/*

 * 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.

 *

 * 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 jdk.test.lib.Asserts;

import java.lang.management.MemoryPoolMXBean;

import java.util.HashMap;

import java.util.Map;

import sun.hotspot.code.BlobType;

/*

 * @test GetUsageTest

 * @modules java.base/sun.misc

 *          java.management

 * @build GetUsageTest

 * @run main ClassFileInstaller sun.hotspot.WhiteBox

 *     sun.hotspot.WhiteBox$WhiteBoxPermission

 * @run main/othervm -Xbootclasspath/a:. -XX:CompileCommand=compileonly,null::*

 *     -XX:-UseCodeCacheFlushing -XX:-MethodFlushing -XX:+SegmentedCodeCache

 *     -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI GetUsageTest

 * @summary testing of getUsage() for segmented code cache

 */

public class GetUsageTest {

    private final BlobType btype;

    private final int allocateSize;

    public GetUsageTest(BlobType btype, int allocSize) {

        this.btype = btype;

        this.allocateSize = allocSize;

    }

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

        for (BlobType btype : BlobType.getAvailable()) {

            for (int allocSize = 10; allocSize < 100000; allocSize *= 10) {

                new GetUsageTest(btype, allocSize).runTest();

            }

        }

    }

    protected final Map<MemoryPoolMXBean, Long> getBeanUsages() {

        Map<MemoryPoolMXBean, Long> beanUsages = new HashMap<>();

        for (BlobType bt : BlobType.getAvailable()) {

            beanUsages.put(bt.getMemoryPool(),

                    bt.getMemoryPool().getUsage().getUsed());

        }

        return beanUsages;

    }

    protected void runTest() {

        MemoryPoolMXBean[] predictableBeans = BlobType.getAvailable().stream()

                .filter(CodeCacheUtils::isCodeHeapPredictable)

                .map(BlobType::getMemoryPool)

                .toArray(MemoryPoolMXBean[]::new);

        Map<MemoryPoolMXBean, Long> initial = getBeanUsages();

        long addr = 0;

        try {

            addr = CodeCacheUtils.WB.allocateCodeBlob(allocateSize, btype.id);

            Map<MemoryPoolMXBean, Long> current = getBeanUsages();

            long blockCount = Math.floorDiv(allocateSize

                    + CodeCacheUtils.getHeaderSize(btype)

                    + CodeCacheUtils.SEGMENT_SIZE - 1, CodeCacheUtils.SEGMENT_SIZE);

            long usageUpperEstimate = Math.max(blockCount,

                    CodeCacheUtils.MIN_BLOCK_LENGTH) * CodeCacheUtils.SEGMENT_SIZE;

            for (MemoryPoolMXBean entry : predictableBeans) {

                long diff = current.get(entry) - initial.get(entry);

                if (entry.equals(btype.getMemoryPool())) {

                    if (CodeCacheUtils.isCodeHeapPredictable(btype)) {

                        Asserts.assertFalse(diff <= 0L || diff > usageUpperEstimate,

                                String.format("Pool %s usage increase was reported "

                                        + "unexpectedly as increased by %d using "

                                        + "allocation size %d", entry.getName(),

                                        diff, allocateSize));

                    }

                } else {

                    CodeCacheUtils.assertEQorGTE(btype, diff, 0L,

                            String.format("Pool %s usage changed unexpectedly while"

                                    + " trying to increase: %s using allocation "

                                    + "size %d", entry.getName(),

                                    btype.getMemoryPool().getName(), allocateSize));

                }

            }

        } finally {

            if (addr != 0) {

                CodeCacheUtils.WB.freeCodeBlob(addr);

            }

        }

        System.out.printf("INFO: Scenario finished successfully for %s%n",

                btype.getMemoryPool().getName());

    }

}