jdk8-mips64-public/hotspot: test/compiler/6880034/Test6880034.java@49b5160951dd (annotated)

test/compiler/6880034/Test6880034.java@49b5160951dd (annotated)

test/compiler/6880034/Test6880034.java

Thu, 17 Apr 2014 16:09:08 -0700

author: amurillo
date: Thu, 17 Apr 2014 16:09:08 -0700
changeset 6635: 49b5160951dd
parent 1907: c18cbe5936b8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Added tag hs25.20-b11 for changeset b6a2ba7d3ea7

 /*
  * Copyright 2009 SAP AG.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 /**
  * @test
  * @bug 6880034
  * @summary SIGBUS during deoptimisation at a safepoint on 64bit-SPARC
  *
  * @run main/othervm -Xcomp -Xbatch -XX:CompileCommand=compileonly,Test6880034,deopt_compiledframe_at_safepoint -XX:+PrintCompilation Test6880034
  */
 // This test provokes a deoptimisation at a safepoint.
 //
 // It achieves this by compiling the method 'deopt_compiledframe_at_safepoint'
 // before its first usage at a point in time when a call to the virtual method
 // A::doSomething() from within 'deopt_compiledframe_at_safepoint' can be
 // optimised to a static call because class A has no descendants.
 //
 // Later, when deopt_compiledframe_at_safepoint() is running, class B which
 // extends A and overrides the virtual method "doSomething()", is loaded
 // asynchronously in another thread.  This makes the compiled code of
 // 'deopt_compiledframe_at_safepoint' invalid and triggers a deoptimisation of
 // the frame where 'deopt_compiledframe_at_safepoint' is running in a
 // loop.
 //
 // The deoptimisation leads to a SIGBUS on 64-bit server VMs on SPARC and to
 // an incorrect result on 32-bit server VMs on SPARC due to a regression
 // introduced by the change: "6420645: Create a vm that uses compressed oops
 // for up to 32gb heapsizes"
 // (http://hg.openjdk.java.net/jdk7/jdk7/hotspot/rev/ba764ed4b6f2).  Further
 // investigation showed that change 6420645 is not really the root cause of
 // this error but only reveals a problem with the float register encodings in
 // sparc.ad which was hidden until now.
 //
 // Notice that for this test to fail in jtreg it is crucial that
 // deopt_compiledframe_at_safepoint() runs in the main thread. Otherwise a
 // crash in deopt_compiledframe_at_safepoint() will not be detected as a test
 // failure by jtreg.
 //
 // Author: Volker H. Simonis
 class A {
   public int doSomething() {
     return 0;
   }
 }
 class B extends A {
   public B() {}
   // override 'A::doSomething()'
   public int doSomething() {
     return 1;
   }
 }
 class G {
   public static volatile A a = new A();
   // Change 'a' to point to a 'B' object
   public static void setAtoB() {
     try {
       a =  (A) ClassLoader.
         getSystemClassLoader().
         loadClass("B").
         getConstructor(new Class[] {}).
         newInstance(new Object[] {});
     }
     catch (Exception e) {
       System.out.println(e);
     }
   }
 }
 public class Test6880034 {
   public static volatile boolean is_in_loop = false;
   public static volatile boolean stop_while_loop = false;
   public static double deopt_compiledframe_at_safepoint() {
     // This will be an optimised static call to A::doSomething() until we load "B"
     int i = G.a.doSomething();
     // Need more than 16 'double' locals in this frame
     double local1 = 1;
     double local2 = 2;
     double local3 = 3;
     double local4 = 4;
     double local5 = 5;
     double local6 = 6;
     double local7 = 7;
     double local8 = 8;
     long k = 0;
     // Once we load "B", this method will be made 'not entrant' and deoptimised
     // at the safepoint which is at the end of this loop.
     while (!stop_while_loop) {
       if (k ==  1) local1 += i;
       if (k ==  2) local2 += i;
       if (k ==  3) local3 += i;
       if (k ==  4) local4 += i;
       if (k ==  5) local5 += i;
       if (k ==  6) local6 += i;
       if (k ==  7) local7 += i;
       if (k ==  8) local8 += i;
       // Tell the world that we're now running wild in the loop
       if (k++ == 20000) is_in_loop = true;
     }
     return
       local1 + local2 + local3 + local4 +
       local5 + local6 + local7 + local8 + i;
   }
   public static void main(String[] args) {
     // Just to resolve G before we compile deopt_compiledframe_at_safepoint()
     G g = new G();
     // Asynchronous thread which will eventually invalidate the code for
     // deopt_compiledframe_at_safepoint() and therefore triggering a
     // deoptimisation of that method.
     new Thread() {
       public void run() {
         while (!is_in_loop) {
           // Wait until the loop is running
         }
         // Load class 'B' asynchronously..
         G.setAtoB();
         // ..and stop the loop
         stop_while_loop = true;
       }
     }.start();
     // Run the loop in deopt_compiledframe_at_safepoint()
     double retVal = deopt_compiledframe_at_safepoint();
     System.out.println(retVal == 36 ? "OK" : "ERROR : " + retVal);
     if (retVal != 36) throw new RuntimeException();
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

test/compiler/6880034/Test6880034.java@49b5160951dd (annotated)

test/compiler/6880034/Test6880034.java