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1 /* | 1 /* |
2 * Copyright (c) 2010 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2010 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #ifndef WEBRTC_AUDIO_DEVICE_LATEBINDINGSYMBOLTABLE_LINUX_H | 11 #ifndef WEBRTC_AUDIO_DEVICE_LATEBINDINGSYMBOLTABLE_LINUX_H |
12 #define WEBRTC_AUDIO_DEVICE_LATEBINDINGSYMBOLTABLE_LINUX_H | 12 #define WEBRTC_AUDIO_DEVICE_LATEBINDINGSYMBOLTABLE_LINUX_H |
13 | 13 |
14 #include <assert.h> | 14 #include <assert.h> |
15 #include <stddef.h> // for NULL | 15 #include <stddef.h> // for NULL |
16 #include <string.h> | 16 #include <string.h> |
17 | 17 |
18 #include "webrtc/base/constructormagic.h" | 18 #include "webrtc/base/constructormagic.h" |
19 | 19 |
20 // This file provides macros for creating "symbol table" classes to simplify the | 20 // This file provides macros for creating "symbol table" classes to simplify the |
21 // dynamic loading of symbols from DLLs. Currently the implementation only | 21 // dynamic loading of symbols from DLLs. Currently the implementation only |
22 // supports Linux and pure C symbols. | 22 // supports Linux and pure C symbols. |
23 // See talk/sound/pulseaudiosymboltable.(h|cc) for an example. | 23 // See talk/sound/pulseaudiosymboltable.(h|cc) for an example. |
24 | 24 |
25 namespace webrtc_adm_linux { | 25 namespace webrtc { |
| 26 namespace adm_linux { |
26 | 27 |
27 #ifdef WEBRTC_LINUX | 28 #ifdef WEBRTC_LINUX |
28 typedef void *DllHandle; | 29 typedef void *DllHandle; |
29 | 30 |
30 const DllHandle kInvalidDllHandle = NULL; | 31 const DllHandle kInvalidDllHandle = NULL; |
31 #else | 32 #else |
32 #error Not implemented | 33 #error Not implemented |
33 #endif | 34 #endif |
34 | 35 |
35 // These are helpers for use only by the class below. | 36 // These are helpers for use only by the class below. |
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125 | 126 |
126 // This macro must be invoked in the header declaration once for each symbol | 127 // This macro must be invoked in the header declaration once for each symbol |
127 // (recommended to use an X-Macro to avoid duplication). | 128 // (recommended to use an X-Macro to avoid duplication). |
128 // This macro defines an enum with names built from the symbols, which | 129 // This macro defines an enum with names built from the symbols, which |
129 // essentially creates a hash table in the compiler from symbol names to their | 130 // essentially creates a hash table in the compiler from symbol names to their |
130 // indices in the symbol table class. | 131 // indices in the symbol table class. |
131 #define LATE_BINDING_SYMBOL_TABLE_DECLARE_ENTRY(ClassName, sym) \ | 132 #define LATE_BINDING_SYMBOL_TABLE_DECLARE_ENTRY(ClassName, sym) \ |
132 ClassName##_SYMBOL_TABLE_INDEX_##sym, | 133 ClassName##_SYMBOL_TABLE_INDEX_##sym, |
133 | 134 |
134 // This macro completes the header declaration. | 135 // This macro completes the header declaration. |
135 #define LATE_BINDING_SYMBOL_TABLE_DECLARE_END(ClassName) \ | 136 #define LATE_BINDING_SYMBOL_TABLE_DECLARE_END(ClassName) \ |
136 ClassName##_SYMBOL_TABLE_SIZE \ | 137 ClassName##_SYMBOL_TABLE_SIZE \ |
137 }; \ | 138 } \ |
138 \ | 139 ; \ |
