[Dwarf-Discuss] Fwd: Re: DWARF: Hierarchies of abstract and concrete DIE instance trees

Michael Eager eager at eagerm.com
Wed Nov 22 15:58:47 PST 2017


On 11/22/2017 02:17 PM, David Anderson wrote:
> "In general, the structure and content of any
> given concrete inlined instance tree
> will be closely analogous to the structure
> and content of its associated abstract
> instance tree. There are a few exceptions:"
> ...
> "2. Entries in the concrete instance tree which are associated with
> entries in the
> abstract instance tree such that neither
> has a DW_AT_name attribute, and
> neither is referenced by any other debugging
> information entry, may be
> omitted. This may happen for debugging
> information entries in the abstract
> instance trees that became unnecessary
> in the concrete instance tree because
> of additional information available there.
> For example, an anonymous
> variable might have been created and
> described in the abstract instance tree,
> but because of the actual parameters
> for a particular inlined expansion, it
> could be described as a constant value
> without the need for that separate
> debugging information entry."
> ...

This says that entries in the abstract tree may be omitted from the 
concrete tree if unneeded.  I don't see this implying that entries 
(e.g., lexical blocks) may be created in the concrete tree that do not 
exist in the abstract tree.


-- 
Michael Eager    eager at eagerm.com
1960 Park Blvd., Palo Alto, CA 94306


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