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 020import java.io.DataOutputStream; 021import java.io.IOException; 022 023import org.apache.bcel.util.ByteSequence; 024 025/** 026 * BIPUSH - Push byte on stack 027 * 028 * <PRE>Stack: ... -> ..., value</PRE> 029 * 030 * @version $Id: BIPUSH.java 1812166 2017-10-13 23:48:11Z ggregory $ 031 */ 032public class BIPUSH extends Instruction implements ConstantPushInstruction { 033 034 private byte b; 035 036 037 /** 038 * Empty constructor needed for Instruction.readInstruction. 039 * Not to be used otherwise. 040 */ 041 BIPUSH() { 042 } 043 044 045 /** Push byte on stack 046 */ 047 public BIPUSH(final byte b) { 048 super(org.apache.bcel.Const.BIPUSH, (short) 2); 049 this.b = b; 050 } 051 052 053 /** 054 * Dump instruction as byte code to stream out. 055 */ 056 @Override 057 public void dump( final DataOutputStream out ) throws IOException { 058 super.dump(out); 059 out.writeByte(b); 060 } 061 062 063 /** 064 * @return mnemonic for instruction 065 */ 066 @Override 067 public String toString( final boolean verbose ) { 068 return super.toString(verbose) + " " + b; 069 } 070 071 072 /** 073 * Read needed data (e.g. index) from file. 074 */ 075 @Override 076 protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { 077 super.setLength(2); 078 b = bytes.readByte(); 079 } 080 081 082 @Override 083 public Number getValue() { 084 return Integer.valueOf(b); 085 } 086 087 088 /** @return Type.BYTE 089 */ 090 @Override 091 public Type getType( final ConstantPoolGen cp ) { 092 return Type.BYTE; 093 } 094 095 096 /** 097 * Call corresponding visitor method(s). The order is: 098 * Call visitor methods of implemented interfaces first, then 099 * call methods according to the class hierarchy in descending order, 100 * i.e., the most specific visitXXX() call comes last. 101 * 102 * @param v Visitor object 103 */ 104 @Override 105 public void accept( final Visitor v ) { 106 v.visitPushInstruction(this); 107 v.visitStackProducer(this); 108 v.visitTypedInstruction(this); 109 v.visitConstantPushInstruction(this); 110 v.visitBIPUSH(this); 111 } 112}