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/** @file
* IPRT - Lazy share library linking (2nd try).
*/
/*
* Copyright (C) 2013-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_ldrlazy_h
#define IPRT_INCLUDED_ldrlazy_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/ldr.h>
/** @defgroup grp_rt_ldrlazy RTLdrLazy - Lazy shared library linking.
* @ingroup grp_rt
*
* This is a set of macros which will produce code for dynamically loading and
* resolving symbols in shared libraries (DLLs).
*
* There is an assembly language alternative to this that only requires writing
* a list of symbols in a format similar to what the microsoft linkers take as
* input when producing DLLs and import libraries. That is probably preferable
* over this code. See src/bldprog/VBoxDef2LazyLoad.cpp.
*
* @{
*/
/**
* Defines a module for use in lazy resolving.
*
* @param a_Mod The module name (C name).
* @param a_pszFile The file to tell RTLdrLoad to load.
*/
#define RTLDRLAZY_MODULE(a_Mod, a_pszFile) \
RTLDRLAZY_MODULE_EX(a_Mod, a_pszFile, RTLdrLoad)
/**
* Defines a module for use in lazy resolving.
*
* @param a_Mod The module name (C name).
* @param a_pszFile The file to tell RTLdrLoad to load.
* @param a_pfnLoadIt Function to call for loading the DLL, replacing
* RTLdrLoad.
*/
#define RTLDRLAZY_MODULE_EX(a_Mod, a_pszFile, a_pfnLoadIt) \
static bool rtLdrLazy_##a_Mod##_Resolve(const char *pszName, void **ppvSymbol) \
{ \
static RTLDRMOD volatile s_hMod = NIL_RTLDRMOD; \
static bool volatile s_fLoaded = false; \
RTLDRMOD hMod; \
int rc; \
if (!s_fLoaded) \
{ \
rc = a_pfnLoadIt(a_pszFile, &hMod); \
s_hMod = RT_SUCCESS(rc) ? hMod : NIL_RTLDRMOD; \
s_fLoaded = true; \
if (RT_FAILURE(rc)) \
return false; \
} \
hMod = s_hMod; \
if (hMod == NIL_RTLDRMOD) \
return false; \
rc = RTLdrGetSymbol(hMod, pszName, ppvSymbol); \
return RT_SUCCESS(rc); \
}
/** Function name mangler for preventing collision with system prototypes. */
#define RTLDRLAZY_FUNC_NAME(a_Mod, a_Name) a_Mod##__##a_Name
/**
* Defines a function that should be lazily resolved.
*/
#define RTLDRLAZY_FUNC(a_Mod, a_RetType, a_CallConv, a_Name, a_ParamDecl, a_ParamNames, a_ErrRet) \
DECLINLINE(a_RetType) RTLDRLAZY_FUNC_NAME(a_Mod, a_Name) a_ParamDecl \
{ \
static a_RetType (a_CallConv * s_pfn) a_ParamDecl; \
if (!s_pfn) \
{ \
if (!rtLdrLazy_##a_Mod##_Resolve(#a_Name, (void **)&s_pfn)) \
return a_ErrRet; \
} \
return s_pfn a_ParamNames; \
}
/** @} */
#endif /* !IPRT_INCLUDED_ldrlazy_h */
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