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/>.
24 * We can represent type specifiers as a bitmap, which gives us a finite
25 * list of acceptable bitmap values according to the C standard. However,
26 * the "long" specifier is allowed to occur more than once, but only at most
27 * 2 times. Treat it as a special case, assigning an unused bit to represent
30 #define CDECL_TYPE_LLONG 31
32 static unsigned long add_typespec(unsigned long map, struct cdecl_declspec *s)
34 if (s->type >= CDECL_TYPE_LLONG) {
35 fprintf(stderr, "invalid type specifier\n");
39 if (s->type == CDECL_TYPE_LONG) {
40 if (map & (1ul<<CDECL_TYPE_LLONG)) {
41 fprintf(stderr, "too many long specifiers\n");
43 } else if (map & (1ul<<CDECL_TYPE_LONG)) {
44 return map | (1ul<<CDECL_TYPE_LLONG);
48 if (map & (1ul<<s->type)) {
49 fprintf(stderr, "duplicate type specifier\n");
53 return map | (1ul<<s->type);
56 unsigned long cdecl__build_typemap(struct cdecl_declspec *s)
58 unsigned long map = 0;
60 for (struct cdecl_declspec *c = s; c; c = c->next) {
61 if (cdecl_spec_kind(c) != CDECL_SPEC_TYPE)
64 map = add_typespec(map, c);
71 fprintf(stderr, "no type specifiers\n");
73 # include "validtypes.h"
76 fprintf(stderr, "conflicting type specifiers\n");
81 const char *cdecl__explain_typemap(unsigned long map)
84 # include "typenames.h"
86 fprintf(stderr, "invalid type specifiers\n");