1 /*
   2  * Copyright (c) 2013, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 /*
  27  * @test
  28  * @bug 8019184
  29  * @summary MethodHandles.catchException() fails when methods have 8 args + varargs
  30  */
  31 
  32 import java.util.*;
  33 import java.lang.invoke.*;
  34 
  35 public class TestCatchExceptionWithVarargs {
  36 
  37     private static final Class<?> CLASS = TestCatchExceptionWithVarargs.class;
  38     private static final int MAX_MH_ARITY = 254;
  39 
  40     public static MethodHandle target;
  41     public static MethodHandle handler;
  42 
  43     private static Object firstArg;
  44 
  45     static class MyException extends Exception {
  46     }
  47 
  48     public static Object target(Object... a) throws Exception {
  49         if (a[0] != firstArg) {
  50             throw new AssertionError("first argument different than expected: " + a[0] + " != " + firstArg);
  51         }
  52         throw new MyException();
  53     }
  54 
  55     public static Object handler(Object... a) {
  56         if (a[0] != firstArg) {
  57             throw new AssertionError("first argument different than expected: " + a[0] + " != " + firstArg);
  58         }
  59         return a[0];
  60     }
  61 
  62     static {
  63         try {
  64             MethodType mtype = MethodType.methodType(Object.class, Object[].class);
  65             target = MethodHandles.lookup().findStatic(CLASS, "target", mtype);
  66             handler = MethodHandles.lookup().findStatic(CLASS, "handler", mtype);
  67         } catch (Exception e) {
  68             throw new AssertionError(e);
  69         }
  70     }
  71 
  72     public static void main(String[] args) throws Throwable {
  73         List<Class<?>> ptypes = new LinkedList<>();
  74         ptypes.add(Object[].class);
  75 
  76         // We use MAX_MH_ARITY - 1 here to account for the Object[] argument.
  77         for (int i = 1; i < MAX_MH_ARITY - 1; i++) {
  78             ptypes.add(0, Object.class);
  79 
  80             MethodHandle targetWithArgs = target.asType(MethodType.methodType(Object.class, ptypes));
  81             MethodHandle handlerWithArgs = handler.asType(MethodType.methodType(Object.class, ptypes));
  82             handlerWithArgs = MethodHandles.dropArguments(handlerWithArgs, 0, MyException.class);
  83 
  84             MethodHandle gwc1 = MethodHandles.catchException(targetWithArgs, MyException.class, handlerWithArgs);
  85 
  86             // The next line throws an IllegalArgumentException if there is a bug.
  87             MethodHandle gwc2 = MethodHandles.catchException(gwc1, MyException.class, handlerWithArgs);
  88 
  89             // This is only to verify that the method handles can actually be invoked and do the right thing.
  90             firstArg = new Object();
  91             Object o = gwc2.asSpreader(Object[].class, ptypes.size() - 1).invoke(firstArg, new Object[i]);
  92             if (o != firstArg) {
  93                 throw new AssertionError("return value different than expected: " + o + " != " + firstArg);
  94             }
  95         }
  96     }
  97 }