1 /*
   2  * Copyright (c) 2013, 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 
  24 /*
  25  * @test
  26  * @bug 8019184
  27  * @library /lib/testlibrary /java/lang/invoke/common
  28  * @summary MethodHandles.catchException() fails when methods have 8 args + varargs
  29  * @run main TestCatchExceptionWithVarargs
  30  */
  31 
  32 import test.java.lang.invoke.lib.CodeCacheOverflowProcessor;
  33 
  34 import java.lang.invoke.MethodHandle;
  35 import java.lang.invoke.MethodHandles;
  36 import java.lang.invoke.MethodType;
  37 import java.util.LinkedList;
  38 import java.util.List;
  39 
  40 public class TestCatchExceptionWithVarargs {
  41 
  42     private static final Class<?> CLASS = TestCatchExceptionWithVarargs.class;
  43     private static final int MAX_MH_ARITY = 254;
  44 
  45     public static MethodHandle target;
  46     public static MethodHandle handler;
  47 
  48     private static Object firstArg;
  49 
  50     static class MyException extends Exception {
  51     }
  52 
  53     public static Object target(Object... a) throws Exception {
  54         if (a[0] != firstArg) {
  55             throw new AssertionError("first argument different than expected: "
  56                     + a[0] + " != " + firstArg);
  57         }
  58         throw new MyException();
  59     }
  60 
  61     public static Object handler(Object... a) {
  62         if (a[0] != firstArg) {
  63             throw new AssertionError("first argument different than expected: "
  64                     + a[0] + " != " + firstArg);
  65         }
  66         return a[0];
  67     }
  68 
  69     static {
  70         try {
  71             MethodType mtype = MethodType.methodType(Object.class, Object[].class);
  72             target = MethodHandles.lookup().findStatic(CLASS, "target", mtype);
  73             handler = MethodHandles.lookup().findStatic(CLASS, "handler", mtype);
  74         } catch (Exception e) {
  75             throw new AssertionError(e);
  76         }
  77     }
  78 
  79     public static void main(String[] args) throws Throwable {
  80         CodeCacheOverflowProcessor
  81                 .runMHTest(TestCatchExceptionWithVarargs::test);
  82     }
  83 
  84     public static void test() throws Throwable {
  85         List<Class<?>> ptypes = new LinkedList<>();
  86         ptypes.add(Object[].class);
  87 
  88         // We use MAX_MH_ARITY - 1 here to account for the Object[] argument.
  89         for (int i = 1; i < MAX_MH_ARITY - 1; i++) {
  90             ptypes.add(0, Object.class);
  91 
  92             MethodHandle targetWithArgs = target.asType(
  93                     MethodType.methodType(Object.class, ptypes));
  94             MethodHandle handlerWithArgs = handler.asType(
  95                     MethodType.methodType(Object.class, ptypes));
  96             handlerWithArgs = MethodHandles.dropArguments(
  97                     handlerWithArgs, 0, MyException.class);
  98 
  99             MethodHandle gwc1 = MethodHandles.catchException(
 100                     targetWithArgs, MyException.class, handlerWithArgs);
 101 
 102             // The next line throws an IllegalArgumentException if there is a bug.
 103             MethodHandle gwc2 = MethodHandles.catchException(
 104                     gwc1, MyException.class, handlerWithArgs);
 105 
 106             // This is only to verify that the method handles can actually be invoked and do the right thing.
 107             firstArg = new Object();
 108             Object o = gwc2.asSpreader(Object[].class, ptypes.size() - 1)
 109                            .invoke(firstArg, new Object[i]);
 110             if (o != firstArg) {
 111                 throw new AssertionError("return value different than expected: "
 112                         + o + " != " + firstArg);
 113             }
 114         }
 115     }
 116 }