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
017package org.jetbrains.jet.codegen.intrinsics;
018
019import com.intellij.psi.PsiElement;
020import org.jetbrains.annotations.NotNull;
021import org.jetbrains.asm4.Type;
022import org.jetbrains.asm4.commons.InstructionAdapter;
023import org.jetbrains.jet.codegen.ExpressionCodegen;
024import org.jetbrains.jet.codegen.StackValue;
025import org.jetbrains.jet.codegen.state.GenerationState;
026import org.jetbrains.jet.lang.psi.JetBinaryExpression;
027import org.jetbrains.jet.lang.psi.JetCallExpression;
028import org.jetbrains.jet.lang.psi.JetExpression;
029import org.jetbrains.jet.lexer.JetTokens;
030
031import java.util.List;
032
033import static org.jetbrains.jet.lang.resolve.java.AsmTypeConstants.OBJECT_TYPE;
034
035public class IdentityEquals 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        if (element instanceof JetCallExpression) {
047            receiver.put(OBJECT_TYPE, v);
048            codegen.gen(arguments.get(0)).put(OBJECT_TYPE, v);
049        }
050        else {
051            assert element instanceof JetBinaryExpression;
052            JetBinaryExpression e = (JetBinaryExpression) element;
053            codegen.gen(e.getLeft()).put(OBJECT_TYPE, v);
054            codegen.gen(e.getRight()).put(OBJECT_TYPE, v);
055        }
056        return StackValue.cmp(JetTokens.EQEQEQ, OBJECT_TYPE);
057    }
058}