1 /*

     2  * Copyright (c) 2001, 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 package sun.reflect;

    27 

    28 import java.lang.reflect.*;

    29 import sun.reflect.misc.ReflectUtil;

    30 

    31 /** Used only for the first few invocations of a Method; afterward,

    32     switches to bytecode-based implementation */

    33 

    34 class NativeMethodAccessorImpl extends MethodAccessorImpl {

    35     private final Method method;

    36     private DelegatingMethodAccessorImpl parent;

    37     private int numInvocations;

    38 

    39     NativeMethodAccessorImpl(Method method) {

    40         this.method = method;

    41     }

    42 

    43     public Object invoke(Object obj, Object[] args)

    44         throws IllegalArgumentException, InvocationTargetException

    45     {

    46         // We can't inflate methods belonging to vm-anonymous classes because

    47         // that kind of class can't be referred to by name, hence can't be

    48         // found from the generated bytecode.

    49         if (++numInvocations > ReflectionFactory.inflationThreshold()

    50                 && !ReflectUtil.isVMAnonymousClass(method.getDeclaringClass())) {

    51             MethodAccessorImpl acc = (MethodAccessorImpl)

    52                 new MethodAccessorGenerator().

    53                     generateMethod(method.getDeclaringClass(),

    54                                    method.getName(),

    55                                    method.getParameterTypes(),

    56                                    method.getReturnType(),

    57                                    method.getExceptionTypes(),

    58                                    method.getModifiers());

    59             parent.setDelegate(acc);

    60         }

    61 

    62         return invoke0(method, obj, args);

    63     }

    64 

    65     void setParent(DelegatingMethodAccessorImpl parent) {

    66         this.parent = parent;

    67     }

    68 

    69     private static native Object invoke0(Method m, Object obj, Object[] args);

    70 }