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comparison: src/share/vm/runtime/unhandledOops.hpp
src/share/vm/runtime/unhandledOops.hpp
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| 1 /* | |
| 2 * Copyright (c) 2005, 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_RUNTIME_UNHANDLEDOOPS_HPP | |
| 26 #define SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP | |
| 27 | |
| 28 #ifdef CHECK_UNHANDLED_OOPS | |
| 29 | |
| 30 // Detect unhanded oops in VM code | |
| 31 | |
| 32 // The design is that when an oop is declared on the stack as a local | |
| 33 // variable, the oop is actually a C++ struct with constructor and | |
| 34 // destructor. The constructor adds the oop address on a list | |
| 35 // off each thread and the destructor removes the oop. At a potential | |
| 36 // safepoint, the stack addresses of the local variable oops are trashed | |
| 37 // with a recognizeable value. If the local variable is used again, it | |
| 38 // will segfault, indicating an unsafe use of that oop. | |
| 39 // eg: | |
| 40 // oop o; //register &o on list | |
| 41 // funct(); // if potential safepoint - causes clear_naked_oops() | |
| 42 // // which trashes o above. | |
| 43 // o->do_something(); // Crashes because o is unsafe. | |
| 44 // | |
| 45 // This code implements the details of the unhandled oop list on the thread. | |
| 46 // | |
| 47 | |
| 48 class oop; | |
| 49 class Thread; | |
| 50 | |
| 51 class UnhandledOopEntry : public CHeapObj<mtThread> { | |
| 52 friend class UnhandledOops; | |
| 53 private: | |
| 54 oop* _oop_ptr; | |
| 55 bool _ok_for_gc; | |
| 56 address _pc; | |
| 57 public: | |
| 58 oop* oop_ptr() { return _oop_ptr; } | |
| 59 UnhandledOopEntry() : _oop_ptr(NULL), _ok_for_gc(false), _pc(NULL) {} | |
| 60 UnhandledOopEntry(oop* op, address pc) : | |
| 61 _oop_ptr(op), _ok_for_gc(false), _pc(pc) {} | |
| 62 }; | |
| 63 | |
| 64 | |
| 65 class UnhandledOops : public CHeapObj<mtThread> { | |
| 66 friend class Thread; | |
| 67 private: | |
| 68 Thread* _thread; | |
| 69 int _level; | |
| 70 GrowableArray<UnhandledOopEntry> *_oop_list; | |
| 71 void allow_unhandled_oop(oop* op); | |
| 72 void clear_unhandled_oops(); | |
| 73 UnhandledOops(Thread* thread); | |
| 74 ~UnhandledOops(); | |
| 75 | |
| 76 public: | |
| 77 static void dump_oops(UnhandledOops* list); | |
| 78 void register_unhandled_oop(oop* op, address pc); | |
| 79 void unregister_unhandled_oop(oop* op); | |
| 80 }; | |
| 81 | |
| 82 #ifdef _LP64 | |
| 83 const intptr_t BAD_OOP_ADDR = 0xfffffffffffffff1; | |
| 84 #else | |
| 85 const intptr_t BAD_OOP_ADDR = 0xfffffff1; | |
| 86 #endif // _LP64 | |
| 87 #endif // CHECK_UNHANDLED_OOPS | |
| 88 | |
| 89 #endif // SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |
