Thu, 24 Jan 2013 22:13:32 -0800
8005128: JSR 292: the mlvm redefineClassInBootstrap test crashes in ConstantPool::compare_entry_to
Summary: When constant pool is copied in merge_constant_pools the invokedynamic operands must be copied before.
Reviewed-by: coleenp, twisti
Contributed-by: serguei.spitsyn@oracle.com
1 /*
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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23 */
25 #include "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "memory/universe.inline.hpp"
28 #include "prims/jvmtiGetLoadedClasses.hpp"
29 #include "runtime/thread.hpp"
33 // The closure for GetLoadedClasses and GetClassLoaderClasses
34 class JvmtiGetLoadedClassesClosure : public StackObj {
35 // Since the SystemDictionary::classes_do callback
36 // doesn't pass a closureData pointer,
37 // we use a thread-local slot to hold a pointer to
38 // a stack allocated instance of this structure.
39 private:
40 jobject _initiatingLoader;
41 int _count;
42 Handle* _list;
43 int _index;
45 private:
46 // Getting and setting the thread local pointer
47 static JvmtiGetLoadedClassesClosure* get_this() {
48 JvmtiGetLoadedClassesClosure* result = NULL;
49 JavaThread* thread = JavaThread::current();
50 result = thread->get_jvmti_get_loaded_classes_closure();
51 return result;
52 }
53 static void set_this(JvmtiGetLoadedClassesClosure* that) {
54 JavaThread* thread = JavaThread::current();
55 thread->set_jvmti_get_loaded_classes_closure(that);
56 }
58 public:
59 // Constructor/Destructor
60 JvmtiGetLoadedClassesClosure() {
61 JvmtiGetLoadedClassesClosure* that = get_this();
62 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use");
63 _initiatingLoader = NULL;
64 _count = 0;
65 _list = NULL;
66 _index = 0;
67 set_this(this);
68 }
70 JvmtiGetLoadedClassesClosure(jobject initiatingLoader) {
71 JvmtiGetLoadedClassesClosure* that = get_this();
72 assert(that == NULL, "JvmtiGetLoadedClassesClosure in use");
73 _initiatingLoader = initiatingLoader;
74 _count = 0;
75 _list = NULL;
76 _index = 0;
77 set_this(this);
78 }
80 ~JvmtiGetLoadedClassesClosure() {
81 JvmtiGetLoadedClassesClosure* that = get_this();
82 assert(that != NULL, "JvmtiGetLoadedClassesClosure not found");
83 set_this(NULL);
84 _initiatingLoader = NULL;
85 _count = 0;
86 if (_list != NULL) {
87 FreeHeap(_list);
88 _list = NULL;
89 }
90 _index = 0;
91 }
93 // Accessors.
94 jobject get_initiatingLoader() {
95 return _initiatingLoader;
96 }
98 int get_count() {
99 return _count;
100 }
102 void set_count(int value) {
103 _count = value;
104 }
106 Handle* get_list() {
107 return _list;
108 }
110 void set_list(Handle* value) {
111 _list = value;
112 }
114 int get_index() {
115 return _index;
116 }
118 void set_index(int value) {
119 _index = value;
120 }
122 Handle get_element(int index) {
123 if ((_list != NULL) && (index < _count)) {
124 return _list[index];
125 } else {
126 assert(false, "empty get_element");
127 return Handle();
128 }
129 }
131 void set_element(int index, Handle value) {
132 if ((_list != NULL) && (index < _count)) {
133 _list[index] = value;
134 } else {
135 assert(false, "bad set_element");
136 }
137 }
139 // Other predicates
140 bool available() {
141 return (_list != NULL);
142 }
144 #ifdef ASSERT
145 // For debugging.
146 void check(int limit) {
147 for (int i = 0; i < limit; i += 1) {
148 assert(Universe::heap()->is_in(get_element(i)()), "check fails");
149 }
150 }
151 #endif
153 // Public methods that get called within the scope of the closure
154 void allocate() {
155 _list = NEW_C_HEAP_ARRAY(Handle, _count, mtInternal);
156 assert(_list != NULL, "Out of memory");
157 if (_list == NULL) {
158 _count = 0;
159 }
160 }
162 void extract(JvmtiEnv *env, jclass* result) {
163 for (int index = 0; index < _count; index += 1) {
164 result[index] = (jclass) env->jni_reference(get_element(index));
165 }
166 }
168 // Finally, the static methods that are the callbacks
169 static void increment(Klass* k) {
170 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
171 if (that->get_initiatingLoader() == NULL) {
172 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
173 that->set_count(that->get_count() + 1);
174 }
175 } else if (k != NULL) {
176 // if initiating loader not null, just include the instance with 1 dimension
177 that->set_count(that->get_count() + 1);
178 }
179 }
181 static void increment_with_loader(Klass* k, ClassLoaderData* loader_data) {
182 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
183 oop class_loader = loader_data->class_loader();
184 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) {
185 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
186 that->set_count(that->get_count() + 1);
187 }
188 }
189 }
191 static void prim_array_increment_with_loader(Klass* array, ClassLoaderData* loader_data) {
192 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
193 oop class_loader = loader_data->class_loader();
194 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) {
195 that->set_count(that->get_count() + 1);
196 }
197 }
199 static void add(Klass* k) {
200 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
201 if (that->available()) {
202 if (that->get_initiatingLoader() == NULL) {
203 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
204 oop mirror = l->java_mirror();
205 that->set_element(that->get_index(), mirror);
206 that->set_index(that->get_index() + 1);
207 }
208 } else if (k != NULL) {
209 // if initiating loader not null, just include the instance with 1 dimension
210 oop mirror = k->java_mirror();
211 that->set_element(that->get_index(), mirror);
212 that->set_index(that->get_index() + 1);
213 }
214 }
215 }
217 static void add_with_loader(Klass* k, ClassLoaderData* loader_data) {
218 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
219 if (that->available()) {
220 oop class_loader = loader_data->class_loader();
221 if (class_loader == JNIHandles::resolve(that->get_initiatingLoader())) {
222 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
223 oop mirror = l->java_mirror();
224 that->set_element(that->get_index(), mirror);
225 that->set_index(that->get_index() + 1);
226 }
227 }
228 }
229 }
231 // increment the count for the given basic type array class (and any
232 // multi-dimensional arrays). For example, for [B we check for
233 // [[B, [[[B, .. and the count is incremented for each one that exists.
234 static void increment_for_basic_type_arrays(Klass* k) {
235 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
236 assert(that != NULL, "no JvmtiGetLoadedClassesClosure");
237 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
238 that->set_count(that->get_count() + 1);
239 }
240 }
242 // add the basic type array class and its multi-dimensional array classes to the list
243 static void add_for_basic_type_arrays(Klass* k) {
244 JvmtiGetLoadedClassesClosure* that = JvmtiGetLoadedClassesClosure::get_this();
245 assert(that != NULL, "no JvmtiGetLoadedClassesClosure");
246 assert(that->available(), "no list");
247 for (Klass* l = k; l != NULL; l = l->array_klass_or_null()) {
248 oop mirror = l->java_mirror();
249 that->set_element(that->get_index(), mirror);
250 that->set_index(that->get_index() + 1);
251 }
252 }
253 };
256 jvmtiError
257 JvmtiGetLoadedClasses::getLoadedClasses(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) {
258 // Since SystemDictionary::classes_do only takes a function pointer
259 // and doesn't call back with a closure data pointer,
260 // we can only pass static methods.
262 JvmtiGetLoadedClassesClosure closure;
263 {
264 // To get a consistent list of classes we need MultiArray_lock to ensure
265 // array classes aren't created, and SystemDictionary_lock to ensure that
266 // classes aren't added to the system dictionary,
267 MutexLocker ma(MultiArray_lock);
268 MutexLocker sd(SystemDictionary_lock);
270 // First, count the classes
271 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment);
272 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment);
273 // Next, fill in the classes
274 closure.allocate();
275 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add);
276 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add);
277 // Drop the SystemDictionary_lock, so the results could be wrong from here,
278 // but we still have a snapshot.
279 }
280 // Post results
281 jclass* result_list;
282 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass),
283 (unsigned char**)&result_list);
284 if (err != JVMTI_ERROR_NONE) {
285 return err;
286 }
287 closure.extract(env, result_list);
288 *classCountPtr = closure.get_count();
289 *classesPtr = result_list;
290 return JVMTI_ERROR_NONE;
291 }
293 jvmtiError
294 JvmtiGetLoadedClasses::getClassLoaderClasses(JvmtiEnv *env, jobject initiatingLoader,
295 jint* classCountPtr, jclass** classesPtr) {
296 // Since SystemDictionary::classes_do only takes a function pointer
297 // and doesn't call back with a closure data pointer,
298 // we can only pass static methods.
299 JvmtiGetLoadedClassesClosure closure(initiatingLoader);
300 {
301 // To get a consistent list of classes we need MultiArray_lock to ensure
302 // array classes aren't created, and SystemDictionary_lock to ensure that
303 // classes aren't added to the system dictionary,
304 MutexLocker ma(MultiArray_lock);
305 MutexLocker sd(SystemDictionary_lock);
306 // First, count the classes in the system dictionary which have this loader recorded
307 // as an initiating loader. For basic type arrays this information is not recorded
308 // so GetClassLoaderClasses will return all of the basic type arrays. This is okay
309 // because the defining loader for basic type arrays is always the boot class loader
310 // and these classes are "visible" to all loaders.
311 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::increment_with_loader);
312 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::increment_for_basic_type_arrays);
313 // Next, fill in the classes
314 closure.allocate();
315 SystemDictionary::classes_do(&JvmtiGetLoadedClassesClosure::add_with_loader);
316 Universe::basic_type_classes_do(&JvmtiGetLoadedClassesClosure::add_for_basic_type_arrays);
317 // Drop the SystemDictionary_lock, so the results could be wrong from here,
318 // but we still have a snapshot.
319 }
320 // Post results
321 jclass* result_list;
322 jvmtiError err = env->Allocate(closure.get_count() * sizeof(jclass),
323 (unsigned char**)&result_list);
324 if (err != JVMTI_ERROR_NONE) {
325 return err;
326 }
327 closure.extract(env, result_list);
328 *classCountPtr = closure.get_count();
329 *classesPtr = result_list;
330 return JVMTI_ERROR_NONE;
331 }