1 //===- LLLexer.cpp - Lexer for .ll Files ----------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Implement the Lexer for .ll files.
12 //===----------------------------------------------------------------------===//
15 #include "llvm/DerivedTypes.h"
16 #include "llvm/Instruction.h"
17 #include "llvm/LLVMContext.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/Assembly/Parser.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Support/SourceMgr.h"
24 #include "llvm/Support/raw_ostream.h"
31 bool LLLexer::Error(LocTy ErrorLoc, const Twine &Msg) const {
32 ErrorInfo = SM.GetMessage(ErrorLoc, SourceMgr::DK_Error, Msg);
36 //===----------------------------------------------------------------------===//
38 //===----------------------------------------------------------------------===//
40 // atoull - Convert an ascii string of decimal digits into the unsigned long
41 // long representation... this does not have to do input error checking,
42 // because we know that the input will be matched by a suitable regex...
44 uint64_t LLLexer::atoull(const char *Buffer, const char *End) {
46 for (; Buffer != End; Buffer++) {
47 uint64_t OldRes = Result;
49 Result += *Buffer-'0';
50 if (Result < OldRes) { // Uh, oh, overflow detected!!!
51 Error("constant bigger than 64 bits detected!");
58 static char parseHexChar(char C) {
59 if (C >= '0' && C <= '9')
61 if (C >= 'A' && C <= 'F')
63 if (C >= 'a' && C <= 'f')
68 uint64_t LLLexer::HexIntToVal(const char *Buffer, const char *End) {
70 for (; Buffer != End; ++Buffer) {
71 uint64_t OldRes = Result;
73 Result += parseHexChar(*Buffer);
75 if (Result < OldRes) { // Uh, oh, overflow detected!!!
76 Error("constant bigger than 64 bits detected!");
83 void LLLexer::HexToIntPair(const char *Buffer, const char *End,
86 for (int i=0; i<16; i++, Buffer++) {
87 assert(Buffer != End);
89 Pair[0] += parseHexChar(*Buffer);
92 for (int i=0; i<16 && Buffer != End; i++, Buffer++) {
94 Pair[1] += parseHexChar(*Buffer);
97 Error("constant bigger than 128 bits detected!");
100 /// FP80HexToIntPair - translate an 80 bit FP80 number (20 hexits) into
101 /// { low64, high16 } as usual for an APInt.
102 void LLLexer::FP80HexToIntPair(const char *Buffer, const char *End,
105 for (int i=0; i<4 && Buffer != End; i++, Buffer++) {
106 assert(Buffer != End);
108 Pair[1] += parseHexChar(*Buffer);
111 for (int i=0; i<16; i++, Buffer++) {
113 Pair[0] += parseHexChar(*Buffer);
116 Error("constant bigger than 128 bits detected!");
119 // UnEscapeLexed - Run through the specified buffer and change \xx codes to the
120 // appropriate character.
121 static void UnEscapeLexed(std::string &Str) {
122 if (Str.empty()) return;
124 char *Buffer = &Str[0], *EndBuffer = Buffer+Str.size();
126 for (char *BIn = Buffer; BIn != EndBuffer; ) {
127 if (BIn[0] == '\\') {
128 if (BIn < EndBuffer-1 && BIn[1] == '\\') {
129 *BOut++ = '\\'; // Two \ becomes one
131 } else if (BIn < EndBuffer-2 && isxdigit(BIn[1]) && isxdigit(BIn[2])) {
132 *BOut = parseHexChar(BIn[1]) * 16 + parseHexChar(BIn[2]);
133 BIn += 3; // Skip over handled chars
142 Str.resize(BOut-Buffer);
145 /// isLabelChar - Return true for [-a-zA-Z$._0-9].
146 static bool isLabelChar(char C) {
147 return isalnum(C) || C == '-' || C == '$' || C == '.' || C == '_';
151 /// isLabelTail - Return true if this pointer points to a valid end of a label.
152 static const char *isLabelTail(const char *CurPtr) {
154 if (CurPtr[0] == ':') return CurPtr+1;
155 if (!isLabelChar(CurPtr[0])) return 0;
162 //===----------------------------------------------------------------------===//
164 //===----------------------------------------------------------------------===//
166 LLLexer::LLLexer(MemoryBuffer *StartBuf, SourceMgr &sm, SMDiagnostic &Err,
168 : CurBuf(StartBuf), ErrorInfo(Err), SM(sm), Context(C), APFloatVal(0.0) {
169 CurPtr = CurBuf->getBufferStart();
172 std::string LLLexer::getFilename() const {
173 return CurBuf->getBufferIdentifier();
176 int LLLexer::getNextChar() {
177 char CurChar = *CurPtr++;
179 default: return (unsigned char)CurChar;
181 // A nul character in the stream is either the end of the current buffer or
182 // a random nul in the file. Disambiguate that here.
183 if (CurPtr-1 != CurBuf->getBufferEnd())
184 return 0; // Just whitespace.
186 // Otherwise, return end of file.
187 --CurPtr; // Another call to lex will return EOF again.
193 lltok::Kind LLLexer::LexToken() {
196 int CurChar = getNextChar();
199 // Handle letters: [a-zA-Z_]
200 if (isalpha(CurChar) || CurChar == '_')
201 return LexIdentifier();
204 case EOF: return lltok::Eof;
210 // Ignore whitespace.
212 case '+': return LexPositive();
213 case '@': return LexAt();
214 case '%': return LexPercent();
215 case '"': return LexQuote();
217 if (const char *Ptr = isLabelTail(CurPtr)) {
219 StrVal.assign(TokStart, CurPtr-1);
220 return lltok::LabelStr;
222 if (CurPtr[0] == '.' && CurPtr[1] == '.') {
224 return lltok::dotdotdot;
228 if (const char *Ptr = isLabelTail(CurPtr)) {
230 StrVal.assign(TokStart, CurPtr-1);
231 return lltok::LabelStr;
237 case '!': return LexExclaim();
238 case '0': case '1': case '2': case '3': case '4':
239 case '5': case '6': case '7': case '8': case '9':
241 return LexDigitOrNegative();
242 case '=': return lltok::equal;
243 case '[': return lltok::lsquare;
244 case ']': return lltok::rsquare;
245 case '{': return lltok::lbrace;
246 case '}': return lltok::rbrace;
247 case '<': return lltok::less;
248 case '>': return lltok::greater;
249 case '(': return lltok::lparen;
250 case ')': return lltok::rparen;
251 case ',': return lltok::comma;
252 case '*': return lltok::star;
253 case '\\': return lltok::backslash;
257 void LLLexer::SkipLineComment() {
259 if (CurPtr[0] == '\n' || CurPtr[0] == '\r' || getNextChar() == EOF)
264 /// LexAt - Lex all tokens that start with an @ character:
265 /// GlobalVar @\"[^\"]*\"
266 /// GlobalVar @[-a-zA-Z$._][-a-zA-Z$._0-9]*
267 /// GlobalVarID @[0-9]+
268 lltok::Kind LLLexer::LexAt() {
269 // Handle AtStringConstant: @\"[^\"]*\"
270 if (CurPtr[0] == '"') {
274 int CurChar = getNextChar();
276 if (CurChar == EOF) {
277 Error("end of file in global variable name");
280 if (CurChar == '"') {
281 StrVal.assign(TokStart+2, CurPtr-1);
282 UnEscapeLexed(StrVal);
283 return lltok::GlobalVar;
288 // Handle GlobalVarName: @[-a-zA-Z$._][-a-zA-Z$._0-9]*
290 return lltok::GlobalVar;
292 // Handle GlobalVarID: @[0-9]+
293 if (isdigit(CurPtr[0])) {
294 for (++CurPtr; isdigit(CurPtr[0]); ++CurPtr)
297 uint64_t Val = atoull(TokStart+1, CurPtr);
298 if ((unsigned)Val != Val)
299 Error("invalid value number (too large)!");
300 UIntVal = unsigned(Val);
301 return lltok::GlobalID;
307 /// ReadString - Read a string until the closing quote.
