Mon, 25 Jun 2012 21:33:35 -0400
7178670: runtime/7158800/BadUtf8.java fails in SymbolTable::rehash_table
Summary: Cannot delete _buckets and HashtableEntries in shared space (CDS)
Reviewed-by: acorn, kvn, dlong, dcubed, kamg
1 /*
2 * Copyright (c) 2005, 2011, 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.
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23 */
25 #ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
26 #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
28 #ifndef SERIALGC
29 #include "gc_implementation/parNew/parNewGeneration.hpp"
30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
31 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
32 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
33 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
34 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
35 #endif
37 inline void oopDesc::update_contents(ParCompactionManager* cm) {
38 // The klass field must be updated before anything else
39 // can be done.
40 DEBUG_ONLY(klassOopDesc* original_klass = klass());
42 // Can the option to update and/or copy be moved up in the
43 // call chain to avoid calling into here?
45 if (PSParallelCompact::should_update_klass(klass())) {
46 update_header();
47 assert(klass()->is_klass(), "Not updated correctly");
48 } else {
49 assert(klass()->is_klass(), "Not updated");
50 }
52 Klass* new_klass = blueprint();
53 if (!new_klass->oop_is_typeArray()) {
54 // It might contain oops beyond the header, so take the virtual call.
55 new_klass->oop_update_pointers(cm, this);
56 }
57 // Else skip it. The typeArrayKlass in the header never needs scavenging.
58 }
60 inline void oopDesc::follow_contents(ParCompactionManager* cm) {
61 assert (PSParallelCompact::mark_bitmap()->is_marked(this),
62 "should be marked");
63 blueprint()->oop_follow_contents(cm, this);
64 }
66 // Used by parallel old GC.
68 inline void oopDesc::follow_header(ParCompactionManager* cm) {
69 if (UseCompressedOops) {
70 PSParallelCompact::mark_and_push(cm, compressed_klass_addr());
71 } else {
72 PSParallelCompact::mark_and_push(cm, klass_addr());
73 }
74 }
76 inline oop oopDesc::forward_to_atomic(oop p) {
77 assert(ParNewGeneration::is_legal_forward_ptr(p),
78 "illegal forwarding pointer value.");
79 markOop oldMark = mark();
80 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
81 markOop curMark;
83 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
84 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
86 while (!oldMark->is_marked()) {
87 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
88 assert(is_forwarded(), "object should have been forwarded");
89 if (curMark == oldMark) {
90 return NULL;
91 }
92 // If the CAS was unsuccessful then curMark->is_marked()
93 // should return true as another thread has CAS'd in another
94 // forwarding pointer.
95 oldMark = curMark;
96 }
97 return forwardee();
98 }
100 inline void oopDesc::update_header() {
101 if (UseCompressedOops) {
102 PSParallelCompact::adjust_pointer(compressed_klass_addr());
103 } else {
104 PSParallelCompact::adjust_pointer(klass_addr());
105 }
106 }
108 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP