1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef JNI_INVOCATION_H_included
#define JNI_INVOCATION_H_included
#include <jni.h>
// JniInvocation adds a layer of indirection for applications using
// the JNI invocation API to allow the JNI implementation to be
// selected dynamically. Apps can specify a specific implementation to
// be used by calling InitJniInvocation. If this is not done, the
// library will chosen based on the value of Android system property
// persist.sys.dalvik.vm.lib on the device, and otherwise fall back to
// a hard-coded default implementation.
class JniInvocation {
public:
JniInvocation();
~JniInvocation();
// Initialize JNI invocation API. library should specifiy a valid
// shared library for opening via dlopen providing a JNI invocation
// implementation, or null to allow defaulting via
// persist.sys.dalvik.vm.lib.
bool Init(const char* library);
// Exposes which library is actually loaded from the given name. The
// buffer of size PROPERTY_VALUE_MAX will be used to load the system
// property for the default library, if necessary. If no buffer is
// provided, the fallback value will be used.
static const char* GetLibrary(const char* library, char* buffer);
private:
bool FindSymbol(void** pointer, const char* symbol);
static JniInvocation& GetJniInvocation();
jint JNI_GetDefaultJavaVMInitArgs(void* vmargs);
jint JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args);
jint JNI_GetCreatedJavaVMs(JavaVM** vms, jsize size, jsize* vm_count);
static JniInvocation* jni_invocation_;
void* handle_;
jint (*JNI_GetDefaultJavaVMInitArgs_)(void*);
jint (*JNI_CreateJavaVM_)(JavaVM**, JNIEnv**, void*);
jint (*JNI_GetCreatedJavaVMs_)(JavaVM**, jsize, jsize*);
friend jint JNI_GetDefaultJavaVMInitArgs(void* vm_args);
friend jint JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args);
friend jint JNI_GetCreatedJavaVMs(JavaVM** vms, jsize size, jsize* vm_count);
};
#endif // JNI_INVOCATION_H_included
|