308 lltok::Kind LLLexer::ReadString(lltok::Kind kind) {
309 const char *Start = CurPtr;
311 int CurChar = getNextChar();
313 if (CurChar == EOF) {
314 Error("end of file in string constant");
317 if (CurChar == '"') {
318 StrVal.assign(Start, CurPtr-1);
319 UnEscapeLexed(StrVal);
325 /// ReadVarName - Read the rest of a token containing a variable name.
326 bool LLLexer::ReadVarName() {
327 const char *NameStart = CurPtr;
328 if (isalpha(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
329 CurPtr[0] == '.' || CurPtr[0] == '_') {
331 while (isalnum(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
332 CurPtr[0] == '.' || CurPtr[0] == '_')
335 StrVal.assign(NameStart, CurPtr);
341 /// LexPercent - Lex all tokens that start with a % character:
342 /// LocalVar ::= %\"[^\"]*\"
343 /// LocalVar ::= %[-a-zA-Z$._][-a-zA-Z$._0-9]*
344 /// LocalVarID ::= %[0-9]+
345 lltok::Kind LLLexer::LexPercent() {
346 // Handle LocalVarName: %\"[^\"]*\"
347 if (CurPtr[0] == '"') {
349 return ReadString(lltok::LocalVar);
352 // Handle LocalVarName: %[-a-zA-Z$._][-a-zA-Z$._0-9]*
354 return lltok::LocalVar;
356 // Handle LocalVarID: %[0-9]+
357 if (isdigit(CurPtr[0])) {
358 for (++CurPtr; isdigit(CurPtr[0]); ++CurPtr)
361 uint64_t Val = atoull(TokStart+1, CurPtr);
362 if ((unsigned)Val != Val)
363 Error("invalid value number (too large)!");
364 UIntVal = unsigned(Val);
365 return lltok::LocalVarID;
371 /// LexQuote - Lex all tokens that start with a " character:
372 /// QuoteLabel "[^"]+":
373 /// StringConstant "[^"]*"
374 lltok::Kind LLLexer::LexQuote() {
375 lltok::Kind kind = ReadString(lltok::StringConstant);
376 if (kind == lltok::Error || kind == lltok::Eof)
379 if (CurPtr[0] == ':') {
381 kind = lltok::LabelStr;
390 lltok::Kind LLLexer::LexExclaim() {
391 // Lex a metadata name as a MetadataVar.
392 if (isalpha(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
393 CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\') {
395 while (isalnum(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
396 CurPtr[0] == '.' || CurPtr[0] == '_' || CurPtr[0] == '\\')
399 StrVal.assign(TokStart+1, CurPtr); // Skip !
400 UnEscapeLexed(StrVal);
401 return lltok::MetadataVar;
403 return lltok::exclaim;
406 /// LexIdentifier: Handle several related productions:
407 /// Label [-a-zA-Z$._0-9]+:
408 /// IntegerType i[0-9]+
409 /// Keyword sdiv, float, ...
410 /// HexIntConstant [us]0x[0-9A-Fa-f]+
411 lltok::Kind LLLexer::LexIdentifier() {
412 const char *StartChar = CurPtr;
413 const char *IntEnd = CurPtr[-1] == 'i' ? 0 : StartChar;
414 const char *KeywordEnd = 0;
416 for (; isLabelChar(*CurPtr); ++CurPtr) {
417 // If we decide this is an integer, remember the end of the sequence.
418 if (!IntEnd && !isdigit(*CurPtr)) IntEnd = CurPtr;
419 if (!KeywordEnd && !isalnum(*CurPtr) && *CurPtr != '_') KeywordEnd = CurPtr;
422 // If we stopped due to a colon, this really is a label.
423 if (*CurPtr == ':') {
424 StrVal.assign(StartChar-1, CurPtr++);
425 return lltok::LabelStr;
428 // Otherwise, this wasn't a label. If this was valid as an integer type,
430 if (IntEnd == 0) IntEnd = CurPtr;
431 if (IntEnd != StartChar) {
433 uint64_t NumBits = atoull(StartChar, CurPtr);
434 if (NumBits < IntegerType::MIN_INT_BITS ||
435 NumBits > IntegerType::MAX_INT_BITS) {
436 Error("bitwidth for integer type out of range!");
439 TyVal = IntegerType::get(Context, NumBits);
443 // Otherwise, this was a letter sequence. See which keyword this is.
444 if (KeywordEnd == 0) KeywordEnd = CurPtr;
447 unsigned Len = CurPtr-StartChar;
448 #define KEYWORD(STR) \
449 if (Len == strlen(#STR) && !memcmp(StartChar, #STR, strlen(#STR))) \
450 return lltok::kw_##STR;
452 KEYWORD(true); KEYWORD(false);
453 KEYWORD(declare); KEYWORD(define);
454 KEYWORD(global); KEYWORD(constant);
457 KEYWORD(linker_private);
458 KEYWORD(linker_private_weak);
459 KEYWORD(linker_private_weak_def_auto);
461 KEYWORD(available_externally);
463 KEYWORD(linkonce_odr);
473 KEYWORD(unnamed_addr);
474 KEYWORD(extern_weak);
476 KEYWORD(thread_local);
477 KEYWORD(zeroinitializer);
495 KEYWORD(singlethread);
514 KEYWORD(x86_stdcallcc);
515 KEYWORD(x86_fastcallcc);
516 KEYWORD(x86_thiscallcc);
518 KEYWORD(arm_aapcscc);
519 KEYWORD(arm_aapcs_vfpcc);
520 KEYWORD(msp430_intrcc);
540 KEYWORD(returns_twice);
544 KEYWORD(alwaysinline);
549 KEYWORD(noimplicitfloat);
551 KEYWORD(nonlazybind);
552 KEYWORD(address_safety);
557 KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
558 KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);
559 KEYWORD(oeq); KEYWORD(one); KEYWORD(olt); KEYWORD(ogt); KEYWORD(ole);
560 KEYWORD(oge); KEYWORD(ord); KEYWORD(uno); KEYWORD(ueq); KEYWORD(une);
562 KEYWORD(xchg); KEYWORD(nand); KEYWORD(max); KEYWORD(min); KEYWORD(umax);
566 KEYWORD(blockaddress);
568 KEYWORD(personality);
574 // Keywords for types.
575 #define TYPEKEYWORD(STR, LLVMTY) \
576 if (Len == strlen(STR) && !memcmp(StartChar, STR, strlen(STR))) { \
577 TyVal = LLVMTY; return lltok::Type; }
578 TYPEKEYWORD("void", Type::getVoidTy(Context));
579 TYPEKEYWORD("half", Type::getHalfTy(Context));
580 TYPEKEYWORD("float", Type::getFloatTy(Context));
581 TYPEKEYWORD("double", Type::getDoubleTy(Context));
582 TYPEKEYWORD("x86_fp80", Type::getX86_FP80Ty(Context));
583 TYPEKEYWORD("fp128", Type::getFP128Ty(Context));
584 TYPEKEYWORD("ppc_fp128", Type::getPPC_FP128Ty(Context));
585 TYPEKEYWORD("label", Type::getLabelTy(Context));
586 TYPEKEYWORD("metadata", Type::getMetadataTy(Context));
587 TYPEKEYWORD("x86_mmx", Type::getX86_MMXTy(Context));
590 // Keywords for instructions.
591 #define INSTKEYWORD(STR, Enum) \
592 if (Len == strlen(#STR) && !memcmp(StartChar, #STR, strlen(#STR))) { \
593 UIntVal = Instruction::Enum; return lltok::kw_##STR; }
595 INSTKEYWORD(add, Add); INSTKEYWORD(fadd, FAdd);
596 INSTKEYWORD(sub, Sub); INSTKEYWORD(fsub, FSub);
597 INSTKEYWORD(mul, Mul); INSTKEYWORD(fmul, FMul);
598 INSTKEYWORD(udiv, UDiv); INSTKEYWORD(sdiv, SDiv); INSTKEYWORD(fdiv, FDiv);
599 INSTKEYWORD(urem, URem); INSTKEYWORD(srem, SRem); INSTKEYWORD(frem, FRem);
600 INSTKEYWORD(shl, Shl); INSTKEYWORD(lshr, LShr); INSTKEYWORD(ashr, AShr);
601 INSTKEYWORD(and, And); INSTKEYWORD(or, Or); INSTKEYWORD(xor, Xor);
602 INSTKEYWORD(icmp, ICmp); INSTKEYWORD(fcmp, FCmp);
604 INSTKEYWORD(phi, PHI);
605 INSTKEYWORD(call, Call);
606 INSTKEYWORD(trunc, Trunc);
607 INSTKEYWORD(zext, ZExt);
608 INSTKEYWORD(sext, SExt);
609 INSTKEYWORD(fptrunc, FPTrunc);
610 INSTKEYWORD(fpext, FPExt);
611 INSTKEYWORD(uitofp, UIToFP);
612 INSTKEYWORD(sitofp, SIToFP);
613 INSTKEYWORD(fptoui, FPToUI);
614 INSTKEYWORD(fptosi, FPToSI);
615 INSTKEYWORD(inttoptr, IntToPtr);
616 INSTKEYWORD(ptrtoint, PtrToInt);
617 INSTKEYWORD(bitcast, BitCast);
618 INSTKEYWORD(select, Select);
619 INSTKEYWORD(va_arg, VAArg);
620 INSTKEYWORD(ret, Ret);
622 INSTKEYWORD(switch, Switch);
623 INSTKEYWORD(indirectbr, IndirectBr);
624 INSTKEYWORD(invoke, Invoke);
625 INSTKEYWORD(resume, Resume);
626 INSTKEYWORD(unreachable, Unreachable);
628 INSTKEYWORD(alloca, Alloca);
629 INSTKEYWORD(load, Load);
630 INSTKEYWORD(store, Store);
631 INSTKEYWORD(cmpxchg, AtomicCmpXchg);
632 INSTKEYWORD(atomicrmw, AtomicRMW);
633 INSTKEYWORD(fence, Fence);
634 INSTKEYWORD(getelementptr, GetElementPtr);
636 INSTKEYWORD(extractelement, ExtractElement);
637 INSTKEYWORD(insertelement, InsertElement);
638 INSTKEYWORD(shufflevector, ShuffleVector);
639 INSTKEYWORD(extractvalue, ExtractValue);
640 INSTKEYWORD(insertvalue, InsertValue);
641 INSTKEYWORD(landingpad, LandingPad);
644 // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
645 // the CFE to avoid forcing it to deal with 64-bit numbers.
646 if ((TokStart[0] == 'u' || TokStart[0] == 's') &&
647 TokStart[1] == '0' && TokStart[2] == 'x' && isxdigit(TokStart[3])) {
648 int len = CurPtr-TokStart-3;
649 uint32_t bits = len * 4;
650 APInt Tmp(bits, StringRef(TokStart+3, len), 16);
651 uint32_t activeBits = Tmp.getActiveBits();
652 if (activeBits > 0 && activeBits < bits)
653 Tmp = Tmp.trunc(activeBits);
654 APSIntVal = APSInt(Tmp, TokStart[0] == 'u');
655 return lltok::APSInt;
658 // If this is "cc1234", return this as just "cc".
659 if (TokStart[0] == 'c' && TokStart[1] == 'c') {
664 // Finally, if this isn't known, return an error.
670 /// Lex0x: Handle productions that start with 0x, knowing that it matches and
671 /// that this is not a label:
672 /// HexFPConstant 0x[0-9A-Fa-f]+
673 /// HexFP80Constant 0xK[0-9A-Fa-f]+
674 /// HexFP128Constant 0xL[0-9A-Fa-f]+
675 /// HexPPC128Constant 0xM[0-9A-Fa-f]+
676 lltok::Kind LLLexer::Lex0x() {
677 CurPtr = TokStart + 2;
680 if (CurPtr[0] >= 'K' && CurPtr[0] <= 'M') {
686 if (!isxdigit(CurPtr[0])) {
687 // Bad token, return it as an error.
692 while (isxdigit(CurPtr[0]))
696 // HexFPConstant - Floating point constant represented in IEEE format as a
697 // hexadecimal number for when exponential notation is not precise enough.
698 // Half, Float, and double only.
