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annotate test/compiler/7088419/CRCTest.java @ 20218:828056cf311f

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8040792: G1: Memory usage calculation uses sizeof(this) instead of sizeof(classname) Summary: A few locations in the code use sizeof(this) which returns the size of the pointer instead of sizeof(classname) which returns the size of the sum of its members. This change fixes these errors and adds a few tests. Reviewed-by: mgerdin, brutisso
author tschatzl
date Mon, 21 Jul 2014 09:40:19 +0200
parents b800986664f4
children
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11080
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 @test
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26 @bug 7088419
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27 @run main CRCTest
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28 @summary Use x86 Hardware CRC32 Instruction with java.util.zip.CRC32 and java.util.zip.Adler32
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29 */
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30
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31 import java.nio.ByteBuffer;
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32 import java.util.zip.CRC32;
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33 import java.util.zip.Checksum;
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34
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35 public class CRCTest {
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36
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37 public static void main(String[] args) throws Exception {
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38
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39 byte[] b = initializedBytes(4096 * 4096);
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40
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41 {
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42 CRC32 crc1 = new CRC32();
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43 CRC32 crc2 = new CRC32();
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44 CRC32 crc3 = new CRC32();
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45 CRC32 crc4 = new CRC32();
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46
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47 crc1.update(b, 0, b.length);
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48 updateSerial(crc2, b, 0, b.length);
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49 updateDirect(crc3, b, 0, b.length);
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50 updateSerialSlow(crc4, b, 0, b.length);
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51
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52 check(crc1, crc2);
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53 check(crc3, crc4);
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54 check(crc1, crc3);
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55
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56 crc1.update(17);
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57 crc2.update(17);
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58 crc3.update(17);
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59 crc4.update(17);
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60
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61 crc1.update(b, 1, b.length-2);
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62 updateSerial(crc2, b, 1, b.length-2);
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63 updateDirect(crc3, b, 1, b.length-2);
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64 updateSerialSlow(crc4, b, 1, b.length-2);
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65
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66 check(crc1, crc2);
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67 check(crc3, crc4);
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68 check(crc1, crc3);
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69
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70 report("finished huge crc", crc1, crc2, crc3, crc4);
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71
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72 for (int i = 0; i < 256; i++) {
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73 for (int j = 0; j < 256; j += 1) {
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74 crc1.update(b, i, j);
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75 updateSerial(crc2, b, i, j);
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76 updateDirect(crc3, b, i, j);
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77 updateSerialSlow(crc4, b, i, j);
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78
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79 check(crc1, crc2);
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80 check(crc3, crc4);
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81 check(crc1, crc3);
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82
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83 }
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84 }
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85
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86 report("finished small survey crc", crc1, crc2, crc3, crc4);
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87 }
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88
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89 }
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90
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91 private static void report(String s, Checksum crc1, Checksum crc2,
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92 Checksum crc3, Checksum crc4) {
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93 System.out.println(s + ", crc1 = " + crc1.getValue() +
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94 ", crc2 = " + crc2.getValue()+
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95 ", crc3 = " + crc3.getValue()+
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96 ", crc4 = " + crc4.getValue());
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97 }
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98
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99 private static void check(Checksum crc1, Checksum crc2) throws Exception {
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100 if (crc1.getValue() != crc2.getValue()) {
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101 String s = "value 1 = " + crc1.getValue() + ", value 2 = " + crc2.getValue();
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102 System.err.println(s);
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103 throw new Exception(s);
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104 }
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105 }
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106
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107 private static byte[] initializedBytes(int M) {
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108 byte[] bytes = new byte[M];
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109 for (int i = 0; i < bytes.length; i++) {
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110 bytes[i] = (byte) i;
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111 }
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112 return bytes;
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113 }
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114
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115 private static void updateSerial(Checksum crc, byte[] b, int start, int length) {
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116 for (int i = 0; i < length; i++)
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117 crc.update(b[i+start]);
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118 }
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119
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120 private static void updateSerialSlow(Checksum crc, byte[] b, int start, int length) {
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121 for (int i = 0; i < length; i++)
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122 crc.update(b[i+start]);
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123 crc.getValue();
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124 }
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125
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126 private static void updateDirect(CRC32 crc3, byte[] b, int start, int length) {
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127 ByteBuffer buf = ByteBuffer.allocateDirect(length);
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128 buf.put(b, start, length);
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129 buf.flip();
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130 crc3.update(buf);
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131 }
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132 }