[erlang-questions] Help: What's the correct way to add new BIFs?
Mon Mar 10 15:04:10 CET 2008
Thank you for the help.
I will put guard BIFs on hold :-)
> G Bulmerwrites:
>>> You should use bif; ubifs are only for guard BIFs.
>> Thank you. That clears that up.
>> I would like to make the two predicates (is_dtrace_on/0 and
>> is_dtrace_off/0 ) available in guard expressions.
>> I have them in bif.tab as:
>> ubif erlang:is_dtrace_on/0
>> ubif erlang:is_dtrace_off/0
> Creating a new guard BIF is a lot harder than creating an ordinary
> so I suggest you'll wait with doing that.
> The reason for the difficulties is that guard BIFs are specially
> optimized and
> each BIF that can be used in guard must have corresponding BEAM
> the new instructions must be supported in both the compiler and the
That sounds non-trivial !-)
I'll skip that for now.
> Björn Gustavsson, Erlang/OTP, Ericsson AB
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