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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

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 * 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 8230677

 * @summary Test JVMTI's GetOwnedMonitorInfo with scalar replaced objects and eliminated locks on stack (optimizations based on escape analysis).

 * @comment Without RFE 8227745 escape analysis needs to be switched off to pass the test. For the implementation of RFE 8227745 it serves as a regression test.

 * @requires (vm.compMode != "Xcomp" & vm.compiler2.enabled)

 * @library /test/lib

 * @compile GetOwnedMonitorInfoWithEATest.java

 * @run main/othervm/native

 *                  -agentlib:GetOwnedMonitorInfoWithEATest

 *                  -XX:+UnlockDiagnosticVMOptions

 *                  -Xms128m -Xmx128m

 *                  -XX:CompileCommand=dontinline,*::dontinline_*

 *                  -XX:+PrintCompilation

 *                  -XX:+PrintInlining

 *                  -XX:-TieredCompilation

 *                  -Xbatch

 *                  -XX:CICompilerCount=1

 *                  -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking

 *                  GetOwnedMonitorInfoWithEATest

 * @run main/othervm/native

 *                  -agentlib:GetOwnedMonitorInfoWithEATest

 *                  -XX:+UnlockDiagnosticVMOptions

 *                  -Xms128m -Xmx128m

 *                  -XX:CompileCommand=dontinline,*::dontinline_*

 *                  -XX:+PrintCompilation

 *                  -XX:+PrintInlining

 *                  -XX:-TieredCompilation

 *                  -Xbatch

 *                  -XX:CICompilerCount=1

 *                  -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:-EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking -XX:-UseOptoBiasInlining

 *                  GetOwnedMonitorInfoWithEATest

 * @run main/othervm/native

 *                  -agentlib:GetOwnedMonitorInfoWithEATest

 *                  -XX:+UnlockDiagnosticVMOptions

 *                  -Xms128m -Xmx128m

 *                  -XX:CompileCommand=dontinline,*::dontinline_*

 *                  -XX:+PrintCompilation

 *                  -XX:+PrintInlining

 *                  -XX:-TieredCompilation

 *                  -Xbatch

 *                  -XX:CICompilerCount=1

 *                  -XX:+DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking

 *                  GetOwnedMonitorInfoWithEATest

 * @run main/othervm/native

 *                  -agentlib:GetOwnedMonitorInfoWithEATest

 *                  -XX:+UnlockDiagnosticVMOptions

 *                  -Xms128m -Xmx128m

 *                  -XX:CompileCommand=dontinline,*::dontinline_*

 *                  -XX:+PrintCompilation

 *                  -XX:+PrintInlining

 *                  -XX:-TieredCompilation

 *                  -Xbatch

 *                  -XX:CICompilerCount=1

 *                  -XX:-DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:+UseBiasedLocking

 *                  GetOwnedMonitorInfoWithEATest

 * @run main/othervm/native

 *                  -agentlib:GetOwnedMonitorInfoWithEATest

 *                  -XX:+UnlockDiagnosticVMOptions

 *                  -Xms128m -Xmx128m

 *                  -XX:CompileCommand=dontinline,*::dontinline_*

 *                  -XX:+PrintCompilation

 *                  -XX:+PrintInlining

 *                  -XX:-TieredCompilation

 *                  -Xbatch

 *                  -XX:CICompilerCount=1

 *                  -XX:+DoEscapeAnalysis -XX:+EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking

 *                  GetOwnedMonitorInfoWithEATest

 * @run main/othervm/native

 *                  -agentlib:GetOwnedMonitorInfoWithEATest

 *                  -XX:+UnlockDiagnosticVMOptions

 *                  -Xms128m -Xmx128m

 *                  -XX:CompileCommand=dontinline,*::dontinline_*

 *                  -XX:+PrintCompilation

 *                  -XX:+PrintInlining

 *                  -XX:-TieredCompilation

 *                  -Xbatch

 *                  -XX:CICompilerCount=1

 *                  -XX:+DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking

 *                  GetOwnedMonitorInfoWithEATest

 * @run main/othervm/native

 *                  -agentlib:GetOwnedMonitorInfoWithEATest

 *                  -XX:+UnlockDiagnosticVMOptions

 *                  -Xms128m -Xmx128m

 *                  -XX:CompileCommand=dontinline,*::dontinline_*

 *                  -XX:+PrintCompilation

 *                  -XX:+PrintInlining

 *                  -XX:-TieredCompilation

 *                  -Xbatch

 *                  -XX:CICompilerCount=1

 *                  -XX:-DoEscapeAnalysis -XX:-EliminateAllocations -XX:+EliminateLocks -XX:+EliminateNestedLocks -XX:-UseBiasedLocking

 *                  GetOwnedMonitorInfoWithEATest

 */

import jdk.test.lib.Asserts;

public class GetOwnedMonitorInfoWithEATest {

    public static final int COMPILE_THRESHOLD = 20000;

    /**

     * Native wrapper arround JVMTI's GetOwnedMonitorInfo().

     * @param t The thread for which the owned monitors information should be retrieved.

     * @param ownedMonitors Array filled in by the call with the objects associated

     *        with the monitors owned by the given thread.

     * @param depths Per owned monitor the depth of the frame were it was locked.

     *        Filled in by the call

     * @return Number of monitors owned by the given thread.

     */

    public static native int getOwnedMonitorInfo(Thread t, Object[] ownedMonitors);

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

        new GetOwnedMonitorInfoWithEATest().runTest();

    }

    public void runTest() throws Exception {

        new TestCase_1().run();

        new TestCase_2().run();

    }

    public static abstract class TestCaseBase implements Runnable {

        public long checkSum;

        public boolean doLoop;

        public volatile long loopCount;

        public volatile boolean targetIsInLoop;

        public void run() {

            try {

                msgHL("Executing test case " + getClass().getName());

                warmUp();

                runTest();

            } catch (Exception e) {

                Asserts.fail("Unexpected Exception", e);

            }

        }

        public void warmUp() {

            int callCount = COMPILE_THRESHOLD + 1000;

            doLoop = true;

            while (callCount-- > 0) {

                dontinline_testMethod();

            }

        }

        public abstract void runTest() throws Exception;

        public abstract void dontinline_testMethod();

        public long dontinline_endlessLoop() {

            long cs = checkSum;

            while (doLoop && loopCount-- > 0) {

                targetIsInLoop = true;

                checkSum += checkSum % ++cs;

            }

            loopCount = 3;

            targetIsInLoop = false;

            return checkSum;

        }

        public void waitUntilTargetThreadHasEnteredEndlessLoop() throws Exception {

            while(!targetIsInLoop) {

                msg("Target has not yet entered the loop. Sleep 200ms.");

                try { Thread.sleep(200); } catch (InterruptedException e) { /*ignore */ }

            }

            msg("Target has entered the loop.");

        }

        public void terminateEndlessLoop() throws Exception {

            msg("Terminate endless loop");

            do {

                doLoop = false;

            } while(targetIsInLoop);

        }

        public void msg(String m) {

            System.out.println();

            System.out.println("### " + m);

            System.out.println();

        }

        public void msgHL(String m) {

            System.out.println();

            System.out.println("#####################################################");

            System.out.println("### " + m);

            System.out.println("###");

            System.out.println();

        }

    }

    /**

     * Starts target thread T and then queries monitor information for T using JVMTI's GetOwnedMonitorInfo().

     * With escape analysis enabled the jit compiled method {@link #dontinline_testMethod()} has

     * scalar replaced objects with eliminated (nested) locking in scope when the monitor

     * information is retrieved. Effectively the objects escape through the JVMTI call. This works

     * only with RFE 8227745. Without it escape analysis needs to be disabled.

     */

    public static class TestCase_1 extends TestCaseBase {

        public void runTest() throws Exception {

            loopCount = 1L << 62; // endless loop

            Thread t1 = new Thread(() -> dontinline_testMethod(), "Target Thread");

            t1.start();

            try {

                waitUntilTargetThreadHasEnteredEndlessLoop();

                int expectedMonitorCount = 1;

                int resultSize = expectedMonitorCount + 3;

                Object[] ownedMonitors = new Object[resultSize];

                msg("Get monitor info");

                int monitorCount = getOwnedMonitorInfo(t1, ownedMonitors);

                terminateEndlessLoop();

                t1.join();

                Asserts.assertGreaterThanOrEqual(monitorCount, 0, "getOwnedMonitorsFor() call failed");

                msg("Monitor info:");

                for (int i = 0; i < monitorCount; i++) {

                    System.out.println(i + ": cls=" + (ownedMonitors[i] != null ? ownedMonitors[i].getClass() : null));

                }

                Asserts.assertEQ(monitorCount, expectedMonitorCount, "unexpected monitor count returned by getOwnedMonitorsFor()");

                Asserts.assertNotNull(ownedMonitors[0]);

                Asserts.assertSame(ownedMonitors[0].getClass(), LockCls.class);

            } finally {

                terminateEndlessLoop();

                t1.join();

            }

        }

        public void dontinline_testMethod() {

            LockCls l1 = new LockCls();        // to be scalar replaced

            synchronized (l1) {

                inlinedTestMethodWithNestedLocking(l1);

            }

        }

        public void inlinedTestMethodWithNestedLocking(LockCls l1) {

            synchronized (l1) {              // nested

                dontinline_endlessLoop();

            }

        }

    }

    /**

     * Similar to {@link TestCase_1}. Additionally the target thread T has got eliminated locking

     * for a synchronized method of a different type {@linkplain LockCls2}.

     */

    public static class TestCase_2 extends TestCaseBase {

        public void runTest() throws Exception {

            loopCount = 1L << 62; // endless loop

            Thread t1 = new Thread(() -> dontinline_testMethod(), "Target Thread");

            t1.start();

            try {

                waitUntilTargetThreadHasEnteredEndlessLoop();

                int expectedMonitorCount = 2;

                int resultSize = expectedMonitorCount + 3;

                Object[] ownedMonitors = new Object[resultSize];

                msg("Get monitor info");

                int monitorCount = getOwnedMonitorInfo(t1, ownedMonitors);

                terminateEndlessLoop();

                t1.join();

                Asserts.assertGreaterThanOrEqual(monitorCount, 0, "getOwnedMonitorsFor() call failed");

                msg("Monitor info:");

                for (int i = 0; i < monitorCount; i++) {

                    System.out.println(i + ": cls=" + (ownedMonitors[i] != null ? ownedMonitors[i].getClass() : null));

                }

                Asserts.assertEQ(monitorCount, expectedMonitorCount, "unexpected monitor count returned by getOwnedMonitorsFor()");

                Asserts.assertNotNull(ownedMonitors[0]);

                Asserts.assertSame(ownedMonitors[0].getClass(), LockCls2.class);

                Asserts.assertNotNull(ownedMonitors[1]);

                Asserts.assertSame(ownedMonitors[1].getClass(), LockCls.class);

            } finally {

                terminateEndlessLoop();

                t1.join();

            }

        }

        public void dontinline_testMethod() {

            LockCls l1 = new LockCls();

            synchronized (l1) {

                inlinedTestMethodWithNestedLocking(l1);

            }

        }

        public void inlinedTestMethodWithNestedLocking(LockCls l1) {

            synchronized (l1) {

                dontinline_testMethod2();

            }

        }

        public void dontinline_testMethod2() {

            // Call synchronized method. Receiver of the call will be scalar replaced,

            // and locking will be eliminated. Here we use a different type.

            new LockCls2().inline_synchronized_testMethod(this);

        }

    }

    public static class LockCls {

    }

    public static class LockCls2 {

        public synchronized void inline_synchronized_testMethod(TestCaseBase testCase) {

            testCase.dontinline_endlessLoop();

        }

    }

}