inc/shared.h

/**
 * Copyright (c) 2019, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * 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.
 *    * Neither the name of The Linux Foundation 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 "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR 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 SHARED_H
#define SHARED_H

#if defined(__NIX)
// TODO these sections not supported?
//static __so_func *__autostart[] __attribute__((section (".CRT$XIU"))) = { (__so_func*)__so_ctor };
//static __so_func *__autoexit[] __attribute__((section (".CRT$XPU"))) = { (__so_func*)__so_dtor };

#define SHARED_OBJECT_API_ENTRY(ctor, dtor)

#elif defined(_WIN32)
#include <windows.h>

typedef int __so_cb(void);
static __so_cb *__so_get_ctor();
static __so_cb *__so_get_dtor();

typedef void __so_func(void);
static void __so_ctor() {
   (void)(__so_get_ctor())();
}

static void __so_dtor() {
   (void)(__so_get_dtor())();
}

#pragma data_seg(".CRT$XIU")
   static __so_func *__autostart[] = { (__so_func*)__so_ctor };
#pragma data_seg(".CRT$XPU")
   static __so_func *__autoexit[] = { (__so_func*)__so_dtor };
#pragma data_seg()

#define SHARED_OBJECT_API_ENTRY(ctor, dtor)\
   static __so_cb *__so_get_ctor() { return (__so_cb*)ctor; }\
   static __so_cb *__so_get_dtor() { return (__so_cb*)dtor; }

#else //better be gcc

#define SHARED_OBJECT_API_ENTRY(ctor, dtor)\
__attribute__((constructor)) \
static void __ctor__##ctor(void) {\
   (void)ctor();\
}\
\
__attribute__((destructor))\
static void  __dtor__##dtor(void) {\
   (void)dtor();\
}

#endif //ifdef _WIN32

#endif // SHARED_H