llvm/lib/AsmParser/LLLexer.cpp

   1 //===- LLLexer.cpp - Lexer for .ll 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 // Implement the Lexer for .ll files.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/AsmParser/LLLexer.h"
  14 #include "llvm/ADT/APInt.h"
  15 #include "llvm/ADT/STLExtras.h"
  16 #include "llvm/ADT/StringExtras.h"
  17 #include "llvm/ADT/Twine.h"
  18 #include "llvm/IR/DerivedTypes.h"
  19 #include "llvm/IR/Instruction.h"
  20 #include "llvm/Support/ErrorHandling.h"
  21 #include "llvm/Support/SourceMgr.h"
  22 #include <cassert>
  23 #include <cctype>
  24 #include <cstdio>
  25
  26 using namespace llvm;
  27
  28 bool LLLexer::Error(LocTy ErrorLoc, const Twine &Msg) const {
  29   ErrorInfo = SM.GetMessage(ErrorLoc, SourceMgr::DK_Error, Msg);
  30   return true;
  31 }
  32
  33 void LLLexer::Warning(LocTy WarningLoc, const Twine &Msg) const {
  34   SM.PrintMessage(WarningLoc, SourceMgr::DK_Warning, Msg);
  35 }
  36
  37 //===----------------------------------------------------------------------===//
  38 // Helper functions.
  39 //===----------------------------------------------------------------------===//
  40
  41 // atoull - Convert an ascii string of decimal digits into the unsigned long
  42 // long representation... this does not have to do input error checking,
  43 // because we know that the input will be matched by a suitable regex...
  44 //
  45 uint64_t LLLexer::atoull(const char *Buffer, const char *End) {
  46   uint64_t Result = 0;
  47   for (; Buffer != End; Buffer++) {
  48     uint64_t OldRes = Result;
  49     Result *= 10;
  50     Result += *Buffer-'0';
  51     if (Result < OldRes) {  // Uh, oh, overflow detected!!!
  52       Error("constant bigger than 64 bits detected!");
  53       return 0;
  54     }
  55   }
  56   return Result;
  57 }
  58
  59 uint64_t LLLexer::HexIntToVal(const char *Buffer, const char *End) {
  60   uint64_t Result = 0;
  61   for (; Buffer != End; ++Buffer) {
  62     uint64_t OldRes = Result;
  63     Result *= 16;
  64     Result += hexDigitValue(*Buffer);
  65
  66     if (Result < OldRes) {   // Uh, oh, overflow detected!!!
  67       Error("constant bigger than 64 bits detected!");
  68       return 0;
  69     }
  70   }
  71   return Result;
  72 }
  73
  74 void LLLexer::HexToIntPair(const char *Buffer, const char *End,
  75                            uint64_t Pair[2]) {
  76   Pair[0] = 0;
  77   if (End - Buffer >= 16) {
  78     for (int i = 0; i < 16; i++, Buffer++) {
  79       assert(Buffer != End);
  80       Pair[0] *= 16;
  81       Pair[0] += hexDigitValue(*Buffer);
  82     }
  83   }
  84   Pair[1] = 0;
  85   for (int i = 0; i < 16 && Buffer != End; i++, Buffer++) {
  86     Pair[1] *= 16;
  87     Pair[1] += hexDigitValue(*Buffer);
  88   }
  89   if (Buffer != End)
  90     Error("constant bigger than 128 bits detected!");
  91 }
  92
  93 /// FP80HexToIntPair - translate an 80 bit FP80 number (20 hexits) into
  94 /// { low64, high16 } as usual for an APInt.
  95 void LLLexer::FP80HexToIntPair(const char *Buffer, const char *End,
  96                            uint64_t Pair[2]) {
  97   Pair[1] = 0;
  98   for (int i=0; i<4 && Buffer != End; i++, Buffer++) {
  99     assert(Buffer != End);
 100     Pair[1] *= 16;
 101     Pair[1] += hexDigitValue(*Buffer);
 102   }
 103   Pair[0] = 0;
 104   for (int i = 0; i < 16 && Buffer != End; i++, Buffer++) {
 105     Pair[0] *= 16;
 106     Pair[0] += hexDigitValue(*Buffer);
 107   }
 108   if (Buffer != End)
 109     Error("constant bigger than 128 bits detected!");
 110 }
 111
 112 // UnEscapeLexed - Run through the specified buffer and change \xx codes to the
 113 // appropriate character.
 114 static void UnEscapeLexed(std::string &Str) {
 115   if (Str.empty()) return;
 116
 117   char *Buffer = &Str[0], *EndBuffer = Buffer+Str.size();
 118   char *BOut = Buffer;
 119   for (char *BIn = Buffer; BIn != EndBuffer; ) {
 120     if (BIn[0] == '\\') {
 121       if (BIn < EndBuffer-1 && BIn[1] == '\\') {
 122         *BOut++ = '\\'; // Two \ becomes one
 123         BIn += 2;
 124       } else if (BIn < EndBuffer-2 &&
 125                  isxdigit(static_cast<unsigned char>(BIn[1])) &&
 126                  isxdigit(static_cast<unsigned char>(BIn[2]))) {
 127         *BOut = hexDigitValue(BIn[1]) * 16 + hexDigitValue(BIn[2]);
 128         BIn += 3;                           // Skip over handled chars
 129         ++BOut;
 130       } else {
 131         *BOut++ = *BIn++;
 132       }
 133     } else {
 134       *BOut++ = *BIn++;
 135     }
 136   }
 137   Str.resize(BOut-Buffer);
 138 }
 139
 140 /// isLabelChar - Return true for [-a-zA-Z$._0-9].
 141 static bool isLabelChar(char C) {
 142   return isalnum(static_cast<unsigned char>(C)) || C == '-' || C == '$' ||
 143          C == '.' || C == '_';
 144 }
 145
 146 /// isLabelTail - Return true if this pointer points to a valid end of a label.
 147 static const char *isLabelTail(const char *CurPtr) {
 148   while (true) {
 149     if (CurPtr[0] == ':') return CurPtr+1;
 150     if (!isLabelChar(CurPtr[0])) return nullptr;
 151     ++CurPtr;
 152   }
 153 }
 154
 155 //===----------------------------------------------------------------------===//
 156 // Lexer definition.
