Mercurial > hg > graal-compiler
annotate test/compiler/6880034/Test6880034.java @ 3095:d3d00c1ea071
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author | Peter Hofer <peter.hofer@jku.at> |
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date | Wed, 29 Jun 2011 17:33:35 +0200 |
parents | c18cbe5936b8 |
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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 * |
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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 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 } |