[erlang-questions] Dialyzer type/spec info question

Robert Virding <>
Mon Nov 17 17:11:13 CET 2014

>From where does it get it if I have .erl files as input? From the AST as
well? Do you know if there is any difference in the data itself between the
AST and core? I am guessing not but want to check. If there is no
difference then the info could be gotten from Core. This would make it
easier to use dialyzer together with LFE.


On 17 November 2014 17:03, Stavros Aronis <> wrote:

> Hi Robert,
> Dialyzer gets this info from beam_lib:chunks(File, [abstract_code]) which
> corresponds to the AST and is included in beam files if +debug_info is used
> while compiling.
> To my knowledge there is no reason to not let sources be combined (except
> perhaps when building a PLT), but the implementation seems to require
> uniformity.
> Relevant functions:
> dialyzer_utils:get_abstract_code_from_{src,beam}/{1,2}, get_spec_info/3,
> get_record_and_type_info/1.
> Regards,
> Stavros
> On Mon, Nov 17, 2014 at 4:53 PM, Robert Virding <>
> wrote:
>> From where does dialyzer get the user added type and spec info? From the
>> AST, or from Core erlang which contains the same type/spec data? And why?
>> Can I control it?
>> An extra question: why doesn't dialyzer allow me to mix input from both
>> .erl and .beam files? Or does it and I have missed that?
>> Robert
>> _______________________________________________
>> erlang-questions mailing list
>> http://erlang.org/mailman/listinfo/erlang-questions
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