Mercurial > lasercutter
comparison src/clojure/asm/Attribute.java @ 10:ef7dbbd6452c
added clojure source goodness
author | Robert McIntyre <rlm@mit.edu> |
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date | Sat, 21 Aug 2010 06:25:44 -0400 |
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9:35cf337adfcf | 10:ef7dbbd6452c |
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1 /*** | |
2 * ASM: a very small and fast Java bytecode manipulation framework | |
3 * Copyright (c) 2000-2005 INRIA, France Telecom | |
4 * All rights reserved. | |
5 * | |
6 * Redistribution and use in source and binary forms, with or without | |
7 * modification, are permitted provided that the following conditions | |
8 * are met: | |
9 * 1. Redistributions of source code must retain the above copyright | |
10 * notice, this list of conditions and the following disclaimer. | |
11 * 2. Redistributions in binary form must reproduce the above copyright | |
12 * notice, this list of conditions and the following disclaimer in the | |
13 * documentation and/or other materials provided with the distribution. | |
14 * 3. Neither the name of the copyright holders nor the names of its | |
15 * contributors may be used to endorse or promote products derived from | |
16 * this software without specific prior written permission. | |
17 * | |
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | |
28 * THE POSSIBILITY OF SUCH DAMAGE. | |
29 */ | |
30 package clojure.asm; | |
31 | |
32 /** | |
33 * A non standard class, field, method or code attribute. | |
34 * | |
35 * @author Eric Bruneton | |
36 * @author Eugene Kuleshov | |
37 */ | |
38 public class Attribute{ | |
39 | |
40 /** | |
41 * The type of this attribute. | |
42 */ | |
43 public final String type; | |
44 | |
45 /** | |
46 * The raw value of this attribute, used only for unknown attributes. | |
47 */ | |
48 byte[] value; | |
49 | |
50 /** | |
51 * The next attribute in this attribute list. May be <tt>null</tt>. | |
52 */ | |
53 Attribute next; | |
54 | |
55 /** | |
56 * Constructs a new empty attribute. | |
57 * | |
58 * @param type the type of the attribute. | |
59 */ | |
60 protected Attribute(final String type){ | |
61 this.type = type; | |
62 } | |
63 | |
64 /** | |
65 * Returns <tt>true</tt> if this type of attribute is unknown. The default | |
66 * implementation of this method always returns <tt>true</tt>. | |
67 * | |
68 * @return <tt>true</tt> if this type of attribute is unknown. | |
69 */ | |
70 public boolean isUnknown(){ | |
71 return true; | |
72 } | |
73 | |
74 /** | |
75 * Returns <tt>true</tt> if this type of attribute is a code attribute. | |
76 * | |
77 * @return <tt>true</tt> if this type of attribute is a code attribute. | |
78 */ | |
79 public boolean isCodeAttribute(){ | |
80 return false; | |
81 } | |
82 | |
83 /** | |
84 * Returns the labels corresponding to this attribute. | |
85 * | |
86 * @return the labels corresponding to this attribute, or <tt>null</tt> if | |
87 * this attribute is not a code attribute that contains labels. | |
88 */ | |
89 protected Label[] getLabels(){ | |
90 return null; | |
91 } | |
92 | |
93 /** | |
94 * Reads a {@link #type type} attribute. This method must return a <i>new</i> | |
95 * {@link Attribute} object, of type {@link #type type}, corresponding to | |
96 * the <tt>len</tt> bytes starting at the given offset, in the given class | |
97 * reader. | |
98 * | |
99 * @param cr the class that contains the attribute to be read. | |
100 * @param off index of the first byte of the attribute's content in {@link | |
101 * ClassReader#b cr.b}. The 6 attribute header bytes, containing the | |
102 * type and the length of the attribute, are not taken into account | |
103 * here. | |
104 * @param len the length of the attribute's content. | |
105 * @param buf buffer to be used to call | |
106 * {@link ClassReader#readUTF8 readUTF8}, | |
107 * {@link ClassReader#readClass(int,char[]) readClass} or | |
108 * {@link ClassReader#readConst readConst}. | |
109 * @param codeOff index of the first byte of code's attribute content in | |
110 * {@link ClassReader#b cr.b}, or -1 if the attribute to be read is | |
111 * not a code attribute. The 6 attribute header bytes, containing the | |
112 * type and the length of the attribute, are not taken into account | |
113 * here. | |
114 * @param labels the labels of the method's code, or <tt>null</tt> if the | |
115 * attribute to be read is not a code attribute. | |
116 * @return a <i>new</i> {@link Attribute} object corresponding to the given | |
117 * bytes. | |
118 */ | |
119 protected Attribute read( | |
120 final ClassReader cr, | |
121 final int off, | |
122 final int len, | |
123 final char[] buf, | |
124 final int codeOff, | |
125 final Label[] labels){ | |
126 Attribute attr = new Attribute(type); | |
127 attr.value = new byte[len]; | |
128 System.arraycopy(cr.b, off, attr.value, 0, len); | |
129 return attr; | |
130 } | |
131 | |
132 /** | |
133 * Returns the byte array form of this attribute. | |
134 * | |
135 * @param cw the class to which this attribute must be added. This parameter | |
136 * can be used to add to the constant pool of this class the items | |
137 * that corresponds to this attribute. | |
138 * @param code the bytecode of the method corresponding to this code | |
139 * attribute, or <tt>null</tt> if this attribute is not a code | |
140 * attributes. | |
141 * @param len the length of the bytecode of the method corresponding to this | |
142 * code attribute, or <tt>null</tt> if this attribute is not a code | |
143 * attribute. | |
144 * @param maxStack the maximum stack size of the method corresponding to | |
145 * this code attribute, or -1 if this attribute is not a code | |
146 * attribute. | |
147 * @param maxLocals the maximum number of local variables of the method | |
148 * corresponding to this code attribute, or -1 if this attribute is | |
149 * not a code attribute. | |
150 * @return the byte array form of this attribute. | |
151 */ | |
152 protected ByteVector write( | |
153 final ClassWriter cw, | |
154 final byte[] code, | |
155 final int len, | |
156 final int maxStack, | |
157 final int maxLocals){ | |
158 ByteVector v = new ByteVector(); | |
159 v.data = value; | |
160 v.length = value.length; | |
161 return v; | |
162 } | |
163 | |
164 /** | |
165 * Returns the length of the attribute list that begins with this attribute. | |
166 * | |
167 * @return the length of the attribute list that begins with this attribute. | |
168 */ | |
169 final int getCount(){ | |
170 int count = 0; | |
171 Attribute attr = this; | |
172 while(attr != null) | |
173 { | |
174 count += 1; | |
175 attr = attr.next; | |
176 } | |
177 return count; | |
178 } | |
179 | |
180 /** | |
181 * Returns the size of all the attributes in this attribute list. | |
182 * | |
183 * @param cw the class writer to be used to convert the attributes into byte | |
184 * arrays, with the {@link #write write} method. | |
185 * @param code the bytecode of the method corresponding to these code | |
186 * attributes, or <tt>null</tt> if these attributes are not code | |
187 * attributes. | |
188 * @param len the length of the bytecode of the method corresponding to | |
189 * these code attributes, or <tt>null</tt> if these attributes are | |
190 * not code attributes. | |
191 * @param maxStack the maximum stack size of the method corresponding to | |
192 * these code attributes, or -1 if these attributes are not code | |
193 * attributes. | |
194 * @param maxLocals the maximum number of local variables of the method | |
195 * corresponding to these code attributes, or -1 if these attributes | |
196 * are not code attributes. | |
197 * @return the size of all the attributes in this attribute list. This size | |
198 * includes the size of the attribute headers. | |
199 */ | |
200 final int getSize( | |
201 final ClassWriter cw, | |
202 final byte[] code, | |
203 final int len, | |
204 final int maxStack, | |
205 final int maxLocals){ | |
206 Attribute attr = this; | |
207 int size = 0; | |
208 while(attr != null) | |
209 { | |
210 cw.newUTF8(attr.type); | |
211 size += attr.write(cw, code, len, maxStack, maxLocals).length + 6; | |
212 attr = attr.next; | |
213 } | |
214 return size; | |
215 } | |
216 | |
217 /** | |
218 * Writes all the attributes of this attribute list in the given byte | |
219 * vector. | |
220 * | |
221 * @param cw the class writer to be used to convert the attributes into byte | |
222 * arrays, with the {@link #write write} method. | |
223 * @param code the bytecode of the method corresponding to these code | |
224 * attributes, or <tt>null</tt> if these attributes are not code | |
225 * attributes. | |
226 * @param len the length of the bytecode of the method corresponding to | |
227 * these code attributes, or <tt>null</tt> if these attributes are | |
228 * not code attributes. | |
229 * @param maxStack the maximum stack size of the method corresponding to | |
230 * these code attributes, or -1 if these attributes are not code | |
231 * attributes. | |
232 * @param maxLocals the maximum number of local variables of the method | |
233 * corresponding to these code attributes, or -1 if these attributes | |
234 * are not code attributes. | |
235 * @param out where the attributes must be written. | |
236 */ | |
237 final void put( | |
238 final ClassWriter cw, | |
239 final byte[] code, | |
240 final int len, | |
241 final int maxStack, | |
242 final int maxLocals, | |
243 final ByteVector out){ | |
244 Attribute attr = this; | |
245 while(attr != null) | |
246 { | |
247 ByteVector b = attr.write(cw, code, len, maxStack, maxLocals); | |
248 out.putShort(cw.newUTF8(attr.type)).putInt(b.length); | |
249 out.putByteArray(b.data, 0, b.length); | |
250 attr = attr.next; | |
251 } | |
252 } | |
253 } |