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 * SIPUSH - Push short 027 * 028 * <PRE>Stack: ... -> ..., value</PRE> 029 * 030 */ 031public class SIPUSH extends Instruction implements ConstantPushInstruction { 032 033 private short b; 034 035 036 /** 037 * Empty constructor needed for Instruction.readInstruction. 038 * Not to be used otherwise. 039 */ 040 SIPUSH() { 041 } 042 043 044 public SIPUSH(final short b) { 045 super(org.apache.bcel.Const.SIPUSH, (short) 3); 046 this.b = b; 047 } 048 049 050 /** 051 * Dump instruction as short code to stream out. 052 */ 053 @Override 054 public void dump( final DataOutputStream out ) throws IOException { 055 super.dump(out); 056 out.writeShort(b); 057 } 058 059 060 /** 061 * @return mnemonic for instruction 062 */ 063 @Override 064 public String toString( final boolean verbose ) { 065 return super.toString(verbose) + " " + b; 066 } 067 068 069 /** 070 * Read needed data (e.g. index) from file. 071 */ 072 @Override 073 protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { 074 super.setLength(3); 075 b = bytes.readShort(); 076 } 077 078 079 @Override 080 public Number getValue() { 081 return Integer.valueOf(b); 082 } 083 084 085 /** @return Type.SHORT 086 */ 087 @Override 088 public Type getType( final ConstantPoolGen cp ) { 089 return Type.SHORT; 090 } 091 092 093 /** 094 * Call corresponding visitor method(s). The order is: 095 * Call visitor methods of implemented interfaces first, then 096 * call methods according to the class hierarchy in descending order, 097 * i.e., the most specific visitXXX() call comes last. 098 * 099 * @param v Visitor object 100 */ 101 @Override 102 public void accept( final Visitor v ) { 103 v.visitPushInstruction(this); 104 v.visitStackProducer(this); 105 v.visitTypedInstruction(this); 106 v.visitConstantPushInstruction(this); 107 v.visitSIPUSH(this); 108 } 109}