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::ParseLengthModifier(FormatSpecifier &FS,
185 const LangOptions &LO,
187 LengthModifier::Kind lmKind = LengthModifier::None;
188 const char *lmPosition = I;
194 if (I != E && *I == 'h') {
196 lmKind = LengthModifier::AsChar;
198 lmKind = LengthModifier::AsShort;
203 if (I != E && *I == 'l') {
205 lmKind = LengthModifier::AsLongLong;
207 lmKind = LengthModifier::AsLong;
210 case 'j': lmKind = LengthModifier::AsIntMax; ++I; break;
211 case 'z': lmKind = LengthModifier::AsSizeT; ++I; break;
212 case 't': lmKind = LengthModifier::AsPtrDiff; ++I; break;
213 case 'L': lmKind = LengthModifier::AsLongDouble; ++I; break;
214 case 'q': lmKind = LengthModifier::AsQuad; ++I; break;
216 if (IsScanf && !LO.C99 && !LO.CPlusPlus11) {
217 // For scanf in C90, look at the next character to see if this should
218 // be parsed as the GNU extension 'a' length modifier. If not, this
219 // will be parsed as a conversion specifier.
221 if (I != E && (*I == 's' || *I == 'S' || *I == '[')) {
222 lmKind = LengthModifier::AsAllocate;
230 lmKind = LengthModifier::AsMAllocate;
235 // printf: AsInt64, AsInt32, AsInt3264
238 if (I + 1 != E && I + 2 != E) {
239 if (I[1] == '6' && I[2] == '4') {
241 lmKind = LengthModifier::AsInt64;
247 if (I[1] == '3' && I[2] == '2') {
249 lmKind = LengthModifier::AsInt32;
254 lmKind = LengthModifier::AsInt3264;
257 lmKind = LengthModifier::AsWide; ++I; break;
259 LengthModifier lm(lmPosition, lmKind);
260 FS.setLengthModifier(lm);
264 bool clang::analyze_format_string::ParseUTF8InvalidSpecifier(
265 const char *SpecifierBegin, const char *FmtStrEnd, unsigned &Len) {
266 if (SpecifierBegin + 1 >= FmtStrEnd)
269 const llvm::UTF8 *SB =
270 reinterpret_cast<const llvm::UTF8 *>(SpecifierBegin + 1);
271 const llvm::UTF8 *SE = reinterpret_cast<const llvm::UTF8 *>(FmtStrEnd);
272 const char FirstByte = *SB;
274 // If the invalid specifier is a multibyte UTF-8 string, return the
275 // total length accordingly so that the conversion specifier can be
276 // properly updated to reflect a complete UTF-8 specifier.
277 unsigned NumBytes = llvm::getNumBytesForUTF8(FirstByte);
280 if (SB + NumBytes > SE)
287 //===----------------------------------------------------------------------===//
288 // Methods on ArgType.
289 //===----------------------------------------------------------------------===//
291 clang::analyze_format_string::ArgType::MatchKind
292 ArgType::matchesType(ASTContext &C, QualType argTy) const {
294 // It has to be a pointer.
295 const PointerType *PT = argTy->getAs<PointerType>();
299 // We cannot write through a const qualified pointer.
300 if (PT->getPointeeType().isConstQualified())
303 argTy = PT->getPointeeType();
308 llvm_unreachable("ArgType must be valid");
314 if (const EnumType *ETy = argTy->getAs<EnumType>()) {
315 // If the enum is incomplete we know nothing about the underlying type.
316 // Assume that it's 'int'.
317 if (!ETy->getDecl()->isComplete())
319 argTy = ETy->getDecl()->getIntegerType();
322 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
323 switch (BT->getKind()) {
326 case BuiltinType::Char_S:
327 case BuiltinType::SChar:
328 case BuiltinType::UChar:
329 case BuiltinType::Char_U:
336 if (const EnumType *ETy = argTy->getAs<EnumType>()) {
337 // If the enum is incomplete we know nothing about the underlying type.
338 // Assume that it's 'int'.
339 if (!ETy->getDecl()->isComplete())
342 argTy = ETy->getDecl()->getIntegerType();
344 argTy = C.getCanonicalType(argTy).getUnqualifiedType();
348 // Check for "compatible types".
349 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
350 switch (BT->getKind()) {
353 case BuiltinType::Char_S:
354 case BuiltinType::SChar:
355 case BuiltinType::Char_U:
356 case BuiltinType::UChar:
357 return T == C.UnsignedCharTy || T == C.SignedCharTy ? Match
359 case BuiltinType::Short:
360 return T == C.UnsignedShortTy ? Match : NoMatch;
361 case BuiltinType::UShort:
362 return T == C.ShortTy ? Match : NoMatch;
363 case BuiltinType::Int:
364 return T == C.UnsignedIntTy ? Match : NoMatch;
365 case BuiltinType::UInt:
366 return T == C.IntTy ? Match : NoMatch;
367 case BuiltinType::Long:
368 return T == C.UnsignedLongTy ? Match : NoMatch;
369 case BuiltinType::ULong:
370 return T == C.LongTy ? Match : NoMatch;
371 case BuiltinType::LongLong:
372 return T == C.UnsignedLongLongTy ? Match : NoMatch;
373 case BuiltinType::ULongLong:
374 return T == C.LongLongTy ? Match : NoMatch;
380 const PointerType *PT = argTy->getAs<PointerType>();
383 QualType pointeeTy = PT->getPointeeType();
384 if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
385 switch (BT->getKind()) {
386 case BuiltinType::Void:
387 case BuiltinType::Char_U:
388 case BuiltinType::UChar:
389 case BuiltinType::Char_S:
390 case BuiltinType::SChar:
400 const PointerType *PT = argTy->getAs<PointerType>();
404 C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
405 return pointeeTy == C.getWideCharType() ? Match : NoMatch;
411 argTy->isPromotableIntegerType()
412 ? C.getPromotedIntegerType(argTy) : argTy;
414 QualType WInt = C.getCanonicalType(C.getWIntType()).getUnqualifiedType();
415 PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
417 // If the promoted argument is the corresponding signed type of the
418 // wint_t type, then it should match.
419 if (PromoArg->hasSignedIntegerRepresentation() &&
420 C.getCorrespondingUnsignedType(PromoArg) == WInt)
423 return WInt == PromoArg ? Match : NoMatch;
427 if (argTy->isVoidPointerType()) {
429 } if (argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
430 argTy->isBlockPointerType() || argTy->isNullPtrType()) {
431 return NoMatchPedantic;
436 case ObjCPointerTy: {
437 if (argTy->getAs<ObjCObjectPointerType>() ||
438 argTy->getAs<BlockPointerType>())
441 // Handle implicit toll-free bridging.
442 if (const PointerType *PT = argTy->getAs<PointerType>()) {
443 // Things such as CFTypeRef are really just opaque pointers
444 // to C structs representing CF types that can often be bridged
445 // to Objective-C objects. Since the compiler doesn't know which
446 // structs can be toll-free bridged, we just accept them all.
447 QualType pointee = PT->getPointeeType();
448 if (pointee->getAsStructureType() || pointee->isVoidType())
455 llvm_unreachable("Invalid ArgType Kind!");
458 QualType ArgType::getRepresentativeType(ASTContext &C) const {
462 llvm_unreachable("No representative type for Invalid ArgType");
464 llvm_unreachable("No representative type for Unknown ArgType");
472 Res = C.getPointerType(C.CharTy);
475 Res = C.getPointerType(C.getWideCharType());
478 Res = C.ObjCBuiltinIdTy;
484 Res = C.getWIntType();
490 Res = C.getPointerType(Res);
494 std::string ArgType::getRepresentativeTypeName(ASTContext &C) const {
495 std::string S = getRepresentativeType(C).getAsString();
499 // Use a specific name for this type, e.g. "size_t".
502 // If ArgType is actually a pointer to T, append an asterisk.
503 Alias += (Alias[Alias.size()-1] == '*') ? "*" : " *";
505 // If Alias is the same as the underlying type, e.g. wchar_t, then drop it.
511 return std::string("'") + Alias + "' (aka '" + S + "')";
512 return std::string("'") + S + "'";
516 //===----------------------------------------------------------------------===//
517 // Methods on OptionalAmount.
518 //===----------------------------------------------------------------------===//
521 analyze_format_string::OptionalAmount::getArgType(ASTContext &Ctx) const {
525 //===----------------------------------------------------------------------===//
526 // Methods on LengthModifier.
527 //===----------------------------------------------------------------------===//
530 analyze_format_string::LengthModifier::toString() const {
536 case AsLong: // or AsWideChar
568 //===----------------------------------------------------------------------===//
569 // Methods on ConversionSpecifier.
570 //===----------------------------------------------------------------------===//
572 const char *ConversionSpecifier::toString() const {
574 case dArg: return "d";
575 case DArg: return "D";
576 case iArg: return "i";
577 case oArg: return "o";
578 case OArg: return "O";
579 case uArg: return "u";
580 case UArg: return "U";
581 case xArg: return "x";
582 case XArg: return "X";
583 case fArg: return "f";
584 case FArg: return "F";
585 case eArg: return "e";
586 case EArg: return "E";
587 case gArg: return "g";
588 case GArg: return "G";
589 case aArg: return "a";
590 case AArg: return "A";
591 case cArg: return "c";
592 case sArg: return "s";
593 case pArg: return "p";
596 case nArg: return "n";
597 case PercentArg: return "%";
598 case ScanListArg: return "[";
599 case InvalidSpecifier: return nullptr;
601 // POSIX unicode extensions.
602 case CArg: return "C";
603 case SArg: return "S";
605 // Objective-C specific specifiers.
606 case ObjCObjArg: return "@";
608 // FreeBSD kernel specific specifiers.
609 case FreeBSDbArg: return "b";
610 case FreeBSDDArg: return "D";
611 case FreeBSDrArg: return "r";
612 case FreeBSDyArg: return "y";
614 // GlibC specific specifiers.
615 case PrintErrno: return "m";
617 // MS specific specifiers.
618 case ZArg: return "Z";
623 Optional<ConversionSpecifier>
624 ConversionSpecifier::getStandardSpecifier() const {
625 ConversionSpecifier::Kind NewKind;
641 ConversionSpecifier FixedCS(*this);
642 FixedCS.setKind(NewKind);
646 //===----------------------------------------------------------------------===//
647 // Methods on OptionalAmount.
648 //===----------------------------------------------------------------------===//
650 void OptionalAmount::toString(raw_ostream &os) const {
658 if (usesPositionalArg())
659 os << "*" << getPositionalArgIndex() << "$";
671 bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target) const {
672 switch (LM.getKind()) {
673 case LengthModifier::None:
676 // Handle most integer flags
677 case LengthModifier::AsShort:
678 if (Target.getTriple().isOSMSVCRT()) {
679 switch (CS.getKind()) {
680 case ConversionSpecifier::cArg:
681 case ConversionSpecifier::CArg:
682 case ConversionSpecifier::sArg:
683 case ConversionSpecifier::SArg:
684 case ConversionSpecifier::ZArg:
691 case LengthModifier::AsChar:
692 case LengthModifier::AsLongLong:
693 case LengthModifier::AsQuad:
694 case LengthModifier::AsIntMax:
695 case LengthModifier::AsSizeT:
696 case LengthModifier::AsPtrDiff:
697 switch (CS.getKind()) {
698 case ConversionSpecifier::dArg:
699 case ConversionSpecifier::DArg:
700 case ConversionSpecifier::iArg:
701 case ConversionSpecifier::oArg:
702 case ConversionSpecifier::OArg:
703 case ConversionSpecifier::uArg:
704 case ConversionSpecifier::UArg:
705 case ConversionSpecifier::xArg:
706 case ConversionSpecifier::XArg:
707 case ConversionSpecifier::nArg:
709 case ConversionSpecifier::FreeBSDrArg:
710 case ConversionSpecifier::FreeBSDyArg:
711 return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
717 case LengthModifier::AsLong: // or AsWideChar
718 switch (CS.getKind()) {
719 case ConversionSpecifier::dArg:
720 case ConversionSpecifier::DArg:
721 case ConversionSpecifier::iArg:
722 case ConversionSpecifier::oArg:
723 case ConversionSpecifier::OArg:
724 case ConversionSpecifier::uArg:
725 case ConversionSpecifier::UArg:
726 case ConversionSpecifier::xArg:
727 case ConversionSpecifier::XArg:
728 case ConversionSpecifier::aArg:
729 case ConversionSpecifier::AArg:
730 case ConversionSpecifier::fArg:
731 case ConversionSpecifier::FArg:
732 case ConversionSpecifier::eArg:
733 case ConversionSpecifier::EArg:
734 case ConversionSpecifier::gArg:
735 case ConversionSpecifier::GArg:
736 case ConversionSpecifier::nArg:
737 case ConversionSpecifier::cArg:
738 case ConversionSpecifier::sArg:
739 case ConversionSpecifier::ScanListArg:
740 case ConversionSpecifier::ZArg:
742 case ConversionSpecifier::FreeBSDrArg:
743 case ConversionSpecifier::FreeBSDyArg:
744 return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
749 case LengthModifier::AsLongDouble:
750 switch (CS.getKind()) {
751 case ConversionSpecifier::aArg:
752 case ConversionSpecifier::AArg:
753 case ConversionSpecifier::fArg:
754 case ConversionSpecifier::FArg:
755 case ConversionSpecifier::eArg:
756 case ConversionSpecifier::EArg:
757 case ConversionSpecifier::gArg:
758 case ConversionSpecifier::GArg:
760 // GNU libc extension.
761 case ConversionSpecifier::dArg:
762 case ConversionSpecifier::iArg:
763 case ConversionSpecifier::oArg:
764 case ConversionSpecifier::uArg:
765 case ConversionSpecifier::xArg:
766 case ConversionSpecifier::XArg:
767 return !Target.getTriple().isOSDarwin() &&
768 !Target.getTriple().isOSWindows();
773 case LengthModifier::AsAllocate:
774 switch (CS.getKind()) {
775 case ConversionSpecifier::sArg:
776 case ConversionSpecifier::SArg:
777 case ConversionSpecifier::ScanListArg:
783 case LengthModifier::AsMAllocate:
784 switch (CS.getKind()) {
785 case ConversionSpecifier::cArg:
786 case ConversionSpecifier::CArg:
787 case ConversionSpecifier::sArg:
788 case ConversionSpecifier::SArg:
789 case ConversionSpecifier::ScanListArg:
794 case LengthModifier::AsInt32:
795 case LengthModifier::AsInt3264:
796 case LengthModifier::AsInt64:
797 switch (CS.getKind()) {
798 case ConversionSpecifier::dArg:
799 case ConversionSpecifier::iArg:
800 case ConversionSpecifier::oArg:
801 case ConversionSpecifier::uArg:
802 case ConversionSpecifier::xArg:
803 case ConversionSpecifier::XArg:
804 return Target.getTriple().isOSMSVCRT();
808 case LengthModifier::AsWide:
809 switch (CS.getKind()) {
810 case ConversionSpecifier::cArg:
811 case ConversionSpecifier::CArg:
812 case ConversionSpecifier::sArg:
813 case ConversionSpecifier::SArg:
814 case ConversionSpecifier::ZArg:
815 return Target.getTriple().isOSMSVCRT();
820 llvm_unreachable("Invalid LengthModifier Kind!");
823 bool FormatSpecifier::hasStandardLengthModifier() const {
824 switch (LM.getKind()) {
825 case LengthModifier::None:
826 case LengthModifier::AsChar:
827 case LengthModifier::AsShort:
828 case LengthModifier::AsLong:
829 case LengthModifier::AsLongLong:
830 case LengthModifier::AsIntMax:
831 case LengthModifier::AsSizeT:
832 case LengthModifier::AsPtrDiff:
833 case LengthModifier::AsLongDouble:
