Mercurial > hg > graal-jvmci-8
diff test/compiler/loopopts/UseCountedLoopSafepoints.java @ 23473:cf93dd06db0f
6869327: Add new C2 flag to keep safepoints in counted loops.
Reviewed-by: kvn
author | aeriksso |
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date | Fri, 04 Dec 2015 14:06:38 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/compiler/loopopts/UseCountedLoopSafepoints.java Fri Dec 04 14:06:38 2015 +0100 @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2015, Oracle and/or its affiliates. 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 6869327 + * @summary Test that C2 flag UseCountedLoopSafepoints ensures a safepoint is kept in a CountedLoop + * @library /testlibrary + * @run main UseCountedLoopSafepoints + */ + +import java.util.concurrent.atomic.AtomicLong; +import com.oracle.java.testlibrary.ProcessTools; +import com.oracle.java.testlibrary.OutputAnalyzer; + +public class UseCountedLoopSafepoints { + private static final AtomicLong _num = new AtomicLong(0); + + // Uses the fact that an EnableBiasedLocking vmop will be started + // after 500ms, while we are still in the loop. If there is a + // safepoint in the counted loop, then we will reach safepoint + // very quickly. Otherwise SafepointTimeout will be hit. + public static void main (String args[]) throws Exception { + if (args.length == 1) { + final int loops = Integer.parseInt(args[0]); + for (int i = 0; i < loops; i++) { + _num.addAndGet(1); + } + } else { + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( + "-XX:+IgnoreUnrecognizedVMOptions", + "-XX:-TieredCompilation", + "-XX:+UseBiasedLocking", + "-XX:BiasedLockingStartupDelay=500", + "-XX:+SafepointTimeout", + "-XX:SafepointTimeoutDelay=2000", + "-XX:+UseCountedLoopSafepoints", + "UseCountedLoopSafepoints", + "2000000000" + ); + OutputAnalyzer output = new OutputAnalyzer(pb.start()); + output.shouldNotContain("Timeout detected"); + output.shouldHaveExitValue(0); + } + } +}