Mon, 15 Oct 2018 14:58:52 +0100
Merge
duke@435 | 1 | /* |
poonam@9195 | 2 | * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "classfile/systemDictionary.hpp" |
stefank@2314 | 27 | #include "memory/universe.inline.hpp" |
stefank@2314 | 28 | #include "prims/jvmtiGetLoadedClasses.hpp" |
stefank@2314 | 29 | #include "runtime/thread.hpp" |
poonam@9195 | 30 | #if INCLUDE_ALL_GCS |
poonam@9195 | 31 | #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp" |
poonam@9195 | 32 | #endif |
duke@435 | 33 | |
duke@435 | 34 | |
farvidsson@6024 | 35 | // The closure for GetLoadedClasses |
farvidsson@6024 | 36 | class LoadedClassesClosure : public KlassClosure { |
farvidsson@6024 | 37 | private: |
farvidsson@6024 | 38 | Stack<jclass, mtInternal> _classStack; |
farvidsson@6024 | 39 | JvmtiEnv* _env; |
duke@435 | 40 | |
poonam@9195 | 41 | // Tell the GC to keep this klass alive |
poonam@9195 | 42 | static void ensure_klass_alive(oop o) { |
poonam@9195 | 43 | // A klass that was previously considered dead can be looked up in the |
poonam@9195 | 44 | // CLD/SD, and its _java_mirror or _class_loader can be stored in a root |
poonam@9195 | 45 | // or a reachable object making it alive again. The SATB part of G1 needs |
poonam@9195 | 46 | // to get notified about this potential resurrection, otherwise the marking |
poonam@9195 | 47 | // might not find the object. |
poonam@9195 | 48 | #if INCLUDE_ALL_GCS |
poonam@9195 | 49 | if (UseG1GC && o != NULL) { |
poonam@9195 | 50 | G1SATBCardTableModRefBS::enqueue(o); |
poonam@9195 | 51 | } |
poonam@9195 | 52 | #endif |
poonam@9195 | 53 | } |
poonam@9195 | 54 | |
farvidsson@6024 | 55 | public: |
farvidsson@6024 | 56 | LoadedClassesClosure(JvmtiEnv* env) { |
farvidsson@6024 | 57 | _env = env; |
farvidsson@6024 | 58 | } |
farvidsson@6024 | 59 | |
farvidsson@6024 | 60 | void do_klass(Klass* k) { |
farvidsson@6024 | 61 | // Collect all jclasses |
farvidsson@6024 | 62 | _classStack.push((jclass) _env->jni_reference(k->java_mirror())); |
poonam@9195 | 63 | ensure_klass_alive(k->java_mirror()); |
farvidsson@6024 | 64 | } |
farvidsson@6024 | 65 | |
farvidsson@6024 | 66 | int extract(jclass* result_list) { |
farvidsson@6024 | 67 | // The size of the Stack will be 0 after extract, so get it here |
farvidsson@6024 | 68 | int count = (int)_classStack.size(); |
farvidsson@6024 | 69 | int i = count; |
farvidsson@6024 | 70 | |
farvidsson@6024 | 71 | // Pop all jclasses, fill backwards |
farvidsson@6024 | 72 | while (!_classStack.is_empty()) { |
farvidsson@6024 | 73 | result_list[--i] = _classStack.pop(); |
farvidsson@6024 | 74 | } |
farvidsson@6024 | 75 | |
farvidsson@6024 | 76 | // Return the number of elements written |
farvidsson@6024 | 77 | return count; |
farvidsson@6024 | 78 | } |
farvidsson@6024 | 79 | |
farvidsson@6024 | 80 | // Return current size of the Stack |
farvidsson@6024 | 81 | int get_count() { |
farvidsson@6024 | 82 | return (int)_classStack.size(); |
farvidsson@6024 | 83 | } |
farvidsson@6024 | 84 | }; |
farvidsson@6024 | 85 | |
farvidsson@6024 | 86 | // The closure for GetClassLoaderClasses |
duke@435 | 87 | class JvmtiGetLoadedClassesClosure : public StackObj { |
duke@435 | 88 | // Since the SystemDictionary::classes_do callback |
duke@435 | 89 | // doesn't pass a closureData pointer, |
duke@435 | 90 | // we use a thread-local slot to hold a pointer to |
duke@435 | 91 | // a stack allocated instance of this structure. |
duke@435 | 92 | private: |
duke@435 | 93 | jobject _initiatingLoader; |
duke@435 | 94 | int _count; |
duke@435 | 95 | Handle* _list; |
duke@435 | 96 | int _index; |
duke@435 | 97 | |
duke@435 | 98 | private: |
duke@435 | 99 | // Getting and setting the thread local pointer |
duke@435 | 100 | static JvmtiGetLoadedClassesClosure* get_this() { |
duke@435 | 101 | JvmtiGetLoadedClassesClosure* result = NULL; |
duke@435 | 102 | JavaThread* thread = JavaThread::current(); |
duke@435 | 103 | result = thread->get_jvmti_get_loaded_classes_closure(); |
duke@435 | 104 | return result; |
duke@435 | 105 | } |
duke@435 | 106 | static void set_this(JvmtiGetLoadedClassesClosure* that) { |
duke@435 | 107 | JavaThread* thread = JavaThread::current(); |
duke@435 | 108 | thread->set_jvmti_get_loaded_classes_closure(that); |
duke@435 | 109 | } |
duke@435 | 110 | |
duke@435 | 111 | public: |
duke@435 | 112 | // Constructor/Destructor |
duke@435 | 113 | JvmtiGetLoadedClassesClosure() { |
duke@435 | 114 | JvmtiGetLoadedClassesClosure* that = get_this(); |
duke@435 | 115 | assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); |
duke@435 | 116 | _initiatingLoader = NULL; |
duke@435 | 117 | _count = 0; |
duke@435 | 118 | _list = NULL; |
duke@435 | 119 | _index = 0; |
duke@435 | 120 | set_this(this); |
duke@435 | 121 | } |
duke@435 | 122 | |
duke@435 | 123 | JvmtiGetLoadedClassesClosure(jobject initiatingLoader) { |
duke@435 | 124 | JvmtiGetLoadedClassesClosure* that = get_this(); |
duke@435 | 125 | assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); |
duke@435 | 126 | _initiatingLoader = initiatingLoader; |
duke@435 | 127 | _count = 0; |
duke@435 | 128 | _list = NULL; |
duke@435 | 129 | _index = 0; |
duke@435 | 130 | set_this(this); |
duke@435 | 131 | } |
duke@435 | 132 | |
duke@435 | 133 | ~JvmtiGetLoadedClassesClosure() { |
duke@435 | 134 | JvmtiGetLoadedClassesClosure* that = get_this(); |
duke@435 | 135 | assert(that != NULL, "JvmtiGetLoadedClassesClosure not found"); |
duke@435 | 136 | set_this(NULL); |
duke@435 | 137 | _initiatingLoader = NULL; |
duke@435 | 138 | _count = 0; |
duke@435 | 139 | if (_list != NULL) { |
duke@435 | 140 | FreeHeap(_list); |
duke@435 | 141 | _list = NULL; |
duke@435 | 142 | } |
duke@435 | 143 | _index = 0; |
duke@435 | 144 | } |
duke@435 | 145 | |
duke@435 | 146 | // Accessors. |
duke@435 | 147 | jobject get_initiatingLoader() { |
duke@435 | 148 | return _initiatingLoader; |
duke@435 | 149 | } |
duke@435 | 150 | |
duke@435 | 151 | int get_count() { |
duke@435 | 152 | return _count; |
duke@435 | 153 | } |
duke@435 | 154 | |
duke@435 | 155 | void set_count(int value) { |
duke@435 | 156 | _count = value; |
duke@435 | 157 | } |
duke@435 | 158 | |
duke@435 | 159 | Handle* get_list() { |
duke@435 | 160 | return _list; |
duke@435 | 161 | } |
duke@435 | 162 | |
duke@435 | 163 | void set_list(Handle* value) { |
duke@435 | 164 | _list = value; |
duke@435 | 165 | } |
duke@435 | 166 | |
duke@435 | 167 | int get_index() { |
duke@435 | 168 | return _index; |
duke@435 | 169 | } |
duke@435 | 170 | |
duke@435 | 171 | void set_index(int value) { |
duke@435 | 172 | _index = value; |
duke@435 | 173 | } |
duke@435 | 174 | |
duke@435 | 175 | Handle get_element(int index) { |
duke@435 | 176 | if ((_list != NULL) && (index < _count)) { |
duke@435 | 177 | return _list[index]; |
duke@435 | 178 | } else { |
duke@435 | 179 | assert(false, "empty get_element"); |
duke@435 | 180 | return Handle(); |
duke@435 | 181 | } |
duke@435 | 182 | } |
duke@435 | 183 | |
duke@435 | 184 | void set_element(int index, Handle value) { |
duke@435 | 185 | if ((_list != NULL) && (index < _count)) { |
duke@435 | 186 | _list[index] = value; |
duke@435 | 187 | } else { |
duke@435 | 188 | assert(false, "bad set_element"); |
duke@435 | 189 | } |
duke@435 | 190 | } |
duke@435 | 191 | |
duke@435 | 192 | // Other predicates |
duke@435 | 193 | bool available() { |
duke@435 | 194 | return (_list != NULL); |
duke@435 | 195 | } |
duke@435 | 196 | |
duke@435 | 197 | #ifdef ASSERT |
duke@435 | 198 | // For debugging. |
duke@435 | 199 | void check(int limit) { |
duke@435 | 200 | for (int i = 0; i < limit; i += 1) { |
duke@435 | 201 | assert(Universe::heap()->is_in(get_element(i)()), "check fails"); |
duke@435 | 202 | } |
duke@435 | 203 | } |
