@Nullable
public static OverrideCompatibilityInfo getBasicOverridabilityProblem(
@NotNull CallableDescriptor superDescriptor, @NotNull CallableDescriptor subDescriptor) {
if (superDescriptor instanceof FunctionDescriptor
&& !(subDescriptor instanceof FunctionDescriptor)
|| superDescriptor instanceof PropertyDescriptor
&& !(subDescriptor instanceof PropertyDescriptor)) {
return OverrideCompatibilityInfo.incompatible("Member kind mismatch");
}
if (!(superDescriptor instanceof FunctionDescriptor)
&& !(superDescriptor instanceof PropertyDescriptor)) {
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.incompatible("Name mismatch");
}
OverrideCompatibilityInfo receiverAndParameterResult =
checkReceiverAndParameterCount(superDescriptor, subDescriptor);
if (receiverAndParameterResult != null) {
return receiverAndParameterResult;
}
return null;
}
@NotNull
public OverrideCompatibilityInfo isOverridableByWithoutExternalConditions(
@NotNull CallableDescriptor superDescriptor,
@NotNull CallableDescriptor subDescriptor,
boolean checkReturnType) {
OverrideCompatibilityInfo basicOverridability =
getBasicOverridabilityProblem(superDescriptor, subDescriptor);
if (basicOverridability != null) return basicOverridability;
List<KotlinType> superValueParameters = compiledValueParameters(superDescriptor);
List<KotlinType> 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) {
// TODO: compare erasure
if (!KotlinTypeChecker.DEFAULT.equalTypes(
superValueParameters.get(i), subValueParameters.get(i))) {
return OverrideCompatibilityInfo.incompatible("Type parameter number mismatch");
}
}
return OverrideCompatibilityInfo.conflict("Type parameter number mismatch");
}
KotlinTypeChecker typeChecker = createTypeChecker(superTypeParameters, subTypeParameters);
for (int i = 0; i < superTypeParameters.size(); i++) {
if (!areTypeParametersEquivalent(
superTypeParameters.get(i), subTypeParameters.get(i), typeChecker)) {
return OverrideCompatibilityInfo.incompatible("Type parameter bounds mismatch");
}
}
for (int i = 0; i < superValueParameters.size(); i++) {
if (!areTypesEquivalent(
superValueParameters.get(i), subValueParameters.get(i), typeChecker)) {
return OverrideCompatibilityInfo.incompatible("Value parameter type mismatch");
}
}
if (checkReturnType) {
KotlinType superReturnType = superDescriptor.getReturnType();
KotlinType subReturnType = subDescriptor.getReturnType();
if (superReturnType != null && subReturnType != null) {
boolean bothErrors = subReturnType.isError() && superReturnType.isError();
if (!bothErrors && !typeChecker.isSubtypeOf(subReturnType, superReturnType)) {
return OverrideCompatibilityInfo.conflict("Return type mismatch");
}
}
}
return OverrideCompatibilityInfo.success();
}
@Nullable
static OverrideCompatibilityInfo checkReceiverAndParameterCount(
CallableDescriptor superDescriptor, CallableDescriptor subDescriptor) {
if ((superDescriptor.getExtensionReceiverParameter() == null)
!= (subDescriptor.getExtensionReceiverParameter() == null)) {
return OverrideCompatibilityInfo.incompatible("Receiver presence mismatch");
}
if (superDescriptor.getValueParameters().size() != subDescriptor.getValueParameters().size()) {
return OverrideCompatibilityInfo.incompatible("Value parameter number mismatch");
}
return null;
}
@NotNull
private OverrideCompatibilityInfo isOverridableBy(
@NotNull CallableDescriptor superDescriptor,
@NotNull CallableDescriptor subDescriptor,
boolean checkReturnType) {
for (ExternalOverridabilityCondition externalCondition : EXTERNAL_CONDITIONS) {
ExternalOverridabilityCondition.Result result =
externalCondition.isOverridable(superDescriptor, subDescriptor);
switch (result) {
case OVERRIDABLE:
return OverrideCompatibilityInfo.success();
case CONFLICT:
return OverrideCompatibilityInfo.conflict("External condition failed");
case INCOMPATIBLE:
return OverrideCompatibilityInfo.incompatible("External condition");
case UNKNOWN:
// do nothing
// go to the next external condition or default override check
}
}
return isOverridableByWithoutExternalConditions(
superDescriptor, subDescriptor, checkReturnType);
}
@NotNull
public OverrideCompatibilityInfo isOverridableByWithoutExternalConditions(
@NotNull CallableDescriptor superDescriptor,
@NotNull CallableDescriptor subDescriptor,
boolean checkReturnType) {
if (superDescriptor instanceof FunctionDescriptor
