contrib/gcc-3.4/gcc/gen-protos.c

   1 /* gen-protos.c - massages a list of prototypes, for use by fixproto.
   2    Copyright (C) 1993, 1994, 1995, 1996, 1998,
   3    1999, 2003 Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option) any
   8 later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #include "bconfig.h"
  20 #include "system.h"
  21 #include "coretypes.h"
  22 #include "tm.h"
  23 #include "scan.h"
  24 #undef abort
  25
  26 int verbose = 0;
  27 const char *progname;
  28
  29 static void add_hash (const char *);
  30 static int parse_fn_proto (char *, char *, struct fn_decl *);
  31
  32 #define HASH_SIZE 2503 /* a prime */
  33 int hash_tab[HASH_SIZE];
  34 int next_index;
  35 int collisions;
  36
  37 static void
  38 add_hash (const char *fname)
  39 {
  40   int i, i0;
  41
  42   /* NOTE:  If you edit this, also edit lookup_std_proto in fix-header.c !! */
  43   i = hashstr (fname, strlen (fname)) % HASH_SIZE;
  44   i0 = i;
  45   if (hash_tab[i] != 0)
  46     {
  47       collisions++;
  48       for (;;)
  49         {
  50           i = (i+1) % HASH_SIZE;
  51           if (i == i0)
  52             abort ();
  53           if (hash_tab[i] == 0)
  54             break;
  55         }
  56     }
  57   hash_tab[i] = next_index;
  58
  59   next_index++;
  60 }
  61
  62 /* Given a function prototype, fill in the fields of FN.
  63    The result is a boolean indicating if a function prototype was found.
  64
  65    The input string is modified (trailing NULs are inserted).
  66    The fields of FN point to the input string.  */
  67
  68 static int
  69 parse_fn_proto (char *start, char *end, struct fn_decl *fn)
  70 {
  71   char *ptr;
  72   int param_nesting = 1;
  73   char *param_start, *param_end, *decl_start, *name_start, *name_end;
  74
  75   ptr = end - 1;
  76   while (*ptr == ' ' || *ptr == '\t') ptr--;
  77   if (*ptr-- != ';')
  78     {
  79       fprintf (stderr, "Funny input line: %s\n", start);
  80       return 0;
  81     }
  82   while (*ptr == ' ' || *ptr == '\t') ptr--;
  83   if (*ptr != ')')
  84     {
  85       fprintf (stderr, "Funny input line: %s\n", start);
  86       return 0;
  87     }
  88   param_end = ptr;
  89   for (;;)
  90     {
  91       int c = *--ptr;
  92       if (c == '(' && --param_nesting == 0)
  93         break;
  94       else if (c == ')')
  95         param_nesting++;
  96     }
  97   param_start = ptr+1;
  98
  99   ptr--;
 100   while (*ptr == ' ' || *ptr == '\t') ptr--;
 101
 102   if (!ISALNUM ((unsigned char)*ptr))
 103     {
 104       if (verbose)
 105         fprintf (stderr, "%s: Can't handle this complex prototype: %s\n",
 106                  progname, start);
 107       return 0;
 108     }
 109   name_end = ptr+1;
 110
 111   while (ISIDNUM (*ptr))
 112     --ptr;
 113   name_start = ptr+1;
 114   while (*ptr == ' ' || *ptr == '\t') ptr--;
 115   ptr[1] = 0;
 116   *param_end = 0;
 117   *name_end = 0;
 118
 119   decl_start = start;
 120   if (strncmp (decl_start, "typedef ", 8) == 0)
 121     return 0;
 122   if (strncmp (decl_start, "extern ", 7) == 0)
 123     decl_start += 7;
 124
 125   fn->fname = name_start;
 126   fn->rtype = decl_start;
 127   fn->params = param_start;
 128   return 1;
 129 }
 130
 131 int
 132 main (int argc ATTRIBUTE_UNUSED, char **argv)
 133 {
 134   FILE *inf = stdin;
 135   FILE *outf = stdout;
 136   int i;
 137   sstring linebuf;
 138   struct fn_decl fn_decl;
 139
 140   i = strlen (argv[0]);
 141   while (i > 0 && argv[0][i-1] != '/') --i;
 142   progname = &argv[0][i];
 143
 144   INIT_SSTRING (&linebuf);
 145
 146   fprintf (outf, "struct fn_decl std_protos[] = {\n");
 147
 148   /* A hash table entry of 0 means "unused" so reserve it.  */
 149   fprintf (outf, "  {\"\", \"\", \"\", 0},\n");
 150   next_index = 1;
 151
 152   for (;;)
 153     {
 154       int c = skip_spaces (inf, ' ');
 155
 156       if (c == EOF)
 157         break;
 158       linebuf.ptr = linebuf.base;
 159       ungetc (c, inf);
 160       c = read_upto (inf, &linebuf, '\n');
 161       if (linebuf.base[0] == '#') /* skip cpp command */
 162         continue;
 163       if (linebuf.base[0] == '\0') /* skip empty line */
 164         continue;
 165
 166       if (! parse_fn_proto (linebuf.base, linebuf.ptr, &fn_decl))
 167         continue;
 168
 169       add_hash (fn_decl.fname);
 170
 171       fprintf (outf, "  {\"%s\", \"%s\", \"%s\", 0},\n",
 172                fn_decl.fname, fn_decl.rtype, fn_decl.params);
 173
 174       if (c == EOF)
 175         break;
 176     }
 177   fprintf (outf, "  {0, 0, 0, 0}\n};\n");
 178
 179
 180   fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);
 181   fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");
 182   for (i = 0; i < HASH_SIZE; i++)
 183     fprintf (outf, "  %d,\n", hash_tab[i]);
 184   fprintf (outf, "};\n");
 185
 186   fprintf (stderr, "gen-protos: %d entries %d collisions\n",
 187            next_index, collisions);
 188
 189   return 0;
 190 }