> -Original Message-
> From: Dwarf-Discuss On Behalf
> Of Adrian Prantl via Dwarf-Discuss
> Sent: Friday, March 20, 2020 1:29 PM
> To: Michael Eager
> Cc: dwarf-discuss@lists.dwarfstd.org
> Subject: Re: [Dwarf-Discuss] Use of Location Description operations in
> DWARF Expressions?
>
>
On 3/23/20 6:28 AM, Robinson, Paul via Dwarf-Discuss wrote:
From: Dwarf-Discuss On Behalf
Of Adrian Prantl via Dwarf-Discuss
On Mar 19, 2020, at 5:49 PM, Michael Eager via Dwarf-Discuss
disc...@lists.dwarfstd.org> wrote:
My reading of sections 2.5 & 2.6 is that you cannot have a DW_OP_piece
I recall this being intentional as well. This is how I think of these items.
And this is just the gist of things. I didn't put on my ABI Lawyer hat for
this:
A DWARF expression is a stack machine that evaluates to a value.
A location description describes the "location" of an object. A "locati
Paul,
I haven't needed to contend with this issue. But as I was looking over the
standard, this was my initial gut reaction too: use the segment selectors. This
use actually does seem like it's a characteristic of the target architecture to
me. You started the discussion with "Harvard architect
Not to derail this thread, but another thing that might be worth checking
is: should debug_aranges include non-code addresses. GCC's don't, Clang's
do. Sounds like Clang's correct, but GCC is sort of the defacto standard
DWARF producer, so might be worth getting an authoritative
statement/clarified
> I think that the description has become a bit less clear with the
> addition of the Implicit Location Descriptions in Section 2.6.1.1.4,
> which do compute values, rather than locations. Perhaps these should
> have been described in Section 2.5 as parts of a DWARF expression, not
> as parts of a
On 3/23/20 3:58 PM, Cary Coutant via Dwarf-Discuss wrote:
I think that the description has become a bit less clear with the
addition of the Implicit Location Descriptions in Section 2.6.1.1.4,
which do compute values, rather than locations. Perhaps these should
have been described in Section 2.5
> DW_OP_implicit_value and DW_OP_stack_value produce values (that is
> R-values), not locations. I might be able to read
> DW_OP_implicit_pointer as providing a location; I'm not sure.
No, they don't produce a value. The expression that precedes them
produces a value, and these operators produce
