1/*
2 * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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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
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24
25#ifndef SHARE_CLASSFILE_METADATAONSTACKMARK_HPP
26#define SHARE_CLASSFILE_METADATAONSTACKMARK_HPP
27
28#include "memory/allocation.hpp"
29#include "utilities/chunkedList.hpp"
30
31class Metadata;
32
33typedef 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 if errors occur, relocated methods, and temporary
40// constant pools.
41class MetadataOnStackMark : public StackObj {
42 NOT_PRODUCT(static bool _is_active;)
43 static MetadataOnStackBuffer* _used_buffers;
44 static MetadataOnStackBuffer* _free_buffers;
45 static MetadataOnStackBuffer* _current_buffer;
46
47 static MetadataOnStackBuffer* allocate_buffer();
48 static void retire_buffer(MetadataOnStackBuffer* buffer);
49
50 public:
51 MetadataOnStackMark(bool walk_all_metadata, bool redefinition_walk);
52 ~MetadataOnStackMark();
53
54 static void record(Metadata* m);
55 static void retire_current_buffer();
56};
57
58#endif // SHARE_CLASSFILE_METADATAONSTACKMARK_HPP
59