| /* |
| * 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. |
| * |
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| * 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). |
| * |
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| * |
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| */ |
| |
| /** |
| * @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(); |
| } |
| } |