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/*

 * @test

 * @summary Use a shared string allocated in a humongous G1 region.

 * @comment -- the following implies that G1 is used (by command-line or by default)

 * @requires vm.cds.archived.java.heap

 *

 * @modules jdk.jartool/sun.tools.jar

 * @build HelloString

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:. SharedStringsHumongous

 */

import java.io.File;

import java.io.FileOutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import sun.hotspot.WhiteBox;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.Asserts;

public class SharedStringsHumongous {

    static String sharedArchiveConfigFile = System.getProperty("user.dir") + File.separator + "SharedStringsHumongous_gen.txt";

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

        WhiteBox wb = WhiteBox.getWhiteBox();

        try (FileOutputStream fos = new FileOutputStream(sharedArchiveConfigFile)) {

            PrintWriter out = new PrintWriter(new OutputStreamWriter(fos));

            out.println("VERSION: 1.0");

            out.println("@SECTION: String");

            out.println("31: shared_test_string_unique_14325");

            int region_size = wb.g1RegionSize();

            char body[] = new char[region_size + region_size / 2];

            for (int i = 0; i < body.length; i++) {

              body[i] = 'x';

            }

            Asserts.assertTrue(wb.g1IsHumongous(body));

            String prefix = "generated_string (followed by " + body.length + " 'x') ";

            System.out.println("G1 region size: " + region_size);

            System.out.println("Using a humongous string: " + prefix);

            String s = prefix + new String(body);

            out.println(s.length() + ": " + s);

            out.close();

        }

        SharedStringsUtils.run(args, SharedStringsHumongous::test);

    }

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

        String vmOptionsPrefix[] = SharedStringsUtils.getChildVMOptionsPrefix();

        String appJar = JarBuilder.build("SharedStringsHumongous", "HelloString");

        OutputAnalyzer dumpOutput = TestCommon.dump(appJar, TestCommon.list("HelloString"),

                TestCommon.concat(vmOptionsPrefix,

                    "-XX:SharedArchiveConfigFile=" + sharedArchiveConfigFile,

                    "-Xlog:gc+region+cds",

                    "-Xlog:gc+region=trace"));

        TestCommon.checkDump(dumpOutput, "extra interned string ignored; size too large");

        // Extra strings that are humongous are not kelp alive, so they should be GC'ed

        // before dumping the string table. That means the heap should contain no

        // humongous regions.

        dumpOutput.shouldNotMatch("gc,region,cds. HeapRegion 0x[0-9a-f]* HUM");

        OutputAnalyzer execOutput = TestCommon.exec(appJar,

            TestCommon.concat(vmOptionsPrefix, "HelloString"));

        TestCommon.checkExec(execOutput);

    }

}