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/StringExtras.h"
16 #include "llvm/ADT/Twine.h"
17 #include "llvm/AsmParser/Parser.h"
18 #include "llvm/IR/DerivedTypes.h"
19 #include "llvm/IR/Instruction.h"
20 #include "llvm/IR/LLVMContext.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Support/MemoryBuffer.h"
24 #include "llvm/Support/SourceMgr.h"
25 #include "llvm/Support/raw_ostream.h"
26 #include <cctype>
27 #include <cstdio>
28 #include <cstdlib>
29 #include <cstring>
30 using namespace llvm;
31 
32 bool LLLexer::Error(LocTy ErrorLoc, const Twine &Msg) const {
33   ErrorInfo = SM.GetMessage(ErrorLoc, SourceMgr::DK_Error, Msg);
34   return true;
35 }
36 
37 void LLLexer::Warning(LocTy WarningLoc, const Twine &Msg) const {
38   SM.PrintMessage(WarningLoc, SourceMgr::DK_Warning, Msg);
39 }
40 
41 //===----------------------------------------------------------------------===//
42 // Helper functions.
43 //===----------------------------------------------------------------------===//
44 
45 // atoull - Convert an ascii string of decimal digits into the unsigned long
46 // long representation... this does not have to do input error checking,
47 // because we know that the input will be matched by a suitable regex...
48 //
49 uint64_t LLLexer::atoull(const char *Buffer, const char *End) {
50   uint64_t Result = 0;
51   for (; Buffer != End; Buffer++) {
52     uint64_t OldRes = Result;
53     Result *= 10;
54     Result += *Buffer-'0';
55     if (Result < OldRes) {  // Uh, oh, overflow detected!!!
56       Error("constant bigger than 64 bits detected!");
57       return 0;
58     }
59   }
60   return Result;
61 }
62 
63 uint64_t LLLexer::HexIntToVal(const char *Buffer, const char *End) {
64   uint64_t Result = 0;
65   for (; Buffer != End; ++Buffer) {
66     uint64_t OldRes = Result;
67     Result *= 16;
68     Result += hexDigitValue(*Buffer);
69 
70     if (Result < OldRes) {   // Uh, oh, overflow detected!!!
71       Error("constant bigger than 64 bits detected!");
72       return 0;
73     }
74   }
75   return Result;
76 }
77 
78 void LLLexer::HexToIntPair(const char *Buffer, const char *End,
79                            uint64_t Pair[2]) {
80   Pair[0] = 0;
81   if (End - Buffer >= 16) {
82     for (int i = 0; i < 16; i++, Buffer++) {
83       assert(Buffer != End);
84       Pair[0] *= 16;
85       Pair[0] += hexDigitValue(*Buffer);
86     }
87   }
88   Pair[1] = 0;
89   for (int i = 0; i < 16 && Buffer != End; i++, Buffer++) {
90     Pair[1] *= 16;
91     Pair[1] += hexDigitValue(*Buffer);
92   }
93   if (Buffer != End)
94     Error("constant bigger than 128 bits detected!");
95 }
96 
97 /// FP80HexToIntPair - translate an 80 bit FP80 number (20 hexits) into
98 /// { low64, high16 } as usual for an APInt.
99 void LLLexer::FP80HexToIntPair(const char *Buffer, const char *End,
100                            uint64_t Pair[2]) {
101   Pair[1] = 0;
102   for (int i=0; i<4 && Buffer != End; i++, Buffer++) {
103     assert(Buffer != End);
104     Pair[1] *= 16;
105     Pair[1] += hexDigitValue(*Buffer);
106   }
107   Pair[0] = 0;
108   for (int i = 0; i < 16 && Buffer != End; i++, Buffer++) {
109     Pair[0] *= 16;
110     Pair[0] += hexDigitValue(*Buffer);
111   }
112   if (Buffer != End)
113     Error("constant bigger than 128 bits detected!");
114 }
115 
116 // UnEscapeLexed - Run through the specified buffer and change \xx codes to the
117 // appropriate character.
