[erlang-questions] how: Getting -export_type information at run time?

Bengt Kleberg bengt.kleberg@REDACTED
Fri Apr 10 10:25:17 CEST 2015

When I use beam_lib:chunks/2 I get tuples that are easy to identity as 
type information(*).
When I turn the chunks into an abstract tree I do not understand how to 
find the type info any more. How should a fun for erl_syntax_lib:fold/3 
look, to identify the type information nodes?


On 04/10/2015 08:41 AM, Vlad Dumitrescu wrote:
> Hi Bengt,
> You have to extract this information from beam_lib:chunks(BEAM, 
> [abstract_code]) by means of erl_syntax_lib:fold/3 to keep only the 
> typespecs. It would be nice to have a higher-level library that gives 
> access to these internals.
> regards,
> Vlad
> On Fri, Apr 10, 2015 at 8:23 AM, Bengt Kleberg 
> <bengt.kleberg@REDACTED <mailto:bengt.kleberg@REDACTED>> wrote:
>     Greetings,
>     How do I find type information at run time?
>     A very nice Erlang module takes an options list. The options are
>     -type defined and -export_type'ed.
>     How do another module get that information during run time?
>     I thought that it might be in very_nice:module_info(attributes),
>     but no luck.
>     bengt
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