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 19 using clang::analyze_format_string::ArgType; 20 using clang::analyze_format_string::FormatStringHandler; 21 using clang::analyze_format_string::LengthModifier; 22 using clang::analyze_format_string::OptionalAmount; 23 using clang::analyze_format_string::ConversionSpecifier; 24 using clang::analyze_printf::PrintfSpecifier; 25 26 using namespace clang; 27 28 typedef clang::analyze_format_string::SpecifierResult<PrintfSpecifier> 29 PrintfSpecifierResult; 30 31 //===----------------------------------------------------------------------===// 32 // Methods for parsing format strings. 33 //===----------------------------------------------------------------------===// 34 35 using analyze_format_string::ParseNonPositionAmount; 36 37 static 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 52 static 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 // Apple-specific 202 case 'D': 203 if (Target.getTriple().isOSDarwin()) 204 k = ConversionSpecifier::DArg; 205 break; 206 case 'O': 207 if (Target.getTriple().isOSDarwin()) 208 k = ConversionSpecifier::OArg; 209 break; 210 case 'U': 211 if (Target.getTriple().isOSDarwin()) 212 k = ConversionSpecifier::UArg; 213 break; 214 } 215 PrintfConversionSpecifier CS(conversionPosition, k); 216 FS.setConversionSpecifier(CS); 217 if (CS.consumesDataArgument() && !FS.usesPositionalArg()) 218 FS.setArgIndex(argIndex++); 219 220 if (k == ConversionSpecifier::InvalidSpecifier) { 221 // Assume the conversion takes one argument. 222 return !H.HandleInvalidPrintfConversionSpecifier(FS, Start, I - Start); 223 } 224 return PrintfSpecifierResult(Start, FS); 225 } 226 227 bool clang::analyze_format_string::ParsePrintfString(FormatStringHandler &H, 228 const char *I, 229 const char *E, 230 const LangOptions &LO, 231 const TargetInfo &Target) { 232 233 unsigned argIndex = 0; 234 235 // Keep looking for a format specifier until we have exhausted the string. 236 while (I != E) { 237 const PrintfSpecifierResult &FSR = ParsePrintfSpecifier(H, I, E, argIndex, 238 LO, Target); 239 // Did a fail-stop error of any kind occur when parsing the specifier? 240 // If so, don't do any more processing. 241 if (FSR.shouldStop()) 242 return true; 243 // Did we exhaust the string or encounter an error that 244 // we can recover from? 245 if (!FSR.hasValue()) 246 continue; 247 // We have a format specifier. Pass it to the callback. 248 if (!H.HandlePrintfSpecifier(FSR.getValue(), FSR.getStart(), 249 I - FSR.getStart())) 250 return true; 251 } 252 assert(I == E && "Format string not exhausted"); 253 return false; 254 } 255 256 //===----------------------------------------------------------------------===// 257 // Methods on PrintfSpecifier. 258 //===----------------------------------------------------------------------===// 259 260 ArgType PrintfSpecifier::getArgType(ASTContext &Ctx, 261 bool IsObjCLiteral) const { 262 const PrintfConversionSpecifier &CS = getConversionSpecifier(); 263 264 if (!CS.consumesDataArgument()) 265 return ArgType::Invalid(); 266 267 if (CS.getKind() == ConversionSpecifier::cArg) 268 switch (LM.getKind()) { 269 case LengthModifier::None: return Ctx.IntTy; 270 case LengthModifier::AsLong: 271 return ArgType(ArgType::WIntTy, "wint_t"); 272 default: 273 return ArgType::Invalid(); 274 } 275 276 if (CS.isIntArg()) 277 switch (LM.getKind()) { 278 case LengthModifier::AsLongDouble: 279 // GNU extension. 