001    /*
002     * Copyright 2010-2014 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.annotations.Nullable;
022    import org.jetbrains.jet.codegen.ExpressionCodegen;
023    import org.jetbrains.jet.codegen.StackValue;
024    import org.jetbrains.jet.lang.psi.JetElement;
025    import org.jetbrains.jet.lang.psi.JetExpression;
026    import org.jetbrains.jet.lang.psi.JetSuperExpression;
027    import org.jetbrains.jet.lang.resolve.calls.model.ResolvedCall;
028    import org.jetbrains.jet.lang.resolve.scopes.receivers.ExpressionReceiver;
029    import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverValue;
030    import org.jetbrains.org.objectweb.asm.Type;
031    import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter;
032    
033    import java.util.List;
034    
035    import static org.jetbrains.jet.lang.resolve.calls.callUtil.CallUtilPackage.getResolvedCallWithAssert;
036    import static org.jetbrains.jet.lang.resolve.java.AsmTypeConstants.OBJECT_TYPE;
037    
038    public class Clone extends IntrinsicMethod {
039        @NotNull
040        @Override
041        protected Type generateImpl(
042                @NotNull ExpressionCodegen codegen,
043                @NotNull InstructionAdapter v,
044                @NotNull Type returnType,
045                @Nullable PsiElement element,
046                @Nullable List<JetExpression> arguments,
047                @Nullable StackValue receiver
048        ) {
049            ResolvedCall<?> resolvedCall = getResolvedCallWithAssert(((JetElement) element), codegen.getBindingContext());
050            StackValue.receiver(resolvedCall, receiver, codegen, null).put(OBJECT_TYPE, v);
051            if (isSuperCall(resolvedCall)) {
052                v.invokespecial("java/lang/Object", "clone", "()Ljava/lang/Object;", false);
053            }
054            else {
055                v.invokevirtual("java/lang/Object", "clone", "()Ljava/lang/Object;", false);
056            }
057            return OBJECT_TYPE;
058        }
059    
060        private static boolean isSuperCall(@NotNull ResolvedCall<?> resolvedCall) {
061            ReceiverValue dispatchReceiver = resolvedCall.getDispatchReceiver();
062            return dispatchReceiver instanceof ExpressionReceiver &&
063                   ((ExpressionReceiver) dispatchReceiver).getExpression() instanceof JetSuperExpression;
064        }
065    }