118 static void UnEscapeLexed(std::string &Str) {
119   if (Str.empty()) return;
120 
121   char *Buffer = &Str[0], *EndBuffer = Buffer+Str.size();
122   char *BOut = Buffer;
123   for (char *BIn = Buffer; BIn != EndBuffer; ) {
124     if (BIn[0] == '\\') {
125       if (BIn < EndBuffer-1 && BIn[1] == '\\') {
126         *BOut++ = '\\'; // Two \ becomes one
127         BIn += 2;
128       } else if (BIn < EndBuffer-2 &&
129                  isxdigit(static_cast<unsigned char>(BIn[1])) &&
130                  isxdigit(static_cast<unsigned char>(BIn[2]))) {
131         *BOut = hexDigitValue(BIn[1]) * 16 + hexDigitValue(BIn[2]);
132         BIn += 3;                           // Skip over handled chars
133         ++BOut;
134       } else {
135         *BOut++ = *BIn++;
136       }
137     } else {
138       *BOut++ = *BIn++;
139     }
140   }
141   Str.resize(BOut-Buffer);
142 }
143 
144 /// isLabelChar - Return true for [-a-zA-Z$._0-9].
145 static bool isLabelChar(char C) {
146   return isalnum(static_cast<unsigned char>(C)) || C == '-' || C == '$' ||
147          C == '.' || C == '_';
148 }
149 
150 
151 /// isLabelTail - Return true if this pointer points to a valid end of a label.
152 static const char *isLabelTail(const char *CurPtr) {
153   while (1) {
154     if (CurPtr[0] == ':') return CurPtr+1;
155     if (!isLabelChar(CurPtr[0])) return nullptr;
156     ++CurPtr;
157   }
158 }
159 
160 
161 
162 //===----------------------------------------------------------------------===//
163 // Lexer definition.
164 //===----------------------------------------------------------------------===//
165 
166 LLLexer::LLLexer(StringRef StartBuf, SourceMgr &sm, SMDiagnostic &Err,
167                  LLVMContext &C)
168   : CurBuf(StartBuf), ErrorInfo(Err), SM(sm), Context(C), APFloatVal(0.0) {
169   CurPtr = CurBuf.begin();
170 }
171 
172 int LLLexer::getNextChar() {
173   char CurChar = *CurPtr++;
174   switch (CurChar) {
175   default: return (unsigned char)CurChar;
176   case 0:
177     // A nul character in the stream is either the end of the current buffer or
178     // a random nul in the file.  Disambiguate that here.
179     if (CurPtr-1 != CurBuf.end())
180       return 0;  // Just whitespace.
181 
182     // Otherwise, return end of file.
183     --CurPtr;  // Another call to lex will return EOF again.
184     return EOF;
185   }
186 }
187 
188 
189 lltok::Kind LLLexer::LexToken() {
190   TokStart = CurPtr;
191 
192   int CurChar = getNextChar();
193   switch (CurChar) {
194   default:
195     // Handle letters: [a-zA-Z_]
196     if (isalpha(static_cast<unsigned char>(CurChar)) || CurChar == '_')
197       return LexIdentifier();
198 
199     return lltok::Error;
200   case EOF: return lltok::Eof;
201   case 0:
202   case ' ':
203   case '\t':
204   case '\n':
205   case '\r':
206     // Ignore whitespace.
207     return LexToken();
208   case '+': return LexPositive();
209   case '@': return LexAt();
210   case '$': return LexDollar();
211   case '%': return LexPercent();
212   case '"': return LexQuote();
213   case '.':
214     if (const char *Ptr = isLabelTail(CurPtr)) {
215       CurPtr = Ptr;
216       StrVal.assign(TokStart, CurPtr-1);
217       return lltok::LabelStr;
218     }
219     if (CurPtr[0] == '.' && CurPtr[1] == '.') {
220       CurPtr += 2;
221       return lltok::dotdotdot;
222     }
223     return lltok::Error;
224   case ';':
225     SkipLineComment();
226     return LexToken();
227   case '!': return LexExclaim();
228   case '#': return LexHash();
229   case '0': case '1': case '2': case '3': case '4':
230   case '5': case '6': case '7': case '8': case '9':
231   case '-':
232     return LexDigitOrNegative();
233   case '=': return lltok::equal;
234   case '[': return lltok::lsquare;
235   case ']': return lltok::rsquare;
236   case '{': return lltok::lbrace;
237   case '}': return lltok::rbrace;
238   case '<': return lltok::less;
239   case '>': return lltok::greater;
240   case '(': return lltok::lparen;
241   case ')': return lltok::rparen;
242   case ',': return lltok::comma;
243   case '*': return lltok::star;
244   case '|': return lltok::bar;
245   }
246 }
247 
248 void LLLexer::SkipLineComment() {
249   while (1) {
250     if (CurPtr[0] == '\n' || CurPtr[0] == '\r' || getNextChar() == EOF)
251       return;
252   }
253 }
254 
255 /// Lex all tokens that start with an @ character.
256 ///   GlobalVar   @\"[^\"]*\"
257 ///   GlobalVar   @[-a-zA-Z$._][-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 (1) {
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$._0-9]*
294   if (ReadVarName())
295     return lltok::ComdatVar;
296 
297   return lltok::Error;
298 }
299 
300 /// ReadString - Read a string until the closing quote.
301 lltok::Kind LLLexer::ReadString(lltok::Kind kind) {
302   const char *Start = CurPtr;
303   while (1) {
304     int CurChar = getNextChar();
305 
306     if (CurChar == EOF) {
307       Error("end of file in string constant");
308       return lltok::Error;
309     }
310     if (CurChar == '"') {
311       StrVal.assign(Start, CurPtr-1);
312       UnEscapeLexed(StrVal);
313       return kind;
314     }
315   }
316 }
317 
318 /// ReadVarName - Read the rest of a token containing a variable name.
319 bool LLLexer::ReadVarName() {
320   const char *NameStart = CurPtr;
321   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
322       CurPtr[0] == '-' || CurPtr[0] == '$' ||
323       CurPtr[0] == '.' || CurPtr[0] == '_') {
324     ++CurPtr;
325     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
326            CurPtr[0] == '-' || CurPtr[0] == '$' ||
327            CurPtr[0] == '.' || CurPtr[0] == '_')
328       ++CurPtr;
329 
330     StrVal.assign(NameStart, CurPtr);
331     return true;
332   }
333   return false;
334 }
335 
336 lltok::Kind LLLexer::LexVar(lltok::Kind Var, lltok::Kind VarID) {
337   // Handle StringConstant: \"[^\"]*\"
338   if (CurPtr[0] == '"') {
339     ++CurPtr;
340 
341     while (1) {
342       int CurChar = getNextChar();
343 
344       if (CurChar == EOF) {
345         Error("end of file in global variable name");
346         return lltok::Error;
347       }
348       if (CurChar == '"') {
349         StrVal.assign(TokStart+2, CurPtr-1);
350         UnEscapeLexed(StrVal);
351         if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
352           Error("Null bytes are not allowed in names");
353           return lltok::Error;
354         }
355         return Var;
356       }
357     }
358   }
359 
360   // Handle VarName: [-a-zA-Z$._][-a-zA-Z$._0-9]*
361   if (ReadVarName())
362     return Var;
363 
364   // Handle VarID: [0-9]+
365   if (isdigit(static_cast<unsigned char>(CurPtr[0]))) {
366     for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
367       /*empty*/;
368 
369     uint64_t Val = atoull(TokStart+1, CurPtr);
370     if ((unsigned)Val != Val)
371       Error("invalid value number (too large)!");
372     UIntVal = unsigned(Val);
373     return VarID;
374   }
375   return lltok::Error;
376 }
377 
378 /// Lex all tokens that start with a % character.
379 ///   LocalVar   ::= %\"[^\"]*\"
380 ///   LocalVar   ::= %[-a-zA-Z$._][-a-zA-Z$._0-9]*
381 ///   LocalVarID ::= %[0-9]+
382 lltok::Kind LLLexer::LexPercent() {
383   return LexVar(lltok::LocalVar, lltok::LocalVarID);
384 }
385 
386 /// Lex all tokens that start with a " character.
387 ///   QuoteLabel        "[^"]+":
388 ///   StringConstant    "[^"]*"
389 lltok::Kind LLLexer::LexQuote() {
390   lltok::Kind kind = ReadString(lltok::StringConstant);
391   if (kind == lltok::Error || kind == lltok::Eof)
392     return kind;
393 
394   if (CurPtr[0] == ':') {
395     ++CurPtr;
396     if (StringRef(StrVal).find_first_of(0) != StringRef::npos) {
397       Error("Null bytes are not allowed in names");
398       kind = lltok::Error;
399     } else {
400       kind = lltok::LabelStr;
401     }
402   }
403 
404   return kind;
405 }
406 
407 /// Lex all tokens that start with a ! character.
408 ///    !foo
409 ///    !
410 lltok::Kind LLLexer::LexExclaim() {
411   // Lex a metadata name as a MetadataVar.
412   if (isalpha(static_cast<unsigned char>(CurPtr[0])) ||
413       CurPtr[0] == '-' || CurPtr[0] == '$' ||
414       CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\') {
415     ++CurPtr;
416     while (isalnum(static_cast<unsigned char>(CurPtr[0])) ||
417            CurPtr[0] == '-' || CurPtr[0] == '$' ||
418            CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\')
419       ++CurPtr;
420 
421     StrVal.assign(TokStart+1, CurPtr);   // Skip !
422     UnEscapeLexed(StrVal);
423     return lltok::MetadataVar;
424   }
425   return lltok::exclaim;
426 }
427 
428 /// Lex all tokens that start with a # character.
