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 org.apache.bcel.classfile.*;
58 import java.util.StringTokenizer;
59
60 /***
61 * Super class for the INVOKExxx family of instructions.
62 *
63 * @version $Id: InvokeInstruction.java,v 1.1.1.1 2001/10/29 20:00:20 jvanzyl Exp $
64 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
65 */
66 public abstract class InvokeInstruction extends FieldOrMethod
67 implements ExceptionThrower, TypedInstruction, StackConsumer, StackProducer {
68 /***
69 * Empty constructor needed for the Class.newInstance() statement in
70 * Instruction.readInstruction(). Not to be used otherwise.
71 */
72 InvokeInstruction() {}
73
74 /***
75 * @param index to constant pool
76 */
77 protected InvokeInstruction(short opcode, int index) {
78 super(opcode, index);
79 }
80
81 /***
82 * @return mnemonic for instruction with symbolic references resolved
83 */
84 public String toString(ConstantPool cp) {
85 Constant c = cp.getConstant(index);
86 StringTokenizer tok = new StringTokenizer(cp.constantToString(c));
87
88 return Constants.OPCODE_NAMES[opcode] + " " +
89 tok.nextToken().replace('.', '/') + tok.nextToken();
90 }
91
92 /***
93 * Also works for instructions whose stack effect depends on the
94 * constant pool entry they reference.
95 * @return Number of words consumed from stack by this instruction
96 */
97 public int consumeStack(ConstantPoolGen cpg) {
98 String signature = getSignature(cpg);
99 Type[] args = Type.getArgumentTypes(signature);
100 int sum;
101
102 if(opcode == Constants.INVOKESTATIC)
103 sum = 0;
104 else
105 sum = 1; // this reference
106
107 int n = args.length;
108 for (int i = 0; i < n; i++)
109 sum += args[i].getSize();
110
111 return sum;
112 }
113
114 /***
115 * Also works for instructions whose stack effect depends on the
116 * constant pool entry they reference.
117 * @return Number of words produced onto stack by this instruction
118 */
119 public int produceStack(ConstantPoolGen cpg) {
120 return getReturnType(cpg).getSize();
121 }
122
123 /*** @return return type of referenced method.
124 */
125 public Type getType(ConstantPoolGen cpg) {
126 return getReturnType(cpg);
127 }
128
129 /*** @return name of referenced method.
130 */
131 public String getMethodName(ConstantPoolGen cpg) {
132 return getName(cpg);
133 }
134
135 /*** @return return type of referenced method.
136 */
137 public Type getReturnType(ConstantPoolGen cpg) {
138 return Type.getReturnType(getSignature(cpg));
139 }
140
141 /*** @return argument types of referenced method.
142 */
143 public Type[] getArgumentTypes(ConstantPoolGen cpg) {
144 return Type.getArgumentTypes(getSignature(cpg));
145 }
146 }
This page was automatically generated by Maven