C++ ASTContext::getSizeType方法代码示例

static uint64_t CalculateCookiePadding(ASTContext &Ctx, const CXXNewExpr *E) {
  if (!E->isArray())
    return 0;
  
  QualType T = E->getAllocatedType();
  
  const RecordType *RT = T->getAs<RecordType>();
  if (!RT)
    return 0;
  
  const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
  if (!RD)
    return 0;
  
  // Check if the class has a trivial destructor.
  if (RD->hasTrivialDestructor()) {
    // FIXME: Check for a two-argument delete.
    return 0;
  }
  
  // Padding is the maximum of sizeof(size_t) and alignof(T)
  return std::max(Ctx.getTypeSize(Ctx.getSizeType()),
                  static_cast<uint64_t>(Ctx.getTypeAlign(T))) / 8;
}

ArgType PrintfSpecifier::getArgType(ASTContext &Ctx,
                                    bool IsObjCLiteral) const {
  const PrintfConversionSpecifier &CS = getConversionSpecifier();

  if (!CS.consumesDataArgument())
    return ArgType::Invalid();

  if (CS.getKind() == ConversionSpecifier::cArg)
    switch (LM.getKind()) {
      case LengthModifier::None:
        return Ctx.IntTy;
      case LengthModifier::AsLong:
      case LengthModifier::AsWide:
        return ArgType(ArgType::WIntTy, "wint_t");
      case LengthModifier::AsShort:
        if (Ctx.getTargetInfo().getTriple().isOSMSVCRT())
          return Ctx.IntTy;
        LLVM_FALLTHROUGH;
      default:
        return ArgType::Invalid();
    }

  if (CS.isIntArg())
    switch (LM.getKind()) {
      case LengthModifier::AsLongDouble:
        // GNU extension.
        return Ctx.LongLongTy;
      case LengthModifier::None:
        return Ctx.IntTy;
      case LengthModifier::AsInt32:
        return ArgType(Ctx.IntTy, "__int32");
      case LengthModifier::AsChar: return ArgType::AnyCharTy;
      case LengthModifier::AsShort: return Ctx.ShortTy;
      case LengthModifier::AsLong: return Ctx.LongTy;
      case LengthModifier::AsLongLong:
      case LengthModifier::AsQuad:
        return Ctx.LongLongTy;
      case LengthModifier::AsInt64:
        return ArgType(Ctx.LongLongTy, "__int64");
      case LengthModifier::AsIntMax:
        return ArgType(Ctx.getIntMaxType(), "intmax_t");
      case LengthModifier::AsSizeT:
        // FIXME: How to get the corresponding signed version of size_t?
        return ArgType();
      case LengthModifier::AsInt3264:
        return Ctx.getTargetInfo().getTriple().isArch64Bit()
                   ? ArgType(Ctx.LongLongTy, "__int64")
                   : ArgType(Ctx.IntTy, "__int32");
      case LengthModifier::AsPtrDiff:
        return ArgType(Ctx.getPointerDiffType(), "ptrdiff_t");
      case LengthModifier::AsAllocate:
      case LengthModifier::AsMAllocate:
      case LengthModifier::AsWide:
        return ArgType::Invalid();
    }

  if (CS.isUIntArg())
    switch (LM.getKind()) {
      case LengthModifier::AsLongDouble:
        // GNU extension.
        return Ctx.UnsignedLongLongTy;
      case LengthModifier::None:
        return Ctx.UnsignedIntTy;
      case LengthModifier::AsInt32:
        return ArgType(Ctx.UnsignedIntTy, "unsigned __int32");
      case LengthModifier::AsChar: return Ctx.UnsignedCharTy;
      case LengthModifier::AsShort: return Ctx.UnsignedShortTy;
      case LengthModifier::AsLong: return Ctx.UnsignedLongTy;
      case LengthModifier::AsLongLong:
      case LengthModifier::AsQuad:
        return Ctx.UnsignedLongLongTy;
      case LengthModifier::AsInt64:
        return ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64");
      case LengthModifier::AsIntMax:
        return ArgType(Ctx.getUIntMaxType(), "uintmax_t");
      case LengthModifier::AsSizeT:
        return ArgType(Ctx.getSizeType(), "size_t");
      case LengthModifier::AsInt3264:
        return Ctx.getTargetInfo().getTriple().isArch64Bit()
                   ? ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64")
                   : ArgType(Ctx.UnsignedIntTy, "unsigned __int32");
      case LengthModifier::AsPtrDiff:
        // FIXME: How to get the corresponding unsigned
        // version of ptrdiff_t?
        return ArgType();
      case LengthModifier::AsAllocate:
      case LengthModifier::AsMAllocate:
      case LengthModifier::AsWide:
        return ArgType::Invalid();
    }

  if (CS.isDoubleArg()) {
    if (LM.getKind() == LengthModifier::AsLongDouble)
      return Ctx.LongDoubleTy;
    return Ctx.DoubleTy;
  }

  if (CS.getKind() == ConversionSpecifier::nArg) {
    switch (LM.getKind()) {
      case LengthModifier::None:
//.........这里部分代码省略.........

ScanfArgTypeResult ScanfSpecifier::getArgType(ASTContext &Ctx) const {
  const ScanfConversionSpecifier &CS = getConversionSpecifier();

  if (!CS.consumesDataArgument())
    return ScanfArgTypeResult::Invalid();

  switch(CS.getKind()) {
    // Signed int.
    case ConversionSpecifier::dArg:
    case ConversionSpecifier::iArg:
      switch (LM.getKind()) {
        case LengthModifier::None: return ArgTypeResult(Ctx.IntTy);
        case LengthModifier::AsChar:
          return ArgTypeResult(ArgTypeResult::AnyCharTy);
        case LengthModifier::AsShort: return ArgTypeResult(Ctx.ShortTy);
        case LengthModifier::AsLong: return ArgTypeResult(Ctx.LongTy);
        case LengthModifier::AsLongLong: return ArgTypeResult(Ctx.LongLongTy);
        case LengthModifier::AsIntMax:
          return ScanfArgTypeResult(Ctx.getIntMaxType(), "intmax_t *");
        case LengthModifier::AsSizeT:
          // FIXME: ssize_t.
          return ScanfArgTypeResult();
        case LengthModifier::AsPtrDiff:
          return ScanfArgTypeResult(Ctx.getPointerDiffType(), "ptrdiff_t *");
        case LengthModifier::AsLongDouble: return ScanfArgTypeResult::Invalid();
        case LengthModifier::AsAllocate: return ScanfArgTypeResult::Invalid();
        case LengthModifier::AsMAllocate: return ScanfArgTypeResult::Invalid();
      }

    // Unsigned int.
    case ConversionSpecifier::oArg:
    case ConversionSpecifier::uArg:
    case ConversionSpecifier::xArg:
    case ConversionSpecifier::XArg:
      switch (LM.getKind()) {
        case LengthModifier::None: return ArgTypeResult(Ctx.UnsignedIntTy);
        case LengthModifier::AsChar: return ArgTypeResult(Ctx.UnsignedCharTy);
        case LengthModifier::AsShort: return ArgTypeResult(Ctx.UnsignedShortTy);
        case LengthModifier::AsLong: return ArgTypeResult(Ctx.UnsignedLongTy);
        case LengthModifier::AsLongLong:
          return ArgTypeResult(Ctx.UnsignedLongLongTy);
        case LengthModifier::AsIntMax:
          return ScanfArgTypeResult(Ctx.getUIntMaxType(), "uintmax_t *");
        case LengthModifier::AsSizeT:
          return ScanfArgTypeResult(Ctx.getSizeType(), "size_t *");
        case LengthModifier::AsPtrDiff:
          // FIXME: Unsigned version of ptrdiff_t?
          return ScanfArgTypeResult();
        case LengthModifier::AsLongDouble: return ScanfArgTypeResult::Invalid();
        case LengthModifier::AsAllocate: return ScanfArgTypeResult::Invalid();
        case LengthModifier::AsMAllocate: return ScanfArgTypeResult::Invalid();
      }

    // Float.
    case ConversionSpecifier::aArg:
    case ConversionSpecifier::AArg:
    case ConversionSpecifier::eArg:
    case ConversionSpecifier::EArg:
    case ConversionSpecifier::fArg:
    case ConversionSpecifier::FArg:
    case ConversionSpecifier::gArg:
    case ConversionSpecifier::GArg:
      switch (LM.getKind()) {
        case LengthModifier::None: return ArgTypeResult(Ctx.FloatTy);
        case LengthModifier::AsLong: return ArgTypeResult(Ctx.DoubleTy);
        case LengthModifier::AsLongDouble:
          return ArgTypeResult(Ctx.LongDoubleTy);
        default:
          return ScanfArgTypeResult::Invalid();
      }

