Mercurial > hg > truffle
annotate src/share/vm/prims/jvmtiGetLoadedClasses.cpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2003, 2013, 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 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/systemDictionary.hpp" | |
| 27 #include "memory/universe.inline.hpp" | |
| 28 #include "prims/jvmtiGetLoadedClasses.hpp" | |
| 29 #include "runtime/thread.hpp" | |
| 0 | 30 |
| 31 | |
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32 // The closure for GetLoadedClasses |
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33 class LoadedClassesClosure : public KlassClosure { |
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34 private: |
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35 Stack<jclass, mtInternal> _classStack; |
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36 JvmtiEnv* _env; |
| 0 | 37 |
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38 public: |
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39 LoadedClassesClosure(JvmtiEnv* env) { |
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40 _env = env; |
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41 } |
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42 |
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43 void do_klass(Klass* k) { |
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44 // Collect all jclasses |
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45 _classStack.push((jclass) _env->jni_reference(k->java_mirror())); |
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46 } |
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47 |
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48 int extract(jclass* result_list) { |
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49 // The size of the Stack will be 0 after extract, so get it here |
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50 int count = (int)_classStack.size(); |
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51 int i = count; |
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52 |
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53 // Pop all jclasses, fill backwards |
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54 while (!_classStack.is_empty()) { |
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55 result_list[--i] = _classStack.pop(); |
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56 } |
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57 |
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58 // Return the number of elements written |
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59 return count; |
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60 } |
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61 |
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62 // Return current size of the Stack |
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63 int get_count() { |
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64 return (int)_classStack.size(); |
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65 } |
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66 }; |
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67 |
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68 // The closure for GetClassLoaderClasses |
| 0 | 69 class JvmtiGetLoadedClassesClosure : public StackObj { |
| 70 // Since the SystemDictionary::classes_do callback | |
| 71 // doesn't pass a closureData pointer, | |
| 72 // we use a thread-local slot to hold a pointer to | |
| 73 // a stack allocated instance of this structure. | |
| 74 private: | |
| 75 jobject _initiatingLoader; | |
| 76 int _count; | |
| 77 Handle* _list; | |
| 78 int _index; | |
| 79 | |
| 80 private: | |
| 81 // Getting and setting the thread local pointer | |
| 82 static JvmtiGetLoadedClassesClosure* get_this() { | |
| 83 JvmtiGetLoadedClassesClosure* result = NULL; | |
| 84 JavaThread* thread = JavaThread::current(); | |
| 85 result = thread->get_jvmti_get_loaded_classes_closure(); | |
| 86 return result; | |
| 87 } | |
| 88 static void set_this(JvmtiGetLoadedClassesClosure* that) { | |
| 89 JavaThread* thread = JavaThread::current(); | |
| 90 thread->set_jvmti_get_loaded_classes_closure(that); | |
| 91 } | |
| 92 | |
| 93 public: | |
| 94 // Constructor/Destructor | |
| 95 JvmtiGetLoadedClassesClosure() { | |
| 96 JvmtiGetLoadedClassesClosure* that = get_this(); | |
| 97 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); | |
| 98 _initiatingLoader = NULL; | |
| 99 _count = 0; | |
| 100 _list = NULL; | |
| 101 _index = 0; | |
| 102 set_this(this); | |
| 103 } | |
| 104 | |
| 105 JvmtiGetLoadedClassesClosure(jobject initiatingLoader) { | |
| 106 JvmtiGetLoadedClassesClosure* that = get_this(); | |
| 107 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); | |
