1 /*
 2  * Copyright (c) 2022, 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 "memory/allocation.hpp"
26 #include "utilities/objectBitSet.inline.hpp"
27 #include "unittest.hpp"
28 
29 TEST_VM(ObjectBitSet, empty) {
30   ObjectBitSet<mtTracing> obs;
31   oopDesc obj1;
32   ASSERT_FALSE(obs.is_marked(&obj1));
33 }
34 
35 // NOTE: This is a little weird. NULL is not treated any special: ObjectBitSet will happily
36 // allocate a fragement for the memory range starting at 0 and mark the first bit when passing NULL.
37 // In the absense of any error handling, I am not sure what would possibly be a reasonable better
38 // way to do it, though.
39 TEST_VM(ObjectBitSet, null) {
40   ObjectBitSet<mtTracing> obs;
41   ASSERT_FALSE(obs.is_marked((oop)NULL));
42   obs.mark_obj((oop) NULL);
43   ASSERT_TRUE(obs.is_marked((oop)NULL));
44 }
45 
46 TEST_VM(ObjectBitSet, mark_single) {
47   ObjectBitSet<mtTracing> obs;
48   oopDesc obj1;
49   ASSERT_FALSE(obs.is_marked(&obj1));
50   obs.mark_obj(&obj1);
51   ASSERT_TRUE(obs.is_marked(&obj1));
52 }
53 
54 TEST_VM(ObjectBitSet, mark_multi) {
55   ObjectBitSet<mtTracing> obs;
56   oopDesc obj1;
57   oopDesc obj2;
58   ASSERT_FALSE(obs.is_marked(&obj1));
59   ASSERT_FALSE(obs.is_marked(&obj2));
60   obs.mark_obj(&obj1);
61   ASSERT_TRUE(obs.is_marked(&obj1));
62   ASSERT_FALSE(obs.is_marked(&obj2));
63   obs.mark_obj(&obj2);
64   ASSERT_TRUE(obs.is_marked(&obj1));
65   ASSERT_TRUE(obs.is_marked(&obj2));
66 }