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#include "precompiled.hpp"
24#include "classfile/altHashing.hpp"
25#include "unittest.hpp"
26
27// Internal test for alternate hashing. Translated from JDK version
28// test/sun/misc/Hashing.java
29static const jbyte ONE_BYTE[] = {(jbyte) 0x80};
30static const jbyte TWO_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81};
31static const jchar ONE_CHAR[] = {(jchar) 0x8180};
32static const jbyte THREE_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82};
33static const jbyte FOUR_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82, (jbyte) 0x83};
34static const jchar TWO_CHAR[] = {(jchar) 0x8180, (jchar) 0x8382};
35static const jint ONE_INT[] = {(jint) 0x83828180};
36static const jbyte SIX_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82, (jbyte) 0x83, (jbyte) 0x84, (jbyte) 0x85};
37static const jchar THREE_CHAR[] = {(jchar) 0x8180, (jchar) 0x8382, (jchar) 0x8584};
38static const jbyte EIGHT_BYTE[] = {
39 (jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82,
40 (jbyte) 0x83, (jbyte) 0x84, (jbyte) 0x85,
41 (jbyte) 0x86, (jbyte) 0x87
42};
43static const jchar FOUR_CHAR[] = {
44 (jchar) 0x8180, (jchar) 0x8382,
45 (jchar) 0x8584, (jchar) 0x8786
46};
47
48static const jint TWO_INT[] = {(jint) 0x83828180, (jint) 0x87868584};
49static const juint MURMUR3_32_X86_CHECK_VALUE = 0xB0F57EE3;
50
51class AltHashingTest : public ::testing::Test {
52 public:
53
54 static juint murmur3_32(const jint* data, int len) {
55 return AltHashing::murmur3_32(data, len);
56 }
57};
58
59TEST_F(AltHashingTest, murmur3_32_byte_array_test) {
60 jbyte vector[256];
61 jbyte hashes[4 * 256];
62
63 for (int i = 0; i < 256; i++) {
64 vector[i] = (jbyte) i;
65 }
66
67 // Hash subranges {}, {0}, {0,1}, {0,1,2}, ..., {0,...,255}
68 for (int i = 0; i < 256; i++) {
69 juint hash = AltHashing::murmur3_32(256 - i, vector, i);
70 hashes[i * 4] = (jbyte) hash;
71 hashes[i * 4 + 1] = (jbyte) (hash >> 8);
72 hashes[i * 4 + 2] = (jbyte) (hash >> 16);
73 hashes[i * 4 + 3] = (jbyte) (hash >> 24);
74 }
75
76 // hash to get const result.
77 juint final_hash = AltHashing::murmur3_32(0, hashes, 4 * 256);
78
79 ASSERT_EQ(MURMUR3_32_X86_CHECK_VALUE, final_hash)
80 << "Calculated hash result not as expected.";
81}
82
83TEST_F(AltHashingTest, equivalent_hashes_test) {
84 juint jbytes, jchars, ints;
85
86 jbytes = AltHashing::murmur3_32(0, TWO_BYTE, 2);
87 jchars = AltHashing::murmur3_32(0, ONE_CHAR, 1);
88 ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
89
90 jbytes = AltHashing::murmur3_32(0, FOUR_BYTE, 4);
91 jchars = AltHashing::murmur3_32(0, TWO_CHAR, 2);
92 ints = AltHashingTest::murmur3_32(ONE_INT, 1);
93
94 ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
95 ASSERT_EQ(jbytes, ints) << "Hashes did not match.";
96
97 jbytes = AltHashing::murmur3_32(0, SIX_BYTE, 6);
98 jchars = AltHashing::murmur3_32(0, THREE_CHAR, 3);
99 ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
100
101 jbytes = AltHashing::murmur3_32(0, EIGHT_BYTE, 8);
102 jchars = AltHashing::murmur3_32(0, FOUR_CHAR, 4);
103 ints = AltHashingTest::murmur3_32(TWO_INT, 2);
104
105 ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
106 ASSERT_EQ(jbytes, ints) << "Hashes did not match.";
107}
108