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/*

 * @test TestVerifyBeforeAndAfterGCFlags

 * @key gc

 * @bug 8000831

 * @summary Runs an simple application (GarbageProducer) with various

         combinations of -XX:{+|-}Verify{After|Before}GC flags and checks that

         output contain or doesn't contain expected patterns

 * @modules java.base/jdk.internal.misc

 * @modules java.management

 * @library /test/lib

 * @run driver TestVerifyBeforeAndAfterGCFlags

 */

import java.util.ArrayList;

import java.util.Collections;

import jdk.test.lib.Utils;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

public class TestVerifyBeforeAndAfterGCFlags {

    // VerifyBeforeGC:[Verifying threads heap tenured eden syms strs zone dict metaspace chunks hand code cache ]

    public static final String VERIFY_BEFORE_GC_PATTERN = "Verifying Before GC";

    // VerifyBeforeGC: VerifyBeforeGC: VerifyBeforeGC:

    public static final String VERIFY_BEFORE_GC_CORRUPTED_PATTERN = "VerifyBeforeGC:(?!\\[Verifying[^]]+\\])";

    // VerifyAfterGC:[Verifying threads heap tenured eden syms strs zone dict metaspace chunks hand code cache ]

    public static final String VERIFY_AFTER_GC_PATTERN = "Verifying After GC";

    // VerifyAfterGC: VerifyAfterGC: VerifyAfterGC:

    public static final String VERIFY_AFTER_GC_CORRUPTED_PATTERN = "VerifyAfterGC:(?!\\[Verifying[^]]+\\])";

    public static void main(String args[]) throws Exception {

        String[] filteredOpts = Utils.getFilteredTestJavaOpts(

                                    new String[] { "-Xlog:gc+verify=debug",

                                                   "-XX:+UseGCLogFileRotation",

                                                   "-XX:-DisplayVMOutput",

                                                   "VerifyBeforeGC",

                                                   "VerifyAfterGC" });

        testVerifyFlags(false, false, filteredOpts);

        testVerifyFlags(true,  true,  filteredOpts);

        testVerifyFlags(true,  false, filteredOpts);

        testVerifyFlags(false, true,  filteredOpts);

    }

    public static void testVerifyFlags(boolean verifyBeforeGC,

                                       boolean verifyAfterGC,

                                       String[] opts) throws Exception {

        ArrayList<String> vmOpts = new ArrayList<>();

        if (opts != null && (opts.length > 0)) {

            Collections.addAll(vmOpts, opts);

        }

        Collections.addAll(vmOpts, new String[] {

                                       "-Xlog:gc+verify=debug",

                                       "-Xmx5m",

                                       "-Xms5m",

                                       "-Xmn3m",

                                       "-XX:+UnlockDiagnosticVMOptions",

                                       (verifyBeforeGC ? "-XX:+VerifyBeforeGC"

                                                       : "-XX:-VerifyBeforeGC"),

                                       (verifyAfterGC ? "-XX:+VerifyAfterGC"

                                                      : "-XX:-VerifyAfterGC"),

                                       GarbageProducer.class.getName() });

        ProcessBuilder procBuilder =

            ProcessTools.createJavaProcessBuilder(vmOpts.toArray(

                                                   new String[vmOpts.size()]));

        OutputAnalyzer analyzer = new OutputAnalyzer(procBuilder.start());

        analyzer.shouldHaveExitValue(0);

        analyzer.shouldNotMatch(VERIFY_BEFORE_GC_CORRUPTED_PATTERN);

        analyzer.shouldNotMatch(VERIFY_AFTER_GC_CORRUPTED_PATTERN);

        if (verifyBeforeGC) {

            analyzer.shouldMatch(VERIFY_BEFORE_GC_PATTERN);

        } else {

            analyzer.shouldNotMatch(VERIFY_BEFORE_GC_PATTERN);

        }

        if (verifyAfterGC) {

            analyzer.shouldMatch(VERIFY_AFTER_GC_PATTERN);

        } else {

            analyzer.shouldNotMatch(VERIFY_AFTER_GC_PATTERN);

        }

    }

    public static class GarbageProducer {

        static long[][] garbage = new long[10][];

        public static void main(String args[]) {

            int j = 0;

            for(int i = 0; i<1000; i++) {

                garbage[j] = new long[10000];

                j = (j+1)%garbage.length;

            }

        }

    }

}