001    /*
002     * Copyright 2010-2013 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.jet.codegen.context;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.annotations.Nullable;
021    import org.jetbrains.jet.codegen.OwnerKind;
022    import org.jetbrains.jet.codegen.binding.MutableClosure;
023    import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
024    import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
025    import org.jetbrains.jet.lang.descriptors.PropertyDescriptor;
026    import org.jetbrains.jet.lang.resolve.java.JvmAbi;
027    
028    import java.util.HashMap;
029    import java.util.Map;
030    
031    public abstract class FieldOwnerContext<T extends DeclarationDescriptor> extends CodegenContext<T> {
032        //default property name -> map<property descriptor -> bytecode name>
033        private final Map<String, Map<PropertyDescriptor, String>> fieldNames = new HashMap<String, Map<PropertyDescriptor, String>>();
034    
035        public FieldOwnerContext(
036                @NotNull T contextDescriptor,
037                @NotNull OwnerKind contextKind,
038                @Nullable CodegenContext parentContext,
039                @Nullable MutableClosure closure,
040                @Nullable ClassDescriptor thisDescriptor,
041                @Nullable LocalLookup expressionCodegen
042        ) {
043            super(contextDescriptor, contextKind, parentContext, closure, thisDescriptor, expressionCodegen);
044        }
045    
046        @NotNull
047        public String getFieldName(@NotNull PropertyDescriptor possiblySubstitutedDescriptor, boolean isDelegated) {
048            PropertyDescriptor descriptor = possiblySubstitutedDescriptor.getOriginal();
049            assert descriptor.getKind().isReal() : "Only declared properties can have backing fields: " + descriptor;
050    
051            String defaultPropertyName = JvmAbi.getDefaultFieldNameForProperty(descriptor.getName(), isDelegated);
052    
053            Map<PropertyDescriptor, String> descriptor2Name = fieldNames.get(defaultPropertyName);
054            if (descriptor2Name == null) {
055                descriptor2Name = new HashMap<PropertyDescriptor, String>();
056                fieldNames.put(defaultPropertyName, descriptor2Name);
057            }
058    
059            String actualName = descriptor2Name.get(descriptor);
060            if (actualName != null) return actualName;
061    
062            String newName = descriptor2Name.isEmpty() ? defaultPropertyName : defaultPropertyName + "$" + descriptor2Name.size();
063            descriptor2Name.put(descriptor, newName);
064            return newName;
065        }
066    }