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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5 | Copyright (C) 1991, 1995, 1996, 1998, 1999, 2000 |
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6 | Free Software Foundation, Inc. |
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7 | Contributed by Ron Guilmette (rfg@segfault.us.com) |
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8 | |
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9 | This file is part of GCC. |
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10 | |
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11 | GCC is free software; you can redistribute it and/or modify it under |
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12 | the terms of the GNU General Public License as published by the Free |
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13 | Software Foundation; either version 2, or (at your option) any later |
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14 | version. |
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15 | |
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16 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
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17 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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18 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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19 | for more details. |
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20 | |
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21 | You should have received a copy of the GNU General Public License |
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22 | along with GCC; see the file COPYING. If not, write to the Free |
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23 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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24 | 02111-1307, USA. */ |
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25 | |
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26 | /* This file contains definitions and declarations of things |
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27 | relating to the normal start-up-time invocation of C++ |
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28 | file-scope static object constructors. These declarations |
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29 | and definitions are used by *both* libgcc2.c and by crtstuff.c. |
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30 | |
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31 | Note that this file should only be compiled with GCC. |
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32 | */ |
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33 | |
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34 | #ifdef NEED_ATEXIT |
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35 | extern int atexit (void (*) (void)); |
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36 | #endif |
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37 | |
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38 | /* Declare a pointer to void function type. */ |
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39 | |
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40 | typedef void (*func_ptr) (void); |
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41 | |
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42 | /* Declare the set of symbols use as begin and end markers for the lists |
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43 | of global object constructors and global object destructors. */ |
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44 | |
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45 | extern func_ptr __CTOR_LIST__[]; |
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46 | extern func_ptr __DTOR_LIST__[]; |
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47 | |
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48 | /* Declare the routine which needs to get invoked at program start time. */ |
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49 | |
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50 | extern void __do_global_ctors (void); |
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51 | |
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52 | /* Declare the routine which needs to get invoked at program exit time. */ |
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53 | |
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54 | extern void __do_global_dtors (void); |
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55 | |
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56 | /* Define a macro with the code which needs to be executed at program |
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57 | start-up time. This macro is used in two places in crtstuff.c (for |
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58 | systems which support a .init section) and in one place in libgcc2.c |
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59 | (for those system which do *not* support a .init section). For all |
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60 | three places where this code might appear, it must be identical, so |
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61 | we define it once here as a macro to avoid various instances getting |
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62 | out-of-sync with one another. */ |
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63 | |
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64 | /* Some systems place the number of pointers |
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65 | in the first word of the table. |
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66 | On other systems, that word is -1. |
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67 | In all cases, the table is null-terminated. |
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68 | If the length is not recorded, count up to the null. */ |
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69 | |
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70 | /* Some systems use a different strategy for finding the ctors. |
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71 | For example, svr3. */ |
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72 | #ifndef DO_GLOBAL_CTORS_BODY |
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73 | #define DO_GLOBAL_CTORS_BODY \ |
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74 | do { \ |
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75 | unsigned long nptrs = (unsigned long) __CTOR_LIST__[0]; \ |
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76 | unsigned i; \ |
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77 | if (nptrs == (unsigned long)-1) \ |
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78 | for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++); \ |
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79 | for (i = nptrs; i >= 1; i--) \ |
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80 | __CTOR_LIST__[i] (); \ |
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81 | } while (0) |
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82 | #endif |
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83 | |
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