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.classfile.ConstantPool;
57 import org.apache.bcel.Constants;
58 import org.apache.bcel.ExceptionConstants;
59
60 import java.io.*;
61 import org.apache.bcel.util.ByteSequence;
62
63 /***
64 * INVOKEINTERFACE - Invoke interface method
65 * <PRE>Stack: ..., objectref, [arg1, [arg2 ...]] -> ...</PRE>
66 *
67 * @version $Id: INVOKEINTERFACE.java,v 1.1.1.1 2001/10/29 20:00:16 jvanzyl Exp $
68 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
69 */
70 public final class INVOKEINTERFACE extends InvokeInstruction {
71 private int nargs; // Number of arguments on stack (number of stack slots), called "count" in vmspec2
72
73 /***
74 * Empty constructor needed for the Class.newInstance() statement in
75 * Instruction.readInstruction(). Not to be used otherwise.
76 */
77 INVOKEINTERFACE() {}
78
79 public INVOKEINTERFACE(int index, int nargs) {
80 super(Constants.INVOKEINTERFACE, index);
81 length = 5;
82
83 if(nargs < 1)
84 throw new ClassGenException("Number of arguments must be > 0 " + nargs);
85
86 this.nargs = nargs;
87 }
88
89 /***
90 * Dump instruction as byte code to stream out.
91 * @param out Output stream
92 */
93 public void dump(DataOutputStream out) throws IOException {
94 out.writeByte(opcode);
95 out.writeShort(index);
96 out.writeByte(nargs);
97 out.writeByte(0);
98 }
99
100 /***
101 * The <B>count</B> argument according to the Java Language Specification,
102 * Second Edition.
103 */
104 public int getCount() { return nargs; }
105
106 /***
107 * Read needed data (i.e., index) from file.
108 */
109 protected void initFromFile(ByteSequence bytes, boolean wide)
110 throws IOException
111 {
112 super.initFromFile(bytes, wide);
113
114 length = 5;
115 nargs = bytes.readUnsignedByte();
116 bytes.readByte(); // Skip 0 byte
117 }
118
119 /***
120 * @return mnemonic for instruction with symbolic references resolved
121 */
122 public String toString(ConstantPool cp) {
123 return super.toString(cp) + " " + nargs;
124 }
125
126 public int consumeStack(ConstantPoolGen cpg) { // nargs is given in byte-code
127 return nargs; // nargs includes this reference
128 }
129
130 public Class[] getExceptions() {
131 Class[] cs = new Class[4 + ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length];
132
133 System.arraycopy(ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION, 0,
134 cs, 0, ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length);
135
136 cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+3] = ExceptionConstants.INCOMPATIBLE_CLASS_CHANGE_ERROR;
137 cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+2] = ExceptionConstants.ILLEGAL_ACCESS_ERROR;
138 cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+1] = ExceptionConstants.ABSTRACT_METHOD_ERROR;
139 cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length] = ExceptionConstants.UNSATISFIED_LINK_ERROR;
140
141 return cs;
142 }
143
144 /***
145 * Call corresponding visitor method(s). The order is:
146 * Call visitor methods of implemented interfaces first, then
147 * call methods according to the class hierarchy in descending order,
148 * i.e., the most specific visitXXX() call comes last.
149 *
150 * @param v Visitor object
151 */
152 public void accept(Visitor v) {
153 v.visitExceptionThrower(this);
154 v.visitTypedInstruction(this);
155 v.visitStackConsumer(this);
156 v.visitStackProducer(this);
157 v.visitLoadClass(this);
158 v.visitCPInstruction(this);
159 v.visitFieldOrMethod(this);
160 v.visitInvokeInstruction(this);
161 v.visitINVOKEINTERFACE(this);
162 }
163 }
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