C++ ASTContext::getPromotedIntegerType方法代码示例

QualType ArgTypeResult::getRepresentativeType(ASTContext &C) const {
  switch (K) {
    case InvalidTy:
      assert(false && "No representative type for Invalid ArgTypeResult");
      // Fall-through.
    case UnknownTy:
      return QualType();
    case SpecificTy:
      return T;
    case CStrTy:
      return C.getPointerType(C.CharTy);
    case WCStrTy:
      return C.getPointerType(C.getWCharType());
    case ObjCPointerTy:
      return C.ObjCBuiltinIdTy;
    case CPointerTy:
      return C.VoidPtrTy;
    case WIntTy: {
      QualType WC = C.getWCharType();
      return WC->isPromotableIntegerType() ? C.getPromotedIntegerType(WC) : WC;
    }
  }

  // FIXME: Should be unreachable, but Clang is currently emitting
  // a warning.
  return QualType();
}

//.........这里部分代码省略.........
            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!");
}

bool ArgTypeResult::matchesType(ASTContext &C, QualType argTy) const {
  switch (K) {
    case InvalidTy:
      assert(false && "ArgTypeResult must be valid");
      return true;

    case UnknownTy:
      return true;

    case SpecificTy: {
      argTy = C.getCanonicalType(argTy).getUnqualifiedType();
      if (T == argTy)
        return true;
      // Check for "compatible types".
      if (const BuiltinType *BT = argTy->getAs<BuiltinType>())
        switch (BT->getKind()) {
          default:
            break;
          case BuiltinType::Char_S:
          case BuiltinType::SChar:
            return T == C.UnsignedCharTy;
          case BuiltinType::Char_U:
          case BuiltinType::UChar:                    
            return T == C.SignedCharTy;
          case BuiltinType::Short:
            return T == C.UnsignedShortTy;
          case BuiltinType::UShort:
            return T == C.ShortTy;
          case BuiltinType::Int:
            return T == C.UnsignedIntTy;
          case BuiltinType::UInt:
            return T == C.IntTy;
          case BuiltinType::Long:
            return T == C.UnsignedLongTy;
          case BuiltinType::ULong:
            return T == C.LongTy;
          case BuiltinType::LongLong:
            return T == C.UnsignedLongLongTy;
          case BuiltinType::ULongLong:
            return T == C.LongLongTy;
        }
      return false;
    }

    case CStrTy: {
      const PointerType *PT = argTy->getAs<PointerType>();
      if (!PT)
        return false;
      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 true;
          default:
            break;
        }

      return false;
    }

    case WCStrTy: {
      const PointerType *PT = argTy->getAs<PointerType>();
      if (!PT)
        return false;
      QualType pointeeTy =
        C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
      return pointeeTy == C.getWCharType();
    }
    
    case WIntTy: {
      // Instead of doing a lookup for the definition of 'wint_t' (which
      // is defined by the system headers) instead see if wchar_t and
      // the argument type promote to the same type.
      QualType PromoWChar =
        C.getWCharType()->isPromotableIntegerType() 
          ? C.getPromotedIntegerType(C.getWCharType()) : C.getWCharType();
      QualType PromoArg = 
        argTy->isPromotableIntegerType()
          ? C.getPromotedIntegerType(argTy) : argTy;
      
      PromoWChar = C.getCanonicalType(PromoWChar).getUnqualifiedType();
      PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();
      
      return PromoWChar == PromoArg;
    }

    case CPointerTy:
      return argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
        argTy->isNullPtrType();

    case ObjCPointerTy:
      return argTy->getAs<ObjCObjectPointerType>() != NULL;
  }

  // FIXME: Should be unreachable, but Clang is currently emitting
  // a warning.
//.........这里部分代码省略.........