symbol.c revision 178826 
1/*
2 * Copyright (c) 1997 - 2005 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "gen_locl.h"
35#include "lex.h"
36
37RCSID("$Id: symbol.c 15617 2005-07-12 06:27:42Z lha $");
38
39static Hashtab *htab;
40
41static int
42cmp(void *a, void *b)
43{
44    Symbol *s1 = (Symbol *) a;
45    Symbol *s2 = (Symbol *) b;
46
47    return strcmp(s1->name, s2->name);
48}
49
50static unsigned
51hash(void *a)
52{
53    Symbol *s = (Symbol *) a;
54
55    return hashjpw(s->name);
56}
57
58void
59initsym(void)
60{
61    htab = hashtabnew(101, cmp, hash);
62}
63
64
65void
66output_name(char *s)
67{
68    char *p;
69
70    for (p = s; *p; ++p)
71	if (*p == '-')
72	    *p = '_';
73}
74
75Symbol *
76addsym(char *name)
77{
78    Symbol key, *s;
79
80    key.name = name;
81    s = (Symbol *) hashtabsearch(htab, (void *) &key);
82    if (s == NULL) {
83	s = (Symbol *) emalloc(sizeof(*s));
84	s->name = name;
85	s->gen_name = estrdup(name);
86	output_name(s->gen_name);
87	s->stype = SUndefined;
88	hashtabadd(htab, s);
89    }
90    return s;
91}
92
93static int
94checkfunc(void *ptr, void *arg)
95{
96    Symbol *s = ptr;
97    if (s->stype == SUndefined) {
98	error_message("%s is still undefined\n", s->name);
99	*(int *) arg = 1;
100    }
101    return 0;
102}
103
104int
105checkundefined(void)
106{
107    int f = 0;
108    hashtabforeach(htab, checkfunc, &f);
109    return f;
110}
111