2362N/A * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. 2362N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 0N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 0N/A// Detect unhanded oops in VM code 0N/A// The design is that when an oop is declared on the stack as a local 0N/A// variable, the oop is actually a C++ struct with constructor and 0N/A// destructor. The constructor adds the oop address on a list 0N/A// off each thread and the destructor removes the oop. At a potential 0N/A// safepoint, the stack addresses of the local variable oops are trashed 0N/A// with a recognizeable value. If the local variable is used again, it 0N/A// will segfault, indicating an unsafe use of that oop. 0N/A// oop o; //register &o on list 0N/A// funct(); // if potential safepoint - causes clear_naked_oops() 0N/A// // which trashes o above. 0N/A// o->do_something(); // Crashes because o is unsafe. 0N/A// This code implements the details of the unhandled oop list on the thread. 0N/A#
endif // CHECK_UNHANDLED_OOPS 0N/A#
endif // SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP