PrintfFormatString.cpp revision 276479
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 "FormatStringParsing.h" 17#include "clang/Basic/TargetInfo.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 = nullptr; 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() ? nullptr : &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() ? nullptr : &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: 301 return Ctx.IntTy; 302 case LengthModifier::AsInt32: 303 return ArgType(Ctx.IntTy, "__int32"); 304 case LengthModifier::AsChar: return ArgType::AnyCharTy; 305 case LengthModifier::AsShort: return Ctx.ShortTy; 306 case LengthModifier::AsLong: return Ctx.LongTy; 307 case LengthModifier::AsLongLong: 308 case LengthModifier::AsQuad: 309 return Ctx.LongLongTy; 310 case LengthModifier::AsInt64: 311 return ArgType(Ctx.LongLongTy, "__int64"); 312 case LengthModifier::AsIntMax: 313 return ArgType(Ctx.getIntMaxType(), "intmax_t"); 314 case LengthModifier::AsSizeT: 315 // FIXME: How to get the corresponding signed version of size_t? 316 return ArgType(); 317 case LengthModifier::AsInt3264: 318 return Ctx.getTargetInfo().getTriple().isArch64Bit() 319 ? ArgType(Ctx.LongLongTy, "__int64") 320 : ArgType(Ctx.IntTy, "__int32"); 321 case LengthModifier::AsPtrDiff: 322 return ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"); 323 case LengthModifier::AsAllocate: 324 case LengthModifier::AsMAllocate: 325 return ArgType::Invalid(); 326 } 327 328 if (CS.isUIntArg()) 329 switch (LM.getKind()) { 330 case LengthModifier::AsLongDouble: 331 // GNU extension. 332 return Ctx.UnsignedLongLongTy; 333 case LengthModifier::None: 334 return Ctx.UnsignedIntTy; 335 case LengthModifier::AsInt32: 336 return ArgType(Ctx.UnsignedIntTy, "unsigned __int32"); 337 case LengthModifier::AsChar: return Ctx.UnsignedCharTy; 338 case LengthModifier::AsShort: return Ctx.UnsignedShortTy; 339 case LengthModifier::AsLong: return Ctx.UnsignedLongTy; 340 case LengthModifier::AsLongLong: 341 case LengthModifier::AsQuad: 342 return Ctx.UnsignedLongLongTy; 343 case LengthModifier::AsInt64: 344 return ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64"); 345 case LengthModifier::AsIntMax: 346 return ArgType(Ctx.getUIntMaxType(), "uintmax_t"); 347 case LengthModifier::AsSizeT: 348 return ArgType(Ctx.getSizeType(), "size_t"); 349 case LengthModifier::AsInt3264: 350 return Ctx.getTargetInfo().getTriple().isArch64Bit() 351 ? ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64") 352 : ArgType(Ctx.UnsignedIntTy, "unsigned __int32"); 353 case LengthModifier::AsPtrDiff: 354 // FIXME: How to get the corresponding unsigned 355 // version of ptrdiff_t? 356 return ArgType(); 357 case LengthModifier::AsAllocate: 358 case LengthModifier::AsMAllocate: 359 return ArgType::Invalid(); 360 } 361 362 if (CS.isDoubleArg()) { 363 if (LM.getKind() == LengthModifier::AsLongDouble) 364 return Ctx.LongDoubleTy; 365 return Ctx.DoubleTy; 366 } 367 368 if (CS.getKind() == ConversionSpecifier::nArg) { 369 switch (LM.getKind()) { 370 case LengthModifier::None: 371 return ArgType::PtrTo(Ctx.IntTy); 372 case LengthModifier::AsChar: 373 return ArgType::PtrTo(Ctx.SignedCharTy); 374 case LengthModifier::AsShort: 375 return ArgType::PtrTo(Ctx.ShortTy); 376 case LengthModifier::AsLong: 377 return ArgType::PtrTo(Ctx.LongTy); 378 case LengthModifier::AsLongLong: 379 case LengthModifier::AsQuad: 380 return ArgType::PtrTo(Ctx.LongLongTy); 381 case LengthModifier::AsIntMax: 382 return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t")); 383 case LengthModifier::AsSizeT: 384 return ArgType(); // FIXME: ssize_t 385 case LengthModifier::AsPtrDiff: 386 return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t")); 387 case LengthModifier::AsLongDouble: 388 return ArgType(); // FIXME: Is this a known extension? 389 case LengthModifier::AsAllocate: 390 case LengthModifier::AsMAllocate: 391 case LengthModifier::AsInt32: 392 case LengthModifier::AsInt3264: 393 case LengthModifier::AsInt64: 394 return ArgType::Invalid(); 395 } 396 } 397 398 switch (CS.getKind()) { 399 case ConversionSpecifier::sArg: 400 if (LM.getKind() == LengthModifier::AsWideChar) { 401 if (IsObjCLiteral) 402 return ArgType(Ctx.getPointerType(Ctx.UnsignedShortTy.withConst()), 403 "const unichar *"); 404 return ArgType(ArgType::WCStrTy, "wchar_t *"); 405 } 406 return ArgType::CStrTy; 407 case ConversionSpecifier::SArg: 408 if (IsObjCLiteral) 409 return ArgType(Ctx.getPointerType(Ctx.UnsignedShortTy.withConst()), 410 "const unichar *"); 411 return ArgType(ArgType::WCStrTy, "wchar_t *"); 412 case ConversionSpecifier::CArg: 413 if (IsObjCLiteral) 414 return ArgType(Ctx.UnsignedShortTy, "unichar"); 415 return ArgType(Ctx.WideCharTy, "wchar_t"); 416 case ConversionSpecifier::pArg: 417 return ArgType::CPointerTy; 418 case ConversionSpecifier::ObjCObjArg: 419 return ArgType::ObjCPointerTy; 420 default: 421 break; 422 } 423 424 // FIXME: Handle other cases. 425 return ArgType(); 426} 427 428bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt, 429 ASTContext &Ctx, bool IsObjCLiteral) { 430 // %n is different from other conversion specifiers; don't try to fix it. 431 if (CS.getKind() == ConversionSpecifier::nArg) 432 return false; 433 434 // Handle Objective-C objects first. Note that while the '%@' specifier will 435 // not warn for structure pointer or void pointer arguments (because that's 436 // how CoreFoundation objects are implemented), we only show a fixit for '%@' 437 // if we know it's an object (block, id, class, or __attribute__((NSObject))). 438 if (QT->isObjCRetainableType()) { 439 if (!IsObjCLiteral) 440 return false; 441 442 CS.setKind(ConversionSpecifier::ObjCObjArg); 443 444 // Disable irrelevant flags 445 HasThousandsGrouping = false; 446 HasPlusPrefix = false; 447 HasSpacePrefix = false; 448 HasAlternativeForm = false; 449 HasLeadingZeroes = false; 450 Precision.setHowSpecified(OptionalAmount::NotSpecified); 451 LM.setKind(LengthModifier::None); 452 453 return true; 454 } 455 456 // Handle strings next (char *, wchar_t *) 457 if (QT->isPointerType() && (QT->getPointeeType()->isAnyCharacterType())) { 458 CS.setKind(ConversionSpecifier::sArg); 459 460 // Disable irrelevant flags 461 HasAlternativeForm = 0; 462 HasLeadingZeroes = 0; 463 464 // Set the long length modifier for wide characters 465 if (QT->getPointeeType()->isWideCharType()) 466 LM.setKind(LengthModifier::AsWideChar); 467 else 468 LM.setKind(LengthModifier::None); 469 470 return true; 471 } 472 473 // If it's an enum, get its underlying type. 474 if (const EnumType *ETy = QT->getAs<EnumType>()) 475 QT = ETy->getDecl()->getIntegerType(); 476 477 // We can only work with builtin types. 478 const BuiltinType *BT = QT->getAs<BuiltinType>(); 479 if (!BT) 480 return false; 481 482 // Set length modifier 483 switch (BT->getKind()) { 484 case BuiltinType::Bool: 485 case BuiltinType::WChar_U: 486 case BuiltinType::WChar_S: 487 case BuiltinType::Char16: 488 case BuiltinType::Char32: 489 case BuiltinType::UInt128: 490 case BuiltinType::Int128: 491 case BuiltinType::Half: 492 // Various types which are non-trivial to correct. 493 return false; 494 495#define SIGNED_TYPE(Id, SingletonId) 496#define UNSIGNED_TYPE(Id, SingletonId) 497#define FLOATING_TYPE(Id, SingletonId) 498#define BUILTIN_TYPE(Id, SingletonId) \ 499 case BuiltinType::Id: 500#include "clang/AST/BuiltinTypes.def" 501 // Misc other stuff which doesn't make sense here. 502 return false; 503 504 case BuiltinType::UInt: 505 case BuiltinType::Int: 506 case BuiltinType::Float: 507 case BuiltinType::Double: 508 LM.setKind(LengthModifier::None); 509 break; 510 511 case BuiltinType::Char_U: 512 case BuiltinType::UChar: 513 case BuiltinType::Char_S: 514 case BuiltinType::SChar: 515 LM.setKind(LengthModifier::AsChar); 516 break; 517 518 case BuiltinType::Short: 519 case BuiltinType::UShort: 520 LM.setKind(LengthModifier::AsShort); 521 break; 522 523 case BuiltinType::Long: 524 case BuiltinType::ULong: 525 LM.setKind(LengthModifier::AsLong); 526 break; 527 528 case BuiltinType::LongLong: 529 case BuiltinType::ULongLong: 530 LM.setKind(LengthModifier::AsLongLong); 531 break; 532 533 case BuiltinType::LongDouble: 534 LM.setKind(LengthModifier::AsLongDouble); 535 break; 536 } 537 538 // Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99. 539 if (isa<TypedefType>(QT) && (LangOpt.C99 || LangOpt.CPlusPlus11)) 540 namedTypeToLengthModifier(QT, LM); 541 542 // If fixing the length modifier was enough, we might be done. 543 if (hasValidLengthModifier(Ctx.getTargetInfo())) { 544 // If we're going to offer a fix anyway, make sure the sign matches. 545 switch (CS.getKind()) { 546 case ConversionSpecifier::uArg: 547 case ConversionSpecifier::UArg: 548 if (QT->isSignedIntegerType()) 549 CS.setKind(clang::analyze_format_string::ConversionSpecifier::dArg); 550 break; 551 case ConversionSpecifier::dArg: 552 case ConversionSpecifier::DArg: 553 case ConversionSpecifier::iArg: 554 if (QT->isUnsignedIntegerType() && !HasPlusPrefix) 555 CS.setKind(clang::analyze_format_string::ConversionSpecifier::uArg); 556 break; 557 default: 558 // Other specifiers do not have signed/unsigned variants. 559 break; 560 } 561 562 const analyze_printf::ArgType &ATR = getArgType(Ctx, IsObjCLiteral); 563 if (ATR.isValid() && ATR.matchesType(Ctx, QT)) 564 return true; 565 } 566 567 // Set conversion specifier and disable any flags which do not apply to it. 568 // Let typedefs to char fall through to int, as %c is silly for uint8_t. 569 if (!isa<TypedefType>(QT) && QT->isCharType()) { 570 CS.setKind(ConversionSpecifier::cArg); 571 LM.setKind(LengthModifier::None); 572 Precision.setHowSpecified(OptionalAmount::NotSpecified); 573 