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src/share/vm/oops/markOop.inline.hpp@80e866b1d053 (annotated)
src/share/vm/oops/markOop.inline.hpp
Fri, 16 Nov 2012 09:19:12 -0500
- author
- coleenp
- date
- Fri, 16 Nov 2012 09:19:12 -0500
- changeset 4280
- 80e866b1d053
- parent 4037
- da91efe96a93
- child 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
Merge
| duke@435 | 1 | /* |
| coleenp@4037 | 2 | * Copyright (c) 2006, 2012, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #ifndef SHARE_VM_OOPS_MARKOOP_INLINE_HPP |
| stefank@2314 | 26 | #define SHARE_VM_OOPS_MARKOOP_INLINE_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "oops/klass.hpp" |
| stefank@2314 | 29 | #include "oops/markOop.hpp" |
| stefank@2314 | 30 | #include "runtime/globals.hpp" |
| stefank@2314 | 31 | |
| ysr@2380 | 32 | // Should this header be preserved during GC (when biased locking is enabled)? |
| duke@435 | 33 | inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const { |
| duke@435 | 34 | assert(UseBiasedLocking, "unexpected"); |
| duke@435 | 35 | if (has_bias_pattern()) { |
| duke@435 | 36 | // Will reset bias at end of collection |
| duke@435 | 37 | // Mark words of biased and currently locked objects are preserved separately |
| duke@435 | 38 | return false; |
| duke@435 | 39 | } |
| duke@435 | 40 | markOop prototype_header = prototype_for_object(obj_containing_mark); |
| duke@435 | 41 | if (prototype_header->has_bias_pattern()) { |
| duke@435 | 42 | // Individual instance which has its bias revoked; must return |
| duke@435 | 43 | // true for correctness |
| duke@435 | 44 | return true; |
| duke@435 | 45 | } |
| duke@435 | 46 | return (!is_unlocked() || !has_no_hash()); |
| duke@435 | 47 | } |
| duke@435 | 48 | |
| ysr@2380 | 49 | // Should this header be preserved during GC? |
| ysr@777 | 50 | inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const { |
| ysr@777 | 51 | if (!UseBiasedLocking) |
| ysr@777 | 52 | return (!is_unlocked() || !has_no_hash()); |
| ysr@777 | 53 | return must_be_preserved_with_bias(obj_containing_mark); |
| ysr@777 | 54 | } |
| ysr@777 | 55 | |
| ysr@2380 | 56 | // Should this header be preserved in the case of a promotion failure |
| ysr@2380 | 57 | // during scavenge (when biased locking is enabled)? |
| duke@435 | 58 | inline bool markOopDesc::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const { |
| duke@435 | 59 | assert(UseBiasedLocking, "unexpected"); |
| duke@435 | 60 | // We don't explicitly save off the mark words of biased and |
| duke@435 | 61 | // currently-locked objects during scavenges, so if during a |
| duke@435 | 62 | // promotion failure we encounter either a biased mark word or a |
| duke@435 | 63 | // klass which still has a biasable prototype header, we have to |
| duke@435 | 64 | // preserve the mark word. This results in oversaving, but promotion |
| duke@435 | 65 | // failures are rare, and this avoids adding more complex logic to |
| duke@435 | 66 | // the scavengers to call new variants of |
| duke@435 | 67 | // BiasedLocking::preserve_marks() / restore_marks() in the middle |
| duke@435 | 68 | // of a scavenge when a promotion failure has first been detected. |
| duke@435 | 69 | if (has_bias_pattern() || |
| duke@435 | 70 | prototype_for_object(obj_containing_mark)->has_bias_pattern()) { |
| duke@435 | 71 | return true; |
| duke@435 | 72 | } |
| ysr@2380 | 73 | return (!is_unlocked() || !has_no_hash()); |
| duke@435 | 74 | } |
| duke@435 | 75 | |
| ysr@2380 | 76 | // Should this header be preserved in the case of a promotion failure |
| ysr@2380 | 77 | // during scavenge? |
| ysr@777 | 78 | inline bool markOopDesc::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const { |
| ysr@777 | 79 | if (!UseBiasedLocking) |
| ysr@2380 | 80 | return (!is_unlocked() || !has_no_hash()); |
| ysr@777 | 81 | return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark); |
| ysr@777 | 82 | } |
| ysr@777 | 83 | |
| ysr@777 | 84 | |
| ysr@2380 | 85 | // Same as must_be_preserved_with_bias_for_promotion_failure() except that |
| coleenp@4037 | 86 | // it takes a Klass* argument, instead of the object of which this is the mark word. |
| coleenp@4037 | 87 | inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const { |
| duke@435 | 88 | assert(UseBiasedLocking, "unexpected"); |
| duke@435 | 89 | // CMS scavenges preserve mark words in similar fashion to promotion failures; see above |
| duke@435 | 90 | if (has_bias_pattern() || |
| coleenp@4037 | 91 | klass_of_obj_containing_mark->prototype_header()->has_bias_pattern()) { |
| duke@435 | 92 | return true; |
| duke@435 | 93 | } |
| ysr@2380 | 94 | return (!is_unlocked() || !has_no_hash()); |
| duke@435 | 95 | } |
| ysr@2380 | 96 | |
| ysr@2380 | 97 | // Same as must_be_preserved_for_promotion_failure() except that |
| coleenp@4037 | 98 | // it takes a Klass* argument, instead of the object of which this is the mark word. |
| coleenp@4037 | 99 | inline bool markOopDesc::must_be_preserved_for_cms_scavenge(Klass* klass_of_obj_containing_mark) const { |
| ysr@777 | 100 | if (!UseBiasedLocking) |
| ysr@2380 | 101 | return (!is_unlocked() || !has_no_hash()); |
| ysr@777 | 102 | return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark); |
| ysr@777 | 103 | } |
| duke@435 | 104 | |
| duke@435 | 105 | inline markOop markOopDesc::prototype_for_object(oop obj) { |
| duke@435 | 106 | #ifdef ASSERT |
| coleenp@4037 | 107 | markOop prototype_header = obj->klass()->prototype_header(); |
| duke@435 | 108 | assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header"); |
| duke@435 | 109 | #endif |
| coleenp@4037 | 110 | return obj->klass()->prototype_header(); |
| duke@435 | 111 | } |
| stefank@2314 | 112 | |
| stefank@2314 | 113 | #endif // SHARE_VM_OOPS_MARKOOP_INLINE_HPP |
