1 /*
   2  * Copyright (c) 2017, Oracle 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 /*
  26  * @test
  27  * @summary test reflection on value types
  28  * @compile -XDenableValueTypes Point.java
  29  * @run main/othervm -Xverify:none Reflection
  30  */
  31 
  32 import java.lang.reflect.*;
  33 
  34 public class Reflection {
  35     public static void main(String... args) throws Exception {
  36         Reflection test = new Reflection("Point");
  37         test.newInstance();
  38         test.constructor();
  39         test.accessField();
  40         test.setAccessible();
  41         test.trySetAccessible();
  42         test.staticField();
  43     }
  44 
  45     private final Class<?> c;
  46     private final Constructor<?> ctor;
  47     private final Field field;
  48     Reflection(String cn) throws Exception {
  49         this.c = Class.forName(cn);
  50         if (!c.isValue()) {
  51             throw new RuntimeException(cn + " is not a value class");
  52         }
  53 
  54         this.ctor = Point.class.getDeclaredConstructor();
  55         this.field = c.getField("x");
  56     }
  57 
  58     void accessField() throws Exception {
  59         Point o = Point.origin;
  60         if (field.getInt(o) != o.x) {
  61             throw new RuntimeException("Unexpected Point.x value: " +  field.getInt(o));
  62         }
  63 
  64         try {
  65             field.setInt(o, 100);
  66             throw new RuntimeException("IllegalAccessException not thrown");
  67         } catch (IllegalAccessException e) {}
  68     }
  69 
  70     void newInstance() throws Exception {
  71         try {
  72             Object o = c.newInstance();
  73             throw new RuntimeException("newInstance expected to be unsupported on value class");
  74         } catch (IllegalAccessException e) {}
  75     }
  76 
  77     void constructor() throws Exception {
  78         try {
  79             ctor.newInstance();
  80             throw new RuntimeException("IllegalAccessException not thrown");
  81         } catch (IllegalAccessException e) { }
  82     }
  83 
  84     void setAccessible() throws Exception {
  85         try {
  86             ctor.setAccessible(true);
  87             throw new RuntimeException("InaccessibleObjectException not thrown");
  88         } catch (InaccessibleObjectException e) { e.printStackTrace(); }
  89         try {
  90             field.setAccessible(true);
  91             throw new RuntimeException("InaccessibleObjectException not thrown");
  92         } catch (InaccessibleObjectException e) { e.printStackTrace(); }
  93     }
  94 
  95     void trySetAccessible() throws Exception {
  96         if (ctor.trySetAccessible()) {
  97             throw new RuntimeException("trySetAccessible should not succeed");
  98         }
  99         if (field.trySetAccessible()) {
 100             throw new RuntimeException("trySetAccessible should not succeed");
 101         }
 102     }
 103 
 104     void staticField() throws Exception {
 105         Field f = Point.class.getDeclaredField("origin");
 106         if (f.trySetAccessible()) {
 107             throw new RuntimeException("trySetAccessible should not succeed");
 108         }
 109         try {
 110             f.setAccessible(true);
 111             throw new RuntimeException("IllegalAccessException not thrown");
 112         } catch (InaccessibleObjectException e) { }
 113     }
 114 }