Mercurial > hg > truffle
annotate src/share/vm/oops/markOop.inline.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 74ee0db180fa |
| children |
| rev | line source |
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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 |