/*
 * Copyright (c) 2015, 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
 * @bug 8138651
 * @library /testlibrary /../../test/lib
 * @build IntrinsicDisabledTest
 * @run main ClassFileInstaller sun.hotspot.WhiteBox
 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
 * @run main/othervm -Xbootclasspath/a:.
 *                   -XX:+UnlockDiagnosticVMOptions
 *                   -XX:+WhiteBoxAPI
 *                   -XX:DisableIntrinsic=_putCharVolatile
 *                   -XX:CompileCommand=option,sun.misc.Unsafe::putChar,ccstr,DisableIntrinsic,_getCharVolatile
 *                   IntrinsicDisabledTest
 */

import java.lang.reflect.Executable;
import java.util.Objects;

import sun.hotspot.WhiteBox;

public class IntrinsicDisabledTest {

    private static final WhiteBox wb = WhiteBox.getWhiteBox();

    /* Compilation level corresponding to C1. */
    private static final int COMP_LEVEL_SIMPLE = 1;

    /* Compilation level corresponding to C2. */
    private static final int COMP_LEVEL_FULL_OPTIMIZATION = 4;

    /* Determine if the VM the test is running on is a server or a
     * client VM. */
    private static boolean isServerVM() {
        return System.getProperty("java.vm.name").toLowerCase().contains("server");
    }

    /* Determine if tiered compilation is enabled. */
    private static boolean isTieredCompilationEnabled() {
        return Boolean.valueOf(Objects.toString(wb.getVMFlag("TieredCompilation")));
    }

    /* Four methods from sun.misc.Unsafe are used in this test:
     * putChar, putCharVolatile, getChar, and getCharVolatile. These
     * methods were selected because they can be intrinsified by both
     * the C1 and the C2 compiler.
     *
     * The method getMethod() returns the Executable for the method
     * corresponding to the combination of parameters. (There are four
     * possible combinations, one for each previously mentioned
     * method.) */
    static Executable getMethod(boolean isPut, boolean isVolatile) throws RuntimeException {
        Executable aMethod;

        try {
            Class aClass = Class.forName("sun.misc.Unsafe");
            if (isPut) {
                aMethod = aClass.getDeclaredMethod(isVolatile ? "putCharVolatile" : "putChar",
                                                   Object.class,
                                                   long.class,
                                                   char.class);
            } else {
                aMethod = aClass.getDeclaredMethod(isVolatile ? "getCharVolatile" : "getChar",
                                                   Object.class,
                                                   long.class);
            }
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("Test bug, method is unavailable. " + e);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("Test bug, class is unavailable. " + e);
        }

        return aMethod;
    }

    public static void test(int compLevel) {

        Executable putChar = getMethod(/*isPut =*/ true, /*isVolatile = */ false);
        Executable getChar = getMethod(/*isPut =*/ false, /*isVolatile = */ false);
        Executable putCharVolatile = getMethod(/*isPut =*/ true, /*isVolatile = */ true);
        Executable getCharVolatile = getMethod(/*isPut =*/ false, /*isVolatile = */ true);

        /* Test if globally disabling intrinsics works. The intrinsics
         * tested are putChar and putCharVolatile. */
        if (!wb.isIntrinsicAvailable(putChar, compLevel)) {
            throw new RuntimeException("Intrinsic for sun.misc.putChar is " +
                                       "not available globally " +
                                       "although it should be.");
        }

        if (wb.isIntrinsicAvailable(putCharVolatile, compLevel)) {
            throw new RuntimeException("Intrinsic for sun.misc.putCharVolatile is " +
                                       "available globally " +
                                       "although it should not be.");
        }

        /* Test if disabling intrinsics on a per-method level
         * works. The intrinsics tested are getChar and
         * getCharVolatile. The method for which the intrinsic is
         * disabled (the compilation context) is putChar. */
        if (!wb.isIntrinsicAvailable(getChar, putChar, compLevel)) {
            throw new RuntimeException("Intrinsic for sun.misc.getChar is " +
                                       "not available for intrinsification in " +
                                       "sun.misc.putChar although it should be.");
        }

        if (wb.isIntrinsicAvailable(getCharVolatile, putChar, compLevel)) {
            throw new RuntimeException("Intrinsic for sun.misc.getCharVolatile is " +
                                       "available for intrinsification in " +
                                       "sun.misc.putChar although it should not be.");
        }

        /* Test if disabling an intrinsic globally disables it on a
         * per-method level as well. The intrinsics tested are putChar
         * and putCharVolatile, the compilation context is getChar. */
        if (!wb.isIntrinsicAvailable(putChar, getChar, compLevel)) {
            throw new RuntimeException("Intrinsic for sun.misc.putChar is " +
                                       "not available for intrinsification in " +
                                       "sun.misc.getChar although it should be.");
        }

        if (wb.isIntrinsicAvailable(putCharVolatile, getChar, compLevel)) {
            throw new RuntimeException("Intrinsic for sun.mis.putCharVolatile is " +
                                       "available for intrinsification in" +
                                       "sun.misc.getChar although it should not be.");
        }
    }

    public static void main(String args[]) {
        if (isServerVM()) {
            if (isTieredCompilationEnabled()) {
                test(COMP_LEVEL_SIMPLE);
            }
            test(COMP_LEVEL_FULL_OPTIMIZATION);
        } else {
            test(COMP_LEVEL_SIMPLE);
        }
    }
}