[Dwarf-discuss] Encoding variant records: request for clarification.
Sat Aug 19 10:05:19 GMT 2006
Evidently, I did not make the source of my confusion sufficiently clear.
Again, the type in question is
type R (N : Integer) is record
Data : String (1 .. N);
case N is
when 0 =>
Name : String (1 .. N);
when 1..20 =>
Id, Port : Integer;
when others =>
Both responders said essentially the same thing, viz.,
> I think the answer to this question is covered by the example type REC2
> presented in D.2.2. See Figure 53 on p197 in particular. The key point,
> I think, is that there is only one entity named N and the other uses of
> N are references to it.
Yes, I saw that section, and it's nice as far as it goes. However, my
issue was with the treatment of N in "case N is" part. The Dwarf 3
standard says (5.6.9, pg. 79):
If the variant part has a discriminant, the discriminant is represented
by a separate debugging information entry which is a ->>CHILD OF THE
VARIANT PART ENTRY.<<- ... The variant part entry will have a
DW_AT_discr attribute whose value is a reference to the member entry
for the discriminant.
So field N would be a child of the variant_part representing
case N is ... end case
But N is ALREADY a child of the structure_type (or whatever) that represents
type R (N: Integer) is record ... end record;
So what gives?
Thanks for your help.
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