    // Char, string and scanlist.
    case ConversionSpecifier::cArg:
    case ConversionSpecifier::sArg:
    case ConversionSpecifier::ScanListArg:
      switch (LM.getKind()) {
        case LengthModifier::None: return ScanfArgTypeResult::CStrTy;
        case LengthModifier::AsLong:
          return ScanfArgTypeResult(ScanfArgTypeResult::WCStrTy, "wchar_t *");
        case LengthModifier::AsAllocate:
        case LengthModifier::AsMAllocate:
          return ScanfArgTypeResult(ArgTypeResult::CStrTy);
        default:
          return ScanfArgTypeResult::Invalid();
      }
    case ConversionSpecifier::CArg:
    case ConversionSpecifier::SArg:
      // FIXME: Mac OS X specific?
      switch (LM.getKind()) {
        case LengthModifier::None:
          return ScanfArgTypeResult(ScanfArgTypeResult::WCStrTy, "wchar_t *");
        case LengthModifier::AsAllocate:
        case LengthModifier::AsMAllocate:
          return ScanfArgTypeResult(ArgTypeResult::WCStrTy, "wchar_t **");
        default:
          return ScanfArgTypeResult::Invalid();
      }

    // Pointer.
    case ConversionSpecifier::pArg:
//.........这里部分代码省略.........

QualType SymbolExtent::getType(ASTContext &Ctx) const {
  return Ctx.getSizeType();
}

/// DecodeTypeFromStr - This decodes one type descriptor from Str, advancing the
/// pointer over the consumed characters.  This returns the resultant type.
static QualType DecodeTypeFromStr(const char *&Str, ASTContext &Context, 
                                  Builtin::Context::GetBuiltinTypeError &Error,
                                  bool AllowTypeModifiers = true) {
  // Modifiers.
  int HowLong = 0;
  bool Signed = false, Unsigned = false;
  
  // Read the modifiers first.
  bool Done = false;
  while (!Done) {
    switch (*Str++) {
    default: Done = true; --Str; break; 
    case 'S':
      assert(!Unsigned && "Can't use both 'S' and 'U' modifiers!");
      assert(!Signed && "Can't use 'S' modifier multiple times!");
      Signed = true;
      break;
    case 'U':
      assert(!Signed && "Can't use both 'S' and 'U' modifiers!");
      assert(!Unsigned && "Can't use 'S' modifier multiple times!");
      Unsigned = true;
      break;
    case 'L':
      assert(HowLong <= 2 && "Can't have LLLL modifier");
      ++HowLong;
      break;
    }
  }

  QualType Type;
  
  // Read the base type.
  switch (*Str++) {
  default: assert(0 && "Unknown builtin type letter!");
  case 'v':
    assert(HowLong == 0 && !Signed && !Unsigned &&
           "Bad modifiers used with 'v'!");
    Type = Context.VoidTy;
    break;
  case 'f':
    assert(HowLong == 0 && !Signed && !Unsigned &&
           "Bad modifiers used with 'f'!");
    Type = Context.FloatTy;
    break;
  case 'd':
    assert(HowLong < 2 && !Signed && !Unsigned &&
           "Bad modifiers used with 'd'!");
    if (HowLong)
      Type = Context.LongDoubleTy;
    else
      Type = Context.DoubleTy;
    break;
  case 's':
    assert(HowLong == 0 && "Bad modifiers used with 's'!");
    if (Unsigned)
      Type = Context.UnsignedShortTy;
    else
      Type = Context.ShortTy;
    break;
  case 'i':
    if (HowLong == 3)
      Type = Unsigned ? Context.UnsignedInt128Ty : Context.Int128Ty;
    else if (HowLong == 2)
      Type = Unsigned ? Context.UnsignedLongLongTy : Context.LongLongTy;
    else if (HowLong == 1)
      Type = Unsigned ? Context.UnsignedLongTy : Context.LongTy;
    else
      Type = Unsigned ? Context.UnsignedIntTy : Context.IntTy;
    break;
  case 'c':
    assert(HowLong == 0 && "Bad modifiers used with 'c'!");
    if (Signed)
      Type = Context.SignedCharTy;
    else if (Unsigned)
      Type = Context.UnsignedCharTy;
    else
      Type = Context.CharTy;
    break;
  case 'b': // boolean
    assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'b'!");
    Type = Context.BoolTy;
    break;
  case 'z':  // size_t.
    assert(HowLong == 0 && !Signed && !Unsigned && "Bad modifiers for 'z'!");
    Type = Context.getSizeType();
    break;
  case 'F':
    Type = Context.getCFConstantStringType();
    break;
  case 'a':
    Type = Context.getBuiltinVaListType();
    assert(!Type.isNull() && "builtin va list type not initialized!");
    break;
  case 'A':
    // This is a "reference" to a va_list; however, what exactly
    // this means depends on how va_list is defined. There are two
    // different kinds of va_list: ones passed by value, and ones
    // passed by reference.  An example of a by-value va_list is
//.........这里部分代码省略.........