1 /*
2 * Copyright (c) 2017, 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 *
95
96 void G1FullGCCompactionPoint::forward(oop object, size_t size) {
97 assert(_current_region != NULL, "Must have been initialized");
98
99 // Ensure the object fit in the current region.
100 while (!object_will_fit(size)) {
101 switch_region();
102 }
103
104 // Store a forwarding pointer if the object should be moved.
105 if ((HeapWord*)object != _compaction_top) {
106 object->forward_to(oop(_compaction_top));
107 } else {
108 if (object->forwardee() != NULL) {
109 // Object should not move but mark-word is used so it looks like the
110 // object is forwarded. Need to clear the mark and it's no problem
111 // since it will be restored by preserved marks. There is an exception
112 // with BiasedLocking, in this case forwardee() will return NULL
113 // even if the mark-word is used. This is no problem since
114 // forwardee() will return NULL in the compaction phase as well.
115 object->init_mark();
116 } else {
117 // Make sure object has the correct mark-word set or that it will be
118 // fixed when restoring the preserved marks.
119 assert(object->mark() == markOopDesc::prototype_for_object(object) || // Correct mark
120 object->mark()->must_be_preserved(object) || // Will be restored by PreservedMarksSet
121 (UseBiasedLocking && object->has_bias_pattern()), // Will be restored by BiasedLocking
122 "should have correct prototype obj: " PTR_FORMAT " mark: " PTR_FORMAT " prototype: " PTR_FORMAT,
123 p2i(object), p2i(object->mark()), p2i(markOopDesc::prototype_for_object(object)));
124 }
125 assert(object->forwardee() == NULL, "should be forwarded to NULL");
126 }
127
128 // Update compaction values.
129 _compaction_top += size;
130 if (_compaction_top > _threshold) {
131 _threshold = _current_region->cross_threshold(_compaction_top - size, _compaction_top);
132 }
133 }
134
135 void G1FullGCCompactionPoint::add(HeapRegion* hr) {
136 _compaction_regions->append(hr);
137 }
138
139 void G1FullGCCompactionPoint::merge(G1FullGCCompactionPoint* other) {
140 _compaction_regions->appendAll(other->regions());
141 }
142
143 HeapRegion* G1FullGCCompactionPoint::remove_last() {
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1 /*
2 * Copyright (c) 2017, 2018 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 *
95
96 void G1FullGCCompactionPoint::forward(oop object, size_t size) {
97 assert(_current_region != NULL, "Must have been initialized");
98
99 // Ensure the object fit in the current region.
100 while (!object_will_fit(size)) {
101 switch_region();
102 }
103
104 // Store a forwarding pointer if the object should be moved.
105 if ((HeapWord*)object != _compaction_top) {
106 object->forward_to(oop(_compaction_top));
107 } else {
108 if (object->forwardee() != NULL) {
109 // Object should not move but mark-word is used so it looks like the
110 // object is forwarded. Need to clear the mark and it's no problem
111 // since it will be restored by preserved marks. There is an exception
112 // with BiasedLocking, in this case forwardee() will return NULL
113 // even if the mark-word is used. This is no problem since
114 // forwardee() will return NULL in the compaction phase as well.
115 object->init_mark_raw();
116 } else {
117 // Make sure object has the correct mark-word set or that it will be
118 // fixed when restoring the preserved marks.
119 assert(object->mark_raw() == markOopDesc::prototype_for_object(object) || // Correct mark
120 object->mark_raw()->must_be_preserved(object) || // Will be restored by PreservedMarksSet
121 (UseBiasedLocking && object->has_bias_pattern_raw()), // Will be restored by BiasedLocking
122 "should have correct prototype obj: " PTR_FORMAT " mark: " PTR_FORMAT " prototype: " PTR_FORMAT,
123 p2i(object), p2i(object->mark_raw()), p2i(markOopDesc::prototype_for_object(object)));
124 }
125 assert(object->forwardee() == NULL, "should be forwarded to NULL");
126 }
127
128 // Update compaction values.
129 _compaction_top += size;
130 if (_compaction_top > _threshold) {
131 _threshold = _current_region->cross_threshold(_compaction_top - size, _compaction_top);
132 }
133 }
134
135 void G1FullGCCompactionPoint::add(HeapRegion* hr) {
136 _compaction_regions->append(hr);
137 }
138
139 void G1FullGCCompactionPoint::merge(G1FullGCCompactionPoint* other) {
140 _compaction_regions->appendAll(other->regions());
141 }
142
143 HeapRegion* G1FullGCCompactionPoint::remove_last() {
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