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