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https://github.com/adtools/clib2.git
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e3e82b3657
invoke the library's constructor/destructor functions in a very particular order. That way, you can use constructor/destructor functions in your own code and not have them clash with the library's own functions. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14871 87f5fb63-7c3d-0410-a384-fd976d0f7a62
132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/*
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* $Id: crtbegin.c,v 1.5 2005-03-09 21:07:25 obarthel Exp $
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*
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* :ts=4
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*
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* Handles global constructors and destructors.
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*/
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#include <exec/types.h>
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/****************************************************************************/
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#include <stdlib.h>
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#include <setjmp.h>
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/****************************************************************************/
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#if defined(__amigaos4__)
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/****************************************************************************/
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/*
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* Dummy constructor and destructor array. The linker script will put these at the
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* very beginning of section ".ctors" and ".dtors". crtend.o contains a similar entry
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* with a NULL pointer entry and is put at the end of the sections. This way, the init
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* code can find the global constructor/destructor pointers
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*/
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static void (*__CTOR_LIST__[1]) (void) __attribute__(( used, section(".ctors"), aligned(sizeof(void (*)(void))) ));
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static void (*__DTOR_LIST__[1]) (void) __attribute__(( used, section(".dtors"), aligned(sizeof(void (*)(void))) ));
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/****************************************************************************/
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STATIC VOID
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_do_ctors(void)
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{
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int num_ctors;
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int i;
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num_ctors = 0;
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for(i = 1 ; __CTOR_LIST__[i] != NULL ; i++)
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num_ctors++;
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for(i = 0 ; i < num_ctors ; i++)
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__CTOR_LIST__[num_ctors - i]();
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}
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/****************************************************************************/
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STATIC VOID
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_do_dtors(void)
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{
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int num_dtors;
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int i;
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num_dtors = 0;
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for(i = 1 ; __DTOR_LIST__[i] != NULL ; i++)
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num_dtors++;
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for(i = 0 ; i < num_dtors ; i++)
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__DTOR_LIST__[i+1]();
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}
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/****************************************************************************/
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#else
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/****************************************************************************/
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typedef void (*func_ptr)(void);
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/****************************************************************************/
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STATIC VOID
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_do_ctors(void)
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{
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extern func_ptr __CTOR_LIST__[];
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ULONG nptrs = (ULONG)__CTOR_LIST__[0];
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ULONG i;
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for(i = nptrs ; i > 0 ; i--)
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__CTOR_LIST__[i]();
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}
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/****************************************************************************/
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STATIC VOID
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_do_dtors(void)
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{
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extern func_ptr __DTOR_LIST__[];
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extern jmp_buf __exit_jmp_buf;
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ULONG nptrs = (ULONG)__DTOR_LIST__[0];
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static ULONG i;
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/* If one of the destructors drops into
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* exit(), processing will continue with
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* the next following destructor.
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*/
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(void)setjmp(__exit_jmp_buf);
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while(i++ < nptrs)
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__DTOR_LIST__[i]();
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}
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/****************************************************************************/
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#endif /*__amigaos4__ */
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/****************************************************************************/
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/* FIXME: Do we need to put these in .init/.fini sections? */
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//void _init(void) __attribute__((section(".init")));
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//void _fini(void) __attribute__((section(".fini")));
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/****************************************************************************/
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void
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_init(void)
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{
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_do_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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_do_dtors();
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}
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