699 APFloatVal = APFloat(BitsToDouble(HexIntToVal(TokStart+2, CurPtr)));
700 return lltok::APFloat;
705 default: llvm_unreachable("Unknown kind!");
707 // F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
708 FP80HexToIntPair(TokStart+3, CurPtr, Pair);
709 APFloatVal = APFloat(APInt(80, Pair));
710 return lltok::APFloat;
712 // F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
713 HexToIntPair(TokStart+3, CurPtr, Pair);
714 APFloatVal = APFloat(APInt(128, Pair), true);
715 return lltok::APFloat;
717 // PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
718 HexToIntPair(TokStart+3, CurPtr, Pair);
719 APFloatVal = APFloat(APInt(128, Pair));
720 return lltok::APFloat;
724 /// LexIdentifier: Handle several related productions:
725 /// Label [-a-zA-Z$._0-9]+:
727 /// FPConstant [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
729 /// HexFPConstant 0x[0-9A-Fa-f]+
730 /// HexFP80Constant 0xK[0-9A-Fa-f]+
731 /// HexFP128Constant 0xL[0-9A-Fa-f]+
732 /// HexPPC128Constant 0xM[0-9A-Fa-f]+
733 lltok::Kind LLLexer::LexDigitOrNegative() {
734 // If the letter after the negative is a number, this is probably a label.
735 if (!isdigit(TokStart[0]) && !isdigit(CurPtr[0])) {
736 // Okay, this is not a number after the -, it's probably a label.
737 if (const char *End = isLabelTail(CurPtr)) {
738 StrVal.assign(TokStart, End-1);
740 return lltok::LabelStr;
746 // At this point, it is either a label, int or fp constant.
748 // Skip digits, we have at least one.
749 for (; isdigit(CurPtr[0]); ++CurPtr)
752 // Check to see if this really is a label afterall, e.g. "-1:".
753 if (isLabelChar(CurPtr[0]) || CurPtr[0] == ':') {
754 if (const char *End = isLabelTail(CurPtr)) {
755 StrVal.assign(TokStart, End-1);
757 return lltok::LabelStr;
761 // If the next character is a '.', then it is a fp value, otherwise its
763 if (CurPtr[0] != '.') {
764 if (TokStart[0] == '0' && TokStart[1] == 'x')
766 unsigned Len = CurPtr-TokStart;
767 uint32_t numBits = ((Len * 64) / 19) + 2;
768 APInt Tmp(numBits, StringRef(TokStart, Len), 10);
769 if (TokStart[0] == '-') {
770 uint32_t minBits = Tmp.getMinSignedBits();
771 if (minBits > 0 && minBits < numBits)
772 Tmp = Tmp.trunc(minBits);
773 APSIntVal = APSInt(Tmp, false);
775 uint32_t activeBits = Tmp.getActiveBits();
776 if (activeBits > 0 && activeBits < numBits)
777 Tmp = Tmp.trunc(activeBits);
778 APSIntVal = APSInt(Tmp, true);
780 return lltok::APSInt;
785 // Skip over [0-9]*([eE][-+]?[0-9]+)?
786 while (isdigit(CurPtr[0])) ++CurPtr;
788 if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
789 if (isdigit(CurPtr[1]) ||
790 ((CurPtr[1] == '-' || CurPtr[1] == '+') && isdigit(CurPtr[2]))) {
792 while (isdigit(CurPtr[0])) ++CurPtr;
796 APFloatVal = APFloat(std::atof(TokStart));
797 return lltok::APFloat;
800 /// FPConstant [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
801 lltok::Kind LLLexer::LexPositive() {
802 // If the letter after the negative is a number, this is probably not a
804 if (!isdigit(CurPtr[0]))
808 for (++CurPtr; isdigit(CurPtr[0]); ++CurPtr)
811 // At this point, we need a '.'.
812 if (CurPtr[0] != '.') {
819 // Skip over [0-9]*([eE][-+]?[0-9]+)?
820 while (isdigit(CurPtr[0])) ++CurPtr;
822 if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
823 if (isdigit(CurPtr[1]) ||
824 ((CurPtr[1] == '-' || CurPtr[1] == '+') && isdigit(CurPtr[2]))) {
826 while (isdigit(CurPtr[0])) ++CurPtr;
830 APFloatVal = APFloat(std::atof(TokStart));
831 return lltok::APFloat;