| 108 _initiatingLoader = initiatingLoader; | |
| 109 _count = 0; | |
| 110 _list = NULL; | |
| 111 _index = 0; | |
| 112 set_this(this); | |
| 113 } | |
| 114 | |
| 115 ~JvmtiGetLoadedClassesClosure() { | |
| 116 JvmtiGetLoadedClassesClosure* that = get_this(); | |
| 117 assert(that != NULL, "JvmtiGetLoadedClassesClosure not found"); | |
| 118 set_this(NULL); | |
| 119 _initiatingLoader = NULL; | |
| 120 _count = 0; | |
| 121 if (_list != NULL) { | |
| 122 FreeHeap(_list); | |
| 123 _list = NULL; | |
| 124 } | |
| 125 _index = 0; | |
| 126 } | |
| 127 | |
| 128 // Accessors. | |
| 129 jobject get_initiatingLoader() { | |
| 130 return _initiatingLoader; | |
| 131 } | |
| 132 | |
| 133 int get_count() { | |
| 134 return _count; | |
| 135 } | |
| 136 | |
| 137 void set_count(int value) { | |
| 138 _count = value; | |
| 139 } | |
| 140 | |
| 141 Handle* get_list() { | |
| 142 return _list; | |
| 143 } | |
| 144 | |
| 145 void set_list(Handle* value) { | |
| 146 _list = value; | |
| 147 } | |
| 148 | |
| 149 int get_index() { | |
| 150 return _index; | |
| 151 } | |
| 152 | |
| 153 void set_index(int value) { | |
| 154 _index = value; | |
| 155 } | |
| 156 | |
| 157 Handle get_element(int index) { | |
| 158 if ((_list != NULL) && (index < _count)) { | |
| 159 return _list[index]; | |
| 160 } else { | |
| 161 assert(false, "empty get_element"); | |
| 162 return Handle(); | |
| 163 } | |
| 164 } | |
| 165 | |
| 166 void set_element(int index, Handle value) { | |
| 167 if ((_list != NULL) && (index < _count)) { | |
| 168 _list[index] = value; | |
| 169 } else { | |
| 170 assert(false, "bad set_element"); | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 // Other predicates | |
| 175 bool available() { | |
| 176 return (_list != NULL); | |
| 177 } | |
| 178 | |
| 179 #ifdef ASSERT | |
| 180 // For debugging. | |
| 181 void check(int limit) { | |
| 182 for (int i = 0; i < limit; i += 1) { | |
| 183 assert(Universe::heap()->is_in(get_element(i)()), "check fails"); | |
| 184 } | |
| 185 } | |
| 186 #endif | |
| 187 | |
| 188 // Public methods that get called within the scope of the closure | |
| 189 void allocate() { | |
| 6197 | 190 _list = NEW_C_HEAP_ARRAY(Handle, _count, mtInternal); |
| 0 | 191 assert(_list != NULL, "Out of memory"); |
| 192 if (_list == NULL) { | |
| 193 _count = 0; | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 void extract(JvmtiEnv *env, jclass* result) { | |
| 198 for (int index = 0; index < _count; index += 1) { | |
| 199 result[index] = (jclass) env->jni_reference(get_element(index)); | |
| 200 } | |
| 201 } | |
| 202 | |
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203 static void increment_with_loader(Klass* k, ClassLoaderData* loader_data) { |
| 0 | 204 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
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205 oop class_loader = loader_data->class_loader(); |
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206 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
| 6983 | 207 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
| 0 | 208 that->set_count(that->get_count() + 1); |
| 209 } | |
| 210 } | |
| 211 } | |
| 212 | |
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213 static void prim_array_increment_with_loader(Klass* array, ClassLoaderData* loader_data) { |
| 0 | 214 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
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215 oop class_loader = loader_data->class_loader(); |
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216 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
| 0 | 217 that->set_count(that->get_count() + 1); |
| 218 } | |
| 219 } | |
| 220 | |
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221 static void add_with_loader(Klass* k, ClassLoaderData* loader_data) { |
| 0 | 222 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 223 if (that->available()) { | |
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224 oop class_loader = loader_data->class_loader(); |
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225 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
| 6983 | 226 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
| 227 oop mirror = l->java_mirror(); | |
| 0 | 228 that->set_element(that->get_index(), mirror); |
| 229 that->set_index(that->get_index() + 1); | |
| 230 } | |
| 231 } | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 // increment the count for the given basic type array class (and any | |
| 236 // multi-dimensional arrays). For example, for [B we check for | |
| 237 // [[B, [[[B, .. and the count is incremented for each one that exists. | |
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238 static void increment_for_basic_type_arrays(Klass* k) { |
| 0 | 239 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 240 assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); | |
| 6983 | 241 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
| 0 | 242 that->set_count(that->get_count() + 1); |
| 243 } | |
| 244 } | |
| 245 | |
| 246 // add the basic type array class and its multi-dimensional array classes to the list | |
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247 static void add_for_basic_type_arrays(Klass* k) { |
| 0 | 248 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 249 assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); | |
| 250 assert(that->available(), "no list"); | |
| 6983 | 251 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
| 252 oop mirror = l->java_mirror(); | |
| 0 | 253 that->set_element(that->get_index(), mirror); |
| 254 that->set_index(that->get_index() + 1); | |
| 255 } | |
| 256 } | |
| 257 }; | |
| 258 | |
| 259 | |
| 260 jvmtiError | |
| 261 JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) { | |
| 262 | |
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263 LoadedClassesClosure closure(env); |
| 0 | 264 { |
| 265 // To get a consistent list of classes we need MultiArray_lock to ensure | |
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266 // array classes aren't created. |
| 0 | 267 MutexLocker ma(MultiArray_lock); |
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268 |
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269 // Iterate through all classes in ClassLoaderDataGraph |
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270 // and collect them using the LoadedClassesClosure |
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271 ClassLoaderDataGraph::loaded_classes_do(&closure); |
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272 } |
| 0 | 273 |
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274 // Return results by extracting the collected contents into a list |
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275 // allocated via JvmtiEnv |
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276 jclass* result_list; |
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277 jvmtiError error = env->Allocate(closure.get_count() * sizeof(jclass), |
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278 (unsigned char**)&result_list); |
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279 |
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280 if (error == JVMTI_ERROR_NONE) { |
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281 int count = closure.extract(result_list); |
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282 *classCountPtr = count; |
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283 *classesPtr = result_list; |
| 0 | 284 } |
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285 return error; |
| 0 | 286 } |
| 287 | |
| 288 jvmtiError | |
| 289 JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader, | |
| 290 jint* classCountPtr, jclass** classesPtr) { | |
| 291 // Since SystemDictionary::classes_do only takes a function pointer | |
| 292 // and doesn't call back with a closure data pointer, | |
| 293 // we can only pass static methods. | |
| 294 JvmtiGetLoadedClassesClosure closure(initiatingLoader); | |
| 295 { | |
| 296 // To get a consistent list of classes we need MultiArray_lock to ensure | |
| 297 // array classes aren't created, and SystemDictionary_lock to ensure that | |
| 298 // classes aren't added to the system dictionary, | |
| 299 MutexLocker ma(MultiArray_lock); | |
| 300 MutexLocker sd(SystemDictionary_lock); | |
| 301 // First, count the classes in the system dictionary which have this loader recorded | |
| 302 // as an initiating loader. For basic type arrays this information is not recorded | |
| 303 // so GetClassLoaderClasses will return all of the basic type arrays. This is okay | |
| 304 // because the defining loader for basic type arrays is always the boot class loader | |
| 305 // and these classes are "visible" to all loaders. | |
| 306 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader); | |
| 307 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays); | |
| 308 // Next, fill in the classes | |
| 309 closure.allocate(); | |
| 310 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader); | |
| 311 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays); | |
| 312 // Drop the SystemDictionary_lock, so the results could be wrong from here, | |
| 313 // but we still have a snapshot. | |
| 314 } | |
| 315 // Post results | |
| 316 jclass* result_list; | |
| 317 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), | |
| 318 (unsigned char**)&result_list); | |
| 319 if (err != JVMTI_ERROR_NONE) { | |
| 320 return err; | |
| 321 } | |
| 322 closure.extract(env, result_list); | |
| 323 *classCountPtr = closure.get_count(); | |
| 324 *classesPtr = result_list; | |
| 325 return JVMTI_ERROR_NONE; | |
| 326 } |