[ast-optimizer-branch] simplifying C++

[Diego Novillo]

On Mon, 2002-06-17 at 12:31, Joseph S. Myers wrote:
> On 17 Jun 2002, Diego Novillo wrote:
> 
> > On Mon, 2002-06-17 at 12:07, Jason Merrill wrote:
> > > I've been thinking about simplifying C++, and the complex scoping that C++
> > > loops have.  In a for loop, a decl in the for-init-stmt is in scope for the
> > > duration of the loop; a decl in the condition is in scope within an
> > > iteration, goes out of scope, and back in.  The first can be dealt with
> > > simply by wrapping the loop in a scope.
> > >
> > Are these the same rules as for C99?  When I ran into this one last
> > week, the front end was already enclosing the loop in a scope, so the
> > simplifier didn't have to do much more than recognizing DECL_STMTs
> > inside FOR_INIT_STMT.
> 
> C99 doesn't allow decls in the condition (so just does need to enclose the
> loop in a scope - it's because these extra scopes are only applied in C99
> mode that this feature isn't accepted as an extension in gnu89 mode).
> 
I know.  I was referring to decls in FOR_INIT_STMT.  But in re-reading
my message I see that I didn't make that clear.  Sorry.


Diego.