/*

 * Copyright (c) 2014, 2015, 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.

 *

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 */

/*

 * @test

 * @bug 8054836

 * @summary Test to verify correctness of malloc tracking

 * @key nmt jcmd

 * @modules java.base/sun.misc

 *          java.management

 * @build MallocTrackingVerify

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=detail MallocTrackingVerify

 *

 */

import java.util.ArrayList;

import java.util.Random;

import jdk.test.lib.*;

import sun.hotspot.WhiteBox;

public class MallocTrackingVerify {

    private static int MAX_ALLOC = 4 * 1024;

    static ArrayList<MallocMemory> mallocd_memory = new ArrayList<MallocMemory>();

    static long mallocd_total = 0;

    public static WhiteBox wb = WhiteBox.getWhiteBox();

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

        OutputAnalyzer output;

        // Grab my own PID

        String pid = Integer.toString(ProcessTools.getProcessId());

        ProcessBuilder pb = new ProcessBuilder();

        Random random = new Random();

        // Allocate small amounts of memory with random pseudo call stack

        while (mallocd_total < MAX_ALLOC) {

            int size = random.nextInt(31) + 1;

            long addr = wb.NMTMallocWithPseudoStack(size, random.nextInt());

            if (addr != 0) {

                MallocMemory mem = new MallocMemory(addr, size);

                mallocd_memory.add(mem);

                mallocd_total += size;

            } else {

                System.out.println("Out of malloc memory");

                break;

            }

        }

        pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid, "VM.native_memory", "summary" });

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

        output.shouldContain("Test (reserved=4KB, committed=4KB)");

        // Free

        for (MallocMemory mem : mallocd_memory) {

            wb.NMTFree(mem.addr());

        }

        // Run 'jcmd <pid> VM.native_memory summary', check for expected output

        pb.command(new String[] { JDKToolFinder.getJDKTool("jcmd"), pid,

                "VM.native_memory", "summary" });

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

        output.shouldNotContain("Test (reserved=");

    }

    static class MallocMemory {

        private long addr;

        private int size;

        MallocMemory(long addr, int size) {

            this.addr = addr;

            this.size = size;

        }

        long addr() {

            return this.addr;

        }

        int size() {

            return this.size;

        }

    }

}