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comparison src/share/vm/oops/markOop.inline.hpp @ 2044:06f017f7daa7

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Merge.
author Thomas Wuerthinger <wuerthinger@ssw.jku.at>
date Fri, 07 Jan 2011 18:18:08 +0100
parents 74ee0db180fa
children da91efe96a93
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1942:00bc9eaf0e24 2044:06f017f7daa7
1 /* 1 /*
2 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. 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. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
20 * or visit www.oracle.com if you need additional information or have any 20 * or visit www.oracle.com if you need additional information or have any
21 * questions. 21 * questions.
22 * 22 *
23 */ 23 */
24 24
25 // Should this header be preserved during GC? 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 (when biased locking is enabled)?
26 inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const { 34 inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const {
27 assert(UseBiasedLocking, "unexpected"); 35 assert(UseBiasedLocking, "unexpected");
28 if (has_bias_pattern()) { 36 if (has_bias_pattern()) {
29 // Will reset bias at end of collection 37 // Will reset bias at end of collection
30 // Mark words of biased and currently locked objects are preserved separately 38 // Mark words of biased and currently locked objects are preserved separately
37 return true; 45 return true;
38 } 46 }
39 return (!is_unlocked() || !has_no_hash()); 47 return (!is_unlocked() || !has_no_hash());
40 } 48 }
41 49
50 // Should this header be preserved during GC?
42 inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const { 51 inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const {
43 if (!UseBiasedLocking) 52 if (!UseBiasedLocking)
44 return (!is_unlocked() || !has_no_hash()); 53 return (!is_unlocked() || !has_no_hash());
45 return must_be_preserved_with_bias(obj_containing_mark); 54 return must_be_preserved_with_bias(obj_containing_mark);
46 } 55 }
47 56
48 // Should this header (including its age bits) be preserved in the 57 // Should this header be preserved in the case of a promotion failure
49 // case of a promotion failure during scavenge? 58 // during scavenge (when biased locking is enabled)?
50 inline bool markOopDesc::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const { 59 inline bool markOopDesc::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const {
51 assert(UseBiasedLocking, "unexpected"); 60 assert(UseBiasedLocking, "unexpected");
52 // We don't explicitly save off the mark words of biased and 61 // We don't explicitly save off the mark words of biased and
53 // currently-locked objects during scavenges, so if during a 62 // currently-locked objects during scavenges, so if during a
54 // promotion failure we encounter either a biased mark word or a 63 // promotion failure we encounter either a biased mark word or a
60 // of a scavenge when a promotion failure has first been detected. 69 // of a scavenge when a promotion failure has first been detected.
61 if (has_bias_pattern() || 70 if (has_bias_pattern() ||
62 prototype_for_object(obj_containing_mark)->has_bias_pattern()) { 71 prototype_for_object(obj_containing_mark)->has_bias_pattern()) {
63 return true; 72 return true;
64 } 73 }
65 return (this != prototype()); 74 return (!is_unlocked() || !has_no_hash());
66 } 75 }
67 76
77 // Should this header be preserved in the case of a promotion failure
78 // during scavenge?
68 inline bool markOopDesc::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const { 79 inline bool markOopDesc::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const {
69 if (!UseBiasedLocking) 80 if (!UseBiasedLocking)
70 return (this != prototype()); 81 return (!is_unlocked() || !has_no_hash());
71 return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark); 82 return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark);
72 } 83 }
73 84
74 85
75 // Should this header (including its age bits) be preserved in the 86 // Same as must_be_preserved_with_bias_for_promotion_failure() except that
76 // case of a scavenge in which CMS is the old generation? 87 // it takes a klassOop argument, instead of the object of which this is the mark word.
77 inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const { 88 inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const {
78 assert(UseBiasedLocking, "unexpected"); 89 assert(UseBiasedLocking, "unexpected");
79 // CMS scavenges preserve mark words in similar fashion to promotion failures; see above 90 // CMS scavenges preserve mark words in similar fashion to promotion failures; see above
80 if (has_bias_pattern() || 91 if (has_bias_pattern() ||
81 klass_of_obj_containing_mark->klass_part()->prototype_header()->has_bias_pattern()) { 92 klass_of_obj_containing_mark->klass_part()->prototype_header()->has_bias_pattern()) {
82 return true; 93 return true;
83 } 94 }
84 return (this != prototype()); 95 return (!is_unlocked() || !has_no_hash());
85 } 96 }
97
98 // Same as must_be_preserved_for_promotion_failure() except that
99 // it takes a klassOop argument, instead of the object of which this is the mark word.
86 inline bool markOopDesc::must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const { 100 inline bool markOopDesc::must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const {
87 if (!UseBiasedLocking) 101 if (!UseBiasedLocking)
88 return (this != prototype()); 102 return (!is_unlocked() || !has_no_hash());
89 return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark); 103 return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark);
90 } 104 }
91 105
92 inline markOop markOopDesc::prototype_for_object(oop obj) { 106 inline markOop markOopDesc::prototype_for_object(oop obj) {
93 #ifdef ASSERT 107 #ifdef ASSERT
94 markOop prototype_header = obj->klass()->klass_part()->prototype_header(); 108 markOop prototype_header = obj->klass()->klass_part()->prototype_header();
95 assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header"); 109 assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header");
96 #endif 110 #endif
97 return obj->klass()->klass_part()->prototype_header(); 111 return obj->klass()->klass_part()->prototype_header();
98 } 112 }
113
114 #endif // SHARE_VM_OOPS_MARKOOP_INLINE_HPP