Mercurial > hg > blitz_condensed
comparison src/com/go/trove/classfile/ExceptionHandler.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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-1:000000000000 | 0:3dc0c5604566 |
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1 /* ==================================================================== | |
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group | |
3 * ==================================================================== | |
4 * The Tea Software License, Version 1.1 | |
5 * | |
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. | |
7 * | |
8 * Redistribution and use in source and binary forms, with or without | |
9 * modification, are permitted provided that the following conditions | |
10 * are met: | |
11 * | |
12 * 1. Redistributions of source code must retain the above copyright | |
13 * notice, this list of conditions and the following disclaimer. | |
14 * | |
15 * 2. Redistributions in binary form must reproduce the above copyright | |
16 * notice, this list of conditions and the following disclaimer in | |
17 * the documentation and/or other materials provided with the | |
18 * distribution. | |
19 * | |
20 * 3. The end-user documentation included with the redistribution, | |
21 * if any, must include the following acknowledgment: | |
22 * "This product includes software developed by the | |
23 * Walt Disney Internet Group (http://opensource.go.com/)." | |
24 * Alternately, this acknowledgment may appear in the software itself, | |
25 * if and wherever such third-party acknowledgments normally appear. | |
26 * | |
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must | |
28 * not be used to endorse or promote products derived from this | |
29 * software without prior written permission. For written | |
30 * permission, please contact opensource@dig.com. | |
31 * | |
32 * 5. Products derived from this software may not be called "Tea", | |
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", | |
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior | |
35 * written permission of the Walt Disney Internet Group. | |
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 WALT DISNEY INTERNET GROUP OR ITS | |
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 * ==================================================================== | |
49 * | |
50 * For more information about Tea, please see http://opensource.go.com/. | |
51 */ | |
52 | |
53 package com.go.trove.classfile; | |
54 | |
55 import java.io.*; | |
56 | |
57 /****************************************************************************** | |
58 * This class corresponds to the exception_table structure as defined in | |
59 * section 4.7.4 of <i>The Java Virtual Machine Specification</i>. | |
60 * | |
61 * @author Brian S O'Neill | |
62 * @version | |
63 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $--> | |
64 */ | |
65 public class ExceptionHandler implements LocationRange { | |
66 private Location mStart; | |
67 private Location mEnd; | |
68 private Location mCatch; | |
69 private ConstantClassInfo mCatchType; | |
70 | |
71 /** | |
72 * @param startLocation | |
73 * @param endLocation | |
74 * @param catchLocation | |
75 * @param catchType if null, then catch every object. | |
76 */ | |
77 public ExceptionHandler(Location startLocation, | |
78 Location endLocation, | |
79 Location catchLocation, | |
80 ConstantClassInfo catchType) { | |
81 mStart = startLocation; | |
82 mEnd = endLocation; | |
83 mCatch = catchLocation; | |
84 mCatchType = catchType; | |
85 } | |
86 | |
87 public Location getStartLocation() { | |
88 return mStart; | |
89 } | |
90 | |
91 public Location getEndLocation() { | |
92 return mEnd; | |
93 } | |
94 | |
95 public Location getCatchLocation() { | |
96 return mCatch; | |
97 } | |
98 | |
99 /** | |
100 * Returns null if every object is caught by this handler. | |
101 */ | |
102 public ConstantClassInfo getCatchType() { | |
103 return mCatchType; | |
104 } | |
105 | |
106 public int compareTo(Object obj) { | |
107 if (this == obj) { | |
108 return 0; | |
109 } | |
110 | |
111 LocationRange other = (LocationRange)obj; | |
112 | |
113 int result = getStartLocation().compareTo(other.getStartLocation()); | |
114 | |
115 if (result == 0) { | |
116 result = getEndLocation().compareTo(other.getEndLocation()); | |
117 } | |
118 | |
119 if (result == 0 && obj instanceof ExceptionHandler) { | |
120 result = getCatchLocation().compareTo | |
121 (((ExceptionHandler)other).getCatchLocation()); | |
122 } | |
123 | |
124 return result; | |
125 } | |
126 | |
127 public void writeTo(DataOutput dout) throws IOException { | |
128 int start_pc = getStartLocation().getLocation(); | |
129 int end_pc = getEndLocation().getLocation(); | |
130 int handler_pc = getCatchLocation().getLocation(); | |
131 int catch_type; | |
132 ConstantClassInfo catchType = getCatchType(); | |
133 if (catchType == null) { | |
134 catch_type = 0; | |
135 } | |
136 else { | |
137 catch_type = catchType.getIndex(); | |
138 } | |
139 | |
140 check("exception start PC", start_pc); | |
141 check("exception end PC", end_pc); | |
142 check("exception handler PC", handler_pc); | |
143 | |
144 dout.writeShort(start_pc); | |
145 dout.writeShort(end_pc); | |
146 dout.writeShort(handler_pc); | |
147 dout.writeShort(catch_type); | |
148 } | |
149 | |
150 private void check(String type, int addr) throws RuntimeException { | |
151 if (addr < 0 || addr > 65535) { | |
152 throw new RuntimeException("Value for " + type + " out of " + | |
153 "valid range: " + addr); | |
154 | |
155 } | |
156 } | |
157 | |
158 static ExceptionHandler readFrom(ConstantPool cp, | |
159 DataInput din) throws IOException { | |
160 int start_pc = din.readUnsignedShort(); | |
161 int end_pc = din.readUnsignedShort(); | |
162 int handler_pc = din.readUnsignedShort(); | |
163 int catch_type = din.readUnsignedShort(); | |
164 | |
165 ConstantClassInfo catchTypeConstant; | |
166 if (catch_type == 0) { | |
167 catchTypeConstant = null; | |
168 } | |
169 else { | |
170 catchTypeConstant = (ConstantClassInfo)cp.getConstant(catch_type); | |
171 } | |
172 | |
173 return new ExceptionHandler(new FixedLocation(start_pc), | |
174 new FixedLocation(end_pc), | |
175 new FixedLocation(handler_pc), | |
176 catchTypeConstant); | |
177 } | |
178 } |