vendor/clang/clang-trunk-r351319

1 files changed, 0 insertions, 953 deletions

diff --git a/lib/Analysis/FormatString.cpp b/lib/Analysis/FormatString.cpp
deleted file mode 100644
index f37e4affae3fc..0000000000000
--- a/lib/Analysis/FormatString.cpp
+++ /dev/null
@@ -1,953 +0,0 @@
-// FormatString.cpp - Common stuff for handling printf/scanf formats -*- C++ -*-
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Shared details for processing format strings of printf and scanf
-// (and friends).
-//
-//===----------------------------------------------------------------------===//
-
-#include "FormatStringParsing.h"
-#include "clang/Basic/LangOptions.h"
-#include "clang/Basic/TargetInfo.h"
-#include "llvm/Support/ConvertUTF.h"
-
-using clang::analyze_format_string::ArgType;
-using clang::analyze_format_string::FormatStringHandler;
-using clang::analyze_format_string::FormatSpecifier;
-using clang::analyze_format_string::LengthModifier;
-using clang::analyze_format_string::OptionalAmount;
-using clang::analyze_format_string::PositionContext;
-using clang::analyze_format_string::ConversionSpecifier;
-using namespace clang;
-
-// Key function to FormatStringHandler.
-FormatStringHandler::~FormatStringHandler() {}
-
-//===----------------------------------------------------------------------===//
-// Functions for parsing format strings components in both printf and
-// scanf format strings.
-//===----------------------------------------------------------------------===//
-
-OptionalAmount
-clang::analyze_format_string::ParseAmount(const char *&Beg, const char *E) {
-  const char *I = Beg;
-  UpdateOnReturn <const char*> UpdateBeg(Beg, I);
-
-  unsigned accumulator = 0;
-  bool hasDigits = false;
-
-  for ( ; I != E; ++I) {
-    char c = *I;
-    if (c >= '0' && c <= '9') {
-      hasDigits = true;
-      accumulator = (accumulator * 10) + (c - '0');
-      continue;
-    }
-
-    if (hasDigits)
-      return OptionalAmount(OptionalAmount::Constant, accumulator, Beg, I - Beg,
-          false);
-
-    break;
-  }
-
-  return OptionalAmount();
-}
-
-OptionalAmount
-clang::analyze_format_string::ParseNonPositionAmount(const char *&Beg,
-                                                     const char *E,
-                                                     unsigned &argIndex) {
-  if (*Beg == '*') {
-    ++Beg;
-    return OptionalAmount(OptionalAmount::Arg, argIndex++, Beg, 0, false);
-  }
-
-  return ParseAmount(Beg, E);
-}
-
-OptionalAmount
-clang::analyze_format_string::ParsePositionAmount(FormatStringHandler &H,
-                                                  const char *Start,
-                                                  const char *&Beg,
-                                                  const char *E,
-                                                  PositionContext p) {
-  if (*Beg == '*') {
-    const char *I = Beg + 1;
-    const OptionalAmount &Amt = ParseAmount(I, E);
-
-    if (Amt.getHowSpecified() == OptionalAmount::NotSpecified) {
-      H.HandleInvalidPosition(Beg, I - Beg, p);
-      return OptionalAmount(false);
-    }
-
-    if (I == E) {
-      // No more characters left?
-      H.HandleIncompleteSpecifier(Start, E - Start);
-      return OptionalAmount(false);
-    }
-
-    assert(Amt.getHowSpecified() == OptionalAmount::Constant);
-
-    if (*I == '$') {
-      // Handle positional arguments
-
-      // Special case: '*0$', since this is an easy mistake.
-      if (Amt.getConstantAmount() == 0) {
-        H.HandleZeroPosition(Beg, I - Beg + 1);
-        return OptionalAmount(false);
-      }
-
-      const char *Tmp = Beg;
-      Beg = ++I;
-
-      return OptionalAmount(OptionalAmount::Arg, Amt.getConstantAmount() - 1,
-                            Tmp, 0, true);
-    }
-
-    H.HandleInvalidPosition(Beg, I - Beg, p);
-    return OptionalAmount(false);
-  }
-
-  return ParseAmount(Beg, E);
-}
-
-
-bool
-clang::analyze_format_string::ParseFieldWidth(FormatStringHandler &H,
-                                              FormatSpecifier &CS,
-                                              const char *Start,
-                                              const char *&Beg, const char *E,
-                                              unsigned *argIndex) {
-  // FIXME: Support negative field widths.
-  if (argIndex) {
-    CS.setFieldWidth(ParseNonPositionAmount(Beg, E, *argIndex));
-  }
-  else {
-    const OptionalAmount Amt =
-      ParsePositionAmount(H, Start, Beg, E,
-                          analyze_format_string::FieldWidthPos);
-
-    if (Amt.isInvalid())
-      return true;
-    CS.setFieldWidth(Amt);
-  }
-  return false;
-}
-
-bool
-clang::analyze_format_string::ParseArgPosition(FormatStringHandler &H,
-                                               FormatSpecifier &FS,
-                                               const char *Start,
-                                               const char *&Beg,
-                                               const char *E) {
-  const char *I = Beg;
-
-  const OptionalAmount &Amt = ParseAmount(I, E);
-
-  if (I == E) {
-    // No more characters left?
-    H.HandleIncompleteSpecifier(Start, E - Start);
-    return true;
-  }
-
-  if (Amt.getHowSpecified() == OptionalAmount::Constant && *(I++) == '$') {
-    // Warn that positional arguments are non-standard.
-    H.HandlePosition(Start, I - Start);
-
-    // Special case: '%0$', since this is an easy mistake.
-    if (Amt.getConstantAmount() == 0) {
-      H.HandleZeroPosition(Start, I - Start);
-      return true;
-    }
-
-    FS.setArgIndex(Amt.getConstantAmount() - 1);
-    FS.setUsesPositionalArg();
-    // Update the caller's pointer if we decided to consume
-    // these characters.
-    Beg = I;
-    return false;
-  }
-
-  return false;
-}
-
-bool
-clang::analyze_format_string::ParseLengthModifier(FormatSpecifier &FS,
-                                                  const char *&I,
-                                                  const char *E,
-                                                  const LangOptions &LO,
-                                                  bool IsScanf) {
-  LengthModifier::Kind lmKind = LengthModifier::None;
-  const char *lmPosition = I;
-  switch (*I) {
-    default:
-      return false;
-    case 'h':
-      ++I;
-      if (I != E && *I == 'h') {
-        ++I;
-        lmKind = LengthModifier::AsChar;
-      } else {
-        lmKind = LengthModifier::AsShort;
-      }
-      break;
-    case 'l':
-      ++I;
-      if (I != E && *I == 'l') {
-        ++I;
-        lmKind = LengthModifier::AsLongLong;
-      } else {
-        lmKind = LengthModifier::AsLong;
-      }
-      break;
-    case 'j': lmKind = LengthModifier::AsIntMax;     ++I; break;
-    case 'z': lmKind = LengthModifier::AsSizeT;      ++I; break;
-    case 't': lmKind = LengthModifier::AsPtrDiff;    ++I; break;
-    case 'L': lmKind = LengthModifier::AsLongDouble; ++I; break;
-    case 'q': lmKind = LengthModifier::AsQuad;       ++I; break;
-    case 'a':
-      if (IsScanf && !LO.C99 && !LO.CPlusPlus11) {
-        // For scanf in C90, look at the next character to see if this should
-        // be parsed as the GNU extension 'a' length modifier. If not, this
-        // will be parsed as a conversion specifier.
-        ++I;
-        if (I != E && (*I == 's' || *I == 'S' || *I == '[')) {
-          lmKind = LengthModifier::AsAllocate;
-          break;
-        }
-        --I;
-      }
-      return false;
-    case 'm':
-      if (IsScanf) {
-        lmKind = LengthModifier::AsMAllocate;
-        ++I;
-        break;
-      }
-      return false;
-    // printf: AsInt64, AsInt32, AsInt3264
-    // scanf:  AsInt64
-    case 'I':
-      if (I + 1 != E && I + 2 != E) {
-        if (I[1] == '6' && I[2] == '4') {
-          I += 3;
-          lmKind = LengthModifier::AsInt64;
-          break;
-        }
-        if (IsScanf)
-          return false;
-
-        if (I[1] == '3' && I[2] == '2') {
-          I += 3;
-          lmKind = LengthModifier::AsInt32;
-          break;
-        }
-      }
-      ++I;
-      lmKind = LengthModifier::AsInt3264;
-      break;
-    case 'w':
-      lmKind = LengthModifier::AsWide; ++I; break;
-  }
-  LengthModifier lm(lmPosition, lmKind);
-  FS.setLengthModifier(lm);
-  return true;
-}
-
-bool clang::analyze_format_string::ParseUTF8InvalidSpecifier(
-    const char *SpecifierBegin, const char *FmtStrEnd, unsigned &Len) {
-  if (SpecifierBegin + 1 >= FmtStrEnd)
-    return false;
-
-  const llvm::UTF8 *SB =
-      reinterpret_cast<const llvm::UTF8 *>(SpecifierBegin + 1);
-  const llvm::UTF8 *SE = reinterpret_cast<const llvm::UTF8 *>(FmtStrEnd);
-  const char FirstByte = *SB;
-
-  // If the invalid specifier is a multibyte UTF-8 string, return the
-  // total length accordingly so that the conversion specifier can be
-  // properly updated to reflect a complete UTF-8 specifier.
-  unsigned NumBytes = llvm::getNumBytesForUTF8(FirstByte);
-  if (NumBytes == 1)
-    return false;
-  if (SB + NumBytes > SE)
-    return false;
-
-  Len = NumBytes + 1;
-  return true;
-}
-
-//===----------------------------------------------------------------------===//
-// Methods on ArgType.
-//===----------------------------------------------------------------------===//
-
-clang::analyze_format_string::ArgType::MatchKind
-ArgType::matchesType(ASTContext &C, QualType argTy) const {
-  if (Ptr) {
-    // It has to be a pointer.
-    const PointerType *PT = argTy->getAs<PointerType>();
-    if (!PT)
-      return NoMatch;
-
-    // We cannot write through a const qualified pointer.
-    if (PT->getPointeeType().isConstQualified())
-      return NoMatch;
-
-    argTy = PT->getPointeeType();
-  }
-
-  switch (K) {
-    case InvalidTy:
-      llvm_unreachable("ArgType must be valid");
-
-    case UnknownTy:
-      return Match;
-
-    case AnyCharTy: {
-      if (const EnumType *ETy = argTy->getAs<EnumType>()) {
-        // If the enum is incomplete we know nothing about the underlying type.
-        // Assume that it's 'int'.
-        if (!ETy->getDecl()->isComplete())
-          return NoMatch;
-        argTy = ETy->getDecl()->getIntegerType();
-      }
-
-      if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
-        switch (BT->getKind()) {
-          default:
-            break;
-          case BuiltinType::Char_S:
-          case BuiltinType::SChar:
-          case BuiltinType::UChar:
-          case BuiltinType::Char_U:
-            return Match;
-        }
-      return NoMatch;
-    }
-
-    case SpecificTy: {
-      if (const EnumType *ETy = argTy->getAs<EnumType>()) {
-        // If the enum is incomplete we know nothing about the underlying type.
-        // Assume that it's 'int'.
-        if (!ETy->getDecl()->isComplete())
-          argTy = C.IntTy;
-        else
-          argTy = ETy->getDecl()->getIntegerType();
-      }
-      argTy = C.getCanonicalType(argTy).getUnqualifiedType();
-
-      if (T == argTy)
-        return Match;
-      // Check for "compatible types".
-      if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
-        switch (BT->getKind()) {
-          default:
-            break;
-          case BuiltinType::Char_S:
-          case BuiltinType::SChar:
-          case BuiltinType::Char_U:
-          case BuiltinType::UChar:
-            return T == C.UnsignedCharTy || T == C.SignedCharTy ? Match
-                                                                : NoMatch;
-          case BuiltinType::Short:
-            return T == C.UnsignedShortTy ? Match : NoMatch;
-          case BuiltinType::UShort:
-            return T == C.ShortTy ? Match : NoMatch;
-          case BuiltinType::Int:
-            return T == C.UnsignedIntTy ? Match : NoMatch;
-          case BuiltinType::UInt:
-            return T == C.IntTy ? Match : NoMatch;
-          case BuiltinType::Long:
-            return T == C.UnsignedLongTy ? Match : NoMatch;
-          case BuiltinType::ULong:
-            return T == C.LongTy ? Match : NoMatch;
-          case BuiltinType::LongLong:
-            return T == C.UnsignedLongLongTy ? Match : NoMatch;
-          case BuiltinType::ULongLong:
-            return T == C.LongLongTy ? Match : NoMatch;
-        }
-      return NoMatch;
-    }
-
-    case CStrTy: {
-      const PointerType *PT = argTy->getAs<PointerType>();
-      if (!PT)
-        return NoMatch;
-      QualType pointeeTy = PT->getPointeeType();
-      if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
-        switch (BT->getKind()) {
-          case BuiltinType::Void:
-          case BuiltinType::Char_U:
-          case BuiltinType::UChar:
-          case BuiltinType::Char_S:
-          case BuiltinType::SChar:
-            return Match;
-          default:
-            break;
-        }
-
-      return NoMatch;
-    }
-
-    case WCStrTy: {
-      const PointerType *PT = argTy->getAs<PointerType>();
-      if (!PT)
-        return NoMatch;
-      QualType pointeeTy =
-        C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
-      return pointeeTy == C.getWideCharType() ? Match : NoMatch;
-    }
-
-    case WIntTy: {
-
-      QualType PromoArg =
-        argTy->isPromotableIntegerType()
-          ? C.getPromotedIntegerType(argTy) : argTy;
-
-      QualType WInt = C.getCanonicalType(C.getWIntType()).getUnqualifiedType();
-      PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
-
-      // If the promoted argument is the corresponding signed type of the
-      // wint_t type, then it should match.
-      if (PromoArg->hasSignedIntegerRepresentation() &&
-          C.getCorrespondingUnsignedType(PromoArg) == WInt)
-        return Match;
-
-      return WInt == PromoArg ? Match : NoMatch;
-    }
-
-    case CPointerTy:
-      if (argTy->isVoidPointerType()) {
-        return Match;
-      } if (argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
-            argTy->isBlockPointerType() || argTy->isNullPtrType()) {
-        return NoMatchPedantic;
-      } else {
-        return NoMatch;
-      }
-
-    case ObjCPointerTy: {
-      if (argTy->getAs<ObjCObjectPointerType>() ||
-          argTy->getAs<BlockPointerType>())
-        return Match;
-
-      // Handle implicit toll-free bridging.
-      if (const PointerType *PT = argTy->getAs<PointerType>()) {
-        // Things such as CFTypeRef are really just opaque pointers
-        // to C structs representing CF types that can often be bridged
-        // to Objective-C objects.  Since the compiler doesn't know which
-        // structs can be toll-free bridged, we just accept them all.
-        QualType pointee = PT->getPointeeType();
-        if (pointee->getAsStructureType() || pointee->isVoidType())
-          return Match;
-      }
-      return NoMatch;
-    }
-  }
-
-  llvm_unreachable("Invalid ArgType Kind!");
-}
-
-QualType ArgType::getRepresentativeType(ASTContext &C) const {
-  QualType Res;
-  switch (K) {
-    case InvalidTy:
-      llvm_unreachable("No representative type for Invalid ArgType");
-    case UnknownTy:
-      llvm_unreachable("No representative type for Unknown ArgType");
-    case AnyCharTy:
-      Res = C.CharTy;
-      break;
-    case SpecificTy:
-      Res = T;
-      break;
-    case CStrTy:
-      Res = C.getPointerType(C.CharTy);
-      break;
-    case WCStrTy:
-      Res = C.getPointerType(C.getWideCharType());
-      break;
-    case ObjCPointerTy:
-      Res = C.ObjCBuiltinIdTy;
-      break;
-    case CPointerTy:
-      Res = C.VoidPtrTy;
-      break;
-    case WIntTy: {
-      Res = C.getWIntType();
-      break;
-    }
-  }
-
-  if (Ptr)
-    Res = C.getPointerType(Res);
-  return Res;
-}
-
-std::string ArgType::getRepresentativeTypeName(ASTContext &C) const {
-  std::string S = getRepresentativeType(C).getAsString();
-
-  std::string Alias;
-  if (Name) {
-    // Use a specific name for this type, e.g. "size_t".
-    Alias = Name;
-    if (Ptr) {
-      // If ArgType is actually a pointer to T, append an asterisk.
-      Alias += (Alias[Alias.size()-1] == '*') ? "*" : " *";
-    }
-    // If Alias is the same as the underlying type, e.g. wchar_t, then drop it.
-    if (S == Alias)
-      Alias.clear();
-  }
-
-  if (!Alias.empty())
-    return std::string("'") + Alias + "' (aka '" + S + "')";
-  return std::string("'") + S + "'";
-}
-
-
-//===----------------------------------------------------------------------===//
-// Methods on OptionalAmount.
-//===----------------------------------------------------------------------===//
-
-ArgType
-analyze_format_string::OptionalAmount::getArgType(ASTContext &Ctx) const {
-  return Ctx.IntTy;
-}
-
-//===----------------------------------------------------------------------===//
-// Methods on LengthModifier.
-//===----------------------------------------------------------------------===//
-
-const char *
-analyze_format_string::LengthModifier::toString() const {
-  switch (kind) {
-  case AsChar:
-    return "hh";
-  case AsShort:
-    return "h";
-  case AsLong: // or AsWideChar
-    return "l";
-  case AsLongLong:
-    return "ll";
-  case AsQuad:
-    return "q";
-  case AsIntMax:
-    return "j";
-  case AsSizeT:
-    return "z";
-  case AsPtrDiff:
-    return "t";
-  case AsInt32:
-    return "I32";
-  case AsInt3264:
-    return "I";
-  case AsInt64:
-    return "I64";
-  case AsLongDouble:
-    return "L";
-  case AsAllocate:
-    return "a";
-  case AsMAllocate:
-    return "m";
-  case AsWide:
-    return "w";
-  case None:
-    return "";
-  }
-  return nullptr;
-}
-
-//===----------------------------------------------------------------------===//
-// Methods on ConversionSpecifier.
-//===----------------------------------------------------------------------===//
-
-const char *ConversionSpecifier::toString() const {
-  switch (kind) {
-  case dArg: return "d";
-  case DArg: return "D";
-  case iArg: return "i";
-  case oArg: return "o";
-  case OArg: return "O";
-  case uArg: return "u";
-  case UArg: return "U";
-  case xArg: return "x";
-  case XArg: return "X";
-  case fArg: return "f";
-  case FArg: return "F";
-  case eArg: return "e";
-  case EArg: return "E";
-  case gArg: return "g";
-  case GArg: return "G";
-  case aArg: return "a";
-  case AArg: return "A";
-  case cArg: return "c";
-  case sArg: return "s";
-  case pArg: return "p";
-  case PArg:
-    return "P";
-  case nArg: return "n";
-  case PercentArg:  return "%";
-  case ScanListArg: return "[";
-  case InvalidSpecifier: return nullptr;
-
-  // POSIX unicode extensions.
-  case CArg: return "C";
-  case SArg: return "S";
-
-  // Objective-C specific specifiers.
-  case ObjCObjArg: return "@";
-
-  // FreeBSD kernel specific specifiers.
-  case FreeBSDbArg: return "b";
-  case FreeBSDDArg: return "D";
-  case FreeBSDrArg: return "r";
-  case FreeBSDyArg: return "y";
-
-  // GlibC specific specifiers.
-  case PrintErrno: return "m";
-
-  // MS specific specifiers.