429 ///    AttrGrpID ::= #[0-9]+
430 lltok::Kind LLLexer::LexHash() {
431   // Handle AttrGrpID: #[0-9]+
432   if (isdigit(static_cast<unsigned char>(CurPtr[0]))) {
433     for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
434       /*empty*/;
435 
436     uint64_t Val = atoull(TokStart+1, CurPtr);
437     if ((unsigned)Val != Val)
438       Error("invalid value number (too large)!");
439     UIntVal = unsigned(Val);
440     return lltok::AttrGrpID;
441   }
442 
443   return lltok::Error;
444 }
445 
446 /// Lex a label, integer type, keyword, or hexadecimal integer constant.
447 ///    Label           [-a-zA-Z$._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, this really is a label.
466   if (*CurPtr == ':') {
467     StrVal.assign(StartChar-1, CurPtr++);
468     return lltok::LabelStr;
469   }
470 
471   // Otherwise, this wasn't a label.  If this was valid as an integer type,
472   // return it.
473   if (!IntEnd) IntEnd = CurPtr;
474   if (IntEnd != StartChar) {
475     CurPtr = IntEnd;
476     uint64_t NumBits = atoull(StartChar, CurPtr);
477     if (NumBits < IntegerType::MIN_INT_BITS ||
478         NumBits > IntegerType::MAX_INT_BITS) {
479       Error("bitwidth for integer type out of range!");
480       return lltok::Error;
481     }
482     TyVal = IntegerType::get(Context, NumBits);
483     return lltok::Type;
484   }
485 
486   // Otherwise, this was a letter sequence.  See which keyword this is.
487   if (!KeywordEnd) KeywordEnd = CurPtr;
488   CurPtr = KeywordEnd;
489   --StartChar;
490   StringRef Keyword(StartChar, CurPtr - StartChar);
491 #define KEYWORD(STR)                                                           \
492   do {                                                                         \
493     if (Keyword == #STR)                                                       \
494       return lltok::kw_##STR;                                                  \
495   } while (0)
496 
497   KEYWORD(true);    KEYWORD(false);
498   KEYWORD(declare); KEYWORD(define);
499   KEYWORD(global);  KEYWORD(constant);
500 
501   KEYWORD(private);
502   KEYWORD(internal);
503   KEYWORD(available_externally);
504   KEYWORD(linkonce);
505   KEYWORD(linkonce_odr);
506   KEYWORD(weak); // Use as a linkage, and a modifier for "cmpxchg".
507   KEYWORD(weak_odr);
508   KEYWORD(appending);
509   KEYWORD(dllimport);
510   KEYWORD(dllexport);
511   KEYWORD(common);
512   KEYWORD(default);
513   KEYWORD(hidden);
514   KEYWORD(protected);
515   KEYWORD(unnamed_addr);
516   KEYWORD(externally_initialized);
517   KEYWORD(extern_weak);
518   KEYWORD(external);
519   KEYWORD(thread_local);
520   KEYWORD(localdynamic);
521   KEYWORD(initialexec);
522   KEYWORD(localexec);
523   KEYWORD(zeroinitializer);
524   KEYWORD(undef);
525   KEYWORD(null);
526   KEYWORD(none);
527   KEYWORD(to);
528   KEYWORD(caller);
529   KEYWORD(tail);
530   KEYWORD(musttail);
531   KEYWORD(notail);
532   KEYWORD(target);
533   KEYWORD(triple);
534   KEYWORD(unwind);
535   KEYWORD(deplibs);             // FIXME: Remove in 4.0.
536   KEYWORD(datalayout);
537   KEYWORD(volatile);
538   KEYWORD(atomic);
539   KEYWORD(unordered);
540   KEYWORD(monotonic);
541   KEYWORD(acquire);
542   KEYWORD(release);
543   KEYWORD(acq_rel);
544   KEYWORD(seq_cst);
545   KEYWORD(singlethread);
546 
547   KEYWORD(nnan);
548   KEYWORD(ninf);
549   KEYWORD(nsz);
550   KEYWORD(arcp);
551   KEYWORD(fast);
552   KEYWORD(nuw);
553   KEYWORD(nsw);
554   KEYWORD(exact);
555   KEYWORD(inbounds);
556   KEYWORD(align);
557   KEYWORD(addrspace);
558   KEYWORD(section);
559   KEYWORD(alias);
560   KEYWORD(module);
561   KEYWORD(asm);
562   KEYWORD(sideeffect);
563   KEYWORD(alignstack);
564   KEYWORD(inteldialect);
565   KEYWORD(gc);
566   KEYWORD(prefix);
567   KEYWORD(prologue);
568 
569   KEYWORD(ccc);
570   KEYWORD(fastcc);
571   KEYWORD(coldcc);
572   KEYWORD(x86_stdcallcc);
573   KEYWORD(x86_fastcallcc);
574   KEYWORD(x86_thiscallcc);
575   KEYWORD(x86_vectorcallcc);
576   KEYWORD(arm_apcscc);
577   KEYWORD(arm_aapcscc);
578   KEYWORD(arm_aapcs_vfpcc);
579   KEYWORD(msp430_intrcc);
580   KEYWORD(ptx_kernel);
581   KEYWORD(ptx_device);
582   KEYWORD(spir_kernel);
583   KEYWORD(spir_func);
584   KEYWORD(intel_ocl_bicc);
585   KEYWORD(x86_64_sysvcc);
586   KEYWORD(x86_64_win64cc);
587   KEYWORD(webkit_jscc);
588   KEYWORD(anyregcc);
589   KEYWORD(preserve_mostcc);
590   KEYWORD(preserve_allcc);
591   KEYWORD(ghccc);
592   KEYWORD(hhvmcc);
593   KEYWORD(hhvm_ccc);
594   KEYWORD(cxx_fast_tlscc);
595 
596   KEYWORD(cc);
597   KEYWORD(c);
598 
599   KEYWORD(attributes);
600 
601   KEYWORD(alwaysinline);
602   KEYWORD(argmemonly);
603   KEYWORD(builtin);
604   KEYWORD(byval);
605   KEYWORD(inalloca);
606   KEYWORD(cold);
607   KEYWORD(convergent);
608   KEYWORD(dereferenceable);
609   KEYWORD(dereferenceable_or_null);
610   KEYWORD(inlinehint);
611   KEYWORD(inreg);
612   KEYWORD(jumptable);
613   KEYWORD(minsize);
614   KEYWORD(naked);
615   KEYWORD(nest);
616   KEYWORD(noalias);
617   KEYWORD(nobuiltin);
618   KEYWORD(nocapture);
619   KEYWORD(noduplicate);
620   KEYWORD(noimplicitfloat);
621   KEYWORD(noinline);
622   KEYWORD(norecurse);
623   KEYWORD(nonlazybind);
624   KEYWORD(nonnull);
625   KEYWORD(noredzone);
626   KEYWORD(noreturn);
627   KEYWORD(nounwind);
628   KEYWORD(optnone);
629   KEYWORD(optsize);
630   KEYWORD(readnone);
631   KEYWORD(readonly);
632   KEYWORD(returned);
633   KEYWORD(returns_twice);
634   KEYWORD(signext);
635   KEYWORD(sret);
636   KEYWORD(ssp);
637   KEYWORD(sspreq);
638   KEYWORD(sspstrong);
639   KEYWORD(safestack);
640   KEYWORD(sanitize_address);
641   KEYWORD(sanitize_thread);
642   KEYWORD(sanitize_memory);
643   KEYWORD(uwtable);
644   KEYWORD(zeroext);
645 
646   KEYWORD(type);
647   KEYWORD(opaque);
648 
649   KEYWORD(comdat);
650 
651   // Comdat types
652   KEYWORD(any);
653   KEYWORD(exactmatch);
654   KEYWORD(largest);
655   KEYWORD(noduplicates);
656   KEYWORD(samesize);
657 
658   KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
659   KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);
660   KEYWORD(oeq); KEYWORD(one); KEYWORD(olt); KEYWORD(ogt); KEYWORD(ole);
661   KEYWORD(oge); KEYWORD(ord); KEYWORD(uno); KEYWORD(ueq); KEYWORD(une);
662 
663   KEYWORD(xchg); KEYWORD(nand); KEYWORD(max); KEYWORD(min); KEYWORD(umax);
664   KEYWORD(umin);
665 
666   KEYWORD(x);
667   KEYWORD(blockaddress);
668 
669   // Metadata types.
670   KEYWORD(distinct);
671 
672   // Use-list order directives.
673   KEYWORD(uselistorder);
674   KEYWORD(uselistorder_bb);
675 
676   KEYWORD(personality);
677   KEYWORD(cleanup);
678   KEYWORD(catch);
679   KEYWORD(filter);
680 #undef KEYWORD
681 
682   // Keywords for types.
