01: /*
02: *
03: *
04: * Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
05: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License version
09: * 2 only, as published by the Free Software Foundation.
10: *
11: * This program is distributed in the hope that it will be useful, but
12: * WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * General Public License version 2 for more details (a copy is
15: * included at /legal/license.txt).
16: *
17: * You should have received a copy of the GNU General Public License
18: * version 2 along with this work; if not, write to the Free Software
19: * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA
21: *
22: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
23: * Clara, CA 95054 or visit www.sun.com if you need additional
24: * information or have any questions.
25: */
26:
27: package components;
28:
29: import java.io.DataOutput;
30: import java.io.IOException;
31: import util.DataFormatException;
32: import jcc.Const;
33:
34: /*
35: * An ExceptionEntry represents a range of Java bytecode PC values,
36: * a Java exception type, and an action to take should that exception be
37: * thrown in that range.
38: *
39: * Exception entries are read by components.MethodInfo, though perhaps
40: * that code should be moved here. At least we know how to write ourselves
41: * out.
42: */
43:
44: public class ExceptionEntry {
45: public ClassConstant catchType;
46:
47: public int startPC, endPC;
48: public int handlerPC;
49:
50: public static final int size = 8; // bytes in class files
51:
52: ExceptionEntry(int s, int e, int h, ClassConstant c) {
53: startPC = s;
54: endPC = e;
55: handlerPC = h;
56: catchType = c;
57: }
58:
59: public void write(DataOutput o) throws IOException {
60: o.writeShort(startPC);
61: o.writeShort(endPC);
62: o.writeShort(handlerPC);
63: o.writeShort((catchType == null) ? 0 : catchType.index);
64: }
65:
66: /*
67: * A class referenced from an ExceptionEntry
68: * is in the local constant pool, not the shared one.
69: *
70: * Thus it must not be externalized, but must be counted.
71: * These decisions could be exposed at a higher level, for some
72: * savings in performance, and should be when I have the
73: * courage of my convictions.
74: */
75: public void externalize(ConstantPool p) {
76: // do nothing.
77: }
78:
79: public void countConstantReferences() {
80: if (catchType != null)
81: catchType.incReference();
82: }
83: }
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