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
19 using clang::analyze_format_string::ArgType;
20 using clang::analyze_format_string::FormatStringHandler;
21 using clang::analyze_format_string::FormatSpecifier;
22 using clang::analyze_format_string::LengthModifier;
23 using clang::analyze_format_string::OptionalAmount;
24 using clang::analyze_format_string::PositionContext;
25 using clang::analyze_format_string::ConversionSpecifier;
26 using namespace clang;
27
28 // Key function to FormatStringHandler.
~FormatStringHandler()29 FormatStringHandler::~FormatStringHandler() {}
30
31 //===----------------------------------------------------------------------===//
32 // Functions for parsing format strings components in both printf and
33 // scanf format strings.
34 //===----------------------------------------------------------------------===//
35
36 OptionalAmount
ParseAmount(const char * & Beg,const char * E)37 clang::analyze_format_string::ParseAmount(const char *&Beg, const char *E) {
38 const char *I = Beg;
39 UpdateOnReturn <const char*> UpdateBeg(Beg, I);
40
41 unsigned accumulator = 0;
42 bool hasDigits = false;
43
44 for ( ; I != E; ++I) {
45 char c = *I;
46 if (c >= '0' && c <= '9') {
47 hasDigits = true;
48 accumulator = (accumulator * 10) + (c - '0');
49 continue;
50 }
51
52 if (hasDigits)
53 return OptionalAmount(OptionalAmount::Constant, accumulator, Beg, I - Beg,
54 false);
55
56 break;
57 }
58
59 return OptionalAmount();
60 }
61
62 OptionalAmount
ParseNonPositionAmount(const char * & Beg,const char * E,unsigned & argIndex)63 clang::analyze_format_string::ParseNonPositionAmount(const char *&Beg,
64 const char *E,
65 unsigned &argIndex) {
66 if (*Beg == '*') {
67 ++Beg;
68 return OptionalAmount(OptionalAmount::Arg, argIndex++, Beg, 0, false);
69 }
70
71 return ParseAmount(Beg, E);
72 }
73
74 OptionalAmount
ParsePositionAmount(FormatStringHandler & H,const char * Start,const char * & Beg,const char * E,PositionContext p)75 clang::analyze_format_string::ParsePositionAmount(FormatStringHandler &H,
76 const char *Start,
77 const char *&Beg,
78 const char *E,
79 PositionContext p) {
80 if (*Beg == '*') {
81 const char *I = Beg + 1;
82 const OptionalAmount &Amt = ParseAmount(I, E);
83
84 if (Amt.getHowSpecified() == OptionalAmount::NotSpecified) {
85 H.HandleInvalidPosition(Beg, I - Beg, p);
86 return OptionalAmount(false);
87 }
88
89 if (I == E) {
90 // No more characters left?
91 H.HandleIncompleteSpecifier(Start, E - Start);
92 return OptionalAmount(false);
93 }
94
95 assert(Amt.getHowSpecified() == OptionalAmount::Constant);
96
97 if (*I == '$') {
98 // Handle positional arguments
99
100 // Special case: '*0$', since this is an easy mistake.
101 if (Amt.getConstantAmount() == 0) {
102 H.HandleZeroPosition(Beg, I - Beg + 1);
103 return OptionalAmount(false);
104 }
105
106 const char *Tmp = Beg;
107 Beg = ++I;
108
109 return OptionalAmount(OptionalAmount::Arg, Amt.getConstantAmount() - 1,
110 Tmp, 0, true);
111 }
112
113 H.HandleInvalidPosition(Beg, I - Beg, p);
114 return OptionalAmount(false);
115 }
116
117 return ParseAmount(Beg, E);
118 }
119
120
121 bool
ParseFieldWidth(FormatStringHandler & H,FormatSpecifier & CS,const char * Start,const char * & Beg,const char * E,unsigned * argIndex)122 clang::analyze_format_string::ParseFieldWidth(FormatStringHandler &H,
123 FormatSpecifier &CS,
124 const char *Start,
125 const char *&Beg, const char *E,
126 unsigned *argIndex) {
127 // FIXME: Support negative field widths.
128 if (argIndex) {
129 CS.setFieldWidth(ParseNonPositionAmount(Beg, E, *argIndex));
130 }
131 else {
132 const OptionalAmount Amt =
133 ParsePositionAmount(H, Start, Beg, E,
134 analyze_format_string::FieldWidthPos);
135
136 if (Amt.isInvalid())
137 return true;
138 CS.setFieldWidth(Amt);
139 }
140 return false;
141 }
142
143 bool
ParseArgPosition(FormatStringHandler & H,FormatSpecifier & FS,const char * Start,const char * & Beg,const char * E)144 clang::analyze_format_string::ParseArgPosition(FormatStringHandler &H,
145 FormatSpecifier &FS,
146 const char *Start,
147 const char *&Beg,
148 const char *E) {
149 const char *I = Beg;
150
151 const OptionalAmount &Amt = ParseAmount(I, E);
152
153 if (I == E) {
154 // No more characters left?
155 H.HandleIncompleteSpecifier(Start, E - Start);
156 return true;
157 }
158
159 if (Amt.getHowSpecified() == OptionalAmount::Constant && *(I++) == '$') {
160 // Warn that positional arguments are non-standard.
161 H.HandlePosition(Start, I - Start);
162
163 // Special case: '%0$', since this is an easy mistake.
164 if (Amt.getConstantAmount() == 0) {
165 H.HandleZeroPosition(Start, I - Start);
166 return true;
167 }
168
169 FS.setArgIndex(Amt.getConstantAmount() - 1);
170 FS.setUsesPositionalArg();
171 // Update the caller's pointer if we decided to consume
172 // these characters.
173 Beg = I;
174 return false;
175 }
176
177 return false;
178 }
179
180 bool
ParseLengthModifier(FormatSpecifier & FS,const char * & I,const char * E,const LangOptions & LO,bool IsScanf)181 clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
182 const char *&I,
183 const char *E,
184 const LangOptions &LO,
185 bool IsScanf) {
186 LengthModifier::Kind lmKind = LengthModifier::None;
187 const char *lmPosition = I;
188 switch (*I) {
189 default:
190 return false;
191 case 'h':
192 ++I;
193 lmKind = (I != E && *I == 'h') ? (++I, LengthModifier::AsChar)
194 : LengthModifier::AsShort;
195 break;
196 case 'l':
197 ++I;
198 lmKind = (I != E && *I == 'l') ? (++I, LengthModifier::AsLongLong)
199 : LengthModifier::AsLong;
200 break;
201 case 'j': lmKind = LengthModifier::AsIntMax; ++I; break;
202 case 'z': lmKind = LengthModifier::AsSizeT; ++I; break;
203 case 't': lmKind = LengthModifier::AsPtrDiff; ++I; break;
204 case 'L': lmKind = LengthModifier::AsLongDouble; ++I; break;
205 case 'q': lmKind = LengthModifier::AsQuad; ++I; break;
206 case 'a':
207 if (IsScanf && !LO.C99 && !LO.CPlusPlus11) {
208 // For scanf in C90, look at the next character to see if this should
209 // be parsed as the GNU extension 'a' length modifier. If not, this
210 // will be parsed as a conversion specifier.
211 ++I;
212 if (I != E && (*I == 's' || *I == 'S' || *I == '[')) {
213 lmKind = LengthModifier::AsAllocate;
214 break;
215 }
216 --I;
217 }
218 return false;
219 case 'm':
220 if (IsScanf) {
221 lmKind = LengthModifier::AsMAllocate;
222 ++I;
223 break;
224 }
225 return false;
226 // printf: AsInt64, AsInt32, AsInt3264
227 // scanf: AsInt64
228 case 'I':
229 if (I + 1 != E && I + 2 != E) {
230 if (I[1] == '6' && I[2] == '4') {
231 I += 3;
232 lmKind = LengthModifier::AsInt64;
233 break;
234 }
235 if (IsScanf)
236 return false;
237
238 if (I[1] == '3' && I[2] == '2') {
239 I += 3;
240 lmKind = LengthModifier::AsInt32;
241 break;
242 }
243 }
244 ++I;
245 lmKind = LengthModifier::AsInt3264;
246 break;
247 }
248 LengthModifier lm(lmPosition, lmKind);
249 FS.setLengthModifier(lm);
250 return true;
251 }
252
253 //===----------------------------------------------------------------------===//
254 // Methods on ArgType.
