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) {
 162   CurPtr = CurBuf.begin();
 163 }
 164
 165 int LLLexer::getNextChar() {
 166   char CurChar = *CurPtr++;
 167   switch (CurChar) {
 168   default: return (unsigned char)CurChar;
 169   case 0:
 170     // A nul character in the stream is either the end of the current buffer or
 171     // a random nul in the file.  Disambiguate that here.
 172     if (CurPtr-1 != CurBuf.end())
 173       return 0;  // Just whitespace.
 174
 175     // Otherwise, return end of file.
 176     --CurPtr;  // Another call to lex will return EOF again.
 177     return EOF;
 178   }
 179 }
 180
 181 lltok::Kind LLLexer::LexToken() {
 182   while (true) {
 183     TokStart = CurPtr;
 184
 185     int CurChar = getNextChar();
 186     switch (CurChar) {
 187     default:
 188       // Handle letters: [a-zA-Z_]
 189       if (isalpha(static_cast<unsigned char>(CurChar)) || CurChar == '_')
 190         return LexIdentifier();
 191
 192       return lltok::Error;
 193     case EOF: return lltok::Eof;
 194     case 0:
 195     case ' ':
 196     case '\t':
 197     case '\n':
 198     case '\r':
 199       // Ignore whitespace.
 200       continue;
 201     case '+': return LexPositive();
 202     case '@': return LexAt();
 203     case '$': return LexDollar();
 204     case '%': return LexPercent();
 205     case '"': return LexQuote();
 206     case '.':
 207       if (const char *Ptr = isLabelTail(CurPtr)) {
 208         CurPtr = Ptr;
 209         StrVal.assign(TokStart, CurPtr-1);
 210         return lltok::LabelStr;
 211       }
 212       if (CurPtr[0] == '.' && CurPtr[1] == '.') {
 213         CurPtr += 2;
 214         return lltok::dotdotdot;
 215       }
 216       return lltok::Error;
 217     case ';':
 218       SkipLineComment();
 219       continue;
 220     case '!': return LexExclaim();
 221     case '^':
 222       return LexCaret();
 223     case ':':
 224       return lltok::colon;
 225     case '#': return LexHash();
 226     case '0': case '1': case '2': case '3': case '4':
 227     case '5': case '6': case '7': case '8': case '9':
 228     case '-':
 229       return LexDigitOrNegative();
 230     case '=': return lltok::equal;
 231     case '[': return lltok::lsquare;
 232     case ']': return lltok::rsquare;
 233     case '{': return lltok::lbrace;
 234     case '}': return lltok::rbrace;
 235     case '<': return lltok::less;
 236     case '>': return lltok::greater;
 237     case '(': return lltok::lparen;
 238     case ')': return lltok::rparen;
 239     case ',': return lltok::comma;
 240     case '*': return lltok::star;
 241     case '|': return lltok::bar;
 242     }
 243   }
 244 }
 245
 246 void LLLexer::SkipLineComment() {
 247   while (true) {
 248     if (CurPtr[0] == '\n' || CurPtr[0] == '\r' || getNextChar() == EOF)
 249       return;
 250   }
 251 }
 252
 253 /// Lex all tokens that start with an @ character.
 254 ///   GlobalVar   @\"[^\"]*\"
 255 ///   GlobalVar   @[-a-zA-Z$._][-a-zA-Z$._0-9]*
 256 ///   GlobalVarID @[0-9]+
 257 lltok::Kind LLLexer::LexAt() {
 258   return LexVar(lltok::GlobalVar, lltok::GlobalID);
 259 }
 260
 261 lltok::Kind LLLexer::LexDollar() {
 262   if (const char *Ptr = isLabelTail(TokStart)) {
 263     CurPtr = Ptr;
 264     StrVal.assign(TokStart, CurPtr - 1);
 265     return lltok::LabelStr;
 266   }
 267
 268   // Handle DollarStringConstant: $\"[^\"]*\"
 269   if (CurPtr[0] == '"') {
 270     ++CurPtr;
 271
 272     while (true) {
 273       int CurChar = getNextChar();
 274
 275       if (CurChar == EOF) {
 276         Error("end of file in COMDAT variable name");
 277         return lltok::Error;
 278       }
 279       if (CurChar == '"') {
 280         StrVal.assign(TokStart + 2, CurPtr - 1);
 281         UnEscapeLexed(StrVal);
 282         if (StringRef(StrVal).contains(0)) {
 283           Error("Null bytes are not allowed in names");
 284           return lltok::Error;
 285         }
 286         return lltok::ComdatVar;
 287       }
 288     }
 289   }
 290
 291   // Handle ComdatVarName: $[-a-zA-Z$._][-a-zA-Z$._0-9]*
 292   if (ReadVarName())
 293     return lltok::ComdatVar;
 294
 295   return lltok::Error;
 296 }
 297
 298 /// ReadString - Read a string until the closing quote.
 299 lltok::Kind LLLexer::ReadString(lltok::Kind kind) {
 300   const char *Start = CurPtr;
 301   while (true) {
 302     int CurChar = getNextChar();
 303
 304     if (CurChar == EOF) {
 305       Error("end of file in string constant");
 306       return lltok::Error;
 307     }
 308     if (CurChar == '"') {
 309       StrVal.assign(Start, CurPtr-1);
 310       UnEscapeLexed(StrVal);
 311       return kind;
 312     }
 313   }
 314 }
 315
 316 /// ReadVarName - Read the rest of a token containing a variable name.
 317 bool LLLexer::ReadVarName() {
 318   const char *NameStart = CurPtr;
 319   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
 320       CurPtr[0] == '-' || CurPtr[0] == '$' ||
 321       CurPtr[0] == '.' || CurPtr[0] == '_') {
 322     ++CurPtr;
 323     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
 324            CurPtr[0] == '-' || CurPtr[0] == '$' ||
 325            CurPtr[0] == '.' || CurPtr[0] == '_')
 326       ++CurPtr;
 327
 328     StrVal.assign(NameStart, CurPtr);
 329     return true;
 330   }
 331   return false;
 332 }
 333
 334 // Lex an ID: [0-9]+. On success, the ID is stored in UIntVal and Token is
 335 // returned, otherwise the Error token is returned.
 336 lltok::Kind LLLexer::LexUIntID(lltok::Kind Token) {
 337   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
 338     return lltok::Error;
 339
 340   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
 341     /*empty*/;
 342
 343   uint64_t Val = atoull(TokStart + 1, CurPtr);
 344   if ((unsigned)Val != Val)
 345     Error("invalid value number (too large)!");
 346   UIntVal = unsigned(Val);
 347   return Token;
 348 }
 349
 350 lltok::Kind LLLexer::LexVar(lltok::Kind Var, lltok::Kind VarID) {
 351   // Handle StringConstant: \"[^\"]*\"
 352   if (CurPtr[0] == '"') {
 353     ++CurPtr;
 354
 355     while (true) {
 356       int CurChar = getNextChar();
 357
 358       if (CurChar == EOF) {
 359         Error("end of file in global variable name");
 360         return lltok::Error;
 361       }
 362       if (CurChar == '"') {
 363         StrVal.assign(TokStart+2, CurPtr-1);
 364         UnEscapeLexed(StrVal);
 365         if (StringRef(StrVal).contains(0)) {
 366           Error("Null bytes are not allowed in names");
 367           return lltok::Error;
 368         }
 369         return Var;
 370       }
 371     }
 372   }
 373
 374   // Handle VarName: [-a-zA-Z$._][-a-zA-Z$._0-9]*
 375   if (ReadVarName())
 376     return Var;
 377
 378   // Handle VarID: [0-9]+
 379   return LexUIntID(VarID);
 380 }
 381
 382 /// Lex all tokens that start with a % character.
 383 ///   LocalVar   ::= %\"[^\"]*\"
 384 ///   LocalVar   ::= %[-a-zA-Z$._][-a-zA-Z$._0-9]*
 385 ///   LocalVarID ::= %[0-9]+
 386 lltok::Kind LLLexer::LexPercent() {
 387   return LexVar(lltok::LocalVar, lltok::LocalVarID);
 388 }
 389
 390 /// Lex all tokens that start with a " character.
 391 ///   QuoteLabel        "[^"]+":
 392 ///   StringConstant    "[^"]*"
 393 lltok::Kind LLLexer::LexQuote() {
 394   lltok::Kind kind = ReadString(lltok::StringConstant);
 395   if (kind == lltok::Error || kind == lltok::Eof)
 396     return kind;
 397
 398   if (CurPtr[0] == ':') {
 399     ++CurPtr;
 400     if (StringRef(StrVal).contains(0)) {
 401       Error("Null bytes are not allowed in names");
 402       kind = lltok::Error;
 403     } else {
 404       kind = lltok::LabelStr;
 405     }
 406   }
 407
 408   return kind;
 409 }
 410
 411 /// Lex all tokens that start with a ! character.
 412 ///    !foo
 413 ///    !
 414 lltok::Kind LLLexer::LexExclaim() {
 415   // Lex a metadata name as a MetadataVar.
 416   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
 417       CurPtr[0] == '-' || CurPtr[0] == '$' ||
 418       CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\') {
 419     ++CurPtr;
 420     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
 421            CurPtr[0] == '-' || CurPtr[0] == '$' ||
 422            CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\')
 423       ++CurPtr;
 424
 425     StrVal.assign(TokStart+1, CurPtr);   // Skip !
 426     UnEscapeLexed(StrVal);
 427     return lltok::MetadataVar;
 428   }
 429   return lltok::exclaim;
 430 }
 431
 432 /// Lex all tokens that start with a ^ character.
 433 ///    SummaryID ::= ^[0-9]+
 434 lltok::Kind LLLexer::LexCaret() {
 435   // Handle SummaryID: ^[0-9]+
 436   return LexUIntID(lltok::SummaryID);
 437 }
 438
 439 /// Lex all tokens that start with a # character.
 440 ///    AttrGrpID ::= #[0-9]+
 441 lltok::Kind LLLexer::LexHash() {
 442   // Handle AttrGrpID: #[0-9]+
 443   return LexUIntID(lltok::AttrGrpID);
 444 }
 445
 446 /// Lex a label, integer type, keyword, or hexadecimal integer constant.
