[bfd] RFC: support to get data from import/export tables [especially PE files]

[Nick Clifton]

Hi Jakub,

> I've got question how to introduce new functions in bfd.
> I haven't seen any doc about it.

The code is the documentation. :-)  OK, so that is not the greatest situation, 
but it is basically true.  There is a file bfd/doc/bfdint.texi which you ought 
to look at.  Plus of course familiarity with how bfd works helps a lot.


> +.#define BFD_JUMP_TABLE_IMPORT(NAME) \
> +.  NAME##_imports_get_shared_objects, \
> +.  NAME##_imports_get, \

>  maybe instead of creating new BFD_JUMP_TABLE() 
>  I've should add these function to BFD_JUMP_TABLE() which already exists?)

No, it is best to keep this new functionality separate and have a new jump table.

> and than in each declared bfd_target 
> I should do:
>  BFD_JUMP_TABLE_IMPORT(_bfd_noimports) when i don't implement support for it.
> and BFD_JUMP_TABLE_IMPORT(mytarget) when I implement support for it?

Yes, although you can ease this somewhat by providing a default definition in 
elfxx-target.h, so that you do not have to handle every ELF based target 
separately.

> [these _bfd_noimports_* function SHOULD exists or they could be macros
> to bfd_true() bfd_false() or bfd_nullvoidptr() with typecast?
> Where I should define them?]

In bfd.c

> Am I right?

Spot on. :-)

Cheers
   Nick