1/*
2 * Copyright (c) 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 *
23 */
24
25#include "precompiled.hpp"
26#include "code/compiledMethod.hpp"
27#include "code/nmethod.hpp"
28#include "gc/shared/gcBehaviours.hpp"
29
30IsUnloadingBehaviour* IsUnloadingBehaviour::_current = NULL;
31
32class IsCompiledMethodUnloadingOopClosure: public OopClosure {
33 BoolObjectClosure *_cl;
34 bool _is_unloading;
35
36public:
37 IsCompiledMethodUnloadingOopClosure(BoolObjectClosure* cl)
38 : _cl(cl),
39 _is_unloading(false)
40 { }
41
42 virtual void do_oop(oop* p) {
43 if (_is_unloading) {
44 return;
45 }
46 oop obj = *p;
47 if (obj == NULL) {
48 return;
49 }
50 if (!_cl->do_object_b(obj)) {
51 _is_unloading = true;
52 }
53 }
54
55 virtual void do_oop(narrowOop* p) {
56 ShouldNotReachHere();
57 }
58
59 bool is_unloading() const {
60 return _is_unloading;
61 }
62};
63
64bool ClosureIsUnloadingBehaviour::is_unloading(CompiledMethod* cm) const {
65 if (cm->is_nmethod()) {
66 IsCompiledMethodUnloadingOopClosure cl(_cl);
67 static_cast<nmethod*>(cm)->oops_do(&cl, true /* allow_dead */);
68 return cl.is_unloading();
69 } else {
70 return false;
71 }
72}
73