1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/prims/jvmtiGetLoadedClasses.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,325 @@
1.4 +/*
1.5 + * Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +
1.29 +# include "incls/_precompiled.incl"
1.30 +# include "incls/_jvmtiGetLoadedClasses.cpp.incl"
1.31 +
1.32 +
1.33 +// The closure for GetLoadedClasses and GetClassLoaderClasses
1.34 +class JvmtiGetLoadedClassesClosure : public StackObj {
1.35 + // Since the SystemDictionary::classes_do callback
1.36 + // doesn't pass a closureData pointer,
1.37 + // we use a thread-local slot to hold a pointer to
1.38 + // a stack allocated instance of this structure.
1.39 + private:
1.40 + jobject _initiatingLoader;
1.41 + int _count;
1.42 + Handle* _list;
1.43 + int _index;
1.44 +
1.45 + private:
1.46 + // Getting and setting the thread local pointer
1.47 + static JvmtiGetLoadedClassesClosure* get_this() {
1.48 + JvmtiGetLoadedClassesClosure* result = NULL;
1.49 + JavaThread* thread = JavaThread::current();
1.50 + result = thread->get_jvmti_get_loaded_classes_closure();
1.51 + return result;
1.52 + }
1.53 + static void set_this(JvmtiGetLoadedClassesClosure* that) {
1.54 + JavaThread* thread = JavaThread::current();
1.55 + thread->set_jvmti_get_loaded_classes_closure(that);
1.56 + }
1.57 +
1.58 + public:
1.59 + // Constructor/Destructor
1.60 + JvmtiGetLoadedClassesClosure() {
1.61 + JvmtiGetLoadedClassesClosure* that = get_this();
1.62 + assert(that == NULL, "JvmtiGetLoadedClassesClosure in use");
1.63 + _initiatingLoader = NULL;
1.64 + _count = 0;
1.65 + _list = NULL;
1.66 + _index = 0;
1.67 + set_this(this);
1.68 + }
1.69 +
1.70 + JvmtiGetLoadedClassesClosure(jobject initiatingLoader) {
1.71 + JvmtiGetLoadedClassesClosure* that = get_this();
1.72 + assert(that == NULL, "JvmtiGetLoadedClassesClosure in use");
1.73 + _initiatingLoader = initiatingLoader;
1.74 + _count = 0;
1.75 + _list = NULL;
1.76 + _index = 0;
1.77 + set_this(this);
1.78 + }
1.79 +
1.80 + ~JvmtiGetLoadedClassesClosure() {
1.81 + JvmtiGetLoadedClassesClosure* that = get_this();
1.82 + assert(that != NULL, "JvmtiGetLoadedClassesClosure not found");
1.83 + set_this(NULL);
1.84 + _initiatingLoader = NULL;
1.85 + _count = 0;
1.86 + if (_list != NULL) {
1.87 + FreeHeap(_list);
1.88 + _list = NULL;
1.89 + }
1.90 + _index = 0;
1.91 + }
1.92 +
1.93 + // Accessors.
1.94 + jobject get_initiatingLoader() {
1.95 + return _initiatingLoader;
1.96 + }
1.97 +
1.98 + int get_count() {
1.99 + return _count;
1.100 + }
1.101 +
1.102 + void set_count(int value) {
1.103 + _count = value;
1.104 + }
1.105 +
1.106 + Handle* get_list() {
1.107 + return _list;
1.108 + }
1.109 +
1.110 + void set_list(Handle* value) {
1.111 + _list = value;
1.112 + }
1.113 +
1.114 + int get_index() {
1.115 + return _index;
1.116 + }
1.117 +
1.118 + void set_index(int value) {
1.119 + _index = value;
1.120 + }
1.121 +
1.122 + Handle get_element(int index) {
1.123 + if ((_list != NULL) && (index < _count)) {
1.124 + return _list[index];
1.125 + } else {
1.126 + assert(false, "empty get_element");
1.127 + return Handle();
1.128 + }
1.129 + }
1.130 +
1.131 + void set_element(int index, Handle value) {
1.132 + if ((_list != NULL) && (index < _count)) {
1.133 + _list[index] = value;
1.134 + } else {
1.135 + assert(false, "bad set_element");
1.136 + }
1.137 + }
1.138 +
1.139 + // Other predicates
1.140 + bool available() {
1.141 + return (_list != NULL);
1.142 + }
1.143 +
1.144 +#ifdef ASSERT
1.145 + // For debugging.
1.146 + void check(int limit) {
1.147 + for (int i = 0; i < limit; i += 1) {
1.148 + assert(Universe::heap()->is_in(get_element(i)()), "check fails");
1.149 + }
1.150 + }
1.151 +#endif
1.152 +
1.153 + // Public methods that get called within the scope of the closure
1.154 + void allocate() {
1.155 + _list = NEW_C_HEAP_ARRAY(Handle, _count);
1.156 + assert(_list != NULL, "Out of memory");
1.157 + if (_list == NULL) {
1.158 + _count = 0;
1.159 + }
1.160 + }
1.161 +
1.162 + void extract(JvmtiEnv *env, jclass* result) {
1.163 + for (int index = 0; index < _count; index += 1) {
1.164 + result[index] = (jclass) env->jni_reference(get_element(index));
1.165 + }
1.166 + }
1.167 +
1.168 + // Finally, the static methods that are the callbacks
1.169 + static void increment(klassOop k) {
1.170 + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
1.171 + if (that->get_initiatingLoader() == NULL) {
1.172 + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
1.173 + that->set_count(that->get_count() + 1);
1.174 + }
1.175 + } else if (k != NULL) {
1.176 + // if initiating loader not null, just include the instance with 1 dimension
1.177 + that->set_count(that->get_count() + 1);
1.178 + }
1.179 + }
1.180 +
1.181 + static void increment_with_loader(klassOop k, oop loader) {
1.182 + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
1.183 + if (loader == JNIHandles::resolve(that->get_initiatingLoader())) {
1.184 + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
1.185 + that->set_count(that->get_count() + 1);
1.186 + }
1.187 + }
1.188 + }
1.189 +
1.190 + static void prim_array_increment_with_loader(klassOop array, oop loader) {
1.191 + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
1.192 + if (loader == JNIHandles::resolve(that->get_initiatingLoader())) {
1.193 + that->set_count(that->get_count() + 1);
1.194 + }
1.195 + }
1.196 +
1.197 + static void add(klassOop k) {
1.198 + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
1.199 + if (that->available()) {
1.200 + if (that->get_initiatingLoader() == NULL) {
1.201 + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
1.202 + oop mirror = Klass::cast(l)->java_mirror();
1.203 + that->set_element(that->get_index(), mirror);
1.204 + that->set_index(that->get_index() + 1);
1.205 + }
1.206 + } else if (k != NULL) {
1.207 + // if initiating loader not null, just include the instance with 1 dimension
1.208 + oop mirror = Klass::cast(k)->java_mirror();
1.209 + that->set_element(that->get_index(), mirror);
1.210 + that->set_index(that->get_index() + 1);
1.211 + }
1.212 + }
1.213 + }
1.214 +
1.215 + static void add_with_loader(klassOop k, oop loader) {
1.216 + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
1.217 + if (that->available()) {
1.218 + if (loader == JNIHandles::resolve(that->get_initiatingLoader())) {
1.219 + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
1.220 + oop mirror = Klass::cast(l)->java_mirror();
1.221 + that->set_element(that->get_index(), mirror);
1.222 + that->set_index(that->get_index() + 1);
1.223 + }
1.224 + }
1.225 + }
1.226 + }
1.227 +
1.228 + // increment the count for the given basic type array class (and any
1.229 + // multi-dimensional arrays). For example, for [B we check for
1.230 + // [[B, [[[B, .. and the count is incremented for each one that exists.
1.231 + static void increment_for_basic_type_arrays(klassOop k) {
1.232 + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
1.233 + assert(that != NULL, "no JvmtiGetLoadedClassesClosure");
1.234 + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
1.235 + that->set_count(that->get_count() + 1);
1.236 + }
1.237 + }
1.238 +
1.239 + // add the basic type array class and its multi-dimensional array classes to the list
1.240 + static void add_for_basic_type_arrays(klassOop k) {
1.241 + JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
1.242 + assert(that != NULL, "no JvmtiGetLoadedClassesClosure");
1.243 + assert(that->available(), "no list");
1.244 + for (klassOop l = k; l != NULL; l = Klass::cast(l)->array_klass_or_null()) {
1.245 + oop mirror = Klass::cast(l)->java_mirror();
1.246 + that->set_element(that->get_index(), mirror);
1.247 + that->set_index(that->get_index() + 1);
1.248 + }
1.249 + }
1.250 +};
1.251 +
1.252 +
1.253 +jvmtiError
1.254 +JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) {
1.255 + // Since SystemDictionary::classes_do only takes a function pointer
1.256 + // and doesn't call back with a closure data pointer,
1.257 + // we can only pass static methods.
1.258 +
1.259 + JvmtiGetLoadedClassesClosure closure;
1.260 + {
1.261 + // To get a consistent list of classes we need MultiArray_lock to ensure
1.262 + // array classes aren't created, and SystemDictionary_lock to ensure that
1.263 + // classes aren't added to the system dictionary,
1.264 + MutexLocker ma(MultiArray_lock);
1.265 + MutexLocker sd(SystemDictionary_lock);
1.266 +
1.267 + // First, count the classes
1.268 + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment);
1.269 + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment);
1.270 + // Next, fill in the classes
1.271 + closure.allocate();
1.272 + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add);
1.273 + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add);
1.274 + // Drop the SystemDictionary_lock, so the results could be wrong from here,
1.275 + // but we still have a snapshot.
1.276 + }
1.277 + // Post results
1.278 + jclass* result_list;
1.279 + jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass),
1.280 + (unsigned char**)&result_list);
1.281 + if (err != JVMTI_ERROR_NONE) {
1.282 + return err;
1.283 + }
1.284 + closure.extract(env, result_list);
1.285 + *classCountPtr = closure.get_count();
1.286 + *classesPtr = result_list;
1.287 + return JVMTI_ERROR_NONE;
1.288 +}
1.289 +
1.290 +jvmtiError
1.291 +JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader,
1.292 + jint* classCountPtr, jclass** classesPtr) {
1.293 + // Since SystemDictionary::classes_do only takes a function pointer
1.294 + // and doesn't call back with a closure data pointer,
1.295 + // we can only pass static methods.
1.296 + JvmtiGetLoadedClassesClosure closure(initiatingLoader);
1.297 + {
1.298 + // To get a consistent list of classes we need MultiArray_lock to ensure
1.299 + // array classes aren't created, and SystemDictionary_lock to ensure that
1.300 + // classes aren't added to the system dictionary,
1.301 + MutexLocker ma(MultiArray_lock);
1.302 + MutexLocker sd(SystemDictionary_lock);
1.303 + // First, count the classes in the system dictionary which have this loader recorded
1.304 + // as an initiating loader. For basic type arrays this information is not recorded
1.305 + // so GetClassLoaderClasses will return all of the basic type arrays. This is okay
1.306 + // because the defining loader for basic type arrays is always the boot class loader
1.307 + // and these classes are "visible" to all loaders.
1.308 + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader);
1.309 + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays);
1.310 + // Next, fill in the classes
1.311 + closure.allocate();
1.312 + SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader);
1.313 + Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays);
1.314 + // Drop the SystemDictionary_lock, so the results could be wrong from here,
1.315 + // but we still have a snapshot.
1.316 + }
1.317 + // Post results
1.318 + jclass* result_list;
1.319 + jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass),
1.320 + (unsigned char**)&result_list);
1.321 + if (err != JVMTI_ERROR_NONE) {
1.322 + return err;
1.323 + }
1.324 + closure.extract(env, result_list);
1.325 + *classCountPtr = closure.get_count();
1.326 + *classesPtr = result_list;
1.327 + return JVMTI_ERROR_NONE;
1.328 +}
