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/**

 * @test SpaceUtilizationCheck

 * @summary Check if the space utilization for shared spaces is adequate

 * @requires vm.cds

 * @library /test/lib

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

 *          java.management

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

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

 */

import jdk.test.lib.cds.CDSTestUtils;

import jdk.test.lib.process.OutputAnalyzer;

import sun.hotspot.WhiteBox;

import java.util.regex.Pattern;

import java.util.regex.Matcher;

import java.util.ArrayList;

import java.util.Hashtable;

import java.lang.Integer;

public class SpaceUtilizationCheck {

    // [1] Each region must have strictly less than

    //     WhiteBox.metaspaceReserveAlignment() bytes of unused space.

    // [2] There must be no gap between two consecutive regions.

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

        // (1) Default VM arguments

        test();

        // (2) Use the now deprecated VM arguments. They should have no effect.

        test("-XX:SharedReadWriteSize=128M",

             "-XX:SharedReadOnlySize=128M",

             "-XX:SharedMiscDataSize=128M",

             "-XX:SharedMiscCodeSize=128M");

    }

    static void test(String... extra_options) throws Exception {

        OutputAnalyzer output = CDSTestUtils.createArchive(extra_options);

        CDSTestUtils.checkDump(output);

        Pattern pattern = Pattern.compile("^(..) *space: *([0-9]+).* out of *([0-9]+) bytes .* at 0x([0-9a0-f]+)");

        WhiteBox wb = WhiteBox.getWhiteBox();

        long reserve_alignment = wb.metaspaceReserveAlignment();

        System.out.println("Metaspace::reserve_alignment() = " + reserve_alignment);

        long last_region = -1;

        Hashtable<String,String> checked = new Hashtable<>();

        for (String line : output.getStdout().split("\n")) {

            if (line.contains(" space:") && !line.contains("st space:")) {

                Matcher matcher = pattern.matcher(line);

                if (matcher.find()) {

                    String name = matcher.group(1);

                    if (name.equals("s0") || name.equals("s1")) {

                      // String regions are listed at the end and they may not be fully occupied.

                      break;

                    } else {

                      System.out.println("Checking " + name + " in : " + line);

                      checked.put(name, name);

                    }

                    long used = Long.parseLong(matcher.group(2));

                    long capacity = Long.parseLong(matcher.group(3));

                    long address = Long.parseLong(matcher.group(4), 16);

                    long unused = capacity - used;

                    if (unused < 0) {

                        throw new RuntimeException("Unused space (" + unused + ") less than 0");

                    }

                    if (unused > reserve_alignment) {

                        // [1] Check for unused space

                        throw new RuntimeException("Unused space (" + unused + ") must be smaller than Metaspace::reserve_alignment() (" +

                                                   reserve_alignment + ")");

                    }

                    if (last_region >= 0 && address != last_region) {

                        // [2] Check for no-gap

                        throw new RuntimeException("Region 0x" + address + " should have started at 0x" + Long.toString(last_region, 16));

                    }

                    last_region = address + capacity;

                }

            }

        }

        }

    }

}