Re: [RFA] Limited DW_OP_piece support

[Andrew Cagney <ac131313@redhat.com>]

> On May 22,  1:53pm, Andrew Cagney wrote:
> 
> 
>> > The patch below adds limited DW_OP_piece support to dwarf2expr.c.  I
>> > will post a patch to rs6000-tdep.c which illustrates what a
>> > ``dwarf2_compose_register_pieces'' method should look like.
> 
>> 
>> I think GDB needs to just learn about location lists :-/
> 
> 
> It certainly should, but I fail to see how that relates to the
> addition of DW_OP_piece support to GDB's DWARF 2 location expression
> evaluator.  I think that what you meant to say is that GDB should
> fully (and generically) support arbitrary location expressions. 
> (Remember that the term "location list" is used to describe objects
> whose location changes during its lifetime.)

Yes, too many context sensative terms.  A list of sub-locations.

Given a ``struct value'', the [list of] sub-locations (pieces?) that 
describe how to find that values raw bytes.

Andrew


> BTW, I notice that I forgot the ChangeLog entries for my patch.  Here
> they are:
> 
> 	* dwarf2expr.c (execute_stack_op): Add limited DW_OP_piece support.
> 	* gdbarch.sh (dwarf2_compose_register_pieces): New method.
> 	* gdbarch.c, gdbarch.h: Regenerate.
> 
> Kevin
>