duke@435 | 204 | #endif |
duke@435 | 205 | |
duke@435 | 206 | // Public methods that get called within the scope of the closure |
duke@435 | 207 | void allocate() { |
zgu@3900 | 208 | _list = NEW_C_HEAP_ARRAY(Handle, _count, mtInternal); |
duke@435 | 209 | assert(_list != NULL, "Out of memory"); |
duke@435 | 210 | if (_list == NULL) { |
duke@435 | 211 | _count = 0; |
duke@435 | 212 | } |
duke@435 | 213 | } |
duke@435 | 214 | |
duke@435 | 215 | void extract(JvmtiEnv *env, jclass* result) { |
duke@435 | 216 | for (int index = 0; index < _count; index += 1) { |
duke@435 | 217 | result[index] = (jclass) env->jni_reference(get_element(index)); |
duke@435 | 218 | } |
duke@435 | 219 | } |
duke@435 | 220 | |
coleenp@4037 | 221 | static void increment_with_loader(Klass* k, ClassLoaderData* loader_data) { |
duke@435 | 222 | JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
coleenp@4037 | 223 | oop class_loader = loader_data->class_loader(); |
coleenp@4037 | 224 | if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
hseigel@4278 | 225 | for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
duke@435 | 226 | that->set_count(that->get_count() + 1); |
duke@435 | 227 | } |
duke@435 | 228 | } |
duke@435 | 229 | } |
duke@435 | 230 | |
coleenp@4037 | 231 | static void prim_array_increment_with_loader(Klass* array, ClassLoaderData* loader_data) { |
duke@435 | 232 | JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
coleenp@4037 | 233 | oop class_loader = loader_data->class_loader(); |
coleenp@4037 | 234 | if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
duke@435 | 235 | that->set_count(that->get_count() + 1); |
duke@435 | 236 | } |
duke@435 | 237 | } |
duke@435 | 238 | |
coleenp@4037 | 239 | static void add_with_loader(Klass* k, ClassLoaderData* loader_data) { |
duke@435 | 240 | JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
duke@435 | 241 | if (that->available()) { |
coleenp@4037 | 242 | oop class_loader = loader_data->class_loader(); |
coleenp@4037 | 243 | if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) { |
hseigel@4278 | 244 | for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
hseigel@4278 | 245 | oop mirror = l->java_mirror(); |
duke@435 | 246 | that->set_element(that->get_index(), mirror); |
duke@435 | 247 | that->set_index(that->get_index() + 1); |
duke@435 | 248 | } |
duke@435 | 249 | } |
duke@435 | 250 | } |
duke@435 | 251 | } |
duke@435 | 252 | |
duke@435 | 253 | // increment the count for the given basic type array class (and any |
duke@435 | 254 | // multi-dimensional arrays). For example, for [B we check for |
duke@435 | 255 | // [[B, [[[B, .. and the count is incremented for each one that exists. |
coleenp@4037 | 256 | static void increment_for_basic_type_arrays(Klass* k) { |
duke@435 | 257 | JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
duke@435 | 258 | assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); |
hseigel@4278 | 259 | for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
duke@435 | 260 | that->set_count(that->get_count() + 1); |
duke@435 | 261 | } |
duke@435 | 262 | } |
duke@435 | 263 | |
duke@435 | 264 | // add the basic type array class and its multi-dimensional array classes to the list |
coleenp@4037 | 265 | static void add_for_basic_type_arrays(Klass* k) { |
duke@435 | 266 | JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); |
duke@435 | 267 | assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); |
duke@435 | 268 | assert(that->available(), "no list"); |
hseigel@4278 | 269 | for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) { |
hseigel@4278 | 270 | oop mirror = l->java_mirror(); |
duke@435 | 271 | that->set_element(that->get_index(), mirror); |
duke@435 | 272 | that->set_index(that->get_index() + 1); |
duke@435 | 273 | } |
duke@435 | 274 | } |
duke@435 | 275 | }; |
duke@435 | 276 | |
