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.intrinsics;
018    
019    import com.intellij.psi.PsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.kotlin.codegen.ExpressionCodegen;
022    import org.jetbrains.kotlin.codegen.StackValue;
023    import org.jetbrains.kotlin.lexer.JetTokens;
024    import org.jetbrains.kotlin.psi.JetBinaryExpression;
025    import org.jetbrains.kotlin.psi.JetCallExpression;
026    import org.jetbrains.kotlin.psi.JetExpression;
027    import org.jetbrains.org.objectweb.asm.Type;
028    
029    import java.util.List;
030    
031    import static org.jetbrains.kotlin.resolve.jvm.AsmTypes.OBJECT_TYPE;
032    
033    public class IdentityEquals extends LazyIntrinsicMethod {
034        @NotNull
035        @Override
036        public StackValue generateImpl(
037                @NotNull ExpressionCodegen codegen,
038                @NotNull Type returnType,
039                PsiElement element,
040                @NotNull List<JetExpression> arguments,
041                @NotNull StackValue receiver
042        ) {
043            StackValue left;
044            StackValue right;
045            if (element instanceof JetCallExpression) {
046                left = receiver;
047                right = codegen.gen(arguments.get(0));
048            }
049            else {
050                assert element instanceof JetBinaryExpression;
051                JetBinaryExpression e = (JetBinaryExpression) element;
052                left = codegen.gen(e.getLeft());
053                right = codegen.gen(e.getRight());
054            }
055            return StackValue.cmp(JetTokens.EQEQEQ, OBJECT_TYPE, left, right);
056        }
057    }