Mercurial > hg > graal-compiler
diff src/share/vm/prims/jvmtiGetLoadedClasses.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/prims/jvmtiGetLoadedClasses.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,325 @@ +/* + * Copyright 2003-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + + +# include "incls/_precompiled.incl" +# include "incls/_jvmtiGetLoadedClasses.cpp.incl" + + +// The closure for GetLoadedClasses and GetClassLoaderClasses +class JvmtiGetLoadedClassesClosure : public StackObj { + // Since the SystemDictionary::classes_do callback + // doesn't pass a closureData pointer, + // we use a thread-local slot to hold a pointer to + // a stack allocated instance of this structure. + private: + jobject _initiatingLoader; + int _count; + Handle* _list; + int _index; + + private: + // Getting and setting the thread local pointer + static JvmtiGetLoadedClassesClosure* get_this() { + JvmtiGetLoadedClassesClosure* result = NULL; + JavaThread* thread = JavaThread::current(); + result = thread->get_jvmti_get_loaded_classes_closure(); + return result; + } + static void set_this(JvmtiGetLoadedClassesClosure* that) { + JavaThread* thread = JavaThread::current(); + thread->set_jvmti_get_loaded_classes_closure(that); + } + + public: + // Constructor/Destructor + JvmtiGetLoadedClassesClosure() { + JvmtiGetLoadedClassesClosure* that = get_this(); + assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); + _initiatingLoader = NULL; + _count = 0; + _list = NULL; + _index = 0; + set_this(this); + } + + JvmtiGetLoadedClassesClosure(jobject initiatingLoader) { + JvmtiGetLoadedClassesClosure* that = get_this(); + assert(that == NULL, "JvmtiGetLoadedClassesClosure in use"); + _initiatingLoader = initiatingLoader; + _count = 0; + _list = NULL; + _index = 0; + set_this(this); + } + + ~JvmtiGetLoadedClassesClosure() { + JvmtiGetLoadedClassesClosure* that = get_this(); + assert(that != NULL, "JvmtiGetLoadedClassesClosure not found"); + set_this(NULL); + _initiatingLoader = NULL; + _count = 0; + if (_list != NULL) { + FreeHeap(_list); + _list = NULL; + } + _index = 0; + } + + // Accessors. + jobject get_initiatingLoader() { + return _initiatingLoader; + } + + int get_count() { + return _count; + } + + void set_count(int value) { + _count = value; + } + + Handle* get_list() { + return _list; + } + + void set_list(Handle* value) { + _list = value; + } + + int get_index() { + return _index; + } + + void set_index(int value) { + _index = value; + } + + Handle get_element(int index) { + if ((_list != NULL) && (index < _count)) { + return _list[index]; + } else { + assert(false, "empty get_element"); + return Handle(); + } + } + + void set_element(int index, Handle value) { + if ((_list != NULL) && (index < _count)) { + _list[index] = value; + } else { + assert(false, "bad set_element"); + } + } + + // Other predicates + bool available() { + return (_list != NULL); + } + +#ifdef ASSERT + // For debugging. + void check(int limit) { + for (int i = 0; i < limit; i += 1) { + assert(Universe::heap()->is_in(get_element(i)()), "check fails"); + } + } +#endif + + // Public methods that get called within the scope of the closure + void allocate() { + _list = NEW_C_HEAP_ARRAY(Handle, _count); + assert(_list != NULL, "Out of memory"); + if (_list == NULL) { + _count = 0; + } + } + + void extract(JvmtiEnv *env, jclass* result) { + for (int index = 0; index < _count; index += 1) { + result[index] = (jclass) env->jni_reference(get_element(index)); + } + } + + // Finally, the static methods that are the callbacks + static void increment(klassOop k) { + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); + if (that->get_initiatingLoader() == NULL) { + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { + that->set_count(that->get_count() + 1); + } + } else if (k != NULL) { + // if initiating loader not null, just include the instance with 1 dimension + that->set_count(that->get_count() + 1); + } + } + + static void increment_with_loader(klassOop k, oop loader) { + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); + if (loader == JNIHandles::resolve(that->get_initiatingLoader())) { + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { + that->set_count(that->get_count() + 1); + } + } + } + + static void prim_array_increment_with_loader(klassOop array, oop loader) { + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); + if (loader == JNIHandles::resolve(that->get_initiatingLoader())) { + that->set_count(that->get_count() + 1); + } + } + + static void add(klassOop k) { + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); + if (that->available()) { + if (that->get_initiatingLoader() == NULL) { + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { + oop mirror = Klass::cast(l)->java_mirror(); + that->set_element(that->get_index(), mirror); + that->set_index(that->get_index() + 1); + } + } else if (k != NULL) { + // if initiating loader not null, just include the instance with 1 dimension + oop mirror = Klass::cast(k)->java_mirror(); + that->set_element(that->get_index(), mirror); + that->set_index(that->get_index() + 1); + } + } + } + + static void add_with_loader(klassOop k, oop loader) { + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); + if (that->available()) { + if (loader == JNIHandles::resolve(that->get_initiatingLoader())) { + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { + oop mirror = Klass::cast(l)->java_mirror(); + that->set_element(that->get_index(), mirror); + that->set_index(that->get_index() + 1); + } + } + } + } + + // increment the count for the given basic type array class (and any + // multi-dimensional arrays). For example, for [B we check for + // [[B, [[[B, .. and the count is incremented for each one that exists. + static void increment_for_basic_type_arrays(klassOop k) { + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); + assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { + that->set_count(that->get_count() + 1); + } + } + + // add the basic type array class and its multi-dimensional array classes to the list + static void add_for_basic_type_arrays(klassOop k) { + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this(); + assert(that != NULL, "no JvmtiGetLoadedClassesClosure"); + assert(that->available(), "no list"); + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) { + oop mirror = Klass::cast(l)->java_mirror(); + that->set_element(that->get_index(), mirror); + that->set_index(that->get_index() + 1); + } + } +}; + + +jvmtiError +JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) { + // Since SystemDictionary::classes_do only takes a function pointer + // and doesn't call back with a closure data pointer, + // we can only pass static methods. + + JvmtiGetLoadedClassesClosure closure; + { + // To get a consistent list of classes we need MultiArray_lock to ensure + // array classes aren't created, and SystemDictionary_lock to ensure that + // classes aren't added to the system dictionary, + MutexLocker ma(MultiArray_lock); + MutexLocker sd(SystemDictionary_lock); + + // First, count the classes + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment); + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment); + // Next, fill in the classes + closure.allocate(); + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add); + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add); + // Drop the SystemDictionary_lock, so the results could be wrong from here, + // but we still have a snapshot. + } + // Post results + jclass* result_list; + jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), + (unsigned char**)&result_list); + if (err != JVMTI_ERROR_NONE) { + return err; + } + closure.extract(env, result_list); + *classCountPtr = closure.get_count(); + *classesPtr = result_list; + return JVMTI_ERROR_NONE; +} + +jvmtiError +JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader, + jint* classCountPtr, jclass** classesPtr) { + // Since SystemDictionary::classes_do only takes a function pointer + // and doesn't call back with a closure data pointer, + // we can only pass static methods. + JvmtiGetLoadedClassesClosure closure(initiatingLoader); + { + // To get a consistent list of classes we need MultiArray_lock to ensure + // array classes aren't created, and SystemDictionary_lock to ensure that + // classes aren't added to the system dictionary, + MutexLocker ma(MultiArray_lock); + MutexLocker sd(SystemDictionary_lock); + // First, count the classes in the system dictionary which have this loader recorded + // as an initiating loader. For basic type arrays this information is not recorded + // so GetClassLoaderClasses will return all of the basic type arrays. This is okay + // because the defining loader for basic type arrays is always the boot class loader + // and these classes are "visible" to all loaders. + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader); + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays); + // Next, fill in the classes + closure.allocate(); + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader); + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays); + // Drop the SystemDictionary_lock, so the results could be wrong from here, + // but we still have a snapshot. + } + // Post results + jclass* result_list; + jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass), + (unsigned char**)&result_list); + if (err != JVMTI_ERROR_NONE) { + return err; + } + closure.extract(env, result_list); + *classCountPtr = closure.get_count(); + *classesPtr = result_list; + return JVMTI_ERROR_NONE; +}