/*

 * 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 8072016

 * @summary Infinite deoptimization/recompilation cycles in case of arraycopy with tightly coupled allocation

 * @requires vm.flavor == "server"

 * @library /testlibrary /test/lib /

 * @modules java.base/jdk.internal.misc

 *          java.management

 *

 * @build compiler.arraycopy.TestArrayCopyNoInitDeopt

 * @run driver ClassFileInstaller sun.hotspot.WhiteBox sun.hotspot.WhiteBox$WhiteBoxPermission

 *                                jdk.test.lib.Platform

 * @run main/othervm -Xmixed -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI

 *                   -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:TypeProfileLevel=020

 *                   compiler.arraycopy.TestArrayCopyNoInitDeopt

 */

package compiler.arraycopy;

import compiler.whitebox.CompilerWhiteBoxTest;

import jdk.test.lib.Platform;

import sun.hotspot.WhiteBox;

import java.lang.reflect.Method;

public class TestArrayCopyNoInitDeopt {

    public static int[] m1(Object src) {

        if (src == null) return null;

        int[] dest = new int[10];

        try {

            System.arraycopy(src, 0, dest, 0, 10);

        } catch (ArrayStoreException npe) {

        }

        return dest;

    }

    static Object m2_src(Object src) {

        return src;

    }

    public static int[] m2(Object src) {

        if (src == null) return null;

        src = m2_src(src);

        int[] dest = new int[10];

        try {

            System.arraycopy(src, 0, dest, 0, 10);

        } catch (ArrayStoreException npe) {

        }

        return dest;

    }

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

    private static final int TIERED_STOP_AT_LEVEL = WHITE_BOX.getIntxVMFlag("TieredStopAtLevel").intValue();

    static boolean deoptimize(Method method, Object src_obj) throws Exception {

        for (int i = 0; i < 10; i++) {

            method.invoke(null, src_obj);

            if (!WHITE_BOX.isMethodCompiled(method)) {

                return true;

            }

        }

        return false;

    }

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

        if (!Platform.isServer()) {

            throw new Error("TESTBUG: Not server VM");

        }

        // Only execute if C2 is available

        if (TIERED_STOP_AT_LEVEL == CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION) {

            int[] src = new int[10];

            Object src_obj = new Object();

            Method method_m1 = TestArrayCopyNoInitDeopt.class.getMethod("m1", Object.class);

            Method method_m2 = TestArrayCopyNoInitDeopt.class.getMethod("m2", Object.class);

            // Warm up

            for (int i = 0; i < 20000; i++) {

                m1(src);

            }

            // And make sure m1 is compiled by C2

            WHITE_BOX.enqueueMethodForCompilation(method_m1, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

            if (!WHITE_BOX.isMethodCompiled(method_m1)) {

                throw new RuntimeException("m1 not compiled");

            }

            // should deoptimize for type check

            if (!deoptimize(method_m1, src_obj)) {

                throw new RuntimeException("m1 not deoptimized");

            }

            WHITE_BOX.enqueueMethodForCompilation(method_m1, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

            if (!WHITE_BOX.isMethodCompiled(method_m1)) {

                throw new RuntimeException("m1 not recompiled");

            }

            if (deoptimize(method_m1, src_obj)) {

                throw new RuntimeException("m1 deoptimized again");

            }

            if (WHITE_BOX.getUintxVMFlag("TypeProfileLevel") == 20) {

                // Same test as above but with speculative types

                // Warm up & make sure we collect type profiling

                for (int i = 0; i < 20000; i++) {

                    m2(src);

                }

                // And make sure m2 is compiled by C2

                WHITE_BOX.enqueueMethodForCompilation(method_m2, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

                if (!WHITE_BOX.isMethodCompiled(method_m2)) {

                    throw new RuntimeException("m2 not compiled");

                }

                // should deoptimize for speculative type check

                if (!deoptimize(method_m2, src_obj)) {

                    throw new RuntimeException("m2 not deoptimized");

                }

                WHITE_BOX.enqueueMethodForCompilation(method_m2, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

                if (!WHITE_BOX.isMethodCompiled(method_m2)) {

                    throw new RuntimeException("m2 not recompiled");

                }

                // should deoptimize for actual type check

                if (!deoptimize(method_m2, src_obj)) {

                    throw new RuntimeException("m2 not deoptimized");

                }

                WHITE_BOX.enqueueMethodForCompilation(method_m2, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION);

                if (!WHITE_BOX.isMethodCompiled(method_m2)) {

                    throw new RuntimeException("m2 not recompiled");

                }

                if (deoptimize(method_m2, src_obj)) {

                    throw new RuntimeException("m2 deoptimized again");

                }

            }

        }

    }

}