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 * 017 */ 018package org.apache.bcel.generic; 019 020/** 021 * Denotes an unparameterized instruction to load a value from a local variable, e.g. ILOAD. 022 * 023 */ 024public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction { 025 026 /** 027 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. tag and length are defined in 028 * readInstruction and initFromFile, respectively. 029 */ 030 LoadInstruction(final short canon_tag, final short c_tag) { 031 super(canon_tag, c_tag); 032 } 033 034 /** 035 * @param opcode Instruction opcode 036 * @param c_tag Instruction number for compact version, ALOAD_0, e.g. 037 * @param n local variable index (unsigned short) 038 */ 039 protected LoadInstruction(final short opcode, final short c_tag, final int n) { 040 super(opcode, c_tag, n); 041 } 042 043 /** 044 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call 045 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last. 046 * 047 * @param v Visitor object 048 */ 049 @Override 050 public void accept(final Visitor v) { 051 v.visitStackProducer(this); 052 v.visitPushInstruction(this); 053 v.visitTypedInstruction(this); 054 v.visitLocalVariableInstruction(this); 055 v.visitLoadInstruction(this); 056 } 057}