1/*
2 * Copyright (C) 2007 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef SoftLinking_h
30#define SoftLinking_h
31
32#include <windows.h>
33#include <wtf/Assertions.h>
34
35#define SOFT_LINK_LIBRARY_HELPER(lib, suffix) \
36    static HMODULE lib##Library() \
37    { \
38        static HMODULE library = LoadLibraryW(L###lib suffix); \
39        return library; \
40    }
41
42#if OS(WINCE)
43#define SOFT_LINK_GETPROCADDRESS GetProcAddressA
44#else
45#define SOFT_LINK_GETPROCADDRESS GetProcAddress
46#endif
47
48#define SOFT_LINK_LIBRARY(lib) SOFT_LINK_LIBRARY_HELPER(lib, L".dll")
49#define SOFT_LINK_DEBUG_LIBRARY(lib) SOFT_LINK_LIBRARY_HELPER(lib, L"_debug.dll")
50
51#define SOFT_LINK(library, functionName, resultType, callingConvention, parameterDeclarations, parameterNames) \
52    static resultType callingConvention init##functionName parameterDeclarations; \
53    static resultType (callingConvention*softLink##functionName) parameterDeclarations = init##functionName; \
54    \
55    static resultType callingConvention init##functionName parameterDeclarations \
56    { \
57        softLink##functionName = reinterpret_cast<resultType (callingConvention*) parameterDeclarations>(SOFT_LINK_GETPROCADDRESS(library##Library(), #functionName)); \
58        ASSERT(softLink##functionName); \
59        return softLink##functionName parameterNames; \
60    }\
61    \
62    inline resultType functionName parameterDeclarations \
63    {\
64        return softLink##functionName parameterNames; \
65    }
66
67#define SOFT_LINK_OPTIONAL(library, functionName, resultType, callingConvention, parameterDeclarations) \
68    typedef resultType (callingConvention *functionName##PtrType) parameterDeclarations; \
69    static functionName##PtrType functionName##Ptr() \
70    { \
71        static functionName##PtrType ptr; \
72        static bool initialized; \
73        \
74        if (initialized) \
75            return ptr; \
76        initialized = true; \
77        \
78        ptr = reinterpret_cast<functionName##PtrType>(SOFT_LINK_GETPROCADDRESS(library##Library(), #functionName)); \
79        return ptr; \
80    }\
81
82#endif // SoftLinking_h
83