src/main/java/org/apache/bcel/generic/INVOKEVIRTUAL.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.bcel.generic;

import java.io.DataOutputStream;
import java.io.IOException;

import org.apache.bcel.Const;
import org.apache.bcel.ExceptionConst;

/**
 * INVOKEVIRTUAL - Invoke instance method; dispatch based on class
 *
 * <PRE>
 * Stack: ..., objectref, [arg1, [arg2 ...]] -&gt; ...
 * </PRE>
 *
 * @see <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokevirtual"> The
 *      invokevirtual instruction in The Java Virtual Machine Specification</a>
 */
public class INVOKEVIRTUAL extends InvokeInstruction {

    /**
     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
     */
    INVOKEVIRTUAL() {
    }

    public INVOKEVIRTUAL(final int index) {
        super(Const.INVOKEVIRTUAL, index);
    }

    /**
     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
     * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
     *
     * @param v Visitor object.
     */
    @Override
    public void accept(final Visitor v) {
        v.visitExceptionThrower(this);
        v.visitTypedInstruction(this);
        v.visitStackConsumer(this);
        v.visitStackProducer(this);
        v.visitLoadClass(this);
        v.visitCPInstruction(this);
        v.visitFieldOrMethod(this);
        v.visitInvokeInstruction(this);
        v.visitINVOKEVIRTUAL(this);
    }

    /**
     * Dumps instruction as byte code to stream out.
     *
     * @param out Output stream.
     */
    @Override
    public void dump(final DataOutputStream out) throws IOException {
        out.writeByte(super.getOpcode());
        out.writeShort(super.getIndex());
    }

    @Override
    public Class<?>[] getExceptions() {
        return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION, ExceptionConst.NULL_POINTER_EXCEPTION,
            ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR, ExceptionConst.ABSTRACT_METHOD_ERROR, ExceptionConst.UNSATISFIED_LINK_ERROR);
    }
}