1 /*
2 * Copyright (c) 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 <string.h>
26 #include <sstream>
27 #include "gc/shared/memset_with_concurrent_readers.hpp"
28 #include "utilities/debug.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/macros.hpp"
31 #include "utilities/ostream.hpp"
32 #include "unittest.hpp"
33
34 #if INCLUDE_ALL_GCS
35
36 static unsigned line_byte(const char* line, size_t i) {
37 return unsigned(line[i]) & 0xFF;
38 }
39
40 TEST(gc, memset_with_concurrent_readers) {
41 const size_t chunk_size = 8 * BytesPerWord;
42 const unsigned chunk_count = 4;
43 const size_t block_size = (chunk_count + 4) * chunk_size;
44 char block[block_size];
45 char clear_block[block_size];
46 char set_block[block_size];
47
48 // block format:
49 // 0: unused leading chunk
50 // 1: chunk written from start index to end of chunk
51 // ... nchunks fully written chunks
52 // N: chunk written from start of chunk to end index
53 // N+1: unused trailing chunk
54
55 const int clear_value = 0;
56 const int set_value = 0xAC;
57
58 memset(clear_block, clear_value, block_size);
59 memset(set_block, set_value, block_size);
60
61 for (unsigned nchunks = 0; nchunks <= chunk_count; ++nchunks) {
62 for (size_t start = 1; start <= chunk_size; ++start) {
63 for (size_t end = 0; end <= chunk_size; ++end) {
64 size_t set_start = chunk_size + start;
65 size_t set_end = (2 + nchunks) * chunk_size + end;
66 size_t set_size = set_end - set_start;
67
68 memset(block, clear_value, block_size);
69 memset_with_concurrent_readers(&block[set_start], set_value,
70 set_size);
71 bool head_clear = !memcmp(clear_block, block, set_start);
72 bool middle_set = !memcmp(set_block, block + set_start, set_size);
73 bool tail_clear = !memcmp(clear_block, block + set_end,
74 block_size - set_end);
75 std::ostringstream err_stream;
76 if (!(head_clear && middle_set && tail_clear)) {
77 err_stream << "*** memset_with_concurrent_readers failed: "
78 "set start " << set_start << ", set end " << set_end << "\n";
79 for (unsigned chunk = 0; chunk < (block_size / chunk_size);
80 ++chunk) {
81 for (unsigned line = 0; line < (chunk_size / BytesPerWord);
82 ++line) {
83
84 const char* lp
85 = &block[chunk * chunk_size + line * BytesPerWord];
86
87 err_stream << std::dec << chunk << "," << line << ": " << std::hex
88 << std::setw(2) << line_byte(lp, 0) << " "
89 << std::setw(2) << line_byte(lp, 1) << " "
90 << std::setw(2) << line_byte(lp, 2) << " "
91 << std::setw(2) << line_byte(lp, 3) << " "
92 << std::setw(2) << line_byte(lp, 4) << " "
93 << std::setw(2) << line_byte(lp, 5) << " "
94 << std::setw(2) << line_byte(lp, 6) << " "
95 << std::setw(2) << line_byte(lp, 7) << std::endl;
96 }
97 }
98 EXPECT_TRUE(head_clear) << "leading byte not clear";
99 EXPECT_TRUE(middle_set) << "memset byte not set";
100 EXPECT_TRUE(tail_clear) << "trailing bye not clear";
101 ASSERT_TRUE(head_clear && middle_set && tail_clear) << err_stream.str();
102 }
103 }
104 }
105 }
106 }
107 #endif