84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/* Definitions relating to the special __do_global_init function used
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for getting g++ file-scope static objects constructed. This file
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will get included either by libgcc2.c (for systems that don't support
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a .init section) or by crtstuff.c (for those that do).
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Copyright (C) 1991, 1995, 1996, 1998, 1999, 2000
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Free Software Foundation, Inc.
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Contributed by Ron Guilmette (rfg@segfault.us.com)
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* This file contains definitions and declarations of things
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relating to the normal start-up-time invocation of C++
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file-scope static object constructors. These declarations
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and definitions are used by *both* libgcc2.c and by crtstuff.c.
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Note that this file should only be compiled with GCC.
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*/
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#ifdef NEED_ATEXIT
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extern int atexit (void (*) (void));
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#endif
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/* Declare a pointer to void function type. */
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typedef void (*func_ptr) (void);
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/* Declare the set of symbols use as begin and end markers for the lists
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of global object constructors and global object destructors. */
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extern func_ptr __CTOR_LIST__[];
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extern func_ptr __DTOR_LIST__[];
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/* Declare the routine which needs to get invoked at program start time. */
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extern void __do_global_ctors (void);
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/* Declare the routine which needs to get invoked at program exit time. */
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extern void __do_global_dtors (void);
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/* Define a macro with the code which needs to be executed at program
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start-up time. This macro is used in two places in crtstuff.c (for
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systems which support a .init section) and in one place in libgcc2.c
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(for those system which do *not* support a .init section). For all
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three places where this code might appear, it must be identical, so
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we define it once here as a macro to avoid various instances getting
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out-of-sync with one another. */
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/* Some systems place the number of pointers
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in the first word of the table.
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On other systems, that word is -1.
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In all cases, the table is null-terminated.
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If the length is not recorded, count up to the null. */
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/* Some systems use a different strategy for finding the ctors.
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For example, svr3. */
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#ifndef DO_GLOBAL_CTORS_BODY
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#define DO_GLOBAL_CTORS_BODY \
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do { \
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unsigned long nptrs = (unsigned long) __CTOR_LIST__[0]; \
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unsigned i; \
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if (nptrs == (unsigned long)-1) \
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for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++); \
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for (i = nptrs; i >= 1; i--) \
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__CTOR_LIST__[i] (); \
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} while (0)
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#endif
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