[fpc-devel] unused dwarf entries produced by FPC

[Jonas Maebe]

On 08 Oct 2013, at 13:04, Martin wrote:

> I ask here before reporting on mantis, maybe I overlooked something
>
> program Test_Record_var_param;
> type
>  TFoo = record
>    a,b: Integer;
>  end;
>  PFoo = ^TFoo;
> var
>  r1, r2: TFoo;
>  p1, p2: PFoo;
> begin
>  P1 := @r1;
>  P2 := @r1;
> end.
>
> objdump.exe -Wia Test_Record_var_param.exe
>
> Shows an dwarf entry
> <1><f1>: Abbrev Number: 7 (DW_TAG_reference_type)
>    <f2>   DW_AT_type        : <0xcb>
>
>
> This entry is not referenced by any other entry. IT seems unused.
> Also (afaik) there should not be a DW_TAG_reference_type, as P1 and  
> P2 are DW_TAG_pointer_type

Reference types are generated for every type to use when a call-by- 
reference parameter with this type exists. This is by design.


Jonas