 157 //===----------------------------------------------------------------------===//
 158
 159 LLLexer::LLLexer(StringRef StartBuf, SourceMgr &SM, SMDiagnostic &Err,
 160                  LLVMContext &C)
 161     : CurBuf(StartBuf), ErrorInfo(Err), SM(SM), Context(C), APFloatVal(0.0),
 162       IgnoreColonInIdentifiers(false) {
 163   CurPtr = CurBuf.begin();
 164 }
 165
 166 int LLLexer::getNextChar() {
 167   char CurChar = *CurPtr++;
 168   switch (CurChar) {
 169   default: return (unsigned char)CurChar;
 170   case 0:
 171     // A nul character in the stream is either the end of the current buffer or
 172     // a random nul in the file.  Disambiguate that here.
 173     if (CurPtr-1 != CurBuf.end())
 174       return 0;  // Just whitespace.
 175
 176     // Otherwise, return end of file.
 177     --CurPtr;  // Another call to lex will return EOF again.
 178     return EOF;
 179   }
 180 }
 181
 182 lltok::Kind LLLexer::LexToken() {
 183   while (true) {
 184     TokStart = CurPtr;
 185
 186     int CurChar = getNextChar();
 187     switch (CurChar) {
 188     default:
 189       // Handle letters: [a-zA-Z_]
 190       if (isalpha(static_cast<unsigned char>(CurChar)) || CurChar == '_')
 191         return LexIdentifier();
 192
 193       return lltok::Error;
 194     case EOF: return lltok::Eof;
 195     case 0:
 196     case ' ':
 197     case '\t':
 198     case '\n':
 199     case '\r':
 200       // Ignore whitespace.
 201       continue;
 202     case '+': return LexPositive();
 203     case '@': return LexAt();
 204     case '$': return LexDollar();
 205     case '%': return LexPercent();
 206     case '"': return LexQuote();
 207     case '.':
 208       if (const char *Ptr = isLabelTail(CurPtr)) {
 209         CurPtr = Ptr;
 210         StrVal.assign(TokStart, CurPtr-1);
 211         return lltok::LabelStr;
 212       }
 213       if (CurPtr[0] == '.' && CurPtr[1] == '.') {
 214         CurPtr += 2;
 215         return lltok::dotdotdot;
 216       }
 217       return lltok::Error;
 218     case ';':
 219       SkipLineComment();
 220       continue;
 221     case '!': return LexExclaim();
 222     case '^':
 223       return LexCaret();
 224     case ':':
 225       return lltok::colon;
 226     case '#': return LexHash();
 227     case '0': case '1': case '2': case '3': case '4':
 228     case '5': case '6': case '7': case '8': case '9':
 229     case '-':
 230       return LexDigitOrNegative();
 231     case '=': return lltok::equal;
 232     case '[': return lltok::lsquare;
 233     case ']': return lltok::rsquare;
 234     case '{': return lltok::lbrace;
 235     case '}': return lltok::rbrace;
 236     case '<': return lltok::less;
 237     case '>': return lltok::greater;
 238     case '(': return lltok::lparen;
 239     case ')': return lltok::rparen;
 240     case ',': return lltok::comma;
 241     case '*': return lltok::star;
 242     case '|': return lltok::bar;
 243     }
 244   }
 245 }
 246
 247 void LLLexer::SkipLineComment() {
 248   while (true) {
 249     if (CurPtr[0] == '\n' || CurPtr[0] == '\r' || getNextChar() == EOF)
 250       return;
 251   }
 252 }
 253
 254 /// Lex all tokens that start with an @ character.
 255 ///   GlobalVar   @\"[^\"]*\"
 256 ///   GlobalVar   @[-a-zA-Z$._][-a-zA-Z$._0-9]*
 257 ///   GlobalVarID @[0-9]+
 258 lltok::Kind LLLexer::LexAt() {
 259   return LexVar(lltok::GlobalVar, lltok::GlobalID);
 260 }
 261
 262 lltok::Kind LLLexer::LexDollar() {
 263   if (const char *Ptr = isLabelTail(TokStart)) {
 264     CurPtr = Ptr;
 265     StrVal.assign(TokStart, CurPtr - 1);
 266     return lltok::LabelStr;
 267   }
 268
 269   // Handle DollarStringConstant: $\"[^\"]*\"
 270   if (CurPtr[0] == '"') {
 271     ++CurPtr;
 272
 273     while (true) {
 274       int CurChar = getNextChar();
 275
 276       if (CurChar == EOF) {
 277         Error("end of file in COMDAT variable name");
 278         return lltok::Error;
 279       }
 280       if (CurChar == '"') {
 281         StrVal.assign(TokStart + 2, CurPtr - 1);
 282         UnEscapeLexed(StrVal);
 283         if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
 284           Error("Null bytes are not allowed in names");
 285           return lltok::Error;
 286         }
 287         return lltok::ComdatVar;
 288       }
 289     }
 290   }
 291
 292   // Handle ComdatVarName: $[-a-zA-Z$._][-a-zA-Z$._0-9]*
 293   if (ReadVarName())
 294     return lltok::ComdatVar;
 295
 296   return lltok::Error;
 297 }
 298
 299 /// ReadString - Read a string until the closing quote.
 300 lltok::Kind LLLexer::ReadString(lltok::Kind kind) {
 301   const char *Start = CurPtr;
 302   while (true) {
 303     int CurChar = getNextChar();
 304
 305     if (CurChar == EOF) {
 306       Error("end of file in string constant");
 307       return lltok::Error;
 308     }
 309     if (CurChar == '"') {
 310       StrVal.assign(Start, CurPtr-1);
 311       UnEscapeLexed(StrVal);
 312       return kind;
 313     }
 314   }
 315 }
 316
 317 /// ReadVarName - Read the rest of a token containing a variable name.
