@NotNull
private VarargCheckResult checkVarargInSuperFunctions(
@NotNull ValueParameterDescriptor originalParam) {
boolean someSupersVararg = false;
boolean someSupersNotVararg = false;
for (FunctionDescriptor superFunction : superFunctions) {
if (superFunction.getValueParameters().get(originalParam.getIndex()).getVarargElementType()
!= null) {
someSupersVararg = true;
} else {
someSupersNotVararg = true;
}
}
JetType originalVarargElementType = originalParam.getVarargElementType();
JetType originalType = originalParam.getType();
if (someSupersVararg && someSupersNotVararg) {
reportError("Incompatible super methods: some have vararg parameter, some have not");
return new VarargCheckResult(originalType, originalVarargElementType != null);
}
KotlinBuiltIns builtIns = KotlinBuiltIns.getInstance();
if (someSupersVararg && originalVarargElementType == null) {
// convert to vararg
assert isArrayType(originalType);
if (builtIns.isPrimitiveArray(originalType)) {
// replace IntArray? with IntArray
return new VarargCheckResult(TypeUtils.makeNotNullable(originalType), true);
}
// replace Array<out Foo>? with Array<Foo>
JetType varargElementType = builtIns.getArrayElementType(originalType);
return new VarargCheckResult(builtIns.getArrayType(INVARIANT, varargElementType), true);
} else if (someSupersNotVararg && originalVarargElementType != null) {
// convert to non-vararg
assert isArrayType(originalType);
if (builtIns.isPrimitiveArray(originalType)) {
// replace IntArray with IntArray?
return new VarargCheckResult(TypeUtils.makeNullable(originalType), false);
}
// replace Array<Foo> with Array<out Foo>?
return new VarargCheckResult(
TypeUtils.makeNullable(
builtIns.getArrayType(Variance.OUT_VARIANCE, originalVarargElementType)),
false);
}
return new VarargCheckResult(originalType, originalVarargElementType != null);
}
@NotNull
public KotlinType getArrayElementType(@NotNull KotlinType arrayType) {
if (isArray(arrayType)) {
if (arrayType.getArguments().size() != 1) {
throw new IllegalStateException();
}
return arrayType.getArguments().get(0).getType();
}
KotlinType primitiveType =
kotlinArrayTypeToPrimitiveKotlinType.get(TypeUtils.makeNotNullable(arrayType));
if (primitiveType == null) {
throw new IllegalStateException("not array: " + arrayType);
}
return primitiveType;
}
private void addConstraint(
@NotNull ConstraintKind constraintKind,
@NotNull JetType subjectType,
@Nullable JetType constrainingType,
@NotNull ConstraintPosition constraintPosition) {
if (constrainingType == TypeUtils.NO_EXPECTED_TYPE
|| constrainingType == DONT_CARE
|| constrainingType == CANT_INFER) {
return;
}
if (constrainingType == null
|| (ErrorUtils.isErrorType(constrainingType)
&& constrainingType != PLACEHOLDER_FUNCTION_TYPE)) {
hasErrorInConstrainingTypes = true;
return;
}
assert subjectType != TypeUtils.NO_EXPECTED_TYPE
: "Subject type shouldn't be NO_EXPECTED_TYPE (in position " + constraintPosition + " )";
if (ErrorUtils.isErrorType(subjectType)) return;
DeclarationDescriptor subjectTypeDescriptor =
subjectType.getConstructor().getDeclarationDescriptor();
KotlinBuiltIns kotlinBuiltIns = KotlinBuiltIns.getInstance();
if (constrainingType == PLACEHOLDER_FUNCTION_TYPE) {
if (!kotlinBuiltIns.isFunctionOrExtensionFunctionType(subjectType)) {
if (subjectTypeDescriptor instanceof TypeParameterDescriptor
&& typeParameterConstraints.get(subjectTypeDescriptor) != null) {
// a constraint binds type parameter and any function type, so there is no new info and no
// error
return;
}
errorConstraintPositions.add(constraintPosition);
