Mercurial > hg > truffle
comparison test/compiler/6880034/Test6880034.java @ 1007:1ce3281a8e93
6880034: SIGBUS during deoptimisation at a safepoint on 64bit-SPARC
Summary: Fix problem with the double register encodings in sparc.ad
Reviewed-by: never, jrose
Contributed-by: volker.simonis@gmail.com
author | kvn |
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date | Tue, 06 Oct 2009 10:15:38 -0700 |
parents | |
children | c18cbe5936b8 |
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1 /* | |
2 * Copyright 2009 SAP AG. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any 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 -XX:CompileCommand=compileonly,Test6880034,deopt_compiledframe_at_safepoint -XX:+PrintCompilation Test6880034 | |
30 */ | |
31 | |
32 | |
33 | |
34 // This test provokes a deoptimisation at a safepoint. | |
35 // | |
36 // It achieves this by compiling the method 'deopt_compiledframe_at_safepoint' | |
37 // before its first usage at a point in time when a call to the virtual method | |
38 // A::doSomething() from within 'deopt_compiledframe_at_safepoint' can be | |
39 // optimised to a static call because class A has no descendants. | |
40 // | |
41 // Later, when deopt_compiledframe_at_safepoint() is running, class B which | |
42 // extends A and overrides the virtual method "doSomething()", is loaded | |
43 // asynchronously in another thread. This makes the compiled code of | |
44 // 'deopt_compiledframe_at_safepoint' invalid and triggers a deoptimisation of | |
45 // the frame where 'deopt_compiledframe_at_safepoint' is running in a | |
46 // loop. | |
47 // | |
48 // The deoptimisation leads to a SIGBUS on 64-bit server VMs on SPARC and to | |
49 // an incorrect result on 32-bit server VMs on SPARC due to a regression | |
50 // introduced by the change: "6420645: Create a vm that uses compressed oops | |
51 // for up to 32gb heapsizes" | |
52 // (http://hg.openjdk.java.net/jdk7/jdk7/hotspot/rev/ba764ed4b6f2). Further | |
53 // investigation showed that change 6420645 is not really the root cause of | |
54 // this error but only reveals a problem with the float register encodings in | |
55 // sparc.ad which was hidden until now. | |
56 // | |
57 // Notice that for this test to fail in jtreg it is crucial that | |
58 // deopt_compiledframe_at_safepoint() runs in the main thread. Otherwise a | |
59 // crash in deopt_compiledframe_at_safepoint() will not be detected as a test | |
60 // failure by jtreg. | |
61 // | |
62 // Author: Volker H. Simonis | |
63 | |
64 class A { | |
65 public int doSomething() { | |
66 return 0; | |
67 } | |
68 } | |
69 | |
70 class B extends A { | |
71 public B() {} | |
72 // override 'A::doSomething()' | |
73 public int doSomething() { | |
74 return 1; | |
75 } | |
76 } | |
77 | |
78 class G { | |
79 public static volatile A a = new A(); | |
80 | |
81 // Change 'a' to point to a 'B' object | |
82 public static void setAtoB() { | |
83 try { | |
84 a = (A) ClassLoader. | |
85 getSystemClassLoader(). | |
86 loadClass("B"). | |
87 getConstructor(new Class[] {}). | |
88 newInstance(new Object[] {}); | |
89 } | |
90 catch (Exception e) { | |
91 System.out.println(e); | |
92 } | |
93 } | |
94 } | |
95 | |
96 public class Test6880034 { | |
97 | |
98 public static volatile boolean is_in_loop = false; | |
99 public static volatile boolean stop_while_loop = false; | |
100 | |
101 public static double deopt_compiledframe_at_safepoint() { | |
102 // This will be an optimised static call to A::doSomething() until we load "B" | |
103 int i = G.a.doSomething(); | |
104 | |
105 // Need more than 16 'double' locals in this frame | |
106 double local1 = 1; | |
107 double local2 = 2; | |
108 double local3 = 3; | |
109 double local4 = 4; | |
110 double local5 = 5; | |
111 double local6 = 6; | |
112 double local7 = 7; | |
113 double local8 = 8; | |
114 | |
115 long k = 0; | |
116 // Once we load "B", this method will be made 'not entrant' and deoptimised | |
117 // at the safepoint which is at the end of this loop. | |
118 while (!stop_while_loop) { | |
119 if (k == 1) local1 += i; | |
120 if (k == 2) local2 += i; | |
121 if (k == 3) local3 += i; | |
122 if (k == 4) local4 += i; | |
123 if (k == 5) local5 += i; | |
124 if (k == 6) local6 += i; | |
125 if (k == 7) local7 += i; | |
126 if (k == 8) local8 += i; | |
127 | |
128 // Tell the world that we're now running wild in the loop | |
129 if (k++ == 20000) is_in_loop = true; | |
130 } | |
131 | |
132 return | |
133 local1 + local2 + local3 + local4 + | |
134 local5 + local6 + local7 + local8 + i; | |
135 } | |
136 | |
137 public static void main(String[] args) { | |
138 | |
139 // Just to resolve G before we compile deopt_compiledframe_at_safepoint() | |
140 G g = new G(); | |
141 | |
142 // Asynchronous thread which will eventually invalidate the code for | |
143 // deopt_compiledframe_at_safepoint() and therefore triggering a | |
144 // deoptimisation of that method. | |
145 new Thread() { | |
146 public void run() { | |
147 while (!is_in_loop) { | |
148 // Wait until the loop is running | |
149 } | |
150 // Load class 'B' asynchronously.. | |
151 G.setAtoB(); | |
152 // ..and stop the loop | |
153 stop_while_loop = true; | |
154 } | |
155 }.start(); | |
156 | |
157 // Run the loop in deopt_compiledframe_at_safepoint() | |
158 double retVal = deopt_compiledframe_at_safepoint(); | |
159 | |
160 System.out.println(retVal == 36 ? "OK" : "ERROR : " + retVal); | |
161 if (retVal != 36) throw new RuntimeException(); | |
162 } | |
163 } |