Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiGetLoadedClasses.cpp @ 1768:6ee479178066
6979444: add command line option to print command line flags descriptions
Summary: Implementation of a nonproduct boolean flag XX:PrintFlagsWithComments
Reviewed-by: kamg, dholmes, dsamersoff
author | ikrylov |
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date | Tue, 31 Aug 2010 03:14:00 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 | |
26 # include "incls/_precompiled.incl" | |
27 # include "incls/_jvmtiGetLoadedClasses.cpp.incl" | |
28 | |
29 | |
30 // The closure for GetLoadedClasses and GetClassLoaderClasses | |
31 class JvmtiGetLoadedClassesClosure : public StackObj { | |
32 // Since the SystemDictionary::classes_do callback | |
33 // doesn't pass a closureData pointer, | |
34 // we use a thread-local slot to hold a pointer to | |
35 // a stack allocated instance of this structure. | |
36 private: | |
37 jobject _initiatingLoader; | |
38 int _count; | |
39 Handle* _list; | |
40 int _index; | |
41 | |
42 private: | |
43 // Getting and setting the thread local pointer | |
44 static JvmtiGetLoadedClassesClosure* get_this() { | |
45 JvmtiGetLoadedClassesClosure* result = NULL; | |
46 JavaThread* thread = JavaThread::current(); | |
47 result = thread->get_jvmti_get_loaded_classes_closure(); | |
48 return result; | |
49 } | |
50 static void set_this(JvmtiGetLoadedClassesClosure* that) { | |
51 JavaThread* thread = JavaThread::current(); | |
52 thread->set_jvmti_get_loaded_classes_closure(that); | |
53 } | |
54 | |
55 public: | |
56 // Constructor/Destructor | |
57 JvmtiGetLoadedClassesClosure() { | |
58 JvmtiGetLoadedClassesClosure* that = get_this(); | |
59 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); | |
60 _initiatingLoader = NULL; | |
61 _count = 0; | |
62 _list = NULL; | |
63 _index = 0; | |
64 set_this(this); | |
65 } | |
66 | |
67 JvmtiGetLoadedClassesClosure(jobject initiatingLoader) { | |
68 JvmtiGetLoadedClassesClosure* that = get_this(); | |
69 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); | |
70 _initiatingLoader = initiatingLoader; | |
71 _count = 0; | |
72 _list = NULL; | |
73 _index = 0; | |
74 set_this(this); | |
75 } | |
76 | |
77 ~JvmtiGetLoadedClassesClosure() { | |
78 JvmtiGetLoadedClassesClosure* that = get_this(); | |
79 assert(that != NULL, "JvmtiGetLoadedClassesClosure not found"); | |
80 set_this(NULL); | |
81 _initiatingLoader = NULL; | |
82 _count = 0; | |
83 if (_list != NULL) { | |
84 FreeHeap(_list); | |
85 _list = NULL; | |
86 } | |
87 _index = 0; | |
88 } | |
89 | |
90 // Accessors. | |
91 jobject get_initiatingLoader() { | |
92 return _initiatingLoader; | |
93 } | |
94 | |
95 int get_count() { | |
96 return _count; | |
97 } | |
98 | |
99 void set_count(int value) { | |
100 _count = value; | |
101 } | |
102 | |
103 Handle* get_list() { | |
104 return _list; | |
105 } | |
106 | |
107 void set_list(Handle* value) { | |
108 _list = value; | |
109 } | |
110 | |
111 int get_index() { | |
112 return _index; | |
113 } | |
114 | |
115 void set_index(int value) { | |
116 _index = value; | |
117 } | |
118 | |
119 Handle get_element(int index) { | |
120 if ((_list != NULL) && (index < _count)) { | |
121 return _list[index]; | |
122 } else { | |
123 assert(false, "empty get_element"); | |
124 return Handle(); | |
125 } | |
126 } | |
127 | |
128 void set_element(int index, Handle value) { | |
129 if ((_list != NULL) && (index < _count)) { | |
130 _list[index] = value; | |
131 } else { | |
132 assert(false, "bad set_element"); | |
133 } | |
134 } | |
135 | |
136 // Other predicates | |
137 bool available() { | |
138 return (_list != NULL); | |
139 } | |
140 | |
141 #ifdef ASSERT | |
142 // For debugging. | |
143 void check(int limit) { | |
144 for (int i = 0; i < limit; i += 1) { | |
145 assert(Universe::heap()->is_in(get_element(i)()), "check fails"); | |
146 } | |
147 } | |
148 #endif | |
149 | |
150 // Public methods that get called within the scope of the closure | |
151 void allocate() { | |
152 _list = NEW_C_HEAP_ARRAY(Handle, _count); | |
153 assert(_list != NULL, "Out of memory"); | |
154 if (_list == NULL) { | |
155 _count = 0; | |
156 } | |
157 } | |
158 | |
159 void extract(JvmtiEnv *env, jclass* result) { | |
160 for (int index = 0; index < _count; index += 1) { | |
161 result[index] = (jclass) env->jni_reference(get_element(index)); | |
162 } | |
163 } | |
164 | |
165 // Finally, the static methods that are the callbacks | |
166 static void increment(klassOop k) { | |
167 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); | |
168 if (that->get_initiatingLoader() == NULL) { | |
169 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { | |
170 that->set_count(that->get_count() + 1); | |
171 } | |
172 } else if (k != NULL) { | |
173 // if initiating loader not null, just include the instance with 1 dimension | |
174 that->set_count(that->get_count() + 1); | |
175 } | |
176 } | |
177 | |
178 static void increment_with_loader(klassOop k, oop loader) { | |
179 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); | |
180 if (loader == JNIHandles::resolve(that->get_initiatingLoader())) { | |
181 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { | |
182 that->set_count(that->get_count() + 1); | |
183 } | |
184 } | |
185 } | |
186 | |
187 static void prim_array_increment_with_loader(klassOop array, oop loader) { | |
188 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); | |
189 if (loader == JNIHandles::resolve(that->get_initiatingLoader())) { | |
190 that->set_count(that->get_count() + 1); | |
191 } | |
192 } | |
193 | |
194 static void add(klassOop k) { | |
195 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); | |
196 if (that->available()) { | |
197 if (that->get_initiatingLoader() == NULL) { | |
