1 // FormatString.cpp - Common stuff for handling printf/scanf formats -*- C++ -*-
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 // Shared details for processing format strings of printf and scanf
11 // (and friends).
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "FormatStringParsing.h"
16 #include "clang/Basic/LangOptions.h"
17 #include "clang/Basic/TargetInfo.h"
18 #include "llvm/Support/ConvertUTF.h"
19
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;
28
29 // Key function to FormatStringHandler.
~FormatStringHandler()30 FormatStringHandler::~FormatStringHandler() {}
31
32 //===----------------------------------------------------------------------===//
33 // Functions for parsing format strings components in both printf and
34 // scanf format strings.
35 //===----------------------------------------------------------------------===//
36
37 OptionalAmount
ParseAmount(const char * & Beg,const char * E)38 clang::analyze_format_string::ParseAmount(const char *&Beg, const char *E) {
39 const char *I = Beg;
40 UpdateOnReturn <const char*> UpdateBeg(Beg, I);
41
42 unsigned accumulator = 0;
43 bool hasDigits = false;
44
45 for ( ; I != E; ++I) {
46 char c = *I;
47 if (c >= '0' && c <= '9') {
48 hasDigits = true;
49 accumulator = (accumulator * 10) + (c - '0');
50 continue;
51 }
52
53 if (hasDigits)
54 return OptionalAmount(OptionalAmount::Constant, accumulator, Beg, I - Beg,
55 false);
56
57 break;
58 }
59
60 return OptionalAmount();
61 }
62
63 OptionalAmount
ParseNonPositionAmount(const char * & Beg,const char * E,unsigned & argIndex)64 clang::analyze_format_string::ParseNonPositionAmount(const char *&Beg,
65 const char *E,
66 unsigned &argIndex) {
67 if (*Beg == '*') {
68 ++Beg;
69 return OptionalAmount(OptionalAmount::Arg, argIndex++, Beg, 0, false);
70 }
71
72 return ParseAmount(Beg, E);
73 }
74
75 OptionalAmount
ParsePositionAmount(FormatStringHandler & H,const char * Start,const char * & Beg,const char * E,PositionContext p)76 clang::analyze_format_string::ParsePositionAmount(FormatStringHandler &H,
77 const char *Start,
78 const char *&Beg,
79 const char *E,
80 PositionContext p) {
81 if (*Beg == '*') {
82 const char *I = Beg + 1;
83 const OptionalAmount &Amt = ParseAmount(I, E);
84
85 if (Amt.getHowSpecified() == OptionalAmount::NotSpecified) {
86 H.HandleInvalidPosition(Beg, I - Beg, p);
87 return OptionalAmount(false);
88 }
89
90 if (I == E) {
91 // No more characters left?
92 H.HandleIncompleteSpecifier(Start, E - Start);
93 return OptionalAmount(false);
94 }
95
96 assert(Amt.getHowSpecified() == OptionalAmount::Constant);
97
98 if (*I == '$') {
99 // Handle positional arguments
100
101 // Special case: '*0$', since this is an easy mistake.
102 if (Amt.getConstantAmount() == 0) {
103 H.HandleZeroPosition(Beg, I - Beg + 1);
104 return OptionalAmount(false);
105 }
106
107 const char *Tmp = Beg;
108 Beg = ++I;
109
110 return OptionalAmount(OptionalAmount::Arg, Amt.getConstantAmount() - 1,
111 Tmp, 0, true);
112 }
113
114 H.HandleInvalidPosition(Beg, I - Beg, p);
115 return OptionalAmount(false);
116 }
117
118 return ParseAmount(Beg, E);
119 }
120
121
122 bool
ParseFieldWidth(FormatStringHandler & H,FormatSpecifier & CS,const char * Start,const char * & Beg,const char * E,unsigned * argIndex)123 clang::analyze_format_string::ParseFieldWidth(FormatStringHandler &H,
124 FormatSpecifier &CS,
125 const char *Start,
126 const char *&Beg, const char *E,
127 unsigned *argIndex) {
128 // FIXME: Support negative field widths.
129 if (argIndex) {
130 CS.setFieldWidth(ParseNonPositionAmount(Beg, E, *argIndex));
131 }
132 else {
133 const OptionalAmount Amt =
134 ParsePositionAmount(H, Start, Beg, E,
135 analyze_format_string::FieldWidthPos);
136
137 if (Amt.isInvalid())
138 return true;
139 CS.setFieldWidth(Amt);
140 }
141 return false;
142 }
143
144 bool
ParseArgPosition(FormatStringHandler & H,FormatSpecifier & FS,const char * Start,const char * & Beg,const char * E)145 clang::analyze_format_string::ParseArgPosition(FormatStringHandler &H,
146 FormatSpecifier &FS,
147 const char *Start,
148 const char *&Beg,
149 const char *E) {
150 const char *I = Beg;
151
152 const OptionalAmount &Amt = ParseAmount(I, E);
153
154 if (I == E) {
155 // No more characters left?
156 H.HandleIncompleteSpecifier(Start, E - Start);
157 return true;
158 }
159
160 if (Amt.getHowSpecified() == OptionalAmount::Constant && *(I++) == '$') {
161 // Warn that positional arguments are non-standard.
162 H.HandlePosition(Start, I - Start);
163
164 // Special case: '%0$', since this is an easy mistake.
165 if (Amt.getConstantAmount() == 0) {
166 H.HandleZeroPosition(Start, I - Start);
167 return true;
168 }
169
170 FS.setArgIndex(Amt.getConstantAmount() - 1);
171 FS.setUsesPositionalArg();
172 // Update the caller's pointer if we decided to consume
173 // these characters.
174 Beg = I;
175 return false;
176 }
177
178 return false;
179 }
180
181 bool
ParseLengthModifier(FormatSpecifier & FS,const char * & I,const char * E,const LangOptions & LO,bool IsScanf)182 clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
183 const char *&I,
184 const char *E,
185 const LangOptions &LO,
186 bool IsScanf) {
187 LengthModifier::Kind lmKind = LengthModifier::None;
188 const char *lmPosition = I;
189 switch (*I) {
190 default:
191 return false;
192 case 'h':
193 ++I;
194 if (I != E && *I == 'h') {
195 ++I;
196 lmKind = LengthModifier::AsChar;
197 } else {
198 lmKind = LengthModifier::AsShort;
199 }
200 break;
201 case 'l':
202 ++I;
203 if (I != E && *I == 'l') {
204 ++I;
205 lmKind = LengthModifier::AsLongLong;
206 } else {
207 lmKind = LengthModifier::AsLong;
208 }
209 break;
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;
215 case 'a':
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.
220 ++I;
221 if (I != E && (*I == 's' || *I == 'S' || *I == '[')) {
222 lmKind = LengthModifier::AsAllocate;
223 break;
224 }
225 --I;
226 }
227 return false;
228 case 'm':
229 if (IsScanf) {
230 lmKind = LengthModifier::AsMAllocate;
231 ++I;
232 break;
233 }
234 return false;
235 // printf: AsInt64, AsInt32, AsInt3264
236 // scanf: AsInt64
237 case 'I':
238 if (I + 1 != E && I + 2 != E) {
239 if (I[1] == '6' && I[2] == '4') {
240 I += 3;
241 lmKind = LengthModifier::AsInt64;
242 break;
243 }
244 if (IsScanf)
245 return false;
246
247 if (I[1] == '3' && I[2] == '2') {
248 I += 3;
249 lmKind = LengthModifier::AsInt32;
250 break;
251 }
252 }
253 ++I;
254 lmKind = LengthModifier::AsInt3264;
255 break;
256 case 'w':
257 lmKind = LengthModifier::AsWide; ++I; break;
258 }
259 LengthModifier lm(lmPosition, lmKind);
260 FS.setLengthModifier(lm);
261 return true;
262 }
263
ParseUTF8InvalidSpecifier(const char * SpecifierBegin,const char * FmtStrEnd,unsigned & Len)264 bool clang::analyze_format_string::ParseUTF8InvalidSpecifier(
265 const char *SpecifierBegin, const char *FmtStrEnd, unsigned &Len) {
266 if (SpecifierBegin + 1 >= FmtStrEnd)
267 return false;
268
269 const UTF8 *SB = reinterpret_cast<const UTF8 *>(SpecifierBegin + 1);
270 const UTF8 *SE = reinterpret_cast<const UTF8 *>(FmtStrEnd);
271 const char FirstByte = *SB;
272
273 // If the invalid specifier is a multibyte UTF-8 string, return the
274 // total length accordingly so that the conversion specifier can be
275 // properly updated to reflect a complete UTF-8 specifier.
276 unsigned NumBytes = getNumBytesForUTF8(FirstByte);
277 if (NumBytes == 1)
278 return false;
279 if (SB + NumBytes > SE)
280 return false;
281
282 Len = NumBytes + 1;
283 return true;
284 }
285
286 //===----------------------------------------------------------------------===//
287 // Methods on ArgType.
288 //===----------------------------------------------------------------------===//
289
290 clang::analyze_format_string::ArgType::MatchKind
matchesType(ASTContext & C,QualType argTy) const291 ArgType::matchesType(ASTContext &C, QualType argTy) const {
292 if (Ptr) {
293 // It has to be a pointer.
294 const PointerType *PT = argTy->getAs<PointerType>();
295 if (!PT)
296 return NoMatch;
297
298 // We cannot write through a const qualified pointer.
299 if (PT->getPointeeType().isConstQualified())
300 return NoMatch;
301
302 argTy = PT->getPointeeType();
303 }
304
305 switch (K) {
306 case InvalidTy:
307 llvm_unreachable("ArgType must be valid");
308
309 case UnknownTy:
310 return Match;
311
312 case AnyCharTy: {
313 if (const EnumType *ETy = argTy->getAs<EnumType>())
314 argTy = ETy->getDecl()->getIntegerType();
315
316 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
317 switch (BT->getKind()) {
318 default:
319 break;
320 case BuiltinType::Char_S:
321 case BuiltinType::SChar:
322 case BuiltinType::UChar:
323 case BuiltinType::Char_U:
324 return Match;
325 }
326 return NoMatch;
327 }
328
329 case SpecificTy: {
330 if (const EnumType *ETy = argTy->getAs<EnumType>())
331 argTy = ETy->getDecl()->getIntegerType();
332 argTy = C.getCanonicalType(argTy).getUnqualifiedType();
333
334 if (T == argTy)
335 return Match;
336 // Check for "compatible types".
337 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
338 switch (BT->getKind()) {
339 default:
340 break;
341 case BuiltinType::Char_S:
342 case BuiltinType::SChar:
343 case BuiltinType::Char_U:
344 case BuiltinType::UChar:
345 return T == C.UnsignedCharTy || T == C.SignedCharTy ? Match
346 : NoMatch;
347 case BuiltinType::Short:
348 return T == C.UnsignedShortTy ? Match : NoMatch;
349 case BuiltinType::UShort:
350 return T == C.ShortTy ? Match : NoMatch;
351 case BuiltinType::Int:
352 return T == C.UnsignedIntTy ? Match : NoMatch;
353 case BuiltinType::UInt:
354 return T == C.IntTy ? Match : NoMatch;
355 case BuiltinType::Long:
356 return T == C.UnsignedLongTy ? Match : NoMatch;
357 case BuiltinType::ULong:
358 return T == C.LongTy ? Match : NoMatch;
359 case BuiltinType::LongLong:
360 return T == C.UnsignedLongLongTy ? Match : NoMatch;
361 case BuiltinType::ULongLong:
362 return T == C.LongLongTy ? Match : NoMatch;
363 }
364 return NoMatch;
365 }
366
367 case CStrTy: {
368 const PointerType *PT = argTy->getAs<PointerType>();
369 if (!PT)
370 return NoMatch;
371 QualType pointeeTy = PT->getPointeeType();
372 if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
373 switch (BT->getKind()) {
374 case BuiltinType::Void:
375 case BuiltinType::Char_U:
376 case BuiltinType::UChar:
377 case BuiltinType::Char_S:
378 case BuiltinType::SChar:
379 return Match;
380 default:
381 break;
382 }
383
384 return NoMatch;
385 }
386
387 case WCStrTy: {
388 const PointerType *PT = argTy->getAs<PointerType>();
389 if (!PT)
390 return NoMatch;
391 QualType pointeeTy =
392 C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
393 return pointeeTy == C.getWideCharType() ? Match : NoMatch;
394 }
395
396 case WIntTy: {
397
398 QualType PromoArg =
399 argTy->isPromotableIntegerType()
400 ? C.getPromotedIntegerType(argTy) : argTy;
401
402 QualType WInt = C.getCanonicalType(C.getWIntType()).getUnqualifiedType();
403 PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
404
405 // If the promoted argument is the corresponding signed type of the
406 // wint_t type, then it should match.
407 if (PromoArg->hasSignedIntegerRepresentation() &&
408 C.getCorrespondingUnsignedType(PromoArg) == WInt)
409 return Match;
410
411 return WInt == PromoArg ? Match : NoMatch;
412 }
413
414 case CPointerTy:
415 if (argTy->isVoidPointerType()) {
416 return Match;
417 } if (argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
418 argTy->isBlockPointerType() || argTy->isNullPtrType()) {
419 return NoMatchPedantic;
420 } else {
421 return NoMatch;
422 }
423
424 case ObjCPointerTy: {
425 if (argTy->getAs<ObjCObjectPointerType>() ||
426 argTy->getAs<BlockPointerType>())
427 return Match;
428
429 // Handle implicit toll-free bridging.
430 if (const PointerType *PT = argTy->getAs<PointerType>()) {
431 // Things such as CFTypeRef are really just opaque pointers
432 // to C structs representing CF types that can often be bridged
433 // to Objective-C objects. Since the compiler doesn't know which
434 // structs can be toll-free bridged, we just accept them all.
435 QualType pointee = PT->getPointeeType();
436 if (pointee->getAsStructureType() || pointee->isVoidType())
437 return Match;
438 }
439 return NoMatch;
440 }
441 }
442
443 llvm_unreachable("Invalid ArgType Kind!");
444 }
445
getRepresentativeType(ASTContext & C) const446 QualType ArgType::getRepresentativeType(ASTContext &C) const {
447 QualType Res;
448 switch (K) {
449 case InvalidTy:
450 llvm_unreachable("No representative type for Invalid ArgType");
451 case UnknownTy:
452 llvm_unreachable("No representative type for Unknown ArgType");
453 case AnyCharTy:
454 Res = C.CharTy;
455 break;
456 case SpecificTy:
457 Res = T;
458 break;
459 case CStrTy:
460 Res = C.getPointerType(C.CharTy);
461 break;
462 case WCStrTy:
463 Res = C.getPointerType(C.getWideCharType());
464 break;
465 case ObjCPointerTy:
466 Res = C.ObjCBuiltinIdTy;
467 break;
468 case CPointerTy:
469 Res = C.VoidPtrTy;
470 break;
471 case WIntTy: {
472 Res = C.getWIntType();
473 break;
474 }
475 }
476
477 if (Ptr)
478 Res = C.getPointerType(Res);
479 return Res;
480 }
481
getRepresentativeTypeName(ASTContext & C) const482 std::string ArgType::getRepresentativeTypeName(ASTContext &C) const {
483 std::string S = getRepresentativeType(C).getAsString();
484
485 std::string Alias;
486 if (Name) {
487 // Use a specific name for this type, e.g. "size_t".
488 Alias = Name;
489 if (Ptr) {
490 // If ArgType is actually a pointer to T, append an asterisk.
491 Alias += (Alias[Alias.size()-1] == '*') ? "*" : " *";
492 }
493 // If Alias is the same as the underlying type, e.g. wchar_t, then drop it.
494 if (S == Alias)
495 Alias.clear();
496 }
497
498 if (!Alias.empty())
499 return std::string("'") + Alias + "' (aka '" + S + "')";
500 return std::string("'") + S + "'";
501 }
502
503
504 //===----------------------------------------------------------------------===//
505 // Methods on OptionalAmount.
506 //===----------------------------------------------------------------------===//
507
508 ArgType
getArgType(ASTContext & Ctx) const509 analyze_format_string::OptionalAmount::getArgType(ASTContext &Ctx) const {
510 return Ctx.IntTy;
511 }
512
513 //===----------------------------------------------------------------------===//
514 // Methods on LengthModifier.
515 //===----------------------------------------------------------------------===//
516
517 const char *
toString() const518 analyze_format_string::LengthModifier::toString() const {
519 switch (kind) {
520 case AsChar:
521 return "hh";
522 case AsShort:
523 return "h";
524 case AsLong: // or AsWideChar
525 return "l";
526 case AsLongLong:
527 return "ll";
528 case AsQuad:
529 return "q";
530 case AsIntMax:
531 return "j";
532 case AsSizeT:
533 return "z";
534 case AsPtrDiff:
535 return "t";
536 case AsInt32:
537 return "I32";
538 case AsInt3264:
539 return "I";
540 case AsInt64:
541 return "I64";
542 case AsLongDouble:
543 return "L";
544 case AsAllocate:
545 return "a";
546 case AsMAllocate:
547 return "m";
548 case AsWide:
549 return "w";
550 case None:
551 return "";
552 }
553 return nullptr;
554 }
555
556 //===----------------------------------------------------------------------===//
557 // Methods on ConversionSpecifier.
558 //===----------------------------------------------------------------------===//
559
toString() const560 const char *ConversionSpecifier::toString() const {
561 switch (kind) {
562 case dArg: return "d";
563 case DArg: return "D";
564 case iArg: return "i";
565 case oArg: return "o";
566 case OArg: return "O";
567 case uArg: return "u";
568 case UArg: return "U";
569 case xArg: return "x";
570 case XArg: return "X";
571 case fArg: return "f";
572 case FArg: return "F";
573 case eArg: return "e";
574 case EArg: return "E";
575 case gArg: return "g";
576 case GArg: return "G";
577 case aArg: return "a";
578 case AArg: return "A";
579 case cArg: return "c";
580 case sArg: return "s";
581 case pArg: return "p";
582 case nArg: return "n";
583 case PercentArg: return "%";
584 case ScanListArg: return "[";
585 case InvalidSpecifier: return nullptr;
586
587 // POSIX unicode extensions.
588 case CArg: return "C";
589 case SArg: return "S";
590
591 // Objective-C specific specifiers.
592 case ObjCObjArg: return "@";
593
594 // FreeBSD kernel specific specifiers.
595 case FreeBSDbArg: return "b";
596 case FreeBSDDArg: return "D";
597 case FreeBSDrArg: return "r";
598 case FreeBSDyArg: return "y";
599
600 // GlibC specific specifiers.
601 case PrintErrno: return "m";
602
603 // MS specific specifiers.
604 case ZArg: return "Z";
605 }
606 return nullptr;
607 }
608
609 Optional<ConversionSpecifier>
getStandardSpecifier() const610 ConversionSpecifier::getStandardSpecifier() const {
611 ConversionSpecifier::Kind NewKind;
612
613 switch (getKind()) {
614 default:
615 return None;
616 case DArg:
617 NewKind = dArg;
618 break;
619 case UArg:
620 NewKind = uArg;
621 break;
622 case OArg:
623 NewKind = oArg;
624 break;
625 }
626
627 ConversionSpecifier FixedCS(*this);
628 FixedCS.setKind(NewKind);
629 return FixedCS;
630 }
631
632 //===----------------------------------------------------------------------===//
633 // Methods on OptionalAmount.
634 //===----------------------------------------------------------------------===//
635
toString(raw_ostream & os) const636 void OptionalAmount::toString(raw_ostream &os) const {
637 switch (hs) {
638 case Invalid:
639 case NotSpecified:
640 return;
641 case Arg:
642 if (UsesDotPrefix)
643 os << ".";
644 if (usesPositionalArg())
645 os << "*" << getPositionalArgIndex() << "$";
646 else
647 os << "*";
648 break;
649 case Constant:
650 if (UsesDotPrefix)
651 os << ".";
652 os << amt;
653 break;
654 }
655 }
656
hasValidLengthModifier(const TargetInfo & Target) const657 bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target) const {
658 switch (LM.getKind()) {
659 case LengthModifier::None:
660 return true;
661
662 // Handle most integer flags
663 case LengthModifier::AsShort:
664 if (Target.getTriple().isOSMSVCRT()) {
665 switch (CS.getKind()) {
666 case ConversionSpecifier::cArg:
667 case ConversionSpecifier::CArg:
668 case ConversionSpecifier::sArg:
669 case ConversionSpecifier::SArg:
670 case ConversionSpecifier::ZArg:
671 return true;
672 default:
673 break;
674 }
675 }
676 // Fall through.
677 case LengthModifier::AsChar:
678 case LengthModifier::AsLongLong:
679 case LengthModifier::AsQuad:
680 case LengthModifier::AsIntMax:
681 case LengthModifier::AsSizeT:
682 case LengthModifier::AsPtrDiff:
683 switch (CS.getKind()) {
684 case ConversionSpecifier::dArg:
685 case ConversionSpecifier::DArg:
686 case ConversionSpecifier::iArg:
687 case ConversionSpecifier::oArg:
688 case ConversionSpecifier::OArg:
689 case ConversionSpecifier::uArg:
690 case ConversionSpecifier::UArg:
691 case ConversionSpecifier::xArg:
692 case ConversionSpecifier::XArg:
693 case ConversionSpecifier::nArg:
694 return true;
695 case ConversionSpecifier::FreeBSDrArg:
696 case ConversionSpecifier::FreeBSDyArg:
697 return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
698 default:
699 return false;
700 }
701
702 // Handle 'l' flag
703 case LengthModifier::AsLong: // or AsWideChar
704 switch (CS.getKind()) {
705 case ConversionSpecifier::dArg:
706 case ConversionSpecifier::DArg:
707 case ConversionSpecifier::iArg:
708 case ConversionSpecifier::oArg:
709 case ConversionSpecifier::OArg:
710 case ConversionSpecifier::uArg:
711 case ConversionSpecifier::UArg:
712 case ConversionSpecifier::xArg:
713 case ConversionSpecifier::XArg:
714 case ConversionSpecifier::aArg:
715 case ConversionSpecifier::AArg:
716 case ConversionSpecifier::fArg:
717 case ConversionSpecifier::FArg:
718 case ConversionSpecifier::eArg:
719 case ConversionSpecifier::EArg:
720 case ConversionSpecifier::gArg:
721 case ConversionSpecifier::GArg:
722 case ConversionSpecifier::nArg:
723 case ConversionSpecifier::cArg:
724 case ConversionSpecifier::sArg:
725 case ConversionSpecifier::ScanListArg:
726 case ConversionSpecifier::ZArg:
727 return true;
728 case ConversionSpecifier::FreeBSDrArg:
729 case ConversionSpecifier::FreeBSDyArg:
730 return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
731 default:
732 return false;
733 }
734
735 case LengthModifier::AsLongDouble:
736 switch (CS.getKind()) {
737 case ConversionSpecifier::aArg:
738 case ConversionSpecifier::AArg:
739 case ConversionSpecifier::fArg:
740 case ConversionSpecifier::FArg:
741 case ConversionSpecifier::eArg:
742 case ConversionSpecifier::EArg:
743 case ConversionSpecifier::gArg:
744 case ConversionSpecifier::GArg:
745 return true;
746 // GNU libc extension.