 447 ///    Label           [-a-zA-Z$._0-9]+:
 448 ///    IntegerType     i[0-9]+
 449 ///    Keyword         sdiv, float, ...
 450 ///    HexIntConstant  [us]0x[0-9A-Fa-f]+
 451 lltok::Kind LLLexer::LexIdentifier() {
 452   const char *StartChar = CurPtr;
 453   const char *IntEnd = CurPtr[-1] == 'i' ? nullptr : StartChar;
 454   const char *KeywordEnd = nullptr;
 455
 456   for (; isLabelChar(*CurPtr); ++CurPtr) {
 457     // If we decide this is an integer, remember the end of the sequence.
 458     if (!IntEnd && !isdigit(static_cast<unsigned char>(*CurPtr)))
 459       IntEnd = CurPtr;
 460     if (!KeywordEnd && !isalnum(static_cast<unsigned char>(*CurPtr)) &&
 461         *CurPtr != '_')
 462       KeywordEnd = CurPtr;
 463   }
 464
 465   // If we stopped due to a colon, unless we were directed to ignore it,
 466   // this really is a label.
 467   if (!IgnoreColonInIdentifiers && *CurPtr == ':') {
 468     StrVal.assign(StartChar-1, CurPtr++);
 469     return lltok::LabelStr;
 470   }
 471
 472   // Otherwise, this wasn't a label.  If this was valid as an integer type,
 473   // return it.
 474   if (!IntEnd) IntEnd = CurPtr;
 475   if (IntEnd != StartChar) {
 476     CurPtr = IntEnd;
 477     uint64_t NumBits = atoull(StartChar, CurPtr);
 478     if (NumBits < IntegerType::MIN_INT_BITS ||
 479         NumBits > IntegerType::MAX_INT_BITS) {
 480       Error("bitwidth for integer type out of range!");
 481       return lltok::Error;
 482     }
 483     TyVal = IntegerType::get(Context, NumBits);
 484     return lltok::Type;
 485   }
 486
 487   // Otherwise, this was a letter sequence.  See which keyword this is.
 488   if (!KeywordEnd) KeywordEnd = CurPtr;
 489   CurPtr = KeywordEnd;
 490   --StartChar;
 491   StringRef Keyword(StartChar, CurPtr - StartChar);
 492
 493 #define KEYWORD(STR)                                                           \
 494   do {                                                                         \
 495     if (Keyword == #STR)                                                       \
 496       return lltok::kw_##STR;                                                  \
 497   } while (false)
 498
 499   KEYWORD(true);    KEYWORD(false);
 500   KEYWORD(declare); KEYWORD(define);
 501   KEYWORD(global);  KEYWORD(constant);
 502
 503   KEYWORD(dso_local);
 504   KEYWORD(dso_preemptable);
 505
 506   KEYWORD(private);
 507   KEYWORD(internal);
 508   KEYWORD(available_externally);
 509   KEYWORD(linkonce);
 510   KEYWORD(linkonce_odr);
 511   KEYWORD(weak); // Use as a linkage, and a modifier for "cmpxchg".
 512   KEYWORD(weak_odr);
 513   KEYWORD(appending);
 514   KEYWORD(dllimport);
 515   KEYWORD(dllexport);
 516   KEYWORD(common);
 517   KEYWORD(default);
 518   KEYWORD(hidden);
 519   KEYWORD(protected);
 520   KEYWORD(unnamed_addr);
 521   KEYWORD(local_unnamed_addr);
 522   KEYWORD(externally_initialized);
 523   KEYWORD(extern_weak);
 524   KEYWORD(external);
 525   KEYWORD(thread_local);
 526   KEYWORD(localdynamic);
 527   KEYWORD(initialexec);
 528   KEYWORD(localexec);
 529   KEYWORD(zeroinitializer);
 530   KEYWORD(undef);
 531   KEYWORD(null);
 532   KEYWORD(none);
 533   KEYWORD(poison);
 534   KEYWORD(to);
 535   KEYWORD(caller);
 536   KEYWORD(within);
 537   KEYWORD(from);
 538   KEYWORD(tail);
 539   KEYWORD(musttail);
 540   KEYWORD(notail);
 541   KEYWORD(target);
 542   KEYWORD(triple);
 543   KEYWORD(source_filename);
 544   KEYWORD(unwind);
 545   KEYWORD(datalayout);
 546   KEYWORD(volatile);
 547   KEYWORD(atomic);
 548   KEYWORD(unordered);
 549   KEYWORD(monotonic);
 550   KEYWORD(acquire);
 551   KEYWORD(release);
 552   KEYWORD(acq_rel);
 553   KEYWORD(seq_cst);
 554   KEYWORD(syncscope);
 555
 556   KEYWORD(nnan);
 557   KEYWORD(ninf);
 558   KEYWORD(nsz);
 559   KEYWORD(arcp);
 560   KEYWORD(contract);
 561   KEYWORD(reassoc);
 562   KEYWORD(afn);
 563   KEYWORD(fast);
 564   KEYWORD(nuw);
 565   KEYWORD(nsw);
 566   KEYWORD(exact);
 567   KEYWORD(disjoint);
 568   KEYWORD(inbounds);
 569   KEYWORD(nneg);
 570   KEYWORD(inrange);
 571   KEYWORD(addrspace);
 572   KEYWORD(section);
 573   KEYWORD(partition);
 574   KEYWORD(code_model);
 575   KEYWORD(alias);
 576   KEYWORD(ifunc);
 577   KEYWORD(module);
 578   KEYWORD(asm);
 579   KEYWORD(sideeffect);
 580   KEYWORD(inteldialect);
 581   KEYWORD(gc);
 582   KEYWORD(prefix);
 583   KEYWORD(prologue);
 584
 585   KEYWORD(no_sanitize_address);
 586   KEYWORD(no_sanitize_hwaddress);
 587   KEYWORD(sanitize_address_dyninit);
 588
 589   KEYWORD(ccc);
 590   KEYWORD(fastcc);
 591   KEYWORD(coldcc);
 592   KEYWORD(cfguard_checkcc);
 593   KEYWORD(x86_stdcallcc);
 594   KEYWORD(x86_fastcallcc);
 595   KEYWORD(x86_thiscallcc);
 596   KEYWORD(x86_vectorcallcc);
 597   KEYWORD(arm_apcscc);
 598   KEYWORD(arm_aapcscc);
 599   KEYWORD(arm_aapcs_vfpcc);
 600   KEYWORD(aarch64_vector_pcs);
 601   KEYWORD(aarch64_sve_vector_pcs);
 602   KEYWORD(aarch64_sme_preservemost_from_x0);
 603   KEYWORD(aarch64_sme_preservemost_from_x2);
 604   KEYWORD(msp430_intrcc);
 605   KEYWORD(avr_intrcc);
 606   KEYWORD(avr_signalcc);
 607   KEYWORD(ptx_kernel);
 608   KEYWORD(ptx_device);
 609   KEYWORD(spir_kernel);
 610   KEYWORD(spir_func);
 611   KEYWORD(intel_ocl_bicc);
 612   KEYWORD(x86_64_sysvcc);
 613   KEYWORD(win64cc);
 614   KEYWORD(x86_regcallcc);
 615   KEYWORD(swiftcc);
 616   KEYWORD(swifttailcc);
 617   KEYWORD(anyregcc);
 618   KEYWORD(preserve_mostcc);
 619   KEYWORD(preserve_allcc);
 620   KEYWORD(ghccc);
 621   KEYWORD(x86_intrcc);
 622   KEYWORD(hhvmcc);
 623   KEYWORD(hhvm_ccc);
 624   KEYWORD(cxx_fast_tlscc);
 625   KEYWORD(amdgpu_vs);
 626   KEYWORD(amdgpu_ls);
 627   KEYWORD(amdgpu_hs);
 628   KEYWORD(amdgpu_es);
 629   KEYWORD(amdgpu_gs);
 630   KEYWORD(amdgpu_ps);
 631   KEYWORD(amdgpu_cs);
 632   KEYWORD(amdgpu_cs_chain);
 633   KEYWORD(amdgpu_cs_chain_preserve);
 634   KEYWORD(amdgpu_kernel);
 635   KEYWORD(amdgpu_gfx);
 636   KEYWORD(tailcc);
 637   KEYWORD(m68k_rtdcc);
 638   KEYWORD(graalcc);
 639
 640   KEYWORD(cc);
 641   KEYWORD(c);
 642
 643   KEYWORD(attributes);
 644   KEYWORD(sync);
 645   KEYWORD(async);
 646
 647 #define GET_ATTR_NAMES
 648 #define ATTRIBUTE_ENUM(ENUM_NAME, DISPLAY_NAME) \
 649   KEYWORD(DISPLAY_NAME);
 650 #include "llvm/IR/Attributes.inc"
 651
 652   KEYWORD(read);
 653   KEYWORD(write);
 654   KEYWORD(readwrite);
 655   KEYWORD(argmem);
 656   KEYWORD(inaccessiblemem);
 657   KEYWORD(argmemonly);
 658   KEYWORD(inaccessiblememonly);
 659   KEYWORD(inaccessiblemem_or_argmemonly);
 660
 661   // nofpclass attribute
 662   KEYWORD(all);
 663   KEYWORD(nan);
 664   KEYWORD(snan);
 665   KEYWORD(qnan);
 666   KEYWORD(inf);
 667   // ninf already a keyword
 668   KEYWORD(pinf);
 669   KEYWORD(norm);
 670   KEYWORD(nnorm);
 671   KEYWORD(pnorm);
 672   // sub already a keyword
 673   KEYWORD(nsub);
 674   KEYWORD(psub);
 675   KEYWORD(zero);
 676   KEYWORD(nzero);
 677   KEYWORD(pzero);
 678
 679   KEYWORD(type);
 680   KEYWORD(opaque);
 681
 682   KEYWORD(comdat);
 683
 684   // Comdat types
 685   KEYWORD(any);
 686   KEYWORD(exactmatch);
 687   KEYWORD(largest);
 688   KEYWORD(nodeduplicate);
 689   KEYWORD(samesize);
 690
 691   KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
 692   KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);
 693   KEYWORD(oeq); KEYWORD(one); KEYWORD(olt); KEYWORD(ogt); KEYWORD(ole);
 694   KEYWORD(oge); KEYWORD(ord); KEYWORD(uno); KEYWORD(ueq); KEYWORD(une);
 695
 696   KEYWORD(xchg); KEYWORD(nand); KEYWORD(max); KEYWORD(min); KEYWORD(umax);
 697   KEYWORD(umin); KEYWORD(fmax); KEYWORD(fmin);
 698   KEYWORD(uinc_wrap);
 699   KEYWORD(udec_wrap);
 700
 701   KEYWORD(splat);
 702   KEYWORD(vscale);
 703   KEYWORD(x);
 704   KEYWORD(blockaddress);
 705   KEYWORD(dso_local_equivalent);
 706   KEYWORD(no_cfi);
 707
 708   // Metadata types.
 709   KEYWORD(distinct);
 710
 711   // Use-list order directives.
 712   KEYWORD(uselistorder);
 713   KEYWORD(uselistorder_bb);
 714
 715   KEYWORD(personality);
 716   KEYWORD(cleanup);
 717   KEYWORD(catch);
 718   KEYWORD(filter);
 719
 720   // Summary index keywords.
 721   KEYWORD(path);
 722   KEYWORD(hash);
 723   KEYWORD(gv);
 724   KEYWORD(guid);
 725   KEYWORD(name);
 726   KEYWORD(summaries);
 727   KEYWORD(flags);
 728   KEYWORD(blockcount);
 729   KEYWORD(linkage);
 730   KEYWORD(visibility);
 731   KEYWORD(notEligibleToImport);
 732   KEYWORD(live);
 733   KEYWORD(dsoLocal);
 734   KEYWORD(canAutoHide);
 735   KEYWORD(function);
 736   KEYWORD(insts);
 737   KEYWORD(funcFlags);
 738   KEYWORD(readNone);
 739   KEYWORD(readOnly);
 740   KEYWORD(noRecurse);
 741   KEYWORD(returnDoesNotAlias);
 742   KEYWORD(noInline);
 743   KEYWORD(alwaysInline);
 744   KEYWORD(noUnwind);
 745   KEYWORD(mayThrow);
 746   KEYWORD(hasUnknownCall);
 747   KEYWORD(mustBeUnreachable);
 748   KEYWORD(calls);
 749   KEYWORD(callee);
 750   KEYWORD(params);
 751   KEYWORD(param);
 752   KEYWORD(hotness);
 753   KEYWORD(unknown);
 754   KEYWORD(critical);
 755   KEYWORD(relbf);
 756   KEYWORD(variable);
 757   KEYWORD(vTableFuncs);
 758   KEYWORD(virtFunc);
 759   KEYWORD(aliasee);
 760   KEYWORD(refs);
 761   KEYWORD(typeIdInfo);
 762   KEYWORD(typeTests);
 763   KEYWORD(typeTestAssumeVCalls);
 764   KEYWORD(typeCheckedLoadVCalls);
 765   KEYWORD(typeTestAssumeConstVCalls);
 766   KEYWORD(typeCheckedLoadConstVCalls);
 767   KEYWORD(vFuncId);
 768   KEYWORD(offset);
 769   KEYWORD(args);
 770   KEYWORD(typeid);
 771   KEYWORD(typeidCompatibleVTable);
 772   KEYWORD(summary);
 773   KEYWORD(typeTestRes);
 774   KEYWORD(kind);
 775   KEYWORD(unsat);
 776   KEYWORD(byteArray);
 777   KEYWORD(inline);
 778   KEYWORD(single);
 779   KEYWORD(allOnes);
 780   KEYWORD(sizeM1BitWidth);
 781   KEYWORD(alignLog2);
 782   KEYWORD(sizeM1);
 783   KEYWORD(bitMask);
 784   KEYWORD(inlineBits);
 785   KEYWORD(vcall_visibility);
 786   KEYWORD(wpdResolutions);
 787   KEYWORD(wpdRes);
 788   KEYWORD(indir);
 789   KEYWORD(singleImpl);
 790   KEYWORD(branchFunnel);
 791   KEYWORD(singleImplName);
 792   KEYWORD(resByArg);
 793   KEYWORD(byArg);
 794   KEYWORD(uniformRetVal);
 795   KEYWORD(uniqueRetVal);
 796   KEYWORD(virtualConstProp);
 797   KEYWORD(info);
 798   KEYWORD(byte);
 799   KEYWORD(bit);
 800   KEYWORD(varFlags);
 801   KEYWORD(callsites);
 802   KEYWORD(clones);
 803   KEYWORD(stackIds);
 804   KEYWORD(allocs);
 805   KEYWORD(versions);
 806   KEYWORD(memProf);
 807   KEYWORD(notcold);
 808
 809 #undef KEYWORD
 810
 811   // Keywords for types.
