001    /*
002     * Copyright 2010-2015 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.kotlin.resolve.calls.checkers;
018    
019    import com.intellij.psi.PsiElement;
020    import kotlin.collections.CollectionsKt;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
023    import org.jetbrains.kotlin.descriptors.ClassDescriptor;
024    import org.jetbrains.kotlin.descriptors.ClassifierDescriptor;
025    import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
026    import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor;
027    import org.jetbrains.kotlin.diagnostics.Errors;
028    import org.jetbrains.kotlin.psi.KtTypeProjection;
029    import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
030    import org.jetbrains.kotlin.types.KotlinType;
031    import org.jetbrains.kotlin.types.typeUtil.TypeUtilsKt;
032    
033    import java.util.Map;
034    
035    public class ReifiedTypeParameterSubstitutionChecker implements CallChecker {
036        @Override
037        public void check(@NotNull ResolvedCall<?> resolvedCall, @NotNull PsiElement reportOn, @NotNull CallCheckerContext context) {
038            Map<TypeParameterDescriptor, KotlinType> typeArguments = resolvedCall.getTypeArguments();
039            for (Map.Entry<TypeParameterDescriptor, KotlinType> entry : typeArguments.entrySet()) {
040                TypeParameterDescriptor parameter = entry.getKey();
041                KotlinType argument = entry.getValue();
042                ClassifierDescriptor argumentDeclarationDescriptor = argument.getConstructor().getDeclarationDescriptor();
043    
044                if (!parameter.isReified() && !isTypeParameterOfKotlinArray(parameter)) {
045                    continue;
046                }
047    
048                KtTypeProjection typeProjection = CollectionsKt.getOrNull(resolvedCall.getCall().getTypeArguments(), parameter.getIndex());
049                PsiElement reportErrorOn = typeProjection != null ? typeProjection : reportOn;
050    
051                if (argumentDeclarationDescriptor instanceof TypeParameterDescriptor &&
052                    !((TypeParameterDescriptor) argumentDeclarationDescriptor).isReified()) {
053                    context.getTrace().report(Errors.TYPE_PARAMETER_AS_REIFIED.on(reportErrorOn, (TypeParameterDescriptor) argumentDeclarationDescriptor));
054                }
055                else if (TypeUtilsKt.cannotBeReified(argument)) {
056                    context.getTrace().report(Errors.REIFIED_TYPE_FORBIDDEN_SUBSTITUTION.on(reportErrorOn, argument));
057                }
058                // REIFIED_TYPE_UNSAFE_SUBSTITUTION is temporary disabled because it seems too strict now (see KT-10847)
059                //else if (TypeUtilsKt.unsafeAsReifiedArgument(argument) && !hasPureReifiableAnnotation(parameter)) {
060                //    context.getTrace().report(Errors.REIFIED_TYPE_UNSAFE_SUBSTITUTION.on(reportErrorOn, argument));
061                //}
062            }
063        }
064    
065        /*
066        private static final FqName PURE_REIFIABLE_ANNOTATION_FQ_NAME = new FqName("kotlin.internal.PureReifiable");
067    
068        private static boolean hasPureReifiableAnnotation(@NotNull TypeParameterDescriptor parameter) {
069            return parameter.getAnnotations().hasAnnotation(PURE_REIFIABLE_ANNOTATION_FQ_NAME) ||
070                   isTypeParameterOfKotlinArray(parameter);
071        }
072        */
073    
074        private static boolean isTypeParameterOfKotlinArray(@NotNull TypeParameterDescriptor parameter) {
075            DeclarationDescriptor container = parameter.getContainingDeclaration();
076            return container instanceof ClassDescriptor && KotlinBuiltIns.isNonPrimitiveArray((ClassDescriptor) container);
077        }
078    }