/*

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

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * 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).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

/*

 * @test

 * @summary Unused metadata created during dump time should be freed from the CDS archive.

 * @requires vm.cds

 * @library /test/lib

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

 * @compile test-classes/MethodNoReturn.jasm test-classes/Hello.java

 * @run driver FreeUnusedMetadata

 */

import java.nio.file.Files;

import java.nio.file.Paths;

import jdk.test.lib.process.OutputAnalyzer;

public class FreeUnusedMetadata {

    static byte iconst_1 =  4;

    static byte pop      = 87;

    static byte[] pattern = { // This has the same sequence as in test-classes/MethodNoReturn.jasm

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        pop,

        iconst_1,

        iconst_1,

        iconst_1,

        iconst_1,

        iconst_1,

        iconst_1,

        iconst_1,

        iconst_1,

        pop,

        pop,

        pop,

        pop,

        pop,

        pop,

        pop,

        pop

    };

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

        String[] ARCHIVE_CLASSES = {"Hello", "MethodNoReturn"};

        String appJar = JarBuilder.build("FreeUnusedMetadata", ARCHIVE_CLASSES);

        OutputAnalyzer dumpOutput = TestCommon.dump(

                appJar, ARCHIVE_CLASSES);

        TestCommon.checkDump(dumpOutput, "Loading classes to share");

        OutputAnalyzer execOutput = TestCommon.exec(appJar, "Hello");

        TestCommon.checkExec(execOutput, "Hello World");

        String archive = TestCommon.getCurrentArchiveName();

        System.out.println("Checking for pattern inside " + archive + "...");

        byte[] data = Files.readAllBytes(Paths.get(archive));

        int max = data.length - pattern.length;

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

            if (data[i+0] == iconst_1 && data[i+1] == pop &&

                data[i+2] == iconst_1 && data[i+3] == pop) {

                boolean match = true;

                for (int x=4; x<pattern.length; x++) {

                    if (data[i+x] != pattern[x]) {

                        match = false;

                        break;

                    }

                }

                if (match) {

                    throw new RuntimeException("method of unverifiable class should have been " +

                        "removed from the archive " + archive +

                        " , but was found at offset " + i);

                }

            }

        }

        System.out.println("Not found: method from unverifiable class has been removed");

    }

}