835 case LengthModifier::AsAllocate:
836 case LengthModifier::AsMAllocate:
837 case LengthModifier::AsQuad:
838 case LengthModifier::AsInt32:
839 case LengthModifier::AsInt3264:
840 case LengthModifier::AsInt64:
841 case LengthModifier::AsWide:
844 llvm_unreachable("Invalid LengthModifier Kind!");
847 bool FormatSpecifier::hasStandardConversionSpecifier(
848 const LangOptions &LangOpt) const {
849 switch (CS.getKind()) {
850 case ConversionSpecifier::cArg:
851 case ConversionSpecifier::dArg:
852 case ConversionSpecifier::iArg:
853 case ConversionSpecifier::oArg:
854 case ConversionSpecifier::uArg:
855 case ConversionSpecifier::xArg:
856 case ConversionSpecifier::XArg:
857 case ConversionSpecifier::fArg:
858 case ConversionSpecifier::FArg:
859 case ConversionSpecifier::eArg:
860 case ConversionSpecifier::EArg:
861 case ConversionSpecifier::gArg:
862 case ConversionSpecifier::GArg:
863 case ConversionSpecifier::aArg:
864 case ConversionSpecifier::AArg:
865 case ConversionSpecifier::sArg:
866 case ConversionSpecifier::pArg:
867 case ConversionSpecifier::nArg:
868 case ConversionSpecifier::ObjCObjArg:
869 case ConversionSpecifier::ScanListArg:
870 case ConversionSpecifier::PercentArg:
871 case ConversionSpecifier::PArg:
873 case ConversionSpecifier::CArg:
874 case ConversionSpecifier::SArg:
875 return LangOpt.ObjC1 || LangOpt.ObjC2;
876 case ConversionSpecifier::InvalidSpecifier:
877 case ConversionSpecifier::FreeBSDbArg:
878 case ConversionSpecifier::FreeBSDDArg:
879 case ConversionSpecifier::FreeBSDrArg:
880 case ConversionSpecifier::FreeBSDyArg:
881 case ConversionSpecifier::PrintErrno:
882 case ConversionSpecifier::DArg:
883 case ConversionSpecifier::OArg:
884 case ConversionSpecifier::UArg:
885 case ConversionSpecifier::ZArg:
888 llvm_unreachable("Invalid ConversionSpecifier Kind!");
891 bool FormatSpecifier::hasStandardLengthConversionCombination() const {
892 if (LM.getKind() == LengthModifier::AsLongDouble) {
893 switch(CS.getKind()) {
894 case ConversionSpecifier::dArg:
895 case ConversionSpecifier::iArg:
896 case ConversionSpecifier::oArg:
897 case ConversionSpecifier::uArg:
898 case ConversionSpecifier::xArg:
899 case ConversionSpecifier::XArg:
908 Optional<LengthModifier> FormatSpecifier::getCorrectedLengthModifier() const {
909 if (CS.isAnyIntArg() || CS.getKind() == ConversionSpecifier::nArg) {
910 if (LM.getKind() == LengthModifier::AsLongDouble ||
911 LM.getKind() == LengthModifier::AsQuad) {
912 LengthModifier FixedLM(LM);
913 FixedLM.setKind(LengthModifier::AsLongLong);
921 bool FormatSpecifier::namedTypeToLengthModifier(QualType QT,
922 LengthModifier &LM) {
923 assert(isa<TypedefType>(QT) && "Expected a TypedefType");
924 const TypedefNameDecl *Typedef = cast<TypedefType>(QT)->getDecl();
927 const IdentifierInfo *Identifier = Typedef->getIdentifier();
928 if (Identifier->getName() == "size_t") {
929 LM.setKind(LengthModifier::AsSizeT);
931 } else if (Identifier->getName() == "ssize_t") {
932 // Not C99, but common in Unix.
933 LM.setKind(LengthModifier::AsSizeT);
935 } else if (Identifier->getName() == "intmax_t") {
936 LM.setKind(LengthModifier::AsIntMax);
938 } else if (Identifier->getName() == "uintmax_t") {
939 LM.setKind(LengthModifier::AsIntMax);
941 } else if (Identifier->getName() == "ptrdiff_t") {
942 LM.setKind(LengthModifier::AsPtrDiff);
946 QualType T = Typedef->getUnderlyingType();
947 if (!isa<TypedefType>(T))
950 Typedef = cast<TypedefType>(T)->getDecl();