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/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "precompiled.hpp"
#include "classfile/altHashing.hpp"
#include "unittest.hpp"
// Internal test for alternate hashing. Translated from JDK version
// test/sun/misc/Hashing.java
static const jbyte ONE_BYTE[] = {(jbyte) 0x80};
static const jbyte TWO_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81};
static const jchar ONE_CHAR[] = {(jchar) 0x8180};
static const jbyte THREE_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82};
static const jbyte FOUR_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82, (jbyte) 0x83};
static const jchar TWO_CHAR[] = {(jchar) 0x8180, (jchar) 0x8382};
static const jint ONE_INT[] = {(jint) 0x83828180};
static const jbyte SIX_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82, (jbyte) 0x83, (jbyte) 0x84, (jbyte) 0x85};
static const jchar THREE_CHAR[] = {(jchar) 0x8180, (jchar) 0x8382, (jchar) 0x8584};
static const jbyte EIGHT_BYTE[] = {
(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82,
(jbyte) 0x83, (jbyte) 0x84, (jbyte) 0x85,
(jbyte) 0x86, (jbyte) 0x87
};
static const jchar FOUR_CHAR[] = {
(jchar) 0x8180, (jchar) 0x8382,
(jchar) 0x8584, (jchar) 0x8786
};
static const jint TWO_INT[] = {(jint) 0x83828180, (jint) 0x87868584};
static const juint MURMUR3_32_X86_CHECK_VALUE = 0xB0F57EE3;
class AltHashingTest : public ::testing::Test {
public:
static juint murmur3_32(const jint* data, int len) {
return AltHashing::murmur3_32(data, len);
}
};
TEST_F(AltHashingTest, murmur3_32_byte_array_test) {
jbyte vector[256];
jbyte hashes[4 * 256];
for (int i = 0; i < 256; i++) {
vector[i] = (jbyte) i;
}
// Hash subranges {}, {0}, {0,1}, {0,1,2}, ..., {0,...,255}
for (int i = 0; i < 256; i++) {
juint hash = AltHashing::murmur3_32(256 - i, vector, i);
hashes[i * 4] = (jbyte) hash;
hashes[i * 4 + 1] = (jbyte) (hash >> 8);
hashes[i * 4 + 2] = (jbyte) (hash >> 16);
hashes[i * 4 + 3] = (jbyte) (hash >> 24);
}
// hash to get const result.
juint final_hash = AltHashing::murmur3_32(0, hashes, 4 * 256);
ASSERT_EQ(MURMUR3_32_X86_CHECK_VALUE, final_hash)
<< "Calculated hash result not as expected.";
}
TEST_F(AltHashingTest, equivalent_hashes_test) {
juint jbytes, jchars, ints;
jbytes = AltHashing::murmur3_32(0, TWO_BYTE, 2);
jchars = AltHashing::murmur3_32(0, ONE_CHAR, 1);
ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
jbytes = AltHashing::murmur3_32(0, FOUR_BYTE, 4);
jchars = AltHashing::murmur3_32(0, TWO_CHAR, 2);
ints = AltHashingTest::murmur3_32(ONE_INT, 1);
ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
ASSERT_EQ(jbytes, ints) << "Hashes did not match.";
jbytes = AltHashing::murmur3_32(0, SIX_BYTE, 6);
jchars = AltHashing::murmur3_32(0, THREE_CHAR, 3);
ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
jbytes = AltHashing::murmur3_32(0, EIGHT_BYTE, 8);
jchars = AltHashing::murmur3_32(0, FOUR_CHAR, 4);
ints = AltHashingTest::murmur3_32(TWO_INT, 2);
ASSERT_EQ(jbytes, jchars) << "Hashes did not match.";
ASSERT_EQ(jbytes, ints) << "Hashes did not match.";
}
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