError("macro '" + Name + "' has multiple parameters" 4604 " named '" + Parameter.Name + "'"); 4605 4606 if (Lexer.is(AsmToken::Colon)) { 4607 Lex(); // consume ':' 4608 4609 SMLoc QualLoc; 4610 StringRef Qualifier; 4611 4612 QualLoc = Lexer.getLoc(); 4613 if (parseIdentifier(Qualifier)) 4614 return Error(QualLoc, "missing parameter qualifier for " 4615 "'" + Parameter.Name + "' in macro '" + Name + "'"); 4616 4617 if (Qualifier == "req") 4618 Parameter.Required = true; 4619 else if (Qualifier == "vararg") 4620 Parameter.Vararg = true; 4621 else 4622 return Error(QualLoc, Qualifier + " is not a valid parameter qualifier " 4623 "for '" + Parameter.Name + "' in macro '" + Name + "'"); 4624 } 4625 4626 if (getLexer().is(AsmToken::Equal)) { 4627 Lex(); 4628 4629 SMLoc ParamLoc; 4630 4631 ParamLoc = Lexer.getLoc(); 4632 if (parseMacroArgument(Parameter.Value, /*Vararg=*/false )) 4633 return true; 4634 4635 if (Parameter.Required) 4636 Warning(ParamLoc, "pointless default value for required parameter " 4637 "'" + Parameter.Name + "' in macro '" + Name + "'"); 4638 } 4639 4640 Parameters.push_back(std::move(Parameter)); 4641 4642 if (getLexer().is(AsmToken::Comma)) 4643 Lex(); 4644 } 4645 4646 // Eat just the end of statement. 4647 Lexer.Lex(); 4648 4649 // Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors 4650 AsmToken EndToken, StartToken = getTok(); 4651 unsigned MacroDepth = 0; 4652 // Lex the macro definition. 4653 while (true) { 4654 // Ignore Lexing errors in macros. 4655 while (Lexer.is(AsmToken::Error)) { 4656 Lexer.Lex(); 4657 } 4658 4659 // Check whether we have reached the end of the file. 4660 if (getLexer().is(AsmToken::Eof)) 4661 return Error(DirectiveLoc, "no matching '.endmacro' in definition"); 4662 4663 // Otherwise, check whether we have reach the .endmacro or the start of a 4664 // preprocessor line marker. 4665 if (getLexer().is(AsmToken::Identifier)) { 4666 if (getTok().getIdentifier() == ".endm" || 4667 getTok().getIdentifier() == ".endmacro") { 4668 if (MacroDepth == 0) { // Outermost macro. 4669 EndToken = getTok(); 4670 Lexer.Lex(); 4671 if (getLexer().isNot(AsmToken::EndOfStatement)) 4672 return TokError("unexpected token in '" + EndToken.getIdentifier() + 4673 "' directive"); 4674 break; 4675 } else { 4676 // Otherwise we just found the end of an inner macro. 4677 --MacroDepth; 4678 } 4679 } else if (getTok().getIdentifier() == ".macro") { 4680 // We allow nested macros. Those aren't instantiated until the outermost 4681 // macro is expanded so just ignore them for now. 4682 ++MacroDepth; 4683 } 4684 } else if (Lexer.is(AsmToken::HashDirective)) { 4685 (void)parseCppHashLineFilenameComment(getLexer().getLoc()); 4686 } 4687 4688 // Otherwise, scan til the end of the statement. 4689 eatToEndOfStatement(); 4690 } 4691 4692 if (getContext().lookupMacro(Name)) { 4693 return Error(DirectiveLoc, "macro '" + Name + "' is already defined"); 4694 } 4695 4696 const char *BodyStart = StartToken.getLoc().getPointer(); 4697 const char *BodyEnd = EndToken.getLoc().getPointer(); 4698 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 4699 checkForBadMacro(DirectiveLoc, Name, Body, Parameters); 4700 MCAsmMacro Macro(Name, Body, std::move(Parameters)); 4701 DEBUG_WITH_TYPE("asm-macros", dbgs() << "Defining new macro:\n"; 4702 Macro.dump()); 4703 getContext().defineMacro(Name, std::move(Macro)); 4704 return false; 4705 } 4706 4707 /// checkForBadMacro 4708 /// 4709 /// With the support added for named parameters there may be code out there that 4710 /// is transitioning from positional parameters. In versions of gas that did 4711 /// not support named parameters they would be ignored on the macro definition. 4712 /// But to support both styles of parameters this is not possible so if a macro 4713 /// definition has named parameters but does not use them and has what appears 4714 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a 4715 /// warning that the positional parameter found in body which have no effect. 4716 /// Hoping the developer will either remove the named parameters from the macro 4717 /// definition so the positional parameters get used if that was what was 4718 /// intended or change the macro to use the named parameters. It is possible 4719 /// this warning will trigger when the none of the named parameters are used 4720 /// and the strings like $1 are infact to simply to be passed trough unchanged. 4721 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, 4722 StringRef Body, 4723 ArrayRef<MCAsmMacroParameter> Parameters) { 4724 // If this macro is not defined with named parameters the warning we are 4725 // checking for here doesn't apply. 4726 unsigned NParameters = Parameters.size(); 4727 if (NParameters == 0) 4728 return; 4729 4730 bool NamedParametersFound = false; 4731 bool PositionalParametersFound = false; 4732 4733 // Look at the body of the macro for use of both the named parameters and what 4734 // are likely to be positional parameters. This is what expandMacro() is 4735 // doing when it finds the parameters in the body. 4736 while (!Body.empty()) { 4737 // Scan for the next possible parameter. 4738 std::size_t End = Body.size(), Pos = 0; 4739 for (; Pos != End; ++Pos) { 4740 // Check for a substitution or escape. 4741 // This macro is defined with parameters, look for \foo, \bar, etc. 4742 if (Body[Pos] == '\\' && Pos + 1 != End) 4743 break; 4744 4745 // This macro should have parameters, but look for $0, $1, ..., $n too. 4746 if (Body[Pos] != '$' || Pos + 1 == End) 4747 continue; 4748 char Next = Body[Pos + 1]; 4749 if (Next == '$' || Next == 'n' || 4750 isdigit(static_cast<unsigned char>(Next))) 4751 break; 4752 } 4753 4754 // Check if we reached the end. 4755 if (Pos == End) 4756 break; 4757 4758 if (Body[Pos] == '$') { 4759 switch (Body[Pos + 1]) { 4760 // $$ => $ 4761 case '$': 4762 break; 4763 4764 // $n => number of arguments 4765 case 'n': 4766 PositionalParametersFound = true; 4767 break; 4768 4769 // $[0-9] => argument 4770 default: { 4771 PositionalParametersFound = true; 4772 break; 4773 } 4774 } 4775 Pos += 2; 4776 } else { 4777 unsigned I = Pos + 1; 4778 while (isIdentifierChar(Body[I]) && I + 1 != End) 4779 ++I; 4780 4781 const char *Begin = Body.data() + Pos + 1; 4782 StringRef Argument(Begin, I - (Pos + 1)); 4783 unsigned Index = 0; 4784 for (; Index < NParameters; ++Index) 4785 if (Parameters[Index].Name == Argument) 4786 break; 4787 4788 if (Index == NParameters) { 4789 if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')') 4790 Pos += 3; 4791 else { 4792 Pos = I; 4793 } 4794 } else { 4795 NamedParametersFound = true; 4796 Pos += 1 + Argument.size(); 4797 } 4798 } 4799 // Update the scan point. 4800 Body = Body.substr(Pos); 4801 } 4802 4803 if (!NamedParametersFound && PositionalParametersFound) 4804 Warning(DirectiveLoc, "macro defined with named parameters which are not " 4805 "used in macro body, possible positional parameter " 4806 "found in body which will have no effect"); 4807 } 4808 4809 /// parseDirectiveExitMacro 4810 /// ::= .exitm 4811 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) { 4812 if (parseEOL()) 4813 return true; 4814 4815 if (!isInsideMacroInstantiation()) 4816 return TokError("unexpected '" + Directive + "' in file, " 4817 "no current macro definition"); 4818 4819 // Exit all conditionals that are active in the current macro. 4820 while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) { 4821 TheCondState = TheCondStack.back(); 4822 TheCondStack.pop_back(); 4823 } 4824 4825 handleMacroExit(); 4826 return false; 4827 } 4828 4829 /// parseDirectiveEndMacro 4830 /// ::= .endm 4831 /// ::= .endmacro 4832 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) { 4833 if (getLexer().isNot(AsmToken::EndOfStatement)) 4834 return TokError("unexpected token in '" + Directive + "' directive"); 4835 4836 // If we are inside a macro instantiation, terminate the current 4837 // instantiation. 4838 if (isInsideMacroInstantiation()) { 4839 handleMacroExit(); 4840 return false; 4841 } 4842 4843 // Otherwise, this .endmacro is a stray entry in the file; well formed 4844 // .endmacro directives are handled during the macro definition parsing. 4845 return TokError("unexpected '" + Directive + "' in file, " 4846 "no current macro definition"); 4847 } 4848 4849 /// parseDirectivePurgeMacro 4850 /// ::= .purgem name 4851 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) { 4852 StringRef Name; 4853 SMLoc Loc; 4854 if (parseTokenLoc(Loc) || 4855 check(parseIdentifier(Name), Loc, 4856 "expected identifier in '.purgem' directive") || 4857 parseEOL()) 4858 return true; 4859 4860 if (!getContext().lookupMacro(Name)) 4861 return Error(DirectiveLoc, "macro '" + Name + "' is not defined"); 4862 4863 getContext().undefineMacro(Name); 4864 DEBUG_WITH_TYPE("asm-macros", dbgs() 4865 << "Un-defining macro: " << Name << "\n"); 4866 return false; 4867 } 4868 4869 /// parseDirectiveBundleAlignMode 4870 /// ::= {.bundle_align_mode} expression 4871 bool AsmParser::parseDirectiveBundleAlignMode() { 4872 // Expect a single argument: an expression that evaluates to a constant 4873 // in the inclusive range 0-30. 4874 SMLoc ExprLoc = getLexer().getLoc(); 4875 int64_t AlignSizePow2; 4876 if (checkForValidSection() || parseAbsoluteExpression(AlignSizePow2) || 4877 parseEOL() || 4878 check(AlignSizePow2 < 0 || AlignSizePow2 > 30, ExprLoc, 4879 "invalid bundle alignment size (expected between 0 and 30)")) 4880 return true; 4881 4882 getStreamer().emitBundleAlignMode(Align(1ULL << AlignSizePow2)); 4883 return false; 4884 } 4885 4886 /// parseDirectiveBundleLock 4887 /// ::= {.bundle_lock} [align_to_end] 4888 bool AsmParser::parseDirectiveBundleLock() { 4889 if (checkForValidSection()) 4890 return true; 4891 bool AlignToEnd = false; 4892 4893 StringRef Option; 4894 SMLoc Loc = getTok().getLoc(); 4895 const char *kInvalidOptionError = 4896 "invalid option for '.bundle_lock' directive"; 4897 4898 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 4899 if (check(parseIdentifier(Option), Loc, kInvalidOptionError) || 4900 check(Option != "align_to_end", Loc, kInvalidOptionError) || parseEOL()) 4901 return true; 4902 AlignToEnd = true; 4903 } 4904 4905 getStreamer().emitBundleLock(AlignToEnd); 4906 return false; 4907 } 4908 4909 /// parseDirectiveBundleLock 4910 /// ::= {.bundle_lock} 4911 bool AsmParser::parseDirectiveBundleUnlock() { 4912 if (checkForValidSection() || parseEOL()) 4913 return true; 4914 4915 getStreamer().emitBundleUnlock(); 4916 return false; 4917 } 4918 4919 /// parseDirectiveSpace 4920 /// ::= (.skip | .space) expression [ , expression ] 4921 bool AsmParser::parseDirectiveSpace(StringRef IDVal) { 4922 SMLoc NumBytesLoc = Lexer.getLoc(); 4923 const MCExpr *NumBytes; 4924 if (checkForValidSection() || parseExpression(NumBytes)) 4925 return true; 4926 4927 int64_t FillExpr = 0; 4928 if (parseOptionalToken(AsmToken::Comma)) 4929 if (parseAbsoluteExpression(FillExpr)) 4930 return true; 4931 if (parseEOL()) 4932 return true; 4933 4934 // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0. 4935 getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc); 4936 4937 return false; 4938 } 4939 4940 /// parseDirectiveDCB 4941 /// ::= .dcb.{b, l, w} expression, expression 4942 bool AsmParser::parseDirectiveDCB(StringRef IDVal, unsigned Size) { 4943 SMLoc NumValuesLoc = Lexer.getLoc(); 4944 int64_t NumValues; 4945 if (checkForValidSection() || parseAbsoluteExpression(NumValues)) 4946 return true; 4947 4948 if (NumValues < 0) { 4949 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4950 return false; 4951 } 4952 4953 if (parseComma()) 4954 return true; 4955 4956 const MCExpr *Value; 4957 SMLoc ExprLoc = getLexer().getLoc(); 4958 if (parseExpression(Value)) 4959 return true; 4960 4961 // Special case constant expressions to match code generator. 4962 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) { 4963 assert(Size <= 8 && "Invalid size"); 4964 uint64_t IntValue = MCE->getValue(); 4965 if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue)) 4966 return Error(ExprLoc, "literal value out of range for directive"); 4967 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4968 getStreamer().emitIntValue(IntValue, Size); 4969 } else { 4970 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4971 getStreamer().emitValue(Value, Size, ExprLoc); 4972 } 4973 4974 return parseEOL(); 4975 } 4976 4977 /// parseDirectiveRealDCB 4978 /// ::= .dcb.{d, s} expression, expression 4979 bool AsmParser::parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &Semantics) { 4980 SMLoc NumValuesLoc = Lexer.getLoc(); 4981 int64_t NumValues; 4982 if (checkForValidSection() || parseAbsoluteExpression(NumValues)) 4983 return true; 4984 4985 if (NumValues < 0) { 4986 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 4987 return false; 4988 } 4989 4990 if (parseComma()) 4991 return true; 4992 4993 APInt AsInt; 4994 if (parseRealValue(Semantics, AsInt) || parseEOL()) 4995 return true; 4996 4997 for (uint64_t i = 0, e = NumValues; i != e; ++i) 4998 getStreamer().emitIntValue(AsInt.getLimitedValue(), 4999 AsInt.getBitWidth() / 8); 5000 5001 return false; 5002 } 5003 5004 /// parseDirectiveDS 5005 /// ::= .ds.{b, d, l, p, s, w, x} expression 5006 bool AsmParser::parseDirectiveDS(StringRef IDVal, unsigned Size) { 5007 SMLoc NumValuesLoc = Lexer.getLoc(); 5008 int64_t NumValues; 5009 if (checkForValidSection() || parseAbsoluteExpression(NumValues) || 5010 parseEOL()) 5011 return true; 5012 5013 if (NumValues < 0) { 5014 Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect"); 5015 return false; 5016 } 5017 5018 for (uint64_t i = 0, e = NumValues; i != e; ++i) 5019 getStreamer().emitFill(Size, 0); 5020 5021 return false; 5022 } 5023 5024 /// parseDirectiveLEB128 5025 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ] 5026 bool AsmParser::parseDirectiveLEB128(bool Signed) { 5027 if (checkForValidSection()) 5028 return true; 5029 5030 auto parseOp = [&]() -> bool { 5031 const MCExpr *Value; 5032 if (parseExpression(Value)) 5033 return true; 5034 if (Signed) 5035 getStreamer().emitSLEB128Value(Value); 5036 else 5037 getStreamer().emitULEB128Value(Value); 5038 return false; 5039 }; 5040 5041 return parseMany(parseOp); 5042 } 5043 5044 /// parseDirectiveSymbolAttribute 5045 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ] 5046 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) { 5047 auto parseOp = [&]() -> bool { 5048 StringRef Name; 5049 SMLoc Loc = getTok().getLoc(); 5050 if (parseIdentifier(Name)) 5051 return Error(Loc, "expected identifier"); 5052 5053 if (discardLTOSymbol(Name)) 5054 return false; 5055 5056 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 5057 5058 // Assembler local symbols don't make any sense here, except for directives 5059 // that the symbol should be tagged. 5060 if (Sym->isTemporary() && Attr != MCSA_Memtag) 5061 return Error(Loc, "non-local symbol required"); 5062 5063 if (!getStreamer().emitSymbolAttribute(Sym, Attr)) 5064 return Error(Loc, "unable to emit symbol attribute"); 5065 return false; 5066 }; 5067 5068 return parseMany(parseOp); 5069 } 5070 5071 /// parseDirectiveComm 5072 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ] 5073 bool AsmParser::parseDirectiveComm(bool IsLocal) { 5074 if (checkForValidSection()) 5075 return true; 5076 5077 SMLoc IDLoc = getLexer().getLoc(); 5078 StringRef Name; 5079 if (parseIdentifier(Name)) 5080 return TokError("expected identifier in directive"); 5081 5082 // Handle the identifier as the key symbol. 5083 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 5084 5085 if (parseComma()) 5086 return true; 5087 5088 int64_t Size; 5089 SMLoc SizeLoc = getLexer().getLoc(); 5090 if (parseAbsoluteExpression(Size)) 5091 return true; 5092 5093 int64_t Pow2Alignment = 0; 5094 SMLoc Pow2AlignmentLoc; 5095 if (getLexer().is(AsmToken::Comma)) { 5096 Lex(); 5097 Pow2AlignmentLoc = getLexer().getLoc(); 5098 if (parseAbsoluteExpression(Pow2Alignment)) 5099 return true; 5100 5101 LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType(); 5102 if (IsLocal && LCOMM == LCOMM::NoAlignment) 5103 return Error(Pow2AlignmentLoc, "alignment not supported on this target"); 5104 5105 // If this target takes alignments in bytes (not log) validate and convert. 5106 if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) || 5107 (IsLocal && LCOMM == LCOMM::ByteAlignment)) { 5108 if (!isPowerOf2_64(Pow2Alignment)) 5109 return Error(Pow2AlignmentLoc, "alignment must be a power of 2"); 5110 Pow2Alignment = Log2_64(Pow2Alignment); 5111 } 5112 } 5113 5114 if (parseEOL()) 5115 return true; 5116 5117 // NOTE: a size of zero for a .comm should create a undefined symbol 5118 // but a size of .lcomm creates a bss symbol of size zero. 5119 if (Size < 0) 5120 return Error(SizeLoc, "size must be non-negative"); 5121 5122 Sym->redefineIfPossible(); 5123 if (!Sym->isUndefined()) 5124 return Error(IDLoc, "invalid symbol redefinition"); 5125 5126 // Create the Symbol as a common or local common with Size and Pow2Alignment 5127 if (IsLocal) { 5128 getStreamer().emitLocalCommonSymbol(Sym, Size, 5129 Align(1ULL << Pow2Alignment)); 5130 return false; 5131 } 5132 5133 getStreamer().emitCommonSymbol(Sym, Size, Align(1ULL << Pow2Alignment)); 5134 return false; 5135 } 5136 5137 /// parseDirectiveAbort 5138 /// ::= .abort [... message ...] 5139 bool AsmParser::parseDirectiveAbort(SMLoc DirectiveLoc) { 5140 StringRef Str = parseStringToEndOfStatement(); 5141 if (parseEOL()) 5142 return true; 5143 5144 if (Str.empty()) 5145 return Error(DirectiveLoc, ".abort detected. Assembly stopping"); 5146 5147 // FIXME: Actually abort assembly here. 5148 return Error(DirectiveLoc, 5149 ".abort '" + Str + "' detected. Assembly stopping"); 5150 } 5151 5152 /// parseDirectiveInclude 5153 /// ::= .include "filename" 5154 bool AsmParser::parseDirectiveInclude() { 5155 // Allow the strings to have escaped octal character sequence. 5156 std::string Filename; 5157 SMLoc IncludeLoc = getTok().getLoc(); 5158 5159 if (check(getTok().isNot(AsmToken::String), 5160 "expected string in '.include' directive") || 5161 parseEscapedString(Filename) || 5162 check(getTok().isNot(AsmToken::EndOfStatement), 5163 "unexpected token in '.include' directive") || 5164 // Attempt to switch the lexer to the included file before consuming the 5165 // end of statement to avoid losing it when we switch. 5166 check(enterIncludeFile(Filename), IncludeLoc, 5167 "Could not find include file '" + Filename + "'")) 5168 return true; 5169 5170 return false; 5171 } 5172 5173 /// parseDirectiveIncbin 5174 /// ::= .incbin "filename" [ , skip [ , count ] ] 5175 bool AsmParser::parseDirectiveIncbin() { 5176 // Allow the strings to have escaped octal character sequence. 5177 std::string Filename; 5178 SMLoc IncbinLoc = getTok().getLoc(); 5179 if (check(getTok().isNot(AsmToken::String), 5180 "expected string in '.incbin' directive") || 5181 parseEscapedString(Filename)) 5182 return true; 5183 5184 int64_t Skip = 0; 5185 const MCExpr *Count = nullptr; 5186 SMLoc SkipLoc, CountLoc; 5187 if (parseOptionalToken(AsmToken::Comma)) { 5188 // The skip expression can be omitted while specifying the count, e.g: 5189 // .incbin "filename",,4 5190 if (getTok().isNot(AsmToken::Comma)) { 5191 if (parseTokenLoc(SkipLoc) || parseAbsoluteExpression(Skip)) 5192 return true; 5193 } 5194 if (parseOptionalToken(AsmToken::Comma)) { 5195 CountLoc = getTok().getLoc(); 5196 if (parseExpression(Count)) 5197 return true; 5198 } 5199 } 5200 5201 if (parseEOL()) 5202 return true; 5203 5204 if (check(Skip < 0, SkipLoc, "skip is negative")) 5205 return true; 5206 5207 // Attempt to process the included file. 5208 if (processIncbinFile(Filename, Skip, Count, CountLoc)) 5209 return Error(IncbinLoc, "Could not find incbin file '" + Filename + "'"); 5210 return false; 5211 } 5212 5213 /// parseDirectiveIf 5214 /// ::= .if{,eq,ge,gt,le,lt,ne} expression 5215 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) { 5216 TheCondStack.push_back(TheCondState); 5217 TheCondState.TheCond = AsmCond::IfCond; 5218 if (TheCondState.Ignore) { 5219 eatToEndOfStatement(); 5220 } else { 5221 int64_t ExprValue; 5222 if (parseAbsoluteExpression(ExprValue) || parseEOL()) 5223 return true; 5224 5225 switch (DirKind) { 5226 default: 5227 llvm_unreachable("unsupported directive"); 5228 case DK_IF: 5229 case DK_IFNE: 5230 break; 5231 case DK_IFEQ: 5232 ExprValue = ExprValue == 0; 5233 break; 5234 case DK_IFGE: 5235 ExprValue = ExprValue >= 0; 5236 break; 5237 case DK_IFGT: 5238 ExprValue = ExprValue > 0; 5239 break; 5240 case DK_IFLE: 5241 ExprValue = ExprValue <= 0; 5242 break; 5243 case DK_IFLT: 5244 ExprValue = ExprValue < 0; 5245 break; 5246 } 5247 5248 TheCondState.CondMet = ExprValue; 5249 TheCondState.Ignore = !TheCondState.CondMet; 5250 } 5251 5252 return false; 5253 } 5254 5255 /// parseDirectiveIfb 5256 /// ::= .ifb string 5257 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) { 5258 TheCondStack.push_back(TheCondState); 5259 TheCondState.TheCond = AsmCond::IfCond; 5260 5261 if (TheCondState.Ignore) { 5262 eatToEndOfStatement(); 5263 } else { 5264 StringRef Str = parseStringToEndOfStatement(); 5265 5266 if (parseEOL()) 5267 return true; 5268 5269 TheCondState.CondMet = ExpectBlank == Str.empty(); 5270 TheCondState.Ignore = !TheCondState.CondMet; 5271 } 5272 5273 return false; 5274 } 5275 5276 /// parseDirectiveIfc 5277 /// ::= .ifc string1, string2 5278 /// ::= .ifnc string1, string2 5279 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) { 5280 TheCondStack.push_back(TheCondState); 5281 TheCondState.TheCond = AsmCond::IfCond; 5282 5283 if (TheCondState.Ignore) { 5284 eatToEndOfStatement(); 5285 } else { 5286 StringRef Str1 = parseStringToComma(); 5287 5288 if (parseComma()) 5289 return true; 5290 5291 StringRef Str2 = parseStringToEndOfStatement(); 5292 5293 if (parseEOL()) 5294 return true; 5295 5296 TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim()); 5297 TheCondState.Ignore = !TheCondState.CondMet; 5298 } 5299 5300 return false; 5301 } 5302 5303 /// parseDirectiveIfeqs 5304 /// ::= .ifeqs string1, string2 5305 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) { 5306 if (Lexer.isNot(AsmToken::String)) { 5307 if (ExpectEqual) 5308 return TokError("expected string parameter for '.ifeqs' directive"); 5309 return TokError("expected string parameter for '.ifnes' directive"); 5310 } 5311 5312 StringRef String1 = getTok().getStringContents(); 5313 Lex(); 5314 5315 if (Lexer.isNot(AsmToken::Comma)) { 5316 if (ExpectEqual) 5317 return TokError( 5318 "expected comma after first string for '.ifeqs' directive"); 5319 return TokError("expected comma after first string for '.ifnes' directive"); 5320 } 5321 5322 Lex(); 5323 5324 if (Lexer.isNot(AsmToken::String)) { 5325 if (ExpectEqual) 5326 return TokError("expected string parameter for '.ifeqs' directive"); 5327 return TokError("expected string parameter for '.ifnes' directive"); 5328 } 5329 5330 StringRef String2 = getTok().getStringContents(); 5331 Lex(); 5332 5333 TheCondStack.push_back(TheCondState); 5334 TheCondState.TheCond = AsmCond::IfCond; 5335 TheCondState.CondMet = ExpectEqual == (String1 == String2); 5336 TheCondState.Ignore = !TheCondState.CondMet; 5337 5338 return false; 5339 } 5340 5341 /// parseDirectiveIfdef 5342 /// ::= .ifdef symbol 5343 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) { 5344 StringRef Name; 5345 TheCondStack.push_back(TheCondState); 5346 TheCondState.TheCond = AsmCond::IfCond; 5347 5348 if (TheCondState.Ignore) { 5349 eatToEndOfStatement(); 5350 } else { 5351 if (check(parseIdentifier(Name), "expected identifier after '.ifdef'") || 5352 parseEOL()) 5353 return true; 5354 5355 MCSymbol *Sym = getContext().lookupSymbol(Name); 5356 5357 if (expect_defined) 5358 TheCondState.CondMet = (Sym && !Sym->isUndefined(false)); 5359 else 5360 TheCondState.CondMet = (!Sym || Sym->isUndefined(false)); 5361 TheCondState.Ignore = !TheCondState.CondMet; 5362 } 5363 5364 return false; 5365 } 5366 5367 /// parseDirectiveElseIf 5368 /// ::= .elseif expression 5369 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) { 5370 if (TheCondState.TheCond != AsmCond::IfCond && 5371 TheCondState.TheCond != AsmCond::ElseIfCond) 5372 return Error(DirectiveLoc, "Encountered a .elseif that doesn't follow an" 5373 " .if or an .elseif"); 5374 TheCondState.TheCond = AsmCond::ElseIfCond; 5375 5376 bool LastIgnoreState = false; 5377 if (!TheCondStack.empty()) 5378 LastIgnoreState = TheCondStack.back().Ignore; 5379 if (LastIgnoreState || TheCondState.CondMet) { 5380 TheCondState.Ignore = true; 5381 eatToEndOfStatement(); 5382 } else { 5383 int64_t ExprValue; 5384 if (parseAbsoluteExpression(ExprValue)) 5385 return true; 5386 5387 if (parseEOL()) 5388 return true; 5389 5390 TheCondState.CondMet = ExprValue; 5391 TheCondState.Ignore = !TheCondState.CondMet; 5392 } 5393 5394 return false; 5395 } 5396 5397 /// parseDirectiveElse 5398 /// ::= .else 5399 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) { 5400 if (parseEOL()) 5401 return true; 5402 5403 if (TheCondState.TheCond != AsmCond::IfCond && 5404 TheCondState.TheCond != AsmCond::ElseIfCond) 5405 return Error(DirectiveLoc, "Encountered a .else that doesn't follow " 5406 " an .if or an .elseif"); 5407 TheCondState.TheCond = AsmCond::ElseCond; 5408 bool LastIgnoreState = false; 5409 if (!TheCondStack.empty()) 5410 LastIgnoreState = TheCondStack.back().Ignore; 5411 if (LastIgnoreState || TheCondState.CondMet) 5412 TheCondState.Ignore = true; 5413 else 5414 TheCondState.Ignore = false; 5415 5416 return false; 5417 } 5418 5419 /// parseDirectiveEnd 5420 /// ::= .end 5421 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) { 5422 if (parseEOL()) 5423 return true; 5424 5425 while (Lexer.isNot(AsmToken::Eof)) 5426 Lexer.Lex(); 5427 5428 return false; 5429 } 5430 5431 /// parseDirectiveError 5432 /// ::= .err 5433 /// ::= .error [string] 5434 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) { 5435 if (!TheCondStack.empty()) { 5436 if (TheCondStack.back().Ignore) { 5437 eatToEndOfStatement(); 5438 return false; 5439 } 5440 } 5441 5442 if (!WithMessage) 5443 return Error(L, ".err encountered"); 5444 5445 StringRef Message = ".error directive invoked in source file"; 5446 if (Lexer.isNot(AsmToken::EndOfStatement)) { 5447 if (Lexer.isNot(AsmToken::String)) 5448 return TokError(".error argument must be a string"); 5449 5450 Message = getTok().getStringContents(); 5451 Lex(); 5452 } 5453 5454 return Error(L, Message); 5455 } 5456 5457 /// parseDirectiveWarning 5458 /// ::= .warning [string] 5459 bool AsmParser::parseDirectiveWarning(SMLoc L) { 5460 if (!TheCondStack.empty()) { 5461 if (TheCondStack.back().Ignore) { 5462 eatToEndOfStatement(); 5463 return false; 5464 } 5465 } 5466 5467 StringRef Message = ".warning directive invoked in source file"; 5468 5469 if (!parseOptionalToken(AsmToken::EndOfStatement)) { 5470 if (Lexer.isNot(AsmToken::String)) 5471 return TokError(".warning argument must be a string"); 5472 5473 Message = getTok().getStringContents(); 5474 Lex(); 5475 if (parseEOL()) 5476 return true; 5477 } 5478 5479 return Warning(L, Message); 5480 } 5481 5482 /// parseDirectiveEndIf 5483 /// ::= .endif 5484 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) { 5485 if (parseEOL()) 5486 return true; 5487 5488 if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty()) 5489 return Error(DirectiveLoc, "Encountered a .endif that doesn't follow " 5490 "an .if or .else"); 5491 if (!TheCondStack.empty()) { 5492 TheCondState = TheCondStack.back(); 5493 TheCondStack.pop_back(); 5494 } 5495 5496 return false; 5497 } 5498 5499 void AsmParser::initializeDirectiveKindMap() { 5500 /* Lookup will be done with the directive 5501 * converted to lower case, so all these 5502 * keys should be lower case. 5503 * (target specific directives are handled 5504 * elsewhere) 5505 */ 5506 DirectiveKindMap[".set"] = DK_SET; 5507 DirectiveKindMap[".equ"] = DK_EQU; 5508 DirectiveKindMap[".equiv"] = DK_EQUIV; 5509 DirectiveKindMap[".ascii"] = DK_ASCII; 5510 DirectiveKindMap[".asciz"] = DK_ASCIZ; 5511 DirectiveKindMap[".string"] = DK_STRING; 5512 DirectiveKindMap[".byte"] = DK_BYTE; 5513 DirectiveKindMap[".short"] = DK_SHORT; 5514 DirectiveKindMap[".value"] = DK_VALUE; 5515 DirectiveKindMap[".2byte"] = DK_2BYTE; 5516 DirectiveKindMap[".long"] = DK_LONG; 5517 DirectiveKindMap[".int"] = DK_INT; 5518 DirectiveKindMap[".4byte"] = DK_4BYTE; 5519 DirectiveKindMap[".quad"] = DK_QUAD; 5520 DirectiveKindMap[".8byte"] = DK_8BYTE; 5521 DirectiveKindMap[".octa"] = DK_OCTA; 5522 DirectiveKindMap[".single"] = DK_SINGLE; 5523 DirectiveKindMap[".float"] = DK_FLOAT; 5524 DirectiveKindMap[".double"] = DK_DOUBLE; 5525 DirectiveKindMap[".align"] = DK_ALIGN; 5526 DirectiveKindMap[".align32"] = DK_ALIGN32; 5527 DirectiveKindMap[".balign"] = DK_BALIGN; 5528 DirectiveKindMap[".balignw"] = DK_BALIGNW; 5529 DirectiveKindMap[".balignl"] = DK_BALIGNL; 5530 DirectiveKindMap[".p2align"] = DK_P2ALIGN; 5531 DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW; 5532 DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL; 5533 DirectiveKindMap[".org"] = DK_ORG; 5534 DirectiveKindMap[".fill"] = DK_FILL; 5535 DirectiveKindMap[".zero"] = DK_ZERO; 5536 DirectiveKindMap[".extern"] = DK_EXTERN; 5537 DirectiveKindMap[".globl"] = DK_GLOBL; 5538 DirectiveKindMap[".global"] = DK_GLOBAL; 5539 DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE; 5540 DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP; 5541 DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER; 5542 DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN; 5543 DirectiveKindMap[".reference"] = DK_REFERENCE; 5544 DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION; 5545 DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE; 5546 DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN; 5547 DirectiveKindMap[".cold"] = DK_COLD; 5548 DirectiveKindMap[".comm"] = DK_COMM; 5549 DirectiveKindMap[".common"] = DK_COMMON; 5550 DirectiveKindMap[".lcomm"] = DK_LCOMM; 5551 DirectiveKindMap[".abort"] = DK_ABORT; 5552 DirectiveKindMap[".include"] = DK_INCLUDE; 5553 DirectiveKindMap[".incbin"] = DK_INCBIN; 5554 DirectiveKindMap[".code16"] = DK_CODE16; 5555 DirectiveKindMap[".code16gcc"] = DK_CODE16GCC; 5556 DirectiveKindMap[".rept"] = DK_REPT; 5557 DirectiveKindMap[".rep"] = DK_REPT; 5558 DirectiveKindMap[".irp"] = DK_IRP; 5559 DirectiveKindMap[".irpc"] = DK_IRPC; 5560 DirectiveKindMap[".endr"] = DK_ENDR; 5561 DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE; 5562 DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK; 5563 DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK; 5564 DirectiveKindMap[".if"] = DK_IF; 5565 DirectiveKindMap[".ifeq"] = DK_IFEQ; 5566 DirectiveKindMap[".ifge"] = DK_IFGE; 5567 DirectiveKindMap[".ifgt"] = DK_IFGT; 5568 DirectiveKindMap[".ifle"] = DK_IFLE; 5569 DirectiveKindMap[".iflt"] = DK_IFLT; 5570 DirectiveKindMap[".ifne"] = DK_IFNE; 5571 DirectiveKindMap[".ifb"] = DK_IFB; 5572 DirectiveKindMap[".ifnb"] = DK_IFNB; 5573 DirectiveKindMap[".ifc"] = DK_IFC; 5574 DirectiveKindMap[".ifeqs"] = DK_IFEQS; 5575 DirectiveKindMap[".ifnc"] = DK_IFNC; 5576 DirectiveKindMap[".ifnes"] = DK_IFNES; 5577 DirectiveKindMap[".ifdef"] = DK_IFDEF; 5578 DirectiveKindMap[".ifndef"] = DK_IFNDEF; 5579 DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF; 5580 DirectiveKindMap[".elseif"] = DK_ELSEIF; 5581 DirectiveKindMap[".else"] = DK_ELSE; 5582 DirectiveKindMap[".end"] = DK_END; 5583 DirectiveKindMap[".endif"] = DK_ENDIF; 5584 DirectiveKindMap[".skip"] = DK_SKIP; 5585 DirectiveKindMap[".space"] = DK_SPACE; 5586 DirectiveKindMap[".file"] = DK_FILE; 5587 DirectiveKindMap[".line"] = DK_LINE; 5588 DirectiveKindMap[".loc"] = DK_LOC; 5589 DirectiveKindMap[".loc_label"] = DK_LOC_LABEL; 5590 DirectiveKindMap[".stabs"] = DK_STABS; 5591 DirectiveKindMap[".cv_file"] = DK_CV_FILE; 5592 DirectiveKindMap[".cv_func_id"] = DK_CV_FUNC_ID; 5593 DirectiveKindMap[".cv_loc"] = DK_CV_LOC; 5594 DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE; 5595 DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE; 5596 DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID; 5597 DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE; 5598 DirectiveKindMap[".cv_string"] = DK_CV_STRING; 5599 DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE; 5600 DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS; 5601 DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET; 5602 DirectiveKindMap[".cv_fpo_data"] = DK_CV_FPO_DATA; 5603 DirectiveKindMap[".sleb128"] = DK_SLEB128; 5604 DirectiveKindMap[".uleb128"] = DK_ULEB128; 5605 DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS; 5606 DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC; 5607 DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC; 5608 DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA; 5609 DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET; 5610 DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET; 5611 DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER; 5612 DirectiveKindMap[".cfi_llvm_def_aspace_cfa"] = DK_CFI_LLVM_DEF_ASPACE_CFA; 5613 DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET; 5614 DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET; 5615 DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY; 5616 DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA; 5617 DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE; 5618 DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE; 5619 DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE; 5620 DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE; 5621 DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE; 5622 DirectiveKindMap[".cfi_return_column"] = DK_CFI_RETURN_COLUMN; 5623 DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME; 5624 DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED; 5625 DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER; 5626 DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE; 5627 DirectiveKindMap[".cfi_label"] = DK_CFI_LABEL; 5628 DirectiveKindMap[".cfi_b_key_frame"] = DK_CFI_B_KEY_FRAME; 5629 DirectiveKindMap[".cfi_mte_tagged_frame"] = DK_CFI_MTE_TAGGED_FRAME; 5630 DirectiveKindMap[".cfi_val_offset"] = DK_CFI_VAL_OFFSET; 5631 DirectiveKindMap[".macros_on"] = DK_MACROS_ON; 5632 DirectiveKindMap[".macros_off"] = DK_MACROS_OFF; 5633 DirectiveKindMap[".macro"] = DK_MACRO; 5634 DirectiveKindMap[".exitm"] = DK_EXITM; 5635 DirectiveKindMap[".endm"] = DK_ENDM; 5636 DirectiveKindMap[".endmacro"] = DK_ENDMACRO; 5637 DirectiveKindMap[".purgem"] = DK_PURGEM; 5638 DirectiveKindMap[".err"] = DK_ERR; 5639 DirectiveKindMap[".error"] = DK_ERROR; 5640 DirectiveKindMap[".warning"] = DK_WARNING; 5641 DirectiveKindMap[".altmacro"] = DK_ALTMACRO; 5642 DirectiveKindMap[".noaltmacro"] = DK_NOALTMACRO; 5643 DirectiveKindMap[".reloc"] = DK_RELOC; 5644 DirectiveKindMap[".dc"] = DK_DC; 5645 DirectiveKindMap[".dc.a"] = DK_DC_A; 5646 DirectiveKindMap[".dc.b"] = DK_DC_B; 5647 DirectiveKindMap[".dc.d"] = DK_DC_D; 5648 DirectiveKindMap[".dc.l"] = DK_DC_L; 5649 DirectiveKindMap[".dc.s"] = DK_DC_S; 5650 DirectiveKindMap[".dc.w"] = DK_DC_W; 5651 DirectiveKindMap[".dc.x"] = DK_DC_X; 5652 DirectiveKindMap[".dcb"] = DK_DCB; 5653 DirectiveKindMap[".dcb.b"] = DK_DCB_B; 5654 DirectiveKindMap[".dcb.d"] = DK_DCB_D; 5655 DirectiveKindMap[".dcb.l"] = DK_DCB_L; 5656 DirectiveKindMap[".dcb.s"] = DK_DCB_S; 5657 DirectiveKindMap[".dcb.w"] = DK_DCB_W; 5658 DirectiveKindMap[".dcb.x"] = DK_DCB_X; 5659 DirectiveKindMap[".ds"] = DK_DS; 5660 DirectiveKindMap[".ds.b"] = DK_DS_B; 5661 DirectiveKindMap[".ds.d"] = DK_DS_D; 5662 DirectiveKindMap[".ds.l"] = DK_DS_L; 5663 DirectiveKindMap[".ds.p"] = DK_DS_P; 5664 DirectiveKindMap[".ds.s"] = DK_DS_S; 5665 DirectiveKindMap[".ds.w"] = DK_DS_W; 5666 DirectiveKindMap[".ds.x"] = DK_DS_X; 5667 DirectiveKindMap[".print"] = DK_PRINT; 5668 DirectiveKindMap[".addrsig"] = DK_ADDRSIG; 5669 DirectiveKindMap[".addrsig_sym"] = DK_ADDRSIG_SYM; 5670 DirectiveKindMap[".pseudoprobe"] = DK_PSEUDO_PROBE; 5671 DirectiveKindMap[".lto_discard"] = DK_LTO_DISCARD; 5672 DirectiveKindMap[".lto_set_conditional"] = DK_LTO_SET_CONDITIONAL; 5673 DirectiveKindMap[".memtag"] = DK_MEMTAG; 5674 } 5675 5676 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) { 5677 AsmToken EndToken, StartToken = getTok(); 5678 5679 unsigned NestLevel = 0; 5680 while (true) { 5681 // Check whether we have reached the end of the file. 5682 if (getLexer().is(AsmToken::Eof)) { 5683 printError(DirectiveLoc, "no matching '.endr' in definition"); 5684 return nullptr; 5685 } 5686 5687 if (Lexer.is(AsmToken::Identifier)) { 5688 StringRef Ident = getTok().getIdentifier(); 5689 if (Ident == ".rep" || Ident == ".rept" || Ident == ".irp" || 5690 Ident == ".irpc") { 5691 ++NestLevel; 5692 } else if (Ident == ".endr") { 5693 if (NestLevel == 0) { 5694 EndToken = getTok(); 5695 Lex(); 5696 if (Lexer.is(AsmToken::EndOfStatement)) 5697 break; 5698 printError(getTok().getLoc(), "expected newline"); 5699 return nullptr; 5700 } 5701 --NestLevel; 5702 } 5703 } 5704 5705 // Otherwise, scan till the end of the statement. 5706 eatToEndOfStatement(); 5707 } 5708 5709 const char *BodyStart = StartToken.getLoc().getPointer(); 5710 const char *BodyEnd = EndToken.getLoc().getPointer(); 5711 StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart); 5712 5713 // We Are Anonymous. 5714 MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters()); 5715 return &MacroLikeBodies.back(); 5716 } 5717 5718 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc, 5719 raw_svector_ostream &OS) { 5720 OS << ".endr\n"; 5721 5722 std::unique_ptr<MemoryBuffer> Instantiation = 5723 MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>"); 5724 5725 // Create the macro instantiation object and add to the current macro 5726 // instantiation stack. 5727 MacroInstantiation *MI = new MacroInstantiation{ 5728 DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()}; 5729 ActiveMacros.push_back(MI); 5730 5731 // Jump to the macro instantiation and prime the lexer. 5732 CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc()); 5733 Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer()); 5734 Lex(); 5735 } 5736 5737 /// parseDirectiveRept 5738 /// ::= .rep | .rept count 5739 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) { 5740 const MCExpr *CountExpr; 5741 SMLoc CountLoc = getTok().getLoc(); 5742 if (parseExpression(CountExpr)) 5743 return true; 5744 5745 int64_t Count; 5746 if (!CountExpr->evaluateAsAbsolute(Count, getStreamer().getAssemblerPtr())) { 5747 return Error(CountLoc, "unexpected token in '" + Dir + "' directive"); 5748 } 5749 5750 if (check(Count < 0, CountLoc, "Count is negative") || parseEOL()) 5751 return true; 5752 5753 // Lex the rept definition. 5754 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5755 if (!M) 5756 return true; 5757 5758 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5759 // to hold the macro body with substitutions. 5760 SmallString<256> Buf; 5761 raw_svector_ostream OS(Buf); 5762 while (Count--) { 5763 // Note that the AtPseudoVariable is disabled for instantiations of .rep(t). 5764 if (expandMacro(OS, *M, {}, {}, false)) 5765 return true; 5766 } 5767 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5768 5769 return false; 5770 } 5771 5772 /// parseDirectiveIrp 5773 /// ::= .irp symbol,values 5774 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) { 5775 MCAsmMacroParameter Parameter; 5776 MCAsmMacroArguments A; 5777 if (check(parseIdentifier(Parameter.Name), 5778 "expected identifier in '.irp' directive") || 5779 parseComma() || parseMacroArguments(nullptr, A) || parseEOL()) 5780 return true; 5781 5782 // Lex the irp definition. 5783 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5784 if (!M) 5785 return true; 5786 5787 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5788 // to hold the macro body with substitutions. 5789 SmallString<256> Buf; 5790 raw_svector_ostream OS(Buf); 5791 5792 for (const MCAsmMacroArgument &Arg : A) { 5793 // Note that the AtPseudoVariable is enabled for instantiations of .irp. 5794 // This is undocumented, but GAS seems to support it. 5795 if (expandMacro(OS, *M, Parameter, Arg, true)) 5796 return true; 5797 } 5798 5799 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5800 5801 return false; 5802 } 5803 5804 /// parseDirectiveIrpc 5805 /// ::= .irpc symbol,values 5806 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) { 5807 MCAsmMacroParameter Parameter; 5808 MCAsmMacroArguments A; 5809 5810 if (check(parseIdentifier(Parameter.Name), 5811 "expected identifier in '.irpc' directive") || 5812 parseComma() || parseMacroArguments(nullptr, A)) 5813 return true; 5814 5815 if (A.size() != 1 || A.front().size() != 1) 5816 return TokError("unexpected token in '.irpc' directive"); 5817 if (parseEOL()) 5818 return true; 5819 5820 // Lex the irpc definition. 5821 MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc); 5822 if (!M) 5823 return true; 5824 5825 // Macro instantiation is lexical, unfortunately. We construct a new buffer 5826 // to hold the macro body with substitutions. 5827 SmallString<256> Buf; 5828 raw_svector_ostream OS(Buf); 5829 5830 StringRef Values = A[0][0].is(AsmToken::String) ? A[0][0].getStringContents() 5831 : A[0][0].getString(); 5832 for (std::size_t I = 0, End = Values.size(); I != End; ++I) { 5833 MCAsmMacroArgument Arg; 5834 Arg.emplace_back(AsmToken::Identifier, Values.substr(I, 1)); 5835 5836 // Note that the AtPseudoVariable is enabled for instantiations of .irpc. 5837 // This is undocumented, but GAS seems to support it. 5838 if (expandMacro(OS, *M, Parameter, Arg, true)) 5839 return true; 5840 } 5841 5842 instantiateMacroLikeBody(M, DirectiveLoc, OS); 5843 5844 return false; 5845 } 5846 5847 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) { 5848 if (ActiveMacros.empty()) 5849 return TokError("unmatched '.endr' directive"); 5850 5851 // The only .repl that should get here are the ones created by 5852 // instantiateMacroLikeBody. 5853 assert(getLexer().is(AsmToken::EndOfStatement)); 5854 5855 handleMacroExit(); 5856 return false; 5857 } 5858 5859 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info, 5860 size_t Len) { 5861 const MCExpr *Value; 5862 SMLoc ExprLoc = getLexer().getLoc(); 5863 if (parseExpression(Value)) 5864 return true; 5865 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5866 if (!MCE) 5867 return Error(ExprLoc, "unexpected expression in _emit"); 5868 uint64_t IntValue = MCE->getValue(); 5869 if (!isUInt<8>(IntValue) && !isInt<8>(IntValue)) 5870 return Error(ExprLoc, "literal value out of range for directive"); 5871 5872 Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len); 5873 return false; 5874 } 5875 5876 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) { 5877 const MCExpr *Value; 5878 SMLoc ExprLoc = getLexer().getLoc(); 5879 if (parseExpression(Value)) 5880 return true; 5881 const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value); 5882 if (!MCE) 5883 return Error(ExprLoc, "unexpected expression in align"); 5884 uint64_t IntValue = MCE->getValue(); 5885 if (!isPowerOf2_64(IntValue)) 5886 return Error(ExprLoc, "literal value not a power of two greater then zero"); 5887 5888 Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue)); 5889 return false; 5890 } 5891 5892 bool AsmParser::parseDirectivePrint(SMLoc DirectiveLoc) { 5893 const AsmToken StrTok = getTok(); 5894 Lex(); 5895 if (StrTok.isNot(AsmToken::String) || StrTok.getString().front() != '"') 5896 return Error(DirectiveLoc, "expected double quoted string after .print"); 5897 if (parseEOL()) 5898 return true; 5899 llvm::outs() << StrTok.getStringContents() << '\n'; 5900 return false; 5901 } 5902 5903 bool AsmParser::parseDirectiveAddrsig() { 5904 if (parseEOL()) 5905 return true; 5906 getStreamer().emitAddrsig(); 5907 return false; 5908 } 5909 5910 bool AsmParser::parseDirectiveAddrsigSym() { 5911 StringRef Name; 5912 if (check(parseIdentifier(Name), "expected identifier") || parseEOL()) 5913 return true; 5914 MCSymbol *Sym = getContext().getOrCreateSymbol(Name); 5915 getStreamer().emitAddrsigSym(Sym); 5916 return false; 5917 } 5918 5919 bool AsmParser::parseDirectivePseudoProbe() { 5920 int64_t Guid; 5921 int64_t Index; 5922 int64_t Type; 5923 int64_t Attr; 5924 int64_t Discriminator = 0; 5925 5926 if (parseIntToken(Guid, "unexpected token in '.pseudoprobe' directive")) 5927 return true; 5928 5929 if (parseIntToken(Index, "unexpected token in '.pseudoprobe' directive")) 5930 return true; 5931 5932 if (parseIntToken(Type, "unexpected token in '.pseudoprobe' directive")) 5933 return true; 5934 5935 if (parseIntToken(Attr, "unexpected token in '.pseudoprobe' directive")) 5936 return true; 5937 5938 if (hasDiscriminator(Attr)) { 5939 if (parseIntToken(Discriminator, 5940 "unexpected token in '.pseudoprobe' directive")) 5941 return true; 5942 } 5943 5944 // Parse inline stack like @ GUID:11:12 @ GUID:1:11 @ GUID:3:21 5945 MCPseudoProbeInlineStack InlineStack; 5946 5947 while (getLexer().is(AsmToken::At)) { 5948 // eat @ 5949 Lex(); 5950 5951 int64_t CallerGuid = 0; 5952 if (getLexer().is(AsmToken::Integer)) { 5953 if (parseIntToken(CallerGuid, 5954 "unexpected token in '.pseudoprobe' directive")) 5955 return true; 5956 } 5957 5958 // eat colon 5959 if (getLexer().is(AsmToken::Colon)) 5960 Lex(); 5961 5962 int64_t CallerProbeId = 0; 5963 if (getLexer().is(AsmToken::Integer)) { 5964 if (parseIntToken(CallerProbeId, 5965 "unexpected token in '.pseudoprobe' directive")) 5966 return true; 5967 } 5968 5969 InlineSite Site(CallerGuid, CallerProbeId); 5970 InlineStack.push_back(Site); 5971 } 5972 5973 // Parse function entry name 5974 StringRef FnName; 5975 if (parseIdentifier(FnName)) 5976 return Error(getLexer().getLoc(), "unexpected token in '.pseudoprobe' directive"); 5977 MCSymbol *FnSym = getContext().lookupSymbol(FnName); 5978 5979 if (parseEOL()) 5980 return true; 5981 5982 getStreamer().emitPseudoProbe(Guid, Index, Type, Attr, Discriminator, 5983 InlineStack, FnSym); 5984 return false; 5985 } 5986 5987 /// parseDirectiveLTODiscard 5988 /// ::= ".lto_discard" [ identifier ( , identifier )* ] 5989 /// The LTO library emits this directive to discard non-prevailing symbols. 5990 /// We ignore symbol assignments and attribute changes for the specified 5991 /// symbols. 5992 bool AsmParser::parseDirectiveLTODiscard() { 5993 auto ParseOp = [&]() -> bool { 5994 StringRef Name; 5995 SMLoc Loc = getTok().getLoc(); 5996 if (parseIdentifier(Name)) 5997 return Error(Loc, "expected identifier"); 5998 LTODiscardSymbols.insert(Name); 5999 return false; 6000 }; 6001 6002 LTODiscardSymbols.clear(); 6003 return parseMany(ParseOp); 6004 } 6005 6006 // We are comparing pointers, but the pointers are relative to a single string. 6007 // Thus, this should always be deterministic. 6008 static int rewritesSort(const AsmRewrite *AsmRewriteA, 6009 const AsmRewrite *AsmRewriteB) { 6010 if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer()) 6011 return -1; 6012 if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer()) 6013 return 1; 6014 6015 // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output 6016 // rewrite to the same location. Make sure the SizeDirective rewrite is 6017 // performed first, then the Imm/ImmPrefix and finally the Input/Output. This 6018 // ensures the sort algorithm is stable. 