/*

 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import sun.jvm.hotspot.HotSpotAgent;

import sun.jvm.hotspot.utilities.SystemDictionaryHelper;

import sun.jvm.hotspot.oops.InstanceKlass;

import sun.jvm.hotspot.debugger.*;

import jdk.test.lib.JDKToolLauncher;

import jdk.test.lib.JDKToolFinder;

import jdk.test.lib.Platform;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.Utils;

import jdk.test.lib.Asserts;

/*

 * @test

 * @library /test/lib

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

 * @compile -XDignore.symbol.file=true

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot=ALL-UNNAMED

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot.utilities=ALL-UNNAMED

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot.oops=ALL-UNNAMED

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot.debugger=ALL-UNNAMED

 *          TestInstanceKlassSizeForInterface.java

 * @run main/othervm

 *          --add-modules=jdk.hotspot.agent

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot=ALL-UNNAMED

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot.utilities=ALL-UNNAMED

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot.oops=ALL-UNNAMED

 *          --add-exports=jdk.hotspot.agent/sun.jvm.hotspot.debugger=ALL-UNNAMED

 *          TestInstanceKlassSizeForInterface

 */

interface Language {

    static final long nbrOfWords = 99999;

    public abstract long getNbrOfWords();

}

class ParselTongue implements Language {

    public long getNbrOfWords() {

      return nbrOfWords * 4;

    }

}

public class TestInstanceKlassSizeForInterface {

    private static void SAInstanceKlassSize(int pid,

                                            String[] instanceKlassNames) {

        HotSpotAgent agent = new HotSpotAgent();

        try {

            agent.attach((int)pid);

        }

        catch (DebuggerException e) {

            System.out.println(e.getMessage());

            System.err.println("Unable to connect to process ID: " + pid);

            agent.detach();

            e.printStackTrace();

        }

        for (String instanceKlassName : instanceKlassNames) {

            InstanceKlass iKlass = SystemDictionaryHelper.findInstanceKlass(

                                       instanceKlassName);

            Asserts.assertNotNull(iKlass,

                String.format("Unable to find instance klass for %s", instanceKlassName));

            System.out.println("SA: The size of " + instanceKlassName +

                               " is " + iKlass.getSize());

        }

        agent.detach();

    }

    private static String getJcmdInstanceKlassSize(OutputAnalyzer output,

                                                   String instanceKlassName) {

        for (String s : output.asLines()) {

            if (s.contains(instanceKlassName)) {

                String tokens[];

                System.out.println(s);

                tokens = s.split("\\s+");

                return tokens[3];

            }

        }

        return null;

    }

    private static void createAnotherToAttach(

                            String[] instanceKlassNames) throws Exception {

        ProcessBuilder pb = new ProcessBuilder();

        // Grab the pid from the current java process and pass it

        String[] toolArgs = {

            "--add-modules=jdk.hotspot.agent",

            "--add-exports=jdk.hotspot.agent/sun.jvm.hotspot=ALL-UNNAMED",

            "--add-exports=jdk.hotspot.agent/sun.jvm.hotspot.utilities=ALL-UNNAMED",

            "--add-exports=jdk.hotspot.agent/sun.jvm.hotspot.oops=ALL-UNNAMED",

            "--add-exports=jdk.hotspot.agent/sun.jvm.hotspot.debugger=ALL-UNNAMED",

            "TestInstanceKlassSizeForInterface",

            Long.toString(ProcessTools.getProcessId())

        };

        pb.command(new String[] {

                          JDKToolFinder.getJDKTool("jcmd"),

                          Long.toString(ProcessTools.getProcessId()),

                          "GC.class_stats",

                          "VTab,ITab,OopMap,KlassBytes"

                      }

                  );

        // Start a new process to attach to the current process

        ProcessBuilder processBuilder = ProcessTools

                  .createJavaProcessBuilder(toolArgs);

        OutputAnalyzer SAOutput = ProcessTools.executeProcess(processBuilder);

        System.out.println(SAOutput.getOutput());

        OutputAnalyzer jcmdOutput = new OutputAnalyzer(pb.start());

        System.out.println(jcmdOutput.getOutput());

        // Match the sizes from both the output streams

        for (String instanceKlassName : instanceKlassNames) {

            System.out.println ("Trying to match for " + instanceKlassName);

            String jcmdInstanceKlassSize = getJcmdInstanceKlassSize(

                                                      jcmdOutput,

                                                      instanceKlassName);

            Asserts.assertNotNull(jcmdInstanceKlassSize,

                "Could not get the instance klass size from the jcmd output");

            for (String s : SAOutput.asLines()) {

                if (s.contains(instanceKlassName)) {

                   Asserts.assertTrue(

                      s.contains(jcmdInstanceKlassSize),

                      "The size computed by SA for " +

                      instanceKlassName + " does not match.");

                }

            }

        }

    }

    public static void main (String... args) throws Exception {

        String[] instanceKlassNames = new String[] {

                                          "Language",

                                          "ParselTongue",

                                          "TestInstanceKlassSizeForInterface$1"

                                      };

        if (!Platform.shouldSAAttach()) {

            System.out.println(

               "SA attach not expected to work - test skipped.");

            return;

        }

        if (args == null || args.length == 0) {

            ParselTongue lang = new ParselTongue();

            Language ventro = new Language() {

                public long getNbrOfWords() {

                    return nbrOfWords * 8;

                }

            };

            // Not tested at this point. The test needs to be enhanced

            // later to test for the sizes of the Lambda MetaFactory

            // generated anonymous classes too. (After JDK-8160228 gets

            // fixed.)

            Runnable r2 = () -> System.out.println("Hello world!");

            r2.run();

            createAnotherToAttach(instanceKlassNames);

        } else {

            SAInstanceKlassSize(Integer.parseInt(args[0]), instanceKlassNames);

        }

    }

}