1 /*
2 * Copyright (c) 2017, 2026, 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
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_GC_G1_G1FULLGCMARKER_INLINE_HPP
26 #define SHARE_GC_G1_G1FULLGCMARKER_INLINE_HPP
27
28 #include "gc/g1/g1FullGCMarker.hpp"
29
30 #include "classfile/classLoaderData.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "gc/g1/g1Allocator.inline.hpp"
33 #include "gc/g1/g1ConcurrentMarkBitMap.inline.hpp"
34 #include "gc/g1/g1FullCollector.inline.hpp"
35 #include "gc/g1/g1FullGCOopClosures.inline.hpp"
36 #include "gc/g1/g1OopClosures.inline.hpp"
37 #include "gc/g1/g1RegionMarkStatsCache.hpp"
38 #include "gc/g1/g1StringDedup.hpp"
39 #include "gc/shared/continuationGCSupport.inline.hpp"
40 #include "gc/shared/preservedMarks.inline.hpp"
41 #include "gc/shared/stringdedup/stringDedup.hpp"
42 #include "oops/access.inline.hpp"
43 #include "oops/compressedOops.inline.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "utilities/checkedCast.hpp"
46 #include "utilities/debug.hpp"
47
48 inline bool G1FullGCMarker::mark_object(oop obj) {
49 // Try to mark.
50 if (!_bitmap->par_mark(obj)) {
51 // Lost mark race.
52 return false;
53 }
54
55 // Check if deduplicatable string.
56 if (StringDedup::is_enabled() &&
57 java_lang_String::is_instance(obj) &&
58 G1StringDedup::is_candidate_from_mark(obj)) {
59 _string_dedup_requests.add(obj);
60 }
61
62 ContinuationGCSupport::transform_stack_chunk(obj);
63
64 // Collect live words.
65 _mark_stats_cache.add_live_words(obj);
66
67 return true;
68 }
69
70 template <class T> inline void G1FullGCMarker::mark_and_push(T* p) {
71 T heap_oop = RawAccess<>::oop_load(p);
72 if (!CompressedOops::is_null(heap_oop)) {
73 oop obj = CompressedOops::decode_not_null(heap_oop);
74 if (mark_object(obj)) {
75 _task_queue.push(ScannerTask(obj));
76 }
77 assert(_bitmap->is_marked(obj), "Must be marked");
78 }
79 }
80
81 inline bool G1FullGCMarker::is_task_queue_empty() {
82 return _task_queue.is_empty();
83 }
84
85 inline void G1FullGCMarker::process_array_chunk(objArrayOop obj, size_t start, size_t end) {
86 obj->oop_iterate_elements_range(mark_closure(),
87 checked_cast<int>(start),
88 checked_cast<int>(end));
89 }
90
91 inline void G1FullGCMarker::dispatch_task(const ScannerTask& task, bool stolen) {
92 if (task.is_partial_array_state()) {
93 assert(_bitmap->is_marked(task.to_partial_array_state()->source()), "should be marked");
94 process_partial_array(task.to_partial_array_state(), stolen);
95 } else {
96 oop obj = task.to_oop();
97 assert(_bitmap->is_marked(obj), "should be marked");
98 if (obj->is_objArray()) {
99 // Handle object arrays explicitly to allow them to
100 // be split into chunks if needed.
101 start_partial_array_processing((objArrayOop)obj);
102 } else {
103 obj->oop_iterate(mark_closure());
104 }
105 }
106 }
107
108 inline void G1FullGCMarker::publish_and_drain_oop_tasks() {
109 ScannerTask task;
110 while (_task_queue.pop_overflow(task)) {
111 if (!_task_queue.try_push_to_taskqueue(task)) {
112 dispatch_task(task, false);
113 }
114 }
115 while (_task_queue.pop_local(task)) {
116 dispatch_task(task, false);
117 }
118 }
119
120 void G1FullGCMarker::process_marking_stacks() {
121 do {
122 publish_and_drain_oop_tasks();
123 } while (!is_task_queue_empty());
124 }
125
126 #endif // SHARE_GC_G1_G1FULLGCMARKER_INLINE_HPP