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annotate src/share/vm/oops/markOop.inline.hpp @ 15457:c0e1a8693e0e
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author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 01 May 2014 11:51:45 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 2006, 2012, 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_OOPS_MARKOOP_INLINE_HPP |
26 #define SHARE_VM_OOPS_MARKOOP_INLINE_HPP | |
27 | |
28 #include "oops/klass.hpp" | |
29 #include "oops/markOop.hpp" | |
30 #include "runtime/globals.hpp" | |
31 | |
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32 // Should this header be preserved during GC (when biased locking is enabled)? |
0 | 33 inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const { |
34 assert(UseBiasedLocking, "unexpected"); | |
35 if (has_bias_pattern()) { | |
36 // Will reset bias at end of collection | |
37 // Mark words of biased and currently locked objects are preserved separately | |
38 return false; | |
39 } | |
40 markOop prototype_header = prototype_for_object(obj_containing_mark); | |
41 if (prototype_header->has_bias_pattern()) { | |
42 // Individual instance which has its bias revoked; must return | |
43 // true for correctness | |
44 return true; | |
45 } | |
46 return (!is_unlocked() || !has_no_hash()); | |
47 } | |
48 | |
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49 // Should this header be preserved during GC? |
342 | 50 inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const { |
51 if (!UseBiasedLocking) | |
52 return (!is_unlocked() || !has_no_hash()); | |
53 return must_be_preserved_with_bias(obj_containing_mark); | |
54 } | |
55 | |
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56 // Should this header be preserved in the case of a promotion failure |
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57 // during scavenge (when biased locking is enabled)? |
0 | 58 inline bool markOopDesc::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const { |
59 assert(UseBiasedLocking, "unexpected"); | |
60 // We don't explicitly save off the mark words of biased and | |
61 // currently-locked objects during scavenges, so if during a | |
62 // promotion failure we encounter either a biased mark word or a | |
63 // klass which still has a biasable prototype header, we have to | |
64 // preserve the mark word. This results in oversaving, but promotion | |
65 // failures are rare, and this avoids adding more complex logic to | |
66 // the scavengers to call new variants of | |
67 // BiasedLocking::preserve_marks() / restore_marks() in the middle | |
68 // of a scavenge when a promotion failure has first been detected. | |
69 if (has_bias_pattern() || | |
70 prototype_for_object(obj_containing_mark)->has_bias_pattern()) { | |
71 return true; | |
72 } | |
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73 return (!is_unlocked() || !has_no_hash()); |
0 | 74 } |
75 | |
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76 // Should this header be preserved in the case of a promotion failure |
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77 // during scavenge? |
342 | 78 inline bool markOopDesc::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const { |
79 if (!UseBiasedLocking) | |
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80 return (!is_unlocked() || !has_no_hash()); |
342 | 81 return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark); |
82 } | |
83 | |
84 | |
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85 // Same as must_be_preserved_with_bias_for_promotion_failure() except that |
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86 // it takes a Klass* argument, instead of the object of which this is the mark word. |
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87 inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const { |
0 | 88 assert(UseBiasedLocking, "unexpected"); |
89 // CMS scavenges preserve mark words in similar fashion to promotion failures; see above | |
90 if (has_bias_pattern() || | |
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91 klass_of_obj_containing_mark->prototype_header()->has_bias_pattern()) { |
0 | 92 return true; |
93 } | |
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94 return (!is_unlocked() || !has_no_hash()); |
0 | 95 } |
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96 |
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97 // Same as must_be_preserved_for_promotion_failure() except that |
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98 // it takes a Klass* argument, instead of the object of which this is the mark word. |
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99 inline bool markOopDesc::must_be_preserved_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const { |
342 | 100 if (!UseBiasedLocking) |
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101 return (!is_unlocked() || !has_no_hash()); |
342 | 102 return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark); |
103 } | |
0 | 104 |
105 inline markOop markOopDesc::prototype_for_object(oop obj) { | |
106 #ifdef ASSERT | |
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107 markOop prototype_header = obj->klass()->prototype_header(); |
0 | 108 assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header"); |
109 #endif | |
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110 return obj->klass()->prototype_header(); |
0 | 111 } |
1972 | 112 |
113 #endif // SHARE_VM_OOPS_MARKOOP_INLINE_HPP |