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1 package org.apache.bcel.generic; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache BCEL" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache BCEL", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 */ 56 import org.apache.bcel.Constants; 57 import java.io.*; 58 59 /*** 60 * Wrapper class for push operations, which are implemented either as BIPUSH, 61 * LDC or xCONST_n instructions. 62 * 63 * @version $Id: PUSH.java,v 1.1.1.1 2001/10/29 20:00:25 jvanzyl Exp $ 64 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 65 */ 66 public final class PUSH 67 implements CompoundInstruction, VariableLengthInstruction, InstructionConstants 68 { 69 private Instruction instruction; 70 71 /*** 72 * This constructor also applies for values of type short, char, byte 73 * 74 * @param cp Constant pool 75 * @param value to be pushed 76 */ 77 public PUSH(ConstantPoolGen cp, int value) { 78 if((value >= -1) && (value <= 5)) // Use ICONST_n 79 instruction = INSTRUCTIONS[Constants.ICONST_0 + value]; 80 else if((value >= -128) && (value <= 127)) // Use BIPUSH 81 instruction = new BIPUSH((byte)value); 82 else if((value >= -32768) && (value <= 32767)) // Use SIPUSH 83 instruction = new SIPUSH((short)value); 84 else // If everything fails create a Constant pool entry 85 instruction = new LDC(cp.addInteger(value)); 86 } 87 88 /*** 89 * @param cp Constant pool 90 * @param value to be pushed 91 */ 92 public PUSH(ConstantPoolGen cp, boolean value) { 93 instruction = INSTRUCTIONS[Constants.ICONST_0 + (value? 1 : 0)]; 94 } 95 96 /*** 97 * @param cp Constant pool 98 * @param value to be pushed 99 */ 100 public PUSH(ConstantPoolGen cp, float value) { 101 if(value == 0.0) 102 instruction = FCONST_0; 103 else if(value == 1.0) 104 instruction = FCONST_1; 105 else if(value == 2.0) 106 instruction = FCONST_2; 107 else // Create a Constant pool entry 108 instruction = new LDC(cp.addFloat(value)); 109 } 110 111 /*** 112 * @param cp Constant pool 113 * @param value to be pushed 114 */ 115 public PUSH(ConstantPoolGen cp, long value) { 116 if(value == 0) 117 instruction = LCONST_0; 118 else if(value == 1) 119 instruction = LCONST_1; 120 else // Create a Constant pool entry 121 instruction = new LDC2_W(cp.addLong(value)); 122 } 123 124 /*** 125 * @param cp Constant pool 126 * @param value to be pushed 127 */ 128 public PUSH(ConstantPoolGen cp, double value) { 129 if(value == 0.0) 130 instruction = DCONST_0; 131 else if(value == 1.0) 132 instruction = DCONST_1; 133 else // Create a Constant pool entry 134 instruction = new LDC2_W(cp.addDouble(value)); 135 } 136 137 /*** 138 * @param cp Constant pool 139 * @param value to be pushed 140 */ 141 public PUSH(ConstantPoolGen cp, String value) { 142 if(value == null) 143 instruction = ACONST_NULL; 144 else // Create a Constant pool entry 145 instruction = new LDC(cp.addString(value)); 146 } 147 148 /*** 149 * @param cp Constant pool 150 * @param value to be pushed 151 */ 152 public PUSH(ConstantPoolGen cp, Number value) { 153 if((value instanceof Integer) || (value instanceof Short) || (value instanceof Byte)) 154 instruction = new PUSH(cp, value.intValue()).instruction; 155 else if(value instanceof Double) 156 instruction = new PUSH(cp, value.doubleValue()).instruction; 157 else if(value instanceof Float) 158 instruction = new PUSH(cp, value.floatValue()).instruction; 159 else if(value instanceof Long) 160 instruction = new PUSH(cp, value.longValue()).instruction; 161 else 162 throw new ClassGenException("What's this: " + value); 163 } 164 165 /*** 166 * @param cp Constant pool 167 * @param value to be pushed 168 */ 169 public PUSH(ConstantPoolGen cp, Character value) { 170 this(cp, (int)value.charValue()); 171 } 172 173 /*** 174 * @param cp Constant pool 175 * @param value to be pushed 176 */ 177 public PUSH(ConstantPoolGen cp, Boolean value) { 178 this(cp, value.booleanValue()); 179 } 180 181 public final InstructionList getInstructionList() { 182 return new InstructionList(instruction); 183 } 184 185 public final Instruction getInstruction() { 186 return instruction; 187 } 188 189 /*** 190 * @return mnemonic for instruction 191 */ 192 public String toString() { 193 return instruction.toString() + " (PUSH)"; 194 } 195 } 196

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