/*
 * 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.reflect.Method;
import java.util.stream.IntStream;

import com.oracle.java.testlibrary.Platform;

/*
 * @test OverloadCompileQueueTest
 * @library /testlibrary /../../test/lib
 * @build OverloadCompileQueueTest
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
 *                   -XX:CompileCommand=dontinline,Helper$TestCase::method
 *                   -XX:+WhiteBoxAPI -XX:-SegmentedCodeCache OverloadCompileQueueTest
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
 *                   -XX:CompileCommand=dontinline,Helper$TestCase::method
 *                   -XX:+WhiteBoxAPI -XX:+SegmentedCodeCache OverloadCompileQueueTest
 * @summary stressing code cache by overloading compile queues
 */
public class OverloadCompileQueueTest implements Runnable {
    private static final int MAX_SLEEP = 10000;
    private static final String METHOD_TO_ENQUEUE = "method";
    private static final int LEVEL_SIMPLE = 1;
    private static final int LEVEL_FULL_OPTIMIZATION = 4;
    private static final boolean INTERPRETED
            = System.getProperty("java.vm.info").startsWith("interpreted ");
    private static final boolean TIERED_COMPILATION
            = Helper.WHITE_BOX.getBooleanVMFlag("TieredCompilation");
    private static final int TIERED_STOP_AT_LEVEL
            = Helper.WHITE_BOX.getIntxVMFlag("TieredStopAtLevel").intValue();
    private static final int[] AVAILABLE_LEVELS;
    static {
        if (TIERED_COMPILATION) {
            AVAILABLE_LEVELS = IntStream
                    .rangeClosed(LEVEL_SIMPLE, TIERED_STOP_AT_LEVEL)
                    .toArray();
        } else if (Platform.isServer()) {
            AVAILABLE_LEVELS = new int[] { LEVEL_FULL_OPTIMIZATION };
        } else if (Platform.isClient() || Platform.isMinimal()) {
            AVAILABLE_LEVELS = new int[] { LEVEL_SIMPLE };
        } else {
            throw new Error(String.format(
                    "TESTBUG: unknown VM: %s", System.getProperty("java.vm.name")));
        }
    }

    public static void main(String[] args) {
        if (INTERPRETED) {
            System.err.println("Test isn't applicable for interpreter. Skip test.");
            return;
        }
        new CodeCacheStressRunner(new OverloadCompileQueueTest()).runTest();
    }

    public OverloadCompileQueueTest() {
        Helper.startInfiniteLoopThread(this::lockUnlock, 100L);
    }

    @Override
    public void run() {
        Helper.TestCase obj = Helper.TestCase.get();
        Class clazz = obj.getClass();
        Method mEnqueue;
        try {
            mEnqueue = clazz.getMethod(METHOD_TO_ENQUEUE);
        } catch (NoSuchMethodException | SecurityException e) {
            throw new Error(String.format(
                    "TESTBUG: cannot get method '%s' of class %s",
                    METHOD_TO_ENQUEUE, clazz.getName()), e);
        }
        for (int compLevel : AVAILABLE_LEVELS) {
            Helper.WHITE_BOX.enqueueMethodForCompilation(mEnqueue, compLevel);
        }
    }

    private void lockUnlock() {
        try {
            int sleep = Helper.RNG.nextInt(MAX_SLEEP);
            Helper.WHITE_BOX.lockCompilation();
            Thread.sleep(sleep);
        } catch (InterruptedException e) {
            throw new Error("TESTBUG: lockUnlocker thread was unexpectedly interrupted", e);
        } finally {
            Helper.WHITE_BOX.unlockCompilation();
        }
    }

}