 318 bool LLLexer::ReadVarName() {
 319   const char *NameStart = CurPtr;
 320   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
 321       CurPtr[0] == '-' || CurPtr[0] == '$' ||
 322       CurPtr[0] == '.' || CurPtr[0] == '_') {
 323     ++CurPtr;
 324     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
 325            CurPtr[0] == '-' || CurPtr[0] == '$' ||
 326            CurPtr[0] == '.' || CurPtr[0] == '_')
 327       ++CurPtr;
 328
 329     StrVal.assign(NameStart, CurPtr);
 330     return true;
 331   }
 332   return false;
 333 }
 334
 335 // Lex an ID: [0-9]+. On success, the ID is stored in UIntVal and Token is
 336 // returned, otherwise the Error token is returned.
 337 lltok::Kind LLLexer::LexUIntID(lltok::Kind Token) {
 338   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
 339     return lltok::Error;
 340
 341   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
 342     /*empty*/;
 343
 344   uint64_t Val = atoull(TokStart + 1, CurPtr);
 345   if ((unsigned)Val != Val)
 346     Error("invalid value number (too large)!");
 347   UIntVal = unsigned(Val);
 348   return Token;
 349 }
 350
 351 lltok::Kind LLLexer::LexVar(lltok::Kind Var, lltok::Kind VarID) {
 352   // Handle StringConstant: \"[^\"]*\"
 353   if (CurPtr[0] == '"') {
 354     ++CurPtr;
 355
 356     while (true) {
 357       int CurChar = getNextChar();
 358
 359       if (CurChar == EOF) {
 360         Error("end of file in global variable name");
 361         return lltok::Error;
 362       }
 363       if (CurChar == '"') {
 364         StrVal.assign(TokStart+2, CurPtr-1);
 365         UnEscapeLexed(StrVal);
 366         if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
 367           Error("Null bytes are not allowed in names");
 368           return lltok::Error;
 369         }
 370         return Var;
 371       }
 372     }
 373   }
 374
 375   // Handle VarName: [-a-zA-Z$._][-a-zA-Z$._0-9]*
 376   if (ReadVarName())
 377     return Var;
 378
 379   // Handle VarID: [0-9]+
 380   return LexUIntID(VarID);
 381 }
 382
 383 /// Lex all tokens that start with a % character.
 384 ///   LocalVar   ::= %\"[^\"]*\"
 385 ///   LocalVar   ::= %[-a-zA-Z$._][-a-zA-Z$._0-9]*
 386 ///   LocalVarID ::= %[0-9]+
 387 lltok::Kind LLLexer::LexPercent() {
 388   return LexVar(lltok::LocalVar, lltok::LocalVarID);
 389 }
 390
 391 /// Lex all tokens that start with a " character.
 392 ///   QuoteLabel        "[^"]+":
 393 ///   StringConstant    "[^"]*"
 394 lltok::Kind LLLexer::LexQuote() {
 395   lltok::Kind kind = ReadString(lltok::StringConstant);
 396   if (kind == lltok::Error || kind == lltok::Eof)
 397     return kind;
 398
 399   if (CurPtr[0] == ':') {
 400     ++CurPtr;
 401     if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
 402       Error("Null bytes are not allowed in names");
 403       kind = lltok::Error;
 404     } else {
 405       kind = lltok::LabelStr;
 406     }
 407   }
 408
 409   return kind;
 410 }
 411
 412 /// Lex all tokens that start with a ! character.
 413 ///    !foo
 414 ///    !
 415 lltok::Kind LLLexer::LexExclaim() {
 416   // Lex a metadata name as a MetadataVar.
 417   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
 418       CurPtr[0] == '-' || CurPtr[0] == '$' ||
 419       CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\') {
 420     ++CurPtr;
 421     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
 422            CurPtr[0] == '-' || CurPtr[0] == '$' ||
 423            CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\')
 424       ++CurPtr;
 425
 426     StrVal.assign(TokStart+1, CurPtr);   // Skip !
 427     UnEscapeLexed(StrVal);
 428     return lltok::MetadataVar;
 429   }
 430   return lltok::exclaim;
 431 }
 432
 433 /// Lex all tokens that start with a ^ character.
 434 ///    SummaryID ::= ^[0-9]+
 435 lltok::Kind LLLexer::LexCaret() {
 436   // Handle SummaryID: ^[0-9]+
 437   return LexUIntID(lltok::SummaryID);
 438 }
 439
 440 /// Lex all tokens that start with a # character.
 441 ///    AttrGrpID ::= #[0-9]+
 442 lltok::Kind LLLexer::LexHash() {
 443   // Handle AttrGrpID: #[0-9]+
 444   return LexUIntID(lltok::AttrGrpID);
 445 }
 446
 447 /// Lex a label, integer type, keyword, or hexadecimal integer constant.
 448 ///    Label           [-a-zA-Z$._0-9]+:
 449 ///    IntegerType     i[0-9]+
 450 ///    Keyword         sdiv, float, ...
 451 ///    HexIntConstant  [us]0x[0-9A-Fa-f]+
 452 lltok::Kind LLLexer::LexIdentifier() {
 453   const char *StartChar = CurPtr;
 454   const char *IntEnd = CurPtr[-1] == 'i' ? nullptr : StartChar;
 455   const char *KeywordEnd = nullptr;
 456
 457   for (; isLabelChar(*CurPtr); ++CurPtr) {
 458     // If we decide this is an integer, remember the end of the sequence.
 459     if (!IntEnd && !isdigit(static_cast<unsigned char>(*CurPtr)))
 460       IntEnd = CurPtr;
 461     if (!KeywordEnd && !isalnum(static_cast<unsigned char>(*CurPtr)) &&
 462         *CurPtr != '_')
 463       KeywordEnd = CurPtr;
 464   }
 465
 466   // If we stopped due to a colon, unless we were directed to ignore it,
 467   // this really is a label.
 468   if (!IgnoreColonInIdentifiers && *CurPtr == ':') {
 469     StrVal.assign(StartChar-1, CurPtr++);
 470     return lltok::LabelStr;
 471   }
 472
 473   // Otherwise, this wasn't a label.  If this was valid as an integer type,
 474   // return it.