139 extern const char ClassName##_kDllName[]; \ | 140 \ |
140 extern const char *const \ | 141 extern const char ClassName##_kDllName[]; \ |
141 ClassName##_kSymbolNames[ClassName##_SYMBOL_TABLE_SIZE]; \ | 142 extern const char* const \ |
142 \ | 143 ClassName##_kSymbolNames[ClassName##_SYMBOL_TABLE_SIZE]; \ |
143 typedef ::webrtc_adm_linux::LateBindingSymbolTable<ClassName##_SYMBOL_TABLE_SIZE
, \ | 144 \ |
144 ClassName##_kDllName, \ | 145 typedef ::webrtc::adm_linux::LateBindingSymbolTable< \ |
145 ClassName##_kSymbolNames> \ | 146 ClassName##_SYMBOL_TABLE_SIZE, ClassName##_kDllName, \ |
146 ClassName; | 147 ClassName##_kSymbolNames> \ |
| 148 ClassName; |
147 | 149 |
148 // This macro must be invoked in a .cc file to define a previously-declared | 150 // This macro must be invoked in a .cc file to define a previously-declared |
149 // symbol table class. | 151 // symbol table class. |
150 #define LATE_BINDING_SYMBOL_TABLE_DEFINE_BEGIN(ClassName, dllName) \ | 152 #define LATE_BINDING_SYMBOL_TABLE_DEFINE_BEGIN(ClassName, dllName) \ |
151 const char ClassName##_kDllName[] = dllName; \ | 153 const char ClassName##_kDllName[] = dllName; \ |
152 const char *const ClassName##_kSymbolNames[ClassName##_SYMBOL_TABLE_SIZE] = { | 154 const char *const ClassName##_kSymbolNames[ClassName##_SYMBOL_TABLE_SIZE] = { |
153 | 155 |
154 // This macro must be invoked in the .cc definition once for each symbol | 156 // This macro must be invoked in the .cc definition once for each symbol |
155 // (recommended to use an X-Macro to avoid duplication). | 157 // (recommended to use an X-Macro to avoid duplication). |
156 // This would have to use the mangled name if we were to ever support C++ | 158 // This would have to use the mangled name if we were to ever support C++ |
157 // symbols. | 159 // symbols. |
158 #define LATE_BINDING_SYMBOL_TABLE_DEFINE_ENTRY(ClassName, sym) \ | 160 #define LATE_BINDING_SYMBOL_TABLE_DEFINE_ENTRY(ClassName, sym) \ |
159 #sym, | 161 #sym, |
160 | 162 |
161 #define LATE_BINDING_SYMBOL_TABLE_DEFINE_END(ClassName) \ | 163 #define LATE_BINDING_SYMBOL_TABLE_DEFINE_END(ClassName) \ |
162 }; | 164 }; |
163 | 165 |
164 // Index of a given symbol in the given symbol table class. | 166 // Index of a given symbol in the given symbol table class. |
165 #define LATESYM_INDEXOF(ClassName, sym) \ | 167 #define LATESYM_INDEXOF(ClassName, sym) \ |
166 (ClassName##_SYMBOL_TABLE_INDEX_##sym) | 168 (ClassName##_SYMBOL_TABLE_INDEX_##sym) |
167 | 169 |
168 // Returns a reference to the given late-binded symbol, with the correct type. | 170 // Returns a reference to the given late-binded symbol, with the correct type. |
169 #define LATESYM_GET(ClassName, inst, sym) \ | 171 #define LATESYM_GET(ClassName, inst, sym) \ |
170 (*reinterpret_cast<typeof(&sym)>( \ | 172 (*reinterpret_cast<typeof(&sym)>( \ |
171 (inst)->GetSymbol(LATESYM_INDEXOF(ClassName, sym)))) | 173 (inst)->GetSymbol(LATESYM_INDEXOF(ClassName, sym)))) |
172 | 174 |
173 } // namespace webrtc_adm_linux | 175 } // namespace adm_linux |
| 176 } // namespace webrtc |
174 | 177 |
175 #endif // WEBRTC_ADM_LATEBINDINGSYMBOLTABLE_LINUX_H | 178 #endif // WEBRTC_ADM_LATEBINDINGSYMBOLTABLE_LINUX_H |
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