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.
   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 
  24 /*
  25  * @test
  26  * @bug 8019184
  27  * @summary MethodHandles.catchException() fails when methods have 8 args + varargs
  28  */
  29 
  30 import java.util.*;
  31 import java.lang.invoke.*;
  32 
  33 public class TestCatchExceptionWithVarargs {
  34 
  35     private static final Class<?> CLASS = TestCatchExceptionWithVarargs.class;
  36     private static final int MAX_MH_ARITY = 254;
  37 
  38     public static MethodHandle target;
  39     public static MethodHandle handler;
  40 
  41     private static Object firstArg;
  42 
  43     static class MyException extends Exception {
  44     }
  45 
  46     public static Object target(Object... a) throws Exception {
  47         if (a[0] != firstArg) {
  48             throw new AssertionError("first argument different than expected: " + a[0] + " != " + firstArg);
  49         }
  50         throw new MyException();
  51     }
  52 
  53     public static Object handler(Object... a) {
  54         if (a[0] != firstArg) {
  55             throw new AssertionError("first argument different than expected: " + a[0] + " != " + firstArg);
  56         }
  57         return a[0];
  58     }
  59 
  60     static {
  61         try {
  62             MethodType mtype = MethodType.methodType(Object.class, Object[].class);
  63             target = MethodHandles.lookup().findStatic(CLASS, "target", mtype);
  64             handler = MethodHandles.lookup().findStatic(CLASS, "handler", mtype);
  65         } catch (Exception e) {
  66             throw new AssertionError(e);
  67         }
  68     }
  69 
  70     public static void main(String[] args) throws Throwable {
  71         List<Class<?>> ptypes = new LinkedList<>();
  72         ptypes.add(Object[].class);
  73 
  74         // We use MAX_MH_ARITY - 1 here to account for the Object[] argument.
  75         for (int i = 1; i < MAX_MH_ARITY - 1; i++) {
  76             ptypes.add(0, Object.class);
  77 
  78             MethodHandle targetWithArgs = target.asType(MethodType.methodType(Object.class, ptypes));
  79             MethodHandle handlerWithArgs = handler.asType(MethodType.methodType(Object.class, ptypes));
  80             handlerWithArgs = MethodHandles.dropArguments(handlerWithArgs, 0, MyException.class);
  81 
  82             MethodHandle gwc1 = MethodHandles.catchException(targetWithArgs, MyException.class, handlerWithArgs);
  83 
  84             // The next line throws an IllegalArgumentException if there is a bug.
  85             MethodHandle gwc2 = MethodHandles.catchException(gwc1, MyException.class, handlerWithArgs);
  86 
  87             // This is only to verify that the method handles can actually be invoked and do the right thing.
  88             firstArg = new Object();
  89             Object o = gwc2.asSpreader(Object[].class, ptypes.size() - 1).invoke(firstArg, new Object[i]);
  90             if (o != firstArg) {
  91                 throw new AssertionError("return value different than expected: " + o + " != " + firstArg);
  92             }
  93         }
  94     }
  95 }