libchill/chillrt0.c

   1 /* Implement runtime actions for CHILL.
   2    Copyright (C) 1992,1993 Free Software Foundation, Inc.
   3    Author: Wilfried Moser
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <errno.h>
  32 #include <string.h>
  33
  34 #include "rtltypes.h"
  35 #include "iomodes.h"
  36 \f
  37 /* type definitions */
  38 typedef void (*init_ptr) ();
  39 typedef void (*rts_init_ptr) (int *argc, char *argv []);
  40
  41 typedef struct INIT_LIST
  42 {
  43   init_ptr             code;
  44   struct INIT_LIST     *forward;
  45 } InitList;
  46
  47 InitList    *_ch_init_list = 0;
  48
  49 /* force linker to get correct RTS functions */
  50 extern rts_init_ptr     __RTS_INIT__;
  51 extern init_ptr         __RTS_MAIN_LOOP__;
  52 extern init_ptr         __RTS_FETCH_NUMBERS__;
  53 extern init_ptr         __RTS_FETCH_NAMES__;
  54 static init_ptr         *rts_dummies[4] =
  55 {
  56   &__RTS_INIT__,
  57   &__RTS_MAIN_LOOP__,
  58   &__RTS_FETCH_NUMBERS__,
  59   &__RTS_FETCH_NAMES__,
  60 };
  61
  62 /* chill argc and argv */
  63 int                     chill_argc = 0;
  64 TVaryingCharType        **chill_argv = NULL;
  65
  66 /* the program name for debugging purpose */
  67 char                    *progname = 0;
  68 \f
  69 extern void *__xmalloc_ ();
  70
  71 /*
  72  * function __xrealloc_
  73  *
  74  * parameter:
  75  *   ptr                pointer to reallocate
  76  *   size               new number of bytes
  77  *
  78  * returns:
  79  *  void*
  80  *
  81  * abstract:
  82  *  This is the general reallocation routine for libchill
  83  *
  84  */
  85
  86 void *
  87 __xrealloc_ (ptr, size)
  88 void *ptr;
  89 int size;
  90 {
  91   void  *tmp = realloc (ptr, size);
  92
  93   if (!tmp)
  94     {
  95       fprintf (stderr, "ChillLib: Out of heap space.\n");
  96       fflush (stderr);
  97       exit (ENOMEM);
  98     }
  99   return (tmp);
 100 } /* __xrealloc_ */
 101 \f
 102 static void
 103 setup_argc_argv (argc, argv)
 104 int argc;
 105 char *argv[];
 106 {
 107   int           i;
 108
 109   chill_argv = __xmalloc_ ((argc + 1) * sizeof (TVaryingCharType *));
 110   for (i = 0; i < argc; i++)
 111     {
 112       chill_argv[i] = __xmalloc_ (sizeof (TVaryingCharType) + strlen (argv[i]) + 1);
 113       chill_argv[i]->len = strlen (argv[i]);
 114       strcpy (chill_argv[i]->body, argv[i]);
 115     }
 116   chill_argv[chill_argc = argc] = NULL;
 117
 118   if ((progname = strrchr (argv[0], '/')) == 0)
 119     progname = argv[0];
 120   else
 121     progname++;
 122
 123 } /* setup_argc_argv */
 124
 125 extern void __setexceptionStack ();
 126
 127 /*--------- main entry for each CHILL - program ----------*/
 128 int
 129 main (argc, argv)
 130      int argc;
 131      char *argv [];
 132 {
 133   /* call look up for tasking */
 134   (*__RTS_INIT__) (&argc, argv);
 135
 136   /* setup argc and argv */
 137   setup_argc_argv (argc, argv);
 138
 139   /* clear exception stack */
 140   __setexceptionStack (0);
 141
 142   /* now call code at module level */
 143   while (_ch_init_list)
 144     {
 145       if (_ch_init_list->code)
 146         (*(_ch_init_list->code)) ();
 147       _ch_init_list = _ch_init_list->forward;
 148     }
 149
 150   /* if we have rts linked, something will be done, else just return */
 151   (*__RTS_MAIN_LOOP__) ();
 152
 153   return (0);
 154
 155 } /* main */