[MI] -file-list-exec-source-files

[Andrew Cagney]

>> >2. -file-list-exec-fetch-fullname [filename]
>> >
>> >   This will be a new MI command.
>> >
>> >   This will return a fullname given a filename.
>> >   If the symtab is read in, it calls source.c:symtab_to_filename.
>> >   If the symtab is not read in, it reads it in and calls the above
>> >   function.
>> >
>> >   This function is necessary because all of the other MI commands still
>> >   output just the filename and not the fullname. For example, breakpoints,
>> >   stack, ...
> 
> 
> Yes, I guess it's a bug. However, these commands have never returned the 
> fullname. 

That's cos no one thought to point out the bug :-(

> Here you are making a big change to the way GDB deals with front ends.
> You are saying that GDB should only let the front end know about
> fullnames, and know nothing about filenames.

Both:

	filename=...,fullname=...

should be output.  That's where MI is ment to be upward compatible.

> I consider this desirable as a front end writer, since the fullname is
> the only valid unique key to a front end.
> 
> It would be nice if I could do this in 2 phase's. 
> First add this function, for backwards compatibility, and then, change
> all the existing commands to return fullnames.

I'd just fix the commands as each causes a problem as otherwize ...

> Although, leaving this function around, doesn't hurt anything.

... GDB would end up having to support that command :-(

>> >3. -file-list-exec-source-files [force_fullnames]
>> >
>> >   This will implement an existing unimplemented MI command.
>> >
>> >   By default, this will return 
>> >   1. filename for each psymtab, with no fullname
>> >   2. filename/fullname for each symtab
>> >
>> >   If the option "force_fullnames" is passed, it will have GDB convert all
>> >   of the psymtabs to symtabs, thus printing out the filename/fullname for 
>> >   all symtabs. The overhead of doing this is probably high, and
>> >   undesirable by default.
>> >
>> >   If the front end wants to be more efficient, it could show the user the
>> >   "filenames" and then do the "fullname" lookup just on that file. Thus,
>> >   only reading in one symtab.
> 
>> 
>> This specification is too heavily dependent on GDB's current underlying 
>> implementation - symtab and psymtab are internal details and do not 
>> belong in this interface specification.
> 
> 
> I was just showing how this interface is affected by GDB's
> implementation of psymtab/symtab. The user will have no idea of these 2
> concepts.
> 
> Anyways, if I can get the dirname into psymtab, this will no longer be an 
> issue. The user will always get the filename/fullname combo.
> 
> With that said, do you like the implementation?

I've not looked at it in detail.

Andrew