/*

 * Copyright (c) 2014, 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

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 * questions.

 */

/*

 * @test OverflowCodeCacheTest

 * @bug 8059550

 * @summary testing of code cache segments overflow

 * @library /test/lib

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

 *          java.management

 *

 * @build sun.hotspot.WhiteBox

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox

 *                                sun.hotspot.WhiteBox$WhiteBoxPermission

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

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

 *                   -XX:-SegmentedCodeCache

 *                   compiler.codecache.OverflowCodeCacheTest

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

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

 *                   -XX:+SegmentedCodeCache

 *                   compiler.codecache.OverflowCodeCacheTest

 */

package compiler.codecache;

import jdk.test.lib.Asserts;

import sun.hotspot.WhiteBox;

import sun.hotspot.code.BlobType;

import sun.hotspot.code.CodeBlob;

import java.lang.management.MemoryPoolMXBean;

import java.util.ArrayList;

import java.util.EnumSet;

public class OverflowCodeCacheTest {

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

    public static void main(String[] args) {

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

        for (BlobType type : blobTypes) {

            new OverflowCodeCacheTest(type).test();

        }

    }

    private final BlobType type;

    private final MemoryPoolMXBean bean;

    private OverflowCodeCacheTest(BlobType type) {

        this.type = type;

        this.bean = type.getMemoryPool();

    }

    private void test() {

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

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

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

        int compilationActivityMode = -1;

        try {

            long addr;

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

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

                blobs.add(addr);

                BlobType actualType = CodeBlob.getCodeBlob(addr).code_blob_type;

                if (actualType != type) {

                    // check we got allowed overflow handling

                    Asserts.assertTrue(type.allowTypeWhenOverflow(actualType),

                            type + " doesn't allow using " + actualType + " when overflow");

                }

            }

            /* now, remember compilationActivityMode to check it later, after freeing, since we

               possibly have no free cache for futher work */

            compilationActivityMode = WHITE_BOX.getCompilationActivityMode();

        } finally {

            for (Long blob : blobs) {

                WHITE_BOX.freeCodeBlob(blob);

            }

        }

        Asserts.assertNotEquals(compilationActivityMode, 1 /* run_compilation*/,

                "Compilation must be disabled when CodeCache(CodeHeap) overflows");

    }

    private long getHeapSize() {

        return bean.getUsage().getMax();

    }

}