683 #define TYPEKEYWORD(STR, LLVMTY)                                               \
684   do {                                                                         \
685     if (Keyword == STR) {                                                      \
686       TyVal = LLVMTY;                                                          \
687       return lltok::Type;                                                      \
688     }                                                                          \
689   } while (false)
690   TYPEKEYWORD("void",      Type::getVoidTy(Context));
691   TYPEKEYWORD("half",      Type::getHalfTy(Context));
692   TYPEKEYWORD("float",     Type::getFloatTy(Context));
693   TYPEKEYWORD("double",    Type::getDoubleTy(Context));
694   TYPEKEYWORD("x86_fp80",  Type::getX86_FP80Ty(Context));
695   TYPEKEYWORD("fp128",     Type::getFP128Ty(Context));
696   TYPEKEYWORD("ppc_fp128", Type::getPPC_FP128Ty(Context));
697   TYPEKEYWORD("label",     Type::getLabelTy(Context));
698   TYPEKEYWORD("metadata",  Type::getMetadataTy(Context));
699   TYPEKEYWORD("x86_mmx",   Type::getX86_MMXTy(Context));
700   TYPEKEYWORD("token",     Type::getTokenTy(Context));
701 #undef TYPEKEYWORD
702 
703   // Keywords for instructions.
704 #define INSTKEYWORD(STR, Enum)                                                 \
705   do {                                                                         \
706     if (Keyword == #STR) {                                                     \
707       UIntVal = Instruction::Enum;                                             \
708       return lltok::kw_##STR;                                                  \
709     }                                                                          \
710   } while (false)
711 
712   INSTKEYWORD(add,   Add);  INSTKEYWORD(fadd,   FAdd);
713   INSTKEYWORD(sub,   Sub);  INSTKEYWORD(fsub,   FSub);
714   INSTKEYWORD(mul,   Mul);  INSTKEYWORD(fmul,   FMul);
715   INSTKEYWORD(udiv,  UDiv); INSTKEYWORD(sdiv,  SDiv); INSTKEYWORD(fdiv,  FDiv);
716   INSTKEYWORD(urem,  URem); INSTKEYWORD(srem,  SRem); INSTKEYWORD(frem,  FRem);
717   INSTKEYWORD(shl,   Shl);  INSTKEYWORD(lshr,  LShr); INSTKEYWORD(ashr,  AShr);
718   INSTKEYWORD(and,   And);  INSTKEYWORD(or,    Or);   INSTKEYWORD(xor,   Xor);
719   INSTKEYWORD(icmp,  ICmp); INSTKEYWORD(fcmp,  FCmp);
720 
721   INSTKEYWORD(phi,         PHI);
722   INSTKEYWORD(call,        Call);
723   INSTKEYWORD(trunc,       Trunc);
724   INSTKEYWORD(zext,        ZExt);
725   INSTKEYWORD(sext,        SExt);
726   INSTKEYWORD(fptrunc,     FPTrunc);
727   INSTKEYWORD(fpext,       FPExt);
728   INSTKEYWORD(uitofp,      UIToFP);
729   INSTKEYWORD(sitofp,      SIToFP);
730   INSTKEYWORD(fptoui,      FPToUI);
731   INSTKEYWORD(fptosi,      FPToSI);
732   INSTKEYWORD(inttoptr,    IntToPtr);
733   INSTKEYWORD(ptrtoint,    PtrToInt);
734   INSTKEYWORD(bitcast,     BitCast);
735   INSTKEYWORD(addrspacecast, AddrSpaceCast);
736   INSTKEYWORD(select,      Select);
737   INSTKEYWORD(va_arg,      VAArg);
738   INSTKEYWORD(ret,         Ret);
739   INSTKEYWORD(br,          Br);
740   INSTKEYWORD(switch,      Switch);
741   INSTKEYWORD(indirectbr,  IndirectBr);
742   INSTKEYWORD(invoke,      Invoke);
743   INSTKEYWORD(resume,      Resume);
744   INSTKEYWORD(unreachable, Unreachable);
745 
746   INSTKEYWORD(alloca,      Alloca);
747   INSTKEYWORD(load,        Load);
748   INSTKEYWORD(store,       Store);
749   INSTKEYWORD(cmpxchg,     AtomicCmpXchg);
750   INSTKEYWORD(atomicrmw,   AtomicRMW);
751   INSTKEYWORD(fence,       Fence);
752   INSTKEYWORD(getelementptr, GetElementPtr);
753 
754   INSTKEYWORD(extractelement, ExtractElement);
755   INSTKEYWORD(insertelement,  InsertElement);