-  case ZArg: return "Z";
-  }
-  return nullptr;
-}
-
-Optional<ConversionSpecifier>
-ConversionSpecifier::getStandardSpecifier() const {
-  ConversionSpecifier::Kind NewKind;
-
-  switch (getKind()) {
-  default:
-    return None;
-  case DArg:
-    NewKind = dArg;
-    break;
-  case UArg:
-    NewKind = uArg;
-    break;
-  case OArg:
-    NewKind = oArg;
-    break;
-  }
-
-  ConversionSpecifier FixedCS(*this);
-  FixedCS.setKind(NewKind);
-  return FixedCS;
-}
-
-//===----------------------------------------------------------------------===//
-// Methods on OptionalAmount.
-//===----------------------------------------------------------------------===//
-
-void OptionalAmount::toString(raw_ostream &os) const {
-  switch (hs) {
-  case Invalid:
-  case NotSpecified:
-    return;
-  case Arg:
-    if (UsesDotPrefix)
-        os << ".";
-    if (usesPositionalArg())
-      os << "*" << getPositionalArgIndex() << "$";
-    else
-      os << "*";
-    break;
-  case Constant:
-    if (UsesDotPrefix)
-        os << ".";
-    os << amt;
-    break;
-  }
-}
-
-bool FormatSpecifier::hasValidLengthModifier(const TargetInfo &Target) const {
-  switch (LM.getKind()) {
-    case LengthModifier::None:
-      return true;
-
-    // Handle most integer flags
-    case LengthModifier::AsShort:
-      if (Target.getTriple().isOSMSVCRT()) {
-        switch (CS.getKind()) {
-          case ConversionSpecifier::cArg:
-          case ConversionSpecifier::CArg:
-          case ConversionSpecifier::sArg:
-          case ConversionSpecifier::SArg:
-          case ConversionSpecifier::ZArg:
-            return true;
-          default:
-            break;
-        }
-      }
-      // Fall through.
-    case LengthModifier::AsChar:
-    case LengthModifier::AsLongLong:
-    case LengthModifier::AsQuad:
-    case LengthModifier::AsIntMax:
-    case LengthModifier::AsSizeT:
-    case LengthModifier::AsPtrDiff:
-      switch (CS.getKind()) {
-        case ConversionSpecifier::dArg:
-        case ConversionSpecifier::DArg:
-        case ConversionSpecifier::iArg:
-        case ConversionSpecifier::oArg:
-        case ConversionSpecifier::OArg:
-        case ConversionSpecifier::uArg:
-        case ConversionSpecifier::UArg:
-        case ConversionSpecifier::xArg:
-        case ConversionSpecifier::XArg:
-        case ConversionSpecifier::nArg:
-          return true;
-        case ConversionSpecifier::FreeBSDrArg:
-        case ConversionSpecifier::FreeBSDyArg:
-          return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
-        default:
-          return false;
-      }
-
-    // Handle 'l' flag
-    case LengthModifier::AsLong: // or AsWideChar
-      switch (CS.getKind()) {
-        case ConversionSpecifier::dArg:
-        case ConversionSpecifier::DArg:
-        case ConversionSpecifier::iArg:
-        case ConversionSpecifier::oArg:
-        case ConversionSpecifier::OArg:
-        case ConversionSpecifier::uArg:
-        case ConversionSpecifier::UArg:
-        case ConversionSpecifier::xArg:
-        case ConversionSpecifier::XArg:
-        case ConversionSpecifier::aArg:
-        case ConversionSpecifier::AArg:
-        case ConversionSpecifier::fArg:
-        case ConversionSpecifier::FArg:
-        case ConversionSpecifier::eArg:
-        case ConversionSpecifier::EArg:
-        case ConversionSpecifier::gArg:
-        case ConversionSpecifier::GArg:
-        case ConversionSpecifier::nArg:
-        case ConversionSpecifier::cArg:
-        case ConversionSpecifier::sArg:
-        case ConversionSpecifier::ScanListArg:
-        case ConversionSpecifier::ZArg:
-          return true;
-        case ConversionSpecifier::FreeBSDrArg:
-        case ConversionSpecifier::FreeBSDyArg:
-          return Target.getTriple().isOSFreeBSD() || Target.getTriple().isPS4();
-        default:
-          return false;
-      }
-
-    case LengthModifier::AsLongDouble:
-      switch (CS.getKind()) {
-        case ConversionSpecifier::aArg:
-        case ConversionSpecifier::AArg:
-        case ConversionSpecifier::fArg:
-        case ConversionSpecifier::FArg:
-        case ConversionSpecifier::eArg:
-        case ConversionSpecifier::EArg:
-        case ConversionSpecifier::gArg:
-        case ConversionSpecifier::GArg:
-          return true;
-        // GNU libc extension.
