jdk-24/test/hotspot/jtreg/compiler/loopstripmining/TestNoWarningLoopStripMiningIterSet.java

/*
 * Copyright (c) 2020, Red Hat, Inc. 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
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 * questions.
 */

/*
 * @test id=G1
 * @bug 8241486
 * @summary G1/Z give warning when using LoopStripMiningIter and turn off LoopStripMiningIter (0)
 * @requires vm.flagless
 * @requires vm.flavor == "server" & !vm.graal.enabled
 * @requires vm.gc.G1
 * @library /test/lib
 * @run driver TestNoWarningLoopStripMiningIterSet G1
 */

/*
 * @test id=Shenandoah
 * @bug 8241486
 * @summary G1/Z give warning when using LoopStripMiningIter and turn off LoopStripMiningIter (0)
 * @requires vm.flagless
 * @requires vm.flavor == "server" & !vm.graal.enabled
 * @requires vm.gc.Shenandoah
 * @library /test/lib
 * @run driver TestNoWarningLoopStripMiningIterSet Shenandoah
 */

/*
 * @test id=Z
 * @bug 8241486
 * @summary G1/Z give warning when using LoopStripMiningIter and turn off LoopStripMiningIter (0)
 * @requires vm.flagless
 * @requires vm.flavor == "server" & !vm.graal.enabled
 * @requires vm.gc.Z
 * @library /test/lib
 * @run driver TestNoWarningLoopStripMiningIterSet Z
 */

/*
 * @test id=Epsilon
 * @bug 8241486
 * @summary G1/Z give warning when using LoopStripMiningIter and turn off LoopStripMiningIter (0)
 * @requires vm.flagless
 * @requires vm.flavor == "server" & !vm.graal.enabled
 * @requires vm.gc.Epsilon
 * @library /test/lib
 * @run driver TestNoWarningLoopStripMiningIterSet Epsilon
 */


import jdk.test.lib.Asserts;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
import java.util.function.Consumer;
import java.util.Arrays;
import java.util.List;

public class TestNoWarningLoopStripMiningIterSet {
    static final String CLSOnLSMEqualZero = "When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1";
    static final String CLSOffLSMGreaterZero = "Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0";

    public static void testWith(Consumer<OutputAnalyzer> check, String msg, boolean cls, int iters, String... args) throws Exception {
        String[] cmds = new String[args.length + 3];
        cmds[0] = "-XX:+UnlockExperimentalVMOptions";
        System.arraycopy(args, 0, cmds, 1, args.length);
        cmds[args.length + 1] = "-XX:+PrintFlagsFinal";
        cmds[args.length + 2] = "-version";
        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(cmds);
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        output.shouldHaveExitValue(0);

        check.accept(output);

        Asserts.assertEQ(output.firstMatch("(.+?) UseCountedLoopSafepoints.+?= (.+?) (.+?)", 2), Boolean.toString(cls), msg + ", but got wrong CLS");
        Asserts.assertEQ(output.firstMatch("(.+?) LoopStripMiningIter.+?= (.+?) (.+?)", 2), String.valueOf(iters), msg + ", but got wrong LSM");
    }

    public static void main(String[] args) throws Exception {
        String gc = "-XX:+Use" + args[0] + "GC";
        testWith(output -> output.shouldNotContain(CLSOffLSMGreaterZero), "should have CLS and LSM enabled", true, 100, "-XX:LoopStripMiningIter=100", gc);
        testWith(output -> output.shouldContain(CLSOffLSMGreaterZero), "should have CLS and LSM disabled", false, 0, "-XX:-UseCountedLoopSafepoints", "-XX:LoopStripMiningIter=100", gc);
        testWith(output -> output.shouldContain(CLSOnLSMEqualZero), "should have CLS and LSM enabled", true, 1, "-XX:LoopStripMiningIter=0", gc);
        testWith(output -> output.shouldNotContain(CLSOnLSMEqualZero), "should have CLS and LSM disabled", false, 0, "-XX:-UseCountedLoopSafepoints", "-XX:LoopStripMiningIter=0", gc);
    }
}