/*
* Helpers for dealing with type specifiers.
* Copyright © 2011 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#include
#include
#include
#include
#include "cdecl.h"
#include "typemap.h"
/*
* We can represent type specifiers as a bitmap, which gives us a finite
* list of acceptable bitmap values according to the C standard. However,
* the "long" specifier is allowed to occur more than once, but only at most
* 2 times. Treat it as a special case, assigning an unused bit to represent
* the second long.
*/
#define CDECL_TYPE_LLONG (CDECL_SPEC_TYPE + 31)
static inline unsigned long spec_bit(unsigned type)
{
return 1ul << (type & (CDECL_SPEC_TYPE - 1));
}
static unsigned long add_typespec(unsigned long map, struct cdecl_declspec *s)
{
assert(s->type >= CDECL_SPEC_TYPE && s->type < CDECL_TYPE_LLONG);
if (s->type == CDECL_TYPE_LONG) {
if (map & spec_bit(CDECL_TYPE_LLONG)) {
fprintf(stderr, "too many long specifiers\n");
return -1;
} else if (map & spec_bit(CDECL_TYPE_LONG)) {
return map | spec_bit(CDECL_TYPE_LLONG);
}
}
if (map & spec_bit(s->type)) {
fprintf(stderr, "duplicate type specifier\n");
return -1;
}
return map | spec_bit(s->type);
}
unsigned long cdecl__build_typemap(struct cdecl_declspec *s)
{
unsigned long map = 0;
for (struct cdecl_declspec *c = s; c; c = c->next) {
if (cdecl_spec_kind(c) != CDECL_SPEC_TYPE)
continue;
map = add_typespec(map, c);
if (map == -1)
return -1;
}
switch (map) {
case 0:
fprintf(stderr, "no type specifiers\n");
return -1;
# include "validtypes.h"
return map;
default:
fprintf(stderr, "conflicting type specifiers\n");
return -1;
}
}