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/Support/ErrorHandling.h"
19 #include "llvm/Support/MemoryBuffer.h"
20 #include "llvm/Support/MathExtras.h"
21 #include "llvm/Support/SourceMgr.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include "llvm/Assembly/Parser.h"
28 bool LLLexer::Error(LocTy ErrorLoc, const std::string &Msg) const {
29 ErrorInfo = SM.GetMessage(ErrorLoc, Msg, "error");
33 //===----------------------------------------------------------------------===//
35 //===----------------------------------------------------------------------===//
37 // atoull - Convert an ascii string of decimal digits into the unsigned long
38 // long representation... this does not have to do input error checking,
39 // because we know that the input will be matched by a suitable regex...
41 uint64_t LLLexer::atoull(const char *Buffer, const char *End) {
43 for (; Buffer != End; Buffer++) {
44 uint64_t OldRes = Result;
46 Result += *Buffer-'0';
47 if (Result < OldRes) { // Uh, oh, overflow detected!!!
48 Error("constant bigger than 64 bits detected!");
55 uint64_t LLLexer::HexIntToVal(const char *Buffer, const char *End) {
57 for (; Buffer != End; ++Buffer) {
58 uint64_t OldRes = Result;
61 if (C >= '0' && C <= '9')
63 else if (C >= 'A' && C <= 'F')
65 else if (C >= 'a' && C <= 'f')
68 if (Result < OldRes) { // Uh, oh, overflow detected!!!
69 Error("constant bigger than 64 bits detected!");
76 void LLLexer::HexToIntPair(const char *Buffer, const char *End,
79 for (int i=0; i<16; i++, Buffer++) {
80 assert(Buffer != End);
83 if (C >= '0' && C <= '9')
85 else if (C >= 'A' && C <= 'F')
87 else if (C >= 'a' && C <= 'f')
91 for (int i=0; i<16 && Buffer != End; i++, Buffer++) {
94 if (C >= '0' && C <= '9')
96 else if (C >= 'A' && C <= 'F')
98 else if (C >= 'a' && C <= 'f')
102 Error("constant bigger than 128 bits detected!");
105 /// FP80HexToIntPair - translate an 80 bit FP80 number (20 hexits) into
106 /// { low64, high16 } as usual for an APInt.
107 void LLLexer::FP80HexToIntPair(const char *Buffer, const char *End,
110 for (int i=0; i<4 && Buffer != End; i++, Buffer++) {
111 assert(Buffer != End);
114 if (C >= '0' && C <= '9')
116 else if (C >= 'A' && C <= 'F')
118 else if (C >= 'a' && C <= 'f')
122 for (int i=0; i<16; i++, Buffer++) {
125 if (C >= '0' && C <= '9')
127 else if (C >= 'A' && C <= 'F')
129 else if (C >= 'a' && C <= 'f')
133 Error("constant bigger than 128 bits detected!");
136 // UnEscapeLexed - Run through the specified buffer and change \xx codes to the
137 // appropriate character.
138 static void UnEscapeLexed(std::string &Str) {
139 if (Str.empty()) return;
141 char *Buffer = &Str[0], *EndBuffer = Buffer+Str.size();
143 for (char *BIn = Buffer; BIn != EndBuffer; ) {
144 if (BIn[0] == '\\') {
145 if (BIn < EndBuffer-1 && BIn[1] == '\\') {
146 *BOut++ = '\\'; // Two \ becomes one
148 } else if (BIn < EndBuffer-2 && isxdigit(BIn[1]) && isxdigit(BIn[2])) {
149 char Tmp = BIn[3]; BIn[3] = 0; // Terminate string
150 *BOut = (char)strtol(BIn+1, 0, 16); // Convert to number
151 BIn[3] = Tmp; // Restore character
152 BIn += 3; // Skip over handled chars
161 Str.resize(BOut-Buffer);
164 /// isLabelChar - Return true for [-a-zA-Z$._0-9].
165 static bool isLabelChar(char C) {
166 return isalnum(C) || C == '-' || C == '$' || C == '.' || C == '_';
170 /// isLabelTail - Return true if this pointer points to a valid end of a label.
