author | dholmes |
Mon, 21 Mar 2011 22:16:19 -0400 | |
changeset 8735 | 9829dda3b405 |
parent 7397 | 5b173b4ca846 |
child 17376 | 4ee999c3c007 |
permissions | -rw-r--r-- |
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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 { |
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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 { |
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friend class Thread; |
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private: |
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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 |