gcc/gen-protos.c

   1 /* gen-protos.c - massages a list of prototypes, for use by fixproto.
   2    Copyright (C) 1993, 94-96, 1998 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 "hconfig.h"
  19 #include "system.h"
  20 #include "scan.h"
  21 #include "cpplib.h"
  22 #include "cpphash.h"
  23 #undef abort
  24
  25 int verbose = 0;
  26 char *progname;
  27
  28 #define HASH_SIZE 2503 /* a prime */
  29 int hash_tab[HASH_SIZE];
  30 int next_index;
  31
  32 static void
  33 add_hash (fname)
  34      char *fname;
  35 {
  36   int i, i0;
  37
  38   /* NOTE:  If you edit this, also edit lookup_std_proto in fix-header.c !! */
  39   i = hashf (fname, strlen (fname), HASH_SIZE);
  40   i0 = i;
  41   if (hash_tab[i] != 0)
  42     {
  43       for (;;)
  44         {
  45           i = (i+1) % HASH_SIZE;
  46           if (i == i0)
  47             abort ();
  48           if (hash_tab[i] == 0)
  49             break;
  50         }
  51     }
  52   hash_tab[i] = next_index;
  53
  54   next_index++;
  55 }
  56
  57 /* Given a function prototype, fill in the fields of FN.
  58    The result is a boolean indicating if a function prototype was found.
  59
  60    The input string is modified (trailing NULs are inserted).
  61    The fields of FN point to the input string.  */
  62
  63 static int
  64 parse_fn_proto (start, end, fn)
  65      char *start, *end;
  66      struct fn_decl *fn;
  67 {
  68   register char *ptr;
  69   int param_nesting = 1;
  70   char *param_start, *param_end, *decl_start, *name_start, *name_end;
  71
  72   ptr = end - 1;
  73   while (*ptr == ' ' || *ptr == '\t') ptr--;
  74   if (*ptr-- != ';')
  75     {
  76       fprintf (stderr, "Funny input line: %s\n", start);
  77       return 0;
  78     }
  79   while (*ptr == ' ' || *ptr == '\t') ptr--;
  80   if (*ptr != ')')
  81     {
  82       fprintf (stderr, "Funny input line: %s\n", start);
  83       return 0;
  84     }
  85   param_end = ptr;
  86   for (;;)
  87     {
  88       int c = *--ptr;
  89       if (c == '(' && --param_nesting == 0)
  90         break;
  91       else if (c == ')')
  92         param_nesting++;
  93     }
  94   param_start = ptr+1;
  95
  96   ptr--;
  97   while (*ptr == ' ' || *ptr == '\t') ptr--;
  98
  99   if (!ISALNUM ((unsigned char)*ptr))
 100     {
 101       if (verbose)
 102         fprintf (stderr, "%s: Can't handle this complex prototype: %s\n",
 103                  progname, start);
 104       return 0;
 105     }
 106   name_end = ptr+1;
 107
 108   while (ISALNUM ((unsigned char)*ptr) || *ptr == '_') --ptr;
 109   name_start = ptr+1;
 110   while (*ptr == ' ' || *ptr == '\t') ptr--;
 111   ptr[1] = 0;
 112   *param_end = 0;
 113   *name_end = 0;
 114
 115   decl_start = start;
 116   if (strncmp (decl_start, "typedef ", 8) == 0)
 117     return 0;
 118   if (strncmp (decl_start, "extern ", 7) == 0)
 119     decl_start += 7;
 120
 121   fn->fname = name_start;
 122   fn->rtype = decl_start;
 123   fn->params = param_start;
 124   return 1;
 125 }
 126
 127 int
 128 main (argc, argv)
 129      int argc ATTRIBUTE_UNUSED;
 130      char **argv;
 131 {
 132   FILE *inf = stdin;
 133   FILE *outf = stdout;
 134   int i;
 135   sstring linebuf;
 136   struct fn_decl fn_decl;
 137
 138   i = strlen (argv[0]);
 139   while (i > 0 && argv[0][i-1] != '/') --i;
 140   progname = &argv[0][i];
 141
 142   INIT_SSTRING (&linebuf);
 143
 144   fprintf (outf, "struct fn_decl std_protos[] = {\n");
 145
 146   /* A hash table entry of 0 means "unused" so reserve it.  */
 147   fprintf (outf, "  {\"\", \"\", \"\", 0},\n");
 148   next_index = 1;
 149
 150   for (;;)
 151     {
 152       int c = skip_spaces (inf, ' ');
 153
 154       if (c == EOF)
 155         break;
 156       linebuf.ptr = linebuf.base;
 157       ungetc (c, inf);
 158       c = read_upto (inf, &linebuf, '\n');
 159       if (linebuf.base[0] == '#') /* skip cpp command */
 160         continue;
 161       if (linebuf.base[0] == '\0') /* skip empty line */
 162         continue;
 163
 164       if (! parse_fn_proto (linebuf.base, linebuf.ptr, &fn_decl))
 165         continue;
 166
 167       add_hash (fn_decl.fname);
 168
 169       fprintf (outf, "  {\"%s\", \"%s\", \"%s\", 0},\n",
 170                fn_decl.fname, fn_decl.rtype, fn_decl.params);
 171
 172       if (c == EOF)
 173         break;
 174     }
 175   fprintf (outf, "  {0, 0, 0, 0}\n};\n");
 176
 177
 178   fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);
 179   fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");
 180   for (i = 0; i < HASH_SIZE; i++)
 181     fprintf (outf, "  %d,\n", hash_tab[i]);
 182   fprintf (outf, "};\n");
 183
 184   return 0;
 185 }