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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