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 * 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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/**

 * @test

 * @bug 8031320

 * @summary Verify that RTMLockingThreshold affects rtm state transition

 *          ProfileRTM => UseRTM.

 * @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

 *                   compiler.rtm.locking.TestRTMLockingThreshold

 */

package compiler.rtm.locking;

import compiler.testlibrary.rtm.AbortProvoker;

import compiler.testlibrary.rtm.CompilableTest;

import compiler.testlibrary.rtm.RTMLockingStatistics;

import compiler.testlibrary.rtm.RTMTestBase;

import compiler.testlibrary.rtm.predicate.SupportedCPU;

import compiler.testlibrary.rtm.predicate.SupportedVM;

import jdk.internal.misc.Unsafe;

import jdk.test.lib.Asserts;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.cli.CommandLineOptionTest;

import jdk.test.lib.cli.predicate.AndPredicate;

import java.util.List;

/**

 * Test verifies that RTMLockingThreshold option actually affects how soon

 * method will be deoptimized on low abort ratio.

 */

public class TestRTMLockingThreshold extends CommandLineOptionTest {

    private TestRTMLockingThreshold() {

        super(new AndPredicate(new SupportedVM(), new SupportedCPU()));

    }

    /**

     * We use non-zero abort threshold to avoid abort related to

     * interrupts, VMM calls, etc. during first lock attempt.

     *

     */

    private static final int MIN_ABORT_THRESHOLD = 10;

    @Override

    protected void runTestCases() throws Throwable {

        verifyLockingThreshold(0, false);

        verifyLockingThreshold(100, false);

        verifyLockingThreshold(1000, false);

        verifyLockingThreshold(0, true);

        verifyLockingThreshold(100, true);

        verifyLockingThreshold(1000, true);

    }

    private void verifyLockingThreshold(int lockingThreshold,

            boolean useStackLock) throws Throwable {

        CompilableTest test = new Test();

        int abortThreshold = Math.max(lockingThreshold / 2,

                TestRTMLockingThreshold.MIN_ABORT_THRESHOLD);

        OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(

                test,

                "-XX:CompileThreshold=1",

                CommandLineOptionTest.prepareBooleanFlag("UseRTMForStackLocks",

                        useStackLock),

                "-XX:+UseRTMDeopt",

                "-XX:RTMTotalCountIncrRate=1",

                "-XX:RTMRetryCount=0",

                CommandLineOptionTest.prepareNumericFlag("RTMAbortThreshold",

                        abortThreshold),

                CommandLineOptionTest.prepareNumericFlag("RTMLockingThreshold",

                        lockingThreshold),

                "-XX:RTMAbortRatio=100",

                "-XX:+PrintPreciseRTMLockingStatistics",

                Test.class.getName(),

                Boolean.toString(!useStackLock),

                Integer.toString(lockingThreshold)

        );

        outputAnalyzer.shouldHaveExitValue(0);

        List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(

                test.getMethodWithLockName(), outputAnalyzer.getOutput());

        Asserts.assertEQ(statistics.size(), 2, "VM output should contain two "

                + "RTM locking statistics entries.");

        /**

         * If RTMLockingThreshold==0, then we have to make at least 1 call.

         */

        long expectedValue = lockingThreshold;

        if (expectedValue == 0) {

            expectedValue++;

        }

        RTMLockingStatistics statBeforeDeopt = null;

        for (RTMLockingStatistics s : statistics) {

            if (s.getTotalLocks() == expectedValue) {

                Asserts.assertNull(statBeforeDeopt,

                        "Only one statistics entry should contain aborts");

                statBeforeDeopt = s;

            }

        }

        Asserts.assertNotNull(statBeforeDeopt, "There should be exactly one "

                + "statistics entry corresponding to ProfileRTM state.");

    }

    public static class Test implements CompilableTest {

        // Following field have to be static in order to avoid escape analysis.

        @SuppressWarnings("UnsuedDeclaration")

        private static int field = 0;

        private static final int TOTAL_ITERATIONS = 10000;

        private final Object monitor = new Object();

        @Override

        public String getMethodWithLockName() {

            return this.getClass().getName() + "::lock";

        }

        @Override

        public String[] getMethodsToCompileNames() {

            return new String[] { getMethodWithLockName() };

        }

        public void lock(boolean abort) {

            synchronized(monitor) {

                if (abort) {

                    Test.field += Test.UNSAFE.addressSize();

                }

            }

        }

        /**

         * Usage:

         * Test <inflate monitor>

         */

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

            Asserts.assertGTE(args.length, 2, "Two arguments required.");

            Test t = new Test();

            boolean shouldBeInflated = Boolean.valueOf(args[0]);

            int lockingThreshold = Integer.valueOf(args[1]);

            if (shouldBeInflated) {

                AbortProvoker.inflateMonitor(t.monitor);

            }

            for (int i = 0; i < Test.TOTAL_ITERATIONS; i++) {

                AbortProvoker.verifyMonitorState(t.monitor, shouldBeInflated);

                t.lock(i >= lockingThreshold / 2);

            }

        }

    }

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

        new TestRTMLockingThreshold().test();

    }

}