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
26package jdk.internal.reflect;
27
28import java.lang.reflect.*;
29import sun.reflect.misc.ReflectUtil;
30
31/** Used only for the first few invocations of a Method; afterward,
32    switches to bytecode-based implementation */
33
34class 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}
71