1/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15#ifndef TENSORFLOW_LITE_SHARED_LIBRARY_H_
16#define TENSORFLOW_LITE_SHARED_LIBRARY_H_
17
18#if defined(_WIN32)
19// Windows does not have dlfcn.h/dlsym, use GetProcAddress() instead.
20#include <windows.h>
21#else
22#include <dlfcn.h>
23#endif // defined(_WIN32)
24
25namespace tflite {
26
27// SharedLibrary provides a uniform set of APIs across different platforms to
28// handle dynamic library operations
29class SharedLibrary {
30 public:
31#if defined(_WIN32)
32 static inline void* LoadLibrary(const wchar_t* lib) {
33 return ::LoadLibraryW(lib);
34 }
35 static inline void* GetLibrarySymbol(void* handle, const char* symbol) {
36 return reinterpret_cast<void*>(
37 GetProcAddress(static_cast<HMODULE>(handle), symbol));
38 }
39 // Warning: Unlike dlsym(RTLD_DEFAULT), it doesn't search the symbol from
40 // dependent DLLs.
41 static inline void* GetSymbol(const char* symbol) {
42 return reinterpret_cast<void*>(GetProcAddress(nullptr, symbol));
43 }
44 static inline int UnLoadLibrary(void* handle) {
45 return FreeLibrary(static_cast<HMODULE>(handle));
46 }
47 static inline const char* GetError() { return "Unknown"; }
48#else
49 static inline void* LoadLibrary(const char* lib) {
50 return dlopen(lib, RTLD_LAZY | RTLD_LOCAL);
51 }
52 static inline void* GetLibrarySymbol(void* handle, const char* symbol) {
53 return dlsym(handle, symbol);
54 }
55 static inline void* GetSymbol(const char* symbol) {
56 return dlsym(RTLD_DEFAULT, symbol);
57 }
58 static inline int UnLoadLibrary(void* handle) { return dlclose(handle); }
59 static inline const char* GetError() { return dlerror(); }
60#endif // defined(_WIN32)
61};
62
63} // namespace tflite
64
65#endif // TENSORFLOW_LITE_SHARED_LIBRARY_H_
66