/*

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 * 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 ReturnBlobToWrongHeapTest

 * @key stress

 * @summary Test if VM attempts to return code blobs to an incorrect code heap or to outside of the code cache.

 * @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=dontinline,compiler.codecache.stress.Helper$TestCase::method

 *                   -XX:+SegmentedCodeCache

 *                   -XX:ReservedCodeCacheSize=16M

 *                   -XX:CodeCacheMinBlockLength=1

 *                   compiler.codecache.stress.ReturnBlobToWrongHeapTest

 */

package compiler.codecache.stress;

import sun.hotspot.code.BlobType;

import java.util.ArrayList;

public class ReturnBlobToWrongHeapTest {

    private static final long largeBlobSize = Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize") >> 6;

    private static final long codeCacheMinBlockLength = Helper.WHITE_BOX.getUintxVMFlag("CodeCacheMinBlockLength");

    private static final BlobType[] BLOB_TYPES = BlobType.getAvailable().toArray(new BlobType[0]);

    // Allocate blob in first code heap (the code heap with index 0).

    private static long allocate(int size) {

        return Helper.WHITE_BOX.allocateCodeBlob(size, BLOB_TYPES[0].id);

    }

    // Free blob.

    private static void free(long address) {

        Helper.WHITE_BOX.freeCodeBlob(address);

    }

    public static void main(String[] args) {

        if (codeCacheMinBlockLength == 1) {

            // Fill first code heap with large blobs until allocation fails.

            long address;

            while ((address = allocate((int)largeBlobSize)) != 0) {

            }

            // Allocate segment-sized blocks in first code heap.

            long lastSegmentSizedAddress = 0; // Address of the last segment-sized blob allocated

            while ((address = allocate(0)) != 0) {

                lastSegmentSizedAddress = address;

            }

            if (lastSegmentSizedAddress == 0) {

                throw new RuntimeException("Test failed: Not possible to allocate segment-sized blob");

            }

            // Remove last segment-sized block from the first code heap.

            free(lastSegmentSizedAddress);

        } else {

            throw new RuntimeException("Test requires CodeCacheMinBlockLength==1; CodeCacheMinBlockLength is " +

                                       codeCacheMinBlockLength);

        }

    }

}