Hello, everybody!

Please, explain me, why FASMW just falls when compiling this code:

macro PowerOf2 value
{
power_of_2 = 0
range = 1
enable_getpower_of_2
getpower_of_2 value
purge getpower_of_2
display 'power of 2 = ',power_of_2+48,13,10
display 'range = ',range+48,13,10
}

macro enable_getpower_of_2
{
macro getpower_of_2 value
_open
if (range < value)
power_of_2 = power_of_2 + 1
range = range * 2
enable_getpower_of_2
getpower_of_2 value
purge getpower_of_2
end if
_close
}

_open fix {
_close fix }

PowerOf2 6

Is it because IF compiled after macro expansion -> unlimited recursion?

Thanks.

Yes, exactly. You've got the infinite recursion and this causes the stack overflow - the result may vary depending on how your operating system handles stack overflows, since fasm interfaces currently don't do own exception handling.