PrintfFormatString.cpp revision 243830 
1//== PrintfFormatString.cpp - Analysis of printf format strings --*- 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// Handling of format string in printf and friends.  The structure of format
11// strings for fprintf() are described in C99 7.19.6.1.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/Analysis/Analyses/FormatString.h"
16#include "clang/Basic/TargetInfo.h"
17#include "FormatStringParsing.h"
18
19using clang::analyze_format_string::ArgType;
20using clang::analyze_format_string::FormatStringHandler;
21using clang::analyze_format_string::LengthModifier;
22using clang::analyze_format_string::OptionalAmount;
23using clang::analyze_format_string::ConversionSpecifier;
24using clang::analyze_printf::PrintfSpecifier;
25
26using namespace clang;
27
28typedef clang::analyze_format_string::SpecifierResult<PrintfSpecifier>
29        PrintfSpecifierResult;
30
31//===----------------------------------------------------------------------===//
32// Methods for parsing format strings.
33//===----------------------------------------------------------------------===//
34
35using analyze_format_string::ParseNonPositionAmount;
36
37static bool ParsePrecision(FormatStringHandler &H, PrintfSpecifier &FS,
38                           const char *Start, const char *&Beg, const char *E,
39                           unsigned *argIndex) {
40  if (argIndex) {
41    FS.setPrecision(ParseNonPositionAmount(Beg, E, *argIndex));
42  } else {
43    const OptionalAmount Amt = ParsePositionAmount(H, Start, Beg, E,
44                                           analyze_format_string::PrecisionPos);
45    if (Amt.isInvalid())
46      return true;
47    FS.setPrecision(Amt);
48  }
49  return false;
50}
51
52static PrintfSpecifierResult ParsePrintfSpecifier(FormatStringHandler &H,
53                                                  const char *&Beg,
54                                                  const char *E,
55                                                  unsigned &argIndex,
56                                                  const LangOptions &LO,
57                                                  const TargetInfo &Target) {
58
59  using namespace clang::analyze_format_string;
60  using namespace clang::analyze_printf;
61
62  const char *I = Beg;
63  const char *Start = 0;
64  UpdateOnReturn <const char*> UpdateBeg(Beg, I);
65
66  // Look for a '%' character that indicates the start of a format specifier.
67  for ( ; I != E ; ++I) {
68    char c = *I;
69    if (c == '\0') {
70      // Detect spurious null characters, which are likely errors.
71      H.HandleNullChar(I);
72      return true;
73    }
74    if (c == '%') {
75      Start = I++;  // Record the start of the format specifier.
76      break;
77    }
78  }
79
80  // No format specifier found?
81  if (!Start)
82    return false;
83
84  if (I == E) {
85    // No more characters left?
86    H.HandleIncompleteSpecifier(Start, E - Start);
87    return true;
88  }
89
90  PrintfSpecifier FS;
91  if (ParseArgPosition(H, FS, Start, I, E))
92    return true;
93
94  if (I == E) {
95    // No more characters left?
96    H.HandleIncompleteSpecifier(Start, E - Start);
97    return true;
98  }
99
100  // Look for flags (if any).
101  bool hasMore = true;
102  for ( ; I != E; ++I) {
103    switch (*I) {
104      default: hasMore = false; break;
105      case '\'':
106        // FIXME: POSIX specific.  Always accept?
107        FS.setHasThousandsGrouping(I);
108        break;
109      case '-': FS.setIsLeftJustified(I); break;
110      case '+': FS.setHasPlusPrefix(I); break;
111      case ' ': FS.setHasSpacePrefix(I); break;
112      case '#': FS.setHasAlternativeForm(I); break;
113      case '0': FS.setHasLeadingZeros(I); break;
114    }
115    if (!hasMore)
116      break;
117  }
118
119  if (I == E) {
120    // No more characters left?
121    H.HandleIncompleteSpecifier(Start, E - Start);
122    return true;
123  }
124
125  // Look for the field width (if any).
