Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiGetLoadedClasses.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | d2a62e0f25eb |
| children | 070d523b96a7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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 | |
| 32 | |
| 33 // The closure for GetLoadedClasses and GetClassLoaderClasses | |
| 34 class JvmtiGetLoadedClassesClosure : public StackObj { | |
| 35 // Since the SystemDictionary::classes_do callback | |
| 36 // doesn't pass a closureData pointer, | |
| 37 // we use a thread-local slot to hold a pointer to | |
| 38 // a stack allocated instance of this structure. | |
| 39 private: | |
| 40 jobject _initiatingLoader; | |
| 41 int _count; | |
| 42 Handle* _list; | |
| 43 int _index; | |
| 44 | |
| 45 private: | |
| 46 // Getting and setting the thread local pointer | |
| 47 static JvmtiGetLoadedClassesClosure* get_this() { | |
| 48 JvmtiGetLoadedClassesClosure* result = NULL; | |
| 49 JavaThread* thread = JavaThread::current(); | |
| 50 result = thread->get_jvmti_get_loaded_classes_closure(); | |
| 51 return result; | |
| 52 } | |
| 53 static void set_this(JvmtiGetLoadedClassesClosure* that) { | |
| 54 JavaThread* thread = JavaThread::current(); | |
| 55 thread->set_jvmti_get_loaded_classes_closure(that); | |
| 56 } | |
| 57 | |
| 58 public: | |
| 59 // Constructor/Destructor | |
| 60 JvmtiGetLoadedClassesClosure() { | |
| 61 JvmtiGetLoadedClassesClosure* that = get_this(); | |
| 62 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); | |
| 63 _initiatingLoader = NULL; | |
| 64 _count = 0; | |
| 65 _list = NULL; | |
| 66 _index = 0; | |
| 67 set_this(this); | |
| 68 } | |
| 69 | |
| 70 JvmtiGetLoadedClassesClosure(jobject initiatingLoader) { | |
| 71 JvmtiGetLoadedClassesClosure* that = get_this(); | |
| 72 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); | |
| 73 _initiatingLoader = initiatingLoader; | |
| 74 _count = 0; | |
| 75 _list = NULL; | |
| 76 _index = 0; | |
| 77 set_this(this); | |
| 78 } | |
| 79 | |
| 80 ~JvmtiGetLoadedClassesClosure() { | |
| 81 JvmtiGetLoadedClassesClosure* that = get_this(); | |
| 82 assert(that != NULL, "JvmtiGetLoadedClassesClosure not found"); | |
| 83 set_this(NULL); | |
| 84 _initiatingLoader = NULL; | |
| 85 _count = 0; | |
| 86 if (_list != NULL) { | |
| 87 FreeHeap(_list); | |
| 88 _list = NULL; | |
| 89 } | |
| 90 _index = 0; | |
| 91 } | |
| 92 | |
| 93 // Accessors. | |
| 94 jobject get_initiatingLoader() { | |
| 95 return _initiatingLoader; | |
| 96 } | |
| 97 | |
| 98 int get_count() { | |
| 99 return _count; | |
| 100 } | |
| 101 | |
| 102 void set_count(int value) { | |
| 103 _count = value; | |
| 104 } | |
| 105 | |
| 106 Handle* get_list() { | |
| 107 return _list; | |
| 108 } | |
| 109 | |
| 110 void set_list(Handle* value) { | |
| 111 _list = value; | |
| 112 } | |
| 113 | |
| 114 int get_index() { | |
| 115 return _index; | |
| 116 } | |
| 117 | |
| 118 void set_index(int value) { | |
| 119 _index = value; | |
| 120 } | |
| 121 | |
| 122 Handle get_element(int index) { | |
| 123 if ((_list != NULL) && (index < _count)) { | |
| 124 return _list[index]; | |
| 125 } else { | |
| 126 assert(false, "empty get_element"); | |
| 127 return Handle(); | |
| 128 } | |
| 129 } | |
| 130 | |
| 131 void set_element(int index, Handle value) { | |
| 132 if ((_list != NULL) && (index < _count)) { | |
| 133 _list[index] = value; | |
| 134 } else { | |
| 135 assert(false, "bad set_element"); | |
| 136 } | |
| 137 } | |
| 138 | |
| 139 // Other predicates | |
| 140 bool available() { | |
| 141 return (_list != NULL); | |
| 142 } | |
| 143 | |
| 144 #ifdef ASSERT | |
| 145 // For debugging. | |
| 146 void check(int limit) { | |
| 147 for (int i = 0; i < limit; i += 1) { | |
| 148 assert(Universe::heap()->is_in(get_element(i)()), "check fails"); | |
| 149 } | |
| 150 } | |
| 151 #endif | |
| 152 | |
| 153 // Public methods that get called within the scope of the closure | |
| 154 void allocate() { | |
| 6197 | 155 _list = NEW_C_HEAP_ARRAY(Handle, _count, mtInternal); |
| 0 | 156 assert(_list != NULL, "Out of memory"); |
| 157 if (_list == NULL) { | |
| 158 _count = 0; | |
| 159 } | |
| 160 } | |
| 161 | |
| 162 void extract(JvmtiEnv *env, jclass* result) { | |
| 163 for (int index = 0; index < _count; index += 1) { | |
| 164 result[index] = (jclass) env->jni_reference(get_element(index)); | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 // Finally, the static methods that are the callbacks | |
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169 static void increment(Klass* k) { |
| 0 | 170 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 171 if (that->get_initiatingLoader() == NULL) { | |
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172 for (Klass* l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { |
| 0 | 173 that->set_count(that->get_count() + 1); |
| 174 } | |
| 175 } else if (k != NULL) { | |
| 176 // if initiating loader not null, just include the instance with 1 dimension | |
| 177 that->set_count(that->get_count() + 1); | |
| 178 } | |
| 179 } | |
| 180 | |
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181 static void increment_with_loader(Klass* k, ClassLoaderData* loader_data) { |
| 0 | 182 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
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183 oop class_loader = loader_data->class_loader(); |
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184 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
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185 for (Klass* l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { |
| 0 | 186 that->set_count(that->get_count() + 1); |
| 187 } | |
| 188 } | |
| 189 } | |
| 190 | |
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191 static void prim_array_increment_with_loader(Klass* array, ClassLoaderData* loader_data) { |
| 0 | 192 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
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193 oop class_loader = loader_data->class_loader(); |
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194 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
| 0 | 195 that->set_count(that->get_count() + 1); |
| 196 } | |
| 197 } | |
| 198 | |
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199 static void add(Klass* k) { |
| 0 | 200 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 201 if (that->available()) { | |
| 202 if (that->get_initiatingLoader() == NULL) { | |
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203 for (Klass* l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { |
| 0 | 204 oop mirror = Klass::cast(l)->java_mirror(); |
| 205 that->set_element(that->get_index(), mirror); | |
| 206 that->set_index(that->get_index() + 1); | |
| 207 } | |
| 208 } else if (k != NULL) { | |
| 209 // if initiating loader not null, just include the instance with 1 dimension | |
| 210 oop mirror = Klass::cast(k)->java_mirror(); | |
| 211 that->set_element(that->get_index(), mirror); | |
| 212 that->set_index(that->get_index() + 1); | |
| 213 } | |
| 214 } | |
| 215 } | |
| 216 | |
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217 static void add_with_loader(Klass* k, ClassLoaderData* loader_data) { |
| 0 | 218 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 219 if (that->available()) { | |
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220 oop class_loader = loader_data->class_loader(); |
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221 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
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222 for (Klass* l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { |
| 0 | 223 oop mirror = Klass::cast(l)->java_mirror(); |
| 224 that->set_element(that->get_index(), mirror); | |
| 225 that->set_index(that->get_index() + 1); | |
| 226 } | |
| 227 } | |
| 228 } | |
| 229 } | |
| 230 | |
| 231 // increment the count for the given basic type array class (and any | |
| 232 // multi-dimensional arrays). For example, for [B we check for | |
| 233 // [[B, [[[B, .. and the count is incremented for each one that exists. | |
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234 static void increment_for_basic_type_arrays(Klass* k) { |
| 0 | 235 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 236 assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); | |
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237 for (Klass* l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { |
| 0 | 238 that->set_count(that->get_count() + 1); |
| 239 } | |
| 240 } | |
| 241 | |
| 242 // add the basic type array class and its multi-dimensional array classes to the list | |
