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/>.
25 * We can represent type specifiers as a bitmap, which gives us a finite
26 * list of acceptable bitmap values according to the C standard. However,
27 * the "long" specifier is allowed to occur more than once, but only at most
28 * 2 times. Treat it as a special case, assigning an unused bit to represent
31 #define CDECL_TYPE_LLONG 31
33 static unsigned long add_typespec(unsigned long map, struct cdecl_declspec *s)
35 if (s->type >= CDECL_TYPE_LLONG) {
36 fprintf(stderr, "invalid type specifier\n");
40 if (s->type == CDECL_TYPE_LONG) {
41 if (map & (1ul<<CDECL_TYPE_LLONG)) {
42 fprintf(stderr, "too many long specifiers\n");
44 } else if (map & (1ul<<CDECL_TYPE_LONG)) {
45 return map | (1ul<<CDECL_TYPE_LLONG);
49 if (map & (1ul<<s->type)) {
50 fprintf(stderr, "duplicate type specifier\n");
54 return map | (1ul<<s->type);
57 unsigned long cdecl__build_typemap(struct cdecl_declspec *s)
59 unsigned long map = 0;
61 for (struct cdecl_declspec *c = s; c; c = c->next) {
62 if (cdecl_spec_kind(c) != CDECL_SPEC_TYPE)
65 map = add_typespec(map, c);
72 fprintf(stderr, "no type specifiers\n");
74 # include "validtypes.h"
77 fprintf(stderr, "conflicting type specifiers\n");
82 const char *cdecl__explain_typemap(unsigned long map)
85 # include "typenames.h"
87 fprintf(stderr, "invalid type specifiers\n");