henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2004--2010, Google Inc. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 19 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #ifndef TALK_BASE_LATEBINDINGSYMBOLTABLE_H_ |
| 29 | #define TALK_BASE_LATEBINDINGSYMBOLTABLE_H_ |
| 30 | |
| 31 | #include <string.h> |
| 32 | |
| 33 | #include "talk/base/common.h" |
| 34 | |
| 35 | namespace talk_base { |
| 36 | |
| 37 | #ifdef POSIX |
| 38 | typedef void *DllHandle; |
| 39 | #else |
| 40 | #error Not implemented for this platform |
| 41 | #endif |
| 42 | |
| 43 | // This is the base class for "symbol table" classes to simplify the dynamic |
| 44 | // loading of symbols from DLLs. Currently the implementation only supports |
| 45 | // Linux and OS X, and pure C symbols (or extern "C" symbols that wrap C++ |
| 46 | // functions). Sub-classes for specific DLLs are generated via the "supermacro" |
| 47 | // files latebindingsymboltable.h.def and latebindingsymboltable.cc.def. See |
| 48 | // talk/sound/pulseaudiosymboltable.(h|cc) for an example. |
| 49 | class LateBindingSymbolTable { |
| 50 | public: |
| 51 | struct TableInfo { |
| 52 | const char *dll_name; |
| 53 | int num_symbols; |
| 54 | // Array of size num_symbols. |
| 55 | const char *const *symbol_names; |
| 56 | }; |
| 57 | |
| 58 | LateBindingSymbolTable(const TableInfo *info, void **table); |
| 59 | ~LateBindingSymbolTable(); |
| 60 | |
| 61 | bool IsLoaded() const; |
| 62 | // Loads the DLL and the symbol table. Returns true iff the DLL and symbol |
| 63 | // table loaded successfully. |
| 64 | bool Load(); |
| 65 | // Like load, but allows overriding the dll path for when the dll path is |
| 66 | // dynamic. |
| 67 | bool LoadFromPath(const char *dll_path); |
| 68 | void Unload(); |
| 69 | |
wu@webrtc.org | 861d073 | 2013-10-07 23:32:02 +0000 | [diff] [blame] | 70 | // Gets the raw OS handle to the DLL. Be careful what you do with it. |
| 71 | DllHandle GetDllHandle() const { return handle_; } |
| 72 | |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 73 | private: |
| 74 | void ClearSymbols(); |
| 75 | |
| 76 | const TableInfo *info_; |
| 77 | void **table_; |
| 78 | DllHandle handle_; |
| 79 | bool undefined_symbols_; |
| 80 | |
| 81 | DISALLOW_COPY_AND_ASSIGN(LateBindingSymbolTable); |
| 82 | }; |
| 83 | |
| 84 | } // namespace talk_base |
| 85 | |
| 86 | #endif // TALK_BASE_LATEBINDINGSYMBOLTABLE_H_ |