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annotate test/compiler/6880034/Test6880034.java @ 2221:0aa3b4908911 jdk7-b131

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author cl
date Wed, 23 Feb 2011 15:48:46 -0800
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1 /*
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2 * Copyright 2009 SAP AG. 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 *
1552
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories
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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
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories
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21 * questions.
1007
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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 6880034
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27 * @summary SIGBUS during deoptimisation at a safepoint on 64bit-SPARC
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28 *
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29 * @run main/othervm -Xcomp -Xbatch -XX:CompileCommand=compileonly,Test6880034,deopt_compiledframe_at_safepoint -XX:+PrintCompilation Test6880034
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30 */
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31
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32
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33
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34 // This test provokes a deoptimisation at a safepoint.
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35 //
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36 // It achieves this by compiling the method 'deopt_compiledframe_at_safepoint'
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37 // before its first usage at a point in time when a call to the virtual method
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38 // A::doSomething() from within 'deopt_compiledframe_at_safepoint' can be
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39 // optimised to a static call because class A has no descendants.
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40 //
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41 // Later, when deopt_compiledframe_at_safepoint() is running, class B which
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42 // extends A and overrides the virtual method "doSomething()", is loaded
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43 // asynchronously in another thread. This makes the compiled code of
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44 // 'deopt_compiledframe_at_safepoint' invalid and triggers a deoptimisation of
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45 // the frame where 'deopt_compiledframe_at_safepoint' is running in a
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46 // loop.
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47 //
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48 // The deoptimisation leads to a SIGBUS on 64-bit server VMs on SPARC and to
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49 // an incorrect result on 32-bit server VMs on SPARC due to a regression
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50 // introduced by the change: "6420645: Create a vm that uses compressed oops
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51 // for up to 32gb heapsizes"
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52 // (http://hg.openjdk.java.net/jdk7/jdk7/hotspot/rev/ba764ed4b6f2). Further
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53 // investigation showed that change 6420645 is not really the root cause of
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54 // this error but only reveals a problem with the float register encodings in
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55 // sparc.ad which was hidden until now.
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56 //
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57 // Notice that for this test to fail in jtreg it is crucial that
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58 // deopt_compiledframe_at_safepoint() runs in the main thread. Otherwise a
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59 // crash in deopt_compiledframe_at_safepoint() will not be detected as a test
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60 // failure by jtreg.
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61 //
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62 // Author: Volker H. Simonis
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63
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64 class A {
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65 public int doSomething() {
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66 return 0;
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67 }
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68 }
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69
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70 class B extends A {
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71 public B() {}
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72 // override 'A::doSomething()'
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73 public int doSomething() {
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74 return 1;
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75 }
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76 }
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77
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78 class G {
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79 public static volatile A a = new A();
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80
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81 // Change 'a' to point to a 'B' object
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82 public static void setAtoB() {
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83 try {
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84 a = (A) ClassLoader.
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85 getSystemClassLoader().
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86 loadClass("B").
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87 getConstructor(new Class[] {}).
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88 newInstance(new Object[] {});
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89 }
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90 catch (Exception e) {
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91 System.out.println(e);
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92 }
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93 }
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94 }
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95
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96 public class Test6880034 {
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97
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98 public static volatile boolean is_in_loop = false;
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99 public static volatile boolean stop_while_loop = false;
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100
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101 public static double deopt_compiledframe_at_safepoint() {
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102 // This will be an optimised static call to A::doSomething() until we load "B"
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103 int i = G.a.doSomething();
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104
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105 // Need more than 16 'double' locals in this frame
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106 double local1 = 1;
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107 double local2 = 2;
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108 double local3 = 3;
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109 double local4 = 4;
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110 double local5 = 5;
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111 double local6 = 6;
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112 double local7 = 7;
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113 double local8 = 8;
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114
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115 long k = 0;
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116 // Once we load "B", this method will be made 'not entrant' and deoptimised
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117 // at the safepoint which is at the end of this loop.
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118 while (!stop_while_loop) {
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119 if (k == 1) local1 += i;
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120 if (k == 2) local2 += i;
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121 if (k == 3) local3 += i;
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122 if (k == 4) local4 += i;
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123 if (k == 5) local5 += i;
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124 if (k == 6) local6 += i;
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125 if (k == 7) local7 += i;
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126 if (k == 8) local8 += i;
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127
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128 // Tell the world that we're now running wild in the loop
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129 if (k++ == 20000) is_in_loop = true;
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130 }
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131
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132 return
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133 local1 + local2 + local3 + local4 +
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134 local5 + local6 + local7 + local8 + i;
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135 }
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136
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137 public static void main(String[] args) {
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138
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139 // Just to resolve G before we compile deopt_compiledframe_at_safepoint()
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140 G g = new G();
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141
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142 // Asynchronous thread which will eventually invalidate the code for
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143 // deopt_compiledframe_at_safepoint() and therefore triggering a
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144 // deoptimisation of that method.
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145 new Thread() {
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146 public void run() {
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147 while (!is_in_loop) {
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148 // Wait until the loop is running
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149 }
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150 // Load class 'B' asynchronously..
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151 G.setAtoB();
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152 // ..and stop the loop
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153 stop_while_loop = true;
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154 }
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155 }.start();
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156
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157 // Run the loop in deopt_compiledframe_at_safepoint()
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158 double retVal = deopt_compiledframe_at_safepoint();
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159
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160 System.out.println(retVal == 36 ? "OK" : "ERROR : " + retVal);
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161 if (retVal != 36) throw new RuntimeException();
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162 }
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163 }