test/hotspot/jtreg/gc/shenandoah/options/TestLoopMiningArguments.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test TestLoopMiningArguments
 * @summary Test that loop mining arguments are sane
 * @requires vm.gc.Shenandoah & !vm.graal.enabled
 * @requires vm.flavor == "server"
 * @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 + 3);
        cmds[args.length] = "-Xmx128m";
        cmds[args.length + 1] = "-XX:+PrintFlagsFinal";
        cmds[args.length + 2] = "-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 {
        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"
        );
    }

}