 812 #define TYPEKEYWORD(STR, LLVMTY)                                               \
 813   do {                                                                         \
 814     if (Keyword == STR) {                                                      \
 815       TyVal = LLVMTY;                                                          \
 816       return lltok::Type;                                                      \
 817     }                                                                          \
 818   } while (false)
 819
 820   TYPEKEYWORD("void",      Type::getVoidTy(Context));
 821   TYPEKEYWORD("half",      Type::getHalfTy(Context));
 822   TYPEKEYWORD("bfloat",    Type::getBFloatTy(Context));
 823   TYPEKEYWORD("float",     Type::getFloatTy(Context));
 824   TYPEKEYWORD("double",    Type::getDoubleTy(Context));
 825   TYPEKEYWORD("x86_fp80",  Type::getX86_FP80Ty(Context));
 826   TYPEKEYWORD("fp128",     Type::getFP128Ty(Context));
 827   TYPEKEYWORD("ppc_fp128", Type::getPPC_FP128Ty(Context));
 828   TYPEKEYWORD("label",     Type::getLabelTy(Context));
 829   TYPEKEYWORD("metadata",  Type::getMetadataTy(Context));
 830   TYPEKEYWORD("x86_mmx",   Type::getX86_MMXTy(Context));
 831   TYPEKEYWORD("x86_amx",   Type::getX86_AMXTy(Context));
 832   TYPEKEYWORD("token",     Type::getTokenTy(Context));
 833   TYPEKEYWORD("ptr",       PointerType::getUnqual(Context));
 834
 835 #undef TYPEKEYWORD
 836
 837   // Keywords for instructions.
 838 #define INSTKEYWORD(STR, Enum)                                                 \
 839   do {                                                                         \
 840     if (Keyword == #STR) {                                                     \
 841       UIntVal = Instruction::Enum;                                             \
 842       return lltok::kw_##STR;                                                  \
 843     }                                                                          \
 844   } while (false)
 845
 846   INSTKEYWORD(fneg,  FNeg);
 847
 848   INSTKEYWORD(add,   Add);  INSTKEYWORD(fadd,   FAdd);
 849   INSTKEYWORD(sub,   Sub);  INSTKEYWORD(fsub,   FSub);
 850   INSTKEYWORD(mul,   Mul);  INSTKEYWORD(fmul,   FMul);
 851   INSTKEYWORD(udiv,  UDiv); INSTKEYWORD(sdiv,  SDiv); INSTKEYWORD(fdiv,  FDiv);
 852   INSTKEYWORD(urem,  URem); INSTKEYWORD(srem,  SRem); INSTKEYWORD(frem,  FRem);
 853   INSTKEYWORD(shl,   Shl);  INSTKEYWORD(lshr,  LShr); INSTKEYWORD(ashr,  AShr);
 854   INSTKEYWORD(and,   And);  INSTKEYWORD(or,    Or);   INSTKEYWORD(xor,   Xor);
 855   INSTKEYWORD(icmp,  ICmp); INSTKEYWORD(fcmp,  FCmp);
 856
 857   INSTKEYWORD(phi,         PHI);
 858   INSTKEYWORD(call,        Call);
 859   INSTKEYWORD(trunc,       Trunc);
 860   INSTKEYWORD(zext,        ZExt);
 861   INSTKEYWORD(sext,        SExt);
 862   INSTKEYWORD(fptrunc,     FPTrunc);
 863   INSTKEYWORD(fpext,       FPExt);
 864   INSTKEYWORD(uitofp,      UIToFP);
 865   INSTKEYWORD(sitofp,      SIToFP);
 866   INSTKEYWORD(fptoui,      FPToUI);
 867   INSTKEYWORD(fptosi,      FPToSI);
 868   INSTKEYWORD(inttoptr,    IntToPtr);
 869   INSTKEYWORD(ptrtoint,    PtrToInt);
 870   INSTKEYWORD(bitcast,     BitCast);
 871   INSTKEYWORD(addrspacecast, AddrSpaceCast);
 872   INSTKEYWORD(select,      Select);
 873   INSTKEYWORD(va_arg,      VAArg);
 874   INSTKEYWORD(ret,         Ret);
 875   INSTKEYWORD(br,          Br);
 876   INSTKEYWORD(switch,      Switch);
 877   INSTKEYWORD(indirectbr,  IndirectBr);
 878   INSTKEYWORD(invoke,      Invoke);
 879   INSTKEYWORD(resume,      Resume);
 880   INSTKEYWORD(unreachable, Unreachable);
 881   INSTKEYWORD(callbr,      CallBr);
 882
 883   INSTKEYWORD(alloca,      Alloca);
 884   INSTKEYWORD(load,        Load);
 885   INSTKEYWORD(store,       Store);
 886   INSTKEYWORD(cmpxchg,     AtomicCmpXchg);
 887   INSTKEYWORD(atomicrmw,   AtomicRMW);
 888   INSTKEYWORD(fence,       Fence);
 889   INSTKEYWORD(getelementptr, GetElementPtr);
 890
 891   INSTKEYWORD(extractelement, ExtractElement);
 892   INSTKEYWORD(insertelement,  InsertElement);
 893   INSTKEYWORD(shufflevector,  ShuffleVector);
 894   INSTKEYWORD(extractvalue,   ExtractValue);
 895   INSTKEYWORD(insertvalue,    InsertValue);
 896   INSTKEYWORD(landingpad,     LandingPad);
 897   INSTKEYWORD(cleanupret,     CleanupRet);
 898   INSTKEYWORD(catchret,       CatchRet);
