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 29 static const jbyte ONE_BYTE[] = {(jbyte) 0x80}; 30 static const jbyte TWO_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81}; 31 static const jchar ONE_CHAR[] = {(jchar) 0x8180}; 32 static const jbyte THREE_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82}; 33 static const jbyte FOUR_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82, (jbyte) 0x83}; 34 static const jchar TWO_CHAR[] = {(jchar) 0x8180, (jchar) 0x8382}; 35 static const jint ONE_INT[] = {(jint) 0x83828180}; 36 static const jbyte SIX_BYTE[] = {(jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82, (jbyte) 0x83, (jbyte) 0x84, (jbyte) 0x85}; 37 static const jchar THREE_CHAR[] = {(jchar) 0x8180, (jchar) 0x8382, (jchar) 0x8584}; 38 static const jbyte EIGHT_BYTE[] = { 39 (jbyte) 0x80, (jbyte) 0x81, (jbyte) 0x82, 40 (jbyte) 0x83, (jbyte) 0x84, (jbyte) 0x85, 41 (jbyte) 0x86, (jbyte) 0x87 42 }; 43 static const jchar FOUR_CHAR[] = { 44 (jchar) 0x8180, (jchar) 0x8382, 45 (jchar) 0x8584, (jchar) 0x8786 46 }; 47 48 static const jint TWO_INT[] = {(jint) 0x83828180, (jint) 0x87868584}; 49 static const juint MURMUR3_32_X86_CHECK_VALUE = 0xB0F57EE3; 50 51 class AltHashingTest : public ::testing::Test { 52 public: 53 54 static juint murmur3_32(const int* data, int len) { 55 return AltHashing::murmur3_32(data, len); 56 } 57 }; 58 59 TEST_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 83 TEST_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 }