Hi John,
The OpenMP Tools Workgroup has been discussing a very similar issue for OpenMP threads and TARGET regions (e.g.,regions offloaded to GPUs). Tony Tye at AMD (who is also a DWARF committee member) proposed a model where the compiler can generate DWARF that would tell a consumer (most likely a debugger) how to call out to a helper library to satisfy the queries.
Tony can explain better than I, but basically it's a generalization and abstraction of existing models where the semantics and interfaces are hard-coded into the tools. For example, for TLS (thread-local storage) on Linux, DWARF has "push TLS" operators where the debugger is supposed to know to dlopen() and call into libthread_db.so to calculate the address of a TLS object given the "key" on the top of the evaluation stack. The vision is to enhance DWARF to be able to describe complex operations without hard-coding the details of the interface into the tools.
Cheers, John D.
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