[erlang-questions] A few type-related 18.0 questions

Olivier BOUDEVILLE olivier.boudeville@REDACTED
Fri Jul 17 18:01:52 CEST 2015

Hello Tuncer,


> Are you saying that
> (1) because the module doesn't exist as a .beam file Dialyzer doesn't
> know of its existence

In this particular case, the generated module exists neither as a source 
file (.erl) nor as a compiled one (.beam), as it exists only at runtime 
and in-memory - so I do not think Dialyzer has any chance to be aware of 
it and of its actual content (exports)?

> (2) and there's no way to make the ephemeral/volatile module known to
> Dialyzer as part of the analysis call
> ?

Ah, maybe there is such a solution that I am not aware of, but apart from 
running a Dialyzer attached to the application (a bit like an attached 
gdb), I do not think Dialyzer can do much there. So I was looking for a 
way to silence it whenever it saw calls from anywhere in the code to any 
function defined in these pseudo-modules.

To clarify the use case, this pseudo-module generation serves to create 
efficient look-up tables of immutable data that is known only at runtime 
(ex: after having read a data file).

Have a nice week-end!



> > In this case I do not think we can tell Dialyzer to suppress this
> > warning (since the -dialyzer attribute seems to be meant to be used
> > in the sources *of the module itself*, i.e. it would have here to be
> > specified in the sourceless M2).
> >
> > This is not a big issue (and these are edges cases indeed), but it
> > would be interesting if we could define 'global' suppressions, or
> > that would apply to a set of modules (similarly, Dialyzer would not
> > be able to see that conditional calls could be done based on the
> > actual availability of the exported function - using module_info/1
> > for that; Dialyzer would then detect a potential call to a
> > non-existing function, it would be neat if we could specify that
> > these warnings should be suppressed as we know that this cannot
> > happen).

Olivier Boudeville

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