Mercurial > hg > blitz_condensed
comparison src/com/go/trove/classfile/LocalVariableTableAttr.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.util.*; | |
56 import java.io.*; | |
57 | |
58 /****************************************************************************** | |
59 * This class corresponds to the LocalVariableTable_attribute structure as | |
60 * defined in section 4.7.7 of <i>The Java Virtual Machine Specification</i>. | |
61 * | |
62 * @author Brian S O'Neill | |
63 * @version | |
64 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 00/11/27 <!-- $--> | |
65 */ | |
66 class LocalVariableTableAttr extends Attribute { | |
67 private List mEntries = new ArrayList(10); | |
68 private List mCleanEntries; | |
69 private int mRangeCount; | |
70 | |
71 public LocalVariableTableAttr(ConstantPool cp) { | |
72 super(cp, LOCAL_VARIABLE_TABLE); | |
73 } | |
74 | |
75 /** | |
76 * Add an entry into the LocalVariableTableAttr. | |
77 */ | |
78 public void addEntry(LocalVariable localVar) { | |
79 String varName = localVar.getName(); | |
80 if (varName != null) { | |
81 ConstantUTFInfo name = ConstantUTFInfo.make(mCp, varName); | |
82 ConstantUTFInfo descriptor = | |
83 ConstantUTFInfo.make(mCp, localVar.getType().toString()); | |
84 | |
85 mEntries.add(new Entry(localVar, name, descriptor)); | |
86 } | |
87 | |
88 mCleanEntries = null; | |
89 } | |
90 | |
91 public int getLength() { | |
92 clean(); | |
93 return 2 + 10 * mRangeCount; | |
94 } | |
95 | |
96 public void writeDataTo(DataOutput dout) throws IOException { | |
97 dout.writeShort(mRangeCount); | |
98 | |
99 int size = mCleanEntries.size(); | |
100 for (int i=0; i<size; i++) { | |
101 Entry entry = (Entry)mEntries.get(i); | |
102 LocalVariable localVar = entry.mLocalVar; | |
103 | |
104 SortedSet ranges = localVar.getLocationRangeSet(); | |
105 | |
106 int name_index = entry.mName.getIndex(); | |
107 int descriptor_index = entry.mDescriptor.getIndex(); | |
108 int index = localVar.getNumber(); | |
109 | |
110 check("local variable table entry name index", name_index); | |
111 check("local variable table entry descriptor index", | |
112 descriptor_index); | |
113 check("local variable table entry index", index); | |
114 | |
115 Iterator it = ranges.iterator(); | |
116 while (it.hasNext()) { | |
117 LocationRange range = (LocationRange)it.next(); | |
118 | |
119 Location startLocation = range.getStartLocation(); | |
120 Location endLocation = range.getEndLocation(); | |
121 | |
122 int start_pc = startLocation.getLocation(); | |
123 int length = endLocation.getLocation() - start_pc - 1; | |
124 | |
125 check("local variable table entry start PC", start_pc); | |
126 | |
127 dout.writeShort(start_pc); | |
128 dout.writeShort(length); | |
129 dout.writeShort(name_index); | |
130 dout.writeShort(descriptor_index); | |
131 dout.writeShort(index); | |
132 } | |
133 } | |
134 } | |
135 | |
136 private void check(String type, int addr) throws RuntimeException { | |
137 if (addr < 0 || addr > 65535) { | |
138 throw new RuntimeException("Value for " + type + " out of " + | |
139 "valid range: " + addr); | |
140 } | |
141 } | |
142 | |
143 private void clean() { | |
144 if (mCleanEntries != null) { | |
145 return; | |
146 } | |
147 | |
148 // Clean out entries that are incomplete or bogus. | |
149 | |
150 int size = mEntries.size(); | |
151 mCleanEntries = new ArrayList(size); | |
152 mRangeCount = 0; | |
153 | |
154 outer: | |
155 for (int i=0; i<size; i++) { | |
156 Entry entry = (Entry)mEntries.get(i); | |
