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.
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 #ifndef SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
26 #define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
27
28 #include "memory/allocation.hpp"
29
30 class Metadata;
31
32 // Helper class to mark and unmark metadata used on the stack as either handles
33 // or executing methods, so that it can't be deleted during class redefinition
34 // and class unloading.
35 // This is also used for other things that can be deallocated, like class
36 // metadata during parsing, relocated methods, and methods in backtraces.
37 class MetadataOnStackMark : public StackObj {
38 NOT_PRODUCT(static bool _is_active;)
39 public:
40 MetadataOnStackMark();
41 ~MetadataOnStackMark();
42 static void record(Metadata* m);
43 };
44
45 #endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
|
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.
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 #ifndef SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
26 #define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/chunkedList.hpp"
30
31 class Metadata;
32
33 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
34
35 // Helper class to mark and unmark metadata used on the stack as either handles
36 // or executing methods, so that it can't be deleted during class redefinition
37 // and class unloading.
38 // This is also used for other things that can be deallocated, like class
39 // metadata during parsing, relocated methods, and methods in backtraces.
40 class MetadataOnStackMark : public StackObj {
41 NOT_PRODUCT(static bool _is_active;)
42
43 static volatile MetadataOnStackBuffer* _used_buffers;
44 static volatile MetadataOnStackBuffer* _free_buffers;
45
46 static MetadataOnStackBuffer* allocate_buffer();
47 static void retire_buffer(MetadataOnStackBuffer* buffer);
48
49 public:
50 MetadataOnStackMark(bool visit_code_cache);
51 ~MetadataOnStackMark();
52
53 static void record(Metadata* m, Thread* thread);
54 static void retire_buffer_for_thread(Thread* thread);
55 static bool has_buffer_for_thread(Thread* thread);
56 };
57
58 #endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
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