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.asm4.Type;
022    import org.jetbrains.asm4.commons.InstructionAdapter;
023    import org.jetbrains.jet.codegen.ExpressionCodegen;
024    import org.jetbrains.jet.codegen.StackValue;
025    import org.jetbrains.jet.codegen.state.GenerationState;
026    import org.jetbrains.jet.lang.psi.JetCallExpression;
027    import org.jetbrains.jet.lang.psi.JetExpression;
028    import org.jetbrains.jet.lang.resolve.java.AsmTypeConstants;
029    import org.jetbrains.jet.lexer.JetTokens;
030    
031    import java.util.List;
032    
033    import static org.jetbrains.jet.codegen.AsmUtil.genEqualsForExpressionsOnStack;
034    
035    public class Equals implements IntrinsicMethod {
036        @Override
037        public StackValue generate(
038                ExpressionCodegen codegen,
039                InstructionAdapter v,
040                @NotNull Type expectedType,
041                PsiElement element,
042                List<JetExpression> arguments,
043                StackValue receiver,
044                @NotNull GenerationState state
045        ) {
046            StackValue leftExpr;
047            JetExpression rightExpr;
048            if (element instanceof JetCallExpression) {
049                leftExpr = receiver;
050                rightExpr = arguments.get(0);
051            }
052            else {
053                leftExpr = codegen.gen(arguments.get(0));
054                rightExpr = arguments.get(1);
055            }
056    
057            leftExpr.put(AsmTypeConstants.OBJECT_TYPE, v);
058            codegen.gen(rightExpr).put(AsmTypeConstants.OBJECT_TYPE, v);
059    
060            return genEqualsForExpressionsOnStack(v, JetTokens.EQEQ, AsmTypeConstants.OBJECT_TYPE, AsmTypeConstants.OBJECT_TYPE);
061        }
062    }