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src/share/vm/runtime/unhandledOops.hpp@710a3c8b516e (annotated)
src/share/vm/runtime/unhandledOops.hpp
Tue, 08 Aug 2017 15:57:29 +0800
- author
- aoqi
- date
- Tue, 08 Aug 2017 15:57:29 +0800
- changeset 6876
- 710a3c8b516e
- parent 6198
- 55fb97c4c58d
- parent 0
- f90c822e73f8
- permissions
- -rw-r--r--
merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |
| aoqi@0 | 26 | #define SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #ifdef CHECK_UNHANDLED_OOPS |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | // Detect unhanded oops in VM code |
| aoqi@0 | 31 | |
| aoqi@0 | 32 | // The design is that when an oop is declared on the stack as a local |
| aoqi@0 | 33 | // variable, the oop is actually a C++ struct with constructor and |
| aoqi@0 | 34 | // destructor. The constructor adds the oop address on a list |
| aoqi@0 | 35 | // off each thread and the destructor removes the oop. At a potential |
| aoqi@0 | 36 | // safepoint, the stack addresses of the local variable oops are trashed |
| aoqi@0 | 37 | // with a recognizeable value. If the local variable is used again, it |
| aoqi@0 | 38 | // will segfault, indicating an unsafe use of that oop. |
| aoqi@0 | 39 | // eg: |
| aoqi@0 | 40 | // oop o; //register &o on list |
| aoqi@0 | 41 | // funct(); // if potential safepoint - causes clear_naked_oops() |
| aoqi@0 | 42 | // // which trashes o above. |
| aoqi@0 | 43 | // o->do_something(); // Crashes because o is unsafe. |
| aoqi@0 | 44 | // |
| aoqi@0 | 45 | // This code implements the details of the unhandled oop list on the thread. |
| aoqi@0 | 46 | // |
| aoqi@0 | 47 | |
| aoqi@0 | 48 | class oop; |
| aoqi@0 | 49 | class Thread; |
| aoqi@0 | 50 | |
| aoqi@0 | 51 | class UnhandledOopEntry : public CHeapObj<mtThread> { |
| aoqi@0 | 52 | friend class UnhandledOops; |
| aoqi@0 | 53 | private: |
| aoqi@0 | 54 | oop* _oop_ptr; |
| aoqi@0 | 55 | bool _ok_for_gc; |
| aoqi@0 | 56 | address _pc; |
| aoqi@0 | 57 | public: |
| aoqi@0 | 58 | oop* oop_ptr() { return _oop_ptr; } |
| aoqi@0 | 59 | UnhandledOopEntry() : _oop_ptr(NULL), _ok_for_gc(false), _pc(NULL) {} |
| aoqi@0 | 60 | UnhandledOopEntry(oop* op, address pc) : |
| aoqi@0 | 61 | _oop_ptr(op), _ok_for_gc(false), _pc(pc) {} |
| aoqi@0 | 62 | }; |
| aoqi@0 | 63 | |
| aoqi@0 | 64 | |
| aoqi@0 | 65 | class UnhandledOops : public CHeapObj<mtThread> { |
| aoqi@0 | 66 | friend class Thread; |
| aoqi@0 | 67 | private: |
| aoqi@0 | 68 | Thread* _thread; |
| aoqi@0 | 69 | int _level; |
| aoqi@0 | 70 | GrowableArray<UnhandledOopEntry> *_oop_list; |
| aoqi@0 | 71 | void allow_unhandled_oop(oop* op); |
| aoqi@0 | 72 | void clear_unhandled_oops(); |
| aoqi@0 | 73 | UnhandledOops(Thread* thread); |
| aoqi@0 | 74 | ~UnhandledOops(); |
| aoqi@0 | 75 | |
| aoqi@0 | 76 | public: |
| aoqi@0 | 77 | static void dump_oops(UnhandledOops* list); |
| aoqi@0 | 78 | void register_unhandled_oop(oop* op, address pc); |
| aoqi@0 | 79 | void unregister_unhandled_oop(oop* op); |
| aoqi@0 | 80 | }; |
| aoqi@0 | 81 | |
| aoqi@0 | 82 | #ifdef _LP64 |
| aoqi@0 | 83 | const intptr_t BAD_OOP_ADDR = 0xfffffffffffffff1; |
| aoqi@0 | 84 | #else |
| aoqi@0 | 85 | const intptr_t BAD_OOP_ADDR = 0xfffffff1; |
| aoqi@0 | 86 | #endif // _LP64 |
| aoqi@0 | 87 | #endif // CHECK_UNHANDLED_OOPS |
| aoqi@0 | 88 | |
| aoqi@0 | 89 | #endif // SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |
