[Dlang-internal] Finding the module that caused a template instanciation

[Benjamin Thaut]

For my dll work I need some pointers from someone who has a 
deeper understanding of how the template implementation inside 
dmd works. Here is the problem

Given a template instance I need to know which module caused this 
template to be instanciated. I don't need the module the template 
was declared in but instead the module that triggered the 
instanciation. This also has to work in cases where the compiler 
re-uses existing template instances. In a re-use case I need the 
module that caused instaciation of the re-used instance.


Example:

module a;

struct SomeTemplate(T){ ... }

module b;

SomeTemplate!int g_var;


When looking at template instace caused by the g_var declaration 
I need to know that it was instanciated because the module "b" 
requested it.

Looking at the data structures conntected to templates and the 
template instance I got the impression that this information is 
currently not stored in the compiler internal data structures. In 
case this actually is not stored yet, what would be the best 
place to add it?

Kind Regards
Benjamin Thaut