71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
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/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_
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#define WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_
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#include <string.h>
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#include "webrtc/base/common.h"
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#include "webrtc/base/constructormagic.h"
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namespace rtc {
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#if defined(WEBRTC_POSIX)
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typedef void *DllHandle;
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#else
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#error Not implemented for this platform
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#endif
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// This is the base class for "symbol table" classes to simplify the dynamic
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// loading of symbols from DLLs. Currently the implementation only supports
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// Linux and OS X, and pure C symbols (or extern "C" symbols that wrap C++
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// functions). Sub-classes for specific DLLs are generated via the "supermacro"
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// files latebindingsymboltable.h.def and latebindingsymboltable.cc.def. See
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// talk/sound/pulseaudiosymboltable.(h|cc) for an example.
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class LateBindingSymbolTable {
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public:
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struct TableInfo {
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const char *dll_name;
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int num_symbols;
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// Array of size num_symbols.
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const char *const *symbol_names;
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};
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LateBindingSymbolTable(const TableInfo *info, void **table);
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~LateBindingSymbolTable();
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bool IsLoaded() const;
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// Loads the DLL and the symbol table. Returns true iff the DLL and symbol
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// table loaded successfully.
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bool Load();
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// Like load, but allows overriding the dll path for when the dll path is
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// dynamic.
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bool LoadFromPath(const char *dll_path);
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void Unload();
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// Gets the raw OS handle to the DLL. Be careful what you do with it.
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DllHandle GetDllHandle() const { return handle_; }
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private:
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void ClearSymbols();
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const TableInfo *info_;
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void **table_;
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DllHandle handle_;
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bool undefined_symbols_;
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RTC_DISALLOW_COPY_AND_ASSIGN(LateBindingSymbolTable);
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};
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} // namespace rtc
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#endif // WEBRTC_BASE_LATEBINDINGSYMBOLTABLE_H_
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