Mercurial > hg > blitz_condensed
comparison src/com/go/trove/classfile/CodeAttr.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 Code_attribute structure as defined in | |
60 * section 4.7.4 of <i>The Java Virtual Machine Specification</i>. | |
61 * To make it easier to create bytecode for the CodeAttr, use the | |
62 * CodeBuilder. | |
63 * | |
64 * @author Brian S O'Neill | |
65 * @version | |
66 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 01/01/02 <!-- $--> | |
67 * @see Opcode | |
68 * @see CodeBuilder | |
69 */ | |
70 public class CodeAttr extends Attribute { | |
71 private CodeBuffer mCodeBuffer; | |
72 private List mAttributes = new ArrayList(2); | |
73 | |
74 private LineNumberTableAttr mLineNumberTable; | |
75 private LocalVariableTableAttr mLocalVariableTable; | |
76 | |
77 CodeAttr(ConstantPool cp) { | |
78 super(cp, CODE); | |
79 } | |
80 | |
81 /** | |
82 * Returns null if no CodeBuffer is defined for this CodeAttr. | |
83 */ | |
84 public CodeBuffer getCodeBuffer() { | |
85 return mCodeBuffer; | |
86 } | |
87 | |
88 public void setCodeBuffer(CodeBuffer code) { | |
89 mCodeBuffer = code; | |
90 } | |
91 | |
92 /** | |
93 * Returns the line number in the source code from the given bytecode | |
94 * address (start_pc). | |
95 * | |
96 * @return -1 if no line number is mapped for the start_pc. | |
97 */ | |
98 public int getLineNumber(Location start) { | |
99 if (mLineNumberTable == null || start.getLocation() < 0) { | |
100 return -1; | |
101 } | |
102 else { | |
103 return mLineNumberTable.getLineNumber(start); | |
104 } | |
105 } | |
106 | |
107 /** | |
108 * Map a bytecode address (start_pc) to a line number in the source code | |
109 * as a debugging aid. | |
110 */ | |
111 public void mapLineNumber(Location start, int line_number) { | |
112 if (mLineNumberTable == null) { | |
113 addAttribute(new LineNumberTableAttr(mCp)); | |
114 } | |
115 | |
116 mLineNumberTable.addEntry(start, line_number); | |
117 } | |
118 | |
119 /** | |
120 * Indicate a local variable's use information be recorded in the | |
121 * ClassFile as a debugging aid. If the LocalVariable doesn't provide | |
122 * both a start and end location, then its information is not recorded. | |
123 * This method should be called at most once per LocalVariable instance. | |
124 */ | |
125 public void localVariableUse(LocalVariable localVar) { | |
126 if (mLocalVariableTable == null) { | |
127 addAttribute(new LocalVariableTableAttr(mCp)); | |
128 } | |
129 | |
130 mLocalVariableTable.addEntry(localVar); | |
131 } | |
132 | |
133 public void addAttribute(Attribute attr) { | |
134 if (attr instanceof LineNumberTableAttr) { | |
135 if (mLineNumberTable != null) { | |
136 mAttributes.remove(mLineNumberTable); | |
137 } | |
138 mLineNumberTable = (LineNumberTableAttr)attr; | |
139 } | |
140 else if (attr instanceof LocalVariableTableAttr) { | |
141 if (mLocalVariableTable != null) { | |
142 mAttributes.remove(mLocalVariableTable); | |
143 } | |
144 mLocalVariableTable = (LocalVariableTableAttr)attr; | |
145 } | |
146 | |
147 mAttributes.add(attr); | |
148 } | |
149 | |
150 public Attribute[] getAttributes() { | |
151 Attribute[] attrs = new Attribute[mAttributes.size()]; | |
152 return (Attribute[])mAttributes.toArray(attrs); | |
153 } | |
154 | |
155 /** | |
156 * Returns the length (in bytes) of this object in the class file. | |
157 */ | |
158 public int getLength() { | |
159 int length = 12; | |
160 | |
161 if (mCodeBuffer != null) { | |
162 length += mCodeBuffer.getByteCodes().length; | |
163 ExceptionHandler[] handlers = mCodeBuffer.getExceptionHandlers(); | |
164 if (handlers != null) { | |
165 length += 8 * handlers.length; | |
166 } | |
167 } | |
168 | |
169 int size = mAttributes.size(); | |
170 for (int i=0; i<size; i++) { | |
171 length += ((Attribute)mAttributes.get(i)).getLength(); | |
172 length += 6; // attributes have an intial 6 byte length | |
173 } | |
174 | |
175 return length; | |
176 } | |
177 | |
178 public void writeDataTo(DataOutput dout) throws IOException { | |
179 if (mCodeBuffer == null) { | |
180 throw new NullPointerException("CodeAttr has no CodeBuffer set"); | |
181 } | |
182 | |
183 ExceptionHandler[] handlers = mCodeBuffer.getExceptionHandlers(); | |
184 | |
185 dout.writeShort(mCodeBuffer.getMaxStackDepth()); | |
186 dout.writeShort(mCodeBuffer.getMaxLocals()); | |
187 | |
188 byte[] byteCodes = mCodeBuffer.getByteCodes(); | |
189 dout.writeInt(byteCodes.length); | |
190 dout.write(byteCodes); | |
191 | |
192 if (handlers != null) { | |
193 int exceptionHandlerCount = handlers.length; | |
194 dout.writeShort(exceptionHandlerCount); | |
195 | |
196 for (int i=0; i<exceptionHandlerCount; i++) { | |
197 handlers[i].writeTo(dout); | |
198 } | |
199 } | |
200 else { | |
201 dout.writeShort(0); | |
202 } | |
203 | |
204 int size = mAttributes.size(); | |
205 dout.writeShort(size); | |
206 for (int i=0; i<size; i++) { | |
207 Attribute attr = (Attribute)mAttributes.get(i); | |
208 attr.writeTo(dout); | |
209 } | |
210 } | |
211 | |
212 static Attribute define(ConstantPool cp, | |
213 String name, | |
214 int length, | |
215 DataInput din, | |
216 AttributeFactory attrFactory) | |
217 throws IOException | |
218 { | |
219 CodeAttr code = new CodeAttr(cp); | |
220 | |
221 final int maxStackDepth = din.readUnsignedShort(); | |
222 final int maxLocals = din.readUnsignedShort(); | |
223 | |
224 final byte[] byteCodes = new byte[din.readInt()]; | |
225 din.readFully(byteCodes); | |
226 | |
227 int exceptionHandlerCount = din.readUnsignedShort(); | |
228 final ExceptionHandler[] handlers = | |
229 new ExceptionHandler[exceptionHandlerCount]; | |
230 | |
231 for (int i=0; i<exceptionHandlerCount; i++) { | |
232 handlers[i] = ExceptionHandler.readFrom(cp, din); | |
233 } | |
234 | |
235 code.mCodeBuffer = new CodeBuffer() { | |
236 public int getMaxStackDepth() { | |
237 return maxStackDepth; | |
238 } | |
239 | |
240 public int getMaxLocals() { | |
241 return maxLocals; | |
242 } | |
243 | |
244 public byte[] getByteCodes() { | |
245 return (byte[])byteCodes.clone(); | |
246 } | |
247 | |
248 public ExceptionHandler[] getExceptionHandlers() { | |
249 return (ExceptionHandler[])handlers.clone(); | |
250 } | |
251 }; | |
252 | |
253 int attributeCount = din.readUnsignedShort(); | |
254 for (int i=0; i<attributeCount; i++) { | |
255 code.addAttribute(Attribute.readFrom(cp, din, attrFactory)); | |
256 } | |
257 | |
258 return code; | |
259 } | |
260 } |