Thu, 31 Mar 2016 14:23:12 -0700
Merge
1 /*
2 * Copyright (c) 2013, 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.
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 */
25 #ifndef SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
26 #define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP
28 #include "memory/allocation.hpp"
29 #include "utilities/chunkedList.hpp"
31 class Metadata;
33 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer;
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;)
43 static volatile MetadataOnStackBuffer* _used_buffers;
44 static volatile MetadataOnStackBuffer* _free_buffers;
46 static MetadataOnStackBuffer* allocate_buffer();
47 static void retire_buffer(MetadataOnStackBuffer* buffer);
49 public:
50 MetadataOnStackMark(bool visit_code_cache);
51 ~MetadataOnStackMark();
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 };
58 #endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP