/*

 * 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.

 */

#import <wtf/Assertions.h>

#import <dlfcn.h>

#define SOFT_LINK_LIBRARY(lib) \

    static void* lib##Library() \

    { \

        static void* dylib = dlopen("/usr/lib/" #lib ".dylib", RTLD_NOW); \

        ASSERT(dylib); \

        return dylib; \

    }

#define SOFT_LINK_FRAMEWORK(framework) \

    static void* framework##Library() \

    { \

        static void* frameworkLibrary = dlopen("/System/Library/Frameworks/" #framework ".framework/" #framework, RTLD_NOW); \

        ASSERT(frameworkLibrary); \

        return frameworkLibrary; \

    }

#define SOFT_LINK(framework, functionName, resultType, parameterDeclarations, parameterNames) \

    static resultType init##functionName parameterDeclarations; \

    static resultType (*softLink##functionName) parameterDeclarations = init##functionName; \

    \

    static resultType init##functionName parameterDeclarations \

    { \

        softLink##functionName = (resultType (*) parameterDeclarations) dlsym(framework##Library(), #functionName); \

        ASSERT(softLink##functionName); \

        return softLink##functionName parameterNames; \

    }\

    \

    inline resultType functionName parameterDeclarations \

    {\

        return softLink##functionName parameterNames; \

    }

#define SOFT_LINK_CLASS(framework, className) \

    static Class init##className(); \

    static Class (*get##className##Class)() = init##className; \

    static Class class##className; \

    \

    static Class className##Function() \

    { \

        return class##className; \

    }\

    \

    static Class init##className() \

    { \

        framework##Library(); \

        class##className = objc_getClass(#className); \

        ASSERT(class##className); \

        get##className##Class = className##Function; \

        return class##className; \

    }

#define SOFT_LINK_POINTER(framework, name, type) \

    static type init##name(); \

    static type (*get##name)() = init##name; \

    static type pointer##name; \

    \

    static type name##Function() \

    { \

        return pointer##name; \

    }\

    \

    static type init##name() \

    { \

        void** pointer = static_cast<void**>(dlsym(framework##Library(), #name)); \

        ASSERT(pointer); \

        pointer##name = static_cast<type>(*pointer); \

        get##name = name##Function; \

        return pointer##name; \

    }

#define SOFT_LINK_CONSTANT(framework, name, type) \

    static type init##name(); \

    static type (*get##name)() = init##name; \

    static type constant##name; \

    \

    static type name##Function() \

    { \

        return constant##name; \

    }\

    \

    static type init##name() \

    { \

        void* constant = dlsym(framework##Library(), #name); \

        ASSERT(constant); \

        constant##name = *static_cast<type*>(constant); \

        get##name = name##Function; \

        return constant##name; \

    }