Re: [RFC] Implementation of DW_OP_deref and DW_OP_deref_size operators

[Mark Kettenis <kettenis@chello.nl>]

   Sender: jimb@zwingli.cygnus.com
   Cc: gdb@sources.redhat.com, gdb-patches@sources.redhat.com
   From: Jim Blandy <jimb@redhat.com>
   Date: 04 Jul 2002 22:27:02 -0500
   User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1
   Content-Type: text/plain; charset=us-ascii


   Jim Blandy <jimb@redhat.com> writes:
   > Yes!  However, pointers are not always unsigned.  I think on some
   > 32-bit ABIs for 64-bit MIPS chips they need to be signed.  Andrew will
   > know the facts.

   But it doesn't matter whether pointers are unsigned.  The Dwarf spec
   says that DW_OP_deref pushes a value which is "the size of an address
   on the target machine", which is the full width of a Dwarf
   expression stack element; it doesn't need to be extended.  And it
   further says that DW_OP_deref_size zero-extends its argument.  So the
   patch looks correct to me.

Yup, I came to the same conclusion.  The code that was origionally
there also used unsigned pointers.

I'll check it in.

Thanks,

Mark