001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.bcel.generic; 020 021import java.io.DataOutputStream; 022import java.io.IOException; 023 024import org.apache.bcel.Const; 025import org.apache.bcel.ExceptionConst; 026 027/** 028 * INVOKEVIRTUAL - Invoke instance method; dispatch based on class 029 * 030 * <PRE> 031 * Stack: ..., objectref, [arg1, [arg2 ...]] -> ... 032 * </PRE> 033 * 034 * @see <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokevirtual"> The 035 * invokevirtual instruction in The Java Virtual Machine Specification</a> 036 */ 037public class INVOKEVIRTUAL extends InvokeInstruction { 038 039 /** 040 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. 041 */ 042 INVOKEVIRTUAL() { 043 } 044 045 public INVOKEVIRTUAL(final int index) { 046 super(Const.INVOKEVIRTUAL, index); 047 } 048 049 /** 050 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call 051 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last. 052 * 053 * @param v Visitor object 054 */ 055 @Override 056 public void accept(final Visitor v) { 057 v.visitExceptionThrower(this); 058 v.visitTypedInstruction(this); 059 v.visitStackConsumer(this); 060 v.visitStackProducer(this); 061 v.visitLoadClass(this); 062 v.visitCPInstruction(this); 063 v.visitFieldOrMethod(this); 064 v.visitInvokeInstruction(this); 065 v.visitINVOKEVIRTUAL(this); 066 } 067 068 /** 069 * Dump instruction as byte code to stream out. 070 * 071 * @param out Output stream 072 */ 073 @Override 074 public void dump(final DataOutputStream out) throws IOException { 075 out.writeByte(super.getOpcode()); 076 out.writeShort(super.getIndex()); 077 } 078 079 @Override 080 public Class<?>[] getExceptions() { 081 return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_FIELD_AND_METHOD_RESOLUTION, ExceptionConst.NULL_POINTER_EXCEPTION, 082 ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR, ExceptionConst.ABSTRACT_METHOD_ERROR, ExceptionConst.UNSATISFIED_LINK_ERROR); 083 } 084}