--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/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;
+}