Support for "break *ADDRESS thread THREADNO"

[Eli Zaretskii]

> Date: Tue, 12 Apr 2005 14:13:34 -0400
> From: Daniel Jacobowitz <drow@false.org>
> Cc: gdb-patches@sources.redhat.com
> 
> > 2005-04-12  Maciej W. Rozycki  <macro@mips.com>
> > 
> > 	* ada-lex.l: Support the "thread THREADNO" clause with breakpoints
> > 	at an address.
> > 	* c-exp.y (yylex): Likewise.
> > 	* f-exp.y (yylex): Likewise.
> > 	* jv-exp.y (yylex): Likewise.
> > 	* m2-exp.y (yylex): Likewise.
> > 	* objc-exp.y (yylex): Likewise.
> > 	* p-exp.y (yylex): Likewise.
> > 
> >  This has been verified for the HEAD version with the test suite for the 
> > i386-linux-gnu system natively with no regressions.  Please consider.
> 
> No, sorry.  Consider:
> 
> (gdb) p *thread
> No symbol table is loaded.  Use the "file" command.
> 
> After your patch:
> 
> (gdb) b *thread
> A parse error in expression, near `thread'.
> 
> We can get away with this for 'if', because 'if' is a keyword in just
> about every language GDB supports, and an unlikely name for a variable.
> That's not going to fly for 'thread', however.

In addition to the above, I don't like the idea of supporting a
general feature in language-specific files.  That seems wrong.

Why was it done like this? because "*ADDRESS" is interpreted as an
expression in the current language, or is there some other reason?