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annotate test/compiler/6603011/Test.java @ 6972:bd7a7ce2e264

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6830717: replay of compilations would help with debugging Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method. Reviewed-by: kvn, twisti, sspitsyn Contributed-by: yumin.qi@oracle.com
author minqi
date Mon, 12 Nov 2012 14:03:53 -0800
parents 2fe998383789
children
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1 /*
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2 * Copyright (c) 2010, 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 6603011
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27 * @summary long/int division by constant
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28 *
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29 * @run main/othervm -Xcomp -Xbatch -XX:-Inline Test
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30 */
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31
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32 //
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33 // -XX:-Inline is essential to this test so that verification functions
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34 // divi, modi, divl and modl generate "plain" divides.
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35 // -Xcomp -Xbatch are also useful to ensure the full range of
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36 // dividend and divisor combinations are tested
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37 //
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38
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39 import java.net.*;
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40
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41 class s {
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42 static int divi(int dividend, int divisor) { return dividend / divisor; }
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43 static int modi(int dividend, int divisor) { return dividend % divisor; }
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44 static long divl(long dividend, long divisor) { return dividend / divisor; }
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45 static long modl(long dividend, long divisor) { return dividend % divisor; }
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46 }
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47
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48 public class Test implements Runnable {
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49 // Report verbose messages on failure; turn off to suppress
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50 // too much output with gross numbers of failures.
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51 static final boolean VERBOSE = true;
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52
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53 // Initailize DIVISOR so that it is final in this class.
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54 static final int DIVISOR;
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55 static {
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56 int value = 0;
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57 try {
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58 value = Integer.decode(System.getProperty("divisor"));
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59 } catch (Throwable e) {
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60 }
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61 DIVISOR = value;
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62 }
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63
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64 // The methods of interest. We want the JIT to compile these
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65 // and convert the divide into a multiply.
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66 public int divbyI (int dividend) { return dividend / DIVISOR; }
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67 public int modbyI (int dividend) { return dividend % DIVISOR; }
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68 public long divbyL (long dividend) { return dividend / DIVISOR; }
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69 public long modbyL (long dividend) { return dividend % DIVISOR; }
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70
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71 public int divisor() { return DIVISOR; }
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72
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73 public boolean checkI (int dividend) {
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74 int quo = divbyI(dividend);
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75 int rem = modbyI(dividend);
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76 int quo0 = s.divi(dividend, divisor());
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77 int rem0 = s.modi(dividend, divisor());
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78
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79 if (quo != quo0 || rem != rem0) {
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80 if (VERBOSE) {
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81 System.out.println("Computed: " + dividend + " / " + divisor() + " = " +
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82 quo + ", " + dividend + " % " + divisor() + " = " + rem );
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83 System.out.println("expected: " + dividend + " / " + divisor() + " = " +
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84 quo0 + ", " + dividend + " % " + divisor() + " = " + rem0);
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85 // Report sign of rem failure
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86 if (rem != 0 && (rem ^ dividend) < 0) {
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87 System.out.println(" rem & dividend have different signs");
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88 }
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89 // Report range of rem failure
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90 if (java.lang.Math.abs(rem) >= java.lang.Math.abs(divisor())) {
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91 System.out.println(" remainder out of range");
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92 }
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93 // Report quo/rem identity relationship failure
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94 if ((quo * divisor()) + rem != dividend) {
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95 System.out.println(" quotien/remainder invariant broken");
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96 }
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97 }
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98 return false;
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99 }
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100 return true;
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101 }
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102
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103 public boolean checkL (long dividend) {
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104 long quo = divbyL(dividend);
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105 long rem = modbyL(dividend);
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106 long quo0 = s.divl(dividend, divisor());
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107 long rem0 = s.modl(dividend, divisor());
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108
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109 if (quo != quo0 || rem != rem0) {
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110 if (VERBOSE) {
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111 System.out.println("Computed: " + dividend + " / " + divisor() + " = " +
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112 quo + ", " + dividend + " % " + divisor() + " = " + rem );
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113 System.out.println("expected: " + dividend + " / " + divisor() + " = " +
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114 quo0 + ", " + dividend + " % " + divisor() + " = " + rem0);
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115 // Report sign of rem failure
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116 if (rem != 0 && (rem ^ dividend) < 0) {
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117 System.out.println(" rem & dividend have different signs");
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118 }
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119 // Report range of rem failure
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120 if (java.lang.Math.abs(rem) >= java.lang.Math.abs(divisor())) {
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121 System.out.println(" remainder out of range");
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122 }
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123 // Report quo/rem identity relationship failure
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124 if ((quo * divisor()) + rem != dividend) {
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125 System.out.println(" (" + quo + " * " + divisor() + ") + " + rem + " != "
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126 + dividend);
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127 }
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128 }
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129 return false;
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130 }
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131 return true;
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132 }
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133
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134 public void run() {
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135 // Don't try to divide by zero
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136 if (divisor() == 0) return;
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137
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138 // Range of dividends to check. Try dividends from start to end
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139 // inclusive, as well as variations on those values as shifted
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140 // left.
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141 int start = -1024;
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142 int end = 1024;
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143
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144 // Test int division using a variety of dividends.
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145 int wrong = 0;
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146 int total = 0;
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147
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148 outerloop:
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149 for (int i = start; i <= end; i++) {
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150 for (int s = 0; s < 32; s += 4) {
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151 total++;
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152 int dividend = i << s;
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153 if (!checkI(dividend)) {
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154 wrong++;
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155 // Stop on the first failure
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156 // break outerloop;
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157 }
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158 }
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159 }
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160 if (wrong > 0) {
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161 System.out.println("divisor " + divisor() + ": " +
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162 wrong + "/" + total + " wrong int divisions");
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163 }
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164
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165 // Test long division using a variety of dividends.
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166 wrong = 0;
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167 total = 0;
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168
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169 outerloop:
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170 for (int i = start; i <= end; i++) {
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171 for (int s = 0; s < 64; s += 4) {
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172 total++;
1920
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173 long dividend = ((long)i) << s;
567
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174 if (!checkL(dividend)) {
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175 wrong++;
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176 // Stop on the first failure
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177 // break outerloop;
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178 }
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179 }
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180 }
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181 if (wrong > 0) {
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182 System.out.println("divisor " + divisor() + ": " +
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183 wrong + "/" + total + " wrong long divisions");
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184 }
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185
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186 }
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187
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188 // Reload this class with the "divisor" property set to the input parameter.
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189 // This allows the JIT to see q.DIVISOR as a final constant, and change
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190 // any divisions or mod operations into multiplies.
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191 public static void test_divisor(int divisor,
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192 URLClassLoader apploader) throws Exception {
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193 System.setProperty("divisor", "" + divisor);
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194 ClassLoader loader = new URLClassLoader(apploader.getURLs(),
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195 apploader.getParent());
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196 Class c = loader.loadClass("Test");
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197 Runnable r = (Runnable)c.newInstance();
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198 r.run();
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199 }
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200
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201 public static void main(String[] args) throws Exception {
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202 Class cl = Class.forName("Test");
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203 URLClassLoader apploader = (URLClassLoader)cl.getClassLoader();
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204
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205
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206 // Test every divisor between -100 and 100.
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207 for (int i = -100; i <= 100; i++) {
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208 test_divisor(i, apploader);
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209 }
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210
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211 // Try a few divisors outside the typical range.
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212 // The values below have been observed in rt.jar.
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213 test_divisor(101, apploader);
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214 test_divisor(400, apploader);
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215 test_divisor(1000, apploader);
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216 test_divisor(3600, apploader);
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217 test_divisor(9973, apploader);
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218 test_divisor(86400, apploader);
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219 test_divisor(1000000, apploader);
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220 }
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221
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222 }