comparison src/share/vm/classfile/metadataOnStackMark.hpp @ 7949:5daaddd917a1

8006040: NPG: on_stack processing wastes space in ConstantPool Summary: Added on_stack bit to flags. Also MetadataMarkOnStack is used for more than JVMTI so had to be moved. Reviewed-by: dholmes, stefank
author coleenp
date Wed, 23 Jan 2013 10:34:29 -0500
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children b12a2a9b05ca
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7632:2ef7061f13b4 7949:5daaddd917a1
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 */
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