d5489b0d8f
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
/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: c++rt0.c,v 1.3 1995/06/27 09:53:24 dfr Exp $
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*/
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/*
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* Run-time module for GNU C++ compiled shared libraries.
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*
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* The linker constructs the following arrays of pointers to global
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* constructors and destructors. The first element contains the
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* number of pointers in each.
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* The tables are also null-terminated.
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*/
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void (*__CTOR_LIST__[0])(void);
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void (*__DTOR_LIST__[0])(void);
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static void
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__dtors(void)
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{
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unsigned long i = (unsigned long) __DTOR_LIST__[0];
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void (**p)(void) = __DTOR_LIST__ + i;
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while (i--)
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(**p--)();
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}
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static void
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__ctors(void)
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{
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/*
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* If the shared library doesn't have any static constructors in it,
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* then __CTOR_LIST__ will come out as a simple COMMON region of
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* 4 bytes. That is why we have to check the count in the first
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* word.
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*/
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if ((unsigned long) __CTOR_LIST__[0] > 0) {
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void (**p)(void) = __CTOR_LIST__ + 1;
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while (*p)
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(**p++)();
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}
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}
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extern void __init() asm(".init");
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extern void __fini() asm(".fini");
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void
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__init(void)
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{
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static int initialized = 0;
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/*
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* Call global constructors.
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* Arrange to call global destructors at exit.
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*/
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if (!initialized) {
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initialized = 1;
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__ctors();
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}
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}
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void
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__fini(void)
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{
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__dtors();
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}
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