SoftLinking.h revision cad810f21b803229eb11403f9209855525a25d57 
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#import <wtf/Assertions.h>
30#import <dlfcn.h>
31
32#define SOFT_LINK_LIBRARY(lib) \
33    static void* lib##Library() \
34    { \
35        static void* dylib = dlopen("/usr/lib/" #lib ".dylib", RTLD_NOW); \
36        ASSERT(dylib); \
37        return dylib; \
38    }
39
40#define SOFT_LINK_FRAMEWORK(framework) \
41    static void* framework##Library() \
42    { \
43        static void* frameworkLibrary = dlopen("/System/Library/Frameworks/" #framework ".framework/" #framework, RTLD_NOW); \
44        ASSERT(frameworkLibrary); \
45        return frameworkLibrary; \
46    }
47
48#define SOFT_LINK(framework, functionName, resultType, parameterDeclarations, parameterNames) \
49    static resultType init##functionName parameterDeclarations; \
50    static resultType (*softLink##functionName) parameterDeclarations = init##functionName; \
51    \
52    static resultType init##functionName parameterDeclarations \
53    { \
54        softLink##functionName = (resultType (*) parameterDeclarations) dlsym(framework##Library(), #functionName); \
55        ASSERT(softLink##functionName); \
56        return softLink##functionName parameterNames; \
57    }\
58    \
59    inline resultType functionName parameterDeclarations \
60    {\
61        return softLink##functionName parameterNames; \
62    }
63
64#define SOFT_LINK_CLASS(framework, className) \
65    static Class init##className(); \
66    static Class (*get##className##Class)() = init##className; \
67    static Class class##className; \
68    \
69    static Class className##Function() \
70    { \
71        return class##className; \
72    }\
73    \
74    static Class init##className() \
75    { \
76        framework##Library(); \
77        class##className = objc_getClass(#className); \
78        ASSERT(class##className); \
79        get##className##Class = className##Function; \
80        return class##className; \
81    }
82
83#define SOFT_LINK_POINTER(framework, name, type) \
84    static type init##name(); \
85    static type (*get##name)() = init##name; \
86    static type pointer##name; \
87    \
88    static type name##Function() \
89    { \
90        return pointer##name; \
91    }\
92    \
93    static type init##name() \
94    { \
95        void** pointer = static_cast<void**>(dlsym(framework##Library(), #name)); \
96        ASSERT(pointer); \
97        pointer##name = static_cast<type>(*pointer); \
98        get##name = name##Function; \
99        return pointer##name; \
100    }
101
102#define SOFT_LINK_CONSTANT(framework, name, type) \
103    static type init##name(); \
104    static type (*get##name)() = init##name; \
105    static type constant##name; \
106    \
107    static type name##Function() \
108    { \
109        return constant##name; \
110    }\
111    \
112    static type init##name() \
113    { \
114        void* constant = dlsym(framework##Library(), #name); \
115        ASSERT(constant); \
116        constant##name = *static_cast<type*>(constant); \
117        get##name = name##Function; \
118        return constant##name; \
119    }
120