 899   INSTKEYWORD(catchswitch,  CatchSwitch);
 900   INSTKEYWORD(catchpad,     CatchPad);
 901   INSTKEYWORD(cleanuppad,   CleanupPad);
 902
 903   INSTKEYWORD(freeze,       Freeze);
 904
 905 #undef INSTKEYWORD
 906
 907 #define DWKEYWORD(TYPE, TOKEN)                                                 \
 908   do {                                                                         \
 909     if (Keyword.starts_with("DW_" #TYPE "_")) {                                \
 910       StrVal.assign(Keyword.begin(), Keyword.end());                           \
 911       return lltok::TOKEN;                                                     \
 912     }                                                                          \
 913   } while (false)
 914
 915   DWKEYWORD(TAG, DwarfTag);
 916   DWKEYWORD(ATE, DwarfAttEncoding);
 917   DWKEYWORD(VIRTUALITY, DwarfVirtuality);
 918   DWKEYWORD(LANG, DwarfLang);
 919   DWKEYWORD(CC, DwarfCC);
 920   DWKEYWORD(OP, DwarfOp);
 921   DWKEYWORD(MACINFO, DwarfMacinfo);
 922
 923 #undef DWKEYWORD
 924
 925   if (Keyword.starts_with("DIFlag")) {
 926     StrVal.assign(Keyword.begin(), Keyword.end());
 927     return lltok::DIFlag;
 928   }
 929
 930   if (Keyword.starts_with("DISPFlag")) {
 931     StrVal.assign(Keyword.begin(), Keyword.end());
 932     return lltok::DISPFlag;
 933   }
 934
 935   if (Keyword.starts_with("CSK_")) {
 936     StrVal.assign(Keyword.begin(), Keyword.end());
 937     return lltok::ChecksumKind;
 938   }
 939
 940   if (Keyword == "NoDebug" || Keyword == "FullDebug" ||
 941       Keyword == "LineTablesOnly" || Keyword == "DebugDirectivesOnly") {
 942     StrVal.assign(Keyword.begin(), Keyword.end());
 943     return lltok::EmissionKind;
 944   }
 945
 946   if (Keyword == "GNU" || Keyword == "Apple" || Keyword == "None" ||
 947       Keyword == "Default") {
 948     StrVal.assign(Keyword.begin(), Keyword.end());
 949     return lltok::NameTableKind;
 950   }
 951
 952   // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
 953   // the CFE to avoid forcing it to deal with 64-bit numbers.
 954   if ((TokStart[0] == 'u' || TokStart[0] == 's') &&
 955       TokStart[1] == '0' && TokStart[2] == 'x' &&
 956       isxdigit(static_cast<unsigned char>(TokStart[3]))) {
 957     int len = CurPtr-TokStart-3;
 958     uint32_t bits = len * 4;
 959     StringRef HexStr(TokStart + 3, len);
 960     if (!all_of(HexStr, isxdigit)) {
 961       // Bad token, return it as an error.
 962       CurPtr = TokStart+3;
 963       return lltok::Error;
 964     }
 965     APInt Tmp(bits, HexStr, 16);
 966     uint32_t activeBits = Tmp.getActiveBits();
 967     if (activeBits > 0 && activeBits < bits)
 968       Tmp = Tmp.trunc(activeBits);
 969     APSIntVal = APSInt(Tmp, TokStart[0] == 'u');
 970     return lltok::APSInt;
 971   }
 972
 973   // If this is "cc1234", return this as just "cc".
 974   if (TokStart[0] == 'c' && TokStart[1] == 'c') {
 975     CurPtr = TokStart+2;
 976     return lltok::kw_cc;
 977   }
 978
 979   // Finally, if this isn't known, return an error.
 980   CurPtr = TokStart+1;
 981   return lltok::Error;
 982 }
 983
 984 /// Lex all tokens that start with a 0x prefix, knowing they match and are not
 985 /// labels.
 986 ///    HexFPConstant     0x[0-9A-Fa-f]+
 987 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
 988 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
 989 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
 990 ///    HexHalfConstant   0xH[0-9A-Fa-f]+
 991 ///    HexBFloatConstant 0xR[0-9A-Fa-f]+
 992 lltok::Kind LLLexer::Lex0x() {
 993   CurPtr = TokStart + 2;
 994
 995   char Kind;
 996   if ((CurPtr[0] >= 'K' && CurPtr[0] <= 'M') || CurPtr[0] == 'H' ||
 997       CurPtr[0] == 'R') {
 998     Kind = *CurPtr++;
 999   } else {
1000     Kind = 'J';
1001   }
1002
1003   if (!isxdigit(static_cast<unsigned char>(CurPtr[0]))) {
1004     // Bad token, return it as an error.
1005     CurPtr = TokStart+1;
1006     return lltok::Error;
1007   }
1008
1009   while (isxdigit(static_cast<unsigned char>(CurPtr[0])))
1010     ++CurPtr;
1011
1012   if (Kind == 'J') {
1013     // HexFPConstant - Floating point constant represented in IEEE format as a
1014     // hexadecimal number for when exponential notation is not precise enough.
1015     // Half, BFloat, Float, and double only.
