henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2012, 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 | // This file is a supermacro |
| 29 | // (see http://wanderinghorse.net/computing/papers/supermacros_cpp.html) to |
| 30 | // expand a declaration of a late-binding symbol table class. |
| 31 | // |
| 32 | // Arguments: |
| 33 | // LATE_BINDING_SYMBOL_TABLE_CLASS_NAME: Name of the class to generate. |
| 34 | // LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST: List of symbols to load from the DLL, |
| 35 | // as an X-Macro list (see http://www.drdobbs.com/blogs/cpp/228700289). |
| 36 | // |
| 37 | // From a .h file, include the header(s) for the DLL to late-bind and the |
| 38 | // latebindingsymboltable.h header, and then call this supermacro (optionally |
| 39 | // from inside the namespace for the class to generate, if any). Example: |
| 40 | // |
| 41 | // #include <headerfordll.h> |
| 42 | // |
| 43 | // #include "talk/base/latebindingsymboltable.h" |
| 44 | // |
| 45 | // namespace foo { |
| 46 | // |
| 47 | // #define MY_CLASS_NAME DesiredClassName |
| 48 | // #define MY_SYMBOLS_LIST X(acos) X(sin) X(tan) |
| 49 | // |
| 50 | // #define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME MY_CLASS_NAME |
| 51 | // #define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST MY_SYMBOLS_LIST |
| 52 | // #include "talk/base/latebindingsymboltable.h.def" |
| 53 | // |
| 54 | // } |
| 55 | |
| 56 | #ifndef TALK_BASE_LATEBINDINGSYMBOLTABLE_H_ |
| 57 | #error You must first include latebindingsymboltable.h |
| 58 | #endif |
| 59 | |
| 60 | #ifndef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME |
| 61 | #error You must define LATE_BINDING_SYMBOL_TABLE_CLASS_NAME |
| 62 | #endif |
| 63 | |
| 64 | #ifndef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST |
| 65 | #error You must define LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST |
| 66 | #endif |
| 67 | |
| 68 | class LATE_BINDING_SYMBOL_TABLE_CLASS_NAME : |
| 69 | public ::talk_base::LateBindingSymbolTable { |
| 70 | public: |
| 71 | LATE_BINDING_SYMBOL_TABLE_CLASS_NAME(); |
| 72 | ~LATE_BINDING_SYMBOL_TABLE_CLASS_NAME(); |
| 73 | |
| 74 | #define X(sym) \ |
| 75 | typeof(&::sym) sym() const { \ |
| 76 | ASSERT(::talk_base::LateBindingSymbolTable::IsLoaded()); \ |
| 77 | return reinterpret_cast<typeof(&::sym)>(table_[SYMBOL_TABLE_INDEX_##sym]); \ |
| 78 | } |
| 79 | LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST |
| 80 | #undef X |
| 81 | |
| 82 | private: |
| 83 | enum { |
| 84 | #define X(sym) \ |
| 85 | SYMBOL_TABLE_INDEX_##sym, |
| 86 | LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST |
| 87 | #undef X |
| 88 | SYMBOL_TABLE_SIZE |
| 89 | }; |
| 90 | |
| 91 | static const ::talk_base::LateBindingSymbolTable::TableInfo kTableInfo; |
henrike@webrtc.org | c80268d | 2014-04-08 22:13:01 +0000 | [diff] [blame] | 92 | static const char *const kSymbolNames[]; |
henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 93 | |
| 94 | void *table_[SYMBOL_TABLE_SIZE]; |
| 95 | |
| 96 | DISALLOW_COPY_AND_ASSIGN(LATE_BINDING_SYMBOL_TABLE_CLASS_NAME); |
| 97 | }; |
| 98 | |
| 99 | #undef LATE_BINDING_SYMBOL_TABLE_CLASS_NAME |
| 100 | #undef LATE_BINDING_SYMBOL_TABLE_SYMBOLS_LIST |