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
  37  *                   -XX:+UnlockDiagnosticVMOptions -XX:DisableIntrinsic=_isAssignableFrom
  38  *                   runtime.valhalla.valuetypes.VboxUnbox
  39  */
  40 public class VboxUnbox {
  41 
  42     public static void main(String[] args) {
  43         testCorrectBoxing();
  44         testIncorrectBoxing();
  45     }
  46 
  47     public static void testCorrectBoxing() {
  48         Class<?> vcc = ValueCapableClass.class;
  49         Class<?> dvt = ValueType.forClass(vcc).valueClass();
  50 
  51         MethodHandle newDvt = newDvtMh(dvt);
  52         MethodHandle box = boxMh(dvt, vcc);
  53         MethodHandle unbox = unboxMh(vcc, dvt);
  54 
  55         ValueCapableClass newObject = ValueCapableClass.create(3, (short)7, (short)11);
  56         ValueCapableClass newBoxed = null;
  57 
  58         try {
  59             ValueCapableClass boxed = (ValueCapableClass) MethodHandles.filterReturnValue(newDvt, box).invokeExact();
  60             // Assuming MVT1.0, where source has no way of holding an actual value at the language level, so: box(unbox(Object))
  61             newBoxed = (ValueCapableClass) MethodHandles.filterReturnValue(unbox, box).invokeExact(newObject);
  62         }
  63         catch (Throwable t) { fail("Invokation Exception", t); }
  64 
  65         assertTrue(newObject.getX() == newBoxed.getX());
  66         assertTrue(newObject.getY() == newBoxed.getY());
  67         assertTrue(newObject.getZ() == newBoxed.getZ());
  68     }
  69 
  70     public static void testIncorrectBoxing() {
  71         Class<?> vcc = ValueCapableClass.class;
  72         Class<?> dvt = ValueType.forClass(vcc).valueClass();
  73 
  74         MethodHandle newDvt = newDvtMh(dvt);
  75         MethodHandle box = boxMh(dvt, String.class); // Illegal box type
  76         try {
  77             MethodHandles.filterReturnValue(newDvt, box).invoke();
  78             fail("Expected ClassCastException");
  79         }
  80         catch (ClassCastException cce) {}
  81         catch (Throwable t) { fail("Invokation Exception", t); }
  82 
  83         MethodHandle unbox = unboxMh(vcc, String.class); // Illegal unbox type
  84         try {
  85             unbox.invoke(ValueCapableClass.create());
  86             fail("Expected ClassCastException");
  87         }
  88         catch (ClassCastException cce) {}
  89         catch (Throwable t) { fail("Invokation Exception", t); }
  90     }
  91 
  92     /*
  93        Create new DVT via loading a value array element. Why this workaround:
  94        1) to avoid "ValueType.defaultValueConstant()" which may or may not be implemented with vunbox
  95        2) vnew requires valuefactory attribute, which at the time of writing isn't generated with the DVT
  96        3) vdefault doesn't exist at the time of writing
  97     */
  98     public static MethodHandle newDvtMh(Class<?> dvt) {
  99         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "newDvt", MethodType.methodType(dvt), CODE->{
 100                 CODE.iconst_1().anewarray(dvt).iconst_0().vaload().vreturn();
 101             });
 102     }
 103 
 104     public static MethodHandle boxMh(Class<?> inClass, Class<?> outClass) {
 105         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 106                 CODE.vload(0).vbox(outClass).areturn();
 107             });
 108     }
 109 
 110     public static MethodHandle unboxMh(Class<?> inClass, Class<?> outClass)  {
 111         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 112                 CODE.aload(0).vunbox(outClass).vreturn();
 113             });
 114     }
 115 
 116 }