1 /*
2 * Copyright (c) 2001, 2019, 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 *
41 #include "utilities/align.hpp"
42
43 template <class T>
44 inline void G1ScanClosureBase::prefetch_and_push(T* p, const oop obj) {
45 // We're not going to even bother checking whether the object is
46 // already forwarded or not, as this usually causes an immediate
47 // stall. We'll try to prefetch the object (for write, given that
48 // we might need to install the forwarding reference) and we'll
49 // get back to it when pop it from the queue
50 Prefetch::write(obj->mark_addr_raw(), 0);
51 Prefetch::read(obj->mark_addr_raw(), (HeapWordSize*2));
52
53 // slightly paranoid test; I'm trying to catch potential
54 // problems before we go into push_on_queue to know where the
55 // problem is coming from
56 assert((obj == RawAccess<>::oop_load(p)) ||
57 (obj->is_forwarded() &&
58 obj->forwardee() == RawAccess<>::oop_load(p)),
59 "p should still be pointing to obj or to its forwardee");
60
61 _par_scan_state->push_on_queue(p);
62 }
63
64 template <class T>
65 inline void G1ScanClosureBase::handle_non_cset_obj_common(G1HeapRegionAttr const region_attr, T* p, oop const obj) {
66 if (region_attr.is_humongous()) {
67 _g1h->set_humongous_is_live(obj);
68 } else if (region_attr.is_optional()) {
69 _par_scan_state->remember_reference_into_optional_region(p);
70 }
71 }
72
73 inline void G1ScanClosureBase::trim_queue_partially() {
74 _par_scan_state->trim_queue_partially();
75 }
76
77 template <class T>
78 inline void G1ScanEvacuatedObjClosure::do_oop_work(T* p) {
79 T heap_oop = RawAccess<>::oop_load(p);
80
81 if (CompressedOops::is_null(heap_oop)) {
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1 /*
2 * Copyright (c) 2001, 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
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 *
41 #include "utilities/align.hpp"
42
43 template <class T>
44 inline void G1ScanClosureBase::prefetch_and_push(T* p, const oop obj) {
45 // We're not going to even bother checking whether the object is
46 // already forwarded or not, as this usually causes an immediate
47 // stall. We'll try to prefetch the object (for write, given that
48 // we might need to install the forwarding reference) and we'll
49 // get back to it when pop it from the queue
50 Prefetch::write(obj->mark_addr_raw(), 0);
51 Prefetch::read(obj->mark_addr_raw(), (HeapWordSize*2));
52
53 // slightly paranoid test; I'm trying to catch potential
54 // problems before we go into push_on_queue to know where the
55 // problem is coming from
56 assert((obj == RawAccess<>::oop_load(p)) ||
57 (obj->is_forwarded() &&
58 obj->forwardee() == RawAccess<>::oop_load(p)),
59 "p should still be pointing to obj or to its forwardee");
60
61 _par_scan_state->push_on_queue(ScannerTask(p));
62 }
63
64 template <class T>
65 inline void G1ScanClosureBase::handle_non_cset_obj_common(G1HeapRegionAttr const region_attr, T* p, oop const obj) {
66 if (region_attr.is_humongous()) {
67 _g1h->set_humongous_is_live(obj);
68 } else if (region_attr.is_optional()) {
69 _par_scan_state->remember_reference_into_optional_region(p);
70 }
71 }
72
73 inline void G1ScanClosureBase::trim_queue_partially() {
74 _par_scan_state->trim_queue_partially();
75 }
76
77 template <class T>
78 inline void G1ScanEvacuatedObjClosure::do_oop_work(T* p) {
79 T heap_oop = RawAccess<>::oop_load(p);
80
81 if (CompressedOops::is_null(heap_oop)) {
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