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annotate test/compiler/6880034/Test6880034.java @ 1314:3f0549ed0c98

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6921710: G1: assert(new_finger >= _finger && new_finger < _region_limit,"invariant") Summary: If CM task was aborted while scanning the last object of the specified region and the size of that object is equal to bitmap's granularity then the next offset would be equal or over the region limit which is exactly what the assertion states. Reviewed-by: ysr, tonyp, jmasa
author apetrusenko
date Thu, 18 Mar 2010 01:48:28 -0700
parents 1ce3281a8e93
children c18cbe5936b8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
1ce3281a8e93 6880034: SIGBUS during deoptimisation at a safepoint on 64bit-SPARC
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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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any 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 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 }