NetBSD/lib/csu/c++/c++rt0.c

114 lines
3.4 KiB
C

/* $NetBSD: c++rt0.c,v 1.10 2005/12/24 22:02:10 perry Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD 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 BY THE NETBSD FOUNDATION, INC. AND 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 THE FOUNDATION 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.
*/
/*
* Run-time module for GNU C++ compiled shared libraries.
*
* The linker constructs the following arrays of pointers to global
* constructors and destructors. The first element contains the
* number of pointers in each.
* The tables are also null-terminated.
*/
#include <stdlib.h>
/*
* We make the __{C,D}TOR_LIST__ symbols appear as type `SETD' and
* include a dummy local function in the set. This keeps references
* to these symbols local to the shared object this module is linked to.
*/
static void dummy __P((void)) { return; }
/* Note: this is "a.out" dependent. */
__asm(".stabs \"___CTOR_LIST__\",22,0,0,_dummy");
__asm(".stabs \"___DTOR_LIST__\",22,0,0,_dummy");
void (*__CTOR_LIST__[0]) __P((void));
void (*__DTOR_LIST__[0]) __P((void));
static void __dtors __P((void));
static void __ctors __P((void));
static void
__dtors()
{
unsigned long i = (unsigned long) __DTOR_LIST__[0];
void (**p)(void) = __DTOR_LIST__ + i;
while (i--)
(**p--)();
}
static void
__ctors()
{
unsigned long i = (unsigned long) __CTOR_LIST__[0];
void (**p)(void) = __CTOR_LIST__ + 1;
while (i--)
(**p++)();
}
extern void __init __P((void)) __asm(".init");
extern void __fini __P((void)) __asm(".fini");
void
__init()
{
static int initialized = 0;
/*
* Call global constructors.
* Arrange to call global destructors at exit.
*/
if (!initialized) {
initialized = 1;
__ctors();
}
}
void
__fini()
{
/*
* Call global destructors.
*/
__dtors();
}