hotspot/src/share/vm/runtime/unhandledOops.hpp
author goetz
Mon, 02 Dec 2013 10:26:14 +0100
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permissions -rw-r--r--
8029396: PPC64 (part 212): Several memory ordering fixes in C-code. Summary: memory ordering fixes in GC and other runtime code showing on PPC64. Reviewed-by: kvn, coleenp
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/*
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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP
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#define SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP
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#ifdef CHECK_UNHANDLED_OOPS
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// Detect unhanded oops in VM code
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// The design is that when an oop is declared on the stack as a local
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// variable, the oop is actually a C++ struct with constructor and
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// destructor.  The constructor adds the oop address on a list
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// off each thread and the destructor removes the oop.  At a potential
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// safepoint, the stack addresses of the local variable oops are trashed
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// with a recognizeable value.  If the local variable is used again, it
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// will segfault, indicating an unsafe use of that oop.
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// eg:
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//    oop o;    //register &o on list
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//    funct();  // if potential safepoint - causes clear_naked_oops()
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//              // which trashes o above.
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//    o->do_something();  // Crashes because o is unsafe.
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//
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// This code implements the details of the unhandled oop list on the thread.
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//
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class oop;
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class Thread;
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class UnhandledOopEntry : public CHeapObj<mtThread> {
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 friend class UnhandledOops;
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 private:
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  oop* _oop_ptr;
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  bool _ok_for_gc;
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  address _pc;
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 public:
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  oop* oop_ptr() { return _oop_ptr; }
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  UnhandledOopEntry() : _oop_ptr(NULL), _ok_for_gc(false), _pc(NULL) {}
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  UnhandledOopEntry(oop* op, address pc) :
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                        _oop_ptr(op),   _ok_for_gc(false), _pc(pc) {}
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};
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class UnhandledOops : public CHeapObj<mtThread> {
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 friend class Thread;
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  Thread* _thread;
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  int _level;
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  GrowableArray<UnhandledOopEntry> *_oop_list;
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  void allow_unhandled_oop(oop* op);
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  void clear_unhandled_oops();
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  UnhandledOops(Thread* thread);
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  ~UnhandledOops();
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 public:
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  static void dump_oops(UnhandledOops* list);
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  void register_unhandled_oop(oop* op, address pc);
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  void unregister_unhandled_oop(oop* op);
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};
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#ifdef _LP64
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const intptr_t BAD_OOP_ADDR =  0xfffffffffffffff1;
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#else
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const intptr_t BAD_OOP_ADDR =  0xfffffff1;
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#endif // _LP64
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#endif // CHECK_UNHANDLED_OOPS
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#endif // SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP