henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #ifndef WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_ |
| 12 | #define WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_ |
| 13 | |
| 14 | #include <string.h> |
| 15 | |
| 16 | #include "webrtc/base/common.h" |
| 17 | |
| 18 | namespace rtc { |
| 19 | |
| 20 | #if defined(WEBRTC_POSIX) |
| 21 | typedef void *DllHandle; |
| 22 | #else |
| 23 | #error Not implemented for this platform |
| 24 | #endif |
| 25 | |
| 26 | // This is the base class for "symbol table" classes to simplify the dynamic |
| 27 | // loading of symbols from DLLs. Currently the implementation only supports |
| 28 | // Linux and OS X, and pure C symbols (or extern "C" symbols that wrap C++ |
| 29 | // functions). Sub-classes for specific DLLs are generated via the "supermacro" |
| 30 | // files latebindingsymboltable.h.def and latebindingsymboltable.cc.def. See |
| 31 | // talk/sound/pulseaudiosymboltable.(h|cc) for an example. |
| 32 | class LateBindingSymbolTable { |
| 33 | public: |
| 34 | struct TableInfo { |
| 35 | const char *dll_name; |
| 36 | int num_symbols; |
| 37 | // Array of size num_symbols. |
| 38 | const char *const *symbol_names; |
| 39 | }; |
| 40 | |
| 41 | LateBindingSymbolTable(const TableInfo *info, void **table); |
| 42 | ~LateBindingSymbolTable(); |
| 43 | |
| 44 | bool IsLoaded() const; |
| 45 | // Loads the DLL and the symbol table. Returns true iff the DLL and symbol |
| 46 | // table loaded successfully. |
| 47 | bool Load(); |
| 48 | // Like load, but allows overriding the dll path for when the dll path is |
| 49 | // dynamic. |
| 50 | bool LoadFromPath(const char *dll_path); |
| 51 | void Unload(); |
| 52 | |
| 53 | // Gets the raw OS handle to the DLL. Be careful what you do with it. |
| 54 | DllHandle GetDllHandle() const { return handle_; } |
| 55 | |
| 56 | private: |
| 57 | void ClearSymbols(); |
| 58 | |
| 59 | const TableInfo *info_; |
| 60 | void **table_; |
| 61 | DllHandle handle_; |
| 62 | bool undefined_symbols_; |
| 63 | |
| 64 | DISALLOW_COPY_AND_ASSIGN(LateBindingSymbolTable); |
| 65 | }; |
| 66 | |
| 67 | } // namespace rtc |
| 68 | |
| 69 | #endif // WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_ |