gcc/gen-protos.c

   1 /* gen-protos.c - massages a list of prototypes, for use by fixproto.
   2    Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify it
   5 under the terms of the GNU General Public License as published by the
   6 Free Software Foundation; either version 2, or (at your option) any
   7 later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include <stdio.h>
  19 #include <ctype.h>
  20 #include "hconfig.h"
  21 #include "scan.h"
  22 #include "cpplib.h"
  23 #include "cpphash.h"
  24
  25 #define HASH_SIZE 2503 /* a prime */
  26
  27 int
  28 hashf (name, len, hashsize)
  29      register U_CHAR *name;
  30      register int len;
  31      int hashsize;
  32 {
  33   register int r = 0;
  34
  35   while (len--)
  36     r = HASHSTEP (r, *name++);
  37
  38   return MAKE_POS (r) % hashsize;
  39 }
  40
  41 int hash_tab[HASH_SIZE];
  42 int verbose = 0;
  43
  44 sstring linebuf;
  45
  46 /* Avoid error if config defines abort as fancy_abort.
  47    It's not worth "really" implementing this because ordinary
  48    compiler users never run fix-header.  */
  49
  50 void
  51 fancy_abort ()
  52 {
  53   abort ();
  54 }
  55
  56 int
  57 main (argc, argv)
  58      int argc;
  59      char** argv;
  60 {
  61   FILE *inf = stdin;
  62   FILE *outf = stdout;
  63   int next_index = 0;
  64   int i, i0;
  65
  66   fprintf (outf, "struct fn_decl std_protos[] = {\n");
  67
  68   for (;;)
  69     {
  70       int c = skip_spaces (inf, ' ');
  71       int param_nesting = 1;
  72       char *param_start, *param_end, *decl_start,
  73       *name_start, *name_end;
  74       register char *ptr;
  75       if (c == EOF)
  76         break;
  77       linebuf.ptr = linebuf.base;
  78       ungetc (c, inf);
  79       c = read_upto (inf, &linebuf, '\n');
  80       if (linebuf.base[0] == '#') /* skip cpp command */
  81         continue;
  82       if (linebuf.base[0] == '\0') /* skip empty line */
  83         continue;
  84
  85       ptr = linebuf.ptr - 1;
  86       while (*ptr == ' ' || *ptr == '\t') ptr--;
  87       if (*ptr-- != ';')
  88         {
  89           fprintf (stderr, "Funny input line: %s\n", linebuf.base);
  90           continue;
  91         }
  92       while (*ptr == ' ' || *ptr == '\t') ptr--;
  93       if (*ptr != ')')
  94         {
  95           fprintf (stderr, "Funny input line: %s\n", linebuf.base);
  96           continue;
  97         }
  98       param_end = ptr;
  99       for (;;)
 100         {
 101           int c = *--ptr;
 102           if (c == '(' && --param_nesting == 0)
 103             break;
 104           else if (c == ')')
 105             param_nesting++;
 106         }
 107       param_start = ptr+1;
 108
 109       ptr--;
 110       while (*ptr == ' ' || *ptr == '\t') ptr--;
 111
 112       if (!isalnum (*ptr))
 113         {
 114           if (verbose)
 115             fprintf (stderr, "%s: Can't handle this complex prototype: %s\n",
 116                      argv[0], linebuf.base);
 117           continue;
 118         }
 119       name_end = ptr+1;
 120
 121       while (isalnum (*ptr) || *ptr == '_') --ptr;
 122       name_start = ptr+1;
 123       while (*ptr == ' ' || *ptr == '\t') ptr--;
 124       ptr[1] = 0;
 125       *name_end = 0;
 126       *param_end = 0;
 127       *name_end = 0;
 128
 129       decl_start = linebuf.base;
 130       if (strncmp (decl_start, "typedef ", 8) == 0)
 131         continue;
 132       if (strncmp (decl_start, "extern ", 7) == 0)
 133         decl_start += 7;
 134
 135
 136       /* NOTE:  If you edit this,
 137          also edit lookup_std_proto in fix-header.c !! */
 138       i = hashf (name_start, name_end - name_start, HASH_SIZE);
 139       i0 = i;
 140       if (hash_tab[i] != 0)
 141         {
 142           for (;;)
 143             {
 144               i = (i+1) % HASH_SIZE;
 145               if (i == i0)
 146                 abort ();
 147               if (hash_tab[i] == 0)
 148                 break;
 149             }
 150         }
 151       hash_tab[i] = next_index;
 152
 153       fprintf (outf, "  {\"%s\", \"%s\", \"%s\" },\n",
 154                name_start, decl_start, param_start);
 155
 156       next_index++;
 157
 158       if (c == EOF)
 159         break;
 160     }
 161   fprintf (outf, "{0, 0, 0}\n};\n");
 162
 163
 164   fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);
 165   fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");
 166   for (i = 0; i < HASH_SIZE; i++)
 167     fprintf (outf, "  %d,\n", hash_tab[i]);
 168   fprintf (outf, "};\n");
 169
 170   return 0;
 171 }
 172
 173 void
 174 fatal (s)
 175      char *s;
 176 {
 177   fprintf (stderr, "%s: %s\n", "gen-protos", s);
 178   exit (FATAL_EXIT_CODE);
 179 }