1 // FormatString.cpp - Common stuff for handling printf/scanf formats -*- C++ -*-
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 // Shared details for processing format strings of printf and scanf
13 //===----------------------------------------------------------------------===//
15 #include "FormatStringParsing.h"
16 #include "clang/Basic/LangOptions.h"
17 #include "clang/Basic/TargetInfo.h"
18 #include "llvm/Support/ConvertUTF.h"
20 using clang::analyze_format_string::ArgType;
21 using clang::analyze_format_string::FormatStringHandler;
22 using clang::analyze_format_string::FormatSpecifier;
23 using clang::analyze_format_string::LengthModifier;
24 using clang::analyze_format_string::OptionalAmount;
25 using clang::analyze_format_string::PositionContext;
26 using clang::analyze_format_string::ConversionSpecifier;
27 using namespace clang;
29 // Key function to FormatStringHandler.
30 FormatStringHandler::~FormatStringHandler() {}
32 //===----------------------------------------------------------------------===//
33 // Functions for parsing format strings components in both printf and
34 // scanf format strings.
35 //===----------------------------------------------------------------------===//
38 clang::analyze_format_string::ParseAmount(const char *&Beg, const char *E) {
40 UpdateOnReturn <const char*> UpdateBeg(Beg, I);
42 unsigned accumulator = 0;
43 bool hasDigits = false;
45 for ( ; I != E; ++I) {
47 if (c >= '0' && c <= '9') {
49 accumulator = (accumulator * 10) + (c - '0');
54 return OptionalAmount(OptionalAmount::Constant, accumulator, Beg, I - Beg,
60 return OptionalAmount();
64 clang::analyze_format_string::ParseNonPositionAmount(const char *&Beg,
69 return OptionalAmount(OptionalAmount::Arg, argIndex++, Beg, 0, false);
72 return ParseAmount(Beg, E);
76 clang::analyze_format_string::ParsePositionAmount(FormatStringHandler &H,
82 const char *I = Beg + 1;
83 const OptionalAmount &Amt = ParseAmount(I, E);
85 if (Amt.getHowSpecified() == OptionalAmount::NotSpecified) {
86 H.HandleInvalidPosition(Beg, I - Beg, p);
87 return OptionalAmount(false);
91 // No more characters left?
92 H.HandleIncompleteSpecifier(Start, E - Start);
93 return OptionalAmount(false);
96 assert(Amt.getHowSpecified() == OptionalAmount::Constant);
99 // Handle positional arguments
101 // Special case: '*0$', since this is an easy mistake.
102 if (Amt.getConstantAmount() == 0) {
103 H.HandleZeroPosition(Beg, I - Beg + 1);
104 return OptionalAmount(false);
107 const char *Tmp = Beg;
110 return OptionalAmount(OptionalAmount::Arg, Amt.getConstantAmount() - 1,
114 H.HandleInvalidPosition(Beg, I - Beg, p);
115 return OptionalAmount(false);
118 return ParseAmount(Beg, E);
123 clang::analyze_format_string::ParseFieldWidth(FormatStringHandler &H,
126 const char *&Beg, const char *E,
127 unsigned *argIndex) {
128 // FIXME: Support negative field widths.
130 CS.setFieldWidth(ParseNonPositionAmount(Beg, E, *argIndex));
133 const OptionalAmount Amt =
134 ParsePositionAmount(H, Start, Beg, E,
135 analyze_format_string::FieldWidthPos);
139 CS.setFieldWidth(Amt);
145 clang::analyze_format_string::ParseArgPosition(FormatStringHandler &H,
152 const OptionalAmount &Amt = ParseAmount(I, E);
155 // No more characters left?
156 H.HandleIncompleteSpecifier(Start, E - Start);
160 if (Amt.getHowSpecified() == OptionalAmount::Constant && *(I++) == '$') {
161 // Warn that positional arguments are non-standard.
162 H.HandlePosition(Start, I - Start);
164 // Special case: '%0$', since this is an easy mistake.
165 if (Amt.getConstantAmount() == 0) {
166 H.HandleZeroPosition(Start, I - Start);
170 FS.setArgIndex(Amt.getConstantAmount() - 1);
171 FS.setUsesPositionalArg();
172 // Update the caller's pointer if we decided to consume
182 clang::analyze_format_string::ParseVectorModifier(FormatStringHandler &H,
186 const LangOptions &LO) {
190 const char *Start = I;
195 H.HandleIncompleteSpecifier(Start, E - Start);
199 OptionalAmount NumElts = ParseAmount(I, E);
200 if (NumElts.getHowSpecified() != OptionalAmount::Constant) {
201 H.HandleIncompleteSpecifier(Start, E - Start);
205 FS.setVectorNumElts(NumElts);
212 clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
215 const LangOptions &LO,
217 LengthModifier::Kind lmKind = LengthModifier::None;
218 const char *lmPosition = I;
224 if (I != E && *I == 'h') {
226 lmKind = LengthModifier::AsChar;
228 lmKind = LengthModifier::AsShort;
233 if (I != E && *I == 'l') {
235 lmKind = LengthModifier::AsLongLong;
237 lmKind = LengthModifier::AsLong;
240 case 'j': lmKind = LengthModifier::AsIntMax; ++I; break;
241 case 'z': lmKind = LengthModifier::AsSizeT; ++I; break;
242 case 't': lmKind = LengthModifier::AsPtrDiff; ++I; break;
243 case 'L': lmKind = LengthModifier::AsLongDouble; ++I; break;
244 case 'q': lmKind = LengthModifier::AsQuad; ++I; break;
246 if (IsScanf && !LO.C99 && !LO.CPlusPlus11) {
247 // For scanf in C90, look at the next character to see if this should
248 // be parsed as the GNU extension 'a' length modifier. If not, this
249 // will be parsed as a conversion specifier.
251 if (I != E && (*I == 's' || *I == 'S' || *I == '[')) {
252 lmKind = LengthModifier::AsAllocate;
260 lmKind = LengthModifier::AsMAllocate;
265 // printf: AsInt64, AsInt32, AsInt3264
268 if (I + 1 != E && I + 2 != E) {
269 if (I[1] == '6' && I[2] == '4') {
271 lmKind = LengthModifier::AsInt64;
277 if (I[1] == '3' && I[2] == '2') {
279 lmKind = LengthModifier::AsInt32;
284 lmKind = LengthModifier::AsInt3264;
287 lmKind = LengthModifier::AsWide; ++I; break;
289 LengthModifier lm(lmPosition, lmKind);
290 FS.setLengthModifier(lm);
294 bool clang::analyze_format_string::ParseUTF8InvalidSpecifier(
295 const char *SpecifierBegin, const char *FmtStrEnd, unsigned &Len) {
296 if (SpecifierBegin + 1 >= FmtStrEnd)
299 const llvm::UTF8 *SB =
300 reinterpret_cast<const llvm::UTF8 *>(SpecifierBegin + 1);
301 const llvm::UTF8 *SE = reinterpret_cast<const llvm::UTF8 *>(FmtStrEnd);
302 const char FirstByte = *SB;
304 // If the invalid specifier is a multibyte UTF-8 string, return the
305 // total length accordingly so that the conversion specifier can be
306 // properly updated to reflect a complete UTF-8 specifier.
307 unsigned NumBytes = llvm::getNumBytesForUTF8(FirstByte);
310 if (SB + NumBytes > SE)
317 //===----------------------------------------------------------------------===//
318 // Methods on ArgType.
319 //===----------------------------------------------------------------------===//
321 clang::analyze_format_string::ArgType::MatchKind
322 ArgType::matchesType(ASTContext &C, QualType argTy) const {
324 // It has to be a pointer.
325 const PointerType *PT = argTy->getAs<PointerType>();
329 // We cannot write through a const qualified pointer.
330 if (PT->getPointeeType().isConstQualified())
333 argTy = PT->getPointeeType();
338 llvm_unreachable("ArgType must be valid");
344 if (const EnumType *ETy = argTy->getAs<EnumType>()) {
345 // If the enum is incomplete we know nothing about the underlying type.
346 // Assume that it's 'int'.
347 if (!ETy->getDecl()->isComplete())
349 argTy = ETy->getDecl()->getIntegerType();
352 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
353 switch (BT->getKind()) {
356 case BuiltinType::Char_S:
357 case BuiltinType::SChar:
358 case BuiltinType::UChar:
359 case BuiltinType::Char_U:
366 if (const EnumType *ETy = argTy->getAs<EnumType>()) {
367 // If the enum is incomplete we know nothing about the underlying type.
368 // Assume that it's 'int'.
369 if (!ETy->getDecl()->isComplete())
372 argTy = ETy->getDecl()->getIntegerType();
374 argTy = C.getCanonicalType(argTy).getUnqualifiedType();
378 // Check for "compatible types".
379 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
380 switch (BT->getKind()) {
383 case BuiltinType::Char_S:
384 case BuiltinType::SChar:
385 case BuiltinType::Char_U:
386 case BuiltinType::UChar:
387 return T == C.UnsignedCharTy || T == C.SignedCharTy ? Match
389 case BuiltinType::Short:
390 return T == C.UnsignedShortTy ? Match : NoMatch;
391 case BuiltinType::UShort:
392 return T == C.ShortTy ? Match : NoMatch;
393 case BuiltinType::Int:
394 return T == C.UnsignedIntTy ? Match : NoMatch;
395 case BuiltinType::UInt:
396 return T == C.IntTy ? Match : NoMatch;
397 case BuiltinType::Long:
398 return T == C.UnsignedLongTy ? Match : NoMatch;
399 case BuiltinType::ULong:
400 return T == C.LongTy ? Match : NoMatch;
401 case BuiltinType::LongLong:
402 return T == C.UnsignedLongLongTy ? Match : NoMatch;
403 case BuiltinType::ULongLong:
404 return T == C.LongLongTy ? Match : NoMatch;
410 const PointerType *PT = argTy->getAs<PointerType>();
413 QualType pointeeTy = PT->getPointeeType();
414 if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
415 switch (BT->getKind()) {
416 case BuiltinType::Void:
417 case BuiltinType::Char_U:
418 case BuiltinType::UChar:
419 case BuiltinType::Char_S:
420 case BuiltinType::SChar:
430 const PointerType *PT = argTy->getAs<PointerType>();
434 C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
435 return pointeeTy == C.getWideCharType() ? Match : NoMatch;
439 QualType WInt = C.getCanonicalType(C.getWIntType()).getUnqualifiedType();
441 if (C.getCanonicalType(argTy).getUnqualifiedType() == WInt)
444 QualType PromoArg = argTy->isPromotableIntegerType()
445 ? C.getPromotedIntegerType(argTy)
447 PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
449 // If the promoted argument is the corresponding signed type of the
450 // wint_t type, then it should match.
451 if (PromoArg->hasSignedIntegerRepresentation() &&
452 C.getCorrespondingUnsignedType(PromoArg) == WInt)
455 return WInt == PromoArg ? Match : NoMatch;
459 if (argTy->isVoidPointerType()) {
461 } if (argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
462 argTy->isBlockPointerType() || argTy->isNullPtrType()) {
463 return NoMatchPedantic;
468 case ObjCPointerTy: {
469 if (argTy->getAs<ObjCObjectPointerType>() ||
470 argTy->getAs<BlockPointerType>())
473 // Handle implicit toll-free bridging.
474 if (const PointerType *PT = argTy->getAs<PointerType>()) {
475 // Things such as CFTypeRef are really just opaque pointers
476 // to C structs representing CF types that can often be bridged
477 // to Objective-C objects. Since the compiler doesn't know which
478 // structs can be toll-free bridged, we just accept them all.
479 QualType pointee = PT->getPointeeType();
480 if (pointee->getAsStructureType() || pointee->isVoidType())
487 llvm_unreachable("Invalid ArgType Kind!");
490 ArgType ArgType::makeVectorType(ASTContext &C, unsigned NumElts) const {
491 if (K != SpecificTy) // Won't be a valid vector element type.
492 return ArgType::Invalid();
494 QualType Vec = C.getExtVectorType(T, NumElts);
495 return ArgType(Vec, Name);
498 QualType ArgType::getRepresentativeType(ASTContext &C) const {
502 llvm_unreachable("No representative type for Invalid ArgType");
504 llvm_unreachable("No representative type for Unknown ArgType");
512 Res = C.getPointerType(C.CharTy);
515 Res = C.getPointerType(C.getWideCharType());
518 Res = C.ObjCBuiltinIdTy;
524 Res = C.getWIntType();
530 Res = C.getPointerType(Res);
534 std::string ArgType::getRepresentativeTypeName(ASTContext &C) const {
535 std::string S = getRepresentativeType(C).getAsString();
539 // Use a specific name for this type, e.g. "size_t".
542 // If ArgType is actually a pointer to T, append an asterisk.
543 Alias += (Alias[Alias.size()-1] == '*') ? "*" : " *";
545 // If Alias is the same as the underlying type, e.g. wchar_t, then drop it.
551 return std::string("'") + Alias + "' (aka '" + S + "')";
552 return std::string("'") + S + "'";
556 //===----------------------------------------------------------------------===//
557 // Methods on OptionalAmount.
558 //===----------------------------------------------------------------------===//
561 analyze_format_string::OptionalAmount::getArgType(ASTContext &Ctx) const {
565 //===----------------------------------------------------------------------===//
566 // Methods on LengthModifier.
567 //===----------------------------------------------------------------------===//
570 analyze_format_string::LengthModifier::toString() const {
576 case AsLong: // or AsWideChar
608 //===----------------------------------------------------------------------===//
609 // Methods on ConversionSpecifier.
610 //===----------------------------------------------------------------------===//
612 const char *ConversionSpecifier::toString() const {
614 case dArg: return "d";
615 case DArg: return "D";
616 case iArg: return "i";
617 case oArg: return "o";
618 case OArg: return "O";
619 case uArg: return "u";
620 case UArg: return "U";
621 case xArg: return "x";
622 case XArg: return "X";
623 case fArg: return "f";
624 case FArg: return "F";
625 case eArg: return "e";
626 case EArg: return "E";
627 case gArg: return "g";
628 case GArg: return "G";
629 case aArg: return "a";
630 case AArg: return "A";
631 case cArg: return "c";
632 case sArg: return "s";
633 case pArg: return "p";
636 case nArg: return "n";
637 case PercentArg: return "%";
638 case ScanListArg: return "[";
639 case InvalidSpecifier: return nullptr;
641 // POSIX unicode extensions.
642 case CArg: return "C";
643 case SArg: return "S";
645 // Objective-C specific specifiers.
646 case ObjCObjArg: return "@";
648 // FreeBSD kernel specific specifiers.
649 case FreeBSDbArg: return "b";
650 case FreeBSDDArg: return "D";
651 case FreeBSDrArg: return "r";
652 case FreeBSDyArg: return "y";
654 // GlibC specific specifiers.
655 case PrintErrno: return "m";
657 // MS specific specifiers.
658 case ZArg: return "Z";
663 Optional<ConversionSpecifier>
664 ConversionSpecifier::getStandardSpecifier() const {
665 ConversionSpecifier::Kind NewKind;
681 ConversionSpecifier FixedCS(*this);
682 FixedCS.setKind(NewKind);
686 //===----------------------------------------------------------------------===//
687 // Methods on OptionalAmount.
688 //===----------------------------------------------------------------------===//
690 void OptionalAmount::toString(raw_ostream &os) const {
698 if (usesPositionalArg())
699 os << "*" << getPositionalArgIndex() << "$";
711 bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target) const {
712 switch (LM.getKind()) {
713 case LengthModifier::None:
716 // Handle most integer flags
717 case LengthModifier::AsShort:
718 if (Target.getTriple().isOSMSVCRT()) {
719 switch (CS.getKind()) {
720 case ConversionSpecifier::cArg:
721 case ConversionSpecifier::CArg:
722 case ConversionSpecifier::sArg:
723 case ConversionSpecifier::SArg:
724 case ConversionSpecifier::ZArg:
731 case LengthModifier::AsChar:
732 case LengthModifier::AsLongLong:
733 case LengthModifier::AsQuad:
734 case LengthModifier::AsIntMax:
735 case LengthModifier::AsSizeT:
736 case LengthModifier::AsPtrDiff:
737 switch (CS.getKind()) {
738 case ConversionSpecifier::dArg:
739 case ConversionSpecifier::DArg:
740 case ConversionSpecifier::iArg:
741 case ConversionSpecifier::oArg:
742 case ConversionSpecifier::OArg:
743 case ConversionSpecifier::uArg:
744 case ConversionSpecifier::UArg:
745 case ConversionSpecifier::xArg:
746 case ConversionSpecifier::XArg:
747 case ConversionSpecifier::nArg:
749 case ConversionSpecifier::FreeBSDrArg:
750 case ConversionSpecifier::FreeBSDyArg:
751 return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
757 case LengthModifier::AsLong: // or AsWideChar
758 switch (CS.getKind()) {
759 case ConversionSpecifier::dArg:
760 case ConversionSpecifier::DArg:
761 case ConversionSpecifier::iArg:
762 case ConversionSpecifier::oArg:
763 case ConversionSpecifier::OArg:
764 case ConversionSpecifier::uArg:
765 case ConversionSpecifier::UArg:
766 case ConversionSpecifier::xArg:
767 case ConversionSpecifier::XArg:
768 case ConversionSpecifier::aArg:
769 case ConversionSpecifier::AArg:
770 case ConversionSpecifier::fArg:
771 case ConversionSpecifier::FArg:
772 case ConversionSpecifier::eArg:
773 case ConversionSpecifier::EArg:
774 case ConversionSpecifier::gArg:
775 case ConversionSpecifier::GArg:
776 case ConversionSpecifier::nArg:
777 case ConversionSpecifier::cArg:
778 case ConversionSpecifier::sArg:
779 case ConversionSpecifier::ScanListArg:
780 case ConversionSpecifier::ZArg:
782 case ConversionSpecifier::FreeBSDrArg:
783 case ConversionSpecifier::FreeBSDyArg:
784 return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
789 case LengthModifier::AsLongDouble:
790 switch (CS.getKind()) {
791 case ConversionSpecifier::aArg:
792 case ConversionSpecifier::AArg:
793 case ConversionSpecifier::fArg:
794 case ConversionSpecifier::FArg:
795 case ConversionSpecifier::eArg:
796 case ConversionSpecifier::EArg:
797 case ConversionSpecifier::gArg:
798 case ConversionSpecifier::GArg:
800 // GNU libc extension.
801 case ConversionSpecifier::dArg:
802 case ConversionSpecifier::iArg:
803 case ConversionSpecifier::oArg:
804 case ConversionSpecifier::uArg:
805 case ConversionSpecifier::xArg:
806 case ConversionSpecifier::XArg:
807 return !Target.getTriple().isOSDarwin() &&
808 !Target.getTriple().isOSWindows();
813 case LengthModifier::AsAllocate:
814 switch (CS.getKind()) {
815 case ConversionSpecifier::sArg:
816 case ConversionSpecifier::SArg:
817 case ConversionSpecifier::ScanListArg:
823 case LengthModifier::AsMAllocate:
824 switch (CS.getKind()) {
825 case ConversionSpecifier::cArg:
826 case ConversionSpecifier::CArg:
827 case ConversionSpecifier::sArg:
828 case ConversionSpecifier::SArg:
829 case ConversionSpecifier::ScanListArg:
834 case LengthModifier::AsInt32:
835 case LengthModifier::AsInt3264:
836 case LengthModifier::AsInt64:
837 switch (CS.getKind()) {
838 case ConversionSpecifier::dArg:
839 case ConversionSpecifier::iArg:
840 case ConversionSpecifier::oArg:
841 case ConversionSpecifier::uArg:
842 case ConversionSpecifier::xArg:
843 case ConversionSpecifier::XArg:
844 return Target.getTriple().isOSMSVCRT();
848 case LengthModifier::AsWide:
849 switch (CS.getKind()) {
850 case ConversionSpecifier::cArg:
851 case ConversionSpecifier::CArg:
852 case ConversionSpecifier::sArg:
853 case ConversionSpecifier::SArg:
854 case ConversionSpecifier::ZArg:
855 return Target.getTriple().isOSMSVCRT();
860 llvm_unreachable("Invalid LengthModifier Kind!");
863 bool FormatSpecifier::hasStandardLengthModifier() const {
864 switch (LM.getKind()) {
865 case LengthModifier::None:
866 case LengthModifier::AsChar:
867 case LengthModifier::AsShort:
868 case LengthModifier::AsLong:
869 case LengthModifier::AsLongLong:
870 case LengthModifier::AsIntMax:
871 case LengthModifier::AsSizeT:
872 case LengthModifier::AsPtrDiff:
873 case LengthModifier::AsLongDouble:
875 case LengthModifier::AsAllocate:
876 case LengthModifier::AsMAllocate:
877 case LengthModifier::AsQuad:
878 case LengthModifier::AsInt32:
879 case LengthModifier::AsInt3264:
880 case LengthModifier::AsInt64:
881 case LengthModifier::AsWide:
884 llvm_unreachable("Invalid LengthModifier Kind!");
887 bool FormatSpecifier::hasStandardConversionSpecifier(
888 const LangOptions &LangOpt) const {
889 switch (CS.getKind()) {
890 case ConversionSpecifier::cArg:
891 case ConversionSpecifier::dArg:
892 case ConversionSpecifier::iArg:
893 case ConversionSpecifier::oArg:
894 case ConversionSpecifier::uArg:
895 case ConversionSpecifier::xArg:
896 case ConversionSpecifier::XArg:
897 case ConversionSpecifier::fArg:
898 case ConversionSpecifier::FArg:
899 case ConversionSpecifier::eArg:
900 case ConversionSpecifier::EArg:
901 case ConversionSpecifier::gArg:
902 case ConversionSpecifier::GArg:
903 case ConversionSpecifier::aArg:
904 case ConversionSpecifier::AArg:
905 case ConversionSpecifier::sArg:
906 case ConversionSpecifier::pArg:
907 case ConversionSpecifier::nArg:
908 case ConversionSpecifier::ObjCObjArg:
909 case ConversionSpecifier::ScanListArg:
910 case ConversionSpecifier::PercentArg:
911 case ConversionSpecifier::PArg:
913 case ConversionSpecifier::CArg:
914 case ConversionSpecifier::SArg:
916 case ConversionSpecifier::InvalidSpecifier:
917 case ConversionSpecifier::FreeBSDbArg:
918 case ConversionSpecifier::FreeBSDDArg:
919 case ConversionSpecifier::FreeBSDrArg:
920 case ConversionSpecifier::FreeBSDyArg:
921 case ConversionSpecifier::PrintErrno:
922 case ConversionSpecifier::DArg:
923 case ConversionSpecifier::OArg:
924 case ConversionSpecifier::UArg:
925 case ConversionSpecifier::ZArg:
928 llvm_unreachable("Invalid ConversionSpecifier Kind!");
931 bool FormatSpecifier::hasStandardLengthConversionCombination() const {
932 if (LM.getKind() == LengthModifier::AsLongDouble) {
933 switch(CS.getKind()) {
934 case ConversionSpecifier::dArg:
935 case ConversionSpecifier::iArg:
936 case ConversionSpecifier::oArg:
937 case ConversionSpecifier::uArg:
938 case ConversionSpecifier::xArg:
939 case ConversionSpecifier::XArg:
948 Optional<LengthModifier> FormatSpecifier::getCorrectedLengthModifier() const {
949 if (CS.isAnyIntArg() || CS.getKind() == ConversionSpecifier::nArg) {
950 if (LM.getKind() == LengthModifier::AsLongDouble ||
951 LM.getKind() == LengthModifier::AsQuad) {
952 LengthModifier FixedLM(LM);
953 FixedLM.setKind(LengthModifier::AsLongLong);
961 bool FormatSpecifier::namedTypeToLengthModifier(QualType QT,
962 LengthModifier &LM) {
963 assert(isa<TypedefType>(QT) && "Expected a TypedefType");
964 const TypedefNameDecl *Typedef = cast<TypedefType>(QT)->getDecl();
967 const IdentifierInfo *Identifier = Typedef->getIdentifier();
968 if (Identifier->getName() == "size_t") {
969 LM.setKind(LengthModifier::AsSizeT);
971 } else if (Identifier->getName() == "ssize_t") {
972 // Not C99, but common in Unix.
973 LM.setKind(LengthModifier::AsSizeT);
975 } else if (Identifier->getName() == "intmax_t") {
976 LM.setKind(LengthModifier::AsIntMax);
978 } else if (Identifier->getName() == "uintmax_t") {
979 LM.setKind(LengthModifier::AsIntMax);
981 } else if (Identifier->getName() == "ptrdiff_t") {
982 LM.setKind(LengthModifier::AsPtrDiff);
986 QualType T = Typedef->getUnderlyingType();
987 if (!isa<TypedefType>(T))
990 Typedef = cast<TypedefType>(T)->getDecl();