756   INSTKEYWORD(shufflevector,  ShuffleVector);
757   INSTKEYWORD(extractvalue,   ExtractValue);
758   INSTKEYWORD(insertvalue,    InsertValue);
759   INSTKEYWORD(landingpad,     LandingPad);
760   INSTKEYWORD(cleanupret,     CleanupRet);
761   INSTKEYWORD(catchret,       CatchRet);
762   INSTKEYWORD(catchpad,     CatchPad);
763   INSTKEYWORD(terminatepad, TerminatePad);
764   INSTKEYWORD(cleanuppad,   CleanupPad);
765   INSTKEYWORD(catchendpad,  CatchEndPad);
766   INSTKEYWORD(cleanupendpad, CleanupEndPad);
767 #undef INSTKEYWORD
768 
769 #define DWKEYWORD(TYPE, TOKEN)                                                 \
770   do {                                                                         \
771     if (Keyword.startswith("DW_" #TYPE "_")) {                                 \
772       StrVal.assign(Keyword.begin(), Keyword.end());                           \
773       return lltok::TOKEN;                                                     \
774     }                                                                          \
775   } while (false)
776   DWKEYWORD(TAG, DwarfTag);
777   DWKEYWORD(ATE, DwarfAttEncoding);
778   DWKEYWORD(VIRTUALITY, DwarfVirtuality);
779   DWKEYWORD(LANG, DwarfLang);
780   DWKEYWORD(OP, DwarfOp);
781 #undef DWKEYWORD
782 
783   if (Keyword.startswith("DIFlag")) {
784     StrVal.assign(Keyword.begin(), Keyword.end());
785     return lltok::DIFlag;
786   }
787 
788   // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
789   // the CFE to avoid forcing it to deal with 64-bit numbers.
790   if ((TokStart[0] == 'u' || TokStart[0] == 's') &&
791       TokStart[1] == '0' && TokStart[2] == 'x' &&
792       isxdigit(static_cast<unsigned char>(TokStart[3]))) {
793     int len = CurPtr-TokStart-3;
794     uint32_t bits = len * 4;
795     StringRef HexStr(TokStart + 3, len);
796     if (!std::all_of(HexStr.begin(), HexStr.end(), isxdigit)) {
797       // Bad token, return it as an error.
798       CurPtr = TokStart+3;
799       return lltok::Error;
800     }
801     APInt Tmp(bits, HexStr, 16);
802     uint32_t activeBits = Tmp.getActiveBits();
803     if (activeBits > 0 && activeBits < bits)
804       Tmp = Tmp.trunc(activeBits);
805     APSIntVal = APSInt(Tmp, TokStart[0] == 'u');
806     return lltok::APSInt;
807   }
808 
809   // If this is "cc1234", return this as just "cc".
810   if (TokStart[0] == 'c' && TokStart[1] == 'c') {
811     CurPtr = TokStart+2;
812     return lltok::kw_cc;
813   }
814 
815   // Finally, if this isn't known, return an error.
816   CurPtr = TokStart+1;
817   return lltok::Error;
818 }
819 
820 /// Lex all tokens that start with a 0x prefix, knowing they match and are not
821 /// labels.
822 ///    HexFPConstant     0x[0-9A-Fa-f]+
823 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
824 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
825 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
826 ///    HexHalfConstant   0xH[0-9A-Fa-f]+
827 lltok::Kind LLLexer::Lex0x() {
828   CurPtr = TokStart + 2;
829 
830   char Kind;
831   if ((CurPtr[0] >= 'K' && CurPtr[0] <= 'M') || CurPtr[0] == 'H') {
832     Kind = *CurPtr++;
833   } else {
834     Kind = 'J';
835   }
836 
837   if (!isxdigit(static_cast<unsigned char>(CurPtr[0]))) {
838     // Bad token, return it as an error.
839     CurPtr = TokStart+1;
840     return lltok::Error;
841   }
842 
843   while (isxdigit(static_cast<unsigned char>(CurPtr[0])))
844     ++CurPtr;
845 
846   if (Kind == 'J') {
847     // HexFPConstant - Floating point constant represented in IEEE format as a
848     // hexadecimal number for when exponential notation is not precise enough.
849     // Half, Float, and double only.
