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 the parser for assembly files.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/ADT/APFloat.h"
  14 #include "llvm/ADT/APInt.h"
  15 #include "llvm/ADT/ArrayRef.h"
  16 #include "llvm/ADT/None.h"
  17 #include "llvm/ADT/STLExtras.h"
  18 #include "llvm/ADT/SmallString.h"
  19 #include "llvm/ADT/SmallVector.h"
  20 #include "llvm/ADT/StringExtras.h"
  21 #include "llvm/ADT/StringMap.h"
  22 #include "llvm/ADT/StringRef.h"
  23 #include "llvm/ADT/Twine.h"
  24 #include "llvm/BinaryFormat/Dwarf.h"
  25 #include "llvm/MC/MCAsmInfo.h"
  26 #include "llvm/MC/MCCodeView.h"
  27 #include "llvm/MC/MCContext.h"
  28 #include "llvm/MC/MCDirectives.h"
  29 #include "llvm/MC/MCDwarf.h"
  30 #include "llvm/MC/MCExpr.h"
  31 #include "llvm/MC/MCInstPrinter.h"
  32 #include "llvm/MC/MCInstrDesc.h"
  33 #include "llvm/MC/MCInstrInfo.h"
  34 #include "llvm/MC/MCObjectFileInfo.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 <sstream>
  67 #include <string>
  68 #include <tuple>
  69 #include <utility>
  70 #include <vector>
  71
  72 using namespace llvm;
  73
  74 MCAsmParserSemaCallback::~MCAsmParserSemaCallback() = default;
  75
  76 static cl::opt<unsigned> AsmMacroMaxNestingDepth(
  77      "asm-macro-max-nesting-depth", cl::init(20), cl::Hidden,
  78      cl::desc("The maximum nesting depth allowed for assembly macros."));
  79
  80 namespace {
  81
  82 /// Helper types for tracking macro definitions.
  83 typedef std::vector<AsmToken> MCAsmMacroArgument;
  84 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
  85
  86 /// Helper class for storing information about an active macro
  87 /// instantiation.
  88 struct MacroInstantiation {
  89   /// The location of the instantiation.
  90   SMLoc InstantiationLoc;
  91
  92   /// The buffer where parsing should resume upon instantiation completion.
  93   int ExitBuffer;
  94
  95   /// The location where parsing should resume upon instantiation completion.
  96   SMLoc ExitLoc;
  97
  98   /// The depth of TheCondStack at the start of the instantiation.
  99   size_t CondStackDepth;
 100
 101 public:
 102   MacroInstantiation(SMLoc IL, int EB, SMLoc EL, size_t CondStackDepth);
 103 };
 104
 105 struct ParseStatementInfo {
 106   /// The parsed operands from the last parsed statement.
 107   SmallVector<std::unique_ptr<MCParsedAsmOperand>, 8> ParsedOperands;
 108
 109   /// The opcode from the last parsed instruction.
 110   unsigned Opcode = ~0U;
 111
 112   /// Was there an error parsing the inline assembly?
 113   bool ParseError = false;
 114
 115   SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr;
 116
 117   ParseStatementInfo() = delete;
 118   ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
 119     : AsmRewrites(rewrites) {}
 120 };
 121
 122 /// The concrete assembly parser instance.
 123 class AsmParser : public MCAsmParser {
 124 private:
 125   AsmLexer Lexer;
 126   MCContext &Ctx;
 127   MCStreamer &Out;
 128   const MCAsmInfo &MAI;
 129   SourceMgr &SrcMgr;
 130   SourceMgr::DiagHandlerTy SavedDiagHandler;
 131   void *SavedDiagContext;
 132   std::unique_ptr<MCAsmParserExtension> PlatformParser;
 133
 134   /// This is the current buffer index we're lexing from as managed by the
 135   /// SourceMgr object.
 136   unsigned CurBuffer;
 137
 138   AsmCond TheCondState;
 139   std::vector<AsmCond> TheCondStack;
 140
 141   /// maps directive names to handler methods in parser
 142   /// extensions. Extensions register themselves in this map by calling
 143   /// addDirectiveHandler.
 144   StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
 145
 146   /// Stack of active macro instantiations.
 147   std::vector<MacroInstantiation*> ActiveMacros;
 148
 149   /// List of bodies of anonymous macros.
 150   std::deque<MCAsmMacro> MacroLikeBodies;
 151
 152   /// Boolean tracking whether macro substitution is enabled.
 153   unsigned MacrosEnabledFlag : 1;
 154
 155   /// Keeps track of how many .macro's have been instantiated.
 156   unsigned NumOfMacroInstantiations;
 157
 158   /// The values from the last parsed cpp hash file line comment if any.
 159   struct CppHashInfoTy {
 160     StringRef Filename;
 161     int64_t LineNumber;
 162     SMLoc Loc;
 163     unsigned Buf;
 164     CppHashInfoTy() : Filename(), LineNumber(0), Loc(), Buf(0) {}
 165   };
 166   CppHashInfoTy CppHashInfo;
 167
 168   /// The filename from the first cpp hash file line comment, if any.
 169   StringRef FirstCppHashFilename;
 170
 171   /// List of forward directional labels for diagnosis at the end.
 172   SmallVector<std::tuple<SMLoc, CppHashInfoTy, MCSymbol *>, 4> DirLabels;
 173
 174   /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
 175   unsigned AssemblerDialect = ~0U;
 176
 177   /// is Darwin compatibility enabled?
 178   bool IsDarwin = false;
 179
 180   /// Are we parsing ms-style inline assembly?
 181   bool ParsingInlineAsm = false;
 182
 183   /// Did we already inform the user about inconsistent MD5 usage?
 184   bool ReportedInconsistentMD5 = false;
 185
 186   // Is alt macro mode enabled.
 187   bool AltMacroMode = false;
 188
 189 public:
 190   AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
 191             const MCAsmInfo &MAI, unsigned CB);
 192   AsmParser(const AsmParser &) = delete;
 193   AsmParser &operator=(const AsmParser &) = delete;
 194   ~AsmParser() override;
 195
 196   bool Run(bool NoInitialTextSection, bool NoFinalize = false) override;
 197
 198   void addDirectiveHandler(StringRef Directive,
 199                            ExtensionDirectiveHandler Handler) override {
 200     ExtensionDirectiveMap[Directive] = Handler;
 201   }
 202
 203   void addAliasForDirective(StringRef Directive, StringRef Alias) override {
 204     DirectiveKindMap[Directive] = DirectiveKindMap[Alias];
 205   }
 206
 207   /// @name MCAsmParser Interface
 208   /// {
 209
 210   SourceMgr &getSourceManager() override { return SrcMgr; }
 211   MCAsmLexer &getLexer() override { return Lexer; }
 212   MCContext &getContext() override { return Ctx; }
 213   MCStreamer &getStreamer() override { return Out; }
 214
 215   CodeViewContext &getCVContext() { return Ctx.getCVContext(); }
 216
 217   unsigned getAssemblerDialect() override {
 218     if (AssemblerDialect == ~0U)
 219       return MAI.getAssemblerDialect();
 220     else
 221       return AssemblerDialect;
 222   }
 223   void setAssemblerDialect(unsigned i) override {
 224     AssemblerDialect = i;
 225   }
 226
 227   void Note(SMLoc L, const Twine &Msg, SMRange Range = None) override;
 228   bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) override;
 229   bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) override;
 230
 231   const AsmToken &Lex() override;
 232
 233   void setParsingInlineAsm(bool V) override {
 234     ParsingInlineAsm = V;
 235     // When parsing MS inline asm, we must lex 0b1101 and 0ABCH as binary and
 236     // hex integer literals.
 237     Lexer.setLexMasmIntegers(V);
 238   }
 239   bool isParsingInlineAsm() override { return ParsingInlineAsm; }
 240
 241   bool parseMSInlineAsm(void *AsmLoc, std::string &AsmString,
 242                         unsigned &NumOutputs, unsigned &NumInputs,
 243                         SmallVectorImpl<std::pair<void *,bool>> &OpDecls,
 244                         SmallVectorImpl<std::string> &Constraints,
 245                         SmallVectorImpl<std::string> &Clobbers,
 246                         const MCInstrInfo *MII, const MCInstPrinter *IP,
 247                         MCAsmParserSemaCallback &SI) override;
 248
 249   bool parseExpression(const MCExpr *&Res);
 250   bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
 251   bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) override;
 252   bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
 253   bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
 254                              SMLoc &EndLoc) override;
 255   bool parseAbsoluteExpression(int64_t &Res) override;
 256
 257   /// Parse a floating point expression using the float \p Semantics
 258   /// and set \p Res to the value.
 259   bool parseRealValue(const fltSemantics &Semantics, APInt &Res);
 260
 261   /// Parse an identifier or string (as a quoted identifier)
 262   /// and set \p Res to the identifier contents.
 263   bool parseIdentifier(StringRef &Res) override;
 264   void eatToEndOfStatement() override;
 265
 266   bool checkForValidSection() override;
 267
 268   /// }
 269
 270 private:
 271   bool parseStatement(ParseStatementInfo &Info,
 272                       MCAsmParserSemaCallback *SI);
 273   bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites);
 274   bool parseCppHashLineFilenameComment(SMLoc L);
 275
 276   void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body,
 277                         ArrayRef<MCAsmMacroParameter> Parameters);
 278   bool expandMacro(raw_svector_ostream &OS, StringRef Body,
 279                    ArrayRef<MCAsmMacroParameter> Parameters,
 280                    ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable,
 281                    SMLoc L);
 282
 283   /// Are macros enabled in the parser?
 284   bool areMacrosEnabled() {return MacrosEnabledFlag;}
 285
 286   /// Control a flag in the parser that enables or disables macros.
 287   void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;}
 288
 289   /// Are we inside a macro instantiation?
 290   bool isInsideMacroInstantiation() {return !ActiveMacros.empty();}
 291
 292   /// Handle entry to macro instantiation.
 293   ///
 294   /// \param M The macro.
 295   /// \param NameLoc Instantiation location.
 296   bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc);
 297
 298   /// Handle exit from macro instantiation.
 299   void handleMacroExit();
 300
 301   /// Extract AsmTokens for a macro argument.
 302   bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg);
 303
 304   /// Parse all macro arguments for a given macro.
 305   bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
 306
 307   void printMacroInstantiations();
 308   void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
 309                     SMRange Range = None) const {
 310     ArrayRef<SMRange> Ranges(Range);
 311     SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
 312   }
 313   static void DiagHandler(const SMDiagnostic &Diag, void *Context);
 314
 315   /// Should we emit DWARF describing this assembler source?  (Returns false if
 316   /// the source has .file directives, which means we don't want to generate
 317   /// info describing the assembler source itself.)
 318   bool enabledGenDwarfForAssembly();
 319
 320   /// Enter the specified file. This returns true on failure.
 321   bool enterIncludeFile(const std::string &Filename);
 322
 323   /// Process the specified file for the .incbin directive.
 324   /// This returns true on failure.
 325   bool processIncbinFile(const std::string &Filename, int64_t Skip = 0,
 326                          const MCExpr *Count = nullptr, SMLoc Loc = SMLoc());
 327
 328   /// Reset the current lexer position to that given by \p Loc. The
 329   /// current token is not set; clients should ensure Lex() is called
 330   /// subsequently.
 331   ///
 332   /// \param InBuffer If not 0, should be the known buffer id that contains the
 333   /// location.
 334   void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0);
 335
 336   /// Parse up to the end of statement and a return the contents from the
 337   /// current token until the end of the statement; the current token on exit
 338   /// will be either the EndOfStatement or EOF.
 339   StringRef parseStringToEndOfStatement() override;
 340
 341   /// Parse until the end of a statement or a comma is encountered,
 342   /// return the contents from the current token up to the end or comma.
 343   StringRef parseStringToComma();
 344
 345   bool parseAssignment(StringRef Name, bool allow_redef,
 346                        bool NoDeadStrip = false);
 347
 348   unsigned getBinOpPrecedence(AsmToken::TokenKind K,
 349                               MCBinaryExpr::Opcode &Kind);
 350
 351   bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
 352   bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
 353   bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc);
 354
 355   bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc);
 356
 357   bool parseCVFunctionId(int64_t &FunctionId, StringRef DirectiveName);
 358   bool parseCVFileId(int64_t &FileId, StringRef DirectiveName);
 359
 360   // Generic (target and platform independent) directive parsing.
 361   enum DirectiveKind {
 362     DK_NO_DIRECTIVE, // Placeholder
 363     DK_SET,
 364     DK_EQU,
 365     DK_EQUIV,
 366     DK_ASCII,
 367     DK_ASCIZ,
 368     DK_STRING,
 369     DK_BYTE,
 370     DK_SHORT,
 371     DK_RELOC,
 372     DK_VALUE,
 373     DK_2BYTE,
 374     DK_LONG,
 375     DK_INT,
 376     DK_4BYTE,
 377     DK_QUAD,
 378     DK_8BYTE,
 379     DK_OCTA,
 380     DK_DC,
 381     DK_DC_A,
 382     DK_DC_B,
 383     DK_DC_D,
 384     DK_DC_L,
 385     DK_DC_S,
 386     DK_DC_W,
 387     DK_DC_X,
 388     DK_DCB,
 389     DK_DCB_B,
 390     DK_DCB_D,
 391     DK_DCB_L,
 392     DK_DCB_S,
 393     DK_DCB_W,
 394     DK_DCB_X,
 395     DK_DS,
 396     DK_DS_B,
 397     DK_DS_D,
 398     DK_DS_L,
 399     DK_DS_P,
 400     DK_DS_S,
 401     DK_DS_W,
 402     DK_DS_X,
 403     DK_SINGLE,
 404     DK_FLOAT,
 405     DK_DOUBLE,
 406     DK_ALIGN,
 407     DK_ALIGN32,
 408     DK_BALIGN,
 409     DK_BALIGNW,
 410     DK_BALIGNL,
 411     DK_P2ALIGN,
 412     DK_P2ALIGNW,
 413     DK_P2ALIGNL,
 414     DK_ORG,
 415     DK_FILL,
 416     DK_ENDR,
 417     DK_BUNDLE_ALIGN_MODE,
 418     DK_BUNDLE_LOCK,
 419     DK_BUNDLE_UNLOCK,
 420     DK_ZERO,
 421     DK_EXTERN,
 422     DK_GLOBL,
 423     DK_GLOBAL,
 424     DK_LAZY_REFERENCE,
 425     DK_NO_DEAD_STRIP,
 426     DK_SYMBOL_RESOLVER,
 427     DK_PRIVATE_EXTERN,
 428     DK_REFERENCE,
 429     DK_WEAK_DEFINITION,
 430     DK_WEAK_REFERENCE,
 431     DK_WEAK_DEF_CAN_BE_HIDDEN,
 432     DK_COLD,
 433     DK_COMM,
 434     DK_COMMON,
 435     DK_LCOMM,
 436     DK_ABORT,
 437     DK_INCLUDE,
 438     DK_INCBIN,
 439     DK_CODE16,
 440     DK_CODE16GCC,
 441     DK_REPT,
 442     DK_IRP,
 443     DK_IRPC,
 444     DK_IF,
 445     DK_IFEQ,
 446     DK_IFGE,
 447     DK_IFGT,
 448     DK_IFLE,
 449     DK_IFLT,
 450     DK_IFNE,
 451     DK_IFB,
 452     DK_IFNB,
 453     DK_IFC,
 454     DK_IFEQS,
 455     DK_IFNC,
 456     DK_IFNES,
 457     DK_IFDEF,
 458     DK_IFNDEF,
 459     DK_IFNOTDEF,
 460     DK_ELSEIF,
 461     DK_ELSE,
 462     DK_ENDIF,
 463     DK_SPACE,
 464     DK_SKIP,
 465     DK_FILE,
 466     DK_LINE,
 467     DK_LOC,
 468     DK_STABS,
 469     DK_CV_FILE,
 470     DK_CV_FUNC_ID,
 471     DK_CV_INLINE_SITE_ID,
 472     DK_CV_LOC,
 473     DK_CV_LINETABLE,
 474     DK_CV_INLINE_LINETABLE,
 475     DK_CV_DEF_RANGE,
 476     DK_CV_STRINGTABLE,
 477     DK_CV_STRING,
 478     DK_CV_FILECHECKSUMS,
 479     DK_CV_FILECHECKSUM_OFFSET,
 480     DK_CV_FPO_DATA,
 481     DK_CFI_SECTIONS,
 482     DK_CFI_STARTPROC,
 483     DK_CFI_ENDPROC,
 484     DK_CFI_DEF_CFA,
 485     DK_CFI_DEF_CFA_OFFSET,
 486     DK_CFI_ADJUST_CFA_OFFSET,
 487     DK_CFI_DEF_CFA_REGISTER,
 488     DK_CFI_OFFSET,
 489     DK_CFI_REL_OFFSET,
 490     DK_CFI_PERSONALITY,
 491     DK_CFI_LSDA,
 492     DK_CFI_REMEMBER_STATE,
 493     DK_CFI_RESTORE_STATE,
 494     DK_CFI_SAME_VALUE,
 495     DK_CFI_RESTORE,
 496     DK_CFI_ESCAPE,
 497     DK_CFI_RETURN_COLUMN,
 498     DK_CFI_SIGNAL_FRAME,
 499     DK_CFI_UNDEFINED,
 500     DK_CFI_REGISTER,
 501     DK_CFI_WINDOW_SAVE,
 502     DK_CFI_B_KEY_FRAME,
 503     DK_MACROS_ON,
 504     DK_MACROS_OFF,
 505     DK_ALTMACRO,
 506     DK_NOALTMACRO,
 507     DK_MACRO,
 508     DK_EXITM,
 509     DK_ENDM,
 510     DK_ENDMACRO,
 511     DK_PURGEM,
 512     DK_SLEB128,
 513     DK_ULEB128,
 514     DK_ERR,
 515     DK_ERROR,
 516     DK_WARNING,
 517     DK_PRINT,
 518     DK_ADDRSIG,
 519     DK_ADDRSIG_SYM,
 520     DK_END
 521   };
 522
 523   /// Maps directive name --> DirectiveKind enum, for
 524   /// directives parsed by this class.
 525   StringMap<DirectiveKind> DirectiveKindMap;
 526
 527   // ".ascii", ".asciz", ".string"
 528   bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
 529   bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc"
 530   bool parseDirectiveValue(StringRef IDVal,
 531                            unsigned Size);       // ".byte", ".long", ...
 532   bool parseDirectiveOctaValue(StringRef IDVal); // ".octa", ...
 533   bool parseDirectiveRealValue(StringRef IDVal,
 534                                const fltSemantics &); // ".single", ...
 535   bool parseDirectiveFill(); // ".fill"
 536   bool parseDirectiveZero(); // ".zero"
 537   // ".set", ".equ", ".equiv"
 538   bool parseDirectiveSet(StringRef IDVal, bool allow_redef);
 539   bool parseDirectiveOrg(); // ".org"
 540   // ".align{,32}", ".p2align{,w,l}"
 541   bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize);
 542
 543   // ".file", ".line", ".loc", ".stabs"
 544   bool parseDirectiveFile(SMLoc DirectiveLoc);
 545   bool parseDirectiveLine();
 546   bool parseDirectiveLoc();
 547   bool parseDirectiveStabs();
 548
 549   // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable",
 550   // ".cv_inline_linetable", ".cv_def_range", ".cv_string"
 551   bool parseDirectiveCVFile();
 552   bool parseDirectiveCVFuncId();
 553   bool parseDirectiveCVInlineSiteId();
 554   bool parseDirectiveCVLoc();
 555   bool parseDirectiveCVLinetable();
 556   bool parseDirectiveCVInlineLinetable();
 557   bool parseDirectiveCVDefRange();
 558   bool parseDirectiveCVString();
 559   bool parseDirectiveCVStringTable();
 560   bool parseDirectiveCVFileChecksums();
 561   bool parseDirectiveCVFileChecksumOffset();
 562   bool parseDirectiveCVFPOData();
 563
 564   // .cfi directives
 565   bool parseDirectiveCFIRegister(SMLoc DirectiveLoc);
 566   bool parseDirectiveCFIWindowSave();
 567   bool parseDirectiveCFISections();
 568   bool parseDirectiveCFIStartProc();
 569   bool parseDirectiveCFIEndProc();
 570   bool parseDirectiveCFIDefCfaOffset();
 571   bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
 572   bool parseDirectiveCFIAdjustCfaOffset();
 573   bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
 574   bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
 575   bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
 576   bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
 577   bool parseDirectiveCFIRememberState();
 578   bool parseDirectiveCFIRestoreState();
 579   bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
 580   bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
 581   bool parseDirectiveCFIEscape();
 582   bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc);
 583   bool parseDirectiveCFISignalFrame();
 584   bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);
 585
 586   // macro directives
 587   bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
 588   bool parseDirectiveExitMacro(StringRef Directive);
 589   bool parseDirectiveEndMacro(StringRef Directive);
 590   bool parseDirectiveMacro(SMLoc DirectiveLoc);
 591   bool parseDirectiveMacrosOnOff(StringRef Directive);
 592   // alternate macro mode directives
 593   bool parseDirectiveAltmacro(StringRef Directive);
 594   // ".bundle_align_mode"
 595   bool parseDirectiveBundleAlignMode();
 596   // ".bundle_lock"
 597   bool parseDirectiveBundleLock();
 598   // ".bundle_unlock"
 599   bool parseDirectiveBundleUnlock();
 600
 601   // ".space", ".skip"
 602   bool parseDirectiveSpace(StringRef IDVal);
 603
 604   // ".dcb"
 605   bool parseDirectiveDCB(StringRef IDVal, unsigned Size);
 606   bool parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &);
 607   // ".ds"
 608   bool parseDirectiveDS(StringRef IDVal, unsigned Size);
 609
 610   // .sleb128 (Signed=true) and .uleb128 (Signed=false)
 611   bool parseDirectiveLEB128(bool Signed);
 612
 613   /// Parse a directive like ".globl" which
 614   /// accepts a single symbol (which should be a label or an external).
 615   bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr);
 616
 617   bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
 618
 619   bool parseDirectiveAbort(); // ".abort"
 620   bool parseDirectiveInclude(); // ".include"
 621   bool parseDirectiveIncbin(); // ".incbin"
 622
 623   // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne"
 624   bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
 625   // ".ifb" or ".ifnb", depending on ExpectBlank.
 626   bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
 627   // ".ifc" or ".ifnc", depending on ExpectEqual.
 628   bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
 629   // ".ifeqs" or ".ifnes", depending on ExpectEqual.
 630   bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual);
 631   // ".ifdef" or ".ifndef", depending on expect_defined
 632   bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
 633   bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
 634   bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else"
 635   bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
 636   bool parseEscapedString(std::string &Data) override;
 637
 638   const MCExpr *applyModifierToExpr(const MCExpr *E,
 639                                     MCSymbolRefExpr::VariantKind Variant);
 640
 641   // Macro-like directives
 642   MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
 643   void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
 644                                 raw_svector_ostream &OS);
 645   bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive);
 646   bool parseDirectiveIrp(SMLoc DirectiveLoc);  // ".irp"
 647   bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
 648   bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
 649
 650   // "_emit" or "__emit"
 651   bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
 652                             size_t Len);
 653
 654   // "align"
 655   bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);
 656
 657   // "end"
 658   bool parseDirectiveEnd(SMLoc DirectiveLoc);
 659
 660   // ".err" or ".error"
 661   bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage);
 662
 663   // ".warning"
 664   bool parseDirectiveWarning(SMLoc DirectiveLoc);
 665
 666   // .print <double-quotes-string>
 667   bool parseDirectivePrint(SMLoc DirectiveLoc);
 668
 669   // Directives to support address-significance tables.
 670   bool parseDirectiveAddrsig();
 671   bool parseDirectiveAddrsigSym();
 672
 673   void initializeDirectiveKindMap();
 674 };
 675
 676 } // end anonymous namespace
 677
 678 namespace llvm {
 679
 680 extern MCAsmParserExtension *createDarwinAsmParser();
 681 extern MCAsmParserExtension *createELFAsmParser();
 682 extern MCAsmParserExtension *createCOFFAsmParser();
 683 extern MCAsmParserExtension *createWasmAsmParser();
 684
 685 } // end namespace llvm
 686
 687 enum { DEFAULT_ADDRSPACE = 0 };
 688
 689 AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
 690                      const MCAsmInfo &MAI, unsigned CB = 0)
 691     : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM),
 692       CurBuffer(CB ? CB : SM.getMainFileID()), MacrosEnabledFlag(true) {
 693   HadError = false;
 694   // Save the old handler.
 695   SavedDiagHandler = SrcMgr.getDiagHandler();
 696   SavedDiagContext = SrcMgr.getDiagContext();
 697   // Set our own handler which calls the saved handler.
 698   SrcMgr.setDiagHandler(DiagHandler, this);
 699   Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
 700
 701   // Initialize the platform / file format parser.
 702   switch (Ctx.getObjectFileInfo()->getObjectFileType()) {
 703   case MCObjectFileInfo::IsCOFF:
 704     PlatformParser.reset(createCOFFAsmParser());
 705     break;
 706   case MCObjectFileInfo::IsMachO:
 707     PlatformParser.reset(createDarwinAsmParser());
 708     IsDarwin = true;
 709     break;
 710   case MCObjectFileInfo::IsELF:
 711     PlatformParser.reset(createELFAsmParser());
 712     break;
 713   case MCObjectFileInfo::IsWasm:
 714     PlatformParser.reset(createWasmAsmParser());
 715     break;
 716   case MCObjectFileInfo::IsXCOFF:
 717     // TODO: Need to implement createXCOFFAsmParser for XCOFF format.
 718     break;
 719   }
 720
 721   PlatformParser->Initialize(*this);
 722   initializeDirectiveKindMap();
 723
 724   NumOfMacroInstantiations = 0;
 725 }
 726
 727 AsmParser::~AsmParser() {
 728   assert((HadError || ActiveMacros.empty()) &&
 729          "Unexpected active macro instantiation!");
 730
 731   // Restore the saved diagnostics handler and context for use during
 732   // finalization.
 733   SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext);
 734 }
 735
 736 void AsmParser::printMacroInstantiations() {
 737   // Print the active macro instantiation stack.
 738   for (std::vector<MacroInstantiation *>::const_reverse_iterator
 739            it = ActiveMacros.rbegin(),
 740            ie = ActiveMacros.rend();
 741        it != ie; ++it)
 742     printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
 743                  "while in macro instantiation");
 744 }
 745
 746 void AsmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) {
 747   printPendingErrors();
 748   printMessage(L, SourceMgr::DK_Note, Msg, Range);
 749   printMacroInstantiations();
 750 }
 751
 752 bool AsmParser::Warning(SMLoc L, const Twine &Msg, SMRange Range) {
 753   if(getTargetParser().getTargetOptions().MCNoWarn)
 754     return false;
 755   if (getTargetParser().getTargetOptions().MCFatalWarnings)
 756     return Error(L, Msg, Range);
 757   printMessage(L, SourceMgr::DK_Warning, Msg, Range);
 758   printMacroInstantiations();
 759   return false;
 760 }
 761
 762 bool AsmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) {
 763   HadError = true;
 764   printMessage(L, SourceMgr::DK_Error, Msg, Range);
 765   printMacroInstantiations();
 766   return true;
 767 }
 768
 769 bool AsmParser::enterIncludeFile(const std::string &Filename) {
 770   std::string IncludedFile;
 771   unsigned NewBuf =
 772       SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
 773   if (!NewBuf)
 774     return true;
 775
 776   CurBuffer = NewBuf;
 777   Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
 778   return false;
 779 }
 780
 781 /// Process the specified .incbin file by searching for it in the include paths
 782 /// then just emitting the byte contents of the file to the streamer. This
 783 /// returns true on failure.
 784 bool AsmParser::processIncbinFile(const std::string &Filename, int64_t Skip,
 785                                   const MCExpr *Count, SMLoc Loc) {
 786   std::string IncludedFile;
 787   unsigned NewBuf =
 788       SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
 789   if (!NewBuf)
 790     return true;
 791
 792   // Pick up the bytes from the file and emit them.
 793   StringRef Bytes = SrcMgr.getMemoryBuffer(NewBuf)->getBuffer();
 794   Bytes = Bytes.drop_front(Skip);
 795   if (Count) {
 796     int64_t Res;
 797     if (!Count->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
 798       return Error(Loc, "expected absolute expression");
 799     if (Res < 0)
 800       return Warning(Loc, "negative count has no effect");
 801     Bytes = Bytes.take_front(Res);
 802   }
 803   getStreamer().EmitBytes(Bytes);
 804   return false;
 805 }
 806
 807 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) {
 808   CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc);
 809   Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(),
 810                   Loc.getPointer());
 811 }
 812
 813 const AsmToken &AsmParser::Lex() {
 814   if (Lexer.getTok().is(AsmToken::Error))
 815     Error(Lexer.getErrLoc(), Lexer.getErr());
 816
 817   // if it's a end of statement with a comment in it
 818   if (getTok().is(AsmToken::EndOfStatement)) {
 819     // if this is a line comment output it.
 820     if (!getTok().getString().empty() && getTok().getString().front() != '\n' &&
 821         getTok().getString().front() != '\r' && MAI.preserveAsmComments())
 822       Out.addExplicitComment(Twine(getTok().getString()));
 823   }
 824
 825   const AsmToken *tok = &Lexer.Lex();
 826
 827   // Parse comments here to be deferred until end of next statement.
 828   while (tok->is(AsmToken::Comment)) {
 829     if (MAI.preserveAsmComments())
 830       Out.addExplicitComment(Twine(tok->getString()));
 831     tok = &Lexer.Lex();
 832   }
 833
 834   if (tok->is(AsmToken::Eof)) {
 835     // If this is the end of an included file, pop the parent file off the
 836     // include stack.
 837     SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
 838     if (ParentIncludeLoc != SMLoc()) {
 839       jumpToLoc(ParentIncludeLoc);
 840       return Lex();
 841     }
 842   }
 843
 844   return *tok;
 845 }
 846
 847 bool AsmParser::enabledGenDwarfForAssembly() {
 848   // Check whether the user specified -g.
 849   if (!getContext().getGenDwarfForAssembly())
 850     return false;
 851   // If we haven't encountered any .file directives (which would imply that
 852   // the assembler source was produced with debug info already) then emit one
 853   // describing the assembler source file itself.
 854   if (getContext().getGenDwarfFileNumber() == 0) {
 855     // Use the first #line directive for this, if any. It's preprocessed, so
 856     // there is no checksum, and of course no source directive.
 857     if (!FirstCppHashFilename.empty())
 858       getContext().setMCLineTableRootFile(/*CUID=*/0,
 859                                           getContext().getCompilationDir(),
 860                                           FirstCppHashFilename,
 861                                           /*Cksum=*/None, /*Source=*/None);
 862     const MCDwarfFile &RootFile =
 863         getContext().getMCDwarfLineTable(/*CUID=*/0).getRootFile();
 864     getContext().setGenDwarfFileNumber(getStreamer().EmitDwarfFileDirective(
 865         /*CUID=*/0, getContext().getCompilationDir(), RootFile.Name,
 866         RootFile.Checksum, RootFile.Source));
 867   }
 868   return true;
 869 }
 870
 871 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
 872   // Create the initial section, if requested.
 873   if (!NoInitialTextSection)
 874     Out.InitSections(false);
 875
 876   // Prime the lexer.
 877   Lex();
 878
 879   HadError = false;
 880   AsmCond StartingCondState = TheCondState;
 881   SmallVector<AsmRewrite, 4> AsmStrRewrites;
 882
 883   // If we are generating dwarf for assembly source files save the initial text
 884   // section.  (Don't use enabledGenDwarfForAssembly() here, as we aren't
 885   // emitting any actual debug info yet and haven't had a chance to parse any
 886   // embedded .file directives.)
 887   if (getContext().getGenDwarfForAssembly()) {
 888     MCSection *Sec = getStreamer().getCurrentSectionOnly();
 889     if (!Sec->getBeginSymbol()) {
 890       MCSymbol *SectionStartSym = getContext().createTempSymbol();
 891       getStreamer().EmitLabel(SectionStartSym);
 892       Sec->setBeginSymbol(SectionStartSym);
 893     }
 894     bool InsertResult = getContext().addGenDwarfSection(Sec);
 895     assert(InsertResult && ".text section should not have debug info yet");
 896     (void)InsertResult;
 897   }
 898
 899   // While we have input, parse each statement.
 900   while (Lexer.isNot(AsmToken::Eof)) {
 901     ParseStatementInfo Info(&AsmStrRewrites);
 902     if (!parseStatement(Info, nullptr))
 903       continue;
 904
 905     // If we have a Lexer Error we are on an Error Token. Load in Lexer Error
 906     // for printing ErrMsg via Lex() only if no (presumably better) parser error
 907     // exists.
 908     if (!hasPendingError() && Lexer.getTok().is(AsmToken::Error)) {
 909       Lex();
 910     }
 911
 912     // parseStatement returned true so may need to emit an error.
 913     printPendingErrors();
 914
 915     // Skipping to the next line if needed.
 916     if (!getLexer().isAtStartOfStatement())
 917       eatToEndOfStatement();
 918   }
 919
 920   getTargetParser().onEndOfFile();
 921   printPendingErrors();
 922
 923   // All errors should have been emitted.
 924   assert(!hasPendingError() && "unexpected error from parseStatement");
 925
 926   getTargetParser().flushPendingInstructions(getStreamer());
 927
 928   if (TheCondState.TheCond != StartingCondState.TheCond ||
 929       TheCondState.Ignore != StartingCondState.Ignore)
 930     printError(getTok().getLoc(), "unmatched .ifs or .elses");
 931   // Check to see there are no empty DwarfFile slots.
 932   const auto &LineTables = getContext().getMCDwarfLineTables();
 933   if (!LineTables.empty()) {
 934     unsigned Index = 0;
 935     for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) {
 936       if (File.Name.empty() && Index != 0)
 937         printError(getTok().getLoc(), "unassigned file number: " +
 938                                           Twine(Index) +
 939                                           " for .file directives");
 940       ++Index;
 941     }
 942   }
 943
 944   // Check to see that all assembler local symbols were actually defined.
 945   // Targets that don't do subsections via symbols may not want this, though,
 946   // so conservatively exclude them. Only do this if we're finalizing, though,
 947   // as otherwise we won't necessarilly have seen everything yet.
 948   if (!NoFinalize) {
 949     if (MAI.hasSubsectionsViaSymbols()) {
 950       for (const auto &TableEntry : getContext().getSymbols()) {
 951         MCSymbol *Sym = TableEntry.getValue();
 952         // Variable symbols may not be marked as defined, so check those
 953         // explicitly. If we know it's a variable, we have a definition for
 954         // the purposes of this check.
 955         if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
 956           // FIXME: We would really like to refer back to where the symbol was
 957           // first referenced for a source location. We need to add something
 958           // to track that. Currently, we just point to the end of the file.
 959           printError(getTok().getLoc(), "assembler local symbol '" +
 960                                             Sym->getName() + "' not defined");
 961       }
 962     }
 963
 964     // Temporary symbols like the ones for directional jumps don't go in the
 965     // symbol table. They also need to be diagnosed in all (final) cases.
 966     for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) {
 967       if (std::get<2>(LocSym)->isUndefined()) {
 968         // Reset the state of any "# line file" directives we've seen to the
 969         // context as it was at the diagnostic site.
 970         CppHashInfo = std::get<1>(LocSym);
 971         printError(std::get<0>(LocSym), "directional label undefined");
 972       }
 973     }
 974   }
 975
 976   // Finalize the output stream if there are no errors and if the client wants
 977   // us to.
 978   if (!HadError && !NoFinalize)
 979     Out.Finish();
 980
 981   return HadError || getContext().hadError();
 982 }
 983
 984 bool AsmParser::checkForValidSection() {
 985   if (!ParsingInlineAsm && !getStreamer().getCurrentSectionOnly()) {
 986     Out.InitSections(false);
 987     return Error(getTok().getLoc(),
 988                  "expected section directive before assembly directive");
 989   }
 990   return false;
 991 }
 992
 993 /// Throw away the rest of the line for testing purposes.
 994 void AsmParser::eatToEndOfStatement() {
 995   while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
 996     Lexer.Lex();
 997
 998   // Eat EOL.
 999   if (Lexer.is(AsmToken::EndOfStatement))
1000     Lexer.Lex();
1001 }
1002
1003 StringRef AsmParser::parseStringToEndOfStatement() {
1004   const char *Start = getTok().getLoc().getPointer();
1005
1006   while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
1007     Lexer.Lex();
1008
1009   const char *End = getTok().getLoc().getPointer();
1010   return StringRef(Start, End - Start);
1011 }
1012
1013 StringRef AsmParser::parseStringToComma() {
1014   const char *Start = getTok().getLoc().getPointer();
1015
1016   while (Lexer.isNot(AsmToken::EndOfStatement) &&
1017          Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof))
1018     Lexer.Lex();
1019
1020   const char *End = getTok().getLoc().getPointer();
1021   return StringRef(Start, End - Start);
1022 }
1023
1024 /// Parse a paren expression and return it.
1025 /// NOTE: This assumes the leading '(' has already been consumed.
1026 ///
1027 /// parenexpr ::= expr)
1028 ///
1029 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1030   if (parseExpression(Res))
1031     return true;
1032   if (Lexer.isNot(AsmToken::RParen))
1033     return TokError("expected ')' in parentheses expression");
1034   EndLoc = Lexer.getTok().getEndLoc();
1035   Lex();
1036   return false;
1037 }
1038
1039 /// Parse a bracket expression and return it.
1040 /// NOTE: This assumes the leading '[' has already been consumed.
1041 ///
1042 /// bracketexpr ::= expr]
1043 ///
1044 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1045   if (parseExpression(Res))
1046     return true;
1047   EndLoc = getTok().getEndLoc();
1048   if (parseToken(AsmToken::RBrac, "expected ']' in brackets expression"))
1049     return true;
1050   return false;
1051 }
1052
1053 /// Parse a primary expression and return it.
1054 ///  primaryexpr ::= (parenexpr
1055 ///  primaryexpr ::= symbol
1056 ///  primaryexpr ::= number
1057 ///  primaryexpr ::= '.'
1058 ///  primaryexpr ::= ~,+,- primaryexpr
1059 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1060   SMLoc FirstTokenLoc = getLexer().getLoc();
1061   AsmToken::TokenKind FirstTokenKind = Lexer.getKind();
1062   switch (FirstTokenKind) {
1063   default:
1064     return TokError("unknown token in expression");
1065   // If we have an error assume that we've already handled it.
1066   case AsmToken::Error:
1067     return true;
1068   case AsmToken::Exclaim:
1069     Lex(); // Eat the operator.
1070     if (parsePrimaryExpr(Res, EndLoc))
1071       return true;
1072     Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc);
1073     return false;
1074   case AsmToken::Dollar:
1075   case AsmToken::At:
1076   case AsmToken::String:
1077   case AsmToken::Identifier: {
1078     StringRef Identifier;
1079     if (parseIdentifier(Identifier)) {
1080       // We may have failed but $ may be a valid token.
1081       if (getTok().is(AsmToken::Dollar)) {
1082         if (Lexer.getMAI().getDollarIsPC()) {
1083           Lex();
1084           // This is a '$' reference, which references the current PC.  Emit a
1085           // temporary label to the streamer and refer to it.
1086           MCSymbol *Sym = Ctx.createTempSymbol();
1087           Out.EmitLabel(Sym);
1088           Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None,
1089                                         getContext());
1090           EndLoc = FirstTokenLoc;
1091           return false;
1092         }
1093         return Error(FirstTokenLoc, "invalid token in expression");
1094       }
1095     }
1096     // Parse symbol variant
1097     std::pair<StringRef, StringRef> Split;
1098     if (!MAI.useParensForSymbolVariant()) {
1099       if (FirstTokenKind == AsmToken::String) {
1100         if (Lexer.is(AsmToken::At)) {
1101           Lex(); // eat @
1102           SMLoc AtLoc = getLexer().getLoc();
1103           StringRef VName;
1104           if (parseIdentifier(VName))
1105             return Error(AtLoc, "expected symbol variant after '@'");
1106
1107           Split = std::make_pair(Identifier, VName);
1108         }
1109       } else {
1110         Split = Identifier.split('@');
1111       }
1112     } else if (Lexer.is(AsmToken::LParen)) {
1113       Lex(); // eat '('.
1114       StringRef VName;
1115       parseIdentifier(VName);
1116       // eat ')'.
1117       if (parseToken(AsmToken::RParen,
1118                      "unexpected token in variant, expected ')'"))
1119         return true;
1120       Split = std::make_pair(Identifier, VName);
1121     }
1122
1123     EndLoc = SMLoc::getFromPointer(Identifier.end());
1124
1125     // This is a symbol reference.
1126     StringRef SymbolName = Identifier;
1127     if (SymbolName.empty())
1128       return Error(getLexer().getLoc(), "expected a symbol reference");
1129
1130     MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
1131
1132     // Lookup the symbol variant if used.
1133     if (!Split.second.empty()) {
1134       Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
1135       if (Variant != MCSymbolRefExpr::VK_Invalid) {
1136         SymbolName = Split.first;
1137       } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) {
1138         Variant = MCSymbolRefExpr::VK_None;
1139       } else {
1140         return Error(SMLoc::getFromPointer(Split.second.begin()),
1141                      "invalid variant '" + Split.second + "'");
1142       }
1143     }
1144
1145     MCSymbol *Sym = getContext().getOrCreateSymbol(SymbolName);
1146
1147     // If this is an absolute variable reference, substitute it now to preserve
1148     // semantics in the face of reassignment.
1149     if (Sym->isVariable()) {
1150       auto V = Sym->getVariableValue(/*SetUsed*/ false);
1151       bool DoInline = isa<MCConstantExpr>(V) && !Variant;
1152       if (auto TV = dyn_cast<MCTargetExpr>(V))
1153         DoInline = TV->inlineAssignedExpr();
1154       if (DoInline) {
1155         if (Variant)
1156           return Error(EndLoc, "unexpected modifier on variable reference");
1157         Res = Sym->getVariableValue(/*SetUsed*/ false);
1158         return false;
1159       }
1160     }
1161
1162     // Otherwise create a symbol ref.
1163     Res = MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc);
1164     return false;
1165   }
1166   case AsmToken::BigNum:
1167     return TokError("literal value out of range for directive");
1168   case AsmToken::Integer: {
1169     SMLoc Loc = getTok().getLoc();
1170     int64_t IntVal = getTok().getIntVal();
1171     Res = MCConstantExpr::create(IntVal, getContext());
1172     EndLoc = Lexer.getTok().getEndLoc();
1173     Lex(); // Eat token.
1174     // Look for 'b' or 'f' following an Integer as a directional label
1175     if (Lexer.getKind() == AsmToken::Identifier) {
1176       StringRef IDVal = getTok().getString();
1177       // Lookup the symbol variant if used.
1178       std::pair<StringRef, StringRef> Split = IDVal.split('@');
1179       MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
1180       if (Split.first.size() != IDVal.size()) {
1181         Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
1182         if (Variant == MCSymbolRefExpr::VK_Invalid)
1183           return TokError("invalid variant '" + Split.second + "'");
1184         IDVal = Split.first;
1185       }
1186       if (IDVal == "f" || IDVal == "b") {
1187         MCSymbol *Sym =
1188             Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b");
1189         Res = MCSymbolRefExpr::create(Sym, Variant, getContext());
1190         if (IDVal == "b" && Sym->isUndefined())
1191           return Error(Loc, "directional label undefined");
1192         DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym));
1193         EndLoc = Lexer.getTok().getEndLoc();
1194         Lex(); // Eat identifier.
1195       }
1196     }
1197     return false;
1198   }
1199   case AsmToken::Real: {
1200     APFloat RealVal(APFloat::IEEEdouble(), getTok().getString());
1201     uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
1202     Res = MCConstantExpr::create(IntVal, getContext());
1203     EndLoc = Lexer.getTok().getEndLoc();
1204     Lex(); // Eat token.
1205     return false;
1206   }
1207   case AsmToken::Dot: {
1208     // This is a '.' reference, which references the current PC.  Emit a
1209     // temporary label to the streamer and refer to it.
1210     MCSymbol *Sym = Ctx.createTempSymbol();
1211     Out.EmitLabel(Sym);
1212     Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
1213     EndLoc = Lexer.getTok().getEndLoc();
1214     Lex(); // Eat identifier.
1215     return false;
1216   }
1217   case AsmToken::LParen:
1218     Lex(); // Eat the '('.
1219     return parseParenExpr(Res, EndLoc);
1220   case AsmToken::LBrac:
1221     if (!PlatformParser->HasBracketExpressions())
1222       return TokError("brackets expression not supported on this target");
1223     Lex(); // Eat the '['.
1224     return parseBracketExpr(Res, EndLoc);
1225   case AsmToken::Minus:
1226     Lex(); // Eat the operator.
1227     if (parsePrimaryExpr(Res, EndLoc))
1228       return true;
1229     Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc);
1230     return false;
1231   case AsmToken::Plus:
1232     Lex(); // Eat the operator.
1233     if (parsePrimaryExpr(Res, EndLoc))
1234       return true;
1235     Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc);
1236     return false;
1237   case AsmToken::Tilde:
1238     Lex(); // Eat the operator.
1239     if (parsePrimaryExpr(Res, EndLoc))
1240       return true;
1241     Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc);
1242     return false;
1243   // MIPS unary expression operators. The lexer won't generate these tokens if
1244   // MCAsmInfo::HasMipsExpressions is false for the target.
1245   case AsmToken::PercentCall16:
1246   case AsmToken::PercentCall_Hi:
1247   case AsmToken::PercentCall_Lo:
1248   case AsmToken::PercentDtprel_Hi:
1249   case AsmToken::PercentDtprel_Lo:
1250   case AsmToken::PercentGot:
1251   case AsmToken::PercentGot_Disp:
1252   case AsmToken::PercentGot_Hi:
1253   case AsmToken::PercentGot_Lo:
1254   case AsmToken::PercentGot_Ofst:
1255   case AsmToken::PercentGot_Page:
1256   case AsmToken::PercentGottprel:
1257   case AsmToken::PercentGp_Rel:
1258   case AsmToken::PercentHi:
1259   case AsmToken::PercentHigher:
1260   case AsmToken::PercentHighest:
1261   case AsmToken::PercentLo:
1262   case AsmToken::PercentNeg:
1263   case AsmToken::PercentPcrel_Hi:
1264   case AsmToken::PercentPcrel_Lo:
1265   case AsmToken::PercentTlsgd:
1266   case AsmToken::PercentTlsldm:
1267   case AsmToken::PercentTprel_Hi:
1268   case AsmToken::PercentTprel_Lo:
1269     Lex(); // Eat the operator.
1270     if (Lexer.isNot(AsmToken::LParen))
1271       return TokError("expected '(' after operator");
1272     Lex(); // Eat the operator.
1273     if (parseExpression(Res, EndLoc))
1274       return true;
1275     if (Lexer.isNot(AsmToken::RParen))
1276       return TokError("expected ')'");
1277     Lex(); // Eat the operator.
1278     Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx);
1279     return !Res;
1280   }
1281 }
1282
1283 bool AsmParser::parseExpression(const MCExpr *&Res) {
1284   SMLoc EndLoc;
1285   return parseExpression(Res, EndLoc);
1286 }
1287
1288 const MCExpr *
1289 AsmParser::applyModifierToExpr(const MCExpr *E,
1290                                MCSymbolRefExpr::VariantKind Variant) {
1291   // Ask the target implementation about this expression first.
1292   const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
1293   if (NewE)
1294     return NewE;
1295   // Recurse over the given expression, rebuilding it to apply the given variant
1296   // if there is exactly one symbol.
1297   switch (E->getKind()) {
1298   case MCExpr::Target:
1299   case MCExpr::Constant:
1300     return nullptr;
1301
1302   case MCExpr::SymbolRef: {
1303     const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
1304
1305     if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
1306       TokError("invalid variant on expression '" + getTok().getIdentifier() +
1307                "' (already modified)");
1308       return E;
1309     }
1310
1311     return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext());
1312   }
1313
1314   case MCExpr::Unary: {
1315     const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
1316     const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
1317     if (!Sub)
1318       return nullptr;
1319     return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext());
1320   }
1321
1322   case MCExpr::Binary: {
1323     const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
1324     const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
1325     const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);
1326
1327     if (!LHS && !RHS)
1328       return nullptr;
1329
1330     if (!LHS)
1331       LHS = BE->getLHS();
1332     if (!RHS)
1333       RHS = BE->getRHS();
1334
1335     return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext());
1336   }
1337   }
1338
1339   llvm_unreachable("Invalid expression kind!");
1340 }
1341
1342 /// This function checks if the next token is <string> type or arithmetic.
1343 /// string that begin with character '<' must end with character '>'.
1344 /// otherwise it is arithmetics.
1345 /// If the function returns a 'true' value,
1346 /// the End argument will be filled with the last location pointed to the '>'
1347 /// character.
1348
1349 /// There is a gap between the AltMacro's documentation and the single quote
1350 /// implementation. GCC does not fully support this feature and so we will not
1351 /// support it.
1352 /// TODO: Adding single quote as a string.
1353 static bool isAltmacroString(SMLoc &StrLoc, SMLoc &EndLoc) {
1354   assert((StrLoc.getPointer() != nullptr) &&
1355          "Argument to the function cannot be a NULL value");
1356   const char *CharPtr = StrLoc.getPointer();
1357   while ((*CharPtr != '>') && (*CharPtr != '\n') && (*CharPtr != '\r') &&
1358          (*CharPtr != '\0')) {
1359     if (*CharPtr == '!')
1360       CharPtr++;
1361     CharPtr++;
1362   }
1363   if (*CharPtr == '>') {
1364     EndLoc = StrLoc.getFromPointer(CharPtr + 1);
1365     return true;
1366   }
1367   return false;
1368 }
1369
1370 /// creating a string without the escape characters '!'.
1371 static std::string altMacroString(StringRef AltMacroStr) {
1372   std::string Res;
1373   for (size_t Pos = 0; Pos < AltMacroStr.size(); Pos++) {
1374     if (AltMacroStr[Pos] == '!')
1375       Pos++;
1376     Res += AltMacroStr[Pos];
1377   }
1378   return Res;
1379 }
1380
1381 /// Parse an expression and return it.
1382 ///
1383 ///  expr ::= expr &&,|| expr               -> lowest.
1384 ///  expr ::= expr |,^,&,! expr
1385 ///  expr ::= expr ==,!=,<>,<,<=,>,>= expr
1386 ///  expr ::= expr <<,>> expr
1387 ///  expr ::= expr +,- expr
1388 ///  expr ::= expr *,/,% expr               -> highest.
1389 ///  expr ::= primaryexpr
1390 ///
1391 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1392   // Parse the expression.
1393   Res = nullptr;
1394   if (getTargetParser().parsePrimaryExpr(Res, EndLoc) ||
1395       parseBinOpRHS(1, Res, EndLoc))
1396     return true;
1397
1398   // As a special case, we support 'a op b @ modifier' by rewriting the
1399   // expression to include the modifier. This is inefficient, but in general we
1400   // expect users to use 'a@modifier op b'.
1401   if (Lexer.getKind() == AsmToken::At) {
1402     Lex();
1403
1404     if (Lexer.isNot(AsmToken::Identifier))
1405       return TokError("unexpected symbol modifier following '@'");
1406
1407     MCSymbolRefExpr::VariantKind Variant =
1408         MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
1409     if (Variant == MCSymbolRefExpr::VK_Invalid)
1410       return TokError("invalid variant '" + getTok().getIdentifier() + "'");
1411
1412     const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
1413     if (!ModifiedRes) {
1414       return TokError("invalid modifier '" + getTok().getIdentifier() +
1415                       "' (no symbols present)");
1416     }
1417
1418     Res = ModifiedRes;
1419     Lex();
1420   }
1421
1422   // Try to constant fold it up front, if possible. Do not exploit
1423   // assembler here.
1424   int64_t Value;
1425   if (Res->evaluateAsAbsolute(Value))
1426     Res = MCConstantExpr::create(Value, getContext());
1427
1428   return false;
1429 }
1430
1431 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1432   Res = nullptr;
1433   return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1434 }
1435
1436 bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
1437                                       SMLoc &EndLoc) {
1438   if (parseParenExpr(Res, EndLoc))
1439     return true;
1440
1441   for (; ParenDepth > 0; --ParenDepth) {
1442     if (parseBinOpRHS(1, Res, EndLoc))
1443       return true;
1444
1445     // We don't Lex() the last RParen.
1446     // This is the same behavior as parseParenExpression().
1447     if (ParenDepth - 1 > 0) {
1448       EndLoc = getTok().getEndLoc();
1449       if (parseToken(AsmToken::RParen,
1450                      "expected ')' in parentheses expression"))
1451         return true;
1452     }
1453   }
1454   return false;
1455 }
1456
1457 bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1458   const MCExpr *Expr;
1459
1460   SMLoc StartLoc = Lexer.getLoc();
1461   if (parseExpression(Expr))
1462     return true;
1463
1464   if (!Expr->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
1465     return Error(StartLoc, "expected absolute expression");
1466
1467   return false;
1468 }
1469
1470 static unsigned getDarwinBinOpPrecedence(AsmToken::TokenKind K,
1471                                          MCBinaryExpr::Opcode &Kind,
1472                                          bool ShouldUseLogicalShr) {
1473   switch (K) {
1474   default:
1475     return 0; // not a binop.
1476
1477   // Lowest Precedence: &&, ||
1478   case AsmToken::AmpAmp:
1479     Kind = MCBinaryExpr::LAnd;
1480     return 1;
1481   case AsmToken::PipePipe:
1482     Kind = MCBinaryExpr::LOr;
1483     return 1;
1484
1485   // Low Precedence: |, &, ^
1486   //
1487   // FIXME: gas seems to support '!' as an infix operator?
1488   case AsmToken::Pipe:
1489     Kind = MCBinaryExpr::Or;
1490     return 2;
1491   case AsmToken::Caret:
1492     Kind = MCBinaryExpr::Xor;
1493     return 2;
1494   case AsmToken::Amp:
1495     Kind = MCBinaryExpr::And;
1496     return 2;
1497
1498   // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1499   case AsmToken::EqualEqual:
1500     Kind = MCBinaryExpr::EQ;
1501     return 3;
1502   case AsmToken::ExclaimEqual:
1503   case AsmToken::LessGreater:
1504     Kind = MCBinaryExpr::NE;
1505     return 3;
1506   case AsmToken::Less:
1507     Kind = MCBinaryExpr::LT;
1508     return 3;
1509   case AsmToken::LessEqual:
1510     Kind = MCBinaryExpr::LTE;
1511     return 3;
1512   case AsmToken::Greater:
1513     Kind = MCBinaryExpr::GT;
1514     return 3;
1515   case AsmToken::GreaterEqual:
1516     Kind = MCBinaryExpr::GTE;
1517     return 3;
1518
1519   // Intermediate Precedence: <<, >>
1520   case AsmToken::LessLess:
1521     Kind = MCBinaryExpr::Shl;
1522     return 4;
1523   case AsmToken::GreaterGreater:
1524     Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
1525     return 4;
1526
1527   // High Intermediate Precedence: +, -
1528   case AsmToken::Plus:
1529     Kind = MCBinaryExpr::Add;
1530     return 5;
1531   case AsmToken::Minus:
1532     Kind = MCBinaryExpr::Sub;
1533     return 5;
1534
1535   // Highest Precedence: *, /, %
1536   case AsmToken::Star:
1537     Kind = MCBinaryExpr::Mul;
1538     return 6;
1539   case AsmToken::Slash:
1540     Kind = MCBinaryExpr::Div;
1541     return 6;
1542   case AsmToken::Percent:
1543     Kind = MCBinaryExpr::Mod;
1544     return 6;
1545   }
1546 }
1547
1548 static unsigned getGNUBinOpPrecedence(AsmToken::TokenKind K,
1549                                       MCBinaryExpr::Opcode &Kind,
1550                                       bool ShouldUseLogicalShr) {
1551   switch (K) {
1552   default:
1553     return 0; // not a binop.
1554
1555   // Lowest Precedence: &&, ||
1556   case AsmToken::AmpAmp:
1557     Kind = MCBinaryExpr::LAnd;
1558     return 2;
1559   case AsmToken::PipePipe:
1560     Kind = MCBinaryExpr::LOr;
1561     return 1;
1562
1563   // Low Precedence: ==, !=, <>, <, <=, >, >=
1564   case AsmToken::EqualEqual:
1565     Kind = MCBinaryExpr::EQ;
1566     return 3;
1567   case AsmToken::ExclaimEqual:
1568   case AsmToken::LessGreater:
1569     Kind = MCBinaryExpr::NE;
1570     return 3;
1571   case AsmToken::Less:
1572     Kind = MCBinaryExpr::LT;
1573     return 3;
1574   case AsmToken::LessEqual:
1575     Kind = MCBinaryExpr::LTE;
1576     return 3;
1577   case AsmToken::Greater:
1578     Kind = MCBinaryExpr::GT;
1579     return 3;
1580   case AsmToken::GreaterEqual:
1581     Kind = MCBinaryExpr::GTE;
1582     return 3;
1583
1584   // Low Intermediate Precedence: +, -
1585   case AsmToken::Plus:
1586     Kind = MCBinaryExpr::Add;
1587     return 4;
1588   case AsmToken::Minus:
1589     Kind = MCBinaryExpr::Sub;
1590     return 4;
1591
1592   // High Intermediate Precedence: |, &, ^
1593   //
1594   // FIXME: gas seems to support '!' as an infix operator?
1595   case AsmToken::Pipe:
1596     Kind = MCBinaryExpr::Or;
1597     return 5;
1598   case AsmToken::Caret:
1599     Kind = MCBinaryExpr::Xor;
1600     return 5;
1601   case AsmToken::Amp:
1602     Kind = MCBinaryExpr::And;
1603     return 5;
1604
1605   // Highest Precedence: *, /, %, <<, >>
1606   case AsmToken::Star:
1607     Kind = MCBinaryExpr::Mul;
1608     return 6;
1609   case AsmToken::Slash:
1610     Kind = MCBinaryExpr::Div;
1611     return 6;
1612   case AsmToken::Percent:
1613     Kind = MCBinaryExpr::Mod;
1614     return 6;
1615   case AsmToken::LessLess:
1616     Kind = MCBinaryExpr::Shl;
1617     return 6;
1618   case AsmToken::GreaterGreater:
1619     Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
1620     return 6;
1621   }
1622 }
1623
1624 unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K,
1625                                        MCBinaryExpr::Opcode &Kind) {
1626   bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr();
1627   return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr)
1628                   : getGNUBinOpPrecedence(K, Kind, ShouldUseLogicalShr);
1629 }
1630
1631 /// Parse all binary operators with precedence >= 'Precedence'.
1632 /// Res contains the LHS of the expression on input.
1633 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1634                               SMLoc &EndLoc) {
1635   SMLoc StartLoc = Lexer.getLoc();
1636   while (true) {
1637     MCBinaryExpr::Opcode Kind = MCBinaryExpr::Add;
1638     unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1639
1640     // If the next token is lower precedence than we are allowed to eat, return
1641     // successfully with what we ate already.
1642     if (TokPrec < Precedence)
1643       return false;
1644
1645     Lex();
1646
1647     // Eat the next primary expression.
1648     const MCExpr *RHS;
1649     if (getTargetParser().parsePrimaryExpr(RHS, EndLoc))
1650       return true;
1651
1652     // If BinOp binds less tightly with RHS than the operator after RHS, let
1653     // the pending operator take RHS as its LHS.
1654     MCBinaryExpr::Opcode Dummy;
1655     unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1656     if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc))
1657       return true;
1658
1659     // Merge LHS and RHS according to operator.
1660     Res = MCBinaryExpr::create(Kind, Res, RHS, getContext(), StartLoc);
1661   }
1662 }
1663
1664 /// ParseStatement:
1665 ///   ::= EndOfStatement
1666 ///   ::= Label* Directive ...Operands... EndOfStatement
1667 ///   ::= Label* Identifier OperandList* EndOfStatement
1668 bool AsmParser::parseStatement(ParseStatementInfo &Info,
1669                                MCAsmParserSemaCallback *SI) {
1670   assert(!hasPendingError() && "parseStatement started with pending error");
1671   // Eat initial spaces and comments
1672   while (Lexer.is(AsmToken::Space))
1673     Lex();
1674   if (Lexer.is(AsmToken::EndOfStatement)) {
1675     // if this is a line comment we can drop it safely
1676     if (getTok().getString().empty() || getTok().getString().front() == '\r' ||
1677         getTok().getString().front() == '\n')
1678       Out.AddBlankLine();
1679     Lex();
1680     return false;
1681   }
1682   // Statements always start with an identifier.
1683   AsmToken ID = getTok();
1684   SMLoc IDLoc = ID.getLoc();
1685   StringRef IDVal;
1686   int64_t LocalLabelVal = -1;
1687   if (Lexer.is(AsmToken::HashDirective))
1688     return parseCppHashLineFilenameComment(IDLoc);
1689   // Allow an integer followed by a ':' as a directional local label.
1690   if (Lexer.is(AsmToken::Integer)) {
1691     LocalLabelVal = getTok().getIntVal();
1692     if (LocalLabelVal < 0) {
1693       if (!TheCondState.Ignore) {
1694         Lex(); // always eat a token
1695         return Error(IDLoc, "unexpected token at start of statement");
1696       }
1697       IDVal = "";
1698     } else {
1699       IDVal = getTok().getString();
1700       Lex(); // Consume the integer token to be used as an identifier token.
1701       if (Lexer.getKind() != AsmToken::Colon) {
1702         if (!TheCondState.Ignore) {
1703           Lex(); // always eat a token
1704           return Error(IDLoc, "unexpected token at start of statement");
1705         }
1706       }
1707     }
1708   } else if (Lexer.is(AsmToken::Dot)) {
1709     // Treat '.' as a valid identifier in this context.
1710     Lex();
1711     IDVal = ".";
1712   } else if (Lexer.is(AsmToken::LCurly)) {
1713     // Treat '{' as a valid identifier in this context.
1714     Lex();
1715     IDVal = "{";
1716
1717   } else if (Lexer.is(AsmToken::RCurly)) {
1718     // Treat '}' as a valid identifier in this context.
1719     Lex();
1720     IDVal = "}";
1721   } else if (Lexer.is(AsmToken::Star) &&
1722              getTargetParser().starIsStartOfStatement()) {
1723     // Accept '*' as a valid start of statement.
1724     Lex();
1725     IDVal = "*";
1726   } else if (parseIdentifier(IDVal)) {
1727     if (!TheCondState.Ignore) {
1728       Lex(); // always eat a token
1729       return Error(IDLoc, "unexpected token at start of statement");
1730     }
1731     IDVal = "";
1732   }
1733
1734   // Handle conditional assembly here before checking for skipping.  We
1735   // have to do this so that .endif isn't skipped in a ".if 0" block for
1736   // example.
1737   StringMap<DirectiveKind>::const_iterator DirKindIt =
1738       DirectiveKindMap.find(IDVal);
1739   DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
1740                               ? DK_NO_DIRECTIVE
1741                               : DirKindIt->getValue();
1742   switch (DirKind) {
1743   default:
1744     break;
1745   case DK_IF:
1746   case DK_IFEQ:
1747   case DK_IFGE:
1748   case DK_IFGT:
1749   case DK_IFLE:
1750   case DK_IFLT:
1751   case DK_IFNE:
1752     return parseDirectiveIf(IDLoc, DirKind);
1753   case DK_IFB:
1754     return parseDirectiveIfb(IDLoc, true);
1755   case DK_IFNB:
1756     return parseDirectiveIfb(IDLoc, false);
1757   case DK_IFC:
1758     return parseDirectiveIfc(IDLoc, true);
1759   case DK_IFEQS:
1760     return parseDirectiveIfeqs(IDLoc, true);
1761   case DK_IFNC:
1762     return parseDirectiveIfc(IDLoc, false);
1763   case DK_IFNES:
1764     return parseDirectiveIfeqs(IDLoc, false);
1765   case DK_IFDEF:
1766     return parseDirectiveIfdef(IDLoc, true);
1767   case DK_IFNDEF:
1768   case DK_IFNOTDEF:
1769     return parseDirectiveIfdef(IDLoc, false);
1770   case DK_ELSEIF:
1771     return parseDirectiveElseIf(IDLoc);
1772   case DK_ELSE:
1773     return parseDirectiveElse(IDLoc);
1774   case DK_ENDIF:
1775     return parseDirectiveEndIf(IDLoc);
1776   }
1777
1778   // Ignore the statement if in the middle of inactive conditional
1779   // (e.g. ".if 0").
1780   if (TheCondState.Ignore) {
1781     eatToEndOfStatement();
1782     return false;
1783   }
1784
1785   // FIXME: Recurse on local labels?
1786
1787   // See what kind of statement we have.
1788   switch (Lexer.getKind()) {
1789   case AsmToken::Colon: {
1790     if (!getTargetParser().isLabel(ID))
1791       break;
1792     if (checkForValidSection())
1793       return true;
1794
1795     // identifier ':'   -> Label.
1796     Lex();
1797
1798     // Diagnose attempt to use '.' as a label.
1799     if (IDVal == ".")
1800       return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1801
1802     // Diagnose attempt to use a variable as a label.
1803     //
1804     // FIXME: Diagnostics. Note the location of the definition as a label.
1805     // FIXME: This doesn't diagnose assignment to a symbol which has been
1806     // implicitly marked as external.
1807     MCSymbol *Sym;
1808     if (LocalLabelVal == -1) {
1809       if (ParsingInlineAsm && SI) {
1810         StringRef RewrittenLabel =
1811             SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true);
1812         assert(!RewrittenLabel.empty() &&
1813                "We should have an internal name here.");
1814         Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(),
1815                                        RewrittenLabel);
1816         IDVal = RewrittenLabel;
1817       }
1818       Sym = getContext().getOrCreateSymbol(IDVal);
1819     } else
1820       Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal);
1821     // End of Labels should be treated as end of line for lexing
1822     // purposes but that information is not available to the Lexer who
1823     // does not understand Labels. This may cause us to see a Hash
1824     // here instead of a preprocessor line comment.
1825     if (getTok().is(AsmToken::Hash)) {
1826       StringRef CommentStr = parseStringToEndOfStatement();
1827       Lexer.Lex();
1828       Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr));
1829     }
1830
1831     // Consume any end of statement token, if present, to avoid spurious
1832     // AddBlankLine calls().
1833     if (getTok().is(AsmToken::EndOfStatement)) {
1834       Lex();
1835     }
1836
1837     getTargetParser().doBeforeLabelEmit(Sym);
1838
1839     // Emit the label.
1840     if (!getTargetParser().isParsingInlineAsm())
1841       Out.EmitLabel(Sym, IDLoc);
1842
1843     // If we are generating dwarf for assembly source files then gather the
1844     // info to make a dwarf label entry for this label if needed.
1845     if (enabledGenDwarfForAssembly())
1846       MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1847                                  IDLoc);
1848
1849     getTargetParser().onLabelParsed(Sym);
1850
1851     return false;
1852   }
1853
1854   case AsmToken::Equal:
1855     if (!getTargetParser().equalIsAsmAssignment())
1856       break;
1857     // identifier '=' ... -> assignment statement
1858     Lex();
1859
1860     return parseAssignment(IDVal, true);
1861
1862   default: // Normal instruction or directive.
1863     break;
1864   }
1865
1866   // If macros are enabled, check to see if this is a macro instantiation.
1867   if (areMacrosEnabled())
1868     if (const MCAsmMacro *M = getContext().lookupMacro(IDVal)) {
1869       return handleMacroEntry(M, IDLoc);
1870     }
1871
1872   // Otherwise, we have a normal instruction or directive.
1873
1874   // Directives start with "."
1875   if (IDVal.startswith(".") && IDVal != ".") {
1876     // There are several entities interested in parsing directives:
1877     //
1878     // 1. The target-specific assembly parser. Some directives are target
1879     //    specific or may potentially behave differently on certain targets.
1880     // 2. Asm parser extensions. For example, platform-specific parsers
1881     //    (like the ELF parser) register themselves as extensions.
1882     // 3. The generic directive parser implemented by this class. These are
1883     //    all the directives that behave in a target and platform independent
1884     //    manner, or at least have a default behavior that's shared between
1885     //    all targets and platforms.
1886
1887     getTargetParser().flushPendingInstructions(getStreamer());
1888
1889     SMLoc StartTokLoc = getTok().getLoc();
1890     bool TPDirectiveReturn = getTargetParser().ParseDirective(ID);
1891
1892     if (hasPendingError())
1893       return true;
1894     // Currently the return value should be true if we are
1895     // uninterested but as this is at odds with the standard parsing
1896     // convention (return true = error) we have instances of a parsed
1897     // directive that fails returning true as an error. Catch these
1898     // cases as best as possible errors here.
1899     if (TPDirectiveReturn && StartTokLoc != getTok().getLoc())
1900       return true;
1901     // Return if we did some parsing or believe we succeeded.
1902     if (!TPDirectiveReturn || StartTokLoc != getTok().getLoc())
1903       return false;
1904
1905     // Next, check the extension directive map to see if any extension has
1906     // registered itself to parse this directive.
1907     std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
1908         ExtensionDirectiveMap.lookup(IDVal);
1909     if (Handler.first)
1910       return (*Handler.second)(Handler.first, IDVal, IDLoc);
1911
1912     // Finally, if no one else is interested in this directive, it must be
1913     // generic and familiar to this class.
1914     switch (DirKind) {
1915     default:
1916       break;
1917     case DK_SET:
1918     case DK_EQU:
1919       return parseDirectiveSet(IDVal, true);
1920     case DK_EQUIV:
1921       return parseDirectiveSet(IDVal, false);
1922     case DK_ASCII:
1923       return parseDirectiveAscii(IDVal, false);
1924     case DK_ASCIZ:
1925     case DK_STRING:
1926       return parseDirectiveAscii(IDVal, true);
1927     case DK_BYTE:
1928     case DK_DC_B:
1929       return parseDirectiveValue(IDVal, 1);
1930     case DK_DC:
1931     case DK_DC_W:
1932     case DK_SHORT:
1933     case DK_VALUE:
1934     case DK_2BYTE:
1935       return parseDirectiveValue(IDVal, 2);
1936     case DK_LONG:
1937     case DK_INT:
1938     case DK_4BYTE:
1939     case DK_DC_L:
1940       return parseDirectiveValue(IDVal, 4);
1941     case DK_QUAD:
1942     case DK_8BYTE:
1943       return parseDirectiveValue(IDVal, 8);
1944     case DK_DC_A:
1945       return parseDirectiveValue(
1946           IDVal, getContext().getAsmInfo()->getCodePointerSize());
1947     case DK_OCTA:
1948       return parseDirectiveOctaValue(IDVal);
1949     case DK_SINGLE:
1950     case DK_FLOAT:
1951     case DK_DC_S:
1952       return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle());
1953     case DK_DOUBLE:
1954     case DK_DC_D:
1955       return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble());
1956     case DK_ALIGN: {
1957       bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1958       return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
1959     }
1960     case DK_ALIGN32: {
1961       bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
1962       return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
1963     }
1964     case DK_BALIGN:
1965       return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
1966     case DK_BALIGNW:
1967       return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
1968     case DK_BALIGNL:
1969       return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
1970     case DK_P2ALIGN:
1971       return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
1972     case DK_P2ALIGNW:
1973       return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
1974     case DK_P2ALIGNL:
1975       return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
1976     case DK_ORG:
1977       return parseDirectiveOrg();
1978     case DK_FILL:
1979       return parseDirectiveFill();
1980     case DK_ZERO:
1981       return parseDirectiveZero();
1982     case DK_EXTERN:
1983       eatToEndOfStatement(); // .extern is the default, ignore it.
1984       return false;
1985     case DK_GLOBL:
1986     case DK_GLOBAL:
1987       return parseDirectiveSymbolAttribute(MCSA_Global);
1988     case DK_LAZY_REFERENCE:
1989       return parseDirectiveSymbolAttribute(MCSA_LazyReference);
1990     case DK_NO_DEAD_STRIP:
1991       return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
1992     case DK_SYMBOL_RESOLVER:
1993       return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
1994     case DK_PRIVATE_EXTERN:
1995       return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
1996     case DK_REFERENCE:
1997       return parseDirectiveSymbolAttribute(MCSA_Reference);
1998     case DK_WEAK_DEFINITION:
1999       return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
2000     case DK_WEAK_REFERENCE:
2001       return parseDirectiveSymbolAttribute(MCSA_WeakReference);
2002     case DK_WEAK_DEF_CAN_BE_HIDDEN:
2003       return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
2004     case DK_COLD:
2005       return parseDirectiveSymbolAttribute(MCSA_Cold);
2006     case DK_COMM:
2007     case DK_COMMON:
2008       return parseDirectiveComm(/*IsLocal=*/false);
2009     case DK_LCOMM:
2010       return parseDirectiveComm(/*IsLocal=*/true);
2011     case DK_ABORT:
2012       return parseDirectiveAbort();
2013     case DK_INCLUDE:
2014       return parseDirectiveInclude();
2015     case DK_INCBIN:
2016       return parseDirectiveIncbin();
2017     case DK_CODE16:
2018     case DK_CODE16GCC:
2019       return TokError(Twine(IDVal) +
2020                       " not currently supported for this target");
2021     case DK_REPT:
2022       return parseDirectiveRept(IDLoc, IDVal);
2023     case DK_IRP:
2024       return parseDirectiveIrp(IDLoc);
2025     case DK_IRPC:
2026       return parseDirectiveIrpc(IDLoc);
2027     case DK_ENDR:
2028       return parseDirectiveEndr(IDLoc);
2029     case DK_BUNDLE_ALIGN_MODE:
2030       return parseDirectiveBundleAlignMode();
2031     case DK_BUNDLE_LOCK:
2032       return parseDirectiveBundleLock();
2033     case DK_BUNDLE_UNLOCK:
2034       return parseDirectiveBundleUnlock();
2035     case DK_SLEB128:
2036       return parseDirectiveLEB128(true);
2037     case DK_ULEB128:
2038       return parseDirectiveLEB128(false);
2039     case DK_SPACE:
2040     case DK_SKIP:
2041       return parseDirectiveSpace(IDVal);
2042     case DK_FILE:
2043       return parseDirectiveFile(IDLoc);
2044     case DK_LINE:
2045       return parseDirectiveLine();
2046     case DK_LOC:
2047       return parseDirectiveLoc();
2048     case DK_STABS:
2049       return parseDirectiveStabs();
2050     case DK_CV_FILE:
2051       return parseDirectiveCVFile();
2052     case DK_CV_FUNC_ID:
2053       return parseDirectiveCVFuncId();
2054     case DK_CV_INLINE_SITE_ID:
2055       return parseDirectiveCVInlineSiteId();
2056     case DK_CV_LOC:
2057       return parseDirectiveCVLoc();
2058     case DK_CV_LINETABLE:
2059       return parseDirectiveCVLinetable();
2060     case DK_CV_INLINE_LINETABLE:
2061       return parseDirectiveCVInlineLinetable();
2062     case DK_CV_DEF_RANGE:
2063       return parseDirectiveCVDefRange();
2064     case DK_CV_STRING:
2065       return parseDirectiveCVString();
2066     case DK_CV_STRINGTABLE:
2067       return parseDirectiveCVStringTable();
2068     case DK_CV_FILECHECKSUMS:
2069       return parseDirectiveCVFileChecksums();
2070     case DK_CV_FILECHECKSUM_OFFSET:
2071       return parseDirectiveCVFileChecksumOffset();
2072     case DK_CV_FPO_DATA:
2073       return parseDirectiveCVFPOData();
2074     case DK_CFI_SECTIONS:
2075       return parseDirectiveCFISections();
2076     case DK_CFI_STARTPROC:
2077       return parseDirectiveCFIStartProc();
2078     case DK_CFI_ENDPROC:
2079       return parseDirectiveCFIEndProc();
2080     case DK_CFI_DEF_CFA:
2081       return parseDirectiveCFIDefCfa(IDLoc);
2082     case DK_CFI_DEF_CFA_OFFSET:
2083       return parseDirectiveCFIDefCfaOffset();
2084     case DK_CFI_ADJUST_CFA_OFFSET:
2085       return parseDirectiveCFIAdjustCfaOffset();
2086     case DK_CFI_DEF_CFA_REGISTER:
2087       return parseDirectiveCFIDefCfaRegister(IDLoc);
2088     case DK_CFI_OFFSET:
2089       return parseDirectiveCFIOffset(IDLoc);
2090     case DK_CFI_REL_OFFSET:
2091       return parseDirectiveCFIRelOffset(IDLoc);
2092     case DK_CFI_PERSONALITY:
2093       return parseDirectiveCFIPersonalityOrLsda(true);
2094     case DK_CFI_LSDA:
2095       return parseDirectiveCFIPersonalityOrLsda(false);
2096     case DK_CFI_REMEMBER_STATE:
2097       return parseDirectiveCFIRememberState();
2098     case DK_CFI_RESTORE_STATE:
2099       return parseDirectiveCFIRestoreState();
2100     case DK_CFI_SAME_VALUE:
2101       return parseDirectiveCFISameValue(IDLoc);
2102     case DK_CFI_RESTORE:
2103       return parseDirectiveCFIRestore(IDLoc);
2104     case DK_CFI_ESCAPE:
2105       return parseDirectiveCFIEscape();
2106     case DK_CFI_RETURN_COLUMN:
2107       return parseDirectiveCFIReturnColumn(IDLoc);
2108     case DK_CFI_SIGNAL_FRAME:
2109       return parseDirectiveCFISignalFrame();
2110     case DK_CFI_UNDEFINED:
2111       return parseDirectiveCFIUndefined(IDLoc);
2112     case DK_CFI_REGISTER:
2113       return parseDirectiveCFIRegister(IDLoc);
2114     case DK_CFI_WINDOW_SAVE:
2115       return parseDirectiveCFIWindowSave();
2116     case DK_MACROS_ON:
2117     case DK_MACROS_OFF:
2118       return parseDirectiveMacrosOnOff(IDVal);
2119     case DK_MACRO:
2120       return parseDirectiveMacro(IDLoc);
2121     case DK_ALTMACRO:
2122     case DK_NOALTMACRO:
2123       return parseDirectiveAltmacro(IDVal);
2124     case DK_EXITM:
2125       return parseDirectiveExitMacro(IDVal);
2126     case DK_ENDM:
2127     case DK_ENDMACRO:
2128       return parseDirectiveEndMacro(IDVal);
2129     case DK_PURGEM:
2130       return parseDirectivePurgeMacro(IDLoc);
2131     case DK_END:
2132       return parseDirectiveEnd(IDLoc);
2133     case DK_ERR:
2134       return parseDirectiveError(IDLoc, false);
2135     case DK_ERROR:
2136       return parseDirectiveError(IDLoc, true);
2137     case DK_WARNING:
2138       return parseDirectiveWarning(IDLoc);
2139     case DK_RELOC:
2140       return parseDirectiveReloc(IDLoc);
2141     case DK_DCB:
2142     case DK_DCB_W:
2143       return parseDirectiveDCB(IDVal, 2);
2144     case DK_DCB_B:
2145       return parseDirectiveDCB(IDVal, 1);
2146     case DK_DCB_D:
2147       return parseDirectiveRealDCB(IDVal, APFloat::IEEEdouble());
2148     case DK_DCB_L:
2149       return parseDirectiveDCB(IDVal, 4);
2150     case DK_DCB_S:
2151       return parseDirectiveRealDCB(IDVal, APFloat::IEEEsingle());
2152     case DK_DC_X:
2153     case DK_DCB_X:
2154       return TokError(Twine(IDVal) +
2155                       " not currently supported for this target");
2156     case DK_DS:
2157     case DK_DS_W:
2158       return parseDirectiveDS(IDVal, 2);
2159     case DK_DS_B:
2160       return parseDirectiveDS(IDVal, 1);
2161     case DK_DS_D:
2162       return parseDirectiveDS(IDVal, 8);
2163     case DK_DS_L:
2164     case DK_DS_S:
2165       return parseDirectiveDS(IDVal, 4);
2166     case DK_DS_P:
2167     case DK_DS_X:
2168       return parseDirectiveDS(IDVal, 12);
2169     case DK_PRINT:
2170       return parseDirectivePrint(IDLoc);
2171     case DK_ADDRSIG:
2172       return parseDirectiveAddrsig();
2173     case DK_ADDRSIG_SYM:
2174       return parseDirectiveAddrsigSym();
2175     }
2176
2177     return Error(IDLoc, "unknown directive");
2178   }
2179
2180   // __asm _emit or __asm __emit
2181   if (ParsingInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
2182                            IDVal == "_EMIT" || IDVal == "__EMIT"))
2183     return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
2184
2185   // __asm align
2186   if (ParsingInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
2187     return parseDirectiveMSAlign(IDLoc, Info);
2188
2189   if (ParsingInlineAsm && (IDVal == "even" || IDVal == "EVEN"))
2190     Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4);
2191   if (checkForValidSection())
2192     return true;
2193
2194   // Canonicalize the opcode to lower case.
2195   std::string OpcodeStr = IDVal.lower();
2196   ParseInstructionInfo IInfo(Info.AsmRewrites);
2197   bool ParseHadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID,
2198                                                           Info.ParsedOperands);
2199   Info.ParseError = ParseHadError;
2200
2201   // Dump the parsed representation, if requested.
2202   if (getShowParsedOperands()) {
2203     SmallString<256> Str;
2204     raw_svector_ostream OS(Str);
2205     OS << "parsed instruction: [";
2206     for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
2207       if (i != 0)
2208         OS << ", ";
2209       Info.ParsedOperands[i]->print(OS);
2210     }
2211     OS << "]";
2212
2213     printMessage(IDLoc, SourceMgr::DK_Note, OS.str());
2214   }
2215
2216   // Fail even if ParseInstruction erroneously returns false.
2217   if (hasPendingError() || ParseHadError)
2218     return true;
2219
2220   // If we are generating dwarf for the current section then generate a .loc
2221   // directive for the instruction.
2222   if (!ParseHadError && enabledGenDwarfForAssembly() &&
2223       getContext().getGenDwarfSectionSyms().count(
2224           getStreamer().getCurrentSectionOnly())) {
2225     unsigned Line;
2226     if (ActiveMacros.empty())
2227       Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
2228     else
2229       Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc,
2230                                    ActiveMacros.front()->ExitBuffer);
2231
2232     // If we previously parsed a cpp hash file line comment then make sure the
2233     // current Dwarf File is for the CppHashFilename if not then emit the
2234     // Dwarf File table for it and adjust the line number for the .loc.
2235     if (!CppHashInfo.Filename.empty()) {
2236       unsigned FileNumber = getStreamer().EmitDwarfFileDirective(
2237           0, StringRef(), CppHashInfo.Filename);
2238       getContext().setGenDwarfFileNumber(FileNumber);
2239
2240       unsigned CppHashLocLineNo =
2241         SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf);
2242       Line = CppHashInfo.LineNumber - 1 + (Line - CppHashLocLineNo);
2243     }
2244
2245     getStreamer().EmitDwarfLocDirective(
2246         getContext().getGenDwarfFileNumber(), Line, 0,
2247         DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0, 0, 0,
2248         StringRef());
2249   }
2250
2251   // If parsing succeeded, match the instruction.
2252   if (!ParseHadError) {
2253     uint64_t ErrorInfo;
2254     if (getTargetParser().MatchAndEmitInstruction(
2255             IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo,
2256             getTargetParser().isParsingInlineAsm()))
2257       return true;
2258   }
2259   return false;
2260 }
2261
2262 // Parse and erase curly braces marking block start/end
2263 bool
2264 AsmParser::parseCurlyBlockScope(SmallVectorImpl<AsmRewrite> &AsmStrRewrites) {
2265   // Identify curly brace marking block start/end
2266   if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly))
2267     return false;
2268
2269   SMLoc StartLoc = Lexer.getLoc();
2270   Lex(); // Eat the brace
2271   if (Lexer.is(AsmToken::EndOfStatement))
2272     Lex(); // Eat EndOfStatement following the brace
2273
2274   // Erase the block start/end brace from the output asm string
2275   AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() -
2276                                                   StartLoc.getPointer());
2277   return true;
2278 }
2279
2280 /// parseCppHashLineFilenameComment as this:
2281 ///   ::= # number "filename"
2282 bool AsmParser::parseCppHashLineFilenameComment(SMLoc L) {
2283   Lex(); // Eat the hash token.
2284   // Lexer only ever emits HashDirective if it fully formed if it's
2285   // done the checking already so this is an internal error.
2286   assert(getTok().is(AsmToken::Integer) &&
2287          "Lexing Cpp line comment: Expected Integer");
2288   int64_t LineNumber = getTok().getIntVal();
2289   Lex();
2290   assert(getTok().is(AsmToken::String) &&
2291          "Lexing Cpp line comment: Expected String");
2292   StringRef Filename = getTok().getString();
2293   Lex();
2294
2295   // Get rid of the enclosing quotes.
2296   Filename = Filename.substr(1, Filename.size() - 2);
2297
2298   // Save the SMLoc, Filename and LineNumber for later use by diagnostics
2299   // and possibly DWARF file info.
2300   CppHashInfo.Loc = L;
2301   CppHashInfo.Filename = Filename;
2302   CppHashInfo.LineNumber = LineNumber;
2303   CppHashInfo.Buf = CurBuffer;
2304   if (FirstCppHashFilename.empty())
2305     FirstCppHashFilename = Filename;
2306   return false;
2307 }
2308
2309 /// will use the last parsed cpp hash line filename comment
2310 /// for the Filename and LineNo if any in the diagnostic.
2311 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
2312   const AsmParser *Parser = static_cast<const AsmParser *>(Context);
2313   raw_ostream &OS = errs();
2314
2315   const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
2316   SMLoc DiagLoc = Diag.getLoc();
2317   unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
2318   unsigned CppHashBuf =
2319       Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashInfo.Loc);
2320
2321   // Like SourceMgr::printMessage() we need to print the include stack if any
2322   // before printing the message.
2323   unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
2324   if (!Parser->SavedDiagHandler && DiagCurBuffer &&
2325       DiagCurBuffer != DiagSrcMgr.getMainFileID()) {
2326     SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
2327     DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
2328   }
2329
2330   // If we have not parsed a cpp hash line filename comment or the source
2331   // manager changed or buffer changed (like in a nested include) then just
2332   // print the normal diagnostic using its Filename and LineNo.
2333   if (!Parser->CppHashInfo.LineNumber || &DiagSrcMgr != &Parser->SrcMgr ||
2334       DiagBuf != CppHashBuf) {
2335     if (Parser->SavedDiagHandler)
2336       Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
2337     else
2338       Diag.print(nullptr, OS);
2339     return;
2340   }
2341
2342   // Use the CppHashFilename and calculate a line number based on the
2343   // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc
2344   // for the diagnostic.
2345   const std::string &Filename = Parser->CppHashInfo.Filename;
2346
2347   int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
2348   int CppHashLocLineNo =
2349       Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf);
2350   int LineNo =
2351       Parser->CppHashInfo.LineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo);
2352
2353   SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo,
2354                        Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(),
2355                        Diag.getLineContents(), Diag.getRanges());
2356
2357   if (Parser->SavedDiagHandler)
2358     Parser->SavedDiagHandler(NewDiag, Parser->SavedDiagContext);
2359   else
2360     NewDiag.print(nullptr, OS);
2361 }
2362
2363 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
2364 // difference being that that function accepts '@' as part of identifiers and
2365 // we can't do that. AsmLexer.cpp should probably be changed to handle
2366 // '@' as a special case when needed.
2367 static bool isIdentifierChar(char c) {
2368   return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
2369          c == '.';
2370 }
2371
2372 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
2373                             ArrayRef<MCAsmMacroParameter> Parameters,
2374                             ArrayRef<MCAsmMacroArgument> A,
2375                             bool EnableAtPseudoVariable, SMLoc L) {
2376   unsigned NParameters = Parameters.size();
2377   bool HasVararg = NParameters ? Parameters.back().Vararg : false;
2378   if ((!IsDarwin || NParameters != 0) && NParameters != A.size())
2379     return Error(L, "Wrong number of arguments");
2380
2381   // A macro without parameters is handled differently on Darwin:
2382   // gas accepts no arguments and does no substitutions
2383   while (!Body.empty()) {
2384     // Scan for the next substitution.
2385     std::size_t End = Body.size(), Pos = 0;
2386     for (; Pos != End; ++Pos) {
2387       // Check for a substitution or escape.
2388       if (IsDarwin && !NParameters) {
2389         // This macro has no parameters, look for $0, $1, etc.
2390         if (Body[Pos] != '$' || Pos + 1 == End)
2391           continue;
2392
2393         char Next = Body[Pos + 1];
2394         if (Next == '$' || Next == 'n' ||
2395             isdigit(static_cast<unsigned char>(Next)))
2396           break;
2397       } else {
2398         // This macro has parameters, look for \foo, \bar, etc.
2399         if (Body[Pos] == '\\' && Pos + 1 != End)
2400           break;
2401       }
2402     }
2403
2404     // Add the prefix.
2405     OS << Body.slice(0, Pos);
2406
2407     // Check if we reached the end.
2408     if (Pos == End)
2409       break;
2410
2411     if (IsDarwin && !NParameters) {
2412       switch (Body[Pos + 1]) {
2413       // $$ => $
2414       case '$':
2415         OS << '$';
2416         break;
2417
2418       // $n => number of arguments
2419       case 'n':
2420         OS << A.size();
2421         break;
2422
2423       // $[0-9] => argument
2424       default: {
2425         // Missing arguments are ignored.
2426         unsigned Index = Body[Pos + 1] - '0';
2427         if (Index >= A.size())
2428           break;
2429
2430         // Otherwise substitute with the token values, with spaces eliminated.
2431         for (const AsmToken &Token : A[Index])
2432           OS << Token.getString();
2433         break;
2434       }
2435       }
2436       Pos += 2;
2437     } else {
2438       unsigned I = Pos + 1;
2439
2440       // Check for the \@ pseudo-variable.
2441       if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End)
2442         ++I;
2443       else
2444         while (isIdentifierChar(Body[I]) && I + 1 != End)
2445           ++I;
2446
2447       const char *Begin = Body.data() + Pos + 1;
2448       StringRef Argument(Begin, I - (Pos + 1));
2449       unsigned Index = 0;
2450
2451       if (Argument == "@") {
2452         OS << NumOfMacroInstantiations;
2453         Pos += 2;
2454       } else {
2455         for (; Index < NParameters; ++Index)
2456           if (Parameters[Index].Name == Argument)
2457             break;
2458
2459         if (Index == NParameters) {
2460           if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
2461             Pos += 3;
2462           else {
2463             OS << '\\' << Argument;
2464             Pos = I;
2465           }
2466         } else {
2467           bool VarargParameter = HasVararg && Index == (NParameters - 1);
2468           for (const AsmToken &Token : A[Index])
2469             // For altmacro mode, you can write '%expr'.
2470             // The prefix '%' evaluates the expression 'expr'
2471             // and uses the result as a string (e.g. replace %(1+2) with the
2472             // string "3").
2473             // Here, we identify the integer token which is the result of the
2474             // absolute expression evaluation and replace it with its string
2475             // representation.
2476             if (AltMacroMode && Token.getString().front() == '%' &&
2477                 Token.is(AsmToken::Integer))
2478               // Emit an integer value to the buffer.
2479               OS << Token.getIntVal();
2480             // Only Token that was validated as a string and begins with '<'
2481             // is considered altMacroString!!!
2482             else if (AltMacroMode && Token.getString().front() == '<' &&
2483                      Token.is(AsmToken::String)) {
2484               OS << altMacroString(Token.getStringContents());
2485             }
2486             // We expect no quotes around the string's contents when
2487             // parsing for varargs.
2488             else if (Token.isNot(AsmToken::String) || VarargParameter)
2489               OS << Token.getString();
2490             else
2491               OS << Token.getStringContents();
2492
2493           Pos += 1 + Argument.size();
2494         }
2495       }
2496     }
2497     // Update the scan point.
2498     Body = Body.substr(Pos);
2499   }
2500
2501   return false;
2502 }
2503
2504 MacroInstantiation::MacroInstantiation(SMLoc IL, int EB, SMLoc EL,
2505                                        size_t CondStackDepth)
2506     : InstantiationLoc(IL), ExitBuffer(EB), ExitLoc(EL),
2507       CondStackDepth(CondStackDepth) {}
2508
2509 static bool isOperator(AsmToken::TokenKind kind) {
2510   switch (kind) {
2511   default:
2512     return false;
2513   case AsmToken::Plus:
2514   case AsmToken::Minus:
2515   case AsmToken::Tilde:
2516   case AsmToken::Slash:
2517   case AsmToken::Star:
2518   case AsmToken::Dot:
2519   case AsmToken::Equal:
2520   case AsmToken::EqualEqual:
2521   case AsmToken::Pipe:
2522   case AsmToken::PipePipe:
2523   case AsmToken::Caret:
2524   case AsmToken::Amp:
2525   case AsmToken::AmpAmp:
2526   case AsmToken::Exclaim:
2527   case AsmToken::ExclaimEqual:
2528   case AsmToken::Less:
2529   case AsmToken::LessEqual:
2530   case AsmToken::LessLess:
2531   case AsmToken::LessGreater:
2532   case AsmToken::Greater:
2533   case AsmToken::GreaterEqual:
2534   case AsmToken::GreaterGreater:
2535     return true;
2536   }
2537 }
2538
2539 namespace {
2540
2541 class AsmLexerSkipSpaceRAII {
2542 public:
2543   AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) {
2544     Lexer.setSkipSpace(SkipSpace);
2545   }
2546
2547   ~AsmLexerSkipSpaceRAII() {
2548     Lexer.setSkipSpace(true);
2549   }
2550
2551 private:
2552   AsmLexer &Lexer;
2553 };
2554
2555 } // end anonymous namespace
2556
2557 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) {
2558
2559   if (Vararg) {
2560     if (Lexer.isNot(AsmToken::EndOfStatement)) {
2561       StringRef Str = parseStringToEndOfStatement();
2562       MA.emplace_back(AsmToken::String, Str);
2563     }
2564     return false;
2565   }
2566
2567   unsigned ParenLevel = 0;
2568
2569   // Darwin doesn't use spaces to delmit arguments.
2570   AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin);
2571
2572   bool SpaceEaten;
2573
2574   while (true) {
2575     SpaceEaten = false;
2576     if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
2577       return TokError("unexpected token in macro instantiation");
2578
2579     if (ParenLevel == 0) {
2580
2581       if (Lexer.is(AsmToken::Comma))
2582         break;
2583
2584       if (Lexer.is(AsmToken::Space)) {
2585         SpaceEaten = true;
2586         Lexer.Lex(); // Eat spaces
2587       }
2588
2589       // Spaces can delimit parameters, but could also be part an expression.
2590       // If the token after a space is an operator, add the token and the next
2591       // one into this argument
2592       if (!IsDarwin) {
2593         if (isOperator(Lexer.getKind())) {
2594           MA.push_back(getTok());
2595           Lexer.Lex();
2596
2597           // Whitespace after an operator can be ignored.
2598           if (Lexer.is(AsmToken::Space))
2599             Lexer.Lex();
2600
2601           continue;
2602         }
2603       }
2604       if (SpaceEaten)
2605         break;
2606     }
2607
2608     // handleMacroEntry relies on not advancing the lexer here
2609     // to be able to fill in the remaining default parameter values
2610     if (Lexer.is(AsmToken::EndOfStatement))
2611       break;
2612
2613     // Adjust the current parentheses level.
2614     if (Lexer.is(AsmToken::LParen))
2615       ++ParenLevel;
2616     else if (Lexer.is(AsmToken::RParen) && ParenLevel)
2617       --ParenLevel;
2618
2619     // Append the token to the current argument list.
2620     MA.push_back(getTok());
2621     Lexer.Lex();
2622   }
2623
2624   if (ParenLevel != 0)
2625     return TokError("unbalanced parentheses in macro argument");
2626   return false;
2627 }
2628
2629 // Parse the macro instantiation arguments.
2630 bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
2631                                     MCAsmMacroArguments &A) {
2632   const unsigned NParameters = M ? M->Parameters.size() : 0;
2633   bool NamedParametersFound = false;
2634   SmallVector<SMLoc, 4> FALocs;
2635
2636   A.resize(NParameters);
2637   FALocs.resize(NParameters);
2638
2639   // Parse two kinds of macro invocations:
2640   // - macros defined without any parameters accept an arbitrary number of them
2641   // - macros defined with parameters accept at most that many of them
2642   bool HasVararg = NParameters ? M->Parameters.back().Vararg : false;
2643   for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
2644        ++Parameter) {
2645     SMLoc IDLoc = Lexer.getLoc();
2646     MCAsmMacroParameter FA;
2647
2648     if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) {
2649       if (parseIdentifier(FA.Name))
2650         return Error(IDLoc, "invalid argument identifier for formal argument");
2651
2652       if (Lexer.isNot(AsmToken::Equal))
2653         return TokError("expected '=' after formal parameter identifier");
2654
2655       Lex();
2656
2657       NamedParametersFound = true;
2658     }
2659     bool Vararg = HasVararg && Parameter == (NParameters - 1);
2660
2661     if (NamedParametersFound && FA.Name.empty())
2662       return Error(IDLoc, "cannot mix positional and keyword arguments");
2663
2664     SMLoc StrLoc = Lexer.getLoc();
2665     SMLoc EndLoc;
2666     if (AltMacroMode && Lexer.is(AsmToken::Percent)) {
2667       const MCExpr *AbsoluteExp;
2668       int64_t Value;
2669       /// Eat '%'
2670       Lex();
2671       if (parseExpression(AbsoluteExp, EndLoc))
2672         return false;
2673       if (!AbsoluteExp->evaluateAsAbsolute(Value,
2674                                            getStreamer().getAssemblerPtr()))
2675         return Error(StrLoc, "expected absolute expression");
2676       const char *StrChar = StrLoc.getPointer();
2677       const char *EndChar = EndLoc.getPointer();
2678       AsmToken newToken(AsmToken::Integer,
2679                         StringRef(StrChar, EndChar - StrChar), Value);
2680       FA.Value.push_back(newToken);
2681     } else if (AltMacroMode && Lexer.is(AsmToken::Less) &&
2682                isAltmacroString(StrLoc, EndLoc)) {
2683       const char *StrChar = StrLoc.getPointer();
2684       const char *EndChar = EndLoc.getPointer();
2685       jumpToLoc(EndLoc, CurBuffer);
2686       /// Eat from '<' to '>'
2687       Lex();
2688       AsmToken newToken(AsmToken::String,
2689                         StringRef(StrChar, EndChar - StrChar));
2690       FA.Value.push_back(newToken);
2691     } else if(parseMacroArgument(FA.Value, Vararg))
2692       return true;
2693
2694     unsigned PI = Parameter;
2695     if (!FA.Name.empty()) {
2696       unsigned FAI = 0;
2697       for (FAI = 0; FAI < NParameters; ++FAI)
2698         if (M->Parameters[FAI].Name == FA.Name)
2699           break;
2700
2701       if (FAI >= NParameters) {
2702         assert(M && "expected macro to be defined");
2703         return Error(IDLoc, "parameter named '" + FA.Name +
2704                                 "' does not exist for macro '" + M->Name + "'");
2705       }
2706       PI = FAI;
2707     }
2708
2709     if (!FA.Value.empty()) {
2710       if (A.size() <= PI)
2711         A.resize(PI + 1);
2712       A[PI] = FA.Value;
2713
2714       if (FALocs.size() <= PI)
2715         FALocs.resize(PI + 1);
2716
2717       FALocs[PI] = Lexer.getLoc();
2718     }
2719
2720     // At the end of the statement, fill in remaining arguments that have
2721     // default values. If there aren't any, then the next argument is
2722     // required but missing
2723     if (Lexer.is(AsmToken::EndOfStatement)) {
2724       bool Failure = false;
2725       for (unsigned FAI = 0; FAI < NParameters; ++FAI) {
2726         if (A[FAI].empty()) {
2727           if (M->Parameters[FAI].Required) {
2728             Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(),
2729                   "missing value for required parameter "
2730                   "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'");
2731             Failure = true;
2732           }
2733
2734           if (!M->Parameters[FAI].Value.empty())
2735             A[FAI] = M->Parameters[FAI].Value;
2736         }
2737       }
2738       return Failure;
2739     }
2740
2741     if (Lexer.is(AsmToken::Comma))
2742       Lex();
2743   }
2744
2745   return TokError("too many positional arguments");
2746 }
2747
2748 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
2749   // Arbitrarily limit macro nesting depth (default matches 'as'). We can
2750   // eliminate this, although we should protect against infinite loops.
2751   unsigned MaxNestingDepth = AsmMacroMaxNestingDepth;
2752   if (ActiveMacros.size() == MaxNestingDepth) {
2753     std::ostringstream MaxNestingDepthError;
2754     MaxNestingDepthError << "macros cannot be nested more than "
2755                          << MaxNestingDepth << " levels deep."
2756                          << " Use -asm-macro-max-nesting-depth to increase "
2757                             "this limit.";
2758     return TokError(MaxNestingDepthError.str());
2759   }
2760
2761   MCAsmMacroArguments A;
2762   if (parseMacroArguments(M, A))
2763     return true;
2764
2765   // Macro instantiation is lexical, unfortunately. We construct a new buffer
2766   // to hold the macro body with substitutions.
2767   SmallString<256> Buf;
2768   StringRef Body = M->Body;
2769   raw_svector_ostream OS(Buf);
2770
2771   if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc()))
2772     return true;
2773
2774   // We include the .endmacro in the buffer as our cue to exit the macro
2775   // instantiation.
2776   OS << ".endmacro\n";
2777
2778   std::unique_ptr<MemoryBuffer> Instantiation =
2779       MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
2780
2781   // Create the macro instantiation object and add to the current macro
2782   // instantiation stack.
2783   MacroInstantiation *MI = new MacroInstantiation(
2784       NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
2785   ActiveMacros.push_back(MI);
2786
2787   ++NumOfMacroInstantiations;
2788
2789   // Jump to the macro instantiation and prime the lexer.
2790   CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
2791   Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
2792   Lex();
2793
2794   return false;
2795 }
2796
2797 void AsmParser::handleMacroExit() {
2798   // Jump to the EndOfStatement we should return to, and consume it.
2799   jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2800   Lex();
2801
2802   // Pop the instantiation entry.
2803   delete ActiveMacros.back();
2804   ActiveMacros.pop_back();
2805 }
2806
2807 bool AsmParser::parseAssignment(StringRef Name, bool allow_redef,
2808                                 bool NoDeadStrip) {
2809   MCSymbol *Sym;
2810   const MCExpr *Value;
2811   if (MCParserUtils::parseAssignmentExpression(Name, allow_redef, *this, Sym,
2812                                                Value))
2813     return true;
2814
2815   if (!Sym) {
2816     // In the case where we parse an expression starting with a '.', we will
2817     // not generate an error, nor will we create a symbol.  In this case we
2818     // should just return out.
2819     return false;
2820   }
2821
2822   // Do the assignment.
2823   Out.EmitAssignment(Sym, Value);
2824   if (NoDeadStrip)
2825     Out.EmitSymbolAttribute(Sym, MCSA_NoDeadStrip);
2826
2827   return false;
2828 }
2829
2830 /// parseIdentifier:
2831 ///   ::= identifier
2832 ///   ::= string
2833 bool AsmParser::parseIdentifier(StringRef &Res) {
2834   // The assembler has relaxed rules for accepting identifiers, in particular we
2835   // allow things like '.globl $foo' and '.def @feat.00', which would normally be
2836   // separate tokens. At this level, we have already lexed so we cannot (currently)
2837   // handle this as a context dependent token, instead we detect adjacent tokens
2838   // and return the combined identifier.
2839   if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
2840     SMLoc PrefixLoc = getLexer().getLoc();
2841
2842     // Consume the prefix character, and check for a following identifier.
2843
2844     AsmToken Buf[1];
2845     Lexer.peekTokens(Buf, false);
2846
2847     if (Buf[0].isNot(AsmToken::Identifier))
2848       return true;
2849
2850     // We have a '$' or '@' followed by an identifier, make sure they are adjacent.
2851     if (PrefixLoc.getPointer() + 1 != Buf[0].getLoc().getPointer())
2852       return true;
2853
2854     // eat $ or @
2855     Lexer.Lex(); // Lexer's Lex guarantees consecutive token.
2856     // Construct the joined identifier and consume the token.
2857     Res =
2858         StringRef(PrefixLoc.getPointer(), getTok().getIdentifier().size() + 1);
2859     Lex(); // Parser Lex to maintain invariants.
2860     return false;
2861   }
2862
2863   if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
2864     return true;
2865
2866   Res = getTok().getIdentifier();
2867
2868   Lex(); // Consume the identifier token.
2869
2870   return false;
2871 }
2872
2873 /// parseDirectiveSet:
2874 ///   ::= .equ identifier ',' expression
2875 ///   ::= .equiv identifier ',' expression
2876 ///   ::= .set identifier ',' expression
2877 bool AsmParser::parseDirectiveSet(StringRef IDVal, bool allow_redef) {
2878   StringRef Name;
2879   if (check(parseIdentifier(Name), "expected identifier") ||
2880       parseToken(AsmToken::Comma) || parseAssignment(Name, allow_redef, true))
2881     return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
2882   return false;
2883 }
2884
2885 bool AsmParser::parseEscapedString(std::string &Data) {
2886   if (check(getTok().isNot(AsmToken::String), "expected string"))
2887     return true;
2888
2889   Data = "";
2890   StringRef Str = getTok().getStringContents();
2891   for (unsigned i = 0, e = Str.size(); i != e; ++i) {
2892     if (Str[i] != '\\') {
2893       Data += Str[i];
2894       continue;
2895     }
2896
2897     // Recognize escaped characters. Note that this escape semantics currently
2898     // loosely follows Darwin 'as'. Notably, it doesn't support hex escapes.
2899     ++i;
2900     if (i == e)
2901       return TokError("unexpected backslash at end of string");
2902
2903     // Recognize octal sequences.
2904     if ((unsigned)(Str[i] - '0') <= 7) {
2905       // Consume up to three octal characters.
2906       unsigned Value = Str[i] - '0';
2907
2908       if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2909         ++i;
2910         Value = Value * 8 + (Str[i] - '0');
2911
2912         if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
2913           ++i;
2914           Value = Value * 8 + (Str[i] - '0');
2915         }
2916       }
2917
2918       if (Value > 255)
2919         return TokError("invalid octal escape sequence (out of range)");
2920
2921       Data += (unsigned char)Value;
2922       continue;
2923     }
2924
2925     // Otherwise recognize individual escapes.
2926     switch (Str[i]) {
2927     default:
2928       // Just reject invalid escape sequences for now.
2929       return TokError("invalid escape sequence (unrecognized character)");
2930
2931     case 'b': Data += '\b'; break;
2932     case 'f': Data += '\f'; break;
2933     case 'n': Data += '\n'; break;
2934     case 'r': Data += '\r'; break;
2935     case 't': Data += '\t'; break;
2936     case '"': Data += '"'; break;
2937     case '\\': Data += '\\'; break;
2938     }
2939   }
2940
2941   Lex();
2942   return false;
2943 }
2944
2945 /// parseDirectiveAscii:
2946 ///   ::= ( .ascii | .asciz | .string ) [ "string" ( , "string" )* ]
2947 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
2948   auto parseOp = [&]() -> bool {
2949     std::string Data;
2950     if (checkForValidSection() || parseEscapedString(Data))
2951       return true;
2952     getStreamer().EmitBytes(Data);
2953     if (ZeroTerminated)
2954       getStreamer().EmitBytes(StringRef("\0", 1));
2955     return false;
2956   };
2957
2958   if (parseMany(parseOp))
2959     return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
2960   return false;
2961 }
2962
2963 /// parseDirectiveReloc
2964 ///  ::= .reloc expression , identifier [ , expression ]
2965 bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) {
2966   const MCExpr *Offset;
2967   const MCExpr *Expr = nullptr;
2968   int64_t OffsetValue;
2969   SMLoc OffsetLoc = Lexer.getTok().getLoc();
2970
2971   if (parseExpression(Offset))
2972     return true;
2973
2974   if ((Offset->evaluateAsAbsolute(OffsetValue,
2975                                   getStreamer().getAssemblerPtr()) &&
2976        check(OffsetValue < 0, OffsetLoc, "expression is negative")) ||
2977       (check(Offset->getKind() != llvm::MCExpr::Constant &&
2978              Offset->getKind() != llvm::MCExpr::SymbolRef,
2979              OffsetLoc, "expected non-negative number or a label")) ||
2980       (parseToken(AsmToken::Comma, "expected comma") ||
2981        check(getTok().isNot(AsmToken::Identifier), "expected relocation name")))
2982     return true;
2983
2984   SMLoc NameLoc = Lexer.getTok().getLoc();
2985   StringRef Name = Lexer.getTok().getIdentifier();
2986   Lex();
2987
2988   if (Lexer.is(AsmToken::Comma)) {
2989     Lex();
2990     SMLoc ExprLoc = Lexer.getLoc();
2991     if (parseExpression(Expr))
2992       return true;
2993
2994     MCValue Value;
2995     if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr))
2996       return Error(ExprLoc, "expression must be relocatable");
2997   }
2998
2999   if (parseToken(AsmToken::EndOfStatement,
3000                  "unexpected token in .reloc directive"))
3001       return true;
3002
3003   const MCTargetAsmParser &MCT = getTargetParser();
3004   const MCSubtargetInfo &STI = MCT.getSTI();
3005   if (getStreamer().EmitRelocDirective(*Offset, Name, Expr, DirectiveLoc, STI))
3006     return Error(NameLoc, "unknown relocation name");
3007
3008   return false;
3009 }
3010
3011 /// parseDirectiveValue
3012 ///  ::= (.byte | .short | ... ) [ expression (, expression)* ]
3013 bool AsmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) {
3014   auto parseOp = [&]() -> bool {
3015     const MCExpr *Value;
3016     SMLoc ExprLoc = getLexer().getLoc();
3017     if (checkForValidSection() || parseExpression(Value))
3018       return true;
3019     // Special case constant expressions to match code generator.
3020     if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3021       assert(Size <= 8 && "Invalid size");
3022       uint64_t IntValue = MCE->getValue();
3023       if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
3024         return Error(ExprLoc, "out of range literal value");
3025       getStreamer().EmitIntValue(IntValue, Size);
3026     } else
3027       getStreamer().EmitValue(Value, Size, ExprLoc);
3028     return false;
3029   };
3030
3031   if (parseMany(parseOp))
3032     return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
3033   return false;
3034 }
3035
3036 static bool parseHexOcta(AsmParser &Asm, uint64_t &hi, uint64_t &lo) {
3037   if (Asm.getTok().isNot(AsmToken::Integer) &&
3038       Asm.getTok().isNot(AsmToken::BigNum))
3039     return Asm.TokError("unknown token in expression");
3040   SMLoc ExprLoc = Asm.getTok().getLoc();
3041   APInt IntValue = Asm.getTok().getAPIntVal();
3042   Asm.Lex();
3043   if (!IntValue.isIntN(128))
3044     return Asm.Error(ExprLoc, "out of range literal value");
3045   if (!IntValue.isIntN(64)) {
3046     hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue();
3047     lo = IntValue.getLoBits(64).getZExtValue();
3048   } else {
3049     hi = 0;
3050     lo = IntValue.getZExtValue();
3051   }
3052   return false;
3053 }
3054
3055 /// ParseDirectiveOctaValue
3056 ///  ::= .octa [ hexconstant (, hexconstant)* ]
3057
3058 bool AsmParser::parseDirectiveOctaValue(StringRef IDVal) {
3059   auto parseOp = [&]() -> bool {
3060     if (checkForValidSection())
3061       return true;
3062     uint64_t hi, lo;
3063     if (parseHexOcta(*this, hi, lo))
3064       return true;
3065     if (MAI.isLittleEndian()) {
3066       getStreamer().EmitIntValue(lo, 8);
3067       getStreamer().EmitIntValue(hi, 8);
3068     } else {
3069       getStreamer().EmitIntValue(hi, 8);
3070       getStreamer().EmitIntValue(lo, 8);
3071     }
3072     return false;
3073   };
3074
3075   if (parseMany(parseOp))
3076     return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
3077   return false;
3078 }
3079
3080 bool AsmParser::parseRealValue(const fltSemantics &Semantics, APInt &Res) {
3081   // We don't truly support arithmetic on floating point expressions, so we
3082   // have to manually parse unary prefixes.
3083   bool IsNeg = false;
3084   if (getLexer().is(AsmToken::Minus)) {
3085     Lexer.Lex();
3086     IsNeg = true;
3087   } else if (getLexer().is(AsmToken::Plus))
3088     Lexer.Lex();
3089
3090   if (Lexer.is(AsmToken::Error))
3091     return TokError(Lexer.getErr());
3092   if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) &&
3093       Lexer.isNot(AsmToken::Identifier))
3094     return TokError("unexpected token in directive");
3095
3096   // Convert to an APFloat.
3097   APFloat Value(Semantics);
3098   StringRef IDVal = getTok().getString();
3099   if (getLexer().is(AsmToken::Identifier)) {
3100     if (!IDVal.compare_lower("infinity") || !IDVal.compare_lower("inf"))
3101       Value = APFloat::getInf(Semantics);
3102     else if (!IDVal.compare_lower("nan"))
3103       Value = APFloat::getNaN(Semantics, false, ~0);
3104     else
3105       return TokError("invalid floating point literal");
3106   } else if (Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven) ==
3107              APFloat::opInvalidOp)
3108     return TokError("invalid floating point literal");
3109   if (IsNeg)
3110     Value.changeSign();
3111
3112   // Consume the numeric token.
3113   Lex();
3114
3115   Res = Value.bitcastToAPInt();
3116
3117   return false;
3118 }
3119
3120 /// parseDirectiveRealValue
3121 ///  ::= (.single | .double) [ expression (, expression)* ]
3122 bool AsmParser::parseDirectiveRealValue(StringRef IDVal,
3123                                         const fltSemantics &Semantics) {
3124   auto parseOp = [&]() -> bool {
3125     APInt AsInt;
3126     if (checkForValidSection() || parseRealValue(Semantics, AsInt))
3127       return true;
3128     getStreamer().EmitIntValue(AsInt.getLimitedValue(),
3129                                AsInt.getBitWidth() / 8);
3130     return false;
3131   };
3132
3133   if (parseMany(parseOp))
3134     return addErrorSuffix(" in '" + Twine(IDVal) + "' directive");
3135   return false;
3136 }
3137
3138 /// parseDirectiveZero
3139 ///  ::= .zero expression
3140 bool AsmParser::parseDirectiveZero() {
3141   SMLoc NumBytesLoc = Lexer.getLoc();
3142   const MCExpr *NumBytes;
3143   if (checkForValidSection() || parseExpression(NumBytes))
3144     return true;
3145
3146   int64_t Val = 0;
3147   if (getLexer().is(AsmToken::Comma)) {
3148     Lex();
3149     if (parseAbsoluteExpression(Val))
3150       return true;
3151   }
3152
3153   if (parseToken(AsmToken::EndOfStatement,
3154                  "unexpected token in '.zero' directive"))
3155     return true;
3156   getStreamer().emitFill(*NumBytes, Val, NumBytesLoc);
3157
3158   return false;
3159 }
3160
3161 /// parseDirectiveFill
3162 ///  ::= .fill expression [ , expression [ , expression ] ]
3163 bool AsmParser::parseDirectiveFill() {
3164   SMLoc NumValuesLoc = Lexer.getLoc();
3165   const MCExpr *NumValues;
3166   if (checkForValidSection() || parseExpression(NumValues))
3167     return true;
3168
3169   int64_t FillSize = 1;
3170   int64_t FillExpr = 0;
3171
3172   SMLoc SizeLoc, ExprLoc;
3173
3174   if (parseOptionalToken(AsmToken::Comma)) {
3175     SizeLoc = getTok().getLoc();
3176     if (parseAbsoluteExpression(FillSize))
3177       return true;
3178     if (parseOptionalToken(AsmToken::Comma)) {
3179       ExprLoc = getTok().getLoc();
3180       if (parseAbsoluteExpression(FillExpr))
3181         return true;
3182     }
3183   }
3184   if (parseToken(AsmToken::EndOfStatement,
3185                  "unexpected token in '.fill' directive"))
3186     return true;
3187
3188   if (FillSize < 0) {
3189     Warning(SizeLoc, "'.fill' directive with negative size has no effect");
3190     return false;
3191   }
3192   if (FillSize > 8) {
3193     Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");
3194     FillSize = 8;
3195   }
3196
3197   if (!isUInt<32>(FillExpr) && FillSize > 4)
3198     Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits");
3199
3200   getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc);
3201
3202   return false;
3203 }
3204
3205 /// parseDirectiveOrg
3206 ///  ::= .org expression [ , expression ]
3207 bool AsmParser::parseDirectiveOrg() {
3208   const MCExpr *Offset;
3209   SMLoc OffsetLoc = Lexer.getLoc();
3210   if (checkForValidSection() || parseExpression(Offset))
3211     return true;
3212
3213   // Parse optional fill expression.
3214   int64_t FillExpr = 0;
3215   if (parseOptionalToken(AsmToken::Comma))
3216     if (parseAbsoluteExpression(FillExpr))
3217       return addErrorSuffix(" in '.org' directive");
3218   if (parseToken(AsmToken::EndOfStatement))
3219     return addErrorSuffix(" in '.org' directive");
3220
3221   getStreamer().emitValueToOffset(Offset, FillExpr, OffsetLoc);
3222   return false;
3223 }
3224
3225 /// parseDirectiveAlign
3226 ///  ::= {.align, ...} expression [ , expression [ , expression ]]
3227 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
3228   SMLoc AlignmentLoc = getLexer().getLoc();
3229   int64_t Alignment;
3230   SMLoc MaxBytesLoc;
3231   bool HasFillExpr = false;
3232   int64_t FillExpr = 0;
3233   int64_t MaxBytesToFill = 0;
3234
3235   auto parseAlign = [&]() -> bool {
3236     if (parseAbsoluteExpression(Alignment))
3237       return true;
3238     if (parseOptionalToken(AsmToken::Comma)) {
3239       // The fill expression can be omitted while specifying a maximum number of
3240       // alignment bytes, e.g:
3241       //  .align 3,,4
3242       if (getTok().isNot(AsmToken::Comma)) {
3243         HasFillExpr = true;
3244         if (parseAbsoluteExpression(FillExpr))
3245           return true;
3246       }
3247       if (parseOptionalToken(AsmToken::Comma))
3248         if (parseTokenLoc(MaxBytesLoc) ||
3249             parseAbsoluteExpression(MaxBytesToFill))
3250           return true;
3251     }
3252     return parseToken(AsmToken::EndOfStatement);
3253   };
3254
3255   if (checkForValidSection())
3256     return addErrorSuffix(" in directive");
3257   // Ignore empty '.p2align' directives for GNU-as compatibility
3258   if (IsPow2 && (ValueSize == 1) && getTok().is(AsmToken::EndOfStatement)) {
3259     Warning(AlignmentLoc, "p2align directive with no operand(s) is ignored");
3260     return parseToken(AsmToken::EndOfStatement);
3261   }
3262   if (parseAlign())
3263     return addErrorSuffix(" in directive");
3264
3265   // Always emit an alignment here even if we thrown an error.
3266   bool ReturnVal = false;
3267
3268   // Compute alignment in bytes.
3269   if (IsPow2) {
3270     // FIXME: Diagnose overflow.
3271     if (Alignment >= 32) {
3272       ReturnVal |= Error(AlignmentLoc, "invalid alignment value");
3273       Alignment = 31;
3274     }
3275
3276     Alignment = 1ULL << Alignment;
3277   } else {
3278     // Reject alignments that aren't either a power of two or zero,
3279     // for gas compatibility. Alignment of zero is silently rounded
3280     // up to one.
3281     if (Alignment == 0)
3282       Alignment = 1;
3283     if (!isPowerOf2_64(Alignment))
3284       ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2");
3285   }
3286
3287   // Diagnose non-sensical max bytes to align.
3288   if (MaxBytesLoc.isValid()) {
3289     if (MaxBytesToFill < 1) {
3290       ReturnVal |= Error(MaxBytesLoc,
3291                          "alignment directive can never be satisfied in this "
3292                          "many bytes, ignoring maximum bytes expression");
3293       MaxBytesToFill = 0;
3294     }
3295
3296     if (MaxBytesToFill >= Alignment) {
3297       Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
3298                            "has no effect");
3299       MaxBytesToFill = 0;
3300     }
3301   }
3302
3303   // Check whether we should use optimal code alignment for this .align
3304   // directive.
3305   const MCSection *Section = getStreamer().getCurrentSectionOnly();
3306   assert(Section && "must have section to emit alignment");
3307   bool UseCodeAlign = Section->UseCodeAlign();
3308   if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
3309       ValueSize == 1 && UseCodeAlign) {
3310     getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);
3311   } else {
3312     // FIXME: Target specific behavior about how the "extra" bytes are filled.
3313     getStreamer().EmitValueToAlignment(Alignment, FillExpr, ValueSize,
3314                                        MaxBytesToFill);
3315   }
3316
3317   return ReturnVal;
3318 }
3319
3320 /// parseDirectiveFile
3321 /// ::= .file filename
3322 /// ::= .file number [directory] filename [md5 checksum] [source source-text]
3323 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
3324   // FIXME: I'm not sure what this is.
3325   int64_t FileNumber = -1;
3326   if (getLexer().is(AsmToken::Integer)) {
3327     FileNumber = getTok().getIntVal();
3328     Lex();
3329
3330     if (FileNumber < 0)
3331       return TokError("negative file number");
3332   }
3333
3334   std::string Path;
3335
3336   // Usually the directory and filename together, otherwise just the directory.
3337   // Allow the strings to have escaped octal character sequence.
3338   if (check(getTok().isNot(AsmToken::String),
3339             "unexpected token in '.file' directive") ||
3340       parseEscapedString(Path))
3341     return true;
3342
3343   StringRef Directory;
3344   StringRef Filename;
3345   std::string FilenameData;
3346   if (getLexer().is(AsmToken::String)) {
3347     if (check(FileNumber == -1,
3348               "explicit path specified, but no file number") ||
3349         parseEscapedString(FilenameData))
3350       return true;
3351     Filename = FilenameData;
3352     Directory = Path;
3353   } else {
3354     Filename = Path;
3355   }
3356
3357   uint64_t MD5Hi, MD5Lo;
3358   bool HasMD5 = false;
3359
3360   Optional<StringRef> Source;
3361   bool HasSource = false;
3362   std::string SourceString;
3363
3364   while (!parseOptionalToken(AsmToken::EndOfStatement)) {
3365     StringRef Keyword;
3366     if (check(getTok().isNot(AsmToken::Identifier),
3367               "unexpected token in '.file' directive") ||
3368         parseIdentifier(Keyword))
3369       return true;
3370     if (Keyword == "md5") {
3371       HasMD5 = true;
3372       if (check(FileNumber == -1,
3373                 "MD5 checksum specified, but no file number") ||
3374           parseHexOcta(*this, MD5Hi, MD5Lo))
3375         return true;
3376     } else if (Keyword == "source") {
3377       HasSource = true;
3378       if (check(FileNumber == -1,
3379                 "source specified, but no file number") ||
3380           check(getTok().isNot(AsmToken::String),
3381                 "unexpected token in '.file' directive") ||
3382           parseEscapedString(SourceString))
3383         return true;
3384     } else {
3385       return TokError("unexpected token in '.file' directive");
3386     }
3387   }
3388
3389   if (FileNumber == -1) {
3390     // Ignore the directive if there is no number and the target doesn't support
3391     // numberless .file directives. This allows some portability of assembler
3392     // between different object file formats.
3393     if (getContext().getAsmInfo()->hasSingleParameterDotFile())
3394       getStreamer().EmitFileDirective(Filename);
3395   } else {
3396     // In case there is a -g option as well as debug info from directive .file,
3397     // we turn off the -g option, directly use the existing debug info instead.
3398     // Throw away any implicit file table for the assembler source.
3399     if (Ctx.getGenDwarfForAssembly()) {
3400       Ctx.getMCDwarfLineTable(0).resetFileTable();
3401       Ctx.setGenDwarfForAssembly(false);
3402     }
3403
3404     Optional<MD5::MD5Result> CKMem;
3405     if (HasMD5) {
3406       MD5::MD5Result Sum;
3407       for (unsigned i = 0; i != 8; ++i) {
3408         Sum.Bytes[i] = uint8_t(MD5Hi >> ((7 - i) * 8));
3409         Sum.Bytes[i + 8] = uint8_t(MD5Lo >> ((7 - i) * 8));
3410       }
3411       CKMem = Sum;
3412     }
3413     if (HasSource) {
3414       char *SourceBuf = static_cast<char *>(Ctx.allocate(SourceString.size()));
3415       memcpy(SourceBuf, SourceString.data(), SourceString.size());
3416       Source = StringRef(SourceBuf, SourceString.size());
3417     }
3418     if (FileNumber == 0) {
3419       if (Ctx.getDwarfVersion() < 5)
3420         return Warning(DirectiveLoc, "file 0 not supported prior to DWARF-5");
3421       getStreamer().emitDwarfFile0Directive(Directory, Filename, CKMem, Source);
3422     } else {
3423       Expected<unsigned> FileNumOrErr = getStreamer().tryEmitDwarfFileDirective(
3424           FileNumber, Directory, Filename, CKMem, Source);
3425       if (!FileNumOrErr)
3426         return Error(DirectiveLoc, toString(FileNumOrErr.takeError()));
3427     }
3428     // Alert the user if there are some .file directives with MD5 and some not.
3429     // But only do that once.
3430     if (!ReportedInconsistentMD5 && !Ctx.isDwarfMD5UsageConsistent(0)) {
3431       ReportedInconsistentMD5 = true;
3432       return Warning(DirectiveLoc, "inconsistent use of MD5 checksums");
3433     }
3434   }
3435
3436   return false;
3437 }
3438
3439 /// parseDirectiveLine
3440 /// ::= .line [number]
3441 bool AsmParser::parseDirectiveLine() {
3442   int64_t LineNumber;
3443   if (getLexer().is(AsmToken::Integer)) {
3444     if (parseIntToken(LineNumber, "unexpected token in '.line' directive"))
3445       return true;
3446     (void)LineNumber;
3447     // FIXME: Do something with the .line.
3448   }
3449   if (parseToken(AsmToken::EndOfStatement,
3450                  "unexpected token in '.line' directive"))
3451     return true;
3452
3453   return false;
3454 }
3455
3456 /// parseDirectiveLoc
3457 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
3458 ///                                [epilogue_begin] [is_stmt VALUE] [isa VALUE]
3459 /// The first number is a file number, must have been previously assigned with
3460 /// a .file directive, the second number is the line number and optionally the
3461 /// third number is a column position (zero if not specified).  The remaining
3462 /// optional items are .loc sub-directives.
3463 bool AsmParser::parseDirectiveLoc() {
3464   int64_t FileNumber = 0, LineNumber = 0;
3465   SMLoc Loc = getTok().getLoc();
3466   if (parseIntToken(FileNumber, "unexpected token in '.loc' directive") ||
3467       check(FileNumber < 1 && Ctx.getDwarfVersion() < 5, Loc,
3468             "file number less than one in '.loc' directive") ||
3469       check(!getContext().isValidDwarfFileNumber(FileNumber), Loc,
3470             "unassigned file number in '.loc' directive"))
3471     return true;
3472
3473   // optional
3474   if (getLexer().is(AsmToken::Integer)) {
3475     LineNumber = getTok().getIntVal();
3476     if (LineNumber < 0)
3477       return TokError("line number less than zero in '.loc' directive");
3478     Lex();
3479   }
3480
3481   int64_t ColumnPos = 0;
3482   if (getLexer().is(AsmToken::Integer)) {
3483     ColumnPos = getTok().getIntVal();
3484     if (ColumnPos < 0)
3485       return TokError("column position less than zero in '.loc' directive");
3486     Lex();
3487   }
3488
3489   unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
3490   unsigned Isa = 0;
3491   int64_t Discriminator = 0;
3492
3493   auto parseLocOp = [&]() -> bool {
3494     StringRef Name;
3495     SMLoc Loc = getTok().getLoc();
3496     if (parseIdentifier(Name))
3497       return TokError("unexpected token in '.loc' directive");
3498
3499     if (Name == "basic_block")
3500       Flags |= DWARF2_FLAG_BASIC_BLOCK;
3501     else if (Name == "prologue_end")
3502       Flags |= DWARF2_FLAG_PROLOGUE_END;
3503     else if (Name == "epilogue_begin")
3504       Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
3505     else if (Name == "is_stmt") {
3506       Loc = getTok().getLoc();
3507       const MCExpr *Value;
3508       if (parseExpression(Value))
3509         return true;
3510       // The expression must be the constant 0 or 1.
3511       if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3512         int Value = MCE->getValue();
3513         if (Value == 0)
3514           Flags &= ~DWARF2_FLAG_IS_STMT;
3515         else if (Value == 1)
3516           Flags |= DWARF2_FLAG_IS_STMT;
3517         else
3518           return Error(Loc, "is_stmt value not 0 or 1");
3519       } else {
3520         return Error(Loc, "is_stmt value not the constant value of 0 or 1");
3521       }
3522     } else if (Name == "isa") {
3523       Loc = getTok().getLoc();
3524       const MCExpr *Value;
3525       if (parseExpression(Value))
3526         return true;
3527       // The expression must be a constant greater or equal to 0.
3528       if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3529         int Value = MCE->getValue();
3530         if (Value < 0)
3531           return Error(Loc, "isa number less than zero");
3532         Isa = Value;
3533       } else {
3534         return Error(Loc, "isa number not a constant value");
3535       }
3536     } else if (Name == "discriminator") {
3537       if (parseAbsoluteExpression(Discriminator))
3538         return true;
3539     } else {
3540       return Error(Loc, "unknown sub-directive in '.loc' directive");
3541     }
3542     return false;
3543   };
3544
3545   if (parseMany(parseLocOp, false /*hasComma*/))
3546     return true;
3547
3548   getStreamer().EmitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
3549                                       Isa, Discriminator, StringRef());
3550
3551   return false;
3552 }
3553
3554 /// parseDirectiveStabs
3555 /// ::= .stabs string, number, number, number
3556 bool AsmParser::parseDirectiveStabs() {
3557   return TokError("unsupported directive '.stabs'");
3558 }
3559
3560 /// parseDirectiveCVFile
3561 /// ::= .cv_file number filename [checksum] [checksumkind]
3562 bool AsmParser::parseDirectiveCVFile() {
3563   SMLoc FileNumberLoc = getTok().getLoc();
3564   int64_t FileNumber;
3565   std::string Filename;
3566   std::string Checksum;
3567   int64_t ChecksumKind = 0;
3568
3569   if (parseIntToken(FileNumber,
3570                     "expected file number in '.cv_file' directive") ||
3571       check(FileNumber < 1, FileNumberLoc, "file number less than one") ||
3572       check(getTok().isNot(AsmToken::String),
3573             "unexpected token in '.cv_file' directive") ||
3574       parseEscapedString(Filename))
3575     return true;
3576   if (!parseOptionalToken(AsmToken::EndOfStatement)) {
3577     if (check(getTok().isNot(AsmToken::String),
3578               "unexpected token in '.cv_file' directive") ||
3579         parseEscapedString(Checksum) ||
3580         parseIntToken(ChecksumKind,
3581                       "expected checksum kind in '.cv_file' directive") ||
3582         parseToken(AsmToken::EndOfStatement,
3583                    "unexpected token in '.cv_file' directive"))
3584       return true;
3585   }
3586
3587   Checksum = fromHex(Checksum);
3588   void *CKMem = Ctx.allocate(Checksum.size(), 1);
3589   memcpy(CKMem, Checksum.data(), Checksum.size());
3590   ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem),
3591                                     Checksum.size());
3592
3593   if (!getStreamer().EmitCVFileDirective(FileNumber, Filename, ChecksumAsBytes,
3594                                          static_cast<uint8_t>(ChecksumKind)))
3595     return Error(FileNumberLoc, "file number already allocated");
3596
3597   return false;
3598 }
3599
3600 bool AsmParser::parseCVFunctionId(int64_t &FunctionId,
3601                                   StringRef DirectiveName) {
3602   SMLoc Loc;
3603   return parseTokenLoc(Loc) ||
3604          parseIntToken(FunctionId, "expected function id in '" + DirectiveName +
3605                                        "' directive") ||
3606          check(FunctionId < 0 || FunctionId >= UINT_MAX, Loc,
3607                "expected function id within range [0, UINT_MAX)");
3608 }
3609
3610 bool AsmParser::parseCVFileId(int64_t &FileNumber, StringRef DirectiveName) {
3611   SMLoc Loc;
3612   return parseTokenLoc(Loc) ||
3613          parseIntToken(FileNumber, "expected integer in '" + DirectiveName +
3614                                        "' directive") ||
3615          check(FileNumber < 1, Loc, "file number less than one in '" +
3616                                         DirectiveName + "' directive") ||
3617          check(!getCVContext().isValidFileNumber(FileNumber), Loc,
3618                "unassigned file number in '" + DirectiveName + "' directive");
3619 }
3620
3621 /// parseDirectiveCVFuncId
3622 /// ::= .cv_func_id FunctionId
3623 ///
3624 /// Introduces a function ID that can be used with .cv_loc.
3625 bool AsmParser::parseDirectiveCVFuncId() {
3626   SMLoc FunctionIdLoc = getTok().getLoc();
3627   int64_t FunctionId;
3628
3629   if (parseCVFunctionId(FunctionId, ".cv_func_id") ||
3630       parseToken(AsmToken::EndOfStatement,
3631                  "unexpected token in '.cv_func_id' directive"))
3632     return true;
3633
3634   if (!getStreamer().EmitCVFuncIdDirective(FunctionId))
3635     return Error(FunctionIdLoc, "function id already allocated");
3636
3637   return false;
3638 }
3639
3640 /// parseDirectiveCVInlineSiteId
3641 /// ::= .cv_inline_site_id FunctionId
3642 ///         "within" IAFunc
3643 ///         "inlined_at" IAFile IALine [IACol]
3644 ///
3645 /// Introduces a function ID that can be used with .cv_loc. Includes "inlined
3646 /// at" source location information for use in the line table of the caller,
3647 /// whether the caller is a real function or another inlined call site.
3648 bool AsmParser::parseDirectiveCVInlineSiteId() {
3649   SMLoc FunctionIdLoc = getTok().getLoc();
3650   int64_t FunctionId;
3651   int64_t IAFunc;
3652   int64_t IAFile;
3653   int64_t IALine;
3654   int64_t IACol = 0;
3655
3656   // FunctionId
3657   if (parseCVFunctionId(FunctionId, ".cv_inline_site_id"))
3658     return true;
3659
3660   // "within"
3661   if (check((getLexer().isNot(AsmToken::Identifier) ||
3662              getTok().getIdentifier() != "within"),
3663             "expected 'within' identifier in '.cv_inline_site_id' directive"))
3664     return true;
3665   Lex();
3666
3667   // IAFunc
3668   if (parseCVFunctionId(IAFunc, ".cv_inline_site_id"))
3669     return true;
3670
3671   // "inlined_at"
3672   if (check((getLexer().isNot(AsmToken::Identifier) ||
3673              getTok().getIdentifier() != "inlined_at"),
3674             "expected 'inlined_at' identifier in '.cv_inline_site_id' "
3675             "directive") )
3676     return true;
3677   Lex();
3678
3679   // IAFile IALine
3680   if (parseCVFileId(IAFile, ".cv_inline_site_id") ||
3681       parseIntToken(IALine, "expected line number after 'inlined_at'"))
3682     return true;
3683
3684   // [IACol]
3685   if (getLexer().is(AsmToken::Integer)) {
3686     IACol = getTok().getIntVal();
3687     Lex();
3688   }
3689
3690   if (parseToken(AsmToken::EndOfStatement,
3691                  "unexpected token in '.cv_inline_site_id' directive"))
3692     return true;
3693
3694   if (!getStreamer().EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
3695                                                  IALine, IACol, FunctionIdLoc))
3696     return Error(FunctionIdLoc, "function id already allocated");
3697
3698   return false;
3699 }
3700
3701 /// parseDirectiveCVLoc
3702 /// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end]
3703 ///                                [is_stmt VALUE]
3704 /// The first number is a file number, must have been previously assigned with
3705 /// a .file directive, the second number is the line number and optionally the
3706 /// third number is a column position (zero if not specified).  The remaining
3707 /// optional items are .loc sub-directives.
3708 bool AsmParser::parseDirectiveCVLoc() {
3709   SMLoc DirectiveLoc = getTok().getLoc();
3710   int64_t FunctionId, FileNumber;
3711   if (parseCVFunctionId(FunctionId, ".cv_loc") ||
3712       parseCVFileId(FileNumber, ".cv_loc"))
3713     return true;
3714
3715   int64_t LineNumber = 0;
3716   if (getLexer().is(AsmToken::Integer)) {
3717     LineNumber = getTok().getIntVal();
3718     if (LineNumber < 0)
3719       return TokError("line number less than zero in '.cv_loc' directive");
3720     Lex();
3721   }
3722
3723   int64_t ColumnPos = 0;
3724   if (getLexer().is(AsmToken::Integer)) {
3725     ColumnPos = getTok().getIntVal();
3726     if (ColumnPos < 0)
3727       return TokError("column position less than zero in '.cv_loc' directive");
3728     Lex();
3729   }
3730
3731   bool PrologueEnd = false;
3732   uint64_t IsStmt = 0;
3733
3734   auto parseOp = [&]() -> bool {
3735     StringRef Name;
3736     SMLoc Loc = getTok().getLoc();
3737     if (parseIdentifier(Name))
3738       return TokError("unexpected token in '.cv_loc' directive");
3739     if (Name == "prologue_end")
3740       PrologueEnd = true;
3741     else if (Name == "is_stmt") {
3742       Loc = getTok().getLoc();
3743       const MCExpr *Value;
3744       if (parseExpression(Value))
3745         return true;
3746       // The expression must be the constant 0 or 1.
3747       IsStmt = ~0ULL;
3748       if (const auto *MCE = dyn_cast<MCConstantExpr>(Value))
3749         IsStmt = MCE->getValue();
3750
3751       if (IsStmt > 1)
3752         return Error(Loc, "is_stmt value not 0 or 1");
3753     } else {
3754       return Error(Loc, "unknown sub-directive in '.cv_loc' directive");
3755     }
3756     return false;
3757   };
3758
3759   if (parseMany(parseOp, false /*hasComma*/))
3760     return true;
3761
3762   getStreamer().EmitCVLocDirective(FunctionId, FileNumber, LineNumber,
3763                                    ColumnPos, PrologueEnd, IsStmt, StringRef(),
3764                                    DirectiveLoc);
3765   return false;
3766 }
3767
3768 /// parseDirectiveCVLinetable
3769 /// ::= .cv_linetable FunctionId, FnStart, FnEnd
3770 bool AsmParser::parseDirectiveCVLinetable() {
3771   int64_t FunctionId;
3772   StringRef FnStartName, FnEndName;
3773   SMLoc Loc = getTok().getLoc();
3774   if (parseCVFunctionId(FunctionId, ".cv_linetable") ||
3775       parseToken(AsmToken::Comma,
3776                  "unexpected token in '.cv_linetable' directive") ||
3777       parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc,
3778                                   "expected identifier in directive") ||
3779       parseToken(AsmToken::Comma,
3780                  "unexpected token in '.cv_linetable' directive") ||
3781       parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc,
3782                                   "expected identifier in directive"))
3783     return true;
3784
3785   MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
3786   MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
3787
3788   getStreamer().EmitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym);
3789   return false;
3790 }
3791
3792 /// parseDirectiveCVInlineLinetable
3793 /// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd
3794 bool AsmParser::parseDirectiveCVInlineLinetable() {
3795   int64_t PrimaryFunctionId, SourceFileId, SourceLineNum;
3796   StringRef FnStartName, FnEndName;
3797   SMLoc Loc = getTok().getLoc();
3798   if (parseCVFunctionId(PrimaryFunctionId, ".cv_inline_linetable") ||
3799       parseTokenLoc(Loc) ||
3800       parseIntToken(
3801           SourceFileId,
3802           "expected SourceField in '.cv_inline_linetable' directive") ||
3803       check(SourceFileId <= 0, Loc,
3804             "File id less than zero in '.cv_inline_linetable' directive") ||
3805       parseTokenLoc(Loc) ||
3806       parseIntToken(
3807           SourceLineNum,
3808           "expected SourceLineNum in '.cv_inline_linetable' directive") ||
3809       check(SourceLineNum < 0, Loc,
3810             "Line number less than zero in '.cv_inline_linetable' directive") ||
3811       parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc,
3812                                   "expected identifier in directive") ||
3813       parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc,
3814                                   "expected identifier in directive"))
3815     return true;
3816
3817   if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
3818     return true;
3819
3820   MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
3821   MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
3822   getStreamer().EmitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId,
3823                                                SourceLineNum, FnStartSym,
3824                                                FnEndSym);
3825   return false;
3826 }
3827
3828 /// parseDirectiveCVDefRange
3829 /// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes*
3830 bool AsmParser::parseDirectiveCVDefRange() {
3831   SMLoc Loc;
3832   std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges;
3833   while (getLexer().is(AsmToken::Identifier)) {
3834     Loc = getLexer().getLoc();
3835     StringRef GapStartName;
3836     if (parseIdentifier(GapStartName))
3837       return Error(Loc, "expected identifier in directive");
3838     MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName);
3839
3840     Loc = getLexer().getLoc();
3841     StringRef GapEndName;
3842     if (parseIdentifier(GapEndName))
3843       return Error(Loc, "expected identifier in directive");
3844     MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName);
3845
3846     Ranges.push_back({GapStartSym, GapEndSym});
3847   }
3848
3849   std::string FixedSizePortion;
3850   if (parseToken(AsmToken::Comma, "unexpected token in directive") ||
3851       parseEscapedString(FixedSizePortion))
3852     return true;
3853
3854   getStreamer().EmitCVDefRangeDirective(Ranges, FixedSizePortion);
3855   return false;
3856 }
3857
3858 /// parseDirectiveCVString
3859 /// ::= .cv_stringtable "string"
3860 bool AsmParser::parseDirectiveCVString() {
3861   std::string Data;
3862   if (checkForValidSection() || parseEscapedString(Data))
3863     return addErrorSuffix(" in '.cv_string' directive");
3864
3865   // Put the string in the table and emit the offset.
3866   std::pair<StringRef, unsigned> Insertion =
3867       getCVContext().addToStringTable(Data);
3868   getStreamer().EmitIntValue(Insertion.second, 4);
3869   return false;
3870 }
3871
3872 /// parseDirectiveCVStringTable
3873 /// ::= .cv_stringtable
3874 bool AsmParser::parseDirectiveCVStringTable() {
3875   getStreamer().EmitCVStringTableDirective();
3876   return false;
3877 }
3878
3879 /// parseDirectiveCVFileChecksums
3880 /// ::= .cv_filechecksums
3881 bool AsmParser::parseDirectiveCVFileChecksums() {
3882   getStreamer().EmitCVFileChecksumsDirective();
3883   return false;
3884 }
3885
3886 /// parseDirectiveCVFileChecksumOffset
3887 /// ::= .cv_filechecksumoffset fileno
3888 bool AsmParser::parseDirectiveCVFileChecksumOffset() {
3889   int64_t FileNo;
3890   if (parseIntToken(FileNo, "expected identifier in directive"))
3891     return true;
3892   if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
3893     return true;
3894   getStreamer().EmitCVFileChecksumOffsetDirective(FileNo);
3895   return false;
3896 }
3897
3898 /// parseDirectiveCVFPOData
3899 /// ::= .cv_fpo_data procsym
3900 bool AsmParser::parseDirectiveCVFPOData() {
3901   SMLoc DirLoc = getLexer().getLoc();
3902   StringRef ProcName;
3903   if (parseIdentifier(ProcName))
3904     return TokError("expected symbol name");
3905   if (parseEOL("unexpected tokens"))
3906     return addErrorSuffix(" in '.cv_fpo_data' directive");
3907   MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName);
3908   getStreamer().EmitCVFPOData(ProcSym, DirLoc);
3909   return false;
3910 }
3911
3912 /// parseDirectiveCFISections
3913 /// ::= .cfi_sections section [, section]
3914 bool AsmParser::parseDirectiveCFISections() {
3915   StringRef Name;
3916   bool EH = false;
3917   bool Debug = false;
3918
3919   if (parseIdentifier(Name))
3920     return TokError("Expected an identifier");
3921
3922   if (Name == ".eh_frame")
3923     EH = true;
3924   else if (Name == ".debug_frame")
3925     Debug = true;
3926
3927   if (getLexer().is(AsmToken::Comma)) {
3928     Lex();
3929
3930     if (parseIdentifier(Name))
3931       return TokError("Expected an identifier");
3932
3933     if (Name == ".eh_frame")
3934       EH = true;
3935     else if (Name == ".debug_frame")
3936       Debug = true;
3937   }
3938
3939   getStreamer().EmitCFISections(EH, Debug);
3940   return false;
3941 }
3942
3943 /// parseDirectiveCFIStartProc
3944 /// ::= .cfi_startproc [simple]
3945 bool AsmParser::parseDirectiveCFIStartProc() {
3946   StringRef Simple;
3947   if (!parseOptionalToken(AsmToken::EndOfStatement)) {
3948     if (check(parseIdentifier(Simple) || Simple != "simple",
3949               "unexpected token") ||
3950         parseToken(AsmToken::EndOfStatement))
3951       return addErrorSuffix(" in '.cfi_startproc' directive");
3952   }
3953
3954   // TODO(kristina): Deal with a corner case of incorrect diagnostic context
3955   // being produced if this directive is emitted as part of preprocessor macro
3956   // expansion which can *ONLY* happen if Clang's cc1as is the API consumer.
3957   // Tools like llvm-mc on the other hand are not affected by it, and report
3958   // correct context information.
3959   getStreamer().EmitCFIStartProc(!Simple.empty(), Lexer.getLoc());
3960   return false;
3961 }
3962
3963 /// parseDirectiveCFIEndProc
3964 /// ::= .cfi_endproc
3965 bool AsmParser::parseDirectiveCFIEndProc() {
3966   getStreamer().EmitCFIEndProc();
3967   return false;
3968 }
3969
3970 /// parse register name or number.
3971 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
3972                                               SMLoc DirectiveLoc) {
3973   unsigned RegNo;
3974
3975   if (getLexer().isNot(AsmToken::Integer)) {
3976     if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
3977       return true;
3978     Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
3979   } else
3980     return parseAbsoluteExpression(Register);
3981
3982   return false;
3983 }
3984
3985 /// parseDirectiveCFIDefCfa
3986 /// ::= .cfi_def_cfa register,  offset
3987 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
3988   int64_t Register = 0, Offset = 0;
3989   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) ||
3990       parseToken(AsmToken::Comma, "unexpected token in directive") ||
3991       parseAbsoluteExpression(Offset))
3992     return true;
3993
3994   getStreamer().EmitCFIDefCfa(Register, Offset);
3995   return false;
3996 }
3997
3998 /// parseDirectiveCFIDefCfaOffset
3999 /// ::= .cfi_def_cfa_offset offset
4000 bool AsmParser::parseDirectiveCFIDefCfaOffset() {
4001   int64_t Offset = 0;
4002   if (parseAbsoluteExpression(Offset))
4003     return true;
4004
4005   getStreamer().EmitCFIDefCfaOffset(Offset);
4006   return false;
4007 }
4008
4009 /// parseDirectiveCFIRegister
4010 /// ::= .cfi_register register, register
4011 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
4012   int64_t Register1 = 0, Register2 = 0;
4013   if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc) ||
4014       parseToken(AsmToken::Comma, "unexpected token in directive") ||
4015       parseRegisterOrRegisterNumber(Register2, DirectiveLoc))
4016     return true;
4017
4018   getStreamer().EmitCFIRegister(Register1, Register2);
4019   return false;
4020 }
4021
4022 /// parseDirectiveCFIWindowSave
4023 /// ::= .cfi_window_save
4024 bool AsmParser::parseDirectiveCFIWindowSave() {
4025   getStreamer().EmitCFIWindowSave();
4026   return false;
4027 }
4028
4029 /// parseDirectiveCFIAdjustCfaOffset
4030 /// ::= .cfi_adjust_cfa_offset adjustment
4031 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
4032   int64_t Adjustment = 0;
4033   if (parseAbsoluteExpression(Adjustment))
4034     return true;
4035
4036   getStreamer().EmitCFIAdjustCfaOffset(Adjustment);
4037   return false;
4038 }
4039
4040 /// parseDirectiveCFIDefCfaRegister
4041 /// ::= .cfi_def_cfa_register register
4042 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
4043   int64_t Register = 0;
4044   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4045     return true;
4046
4047   getStreamer().EmitCFIDefCfaRegister(Register);
4048   return false;
4049 }
4050
4051 /// parseDirectiveCFIOffset
4052 /// ::= .cfi_offset register, offset
4053 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
4054   int64_t Register = 0;
4055   int64_t Offset = 0;
4056
4057   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) ||
4058       parseToken(AsmToken::Comma, "unexpected token in directive") ||
4059       parseAbsoluteExpression(Offset))
4060     return true;
4061
4062   getStreamer().EmitCFIOffset(Register, Offset);
4063   return false;
4064 }
4065
4066 /// parseDirectiveCFIRelOffset
4067 /// ::= .cfi_rel_offset register, offset
4068 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
4069   int64_t Register = 0, Offset = 0;
4070
4071   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) ||
4072       parseToken(AsmToken::Comma, "unexpected token in directive") ||
4073       parseAbsoluteExpression(Offset))
4074     return true;
4075
4076   getStreamer().EmitCFIRelOffset(Register, Offset);
4077   return false;
4078 }
4079
4080 static bool isValidEncoding(int64_t Encoding) {
4081   if (Encoding & ~0xff)
4082     return false;
4083
4084   if (Encoding == dwarf::DW_EH_PE_omit)
4085     return true;
4086
4087   const unsigned Format = Encoding & 0xf;
4088   if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 &&
4089       Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 &&
4090       Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 &&
4091       Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed)
4092     return false;
4093
4094   const unsigned Application = Encoding & 0x70;
4095   if (Application != dwarf::DW_EH_PE_absptr &&
4096       Application != dwarf::DW_EH_PE_pcrel)
4097     return false;
4098
4099   return true;
4100 }
4101
4102 /// parseDirectiveCFIPersonalityOrLsda
4103 /// IsPersonality true for cfi_personality, false for cfi_lsda
4104 /// ::= .cfi_personality encoding, [symbol_name]
4105 /// ::= .cfi_lsda encoding, [symbol_name]
4106 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
4107   int64_t Encoding = 0;
4108   if (parseAbsoluteExpression(Encoding))
4109     return true;
4110   if (Encoding == dwarf::DW_EH_PE_omit)
4111     return false;
4112
4113   StringRef Name;
4114   if (check(!isValidEncoding(Encoding), "unsupported encoding.") ||
4115       parseToken(AsmToken::Comma, "unexpected token in directive") ||
4116       check(parseIdentifier(Name), "expected identifier in directive"))
4117     return true;
4118
4119   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4120
4121   if (IsPersonality)
4122     getStreamer().EmitCFIPersonality(Sym, Encoding);
4123   else
4124     getStreamer().EmitCFILsda(Sym, Encoding);
4125   return false;
4126 }
4127
4128 /// parseDirectiveCFIRememberState
4129 /// ::= .cfi_remember_state
4130 bool AsmParser::parseDirectiveCFIRememberState() {
4131   getStreamer().EmitCFIRememberState();
4132   return false;
4133 }
4134
4135 /// parseDirectiveCFIRestoreState
4136 /// ::= .cfi_remember_state
4137 bool AsmParser::parseDirectiveCFIRestoreState() {
4138   getStreamer().EmitCFIRestoreState();
4139   return false;
4140 }
4141
4142 /// parseDirectiveCFISameValue
4143 /// ::= .cfi_same_value register
4144 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
4145   int64_t Register = 0;
4146
4147   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4148     return true;
4149
4150   getStreamer().EmitCFISameValue(Register);
4151   return false;
4152 }
4153
4154 /// parseDirectiveCFIRestore
4155 /// ::= .cfi_restore register
4156 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
4157   int64_t Register = 0;
4158   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4159     return true;
4160
4161   getStreamer().EmitCFIRestore(Register);
4162   return false;
4163 }
4164
4165 /// parseDirectiveCFIEscape
4166 /// ::= .cfi_escape expression[,...]
4167 bool AsmParser::parseDirectiveCFIEscape() {
4168   std::string Values;
4169   int64_t CurrValue;
4170   if (parseAbsoluteExpression(CurrValue))
4171     return true;
4172
4173   Values.push_back((uint8_t)CurrValue);
4174
4175   while (getLexer().is(AsmToken::Comma)) {
4176     Lex();
4177
4178     if (parseAbsoluteExpression(CurrValue))
4179       return true;
4180
4181     Values.push_back((uint8_t)CurrValue);
4182   }
4183
4184   getStreamer().EmitCFIEscape(Values);
4185   return false;
4186 }
4187
4188 /// parseDirectiveCFIReturnColumn
4189 /// ::= .cfi_return_column register
4190 bool AsmParser::parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc) {
4191   int64_t Register = 0;
4192   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4193     return true;
4194   getStreamer().EmitCFIReturnColumn(Register);
4195   return false;
4196 }
4197
4198 /// parseDirectiveCFISignalFrame
4199 /// ::= .cfi_signal_frame
4200 bool AsmParser::parseDirectiveCFISignalFrame() {
4201   if (parseToken(AsmToken::EndOfStatement,
4202                  "unexpected token in '.cfi_signal_frame'"))
4203     return true;
4204
4205   getStreamer().EmitCFISignalFrame();
4206   return false;
4207 }
4208
4209 /// parseDirectiveCFIUndefined
4210 /// ::= .cfi_undefined register
4211 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
4212   int64_t Register = 0;
4213
4214   if (parseRegisterOrRegisterNumber(Register, DirectiveLoc))
4215     return true;
4216
4217   getStreamer().EmitCFIUndefined(Register);
4218   return false;
4219 }
4220
4221 /// parseDirectiveAltmacro
4222 /// ::= .altmacro
4223 /// ::= .noaltmacro
4224 bool AsmParser::parseDirectiveAltmacro(StringRef Directive) {
4225   if (getLexer().isNot(AsmToken::EndOfStatement))
4226     return TokError("unexpected token in '" + Directive + "' directive");
4227   AltMacroMode = (Directive == ".altmacro");
4228   return false;
4229 }
4230
4231 /// parseDirectiveMacrosOnOff
4232 /// ::= .macros_on
4233 /// ::= .macros_off
4234 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
4235   if (parseToken(AsmToken::EndOfStatement,
4236                  "unexpected token in '" + Directive + "' directive"))
4237     return true;
4238
4239   setMacrosEnabled(Directive == ".macros_on");
4240   return false;
4241 }
4242
4243 /// parseDirectiveMacro
4244 /// ::= .macro name[,] [parameters]
4245 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
4246   StringRef Name;
4247   if (parseIdentifier(Name))
4248     return TokError("expected identifier in '.macro' directive");
4249
4250   if (getLexer().is(AsmToken::Comma))
4251     Lex();
4252
4253   MCAsmMacroParameters Parameters;
4254   while (getLexer().isNot(AsmToken::EndOfStatement)) {
4255
4256     if (!Parameters.empty() && Parameters.back().Vararg)
4257       return Error(Lexer.getLoc(),
4258                    "Vararg parameter '" + Parameters.back().Name +
4259                    "' should be last one in the list of parameters.");
4260
4261     MCAsmMacroParameter Parameter;
4262     if (parseIdentifier(Parameter.Name))
4263       return TokError("expected identifier in '.macro' directive");
4264
4265     // Emit an error if two (or more) named parameters share the same name
4266     for (const MCAsmMacroParameter& CurrParam : Parameters)
4267       if (CurrParam.Name.equals(Parameter.Name))
4268         return TokError("macro '" + Name + "' has multiple parameters"
4269                         " named '" + Parameter.Name + "'");
4270
4271     if (Lexer.is(AsmToken::Colon)) {
4272       Lex();  // consume ':'
4273
4274       SMLoc QualLoc;
4275       StringRef Qualifier;
4276
4277       QualLoc = Lexer.getLoc();
4278       if (parseIdentifier(Qualifier))
4279         return Error(QualLoc, "missing parameter qualifier for "
4280                      "'" + Parameter.Name + "' in macro '" + Name + "'");
4281
4282       if (Qualifier == "req")
4283         Parameter.Required = true;
4284       else if (Qualifier == "vararg")
4285         Parameter.Vararg = true;
4286       else
4287         return Error(QualLoc, Qualifier + " is not a valid parameter qualifier "
4288                      "for '" + Parameter.Name + "' in macro '" + Name + "'");
4289     }
4290
4291     if (getLexer().is(AsmToken::Equal)) {
4292       Lex();
4293
4294       SMLoc ParamLoc;
4295
4296       ParamLoc = Lexer.getLoc();
4297       if (parseMacroArgument(Parameter.Value, /*Vararg=*/false ))
4298         return true;
4299
4300       if (Parameter.Required)
4301         Warning(ParamLoc, "pointless default value for required parameter "
4302                 "'" + Parameter.Name + "' in macro '" + Name + "'");
4303     }
4304
4305     Parameters.push_back(std::move(Parameter));
4306
4307     if (getLexer().is(AsmToken::Comma))
4308       Lex();
4309   }
4310
4311   // Eat just the end of statement.
4312   Lexer.Lex();
4313
4314   // Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors
4315   AsmToken EndToken, StartToken = getTok();
4316   unsigned MacroDepth = 0;
4317   // Lex the macro definition.
4318   while (true) {
4319     // Ignore Lexing errors in macros.
4320     while (Lexer.is(AsmToken::Error)) {
4321       Lexer.Lex();
4322     }
4323
4324     // Check whether we have reached the end of the file.
4325     if (getLexer().is(AsmToken::Eof))
4326       return Error(DirectiveLoc, "no matching '.endmacro' in definition");
4327
4328     // Otherwise, check whether we have reach the .endmacro.
4329     if (getLexer().is(AsmToken::Identifier)) {
4330       if (getTok().getIdentifier() == ".endm" ||
4331           getTok().getIdentifier() == ".endmacro") {
4332         if (MacroDepth == 0) { // Outermost macro.
4333           EndToken = getTok();
4334           Lexer.Lex();
4335           if (getLexer().isNot(AsmToken::EndOfStatement))
4336             return TokError("unexpected token in '" + EndToken.getIdentifier() +
4337                             "' directive");
4338           break;
4339         } else {
4340           // Otherwise we just found the end of an inner macro.
4341           --MacroDepth;
4342         }
4343       } else if (getTok().getIdentifier() == ".macro") {
4344         // We allow nested macros. Those aren't instantiated until the outermost
4345         // macro is expanded so just ignore them for now.
4346         ++MacroDepth;
4347       }
4348     }
4349
4350     // Otherwise, scan til the end of the statement.
4351     eatToEndOfStatement();
4352   }
4353
4354   if (getContext().lookupMacro(Name)) {
4355     return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
4356   }
4357
4358   const char *BodyStart = StartToken.getLoc().getPointer();
4359   const char *BodyEnd = EndToken.getLoc().getPointer();
4360   StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
4361   checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
4362   MCAsmMacro Macro(Name, Body, std::move(Parameters));
4363   DEBUG_WITH_TYPE("asm-macros", dbgs() << "Defining new macro:\n";
4364                   Macro.dump());
4365   getContext().defineMacro(Name, std::move(Macro));
4366   return false;
4367 }
4368
4369 /// checkForBadMacro
4370 ///
4371 /// With the support added for named parameters there may be code out there that
4372 /// is transitioning from positional parameters.  In versions of gas that did
4373 /// not support named parameters they would be ignored on the macro definition.
4374 /// But to support both styles of parameters this is not possible so if a macro
4375 /// definition has named parameters but does not use them and has what appears
4376 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a
4377 /// warning that the positional parameter found in body which have no effect.
4378 /// Hoping the developer will either remove the named parameters from the macro
4379 /// definition so the positional parameters get used if that was what was
4380 /// intended or change the macro to use the named parameters.  It is possible
4381 /// this warning will trigger when the none of the named parameters are used
4382 /// and the strings like $1 are infact to simply to be passed trough unchanged.
4383 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
4384                                  StringRef Body,
4385                                  ArrayRef<MCAsmMacroParameter> Parameters) {
4386   // If this macro is not defined with named parameters the warning we are
4387   // checking for here doesn't apply.
4388   unsigned NParameters = Parameters.size();
4389   if (NParameters == 0)
4390     return;
4391
4392   bool NamedParametersFound = false;
4393   bool PositionalParametersFound = false;
4394
4395   // Look at the body of the macro for use of both the named parameters and what
4396   // are likely to be positional parameters.  This is what expandMacro() is
4397   // doing when it finds the parameters in the body.
4398   while (!Body.empty()) {
4399     // Scan for the next possible parameter.
4400     std::size_t End = Body.size(), Pos = 0;
4401     for (; Pos != End; ++Pos) {
4402       // Check for a substitution or escape.
4403       // This macro is defined with parameters, look for \foo, \bar, etc.
4404       if (Body[Pos] == '\\' && Pos + 1 != End)
4405         break;
4406
4407       // This macro should have parameters, but look for $0, $1, ..., $n too.
4408       if (Body[Pos] != '$' || Pos + 1 == End)
4409         continue;
4410       char Next = Body[Pos + 1];
4411       if (Next == '$' || Next == 'n' ||
4412           isdigit(static_cast<unsigned char>(Next)))
4413         break;
4414     }
4415
4416     // Check if we reached the end.
4417     if (Pos == End)
4418       break;
4419
4420     if (Body[Pos] == '$') {
4421       switch (Body[Pos + 1]) {
4422       // $$ => $
4423       case '$':
4424         break;
4425
4426       // $n => number of arguments
4427       case 'n':
4428         PositionalParametersFound = true;
4429         break;
4430
4431       // $[0-9] => argument
4432       default: {
4433         PositionalParametersFound = true;
4434         break;
4435       }
4436       }
4437       Pos += 2;
4438     } else {
4439       unsigned I = Pos + 1;
4440       while (isIdentifierChar(Body[I]) && I + 1 != End)
4441         ++I;
4442
4443       const char *Begin = Body.data() + Pos + 1;
4444       StringRef Argument(Begin, I - (Pos + 1));
4445       unsigned Index = 0;
4446       for (; Index < NParameters; ++Index)
4447         if (Parameters[Index].Name == Argument)
4448           break;
4449
4450       if (Index == NParameters) {
4451         if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
4452           Pos += 3;
4453         else {
4454           Pos = I;
4455         }
4456       } else {
4457         NamedParametersFound = true;
4458         Pos += 1 + Argument.size();
4459       }
4460     }
4461     // Update the scan point.
4462     Body = Body.substr(Pos);
4463   }
4464
4465   if (!NamedParametersFound && PositionalParametersFound)
4466     Warning(DirectiveLoc, "macro defined with named parameters which are not "
4467                           "used in macro body, possible positional parameter "
4468                           "found in body which will have no effect");
4469 }
4470
4471 /// parseDirectiveExitMacro
4472 /// ::= .exitm
4473 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) {
4474   if (parseToken(AsmToken::EndOfStatement,
4475                  "unexpected token in '" + Directive + "' directive"))
4476     return true;
4477
4478   if (!isInsideMacroInstantiation())
4479     return TokError("unexpected '" + Directive + "' in file, "
4480                                                  "no current macro definition");
4481
4482   // Exit all conditionals that are active in the current macro.
4483   while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) {
4484     TheCondState = TheCondStack.back();
4485     TheCondStack.pop_back();
4486   }
4487
4488   handleMacroExit();
4489   return false;
4490 }
4491
4492 /// parseDirectiveEndMacro
4493 /// ::= .endm
4494 /// ::= .endmacro
4495 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
4496   if (getLexer().isNot(AsmToken::EndOfStatement))
4497     return TokError("unexpected token in '" + Directive + "' directive");
4498
4499   // If we are inside a macro instantiation, terminate the current
4500   // instantiation.
4501   if (isInsideMacroInstantiation()) {
4502     handleMacroExit();
4503     return false;
4504   }
4505
4506   // Otherwise, this .endmacro is a stray entry in the file; well formed
4507   // .endmacro directives are handled during the macro definition parsing.
4508   return TokError("unexpected '" + Directive + "' in file, "
4509                                                "no current macro definition");
4510 }
4511
4512 /// parseDirectivePurgeMacro
4513 /// ::= .purgem
4514 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
4515   StringRef Name;
4516   SMLoc Loc;
4517   if (parseTokenLoc(Loc) ||
4518       check(parseIdentifier(Name), Loc,
4519             "expected identifier in '.purgem' directive") ||
4520       parseToken(AsmToken::EndOfStatement,
4521                  "unexpected token in '.purgem' directive"))
4522     return true;
4523
4524   if (!getContext().lookupMacro(Name))
4525     return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
4526
4527   getContext().undefineMacro(Name);
4528   DEBUG_WITH_TYPE("asm-macros", dbgs()
4529                                     << "Un-defining macro: " << Name << "\n");
4530   return false;
4531 }
4532
4533 /// parseDirectiveBundleAlignMode
4534 /// ::= {.bundle_align_mode} expression
4535 bool AsmParser::parseDirectiveBundleAlignMode() {
4536   // Expect a single argument: an expression that evaluates to a constant
4537   // in the inclusive range 0-30.
4538   SMLoc ExprLoc = getLexer().getLoc();
4539   int64_t AlignSizePow2;
4540   if (checkForValidSection() || parseAbsoluteExpression(AlignSizePow2) ||
4541       parseToken(AsmToken::EndOfStatement, "unexpected token after expression "
4542                                            "in '.bundle_align_mode' "
4543                                            "directive") ||
4544       check(AlignSizePow2 < 0 || AlignSizePow2 > 30, ExprLoc,
4545             "invalid bundle alignment size (expected between 0 and 30)"))
4546     return true;
4547
4548   // Because of AlignSizePow2's verified range we can safely truncate it to
4549   // unsigned.
4550   getStreamer().EmitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
4551   return false;
4552 }
4553
4554 /// parseDirectiveBundleLock
4555 /// ::= {.bundle_lock} [align_to_end]
4556 bool AsmParser::parseDirectiveBundleLock() {
4557   if (checkForValidSection())
4558     return true;
4559   bool AlignToEnd = false;
4560
4561   StringRef Option;
4562   SMLoc Loc = getTok().getLoc();
4563   const char *kInvalidOptionError =
4564       "invalid option for '.bundle_lock' directive";
4565
4566   if (!parseOptionalToken(AsmToken::EndOfStatement)) {
4567     if (check(parseIdentifier(Option), Loc, kInvalidOptionError) ||
4568         check(Option != "align_to_end", Loc, kInvalidOptionError) ||
4569         parseToken(AsmToken::EndOfStatement,
4570                    "unexpected token after '.bundle_lock' directive option"))
4571       return true;
4572     AlignToEnd = true;
4573   }
4574
4575   getStreamer().EmitBundleLock(AlignToEnd);
4576   return false;
4577 }
4578
4579 /// parseDirectiveBundleLock
4580 /// ::= {.bundle_lock}
4581 bool AsmParser::parseDirectiveBundleUnlock() {
4582   if (checkForValidSection() ||
4583       parseToken(AsmToken::EndOfStatement,
4584                  "unexpected token in '.bundle_unlock' directive"))
4585     return true;
4586
4587   getStreamer().EmitBundleUnlock();
4588   return false;
4589 }
4590
4591 /// parseDirectiveSpace
4592 /// ::= (.skip | .space) expression [ , expression ]
4593 bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
4594   SMLoc NumBytesLoc = Lexer.getLoc();
4595   const MCExpr *NumBytes;
4596   if (checkForValidSection() || parseExpression(NumBytes))
4597     return true;
4598
4599   int64_t FillExpr = 0;
4600   if (parseOptionalToken(AsmToken::Comma))
4601     if (parseAbsoluteExpression(FillExpr))
4602       return addErrorSuffix("in '" + Twine(IDVal) + "' directive");
4603   if (parseToken(AsmToken::EndOfStatement))
4604     return addErrorSuffix("in '" + Twine(IDVal) + "' directive");
4605
4606   // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
4607   getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc);
4608
4609   return false;
4610 }
4611
4612 /// parseDirectiveDCB
4613 /// ::= .dcb.{b, l, w} expression, expression
4614 bool AsmParser::parseDirectiveDCB(StringRef IDVal, unsigned Size) {
4615   SMLoc NumValuesLoc = Lexer.getLoc();
4616   int64_t NumValues;
4617   if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4618     return true;
4619
4620   if (NumValues < 0) {
4621     Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4622     return false;
4623   }
4624
4625   if (parseToken(AsmToken::Comma,
4626                  "unexpected token in '" + Twine(IDVal) + "' directive"))
4627     return true;
4628
4629   const MCExpr *Value;
4630   SMLoc ExprLoc = getLexer().getLoc();
4631   if (parseExpression(Value))
4632     return true;
4633
4634   // Special case constant expressions to match code generator.
4635   if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
4636     assert(Size <= 8 && "Invalid size");
4637     uint64_t IntValue = MCE->getValue();
4638     if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
4639       return Error(ExprLoc, "literal value out of range for directive");
4640     for (uint64_t i = 0, e = NumValues; i != e; ++i)
4641       getStreamer().EmitIntValue(IntValue, Size);
4642   } else {
4643     for (uint64_t i = 0, e = NumValues; i != e; ++i)
4644       getStreamer().EmitValue(Value, Size, ExprLoc);
4645   }
4646
4647   if (parseToken(AsmToken::EndOfStatement,
4648                  "unexpected token in '" + Twine(IDVal) + "' directive"))
4649     return true;
4650
4651   return false;
4652 }
4653
4654 /// parseDirectiveRealDCB
4655 /// ::= .dcb.{d, s} expression, expression
4656 bool AsmParser::parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &Semantics) {
4657   SMLoc NumValuesLoc = Lexer.getLoc();
4658   int64_t NumValues;
4659   if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4660     return true;
4661
4662   if (NumValues < 0) {
4663     Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4664     return false;
4665   }
4666
4667   if (parseToken(AsmToken::Comma,
4668                  "unexpected token in '" + Twine(IDVal) + "' directive"))
4669     return true;
4670
4671   APInt AsInt;
4672   if (parseRealValue(Semantics, AsInt))
4673     return true;
4674
4675   if (parseToken(AsmToken::EndOfStatement,
4676                  "unexpected token in '" + Twine(IDVal) + "' directive"))
4677     return true;
4678
4679   for (uint64_t i = 0, e = NumValues; i != e; ++i)
4680     getStreamer().EmitIntValue(AsInt.getLimitedValue(),
4681                                AsInt.getBitWidth() / 8);
4682
4683   return false;
4684 }
4685
4686 /// parseDirectiveDS
4687 /// ::= .ds.{b, d, l, p, s, w, x} expression
4688 bool AsmParser::parseDirectiveDS(StringRef IDVal, unsigned Size) {
4689   SMLoc NumValuesLoc = Lexer.getLoc();
4690   int64_t NumValues;
4691   if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4692     return true;
4693
4694   if (NumValues < 0) {
4695     Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4696     return false;
4697   }
4698
4699   if (parseToken(AsmToken::EndOfStatement,
4700                  "unexpected token in '" + Twine(IDVal) + "' directive"))
4701     return true;
4702
4703   for (uint64_t i = 0, e = NumValues; i != e; ++i)
4704     getStreamer().emitFill(Size, 0);
4705
4706   return false;
4707 }
4708
4709 /// parseDirectiveLEB128
4710 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ]
4711 bool AsmParser::parseDirectiveLEB128(bool Signed) {
4712   if (checkForValidSection())
4713     return true;
4714
4715   auto parseOp = [&]() -> bool {
4716     const MCExpr *Value;
4717     if (parseExpression(Value))
4718       return true;
4719     if (Signed)
4720       getStreamer().EmitSLEB128Value(Value);
4721     else
4722       getStreamer().EmitULEB128Value(Value);
4723     return false;
4724   };
4725
4726   if (parseMany(parseOp))
4727     return addErrorSuffix(" in directive");
4728
4729   return false;
4730 }
4731
4732 /// parseDirectiveSymbolAttribute
4733 ///  ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
4734 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
4735   auto parseOp = [&]() -> bool {
4736     StringRef Name;
4737     SMLoc Loc = getTok().getLoc();
4738     if (parseIdentifier(Name))
4739       return Error(Loc, "expected identifier");
4740     MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4741
4742     // Assembler local symbols don't make any sense here. Complain loudly.
4743     if (Sym->isTemporary())
4744       return Error(Loc, "non-local symbol required");
4745
4746     if (!getStreamer().EmitSymbolAttribute(Sym, Attr))
4747       return Error(Loc, "unable to emit symbol attribute");
4748     return false;
4749   };
4750
4751   if (parseMany(parseOp))
4752     return addErrorSuffix(" in directive");
4753   return false;
4754 }
4755
4756 /// parseDirectiveComm
4757 ///  ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
4758 bool AsmParser::parseDirectiveComm(bool IsLocal) {
4759   if (checkForValidSection())
4760     return true;
4761
4762   SMLoc IDLoc = getLexer().getLoc();
4763   StringRef Name;
4764   if (parseIdentifier(Name))
4765     return TokError("expected identifier in directive");
4766
4767   // Handle the identifier as the key symbol.
4768   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4769
4770   if (getLexer().isNot(AsmToken::Comma))
4771     return TokError("unexpected token in directive");
4772   Lex();
4773
4774   int64_t Size;
4775   SMLoc SizeLoc = getLexer().getLoc();
4776   if (parseAbsoluteExpression(Size))
4777     return true;
4778
4779   int64_t Pow2Alignment = 0;
4780   SMLoc Pow2AlignmentLoc;
4781   if (getLexer().is(AsmToken::Comma)) {
4782     Lex();
4783     Pow2AlignmentLoc = getLexer().getLoc();
4784     if (parseAbsoluteExpression(Pow2Alignment))
4785       return true;
4786
4787     LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
4788     if (IsLocal && LCOMM == LCOMM::NoAlignment)
4789       return Error(Pow2AlignmentLoc, "alignment not supported on this target");
4790
4791     // If this target takes alignments in bytes (not log) validate and convert.
4792     if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
4793         (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
4794       if (!isPowerOf2_64(Pow2Alignment))
4795         return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
4796       Pow2Alignment = Log2_64(Pow2Alignment);
4797     }
4798   }
4799
4800   if (parseToken(AsmToken::EndOfStatement,
4801                  "unexpected token in '.comm' or '.lcomm' directive"))
4802     return true;
4803
4804   // NOTE: a size of zero for a .comm should create a undefined symbol
4805   // but a size of .lcomm creates a bss symbol of size zero.
4806   if (Size < 0)
4807     return Error(SizeLoc, "invalid '.comm' or '.lcomm' directive size, can't "
4808                           "be less than zero");
4809
4810   // NOTE: The alignment in the directive is a power of 2 value, the assembler
4811   // may internally end up wanting an alignment in bytes.
4812   // FIXME: Diagnose overflow.
4813   if (Pow2Alignment < 0)
4814     return Error(Pow2AlignmentLoc, "invalid '.comm' or '.lcomm' directive "
4815                                    "alignment, can't be less than zero");
4816
4817   Sym->redefineIfPossible();
4818   if (!Sym->isUndefined())
4819     return Error(IDLoc, "invalid symbol redefinition");
4820
4821   // Create the Symbol as a common or local common with Size and Pow2Alignment
4822   if (IsLocal) {
4823     getStreamer().EmitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
4824     return false;
4825   }
4826
4827   getStreamer().EmitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
4828   return false;
4829 }
4830
4831 /// parseDirectiveAbort
4832 ///  ::= .abort [... message ...]
4833 bool AsmParser::parseDirectiveAbort() {
4834   // FIXME: Use loc from directive.
4835   SMLoc Loc = getLexer().getLoc();
4836
4837   StringRef Str = parseStringToEndOfStatement();
4838   if (parseToken(AsmToken::EndOfStatement,
4839                  "unexpected token in '.abort' directive"))
4840     return true;
4841
4842   if (Str.empty())
4843     return Error(Loc, ".abort detected. Assembly stopping.");
4844   else
4845     return Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
4846   // FIXME: Actually abort assembly here.
4847
4848   return false;
4849 }
4850
4851 /// parseDirectiveInclude
4852 ///  ::= .include "filename"
4853 bool AsmParser::parseDirectiveInclude() {
4854   // Allow the strings to have escaped octal character sequence.
4855   std::string Filename;
4856   SMLoc IncludeLoc = getTok().getLoc();
4857
4858   if (check(getTok().isNot(AsmToken::String),
4859             "expected string in '.include' directive") ||
4860       parseEscapedString(Filename) ||
4861       check(getTok().isNot(AsmToken::EndOfStatement),
4862             "unexpected token in '.include' directive") ||
4863       // Attempt to switch the lexer to the included file before consuming the
4864       // end of statement to avoid losing it when we switch.
4865       check(enterIncludeFile(Filename), IncludeLoc,
4866             "Could not find include file '" + Filename + "'"))
4867     return true;
4868
4869   return false;
4870 }
4871
4872 /// parseDirectiveIncbin
4873 ///  ::= .incbin "filename" [ , skip [ , count ] ]
4874 bool AsmParser::parseDirectiveIncbin() {
4875   // Allow the strings to have escaped octal character sequence.
4876   std::string Filename;
4877   SMLoc IncbinLoc = getTok().getLoc();
4878   if (check(getTok().isNot(AsmToken::String),
4879             "expected string in '.incbin' directive") ||
4880       parseEscapedString(Filename))
4881     return true;
4882
4883   int64_t Skip = 0;
4884   const MCExpr *Count = nullptr;
4885   SMLoc SkipLoc, CountLoc;
4886   if (parseOptionalToken(AsmToken::Comma)) {
4887     // The skip expression can be omitted while specifying the count, e.g:
4888     //  .incbin "filename",,4
4889     if (getTok().isNot(AsmToken::Comma)) {
4890       if (parseTokenLoc(SkipLoc) || parseAbsoluteExpression(Skip))
4891         return true;
4892     }
4893     if (parseOptionalToken(AsmToken::Comma)) {
4894       CountLoc = getTok().getLoc();
4895       if (parseExpression(Count))
4896         return true;
4897     }
4898   }
4899
4900   if (parseToken(AsmToken::EndOfStatement,
4901                  "unexpected token in '.incbin' directive"))
4902     return true;
4903
4904   if (check(Skip < 0, SkipLoc, "skip is negative"))
4905     return true;
4906
4907   // Attempt to process the included file.
4908   if (processIncbinFile(Filename, Skip, Count, CountLoc))
4909     return Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
4910   return false;
4911 }
4912
4913 /// parseDirectiveIf
4914 /// ::= .if{,eq,ge,gt,le,lt,ne} expression
4915 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) {
4916   TheCondStack.push_back(TheCondState);
4917   TheCondState.TheCond = AsmCond::IfCond;
4918   if (TheCondState.Ignore) {
4919     eatToEndOfStatement();
4920   } else {
4921     int64_t ExprValue;
4922     if (parseAbsoluteExpression(ExprValue) ||
4923         parseToken(AsmToken::EndOfStatement,
4924                    "unexpected token in '.if' directive"))
4925       return true;
4926
4927     switch (DirKind) {
4928     default:
4929       llvm_unreachable("unsupported directive");
4930     case DK_IF:
4931     case DK_IFNE:
4932       break;
4933     case DK_IFEQ:
4934       ExprValue = ExprValue == 0;
4935       break;
4936     case DK_IFGE:
4937       ExprValue = ExprValue >= 0;
4938       break;
4939     case DK_IFGT:
4940       ExprValue = ExprValue > 0;
4941       break;
4942     case DK_IFLE:
4943       ExprValue = ExprValue <= 0;
4944       break;
4945     case DK_IFLT:
4946       ExprValue = ExprValue < 0;
4947       break;
4948     }
4949
4950     TheCondState.CondMet = ExprValue;
4951     TheCondState.Ignore = !TheCondState.CondMet;
4952   }
4953
4954   return false;
4955 }
4956
4957 /// parseDirectiveIfb
4958 /// ::= .ifb string
4959 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
4960   TheCondStack.push_back(TheCondState);
4961   TheCondState.TheCond = AsmCond::IfCond;
4962
4963   if (TheCondState.Ignore) {
4964     eatToEndOfStatement();
4965   } else {
4966     StringRef Str = parseStringToEndOfStatement();
4967
4968     if (parseToken(AsmToken::EndOfStatement,
4969                    "unexpected token in '.ifb' directive"))
4970       return true;
4971
4972     TheCondState.CondMet = ExpectBlank == Str.empty();
4973     TheCondState.Ignore = !TheCondState.CondMet;
4974   }
4975
4976   return false;
4977 }
4978
4979 /// parseDirectiveIfc
4980 /// ::= .ifc string1, string2
4981 /// ::= .ifnc string1, string2
4982 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
4983   TheCondStack.push_back(TheCondState);
4984   TheCondState.TheCond = AsmCond::IfCond;
4985
4986   if (TheCondState.Ignore) {
4987     eatToEndOfStatement();
4988   } else {
4989     StringRef Str1 = parseStringToComma();
4990
4991     if (parseToken(AsmToken::Comma, "unexpected token in '.ifc' directive"))
4992       return true;
4993
4994     StringRef Str2 = parseStringToEndOfStatement();
4995
4996     if (parseToken(AsmToken::EndOfStatement,
4997                    "unexpected token in '.ifc' directive"))
4998       return true;
4999
5000     TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim());
5001     TheCondState.Ignore = !TheCondState.CondMet;
5002   }
5003
5004   return false;
5005 }
5006
5007 /// parseDirectiveIfeqs
5008 ///   ::= .ifeqs string1, string2
5009 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) {
5010   if (Lexer.isNot(AsmToken::String)) {
5011     if (ExpectEqual)
5012       return TokError("expected string parameter for '.ifeqs' directive");
5013     return TokError("expected string parameter for '.ifnes' directive");
5014   }
5015
5016   StringRef String1 = getTok().getStringContents();
5017   Lex();
5018
5019   if (Lexer.isNot(AsmToken::Comma)) {
5020     if (ExpectEqual)
5021       return TokError(
5022           "expected comma after first string for '.ifeqs' directive");
5023     return TokError("expected comma after first string for '.ifnes' directive");
5024   }
5025
5026   Lex();
5027
5028   if (Lexer.isNot(AsmToken::String)) {
5029     if (ExpectEqual)
5030       return TokError("expected string parameter for '.ifeqs' directive");
5031     return TokError("expected string parameter for '.ifnes' directive");
5032   }
5033
5034   StringRef String2 = getTok().getStringContents();
5035   Lex();
5036
5037   TheCondStack.push_back(TheCondState);
5038   TheCondState.TheCond = AsmCond::IfCond;
5039   TheCondState.CondMet = ExpectEqual == (String1 == String2);
5040   TheCondState.Ignore = !TheCondState.CondMet;
5041
5042   return false;
5043 }
5044
5045 /// parseDirectiveIfdef
5046 /// ::= .ifdef symbol
5047 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
5048   StringRef Name;
5049   TheCondStack.push_back(TheCondState);
5050   TheCondState.TheCond = AsmCond::IfCond;
5051
5052   if (TheCondState.Ignore) {
5053     eatToEndOfStatement();
5054   } else {
5055     if (check(parseIdentifier(Name), "expected identifier after '.ifdef'") ||
5056         parseToken(AsmToken::EndOfStatement, "unexpected token in '.ifdef'"))
5057       return true;
5058
5059     MCSymbol *Sym = getContext().lookupSymbol(Name);
5060
5061     if (expect_defined)
5062       TheCondState.CondMet = (Sym && !Sym->isUndefined(false));
5063     else
5064       TheCondState.CondMet = (!Sym || Sym->isUndefined(false));
5065     TheCondState.Ignore = !TheCondState.CondMet;
5066   }
5067
5068   return false;
5069 }
5070
5071 /// parseDirectiveElseIf
5072 /// ::= .elseif expression
5073 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
5074   if (TheCondState.TheCond != AsmCond::IfCond &&
5075       TheCondState.TheCond != AsmCond::ElseIfCond)
5076     return Error(DirectiveLoc, "Encountered a .elseif that doesn't follow an"
5077                                " .if or  an .elseif");
5078   TheCondState.TheCond = AsmCond::ElseIfCond;
5079
5080   bool LastIgnoreState = false;
5081   if (!TheCondStack.empty())
5082     LastIgnoreState = TheCondStack.back().Ignore;
5083   if (LastIgnoreState || TheCondState.CondMet) {
5084     TheCondState.Ignore = true;
5085     eatToEndOfStatement();
5086   } else {
5087     int64_t ExprValue;
5088     if (parseAbsoluteExpression(ExprValue))
5089       return true;
5090
5091     if (parseToken(AsmToken::EndOfStatement,
5092                    "unexpected token in '.elseif' directive"))
5093       return true;
5094
5095     TheCondState.CondMet = ExprValue;
5096     TheCondState.Ignore = !TheCondState.CondMet;
5097   }
5098
5099   return false;
5100 }
5101
5102 /// parseDirectiveElse
5103 /// ::= .else
5104 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
5105   if (parseToken(AsmToken::EndOfStatement,
5106                  "unexpected token in '.else' directive"))
5107     return true;
5108
5109   if (TheCondState.TheCond != AsmCond::IfCond &&
5110       TheCondState.TheCond != AsmCond::ElseIfCond)
5111     return Error(DirectiveLoc, "Encountered a .else that doesn't follow "
5112                                " an .if or an .elseif");
5113   TheCondState.TheCond = AsmCond::ElseCond;
5114   bool LastIgnoreState = false;
5115   if (!TheCondStack.empty())
5116     LastIgnoreState = TheCondStack.back().Ignore;
5117   if (LastIgnoreState || TheCondState.CondMet)
5118     TheCondState.Ignore = true;
5119   else
5120     TheCondState.Ignore = false;
5121
5122   return false;
5123 }
5124
5125 /// parseDirectiveEnd
5126 /// ::= .end
5127 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) {
5128   if (parseToken(AsmToken::EndOfStatement,
5129                  "unexpected token in '.end' directive"))
5130     return true;
5131
5132   while (Lexer.isNot(AsmToken::Eof))
5133     Lexer.Lex();
5134
5135   return false;
5136 }
5137
5138 /// parseDirectiveError
5139 ///   ::= .err
5140 ///   ::= .error [string]
5141 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) {
5142   if (!TheCondStack.empty()) {
5143     if (TheCondStack.back().Ignore) {
5144       eatToEndOfStatement();
5145       return false;
5146     }
5147   }
5148
5149   if (!WithMessage)
5150     return Error(L, ".err encountered");
5151
5152   StringRef Message = ".error directive invoked in source file";
5153   if (Lexer.isNot(AsmToken::EndOfStatement)) {
5154     if (Lexer.isNot(AsmToken::String))
5155       return TokError(".error argument must be a string");
5156
5157     Message = getTok().getStringContents();
5158     Lex();
5159   }
5160
5161   return Error(L, Message);
5162 }
5163
5164 /// parseDirectiveWarning
5165 ///   ::= .warning [string]
5166 bool AsmParser::parseDirectiveWarning(SMLoc L) {
5167   if (!TheCondStack.empty()) {
5168     if (TheCondStack.back().Ignore) {
5169       eatToEndOfStatement();
5170       return false;
5171     }
5172   }
5173
5174   StringRef Message = ".warning directive invoked in source file";
5175
5176   if (!parseOptionalToken(AsmToken::EndOfStatement)) {
5177     if (Lexer.isNot(AsmToken::String))
5178       return TokError(".warning argument must be a string");
5179
5180     Message = getTok().getStringContents();
5181     Lex();
5182     if (parseToken(AsmToken::EndOfStatement,
5183                    "expected end of statement in '.warning' directive"))
5184       return true;
5185   }
5186
5187   return Warning(L, Message);
5188 }
5189
5190 /// parseDirectiveEndIf
5191 /// ::= .endif
5192 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
5193   if (parseToken(AsmToken::EndOfStatement,
5194                  "unexpected token in '.endif' directive"))
5195     return true;
5196
5197   if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
5198     return Error(DirectiveLoc, "Encountered a .endif that doesn't follow "
5199                                "an .if or .else");
5200   if (!TheCondStack.empty()) {
5201     TheCondState = TheCondStack.back();
5202     TheCondStack.pop_back();
5203   }
5204
5205   return false;
5206 }
5207
5208 void AsmParser::initializeDirectiveKindMap() {
5209   DirectiveKindMap[".set"] = DK_SET;
5210   DirectiveKindMap[".equ"] = DK_EQU;
5211   DirectiveKindMap[".equiv"] = DK_EQUIV;
5212   DirectiveKindMap[".ascii"] = DK_ASCII;
5213   DirectiveKindMap[".asciz"] = DK_ASCIZ;
5214   DirectiveKindMap[".string"] = DK_STRING;
5215   DirectiveKindMap[".byte"] = DK_BYTE;
5216   DirectiveKindMap[".short"] = DK_SHORT;
5217   DirectiveKindMap[".value"] = DK_VALUE;
5218   DirectiveKindMap[".2byte"] = DK_2BYTE;
5219   DirectiveKindMap[".long"] = DK_LONG;
5220   DirectiveKindMap[".int"] = DK_INT;
5221   DirectiveKindMap[".4byte"] = DK_4BYTE;
5222   DirectiveKindMap[".quad"] = DK_QUAD;
5223   DirectiveKindMap[".8byte"] = DK_8BYTE;
5224   DirectiveKindMap[".octa"] = DK_OCTA;
5225   DirectiveKindMap[".single"] = DK_SINGLE;
5226   DirectiveKindMap[".float"] = DK_FLOAT;
5227   DirectiveKindMap[".double"] = DK_DOUBLE;
5228   DirectiveKindMap[".align"] = DK_ALIGN;
5229   DirectiveKindMap[".align32"] = DK_ALIGN32;
5230   DirectiveKindMap[".balign"] = DK_BALIGN;
5231   DirectiveKindMap[".balignw"] = DK_BALIGNW;
5232   DirectiveKindMap[".balignl"] = DK_BALIGNL;
5233   DirectiveKindMap[".p2align"] = DK_P2ALIGN;
5234   DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
5235   DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
5236   DirectiveKindMap[".org"] = DK_ORG;
5237   DirectiveKindMap[".fill"] = DK_FILL;
5238   DirectiveKindMap[".zero"] = DK_ZERO;
5239   DirectiveKindMap[".extern"] = DK_EXTERN;
5240   DirectiveKindMap[".globl"] = DK_GLOBL;
5241   DirectiveKindMap[".global"] = DK_GLOBAL;
5242   DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
5243   DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
5244   DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
5245   DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
5246   DirectiveKindMap[".reference"] = DK_REFERENCE;
5247   DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
5248   DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
5249   DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
5250   DirectiveKindMap[".cold"] = DK_COLD;
5251   DirectiveKindMap[".comm"] = DK_COMM;
5252   DirectiveKindMap[".common"] = DK_COMMON;
5253   DirectiveKindMap[".lcomm"] = DK_LCOMM;
5254   DirectiveKindMap[".abort"] = DK_ABORT;
5255   DirectiveKindMap[".include"] = DK_INCLUDE;
5256   DirectiveKindMap[".incbin"] = DK_INCBIN;
5257   DirectiveKindMap[".code16"] = DK_CODE16;
5258   DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
5259   DirectiveKindMap[".rept"] = DK_REPT;
5260   DirectiveKindMap[".rep"] = DK_REPT;
5261   DirectiveKindMap[".irp"] = DK_IRP;
5262   DirectiveKindMap[".irpc"] = DK_IRPC;
5263   DirectiveKindMap[".endr"] = DK_ENDR;
5264   DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
5265   DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
5266   DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
5267   DirectiveKindMap[".if"] = DK_IF;
5268   DirectiveKindMap[".ifeq"] = DK_IFEQ;
5269   DirectiveKindMap[".ifge"] = DK_IFGE;
5270   DirectiveKindMap[".ifgt"] = DK_IFGT;
5271   DirectiveKindMap[".ifle"] = DK_IFLE;
5272   DirectiveKindMap[".iflt"] = DK_IFLT;
5273   DirectiveKindMap[".ifne"] = DK_IFNE;
5274   DirectiveKindMap[".ifb"] = DK_IFB;
5275   DirectiveKindMap[".ifnb"] = DK_IFNB;
5276   DirectiveKindMap[".ifc"] = DK_IFC;
5277   DirectiveKindMap[".ifeqs"] = DK_IFEQS;
5278   DirectiveKindMap[".ifnc"] = DK_IFNC;
5279   DirectiveKindMap[".ifnes"] = DK_IFNES;
5280   DirectiveKindMap[".ifdef"] = DK_IFDEF;
5281   DirectiveKindMap[".ifndef"] = DK_IFNDEF;
5282   DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
5283   DirectiveKindMap[".elseif"] = DK_ELSEIF;
5284   DirectiveKindMap[".else"] = DK_ELSE;
5285   DirectiveKindMap[".end"] = DK_END;
5286   DirectiveKindMap[".endif"] = DK_ENDIF;
5287   DirectiveKindMap[".skip"] = DK_SKIP;
5288   DirectiveKindMap[".space"] = DK_SPACE;
5289   DirectiveKindMap[".file"] = DK_FILE;
5290   DirectiveKindMap[".line"] = DK_LINE;
5291   DirectiveKindMap[".loc"] = DK_LOC;
5292   DirectiveKindMap[".stabs"] = DK_STABS;
5293   DirectiveKindMap[".cv_file"] = DK_CV_FILE;
5294   DirectiveKindMap[".cv_func_id"] = DK_CV_FUNC_ID;
5295   DirectiveKindMap[".cv_loc"] = DK_CV_LOC;
5296   DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE;
5297   DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE;
5298   DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID;
5299   DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE;
5300   DirectiveKindMap[".cv_string"] = DK_CV_STRING;
5301   DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE;
5302   DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS;
5303   DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET;
5304   DirectiveKindMap[".cv_fpo_data"] = DK_CV_FPO_DATA;
5305   DirectiveKindMap[".sleb128"] = DK_SLEB128;
5306   DirectiveKindMap[".uleb128"] = DK_ULEB128;
5307   DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
5308   DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
5309   DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
5310   DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
5311   DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
5312   DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
5313   DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
5314   DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
5315   DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
5316   DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
5317   DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
5318   DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
5319   DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
5320   DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
5321   DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
5322   DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
5323   DirectiveKindMap[".cfi_return_column"] = DK_CFI_RETURN_COLUMN;
5324   DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
5325   DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
5326   DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
5327   DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
5328   DirectiveKindMap[".cfi_b_key_frame"] = DK_CFI_B_KEY_FRAME;
5329   DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
5330   DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
5331   DirectiveKindMap[".macro"] = DK_MACRO;
5332   DirectiveKindMap[".exitm"] = DK_EXITM;
5333   DirectiveKindMap[".endm"] = DK_ENDM;
5334   DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
5335   DirectiveKindMap[".purgem"] = DK_PURGEM;
5336   DirectiveKindMap[".err"] = DK_ERR;
5337   DirectiveKindMap[".error"] = DK_ERROR;
5338   DirectiveKindMap[".warning"] = DK_WARNING;
5339   DirectiveKindMap[".altmacro"] = DK_ALTMACRO;
5340   DirectiveKindMap[".noaltmacro"] = DK_NOALTMACRO;
5341   DirectiveKindMap[".reloc"] = DK_RELOC;
5342   DirectiveKindMap[".dc"] = DK_DC;
5343   DirectiveKindMap[".dc.a"] = DK_DC_A;
5344   DirectiveKindMap[".dc.b"] = DK_DC_B;
5345   DirectiveKindMap[".dc.d"] = DK_DC_D;
5346   DirectiveKindMap[".dc.l"] = DK_DC_L;
5347   DirectiveKindMap[".dc.s"] = DK_DC_S;
5348   DirectiveKindMap[".dc.w"] = DK_DC_W;
5349   DirectiveKindMap[".dc.x"] = DK_DC_X;
5350   DirectiveKindMap[".dcb"] = DK_DCB;
5351   DirectiveKindMap[".dcb.b"] = DK_DCB_B;
5352   DirectiveKindMap[".dcb.d"] = DK_DCB_D;
5353   DirectiveKindMap[".dcb.l"] = DK_DCB_L;
5354   DirectiveKindMap[".dcb.s"] = DK_DCB_S;
5355   DirectiveKindMap[".dcb.w"] = DK_DCB_W;
5356   DirectiveKindMap[".dcb.x"] = DK_DCB_X;
5357   DirectiveKindMap[".ds"] = DK_DS;
5358   DirectiveKindMap[".ds.b"] = DK_DS_B;
5359   DirectiveKindMap[".ds.d"] = DK_DS_D;
5360   DirectiveKindMap[".ds.l"] = DK_DS_L;
5361   DirectiveKindMap[".ds.p"] = DK_DS_P;
5362   DirectiveKindMap[".ds.s"] = DK_DS_S;
5363   DirectiveKindMap[".ds.w"] = DK_DS_W;
5364   DirectiveKindMap[".ds.x"] = DK_DS_X;
5365   DirectiveKindMap[".print"] = DK_PRINT;
5366   DirectiveKindMap[".addrsig"] = DK_ADDRSIG;
5367   DirectiveKindMap[".addrsig_sym"] = DK_ADDRSIG_SYM;
5368 }
5369
5370 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
5371   AsmToken EndToken, StartToken = getTok();
5372
5373   unsigned NestLevel = 0;
5374   while (true) {
5375     // Check whether we have reached the end of the file.
5376     if (getLexer().is(AsmToken::Eof)) {
5377       printError(DirectiveLoc, "no matching '.endr' in definition");
5378       return nullptr;
5379     }
5380
5381     if (Lexer.is(AsmToken::Identifier) &&
5382         (getTok().getIdentifier() == ".rep" ||
5383          getTok().getIdentifier() == ".rept" ||
5384          getTok().getIdentifier() == ".irp" ||
5385          getTok().getIdentifier() == ".irpc")) {
5386       ++NestLevel;
5387     }
5388
5389     // Otherwise, check whether we have reached the .endr.
5390     if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
5391       if (NestLevel == 0) {
5392         EndToken = getTok();
5393         Lex();
5394         if (Lexer.isNot(AsmToken::EndOfStatement)) {
5395           printError(getTok().getLoc(),
5396                      "unexpected token in '.endr' directive");
5397           return nullptr;
5398         }
5399         break;
5400       }
5401       --NestLevel;
5402     }
5403
5404     // Otherwise, scan till the end of the statement.
5405     eatToEndOfStatement();
5406   }
5407
5408   const char *BodyStart = StartToken.getLoc().getPointer();
5409   const char *BodyEnd = EndToken.getLoc().getPointer();
5410   StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
5411
5412   // We Are Anonymous.
5413   MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters());
5414   return &MacroLikeBodies.back();
5415 }
5416
5417 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
5418                                          raw_svector_ostream &OS) {
5419   OS << ".endr\n";
5420
5421   std::unique_ptr<MemoryBuffer> Instantiation =
5422       MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
5423
5424   // Create the macro instantiation object and add to the current macro
5425   // instantiation stack.
5426   MacroInstantiation *MI = new MacroInstantiation(
5427       DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size());
5428   ActiveMacros.push_back(MI);
5429
5430   // Jump to the macro instantiation and prime the lexer.
5431   CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
5432   Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
5433   Lex();
5434 }
5435
5436 /// parseDirectiveRept
5437 ///   ::= .rep | .rept count
5438 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) {
5439   const MCExpr *CountExpr;
5440   SMLoc CountLoc = getTok().getLoc();
5441   if (parseExpression(CountExpr))
5442     return true;
5443
5444   int64_t Count;
5445   if (!CountExpr->evaluateAsAbsolute(Count, getStreamer().getAssemblerPtr())) {
5446     return Error(CountLoc, "unexpected token in '" + Dir + "' directive");
5447   }
5448
5449   if (check(Count < 0, CountLoc, "Count is negative") ||
5450       parseToken(AsmToken::EndOfStatement,
5451                  "unexpected token in '" + Dir + "' directive"))
5452     return true;
5453
5454   // Lex the rept definition.
5455   MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5456   if (!M)
5457     return true;
5458
5459   // Macro instantiation is lexical, unfortunately. We construct a new buffer
5460   // to hold the macro body with substitutions.
5461   SmallString<256> Buf;
5462   raw_svector_ostream OS(Buf);
5463   while (Count--) {
5464     // Note that the AtPseudoVariable is disabled for instantiations of .rep(t).
5465     if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc()))
5466       return true;
5467   }
5468   instantiateMacroLikeBody(M, DirectiveLoc, OS);
5469
5470   return false;
5471 }
5472
5473 /// parseDirectiveIrp
5474 /// ::= .irp symbol,values
5475 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
5476   MCAsmMacroParameter Parameter;
5477   MCAsmMacroArguments A;
5478   if (check(parseIdentifier(Parameter.Name),
5479             "expected identifier in '.irp' directive") ||
5480       parseToken(AsmToken::Comma, "expected comma in '.irp' directive") ||
5481       parseMacroArguments(nullptr, A) ||
5482       parseToken(AsmToken::EndOfStatement, "expected End of Statement"))
5483     return true;
5484
5485   // Lex the irp definition.
5486   MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5487   if (!M)
5488     return true;
5489
5490   // Macro instantiation is lexical, unfortunately. We construct a new buffer
5491   // to hold the macro body with substitutions.
5492   SmallString<256> Buf;
5493   raw_svector_ostream OS(Buf);
5494
5495   for (const MCAsmMacroArgument &Arg : A) {
5496     // Note that the AtPseudoVariable is enabled for instantiations of .irp.
5497     // This is undocumented, but GAS seems to support it.
5498     if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
5499       return true;
5500   }
5501
5502   instantiateMacroLikeBody(M, DirectiveLoc, OS);
5503
5504   return false;
5505 }
5506
5507 /// parseDirectiveIrpc
5508 /// ::= .irpc symbol,values
5509 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
5510   MCAsmMacroParameter Parameter;
5511   MCAsmMacroArguments A;
5512
5513   if (check(parseIdentifier(Parameter.Name),
5514             "expected identifier in '.irpc' directive") ||
5515       parseToken(AsmToken::Comma, "expected comma in '.irpc' directive") ||
5516       parseMacroArguments(nullptr, A))
5517     return true;
5518
5519   if (A.size() != 1 || A.front().size() != 1)
5520     return TokError("unexpected token in '.irpc' directive");
5521
5522   // Eat the end of statement.
5523   if (parseToken(AsmToken::EndOfStatement, "expected end of statement"))
5524     return true;
5525
5526   // Lex the irpc definition.
5527   MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5528   if (!M)
5529     return true;
5530
5531   // Macro instantiation is lexical, unfortunately. We construct a new buffer
5532   // to hold the macro body with substitutions.
5533   SmallString<256> Buf;
5534   raw_svector_ostream OS(Buf);
5535
5536   StringRef Values = A.front().front().getString();
5537   for (std::size_t I = 0, End = Values.size(); I != End; ++I) {
5538     MCAsmMacroArgument Arg;
5539     Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1));
5540
5541     // Note that the AtPseudoVariable is enabled for instantiations of .irpc.
5542     // This is undocumented, but GAS seems to support it.
5543     if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
5544       return true;
5545   }
5546
5547   instantiateMacroLikeBody(M, DirectiveLoc, OS);
5548
5549   return false;
5550 }
5551
5552 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
5553   if (ActiveMacros.empty())
5554     return TokError("unmatched '.endr' directive");
5555
5556   // The only .repl that should get here are the ones created by
5557   // instantiateMacroLikeBody.
5558   assert(getLexer().is(AsmToken::EndOfStatement));
5559
5560   handleMacroExit();
5561   return false;
5562 }
5563
5564 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
5565                                      size_t Len) {
5566   const MCExpr *Value;
5567   SMLoc ExprLoc = getLexer().getLoc();
5568   if (parseExpression(Value))
5569     return true;
5570   const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
5571   if (!MCE)
5572     return Error(ExprLoc, "unexpected expression in _emit");
5573   uint64_t IntValue = MCE->getValue();
5574   if (!isUInt<8>(IntValue) && !isInt<8>(IntValue))
5575     return Error(ExprLoc, "literal value out of range for directive");
5576
5577   Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len);
5578   return false;
5579 }
5580
5581 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
5582   const MCExpr *Value;
5583   SMLoc ExprLoc = getLexer().getLoc();
5584   if (parseExpression(Value))
5585     return true;
5586   const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
5587   if (!MCE)
5588     return Error(ExprLoc, "unexpected expression in align");
5589   uint64_t IntValue = MCE->getValue();
5590   if (!isPowerOf2_64(IntValue))
5591     return Error(ExprLoc, "literal value not a power of two greater then zero");
5592
5593   Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue));
5594   return false;
5595 }
5596
5597 bool AsmParser::parseDirectivePrint(SMLoc DirectiveLoc) {
5598   const AsmToken StrTok = getTok();
5599   Lex();
5600   if (StrTok.isNot(AsmToken::String) || StrTok.getString().front() != '"')
5601     return Error(DirectiveLoc, "expected double quoted string after .print");
5602   if (parseToken(AsmToken::EndOfStatement, "expected end of statement"))
5603     return true;
5604   llvm::outs() << StrTok.getStringContents() << '\n';
5605   return false;
5606 }
5607
5608 bool AsmParser::parseDirectiveAddrsig() {
5609   getStreamer().EmitAddrsig();
5610   return false;
5611 }
5612
5613 bool AsmParser::parseDirectiveAddrsigSym() {
5614   StringRef Name;
5615   if (check(parseIdentifier(Name),
5616             "expected identifier in '.addrsig_sym' directive"))
5617     return true;
5618   MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
5619   getStreamer().EmitAddrsigSym(Sym);
5620   return false;
5621 }
5622
5623 // We are comparing pointers, but the pointers are relative to a single string.
5624 // Thus, this should always be deterministic.
5625 static int rewritesSort(const AsmRewrite *AsmRewriteA,
5626                         const AsmRewrite *AsmRewriteB) {
5627   if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
5628     return -1;
5629   if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
5630     return 1;
5631
5632   // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
5633   // rewrite to the same location.  Make sure the SizeDirective rewrite is
5634   // performed first, then the Imm/ImmPrefix and finally the Input/Output.  This
5635   // ensures the sort algorithm is stable.
5636   if (AsmRewritePrecedence[AsmRewriteA->Kind] >
5637       AsmRewritePrecedence[AsmRewriteB->Kind])
5638     return -1;
5639
5640   if (AsmRewritePrecedence[AsmRewriteA->Kind] <
5641       AsmRewritePrecedence[AsmRewriteB->Kind])
5642     return 1;
5643   llvm_unreachable("Unstable rewrite sort.");
5644 }
5645
5646 bool AsmParser::parseMSInlineAsm(
5647     void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
5648     unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool>> &OpDecls,
5649     SmallVectorImpl<std::string> &Constraints,
5650     SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
5651     const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) {
5652   SmallVector<void *, 4> InputDecls;
5653   SmallVector<void *, 4> OutputDecls;
5654   SmallVector<bool, 4> InputDeclsAddressOf;
5655   SmallVector<bool, 4> OutputDeclsAddressOf;
5656   SmallVector<std::string, 4> InputConstraints;
5657   SmallVector<std::string, 4> OutputConstraints;
5658   SmallVector<unsigned, 4> ClobberRegs;
5659
5660   SmallVector<AsmRewrite, 4> AsmStrRewrites;
5661
5662   // Prime the lexer.
5663   Lex();
5664
5665   // While we have input, parse each statement.
5666   unsigned InputIdx = 0;
5667   unsigned OutputIdx = 0;
5668   while (getLexer().isNot(AsmToken::Eof)) {
5669     // Parse curly braces marking block start/end
5670     if (parseCurlyBlockScope(AsmStrRewrites))
5671       continue;
5672
5673     ParseStatementInfo Info(&AsmStrRewrites);
5674     bool StatementErr = parseStatement(Info, &SI);
5675
5676     if (StatementErr || Info.ParseError) {
5677       // Emit pending errors if any exist.
5678       printPendingErrors();
5679       return true;
5680     }
5681
5682     // No pending error should exist here.
5683     assert(!hasPendingError() && "unexpected error from parseStatement");
5684
5685     if (Info.Opcode == ~0U)
5686       continue;
5687
5688     const MCInstrDesc &Desc = MII->get(Info.Opcode);
5689
5690     // Build the list of clobbers, outputs and inputs.
5691     for (unsigned i = 1, e = Info.ParsedOperands.size(); i != e; ++i) {
5692       MCParsedAsmOperand &Operand = *Info.ParsedOperands[i];
5693
5694       // Immediate.
5695       if (Operand.isImm())
5696         continue;
5697
5698       // Register operand.
5699       if (Operand.isReg() && !Operand.needAddressOf() &&
5700           !getTargetParser().OmitRegisterFromClobberLists(Operand.getReg())) {
5701         unsigned NumDefs = Desc.getNumDefs();
5702         // Clobber.
5703         if (NumDefs && Operand.getMCOperandNum() < NumDefs)
5704           ClobberRegs.push_back(Operand.getReg());
5705         continue;
5706       }
5707
5708       // Expr/Input or Output.
5709       StringRef SymName = Operand.getSymName();
5710       if (SymName.empty())
5711         continue;
5712
5713       void *OpDecl = Operand.getOpDecl();
5714       if (!OpDecl)
5715         continue;
5716
5717       bool isOutput = (i == 1) && Desc.mayStore();
5718       SMLoc Start = SMLoc::getFromPointer(SymName.data());
5719       if (isOutput) {
5720         ++InputIdx;
5721         OutputDecls.push_back(OpDecl);
5722         OutputDeclsAddressOf.push_back(Operand.needAddressOf());
5723         OutputConstraints.push_back(("=" + Operand.getConstraint()).str());
5724         AsmStrRewrites.emplace_back(AOK_Output, Start, SymName.size());
5725       } else {
5726         InputDecls.push_back(OpDecl);
5727         InputDeclsAddressOf.push_back(Operand.needAddressOf());
5728         InputConstraints.push_back(Operand.getConstraint().str());
5729         AsmStrRewrites.emplace_back(AOK_Input, Start, SymName.size());
5730       }
5731     }
5732
5733     // Consider implicit defs to be clobbers.  Think of cpuid and push.
5734     ArrayRef<MCPhysReg> ImpDefs(Desc.getImplicitDefs(),
5735                                 Desc.getNumImplicitDefs());
5736     ClobberRegs.insert(ClobberRegs.end(), ImpDefs.begin(), ImpDefs.end());
5737   }
5738
5739   // Set the number of Outputs and Inputs.
5740   NumOutputs = OutputDecls.size();
5741   NumInputs = InputDecls.size();
5742
5743   // Set the unique clobbers.
5744   array_pod_sort(ClobberRegs.begin(), ClobberRegs.end());
5745   ClobberRegs.erase(std::unique(ClobberRegs.begin(), ClobberRegs.end()),
5746                     ClobberRegs.end());
5747   Clobbers.assign(ClobberRegs.size(), std::string());
5748   for (unsigned I = 0, E = ClobberRegs.size(); I != E; ++I) {
5749     raw_string_ostream OS(Clobbers[I]);
5750     IP->printRegName(OS, ClobberRegs[I]);
5751   }
5752
5753   // Merge the various outputs and inputs.  Output are expected first.
5754   if (NumOutputs || NumInputs) {
5755     unsigned NumExprs = NumOutputs + NumInputs;
5756     OpDecls.resize(NumExprs);
5757     Constraints.resize(NumExprs);
5758     for (unsigned i = 0; i < NumOutputs; ++i) {
5759       OpDecls[i] = std::make_pair(OutputDecls[i], OutputDeclsAddressOf[i]);
5760       Constraints[i] = OutputConstraints[i];
5761     }
5762     for (unsigned i = 0, j = NumOutputs; i < NumInputs; ++i, ++j) {
5763       OpDecls[j] = std::make_pair(InputDecls[i], InputDeclsAddressOf[i]);
5764       Constraints[j] = InputConstraints[i];
5765     }
5766   }
5767
5768   // Build the IR assembly string.
5769   std::string AsmStringIR;
5770   raw_string_ostream OS(AsmStringIR);
5771   StringRef ASMString =
5772       SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer();
5773   const char *AsmStart = ASMString.begin();
5774   const char *AsmEnd = ASMString.end();
5775   array_pod_sort(AsmStrRewrites.begin(), AsmStrRewrites.end(), rewritesSort);
5776   for (const AsmRewrite &AR : AsmStrRewrites) {
5777     AsmRewriteKind Kind = AR.Kind;
5778
5779     const char *Loc = AR.Loc.getPointer();
5780     assert(Loc >= AsmStart && "Expected Loc to be at or after Start!");
5781
5782     // Emit everything up to the immediate/expression.
5783     if (unsigned Len = Loc - AsmStart)
5784       OS << StringRef(AsmStart, Len);
5785
5786     // Skip the original expression.
5787     if (Kind == AOK_Skip) {
5788       AsmStart = Loc + AR.Len;
5789       continue;
5790     }
5791
5792     unsigned AdditionalSkip = 0;
5793     // Rewrite expressions in $N notation.
5794     switch (Kind) {
5795     default:
5796       break;
5797     case AOK_IntelExpr:
5798       assert(AR.IntelExp.isValid() && "cannot write invalid intel expression");
5799       if (AR.IntelExp.NeedBracs)
5800         OS << "[";
5801       if (AR.IntelExp.hasBaseReg())
5802         OS << AR.IntelExp.BaseReg;
5803       if (AR.IntelExp.hasIndexReg())
5804         OS << (AR.IntelExp.hasBaseReg() ? " + " : "")
5805            << AR.IntelExp.IndexReg;
5806       if (AR.IntelExp.Scale > 1)
5807           OS << " * $$" << AR.IntelExp.Scale;
5808       if (AR.IntelExp.Imm || !AR.IntelExp.hasRegs())
5809         OS << (AR.IntelExp.hasRegs() ? " + $$" : "$$") << AR.IntelExp.Imm;
5810       if (AR.IntelExp.NeedBracs)
5811         OS << "]";
5812       break;
5813     case AOK_Label:
5814       OS << Ctx.getAsmInfo()->getPrivateLabelPrefix() << AR.Label;
5815       break;
5816     case AOK_Input:
5817       OS << '$' << InputIdx++;
5818       break;
5819     case AOK_Output:
5820       OS << '$' << OutputIdx++;
5821       break;
5822     case AOK_SizeDirective:
5823       switch (AR.Val) {
5824       default: break;
5825       case 8:  OS << "byte ptr "; break;
5826       case 16: OS << "word ptr "; break;
5827       case 32: OS << "dword ptr "; break;
5828       case 64: OS << "qword ptr "; break;
5829       case 80: OS << "xword ptr "; break;
5830       case 128: OS << "xmmword ptr "; break;
5831       case 256: OS << "ymmword ptr "; break;
5832       }
5833       break;
5834     case AOK_Emit:
5835       OS << ".byte";
5836       break;
5837     case AOK_Align: {
5838       // MS alignment directives are measured in bytes. If the native assembler
5839       // measures alignment in bytes, we can pass it straight through.
5840       OS << ".align";
5841       if (getContext().getAsmInfo()->getAlignmentIsInBytes())
5842         break;
5843
5844       // Alignment is in log2 form, so print that instead and skip the original
5845       // immediate.
5846       unsigned Val = AR.Val;
5847       OS << ' ' << Val;
5848       assert(Val < 10 && "Expected alignment less then 2^10.");
5849       AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
5850       break;
5851     }
5852     case AOK_EVEN:
5853       OS << ".even";
5854       break;
5855     case AOK_EndOfStatement:
5856       OS << "\n\t";
5857       break;
5858     }
5859
5860     // Skip the original expression.
5861     AsmStart = Loc + AR.Len + AdditionalSkip;
5862   }
5863
5864   // Emit the remainder of the asm string.
5865   if (AsmStart != AsmEnd)
5866     OS << StringRef(AsmStart, AsmEnd - AsmStart);
5867
5868   AsmString = OS.str();
5869   return false;
5870 }
5871
5872 namespace llvm {
5873 namespace MCParserUtils {
5874
5875 /// Returns whether the given symbol is used anywhere in the given expression,
5876 /// or subexpressions.
5877 static bool isSymbolUsedInExpression(const MCSymbol *Sym, const MCExpr *Value) {
5878   switch (Value->getKind()) {
5879   case MCExpr::Binary: {
5880     const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Value);
5881     return isSymbolUsedInExpression(Sym, BE->getLHS()) ||
5882            isSymbolUsedInExpression(Sym, BE->getRHS());
5883   }
5884   case MCExpr::Target:
5885   case MCExpr::Constant:
5886     return false;
5887   case MCExpr::SymbolRef: {
5888     const MCSymbol &S =
5889         static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
5890     if (S.isVariable())
5891       return isSymbolUsedInExpression(Sym, S.getVariableValue());
5892     return &S == Sym;
5893   }
5894   case MCExpr::Unary:
5895     return isSymbolUsedInExpression(
5896         Sym, static_cast<const MCUnaryExpr *>(Value)->getSubExpr());
5897   }
5898
5899   llvm_unreachable("Unknown expr kind!");
5900 }
5901
5902 bool parseAssignmentExpression(StringRef Name, bool allow_redef,
5903                                MCAsmParser &Parser, MCSymbol *&Sym,
5904                                const MCExpr *&Value) {
5905
5906   // FIXME: Use better location, we should use proper tokens.
5907   SMLoc EqualLoc = Parser.getTok().getLoc();
5908   if (Parser.parseExpression(Value))
5909     return Parser.TokError("missing expression");
5910
5911   // Note: we don't count b as used in "a = b". This is to allow
5912   // a = b
5913   // b = c
5914
5915   if (Parser.parseToken(AsmToken::EndOfStatement))
5916     return true;
5917
5918   // Validate that the LHS is allowed to be a variable (either it has not been
5919   // used as a symbol, or it is an absolute symbol).
5920   Sym = Parser.getContext().lookupSymbol(Name);
5921   if (Sym) {
5922     // Diagnose assignment to a label.
5923     //
5924     // FIXME: Diagnostics. Note the location of the definition as a label.
5925     // FIXME: Diagnose assignment to protected identifier (e.g., register name).
5926     if (isSymbolUsedInExpression(Sym, Value))
5927       return Parser.Error(EqualLoc, "Recursive use of '" + Name + "'");
5928     else if (Sym->isUndefined(/*SetUsed*/ false) && !Sym->isUsed() &&
5929              !Sym->isVariable())
5930       ; // Allow redefinitions of undefined symbols only used in directives.
5931     else if (Sym->isVariable() && !Sym->isUsed() && allow_redef)
5932       ; // Allow redefinitions of variables that haven't yet been used.
5933     else if (!Sym->isUndefined() && (!Sym->isVariable() || !allow_redef))
5934       return Parser.Error(EqualLoc, "redefinition of '" + Name + "'");
5935     else if (!Sym->isVariable())
5936       return Parser.Error(EqualLoc, "invalid assignment to '" + Name + "'");
5937     else if (!isa<MCConstantExpr>(Sym->getVariableValue()))
5938       return Parser.Error(EqualLoc,
5939                           "invalid reassignment of non-absolute variable '" +
5940                               Name + "'");
5941   } else if (Name == ".") {
5942     Parser.getStreamer().emitValueToOffset(Value, 0, EqualLoc);
5943     return false;
5944   } else
5945     Sym = Parser.getContext().getOrCreateSymbol(Name);
5946
5947   Sym->setRedefinable(allow_redef);
5948
5949   return false;
5950 }
5951
5952 } // end namespace MCParserUtils
5953 } // end namespace llvm
5954
5955 /// Create an MCAsmParser instance.
5956 MCAsmParser *llvm::createMCAsmParser(SourceMgr &SM, MCContext &C,
5957                                      MCStreamer &Out, const MCAsmInfo &MAI,
5958                                      unsigned CB) {
5959   return new AsmParser(SM, C, Out, MAI, CB);
5960 }