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.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "classfile/classLoaderDataGraph.hpp"
26 #include "classfile/dictionary.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "gc/shared/collectedHeap.hpp"
29 #include "memory/universe.hpp"
30 #include "oops/klass.inline.hpp"
31 #include "prims/jvmtiGetLoadedClasses.hpp"
32 #include "runtime/handles.inline.hpp"
33 #include "runtime/javaThread.hpp"
34 #include "runtime/jniHandles.inline.hpp"
35 #include "utilities/stack.inline.hpp"
36
37 // The closure for GetLoadedClasses
38 class LoadedClassesClosure : public KlassClosure {
39 private:
40 Stack<jclass, mtInternal> _classStack;
41 JvmtiEnv* _env;
42 Thread* _cur_thread;
43 bool _dictionary_walk;
44
45 int extract(jclass* result_list) {
46 // The size of the Stack will be 0 after extract, so get it here
47 int count = (int)_classStack.size();
48 int i = count;
49
50 // Pop all jclasses, fill backwards
51 while (!_classStack.is_empty()) {
52 result_list[--i] = _classStack.pop();
53 }
54
55 // Return the number of elements written
56 return count;
57 }
58
59 // Return current size of the Stack
60 int get_count() {
61 return (int)_classStack.size();
62 }
63
64 public:
65 LoadedClassesClosure(JvmtiEnv* env, bool dictionary_walk) :
66 _env(env),
67 _cur_thread(Thread::current()),
68 _dictionary_walk(dictionary_walk) {
69 }
70
71 void do_klass(Klass* k) {
72 // Collect all jclasses
73 _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, k->java_mirror())));
74 if (_dictionary_walk) {
75 // Collect array classes this way when walking the dictionary (because array classes are
76 // not in the dictionary).
77 for (Klass* l = k->array_klass_or_null(); l != nullptr; l = l->array_klass_or_null()) {
78 _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, l->java_mirror())));
79 }
80 }
81 }
82
83 jvmtiError get_result(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) {
84 // Return results by extracting the collected contents into a list
85 // allocated via JvmtiEnv
86 jclass* result_list;
87 jvmtiError error = env->Allocate(get_count() * sizeof(jclass),
88 (unsigned char**)&result_list);
89
90 if (error == JVMTI_ERROR_NONE) {
91 int count = extract(result_list);
92 *classCountPtr = count;
93 *classesPtr = result_list;
94 }
95 return error;
96 }
97 };
98
|
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.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "classfile/classLoaderDataGraph.hpp"
26 #include "classfile/dictionary.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "gc/shared/collectedHeap.hpp"
29 #include "memory/universe.hpp"
30 #include "oops/inlineKlass.hpp"
31 #include "oops/klass.inline.hpp"
32 #include "prims/jvmtiGetLoadedClasses.hpp"
33 #include "runtime/handles.inline.hpp"
34 #include "runtime/javaThread.hpp"
35 #include "runtime/jniHandles.inline.hpp"
36 #include "utilities/stack.inline.hpp"
37
38 // The closure for GetLoadedClasses
39 class LoadedClassesClosure : public KlassClosure {
40 private:
41 Stack<jclass, mtInternal> _classStack;
42 JvmtiEnv* _env;
43 Thread* _cur_thread;
44 bool _dictionary_walk;
45
46 int extract(jclass* result_list) {
47 // The size of the Stack will be 0 after extract, so get it here
48 int count = (int)_classStack.size();
49 int i = count;
50
51 // Pop all jclasses, fill backwards
52 while (!_classStack.is_empty()) {
53 result_list[--i] = _classStack.pop();
54 }
55
56 // Return the number of elements written
57 return count;
58 }
59
60 // Return current size of the Stack
61 int get_count() const {
62 return (int)_classStack.size();
63 }
64
65 // Some klasses should not be reported by GetLoadedClasses/GetClassLoaderClasses
66 bool exclude_klass(Klass* k) const {
67 // Direct instances of ObjArrayKlass represent the Java types that Java code can see.
68 // RefArrayKlass/FlatArrayKlass describe different implementations of the arrays, filter them out.
69 if (k->is_objArray_klass() && k->kind() != Klass::KlassKind::ObjArrayKlassKind) {
70 return true;
71 }
72 return false;
73 }
74
75 public:
76 LoadedClassesClosure(JvmtiEnv* env, bool dictionary_walk) :
77 _env(env),
78 _cur_thread(Thread::current()),
79 _dictionary_walk(dictionary_walk) {
80 }
81
82 void do_klass(Klass* k) {
83 // Collect all jclasses
84 if (!exclude_klass(k)) {
85 _classStack.push((jclass)_env->jni_reference(Handle(_cur_thread, k->java_mirror())));
86 }
87 if (_dictionary_walk) {
88 // Collect array classes this way when walking the dictionary (because array classes are
89 // not in the dictionary).
90 for (Klass* l = k->array_klass_or_null(); l != nullptr; l = l->array_klass_or_null()) {
91 if (!exclude_klass(l)) {
92 _classStack.push((jclass)_env->jni_reference(Handle(_cur_thread, l->java_mirror())));
93 }
94 }
95 }
96 }
97
98 jvmtiError get_result(JvmtiEnv *env, jint* classCountPtr, jclass** classesPtr) {
99 // Return results by extracting the collected contents into a list
100 // allocated via JvmtiEnv
101 jclass* result_list;
102 jvmtiError error = env->Allocate(get_count() * sizeof(jclass),
103 (unsigned char**)&result_list);
104
105 if (error == JVMTI_ERROR_NONE) {
106 int count = extract(result_list);
107 *classCountPtr = count;
108 *classesPtr = result_list;
109 }
110 return error;
111 }
112 };
113
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