Example #1
0
 private static boolean areTypesEquivalent(
     @NotNull JetType typeInSuper,
     @NotNull JetType typeInSub,
     @NotNull JetTypeChecker.TypeConstructorEquality axioms) {
   boolean bothErrors = typeInSuper.isError() && typeInSub.isError();
   if (!bothErrors && !JetTypeChecker.withAxioms(axioms).equalTypes(typeInSuper, typeInSub)) {
     return false;
   }
   return true;
 }
Example #2
0
  @NotNull
  private OverrideCompatibilityInfo isOverridableBy(
      @NotNull CallableDescriptor superDescriptor,
      @NotNull CallableDescriptor subDescriptor,
      boolean checkReturnType) {
    if (superDescriptor instanceof FunctionDescriptor) {
      if (!(subDescriptor instanceof FunctionDescriptor))
        return OverrideCompatibilityInfo.memberKindMismatch();
    } else if (superDescriptor instanceof PropertyDescriptor) {
      if (!(subDescriptor instanceof PropertyDescriptor))
        return OverrideCompatibilityInfo.memberKindMismatch();
    } else {
      throw new IllegalArgumentException(
          "This type of CallableDescriptor cannot be checked for overridability: "
              + superDescriptor);
    }

    // TODO: check outside of this method
    if (!superDescriptor.getName().equals(subDescriptor.getName())) {
      return OverrideCompatibilityInfo.nameMismatch();
    }

    OverrideCompatibilityInfo receiverAndParameterResult =
        checkReceiverAndParameterCount(superDescriptor, subDescriptor);
    if (receiverAndParameterResult != null) {
      return receiverAndParameterResult;
    }

    List<JetType> superValueParameters = compiledValueParameters(superDescriptor);
    List<JetType> subValueParameters = compiledValueParameters(subDescriptor);

    List<TypeParameterDescriptor> superTypeParameters = superDescriptor.getTypeParameters();
    List<TypeParameterDescriptor> subTypeParameters = subDescriptor.getTypeParameters();

    if (superTypeParameters.size() != subTypeParameters.size()) {
      for (int i = 0; i < superValueParameters.size(); ++i) {
        JetType superValueParameterType = getUpperBound(superValueParameters.get(i));
        JetType subValueParameterType = getUpperBound(subValueParameters.get(i));
        // TODO: compare erasure
        if (!JetTypeChecker.DEFAULT.equalTypes(superValueParameterType, subValueParameterType)) {
          return OverrideCompatibilityInfo.typeParameterNumberMismatch();
        }
      }
      return OverrideCompatibilityInfo.valueParameterTypeMismatch(
          null, null, OverrideCompatibilityInfo.Result.CONFLICT);
    }

    final Map<TypeConstructor, TypeConstructor> matchingTypeConstructors =
        new HashMap<TypeConstructor, TypeConstructor>();
    for (int i = 0, typeParametersSize = superTypeParameters.size(); i < typeParametersSize; i++) {
      TypeParameterDescriptor superTypeParameter = superTypeParameters.get(i);
      TypeParameterDescriptor subTypeParameter = subTypeParameters.get(i);
      matchingTypeConstructors.put(
          superTypeParameter.getTypeConstructor(), subTypeParameter.getTypeConstructor());
    }

    JetTypeChecker.TypeConstructorEquality localEqualityAxioms =
        new JetTypeChecker.TypeConstructorEquality() {
          @Override
          public boolean equals(@NotNull TypeConstructor a, @NotNull TypeConstructor b) {
            if (equalityAxioms.equals(a, b)) return true;
            TypeConstructor img1 = matchingTypeConstructors.get(a);
            TypeConstructor img2 = matchingTypeConstructors.get(b);
            if (!(img1 != null && img1.equals(b)) && !(img2 != null && img2.equals(a))) {
              return false;
            }
            return true;
          }
        };

    for (int i = 0, typeParametersSize = superTypeParameters.size(); i < typeParametersSize; i++) {
      TypeParameterDescriptor superTypeParameter = superTypeParameters.get(i);
      TypeParameterDescriptor subTypeParameter = subTypeParameters.get(i);

      if (!areTypesEquivalent(
          superTypeParameter.getUpperBoundsAsType(),
          subTypeParameter.getUpperBoundsAsType(),
          localEqualityAxioms)) {
        return OverrideCompatibilityInfo.boundsMismatch(superTypeParameter, subTypeParameter);
      }
    }

    for (int i = 0, unsubstitutedValueParametersSize = superValueParameters.size();
        i < unsubstitutedValueParametersSize;
        i++) {
      JetType superValueParameter = superValueParameters.get(i);
      JetType subValueParameter = subValueParameters.get(i);

      if (!areTypesEquivalent(superValueParameter, subValueParameter, localEqualityAxioms)) {
        return OverrideCompatibilityInfo.valueParameterTypeMismatch(
            superValueParameter, subValueParameter, INCOMPATIBLE);
      }
    }

    if (checkReturnType) {
      JetType superReturnType = superDescriptor.getReturnType();
      JetType subReturnType = subDescriptor.getReturnType();

      if (superReturnType != null && subReturnType != null) {
        boolean bothErrors = subReturnType.isError() && superReturnType.isError();
        if (!bothErrors
            && !JetTypeChecker.withAxioms(localEqualityAxioms)
                .isSubtypeOf(subReturnType, superReturnType)) {
          return OverrideCompatibilityInfo.returnTypeMismatch(superReturnType, subReturnType);
        }
      }
    }

    for (ExternalOverridabilityCondition externalCondition : EXTERNAL_CONDITIONS) {
      if (!externalCondition.isOverridable(superDescriptor, subDescriptor)) {
        return OverrideCompatibilityInfo.externalConditionFailed(externalCondition.getClass());
      }
    }

    return OverrideCompatibilityInfo.success();
  }