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/*
* Copyright (c) 2014, 2020, 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.
*/
/*
* @test RandomAllocationTest
* @key stress randomness
* @summary stressing code cache by allocating randomly sized "dummy" code blobs
* @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
* compiler.codecache.stress.RandomAllocationTest
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI
* -XX:CompileCommand=dontinline,compiler.codecache.stress.Helper$TestCase::method
* -XX:+SegmentedCodeCache
* compiler.codecache.stress.RandomAllocationTest
*/
package compiler.codecache.stress;
import sun.hotspot.code.BlobType;
import java.util.ArrayList;
import java.util.Random;
import jdk.test.lib.Utils;
public class RandomAllocationTest implements Runnable {
private static final long CODE_CACHE_SIZE
= Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize");
private static final int MAX_BLOB_SIZE = (int) (CODE_CACHE_SIZE >> 7);
private static final BlobType[] BLOB_TYPES
= BlobType.getAvailable().toArray(new BlobType[0]);
private final Random rng = Utils.getRandomInstance();
public static void main(String[] args) {
new CodeCacheStressRunner(new RandomAllocationTest()).runTest();
}
private final ArrayList<Long> blobs = new ArrayList<>();
@Override
public void run() {
boolean allocate = blobs.isEmpty() || rng.nextBoolean();
if (allocate) {
int type = rng.nextInt(BLOB_TYPES.length);
long addr = Helper.WHITE_BOX.allocateCodeBlob(
rng.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id);
if (addr != 0) {
blobs.add(addr);
}
} else {
int index = rng.nextInt(blobs.size());
Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index));
}
}
}
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