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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * particular file as subject to the "Classpath" exception as provided

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 * 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).

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package jdk.jfr.jvm;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.List;

import jdk.internal.misc.Unsafe;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordingFile;

import jdk.test.lib.Asserts;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

 * @test

 * @key jfr

 * @summary Verifies that data associated with a running recording can be evacuated to an hs_err_pidXXX.jfr when the VM crashes

 *

 * @library /test/lib

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

 *          java.management

 *          jdk.jfr

 *

 * @run main/othervm --add-exports=java.base/jdk.internal.misc=ALL-UNNAMED jdk.jfr.jvm.TestDumpOnCrash

 */

public class TestDumpOnCrash {

    private static final CharSequence LOG_FILE_EXTENSION = ".log";

    private static final CharSequence JFR_FILE_EXTENSION = ".jfr";

    static class Crasher {

        public static void main(String[] args) {

            Unsafe.getUnsafe().putInt(0L, 0);

        }

    }

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

        processOutput(runProcess());

    }

    private static OutputAnalyzer runProcess() throws Exception {

        return new OutputAnalyzer(

            ProcessTools.createJavaProcessBuilder(true,

                "-Xmx64m",

                "-Xint",

                "-XX:-TransmitErrorReport",

                "-XX:-CreateCoredumpOnCrash",

                "--add-exports=java.base/jdk.internal.misc=ALL-UNNAMED",

                "-XX:StartFlightRecording=dumponexit=true",

                Crasher.class.getName()).start());

    }

    private static void processOutput(OutputAnalyzer output) throws Exception {

        output.shouldContain("CreateCoredumpOnCrash turned off, no core file dumped");

        final Path jfrEmergencyFilePath = getHsErrJfrPath(output);

        Asserts.assertTrue(Files.exists(jfrEmergencyFilePath), "No emergency jfr recording file " + jfrEmergencyFilePath + " exists");

        Asserts.assertNotEquals(Files.size(jfrEmergencyFilePath), 0L, "File length 0. Should at least be some bytes");

        System.out.printf("File size=%d%n", Files.size(jfrEmergencyFilePath));

        List<RecordedEvent> events = RecordingFile.readAllEvents(jfrEmergencyFilePath);

        Asserts.assertFalse(events.isEmpty(), "No event found");

        System.out.printf("Found event %s%n", events.get(0).getEventType().getName());

    }

    private static Path getHsErrJfrPath(OutputAnalyzer output) throws Exception {

        // extract to find hs-err_pid log file location

        final String hs_err_pid_log_file = output.firstMatch("# *(\\S*hs_err_pid\\d+\\.log)", 1);

        if (hs_err_pid_log_file == null) {

            throw new RuntimeException("Did not find hs_err_pid.log file in output.\n");

        }

        // the dumped out jfr file should have the same name and location but with a .jfr extension

        final String hs_err_pid_jfr_file = hs_err_pid_log_file.replace(LOG_FILE_EXTENSION, JFR_FILE_EXTENSION);

        return Paths.get(hs_err_pid_jfr_file);

    }

}