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