/*

 * Copyright (c) 2014, 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 java.lang.management.MemoryPoolMXBean;

import java.util.EnumSet;

import java.util.ArrayList;

import sun.hotspot.WhiteBox;

import sun.hotspot.code.BlobType;

import com.oracle.java.testlibrary.Asserts;

/*

 * @test AllocationCodeBlobTest

 * @bug 8059624

 * @library /testlibrary /testlibrary/whitebox

 * @build AllocationCodeBlobTest

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *                              sun.hotspot.WhiteBox$WhiteBoxPermission

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

 *                   -XX:+WhiteBoxAPI -XX:CompileCommand=compileonly,null::*

 *                   -XX:-SegmentedCodeCache AllocationCodeBlobTest

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

 *                   -XX:+WhiteBoxAPI -XX:CompileCommand=compileonly,null::*

 *                   -XX:+SegmentedCodeCache AllocationCodeBlobTest

 * @summary testing of WB::allocate/freeCodeBlob()

 */

public class AllocationCodeBlobTest {

    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();

    private static final long CODE_CACHE_SIZE

            = WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize");

    private static final int SIZE = 1;

    public static void main(String[] args) {

        // check that Sweeper handels dummy blobs correctly

        new ForcedSweeper(500).start();

        EnumSet<BlobType> blobTypes = BlobType.getAvailable();

        for (BlobType type : blobTypes) {

            new AllocationCodeBlobTest(type).test();

        }

    }

    private final BlobType type;

    private final MemoryPoolMXBean bean;

    private AllocationCodeBlobTest(BlobType type) {

        this.type = type;

        bean = type.getMemoryPool();

    }

    private void test() {

        System.out.printf("type %s%n", type);

        long start = getUsage();

        long addr = WHITE_BOX.allocateCodeBlob(SIZE, type.id);

        Asserts.assertNE(0, addr, "allocation failed");

        long firstAllocation = getUsage();

        Asserts.assertLTE(start + SIZE, firstAllocation,

                "allocation should increase memory usage: "

                + start + " + " + SIZE + " <= " + firstAllocation);

        WHITE_BOX.freeCodeBlob(addr);

        long firstFree = getUsage();

        Asserts.assertLTE(firstFree, firstAllocation,

                "free shouldn't increase memory usage: "

                + firstFree + " <= " + firstAllocation);

        addr = WHITE_BOX.allocateCodeBlob(SIZE, type.id);

        Asserts.assertNE(0, addr, "allocation failed");

        long secondAllocation = getUsage();

        Asserts.assertEQ(firstAllocation, secondAllocation);

        WHITE_BOX.freeCodeBlob(addr);

        System.out.println("allocating till possible...");

        ArrayList<Long> blobs = new ArrayList<>();

        int size = (int) (CODE_CACHE_SIZE >> 7);

        while ((addr = WHITE_BOX.allocateCodeBlob(size, type.id)) != 0) {

            blobs.add(addr);

        }

        for (Long blob : blobs) {

            WHITE_BOX.freeCodeBlob(blob);

        }

    }

    private long getUsage() {

        return bean.getUsage().getUsed();

    }

    private static class ForcedSweeper extends Thread {

        private final int millis;

        public ForcedSweeper(int millis) {

            super("ForcedSweeper");

            setDaemon(true);

            this.millis = millis;

        }

        public void run() {

            try {

                while (true) {

                    WHITE_BOX.forceNMethodSweep();

                    Thread.sleep(millis);

                }

            } catch (InterruptedException e) {

                Thread.currentThread().interrupt();

                throw new Error(e);

            }

        }

    }

}