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/* Definitions relating to the special __do_global_init function used
for getting g++ file-scope static objects constructed. This file
will get included either by libgcc2.c (for systems that don't support
a .init section) or by crtstuff.c (for those that do).
Copyright (C) 1991-2021 Free Software Foundation, Inc.
Contributed by Ron Guilmette (
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<>. */
/* This file contains definitions and declarations of things
relating to the normal start-up-time invocation of C++
file-scope static object constructors. These declarations
and definitions are used by *both* libgcc2.c and by crtstuff.c.
Note that this file should only be compiled with GCC.
/* Declare a pointer to void function type. */
typedef void (*func_ptr) (void);
/* Declare the set of symbols use as begin and end markers for the lists
of global object constructors and global object destructors. */
extern func_ptr __CTOR_LIST__[];
extern func_ptr __DTOR_LIST__[];
/* Declare the routine which needs to get invoked at program start time. */
extern void __do_global_ctors (void);
/* Declare the routine which needs to get invoked at program exit time. */
extern void __do_global_dtors (void);
/* Define a macro with the code which needs to be executed at program
start-up time. This macro is used in two places in crtstuff.c (for
systems which support a .init section) and in one place in libgcc2.c
(for those system which do *not* support a .init section). For all
three places where this code might appear, it must be identical, so
we define it once here as a macro to avoid various instances getting
out-of-sync with one another. */
/* Some systems place the number of pointers
in the first word of the table.
On other systems, that word is -1.
In all cases, the table is null-terminated.
If the length is not recorded, count up to the null. */
/* Some systems use a different strategy for finding the ctors.
For example, svr3. */
do { \
__SIZE_TYPE__ nptrs = (__SIZE_TYPE__) __CTOR_LIST__[0]; \
unsigned i; \
if (nptrs == (__SIZE_TYPE__)-1) \
for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++); \
for (i = nptrs; i >= 1; i--) \
__CTOR_LIST__[i] (); \
} while (0)
#endif /* GCC_GBL_CTORS_H */