[erlang-questions] Dialyzer type/spec info question

Stavros Aronis <>
Mon Nov 17 17:03:39 CET 2014

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

Relevant functions: dialyzer_utils:get_abstract_code_from_{src,beam}/{1,2},
get_spec_info/3, get_record_and_type_info/1.



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
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