1 /*

     2  * Copyright (c) 2019 SAP SE and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug 8227680

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

    28             with primitive type are generated.

    29  * @compile FastGetField.java

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

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

    32  */

    33 

    34 import java.lang.reflect.Field;

    35 

    36 

    37 public class FastGetField {

    38 

    39     private static final String agentLib = "FastGetField";

    40 

    41     private native boolean initFieldIDs(Class c);

    42     private native boolean initWatchers(Class c);

    43     public native long accessFields(MyItem i);

    44     public static native long getFieldAccessCount();

    45 

    46     static final int loop_cnt = 10000;

    47 

    48 

    49     class MyItem {

    50         // Names should match JNI types.

    51         boolean Z;

    52         byte B;

    53         short S;

    54         char C;

    55         int I;

    56         long J;

    57         float F;

    58         double D;

    59 

    60         public void change_values() {

    61             Z = true;

    62             B = 1;

    63             C = 1;

    64             S = 1;

    65             I = 1;

    66             J = 1l;

    67             F = 1.0f;

    68             D = 1.0;

    69         }

    70 

    71         public void reset_values() {

    72             Z = false;

    73             B = 0;

    74             C = 0;

    75             S = 0;

    76             I = 0;

    77             J = 0l;

    78             F = 0.0f;

    79             D = 0.0;

    80         }

    81     }

    82 

    83     // Static initialization.

    84     static {

    85         try {

    86             System.loadLibrary(agentLib);

    87         } catch (UnsatisfiedLinkError ex) {

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

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

    90             throw ex;

    91         }

    92     }

    93 

    94     public void TestFieldAccess() throws Exception {

    95         MyItem i = new MyItem();

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

    97 

    98         long duration = System.nanoTime();

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

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

   101             i.change_values();

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

   103             i.reset_values();

   104         }

   105         duration = System.nanoTime() - duration;

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

   107 

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

   109 

   110         // Install watchers.

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

   112 

   113         // Try again with watchers.

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

   115         i.change_values();

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

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

   118     }

   119 

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

   121         FastGetField inst = new FastGetField();

   122         inst.TestFieldAccess();

   123     }

   124 }