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   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   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     return LexToken();
201   case '+': return LexPositive();
202   case '@': return LexAt();
203   case '$': return LexDollar();
204   case '%': return LexPercent();
205   case '"': return LexQuote();
206   case '.':
207     if (const char *Ptr = isLabelTail(CurPtr)) {
208       CurPtr = Ptr;
209       StrVal.assign(TokStart, CurPtr-1);
210       return lltok::LabelStr;
211     }
212     if (CurPtr[0] == '.' && CurPtr[1] == '.') {
213       CurPtr += 2;
214       return lltok::dotdotdot;
215     }
216     return lltok::Error;
217   case ';':
218     SkipLineComment();
219     return LexToken();
220   case '!': return LexExclaim();
221   case '#': return LexHash();
222   case '0': case '1': case '2': case '3': case '4':
223   case '5': case '6': case '7': case '8': case '9':
224   case '-':
225     return LexDigitOrNegative();
226   case '=': return lltok::equal;
227   case '[': return lltok::lsquare;
228   case ']': return lltok::rsquare;
229   case '{': return lltok::lbrace;
230   case '}': return lltok::rbrace;
231   case '<': return lltok::less;
232   case '>': return lltok::greater;
233   case '(': return lltok::lparen;
234   case ')': return lltok::rparen;
235   case ',': return lltok::comma;
236   case '*': return lltok::star;
237   case '|': return lltok::bar;
238   }
239 }
240 
241 void LLLexer::SkipLineComment() {
242   while (true) {
243     if (CurPtr[0] == '\n' || CurPtr[0] == '\r' || getNextChar() == EOF)
244       return;
245   }
246 }
247 
248 /// Lex all tokens that start with an @ character.
249 ///   GlobalVar   @\"[^\"]*\"
250 ///   GlobalVar   @[-a-zA-Z$._][-a-zA-Z$._0-9]*
251 ///   GlobalVarID @[0-9]+
252 lltok::Kind LLLexer::LexAt() {
253   return LexVar(lltok::GlobalVar, lltok::GlobalID);
254 }
255 
256 lltok::Kind LLLexer::LexDollar() {
257   if (const char *Ptr = isLabelTail(TokStart)) {
258     CurPtr = Ptr;
259     StrVal.assign(TokStart, CurPtr - 1);
260     return lltok::LabelStr;
261   }
262 
263   // Handle DollarStringConstant: $\"[^\"]*\"
264   if (CurPtr[0] == '"') {
265     ++CurPtr;
266 
267     while (true) {
268       int CurChar = getNextChar();
269 
270       if (CurChar == EOF) {
271         Error("end of file in COMDAT variable name");
272         return lltok::Error;
273       }
274       if (CurChar == '"') {
275         StrVal.assign(TokStart + 2, CurPtr - 1);
276         UnEscapeLexed(StrVal);
277         if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
278           Error("Null bytes are not allowed in names");
279           return lltok::Error;
280         }
281         return lltok::ComdatVar;
282       }
283     }
284   }
285 
286   // Handle ComdatVarName: $[-a-zA-Z$._][-a-zA-Z$._0-9]*
287   if (ReadVarName())
288     return lltok::ComdatVar;
289 
290   return lltok::Error;
291 }
292 
293 /// ReadString - Read a string until the closing quote.
294 lltok::Kind LLLexer::ReadString(lltok::Kind kind) {
295   const char *Start = CurPtr;
296   while (true) {
297     int CurChar = getNextChar();
298 
299     if (CurChar == EOF) {
300       Error("end of file in string constant");
301       return lltok::Error;
302     }
303     if (CurChar == '"') {
304       StrVal.assign(Start, CurPtr-1);
305       UnEscapeLexed(StrVal);
306       return kind;
307     }
308   }
309 }
310 
311 /// ReadVarName - Read the rest of a token containing a variable name.
