| /* |
| * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP |
| #define SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "utilities/chunkedList.hpp" |
| |
| class Metadata; |
| |
| typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; |
| |
| // Helper class to mark and unmark metadata used on the stack as either handles |
| // or executing methods, so that it can't be deleted during class redefinition |
| // and class unloading. |
| // This is also used for other things that can be deallocated, like class |
| // metadata during parsing if errors occur, relocated methods, and temporary |
| // constant pools. |
| class MetadataOnStackMark : public StackObj { |
| NOT_PRODUCT(static bool _is_active;) |
| static MetadataOnStackBuffer* _used_buffers; |
| static MetadataOnStackBuffer* _free_buffers; |
| static MetadataOnStackBuffer* _current_buffer; |
| |
| static MetadataOnStackBuffer* allocate_buffer(); |
| static void retire_buffer(MetadataOnStackBuffer* buffer); |
| |
| public: |
| MetadataOnStackMark(bool redefinition_walk); |
| ~MetadataOnStackMark(); |
| |
| static void record(Metadata* m); |
| static void retire_current_buffer(); |
| }; |
| |
| #endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP |