------- Additional Comments From dberlin at gcc dot gnu dot org 2005-09-28
02:31 -------
Subject: Re: [4.1 Regression] C++ generates incorrect
overlapping fields
On Wed, 2005-09-28 at 02:06 +0000, mark at codesourcery dot com wrote:
> ------- Additional Comments From mark at codesourcery dot com 2005-09-28
> 02:06 -------
> Subject: Re: [4.1 Regression] C++ generates incorrect overlapping
> fields
>
> dberlin at gcc dot gnu dot org wrote:
>
> > However, the questions still remains, what is the offset supposed to be
> > relative to?
>
> The beginning of the type in which the field is contained, which I think
> means, in your parlance:
The parlance is that of GCC. I didn't invent DECL_CONTEXT :)
>
> > The direct context, or the outermost containing type?
>
> the "direct context".
Okay, then this is my bug, not yours :)
I'll change the summary in a moment.
>
> In other words, if C has a field of type B at offset 32, and B has an
> field "f" with offset 16, then the offset of B::f relative to C is 48.
> (That's the only thing that makes any sense; otherwise, we'd have to
> make a copy of B every time it appeared as field in some other type.)
Well, yes, if you link everything together using a list like that, and
only store the offset in a shared field decl.
But if you had a nice vector of std::pair<offset, field>, you wouldn't
have to copy everything. :)
>
>
>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22488
