1 //===-- llvm/System/DynamicLibrary.h - Portable Dynamic Library -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Reid Spencer and is distributed under the
6 // University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the sys::DynamicLibrary class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_SYSTEM_DYNAMIC_LIBRARY_H
15 #define LLVM_SYSTEM_DYNAMIC_LIBRARY_H
17 #include "llvm/System/Path.h"
23 /// This class provides a portable interface to dynamic libraries which also
24 /// might be known as shared libraries, shared objects, dynamic shared
25 /// objects, or dynamic link libraries. Regardless of the terminology or the
26 /// operating system interface, this class provides a portable interface that
27 /// allows dynamic libraries to be loaded and and searched for externally
28 /// defined symbols. This is typically used to provide "plug-in" support.
30 /// @brief Portable dynamic library abstraction.
31 class DynamicLibrary {
32 /// @name Constructors
35 /// This is the constructor for DynamicLibrary instances. It will open
36 /// the dynamic library specified by the \filename Path.
37 /// @throws std::string indicating why the library couldn't be opened.
38 /// @brief DynamicLibrary constructor
39 DynamicLibrary(const char* filename);
41 /// After destruction, the symbols of the library will no longer be
42 /// available to the program. It is important to make sure the lifespan
43 /// of a DynamicLibrary exceeds the lifetime of the pointers returned
44 /// by the GetAddressOfSymbol otherwise the program may walk off into
45 /// uncharted territory.
46 /// @see GetAddressOfSymbol.
47 /// @brief Closes the DynamicLibrary
54 /// Looks up a \p symbolName in the DynamicLibrary and returns its address
55 /// if it exists. If the symbol does not exist, returns (void*)0.
56 /// @returns the address of the symbol or 0.
57 /// @brief Get the address of a symbol in the DynamicLibrary.
58 void* GetAddressOfSymbol(const char* symbolName);
60 /// @brief Convenience function for C++ophiles.
61 void* GetAddressOfSymbol(const std::string& symbolName) {
62 return GetAddressOfSymbol(symbolName.c_str());
66 /// @name Implementation
69 void* handle; // Opaque handle for information about the library
71 DynamicLibrary(); ///< Do not implement
72 DynamicLibrary(const DynamicLibrary&); ///< Do not implement
73 DynamicLibrary& operator=(const DynamicLibrary&); ///< Do not implement
77 } // End sys namespace
78 } // End llvm namespace
80 #endif // LLVM_SYSTEM_DYNAMIC_LIBRARY_H