850     APFloatVal = APFloat(BitsToDouble(HexIntToVal(TokStart+2, CurPtr)));
851     return lltok::APFloat;
852   }
853 
854   uint64_t Pair[2];
855   switch (Kind) {
856   default: llvm_unreachable("Unknown kind!");
857   case 'K':
858     // F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
859     FP80HexToIntPair(TokStart+3, CurPtr, Pair);
860     APFloatVal = APFloat(APFloat::x87DoubleExtended, APInt(80, Pair));
861     return lltok::APFloat;
862   case 'L':
863     // F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
864     HexToIntPair(TokStart+3, CurPtr, Pair);
865     APFloatVal = APFloat(APFloat::IEEEquad, APInt(128, Pair));
866     return lltok::APFloat;
867   case 'M':
868     // PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
869     HexToIntPair(TokStart+3, CurPtr, Pair);
870     APFloatVal = APFloat(APFloat::PPCDoubleDouble, APInt(128, Pair));
871     return lltok::APFloat;
872   case 'H':
873     APFloatVal = APFloat(APFloat::IEEEhalf,
874                          APInt(16,HexIntToVal(TokStart+3, CurPtr)));
875     return lltok::APFloat;
876   }
877 }
878 
879 /// Lex tokens for a label or a numeric constant, possibly starting with -.
880 ///    Label             [-a-zA-Z$._0-9]+:
881 ///    NInteger          -[0-9]+
882 ///    FPConstant        [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
883 ///    PInteger          [0-9]+
884 ///    HexFPConstant     0x[0-9A-Fa-f]+
885 ///    HexFP80Constant   0xK[0-9A-Fa-f]+
886 ///    HexFP128Constant  0xL[0-9A-Fa-f]+
887 ///    HexPPC128Constant 0xM[0-9A-Fa-f]+
888 lltok::Kind LLLexer::LexDigitOrNegative() {
889   // If the letter after the negative is not a number, this is probably a label.
890   if (!isdigit(static_cast<unsigned char>(TokStart[0])) &&
891       !isdigit(static_cast<unsigned char>(CurPtr[0]))) {
892     // Okay, this is not a number after the -, it's probably a label.
893     if (const char *End = isLabelTail(CurPtr)) {
894       StrVal.assign(TokStart, End-1);
895       CurPtr = End;
896       return lltok::LabelStr;
897     }
898 
899     return lltok::Error;
900   }
901 
902   // At this point, it is either a label, int or fp constant.
903 
904   // Skip digits, we have at least one.
905   for (; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
906     /*empty*/;
907 
908   // Check to see if this really is a label afterall, e.g. "-1:".
909   if (isLabelChar(CurPtr[0]) || CurPtr[0] == ':') {
910     if (const char *End = isLabelTail(CurPtr)) {
911       StrVal.assign(TokStart, End-1);
912       CurPtr = End;
913       return lltok::LabelStr;
914     }
915   }
916 
917   // If the next character is a '.', then it is a fp value, otherwise its
918   // integer.
919   if (CurPtr[0] != '.') {
920     if (TokStart[0] == '0' && TokStart[1] == 'x')
921       return Lex0x();
922     APSIntVal = APSInt(StringRef(TokStart, CurPtr - TokStart));
923     return lltok::APSInt;
924   }
925 
926   ++CurPtr;
927 
928   // Skip over [0-9]*([eE][-+]?[0-9]+)?
929   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
930 
931   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
932     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
933         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
934           isdigit(static_cast<unsigned char>(CurPtr[2])))) {
935       CurPtr += 2;
936       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
937     }
938   }
939 
940   APFloatVal = APFloat(std::atof(TokStart));
941   return lltok::APFloat;
942 }
943 
944 /// Lex a floating point constant starting with +.
945 ///    FPConstant  [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
946 lltok::Kind LLLexer::LexPositive() {
947   // If the letter after the negative is a number, this is probably not a
948   // label.
949   if (!isdigit(static_cast<unsigned char>(CurPtr[0])))
950     return lltok::Error;
951 
952   // Skip digits.
953   for (++CurPtr; isdigit(static_cast<unsigned char>(CurPtr[0])); ++CurPtr)
954     /*empty*/;
955 
956   // At this point, we need a '.'.
957   if (CurPtr[0] != '.') {
958     CurPtr = TokStart+1;
959     return lltok::Error;
960   }
961 
962   ++CurPtr;
963 
964   // Skip over [0-9]*([eE][-+]?[0-9]+)?
965   while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
966 
967   if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
968     if (isdigit(static_cast<unsigned char>(CurPtr[1])) ||
969         ((CurPtr[1] == '-' || CurPtr[1] == '+') &&
970         isdigit(static_cast<unsigned char>(CurPtr[2])))) {
971       CurPtr += 2;
972       while (isdigit(static_cast<unsigned char>(CurPtr[0]))) ++CurPtr;
973     }
974   }
975 
976   APFloatVal = APFloat(std::atof(TokStart));
977   return lltok::APFloat;
978 }
979