1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 package org.apache.bcel.generic; 19 20 /** 21 * Denotes an unparameterized instruction to load a value from a local 22 * variable, e.g. ILOAD. 23 * 24 * @version $Id$ 25 */ 26 public abstract class LoadInstruction extends LocalVariableInstruction implements PushInstruction { 27 28 /** 29 * Empty constructor needed for Instruction.readInstruction. 30 * Not to be used otherwise. 31 * tag and length are defined in readInstruction and initFromFile, respectively. 32 */ LoadInstruction(final short canon_tag, final short c_tag)33 LoadInstruction(final short canon_tag, final short c_tag) { 34 super(canon_tag, c_tag); 35 } 36 37 38 /** 39 * @param opcode Instruction opcode 40 * @param c_tag Instruction number for compact version, ALOAD_0, e.g. 41 * @param n local variable index (unsigned short) 42 */ LoadInstruction(final short opcode, final short c_tag, final int n)43 protected LoadInstruction(final short opcode, final short c_tag, final int n) { 44 super(opcode, c_tag, n); 45 } 46 47 48 /** 49 * Call corresponding visitor method(s). The order is: 50 * Call visitor methods of implemented interfaces first, then 51 * call methods according to the class hierarchy in descending order, 52 * i.e., the most specific visitXXX() call comes last. 53 * 54 * @param v Visitor object 55 */ 56 @Override accept( final Visitor v )57 public void accept( final Visitor v ) { 58 v.visitStackProducer(this); 59 v.visitPushInstruction(this); 60 v.visitTypedInstruction(this); 61 v.visitLocalVariableInstruction(this); 62 v.visitLoadInstruction(this); 63 } 64 } 65