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Date: Tue, 17 Sep 2002 10:54:00 -0000
From: Andrew Cagney <ac131313@ges.redhat.com>
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To: Daniel Jacobowitz <drow@mvista.com>
Cc: David Carlton <carlton@math.stanford.edu>,
	gdb <gdb@sources.redhat.com>
Subject: Re: struct environment
References: <ro1lm6gcg9r.fsf@jackfruit.Stanford.EDU> <3D86DE18.6030003@ges.redhat.com> <20020917134057.GA26237@nevyn.them.org> <3D875149.9080502@ges.redhat.com> <20020917160700.GA20451@nevyn.them.org>
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> Well, sort of.  It won't be a DAG necessarily (I think that mutual
>> >"using" statements are legal in C++; I remember a GCC bug involving
>> >them was fixed not long ago), and it will be somewhat complicated
>> >figuring out which ones to look up (namespace links are different than
>> >block scope links).
> 
>> 
>> Don't forget that GDB doesn't need to model the language.  Just the 
>> namespace behavior at a given PC.  The effect of "using" would be to 
>> just grow a nametab in someway.
> 
> 
> This is legal C++:
> 
> namespace D {}
> 
> namespace C { 
>   using namespace D;
>   int x, y;
> }
> 
> namespace D {
>   using namespace C;
>   int x, z;
> }
> 
> If using just grew a nametab we'd get into a great deal of trouble.

Depends on how you grow it :-)  Something like (assuming a real language 
:-):
	D:
	0: x, z
	1: x, y (from C)
	2: ...

Andrew