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.intrinsics;
018    
019    import com.intellij.psi.PsiElement;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.org.objectweb.asm.Type;
022    import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter;
023    import org.jetbrains.jet.codegen.ExpressionCodegen;
024    import org.jetbrains.jet.codegen.StackValue;
025    import org.jetbrains.jet.lang.psi.JetBinaryExpression;
026    import org.jetbrains.jet.lang.psi.JetCallExpression;
027    import org.jetbrains.jet.lang.psi.JetExpression;
028    import org.jetbrains.jet.lexer.JetTokens;
029    
030    import java.util.List;
031    
032    import static org.jetbrains.jet.lang.resolve.java.AsmTypeConstants.OBJECT_TYPE;
033    
034    public class IdentityEquals extends IntrinsicMethod {
035        @NotNull
036        @Override
037        public Type generateImpl(
038                @NotNull ExpressionCodegen codegen,
039                @NotNull InstructionAdapter v,
040                @NotNull Type returnType,
041                PsiElement element,
042                List<JetExpression> arguments,
043                StackValue receiver
044        ) {
045            if (element instanceof JetCallExpression) {
046                receiver.put(OBJECT_TYPE, v);
047                codegen.gen(arguments.get(0)).put(OBJECT_TYPE, v);
048            }
049            else {
050                assert element instanceof JetBinaryExpression;
051                JetBinaryExpression e = (JetBinaryExpression) element;
052                codegen.gen(e.getLeft()).put(OBJECT_TYPE, v);
053                codegen.gen(e.getRight()).put(OBJECT_TYPE, v);
054            }
055            StackValue.cmp(JetTokens.EQEQEQ, OBJECT_TYPE).put(returnType, v);
056            return returnType;
057        }
058    }