280 return Ctx.LongLongTy; 281 case LengthModifier::None: return Ctx.IntTy; 282 case LengthModifier::AsChar: return ArgType::AnyCharTy; 283 case LengthModifier::AsShort: return Ctx.ShortTy; 284 case LengthModifier::AsLong: return Ctx.LongTy; 285 case LengthModifier::AsLongLong: 286 case LengthModifier::AsQuad: 287 return Ctx.LongLongTy; 288 case LengthModifier::AsIntMax: 289 return ArgType(Ctx.getIntMaxType(), "intmax_t"); 290 case LengthModifier::AsSizeT: 291 // FIXME: How to get the corresponding signed version of size_t? 292 return ArgType(); 293 case LengthModifier::AsPtrDiff: 294 return ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"); 295 case LengthModifier::AsAllocate: 296 case LengthModifier::AsMAllocate: 297 return ArgType::Invalid(); 298 } 299 300 if (CS.isUIntArg()) 301 switch (LM.getKind()) { 302 case LengthModifier::AsLongDouble: 303 // GNU extension. 304 return Ctx.UnsignedLongLongTy; 305 case LengthModifier::None: return Ctx.UnsignedIntTy; 306 case LengthModifier::AsChar: return Ctx.UnsignedCharTy; 307 case LengthModifier::AsShort: return Ctx.UnsignedShortTy; 308 case LengthModifier::AsLong: return Ctx.UnsignedLongTy; 309 case LengthModifier::AsLongLong: 310 case LengthModifier::AsQuad: 311 return Ctx.UnsignedLongLongTy; 312 case LengthModifier::AsIntMax: 313 return ArgType(Ctx.getUIntMaxType(), "uintmax_t"); 314 case LengthModifier::AsSizeT: 315 return ArgType(Ctx.getSizeType(), "size_t"); 316 case LengthModifier::AsPtrDiff: 317 // FIXME: How to get the corresponding unsigned 318 // version of ptrdiff_t? 319 return ArgType(); 320 case LengthModifier::AsAllocate: 321 case LengthModifier::AsMAllocate: 322 return ArgType::Invalid(); 323 } 324 325 if (CS.isDoubleArg()) { 326 if (LM.getKind() == LengthModifier::AsLongDouble) 327 return Ctx.LongDoubleTy; 328 return Ctx.DoubleTy; 329 } 330 331 if (CS.getKind() == ConversionSpecifier::nArg) { 332 switch (LM.getKind()) { 333 case LengthModifier::None: 334 return ArgType::PtrTo(Ctx.IntTy); 335 case LengthModifier::AsChar: 336 return ArgType::PtrTo(Ctx.SignedCharTy); 337 case LengthModifier::AsShort: 338 return ArgType::PtrTo(Ctx.ShortTy); 339 case LengthModifier::AsLong: 340 return ArgType::PtrTo(Ctx.LongTy); 341 case LengthModifier::AsLongLong: 342 case LengthModifier::AsQuad: 343 return ArgType::PtrTo(Ctx.LongLongTy); 344 case LengthModifier::AsIntMax: 345 return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t")); 346 case LengthModifier::AsSizeT: 347 return ArgType(); // FIXME: ssize_t 348 case LengthModifier::AsPtrDiff: 349 return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t")); 350 case LengthModifier::AsLongDouble: 351 return ArgType(); // FIXME: Is this a known extension? 352 case LengthModifier::AsAllocate: 353 case LengthModifier::AsMAllocate: 354 return ArgType::Invalid(); 355 } 356 } 357 358 switch (CS.getKind()) { 359 case ConversionSpecifier::sArg: 360 if (LM.getKind() == LengthModifier::AsWideChar) { 361 if (IsObjCLiteral) 362 return ArgType(Ctx.getPointerType(Ctx.UnsignedShortTy.withConst()), 363 "const unichar *"); 364 return ArgType(ArgType::WCStrTy, "wchar_t *"); 365 } 366 return ArgType::CStrTy; 367 case ConversionSpecifier::SArg: 368 if (IsObjCLiteral) 369 return ArgType(Ctx.getPointerType(Ctx.UnsignedShortTy.withConst()), 370 "const unichar *"); 371 return ArgType(ArgType::WCStrTy, "wchar_t *"); 372 case ConversionSpecifier::CArg: 373 if (IsObjCLiteral) 374 return ArgType(Ctx.UnsignedShortTy, "unichar"); 375 return ArgType(Ctx.WCharTy, "wchar_t"); 376 case ConversionSpecifier::pArg: 377 return ArgType::CPointerTy; 378 case ConversionSpecifier::ObjCObjArg: 379 return ArgType::ObjCPointerTy; 380 default: 381 break; 382 } 383 384 // FIXME: Handle other cases. 