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(bool has_redefined_a_class); 41 ~MetadataOnStackMark(); 42 static void record(Metadata* m); 43 }; 44 45 #endif // SHARE_VM_CLASSFILE_METADATAONSTACKMARK_HPP