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Re: DWARF-2 and address sizes
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: Daniel Berlin <dberlin at dberlin dot org>
- Cc: Andrew Cagney <ac131313 at redhat dot com>, gdb at sources dot redhat dot com,Jim Blandy <jimb at redhat dot com>, Kevin Buettner <kevinb at redhat dot com>
- Date: Sat, 1 Feb 2003 12:01:52 -0500
- Subject: Re: DWARF-2 and address sizes
- References: <20030131223639.GA3585@nevyn.them.org> <3B43101B-35AD-11D7-AA6D-000393575BCC@dberlin.org>
On Sat, Feb 01, 2003 at 01:20:17AM -0500, Daniel Berlin wrote:
> On Friday, January 31, 2003, at 05:36 PM, Daniel Jacobowitz wrote:
> >On Fri, Jan 31, 2003 at 04:59:56PM -0500, Andrew Cagney wrote:
> >>>[Kevin, I noticed you doing some work in this area re S/390, maybe
> >>>got a comment? Anyone else? I'm grasping at straws.]
> >>>I'm trying to figure out how to handle addresses in the DWARF
> >>>evaluator. First consider DW_OP_deref: the following data is "the
> >>>size of
> >>>an address on the target machine", which I would personally take to
> >>>cu_header->addr_size. Is this ever different from
> >>>TARGET_ADDRESS_BIT /
> >>>TARGET_CHAR_BIT, which is what Daniel was originally using?
> >>I can imagine architectures wack-o enough for cu_header->addr_size !=
> >>TARGET_ADDRESS_BIT / TARGET_CHAR_BIT. Someone doing a 16 bit port
> >>32 bit elf.
> >I'm willing to document this as an assertion, store the dwarf2 address
> >size and signedness somewhere global, and bail if I detect a violation.
> >But I'll skip that for now; it can be a later cleanup. I've already
> >got too many pieces in this patch.
> IIRC, I did it some *other* way, and Jim told me to do it with the way
> there now.
> Or is that the other way around (He told me to do it some other way,
> rather than what's there now, and i never got to it).
> I believe I used to use one of the length of one of builtin types, and
> he told me to use TARGET_ADDRESS_BIT / TARGET_CHAR_BIT.
> The archives should say.
Hmm, I didn't see it in the archives, so maybe I need to look further
back. I'll check again.
Jim, I don't suppose you remember?
MontaVista Software Debian GNU/Linux Developer