385 return ArgType(); 386 } 387 388 bool PrintfSpecifier::fixType(QualType QT, const LangOptions &LangOpt, 389 ASTContext &Ctx, bool IsObjCLiteral) { 390 // %n is different from other conversion specifiers; don't try to fix it. 391 if (CS.getKind() == ConversionSpecifier::nArg) 392 return false; 393 394 // Handle Objective-C objects first. Note that while the '%@' specifier will 395 // not warn for structure pointer or void pointer arguments (because that's 396 // how CoreFoundation objects are implemented), we only show a fixit for '%@' 397 // if we know it's an object (block, id, class, or __attribute__((NSObject))). 398 if (QT->isObjCRetainableType()) { 399 if (!IsObjCLiteral) 400 return false; 401 402 CS.setKind(ConversionSpecifier::ObjCObjArg); 403 404 // Disable irrelevant flags 405 HasThousandsGrouping = false; 406 HasPlusPrefix = false; 407 HasSpacePrefix = false; 408 HasAlternativeForm = false; 409 HasLeadingZeroes = false; 410 Precision.setHowSpecified(OptionalAmount::NotSpecified); 411 LM.setKind(LengthModifier::None); 412 413 return true; 414 } 415 416 // Handle strings next (char *, wchar_t *) 417 if (QT->isPointerType() && (QT->getPointeeType()->isAnyCharacterType())) { 418 CS.setKind(ConversionSpecifier::sArg); 419 420 // Disable irrelevant flags 421 HasAlternativeForm = 0; 422 HasLeadingZeroes = 0; 423 424 // Set the long length modifier for wide characters 425 if (QT->getPointeeType()->isWideCharType()) 426 LM.setKind(LengthModifier::AsWideChar); 427 else 428 LM.setKind(LengthModifier::None); 429 430 return true; 431 } 432 433 // If it's an enum, get its underlying type. 434 if (const EnumType *ETy = QT->getAs<EnumType>()) 435 QT = ETy->getDecl()->getIntegerType(); 436 437 // We can only work with builtin types. 438 const BuiltinType *BT = QT->getAs<BuiltinType>(); 439 if (!BT) 440 return false; 441 442 // Set length modifier 443 switch (BT->getKind()) { 444 case BuiltinType::Bool: 445 case BuiltinType::WChar_U: 446 case BuiltinType::WChar_S: 447 case BuiltinType::Char16: 448 case BuiltinType::Char32: 449 case BuiltinType::UInt128: 450 case BuiltinType::Int128: 451 case BuiltinType::Half: 452 // Various types which are non-trivial to correct. 453 return false; 454 455 #define SIGNED_TYPE(Id, SingletonId) 456 #define UNSIGNED_TYPE(Id, SingletonId) 457 #define FLOATING_TYPE(Id, SingletonId) 458 #define BUILTIN_TYPE(Id, SingletonId) \ 459 case BuiltinType::Id: 460 #include "clang/AST/BuiltinTypes.def" 461 // Misc other stuff which doesn't make sense here. 462 return false; 463 464 case BuiltinType::UInt: 465 case BuiltinType::Int: 466 case BuiltinType::Float: 467 case BuiltinType::Double: 468 LM.setKind(LengthModifier::None); 469 break; 470 471 case BuiltinType::Char_U: 472 case BuiltinType::UChar: 473 case BuiltinType::Char_S: 474 case BuiltinType::SChar: 475 LM.setKind(LengthModifier::AsChar); 476 break; 477 478 case BuiltinType::Short: 479 case BuiltinType::UShort: 480 LM.setKind(LengthModifier::AsShort); 481 break; 482 483 case BuiltinType::Long: 484 case BuiltinType::ULong: 485 LM.setKind(LengthModifier::AsLong); 486 break; 487 488 case BuiltinType::LongLong: 489 case BuiltinType::ULongLong: 490 LM.setKind(LengthModifier::AsLongLong); 491 break; 492 493 case BuiltinType::LongDouble: 494 LM.setKind(LengthModifier::AsLongDouble); 495 break; 496 } 497 498 // Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99. 499 if (isa<TypedefType>(QT) && (LangOpt.C99 || LangOpt.CPlusPlus11)) 500 namedTypeToLengthModifier(QT, LM); 501 502 // If fixing the length modifier was enough, we might be done. 503 if (hasValidLengthModifier(Ctx.getTargetInfo())) { 504 // If we're going to offer a fix anyway, make sure the sign matches. 505 switch (CS.getKind()) { 506 case ConversionSpecifier::uArg: 507 case ConversionSpecifier::UArg: 508 if (QT->isSignedIntegerType()) 509 CS.setKind(clang::analyze_format_string::ConversionSpecifier::dArg); 510 break; 511 case ConversionSpecifier::dArg: 512 case ConversionSpecifier::DArg: 513 case ConversionSpecifier::iArg: 514 if (QT->isUnsignedIntegerType() && !HasPlusPrefix) 515 CS.setKind(clang::analyze_format_string::ConversionSpecifier::uArg); 516 break; 517 default: 518 // Other specifiers do not have signed/unsigned variants. 519 break; 520 } 521 522 const analyze_printf::ArgType &ATR = getArgType(Ctx, IsObjCLiteral); 523 if (ATR.isValid() && ATR.matchesType(Ctx, QT)) 524 return true; 525 } 526 527 // Set conversion specifier and disable any flags which do not apply to it. 528 // Let typedefs to char fall through to int, as %c is silly for uint8_t. 529 if (!isa<TypedefType>(QT) && QT->isCharType()) { 530 CS.setKind(ConversionSpecifier::cArg); 531 LM.setKind(LengthModifier::None); 532 Precision.setHowSpecified(OptionalAmount::NotSpecified); 533 HasAlternativeForm = 0; 534 HasLeadingZeroes = 0; 535 HasPlusPrefix = 0; 536 } 537 // Test for Floating type first as LongDouble can pass isUnsignedIntegerType 538 else if (QT->isRealFloatingType()) { 539 CS.setKind(ConversionSpecifier::fArg); 540 } 541 else if (QT->isSignedIntegerType()) { 542 CS.setKind(ConversionSpecifier::dArg); 543 HasAlternativeForm = 0; 544 } 545 else if (QT->isUnsignedIntegerType()) { 546 CS.setKind(ConversionSpecifier::uArg); 547 HasAlternativeForm = 0; 548 HasPlusPrefix = 0; 549 } else { 550 llvm_unreachable("Unexpected type"); 551 } 552 553 return true; 554 } 555 556 void PrintfSpecifier::toString(raw_ostream &os) const { 557 // Whilst some features have no defined order, we are using the order 558 // appearing in the C99 standard (ISO/IEC 9899:1999 (E) 7.19.6.1) 559 os << "%"; 560 561 // Positional args 562 if (usesPositionalArg()) { 563 os << getPositionalArgIndex() << "$"; 564 } 565 566 // Conversion flags 567 if (IsLeftJustified) os << "-"; 568 if (HasPlusPrefix) os << "+"; 569 if (HasSpacePrefix) os << " "; 570 if (HasAlternativeForm) os << "#"; 571 if (HasLeadingZeroes) os << "0"; 572 573 // Minimum field width 574 FieldWidth.toString(os); 575 // Precision 576 Precision.toString(os); 577 // Length modifier 578 os << LM.toString(); 579 // Conversion specifier 580 os << CS.toString(); 581 } 582 583 bool PrintfSpecifier::hasValidPlusPrefix() const { 584 if (!HasPlusPrefix) 585 return true; 586 587 // The plus prefix only makes sense for signed conversions 588 switch (CS.getKind()) { 589 case ConversionSpecifier::dArg: 590 case ConversionSpecifier::DArg: 591 case ConversionSpecifier::iArg: 592 case ConversionSpecifier::fArg: 593 case ConversionSpecifier::FArg: 594 case ConversionSpecifier::eArg: 595 case ConversionSpecifier::EArg: 596 case ConversionSpecifier::gArg: 597 case ConversionSpecifier::GArg: 598 case ConversionSpecifier::aArg: 599 case ConversionSpecifier::AArg: 600 return true; 601 602 default: 603 return false; 604 } 605 } 606 607 bool 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 return true; 626 627 default: 628 return false; 629 } 630 } 631 632 bool PrintfSpecifier::hasValidLeadingZeros() const { 633 if (!HasLeadingZeroes) 634 return true; 635 636 // Leading zeroes flag only valid with the diouxXaAeEfFgG conversions 637 switch (CS.getKind()) { 638 case ConversionSpecifier::dArg: 639 case ConversionSpecifier::DArg: 640 case ConversionSpecifier::iArg: 641 case ConversionSpecifier::oArg: 642 case ConversionSpecifier::OArg: 643 case ConversionSpecifier::uArg: 644 case ConversionSpecifier::UArg: 645 case ConversionSpecifier::xArg: 646 case ConversionSpecifier::XArg: 647 case ConversionSpecifier::aArg: 648 case ConversionSpecifier::AArg: 649 case ConversionSpecifier::eArg: 650 case ConversionSpecifier::EArg: 651 case ConversionSpecifier::fArg: 652 case ConversionSpecifier::FArg: 653 case ConversionSpecifier::gArg: 654 case ConversionSpecifier::GArg: 655 return true; 656 657 default: 658 return false; 659 } 660 } 661 662 bool PrintfSpecifier::hasValidSpacePrefix() const { 663 if (!HasSpacePrefix) 664 return true; 665 666 // The space prefix only makes sense for signed conversions 667 switch (CS.getKind()) { 668 case ConversionSpecifier::dArg: 669 case ConversionSpecifier::DArg: 670 case ConversionSpecifier::iArg: 671 case ConversionSpecifier::fArg: 672 case ConversionSpecifier::FArg: 673 case ConversionSpecifier::eArg: 674 case ConversionSpecifier::EArg: 675 case ConversionSpecifier::gArg: 676 case ConversionSpecifier::GArg: 677 case ConversionSpecifier::aArg: 678 case ConversionSpecifier::AArg: 679 return true; 680 681 default: 682 return false; 683 } 684 } 685 686 bool PrintfSpecifier::hasValidLeftJustified() const { 687 if (!IsLeftJustified) 688 return true; 689 690 // The left justified flag is valid for all conversions except n 691 switch (CS.getKind()) { 692 case ConversionSpecifier::nArg: 693 return false; 694 695 default: 696 return true; 697 } 698 } 699 700 bool PrintfSpecifier::hasValidThousandsGroupingPrefix() const { 701 if (!HasThousandsGrouping) 702 return true; 703 704 switch (CS.getKind()) { 705 case ConversionSpecifier::dArg: 706 case ConversionSpecifier::DArg: 707 case ConversionSpecifier::iArg: 708 case ConversionSpecifier::uArg: 709 case ConversionSpecifier::UArg: 710 case ConversionSpecifier::fArg: 711 case ConversionSpecifier::FArg: 712 case ConversionSpecifier::gArg: 713 case ConversionSpecifier::GArg: 714 return true; 715 default: 716 return false; 717 } 718 } 719 720 bool PrintfSpecifier::hasValidPrecision() const { 721 if (Precision.getHowSpecified() == OptionalAmount::NotSpecified) 722 return true; 723 724 // Precision is only valid with the diouxXaAeEfFgGs conversions 725 switch (CS.getKind()) { 726 case ConversionSpecifier::dArg: 727 case ConversionSpecifier::DArg: 728 case ConversionSpecifier::iArg: 729 case ConversionSpecifier::oArg: 730 case ConversionSpecifier::OArg: 731 case ConversionSpecifier::uArg: 732 case ConversionSpecifier::UArg: 733 case ConversionSpecifier::xArg: 734 case ConversionSpecifier::XArg: 735 case ConversionSpecifier::aArg: 736 case ConversionSpecifier::AArg: 737 case ConversionSpecifier::eArg: 738 case ConversionSpecifier::EArg: 739 case ConversionSpecifier::fArg: 740 case ConversionSpecifier::FArg: 741 case ConversionSpecifier::gArg: 742 case ConversionSpecifier::GArg: 743 case ConversionSpecifier::sArg: 744 return true; 745 746 default: 747 return false; 748 } 749 } 750 bool PrintfSpecifier::hasValidFieldWidth() const { 751 if (FieldWidth.getHowSpecified() == OptionalAmount::NotSpecified) 752 return true; 753 754 // The field width is valid for all conversions except n 755 switch (CS.getKind()) { 756 case ConversionSpecifier::nArg: 757 return false; 758 759 default: 760 return true; 761 } 762 } 763
