llvm/lib/MC/MCParser/AsmParser.cpp

   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 '$'|'*' may be a valid token in context of
1180       // the current PC.
1181       if (getTok().is(AsmToken::Dollar) || getTok().is(AsmToken::Star)) {
1182         bool ShouldGenerateTempSymbol = false;
1183         if ((getTok().is(AsmToken::Dollar) && MAI.getDollarIsPC()) ||
1184             (getTok().is(AsmToken::Star) && MAI.getStarIsPC()))
1185           ShouldGenerateTempSymbol = true;
1186
1187         if (!ShouldGenerateTempSymbol)
1188           return Error(FirstTokenLoc, "invalid token in expression");
1189
1190         // Eat the '$'|'*' 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(
1252           MAI.shouldEmitLabelsInUpperCase() ? SymbolName.upper() : 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.getDotIsPC())
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()->shouldEmitLabelsInUpperCase()
6326           ? LabelVal.upper()
6327           : LabelVal);
6328
6329   getTargetParser().doBeforeLabelEmit(Sym, LabelLoc);
6330
6331   // Emit the label.
6332   Out.emitLabel(Sym, LabelLoc);
6333
6334   // If we are generating dwarf for assembly source files then gather the
6335   // info to make a dwarf label entry for this label if needed.
6336   if (enabledGenDwarfForAssembly())
6337     MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
6338                                LabelLoc);
6339
6340   getTargetParser().onLabelParsed(Sym);
6341
6342   return false;
6343 }
6344
6345 bool HLASMAsmParser::parseAsMachineInstruction(ParseStatementInfo &Info,
6346                                                MCAsmParserSemaCallback *SI) {
6347   AsmToken OperationEntryTok = Lexer.getTok();
6348   SMLoc OperationEntryLoc = OperationEntryTok.getLoc();
6349   StringRef OperationEntryVal;
6350
6351   // Attempt to parse the first token as an Identifier
6352   if (parseIdentifier(OperationEntryVal))
6353     return Error(OperationEntryLoc, "unexpected token at start of statement");
6354
6355   // Once we've parsed the operation entry successfully, lex
6356   // any spaces to get to the OperandEntries.
6357   lexLeadingSpaces();
6358
6359   return parseAndMatchAndEmitTargetInstruction(
6360       Info, OperationEntryVal, OperationEntryTok, OperationEntryLoc);
6361 }
6362
6363 bool HLASMAsmParser::parseStatement(ParseStatementInfo &Info,
6364                                     MCAsmParserSemaCallback *SI) {
6365   assert(!hasPendingError() && "parseStatement started with pending error");
6366
6367   // Should the first token be interpreted as a HLASM Label.
6368   bool ShouldParseAsHLASMLabel = false;
6369
6370   // If a Name Entry exists, it should occur at the very
6371   // start of the string. In this case, we should parse the
6372   // first non-space token as a Label.
6373   // If the Name entry is missing (i.e. there's some other
6374   // token), then we attempt to parse the first non-space
6375   // token as a Machine Instruction.
6376   if (getTok().isNot(AsmToken::Space))
6377     ShouldParseAsHLASMLabel = true;
6378
6379   // If we have an EndOfStatement (which includes the target's comment
6380   // string) we can appropriately lex it early on)
6381   if (Lexer.is(AsmToken::EndOfStatement)) {
6382     // if this is a line comment we can drop it safely
6383     if (getTok().getString().empty() || getTok().getString().front() == '\r' ||
6384         getTok().getString().front() == '\n')
6385       Out.addBlankLine();
6386     Lex();
6387     return false;
6388   }
6389
6390   // We have established how to parse the inline asm statement.
6391   // Now we can safely lex any leading spaces to get to the
6392   // first token.
6393   lexLeadingSpaces();
6394
6395   // If we see a new line or carriage return as the first operand,
6396   // after lexing leading spaces, emit the new line and lex the
6397   // EndOfStatement token.
6398   if (Lexer.is(AsmToken::EndOfStatement)) {
6399     if (getTok().getString().front() == '\n' ||
6400         getTok().getString().front() == '\r') {
6401       Out.addBlankLine();
6402       Lex();
6403       return false;
6404     }
6405   }
6406
6407   // Handle the label first if we have to before processing the rest
6408   // of the tokens as a machine instruction.
6409   if (ShouldParseAsHLASMLabel) {
6410     // If there were any errors while handling and emitting the label,
6411     // early return.
6412     if (parseAsHLASMLabel(Info, SI)) {
6413       // If we know we've failed in parsing, simply eat until end of the
6414       // statement. This ensures that we don't process any other statements.
6415       eatToEndOfStatement();
6416       return true;
6417     }
6418   }
6419
6420   return parseAsMachineInstruction(Info, SI);
6421 }
6422
6423 namespace llvm {
6424 namespace MCParserUtils {
6425
6426 bool parseAssignmentExpression(StringRef Name, bool allow_redef,
6427                                MCAsmParser &Parser, MCSymbol *&Sym,
6428                                const MCExpr *&Value) {
6429
6430   // FIXME: Use better location, we should use proper tokens.
6431   SMLoc EqualLoc = Parser.getTok().getLoc();
6432   if (Parser.parseExpression(Value))
6433     return Parser.TokError("missing expression");
6434
6435   // Note: we don't count b as used in "a = b". This is to allow
6436   // a = b
6437   // b = c
6438
6439   if (Parser.parseEOL())
6440     return true;
6441
6442   // Validate that the LHS is allowed to be a variable (either it has not been
6443   // used as a symbol, or it is an absolute symbol).
6444   Sym = Parser.getContext().lookupSymbol(Name);
6445   if (Sym) {
6446     // Diagnose assignment to a label.
6447     //
6448     // FIXME: Diagnostics. Note the location of the definition as a label.
6449     // FIXME: Diagnose assignment to protected identifier (e.g., register name).
6450     if (Value->isSymbolUsedInExpression(Sym))
6451       return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'");
6452     else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() &&
6453              !Sym->isVariable())
6454       ; // Allow redefinitions of undefined symbols only used in directives.
6455     else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
6456       ; // Allow redefinitions of variables that haven't yet been used.
6457     else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
6458       return Parser.Error(EqualLoc, "redefinition of '" + Name + "'");
6459     else if (!Sym->isVariable())
6460       return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'");
6461     else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
6462       return Parser.Error(EqualLoc,
6463                           "invalid reassignment of non-absolute variable '" +
6464                               Name + "'");
6465   } else if (Name == ".") {
6466     Parser.getStreamer().emitValueToOffset(Value, 0, EqualLoc);
6467     return false;
6468   } else
6469     Sym = Parser.getContext().getOrCreateSymbol(Name);
6470
6471   Sym->setRedefinable(allow_redef);
6472
6473   return false;
6474 }
6475
6476 } // end namespace MCParserUtils
6477 } // end namespace llvm
6478
6479 /// Create an MCAsmParser instance.
6480 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
6481                                      MCStreamer &Out, const MCAsmInfo &MAI,
6482                                      unsigned CB) {
6483   if (C.getTargetTriple().isSystemZ() && C.getTargetTriple().isOSzOS())
6484     return new HLASMAsmParser(SM, C, Out, MAI, CB);
6485
6486   return new AsmParser(SM, C, Out, MAI, CB);
6487 }