gcc/gen-protos.c

   1 /* gen-protos.c - massages a list of prototypes, for use by fixproto.
   2    Copyright (C) 1993, 94-96, 1998, 1999 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 #undef abort
  22
  23 int verbose = 0;
  24 const char *progname;
  25
  26 static void add_hash            PARAMS ((const char *));
  27 static int parse_fn_proto       PARAMS ((char *, char *, struct fn_decl *));
  28
  29 #define HASH_SIZE 2503 /* a prime */
  30 int hash_tab[HASH_SIZE];
  31 int next_index;
  32 int collisions;
  33
  34 static void
  35 add_hash (fname)
  36      const char *fname;
  37 {
  38   int i, i0;
  39
  40   /* NOTE:  If you edit this, also edit lookup_std_proto in fix-header.c !! */
  41   i = hashstr (fname, strlen (fname)) % HASH_SIZE;
  42   i0 = i;
  43   if (hash_tab[i] != 0)
  44     {
  45       collisions++;
  46       for (;;)
  47         {
  48           i = (i+1) % HASH_SIZE;
  49           if (i == i0)
  50             abort ();
  51           if (hash_tab[i] == 0)
  52             break;
  53         }
  54     }
  55   hash_tab[i] = next_index;
  56
  57   next_index++;
  58 }
  59
  60 /* Given a function prototype, fill in the fields of FN.
  61    The result is a boolean indicating if a function prototype was found.
  62
  63    The input string is modified (trailing NULs are inserted).
  64    The fields of FN point to the input string.  */
  65
  66 static int
  67 parse_fn_proto (start, end, fn)
  68      char *start, *end;
  69      struct fn_decl *fn;
  70 {
  71   register 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 (ISALNUM ((unsigned char)*ptr) || *ptr == '_') --ptr;
 112   name_start = ptr+1;
 113   while (*ptr == ' ' || *ptr == '\t') ptr--;
 114   ptr[1] = 0;
 115   *param_end = 0;
 116   *name_end = 0;
 117
 118   decl_start = start;
 119   if (strncmp (decl_start, "typedef ", 8) == 0)
 120     return 0;
 121   if (strncmp (decl_start, "extern ", 7) == 0)
 122     decl_start += 7;
 123
 124   fn->fname = name_start;
 125   fn->rtype = decl_start;
 126   fn->params = param_start;
 127   return 1;
 128 }
 129
 130 extern int main PARAMS ((int, char **));
 131
 132 int
 133 main (argc, argv)
 134      int argc ATTRIBUTE_UNUSED;
 135      char **argv;
 136 {
 137   FILE *inf = stdin;
 138   FILE *outf = stdout;
 139   int i;
 140   sstring linebuf;
 141   struct fn_decl fn_decl;
 142
 143   i = strlen (argv[0]);
 144   while (i > 0 && argv[0][i-1] != '/') --i;
 145   progname = &argv[0][i];
 146
 147   INIT_SSTRING (&linebuf);
 148
 149   fprintf (outf, "struct fn_decl std_protos[] = {\n");
 150
 151   /* A hash table entry of 0 means "unused" so reserve it.  */
 152   fprintf (outf, "  {\"\", \"\", \"\", 0},\n");
 153   next_index = 1;
 154
 155   for (;;)
 156     {
 157       int c = skip_spaces (inf, ' ');
 158
 159       if (c == EOF)
 160         break;
 161       linebuf.ptr = linebuf.base;
 162       ungetc (c, inf);
 163       c = read_upto (inf, &linebuf, '\n');
 164       if (linebuf.base[0] == '#') /* skip cpp command */
 165         continue;
 166       if (linebuf.base[0] == '\0') /* skip empty line */
 167         continue;
 168
 169       if (! parse_fn_proto (linebuf.base, linebuf.ptr, &fn_decl))
 170         continue;
 171
 172       add_hash (fn_decl.fname);
 173
 174       fprintf (outf, "  {\"%s\", \"%s\", \"%s\", 0},\n",
 175                fn_decl.fname, fn_decl.rtype, fn_decl.params);
 176
 177       if (c == EOF)
 178         break;
 179     }
 180   fprintf (outf, "  {0, 0, 0, 0}\n};\n");
 181
 182
 183   fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);
 184   fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");
 185   for (i = 0; i < HASH_SIZE; i++)
 186     fprintf (outf, "  %d,\n", hash_tab[i]);
 187   fprintf (outf, "};\n");
 188
 189   fprintf (stderr, "gen-protos: %d entries %d collisions\n",
 190            next_index, collisions);
 191
 192   return 0;
 193 }
 194
 195 /* Needed by scan.o.  We can't use libiberty here.  */
 196 PTR
 197 xrealloc (p, s)
 198      PTR p;
 199      size_t s;
 200 {
 201   PTR r;
 202   if (s == 0)
 203     s = 1;
 204   if (p)
 205     r = realloc (p, s);
 206   else
 207     r = malloc (s);
 208   if (!r)
 209     abort ();
 210   return r;
 211 }