1 /*
 2  * Copyright (c) 2016, 2022, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 5  * This code is free software; you can redistribute it and/or modify it
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 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).
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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(m);
36 }
37 
38 inline void PreservedMarks::push_if_necessary(oop obj, markWord m) {
39   if (should_preserve_mark(obj, m)) {
40     OopAndMarkWord elem(obj, m);
41     _stack.push(elem);
42   }
43 }
44 
45 inline void PreservedMarks::push_always(oop obj, markWord m) {
46   assert(!m.is_marked(), "precondition");
47   OopAndMarkWord elem(obj, m);
48   _stack.push(elem);
49 }
50 
51 inline PreservedMarks::PreservedMarks()
52     : _stack(OopAndMarkWordStack::default_segment_size(),
53              // This stack should be used very infrequently so there's
54              // no point in caching stack segments (there will be a
55              // waste of space most of the time). So we set the max
56              // cache size to 0.
57              0 /* max_cache_size */) { }
58 
59 void PreservedMarks::OopAndMarkWord::set_mark() const {
60   _o->set_mark(_m);
61 }
62 
63 #endif // SHARE_GC_SHARED_PRESERVEDMARKS_INLINE_HPP