Mercurial > hg > truffle
annotate src/share/vm/runtime/unhandledOops.hpp @ 4058:59e515ee9354
7059047: EA: can't find initializing store with several CheckCastPP
Summary: Split adjust_escape_state() method into two methods to find initializing stores.
Reviewed-by: never
author | kvn |
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date | Mon, 07 Nov 2011 14:33:57 -0800 |
parents | f95d63e2154a |
children | f9be75d21404 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
1972 | 24 |
25 #ifndef SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP | |
26 #define SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP | |
27 | |
0 | 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 { | |
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 { | |
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 | |
1972 | 88 |
89 #endif // SHARE_VM_RUNTIME_UNHANDLEDOOPS_HPP |