&& !(subDescriptor instanceof FunctionDescriptor)
|| superDescriptor instanceof PropertyDescriptor
&& !(subDescriptor instanceof PropertyDescriptor)) {
return OverrideCompatibilityInfo.incompatible("Member kind mismatch");
}
if (!(superDescriptor instanceof FunctionDescriptor)
&& !(superDescriptor instanceof PropertyDescriptor)) {
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.incompatible("Name mismatch");
}
OverrideCompatibilityInfo receiverAndParameterResult =
checkReceiverAndParameterCount(superDescriptor, subDescriptor);
if (receiverAndParameterResult != null) {
return receiverAndParameterResult;
}
List<KotlinType> superValueParameters = compiledValueParameters(superDescriptor);
List<KotlinType> 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) {
// TODO: compare erasure
if (!KotlinTypeChecker.DEFAULT.equalTypes(
superValueParameters.get(i), subValueParameters.get(i))) {
return OverrideCompatibilityInfo.incompatible("Type parameter number mismatch");
}
}
return OverrideCompatibilityInfo.conflict("Type parameter number mismatch");
}
KotlinTypeChecker typeChecker = createTypeChecker(superTypeParameters, subTypeParameters);
for (int i = 0; i < superTypeParameters.size(); i++) {
if (!areTypeParametersEquivalent(
superTypeParameters.get(i), subTypeParameters.get(i), typeChecker)) {
return OverrideCompatibilityInfo.incompatible("Type parameter bounds mismatch");
}
}
for (int i = 0; i < superValueParameters.size(); i++) {
if (!areTypesEquivalent(
superValueParameters.get(i), subValueParameters.get(i), typeChecker)) {
return OverrideCompatibilityInfo.incompatible("Value parameter type mismatch");
}
}
if (checkReturnType) {
KotlinType superReturnType = superDescriptor.getReturnType();
KotlinType subReturnType = subDescriptor.getReturnType();
if (superReturnType != null && subReturnType != null) {
boolean bothErrors = subReturnType.isError() && superReturnType.isError();
if (!bothErrors && !typeChecker.isSubtypeOf(subReturnType, superReturnType)) {
return OverrideCompatibilityInfo.conflict("Return type mismatch");
}
}
}
return OverrideCompatibilityInfo.success();
}
@NotNull
public OverrideCompatibilityInfo isOverridableBy(
@NotNull CallableDescriptor superDescriptor,
@NotNull CallableDescriptor subDescriptor,
@Nullable ClassDescriptor subClassDescriptor,
boolean checkReturnType) {
OverrideCompatibilityInfo basicResult =
isOverridableByWithoutExternalConditions(superDescriptor, subDescriptor, checkReturnType);
boolean wasSuccess = basicResult.getResult() == OVERRIDABLE;
for (ExternalOverridabilityCondition externalCondition : EXTERNAL_CONDITIONS) {
// Do not run CONFLICTS_ONLY while there was no success
if (externalCondition.getContract()
== ExternalOverridabilityCondition.Contract.CONFLICTS_ONLY) continue;
if (wasSuccess
&& externalCondition.getContract()
== ExternalOverridabilityCondition.Contract.SUCCESS_ONLY) continue;
ExternalOverridabilityCondition.Result result =
externalCondition.isOverridable(superDescriptor, subDescriptor, subClassDescriptor);
switch (result) {
case OVERRIDABLE:
wasSuccess = true;
break;
case CONFLICT:
return OverrideCompatibilityInfo.conflict("External condition failed");
case INCOMPATIBLE:
return OverrideCompatibilityInfo.incompatible("External condition");
case UNKNOWN:
// do nothing
// go to the next external condition or default override check
}
}
if (!wasSuccess) {
return basicResult;
}
// Search for conflicts from external conditions
for (ExternalOverridabilityCondition externalCondition : EXTERNAL_CONDITIONS) {
// Run all conditions that was not run before (i.e. CONFLICTS_ONLY)
if (externalCondition.getContract()
!= ExternalOverridabilityCondition.Contract.CONFLICTS_ONLY) continue;
ExternalOverridabilityCondition.Result result =
externalCondition.isOverridable(superDescriptor, subDescriptor, subClassDescriptor);
switch (result) {
case CONFLICT:
return OverrideCompatibilityInfo.conflict("External condition failed");
case INCOMPATIBLE:
return OverrideCompatibilityInfo.incompatible("External condition");
case OVERRIDABLE:
throw new IllegalStateException(
"Contract violation in "
+ externalCondition.getClass().getName()
+ " condition. It's not supposed to end with success");
case UNKNOWN:
// do nothing
// go to the next external condition or default override check
}
}
return OverrideCompatibilityInfo.success();
}