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 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            PARAMS ((const char *));
  30 static int parse_fn_proto       PARAMS ((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 (fname)
  39      const char *fname;
  40 {
  41   int i, i0;
  42
  43   /* NOTE:  If you edit this, also edit lookup_std_proto in fix-header.c !! */
  44   i = hashstr (fname, strlen (fname)) % HASH_SIZE;
  45   i0 = i;
  46   if (hash_tab[i] != 0)
  47     {
  48       collisions++;
  49       for (;;)
  50         {
  51           i = (i+1) % HASH_SIZE;
  52           if (i == i0)
  53             abort ();
  54           if (hash_tab[i] == 0)
  55             break;
  56         }
  57     }
  58   hash_tab[i] = next_index;
  59
  60   next_index++;
  61 }
  62
  63 /* Given a function prototype, fill in the fields of FN.
  64    The result is a boolean indicating if a function prototype was found.
  65
  66    The input string is modified (trailing NULs are inserted).
  67    The fields of FN point to the input string.  */
  68
  69 static int
  70 parse_fn_proto (start, end, fn)
  71      char *start, *end;
  72      struct fn_decl *fn;
  73 {
  74   char *ptr;
  75   int param_nesting = 1;
  76   char *param_start, *param_end, *decl_start, *name_start, *name_end;
  77
  78   ptr = end - 1;
  79   while (*ptr == ' ' || *ptr == '\t') ptr--;
  80   if (*ptr-- != ';')
  81     {
  82       fprintf (stderr, "Funny input line: %s\n", start);
  83       return 0;
  84     }
  85   while (*ptr == ' ' || *ptr == '\t') ptr--;
  86   if (*ptr != ')')
  87     {
  88       fprintf (stderr, "Funny input line: %s\n", start);
  89       return 0;
  90     }
  91   param_end = ptr;
  92   for (;;)
  93     {
  94       int c = *--ptr;
  95       if (c == '(' && --param_nesting == 0)
  96         break;
  97       else if (c == ')')
  98         param_nesting++;
  99     }
 100   param_start = ptr+1;
 101
 102   ptr--;
 103   while (*ptr == ' ' || *ptr == '\t') ptr--;
 104
 105   if (!ISALNUM ((unsigned char)*ptr))
 106     {
 107       if (verbose)
 108         fprintf (stderr, "%s: Can't handle this complex prototype: %s\n",
 109                  progname, start);
 110       return 0;
 111     }
 112   name_end = ptr+1;
 113
 114   while (ISIDNUM (*ptr))
 115     --ptr;
 116   name_start = ptr+1;
 117   while (*ptr == ' ' || *ptr == '\t') ptr--;
 118   ptr[1] = 0;
 119   *param_end = 0;
 120   *name_end = 0;
 121
 122   decl_start = start;
 123   if (strncmp (decl_start, "typedef ", 8) == 0)
 124     return 0;
 125   if (strncmp (decl_start, "extern ", 7) == 0)
 126     decl_start += 7;
 127
 128   fn->fname = name_start;
 129   fn->rtype = decl_start;
 130   fn->params = param_start;
 131   return 1;
 132 }
 133
 134 extern int main PARAMS ((int, char **));
 135
 136 int
 137 main (argc, argv)
 138      int argc ATTRIBUTE_UNUSED;
 139      char **argv;
 140 {
 141   FILE *inf = stdin;
 142   FILE *outf = stdout;
 143   int i;
 144   sstring linebuf;
 145   struct fn_decl fn_decl;
 146
 147   i = strlen (argv[0]);
 148   while (i > 0 && argv[0][i-1] != '/') --i;
 149   progname = &argv[0][i];
 150
 151   INIT_SSTRING (&linebuf);
 152
 153   fprintf (outf, "struct fn_decl std_protos[] = {\n");
 154
 155   /* A hash table entry of 0 means "unused" so reserve it.  */
 156   fprintf (outf, "  {\"\", \"\", \"\", 0},\n");
 157   next_index = 1;
 158
 159   for (;;)
 160     {
 161       int c = skip_spaces (inf, ' ');
 162
 163       if (c == EOF)
 164         break;
 165       linebuf.ptr = linebuf.base;
 166       ungetc (c, inf);
 167       c = read_upto (inf, &linebuf, '\n');
 168       if (linebuf.base[0] == '#') /* skip cpp command */
 169         continue;
 170       if (linebuf.base[0] == '\0') /* skip empty line */
 171         continue;
 172
 173       if (! parse_fn_proto (linebuf.base, linebuf.ptr, &fn_decl))
 174         continue;
 175
 176       add_hash (fn_decl.fname);
 177
 178       fprintf (outf, "  {\"%s\", \"%s\", \"%s\", 0},\n",
 179                fn_decl.fname, fn_decl.rtype, fn_decl.params);
 180
 181       if (c == EOF)
 182         break;
 183     }
 184   fprintf (outf, "  {0, 0, 0, 0}\n};\n");
 185
 186
 187   fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);
 188   fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");
 189   for (i = 0; i < HASH_SIZE; i++)
 190     fprintf (outf, "  %d,\n", hash_tab[i]);
 191   fprintf (outf, "};\n");
 192
 193   fprintf (stderr, "gen-protos: %d entries %d collisions\n",
 194            next_index, collisions);
 195
 196   return 0;
 197 }