Patch implementing GDB/MI -symbol-info-symbol command

[Lluis <xscript at gmx dot net>]

Hello all,

Attached is a patch implementing the GDB/MI command '-symbol-info-symbol', 
but a few words are to be said about it:

- I'm not sure if I did all the memory management right (aka, the gdb way)

- If no symbol is found by that address, an error is thrown (but it could 
  return an empty result list otherwise, as you wish, although I've used 
  the same behaviour that the "info symbol" command has)

- I've turned a pair of "special" conditions from the original "info 
  symbol" command to errors, as I'm not sure of what should they output 
  ("load address range of" & "{mapped,unmapped} overlay")

- The output is first precalculated, saving it on xrealloc'ed memory, to be 
  able to first output a counter of the number of results (followed by a 
  list of the results, as you can see on the doc example), if this counter 
  is not found to be usefull, it can be thrown away and the command should 
  be a little faster

- I'm not sure if, in case of error, I have to use the error() function, or 
  the mi_error_message + return form (this is the one I've taken, like in 
  mi-main.c)

- I'm not sure if the error messages should be translatable or not

Well, I think that's all I had to say, if you have any comments or 
corrections, please send a mail directly to me, as I'm not subscribed to 
this list.

Thanks,
  Lluis

-- 
 "And it's much the same thing with knowledge, for whenever you learn
 something new, the whole world becomes that much richer."
 -- The Princess of Pure Reason, as told by Norton Juster in The Phantom
 Tollbooth

Attachment: symbol-info-symbol.patch
Description: Text document