/*

 * 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.debugger.*;

import java.util.ArrayList;

import java.util.List;

import java.util.stream.Collectors;

import jdk.test.lib.JDKToolLauncher;

import jdk.test.lib.Platform;

import jdk.test.lib.ProcessTools;

import jdk.test.lib.OutputAnalyzer;

import jdk.test.lib.Utils;

import jdk.test.lib.apps.LingeredApp;

import jdk.test.lib.Asserts;

import java.io.*;

import java.util.*;

/*

 * @test

 * @library /test/lib/share/classes

 * @library /testlibrary

 * @build jdk.test.lib.*

 * @build jdk.test.lib.apps.*

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

 * @modules jdk.hotspot.agent

 * @modules jdk.hotspot.agent/sun.jvm.hotspot

 * @modules jdk.hotspot.agent/sun.jvm.hotspot.utilities

 * @modules jdk.hotspot.agent/sun.jvm.hotspot.oops

 * @compile -XDignore.symbol.file=true -Xmodule:jdk.hotspot.agent TestInstanceKlassSize.java

 * @run main/othervm  TestInstanceKlassSize

 */

public class TestInstanceKlassSize {

    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 OutputAnalyzer jcmd(Long pid,

                                       String... toolArgs) throws Exception {

        ProcessBuilder processBuilder = new ProcessBuilder();

        JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jcmd");

        launcher.addToolArg(Long.toString(pid));

        if (toolArgs != null) {

            for (String toolArg : toolArgs) {

                launcher.addToolArg(toolArg);

            }

        }

        processBuilder.command(launcher.getCommand());

        System.out.println(

            processBuilder.command().stream().collect(Collectors.joining(" ")));

        return ProcessTools.executeProcess(processBuilder);

    }

    private static void startMeWithArgs() throws Exception {

        LingeredApp app = null;

        OutputAnalyzer output = null;

        try {

            List<String> vmArgs = new ArrayList<String>();

            vmArgs.add("-XX:+UnlockDiagnosticVMOptions");

            vmArgs.add("-XX:+UsePerfData");

            vmArgs.addAll(Utils.getVmOptions());

            app = LingeredApp.startApp(vmArgs);

            System.out.println ("Started LingeredApp with pid " + app.getPid());

        } catch (Exception ex) {

            ex.printStackTrace();

            throw new RuntimeException(ex);

        }

        try {

            String[] instanceKlassNames = new String[] {

                                              " java.lang.Object",

                                              " java.util.Vector",

                                              " sun.util.PreHashedMap",

                                              " java.lang.String",

                                              " java.lang.Thread",

                                              " java.lang.Byte",

                                          };

            String[] toolArgs = {

                "-XX:+UnlockDiagnosticVMOptions",

                "TestInstanceKlassSize",

                Long.toString(app.getPid())

            };

            OutputAnalyzer jcmdOutput = jcmd(

                           app.getPid(),

                           "GC.class_stats", "VTab,ITab,OopMap,KlassBytes");

            ProcessBuilder processBuilder = ProcessTools

                                            .createJavaProcessBuilder(toolArgs);

            output = ProcessTools.executeProcess(processBuilder);

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

            output.shouldHaveExitValue(0);

            // Check whether the size matches that which jcmd outputs

            for (String instanceKlassName : instanceKlassNames) {

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

                String jcmdInstanceKlassSize = getJcmdInstanceKlassSize(

                                                      jcmdOutput,

                                                      instanceKlassName);

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

                    if (s.contains(instanceKlassName)) {

                       Asserts.assertTrue(

                          s.contains(jcmdInstanceKlassSize),

                          "The size computed by SA for" +

                          instanceKlassName + " does not match.");

                    }

                }

            }

        } finally {

            LingeredApp.stopApp(app);

        }

    }

    private static void SAInstanceKlassSize(int pid,

                                            String[] SAInstanceKlassNames) {

        HotSpotAgent agent = new HotSpotAgent();

        try {

            agent.attach(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 SAInstanceKlassName : SAInstanceKlassNames) {

            Long size = SystemDictionaryHelper.findInstanceKlass(

                            SAInstanceKlassName).getSize();

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

                               " is " + size);

        }

        agent.detach();

    }

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

        if (!Platform.shouldSAAttach()) {

            System.out.println("SA attach not expected to work - test skipped.");

            return;

        }

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

            System.out.println ("No args run. Starting with args now.");

            startMeWithArgs();

        } else {

            String[] SAInstanceKlassNames = new String[] {

                                                "java.lang.Object",

                                                "java.util.Vector",

                                                "sun.util.PreHashedMap",

                                                "java.lang.String",

                                                "java.lang.Thread",

                                                "java.lang.Byte"

                                             };

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

        }

    }

}