83a650d90c
the loop that invokes the static constructors. That makes it safe to link c++rt0.o into any shared library, even one that does not have any static constructors. Formerly, doing that would cause a bus error. If the library has no static constructors, __CTOR_LIST__ comes out as a simple 4-byte COMMON region, and it does not have the usual NULL word that terminates the list of constructors. This caused the old code to "call" a garbage address via the non-existent entry __CTOR_LIST__[1]. The analogous code that invokes the static destructors was already safe. This change is fully backward-compatible. Reviewed by: dfr@render.com (Doug Rabson)
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
|
|
* Copyright (c) 1993 Paul Kranenburg
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Paul Kranenburg.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
*
|
|
* $Id: c++rt0.c,v 1.3 1995/06/27 09:53:24 dfr Exp $
|
|
*/
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
void (*__CTOR_LIST__[0])(void);
|
|
void (*__DTOR_LIST__[0])(void);
|
|
|
|
static void
|
|
__dtors(void)
|
|
{
|
|
unsigned long i = (unsigned long) __DTOR_LIST__[0];
|
|
void (**p)(void) = __DTOR_LIST__ + i;
|
|
|
|
while (i--)
|
|
(**p--)();
|
|
}
|
|
|
|
static void
|
|
__ctors(void)
|
|
{
|
|
/*
|
|
* If the shared library doesn't have any static constructors in it,
|
|
* then __CTOR_LIST__ will come out as a simple COMMON region of
|
|
* 4 bytes. That is why we have to check the count in the first
|
|
* word.
|
|
*/
|
|
if ((unsigned long) __CTOR_LIST__[0] > 0) {
|
|
void (**p)(void) = __CTOR_LIST__ + 1;
|
|
|
|
while (*p)
|
|
(**p++)();
|
|
}
|
|
}
|
|
|
|
extern void __init() asm(".init");
|
|
extern void __fini() asm(".fini");
|
|
|
|
void
|
|
__init(void)
|
|
{
|
|
static int initialized = 0;
|
|
|
|
/*
|
|
* Call global constructors.
|
|
* Arrange to call global destructors at exit.
|
|
*/
|
|
if (!initialized) {
|
|
initialized = 1;
|
|
__ctors();
|
|
}
|
|
|
|
}
|
|
|
|
void
|
|
__fini(void)
|
|
{
|
|
__dtors();
|
|
}
|