/*

 * Copyright (c) 2019 SAP SE 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 8227680

 * @summary Tests that all FieldAccess notifications for Get*Field

            with primitive type are generated.

 * @compile FastGetField.java

 * @run main/othervm/native -agentlib:FastGetField -XX:+IgnoreUnrecognizedVMOptions -XX:-VerifyJNIFields FastGetField

 * @run main/othervm/native -agentlib:FastGetField -XX:+IgnoreUnrecognizedVMOptions -XX:-VerifyJNIFields -XX:+UnlockDiagnosticVMOptions -XX:+ForceUnreachable -XX:+SafepointALot -XX:GuaranteedSafepointInterval=1 FastGetField

 */

import java.lang.reflect.Field;

public class FastGetField {

    private static final String agentLib = "FastGetField";

    private native boolean initFieldIDs(Class c);

    private native boolean initWatchers(Class c);

    public native long accessFields(MyItem i);

    public static native long getFieldAccessCount();

    static final int loop_cnt = 10000;

    class MyItem {

        // Names should match JNI types.

        boolean Z;

        byte B;

        short S;

        char C;

        int I;

        long J;

        float F;

        double D;

        public void change_values() {

            Z = true;

            B = 1;

            C = 1;

            S = 1;

            I = 1;

            J = 1l;

            F = 1.0f;

            D = 1.0;

        }

        public void reset_values() {

            Z = false;

            B = 0;

            C = 0;

            S = 0;

            I = 0;

            J = 0l;

            F = 0.0f;

            D = 0.0;

        }

    }

    // Static initialization.

    static {

        try {

            System.loadLibrary(agentLib);

        } catch (UnsatisfiedLinkError ex) {

            System.err.println("Failed to load " + agentLib + " lib");

            System.err.println("java.library.path: " + System.getProperty("java.library.path"));

            throw ex;

        }

    }

    public void TestFieldAccess() throws Exception {

        MyItem i = new MyItem();

        if (!initFieldIDs(MyItem.class)) throw new RuntimeException("FieldID initialization failed!");

        long duration = System.nanoTime();

        for (int c = 0; c < loop_cnt; ++c) {

            if (accessFields(i) != 0l) throw new RuntimeException("Wrong initial result!");

            i.change_values();

            if (accessFields(i) != 8l) throw new RuntimeException("Wrong result after changing!");

            i.reset_values();

        }

        duration = System.nanoTime() - duration;

        System.out.println(loop_cnt + " iterations took " + duration + "ns.");

        if (getFieldAccessCount() != 0) throw new RuntimeException("Watch not yet active!");

        // Install watchers.

        if (!initWatchers(MyItem.class)) throw new RuntimeException("JVMTI missing!");

        // Try again with watchers.

        if (accessFields(i) != 0l) throw new RuntimeException("Wrong initial result!");

        i.change_values();

        if (accessFields(i) != 8l) throw new RuntimeException("Wrong result after changing!");

        if (getFieldAccessCount() != 16) throw new RuntimeException("Unexpected event count!");

    }

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

        FastGetField inst = new FastGetField();

        inst.TestFieldAccess();

    }

}