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1 /* Definitions relating to the special __do_global_init function used
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2 for getting g++ file-scope static objects constructed. This file
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3 will get included either by libgcc2.c (for systems that don't support
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4 a .init section) or by crtstuff.c (for those that do).
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145
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5 Copyright (C) 1991-2020 Free Software Foundation, Inc.
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6 Contributed by Ron Guilmette (rfg@segfault.us.com)
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7
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8 This file is part of GCC.
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9
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10 GCC is free software; you can redistribute it and/or modify it under
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11 the terms of the GNU General Public License as published by the Free
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12 Software Foundation; either version 3, or (at your option) any later
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13 version.
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14
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15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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18 for more details.
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19
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20 Under Section 7 of GPL version 3, you are granted additional
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21 permissions described in the GCC Runtime Library Exception, version
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22 3.1, as published by the Free Software Foundation.
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23
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24 You should have received a copy of the GNU General Public License and
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25 a copy of the GCC Runtime Library Exception along with this program;
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26 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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27 <http://www.gnu.org/licenses/>. */
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28
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29 /* This file contains definitions and declarations of things
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30 relating to the normal start-up-time invocation of C++
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31 file-scope static object constructors. These declarations
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32 and definitions are used by *both* libgcc2.c and by crtstuff.c.
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33
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34 Note that this file should only be compiled with GCC.
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35 */
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36
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37 #ifndef GCC_GBL_CTORS_H
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38 #define GCC_GBL_CTORS_H
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39
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40 /* Declare a pointer to void function type. */
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41
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42 typedef void (*func_ptr) (void);
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43
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44 /* Declare the set of symbols use as begin and end markers for the lists
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45 of global object constructors and global object destructors. */
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46
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47 extern func_ptr __CTOR_LIST__[];
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48 extern func_ptr __DTOR_LIST__[];
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49
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50 /* Declare the routine which needs to get invoked at program start time. */
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51
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52 extern void __do_global_ctors (void);
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53
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54 /* Declare the routine which needs to get invoked at program exit time. */
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55
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56 extern void __do_global_dtors (void);
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57
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58 /* Define a macro with the code which needs to be executed at program
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59 start-up time. This macro is used in two places in crtstuff.c (for
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60 systems which support a .init section) and in one place in libgcc2.c
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61 (for those system which do *not* support a .init section). For all
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62 three places where this code might appear, it must be identical, so
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63 we define it once here as a macro to avoid various instances getting
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64 out-of-sync with one another. */
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65
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66 /* Some systems place the number of pointers
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67 in the first word of the table.
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68 On other systems, that word is -1.
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69 In all cases, the table is null-terminated.
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70 If the length is not recorded, count up to the null. */
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71
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72 /* Some systems use a different strategy for finding the ctors.
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73 For example, svr3. */
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74 #ifndef DO_GLOBAL_CTORS_BODY
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75 #define DO_GLOBAL_CTORS_BODY \
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76 do { \
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77 __SIZE_TYPE__ nptrs = (__SIZE_TYPE__) __CTOR_LIST__[0]; \
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78 unsigned i; \
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79 if (nptrs == (__SIZE_TYPE__)-1) \
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80 for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++); \
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81 for (i = nptrs; i >= 1; i--) \
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82 __CTOR_LIST__[i] (); \
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83 } while (0)
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84 #endif
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85
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86 #endif /* GCC_GBL_CTORS_H */
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