747 case ConversionSpecifier::dArg:
748 case ConversionSpecifier::iArg:
749 case ConversionSpecifier::oArg:
750 case ConversionSpecifier::uArg:
751 case ConversionSpecifier::xArg:
752 case ConversionSpecifier::XArg:
753 return !Target.getTriple().isOSDarwin() &&
754 !Target.getTriple().isOSWindows();
755 default:
756 return false;
757 }
758
759 case LengthModifier::AsAllocate:
760 switch (CS.getKind()) {
761 case ConversionSpecifier::sArg:
762 case ConversionSpecifier::SArg:
763 case ConversionSpecifier::ScanListArg:
764 return true;
765 default:
766 return false;
767 }
768
769 case LengthModifier::AsMAllocate:
770 switch (CS.getKind()) {
771 case ConversionSpecifier::cArg:
772 case ConversionSpecifier::CArg:
773 case ConversionSpecifier::sArg:
774 case ConversionSpecifier::SArg:
775 case ConversionSpecifier::ScanListArg:
776 return true;
777 default:
778 return false;
779 }
780 case LengthModifier::AsInt32:
781 case LengthModifier::AsInt3264:
782 case LengthModifier::AsInt64:
783 switch (CS.getKind()) {
784 case ConversionSpecifier::dArg:
785 case ConversionSpecifier::iArg:
786 case ConversionSpecifier::oArg:
787 case ConversionSpecifier::uArg:
788 case ConversionSpecifier::xArg:
789 case ConversionSpecifier::XArg:
790 return Target.getTriple().isOSMSVCRT();
791 default:
792 return false;
793 }
794 case LengthModifier::AsWide:
795 switch (CS.getKind()) {
796 case ConversionSpecifier::cArg:
797 case ConversionSpecifier::CArg:
798 case ConversionSpecifier::sArg:
799 case ConversionSpecifier::SArg:
800 case ConversionSpecifier::ZArg:
801 return Target.getTriple().isOSMSVCRT();
802 default:
803 return false;
804 }
805 }
806 llvm_unreachable("Invalid LengthModifier Kind!");
807 }
808
hasStandardLengthModifier() const809 bool FormatSpecifier::hasStandardLengthModifier() const {
810 switch (LM.getKind()) {
811 case LengthModifier::None:
812 case LengthModifier::AsChar:
813 case LengthModifier::AsShort:
814 case LengthModifier::AsLong:
815 case LengthModifier::AsLongLong:
816 case LengthModifier::AsIntMax:
817 case LengthModifier::AsSizeT:
818 case LengthModifier::AsPtrDiff:
819 case LengthModifier::AsLongDouble:
820 return true;
821 case LengthModifier::AsAllocate:
822 case LengthModifier::AsMAllocate:
823 case LengthModifier::AsQuad:
824 case LengthModifier::AsInt32:
825 case LengthModifier::AsInt3264:
826 case LengthModifier::AsInt64:
827 case LengthModifier::AsWide:
828 return false;
829 }
830 llvm_unreachable("Invalid LengthModifier Kind!");
831 }
832
hasStandardConversionSpecifier(const LangOptions & LangOpt) const833 bool FormatSpecifier::hasStandardConversionSpecifier(
834 const LangOptions &LangOpt) const {
835 switch (CS.getKind()) {
836 case ConversionSpecifier::cArg:
837 case ConversionSpecifier::dArg:
838 case ConversionSpecifier::iArg:
839 case ConversionSpecifier::oArg:
840 case ConversionSpecifier::uArg:
841 case ConversionSpecifier::xArg:
842 case ConversionSpecifier::XArg:
843 case ConversionSpecifier::fArg:
844 case ConversionSpecifier::FArg:
845 case ConversionSpecifier::eArg:
846 case ConversionSpecifier::EArg:
847 case ConversionSpecifier::gArg:
848 case ConversionSpecifier::GArg:
849 case ConversionSpecifier::aArg:
850 case ConversionSpecifier::AArg:
851 case ConversionSpecifier::sArg:
852 case ConversionSpecifier::pArg:
853 case ConversionSpecifier::nArg:
854 case ConversionSpecifier::ObjCObjArg:
855 case ConversionSpecifier::ScanListArg:
856 case ConversionSpecifier::PercentArg:
857 return true;
858 case ConversionSpecifier::CArg:
859 case ConversionSpecifier::SArg:
860 return LangOpt.ObjC1 || LangOpt.ObjC2;
861 case ConversionSpecifier::InvalidSpecifier:
862 case ConversionSpecifier::FreeBSDbArg:
863 case ConversionSpecifier::FreeBSDDArg:
864 case ConversionSpecifier::FreeBSDrArg:
865 case ConversionSpecifier::FreeBSDyArg:
866 case ConversionSpecifier::PrintErrno:
867 case ConversionSpecifier::DArg:
868 case ConversionSpecifier::OArg:
869 case ConversionSpecifier::UArg:
870 case ConversionSpecifier::ZArg:
871 return false;
872 }
873 llvm_unreachable("Invalid ConversionSpecifier Kind!");
874 }
875
hasStandardLengthConversionCombination() const876 bool FormatSpecifier::hasStandardLengthConversionCombination() const {
877 if (LM.getKind() == LengthModifier::AsLongDouble) {
878 switch(CS.getKind()) {
879 case ConversionSpecifier::dArg:
880 case ConversionSpecifier::iArg:
881 case ConversionSpecifier::oArg:
882 case ConversionSpecifier::uArg:
883 case ConversionSpecifier::xArg:
884 case ConversionSpecifier::XArg:
885 return false;
886 default:
887 return true;
888 }
889 }
890 return true;
891 }
892
getCorrectedLengthModifier() const893 Optional<LengthModifier> FormatSpecifier::getCorrectedLengthModifier() const {
894 if (CS.isAnyIntArg() || CS.getKind() == ConversionSpecifier::nArg) {
895 if (LM.getKind() == LengthModifier::AsLongDouble ||
896 LM.getKind() == LengthModifier::AsQuad) {
897 LengthModifier FixedLM(LM);
898 FixedLM.setKind(LengthModifier::AsLongLong);
899 return FixedLM;
900 }
901 }
902
903 return None;
904 }
905
namedTypeToLengthModifier(QualType QT,LengthModifier & LM)906 bool FormatSpecifier::namedTypeToLengthModifier(QualType QT,
907 LengthModifier &LM) {
908 assert(isa<TypedefType>(QT) && "Expected a TypedefType");
909 const TypedefNameDecl *Typedef = cast<TypedefType>(QT)->getDecl();
910
911 for (;;) {
912 const IdentifierInfo *Identifier = Typedef->getIdentifier();
913 if (Identifier->getName() == "size_t") {
914 LM.setKind(LengthModifier::AsSizeT);
915 return true;
916 } else if (Identifier->getName() == "ssize_t") {
917 // Not C99, but common in Unix.
918 LM.setKind(LengthModifier::AsSizeT);
919 return true;
920 } else if (Identifier->getName() == "intmax_t") {
921 LM.setKind(LengthModifier::AsIntMax);
922 return true;
923 } else if (Identifier->getName() == "uintmax_t") {
924 LM.setKind(LengthModifier::AsIntMax);
925 return true;
926 } else if (Identifier->getName() == "ptrdiff_t") {
927 LM.setKind(LengthModifier::AsPtrDiff);
928 return true;
929 }
930
931 QualType T = Typedef->getUnderlyingType();
932 if (!isa<TypedefType>(T))
933 break;
934
935 Typedef = cast<TypedefType>(T)->getDecl();
936 }
937 return false;
938 }
939