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 package runtime.valhalla.valuetypes;
  24 
  25 import java.lang.invoke.*;
  26 import jdk.experimental.value.*;
  27 
  28 import static jdk.test.lib.Asserts.*;
  29 
  30 /*
  31  * @test VboxUnbox
  32  * @summary Exercise vbox & vunbox bytecodes
  33  * @library /test/lib
  34  * @build runtime.valhalla.valuetypes.ValueCapableClass
  35  * @run main/othervm -Xint -noverify -XX:+EnableMVT runtime.valhalla.valuetypes.VboxUnbox
  36  * @run main/othervm -Xcomp -noverify -XX:+EnableMVT runtime.valhalla.valuetypes.VboxUnbox
  37  */
  38 public class VboxUnbox {
  39 
  40     public static void main(String[] args) {
  41         testCorrectBoxing();
  42         testIncorrectBoxing();
  43     }
  44 
  45     public static void testCorrectBoxing() {
  46         Class<?> vcc = ValueCapableClass.class;
  47         Class<?> dvt = ValueType.forClass(vcc).valueClass();
  48 
  49         MethodHandle newDvt = newDvtMh(dvt);
  50         MethodHandle box = boxMh(dvt, vcc);
  51         MethodHandle unbox = unboxMh(vcc, dvt);
  52 
  53         ValueCapableClass newObject = ValueCapableClass.create(3, (short)7, (short)11);
  54         ValueCapableClass newBoxed = null;
  55 
  56         try {
  57             ValueCapableClass boxed = (ValueCapableClass) MethodHandles.filterReturnValue(newDvt, box).invokeExact();
  58             // Assuming MVT1.0, where source has no way of holding an actual value at the language level, so: box(unbox(Object))
  59             newBoxed = (ValueCapableClass) MethodHandles.filterReturnValue(unbox, box).invokeExact(newObject);
  60         }
  61         catch (Throwable t) { fail("Invokation Exception", t); }
  62 
  63         assertTrue(newObject.getX() == newBoxed.getX());
  64         assertTrue(newObject.getY() == newBoxed.getY());
  65         assertTrue(newObject.getZ() == newBoxed.getZ());
  66     }
  67 
  68     public static void testIncorrectBoxing() {
  69         Class<?> vcc = ValueCapableClass.class;
  70         Class<?> dvt = ValueType.forClass(vcc).valueClass();
  71 
  72         MethodHandle newDvt = newDvtMh(dvt);
  73         MethodHandle box = boxMh(dvt, String.class); // Illegal box type
  74         try {
  75             MethodHandles.filterReturnValue(newDvt, box).invoke();
  76             fail("Expected ClassCastException");
  77         }
  78         catch (ClassCastException cce) {}
  79         catch (Throwable t) { fail("Invokation Exception", t); }
  80 
  81         // With -verify, this test will yield a VerifyError
  82         // since the constant pool entry at the index is not a
  83         // symbolic reference to a direct value class type.
  84         MethodHandle unbox = unboxMh(vcc, String.class); // Illegal unbox type
  85         try {
  86             unbox.invoke(ValueCapableClass.create());
  87             fail("Expected ClassCastException");
  88         }
  89         catch (ClassCastException cce) {}
  90         catch (Throwable t) { fail("Invokation Exception", t); }
  91     }
  92 
  93     /*
  94        Create new DVT via loading a value array element. Why this workaround:
  95        1) to avoid "ValueType.defaultValueConstant()" which may or may not be implemented with vunbox
  96     */
  97     public static MethodHandle newDvtMh(Class<?> dvt) {
  98         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "newDvt", MethodType.methodType(dvt), CODE->{
  99                 CODE.iconst_1().anewarray(dvt).iconst_0().vaload().vreturn();
 100             });
 101     }
 102 
 103     public static MethodHandle boxMh(Class<?> inClass, Class<?> outClass) {
 104         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 105                 CODE.vload(0).vbox(outClass).areturn();
 106             });
 107     }
 108 
 109     public static MethodHandle unboxMh(Class<?> inClass, Class<?> outClass)  {
 110         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 111                 CODE.aload(0).vunbox(outClass).vreturn();
 112             });
 113     }
 114 
 115 }