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