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. 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_CLASSFILE_METADATAONSTACKMARK_HPP 26 #define SHARE_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 if errors occur, relocated methods, and temporary 40 // constant pools. 41 class 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