6019 if (AsmRewritePrecedence[AsmRewriteA->Kind] > 6020 AsmRewritePrecedence[AsmRewriteB->Kind]) 6021 return -1; 6022 6023 if (AsmRewritePrecedence[AsmRewriteA->Kind] < 6024 AsmRewritePrecedence[AsmRewriteB->Kind]) 6025 return 1; 6026 llvm_unreachable("Unstable rewrite sort."); 6027 } 6028 6029 bool AsmParser::parseMSInlineAsm( 6030 std::string &AsmString, unsigned &NumOutputs, unsigned &NumInputs, 6031 SmallVectorImpl<std::pair<void *, bool>> &OpDecls, 6032 SmallVectorImpl<std::string> &Constraints, 6033 SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII, 6034 MCInstPrinter *IP, MCAsmParserSemaCallback &SI) { 6035 SmallVector<void *, 4> InputDecls; 6036 SmallVector<void *, 4> OutputDecls; 6037 SmallVector<bool, 4> InputDeclsAddressOf; 6038 SmallVector<bool, 4> OutputDeclsAddressOf; 6039 SmallVector<std::string, 4> InputConstraints; 6040 SmallVector<std::string, 4> OutputConstraints; 6041 SmallVector<MCRegister, 4> ClobberRegs; 6042 6043 SmallVector<AsmRewrite, 4> AsmStrRewrites; 6044 6045 // Prime the lexer. 6046 Lex(); 6047 6048 // While we have input, parse each statement. 6049 unsigned InputIdx = 0; 6050 unsigned OutputIdx = 0; 6051 while (getLexer().isNot(AsmToken::Eof)) { 6052 // Parse curly braces marking block start/end 6053 if (parseCurlyBlockScope(AsmStrRewrites)) 6054 continue; 6055 6056 ParseStatementInfo Info(&AsmStrRewrites); 6057 bool StatementErr = parseStatement(Info, &SI); 6058 6059 if (StatementErr || Info.ParseError) { 6060 // Emit pending errors if any exist. 6061 printPendingErrors(); 6062 return true; 6063 } 6064 6065 // No pending error should exist here. 6066 assert(!hasPendingError() && "unexpected error from parseStatement"); 6067 6068 if (Info.Opcode == ~0U) 6069 continue; 6070 6071 const MCInstrDesc &Desc = MII->get(Info.Opcode); 6072 6073 // Build the list of clobbers, outputs and inputs. 6074 for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) { 6075 MCParsedAsmOperand &Operand = *Info.ParsedOperands[i]; 6076 6077 // Register operand. 6078 if (Operand.isReg() && !Operand.needAddressOf() && 6079 !getTargetParser().omitRegisterFromClobberLists(Operand.getReg())) { 6080 unsigned NumDefs = Desc.getNumDefs(); 6081 // Clobber. 6082 if (NumDefs && Operand.getMCOperandNum() < NumDefs) 6083 ClobberRegs.push_back(Operand.getReg()); 6084 continue; 6085 } 6086 6087 // Expr/Input or Output. 6088 StringRef SymName = Operand.getSymName(); 6089 if (SymName.empty()) 6090 continue; 6091 6092 void *OpDecl = Operand.getOpDecl(); 6093 if (!OpDecl) 6094 continue; 6095 6096 StringRef Constraint = Operand.getConstraint(); 6097 if (Operand.isImm()) { 6098 // Offset as immediate 6099 if (Operand.isOffsetOfLocal()) 6100 Constraint = "r"; 6101 else 6102 Constraint = "i"; 6103 } 6104 6105 bool isOutput = (i == 1) && Desc.mayStore(); 6106 bool Restricted = Operand.isMemUseUpRegs(); 6107 SMLoc Start = SMLoc::getFromPointer(SymName.data()); 6108 if (isOutput) { 6109 ++InputIdx; 6110 OutputDecls.push_back(OpDecl); 6111 OutputDeclsAddressOf.push_back(Operand.needAddressOf()); 6112 OutputConstraints.push_back(("=" + Constraint).str()); 6113 AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size(), 0, 6114 Restricted); 6115 } else { 6116 InputDecls.push_back(OpDecl); 6117 InputDeclsAddressOf.push_back(Operand.needAddressOf()); 6118 InputConstraints.push_back(Constraint.str()); 6119 if (Desc.operands()[i - 1].isBranchTarget()) 6120 AsmStrRewrites.emplace_back(AOK_CallInput, Start, SymName.size(), 0, 6121 Restricted); 6122 else 6123 AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size(), 0, 6124 Restricted); 6125 } 6126 } 6127 6128 // Consider implicit defs to be clobbers. Think of cpuid and push. 6129 llvm::append_range(ClobberRegs, Desc.implicit_defs()); 6130 } 6131 6132 // Set the number of Outputs and Inputs. 6133 NumOutputs = OutputDecls.size(); 6134 NumInputs = InputDecls.size(); 6135 6136 // Set the unique clobbers. 6137 array_pod_sort(ClobberRegs.begin(), ClobberRegs.end()); 6138 ClobberRegs.erase(llvm::unique(ClobberRegs), ClobberRegs.end()); 6139 Clobbers.assign(ClobberRegs.size(), std::string()); 6140 for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) { 6141 raw_string_ostream OS(Clobbers[I]); 6142 IP->printRegName(OS, ClobberRegs[I]); 6143 } 6144 6145 // Merge the various outputs and inputs. Output are expected first. 6146 if (NumOutputs || NumInputs) { 6147 unsigned NumExprs = NumOutputs + NumInputs; 6148 OpDecls.resize(NumExprs); 6149 Constraints.resize(NumExprs); 6150 for (unsigned i = 0; i < NumOutputs; ++i) { 6151 OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]); 6152 Constraints[i] = OutputConstraints[i]; 6153 } 6154 for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) { 6155 OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]); 6156 Constraints[j] = InputConstraints[i]; 6157 } 6158 } 6159 6160 // Build the IR assembly string. 6161 std::string AsmStringIR; 6162 raw_string_ostream OS(AsmStringIR); 6163 StringRef ASMString = 6164 SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer(); 6165 const char *AsmStart = ASMString.begin(); 6166 const char *AsmEnd = ASMString.end(); 6167 array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort); 6168 for (auto I = AsmStrRewrites.begin(), E = AsmStrRewrites.end(); I != E; ++I) { 6169 const AsmRewrite &AR = *I; 6170 // Check if this has already been covered by another rewrite... 6171 if (AR.Done) 6172 continue; 6173 AsmRewriteKind Kind = AR.Kind; 6174 6175 const char *Loc = AR.Loc.getPointer(); 6176 assert(Loc >= AsmStart && "Expected Loc to be at or after Start!"); 6177 6178 // Emit everything up to the immediate/expression. 6179 if (unsigned Len = Loc - AsmStart) 6180 OS << StringRef(AsmStart, Len); 6181 6182 // Skip the original expression. 6183 if (Kind == AOK_Skip) { 6184 AsmStart = Loc + AR.Len; 6185 continue; 6186 } 6187 6188 unsigned AdditionalSkip = 0; 6189 // Rewrite expressions in $N notation. 6190 switch (Kind) { 6191 default: 6192 break; 6193 case AOK_IntelExpr: 6194 assert(AR.IntelExp.isValid() && "cannot write invalid intel expression"); 6195 if (AR.IntelExp.NeedBracs) 6196 OS << "["; 6197 if (AR.IntelExp.hasBaseReg()) 6198 OS << AR.IntelExp.BaseReg; 6199 if (AR.IntelExp.hasIndexReg()) 6200 OS << (AR.IntelExp.hasBaseReg() ? " + " : "") 6201 << AR.IntelExp.IndexReg; 6202 if (AR.IntelExp.Scale > 1) 6203 OS << " * $$" << AR.IntelExp.Scale; 6204 if (AR.IntelExp.hasOffset()) { 6205 if (AR.IntelExp.hasRegs()) 6206 OS << " + "; 6207 // Fuse this rewrite with a rewrite of the offset name, if present. 6208 StringRef OffsetName = AR.IntelExp.OffsetName; 6209 SMLoc OffsetLoc = SMLoc::getFromPointer(AR.IntelExp.OffsetName.data()); 6210 size_t OffsetLen = OffsetName.size(); 6211 auto rewrite_it = std::find_if( 6212 I, AsmStrRewrites.end(), [&](const AsmRewrite &FusingAR) { 6213 return FusingAR.Loc == OffsetLoc && FusingAR.Len == OffsetLen && 6214 (FusingAR.Kind == AOK_Input || 6215 FusingAR.Kind == AOK_CallInput); 6216 }); 6217 if (rewrite_it == AsmStrRewrites.end()) { 6218 OS << "offset " << OffsetName; 6219 } else if (rewrite_it->Kind == AOK_CallInput) { 6220 OS << "${" << InputIdx++ << ":P}"; 6221 rewrite_it->Done = true; 6222 } else { 6223 OS << '$' << InputIdx++; 6224 rewrite_it->Done = true; 6225 } 6226 } 6227 if (AR.IntelExp.Imm || AR.IntelExp.emitImm()) 6228 OS << (AR.IntelExp.emitImm() ? "$$" : " + $$") << AR.IntelExp.Imm; 6229 if (AR.IntelExp.NeedBracs) 6230 OS << "]"; 6231 break; 6232 case AOK_Label: 6233 OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label; 6234 break; 6235 case AOK_Input: 6236 if (AR.IntelExpRestricted) 6237 OS << "${" << InputIdx++ << ":P}"; 6238 else 6239 OS << '$' << InputIdx++; 6240 break; 6241 case AOK_CallInput: 6242 OS << "${" << InputIdx++ << ":P}"; 6243 break; 6244 case AOK_Output: 6245 if (AR.IntelExpRestricted) 6246 OS << "${" << OutputIdx++ << ":P}"; 6247 else 6248 OS << '$' << OutputIdx++; 6249 break; 6250 case AOK_SizeDirective: 6251 switch (AR.Val) { 6252 default: break; 6253 case 8: OS << "byte ptr "; break; 6254 case 16: OS << "word ptr "; break; 6255 case 32: OS << "dword ptr "; break; 6256 case 64: OS << "qword ptr "; break; 6257 case 80: OS << "xword ptr "; break; 6258 case 128: OS << "xmmword ptr "; break; 6259 case 256: OS << "ymmword ptr "; break; 6260 } 6261 break; 6262 case AOK_Emit: 6263 OS << ".byte"; 6264 break; 6265 case AOK_Align: { 6266 // MS alignment directives are measured in bytes. If the native assembler 6267 // measures alignment in bytes, we can pass it straight through. 6268 OS << ".align"; 6269 if (getContext().getAsmInfo()->getAlignmentIsInBytes()) 6270 break; 6271 6272 // Alignment is in log2 form, so print that instead and skip the original 6273 // immediate. 6274 unsigned Val = AR.Val; 6275 OS << ' ' << Val; 6276 assert(Val < 10 && "Expected alignment less then 2^10."); 6277 AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4; 6278 break; 6279 } 6280 case AOK_EVEN: 6281 OS << ".even"; 6282 break; 6283 case AOK_EndOfStatement: 6284 OS << "\n\t"; 6285 break; 6286 } 6287 6288 // Skip the original expression. 6289 AsmStart = Loc + AR.Len + AdditionalSkip; 6290 } 6291 6292 // Emit the remainder of the asm string. 6293 if (AsmStart != AsmEnd) 6294 OS << StringRef(AsmStart, AsmEnd - AsmStart); 6295 6296 AsmString = std::move(AsmStringIR); 6297 return false; 6298 } 6299 6300 bool HLASMAsmParser::parseAsHLASMLabel(ParseStatementInfo &Info, 6301 MCAsmParserSemaCallback *SI) { 6302 AsmToken LabelTok = getTok(); 6303 SMLoc LabelLoc = LabelTok.getLoc(); 6304 StringRef LabelVal; 6305 6306 if (parseIdentifier(LabelVal)) 6307 return Error(LabelLoc, "The HLASM Label has to be an Identifier"); 6308 6309 // We have validated whether the token is an Identifier. 6310 // Now we have to validate whether the token is a 6311 // valid HLASM Label. 6312 if (!getTargetParser().isLabel(LabelTok) || checkForValidSection()) 6313 return true; 6314 6315 // Lex leading spaces to get to the next operand. 6316 lexLeadingSpaces(); 6317 6318 // We shouldn't emit the label if there is nothing else after the label. 6319 // i.e asm("<token>\n") 6320 if (getTok().is(AsmToken::EndOfStatement)) 6321 return Error(LabelLoc, 6322 "Cannot have just a label for an HLASM inline asm statement"); 6323 6324 MCSymbol *Sym = getContext().getOrCreateSymbol( 6325 getContext().getAsmInfo()->isHLASM() ? LabelVal.upper() : LabelVal); 6326 6327 getTargetParser().doBeforeLabelEmit(Sym, LabelLoc); 6328 6329 // Emit the label. 6330 Out.emitLabel(Sym, LabelLoc); 6331 6332 // If we are generating dwarf for assembly source files then gather the 6333 // info to make a dwarf label entry for this label if needed. 6334 if (enabledGenDwarfForAssembly()) 6335 MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(), 6336 LabelLoc); 6337 6338 getTargetParser().onLabelParsed(Sym); 6339 6340 return false; 6341 } 6342 6343 bool HLASMAsmParser::parseAsMachineInstruction(ParseStatementInfo &Info, 6344 MCAsmParserSemaCallback *SI) { 6345 AsmToken OperationEntryTok = Lexer.getTok(); 6346 SMLoc OperationEntryLoc = OperationEntryTok.getLoc(); 6347 StringRef OperationEntryVal; 6348 6349 // Attempt to parse the first token as an Identifier 6350 if (parseIdentifier(OperationEntryVal)) 6351 return Error(OperationEntryLoc, "unexpected token at start of statement"); 6352 6353 // Once we've parsed the operation entry successfully, lex 6354 // any spaces to get to the OperandEntries. 6355 lexLeadingSpaces(); 6356 6357 return parseAndMatchAndEmitTargetInstruction( 6358 Info, OperationEntryVal, OperationEntryTok, OperationEntryLoc); 6359 } 6360 6361 bool HLASMAsmParser::parseStatement(ParseStatementInfo &Info, 6362 MCAsmParserSemaCallback *SI) { 6363 assert(!hasPendingError() && "parseStatement started with pending error"); 6364 6365 // Should the first token be interpreted as a HLASM Label. 6366 bool ShouldParseAsHLASMLabel = false; 6367 6368 // If a Name Entry exists, it should occur at the very 6369 // start of the string. In this case, we should parse the 6370 // first non-space token as a Label. 6371 // If the Name entry is missing (i.e. there's some other 6372 // token), then we attempt to parse the first non-space 6373 // token as a Machine Instruction. 6374 if (getTok().isNot(AsmToken::Space)) 6375 ShouldParseAsHLASMLabel = true; 6376 6377 // If we have an EndOfStatement (which includes the target's comment 6378 // string) we can appropriately lex it early on) 6379 if (Lexer.is(AsmToken::EndOfStatement)) { 6380 // if this is a line comment we can drop it safely 6381 if (getTok().getString().empty() || getTok().getString().front() == '\r' || 6382 getTok().getString().front() == '\n') 6383 Out.addBlankLine(); 6384 Lex(); 6385 return false; 6386 } 6387 6388 // We have established how to parse the inline asm statement. 6389 // Now we can safely lex any leading spaces to get to the 6390 // first token. 6391 lexLeadingSpaces(); 6392 6393 // If we see a new line or carriage return as the first operand, 6394 // after lexing leading spaces, emit the new line and lex the 6395 // EndOfStatement token. 6396 if (Lexer.is(AsmToken::EndOfStatement)) { 6397 if (getTok().getString().front() == '\n' || 6398 getTok().getString().front() == '\r') { 6399 Out.addBlankLine(); 6400 Lex(); 6401 return false; 6402 } 6403 } 6404 6405 // Handle the label first if we have to before processing the rest 6406 // of the tokens as a machine instruction. 6407 if (ShouldParseAsHLASMLabel) { 6408 // If there were any errors while handling and emitting the label, 6409 // early return. 6410 if (parseAsHLASMLabel(Info, SI)) { 6411 // If we know we've failed in parsing, simply eat until end of the 6412 // statement. This ensures that we don't process any other statements. 6413 eatToEndOfStatement(); 6414 return true; 6415 } 6416 } 6417 6418 return parseAsMachineInstruction(Info, SI); 6419 } 6420 6421 namespace llvm { 6422 namespace MCParserUtils { 6423 6424 bool parseAssignmentExpression(StringRef Name, bool allow_redef, 6425 MCAsmParser &Parser, MCSymbol *&Sym, 6426 const MCExpr *&Value) { 6427 6428 // FIXME: Use better location, we should use proper tokens. 6429 SMLoc EqualLoc = Parser.getTok().getLoc(); 6430 if (Parser.parseExpression(Value)) 6431 return Parser.TokError("missing expression"); 6432 6433 // Note: we don't count b as used in "a = b". This is to allow 6434 // a = b 6435 // b = c 6436 6437 if (Parser.parseEOL()) 6438 return true; 6439 6440 // Validate that the LHS is allowed to be a variable (either it has not been 6441 // used as a symbol, or it is an absolute symbol). 6442 Sym = Parser.getContext().lookupSymbol(Name); 6443 if (Sym) { 6444 // Diagnose assignment to a label. 6445 // 6446 // FIXME: Diagnostics. Note the location of the definition as a label. 6447 // FIXME: Diagnose assignment to protected identifier (e.g., register name). 6448 if (Value->isSymbolUsedInExpression(Sym)) 6449 return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'"); 6450 else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() && 6451 !Sym->isVariable()) 6452 ; // Allow redefinitions of undefined symbols only used in directives. 6453 else if (Sym->isVariable() && !Sym->isUsed() && allow_redef) 6454 ; // Allow redefinitions of variables that haven't yet been used. 6455 else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef)) 6456 return Parser.Error(EqualLoc, "redefinition of '" + Name + "'"); 6457 else if (!Sym->isVariable()) 6458 return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'"); 6459 else if (!isa<MCConstantExpr>(Sym->getVariableValue())) 6460 return Parser.Error(EqualLoc, 6461 "invalid reassignment of non-absolute variable '" + 6462 Name + "'"); 6463 } else if (Name == ".") { 6464 Parser.getStreamer().emitValueToOffset(Value, 0, EqualLoc); 6465 return false; 6466 } else 6467 Sym = Parser.getContext().getOrCreateSymbol(Name); 6468 6469 Sym->setRedefinable(allow_redef); 6470 6471 return false; 6472 } 6473 6474 } // end namespace MCParserUtils 6475 } // end namespace llvm 6476 6477 /// Create an MCAsmParser instance. 6478 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C, 6479 MCStreamer &Out, const MCAsmInfo &MAI, 6480 unsigned CB) { 6481 if (C.getTargetTriple().isSystemZ() && C.getTargetTriple().isOSzOS()) 6482 return new HLASMAsmParser(SM, C, Out, MAI, CB); 6483 6484 return new AsmParser(SM, C, Out, MAI, CB); 6485 } 6486