mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-07 12:07:17 +00:00
84b7df43fb
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50695 91177308-0d34-0410-b5e6-96231b3b80d8
99 lines
4.0 KiB
C++
99 lines
4.0 KiB
C++
//===-- llvm/System/DynamicLibrary.h - Portable Dynamic Library -*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares the sys::DynamicLibrary class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SYSTEM_DYNAMIC_LIBRARY_H
|
|
#define LLVM_SYSTEM_DYNAMIC_LIBRARY_H
|
|
|
|
#include "llvm/System/Path.h"
|
|
#include <string>
|
|
|
|
namespace llvm {
|
|
namespace sys {
|
|
|
|
/// This class provides a portable interface to dynamic libraries which also
|
|
/// might be known as shared libraries, shared objects, dynamic shared
|
|
/// objects, or dynamic link libraries. Regardless of the terminology or the
|
|
/// operating system interface, this class provides a portable interface that
|
|
/// allows dynamic libraries to be loaded and and searched for externally
|
|
/// defined symbols. This is typically used to provide "plug-in" support.
|
|
/// It also allows for symbols to be defined which don't live in any library,
|
|
/// but rather the main program itself, useful on Windows where the main
|
|
/// executable cannot be searched.
|
|
class DynamicLibrary {
|
|
/// @name Constructors
|
|
/// @{
|
|
public:
|
|
/// Construct a DynamicLibrary that represents the currently executing
|
|
/// program. The program must have been linked with -export-dynamic or
|
|
/// -dlopen self for this to work.
|
|
/// @throws std::string indicating why the program couldn't be opened.
|
|
/// @brief Open program as dynamic library.
|
|
DynamicLibrary();
|
|
|
|
/// After destruction, the symbols of the library will no longer be
|
|
/// available to the program.
|
|
/// @brief Closes the DynamicLibrary
|
|
~DynamicLibrary();
|
|
|
|
/// @}
|
|
/// @name Functions
|
|
/// @{
|
|
public:
|
|
/// This function allows a library to be loaded without instantiating a
|
|
/// DynamicLibrary object. Consequently, it is marked as being permanent
|
|
/// and will only be unloaded when the program terminates. This returns
|
|
/// false on success or returns true and fills in *ErrMsg on failure.
|
|
/// @brief Open a dynamic library permanently.
|
|
static bool LoadLibraryPermanently(const char* filename,
|
|
std::string *ErrMsg = 0);
|
|
|
|
/// This function will search through all previously loaded dynamic
|
|
/// libraries for the symbol \p symbolName. If it is found, the addressof
|
|
/// that symbol is returned. If not, null is returned. Note that this will
|
|
/// search permanently loaded libraries (LoadLibraryPermanently) as well
|
|
/// as ephemerally loaded libraries (constructors).
|
|
/// @throws std::string on error.
|
|
/// @brief Search through libraries for address of a symbol
|
|
static void* SearchForAddressOfSymbol(const char* symbolName);
|
|
|
|
/// @brief Convenience function for C++ophiles.
|
|
static void* SearchForAddressOfSymbol(const std::string& symbolName) {
|
|
return SearchForAddressOfSymbol(symbolName.c_str());
|
|
}
|
|
|
|
/// This functions permanently adds the symbol \p symbolName with the
|
|
/// value \p symbolValue. These symbols are searched before any
|
|
/// libraries.
|
|
/// @brief Add searchable symbol/value pair.
|
|
static void AddSymbol(const char* symbolName, void *symbolValue);
|
|
|
|
/// @brief Convenience function for C++ophiles.
|
|
static void AddSymbol(const std::string& symbolName, void *symbolValue) {
|
|
AddSymbol(symbolName.c_str(), symbolValue);
|
|
}
|
|
|
|
/// @}
|
|
/// @name Implementation
|
|
/// @{
|
|
protected:
|
|
void* handle; // Opaque handle for information about the library
|
|
DynamicLibrary(const DynamicLibrary&); ///< Do not implement
|
|
DynamicLibrary& operator=(const DynamicLibrary&); ///< Do not implement
|
|
/// @}
|
|
};
|
|
|
|
} // End sys namespace
|
|
} // End llvm namespace
|
|
|
|
#endif // LLVM_SYSTEM_DYNAMIC_LIBRARY_H
|