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annotate src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp @ 1562:dfe27f03244a
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2002, 2008, 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 | |
25 inline PSPromotionManager* PSPromotionManager::manager_array(int index) { | |
26 assert(_manager_array != NULL, "access of NULL manager_array"); | |
27 assert(index >= 0 && index <= (int)ParallelGCThreads, "out of range manager_array access"); | |
28 return _manager_array[index]; | |
29 } | |
30 | |
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31 template <class T> |
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32 inline void PSPromotionManager::claim_or_forward_internal_depth(T* p) { |
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33 if (p != NULL) { // XXX: error if p != NULL here |
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34 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 35 if (o->is_forwarded()) { |
36 o = o->forwardee(); | |
37 // Card mark | |
38 if (PSScavenge::is_obj_in_young((HeapWord*) o)) { | |
39 PSScavenge::card_table()->inline_write_ref_field_gc(p, o); | |
40 } | |
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41 oopDesc::encode_store_heap_oop_not_null(p, o); |
0 | 42 } else { |
43 push_depth(p); | |
44 } | |
45 } | |
46 } | |
47 | |
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48 template <class T> |
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49 inline void PSPromotionManager::claim_or_forward_internal_breadth(T* p) { |
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50 if (p != NULL) { // XXX: error if p != NULL here |
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51 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 52 if (o->is_forwarded()) { |
53 o = o->forwardee(); | |
54 } else { | |
55 o = copy_to_survivor_space(o, false); | |
56 } | |
57 // Card mark | |
58 if (PSScavenge::is_obj_in_young((HeapWord*) o)) { | |
59 PSScavenge::card_table()->inline_write_ref_field_gc(p, o); | |
60 } | |
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61 oopDesc::encode_store_heap_oop_not_null(p, o); |
0 | 62 } |
63 } | |
64 | |
65 inline void PSPromotionManager::flush_prefetch_queue() { | |
66 assert(!depth_first(), "invariant"); | |
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67 for (int i = 0; i < _prefetch_queue.length(); i++) { |
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68 claim_or_forward_internal_breadth((oop*)_prefetch_queue.pop()); |
0 | 69 } |
70 } | |
71 | |
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72 template <class T> |
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73 inline void PSPromotionManager::claim_or_forward_depth(T* p) { |
0 | 74 assert(depth_first(), "invariant"); |
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75 assert(PSScavenge::should_scavenge(p, true), "revisiting object?"); |
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76 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, |
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77 "Sanity"); |
0 | 78 assert(Universe::heap()->is_in(p), "pointer outside heap"); |
79 | |
80 claim_or_forward_internal_depth(p); | |
81 } | |
82 | |
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83 template <class T> |
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84 inline void PSPromotionManager::claim_or_forward_breadth(T* p) { |
0 | 85 assert(!depth_first(), "invariant"); |
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86 assert(PSScavenge::should_scavenge(p, true), "revisiting object?"); |
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87 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, |
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88 "Sanity"); |
0 | 89 assert(Universe::heap()->is_in(p), "pointer outside heap"); |
90 | |
91 if (UsePrefetchQueue) { | |
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92 claim_or_forward_internal_breadth((T*)_prefetch_queue.push_and_pop(p)); |
0 | 93 } else { |
94 // This option is used for testing. The use of the prefetch | |
95 // queue can delay the processing of the objects and thus | |
96 // change the order of object scans. For example, remembered | |
97 // set updates are typically the clearing of the remembered | |
98 // set (the cards) followed by updates of the remembered set | |
99 // for young-to-old pointers. In a situation where there | |
100 // is an error in the sequence of clearing and updating | |
101 // (e.g. clear card A, update card A, erroneously clear | |
102 // card A again) the error can be obscured by a delay | |
103 // in the update due to the use of the prefetch queue | |
104 // (e.g., clear card A, erroneously clear card A again, | |
105 // update card A that was pushed into the prefetch queue | |
106 // and thus delayed until after the erronous clear). The | |
107 // length of the delay is random depending on the objects | |
108 // in the queue and the delay can be zero. | |
109 claim_or_forward_internal_breadth(p); | |
110 } | |
111 } | |
112 | |
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113 inline void PSPromotionManager::process_popped_location_depth(StarTask p) { |
0 | 114 if (is_oop_masked(p)) { |
115 assert(PSChunkLargeArrays, "invariant"); | |
116 oop const old = unmask_chunked_array_oop(p); | |
117 process_array_chunk(old); | |
118 } else { | |
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119 if (p.is_narrow()) { |
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120 assert(UseCompressedOops, "Error"); |
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121 PSScavenge::copy_and_push_safe_barrier(this, (narrowOop*)p); |
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122 } else { |
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123 PSScavenge::copy_and_push_safe_barrier(this, (oop*)p); |
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124 } |
0 | 125 } |
126 } |