157 LocalVariable localVar = entry.mLocalVar; | |
158 | |
159 SortedSet ranges = localVar.getLocationRangeSet(); | |
160 if (ranges == null || ranges.size() == 0) { | |
161 continue; | |
162 } | |
163 | |
164 Iterator it = ranges.iterator(); | |
165 while (it.hasNext()) { | |
166 LocationRange range = (LocationRange)it.next(); | |
167 | |
168 Location startLocation = range.getStartLocation(); | |
169 Location endLocation = range.getEndLocation(); | |
170 | |
171 if (startLocation == null || endLocation == null) { | |
172 continue outer; | |
173 } | |
174 | |
175 int start_pc = startLocation.getLocation(); | |
176 int length = endLocation.getLocation() - start_pc - 1; | |
177 | |
178 if (length < 0) { | |
179 continue outer; | |
180 } | |
181 } | |
182 | |
183 mCleanEntries.add(entry); | |
184 mRangeCount += entry.getRangeCount(); | |
185 } | |
186 } | |
187 | |
188 static Attribute define(ConstantPool cp, | |
189 String name, | |
190 int length, | |
191 DataInput din) throws IOException { | |
192 | |
193 LocalVariableTableAttr locals = new LocalVariableTableAttr(cp); | |
194 | |
195 int size = din.readUnsignedShort(); | |
196 for (int i=0; i<size; i++) { | |
197 int start_pc = din.readUnsignedShort(); | |
198 int end_pc = start_pc + din.readUnsignedShort() + 1; | |
199 int name_index = din.readUnsignedShort(); | |
200 int descriptor_index = din.readUnsignedShort(); | |
201 final int index = din.readUnsignedShort(); | |
202 | |
203 final ConstantUTFInfo varName = | |
204 (ConstantUTFInfo)cp.getConstant(name_index); | |
205 final ConstantUTFInfo varDesc = | |
206 (ConstantUTFInfo)cp.getConstant(descriptor_index); | |
207 | |
208 final Location startLocation = new FixedLocation(start_pc); | |
209 final Location endLocation = new FixedLocation(end_pc); | |
210 | |
211 SortedSet ranges = new TreeSet(); | |
212 ranges.add(new LocationRangeImpl(startLocation, endLocation)); | |
213 final SortedSet fRanges = | |
214 Collections.unmodifiableSortedSet(ranges); | |
215 | |
216 LocalVariable localVar = new LocalVariable() { | |
217 private String mName; | |
218 private TypeDescriptor mType; | |
219 | |
220 { | |
221 mName = varName.getValue(); | |
222 mType = TypeDescriptor.parseTypeDesc(varDesc.getValue()); | |
223 } | |
224 | |
225 public String getName() { | |
226 return mName; | |
227 } | |
228 | |
229 public void setName(String name) { | |
230 mName = name; | |
231 } | |
232 | |
233 public TypeDescriptor getType() { | |
234 return mType; | |
235 } | |
236 | |
237 public boolean isDoubleWord() { | |
238 Class clazz = mType.getClassArg(); | |
239 return (clazz == double.class || clazz == long.class); | |
240 } | |
241 | |
242 public int getNumber() { | |
243 return index; | |
244 } | |
245 | |
246 public SortedSet getLocationRangeSet() { | |
247 return fRanges; | |
248 } | |
249 }; | |
250 | |
251 Entry entry = new Entry(localVar, varName, varDesc); | |
252 locals.mEntries.add(entry); | |
253 } | |
254 | |
255 return locals; | |
256 } | |
257 | |
258 private static class Entry { | |
259 public LocalVariable mLocalVar; | |
260 public ConstantUTFInfo mName; | |
261 public ConstantUTFInfo mDescriptor; | |
262 | |
263 public Entry(LocalVariable localVar, | |
264 ConstantUTFInfo name, ConstantUTFInfo descriptor) { | |
265 | |
266 mLocalVar = localVar; | |
267 mName = name; | |
268 mDescriptor = descriptor; | |
269 } | |
270 | |
271 public int getRangeCount() { | |
272 return mLocalVar.getLocationRangeSet().size(); | |
273 } | |
274 } | |
275 } |