lib/AsmParser/LLLexer.cpp

   1 //===- LLLexer.cpp - Lexer for .ll Files ----------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // Implement the Lexer for .ll files.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "LLLexer.h"
  15 #include "llvm/ADT/APInt.h"
  16 #include "llvm/ADT/STLExtras.h"
  17 #include "llvm/ADT/StringExtras.h"
  18 #include "llvm/ADT/Twine.h"
  19 #include "llvm/IR/DerivedTypes.h"
  20 #include "llvm/IR/Instruction.h"
  21 #include "llvm/Support/ErrorHandling.h"
  22 #include "llvm/Support/SourceMgr.h"
  23 #include <cassert>
  24 #include <cctype>
  25 #include <cstdio>
  26
  27 using namespace llvm;
  28
  29 bool LLLexer::Error(LocTy ErrorLoc, const Twine &Msg) const {
  30   ErrorInfo = SM.GetMessage(ErrorLoc, SourceMgr::DK_Error, Msg);
  31   return true;
  32 }
  33
  34 void LLLexer::Warning(LocTy WarningLoc, const Twine &Msg) const {
  35   SM.PrintMessage(WarningLoc, SourceMgr::DK_Warning, Msg);
  36 }
  37
  38 //===----------------------------------------------------------------------===//
  39 // Helper functions.
  40 //===----------------------------------------------------------------------===//
  41
  42 // atoull - Convert an ascii string of decimal digits into the unsigned long
  43 // long representation... this does not have to do input error checking,
  44 // because we know that the input will be matched by a suitable regex...
  45 //
  46 uint64_t LLLexer::atoull(const char *Buffer, const char *End) {
  47   uint64_t Result = 0;
  48   for (; Buffer != End; Buffer++) {
  49     uint64_t OldRes = Result;
  50     Result *= 10;
  51     Result += *Buffer-'0';
  52     if (Result < OldRes) {  // Uh, oh, overflow detected!!!
  53       Error("constant bigger than 64 bits detected!");
  54       return 0;
  55     }
  56   }
  57   return Result;
  58 }
  59
  60 uint64_t LLLexer::HexIntToVal(const char *Buffer, const char *End) {
  61   uint64_t Result = 0;
  62   for (; Buffer != End; ++Buffer) {
  63     uint64_t OldRes = Result;
  64     Result *= 16;
  65     Result += hexDigitValue(*Buffer);
  66
  67     if (Result < OldRes) {   // Uh, oh, overflow detected!!!
  68       Error("constant bigger than 64 bits detected!");
  69       return 0;
  70     }
  71   }
  72   return Result;
  73 }
  74
  75 void LLLexer::HexToIntPair(const char *Buffer, const char *End,
  76                            uint64_t Pair[2]) {
  77   Pair[0] = 0;
  78   if (End - Buffer >= 16) {
  79     for (int i = 0; i < 16; i++, Buffer++) {
  80       assert(Buffer != End);
  81       Pair[0] *= 16;
  82       Pair[0] += hexDigitValue(*Buffer);
  83     }
  84   }
  85   Pair[1] = 0;
  86   for (int i = 0; i < 16 && Buffer != End; i++, Buffer++) {
  87     Pair[1] *= 16;
  88     Pair[1] += hexDigitValue(*Buffer);
  89   }
  90   if (Buffer != End)
  91     Error("constant bigger than 128 bits detected!");
  92 }
  93
  94 /// FP80HexToIntPair - translate an 80 bit FP80 number (20 hexits) into
  95 /// { low64, high16 } as usual for an APInt.
  96 void LLLexer::FP80HexToIntPair(const char *Buffer, const char *End,
  97                            uint64_t Pair[2]) {
  98   Pair[1] = 0;
  99   for (int i=0; i<4 && Buffer != End; i++, Buffer++) {
 100     assert(Buffer != End);
 101     Pair[1] *= 16;
 102     Pair[1] += hexDigitValue(*Buffer);
 103   }
 104   Pair[0] = 0;
 105   for (int i = 0; i < 16 && Buffer != End; i++, Buffer++) {
 106     Pair[0] *= 16;
 107     Pair[0] += hexDigitValue(*Buffer);
 108   }
 109   if (Buffer != End)
 110     Error("constant bigger than 128 bits detected!");
 111 }
 112
 113 // UnEscapeLexed - Run through the specified buffer and change \xx codes to the
 114 // appropriate character.
 115 static void UnEscapeLexed(std::string &Str) {
 116   if (Str.empty()) return;
 117
 118   char *Buffer = &Str[0], *EndBuffer = Buffer+Str.size();
 119   char *BOut = Buffer;
 120   for (char *BIn = Buffer; BIn != EndBuffer; ) {
 121     if (BIn[0] == '\\') {
 122       if (BIn < EndBuffer-1 && BIn[1] == '\\') {
 123         *BOut++ = '\\'; // Two \ becomes one
 124         BIn += 2;
 125       } else if (BIn < EndBuffer-2 &&
 126                  isxdigit(static_cast<unsigned char>(BIn[1])) &&
 127                  isxdigit(static_cast<unsigned char>(BIn[2]))) {
 128         *BOut = hexDigitValue(BIn[1]) * 16 + hexDigitValue(BIn[2]);
 129         BIn += 3;                           // Skip over handled chars
 130         ++BOut;
 131       } else {
 132         *BOut++ = *BIn++;
 133       }
 134     } else {
 135       *BOut++ = *BIn++;
 136     }
 137   }
 138   Str.resize(BOut-Buffer);
 139 }
 140
 141 /// isLabelChar - Return true for [-a-zA-Z$._0-9].
 142 static bool isLabelChar(char C) {
 143   return isalnum(static_cast<unsigned char>(C)) || C == '-' || C == '$' ||
 144          C == '.' || C == '_';
 145 }
 146
 147 /// isLabelTail - Return true if this pointer points to a valid end of a label.
 148 static const char *isLabelTail(const char *CurPtr) {
 149   while (true) {
 150     if (CurPtr[0] == ':') return CurPtr+1;
 151     if (!isLabelChar(CurPtr[0])) return nullptr;
 152     ++CurPtr;
 153   }
 154 }
 155
 156 //===----------------------------------------------------------------------===//
 157 // Lexer definition.
 158 //===----------------------------------------------------------------------===//
 159
 160 LLLexer::LLLexer(StringRef StartBuf, SourceMgr &SM, SMDiagnostic &Err,
 161                  LLVMContext &C)
 162     : CurBuf(StartBuf), ErrorInfo(Err), SM(SM), Context(C), APFloatVal(0.0),
 163       IgnoreColonInIdentifiers(false) {
 164   CurPtr = CurBuf.begin();
 165 }
 166
 167 int LLLexer::getNextChar() {
 168   char CurChar = *CurPtr++;
 169   switch (CurChar) {
 170   default: return (unsigned char)CurChar;
 171   case 0:
 172     // A nul character in the stream is either the end of the current buffer or
 173     // a random nul in the file.  Disambiguate that here.
 174     if (CurPtr-1 != CurBuf.end())
 175       return 0;  // Just whitespace.
 176
 177     // Otherwise, return end of file.
 178     --CurPtr;  // Another call to lex will return EOF again.
 179     return EOF;
 180   }
 181 }
 182
 183 lltok::Kind LLLexer::LexToken() {
 184   while (true) {
 185     TokStart = CurPtr;
 186
 187     int CurChar = getNextChar();
 188     switch (CurChar) {
 189     default:
 190       // Handle letters: [a-zA-Z_]
 191       if (isalpha(static_cast<unsigned char>(CurChar)) || CurChar == '_')
 192         return LexIdentifier();
 193
 194       return lltok::Error;
 195     case EOF: return lltok::Eof;
 196     case 0:
 197     case ' ':
 198     case '\t':
 199     case '\n':
 200     case '\r':
 201       // Ignore whitespace.
 202       continue;
 203     case '+': return LexPositive();
 204     case '@': return LexAt();
 205     case '$': return LexDollar();
 206     case '%': return LexPercent();
 207     case '"': return LexQuote();
 208     case '.':
 209       if (const char *Ptr = isLabelTail(CurPtr)) {
 210         CurPtr = Ptr;
 211         StrVal.assign(TokStart, CurPtr-1);
 212         return lltok::LabelStr;
 213       }
 214       if (CurPtr[0] == '.' && CurPtr[1] == '.') {
 215         CurPtr += 2;
 216         return lltok::dotdotdot;
 217       }
 218       return lltok::Error;
 219     case ';':
 220       SkipLineComment();
 221       continue;
 222     case '!': return LexExclaim();
 223     case '^':
 224       return LexCaret();
 225     case ':':
 226       return lltok::colon;
 227     case '#': return LexHash();
 228     case '0': case '1': case '2': case '3': case '4':
 229     case '5': case '6': case '7': case '8': case '9':
 230     case '-':
 231       return LexDigitOrNegative();
 232     case '=': return lltok::equal;
 233     case '[': return lltok::lsquare;
 234     case ']': return lltok::rsquare;
 235     case '{': return lltok::lbrace;
 236     case '}': return lltok::rbrace;
 237     case '<': return lltok::less;
 238     case '>': return lltok::greater;
 239     case '(': return lltok::lparen;
 240     case ')': return lltok::rparen;
 241     case ',': return lltok::comma;
 242     case '*': return lltok::star;
 243     case '|': return lltok::bar;
 244     }
 245   }
 246 }
 247
 248 void LLLexer::SkipLineComment() {
 249   while (true) {
 250     if (CurPtr[0] == '\n' || CurPtr[0] == '\r' || getNextChar() == EOF)
 251       return;
 252   }
 253 }
 254
 255 /// Lex all tokens that start with an @ character.
 256 ///   GlobalVar   @\"[^\"]*\"
 257 ///   GlobalVar   @[-a-zA-Z$._][-a-zA-Z$._0-9]*
 258 ///   GlobalVarID @[0-9]+
 259 lltok::Kind LLLexer::LexAt() {
 260   return LexVar(lltok::GlobalVar, lltok::GlobalID);
 261 }
 262
 263 lltok::Kind LLLexer::LexDollar() {
 264   if (const char *Ptr = isLabelTail(TokStart)) {
 265     CurPtr = Ptr;
 266     StrVal.assign(TokStart, CurPtr - 1);
 267     return lltok::LabelStr;
 268   }
 269
 270   // Handle DollarStringConstant: $\"[^\"]*\"
 271   if (CurPtr[0] == '"') {
 272     ++CurPtr;
 273
 274     while (true) {
 275       int CurChar = getNextChar();
 276
 277       if (CurChar == EOF) {
 278         Error("end of file in COMDAT variable name");
 279         return lltok::Error;
 280       }
 281       if (CurChar == '"') {
 282         StrVal.assign(TokStart + 2, CurPtr - 1);
 283         UnEscapeLexed(StrVal);
 284         if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
 285           Error("Null bytes are not allowed in names");
 286           return lltok::Error;
 287         }
 288         return lltok::ComdatVar;
 289       }
 290     }
 291   }
 292
 293   // Handle ComdatVarName: $[-a-zA-Z$._][-a-zA-Z$._0-9]*
 294   if (ReadVarName())
 295     return lltok::ComdatVar;
 296
 297   return lltok::Error;
 298 }
 299
 300 /// ReadString - Read a string until the closing quote.
 301 lltok::Kind LLLexer::ReadString(lltok::Kind kind) {
 302   const char *Start = CurPtr;
 303   while (true) {
 304     int CurChar = getNextChar();
 305
 306     if (CurChar == EOF) {
 307       Error("end of file in string constant");
 308       return lltok::Error;
 309     }
 310     if (CurChar == '"') {
 311       StrVal.assign(Start, CurPtr-1);
 312       UnEscapeLexed(StrVal);
 313       return kind;
 314     }
 315   }
 316 }
 317
 318 /// ReadVarName - Read the rest of a token containing a variable name.
 319 bool LLLexer::ReadVarName() {
 320   const char *NameStart = CurPtr;
 321   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
 322       CurPtr[0] == '-' || CurPtr[0] == '$' ||
 323       CurPtr[0] == '.' || CurPtr[0] == '_') {
 324     ++CurPtr;
 325     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
 326            CurPtr[0] == '-' || CurPtr[0] == '$' ||
 327            CurPtr[0] == '.' || CurPtr[0] == '_')
 328       ++CurPtr;
 329
 330     StrVal.assign(NameStart, CurPtr);
 331     return true;
 332   }
 333   return false;
 334 }
 335
 336 // Lex an ID: [0-9]+. On success, the ID is stored in UIntVal and Token is
 337 // returned, otherwise the Error token is returned.
 338 lltok::Kind LLLexer::LexUIntID(lltok::Kind Token) {
 339   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
 340     return lltok::Error;
 341
 342   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
 343     /*empty*/;
 344
 345   uint64_t Val = atoull(TokStart + 1, CurPtr);
 346   if ((unsigned)Val != Val)
 347     Error("invalid value number (too large)!");
 348   UIntVal = unsigned(Val);
 349   return Token;
 350 }
 351
 352 lltok::Kind LLLexer::LexVar(lltok::Kind Var, lltok::Kind VarID) {
 353   // Handle StringConstant: \"[^\"]*\"
 354   if (CurPtr[0] == '"') {
 355     ++CurPtr;
 356
 357     while (true) {
 358       int CurChar = getNextChar();
 359
 360       if (CurChar == EOF) {
 361         Error("end of file in global variable name");
 362         return lltok::Error;
 363       }
 364       if (CurChar == '"') {
 365         StrVal.assign(TokStart+2, CurPtr-1);
 366         UnEscapeLexed(StrVal);
 367         if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
 368           Error("Null bytes are not allowed in names");
 369           return lltok::Error;
 370         }
 371         return Var;
 372       }
 373     }
 374   }
 375
 376   // Handle VarName: [-a-zA-Z$._][-a-zA-Z$._0-9]*
 377   if (ReadVarName())
 378     return Var;
 379
 380   // Handle VarID: [0-9]+
 381   return LexUIntID(VarID);
 382 }
 383
 384 /// Lex all tokens that start with a % character.
 385 ///   LocalVar   ::= %\"[^\"]*\"
 386 ///   LocalVar   ::= %[-a-zA-Z$._][-a-zA-Z$._0-9]*
 387 ///   LocalVarID ::= %[0-9]+
 388 lltok::Kind LLLexer::LexPercent() {
 389   return LexVar(lltok::LocalVar, lltok::LocalVarID);
 390 }
 391
 392 /// Lex all tokens that start with a " character.
 393 ///   QuoteLabel        "[^"]+":
 394 ///   StringConstant    "[^"]*"
 395 lltok::Kind LLLexer::LexQuote() {
 396   lltok::Kind kind = ReadString(lltok::StringConstant);
 397   if (kind == lltok::Error || kind == lltok::Eof)
 398     return kind;
 399
 400   if (CurPtr[0] == ':') {
 401     ++CurPtr;
 402     if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
 403       Error("Null bytes are not allowed in names");
 404       kind = lltok::Error;
 405     } else {
 406       kind = lltok::LabelStr;
 407     }
 408   }
 409
 410   return kind;
 411 }
 412
 413 /// Lex all tokens that start with a ! character.
 414 ///    !foo
 415 ///    !
 416 lltok::Kind LLLexer::LexExclaim() {
 417   // Lex a metadata name as a MetadataVar.
 418   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
 419       CurPtr[0] == '-' || CurPtr[0] == '$' ||
 420       CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\') {
 421     ++CurPtr;
 422     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
 423            CurPtr[0] == '-' || CurPtr[0] == '$' ||
 424            CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\')
 425       ++CurPtr;
 426
 427     StrVal.assign(TokStart+1, CurPtr);   // Skip !
 428     UnEscapeLexed(StrVal);
 429     return lltok::MetadataVar;
 430   }
 431   return lltok::exclaim;
 432 }
 433
 434 /// Lex all tokens that start with a ^ character.
 435 ///    SummaryID ::= ^[0-9]+
 436 lltok::Kind LLLexer::LexCaret() {
 437   // Handle SummaryID: ^[0-9]+
 438   return LexUIntID(lltok::SummaryID);
 439 }
 440
 441 /// Lex all tokens that start with a # character.
 442 ///    AttrGrpID ::= #[0-9]+
 443 lltok::Kind LLLexer::LexHash() {
 444   // Handle AttrGrpID: #[0-9]+
 445   return LexUIntID(lltok::AttrGrpID);
 446 }
 447
 448 /// Lex a label, integer type, keyword, or hexadecimal integer constant.
 449 ///    Label           [-a-zA-Z$._0-9]+:
 450 ///    IntegerType     i[0-9]+
 451 ///    Keyword         sdiv, float, ...
 452 ///    HexIntConstant  [us]0x[0-9A-Fa-f]+
 453 lltok::Kind LLLexer::LexIdentifier() {
 454   const char *StartChar = CurPtr;
 455   const char *IntEnd = CurPtr[-1] == 'i' ? nullptr : StartChar;
 456   const char *KeywordEnd = nullptr;
 457
 458   for (; isLabelChar(*CurPtr); ++CurPtr) {
 459     // If we decide this is an integer, remember the end of the sequence.
 460     if (!IntEnd && !isdigit(static_cast<unsigned char>(*CurPtr)))
 461       IntEnd = CurPtr;
 462     if (!KeywordEnd && !isalnum(static_cast<unsigned char>(*CurPtr)) &&
 463         *CurPtr != '_')
 464       KeywordEnd = CurPtr;
 465   }
 466
 467   // If we stopped due to a colon, unless we were directed to ignore it,
 468   // this really is a label.
 469   if (!IgnoreColonInIdentifiers && *CurPtr == ':') {
 470     StrVal.assign(StartChar-1, CurPtr++);
 471     return lltok::LabelStr;
 472   }
 473
 474   // Otherwise, this wasn't a label.  If this was valid as an integer type,
 475   // return it.
 476   if (!IntEnd) IntEnd = CurPtr;
 477   if (IntEnd != StartChar) {
 478     CurPtr = IntEnd;
 479     uint64_t NumBits = atoull(StartChar, CurPtr);
 480     if (NumBits < IntegerType::MIN_INT_BITS ||
 481         NumBits > IntegerType::MAX_INT_BITS) {
 482       Error("bitwidth for integer type out of range!");
 483       return lltok::Error;
 484     }
 485     TyVal = IntegerType::get(Context, NumBits);
 486     return lltok::Type;
 487   }
 488
 489   // Otherwise, this was a letter sequence.  See which keyword this is.
 490   if (!KeywordEnd) KeywordEnd = CurPtr;
 491   CurPtr = KeywordEnd;
 492   --StartChar;
 493   StringRef Keyword(StartChar, CurPtr - StartChar);
 494
 495 #define KEYWORD(STR)                                                           \
 496   do {                                                                         \
 497     if (Keyword == #STR)                                                       \
 498       return lltok::kw_##STR;                                                  \
 499   } while (false)
 500
 501   KEYWORD(true);    KEYWORD(false);
 502   KEYWORD(declare); KEYWORD(define);
 503   KEYWORD(global);  KEYWORD(constant);
 504
 505   KEYWORD(dso_local);
 506   KEYWORD(dso_preemptable);
 507
 508   KEYWORD(private);
 509   KEYWORD(internal);
 510   KEYWORD(available_externally);
 511   KEYWORD(linkonce);
 512   KEYWORD(linkonce_odr);
 513   KEYWORD(weak); // Use as a linkage, and a modifier for "cmpxchg".
 514   KEYWORD(weak_odr);
 515   KEYWORD(appending);
 516   KEYWORD(dllimport);
 517   KEYWORD(dllexport);
 518   KEYWORD(common);
 519   KEYWORD(default);
 520   KEYWORD(hidden);
 521   KEYWORD(protected);
 522   KEYWORD(unnamed_addr);
 523   KEYWORD(local_unnamed_addr);
 524   KEYWORD(externally_initialized);
 525   KEYWORD(extern_weak);
 526   KEYWORD(external);
 527   KEYWORD(thread_local);
 528   KEYWORD(localdynamic);
 529   KEYWORD(initialexec);
 530   KEYWORD(localexec);
 531   KEYWORD(zeroinitializer);
 532   KEYWORD(undef);
 533   KEYWORD(null);
 534   KEYWORD(none);
 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(deplibs);             // FIXME: Remove in 4.0.
 547   KEYWORD(datalayout);
 548   KEYWORD(volatile);
 549   KEYWORD(atomic);
 550   KEYWORD(unordered);
 551   KEYWORD(monotonic);
 552   KEYWORD(acquire);
 553   KEYWORD(release);
 554   KEYWORD(acq_rel);
 555   KEYWORD(seq_cst);
 556   KEYWORD(syncscope);
 557
 558   KEYWORD(nnan);
 559   KEYWORD(ninf);
 560   KEYWORD(nsz);
 561   KEYWORD(arcp);
 562   KEYWORD(contract);
 563   KEYWORD(reassoc);
 564   KEYWORD(afn);
 565   KEYWORD(fast);
 566   KEYWORD(nuw);
 567   KEYWORD(nsw);
 568   KEYWORD(exact);
 569   KEYWORD(inbounds);
 570   KEYWORD(inrange);
 571   KEYWORD(align);
 572   KEYWORD(addrspace);
 573   KEYWORD(section);
 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(x86_stdcallcc);
 589   KEYWORD(x86_fastcallcc);
 590   KEYWORD(x86_thiscallcc);
 591   KEYWORD(x86_vectorcallcc);
 592   KEYWORD(arm_apcscc);
 593   KEYWORD(arm_aapcscc);
 594   KEYWORD(arm_aapcs_vfpcc);
 595   KEYWORD(aarch64_vector_pcs);
 596   KEYWORD(msp430_intrcc);
 597   KEYWORD(avr_intrcc);
 598   KEYWORD(avr_signalcc);
 599   KEYWORD(ptx_kernel);
 600   KEYWORD(ptx_device);
 601   KEYWORD(spir_kernel);
 602   KEYWORD(spir_func);
 603   KEYWORD(intel_ocl_bicc);
 604   KEYWORD(x86_64_sysvcc);
 605   KEYWORD(win64cc);
 606   KEYWORD(x86_regcallcc);
 607   KEYWORD(webkit_jscc);
 608   KEYWORD(swiftcc);
 609   KEYWORD(anyregcc);
 610   KEYWORD(preserve_mostcc);
 611   KEYWORD(preserve_allcc);
 612   KEYWORD(ghccc);
 613   KEYWORD(x86_intrcc);
 614   KEYWORD(hhvmcc);
 615   KEYWORD(hhvm_ccc);
 616   KEYWORD(cxx_fast_tlscc);
 617   KEYWORD(amdgpu_vs);
 618   KEYWORD(amdgpu_ls);
 619   KEYWORD(amdgpu_hs);
 620   KEYWORD(amdgpu_es);
 621   KEYWORD(amdgpu_gs);
 622   KEYWORD(amdgpu_ps);
 623   KEYWORD(amdgpu_cs);
 624   KEYWORD(amdgpu_kernel);
 625
 626   KEYWORD(cc);
 627   KEYWORD(c);
 628
 629   KEYWORD(attributes);
 630
 631   KEYWORD(alwaysinline);
 632   KEYWORD(allocsize);
 633   KEYWORD(argmemonly);
 634   KEYWORD(builtin);
 635   KEYWORD(byval);
 636   KEYWORD(inalloca);
 637   KEYWORD(cold);
 638   KEYWORD(convergent);
 639   KEYWORD(dereferenceable);
 640   KEYWORD(dereferenceable_or_null);
 641   KEYWORD(inaccessiblememonly);
 642   KEYWORD(inaccessiblemem_or_argmemonly);
 643   KEYWORD(inlinehint);
 644   KEYWORD(inreg);
 645   KEYWORD(jumptable);
 646   KEYWORD(minsize);
 647   KEYWORD(naked);
 648   KEYWORD(nest);
 649   KEYWORD(noalias);
 650   KEYWORD(nobuiltin);
 651   KEYWORD(nocapture);
 652   KEYWORD(noduplicate);
 653   KEYWORD(noimplicitfloat);
 654   KEYWORD(noinline);
 655   KEYWORD(norecurse);
 656   KEYWORD(nonlazybind);
 657   KEYWORD(nonnull);
 658   KEYWORD(noredzone);
 659   KEYWORD(noreturn);
 660   KEYWORD(nocf_check);
 661   KEYWORD(nounwind);
 662   KEYWORD(optforfuzzing);
 663   KEYWORD(optnone);
 664   KEYWORD(optsize);
 665   KEYWORD(readnone);
 666   KEYWORD(readonly);
 667   KEYWORD(returned);
 668   KEYWORD(returns_twice);
 669   KEYWORD(signext);
 670   KEYWORD(speculatable);
 671   KEYWORD(sret);
 672   KEYWORD(ssp);
 673   KEYWORD(sspreq);
 674   KEYWORD(sspstrong);
 675   KEYWORD(strictfp);
 676   KEYWORD(safestack);
 677   KEYWORD(shadowcallstack);
 678   KEYWORD(sanitize_address);
 679   KEYWORD(sanitize_hwaddress);
 680   KEYWORD(sanitize_thread);
 681   KEYWORD(sanitize_memory);
 682   KEYWORD(speculative_load_hardening);
 683   KEYWORD(swifterror);
 684   KEYWORD(swiftself);
 685   KEYWORD(uwtable);
 686   KEYWORD(writeonly);
 687   KEYWORD(zeroext);
 688
 689   KEYWORD(type);
 690   KEYWORD(opaque);
 691
 692   KEYWORD(comdat);
 693
 694   // Comdat types
 695   KEYWORD(any);
 696   KEYWORD(exactmatch);
 697   KEYWORD(largest);
 698   KEYWORD(noduplicates);
 699   KEYWORD(samesize);
 700
 701   KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
 702   KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);
 703   KEYWORD(oeq); KEYWORD(one); KEYWORD(olt); KEYWORD(ogt); KEYWORD(ole);
 704   KEYWORD(oge); KEYWORD(ord); KEYWORD(uno); KEYWORD(ueq); KEYWORD(une);
 705
 706   KEYWORD(xchg); KEYWORD(nand); KEYWORD(max); KEYWORD(min); KEYWORD(umax);
 707   KEYWORD(umin);
 708
 709   KEYWORD(x);
 710   KEYWORD(blockaddress);
 711
 712   // Metadata types.
 713   KEYWORD(distinct);
 714
 715   // Use-list order directives.
 716   KEYWORD(uselistorder);
 717   KEYWORD(uselistorder_bb);
 718
 719   KEYWORD(personality);
 720   KEYWORD(cleanup);
 721   KEYWORD(catch);
 722   KEYWORD(filter);
 723
 724   // Summary index keywords.
 725   KEYWORD(path);
 726   KEYWORD(hash);
 727   KEYWORD(gv);
 728   KEYWORD(guid);
 729   KEYWORD(name);
 730   KEYWORD(summaries);
 731   KEYWORD(flags);
 732   KEYWORD(linkage);
 733   KEYWORD(notEligibleToImport);
 734   KEYWORD(live);
 735   KEYWORD(dsoLocal);
 736   KEYWORD(function);
 737   KEYWORD(insts);
 738   KEYWORD(funcFlags);
 739   KEYWORD(readNone);
 740   KEYWORD(readOnly);
 741   KEYWORD(noRecurse);
 742   KEYWORD(returnDoesNotAlias);
 743   KEYWORD(calls);
 744   KEYWORD(callee);
 745   KEYWORD(hotness);
 746   KEYWORD(unknown);
 747   KEYWORD(hot);
 748   KEYWORD(critical);
 749   KEYWORD(relbf);
 750   KEYWORD(variable);
 751   KEYWORD(aliasee);
 752   KEYWORD(refs);
 753   KEYWORD(typeIdInfo);
 754   KEYWORD(typeTests);
 755   KEYWORD(typeTestAssumeVCalls);
 756   KEYWORD(typeCheckedLoadVCalls);
 757   KEYWORD(typeTestAssumeConstVCalls);
 758   KEYWORD(typeCheckedLoadConstVCalls);
 759   KEYWORD(vFuncId);
 760   KEYWORD(offset);
 761   KEYWORD(args);
 762   KEYWORD(typeid);
 763   KEYWORD(summary);
 764   KEYWORD(typeTestRes);
 765   KEYWORD(kind);
 766   KEYWORD(unsat);
 767   KEYWORD(byteArray);
 768   KEYWORD(inline);
 769   KEYWORD(single);
 770   KEYWORD(allOnes);
 771   KEYWORD(sizeM1BitWidth);
 772   KEYWORD(alignLog2);
 773   KEYWORD(sizeM1);
 774   KEYWORD(bitMask);
 775   KEYWORD(inlineBits);
 776   KEYWORD(wpdResolutions);
 777   KEYWORD(wpdRes);
 778   KEYWORD(indir);
 779   KEYWORD(singleImpl);
 780   KEYWORD(branchFunnel);
 781   KEYWORD(singleImplName);
 782   KEYWORD(resByArg);
 783   KEYWORD(byArg);
 784   KEYWORD(uniformRetVal);
 785   KEYWORD(uniqueRetVal);
 786   KEYWORD(virtualConstProp);
 787   KEYWORD(info);
 788   KEYWORD(byte);
 789   KEYWORD(bit);
 790
 791 #undef KEYWORD
 792
 793   // Keywords for types.
 794 #define TYPEKEYWORD(STR, LLVMTY)                                               \
 795   do {                                                                         \
 796     if (Keyword == STR) {                                                      \
 797       TyVal = LLVMTY;                                                          \
 798       return lltok::Type;                                                      \
 799     }                                                                          \
 800   } while (false)
 801
 802   TYPEKEYWORD("void",      Type::getVoidTy(Context));
 803   TYPEKEYWORD("half",      Type::getHalfTy(Context));
 804   TYPEKEYWORD("float",     Type::getFloatTy(Context));
 805   TYPEKEYWORD("double",    Type::getDoubleTy(Context));
 806   TYPEKEYWORD("x86_fp80",  Type::getX86_FP80Ty(Context));
 807   TYPEKEYWORD("fp128",     Type::getFP128Ty(Context));
 808   TYPEKEYWORD("ppc_fp128", Type::getPPC_FP128Ty(Context));
 809   TYPEKEYWORD("label",     Type::getLabelTy(Context));
 810   TYPEKEYWORD("metadata",  Type::getMetadataTy(Context));
 811   TYPEKEYWORD("x86_mmx",   Type::getX86_MMXTy(Context));
 812   TYPEKEYWORD("token",     Type::getTokenTy(Context));
 813
 814 #undef TYPEKEYWORD
 815
 816   // Keywords for instructions.
 817 #define INSTKEYWORD(STR, Enum)                                                 \
 818   do {                                                                         \
 819     if (Keyword == #STR) {                                                     \
 820       UIntVal = Instruction::Enum;                                             \
 821       return lltok::kw_##STR;                                                  \
 822     }                                                                          \
 823   } while (false)
 824
 825   INSTKEYWORD(add,   Add);  INSTKEYWORD(fadd,   FAdd);
 826   INSTKEYWORD(sub,   Sub);  INSTKEYWORD(fsub,   FSub);
 827   INSTKEYWORD(mul,   Mul);  INSTKEYWORD(fmul,   FMul);
 828   INSTKEYWORD(udiv,  UDiv); INSTKEYWORD(sdiv,  SDiv); INSTKEYWORD(fdiv,  FDiv);
 829   INSTKEYWORD(urem,  URem); INSTKEYWORD(srem,  SRem); INSTKEYWORD(frem,  FRem);
 830   INSTKEYWORD(shl,   Shl);  INSTKEYWORD(lshr,  LShr); INSTKEYWORD(ashr,  AShr);
 831   INSTKEYWORD(and,   And);  INSTKEYWORD(or,    Or);   INSTKEYWORD(xor,   Xor);
 832   INSTKEYWORD(icmp,  ICmp); INSTKEYWORD(fcmp,  FCmp);
 833
 834   INSTKEYWORD(phi,         PHI);
 835   INSTKEYWORD(call,        Call);
 836   INSTKEYWORD(trunc,       Trunc);
 837   INSTKEYWORD(zext,        ZExt);
 838   INSTKEYWORD(sext,        SExt);
 839   INSTKEYWORD(fptrunc,     FPTrunc);
 840   INSTKEYWORD(fpext,       FPExt);
 841   INSTKEYWORD(uitofp,      UIToFP);
 842   INSTKEYWORD(sitofp,      SIToFP);
 843   INSTKEYWORD(fptoui,      FPToUI);
 844   INSTKEYWORD(fptosi,      FPToSI);
 845   INSTKEYWORD(inttoptr,    IntToPtr);
 846   INSTKEYWORD(ptrtoint,    PtrToInt);
 847   INSTKEYWORD(bitcast,     BitCast);
 848   INSTKEYWORD(addrspacecast, AddrSpaceCast);
 849   INSTKEYWORD(select,      Select);
 850   INSTKEYWORD(va_arg,      VAArg);
 851   INSTKEYWORD(ret,         Ret);
 852   INSTKEYWORD(br,          Br);
 853   INSTKEYWORD(switch,      Switch);
 854   INSTKEYWORD(indirectbr,  IndirectBr);
 855   INSTKEYWORD(invoke,      Invoke);
 856   INSTKEYWORD(resume,      Resume);
 857   INSTKEYWORD(unreachable, Unreachable);
 858
 859   INSTKEYWORD(alloca,      Alloca);
 860   INSTKEYWORD(load,        Load);
 861   INSTKEYWORD(store,       Store);
 862   INSTKEYWORD(cmpxchg,     AtomicCmpXchg);
 863   INSTKEYWORD(atomicrmw,   AtomicRMW);
 864   INSTKEYWORD(fence,       Fence);
 865   INSTKEYWORD(getelementptr, GetElementPtr);
 866
 867   INSTKEYWORD(extractelement, ExtractElement);
 868   INSTKEYWORD(insertelement,  InsertElement);
 869   INSTKEYWORD(shufflevector,  ShuffleVector);
 870   INSTKEYWORD(extractvalue,   ExtractValue);
 871   INSTKEYWORD(insertvalue,    InsertValue);
 872   INSTKEYWORD(landingpad,     LandingPad);
 873   INSTKEYWORD(cleanupret,     CleanupRet);
 874   INSTKEYWORD(catchret,       CatchRet);
 875   INSTKEYWORD(catchswitch,  CatchSwitch);
 876   INSTKEYWORD(catchpad,     CatchPad);
 877   INSTKEYWORD(cleanuppad,   CleanupPad);
 878
 879 #undef INSTKEYWORD
 880
 881 #define DWKEYWORD(TYPE, TOKEN)                                                 \
 882   do {                                                                         \
 883     if (Keyword.startswith("DW_" #TYPE "_")) {                                 \
 884       StrVal.assign(Keyword.begin(), Keyword.end());                           \
 885       return lltok::TOKEN;                                                     \
 886     }                                                                          \
 887   } while (false)
 888
 889   DWKEYWORD(TAG, DwarfTag);
 890   DWKEYWORD(ATE, DwarfAttEncoding);
 891   DWKEYWORD(VIRTUALITY, DwarfVirtuality);
 892   DWKEYWORD(LANG, DwarfLang);
 893   DWKEYWORD(CC, DwarfCC);
 894   DWKEYWORD(OP, DwarfOp);
 895   DWKEYWORD(MACINFO, DwarfMacinfo);
 896
 897 #undef DWKEYWORD
 898
 899   if (Keyword.startswith("DIFlag")) {
 900     StrVal.assign(Keyword.begin(), Keyword.end());
 901     return lltok::DIFlag;
 902   }
 903
 904   if (Keyword.startswith("CSK_")) {
 905     StrVal.assign(Keyword.begin(), Keyword.end());
 906     return lltok::ChecksumKind;
 907   }
 908
 909   if (Keyword == "NoDebug" || Keyword == "FullDebug" ||
 910       Keyword == "LineTablesOnly" || Keyword == "DebugDirectivesOnly") {
 911     StrVal.assign(Keyword.begin(), Keyword.end());
 912     return lltok::EmissionKind;
 913   }
 914
 915   if (Keyword == "GNU" || Keyword == "None" || Keyword == "Default") {
 916     StrVal.assign(Keyword.begin(), Keyword.end());
 917     return lltok::NameTableKind;
 918   }
 919
 920   // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
 921   // the CFE to avoid forcing it to deal with 64-bit numbers.
 922   if ((TokStart[0] == 'u' || TokStart[0] == 's') &&
 923       TokStart[1] == '0' && TokStart[2] == 'x' &&
 924       isxdigit(static_cast<unsigned char>(TokStart[3]))) {
 925     int len = CurPtr-TokStart-3;
 926     uint32_t bits = len * 4;
 927     StringRef HexStr(TokStart + 3, len);
 928     if (!all_of(HexStr, isxdigit)) {
 929       // Bad token, return it as an error.
 930       CurPtr = TokStart+3;
 931       return lltok::Error;
 932     }
 933     APInt Tmp(bits, HexStr, 16);
 934     uint32_t activeBits = Tmp.getActiveBits();
 935     if (activeBits > 0 && activeBits < bits)
 936       Tmp = Tmp.trunc(activeBits);
 937     APSIntVal = APSInt(Tmp, TokStart[0] == 'u');
 938     return lltok::APSInt;
 939   }
 940
 941   // If this is "cc1234", return this as just "cc".
 942   if (TokStart[0] == 'c' && TokStart[1] == 'c') {
 943     CurPtr = TokStart+2;
 944     return lltok::kw_cc;
 945   }
 946
 947   // Finally, if this isn't known, return an error.
 948   CurPtr = TokStart+1;
 949   return lltok::Error;
 950 }
 951
 952 /// Lex all tokens that start with a 0x prefix, knowing they match and are not
 953 /// labels.
 954 ///    HexFPConstant     0x[0-9A-Fa-f]+
 955 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
 956 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
 957 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
 958 ///    HexHalfConstant   0xH[0-9A-Fa-f]+
 959 lltok::Kind LLLexer::Lex0x() {
 960   CurPtr = TokStart + 2;
 961
 962   char Kind;
 963   if ((CurPtr[0] >= 'K' && CurPtr[0] <= 'M') || CurPtr[0] == 'H') {
 964     Kind = *CurPtr++;
 965   } else {
 966     Kind = 'J';
 967   }
 968
 969   if (!isxdigit(static_cast<unsigned char>(CurPtr[0]))) {
 970     // Bad token, return it as an error.
 971     CurPtr = TokStart+1;
 972     return lltok::Error;
 973   }
 974
 975   while (isxdigit(static_cast<unsigned char>(CurPtr[0])))
 976     ++CurPtr;
 977
 978   if (Kind == 'J') {
 979     // HexFPConstant - Floating point constant represented in IEEE format as a
 980     // hexadecimal number for when exponential notation is not precise enough.
 981     // Half, Float, and double only.
 982     APFloatVal = APFloat(APFloat::IEEEdouble(),
 983                          APInt(64, HexIntToVal(TokStart + 2, CurPtr)));
 984     return lltok::APFloat;
 985   }
 986
 987   uint64_t Pair[2];
 988   switch (Kind) {
 989   default: llvm_unreachable("Unknown kind!");
 990   case 'K':
 991     // F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
 992     FP80HexToIntPair(TokStart+3, CurPtr, Pair);
 993     APFloatVal = APFloat(APFloat::x87DoubleExtended(), APInt(80, Pair));
 994     return lltok::APFloat;
 995   case 'L':
 996     // F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
 997     HexToIntPair(TokStart+3, CurPtr, Pair);
 998     APFloatVal = APFloat(APFloat::IEEEquad(), APInt(128, Pair));
 999     return lltok::APFloat;
1000   case 'M':
1001     // PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
1002     HexToIntPair(TokStart+3, CurPtr, Pair);
1003     APFloatVal = APFloat(APFloat::PPCDoubleDouble(), APInt(128, Pair));
1004     return lltok::APFloat;
1005   case 'H':
1006     APFloatVal = APFloat(APFloat::IEEEhalf(),
1007                          APInt(16,HexIntToVal(TokStart+3, CurPtr)));
1008     return lltok::APFloat;
1009   }
1010 }
1011
1012 /// Lex tokens for a label or a numeric constant, possibly starting with -.
1013 ///    Label             [-a-zA-Z$._0-9]+:
1014 ///    NInteger          -[0-9]+
1015 ///    FPConstant        [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
1016 ///    PInteger          [0-9]+
1017 ///    HexFPConstant     0x[0-9A-Fa-f]+
1018 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
1019 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
1020 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
1021 lltok::Kind LLLexer::LexDigitOrNegative() {
1022   // If the letter after the negative is not a number, this is probably a label.
1023   if (!isdigit(static_cast<unsigned char>(TokStart[0])) &&
1024       !isdigit(static_cast<unsigned char>(CurPtr[0]))) {
1025     // Okay, this is not a number after the -, it's probably a label.
1026     if (const char *End = isLabelTail(CurPtr)) {
1027       StrVal.assign(TokStart, End-1);
1028       CurPtr = End;
1029       return lltok::LabelStr;
1030     }
1031
1032     return lltok::Error;
1033   }
1034
1035   // At this point, it is either a label, int or fp constant.
1036
1037   // Skip digits, we have at least one.
1038   for (; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
1039     /*empty*/;
1040
1041   // Check to see if this really is a label afterall, e.g. "-1:".
1042   if (isLabelChar(CurPtr[0]) || CurPtr[0] == ':') {
1043     if (const char *End = isLabelTail(CurPtr)) {
1044       StrVal.assign(TokStart, End-1);
1045       CurPtr = End;
1046       return lltok::LabelStr;
1047     }
1048   }
1049
1050   // If the next character is a '.', then it is a fp value, otherwise its
1051   // integer.
1052   if (CurPtr[0] != '.') {
1053     if (TokStart[0] == '0' && TokStart[1] == 'x')
1054       return Lex0x();
1055     APSIntVal = APSInt(StringRef(TokStart, CurPtr - TokStart));
1056     return lltok::APSInt;
1057   }
1058
1059   ++CurPtr;
1060
1061   // Skip over [0-9]*([eE][-+]?[0-9]+)?
1062   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1063
1064   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
1065     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
1066         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
1067           isdigit(static_cast<unsigned char>(CurPtr[2])))) {
1068       CurPtr += 2;
1069       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1070     }
1071   }
1072
1073   APFloatVal = APFloat(APFloat::IEEEdouble(),
1074                        StringRef(TokStart, CurPtr - TokStart));
1075   return lltok::APFloat;
1076 }
1077
1078 /// Lex a floating point constant starting with +.
1079 ///    FPConstant  [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
1080 lltok::Kind LLLexer::LexPositive() {
1081   // If the letter after the negative is a number, this is probably not a
1082   // label.
1083   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
1084     return lltok::Error;
1085
1086   // Skip digits.
1087   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
1088     /*empty*/;
1089
1090   // At this point, we need a '.'.
1091   if (CurPtr[0] != '.') {
1092     CurPtr = TokStart+1;
1093     return lltok::Error;
1094   }
1095
1096   ++CurPtr;
1097
1098   // Skip over [0-9]*([eE][-+]?[0-9]+)?
1099   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1100
1101   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
1102     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
1103         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
1104         isdigit(static_cast<unsigned char>(CurPtr[2])))) {
1105       CurPtr += 2;
1106       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1107     }
1108   }
1109
1110   APFloatVal = APFloat(APFloat::IEEEdouble(),
1111                        StringRef(TokStart, CurPtr - TokStart));
1112   return lltok::APFloat;
1113 }