-        case ConversionSpecifier::dArg:
-        case ConversionSpecifier::iArg:
-        case ConversionSpecifier::oArg:
-        case ConversionSpecifier::uArg:
-        case ConversionSpecifier::xArg:
-        case ConversionSpecifier::XArg:
-          return !Target.getTriple().isOSDarwin() &&
-                 !Target.getTriple().isOSWindows();
-        default:
-          return false;
-      }
-
-    case LengthModifier::AsAllocate:
-      switch (CS.getKind()) {
-        case ConversionSpecifier::sArg:
-        case ConversionSpecifier::SArg:
-        case ConversionSpecifier::ScanListArg:
-          return true;
-        default:
-          return false;
-      }
-
-    case LengthModifier::AsMAllocate:
-      switch (CS.getKind()) {
-        case ConversionSpecifier::cArg:
-        case ConversionSpecifier::CArg:
-        case ConversionSpecifier::sArg:
-        case ConversionSpecifier::SArg:
-        case ConversionSpecifier::ScanListArg:
-          return true;
-        default:
-          return false;
-      }
-    case LengthModifier::AsInt32:
-    case LengthModifier::AsInt3264:
-    case LengthModifier::AsInt64:
-      switch (CS.getKind()) {
-        case ConversionSpecifier::dArg:
-        case ConversionSpecifier::iArg:
-        case ConversionSpecifier::oArg:
-        case ConversionSpecifier::uArg:
-        case ConversionSpecifier::xArg:
-        case ConversionSpecifier::XArg:
-          return Target.getTriple().isOSMSVCRT();
-        default:
-          return false;
-      }
-    case LengthModifier::AsWide:
-      switch (CS.getKind()) {
-        case ConversionSpecifier::cArg:
-        case ConversionSpecifier::CArg:
-        case ConversionSpecifier::sArg:
-        case ConversionSpecifier::SArg:
-        case ConversionSpecifier::ZArg:
-          return Target.getTriple().isOSMSVCRT();
-        default:
-          return false;
-      }
-  }
-  llvm_unreachable("Invalid LengthModifier Kind!");
-}
-
-bool FormatSpecifier::hasStandardLengthModifier() const {
-  switch (LM.getKind()) {
-    case LengthModifier::None:
-    case LengthModifier::AsChar:
-    case LengthModifier::AsShort:
-    case LengthModifier::AsLong:
-    case LengthModifier::AsLongLong:
-    case LengthModifier::AsIntMax:
-    case LengthModifier::AsSizeT:
-    case LengthModifier::AsPtrDiff:
-    case LengthModifier::AsLongDouble:
-      return true;
-    case LengthModifier::AsAllocate:
-    case LengthModifier::AsMAllocate:
-    case LengthModifier::AsQuad:
-    case LengthModifier::AsInt32:
-    case LengthModifier::AsInt3264:
-    case LengthModifier::AsInt64:
-    case LengthModifier::AsWide:
-      return false;
-  }
-  llvm_unreachable("Invalid LengthModifier Kind!");
-}
-
-bool FormatSpecifier::hasStandardConversionSpecifier(
-    const LangOptions &LangOpt) const {
-  switch (CS.getKind()) {
-    case ConversionSpecifier::cArg:
-    case ConversionSpecifier::dArg:
-    case ConversionSpecifier::iArg:
-    case ConversionSpecifier::oArg:
-    case ConversionSpecifier::uArg:
-    case ConversionSpecifier::xArg:
-    case ConversionSpecifier::XArg:
-    case ConversionSpecifier::fArg:
-    case ConversionSpecifier::FArg:
-    case ConversionSpecifier::eArg:
-    case ConversionSpecifier::EArg:
-    case ConversionSpecifier::gArg:
-    case ConversionSpecifier::GArg:
-    case ConversionSpecifier::aArg:
-    case ConversionSpecifier::AArg:
-    case ConversionSpecifier::sArg:
-    case ConversionSpecifier::pArg:
-    case ConversionSpecifier::nArg:
-    case ConversionSpecifier::ObjCObjArg:
-    case ConversionSpecifier::ScanListArg:
-    case ConversionSpecifier::PercentArg:
-    case ConversionSpecifier::PArg:
-      return true;
-    case ConversionSpecifier::CArg:
-    case ConversionSpecifier::SArg:
-      return LangOpt.ObjC1 || LangOpt.ObjC2;
-    case ConversionSpecifier::InvalidSpecifier:
-    case ConversionSpecifier::FreeBSDbArg:
-    case ConversionSpecifier::FreeBSDDArg:
-    case ConversionSpecifier::FreeBSDrArg:
-    case ConversionSpecifier::FreeBSDyArg:
-    case ConversionSpecifier::PrintErrno:
-    case ConversionSpecifier::DArg:
-    case ConversionSpecifier::OArg:
-    case ConversionSpecifier::UArg:
-    case ConversionSpecifier::ZArg:
-      return false;
-  }
-  llvm_unreachable("Invalid ConversionSpecifier Kind!");
-}
-
-bool FormatSpecifier::hasStandardLengthConversionCombination() const {
-  if (LM.getKind() == LengthModifier::AsLongDouble) {
-    switch(CS.getKind()) {
-        case ConversionSpecifier::dArg:
-        case ConversionSpecifier::iArg:
-        case ConversionSpecifier::oArg:
-        case ConversionSpecifier::uArg:
-        case ConversionSpecifier::xArg:
-        case ConversionSpecifier::XArg:
-          return false;
-        default:
-          return true;
-    }
-  }
-  return true;
-}
-
-Optional<LengthModifier> FormatSpecifier::getCorrectedLengthModifier() const {
-  if (CS.isAnyIntArg() || CS.getKind() == ConversionSpecifier::nArg) {
-    if (LM.getKind() == LengthModifier::AsLongDouble ||
-        LM.getKind() == LengthModifier::AsQuad) {
-      LengthModifier FixedLM(LM);
-      FixedLM.setKind(LengthModifier::AsLongLong);
-      return FixedLM;
-    }
-  }
-
-  return None;
-}
-
-bool FormatSpecifier::namedTypeToLengthModifier(QualType QT,
-                                                LengthModifier &LM) {
-  assert(isa<TypedefType>(QT) && "Expected a TypedefType");
-  const TypedefNameDecl *Typedef = cast<TypedefType>(QT)->getDecl();
-
-  for (;;) {
-    const IdentifierInfo *Identifier = Typedef->getIdentifier();
-    if (Identifier->getName() == "size_t") {
-      LM.setKind(LengthModifier::AsSizeT);
-      return true;
-    } else if (Identifier->getName() == "ssize_t") {
-      // Not C99, but common in Unix.
-      LM.setKind(LengthModifier::AsSizeT);
-      return true;
-    } else if (Identifier->getName() == "intmax_t") {
-      LM.setKind(LengthModifier::AsIntMax);
-      return true;
-    } else if (Identifier->getName() == "uintmax_t") {
-      LM.setKind(LengthModifier::AsIntMax);
-      return true;
-    } else if (Identifier->getName() == "ptrdiff_t") {
-      LM.setKind(LengthModifier::AsPtrDiff);
-      return true;
-    }
-
-    QualType T = Typedef->getUnderlyingType();
-    if (!isa<TypedefType>(T))
-      break;
-
-    Typedef = cast<TypedefType>(T)->getDecl();
-  }
-  return false;
-}