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/*
* Copyright (C) 2007 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SoftLinking_h
#define SoftLinking_h
#include <windows.h>
#include <wtf/Assertions.h>
#define SOFT_LINK_LIBRARY_HELPER(lib, suffix) \
static HMODULE lib##Library() \
{ \
static HMODULE library = LoadLibraryW(L###lib suffix); \
return library; \
}
#if OS(WINCE)
#define SOFT_LINK_GETPROCADDRESS GetProcAddressA
#else
#define SOFT_LINK_GETPROCADDRESS GetProcAddress
#endif
#define SOFT_LINK_LIBRARY(lib) SOFT_LINK_LIBRARY_HELPER(lib, L".dll")
#define SOFT_LINK_DEBUG_LIBRARY(lib) SOFT_LINK_LIBRARY_HELPER(lib, L"_debug.dll")
#define SOFT_LINK(library, functionName, resultType, callingConvention, parameterDeclarations, parameterNames) \
static resultType callingConvention init##functionName parameterDeclarations; \
static resultType (callingConvention*softLink##functionName) parameterDeclarations = init##functionName; \
\
static resultType callingConvention init##functionName parameterDeclarations \
{ \
softLink##functionName = reinterpret_cast<resultType (callingConvention*) parameterDeclarations>(SOFT_LINK_GETPROCADDRESS(library##Library(), #functionName)); \
ASSERT(softLink##functionName); \
return softLink##functionName parameterNames; \
}\
\
inline resultType functionName parameterDeclarations \
{\
return softLink##functionName parameterNames; \
}
#define SOFT_LINK_OPTIONAL(library, functionName, resultType, callingConvention, parameterDeclarations) \
typedef resultType (callingConvention *functionName##PtrType) parameterDeclarations; \
static functionName##PtrType functionName##Ptr() \
{ \
static functionName##PtrType ptr; \
static bool initialized; \
\
if (initialized) \
return ptr; \
initialized = true; \
\
ptr = reinterpret_cast<functionName##PtrType>(SOFT_LINK_GETPROCADDRESS(library##Library(), #functionName)); \
return ptr; \
}\
#define SOFT_LINK_LOADED_LIBRARY(library, functionName, resultType, callingConvention, parameterDeclarations) \
typedef resultType (callingConvention *functionName##PtrType) parameterDeclarations; \
static functionName##PtrType functionName##Ptr() \
{ \
static functionName##PtrType ptr; \
static bool initialized; \
\
if (initialized) \
return ptr; \
initialized = true; \
\
static HINSTANCE libraryInstance = ::GetModuleHandle(L#library); \
\
ptr = reinterpret_cast<functionName##PtrType>(SOFT_LINK_GETPROCADDRESS(libraryInstance, #functionName)); \
return ptr; \
}\
/*
In order to soft link against functions decorated with __declspec(dllimport), we prepend "softLink_" to the function names.
If you use SOFT_LINK_DLL_IMPORT(), you will also need to #define the function name to account for this, e.g.:
SOFT_LINK_DLL_IMPORT(myLibrary, myFunction, ...)
#define myFunction softLink_myFunction
*/
#define SOFT_LINK_DLL_IMPORT(library, functionName, resultType, callingConvention, parameterDeclarations, parameterNames) \
static resultType callingConvention init##functionName parameterDeclarations; \
static resultType(callingConvention*softLink##functionName) parameterDeclarations = init##functionName; \
\
static resultType callingConvention init##functionName parameterDeclarations \
{ \
softLink##functionName = reinterpret_cast<resultType (callingConvention*)parameterDeclarations>(SOFT_LINK_GETPROCADDRESS(library##Library(), #functionName)); \
ASSERT(softLink##functionName); \
return softLink##functionName parameterNames; \
}\
\
inline resultType softLink_##functionName parameterDeclarations \
{\
return softLink##functionName parameterNames; \
}
#define SOFT_LINK_DLL_IMPORT_OPTIONAL(library, functionName, resultType, callingConvention, parameterDeclarations) \
typedef resultType (callingConvention *functionName##PtrType) parameterDeclarations; \
static functionName##PtrType functionName##Ptr() \
{ \
static functionName##PtrType ptr; \
static bool initialized; \
\
if (initialized) \
return ptr; \
initialized = true; \
\
ptr = reinterpret_cast<resultType(callingConvention*)parameterDeclarations>(SOFT_LINK_GETPROCADDRESS(library##Library(), #functionName)); \
return ptr; \
}\
#define SOFT_LINK_DLL_IMPORT_OPTIONAL(library, functionName, resultType, callingConvention, parameterDeclarations) \
typedef resultType (callingConvention *functionName##PtrType) parameterDeclarations; \
static functionName##PtrType functionName##Ptr() \
{ \
static functionName##PtrType ptr; \
static bool initialized; \
\
if (initialized) \
return ptr; \
initialized = true; \
\
ptr = reinterpret_cast<resultType(callingConvention*)parameterDeclarations>(SOFT_LINK_GETPROCADDRESS(library##Library(), #functionName)); \
return ptr; \
}\
/*
Variables exported by a DLL need to be accessed through a function.
If you use SOFT_LINK_VARIABLE_DLL_IMPORT(), you will also need to #define the variable name to account for this, e.g.:
SOFT_LINK_VARIABLE_DLL_IMPORT(myLibrary, myVar, int)
#define myVar get_myVar()
*/
#define SOFT_LINK_VARIABLE_DLL_IMPORT(library, variableName, variableType) \
static variableType get##variableName() \
{ \
static variableType* ptr = reinterpret_cast<variableType*>(SOFT_LINK_GETPROCADDRESS(library##Library(), #variableName)); \
ASSERT(ptr); \
return *ptr; \
}\
/*
Note that this will only work for variable types for which a return value of 0 can signal an error.
*/
#define SOFT_LINK_VARIABLE_DLL_IMPORT_OPTIONAL(library, variableName, variableType) \
static variableType get##variableName() \
{ \
static variableType* ptr = reinterpret_cast<variableType*>(SOFT_LINK_GETPROCADDRESS(library##Library(), #variableName)); \
if (!ptr) \
return 0; \
return *ptr; \
}\
#endif // SoftLinking_h
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