1 /*
 2  * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
 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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24 
25 #ifndef SHARE_GC_SHARED_PRESERVEDMARKS_INLINE_HPP
26 #define SHARE_GC_SHARED_PRESERVEDMARKS_INLINE_HPP
27 
28 #include "gc/shared/preservedMarks.hpp"
29 
30 #include "logging/log.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "utilities/stack.inline.hpp"
33 
34 inline bool PreservedMarks::should_preserve_mark(oop obj, markWord m) const {
35   return obj->mark_must_be_preserved_for_promotion_failure(m);
36 }
37 
38 inline void PreservedMarks::push(oop obj, markWord m) {
39   assert(should_preserve_mark(obj, m), "pre-condition");
40   OopAndMarkWord elem(obj, m);
41   _stack.push(elem);
42 }
43 
44 inline void PreservedMarks::push_if_necessary(oop obj, markWord m) {
45   if (should_preserve_mark(obj, m)) {
46     push(obj, m);
47   }
48 }
49 
50 inline void PreservedMarks::push_always(oop obj, markWord m) {
51   assert(!m.is_marked(), "precondition");
52   OopAndMarkWord elem(obj, m);
53   _stack.push(elem);
54 }
55 
56 inline void PreservedMarks::init_forwarded_mark(oop obj) {
57   obj->init_mark();
58 }
59 
60 inline PreservedMarks::PreservedMarks()
61     : _stack(OopAndMarkWordStack::default_segment_size(),
62              // This stack should be used very infrequently so there's
63              // no point in caching stack segments (there will be a
64              // waste of space most of the time). So we set the max
65              // cache size to 0.
66              0 /* max_cache_size */) { }
67 
68 void PreservedMarks::OopAndMarkWord::set_mark() const {
69   _o->set_mark(_m);
70 }
71 
72 #endif // SHARE_GC_SHARED_PRESERVEDMARKS_INLINE_HPP