HasAlternativeForm = 0; 574 HasLeadingZeroes = 0; 575 HasPlusPrefix = 0; 576 } 577 // Test for Floating type first as LongDouble can pass isUnsignedIntegerType 578 else if (QT->isRealFloatingType()) { 579 CS.setKind(ConversionSpecifier::fArg); 580 } 581 else if (QT->isSignedIntegerType()) { 582 CS.setKind(ConversionSpecifier::dArg); 583 HasAlternativeForm = 0; 584 } 585 else if (QT->isUnsignedIntegerType()) { 586 CS.setKind(ConversionSpecifier::uArg); 587 HasAlternativeForm = 0; 588 HasPlusPrefix = 0; 589 } else { 590 llvm_unreachable("Unexpected type"); 591 } 592 593 return true; 594} 595 596void PrintfSpecifier::toString(raw_ostream &os) const { 597 // Whilst some features have no defined order, we are using the order 598 // appearing in the C99 standard (ISO/IEC 9899:1999 (E) 7.19.6.1) 599 os << "%"; 600 601 // Positional args 602 if (usesPositionalArg()) { 603 os << getPositionalArgIndex() << "$"; 604 } 605 606 // Conversion flags 607 if (IsLeftJustified) os << "-"; 608 if (HasPlusPrefix) os << "+"; 609 if (HasSpacePrefix) os << " "; 610 if (HasAlternativeForm) os << "#"; 611 if (HasLeadingZeroes) os << "0"; 612 613 // Minimum field width 614 FieldWidth.toString(os); 615 // Precision 616 Precision.toString(os); 617 // Length modifier 618 os << LM.toString(); 619 // Conversion specifier 620 os << CS.toString(); 621} 622 623bool PrintfSpecifier::hasValidPlusPrefix() const { 624 if (!HasPlusPrefix) 625 return true; 626 627 // The plus prefix only makes sense for signed conversions 628 switch (CS.getKind()) { 629 case ConversionSpecifier::dArg: 630 case ConversionSpecifier::DArg: 631 case ConversionSpecifier::iArg: 632 case ConversionSpecifier::fArg: 633 case ConversionSpecifier::FArg: 634 case ConversionSpecifier::eArg: 635 case ConversionSpecifier::EArg: 636 case ConversionSpecifier::gArg: 637 case ConversionSpecifier::GArg: 638 case ConversionSpecifier::aArg: 639 case ConversionSpecifier::AArg: 640 case ConversionSpecifier::FreeBSDrArg: 641 return true; 642 643 default: 644 return false; 645 } 646} 647 648bool PrintfSpecifier::hasValidAlternativeForm() const { 649 if (!HasAlternativeForm) 650 return true; 651 652 // Alternate form flag only valid with the oxXaAeEfFgG conversions 653 switch (CS.getKind()) { 654 case ConversionSpecifier::oArg: 655 case ConversionSpecifier::OArg: 656 case ConversionSpecifier::xArg: 657 case ConversionSpecifier::XArg: 658 case ConversionSpecifier::aArg: 659 case ConversionSpecifier::AArg: 660 case ConversionSpecifier::eArg: 661 case ConversionSpecifier::EArg: 662 case ConversionSpecifier::fArg: 663 case ConversionSpecifier::FArg: 664 case ConversionSpecifier::gArg: 665 case ConversionSpecifier::GArg: 666 case ConversionSpecifier::FreeBSDrArg: 667 return true; 668 669 default: 670 return false; 671 } 672} 673 674bool PrintfSpecifier::hasValidLeadingZeros() const { 675 if (!HasLeadingZeroes) 676 return true; 677 678 // Leading zeroes flag only valid with the diouxXaAeEfFgG conversions 679 switch (CS.getKind()) { 680 case ConversionSpecifier::dArg: 681 case ConversionSpecifier::DArg: 682 case ConversionSpecifier::iArg: 683 case ConversionSpecifier::oArg: 684 case ConversionSpecifier::OArg: 685 case ConversionSpecifier::uArg: 686 case