}
return;
}
// todo temporary hack
// function literal without declaring receiver type { x -> ... }
// can be considered as extension function if one is expected
// (special type constructor for function/ extension function should be introduced like
// PLACEHOLDER_FUNCTION_TYPE)
if (constraintKind == SUB_TYPE
&& kotlinBuiltIns.isFunctionType(constrainingType)
&& kotlinBuiltIns.isExtensionFunctionType(subjectType)) {
constrainingType = createCorrespondingExtensionFunctionType(constrainingType, DONT_CARE);
}
DeclarationDescriptor constrainingTypeDescriptor =
constrainingType.getConstructor().getDeclarationDescriptor();
if (subjectTypeDescriptor instanceof TypeParameterDescriptor) {
TypeParameterDescriptor typeParameter = (TypeParameterDescriptor) subjectTypeDescriptor;
TypeConstraintsImpl typeConstraints = typeParameterConstraints.get(typeParameter);
if (typeConstraints != null) {
if (TypeUtils.dependsOnTypeParameterConstructors(
constrainingType, Collections.singleton(DONT_CARE.getConstructor()))) {
return;
}
if (subjectType.isNullable() && constrainingType.isNullable()) {
constrainingType = TypeUtils.makeNotNullable(constrainingType);
}
typeConstraints.addBound(constraintKind, constrainingType);
return;
}
}
if (constrainingTypeDescriptor instanceof TypeParameterDescriptor) {
assert typeParameterConstraints.get(constrainingTypeDescriptor) == null
: "Constraining type contains type variable " + constrainingTypeDescriptor.getName();
}
if (constraintKind == SUB_TYPE && kotlinBuiltIns.isNothingOrNullableNothing(constrainingType)) {
// following constraints are always true:
// 'Nothing' is a subtype of any type
if (!constrainingType.isNullable()) return;
// 'Nothing?' is a subtype of nullable type
if (subjectType.isNullable()) return;
}
if (!(constrainingTypeDescriptor instanceof ClassDescriptor)
|| !(subjectTypeDescriptor instanceof ClassDescriptor)) {
errorConstraintPositions.add(constraintPosition);
return;
}
switch (constraintKind) {
case SUB_TYPE:
{
if (kotlinBuiltIns.isNothingOrNullableNothing(constrainingType)) break;
JetType correspondingSupertype =
TypeCheckingProcedure.findCorrespondingSupertype(constrainingType, subjectType);
if (correspondingSupertype != null) {
constrainingType = correspondingSupertype;
}
break;
}
case SUPER_TYPE:
{
if (kotlinBuiltIns.isNothingOrNullableNothing(subjectType)) break;
JetType correspondingSupertype =
TypeCheckingProcedure.findCorrespondingSupertype(subjectType, constrainingType);
if (correspondingSupertype != null) {
subjectType = correspondingSupertype;
}
}
case EQUAL: // nothing
}
if (constrainingType.getConstructor() != subjectType.getConstructor()) {
errorConstraintPositions.add(constraintPosition);
return;
}
TypeConstructor typeConstructor = subjectType.getConstructor();
List<TypeProjection> subjectArguments = subjectType.getArguments();
List<TypeProjection> constrainingArguments = constrainingType.getArguments();
List<TypeParameterDescriptor> parameters = typeConstructor.getParameters();
for (int i = 0; i < subjectArguments.size(); i++) {
Variance typeParameterVariance = parameters.get(i).getVariance();
TypeProjection subjectArgument = subjectArguments.get(i);
TypeProjection constrainingArgument = constrainingArguments.get(i);
ConstraintKind typeParameterConstraintKind =
getTypeParameterConstraintKind(
typeParameterVariance, subjectArgument, constrainingArgument, constraintKind);
addConstraint(
typeParameterConstraintKind,
subjectArgument.getType(),
constrainingArgument.getType(),
constraintPosition);
}
}