255 //===----------------------------------------------------------------------===//
256
matchesType(ASTContext & C,QualType argTy) const257 bool ArgType::matchesType(ASTContext &C, QualType argTy) const {
258 if (Ptr) {
259 // It has to be a pointer.
260 const PointerType *PT = argTy->getAs<PointerType>();
261 if (!PT)
262 return false;
263
264 // We cannot write through a const qualified pointer.
265 if (PT->getPointeeType().isConstQualified())
266 return false;
267
268 argTy = PT->getPointeeType();
269 }
270
271 switch (K) {
272 case InvalidTy:
273 llvm_unreachable("ArgType must be valid");
274
275 case UnknownTy:
276 return true;
277
278 case AnyCharTy: {
279 if (const EnumType *ETy = argTy->getAs<EnumType>())
280 argTy = ETy->getDecl()->getIntegerType();
281
282 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
283 switch (BT->getKind()) {
284 default:
285 break;
286 case BuiltinType::Char_S:
287 case BuiltinType::SChar:
288 case BuiltinType::UChar:
289 case BuiltinType::Char_U:
290 return true;
291 }
292 return false;
293 }
294
295 case SpecificTy: {
296 if (const EnumType *ETy = argTy->getAs<EnumType>())
297 argTy = ETy->getDecl()->getIntegerType();
298 argTy = C.getCanonicalType(argTy).getUnqualifiedType();
299
300 if (T == argTy)
301 return true;
302 // Check for "compatible types".
303 if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
304 switch (BT->getKind()) {
305 default:
306 break;
307 case BuiltinType::Char_S:
308 case BuiltinType::SChar:
309 case BuiltinType::Char_U:
310 case BuiltinType::UChar:
311 return T == C.UnsignedCharTy || T == C.SignedCharTy;
312 case BuiltinType::Short:
313 return T == C.UnsignedShortTy;
314 case BuiltinType::UShort:
315 return T == C.ShortTy;
316 case BuiltinType::Int:
317 return T == C.UnsignedIntTy;
318 case BuiltinType::UInt:
319 return T == C.IntTy;
320 case BuiltinType::Long:
321 return T == C.UnsignedLongTy;
322 case BuiltinType::ULong:
323 return T == C.LongTy;
324 case BuiltinType::LongLong:
325 return T == C.UnsignedLongLongTy;
326 case BuiltinType::ULongLong:
327 return T == C.LongLongTy;
328 }
329 return false;
330 }
331
332 case CStrTy: {
333 const PointerType *PT = argTy->getAs<PointerType>();
334 if (!PT)
335 return false;
336 QualType pointeeTy = PT->getPointeeType();
337 if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
338 switch (BT->getKind()) {
339 case BuiltinType::Void:
340 case BuiltinType::Char_U:
341 case BuiltinType::UChar:
342 case BuiltinType::Char_S:
343 case BuiltinType::SChar:
344 return true;
345 default:
346 break;
347 }
348
349 return false;
350 }
351
352 case WCStrTy: {
353 const PointerType *PT = argTy->getAs<PointerType>();
354 if (!PT)
355 return false;
356 QualType pointeeTy =
357 C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
358 return pointeeTy == C.getWideCharType();
359 }
360
361 case WIntTy: {
362
363 QualType PromoArg =
364 argTy->isPromotableIntegerType()
365 ? C.getPromotedIntegerType(argTy) : argTy;
366
367 QualType WInt = C.getCanonicalType(C.getWIntType()).getUnqualifiedType();
368 PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
369
370 // If the promoted argument is the corresponding signed type of the
371 // wint_t type, then it should match.
372 if (PromoArg->hasSignedIntegerRepresentation() &&
373 C.getCorrespondingUnsignedType(PromoArg) == WInt)
374 return true;
375
376 return WInt == PromoArg;
377 }
378
379 case CPointerTy:
380 return argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
381 argTy->isBlockPointerType() || argTy->isNullPtrType();
382
383 case ObjCPointerTy: {
384 if (argTy->getAs<ObjCObjectPointerType>() ||
385 argTy->getAs<BlockPointerType>())
386 return true;
387
388 // Handle implicit toll-free bridging.
389 if (const PointerType *PT = argTy->getAs<PointerType>()) {
390 // Things such as CFTypeRef are really just opaque pointers
391 // to C structs representing CF types that can often be bridged
392 // to Objective-C objects. Since the compiler doesn't know which
393 // structs can be toll-free bridged, we just accept them all.
394 QualType pointee = PT->getPointeeType();
395 if (pointee->getAsStructureType() || pointee->isVoidType())
396 return true;
397 }
398 return false;
399 }
400 }
401
402 llvm_unreachable("Invalid ArgType Kind!");
403 }
404
getRepresentativeType(ASTContext & C) const405 QualType ArgType::getRepresentativeType(ASTContext &C) const {
406 QualType Res;
407 switch (K) {
408 case InvalidTy:
409 llvm_unreachable("No representative type for Invalid ArgType");
410 case UnknownTy:
411 llvm_unreachable("No representative type for Unknown ArgType");
412 case AnyCharTy:
413 Res = C.CharTy;
414 break;
415 case SpecificTy:
416 Res = T;
417 break;
418 case CStrTy:
419 Res = C.getPointerType(C.CharTy);
420 break;
421 case WCStrTy:
422 Res = C.getPointerType(C.getWideCharType());
423 break;
424 case ObjCPointerTy:
425 Res = C.ObjCBuiltinIdTy;
426 break;
427 case CPointerTy:
428 Res = C.VoidPtrTy;
429 break;
430 case WIntTy: {
431 Res = C.getWIntType();
432 break;
433 }
434 }
435
436 if (Ptr)
437 Res = C.getPointerType(Res);
438 return Res;
439 }
440
getRepresentativeTypeName(ASTContext & C) const441 std::string ArgType::getRepresentativeTypeName(ASTContext &C) const {
442 std::string S = getRepresentativeType(C).getAsString();
443
444 std::string Alias;
445 if (Name) {
446 // Use a specific name for this type, e.g. "size_t".
447 Alias = Name;
448 if (Ptr) {
449 // If ArgType is actually a pointer to T, append an asterisk.
450 Alias += (Alias[Alias.size()-1] == '*') ? "*" : " *";
451 }
452 // If Alias is the same as the underlying type, e.g. wchar_t, then drop it.
453 if (S == Alias)
454 Alias.clear();
455 }
456
457 if (!Alias.empty())
458 return std::string("'") + Alias + "' (aka '" + S + "')";
459 return std::string("'") + S + "'";
460 }
461
462
463 //===----------------------------------------------------------------------===//
464 // Methods on OptionalAmount.
465 //===----------------------------------------------------------------------===//
466
467 ArgType
getArgType(ASTContext & Ctx) const468 analyze_format_string::OptionalAmount::getArgType(ASTContext &Ctx) const {
469 return Ctx.IntTy;
470 }
471
472 //===----------------------------------------------------------------------===//
473 // Methods on LengthModifier.
474 //===----------------------------------------------------------------------===//
475
476 const char *
toString() const477 analyze_format_string::LengthModifier::toString() const {
478 switch (kind) {
479 case AsChar:
480 return "hh";
481 case AsShort:
482 return "h";
483 case AsLong: // or AsWideChar
484 return "l";
485 case AsLongLong:
486 return "ll";
487 case AsQuad:
488 return "q";
489 case AsIntMax:
490 return "j";
491 case AsSizeT:
492 return "z";
493 case AsPtrDiff:
494 return "t";
495 case AsInt32:
496 return "I32";
497 case AsInt3264:
498 return "I";
499 case AsInt64:
500 return "I64";
501 case AsLongDouble:
502 return "L";
503 case AsAllocate:
504 return "a";
505 case AsMAllocate:
506 return "m";
507 case None:
508 return "";
509 }
510 return NULL;
511 }
512
513 //===----------------------------------------------------------------------===//
514 // Methods on ConversionSpecifier.
515 //===----------------------------------------------------------------------===//
516
toString() const517 const char *ConversionSpecifier::toString() const {
518 switch (kind) {
519 case dArg: return "d";
520 case DArg: return "D";
521 case iArg: return "i";
522 case oArg: return "o";
523 case OArg: return "O";
524 case uArg: return "u";
525 case UArg: return "U";
526 case xArg: return "x";
527 case XArg: return "X";
528 case fArg: return "f";
529 case FArg: return "F";
530 case eArg: return "e";
531 case EArg: return "E";
532 case gArg: return "g";
533 case GArg: return "G";
534 case aArg: return "a";
535 case AArg: return "A";
536 case cArg: return "c";
537 case sArg: return "s";
538 case pArg: return "p";
539 case nArg: return "n";
540 case PercentArg: return "%";
541 case ScanListArg: return "[";
542 case InvalidSpecifier: return NULL;
543
544 // POSIX unicode extensions.
545 case CArg: return "C";
546 case SArg: return "S";
547
548 // Objective-C specific specifiers.
549 case ObjCObjArg: return "@";
550
551 // FreeBSD specific specifiers.
552 case FreeBSDbArg: return "b";
553 case FreeBSDDArg: return "D";
554 case FreeBSDrArg: return "r";
555
556 // GlibC specific specifiers.
557 case PrintErrno: return "m";
558 }
559 return NULL;
560 }
561
562 Optional<ConversionSpecifier>
getStandardSpecifier() const563 ConversionSpecifier::getStandardSpecifier() const {
564 ConversionSpecifier::Kind NewKind;
565
566 switch (getKind()) {
567 default:
568 return None;
569 case DArg:
570 NewKind = dArg;
571 break;
572 case UArg:
573 NewKind = uArg;
574 break;
575 case OArg:
576 NewKind = oArg;
577 break;
578 }
579
580 ConversionSpecifier FixedCS(*this);
581 FixedCS.setKind(NewKind);
582 return FixedCS;
583 }
584
585 //===----------------------------------------------------------------------===//
586 // Methods on OptionalAmount.
587 //===----------------------------------------------------------------------===//
588
toString(raw_ostream & os) const589 void OptionalAmount::toString(raw_ostream &os) const {
590 switch (hs) {
591 case Invalid:
592 case NotSpecified:
593 return;
594 case Arg:
595 if (UsesDotPrefix)
596 os << ".";
597 if (usesPositionalArg())
598 os << "*" << getPositionalArgIndex() << "$";
599 else
600 os << "*";
601 break;
602 case Constant:
603 if (UsesDotPrefix)
604 os << ".";
605 os << amt;
606 break;
607 }
608 }
609
hasValidLengthModifier(const TargetInfo & Target) const610 bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target) const {
611 switch (LM.getKind()) {
612 case LengthModifier::None:
613 return true;
614
615 // Handle most integer flags
616 case LengthModifier::AsChar:
617 case LengthModifier::AsShort:
618 case LengthModifier::AsLongLong:
619 case LengthModifier::AsQuad:
620 case LengthModifier::AsIntMax:
621 case LengthModifier::AsSizeT:
622 case LengthModifier::AsPtrDiff:
623 switch (CS.getKind()) {
624 case ConversionSpecifier::dArg:
625 case ConversionSpecifier::DArg:
626 case ConversionSpecifier::iArg:
627 case ConversionSpecifier::oArg:
628 case ConversionSpecifier::OArg:
629 case ConversionSpecifier::uArg:
630 case ConversionSpecifier::UArg:
631 case ConversionSpecifier::xArg:
632 case ConversionSpecifier::XArg:
633 case ConversionSpecifier::nArg:
634 case ConversionSpecifier::FreeBSDrArg:
635 return true;
636 default:
637 return false;
638 }
639
640 // Handle 'l' flag
641 case LengthModifier::AsLong:
642 switch (CS.getKind()) {
643 case ConversionSpecifier::dArg:
644 case ConversionSpecifier::DArg:
645 case ConversionSpecifier::iArg:
646 case ConversionSpecifier::oArg:
647 case ConversionSpecifier::OArg:
648 case ConversionSpecifier::uArg:
649 case ConversionSpecifier::UArg:
650 case ConversionSpecifier::xArg:
651 case ConversionSpecifier::XArg:
652 case ConversionSpecifier::aArg:
653 case ConversionSpecifier::AArg:
654 case ConversionSpecifier::fArg:
655 case ConversionSpecifier::FArg:
656 case ConversionSpecifier::eArg:
657 case ConversionSpecifier::EArg:
658 case ConversionSpecifier::gArg:
659 case ConversionSpecifier::GArg:
660 case ConversionSpecifier::nArg:
661 case ConversionSpecifier::cArg:
662 case ConversionSpecifier::sArg:
663 case ConversionSpecifier::FreeBSDrArg:
664 case ConversionSpecifier::ScanListArg:
665 return true;
666 default:
667 return false;
668 }
669
670 case LengthModifier::AsLongDouble:
671 switch (CS.getKind()) {
672 case ConversionSpecifier::aArg:
673 case ConversionSpecifier::AArg:
674 case ConversionSpecifier::fArg:
675 case ConversionSpecifier::FArg:
676 case ConversionSpecifier::eArg:
677 case ConversionSpecifier::EArg:
678 case ConversionSpecifier::gArg:
679 case ConversionSpecifier::GArg:
680 return true;
681 // GNU libc extension.
682 case ConversionSpecifier::dArg:
683 case ConversionSpecifier::iArg:
684 case ConversionSpecifier::oArg:
685 case ConversionSpecifier::uArg:
686 case ConversionSpecifier::xArg:
687 case ConversionSpecifier::XArg:
688 return !Target.getTriple().isOSDarwin() &&
689 !Target.getTriple().isOSWindows();
690 default:
691 return false;
692 }
693
694 case LengthModifier::AsAllocate:
695 switch (CS.getKind()) {
696 case ConversionSpecifier::sArg:
697 case ConversionSpecifier::SArg:
698 case ConversionSpecifier::ScanListArg:
699 return true;
700 default:
701 return false;
702 }
703
704 case LengthModifier::AsMAllocate:
705 switch (CS.getKind()) {
706 case ConversionSpecifier::cArg:
707 case ConversionSpecifier::CArg:
708 case ConversionSpecifier::sArg:
709 case ConversionSpecifier::SArg:
710 case ConversionSpecifier::ScanListArg:
711 return true;
712 default:
713 return false;
714 }
715 case LengthModifier::AsInt32:
716 case LengthModifier::AsInt3264:
717 case LengthModifier::AsInt64:
718 switch (CS.getKind()) {
719 case ConversionSpecifier::dArg:
720 case ConversionSpecifier::iArg:
721 case ConversionSpecifier::oArg:
722 case ConversionSpecifier::uArg:
723 case ConversionSpecifier::xArg:
724 case ConversionSpecifier::XArg:
725 return Target.getTriple().isOSMSVCRT();
726 default:
727 return false;
728 }
729 }
730 llvm_unreachable("Invalid LengthModifier Kind!");
731 }
732
hasStandardLengthModifier() const733 bool FormatSpecifier::hasStandardLengthModifier() const {
734 switch (LM.getKind()) {
735 case LengthModifier::None:
736 case LengthModifier::AsChar:
737 case LengthModifier::AsShort:
738 case LengthModifier::AsLong:
739 case LengthModifier::AsLongLong:
740 case LengthModifier::AsIntMax:
741 case LengthModifier::AsSizeT:
742 case LengthModifier::AsPtrDiff:
743 case LengthModifier::AsLongDouble:
744 return true;
745 case LengthModifier::AsAllocate:
746 case LengthModifier::AsMAllocate:
747 case LengthModifier::AsQuad:
748 case LengthModifier::AsInt32:
749 case LengthModifier::AsInt3264:
750 case LengthModifier::AsInt64:
751 return false;
752 }
753 llvm_unreachable("Invalid LengthModifier Kind!");
754 }
755
hasStandardConversionSpecifier(const LangOptions & LangOpt) const756 bool FormatSpecifier::hasStandardConversionSpecifier(const LangOptions &LangOpt) const {
757 switch (CS.getKind()) {
758 case ConversionSpecifier::cArg:
759 case ConversionSpecifier::dArg:
760 case ConversionSpecifier::iArg:
761 case ConversionSpecifier::oArg:
762 case ConversionSpecifier::uArg:
763 case ConversionSpecifier::xArg:
764 case ConversionSpecifier::XArg:
765 case ConversionSpecifier::fArg:
766 case ConversionSpecifier::FArg:
767 case ConversionSpecifier::eArg:
768 case ConversionSpecifier::EArg:
769 case ConversionSpecifier::gArg:
770 case ConversionSpecifier::GArg:
771 case ConversionSpecifier::aArg:
772 case ConversionSpecifier::AArg:
773 case ConversionSpecifier::sArg:
774 case ConversionSpecifier::pArg:
775 case ConversionSpecifier::nArg:
776 case ConversionSpecifier::ObjCObjArg:
777 case ConversionSpecifier::ScanListArg:
778 case ConversionSpecifier::PercentArg:
779 return true;
780 case ConversionSpecifier::CArg:
781 case ConversionSpecifier::SArg:
782 return LangOpt.ObjC1 || LangOpt.ObjC2;
783 case ConversionSpecifier::InvalidSpecifier:
784 case ConversionSpecifier::FreeBSDbArg:
785 case ConversionSpecifier::FreeBSDDArg:
786 case ConversionSpecifier::FreeBSDrArg:
787 case ConversionSpecifier::PrintErrno:
788 case ConversionSpecifier::DArg:
789 case ConversionSpecifier::OArg:
790 case ConversionSpecifier::UArg:
791 return false;
792 }
793 llvm_unreachable("Invalid ConversionSpecifier Kind!");
794 }
795
hasStandardLengthConversionCombination() const796 bool FormatSpecifier::hasStandardLengthConversionCombination() const {
797 if (LM.getKind() == LengthModifier::AsLongDouble) {
798 switch(CS.getKind()) {
799 case ConversionSpecifier::dArg:
800 case ConversionSpecifier::iArg:
801 case ConversionSpecifier::oArg:
802 case ConversionSpecifier::uArg:
803 case ConversionSpecifier::xArg:
804 case ConversionSpecifier::XArg:
805 return false;
806 default:
807 return true;
808 }
809 }
810 return true;
811 }
812
getCorrectedLengthModifier() const813 Optional<LengthModifier> FormatSpecifier::getCorrectedLengthModifier() const {
814 if (CS.isAnyIntArg() || CS.getKind() == ConversionSpecifier::nArg) {
815 if (LM.getKind() == LengthModifier::AsLongDouble ||
816 LM.getKind() == LengthModifier::AsQuad) {
817 LengthModifier FixedLM(LM);
818 FixedLM.setKind(LengthModifier::AsLongLong);
819 return FixedLM;
820 }
821 }
822
823 return None;
824 }
825
namedTypeToLengthModifier(QualType QT,LengthModifier & LM)826 bool FormatSpecifier::namedTypeToLengthModifier(QualType QT,
827 LengthModifier &LM) {
828 assert(isa<TypedefType>(QT) && "Expected a TypedefType");
829 const TypedefNameDecl *Typedef = cast<TypedefType>(QT)->getDecl();
830
831 for (;;) {
832 const IdentifierInfo *Identifier = Typedef->getIdentifier();
833 if (Identifier->getName() == "size_t") {
834 LM.setKind(LengthModifier::AsSizeT);
835 return true;
836 } else if (Identifier->getName() == "ssize_t") {
837 // Not C99, but common in Unix.
838 LM.setKind(LengthModifier::AsSizeT);
839 return true;
840 } else if (Identifier->getName() == "intmax_t") {
841 LM.setKind(LengthModifier::AsIntMax);
842 return true;
843 } else if (Identifier->getName() == "uintmax_t") {
844 LM.setKind(LengthModifier::AsIntMax);
845 return true;
846 } else if (Identifier->getName() == "ptrdiff_t") {
847 LM.setKind(LengthModifier::AsPtrDiff);
848 return true;
849 }
850
851 QualType T = Typedef->getUnderlyingType();
852 if (!isa<TypedefType>(T))
853 break;
854
855 Typedef = cast<TypedefType>(T)->getDecl();
856 }
857 return false;
858 }
859