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243 static void add_for_basic_type_arrays(Klass* k) { |
| 0 | 244 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
| 245 assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); | |
| 246 assert(that->available(), "no list"); | |
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247 for (Klass* l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { |
| 0 | 248 oop mirror = Klass::cast(l)->java_mirror(); |
| 249 that->set_element(that->get_index(), mirror); | |
| 250 that->set_index(that->get_index() + 1); | |
| 251 } | |
| 252 } | |
| 253 }; | |
| 254 | |
| 255 | |
| 256 jvmtiError | |
| 257 JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) { | |
| 258 // Since SystemDictionary::classes_do only takes a function pointer | |
| 259 // and doesn't call back with a closure data pointer, | |
| 260 // we can only pass static methods. | |
| 261 | |
| 262 JvmtiGetLoadedClassesClosure closure; | |
| 263 { | |
| 264 // To get a consistent list of classes we need MultiArray_lock to ensure | |
| 265 // array classes aren't created, and SystemDictionary_lock to ensure that | |
| 266 // classes aren't added to the system dictionary, | |
| 267 MutexLocker ma(MultiArray_lock); | |
| 268 MutexLocker sd(SystemDictionary_lock); | |
| 269 | |
| 270 // First, count the classes | |
| 271 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment); | |
| 272 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment); | |
| 273 // Next, fill in the classes | |
| 274 closure.allocate(); | |
| 275 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add); | |
| 276 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add); | |
| 277 // Drop the SystemDictionary_lock, so the results could be wrong from here, | |
| 278 // but we still have a snapshot. | |
| 279 } | |
| 280 // Post results | |
| 281 jclass* result_list; | |
| 282 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), | |
| 283 (unsigned char**)&result_list); | |
| 284 if (err != JVMTI_ERROR_NONE) { | |
| 285 return err; | |
| 286 } | |
| 287 closure.extract(env, result_list); | |
| 288 *classCountPtr = closure.get_count(); | |
| 289 *classesPtr = result_list; | |
| 290 return JVMTI_ERROR_NONE; | |
| 291 } | |
| 292 | |
| 293 jvmtiError | |
| 294 JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader, | |
| 295 jint* classCountPtr, jclass** classesPtr) { | |
| 296 // Since SystemDictionary::classes_do only takes a function pointer | |
| 297 // and doesn't call back with a closure data pointer, | |
| 298 // we can only pass static methods. | |
| 299 JvmtiGetLoadedClassesClosure closure(initiatingLoader); | |
| 300 { | |
| 301 // To get a consistent list of classes we need MultiArray_lock to ensure | |
| 302 // array classes aren't created, and SystemDictionary_lock to ensure that | |
| 303 // classes aren't added to the system dictionary, | |
| 304 MutexLocker ma(MultiArray_lock); | |
| 305 MutexLocker sd(SystemDictionary_lock); | |
| 306 // First, count the classes in the system dictionary which have this loader recorded | |
| 307 // as an initiating loader. For basic type arrays this information is not recorded | |
| 308 // so GetClassLoaderClasses will return all of the basic type arrays. This is okay | |
| 309 // because the defining loader for basic type arrays is always the boot class loader | |
| 310 // and these classes are "visible" to all loaders. | |
| 311 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader); | |
| 312 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays); | |
| 313 // Next, fill in the classes | |
| 314 closure.allocate(); | |
| 315 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader); | |
| 316 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays); | |
| 317 // Drop the SystemDictionary_lock, so the results could be wrong from here, | |
| 318 // but we still have a snapshot. | |
| 319 } | |
| 320 // Post results | |
| 321 jclass* result_list; | |
| 322 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), | |
| 323 (unsigned char**)&result_list); | |
| 324 if (err != JVMTI_ERROR_NONE) { | |
| 325 return err; | |
| 326 } | |
| 327 closure.extract(env, result_list); | |
| 328 *classCountPtr = closure.get_count(); | |
| 329 *classesPtr = result_list; | |
| 330 return JVMTI_ERROR_NONE; | |
| 331 } |