Hello all,
I've found a very small (but important) missing case in the modified
frontc parser used in CIL.
CIL is currently (as of most recent SVN) unable to correctly parse the
expression "0x1.p1". This is a hex float literal with no non-whole
part, where the whole part has a trailing period. CIL seems to parse
it as field membership:
int main(void){
double x = 0x1.p1;
printf("%f\n", x);
return 0;
}
$ cilly.asm.exe hexFloats.c
hexFloats.c:2: Error: Expected an lval in MEMBEROF (field p1)
The fix is very simple. The current production for hex fractions is:
let hexfraction = hexdigit* '.' hexdigit+ | hexdigit+
I think this should actually be:
let hexfraction = hexdigit* '.' hexdigit+ | hexdigit+ '.'
It seems as though "hexfraction = hexdigit+" is actually a duplicate case since:
let hexfloat = hexprefix hexfraction binexponent | hexprefix hexdigit+
binexponent
Thanks,
-Chucky Ellison
University of Illinois
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