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.incubator.mvt.ValueType;
  27 import jdk.experimental.value.MethodHandleBuilder;
  28 
  29 import static jdk.test.lib.Asserts.*;
  30 
  31 /*
  32  * @test VunboxErrorIndex
  33  * @summary Exercise the verifier for vunbox bytecode with a non-value type CP index.
  34  * @modules java.base/jdk.experimental.value
  35  *          jdk.incubator.mvt
  36  * @library /test/lib
  37  * @build runtime.valhalla.valuetypes.verifier.ValueCapableClass
  38  * @run main/othervm -Xint -verify -XX:+EnableMVT runtime.valhalla.valuetypes.verifier.VunboxErrorIndex
  39  */
  40 public class VunboxErrorIndex {
  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         // With -verify, this test will yield a VerifyError
  84         // since the constant pool entry at the index is not a
  85         // symbolic reference to a direct value class type.
  86         try {
  87             MethodHandle unbox = unboxMh(vcc, String.class); // Illegal unbox type
  88             unbox.invoke(ValueCapableClass.create());
  89             fail("Expected VerifyError");
  90         }
  91         catch (Throwable t) {
  92             if (!t.getMessage().contains("java.lang.VerifyError")) {
  93                 fail("Invokation Exception", t);
  94             }
  95         }
  96     }
  97 
  98     /*
  99        Create new DVT via loading a value array element. Why this workaround:
 100        1) to avoid "ValueType.defaultValueConstant()" which may or may not be implemented with vunbox
 101     */
 102     public static MethodHandle newDvtMh(Class<?> dvt) {
 103         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "newDvt", MethodType.methodType(dvt), CODE->{
 104                 CODE.iconst_1().anewarray(dvt).iconst_0().vaload().vreturn();
 105             });
 106     }
 107 
 108     public static MethodHandle boxMh(Class<?> inClass, Class<?> outClass) {
 109         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 110                 CODE.vload(0).vbox(outClass).areturn();
 111             });
 112     }
 113 
 114     public static MethodHandle unboxMh(Class<?> inClass, Class<?> outClass)  {
 115         return MethodHandleBuilder.loadCode(MethodHandles.lookup(), "box", MethodType.methodType(outClass, inClass), CODE->{
 116                 CODE.aload(0).vunbox(outClass).vreturn();
 117             });
 118     }
 119 
 120 }