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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

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 *

 * 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,

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/**

 * @test

 * @bug 8031320

 * @summary Verify that on low abort ratio method will be recompiled.

 * @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.TestRTMDeoptOnLowAbortRatio

 */

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 jdk.internal.misc.Unsafe;

import jdk.test.lib.Asserts;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.cli.CommandLineOptionTest;

import java.util.List;

/**

 * Test verifies that low abort ratio method will be deoptimized with

 * <i>rtm_state_change</i> reason and will continue to use RTM-based lock

 * elision after that.

 * This test make asserts on total locks count done by compiled method,

 * so in order to avoid issue with retriable locks -XX:RTMRetryCount=0 is used.

 * For more details on that issue see {@link TestUseRTMAfterLockInflation}.

 */

public class TestRTMDeoptOnLowAbortRatio {

    private static final long LOCKING_THRESHOLD = 100L;

    private static final long ABORT_THRESHOLD = LOCKING_THRESHOLD / 2L;

    protected void runTestCases() throws Throwable {

        verifyRTMDeopt(false);

        verifyRTMDeopt(true);

    }

    private void verifyRTMDeopt(boolean useStackLock) throws Throwable {

        CompilableTest test = new Test();

        String logFileName = String.format("rtm_deopt_%s_stack_lock.xml",

                                           useStackLock ? "use" : "no");

        OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(

                logFileName,

                test,

                "-XX:+UseRTMDeopt",

                CommandLineOptionTest.prepareBooleanFlag("UseRTMForStackLocks",

                        useStackLock),

                CommandLineOptionTest.prepareNumericFlag("RTMLockingThreshold",

                        TestRTMDeoptOnLowAbortRatio.LOCKING_THRESHOLD),

                CommandLineOptionTest.prepareNumericFlag("RTMAbortThreshold",

                        TestRTMDeoptOnLowAbortRatio.ABORT_THRESHOLD),

                "-XX:RTMAbortRatio=100",

                "-XX:CompileThreshold=1",

                "-XX:RTMRetryCount=0",

                "-XX:RTMTotalCountIncrRate=1",

                "-XX:+PrintPreciseRTMLockingStatistics",

                Test.class.getName(),

                Boolean.toString(!useStackLock)

        );

        outputAnalyzer.shouldHaveExitValue(0);

        int firedTraps = RTMTestBase.firedRTMStateChangeTraps(logFileName);

        Asserts.assertEQ(firedTraps, 1,

                        "Expected to get only one deoptimization due to rtm"

                        + " state change");

        List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(

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

        Asserts.assertEQ(statistics.size(), 2,

                         "VM output should contain two RTM locking "

                         + "statistics entries for method "

                         + test.getMethodWithLockName());

        RTMLockingStatistics statisticsBeforeDeopt = null;

        for (RTMLockingStatistics s : statistics) {

            if (s.getTotalLocks()

                    == TestRTMDeoptOnLowAbortRatio.LOCKING_THRESHOLD) {

                Asserts.assertNull(statisticsBeforeDeopt,

                        "Only one abort was expected during test run");

                statisticsBeforeDeopt = s;

            }

        }

        Asserts.assertNotNull(statisticsBeforeDeopt,

                "After LockThreshold was reached, method should be recompiled "

                + "with rtm lock eliding.");

    }

    public static class Test implements CompilableTest {

        private static final Unsafe UNSAFE = Unsafe.getUnsafe();

        private final Object monitor = new Object();

        @Override

        public String getMethodWithLockName() {

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

        }

        @Override

        public String[] getMethodsToCompileNames() {

            return new String[] { getMethodWithLockName() };

        }

        public void forceAbort(boolean abort) {

            synchronized(monitor) {

                if (abort) {

                    Test.UNSAFE.pageSize();

                }

            }

        }

        /**

         * Usage:

         * Test <inflate monitor>

         */

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

            Asserts.assertGTE(args.length, 1, "One argument required.");

            Test t = new Test();

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

            if (shouldBeInflated) {

                AbortProvoker.inflateMonitor(t.monitor);

            }

            for (int i = 0; i < AbortProvoker.DEFAULT_ITERATIONS; i++) {

                AbortProvoker.verifyMonitorState(t.monitor, shouldBeInflated);

                t.forceAbort(i >= TestRTMDeoptOnLowAbortRatio.ABORT_THRESHOLD);

            }

        }

    }

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

        new TestRTMDeoptOnLowAbortRatio().runTestCases();

    }

}