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
4This program is free software; you can redistribute it and/or modify it
5under the terms of the GNU General Public License as published by the
6Free Software Foundation; either version 2, or (at your option) any
7later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12GNU General Public License for more details.
13
14You should have received a copy of the GNU General Public License
15along with this program; if not, write to the Free Software
16Foundation, 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
25int verbose = 0;
26char *progname;
27
28#define HASH_SIZE 2503 /* a prime */
29int hash_tab[HASH_SIZE];
30int next_index;
31
32static void
33add_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
63static int
64parse_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
127int
128main (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}
186