1/*
2 * Copyright (c) 2011, 2016, 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/g1/g1CollectedHeap.inline.hpp"
26#include "unittest.hpp"
27
28// @requires UseG1GC
29TEST_VM(FreeRegionList, length) {
30 if (!UseG1GC) {
31 return;
32 }
33
34 FreeRegionList l("test");
35 const uint num_regions_in_test = 5;
36
37 // Create a fake heap. It does not need to be valid, as the HeapRegion constructor
38 // does not access it.
39 MemRegion heap(NULL, num_regions_in_test * HeapRegion::GrainWords);
40
41 // Allocate a fake BOT because the HeapRegion constructor initializes
42 // the BOT.
43 size_t bot_size = G1BlockOffsetTable::compute_size(heap.word_size());
44 HeapWord* bot_data = NEW_C_HEAP_ARRAY(HeapWord, bot_size, mtGC);
45 ReservedSpace bot_rs(G1BlockOffsetTable::compute_size(heap.word_size()));
46 G1RegionToSpaceMapper* bot_storage =
47 G1RegionToSpaceMapper::create_mapper(bot_rs,
48 bot_rs.size(),
49 os::vm_page_size(),
50 HeapRegion::GrainBytes,
51 BOTConstants::N_bytes,
52 mtGC);
53 G1BlockOffsetTable bot(heap, bot_storage);
54 bot_storage->commit_regions(0, num_regions_in_test);
55
56 // Set up memory regions for the heap regions.
57 MemRegion mr0(heap.start(), HeapRegion::GrainWords);
58 MemRegion mr1(mr0.end(), HeapRegion::GrainWords);
59 MemRegion mr2(mr1.end(), HeapRegion::GrainWords);
60 MemRegion mr3(mr2.end(), HeapRegion::GrainWords);
61 MemRegion mr4(mr3.end(), HeapRegion::GrainWords);
62
63 HeapRegion hr0(0, &bot, mr0);
64 HeapRegion hr1(1, &bot, mr1);
65 HeapRegion hr2(2, &bot, mr2);
66 HeapRegion hr3(3, &bot, mr3);
67 HeapRegion hr4(4, &bot, mr4);
68 l.add_ordered(&hr1);
69 l.add_ordered(&hr0);
70 l.add_ordered(&hr3);
71 l.add_ordered(&hr4);
72 l.add_ordered(&hr2);
73
74 EXPECT_EQ(l.length(), num_regions_in_test) << "Wrong free region list length";
75 l.verify_list();
76
77 bot_storage->uncommit_regions(0, num_regions_in_test);
78 delete bot_storage;
79 FREE_C_HEAP_ARRAY(HeapWord, bot_data);
80}
81