| /* |
| * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/dictionary.hpp" |
| #include "classfile/classLoaderData.inline.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "gc/shared/collectedHeap.hpp" |
| #include "memory/universe.hpp" |
| #include "prims/jvmtiGetLoadedClasses.hpp" |
| #include "runtime/handles.inline.hpp" |
| #include "runtime/jniHandles.inline.hpp" |
| #include "runtime/thread.hpp" |
| #include "utilities/stack.inline.hpp" |
| |
| // The closure for GetLoadedClasses |
| class LoadedClassesClosure : public KlassClosure { |
| private: |
| Stack<jclass, mtInternal> _classStack; |
| JvmtiEnv* _env; |
| Thread* _cur_thread; |
| bool _dictionary_walk; |
| |
| int extract(jclass* result_list) { |
| // The size of the Stack will be 0 after extract, so get it here |
| int count = (int)_classStack.size(); |
| int i = count; |
| |
| // Pop all jclasses, fill backwards |
| while (!_classStack.is_empty()) { |
| result_list[--i] = _classStack.pop(); |
| } |
| |
| // Return the number of elements written |
| return count; |
| } |
| |
| // Return current size of the Stack |
| int get_count() { |
| return (int)_classStack.size(); |
| } |
| |
| public: |
| LoadedClassesClosure(JvmtiEnv* env, bool dictionary_walk) : |
| _env(env), |
| _cur_thread(Thread::current()), |
| _dictionary_walk(dictionary_walk) { |
| } |
| |
| void do_klass(Klass* k) { |
| // Collect all jclasses |
| _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, k->java_mirror()))); |
| if (_dictionary_walk) { |
| // Collect array classes this way when walking the dictionary (because array classes are |
| // not in the dictionary). |
| for (Klass* l = k->array_klass_or_null(); l != NULL; l = l->array_klass_or_null()) { |
| _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, l->java_mirror()))); |
| } |
| } |
| } |
| |
| jvmtiError get_result(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) { |
| // Return results by extracting the collected contents into a list |
| // allocated via JvmtiEnv |
| jclass* result_list; |
| jvmtiError error = env->Allocate(get_count() * sizeof(jclass), |
| (unsigned char**)&result_list); |
| |
| if (error == JVMTI_ERROR_NONE) { |
| int count = extract(result_list); |
| *classCountPtr = count; |
| *classesPtr = result_list; |
| } |
| return error; |
| } |
| }; |
| |
| jvmtiError |
| JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) { |
| |
| LoadedClassesClosure closure(env, false); |
| { |
| // To get a consistent list of classes we need MultiArray_lock to ensure |
| // array classes aren't created. |
| MutexLocker ma(MultiArray_lock); |
| |
| // Iterate through all classes in ClassLoaderDataGraph |
| // and collect them using the LoadedClassesClosure |
| MutexLocker mcld(ClassLoaderDataGraph_lock); |
| ClassLoaderDataGraph::loaded_classes_do(&closure); |
| } |
| |
| return closure.get_result(env, classCountPtr, classesPtr); |
| } |
| |
| jvmtiError |
| JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader, |
| jint* classCountPtr, jclass** classesPtr) { |
| |
| LoadedClassesClosure closure(env, true); |
| { |
| // To get a consistent list of classes we need MultiArray_lock to ensure |
| // array classes aren't created during this walk. |
| MutexLocker ma(MultiArray_lock); |
| MutexLocker sd(SystemDictionary_lock); |
| oop loader = JNIHandles::resolve(initiatingLoader); |
| // All classes loaded from this loader as initiating loader are |
| // requested, so only need to walk this loader's ClassLoaderData |
| // dictionary, or the NULL ClassLoaderData dictionary for bootstrap loader. |
| if (loader != NULL) { |
| ClassLoaderData* data = java_lang_ClassLoader::loader_data_acquire(loader); |
| // ClassLoader may not be used yet for loading. |
| if (data != NULL && data->dictionary() != NULL) { |
| data->dictionary()->all_entries_do(&closure); |
| } |
| } else { |
| ClassLoaderData::the_null_class_loader_data()->dictionary()->all_entries_do(&closure); |
| } |
| // Get basic arrays for all loaders. |
| Universe::basic_type_classes_do(&closure); |
| } |
| |
| return closure.get_result(env, classCountPtr, classesPtr); |
| } |