171 static const char *isLabelTail(const char *CurPtr) {
173 if (CurPtr[0] == ':') return CurPtr+1;
174 if (!isLabelChar(CurPtr[0])) return 0;
181 //===----------------------------------------------------------------------===//
183 //===----------------------------------------------------------------------===//
185 LLLexer::LLLexer(MemoryBuffer *StartBuf, SourceMgr &sm, SMDiagnostic &Err,
187 : CurBuf(StartBuf), ErrorInfo(Err), SM(sm), Context(C), APFloatVal(0.0) {
188 CurPtr = CurBuf->getBufferStart();
191 std::string LLLexer::getFilename() const {
192 return CurBuf->getBufferIdentifier();
195 int LLLexer::getNextChar() {
196 char CurChar = *CurPtr++;
198 default: return (unsigned char)CurChar;
200 // A nul character in the stream is either the end of the current buffer or
201 // a random nul in the file. Disambiguate that here.
202 if (CurPtr-1 != CurBuf->getBufferEnd())
203 return 0; // Just whitespace.
205 // Otherwise, return end of file.
206 --CurPtr; // Another call to lex will return EOF again.
212 lltok::Kind LLLexer::LexToken() {
215 int CurChar = getNextChar();
218 // Handle letters: [a-zA-Z_]
219 if (isalpha(CurChar) || CurChar == '_')
220 return LexIdentifier();
223 case EOF: return lltok::Eof;
229 // Ignore whitespace.
231 case '+': return LexPositive();
232 case '@': return LexAt();
233 case '%': return LexPercent();
234 case '"': return LexQuote();
236 if (const char *Ptr = isLabelTail(CurPtr)) {
238 StrVal.assign(TokStart, CurPtr-1);
239 return lltok::LabelStr;
241 if (CurPtr[0] == '.' && CurPtr[1] == '.') {
243 return lltok::dotdotdot;
247 if (const char *Ptr = isLabelTail(CurPtr)) {
249 StrVal.assign(TokStart, CurPtr-1);
250 return lltok::LabelStr;
256 case '!': return lltok::Metadata;
257 case '0': case '1': case '2': case '3': case '4':
258 case '5': case '6': case '7': case '8': case '9':
260 return LexDigitOrNegative();
261 case '=': return lltok::equal;
262 case '[': return lltok::lsquare;
263 case ']': return lltok::rsquare;
264 case '{': return lltok::lbrace;
265 case '}': return lltok::rbrace;
266 case '<': return lltok::less;
267 case '>': return lltok::greater;
268 case '(': return lltok::lparen;
269 case ')': return lltok::rparen;
270 case ',': return lltok::comma;
271 case '*': return lltok::star;
272 case '\\': return lltok::backslash;
276 void LLLexer::SkipLineComment() {
278 if (CurPtr[0] == '\n' || CurPtr[0] == '\r' || getNextChar() == EOF)
283 /// LexAt - Lex all tokens that start with an @ character:
284 /// GlobalVar @\"[^\"]*\"
285 /// GlobalVar @[-a-zA-Z$._][-a-zA-Z$._0-9]*
286 /// GlobalVarID @[0-9]+
287 lltok::Kind LLLexer::LexAt() {
288 // Handle AtStringConstant: @\"[^\"]*\"
289 if (CurPtr[0] == '"') {
293 int CurChar = getNextChar();
295 if (CurChar == EOF) {
296 Error("end of file in global variable name");
299 if (CurChar == '"') {
300 StrVal.assign(TokStart+2, CurPtr-1);
301 UnEscapeLexed(StrVal);
302 return lltok::GlobalVar;
307 // Handle GlobalVarName: @[-a-zA-Z$._][-a-zA-Z$._0-9]*
308 if (isalpha(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
309 CurPtr[0] == '.' || CurPtr[0] == '_') {
311 while (isalnum(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
312 CurPtr[0] == '.' || CurPtr[0] == '_')
315 StrVal.assign(TokStart+1, CurPtr); // Skip @
316 return lltok::GlobalVar;
319 // Handle GlobalVarID: @[0-9]+
320 if (isdigit(CurPtr[0])) {
321 for (++CurPtr; isdigit(CurPtr[0]); ++CurPtr)
324 uint64_t Val = atoull(TokStart+1, CurPtr);
325 if ((unsigned)Val != Val)
326 Error("invalid value number (too large)!");
327 UIntVal = unsigned(Val);
328 return lltok::GlobalID;
335 /// LexPercent - Lex all tokens that start with a % character:
336 /// LocalVar ::= %\"[^\"]*\"
337 /// LocalVar ::= %[-a-zA-Z$._][-a-zA-Z$._0-9]*
338 /// LocalVarID ::= %[0-9]+
339 lltok::Kind LLLexer::LexPercent() {
340 // Handle LocalVarName: %\"[^\"]*\"
341 if (CurPtr[0] == '"') {
345 int CurChar = getNextChar();
347 if (CurChar == EOF) {
348 Error("end of file in string constant");
351 if (CurChar == '"') {
352 StrVal.assign(TokStart+2, CurPtr-1);
353 UnEscapeLexed(StrVal);
354 return lltok::LocalVar;
359 // Handle LocalVarName: %[-a-zA-Z$._][-a-zA-Z$._0-9]*
360 if (isalpha(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
361 CurPtr[0] == '.' || CurPtr[0] == '_') {
363 while (isalnum(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
364 CurPtr[0] == '.' || CurPtr[0] == '_')
367 StrVal.assign(TokStart+1, CurPtr); // Skip %
368 return lltok::LocalVar;
371 // Handle LocalVarID: %[0-9]+
372 if (isdigit(CurPtr[0])) {
373 for (++CurPtr; isdigit(CurPtr[0]); ++CurPtr)
376 uint64_t Val = atoull(TokStart+1, CurPtr);
377 if ((unsigned)Val != Val)
378 Error("invalid value number (too large)!");
379 UIntVal = unsigned(Val);
380 return lltok::LocalVarID;
386 /// LexQuote - Lex all tokens that start with a " character:
387 /// QuoteLabel "[^"]+":
388 /// StringConstant "[^"]*"
389 lltok::Kind LLLexer::LexQuote() {
391 int CurChar = getNextChar();
393 if (CurChar == EOF) {
394 Error("end of file in quoted string");
398 if (CurChar != '"') continue;
400 if (CurPtr[0] != ':') {
401 StrVal.assign(TokStart+1, CurPtr-1);
402 UnEscapeLexed(StrVal);
403 return lltok::StringConstant;
407 StrVal.assign(TokStart+1, CurPtr-2);
408 UnEscapeLexed(StrVal);
409 return lltok::LabelStr;
413 static bool JustWhitespaceNewLine(const char *&Ptr) {
414 const char *ThisPtr = Ptr;
415 while (*ThisPtr == ' ' || *ThisPtr == '\t')
417 if (*ThisPtr == '\n' || *ThisPtr == '\r') {
425 /// LexIdentifier: Handle several related productions:
426 /// Label [-a-zA-Z$._0-9]+:
427 /// IntegerType i[0-9]+
428 /// Keyword sdiv, float, ...
429 /// HexIntConstant [us]0x[0-9A-Fa-f]+
430 lltok::Kind LLLexer::LexIdentifier() {
431 const char *StartChar = CurPtr;
432 const char *IntEnd = CurPtr[-1] == 'i' ? 0 : StartChar;
433 const char *KeywordEnd = 0;
435 for (; isLabelChar(*CurPtr); ++CurPtr) {
436 // If we decide this is an integer, remember the end of the sequence.
437 if (!IntEnd && !isdigit(*CurPtr)) IntEnd = CurPtr;
438 if (!KeywordEnd && !isalnum(*CurPtr) && *CurPtr != '_') KeywordEnd = CurPtr;
441 // If we stopped due to a colon, this really is a label.
442 if (*CurPtr == ':') {
443 StrVal.assign(StartChar-1, CurPtr++);
444 return lltok::LabelStr;
447 // Otherwise, this wasn't a label. If this was valid as an integer type,
449 if (IntEnd == 0) IntEnd = CurPtr;
450 if (IntEnd != StartChar) {
452 uint64_t NumBits = atoull(StartChar, CurPtr);
453 if (NumBits < IntegerType::MIN_INT_BITS ||
454 NumBits > IntegerType::MAX_INT_BITS) {
455 Error("bitwidth for integer type out of range!");
458 TyVal = Context.getIntegerType(NumBits);
462 // Otherwise, this was a letter sequence. See which keyword this is.
463 if (KeywordEnd == 0) KeywordEnd = CurPtr;
466 unsigned Len = CurPtr-StartChar;
467 #define KEYWORD(STR) \
468 if (Len == strlen(#STR) && !memcmp(StartChar, #STR, strlen(#STR))) \
469 return lltok::kw_##STR;
471 KEYWORD(begin); KEYWORD(end);
472 KEYWORD(true); KEYWORD(false);
473 KEYWORD(declare); KEYWORD(define);
474 KEYWORD(global); KEYWORD(constant);
477 KEYWORD(linker_private);
479 KEYWORD(available_externally);
481 KEYWORD(linkonce_odr);
491 KEYWORD(extern_weak);
493 KEYWORD(thread_local);
494 KEYWORD(zeroinitializer);
520 KEYWORD(x86_stdcallcc);
521 KEYWORD(x86_fastcallcc);
523 KEYWORD(arm_aapcscc);
524 KEYWORD(arm_aapcs_vfpcc);
543 KEYWORD(alwaysinline);
548 KEYWORD(noimplicitfloat);
554 KEYWORD(eq); KEYWORD(ne); KEYWORD(slt); KEYWORD(sgt); KEYWORD(sle);
555 KEYWORD(sge); KEYWORD(ult); KEYWORD(ugt); KEYWORD(ule); KEYWORD(uge);
556 KEYWORD(oeq); KEYWORD(one); KEYWORD(olt); KEYWORD(ogt); KEYWORD(ole);
557 KEYWORD(oge); KEYWORD(ord); KEYWORD(uno); KEYWORD(ueq); KEYWORD(une);
562 // Keywords for types.
563 #define TYPEKEYWORD(STR, LLVMTY) \
564 if (Len == strlen(STR) && !memcmp(StartChar, STR, strlen(STR))) { \
565 TyVal = LLVMTY; return lltok::Type; }
566 TYPEKEYWORD("void", Type::VoidTy);
567 TYPEKEYWORD("float", Type::FloatTy);
568 TYPEKEYWORD("double", Type::DoubleTy);
569 TYPEKEYWORD("x86_fp80", Type::X86_FP80Ty);
570 TYPEKEYWORD("fp128", Type::FP128Ty);
571 TYPEKEYWORD("ppc_fp128", Type::PPC_FP128Ty);
572 TYPEKEYWORD("label", Type::LabelTy);
573 TYPEKEYWORD("metadata", Type::MetadataTy);
576 // Handle special forms for autoupgrading. Drop these in LLVM 3.0. This is
577 // to avoid conflicting with the sext/zext instructions, below.
578 if (Len == 4 && !memcmp(StartChar, "sext", 4)) {
579 // Scan CurPtr ahead, seeing if there is just whitespace before the newline.
580 if (JustWhitespaceNewLine(CurPtr))
581 return lltok::kw_signext;
582 } else if (Len == 4 && !memcmp(StartChar, "zext", 4)) {
583 // Scan CurPtr ahead, seeing if there is just whitespace before the newline.
584 if (JustWhitespaceNewLine(CurPtr))
585 return lltok::kw_zeroext;
588 // Keywords for instructions.
589 #define INSTKEYWORD(STR, Enum) \
590 if (Len == strlen(#STR) && !memcmp(StartChar, #STR, strlen(#STR))) { \
591 UIntVal = Instruction::Enum; return lltok::kw_##STR; }
593 INSTKEYWORD(add, Add); INSTKEYWORD(fadd, FAdd);
594 INSTKEYWORD(sub, Sub); INSTKEYWORD(fsub, FSub);
595 INSTKEYWORD(mul, Mul); INSTKEYWORD(fmul, FMul);
596 INSTKEYWORD(udiv, UDiv); INSTKEYWORD(sdiv, SDiv); INSTKEYWORD(fdiv, FDiv);
597 INSTKEYWORD(urem, URem); INSTKEYWORD(srem, SRem); INSTKEYWORD(frem, FRem);
598 INSTKEYWORD(shl, Shl); INSTKEYWORD(lshr, LShr); INSTKEYWORD(ashr, AShr);
599 INSTKEYWORD(and, And); INSTKEYWORD(or, Or); INSTKEYWORD(xor, Xor);
600 INSTKEYWORD(icmp, ICmp); INSTKEYWORD(fcmp, FCmp);
602 INSTKEYWORD(phi, PHI);
603 INSTKEYWORD(call, Call);
604 INSTKEYWORD(trunc, Trunc);
605 INSTKEYWORD(zext, ZExt);
606 INSTKEYWORD(sext, SExt);
607 INSTKEYWORD(fptrunc, FPTrunc);
608 INSTKEYWORD(fpext, FPExt);
609 INSTKEYWORD(uitofp, UIToFP);
610 INSTKEYWORD(sitofp, SIToFP);
611 INSTKEYWORD(fptoui, FPToUI);
612 INSTKEYWORD(fptosi, FPToSI);
613 INSTKEYWORD(inttoptr, IntToPtr);
614 INSTKEYWORD(ptrtoint, PtrToInt);
615 INSTKEYWORD(bitcast, BitCast);
616 INSTKEYWORD(select, Select);
617 INSTKEYWORD(va_arg, VAArg);
618 INSTKEYWORD(ret, Ret);
620 INSTKEYWORD(switch, Switch);
621 INSTKEYWORD(invoke, Invoke);
622 INSTKEYWORD(unwind, Unwind);
623 INSTKEYWORD(unreachable, Unreachable);
625 INSTKEYWORD(malloc, Malloc);
626 INSTKEYWORD(alloca, Alloca);
627 INSTKEYWORD(free, Free);
628 INSTKEYWORD(load, Load);
629 INSTKEYWORD(store, Store);
630 INSTKEYWORD(getelementptr, GetElementPtr);
632 INSTKEYWORD(extractelement, ExtractElement);
633 INSTKEYWORD(insertelement, InsertElement);
634 INSTKEYWORD(shufflevector, ShuffleVector);
635 INSTKEYWORD(getresult, ExtractValue);
636 INSTKEYWORD(extractvalue, ExtractValue);
637 INSTKEYWORD(insertvalue, InsertValue);
640 // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
641 // the CFE to avoid forcing it to deal with 64-bit numbers.
642 if ((TokStart[0] == 'u' || TokStart[0] == 's') &&
643 TokStart[1] == '0' && TokStart[2] == 'x' && isxdigit(TokStart[3])) {
644 int len = CurPtr-TokStart-3;
645 uint32_t bits = len * 4;
646 APInt Tmp(bits, TokStart+3, len, 16);
647 uint32_t activeBits = Tmp.getActiveBits();
648 if (activeBits > 0 && activeBits < bits)
649 Tmp.trunc(activeBits);
650 APSIntVal = APSInt(Tmp, TokStart[0] == 'u');
651 return lltok::APSInt;
654 // If this is "cc1234", return this as just "cc".
655 if (TokStart[0] == 'c' && TokStart[1] == 'c') {
660 // If this starts with "call", return it as CALL. This is to support old
661 // broken .ll files. FIXME: remove this with LLVM 3.0.
662 if (CurPtr-TokStart > 4 && !memcmp(TokStart, "call", 4)) {
664 UIntVal = Instruction::Call;
665 return lltok::kw_call;
668 // Finally, if this isn't known, return an error.
674 /// Lex0x: Handle productions that start with 0x, knowing that it matches and
675 /// that this is not a label:
676 /// HexFPConstant 0x[0-9A-Fa-f]+
677 /// HexFP80Constant 0xK[0-9A-Fa-f]+
678 /// HexFP128Constant 0xL[0-9A-Fa-f]+
679 /// HexPPC128Constant 0xM[0-9A-Fa-f]+
680 lltok::Kind LLLexer::Lex0x() {
681 CurPtr = TokStart + 2;
684 if (CurPtr[0] >= 'K' && CurPtr[0] <= 'M') {
690 if (!isxdigit(CurPtr[0])) {
691 // Bad token, return it as an error.
696 while (isxdigit(CurPtr[0]))
700 // HexFPConstant - Floating point constant represented in IEEE format as a
701 // hexadecimal number for when exponential notation is not precise enough.
702 // Float and double only.
