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
  24 int verbose = 0;
  25 char *progname;
  26
  27 #define HASH_SIZE 2503 /* a prime */
  28 int hash_tab[HASH_SIZE];
  29 int next_index;
  30
  31 static void
  32 add_hash (fname)
  33      char *fname;
  34 {
  35   int i, i0;
  36
  37   /* NOTE:  If you edit this, also edit lookup_std_proto in fix-header.c !! */
  38   i = hashf (fname, strlen (fname), HASH_SIZE);
  39   i0 = i;
  40   if (hash_tab[i] != 0)
  41     {
  42       for (;;)
  43         {
  44           i = (i+1) % HASH_SIZE;
  45           if (i == i0)
  46             abort ();
  47           if (hash_tab[i] == 0)
  48             break;
  49         }
  50     }
  51   hash_tab[i] = next_index;
  52
  53   next_index++;
  54 }
  55
  56 /* Given a function prototype, fill in the fields of FN.
  57    The result is a boolean indicating if a function prototype was found.
  58
  59    The input string is modified (trailing NULs are inserted).
  60    The fields of FN point to the input string.  */
  61
  62 static int
  63 parse_fn_proto (start, end, fn)
  64      char *start, *end;
  65      struct fn_decl *fn;
  66 {
  67   register char *ptr;
  68   int param_nesting = 1;
  69   char *param_start, *param_end, *decl_start, *name_start, *name_end;
  70
  71   ptr = end - 1;
  72   while (*ptr == ' ' || *ptr == '\t') ptr--;
  73   if (*ptr-- != ';')
  74     {
  75       fprintf (stderr, "Funny input line: %s\n", start);
  76       return 0;
  77     }
  78   while (*ptr == ' ' || *ptr == '\t') ptr--;
  79   if (*ptr != ')')
  80     {
  81       fprintf (stderr, "Funny input line: %s\n", start);
  82       return 0;
  83     }
  84   param_end = ptr;
  85   for (;;)
  86     {
  87       int c = *--ptr;
  88       if (c == '(' && --param_nesting == 0)
  89         break;
  90       else if (c == ')')
  91         param_nesting++;
  92     }
  93   param_start = ptr+1;
  94
  95   ptr--;
  96   while (*ptr == ' ' || *ptr == '\t') ptr--;
  97
  98   if (!ISALNUM ((unsigned char)*ptr))
  99     {
 100       if (verbose)
 101         fprintf (stderr, "%s: Can't handle this complex prototype: %s\n",
 102                  progname, start);
 103       return 0;
 104     }
 105   name_end = ptr+1;
 106
 107   while (ISALNUM ((unsigned char)*ptr) || *ptr == '_') --ptr;
 108   name_start = ptr+1;
 109   while (*ptr == ' ' || *ptr == '\t') ptr--;
 110   ptr[1] = 0;
 111   *param_end = 0;
 112   *name_end = 0;
 113
 114   decl_start = start;
 115   if (strncmp (decl_start, "typedef ", 8) == 0)
 116     return 0;
 117   if (strncmp (decl_start, "extern ", 7) == 0)
 118     decl_start += 7;
 119
 120   fn->fname = name_start;
 121   fn->rtype = decl_start;
 122   fn->params = param_start;
 123   return 1;
 124 }
 125
 126 int
 127 main (argc, argv)
 128      int argc ATTRIBUTE_UNUSED;
 129      char **argv;
 130 {
 131   FILE *inf = stdin;
 132   FILE *outf = stdout;
 133   int i;
 134   sstring linebuf;
 135   struct fn_decl fn_decl;
 136
 137   i = strlen (argv[0]);
 138   while (i > 0 && argv[0][i-1] != '/') --i;
 139   progname = &argv[0][i];
 140
 141   INIT_SSTRING (&linebuf);
 142
 143   fprintf (outf, "struct fn_decl std_protos[] = {\n");
 144
 145   /* A hash table entry of 0 means "unused" so reserve it.  */
 146   fprintf (outf, "  {\"\", \"\", \"\", 0},\n");
 147   next_index = 1;
 148
 149   for (;;)
 150     {
 151       int c = skip_spaces (inf, ' ');
 152
 153       if (c == EOF)
 154         break;
 155       linebuf.ptr = linebuf.base;
 156       ungetc (c, inf);
 157       c = read_upto (inf, &linebuf, '\n');
 158       if (linebuf.base[0] == '#') /* skip cpp command */
 159         continue;
 160       if (linebuf.base[0] == '\0') /* skip empty line */
 161         continue;
 162
 163       if (! parse_fn_proto (linebuf.base, linebuf.ptr, &fn_decl))
 164         continue;
 165
 166       add_hash (fn_decl.fname);
 167
 168       fprintf (outf, "  {\"%s\", \"%s\", \"%s\", 0},\n",
 169                fn_decl.fname, fn_decl.rtype, fn_decl.params);
 170
 171       if (c == EOF)
 172         break;
 173     }
 174   fprintf (outf, "  {0, 0, 0, 0}\n};\n");
 175
 176
 177   fprintf (outf, "#define HASH_SIZE %d\n", HASH_SIZE);
 178   fprintf (outf, "short hash_tab[HASH_SIZE] = {\n");
 179   for (i = 0; i < HASH_SIZE; i++)
 180     fprintf (outf, "  %d,\n", hash_tab[i]);
 181   fprintf (outf, "};\n");
 182
 183   return 0;
 184 }
 185
 186 /* Avoid error if config defines abort as fancy_abort.
 187    It's not worth "really" implementing this because ordinary
 188    compiler users never run fix-header.  */
 189
 190 void
 191 fancy_abort ()
 192 {
 193   abort ();
 194 }
 195
 196 void
 197 fatal (s)
 198      char *s;
 199 {
 200   fprintf (stderr, "%s: %s\n", "gen-protos", s);
 201   exit (FATAL_EXIT_CODE);
 202 }