2 * Helpers for dealing with type specifiers.
3 * Copyright © 2011 Nick Bowler
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 * We can represent type specifiers as a bitmap, which gives us a finite
27 * list of acceptable bitmap values according to the C standard. However,
28 * the "long" specifier is allowed to occur more than once, but only at most
29 * 2 times. Treat it as a special case, assigning an unused bit to represent
32 #define CDECL_TYPE_LLONG (CDECL_SPEC_TYPE + 31)
34 static inline unsigned long spec_bit(unsigned type)
36 return 1ul << (type & (CDECL_SPEC_TYPE - 1));
39 static unsigned long add_typespec(unsigned long map, struct cdecl_declspec *s)
41 assert(s->type >= CDECL_SPEC_TYPE && s->type < CDECL_TYPE_LLONG);
43 if (s->type == CDECL_TYPE_LONG) {
44 if (map & spec_bit(CDECL_TYPE_LLONG)) {
45 fprintf(stderr, "too many long specifiers\n");
47 } else if (map & spec_bit(CDECL_TYPE_LONG)) {
48 return map | spec_bit(CDECL_TYPE_LLONG);
52 if (map & spec_bit(s->type)) {
53 fprintf(stderr, "duplicate type specifier\n");
57 return map | spec_bit(s->type);
60 unsigned long cdecl__build_typemap(struct cdecl_declspec *s)
62 unsigned long map = 0;
64 for (struct cdecl_declspec *c = s; c; c = c->next) {
65 if (cdecl_spec_kind(c) != CDECL_SPEC_TYPE)
68 map = add_typespec(map, c);
75 fprintf(stderr, "no type specifiers\n");
77 # include "validtypes.h"
80 fprintf(stderr, "conflicting type specifiers\n");