703 APFloatVal = APFloat(BitsToDouble(HexIntToVal(TokStart+2, CurPtr)));
704 return lltok::APFloat;
709 default: llvm_unreachable("Unknown kind!");
711 // F80HexFPConstant - x87 long double in hexadecimal format (10 bytes)
712 FP80HexToIntPair(TokStart+3, CurPtr, Pair);
713 APFloatVal = APFloat(APInt(80, 2, Pair));
714 return lltok::APFloat;
716 // F128HexFPConstant - IEEE 128-bit in hexadecimal format (16 bytes)
717 HexToIntPair(TokStart+3, CurPtr, Pair);
718 APFloatVal = APFloat(APInt(128, 2, Pair), true);
719 return lltok::APFloat;
721 // PPC128HexFPConstant - PowerPC 128-bit in hexadecimal format (16 bytes)
722 HexToIntPair(TokStart+3, CurPtr, Pair);
723 APFloatVal = APFloat(APInt(128, 2, Pair));
724 return lltok::APFloat;
728 /// LexIdentifier: Handle several related productions:
729 /// Label [-a-zA-Z$._0-9]+:
731 /// FPConstant [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
733 /// HexFPConstant 0x[0-9A-Fa-f]+
734 /// HexFP80Constant 0xK[0-9A-Fa-f]+
735 /// HexFP128Constant 0xL[0-9A-Fa-f]+
736 /// HexPPC128Constant 0xM[0-9A-Fa-f]+
737 lltok::Kind LLLexer::LexDigitOrNegative() {
738 // If the letter after the negative is a number, this is probably a label.
739 if (!isdigit(TokStart[0]) && !isdigit(CurPtr[0])) {
740 // Okay, this is not a number after the -, it's probably a label.
741 if (const char *End = isLabelTail(CurPtr)) {
742 StrVal.assign(TokStart, End-1);
744 return lltok::LabelStr;
750 // At this point, it is either a label, int or fp constant.
752 // Skip digits, we have at least one.
753 for (; isdigit(CurPtr[0]); ++CurPtr)
756 // Check to see if this really is a label afterall, e.g. "-1:".
757 if (isLabelChar(CurPtr[0]) || CurPtr[0] == ':') {
758 if (const char *End = isLabelTail(CurPtr)) {
759 StrVal.assign(TokStart, End-1);
761 return lltok::LabelStr;
765 // If the next character is a '.', then it is a fp value, otherwise its
767 if (CurPtr[0] != '.') {
768 if (TokStart[0] == '0' && TokStart[1] == 'x')
770 unsigned Len = CurPtr-TokStart;
771 uint32_t numBits = ((Len * 64) / 19) + 2;
772 APInt Tmp(numBits, TokStart, Len, 10);
773 if (TokStart[0] == '-') {
774 uint32_t minBits = Tmp.getMinSignedBits();
775 if (minBits > 0 && minBits < numBits)
777 APSIntVal = APSInt(Tmp, false);
779 uint32_t activeBits = Tmp.getActiveBits();
780 if (activeBits > 0 && activeBits < numBits)
781 Tmp.trunc(activeBits);
782 APSIntVal = APSInt(Tmp, true);
784 return lltok::APSInt;
789 // Skip over [0-9]*([eE][-+]?[0-9]+)?
790 while (isdigit(CurPtr[0])) ++CurPtr;
792 if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
793 if (isdigit(CurPtr[1]) ||
794 ((CurPtr[1] == '-' || CurPtr[1] == '+') && isdigit(CurPtr[2]))) {
796 while (isdigit(CurPtr[0])) ++CurPtr;
800 APFloatVal = APFloat(atof(TokStart));
801 return lltok::APFloat;
804 /// FPConstant [-+]?[0-9]+[.][0-9]*([eE][-+]?[0-9]+)?
805 lltok::Kind LLLexer::LexPositive() {
806 // If the letter after the negative is a number, this is probably not a
808 if (!isdigit(CurPtr[0]))
812 for (++CurPtr; isdigit(CurPtr[0]); ++CurPtr)
815 // At this point, we need a '.'.
816 if (CurPtr[0] != '.') {
823 // Skip over [0-9]*([eE][-+]?[0-9]+)?
824 while (isdigit(CurPtr[0])) ++CurPtr;
826 if (CurPtr[0] == 'e' || CurPtr[0] == 'E') {
827 if (isdigit(CurPtr[1]) ||
828 ((CurPtr[1] == '-' || CurPtr[1] == '+') && isdigit(CurPtr[2]))) {
830 while (isdigit(CurPtr[0])) ++CurPtr;
834 APFloatVal = APFloat(atof(TokStart));
835 return lltok::APFloat;