duke@435 | 277 | |
duke@435 | 278 | jvmtiError |
duke@435 | 279 | JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) { |
duke@435 | 280 | |
farvidsson@6024 | 281 | LoadedClassesClosure closure(env); |
duke@435 | 282 | { |
duke@435 | 283 | // To get a consistent list of classes we need MultiArray_lock to ensure |
farvidsson@6024 | 284 | // array classes aren't created. |
duke@435 | 285 | MutexLocker ma(MultiArray_lock); |
duke@435 | 286 | |
farvidsson@6024 | 287 | // Iterate through all classes in ClassLoaderDataGraph |
farvidsson@6024 | 288 | // and collect them using the LoadedClassesClosure |
farvidsson@6024 | 289 | ClassLoaderDataGraph::loaded_classes_do(&closure); |
duke@435 | 290 | } |
farvidsson@6024 | 291 | |
farvidsson@6024 | 292 | // Return results by extracting the collected contents into a list |
farvidsson@6024 | 293 | // allocated via JvmtiEnv |
duke@435 | 294 | jclass* result_list; |
farvidsson@6024 | 295 | jvmtiError error = env->Allocate(closure.get_count() * sizeof(jclass), |
farvidsson@6024 | 296 | (unsigned char**)&result_list); |
farvidsson@6024 | 297 | |
farvidsson@6024 | 298 | if (error == JVMTI_ERROR_NONE) { |
farvidsson@6024 | 299 | int count = closure.extract(result_list); |
farvidsson@6024 | 300 | *classCountPtr = count; |
farvidsson@6024 | 301 | *classesPtr = result_list; |
duke@435 | 302 | } |
farvidsson@6024 | 303 | return error; |
duke@435 | 304 | } |
duke@435 | 305 | |
duke@435 | 306 | jvmtiError |
duke@435 | 307 | JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader, |
duke@435 | 308 | jint* classCountPtr, jclass** classesPtr) { |
duke@435 | 309 | // Since SystemDictionary::classes_do only takes a function pointer |
duke@435 | 310 | // and doesn't call back with a closure data pointer, |
duke@435 | 311 | // we can only pass static methods. |
duke@435 | 312 | JvmtiGetLoadedClassesClosure closure(initiatingLoader); |
duke@435 | 313 | { |
duke@435 | 314 | // To get a consistent list of classes we need MultiArray_lock to ensure |
duke@435 | 315 | // array classes aren't created, and SystemDictionary_lock to ensure that |
duke@435 | 316 | // classes aren't added to the system dictionary, |
duke@435 | 317 | MutexLocker ma(MultiArray_lock); |
duke@435 | 318 | MutexLocker sd(SystemDictionary_lock); |
duke@435 | 319 | // First, count the classes in the system dictionary which have this loader recorded |
duke@435 | 320 | // as an initiating loader. For basic type arrays this information is not recorded |
duke@435 | 321 | // so GetClassLoaderClasses will return all of the basic type arrays. This is okay |
duke@435 | 322 | // because the defining loader for basic type arrays is always the boot class loader |
duke@435 | 323 | // and these classes are "visible" to all loaders. |
duke@435 | 324 | SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader); |
duke@435 | 325 | Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays); |
duke@435 | 326 | // Next, fill in the classes |
duke@435 | 327 | closure.allocate(); |
duke@435 | 328 | SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader); |
duke@435 | 329 | Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays); |
duke@435 | 330 | // Drop the SystemDictionary_lock, so the results could be wrong from here, |
duke@435 | 331 | // but we still have a snapshot. |
duke@435 | 332 | } |
duke@435 | 333 | // Post results |
duke@435 | 334 | jclass* result_list; |
duke@435 | 335 | jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), |
duke@435 | 336 | (unsigned char**)&result_list); |
duke@435 | 337 | if (err != JVMTI_ERROR_NONE) { |
duke@435 | 338 | return err; |
duke@435 | 339 | } |
duke@435 | 340 | closure.extract(env, result_list); |
duke@435 | 341 | *classCountPtr = closure.get_count(); |
duke@435 | 342 | *classesPtr = result_list; |
duke@435 | 343 | return JVMTI_ERROR_NONE; |
duke@435 | 344 | } |