ConversionSpecifier::UArg: 687 case ConversionSpecifier::xArg: 688 case ConversionSpecifier::XArg: 689 case ConversionSpecifier::aArg: 690 case ConversionSpecifier::AArg: 691 case ConversionSpecifier::eArg: 692 case ConversionSpecifier::EArg: 693 case ConversionSpecifier::fArg: 694 case ConversionSpecifier::FArg: 695 case ConversionSpecifier::gArg: 696 case ConversionSpecifier::GArg: 697 return true; 698 699 default: 700 return false; 701 } 702} 703 704bool PrintfSpecifier::hasValidSpacePrefix() const { 705 if (!HasSpacePrefix) 706 return true; 707 708 // The space prefix only makes sense for signed conversions 709 switch (CS.getKind()) { 710 case ConversionSpecifier::dArg: 711 case ConversionSpecifier::DArg: 712 case ConversionSpecifier::iArg: 713 case ConversionSpecifier::fArg: 714 case ConversionSpecifier::FArg: 715 case ConversionSpecifier::eArg: 716 case ConversionSpecifier::EArg: 717 case ConversionSpecifier::gArg: 718 case ConversionSpecifier::GArg: 719 case ConversionSpecifier::aArg: 720 case ConversionSpecifier::AArg: 721 return true; 722 723 default: 724 return false; 725 } 726} 727 728bool PrintfSpecifier::hasValidLeftJustified() const { 729 if (!IsLeftJustified) 730 return true; 731 732 // The left justified flag is valid for all conversions except n 733 switch (CS.getKind()) { 734 case ConversionSpecifier::nArg: 735 return false; 736 737 default: 738 return true; 739 } 740} 741 742bool PrintfSpecifier::hasValidThousandsGroupingPrefix() const { 743 if (!HasThousandsGrouping) 744 return true; 745 746 switch (CS.getKind()) { 747 case ConversionSpecifier::dArg: 748 case ConversionSpecifier::DArg: 749 case ConversionSpecifier::iArg: 750 case ConversionSpecifier::uArg: 751 case ConversionSpecifier::UArg: 752 case ConversionSpecifier::fArg: 753 case ConversionSpecifier::FArg: 754 case ConversionSpecifier::gArg: 755 case ConversionSpecifier::GArg: 756 return true; 757 default: 758 return false; 759 } 760} 761 762bool PrintfSpecifier::hasValidPrecision() const { 763 if (Precision.getHowSpecified() == OptionalAmount::NotSpecified) 764 return true; 765 766 // Precision is only valid with the diouxXaAeEfFgGs conversions 767 switch (CS.getKind()) { 768 case ConversionSpecifier::dArg: 769 case ConversionSpecifier::DArg: 770 case ConversionSpecifier::iArg: 771 case ConversionSpecifier::oArg: 772 case ConversionSpecifier::OArg: 773 case ConversionSpecifier::uArg: 774 case ConversionSpecifier::UArg: 775 case ConversionSpecifier::xArg: 776 case ConversionSpecifier::XArg: 777 case ConversionSpecifier::aArg: 778 case ConversionSpecifier::AArg: 779 case ConversionSpecifier::eArg: 780 case ConversionSpecifier::EArg: 781 case ConversionSpecifier::fArg: 782 case ConversionSpecifier::FArg: 783 case ConversionSpecifier::gArg: 784 case ConversionSpecifier::GArg: 785 case ConversionSpecifier::sArg: 786 return true; 787 788 default: 789 return false; 790 } 791} 792bool PrintfSpecifier::hasValidFieldWidth() const { 793 if (FieldWidth.getHowSpecified() == OptionalAmount::NotSpecified) 794 return true; 795 796 // The field width is valid for all conversions except n 797 switch (CS.getKind()) { 798 case ConversionSpecifier::nArg: 799 return false; 800 801 default: 802 return true; 803 } 804} 805