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1 /* Copyright (C) 2017 The Android Open Source Project
2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3  *
4  * This file implements interfaces from the file jvmti.h. This implementation
5  * is licensed under the same terms as the file jvmti.h.  The
6  * copyright and license information for the file jvmti.h follows.
7  *
8  * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
9  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
10  *
11  * This code is free software; you can redistribute it and/or modify it
12  * under the terms of the GNU General Public License version 2 only, as
13  * published by the Free Software Foundation.  Oracle designates this
14  * particular file as subject to the "Classpath" exception as provided
15  * by Oracle in the LICENSE file that accompanied this code.
16  *
17  * This code is distributed in the hope that it will be useful, but WITHOUT
18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
20  * version 2 for more details (a copy is included in the LICENSE file that
21  * accompanied this code).
22  *
23  * You should have received a copy of the GNU General Public License version
24  * 2 along with this work; if not, write to the Free Software Foundation,
25  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
26  *
27  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
28  * or visit www.oracle.com if you need additional information or have any
29  * questions.
30  */
31 
32 #ifndef ART_OPENJDKJVMTI_TI_JNI_H_
33 #define ART_OPENJDKJVMTI_TI_JNI_H_
34 
35 #include "jni.h"
36 #include "jvmti.h"
37 
38 namespace openjdkjvmti {
39 
40 // Note: Currently, JNI function table changes are sensitive to the order of operations wrt/
41 //       CheckJNI. If an agent sets the function table, and a program than late-enables CheckJNI,
42 //       CheckJNI will not be working (as the agent will forward to the non-CheckJNI table).
43 //
44 //       This behavior results from our usage of the function table to avoid a check of the
45 //       CheckJNI flag. A future implementation may install on loading of this plugin an
46 //       intermediate function table that explicitly checks the flag, so that switching CheckJNI
47 //       is transparently handled.
48 
49 class JNIUtil {
50  public:
51   static jvmtiError SetJNIFunctionTable(jvmtiEnv* env, const jniNativeInterface* function_table);
52 
53   static jvmtiError GetJNIFunctionTable(jvmtiEnv* env, jniNativeInterface** function_table);
54 };
55 
56 }  // namespace openjdkjvmti
57 
58 #endif  // ART_OPENJDKJVMTI_TI_JNI_H_
59