 475   if (!IntEnd) IntEnd = CurPtr;
 476   if (IntEnd != StartChar) {
 477     CurPtr = IntEnd;
 478     uint64_t NumBits = atoull(StartChar, CurPtr);
 479     if (NumBits < IntegerType::MIN_INT_BITS ||
 480         NumBits > IntegerType::MAX_INT_BITS) {
 481       Error("bitwidth for integer type out of range!");
 482       return lltok::Error;
 483     }
 484     TyVal = IntegerType::get(Context, NumBits);
 485     return lltok::Type;
 486   }
 487
 488   // Otherwise, this was a letter sequence.  See which keyword this is.
 489   if (!KeywordEnd) KeywordEnd = CurPtr;
 490   CurPtr = KeywordEnd;
 491   --StartChar;
 492   StringRef Keyword(StartChar, CurPtr - StartChar);
 493
 494 #define KEYWORD(STR)                                                           \
 495   do {                                                                         \
 496     if (Keyword == #STR)                                                       \
 497       return lltok::kw_##STR;                                                  \
 498   } while (false)
 499
 500   KEYWORD(true);    KEYWORD(false);
 501   KEYWORD(declare); KEYWORD(define);
 502   KEYWORD(global);  KEYWORD(constant);
 503
 504   KEYWORD(dso_local);
 505   KEYWORD(dso_preemptable);
 506
 507   KEYWORD(private);
 508   KEYWORD(internal);
 509   KEYWORD(available_externally);
 510   KEYWORD(linkonce);
 511   KEYWORD(linkonce_odr);
 512   KEYWORD(weak); // Use as a linkage, and a modifier for "cmpxchg".
 513   KEYWORD(weak_odr);
 514   KEYWORD(appending);
 515   KEYWORD(dllimport);
 516   KEYWORD(dllexport);
 517   KEYWORD(common);
 518   KEYWORD(default);
 519   KEYWORD(hidden);
 520   KEYWORD(protected);
 521   KEYWORD(unnamed_addr);
 522   KEYWORD(local_unnamed_addr);
 523   KEYWORD(externally_initialized);
 524   KEYWORD(extern_weak);
 525   KEYWORD(external);
 526   KEYWORD(thread_local);
 527   KEYWORD(localdynamic);
 528   KEYWORD(initialexec);
 529   KEYWORD(localexec);
 530   KEYWORD(zeroinitializer);
 531   KEYWORD(undef);
 532   KEYWORD(null);
 533   KEYWORD(none);
 534   KEYWORD(poison);
 535   KEYWORD(to);
 536   KEYWORD(caller);
 537   KEYWORD(within);
 538   KEYWORD(from);
 539   KEYWORD(tail);
 540   KEYWORD(musttail);
 541   KEYWORD(notail);
 542   KEYWORD(target);
 543   KEYWORD(triple);
 544   KEYWORD(source_filename);
 545   KEYWORD(unwind);
 546   KEYWORD(datalayout);
 547   KEYWORD(volatile);
 548   KEYWORD(atomic);
 549   KEYWORD(unordered);
 550   KEYWORD(monotonic);
 551   KEYWORD(acquire);
 552   KEYWORD(release);
 553   KEYWORD(acq_rel);
 554   KEYWORD(seq_cst);
 555   KEYWORD(syncscope);
 556
 557   KEYWORD(nnan);
 558   KEYWORD(ninf);
 559   KEYWORD(nsz);
 560   KEYWORD(arcp);
 561   KEYWORD(contract);
 562   KEYWORD(reassoc);
 563   KEYWORD(afn);
 564   KEYWORD(fast);
 565   KEYWORD(nuw);
 566   KEYWORD(nsw);
 567   KEYWORD(exact);
 568   KEYWORD(inbounds);
 569   KEYWORD(inrange);
 570   KEYWORD(align);
 571   KEYWORD(addrspace);
 572   KEYWORD(section);
 573   KEYWORD(partition);
 574   KEYWORD(alias);
 575   KEYWORD(ifunc);
 576   KEYWORD(module);
 577   KEYWORD(asm);
 578   KEYWORD(sideeffect);
 579   KEYWORD(alignstack);
 580   KEYWORD(inteldialect);
 581   KEYWORD(gc);
 582   KEYWORD(prefix);
 583   KEYWORD(prologue);
 584
 585   KEYWORD(ccc);
 586   KEYWORD(fastcc);
 587   KEYWORD(coldcc);
 588   KEYWORD(cfguard_checkcc);
 589   KEYWORD(x86_stdcallcc);
 590   KEYWORD(x86_fastcallcc);
 591   KEYWORD(x86_thiscallcc);
 592   KEYWORD(x86_vectorcallcc);
 593   KEYWORD(arm_apcscc);
 594   KEYWORD(arm_aapcscc);
 595   KEYWORD(arm_aapcs_vfpcc);
 596   KEYWORD(aarch64_vector_pcs);
 597   KEYWORD(aarch64_sve_vector_pcs);
 598   KEYWORD(msp430_intrcc);
 599   KEYWORD(avr_intrcc);
 600   KEYWORD(avr_signalcc);
 601   KEYWORD(ptx_kernel);
 602   KEYWORD(ptx_device);
 603   KEYWORD(spir_kernel);
 604   KEYWORD(spir_func);
 605   KEYWORD(intel_ocl_bicc);
 606   KEYWORD(x86_64_sysvcc);
 607   KEYWORD(win64cc);
 608   KEYWORD(x86_regcallcc);
 609   KEYWORD(webkit_jscc);
 610   KEYWORD(swiftcc);
 611   KEYWORD(swifttailcc);
 612   KEYWORD(anyregcc);
 613   KEYWORD(preserve_mostcc);
 614   KEYWORD(preserve_allcc);
 615   KEYWORD(ghccc);
 616   KEYWORD(x86_intrcc);
 617   KEYWORD(hhvmcc);
 618   KEYWORD(hhvm_ccc);
 619   KEYWORD(cxx_fast_tlscc);
 620   KEYWORD(amdgpu_vs);
 621   KEYWORD(amdgpu_ls);
 622   KEYWORD(amdgpu_hs);
 623   KEYWORD(amdgpu_es);
 624   KEYWORD(amdgpu_gs);
 625   KEYWORD(amdgpu_ps);
 626   KEYWORD(amdgpu_cs);
 627   KEYWORD(amdgpu_kernel);
 628   KEYWORD(amdgpu_gfx);
 629   KEYWORD(tailcc);
 630
 631   KEYWORD(cc);
 632   KEYWORD(c);
 633
 634   KEYWORD(attributes);
 635
 636   KEYWORD(alwaysinline);
 637   KEYWORD(allocsize);
 638   KEYWORD(argmemonly);
 639   KEYWORD(builtin);
 640   KEYWORD(byval);
 641   KEYWORD(inalloca);
 642   KEYWORD(cold);
 643   KEYWORD(convergent);
 644   KEYWORD(dereferenceable);
 645   KEYWORD(dereferenceable_or_null);
 646   KEYWORD(disable_sanitizer_instrumentation);
 647   KEYWORD(elementtype);
 648   KEYWORD(inaccessiblememonly);
 649   KEYWORD(inaccessiblemem_or_argmemonly);
 650   KEYWORD(inlinehint);
 651   KEYWORD(inreg);
 652   KEYWORD(jumptable);
 653   KEYWORD(minsize);
 654   KEYWORD(naked);
 655   KEYWORD(nest);
 656   KEYWORD(noalias);
 657   KEYWORD(nobuiltin);
 658   KEYWORD(nocallback);
 659   KEYWORD(nocapture);
 660   KEYWORD(noduplicate);
 661   KEYWORD(nofree);
 662   KEYWORD(noimplicitfloat);
 663   KEYWORD(noinline);
 664   KEYWORD(norecurse);
 665   KEYWORD(nonlazybind);
 666   KEYWORD(nomerge);
 667   KEYWORD(nonnull);
 668   KEYWORD(noprofile);
 669   KEYWORD(noredzone);
 670   KEYWORD(noreturn);
 671   KEYWORD(nosync);
 672   KEYWORD(nocf_check);
 673   KEYWORD(noundef);
 674   KEYWORD(nounwind);
 675   KEYWORD(nosanitize_coverage);
 676   KEYWORD(null_pointer_is_valid);
 677   KEYWORD(optforfuzzing);
 678   KEYWORD(optnone);
 679   KEYWORD(optsize);
 680   KEYWORD(preallocated);
 681   KEYWORD(readnone);
 682   KEYWORD(readonly);
 683   KEYWORD(returned);
 684   KEYWORD(returns_twice);
 685   KEYWORD(signext);
 686   KEYWORD(speculatable);
 687   KEYWORD(sret);
 688   KEYWORD(ssp);
 689   KEYWORD(sspreq);
 690   KEYWORD(sspstrong);
 691   KEYWORD(strictfp);
 692   KEYWORD(safestack);
 693   KEYWORD(shadowcallstack);
 694   KEYWORD(sanitize_address);
 695   KEYWORD(sanitize_hwaddress);
 696   KEYWORD(sanitize_memtag);
 697   KEYWORD(sanitize_thread);
 698   KEYWORD(sanitize_memory);
 699   KEYWORD(speculative_load_hardening);
 700   KEYWORD(swifterror);
 701   KEYWORD(swiftself);
 702   KEYWORD(swiftasync);
 703   KEYWORD(uwtable);
 704   KEYWORD(vscale_range);
 705   KEYWORD(willreturn);
 706   KEYWORD(writeonly);
 707   KEYWORD(zeroext);
 708   KEYWORD(immarg);
 709   KEYWORD(byref);
 710   KEYWORD(mustprogress);
 711
 712   KEYWORD(type);
 713   KEYWORD(opaque);
 714
 715   KEYWORD(comdat);
 716
 717   // Comdat types
 718   KEYWORD(any);
 719   KEYWORD(exactmatch);
 720   KEYWORD(largest);
 721   KEYWORD(nodeduplicate);
 722   KEYWORD(samesize);
 723
 724   KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
 725   KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);
 726   KEYWORD(oeq); KEYWORD(one); KEYWORD(olt); KEYWORD(ogt); KEYWORD(ole);
 727   KEYWORD(oge); KEYWORD(ord); KEYWORD(uno); KEYWORD(ueq); KEYWORD(une);
 728
 729   KEYWORD(xchg); KEYWORD(nand); KEYWORD(max); KEYWORD(min); KEYWORD(umax);
 730   KEYWORD(umin);
 731
 732   KEYWORD(vscale);
 733   KEYWORD(x);
 734   KEYWORD(blockaddress);
 735   KEYWORD(dso_local_equivalent);
 736
 737   // Metadata types.
 738   KEYWORD(distinct);
 739
 740   // Use-list order directives.
 741   KEYWORD(uselistorder);
 742   KEYWORD(uselistorder_bb);
 743
 744   KEYWORD(personality);
 745   KEYWORD(cleanup);
 746   KEYWORD(catch);
 747   KEYWORD(filter);
 748
 749   // Summary index keywords.
 750   KEYWORD(path);
 751   KEYWORD(hash);
 752   KEYWORD(gv);
 753   KEYWORD(guid);
 754   KEYWORD(name);
 755   KEYWORD(summaries);
 756   KEYWORD(flags);
 757   KEYWORD(blockcount);
 758   KEYWORD(linkage);
 759   KEYWORD(visibility);
 760   KEYWORD(notEligibleToImport);
 761   KEYWORD(live);
 762   KEYWORD(dsoLocal);
 763   KEYWORD(canAutoHide);
 764   KEYWORD(function);
 765   KEYWORD(insts);
 766   KEYWORD(funcFlags);
 767   KEYWORD(readNone);
 768   KEYWORD(readOnly);
 769   KEYWORD(noRecurse);
 770   KEYWORD(returnDoesNotAlias);
 771   KEYWORD(noInline);
 772   KEYWORD(alwaysInline);
 773   KEYWORD(calls);
 774   KEYWORD(callee);
 775   KEYWORD(params);
 776   KEYWORD(param);
 777   KEYWORD(hotness);
 778   KEYWORD(unknown);
 779   KEYWORD(hot);
 780   KEYWORD(critical);
 781   KEYWORD(relbf);
 782   KEYWORD(variable);
 783   KEYWORD(vTableFuncs);
 784   KEYWORD(virtFunc);
 785   KEYWORD(aliasee);
 786   KEYWORD(refs);
 787   KEYWORD(typeIdInfo);
 788   KEYWORD(typeTests);
 789   KEYWORD(typeTestAssumeVCalls);
 790   KEYWORD(typeCheckedLoadVCalls);
 791   KEYWORD(typeTestAssumeConstVCalls);
 792   KEYWORD(typeCheckedLoadConstVCalls);
 793   KEYWORD(vFuncId);
 794   KEYWORD(offset);
 795   KEYWORD(args);
 796   KEYWORD(typeid);
 797   KEYWORD(typeidCompatibleVTable);
 798   KEYWORD(summary);
 799   KEYWORD(typeTestRes);
 800   KEYWORD(kind);
 801   KEYWORD(unsat);
 802   KEYWORD(byteArray);
 803   KEYWORD(inline);
 804   KEYWORD(single);
 805   KEYWORD(allOnes);
 806   KEYWORD(sizeM1BitWidth);
 807   KEYWORD(alignLog2);
 808   KEYWORD(sizeM1);
 809   KEYWORD(bitMask);
 810   KEYWORD(inlineBits);
 811   KEYWORD(vcall_visibility);
 812   KEYWORD(wpdResolutions);
 813   KEYWORD(wpdRes);
 814   KEYWORD(indir);
 815   KEYWORD(singleImpl);
 816   KEYWORD(branchFunnel);
 817   KEYWORD(singleImplName);
 818   KEYWORD(resByArg);
 819   KEYWORD(byArg);
 820   KEYWORD(uniformRetVal);
 821   KEYWORD(uniqueRetVal);
 822   KEYWORD(virtualConstProp);
 823   KEYWORD(info);
 824   KEYWORD(byte);
 825   KEYWORD(bit);
 826   KEYWORD(varFlags);
 827
 828 #undef KEYWORD
 829
 830   // Keywords for types.
 831 #define TYPEKEYWORD(STR, LLVMTY)                                               \
 832   do {                                                                         \
 833     if (Keyword == STR) {                                                      \
 834       TyVal = LLVMTY;                                                          \
 835       return lltok::Type;                                                      \
 836     }                                                                          \
 837   } while (false)
 838
 839   TYPEKEYWORD("void",      Type::getVoidTy(Context));
 840   TYPEKEYWORD("half",      Type::getHalfTy(Context));
 841   TYPEKEYWORD("bfloat",    Type::getBFloatTy(Context));
 842   TYPEKEYWORD("float",     Type::getFloatTy(Context));
 843   TYPEKEYWORD("double",    Type::getDoubleTy(Context));
 844   TYPEKEYWORD("x86_fp80",  Type::getX86_FP80Ty(Context));
 845   TYPEKEYWORD("fp128",     Type::getFP128Ty(Context));
 846   TYPEKEYWORD("ppc_fp128", Type::getPPC_FP128Ty(Context));
 847   TYPEKEYWORD("label",     Type::getLabelTy(Context));
 848   TYPEKEYWORD("metadata",  Type::getMetadataTy(Context));
 849   TYPEKEYWORD("x86_mmx",   Type::getX86_MMXTy(Context));
 850   TYPEKEYWORD("x86_amx",   Type::getX86_AMXTy(Context));
 851   TYPEKEYWORD("token",     Type::getTokenTy(Context));
 852   TYPEKEYWORD("ptr", PointerType::getUnqual(Context));
 853
 854 #undef TYPEKEYWORD
 855
 856   // Keywords for instructions.
 857 #define INSTKEYWORD(STR, Enum)                                                 \
 858   do {                                                                         \
 859     if (Keyword == #STR) {                                                     \
 860       UIntVal = Instruction::Enum;                                             \
 861       return lltok::kw_##STR;                                                  \
 862     }                                                                          \
 863   } while (false)
 864
 865   INSTKEYWORD(fneg,  FNeg);
 866
 867   INSTKEYWORD(add,   Add);  INSTKEYWORD(fadd,   FAdd);
 868   INSTKEYWORD(sub,   Sub);  INSTKEYWORD(fsub,   FSub);
 869   INSTKEYWORD(mul,   Mul);  INSTKEYWORD(fmul,   FMul);
 870   INSTKEYWORD(udiv,  UDiv); INSTKEYWORD(sdiv,  SDiv); INSTKEYWORD(fdiv,  FDiv);
 871   INSTKEYWORD(urem,  URem); INSTKEYWORD(srem,  SRem); INSTKEYWORD(frem,  FRem);
 872   INSTKEYWORD(shl,   Shl);  INSTKEYWORD(lshr,  LShr); INSTKEYWORD(ashr,  AShr);
 873   INSTKEYWORD(and,   And);  INSTKEYWORD(or,    Or);   INSTKEYWORD(xor,   Xor);
 874   INSTKEYWORD(icmp,  ICmp); INSTKEYWORD(fcmp,  FCmp);
 875
 876   INSTKEYWORD(phi,         PHI);
 877   INSTKEYWORD(call,        Call);
 878   INSTKEYWORD(trunc,       Trunc);
 879   INSTKEYWORD(zext,        ZExt);
 880   INSTKEYWORD(sext,        SExt);
 881   INSTKEYWORD(fptrunc,     FPTrunc);
 882   INSTKEYWORD(fpext,       FPExt);
 883   INSTKEYWORD(uitofp,      UIToFP);
 884   INSTKEYWORD(sitofp,      SIToFP);
 885   INSTKEYWORD(fptoui,      FPToUI);
 886   INSTKEYWORD(fptosi,      FPToSI);
 887   INSTKEYWORD(inttoptr,    IntToPtr);
 888   INSTKEYWORD(ptrtoint,    PtrToInt);
 889   INSTKEYWORD(bitcast,     BitCast);
 890   INSTKEYWORD(addrspacecast, AddrSpaceCast);
 891   INSTKEYWORD(select,      Select);
 892   INSTKEYWORD(va_arg,      VAArg);
 893   INSTKEYWORD(ret,         Ret);
 894   INSTKEYWORD(br,          Br);
 895   INSTKEYWORD(switch,      Switch);
 896   INSTKEYWORD(indirectbr,  IndirectBr);
 897   INSTKEYWORD(invoke,      Invoke);
 898   INSTKEYWORD(resume,      Resume);
 899   INSTKEYWORD(unreachable, Unreachable);
 900   INSTKEYWORD(callbr,      CallBr);
 901
 902   INSTKEYWORD(alloca,      Alloca);
 903   INSTKEYWORD(load,        Load);
 904   INSTKEYWORD(store,       Store);
 905   INSTKEYWORD(cmpxchg,     AtomicCmpXchg);
 906   INSTKEYWORD(atomicrmw,   AtomicRMW);
 907   INSTKEYWORD(fence,       Fence);
 908   INSTKEYWORD(getelementptr, GetElementPtr);
 909
 910   INSTKEYWORD(extractelement, ExtractElement);
 911   INSTKEYWORD(insertelement,  InsertElement);
 912   INSTKEYWORD(shufflevector,  ShuffleVector);
 913   INSTKEYWORD(extractvalue,   ExtractValue);
 914   INSTKEYWORD(insertvalue,    InsertValue);
 915   INSTKEYWORD(landingpad,     LandingPad);
 916   INSTKEYWORD(cleanupret,     CleanupRet);
 917   INSTKEYWORD(catchret,       CatchRet);
 918   INSTKEYWORD(catchswitch,  CatchSwitch);
 919   INSTKEYWORD(catchpad,     CatchPad);
 920   INSTKEYWORD(cleanuppad,   CleanupPad);
 921
 922   INSTKEYWORD(freeze,       Freeze);
 923
 924 #undef INSTKEYWORD
 925
 926 #define DWKEYWORD(TYPE, TOKEN)                                                 \
 927   do {                                                                         \
 928     if (Keyword.startswith("DW_" #TYPE "_")) {                                 \
 929       StrVal.assign(Keyword.begin(), Keyword.end());                           \
 930       return lltok::TOKEN;                                                     \
 931     }                                                                          \
 932   } while (false)
 933
 934   DWKEYWORD(TAG, DwarfTag);
 935   DWKEYWORD(ATE, DwarfAttEncoding);
 936   DWKEYWORD(VIRTUALITY, DwarfVirtuality);
 937   DWKEYWORD(LANG, DwarfLang);
 938   DWKEYWORD(CC, DwarfCC);
 939   DWKEYWORD(OP, DwarfOp);
 940   DWKEYWORD(MACINFO, DwarfMacinfo);
 941
 942 #undef DWKEYWORD
 943
 944   if (Keyword.startswith("DIFlag")) {
 945     StrVal.assign(Keyword.begin(), Keyword.end());
 946     return lltok::DIFlag;
 947   }
 948
 949   if (Keyword.startswith("DISPFlag")) {
 950     StrVal.assign(Keyword.begin(), Keyword.end());
 951     return lltok::DISPFlag;
 952   }
 953
 954   if (Keyword.startswith("CSK_")) {
 955     StrVal.assign(Keyword.begin(), Keyword.end());
 956     return lltok::ChecksumKind;
 957   }
 958
 959   if (Keyword == "NoDebug" || Keyword == "FullDebug" ||
 960       Keyword == "LineTablesOnly" || Keyword == "DebugDirectivesOnly") {
 961     StrVal.assign(Keyword.begin(), Keyword.end());
 962     return lltok::EmissionKind;
 963   }
 964
 965   if (Keyword == "GNU" || Keyword == "None" || Keyword == "Default") {
 966     StrVal.assign(Keyword.begin(), Keyword.end());
 967     return lltok::NameTableKind;
 968   }
 969
 970   // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
 971   // the CFE to avoid forcing it to deal with 64-bit numbers.
 972   if ((TokStart[0] == 'u' || TokStart[0] == 's') &&
 973       TokStart[1] == '0' && TokStart[2] == 'x' &&
 974       isxdigit(static_cast<unsigned char>(TokStart[3]))) {
 975     int len = CurPtr-TokStart-3;
 976     uint32_t bits = len * 4;
 977     StringRef HexStr(TokStart + 3, len);
 978     if (!all_of(HexStr, isxdigit)) {
 979       // Bad token, return it as an error.
 980       CurPtr = TokStart+3;
 981       return lltok::Error;
 982     }
 983     APInt Tmp(bits, HexStr, 16);
 984     uint32_t activeBits = Tmp.getActiveBits();
 985     if (activeBits > 0 && activeBits < bits)
 986       Tmp = Tmp.trunc(activeBits);
 987     APSIntVal = APSInt(Tmp, TokStart[0] == 'u');
 988     return lltok::APSInt;
 989   }
 990
 991   // If this is "cc1234", return this as just "cc".
 992   if (TokStart[0] == 'c' && TokStart[1] == 'c') {
 993     CurPtr = TokStart+2;
 994     return lltok::kw_cc;
 995   }
 996
 997   // Finally, if this isn't known, return an error.
 998   CurPtr = TokStart+1;
 999   return lltok::Error;
1000 }
1001
1002 /// Lex all tokens that start with a 0x prefix, knowing they match and are not
1003 /// labels.
1004 ///    HexFPConstant     0x[0-9A-Fa-f]+
1005 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
1006 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
1007 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
1008 ///    HexHalfConstant   0xH[0-9A-Fa-f]+
1009 ///    HexBFloatConstant 0xR[0-9A-Fa-f]+
1010 lltok::Kind LLLexer::Lex0x() {
1011   CurPtr = TokStart + 2;
1012
1013   char Kind;
1014   if ((CurPtr[0] >= 'K' && CurPtr[0] <= 'M') || CurPtr[0] == 'H' ||
1015       CurPtr[0] == 'R') {
1016     Kind = *CurPtr++;
1017   } else {
1018     Kind = 'J';
1019   }
1020
1021   if (!isxdigit(static_cast<unsigned char>(CurPtr[0]))) {
1022     // Bad token, return it as an error.
1023     CurPtr = TokStart+1;
1024     return lltok::Error;
1025   }
1026
1027   while (isxdigit(static_cast<unsigned char>(CurPtr[0])))
1028     ++CurPtr;
1029
1030   if (Kind == 'J') {
1031     // HexFPConstant - Floating point constant represented in IEEE format as a
1032     // hexadecimal number for when exponential notation is not precise enough.
1033     // Half, BFloat, Float, and double only.
1034     APFloatVal = APFloat(APFloat::IEEEdouble(),
1035                          APInt(64, HexIntToVal(TokStart + 2, CurPtr)));
1036     return lltok::APFloat;
1037   }
1038
1039   uint64_t Pair[2];
1040   switch (Kind) {
1041   default: llvm_unreachable("Unknown kind!");
1042   case 'K':
1043     // F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
1044     FP80HexToIntPair(TokStart+3, CurPtr, Pair);
1045     APFloatVal = APFloat(APFloat::x87DoubleExtended(), APInt(80, Pair));
1046     return lltok::APFloat;
1047   case 'L':
1048     // F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
1049     HexToIntPair(TokStart+3, CurPtr, Pair);
1050     APFloatVal = APFloat(APFloat::IEEEquad(), APInt(128, Pair));
1051     return lltok::APFloat;
1052   case 'M':
1053     // PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
1054     HexToIntPair(TokStart+3, CurPtr, Pair);
1055     APFloatVal = APFloat(APFloat::PPCDoubleDouble(), APInt(128, Pair));
1056     return lltok::APFloat;
1057   case 'H':
1058     APFloatVal = APFloat(APFloat::IEEEhalf(),
1059                          APInt(16,HexIntToVal(TokStart+3, CurPtr)));
1060     return lltok::APFloat;
1061   case 'R':
1062     // Brain floating point
1063     APFloatVal = APFloat(APFloat::BFloat(),
1064                          APInt(16, HexIntToVal(TokStart + 3, CurPtr)));
1065     return lltok::APFloat;
1066   }
1067 }
1068
1069 /// Lex tokens for a label or a numeric constant, possibly starting with -.
1070 ///    Label             [-a-zA-Z$._0-9]+:
1071 ///    NInteger          -[0-9]+
1072 ///    FPConstant        [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
1073 ///    PInteger          [0-9]+
1074 ///    HexFPConstant     0x[0-9A-Fa-f]+
1075 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
1076 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
1077 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
1078 lltok::Kind LLLexer::LexDigitOrNegative() {
1079   // If the letter after the negative is not a number, this is probably a label.
1080   if (!isdigit(static_cast<unsigned char>(TokStart[0])) &&
1081       !isdigit(static_cast<unsigned char>(CurPtr[0]))) {
1082     // Okay, this is not a number after the -, it's probably a label.
1083     if (const char *End = isLabelTail(CurPtr)) {
1084       StrVal.assign(TokStart, End-1);
1085       CurPtr = End;
1086       return lltok::LabelStr;
1087     }
1088
1089     return lltok::Error;
1090   }
1091
1092   // At this point, it is either a label, int or fp constant.
1093
1094   // Skip digits, we have at least one.
1095   for (; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
1096     /*empty*/;
1097
1098   // Check if this is a fully-numeric label:
1099   if (isdigit(TokStart[0]) && CurPtr[0] == ':') {
1100     uint64_t Val = atoull(TokStart, CurPtr);
1101     ++CurPtr; // Skip the colon.
1102     if ((unsigned)Val != Val)
1103       Error("invalid value number (too large)!");
1104     UIntVal = unsigned(Val);
1105     return lltok::LabelID;
1106   }
1107
1108   // Check to see if this really is a string label, e.g. "-1:".
1109   if (isLabelChar(CurPtr[0]) || CurPtr[0] == ':') {
1110     if (const char *End = isLabelTail(CurPtr)) {
1111       StrVal.assign(TokStart, End-1);
1112       CurPtr = End;
1113       return lltok::LabelStr;
1114     }
1115   }
1116
1117   // If the next character is a '.', then it is a fp value, otherwise its
1118   // integer.
1119   if (CurPtr[0] != '.') {
1120     if (TokStart[0] == '0' && TokStart[1] == 'x')
1121       return Lex0x();
1122     APSIntVal = APSInt(StringRef(TokStart, CurPtr - TokStart));
1123     return lltok::APSInt;
1124   }
1125
1126   ++CurPtr;
1127
1128   // Skip over [0-9]*([eE][-+]?[0-9]+)?
1129   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1130
1131   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
1132     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
1133         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
1134           isdigit(static_cast<unsigned char>(CurPtr[2])))) {
1135       CurPtr += 2;
1136       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1137     }
1138   }
1139
1140   APFloatVal = APFloat(APFloat::IEEEdouble(),
1141                        StringRef(TokStart, CurPtr - TokStart));
1142   return lltok::APFloat;
1143 }
1144
1145 /// Lex a floating point constant starting with +.
1146 ///    FPConstant  [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
1147 lltok::Kind LLLexer::LexPositive() {
1148   // If the letter after the negative is a number, this is probably not a
1149   // label.
1150   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
1151     return lltok::Error;
1152
1153   // Skip digits.
1154   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
1155     /*empty*/;
1156
1157   // At this point, we need a '.'.
1158   if (CurPtr[0] != '.') {
1159     CurPtr = TokStart+1;
1160     return lltok::Error;
1161   }
1162
1163   ++CurPtr;
1164
1165   // Skip over [0-9]*([eE][-+]?[0-9]+)?
1166   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1167
1168   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
1169     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
1170         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
1171         isdigit(static_cast<unsigned char>(CurPtr[2])))) {
1172       CurPtr += 2;
1173       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1174     }
1175   }
1176
1177   APFloatVal = APFloat(APFloat::IEEEdouble(),
1178                        StringRef(TokStart, CurPtr - TokStart));
1179   return lltok::APFloat;
1180 }