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.codegen.context;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.kotlin.codegen.AccessorForPropertyDescriptor;
022    import org.jetbrains.kotlin.codegen.OwnerKind;
023    import org.jetbrains.kotlin.codegen.binding.MutableClosure;
024    import org.jetbrains.kotlin.codegen.state.JetTypeMapper;
025    import org.jetbrains.kotlin.descriptors.ClassDescriptor;
026    import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
027    import org.jetbrains.kotlin.descriptors.PropertyDescriptor;
028    import org.jetbrains.kotlin.resolve.jvm.annotations.AnnotationUtilKt;
029    
030    import java.util.HashMap;
031    import java.util.Map;
032    
033    public abstract class FieldOwnerContext<T extends DeclarationDescriptor> extends CodegenContext<T> {
034        //default property name -> map<property descriptor -> bytecode name>
035        private final Map<String, Map<PropertyDescriptor, String>> fieldNames = new HashMap<String, Map<PropertyDescriptor, String>>();
036    
037        public FieldOwnerContext(
038                @NotNull T contextDescriptor,
039                @NotNull OwnerKind contextKind,
040                @Nullable CodegenContext parentContext,
041                @Nullable MutableClosure closure,
042                @Nullable ClassDescriptor thisDescriptor,
043                @Nullable LocalLookup expressionCodegen
044        ) {
045            super(contextDescriptor, contextKind, parentContext, closure, thisDescriptor, expressionCodegen);
046        }
047    
048        @NotNull
049        public String getFieldName(@NotNull PropertyDescriptor possiblySubstitutedDescriptor, boolean isDelegated) {
050            if (possiblySubstitutedDescriptor instanceof AccessorForPropertyDescriptor) {
051                possiblySubstitutedDescriptor = ((AccessorForPropertyDescriptor) possiblySubstitutedDescriptor).getCalleeDescriptor();
052            }
053    
054            PropertyDescriptor descriptor = possiblySubstitutedDescriptor.getOriginal();
055            assert descriptor.getKind().isReal() : "Only declared properties can have backing fields: " + descriptor;
056    
057            String defaultPropertyName = JetTypeMapper.mapDefaultFieldName(descriptor, isDelegated);
058    
059            Map<PropertyDescriptor, String> descriptor2Name = fieldNames.get(defaultPropertyName);
060            if (descriptor2Name == null) {
061                descriptor2Name = new HashMap<PropertyDescriptor, String>();
062                fieldNames.put(defaultPropertyName, descriptor2Name);
063            }
064    
065            String actualName = descriptor2Name.get(descriptor);
066            if (actualName != null) return actualName;
067    
068            String newName = descriptor2Name.isEmpty() || AnnotationUtilKt.hasJvmFieldAnnotation(descriptor)
069                             ? defaultPropertyName
070                             : defaultPropertyName + "$" + descriptor2Name.size();
071            descriptor2Name.put(descriptor, newName);
072            return newName;
073        }
074    }