1016     APFloatVal = APFloat(APFloat::IEEEdouble(),
1017                          APInt(64, HexIntToVal(TokStart + 2, CurPtr)));
1018     return lltok::APFloat;
1019   }
1020
1021   uint64_t Pair[2];
1022   switch (Kind) {
1023   default: llvm_unreachable("Unknown kind!");
1024   case 'K':
1025     // F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
1026     FP80HexToIntPair(TokStart+3, CurPtr, Pair);
1027     APFloatVal = APFloat(APFloat::x87DoubleExtended(), APInt(80, Pair));
1028     return lltok::APFloat;
1029   case 'L':
1030     // F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
1031     HexToIntPair(TokStart+3, CurPtr, Pair);
1032     APFloatVal = APFloat(APFloat::IEEEquad(), APInt(128, Pair));
1033     return lltok::APFloat;
1034   case 'M':
1035     // PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
1036     HexToIntPair(TokStart+3, CurPtr, Pair);
1037     APFloatVal = APFloat(APFloat::PPCDoubleDouble(), APInt(128, Pair));
1038     return lltok::APFloat;
1039   case 'H':
1040     APFloatVal = APFloat(APFloat::IEEEhalf(),
1041                          APInt(16,HexIntToVal(TokStart+3, CurPtr)));
1042     return lltok::APFloat;
1043   case 'R':
1044     // Brain floating point
1045     APFloatVal = APFloat(APFloat::BFloat(),
1046                          APInt(16, HexIntToVal(TokStart + 3, CurPtr)));
1047     return lltok::APFloat;
1048   }
1049 }
1050
1051 /// Lex tokens for a label or a numeric constant, possibly starting with -.
1052 ///    Label             [-a-zA-Z$._0-9]+:
1053 ///    NInteger          -[0-9]+
1054 ///    FPConstant        [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
1055 ///    PInteger          [0-9]+
1056 ///    HexFPConstant     0x[0-9A-Fa-f]+
1057 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
1058 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
1059 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
1060 lltok::Kind LLLexer::LexDigitOrNegative() {
1061   // If the letter after the negative is not a number, this is probably a label.
1062   if (!isdigit(static_cast<unsigned char>(TokStart[0])) &&
1063       !isdigit(static_cast<unsigned char>(CurPtr[0]))) {
1064     // Okay, this is not a number after the -, it's probably a label.
1065     if (const char *End = isLabelTail(CurPtr)) {
1066       StrVal.assign(TokStart, End-1);
1067       CurPtr = End;
1068       return lltok::LabelStr;
1069     }
1070
1071     return lltok::Error;
1072   }
1073
1074   // At this point, it is either a label, int or fp constant.
1075
1076   // Skip digits, we have at least one.
1077   for (; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
1078     /*empty*/;
1079
1080   // Check if this is a fully-numeric label:
1081   if (isdigit(TokStart[0]) && CurPtr[0] == ':') {
1082     uint64_t Val = atoull(TokStart, CurPtr);
1083     ++CurPtr; // Skip the colon.
1084     if ((unsigned)Val != Val)
1085       Error("invalid value number (too large)!");
1086     UIntVal = unsigned(Val);
1087     return lltok::LabelID;
1088   }
1089
1090   // Check to see if this really is a string label, e.g. "-1:".
1091   if (isLabelChar(CurPtr[0]) || CurPtr[0] == ':') {
1092     if (const char *End = isLabelTail(CurPtr)) {
1093       StrVal.assign(TokStart, End-1);
1094       CurPtr = End;
1095       return lltok::LabelStr;
1096     }
1097   }
1098
1099   // If the next character is a '.', then it is a fp value, otherwise its
1100   // integer.
1101   if (CurPtr[0] != '.') {
1102     if (TokStart[0] == '0' && TokStart[1] == 'x')
1103       return Lex0x();
1104     APSIntVal = APSInt(StringRef(TokStart, CurPtr - TokStart));
1105     return lltok::APSInt;
1106   }
1107
1108   ++CurPtr;
1109
1110   // Skip over [0-9]*([eE][-+]?[0-9]+)?
1111   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1112
1113   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
1114     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
1115         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
1116           isdigit(static_cast<unsigned char>(CurPtr[2])))) {
1117       CurPtr += 2;
1118       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1119     }
1120   }
1121
1122   APFloatVal = APFloat(APFloat::IEEEdouble(),
1123                        StringRef(TokStart, CurPtr - TokStart));
1124   return lltok::APFloat;
1125 }
1126
1127 /// Lex a floating point constant starting with +.
1128 ///    FPConstant  [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
1129 lltok::Kind LLLexer::LexPositive() {
1130   // If the letter after the negative is a number, this is probably not a
1131   // label.
1132   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
1133     return lltok::Error;
1134
1135   // Skip digits.
1136   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
1137     /*empty*/;
1138
1139   // At this point, we need a '.'.
1140   if (CurPtr[0] != '.') {
1141     CurPtr = TokStart+1;
1142     return lltok::Error;
1143   }
1144
1145   ++CurPtr;
1146
1147   // Skip over [0-9]*([eE][-+]?[0-9]+)?
1148   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1149
1150   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
1151     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
1152         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
1153         isdigit(static_cast<unsigned char>(CurPtr[2])))) {
1154       CurPtr += 2;
1155       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1156     }
1157   }
1158
1159   APFloatVal = APFloat(APFloat::IEEEdouble(),
1160                        StringRef(TokStart, CurPtr - TokStart));
1161   return lltok::APFloat;
1162 }