1 /*
2 * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #include "precompiled.hpp"
25
26 #include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp"
27 #include "gc/shenandoah/shenandoahClosures.inline.hpp"
28 #include "gc/shenandoah/shenandoahCodeRoots.hpp"
29 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
30 #include "gc/shenandoah/shenandoahLock.hpp"
31 #include "gc/shenandoah/shenandoahNMethod.inline.hpp"
32 #include "gc/shenandoah/shenandoahThreadLocalData.hpp"
33 #include "memory/iterator.hpp"
34 #include "memory/resourceArea.hpp"
35
nmethod_entry_barrier(nmethod * nm)36 bool ShenandoahBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
37 ShenandoahReentrantLock* lock = ShenandoahNMethod::lock_for_nmethod(nm);
38 assert(lock != NULL, "Must be");
39 ShenandoahReentrantLocker locker(lock);
40
41 if (!is_armed(nm)) {
42 // Some other thread got here first and healed the oops
43 // and disarmed the nmethod.
44 return true;
45 }
46
47 if (nm->is_unloading()) {
48 // We don't need to take the lock when unlinking nmethods from
49 // the Method, because it is only concurrently unlinked by
50 // the entry barrier, which acquires the per nmethod lock.
51 nm->unlink_from_method();
52
53 // We can end up calling nmethods that are unloading
54 // since we clear compiled ICs lazily. Returning false
55 // will re-resovle the call and update the compiled IC.
56 return false;
57 }
58
59 // Heal oops and disarm
60 ShenandoahNMethod::heal_nmethod(nm);
61 ShenandoahNMethod::disarm_nmethod(nm);
62 return true;
63 }
64
disarmed_value() const65 int ShenandoahBarrierSetNMethod::disarmed_value() const {
66 return ShenandoahCodeRoots::disarmed_value();
67 }
68
thread_disarmed_offset() const69 ByteSize ShenandoahBarrierSetNMethod::thread_disarmed_offset() const {
70 return ShenandoahThreadLocalData::disarmed_value_offset();
71 }
72
disarmed_value_address() const73 int* ShenandoahBarrierSetNMethod::disarmed_value_address() const {
74 return ShenandoahCodeRoots::disarmed_value_address();
75 }
76