1 /*
2 * Copyright (c) 2019, Red Hat, Inc. 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 #include "precompiled.hpp"
26
27 #include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp"
28 #include "gc/shenandoah/shenandoahClosures.inline.hpp"
29 #include "gc/shenandoah/shenandoahCodeRoots.hpp"
30 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
31 #include "gc/shenandoah/shenandoahLock.hpp"
32 #include "gc/shenandoah/shenandoahNMethod.inline.hpp"
33 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
34 #include "memory/iterator.hpp"
35 #include "memory/resourceArea.hpp"
36
37 bool ShenandoahBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
38 ShenandoahReentrantLock* lock = ShenandoahNMethod::lock_for_nmethod(nm);
39 assert(lock != NULL, "Must be");
40 ShenandoahReentrantLocker locker(lock);
41
42 if (!is_armed(nm)) {
43 // Some other thread got here first and healed the oops
44 // and disarmed the nmethod.
45 return true;
46 }
47
48 if (nm->is_unloading()) {
49 // We don't need to take the lock when unlinking nmethods from
50 // the Method, because it is only concurrently unlinked by
51 // the entry barrier, which acquires the per nmethod lock.
52 nm->unlink_from_method();
53
54 // We can end up calling nmethods that are unloading
55 // since we clear compiled ICs lazily. Returning false
56 // will re-resovle the call and update the compiled IC.
57 return false;
58 }
59
60 // Heal oops and disarm
61 ShenandoahNMethod::heal_nmethod(nm);
62 ShenandoahNMethod::disarm_nmethod(nm);
63 return true;
64 }
65
66 int ShenandoahBarrierSetNMethod::disarmed_value() const {
67 return ShenandoahCodeRoots::disarmed_value();
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1 /*
2 * Copyright (c) 2019, 2020, Red Hat, Inc. 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 #include "precompiled.hpp"
26
27 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
28 #include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp"
29 #include "gc/shenandoah/shenandoahClosures.inline.hpp"
30 #include "gc/shenandoah/shenandoahCodeRoots.hpp"
31 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
32 #include "gc/shenandoah/shenandoahLock.hpp"
33 #include "gc/shenandoah/shenandoahNMethod.inline.hpp"
34 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
35 #include "memory/iterator.hpp"
36 #include "memory/resourceArea.hpp"
37
38 bool ShenandoahBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
39 ShenandoahReentrantLock* lock = ShenandoahNMethod::lock_for_nmethod(nm);
40 assert(lock != NULL, "Must be");
41 ShenandoahReentrantLocker locker(lock);
42
43 if (!is_armed(nm)) {
44 // Some other thread got here first and healed the oops
45 // and disarmed the nmethod.
46 return true;
47 }
48
49 // Mark phase nmethod barrier, keep the nmethod metadata alive
50 if (ShenandoahHeap::heap()->is_concurrent_mark_in_progress()) {
51 ShenandoahNMethod::keep_metadata_alive(nm);
52 ShenandoahNMethod::disarm_nmethod(nm);
53 return true;
54 }
55
56 ShenandoahHeap* const heap = ShenandoahHeap::heap();
57
58 assert(heap->is_concurrent_root_in_progress(), "What else?");
59 if (nm->is_unloading()) {
60 // We don't need to take the lock when unlinking nmethods from
61 // the Method, because it is only concurrently unlinked by
62 // the entry barrier, which acquires the per nmethod lock.
63 nm->unlink_from_method();
64
65 // We can end up calling nmethods that are unloading
66 // since we clear compiled ICs lazily. Returning false
67 // will re-resovle the call and update the compiled IC.
68 return false;
69 }
70
71 // Heal oops and disarm
72 ShenandoahNMethod::heal_nmethod(nm);
73 ShenandoahNMethod::disarm_nmethod(nm);
74 return true;
75 }
76
77 int ShenandoahBarrierSetNMethod::disarmed_value() const {
78 return ShenandoahCodeRoots::disarmed_value();
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