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.verifier;
  24 
  25 import java.lang.invoke.*;
  26 import jdk.experimental.value.*;
  27 
  28 import static jdk.test.lib.Asserts.*;
  29 
  30 /*
  31  * @test VunboxErrorIndex
  32  * @summary Exercise the verifier for vunbox bytecode with a non-value type CP index.
  33  * @library /test/lib
  34  * @build runtime.valhalla.valuetypes.verifier.ValueCapableClass
  35  * @run main/othervm -Xint -verify -XX:+EnableMVT runtime.valhalla.valuetypes.verifier.VunboxErrorIndex
  36  */
  37 public class VunboxErrorIndex {
  38 
  39     public static void main(String[] args) {
  40         testCorrectBoxing();
  41         testIncorrectBoxing();
  42     }
  43 
  44     public static void testCorrectBoxing() {
  45         Class<?> vcc = ValueCapableClass.class;
  46         Class<?> dvt = ValueType.forClass(vcc).valueClass();
  47 
  48         MethodHandle newDvt = newDvtMh(dvt);
  49         MethodHandle box = boxMh(dvt, vcc);
  50         MethodHandle unbox = unboxMh(vcc, dvt);
  51 
  52         ValueCapableClass newObject = ValueCapableClass.create(3, (short)7, (short)11);
  53         ValueCapableClass newBoxed = null;
  54 
  55         try {
  56             ValueCapableClass boxed = (ValueCapableClass) MethodHandles.filterReturnValue(newDvt, box).invokeExact();
  57             // Assuming MVT1.0, where source has no way of holding an actual value at the language level, so: box(unbox(Object))
  58             newBoxed = (ValueCapableClass) MethodHandles.filterReturnValue(unbox, box).invokeExact(newObject);
  59         }
  60         catch (Throwable t) { fail("Invokation Exception", t); }
  61 
  62         assertTrue(newObject.getX() == newBoxed.getX());
  63         assertTrue(newObject.getY() == newBoxed.getY());
  64         assertTrue(newObject.getZ() == newBoxed.getZ());
  65     }
  66 
  67     public static void testIncorrectBoxing() {
  68         Class<?> vcc = ValueCapableClass.class;
  69         Class<?> dvt = ValueType.forClass(vcc).valueClass();
  70 
  71         MethodHandle newDvt = newDvtMh(dvt);
  72         MethodHandle box = boxMh(dvt, String.class); // Illegal box type
  73         try {
  74             MethodHandles.filterReturnValue(newDvt, box).invoke();
  75             fail("Expected ClassCastException");
  76         }
  77         catch (ClassCastException cce) {}
  78         catch (Throwable t) { fail("Invokation Exception", t); }
  79 
  80         // With -verify, this test will yield a VerifyError
  81         // since the constant pool entry at the index is not a
  82         // symbolic reference to a direct value class type.
  83         try {
  84             MethodHandle unbox = unboxMh(vcc, String.class); // Illegal unbox type
  85             unbox.invoke(ValueCapableClass.create());
  86             fail("Expected VerifyError");
  87         }
  88         catch (Throwable t) {
  89             if (!t.getMessage().contains("java.lang.VerifyError")) {
  90                 fail("Invokation Exception", t);
  91             }
  92         }
  93     }
  94 
  95     /*
  96        Create new DVT via loading a value array element. Why this workaround:
  97        1) to avoid "ValueType.defaultValueConstant()" which may or may not be implemented with vunbox
  98     */
  99     public static MethodHandle newDvtMh(Class<?> dvt) {
 100         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "newDvt", MethodType.methodType(dvt), CODE->{
 101                 CODE.iconst_1().anewarray(dvt).iconst_0().vaload().vreturn();
 102             });
 103     }
 104 
 105     public static MethodHandle boxMh(Class<?> inClass, Class<?> outClass) {
 106         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 107                 CODE.vload(0).vbox(outClass).areturn();
 108             });
 109     }
 110 
 111     public static MethodHandle unboxMh(Class<?> inClass, Class<?> outClass)  {
 112         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 113                 CODE.aload(0).vunbox(outClass).vreturn();
 114             });
 115     }
 116 
 117 }