1 /* 2 * Copyright (c) 2009 SAP SE. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * @test 26 * @bug 6880034 27 * @summary SIGBUS during deoptimisation at a safepoint on 64bit-SPARC 28 * 29 * @run main/othervm -Xcomp -Xbatch 30 * -XX:+PrintCompilation 31 * -XX:CompileCommand=compileonly,compiler.c2.Test6880034::deopt_compiledframe_at_safepoint 32 * compiler.c2.Test6880034 33 */ 34 35 package compiler.c2; 36 37 // This test provokes a deoptimisation at a safepoint. 38 // 39 // It achieves this by compiling the method 'deopt_compiledframe_at_safepoint' 40 // before its first usage at a point in time when a call to the virtual method 41 // A::doSomething() from within 'deopt_compiledframe_at_safepoint' can be 42 // optimised to a static call because class A has no descendants. 43 // 44 // Later, when deopt_compiledframe_at_safepoint() is running, class B which 45 // extends A and overrides the virtual method "doSomething()", is loaded 46 // asynchronously in another thread. This makes the compiled code of 47 // 'deopt_compiledframe_at_safepoint' invalid and triggers a deoptimisation of 48 // the frame where 'deopt_compiledframe_at_safepoint' is running in a 49 // loop. 50 // 51 // The deoptimisation leads to a SIGBUS on 64-bit server VMs on SPARC and to 52 // an incorrect result on 32-bit server VMs on SPARC due to a regression 53 // introduced by the change: "6420645: Create a vm that uses compressed oops 54 // for up to 32gb heapsizes" 55 // (http://hg.openjdk.java.net/jdk7/jdk7/hotspot/rev/ba764ed4b6f2). Further 56 // investigation showed that change 6420645 is not really the root cause of 57 // this error but only reveals a problem with the float register encodings in 58 // sparc.ad which was hidden until now. 59 // 60 // Notice that for this test to fail in jtreg it is crucial that 61 // deopt_compiledframe_at_safepoint() runs in the main thread. Otherwise a 62 // crash in deopt_compiledframe_at_safepoint() will not be detected as a test 63 // failure by jtreg. 64 // 65 // Author: Volker H. Simonis 66 67 public class Test6880034 { 68 static class A { doSomething()69 public int doSomething() { 70 return 0; 71 } 72 } 73 74 static class B extends A { B()75 public B() {} 76 // override 'A::doSomething()' doSomething()77 public int doSomething() { 78 return 1; 79 } 80 } 81 82 static class G { 83 public static volatile A a = new A(); 84 85 // Change 'a' to point to a 'B' object setAtoB()86 public static void setAtoB() { 87 try { 88 a = (A) ClassLoader. 89 getSystemClassLoader(). 90 loadClass("B"). 91 getConstructor(new Class[] {}). 92 newInstance(new Object[] {}); 93 } 94 catch (Exception e) { 95 System.out.println(e); 96 } 97 } 98 } 99 100 public static volatile boolean is_in_loop = false; 101 public static volatile boolean stop_while_loop = false; 102 deopt_compiledframe_at_safepoint()103 public static double deopt_compiledframe_at_safepoint() { 104 // This will be an optimised static call to A::doSomething() until we load "B" 105 int i = G.a.doSomething(); 106 107 // Need more than 16 'double' locals in this frame 108 double local1 = 1; 109 double local2 = 2; 110 double local3 = 3; 111 double local4 = 4; 112 double local5 = 5; 113 double local6 = 6; 114 double local7 = 7; 115 double local8 = 8; 116 117 long k = 0; 118 // Once we load "B", this method will be made 'not entrant' and deoptimised 119 // at the safepoint which is at the end of this loop. 120 while (!stop_while_loop) { 121 if (k == 1) local1 += i; 122 if (k == 2) local2 += i; 123 if (k == 3) local3 += i; 124 if (k == 4) local4 += i; 125 if (k == 5) local5 += i; 126 if (k == 6) local6 += i; 127 if (k == 7) local7 += i; 128 if (k == 8) local8 += i; 129 130 // Tell the world that we're now running wild in the loop 131 if (k++ == 20000) is_in_loop = true; 132 } 133 134 return 135 local1 + local2 + local3 + local4 + 136 local5 + local6 + local7 + local8 + i; 137 } 138 main(String[] args)139 public static void main(String[] args) { 140 141 // Just to resolve G before we compile deopt_compiledframe_at_safepoint() 142 G g = new G(); 143 144 // Asynchronous thread which will eventually invalidate the code for 145 // deopt_compiledframe_at_safepoint() and therefore triggering a 146 // deoptimisation of that method. 147 new Thread() { 148 public void run() { 149 while (!is_in_loop) { 150 // Wait until the loop is running 151 } 152 // Load class 'B' asynchronously.. 153 G.setAtoB(); 154 // ..and stop the loop 155 stop_while_loop = true; 156 } 157 }.start(); 158 159 // Run the loop in deopt_compiledframe_at_safepoint() 160 double retVal = deopt_compiledframe_at_safepoint(); 161 162 System.out.println(retVal == 36 ? "OK" : "ERROR : " + retVal); 163 if (retVal != 36) throw new RuntimeException(); 164 } 165 } 166