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 "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "oops/oop.inline.hpp"
28 #include "prims/jvmtiExport.hpp"
29 #include "runtime/jniHandles.hpp"
30 #include "runtime/mutexLocker.hpp"
31 #include "runtime/thread.inline.hpp"
32
33 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
34
35 JNIHandleBlock* JNIHandles::_global_handles = NULL;
36 JNIHandleBlock* JNIHandles::_weak_global_handles = NULL;
37 oop JNIHandles::_deleted_handle = NULL;
38
39
40 jobject JNIHandles::make_local(oop obj) {
41 if (obj == NULL) {
42 return NULL; // ignore null handles
43 } else {
44 Thread* thread = Thread::current();
45 assert(Universe::heap()->is_in_reserved(obj), "sanity check");
46 return thread->active_handles()->allocate_handle(obj);
47 }
48 }
49
50
51 // optimized versions
69 return thread->active_handles()->allocate_handle(obj);
70 }
71 }
72
73
74 jobject JNIHandles::make_global(Handle obj) {
75 assert(!Universe::heap()->is_gc_active(), "can't extend the root set during GC");
76 jobject res = NULL;
77 if (!obj.is_null()) {
78 // ignore null handles
79 MutexLocker ml(JNIGlobalHandle_lock);
80 assert(Universe::heap()->is_in_reserved(obj()), "sanity check");
81 res = _global_handles->allocate_handle(obj());
82 } else {
83 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
84 }
85
86 return res;
87 }
88
89
90 jobject JNIHandles::make_weak_global(Handle obj) {
91 assert(!Universe::heap()->is_gc_active(), "can't extend the root set during GC");
92 jobject res = NULL;
93 if (!obj.is_null()) {
94 // ignore null handles
95 MutexLocker ml(JNIGlobalHandle_lock);
96 assert(Universe::heap()->is_in_reserved(obj()), "sanity check");
97 res = _weak_global_handles->allocate_handle(obj());
98 } else {
99 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
100 }
101 return res;
102 }
103
104
105 void JNIHandles::destroy_global(jobject handle) {
106 if (handle != NULL) {
107 assert(is_global_handle(handle), "Invalid delete of global JNI handle");
108 *((oop*)handle) = deleted_handle(); // Mark the handle as deleted, allocate will reuse it
109 }
110 }
111
112
113 void JNIHandles::destroy_weak_global(jobject handle) {
114 if (handle != NULL) {
115 assert(!CheckJNICalls || is_weak_global_handle(handle), "Invalid delete of weak global JNI handle");
116 *((oop*)handle) = deleted_handle(); // Mark the handle as deleted, allocate will reuse it
117 }
118 }
119
120
121 void JNIHandles::oops_do(OopClosure* f) {
122 f->do_oop(&_deleted_handle);
123 _global_handles->oops_do(f);
124 }
125
126
127 void JNIHandles::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
128 _weak_global_handles->weak_oops_do(is_alive, f);
129 }
130
131
132 void JNIHandles::initialize() {
133 _global_handles = JNIHandleBlock::allocate_block();
134 _weak_global_handles = JNIHandleBlock::allocate_block();
135 EXCEPTION_MARK;
136 // We will never reach the CATCH below since Exceptions::_throw will cause
|
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 "precompiled.hpp"
26 #include "classfile/systemDictionary.hpp"
27 #include "oops/oop.inline.hpp"
28 #include "prims/jvmtiExport.hpp"
29 #include "runtime/jniHandles.hpp"
30 #include "runtime/mutexLocker.hpp"
31 #include "runtime/thread.inline.hpp"
32 #if INCLUDE_ALL_GCS
33 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
34 #endif
35
36 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
37
38 JNIHandleBlock* JNIHandles::_global_handles = NULL;
39 JNIHandleBlock* JNIHandles::_weak_global_handles = NULL;
40 oop JNIHandles::_deleted_handle = NULL;
41
42
43 jobject JNIHandles::make_local(oop obj) {
44 if (obj == NULL) {
45 return NULL; // ignore null handles
46 } else {
47 Thread* thread = Thread::current();
48 assert(Universe::heap()->is_in_reserved(obj), "sanity check");
49 return thread->active_handles()->allocate_handle(obj);
50 }
51 }
52
53
54 // optimized versions
72 return thread->active_handles()->allocate_handle(obj);
73 }
74 }
75
76
77 jobject JNIHandles::make_global(Handle obj) {
78 assert(!Universe::heap()->is_gc_active(), "can't extend the root set during GC");
79 jobject res = NULL;
80 if (!obj.is_null()) {
81 // ignore null handles
82 MutexLocker ml(JNIGlobalHandle_lock);
83 assert(Universe::heap()->is_in_reserved(obj()), "sanity check");
84 res = _global_handles->allocate_handle(obj());
85 } else {
86 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
87 }
88
89 return res;
90 }
91
92 jobject JNIHandles::make_weak_global(Handle obj) {
93 assert(!Universe::heap()->is_gc_active(), "can't extend the root set during GC");
94 jobject res = NULL;
95 if (!obj.is_null()) {
96 // ignore null handles
97 {
98 MutexLocker ml(JNIGlobalHandle_lock);
99 assert(Universe::heap()->is_in_reserved(obj()), "sanity check");
100 res = _weak_global_handles->allocate_handle(obj());
101 }
102 // Add weak tag.
103 assert(is_ptr_aligned(res, weak_tag_alignment), "invariant");
104 char* tptr = reinterpret_cast<char*>(res) + weak_tag_value;
105 res = reinterpret_cast<jobject>(tptr);
106 } else {
107 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
108 }
109 return res;
110 }
111
112 template<bool external_guard>
113 oop JNIHandles::resolve_jweak(jweak handle) {
114 assert(is_jweak(handle), "precondition");
115 oop result = jweak_ref(handle);
116 result = guard_value<external_guard>(result);
117 #if INCLUDE_ALL_GCS
118 if (result != NULL && UseG1GC) {
119 G1SATBCardTableModRefBS::enqueue(result);
120 }
121 #endif // INCLUDE_ALL_GCS
122 return result;
123 }
124
125 template oop JNIHandles::resolve_jweak<true>(jweak);
126 template oop JNIHandles::resolve_jweak<false>(jweak);
127
128 void JNIHandles::destroy_global(jobject handle) {
129 if (handle != NULL) {
130 assert(is_global_handle(handle), "Invalid delete of global JNI handle");
131 jobject_ref(handle) = deleted_handle();
132 }
133 }
134
135 void JNIHandles::destroy_weak_global(jobject handle) {
136 if (handle != NULL) {
137 jweak_ref(handle) = deleted_handle();
138 }
139 }
140
141
142 void JNIHandles::oops_do(OopClosure* f) {
143 f->do_oop(&_deleted_handle);
144 _global_handles->oops_do(f);
145 }
146
147
148 void JNIHandles::weak_oops_do(BoolObjectClosure* is_alive, OopClosure* f) {
149 _weak_global_handles->weak_oops_do(is_alive, f);
150 }
151
152
153 void JNIHandles::initialize() {
154 _global_handles = JNIHandleBlock::allocate_block();
155 _weak_global_handles = JNIHandleBlock::allocate_block();
156 EXCEPTION_MARK;
157 // We will never reach the CATCH below since Exceptions::_throw will cause
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