001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 */
017package org.apache.bcel.generic;
018
019import java.io.DataOutputStream;
020import java.io.IOException;
021
022import org.apache.bcel.Const;
023import org.apache.bcel.ExceptionConst;
024
025/**
026 * INVOKEVIRTUAL - Invoke instance method; dispatch based on class
027 *
028 * <PRE>
029 * Stack: ..., objectref, [arg1, [arg2 ...]] -&gt; ...
030 * </PRE>
031 *
032 * @see <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokevirtual"> The
033 *      invokevirtual instruction in The Java Virtual Machine Specification</a>
034 */
035public class INVOKEVIRTUAL extends InvokeInstruction {
036
037    /**
038     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
039     */
040    INVOKEVIRTUAL() {
041    }
042
043    public INVOKEVIRTUAL(final int index) {
044        super(Const.INVOKEVIRTUAL, index);
045    }
046
047    /**
048     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
049     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
050     *
051     * @param v Visitor object
052     */
053    @Override
054    public void accept(final Visitor v) {
055        v.visitExceptionThrower(this);
056        v.visitTypedInstruction(this);
057        v.visitStackConsumer(this);
058        v.visitStackProducer(this);
059        v.visitLoadClass(this);
060        v.visitCPInstruction(this);
061        v.visitFieldOrMethod(this);
062        v.visitInvokeInstruction(this);
063        v.visitINVOKEVIRTUAL(this);
064    }
065
066    /**
067     * Dump instruction as byte code to stream out.
068     *
069     * @param out Output stream
070     */
071    @Override
072    public void dump(final DataOutputStream out) throws IOException {
073        out.writeByte(super.getOpcode());
074        out.writeShort(super.getIndex());
075    }
076
077    @Override
078    public Class<?>[] getExceptions() {
079        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION, ExceptionConst.NULL_POINTER_EXCEPTION,
080            ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR, ExceptionConst.ABSTRACT_METHOD_ERROR, ExceptionConst.UNSATISFIED_LINK_ERROR);
081    }
082}