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 */
23
24 #include "precompiled.hpp"
25 #include "gc/shared/preservedMarks.inline.hpp"
26 #include "unittest.hpp"
27
28 class ScopedDisabledBiasedLocking {
29 bool _orig;
30 public:
31 ScopedDisabledBiasedLocking() : _orig(UseBiasedLocking) { UseBiasedLocking = false; }
32 ~ScopedDisabledBiasedLocking() { UseBiasedLocking = _orig; }
33 };
34
35 // Class to create a "fake" oop with a mark that will
36 // return true for calls to must_be_preserved().
37 class FakeOop {
38 oopDesc _oop;
39
40 public:
41 FakeOop() : _oop() { _oop.set_mark(originalMark()); }
42
43 oop get_oop() { return &_oop; }
44 markOop mark() { return _oop.mark(); }
45 void set_mark(markOop m) { _oop.set_mark(m); }
46 void forward_to(oop obj) {
47 markOop m = markOopDesc::encode_pointer_as_mark(obj);
48 _oop.set_mark(m);
49 }
50
51 static markOop originalMark() { return markOop(markOopDesc::lock_mask_in_place); }
52 static markOop changedMark() { return markOop(0x4711); }
53 };
54
55 TEST_VM(PreservedMarks, iterate_and_restore) {
56 // Need to disable biased locking to easily
57 // create oops that "must_be_preseved"
58 ScopedDisabledBiasedLocking dbl;
59
60 PreservedMarks pm;
61 FakeOop o1;
62 FakeOop o2;
63 FakeOop o3;
64 FakeOop o4;
65
66 // Make sure initial marks are correct.
67 ASSERT_EQ(o1.mark(), FakeOop::originalMark());
68 ASSERT_EQ(o2.mark(), FakeOop::originalMark());
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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 */
23
24 #include "precompiled.hpp"
25 #include "gc/shared/preservedMarks.inline.hpp"
26 #include "oops/oop.inline.hpp"
27 #include "unittest.hpp"
28
29 class ScopedDisabledBiasedLocking {
30 bool _orig;
31 public:
32 ScopedDisabledBiasedLocking() : _orig(UseBiasedLocking) { UseBiasedLocking = false; }
33 ~ScopedDisabledBiasedLocking() { UseBiasedLocking = _orig; }
34 };
35
36 // Class to create a "fake" oop with a mark that will
37 // return true for calls to must_be_preserved().
38 class FakeOop {
39 oopDesc _oop;
40
41 public:
42 FakeOop() : _oop() { _oop.set_mark_raw(originalMark()); }
43
44 oop get_oop() { return &_oop; }
45 markOop mark() { return _oop.mark_raw(); }
46 void set_mark(markOop m) { _oop.set_mark_raw(m); }
47 void forward_to(oop obj) {
48 markOop m = markOopDesc::encode_pointer_as_mark(obj);
49 _oop.set_mark_raw(m);
50 }
51
52 static markOop originalMark() { return markOop(markOopDesc::lock_mask_in_place); }
53 static markOop changedMark() { return markOop(0x4711); }
54 };
55
56 TEST_VM(PreservedMarks, iterate_and_restore) {
57 // Need to disable biased locking to easily
58 // create oops that "must_be_preseved"
59 ScopedDisabledBiasedLocking dbl;
60
61 PreservedMarks pm;
62 FakeOop o1;
63 FakeOop o2;
64 FakeOop o3;
65 FakeOop o4;
66
67 // Make sure initial marks are correct.
68 ASSERT_EQ(o1.mark(), FakeOop::originalMark());
69 ASSERT_EQ(o2.mark(), FakeOop::originalMark());
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