198 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { | |
199 oop mirror = Klass::cast(l)->java_mirror(); | |
200 that->set_element(that->get_index(), mirror); | |
201 that->set_index(that->get_index() + 1); | |
202 } | |
203 } else if (k != NULL) { | |
204 // if initiating loader not null, just include the instance with 1 dimension | |
205 oop mirror = Klass::cast(k)->java_mirror(); | |
206 that->set_element(that->get_index(), mirror); | |
207 that->set_index(that->get_index() + 1); | |
208 } | |
209 } | |
210 } | |
211 | |
212 static void add_with_loader(klassOop k, oop loader) { | |
213 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); | |
214 if (that->available()) { | |
215 if (loader == JNIHandles::resolve(that->get_initiatingLoader())) { | |
216 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { | |
217 oop mirror = Klass::cast(l)->java_mirror(); | |
218 that->set_element(that->get_index(), mirror); | |
219 that->set_index(that->get_index() + 1); | |
220 } | |
221 } | |
222 } | |
223 } | |
224 | |
225 // increment the count for the given basic type array class (and any | |
226 // multi-dimensional arrays). For example, for [B we check for | |
227 // [[B, [[[B, .. and the count is incremented for each one that exists. | |
228 static void increment_for_basic_type_arrays(klassOop k) { | |
229 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); | |
230 assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); | |
231 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { | |
232 that->set_count(that->get_count() + 1); | |
233 } | |
234 } | |
235 | |
236 // add the basic type array class and its multi-dimensional array classes to the list | |
237 static void add_for_basic_type_arrays(klassOop k) { | |
238 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); | |
239 assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); | |
240 assert(that->available(), "no list"); | |
241 for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { | |
242 oop mirror = Klass::cast(l)->java_mirror(); | |
243 that->set_element(that->get_index(), mirror); | |
244 that->set_index(that->get_index() + 1); | |
245 } | |
246 } | |
247 }; | |
248 | |
249 | |
250 jvmtiError | |
251 JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) { | |
252 // Since SystemDictionary::classes_do only takes a function pointer | |
253 // and doesn't call back with a closure data pointer, | |
254 // we can only pass static methods. | |
255 | |
256 JvmtiGetLoadedClassesClosure closure; | |
257 { | |
258 // To get a consistent list of classes we need MultiArray_lock to ensure | |
259 // array classes aren't created, and SystemDictionary_lock to ensure that | |
260 // classes aren't added to the system dictionary, | |
261 MutexLocker ma(MultiArray_lock); | |
262 MutexLocker sd(SystemDictionary_lock); | |
263 | |
264 // First, count the classes | |
265 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment); | |
266 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment); | |
267 // Next, fill in the classes | |
268 closure.allocate(); | |
269 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add); | |
270 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add); | |
271 // Drop the SystemDictionary_lock, so the results could be wrong from here, | |
272 // but we still have a snapshot. | |
273 } | |
274 // Post results | |
275 jclass* result_list; | |
276 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), | |
277 (unsigned char**)&result_list); | |
278 if (err != JVMTI_ERROR_NONE) { | |
279 return err; | |
280 } | |
281 closure.extract(env, result_list); | |
282 *classCountPtr = closure.get_count(); | |
283 *classesPtr = result_list; | |
284 return JVMTI_ERROR_NONE; | |
285 } | |
286 | |
287 jvmtiError | |
288 JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader, | |
289 jint* classCountPtr, jclass** classesPtr) { | |
290 // Since SystemDictionary::classes_do only takes a function pointer | |
291 // and doesn't call back with a closure data pointer, | |
292 // we can only pass static methods. | |
293 JvmtiGetLoadedClassesClosure closure(initiatingLoader); | |
294 { | |
295 // To get a consistent list of classes we need MultiArray_lock to ensure | |
296 // array classes aren't created, and SystemDictionary_lock to ensure that | |
297 // classes aren't added to the system dictionary, | |
298 MutexLocker ma(MultiArray_lock); | |
299 MutexLocker sd(SystemDictionary_lock); | |
300 // First, count the classes in the system dictionary which have this loader recorded | |
301 // as an initiating loader. For basic type arrays this information is not recorded | |
302 // so GetClassLoaderClasses will return all of the basic type arrays. This is okay | |
303 // because the defining loader for basic type arrays is always the boot class loader | |
304 // and these classes are "visible" to all loaders. | |
305 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader); | |
306 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays); | |
307 // Next, fill in the classes | |
308 closure.allocate(); | |
309 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader); | |
310 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays); | |
311 // Drop the SystemDictionary_lock, so the results could be wrong from here, | |
312 // but we still have a snapshot. | |
313 } | |
314 // Post results | |
315 jclass* result_list; | |
316 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), | |
317 (unsigned char**)&result_list); | |
318 if (err != JVMTI_ERROR_NONE) { | |
319 return err; | |
320 } | |
321 closure.extract(env, result_list); | |
322 *classCountPtr = closure.get_count(); | |
323 *classesPtr = result_list; | |
324 return JVMTI_ERROR_NONE; | |
325 } |