[fpc-devel] Insufficient Dwarf info for Interfaces

Michael Van Canneyt michael at freepascal.org
Thu Sep 15 16:17:09 CEST 2022

On Thu, 15 Sep 2022, Martin Frb via fpc-devel wrote:

> https://gitlab.com/freepascal.org/fpc/source/-/issues/39904
> On top of adding the functions in the interface to the dwarf info, it 
> would be great if the compiler could also add some sort of link to the 
> underlaying TObject.
> So the debugger could (if available) show the user the object/instance 
> that implements the interface.

I believe the whole idea of interfaces is that this info is not available :-)

For externally implemented interfaces (COM and the like) this will
definitely not be available. 
Delphi has a special interface which - when implemented - returns the object 
(TComponent) behind an interface.
You can then query this interface and get a reference to the object.
It's called IInterfaceComponentReference


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