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 org.jetbrains.annotations.NotNull;
021    import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
022    import org.jetbrains.kotlin.descriptors.*;
023    import org.jetbrains.kotlin.diagnostics.Errors;
024    import org.jetbrains.kotlin.name.FqName;
025    import org.jetbrains.kotlin.psi.KtExpression;
026    import org.jetbrains.kotlin.resolve.calls.context.BasicCallResolutionContext;
027    import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall;
028    import org.jetbrains.kotlin.types.KotlinType;
029    import org.jetbrains.kotlin.types.typeUtil.TypeUtilsKt;
030    
031    import java.util.Map;
032    
033    public class ReifiedTypeParameterSubstitutionChecker implements CallChecker {
034        @Override
035        public <F extends CallableDescriptor> void check(
036                @NotNull ResolvedCall<F> resolvedCall, @NotNull BasicCallResolutionContext context
037        ) {
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                if (argumentDeclarationDescriptor instanceof TypeParameterDescriptor &&
049                    !((TypeParameterDescriptor) argumentDeclarationDescriptor).isReified()) {
050                    context.trace.report(
051                            Errors.TYPE_PARAMETER_AS_REIFIED.on(getElementToReport(context, parameter.getIndex()), parameter)
052                    );
053                }
054                else if (TypeUtilsKt.cannotBeReified(argument)) {
055                    context.trace.report(
056                            Errors.REIFIED_TYPE_FORBIDDEN_SUBSTITUTION.on(getElementToReport(context, parameter.getIndex()), 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.trace.report(
061                //            Errors.REIFIED_TYPE_UNSAFE_SUBSTITUTION.on(getElementToReport(context, parameter.getIndex()), argument));
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        private static boolean isTypeParameterOfKotlinArray(@NotNull TypeParameterDescriptor parameter) {
074            DeclarationDescriptor container = parameter.getContainingDeclaration();
075            return container instanceof ClassDescriptor && KotlinBuiltIns.isNonPrimitiveArray((ClassDescriptor) container);
076        }
077    
078        @NotNull
079        private static PsiElement getElementToReport(@NotNull BasicCallResolutionContext context, int parameterIndex) {
080            if (context.call.getTypeArguments().size() > parameterIndex) {
081                return context.call.getTypeArguments().get(parameterIndex);
082            }
083            KtExpression callee = context.call.getCalleeExpression();
084            return callee != null ? callee : context.call.getCallElement();
085        }
086    }