/*

 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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 TestLoopMiningArguments

 * @summary Test that loop mining arguments are sane

 * @key gc

 * @requires vm.gc.Shenandoah

 * @library /test/lib

 * @run driver TestLoopMiningArguments

 */

import java.util.*;

import jdk.test.lib.Asserts;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

public class TestLoopMiningArguments {

    public static void testWith(String msg, boolean cls, int iters, String... args) throws Exception {

        String[] cmds = Arrays.copyOf(args, args.length + 2);

        cmds[args.length] = "-XX:+PrintFlagsFinal";

        cmds[args.length + 1] = "-version";

        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(cmds);

        OutputAnalyzer output = new OutputAnalyzer(pb.start());

        output.shouldHaveExitValue(0);

        output.shouldContain("UseCountedLoopSafepoints");

        output.shouldContain("LoopStripMiningIter");

        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 {

        testDefaultGC();

        testShenandoah();

    }

    public static void testDefaultGC() throws Exception {

        testWith("Default GC should have CLS enabled, LSM = 1000",

                true, 1000);

        testWith("Default GC with +CLS should set LSM = 1",

                true, 1,

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Default GC with +CLS should not override LSM>1",

                true, 10,

                "-XX:LoopStripMiningIter=10",

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Default GC with +CLS should not override LSM=1",

                true, 1,

                "-XX:LoopStripMiningIter=1",

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Default GC with +CLS should override LSM=0 to 1",

                true, 1,

                "-XX:LoopStripMiningIter=0",

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Default GC with -CLS should set LSM = 0",

                false, 0,

                "-XX:-UseCountedLoopSafepoints"

        );

        testWith("Default GC with -CLS should override LSM to 0",

                false, 0,

                "-XX:LoopStripMiningIter=10",

                "-XX:-UseCountedLoopSafepoints"

        );

    }

    public static void testShenandoah() throws Exception {

        testWith("Shenandoah should have CLS and LSM enabled",

                true, 1000,

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC"

        );

        testWith("Shenandoah with +CLS should set LSM = 1",

                true, 1,

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC",

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Shenandoah GC with +CLS should not override LSM>1",

                true, 10,

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC",

                "-XX:LoopStripMiningIter=10",

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Shenandoah GC with +CLS should not override LSM=1",

                true, 1,

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC",

                "-XX:LoopStripMiningIter=1",

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Shenandoah GC with +CLS should override LSM=0 to 1",

                true, 1,

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC",

                "-XX:LoopStripMiningIter=0",

                "-XX:+UseCountedLoopSafepoints"

        );

        testWith("Shenandoah GC with -CLS should set LSM = 0",

                false, 0,

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC",

                "-XX:-UseCountedLoopSafepoints"

        );

        testWith("Shenandoah GC with -CLS should override LSM to 0",

                false, 0,

                "-XX:+UnlockExperimentalVMOptions",

                "-XX:+UseShenandoahGC",

                "-XX:LoopStripMiningIter=10",

                "-XX:-UseCountedLoopSafepoints"

        );

    }

}