Re: [Dwarf-Discuss] Use of Location Description operations in DWARF Expressions?

[Adrian Prantl via Dwarf-Discuss]

> On Mar 19, 2020, at 5:49 PM, Michael Eager via Dwarf-Discuss 
> <dwarf-discuss@lists.dwarfstd.org> wrote:
> 
> My reading of sections 2.5 & 2.6 is that you cannot have a DW_OP_piece in an 
> DWARF expression.
> 

I wonder if this is an intentional part of the design because of 
ambiguity/correctness issues or is this just something that happens to fall out 
of the way the text is worded? I can see how such a restriction might simplify 
DWARF consumers, but it also seems like an arbitrary restriction for which 
there may not be a technical reason.

That distinction is important, because if there is a *technical* reason for not 
supporting them we should refrain from implementing this in LLVM. But if there 
isn't, there is no harm done in implementing it as an extension, and DWARF 
consumers that don't support it can just ignore these expressions and return 
N/A.

-- adrian
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