Re: macros, debug information, and parse_macro_definition

[Daniel Berlin <dberlin@dberlin.org>]

On Tuesday, April 29, 2003, at 12:16  PM, Keith Walker wrote:

> At 11:55 29/04/2003 -0400, Daniel Berlin wrote:
>> It's trivial to do macro information compression, unlike normal 
>> dwarf2 info compression, because the macro info has no references. It 
>> is what it is.  With a smart algorithm (it's a bit tricky to keep the 
>> semantics the same after merging all the macro infos), you could 
>> simply take all the macro infos, merge them, make one macro info, and 
>> point all the debug sections at it.
>> I think, anyway.
>
> I'm not sure whether your comment is about macro info in general or 
> about macro info in DWARF2.
>
> Unfortunately, for DWARF2 debugging information, I don't think it is 
> quite so easy in that the macro information can include file start/end 
> entries which refer to file entries in the associated line number 
> information -
I'm aware, i wrote GCC's DWARF2 macro info support.
:)

> so you would also have to do something about merging the line number 
> tables as well;
This is also trivial, since it's just going to require updating an 
attribute on all the DIEs, not moving/removing DIE's (which is the only 
real thing that generates problems in merging DWARF2 info).

>  and hence update all other entries that refer to the file entries.
Still trivial compared to what you have to do for DWARF2 info in 
general.

>
> Keith
>