126  if (ParseFieldWidth(H, FS, Start, I, E,
127                      FS.usesPositionalArg() ? 0 : &argIndex))
128    return true;
129
130  if (I == E) {
131    // No more characters left?
132    H.HandleIncompleteSpecifier(Start, E - Start);
133    return true;
134  }
135
136  // Look for the precision (if any).
137  if (*I == '.') {
138    ++I;
139    if (I == E) {
140      H.HandleIncompleteSpecifier(Start, E - Start);
141      return true;
142    }
143
144    if (ParsePrecision(H, FS, Start, I, E,
145                       FS.usesPositionalArg() ? 0 : &argIndex))
146      return true;
147
148    if (I == E) {
149      // No more characters left?
150      H.HandleIncompleteSpecifier(Start, E - Start);
151      return true;
152    }
153  }
154
155  // Look for the length modifier.
156  if (ParseLengthModifier(FS, I, E, LO) && I == E) {
157    // No more characters left?
158    H.HandleIncompleteSpecifier(Start, E - Start);
159    return true;
160  }
161
162  if (*I == '\0') {
163    // Detect spurious null characters, which are likely errors.
164    H.HandleNullChar(I);
165    return true;
166  }
167
168  // Finally, look for the conversion specifier.
169  const char *conversionPosition = I++;
170  ConversionSpecifier::Kind k = ConversionSpecifier::InvalidSpecifier;
171  switch (*conversionPosition) {
172    default:
173      break;
174    // C99: 7.19.6.1 (section 8).
175    case '%': k = ConversionSpecifier::PercentArg;   break;
176    case 'A': k = ConversionSpecifier::AArg; break;
177    case 'E': k = ConversionSpecifier::EArg; break;
178    case 'F': k = ConversionSpecifier::FArg; break;
179    case 'G': k = ConversionSpecifier::GArg; break;
180    case 'X': k = ConversionSpecifier::XArg; break;
181    case 'a': k = ConversionSpecifier::aArg; break;
182    case 'c': k = ConversionSpecifier::cArg; break;
183    case 'd': k = ConversionSpecifier::dArg; break;
184    case 'e': k = ConversionSpecifier::eArg; break;
185    case 'f': k = ConversionSpecifier::fArg; break;
186    case 'g': k = ConversionSpecifier::gArg; break;
187    case 'i': k = ConversionSpecifier::iArg; break;
188    case 'n': k = ConversionSpecifier::nArg; break;
189    case 'o': k = ConversionSpecifier::oArg; break;
190    case 'p': k = ConversionSpecifier::pArg;   break;
191    case 's': k = ConversionSpecifier::sArg;      break;
192    case 'u': k = ConversionSpecifier::uArg; break;
193    case 'x': k = ConversionSpecifier::xArg; break;
194    // POSIX specific.
195    case 'C': k = ConversionSpecifier::CArg; break;
196    case 'S': k = ConversionSpecifier::SArg; break;
197    // Objective-C.
198    case '@': k = ConversionSpecifier::ObjCObjArg; break;
199    // Glibc specific.
200    case 'm': k = ConversionSpecifier::PrintErrno; break;
201    // FreeBSD format extensions
202    case 'b':
203      if (LO.FormatExtensions)
204        k = ConversionSpecifier::FreeBSDbArg; // int followed by char *
205      break;
206    case 'r':
207      if (LO.FormatExtensions)
208        k = ConversionSpecifier::FreeBSDrArg;
209      break;
210    case 'y':
211      if (LO.FormatExtensions)
212        k = ConversionSpecifier::iArg;
213      break;
214    // Apple-specific
215    case 'D':
216      if (Target.getTriple().isOSDarwin())
217        k = ConversionSpecifier::DArg;
218      else if (LO.FormatExtensions)
219        k = ConversionSpecifier::FreeBSDDArg; // u_char * followed by char *
220      break;
221    case 'O':
222      if (Target.getTriple().isOSDarwin())
223        k = ConversionSpecifier::OArg;
224      break;
225    case 'U':
226      if (Target.getTriple().isOSDarwin())
227        k = ConversionSpecifier::UArg;
228      break;
229  }
230  PrintfConversionSpecifier CS(conversionPosition, k);
231  FS.setConversionSpecifier(CS);
232  if (CS.consumesDataArgument() && !FS.usesPositionalArg())
233    FS.setArgIndex(argIndex++);
234  // FreeBSD extension
235  if (k == ConversionSpecifier::FreeBSDbArg ||
236      k == ConversionSpecifier::FreeBSDDArg)
237    argIndex++;
238
239  if (k == ConversionSpecifier::InvalidSpecifier) {
240    // Assume the conversion takes one argument.
241    return !H.HandleInvalidPrintfConversionSpecifier(FS, Start, I - Start);
242  }
243  return PrintfSpecifierResult(Start, FS);
244}
245
246bool clang::analyze_format_string::ParsePrintfString(FormatStringHandler &H,
247                                                     const char *I,
248                                                     const char *E,
249                                                     const LangOptions &LO,
250                                                     const TargetInfo &Target) {
251
252  unsigned argIndex = 0;
253
254  // Keep looking for a format specifier until we have exhausted the string.
255  while (I != E) {
256    const PrintfSpecifierResult &FSR = ParsePrintfSpecifier(H, I, E, argIndex,
257                                                            LO, Target);
258    // Did a fail-stop error of any kind occur when parsing the specifier?
259    // If so, don't do any more processing.
260    if (FSR.shouldStop())
261      return true;
262    // Did we exhaust the string or encounter an error that
263    // we can recover from?
264    if (!FSR.hasValue())
265      continue;
266    // We have a format specifier.  Pass it to the callback.
267    if (!H.HandlePrintfSpecifier(FSR.getValue(), FSR.getStart(),
268                                 I - FSR.getStart()))
269      return true;
270  }
271  assert(I == E && "Format string not exhausted");
272  return false;
273}
274
275//===----------------------------------------------------------------------===//
276// Methods on PrintfSpecifier.
277//===----------------------------------------------------------------------===//
278
279ArgType PrintfSpecifier::getArgType(ASTContext &Ctx,
280                                    bool IsObjCLiteral) const {
281  const PrintfConversionSpecifier &CS = getConversionSpecifier();
282
283  if (!CS.consumesDataArgument())
284    return ArgType::Invalid();
285
286  if (CS.getKind() == ConversionSpecifier::cArg)
287    switch (LM.getKind()) {
288      case LengthModifier::None: return Ctx.IntTy;
289      case LengthModifier::AsLong:
290        return ArgType(ArgType::WIntTy, "wint_t");
291      default:
292        return ArgType::Invalid();
293    }
294
295  if (CS.isIntArg())
296    switch (LM.getKind()) {
297      case LengthModifier::AsLongDouble:
298        // GNU extension.
299        return Ctx.LongLongTy;
300      case LengthModifier::None: return Ctx.IntTy;
301      case LengthModifier::AsChar: return ArgType::AnyCharTy;
302      case LengthModifier::AsShort: return Ctx.ShortTy;
303      case LengthModifier::AsLong: return Ctx.LongTy;
304      case LengthModifier::AsLongLong:
305      case LengthModifier::AsQuad:
306        return Ctx.LongLongTy;
307      case LengthModifier::AsIntMax:
308        return ArgType(Ctx.getIntMaxType(), "intmax_t");
309      case LengthModifier::AsSizeT:
310        // FIXME: How to get the corresponding signed version of size_t?
311        return ArgType();
312      case LengthModifier::AsPtrDiff:
313        return ArgType(Ctx.getPointerDiffType(), "ptrdiff_t");
314      case LengthModifier::AsAllocate:
315      case LengthModifier::AsMAllocate:
316        return ArgType::Invalid();
317    }
318
319  if (CS.isUIntArg())
320    switch (LM.getKind()) {
321      case LengthModifier::AsLongDouble:
322        // GNU extension.
323        return Ctx.UnsignedLongLongTy;
324      case LengthModifier::None: return Ctx.UnsignedIntTy;
325      case LengthModifier::AsChar: return Ctx.UnsignedCharTy;
326      case LengthModifier::AsShort: return Ctx.UnsignedShortTy;
327      case LengthModifier::AsLong: return Ctx.UnsignedLongTy;
328      case LengthModifier::AsLongLong:
329      case LengthModifier::AsQuad:
330        return Ctx.UnsignedLongLongTy;
331      case LengthModifier::AsIntMax:
332        return ArgType(Ctx.getUIntMaxType(), "uintmax_t");
333      case LengthModifier::AsSizeT:
334        return ArgType(Ctx.getSizeType(), "size_t");
335      case LengthModifier::AsPtrDiff:
336        // FIXME: How to get the corresponding unsigned
337        // version of ptrdiff_t?
338        return ArgType();
339      case LengthModifier::AsAllocate:
340      case LengthModifier::AsMAllocate:
341        return ArgType::Invalid();
342    }
343
344  if (CS.isDoubleArg()) {
345    if (LM.getKind() == LengthModifier::AsLongDouble)
346      return Ctx.LongDoubleTy;
347    return Ctx.DoubleTy;
348  }
349
350  if (CS.getKind() == ConversionSpecifier::nArg) {
351    switch (LM.getKind()) {
352      case LengthModifier::None:
353        return ArgType::PtrTo(Ctx.IntTy);
354      case LengthModifier::AsChar:
355        return ArgType::PtrTo(Ctx.SignedCharTy);
356      case LengthModifier::AsShort:
357        return ArgType::PtrTo(Ctx.ShortTy);
358      case LengthModifier::AsLong:
359        return ArgType::PtrTo(Ctx.LongTy);
360      case LengthModifier::AsLongLong:
361      case LengthModifier::AsQuad:
362        return ArgType::PtrTo(Ctx.LongLongTy);
363      case LengthModifier::AsIntMax:
364        return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t"));
365      case LengthModifier::AsSizeT:
366        return ArgType(); // FIXME: ssize_t
367      case LengthModifier::AsPtrDiff:
368        return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"));
369      case LengthModifier::AsLongDouble:
370        return ArgType(); // FIXME: Is this a known extension?
371      case LengthModifier::AsAllocate:
372      case LengthModifier::AsMAllocate:
373        return ArgType::Invalid();
374    }
375  }
376
377  switch (CS.getKind()) {
378    case ConversionSpecifier::sArg:
379      if (LM.getKind() == LengthModifier::AsWideChar) {
380        if (IsObjCLiteral)
381          return Ctx.getPointerType(Ctx.UnsignedShortTy.withConst());
382        return ArgType(ArgType::WCStrTy, "wchar_t *");
383      }
384      return ArgType::CStrTy;
385    case ConversionSpecifier::SArg:
386      if (IsObjCLiteral)
387        return Ctx.getPointerType(Ctx.UnsignedShortTy.withConst());
388      return ArgType(ArgType::WCStrTy, "wchar_t *");
389    case ConversionSpecifier::CArg:
390      if (IsObjCLiteral)
391        return Ctx.UnsignedShortTy;
392      return ArgType(Ctx.WCharTy, "wchar_t");
393    case ConversionSpecifier::pArg:
394      return ArgType::CPointerTy;
395    case ConversionSpecifier::ObjCObjArg:
396      return ArgType::ObjCPointerTy;
397    default:
398      break;
399  }
400
401  // FIXME: Handle other cases.
402  return ArgType();
403}
404
405bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt,
406                              ASTContext &Ctx, bool IsObjCLiteral) {
407  // %n is different from other conversion specifiers; don't try to fix it.
408  if (CS.getKind() == ConversionSpecifier::nArg)
409    return false;
410
411  // Handle Objective-C objects first. Note that while the '%@' specifier will
412  // not warn for structure pointer or void pointer arguments (because that's
413  // how CoreFoundation objects are implemented), we only show a fixit for '%@'
414  // if we know it's an object (block, id, class, or __attribute__((NSObject))).
415  if (QT->isObjCRetainableType()) {
416    if (!IsObjCLiteral)
417      return false;
418
419    CS.setKind(ConversionSpecifier::ObjCObjArg);
420
421    // Disable irrelevant flags
422    HasThousandsGrouping = false;
423    HasPlusPrefix = false;
424    HasSpacePrefix = false;
425    HasAlternativeForm = false;
426    HasLeadingZeroes = false;
427    Precision.setHowSpecified(OptionalAmount::NotSpecified);
428    LM.setKind(LengthModifier::None);
429
430    return true;
431  }
432
433  // Handle strings next (char *, wchar_t *)
434  if (QT->isPointerType() && (QT->getPointeeType()->isAnyCharacterType())) {
435    CS.setKind(ConversionSpecifier::sArg);
436
437    // Disable irrelevant flags
438    HasAlternativeForm = 0;
439    HasLeadingZeroes = 0;
440
441    // Set the long length modifier for wide characters
442    if (QT->getPointeeType()->isWideCharType())
443      LM.setKind(LengthModifier::AsWideChar);
444    else
445      LM.setKind(LengthModifier::None);
446
447    return true;
448  }
449
450  // If it's an enum, get its underlying type.
451  if (const EnumType *ETy = QT->getAs<EnumType>())
452    QT = ETy->getDecl()->getIntegerType();
453
454  // We can only work with builtin types.
455  const BuiltinType *BT = QT->getAs<BuiltinType>();
456  if (!BT)
457    return false;
458
459  // Set length modifier
460  switch (BT->getKind()) {
461  case BuiltinType::Bool:
462  case BuiltinType::WChar_U:
463  case BuiltinType::WChar_S:
464  case BuiltinType::Char16:
465  case BuiltinType::Char32:
466  case BuiltinType::UInt128:
467  case BuiltinType::Int128:
468  case BuiltinType::Half:
469    // Various types which are non-trivial to correct.
470    return false;
471
472#define SIGNED_TYPE(Id, SingletonId)
473#define UNSIGNED_TYPE(Id, SingletonId)
474#define FLOATING_TYPE(Id, SingletonId)
475#define BUILTIN_TYPE(Id, SingletonId) \
476  case BuiltinType::Id:
477#include "clang/AST/BuiltinTypes.def"
478    // Misc other stuff which doesn't make sense here.
479    return false;
480
481  case BuiltinType::UInt:
482  case BuiltinType::Int:
483  case BuiltinType::Float:
484  case BuiltinType::Double:
485    LM.setKind(LengthModifier::None);
486    break;
487
488  case BuiltinType::Char_U:
489  case BuiltinType::UChar:
490  case BuiltinType::Char_S:
491  case BuiltinType::SChar:
492    LM.setKind(LengthModifier::AsChar);
493    break;
494
495  case BuiltinType::Short:
496  case BuiltinType::UShort:
497    LM.setKind(LengthModifier::AsShort);
498    break;
499
500  case BuiltinType::Long:
501  case BuiltinType::ULong:
502    LM.setKind(LengthModifier::AsLong);
503    break;
504
505  case BuiltinType::LongLong:
506  case BuiltinType::ULongLong:
507    LM.setKind(LengthModifier::AsLongLong);
508    break;
509
510  case BuiltinType::LongDouble:
511    LM.setKind(LengthModifier::AsLongDouble);
512    break;
513  }
514
515  // Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99.
516  if (isa<TypedefType>(QT) && (LangOpt.C99 || LangOpt.CPlusPlus0x))
517    namedTypeToLengthModifier(QT, LM);
518
519  // If fixing the length modifier was enough, we are done.
520  if (hasValidLengthModifier(Ctx.getTargetInfo())) {
521    const analyze_printf::ArgType &ATR = getArgType(Ctx, IsObjCLiteral);
522    if (ATR.isValid() && ATR.matchesType(Ctx, QT))
523      return true;
524  }
525
526  // Set conversion specifier and disable any flags which do not apply to it.
527  // Let typedefs to char fall through to int, as %c is silly for uint8_t.
528  if (isa<TypedefType>(QT) && QT->isAnyCharacterType()) {
529    CS.setKind(ConversionSpecifier::cArg);
530    LM.setKind(LengthModifier::None);
531    Precision.setHowSpecified(OptionalAmount::NotSpecified);
532    HasAlternativeForm = 0;
533    HasLeadingZeroes = 0;
534    HasPlusPrefix = 0;
535  }
536  // Test for Floating type first as LongDouble can pass isUnsignedIntegerType
537  else if (QT->isRealFloatingType()) {
538    CS.setKind(ConversionSpecifier::fArg);
539  }
540  else if (QT->isSignedIntegerType()) {
541    CS.setKind(ConversionSpecifier::dArg);
542    HasAlternativeForm = 0;
543  }
544  else if (QT->isUnsignedIntegerType()) {
545    CS.setKind(ConversionSpecifier::uArg);
546    HasAlternativeForm = 0;
547    HasPlusPrefix = 0;
548  } else {
549    llvm_unreachable("Unexpected type");
550  }
551
552  return true;
553}
554
555void PrintfSpecifier::toString(raw_ostream &os) const {
556  // Whilst some features have no defined order, we are using the order
557  // appearing in the C99 standard (ISO/IEC 9899:1999 (E) 7.19.6.1)
558  os << "%";
559
560  // Positional args
561  if (usesPositionalArg()) {
562    os << getPositionalArgIndex() << "$";
563  }
564
565  // Conversion flags
566  if (IsLeftJustified)    os << "-";
567  if (HasPlusPrefix)      os << "+";
568  if (HasSpacePrefix)     os << " ";
569  if (HasAlternativeForm) os << "#";
570  if (HasLeadingZeroes)   os << "0";
571
572  // Minimum field width
573  FieldWidth.toString(os);
574  // Precision
575  Precision.toString(os);
576  // Length modifier
577  os << LM.toString();
578  // Conversion specifier
579  os << CS.toString();
580}
581
582bool PrintfSpecifier::hasValidPlusPrefix() const {
583  if (!HasPlusPrefix)
584    return true;
585
586  // The plus prefix only makes sense for signed conversions
587  switch (CS.getKind()) {
588  case ConversionSpecifier::dArg:
589  case ConversionSpecifier::DArg:
590  case ConversionSpecifier::iArg:
591  case ConversionSpecifier::fArg:
592  case ConversionSpecifier::FArg:
593  case ConversionSpecifier::eArg:
594  case ConversionSpecifier::EArg:
595  case ConversionSpecifier::gArg:
596  case ConversionSpecifier::GArg:
597  case ConversionSpecifier::aArg:
598  case ConversionSpecifier::AArg:
599  case ConversionSpecifier::FreeBSDrArg:
600    return true;
601
602  default:
603    return false;
604  }
605}
606
607bool PrintfSpecifier::hasValidAlternativeForm() const {
608  if (!HasAlternativeForm)
609    return true;
610
611  // Alternate form flag only valid with the oxXaAeEfFgG conversions
612  switch (CS.getKind()) {
613  case ConversionSpecifier::oArg:
614  case ConversionSpecifier::OArg:
615  case ConversionSpecifier::xArg:
616  case ConversionSpecifier::XArg:
617  case ConversionSpecifier::aArg:
618  case ConversionSpecifier::AArg:
619  case ConversionSpecifier::eArg:
620  case ConversionSpecifier::EArg:
621  case ConversionSpecifier::fArg:
622  case ConversionSpecifier::FArg:
623  case ConversionSpecifier::gArg:
624  case ConversionSpecifier::GArg:
625  case ConversionSpecifier::FreeBSDrArg:
626    return true;
627
628  default:
629    return false;
630  }
631}
632
633bool PrintfSpecifier::hasValidLeadingZeros() const {
634  if (!HasLeadingZeroes)
635    return true;
636
637  // Leading zeroes flag only valid with the diouxXaAeEfFgG conversions
638  switch (CS.getKind()) {
639  case ConversionSpecifier::dArg:
640  case ConversionSpecifier::DArg:
641  case ConversionSpecifier::iArg:
642  case ConversionSpecifier::oArg:
643  case ConversionSpecifier::OArg:
644  case ConversionSpecifier::uArg:
645  case ConversionSpecifier::UArg:
646  case ConversionSpecifier::xArg:
647  case ConversionSpecifier::XArg:
648  case ConversionSpecifier::aArg:
649  case ConversionSpecifier::AArg:
650  case ConversionSpecifier::eArg:
651  case ConversionSpecifier::EArg:
652  case ConversionSpecifier::fArg:
653  case ConversionSpecifier::FArg:
654  case ConversionSpecifier::gArg:
655  case ConversionSpecifier::GArg:
656    return true;
657
658  default:
659    return false;
660  }
661}
662
663bool PrintfSpecifier::hasValidSpacePrefix() const {
664  if (!HasSpacePrefix)
665    return true;
666
667  // The space prefix only makes sense for signed conversions
668  switch (CS.getKind()) {
669  case ConversionSpecifier::dArg:
670  case ConversionSpecifier::DArg:
671  case ConversionSpecifier::iArg:
672  case ConversionSpecifier::fArg:
673  case ConversionSpecifier::FArg:
674  case ConversionSpecifier::eArg:
675  case ConversionSpecifier::EArg:
676  case ConversionSpecifier::gArg:
677  case ConversionSpecifier::GArg:
678  case ConversionSpecifier::aArg:
679  case ConversionSpecifier::AArg:
680    return true;
681
682  default:
683    return false;
684  }
685}
686
687bool PrintfSpecifier::hasValidLeftJustified() const {
688  if (!IsLeftJustified)
689    return true;
690
691  // The left justified flag is valid for all conversions except n
692  switch (CS.getKind()) {
693  case ConversionSpecifier::nArg:
694    return false;
695
696  default:
697    return true;
698  }
699}
700
701bool PrintfSpecifier::hasValidThousandsGroupingPrefix() const {
702  if (!HasThousandsGrouping)
703    return true;
704
705  switch (CS.getKind()) {
706    case ConversionSpecifier::dArg:
707    case ConversionSpecifier::DArg:
708    case ConversionSpecifier::iArg:
709    case ConversionSpecifier::uArg:
710    case ConversionSpecifier::UArg:
711    case ConversionSpecifier::fArg:
712    case ConversionSpecifier::FArg:
713    case ConversionSpecifier::gArg:
714    case ConversionSpecifier::GArg:
715      return true;
716    default:
717      return false;
718  }
719}
720
721bool PrintfSpecifier::hasValidPrecision() const {
722  if (Precision.getHowSpecified() == OptionalAmount::NotSpecified)
723    return true;
724
725  // Precision is only valid with the diouxXaAeEfFgGs conversions
726  switch (CS.getKind()) {
727  case ConversionSpecifier::dArg:
728  case ConversionSpecifier::DArg:
729  case ConversionSpecifier::iArg:
730  case ConversionSpecifier::oArg:
731  case ConversionSpecifier::OArg:
732  case ConversionSpecifier::uArg:
733  case ConversionSpecifier::UArg:
734  case ConversionSpecifier::xArg:
735  case ConversionSpecifier::XArg:
736  case ConversionSpecifier::aArg:
737  case ConversionSpecifier::AArg:
738  case ConversionSpecifier::eArg:
739  case ConversionSpecifier::EArg:
740  case ConversionSpecifier::fArg:
741  case ConversionSpecifier::FArg:
742  case ConversionSpecifier::gArg:
743  case ConversionSpecifier::GArg:
744  case ConversionSpecifier::sArg:
745    return true;
746
747  default:
748    return false;
749  }
750}
751bool PrintfSpecifier::hasValidFieldWidth() const {
752  if (FieldWidth.getHowSpecified() == OptionalAmount::NotSpecified)
753      return true;
754
755  // The field width is valid for all conversions except n
756  switch (CS.getKind()) {
757  case ConversionSpecifier::nArg:
758    return false;
759
760  default:
761    return true;
762  }
763}
764