Mercurial > hg > truffle
annotate src/share/vm/runtime/monitorChunk.hpp @ 3293:1f4413413144
7039089: G1: changeset for 7037276 broke heap verification, and related cleanups
Summary: In G1 heap verification, we no longer scan perm to G1-collected heap refs as part of process_strong_roots() but rather in a separate explicit oop iteration over the perm gen. This preserves the original perm card-marks. Added a new assertion in younger_refs_iterate() to catch a simple subcase where the user may have forgotten a prior save_marks() call, as happened in the case of G1's attempt to iterate perm to G1 refs when verifying the heap before exit. The assert was deliberately weakened for ParNew+CMS and will be fixed for that combination in a future CR. Also made some (non-G1) cleanups related to code and comments obsoleted by the migration of Symbols to the native heap.
Reviewed-by: iveresov, jmasa, tonyp
author | ysr |
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date | Tue, 26 Apr 2011 21:17:24 -0700 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 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 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_MONITORCHUNK_HPP |
26 #define SHARE_VM_RUNTIME_MONITORCHUNK_HPP | |
27 | |
28 #include "runtime/synchronizer.hpp" | |
29 | |
0 | 30 // Data structure for holding monitors for one activation during |
31 // deoptimization. | |
32 | |
33 class MonitorChunk: public CHeapObj { | |
34 private: | |
35 int _number_of_monitors; | |
36 BasicObjectLock* _monitors; | |
37 BasicObjectLock* monitors() const { return _monitors; } | |
38 MonitorChunk* _next; | |
39 public: | |
40 // Constructor | |
41 MonitorChunk(int number_on_monitors); | |
42 ~MonitorChunk(); | |
43 | |
44 // link operations | |
45 MonitorChunk* next() const { return _next; } | |
46 void set_next(MonitorChunk* next) { _next = next; } | |
47 | |
48 // Tells whether the monitor chunk is linked into the JavaThread | |
49 bool is_linked() const { return next() != NULL; } | |
50 | |
51 // Returns the number of monitors | |
52 int number_of_monitors() const { return _number_of_monitors; } | |
53 | |
54 // Returns the index'th monitor | |
55 BasicObjectLock* at(int index) { assert(index >= 0 && index < number_of_monitors(), "out of bounds check"); return &monitors()[index]; } | |
56 | |
57 | |
58 // Memory management | |
59 void oops_do(OopClosure* f); | |
60 | |
61 // Tells whether the addr point into the monitors. | |
62 bool contains(void* addr) const { return (addr >= (void*) monitors()) && (addr < (void*) (monitors() + number_of_monitors())); } | |
63 }; | |
1972 | 64 |
65 #endif // SHARE_VM_RUNTIME_MONITORCHUNK_HPP |