312 bool LLLexer::ReadVarName() {
313   const char *NameStart = CurPtr;
314   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
315       CurPtr[0] == '-' || CurPtr[0] == '$' ||
316       CurPtr[0] == '.' || CurPtr[0] == '_') {
317     ++CurPtr;
318     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
319            CurPtr[0] == '-' || CurPtr[0] == '$' ||
320            CurPtr[0] == '.' || CurPtr[0] == '_')
321       ++CurPtr;
322 
323     StrVal.assign(NameStart, CurPtr);
324     return true;
325   }
326   return false;
327 }
328 
329 lltok::Kind LLLexer::LexVar(lltok::Kind Var, lltok::Kind VarID) {
330   // Handle StringConstant: \"[^\"]*\"
331   if (CurPtr[0] == '"') {
332     ++CurPtr;
333 
334     while (true) {
335       int CurChar = getNextChar();
336 
337       if (CurChar == EOF) {
338         Error("end of file in global variable name");
339         return lltok::Error;
340       }
341       if (CurChar == '"') {
342         StrVal.assign(TokStart+2, CurPtr-1);
343         UnEscapeLexed(StrVal);
344         if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
345           Error("Null bytes are not allowed in names");
346           return lltok::Error;
347         }
348         return Var;
349       }
350     }
351   }
352 
353   // Handle VarName: [-a-zA-Z$._][-a-zA-Z$._0-9]*
354   if (ReadVarName())
355     return Var;
356 
357   // Handle VarID: [0-9]+
358   if (isdigit(static_cast<unsigned char>(CurPtr[0]))) {
359     for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
360       /*empty*/;
361 
362     uint64_t Val = atoull(TokStart+1, CurPtr);
363     if ((unsigned)Val != Val)
364       Error("invalid value number (too large)!");
365     UIntVal = unsigned(Val);
366     return VarID;
367   }
368   return lltok::Error;
369 }
370 
371 /// Lex all tokens that start with a % character.
372 ///   LocalVar   ::= %\"[^\"]*\"
373 ///   LocalVar   ::= %[-a-zA-Z$._][-a-zA-Z$._0-9]*
374 ///   LocalVarID ::= %[0-9]+
375 lltok::Kind LLLexer::LexPercent() {
376   return LexVar(lltok::LocalVar, lltok::LocalVarID);
377 }
378 
379 /// Lex all tokens that start with a " character.
380 ///   QuoteLabel        "[^"]+":
381 ///   StringConstant    "[^"]*"
382 lltok::Kind LLLexer::LexQuote() {
383   lltok::Kind kind = ReadString(lltok::StringConstant);
384   if (kind == lltok::Error || kind == lltok::Eof)
385     return kind;
386 
387   if (CurPtr[0] == ':') {
388     ++CurPtr;
389     if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
390       Error("Null bytes are not allowed in names");
391       kind = lltok::Error;
392     } else {
393       kind = lltok::LabelStr;
394     }
395   }
396 
397   return kind;
398 }
399 
400 /// Lex all tokens that start with a ! character.
401 ///    !foo
402 ///    !
403 lltok::Kind LLLexer::LexExclaim() {
404   // Lex a metadata name as a MetadataVar.
405   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
406       CurPtr[0] == '-' || CurPtr[0] == '$' ||
407       CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\') {
408     ++CurPtr;
409     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
410            CurPtr[0] == '-' || CurPtr[0] == '$' ||
411            CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\')
412       ++CurPtr;
413 
414     StrVal.assign(TokStart+1, CurPtr);   // Skip !
415     UnEscapeLexed(StrVal);
416     return lltok::MetadataVar;
417   }
418   return lltok::exclaim;
419 }
420 
421 /// Lex all tokens that start with a # character.
422 ///    AttrGrpID ::= #[0-9]+
423 lltok::Kind LLLexer::LexHash() {
424   // Handle AttrGrpID: #[0-9]+
425   if (isdigit(static_cast<unsigned char>(CurPtr[0]))) {
426     for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
427       /*empty*/;
428 
429     uint64_t Val = atoull(TokStart+1, CurPtr);
430     if ((unsigned)Val != Val)
431       Error("invalid value number (too large)!");
432     UIntVal = unsigned(Val);
433     return lltok::AttrGrpID;
434   }
435 
436   return lltok::Error;
437 }
438 
439 /// Lex a label, integer type, keyword, or hexadecimal integer constant.
440 ///    Label           [-a-zA-Z$._0-9]+:
441 ///    IntegerType     i[0-9]+
442 ///    Keyword         sdiv, float, ...
443 ///    HexIntConstant  [us]0x[0-9A-Fa-f]+
444 lltok::Kind LLLexer::LexIdentifier() {
445   const char *StartChar = CurPtr;
446   const char *IntEnd = CurPtr[-1] == 'i' ? nullptr : StartChar;
447   const char *KeywordEnd = nullptr;
448 
449   for (; isLabelChar(*CurPtr); ++CurPtr) {
450     // If we decide this is an integer, remember the end of the sequence.
451     if (!IntEnd && !isdigit(static_cast<unsigned char>(*CurPtr)))
452       IntEnd = CurPtr;
453     if (!KeywordEnd && !isalnum(static_cast<unsigned char>(*CurPtr)) &&
454         *CurPtr != '_')
455       KeywordEnd = CurPtr;
456   }
457 
458   // If we stopped due to a colon, this really is a label.
459   if (*CurPtr == ':') {
460     StrVal.assign(StartChar-1, CurPtr++);
461     return lltok::LabelStr;
462   }
463 
464   // Otherwise, this wasn't a label.  If this was valid as an integer type,
465   // return it.
466   if (!IntEnd) IntEnd = CurPtr;
467   if (IntEnd != StartChar) {
468     CurPtr = IntEnd;
469     uint64_t NumBits = atoull(StartChar, CurPtr);
470     if (NumBits < IntegerType::MIN_INT_BITS ||
471         NumBits > IntegerType::MAX_INT_BITS) {
472       Error("bitwidth for integer type out of range!");
473       return lltok::Error;
474     }
475     TyVal = IntegerType::get(Context, NumBits);
476     return lltok::Type;
477   }
478 
479   // Otherwise, this was a letter sequence.  See which keyword this is.
480   if (!KeywordEnd) KeywordEnd = CurPtr;
481   CurPtr = KeywordEnd;
482   --StartChar;
483   StringRef Keyword(StartChar, CurPtr - StartChar);
484 
485 #define KEYWORD(STR)                                                           \
486   do {                                                                         \
487     if (Keyword == #STR)                                                       \
488       return lltok::kw_##STR;                                                  \
489   } while (false)
490 
491   KEYWORD(true);    KEYWORD(false);
492   KEYWORD(declare); KEYWORD(define);
493   KEYWORD(global);  KEYWORD(constant);
494 
495   KEYWORD(private);
496   KEYWORD(internal);
497   KEYWORD(available_externally);
498   KEYWORD(linkonce);
499   KEYWORD(linkonce_odr);
500   KEYWORD(weak); // Use as a linkage, and a modifier for "cmpxchg".
501   KEYWORD(weak_odr);
502   KEYWORD(appending);
503   KEYWORD(dllimport);
504   KEYWORD(dllexport);
505   KEYWORD(common);
506   KEYWORD(default);
507   KEYWORD(hidden);
508   KEYWORD(protected);
509   KEYWORD(unnamed_addr);
510   KEYWORD(local_unnamed_addr);
511   KEYWORD(externally_initialized);
512   KEYWORD(extern_weak);
513   KEYWORD(external);
514   KEYWORD(thread_local);
515   KEYWORD(localdynamic);
516   KEYWORD(initialexec);
517   KEYWORD(localexec);
518   KEYWORD(zeroinitializer);
519   KEYWORD(undef);
520   KEYWORD(null);
521   KEYWORD(none);
522   KEYWORD(to);
523   KEYWORD(caller);
524   KEYWORD(within);
525   KEYWORD(from);
526   KEYWORD(tail);
527   KEYWORD(musttail);
528   KEYWORD(notail);
529   KEYWORD(target);
530   KEYWORD(triple);
531   KEYWORD(source_filename);
532   KEYWORD(unwind);
533   KEYWORD(deplibs);             // FIXME: Remove in 4.0.
534   KEYWORD(datalayout);
535   KEYWORD(volatile);
536   KEYWORD(atomic);
537   KEYWORD(unordered);
538   KEYWORD(monotonic);
539   KEYWORD(acquire);
540   KEYWORD(release);
541   KEYWORD(acq_rel);
542   KEYWORD(seq_cst);
543   KEYWORD(singlethread);
544 
545   KEYWORD(nnan);
546   KEYWORD(ninf);
547   KEYWORD(nsz);
548   KEYWORD(arcp);
549   KEYWORD(fast);
550   KEYWORD(nuw);
551   KEYWORD(nsw);
552   KEYWORD(exact);
553   KEYWORD(inbounds);
554   KEYWORD(align);
555   KEYWORD(addrspace);
556   KEYWORD(section);
557   KEYWORD(alias);
558   KEYWORD(ifunc);
559   KEYWORD(module);
560   KEYWORD(asm);
561   KEYWORD(sideeffect);
562   KEYWORD(alignstack);
563   KEYWORD(inteldialect);
564   KEYWORD(gc);
565   KEYWORD(prefix);
566   KEYWORD(prologue);
567 
568   KEYWORD(ccc);
569   KEYWORD(fastcc);
570   KEYWORD(coldcc);
571   KEYWORD(x86_stdcallcc);
572   KEYWORD(x86_fastcallcc);
573   KEYWORD(x86_thiscallcc);
574   KEYWORD(x86_vectorcallcc);
575   KEYWORD(arm_apcscc);
576   KEYWORD(arm_aapcscc);
577   KEYWORD(arm_aapcs_vfpcc);
578   KEYWORD(msp430_intrcc);
579   KEYWORD(avr_intrcc);
580   KEYWORD(avr_signalcc);
581   KEYWORD(ptx_kernel);
582   KEYWORD(ptx_device);
583   KEYWORD(spir_kernel);
584   KEYWORD(spir_func);
585   KEYWORD(intel_ocl_bicc);
586   KEYWORD(x86_64_sysvcc);
587   KEYWORD(x86_64_win64cc);
588   KEYWORD(x86_regcallcc);
589   KEYWORD(webkit_jscc);
590   KEYWORD(swiftcc);
591   KEYWORD(anyregcc);
592   KEYWORD(preserve_mostcc);
593   KEYWORD(preserve_allcc);
594   KEYWORD(ghccc);
595   KEYWORD(x86_intrcc);
596   KEYWORD(hhvmcc);
597   KEYWORD(hhvm_ccc);
598   KEYWORD(cxx_fast_tlscc);
599   KEYWORD(amdgpu_vs);
600   KEYWORD(amdgpu_gs);
601   KEYWORD(amdgpu_ps);
602   KEYWORD(amdgpu_cs);
603   KEYWORD(amdgpu_kernel);
604 
605   KEYWORD(cc);
606   KEYWORD(c);
607 
608   KEYWORD(attributes);
609 
610   KEYWORD(alwaysinline);
611   KEYWORD(allocsize);
612   KEYWORD(argmemonly);
613   KEYWORD(builtin);
614   KEYWORD(byval);
615   KEYWORD(inalloca);
616   KEYWORD(cold);
617   KEYWORD(convergent);
618   KEYWORD(dereferenceable);
619   KEYWORD(dereferenceable_or_null);
620   KEYWORD(inaccessiblememonly);
621   KEYWORD(inaccessiblemem_or_argmemonly);
622   KEYWORD(inlinehint);
623   KEYWORD(inreg);
624   KEYWORD(jumptable);
625   KEYWORD(minsize);
626   KEYWORD(naked);
627   KEYWORD(nest);
628   KEYWORD(noalias);
629   KEYWORD(nobuiltin);
630   KEYWORD(nocapture);
631   KEYWORD(noduplicate);
632   KEYWORD(noimplicitfloat);
633   KEYWORD(noinline);
634   KEYWORD(norecurse);
635   KEYWORD(nonlazybind);
636   KEYWORD(nonnull);
637   KEYWORD(noredzone);
638   KEYWORD(noreturn);
639   KEYWORD(nounwind);
640   KEYWORD(optnone);
641   KEYWORD(optsize);
642   KEYWORD(readnone);
643   KEYWORD(readonly);
644   KEYWORD(returned);
645   KEYWORD(returns_twice);
646   KEYWORD(signext);
647   KEYWORD(sret);
648   KEYWORD(ssp);
649   KEYWORD(sspreq);
650   KEYWORD(sspstrong);
651   KEYWORD(safestack);
652   KEYWORD(sanitize_address);
653   KEYWORD(sanitize_thread);
654   KEYWORD(sanitize_memory);
655   KEYWORD(swifterror);
656   KEYWORD(swiftself);
657   KEYWORD(uwtable);
658   KEYWORD(writeonly);
659   KEYWORD(zeroext);
660 
661   KEYWORD(type);
662   KEYWORD(opaque);
663 
664   KEYWORD(comdat);
665 
666   // Comdat types
667   KEYWORD(any);
668   KEYWORD(exactmatch);
669   KEYWORD(largest);
670   KEYWORD(noduplicates);
671   KEYWORD(samesize);
672 
673   KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
674   KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);
675   KEYWORD(oeq); KEYWORD(one); KEYWORD(olt); KEYWORD(ogt); KEYWORD(ole);
676   KEYWORD(oge); KEYWORD(ord); KEYWORD(uno); KEYWORD(ueq); KEYWORD(une);
677 
678   KEYWORD(xchg); KEYWORD(nand); KEYWORD(max); KEYWORD(min); KEYWORD(umax);
679   KEYWORD(umin);
680 
681   KEYWORD(x);
682   KEYWORD(blockaddress);
683 
684   // Metadata types.
685   KEYWORD(distinct);
686 
687   // Use-list order directives.
688   KEYWORD(uselistorder);
689   KEYWORD(uselistorder_bb);
690 
691   KEYWORD(personality);
692   KEYWORD(cleanup);
693   KEYWORD(catch);
694   KEYWORD(filter);
695 
696 #undef KEYWORD
697 
698   // Keywords for types.
699 #define TYPEKEYWORD(STR, LLVMTY)                                               \
700   do {                                                                         \
701     if (Keyword == STR) {                                                      \
702       TyVal = LLVMTY;                                                          \
703       return lltok::Type;                                                      \
704     }                                                                          \
705   } while (false)
706 
707   TYPEKEYWORD("void",      Type::getVoidTy(Context));
708   TYPEKEYWORD("half",      Type::getHalfTy(Context));
709   TYPEKEYWORD("float",     Type::getFloatTy(Context));
710   TYPEKEYWORD("double",    Type::getDoubleTy(Context));
711   TYPEKEYWORD("x86_fp80",  Type::getX86_FP80Ty(Context));
712   TYPEKEYWORD("fp128",     Type::getFP128Ty(Context));
713   TYPEKEYWORD("ppc_fp128", Type::getPPC_FP128Ty(Context));
714   TYPEKEYWORD("label",     Type::getLabelTy(Context));
715   TYPEKEYWORD("metadata",  Type::getMetadataTy(Context));
716   TYPEKEYWORD("x86_mmx",   Type::getX86_MMXTy(Context));
717   TYPEKEYWORD("token",     Type::getTokenTy(Context));
718 
719 #undef TYPEKEYWORD
720 
721   // Keywords for instructions.
722 #define INSTKEYWORD(STR, Enum)                                                 \
723   do {                                                                         \
724     if (Keyword == #STR) {                                                     \
725       UIntVal = Instruction::Enum;                                             \
726       return lltok::kw_##STR;                                                  \
727     }                                                                          \
728   } while (false)
729 
730   INSTKEYWORD(add,   Add);  INSTKEYWORD(fadd,   FAdd);
731   INSTKEYWORD(sub,   Sub);  INSTKEYWORD(fsub,   FSub);
732   INSTKEYWORD(mul,   Mul);  INSTKEYWORD(fmul,   FMul);
733   INSTKEYWORD(udiv,  UDiv); INSTKEYWORD(sdiv,  SDiv); INSTKEYWORD(fdiv,  FDiv);
734   INSTKEYWORD(urem,  URem); INSTKEYWORD(srem,  SRem); INSTKEYWORD(frem,  FRem);
735   INSTKEYWORD(shl,   Shl);  INSTKEYWORD(lshr,  LShr); INSTKEYWORD(ashr,  AShr);
736   INSTKEYWORD(and,   And);  INSTKEYWORD(or,    Or);   INSTKEYWORD(xor,   Xor);
737   INSTKEYWORD(icmp,  ICmp); INSTKEYWORD(fcmp,  FCmp);
738 
739   INSTKEYWORD(phi,         PHI);
740   INSTKEYWORD(call,        Call);
741   INSTKEYWORD(trunc,       Trunc);
742   INSTKEYWORD(zext,        ZExt);
743   INSTKEYWORD(sext,        SExt);
744   INSTKEYWORD(fptrunc,     FPTrunc);
745   INSTKEYWORD(fpext,       FPExt);
746   INSTKEYWORD(uitofp,      UIToFP);
747   INSTKEYWORD(sitofp,      SIToFP);
748   INSTKEYWORD(fptoui,      FPToUI);
749   INSTKEYWORD(fptosi,      FPToSI);
750   INSTKEYWORD(inttoptr,    IntToPtr);
751   INSTKEYWORD(ptrtoint,    PtrToInt);
752   INSTKEYWORD(bitcast,     BitCast);
753   INSTKEYWORD(addrspacecast, AddrSpaceCast);
754   INSTKEYWORD(select,      Select);
755   INSTKEYWORD(va_arg,      VAArg);
756   INSTKEYWORD(ret,         Ret);
757   INSTKEYWORD(br,          Br);
758   INSTKEYWORD(switch,      Switch);
759   INSTKEYWORD(indirectbr,  IndirectBr);
760   INSTKEYWORD(invoke,      Invoke);
761   INSTKEYWORD(resume,      Resume);
762   INSTKEYWORD(unreachable, Unreachable);
763 
764   INSTKEYWORD(alloca,      Alloca);
765   INSTKEYWORD(load,        Load);
766   INSTKEYWORD(store,       Store);
767   INSTKEYWORD(cmpxchg,     AtomicCmpXchg);
768   INSTKEYWORD(atomicrmw,   AtomicRMW);
769   INSTKEYWORD(fence,       Fence);
770   INSTKEYWORD(getelementptr, GetElementPtr);
771 
772   INSTKEYWORD(extractelement, ExtractElement);
773   INSTKEYWORD(insertelement,  InsertElement);
774   INSTKEYWORD(shufflevector,  ShuffleVector);
775   INSTKEYWORD(extractvalue,   ExtractValue);
776   INSTKEYWORD(insertvalue,    InsertValue);
777   INSTKEYWORD(landingpad,     LandingPad);
778   INSTKEYWORD(cleanupret,     CleanupRet);
779   INSTKEYWORD(catchret,       CatchRet);
780   INSTKEYWORD(catchswitch,  CatchSwitch);
781   INSTKEYWORD(catchpad,     CatchPad);
782   INSTKEYWORD(cleanuppad,   CleanupPad);
783 
784 #undef INSTKEYWORD
785 
786 #define DWKEYWORD(TYPE, TOKEN)                                                 \
787   do {                                                                         \
788     if (Keyword.startswith("DW_" #TYPE "_")) {                                 \
789       StrVal.assign(Keyword.begin(), Keyword.end());                           \
790       return lltok::TOKEN;                                                     \
791     }                                                                          \
792   } while (false)
793 
794   DWKEYWORD(TAG, DwarfTag);
795   DWKEYWORD(ATE, DwarfAttEncoding);
796   DWKEYWORD(VIRTUALITY, DwarfVirtuality);
797   DWKEYWORD(LANG, DwarfLang);
798   DWKEYWORD(CC, DwarfCC);
799   DWKEYWORD(OP, DwarfOp);
800   DWKEYWORD(MACINFO, DwarfMacinfo);
801 
802 #undef DWKEYWORD
803 
804   if (Keyword.startswith("DIFlag")) {
805     StrVal.assign(Keyword.begin(), Keyword.end());
806     return lltok::DIFlag;
807   }
808   if (Keyword == "NoDebug" || Keyword == "FullDebug" ||
809       Keyword == "LineTablesOnly") {
810     StrVal.assign(Keyword.begin(), Keyword.end());
811     return lltok::EmissionKind;
812   }
813 
814   // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
815   // the CFE to avoid forcing it to deal with 64-bit numbers.
816   if ((TokStart[0] == 'u' || TokStart[0] == 's') &&
817       TokStart[1] == '0' && TokStart[2] == 'x' &&
818       isxdigit(static_cast<unsigned char>(TokStart[3]))) {
819     int len = CurPtr-TokStart-3;
820     uint32_t bits = len * 4;
821     StringRef HexStr(TokStart + 3, len);
822     if (!all_of(HexStr, isxdigit)) {
823       // Bad token, return it as an error.
824       CurPtr = TokStart+3;
825       return lltok::Error;
826     }
827     APInt Tmp(bits, HexStr, 16);
828     uint32_t activeBits = Tmp.getActiveBits();
829     if (activeBits > 0 && activeBits < bits)
830       Tmp = Tmp.trunc(activeBits);
831     APSIntVal = APSInt(Tmp, TokStart[0] == 'u');
832     return lltok::APSInt;
833   }
834 
835   // If this is "cc1234", return this as just "cc".
836   if (TokStart[0] == 'c' && TokStart[1] == 'c') {
837     CurPtr = TokStart+2;
838     return lltok::kw_cc;
839   }
840 
841   // Finally, if this isn't known, return an error.
842   CurPtr = TokStart+1;
843   return lltok::Error;
844 }
845 
846 /// Lex all tokens that start with a 0x prefix, knowing they match and are not
847 /// labels.
848 ///    HexFPConstant     0x[0-9A-Fa-f]+
849 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
850 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
851 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
852 ///    HexHalfConstant   0xH[0-9A-Fa-f]+
853 lltok::Kind LLLexer::Lex0x() {
854   CurPtr = TokStart + 2;
855 
856   char Kind;
857   if ((CurPtr[0] >= 'K' && CurPtr[0] <= 'M') || CurPtr[0] == 'H') {
858     Kind = *CurPtr++;
859   } else {
860     Kind = 'J';
861   }
862 
863   if (!isxdigit(static_cast<unsigned char>(CurPtr[0]))) {
864     // Bad token, return it as an error.
865     CurPtr = TokStart+1;
866     return lltok::Error;
867   }
868 
869   while (isxdigit(static_cast<unsigned char>(CurPtr[0])))
870     ++CurPtr;
871 
872   if (Kind == 'J') {
873     // HexFPConstant - Floating point constant represented in IEEE format as a
874     // hexadecimal number for when exponential notation is not precise enough.
875     // Half, Float, and double only.
876     APFloatVal = APFloat(APFloat::IEEEdouble,
877                          APInt(64, HexIntToVal(TokStart + 2, CurPtr)));
878     return lltok::APFloat;
879   }
880 
881   uint64_t Pair[2];
882   switch (Kind) {
883   default: llvm_unreachable("Unknown kind!");
884   case 'K':
885     // F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
886     FP80HexToIntPair(TokStart+3, CurPtr, Pair);
887     APFloatVal = APFloat(APFloat::x87DoubleExtended, APInt(80, Pair));
888     return lltok::APFloat;
889   case 'L':
890     // F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
891     HexToIntPair(TokStart+3, CurPtr, Pair);
892     APFloatVal = APFloat(APFloat::IEEEquad, APInt(128, Pair));
893     return lltok::APFloat;
894   case 'M':
895     // PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
896     HexToIntPair(TokStart+3, CurPtr, Pair);
897     APFloatVal = APFloat(APFloat::PPCDoubleDouble, APInt(128, Pair));
898     return lltok::APFloat;
899   case 'H':
900     APFloatVal = APFloat(APFloat::IEEEhalf,
901                          APInt(16,HexIntToVal(TokStart+3, CurPtr)));
902     return lltok::APFloat;
903   }
904 }
905 
906 /// Lex tokens for a label or a numeric constant, possibly starting with -.
907 ///    Label             [-a-zA-Z$._0-9]+:
908 ///    NInteger          -[0-9]+
909 ///    FPConstant        [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
910 ///    PInteger          [0-9]+
911 ///    HexFPConstant     0x[0-9A-Fa-f]+
912 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
913 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
914 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
915 lltok::Kind LLLexer::LexDigitOrNegative() {
916   // If the letter after the negative is not a number, this is probably a label.
917   if (!isdigit(static_cast<unsigned char>(TokStart[0])) &&
918       !isdigit(static_cast<unsigned char>(CurPtr[0]))) {
919     // Okay, this is not a number after the -, it's probably a label.
920     if (const char *End = isLabelTail(CurPtr)) {
921       StrVal.assign(TokStart, End-1);
922       CurPtr = End;
923       return lltok::LabelStr;
924     }
925 
926     return lltok::Error;
927   }
928 
929   // At this point, it is either a label, int or fp constant.
930 
931   // Skip digits, we have at least one.
932   for (; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
933     /*empty*/;
934 
935   // Check to see if this really is a label afterall, e.g. "-1:".
936   if (isLabelChar(CurPtr[0]) || CurPtr[0] == ':') {
937     if (const char *End = isLabelTail(CurPtr)) {
938       StrVal.assign(TokStart, End-1);
939       CurPtr = End;
940       return lltok::LabelStr;
941     }
942   }
943 
944   // If the next character is a '.', then it is a fp value, otherwise its
945   // integer.
946   if (CurPtr[0] != '.') {
947     if (TokStart[0] == '0' && TokStart[1] == 'x')
948       return Lex0x();
949     APSIntVal = APSInt(StringRef(TokStart, CurPtr - TokStart));
950     return lltok::APSInt;
951   }
952 
953   ++CurPtr;
954 
955   // Skip over [0-9]*([eE][-+]?[0-9]+)?
956   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
957 
958   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
959     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
960         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
961           isdigit(static_cast<unsigned char>(CurPtr[2])))) {
962       CurPtr += 2;
963       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
964     }
965   }
966 
967   APFloatVal = APFloat(APFloat::IEEEdouble,
968                        StringRef(TokStart, CurPtr - TokStart));
969   return lltok::APFloat;
970 }
971 
972 /// Lex a floating point constant starting with +.
973 ///    FPConstant  [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
974 lltok::Kind LLLexer::LexPositive() {
975   // If the letter after the negative is a number, this is probably not a
976   // label.
977   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
978     return lltok::Error;
979 
980   // Skip digits.
981   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
982     /*empty*/;
983 
984   // At this point, we need a '.'.
985   if (CurPtr[0] != '.') {
986     CurPtr = TokStart+1;
987     return lltok::Error;
988   }
989 
990   ++CurPtr;
991 
992   // Skip over [0-9]*([eE][-+]?[0-9]+)?
993   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
994 
995   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
996     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
997         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
998         isdigit(static_cast<unsigned char>(CurPtr[2])))) {
999       CurPtr += 2;
1000       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
1001     }
1002   }
1003 
1004   APFloatVal = APFloat(APFloat::IEEEdouble,
1005                        StringRef(TokStart, CurPtr - TokStart));
1006   return lltok::APFloat;
1007 }
1008