1 /*
2 * Copyright (c) 2006, 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 // Should this header be preserved during GC?
26 inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const {
27 assert(UseBiasedLocking, "unexpected");
28 if (has_bias_pattern()) {
29 // Will reset bias at end of collection
30 // Mark words of biased and currently locked objects are preserved separately
31 return false;
32 }
33 markOop prototype_header = prototype_for_object(obj_containing_mark);
34 if (prototype_header->has_bias_pattern()) {
35 // Individual instance which has its bias revoked; must return
36 // true for correctness
37 return true;
38 }
39 return (!is_unlocked() || !has_no_hash());
40 }
41
42 inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const {
43 if (!UseBiasedLocking)
44 return (!is_unlocked() || !has_no_hash());
79 // CMS scavenges preserve mark words in similar fashion to promotion failures; see above
80 if (has_bias_pattern() ||
81 klass_of_obj_containing_mark->klass_part()->prototype_header()->has_bias_pattern()) {
82 return true;
83 }
84 return (this != prototype());
85 }
86 inline bool markOopDesc::must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const {
87 if (!UseBiasedLocking)
88 return (this != prototype());
89 return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark);
90 }
91
92 inline markOop markOopDesc::prototype_for_object(oop obj) {
93 #ifdef ASSERT
94 markOop prototype_header = obj->klass()->klass_part()->prototype_header();
95 assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header");
96 #endif
97 return obj->klass()->klass_part()->prototype_header();
98 }
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1 /*
2 * Copyright (c) 2006, 2010, 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_OOPS_MARKOOP_INLINE_HPP
26 #define SHARE_VM_OOPS_MARKOOP_INLINE_HPP
27
28 #include "oops/klass.hpp"
29 #include "oops/klassOop.hpp"
30 #include "oops/markOop.hpp"
31 #include "runtime/globals.hpp"
32
33 // Should this header be preserved during GC?
34 inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const {
35 assert(UseBiasedLocking, "unexpected");
36 if (has_bias_pattern()) {
37 // Will reset bias at end of collection
38 // Mark words of biased and currently locked objects are preserved separately
39 return false;
40 }
41 markOop prototype_header = prototype_for_object(obj_containing_mark);
42 if (prototype_header->has_bias_pattern()) {
43 // Individual instance which has its bias revoked; must return
44 // true for correctness
45 return true;
46 }
47 return (!is_unlocked() || !has_no_hash());
48 }
49
50 inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const {
51 if (!UseBiasedLocking)
52 return (!is_unlocked() || !has_no_hash());
87 // CMS scavenges preserve mark words in similar fashion to promotion failures; see above
88 if (has_bias_pattern() ||
89 klass_of_obj_containing_mark->klass_part()->prototype_header()->has_bias_pattern()) {
90 return true;
91 }
92 return (this != prototype());
93 }
94 inline bool markOopDesc::must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const {
95 if (!UseBiasedLocking)
96 return (this != prototype());
97 return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark);
98 }
99
100 inline markOop markOopDesc::prototype_for_object(oop obj) {
101 #ifdef ASSERT
102 markOop prototype_header = obj->klass()->klass_part()->prototype_header();
103 assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header");
104 #endif
105 return obj->klass()->klass_part()->prototype_header();
106 }
107
108 #endif // SHARE_VM_OOPS_MARKOOP_INLINE_HPP
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