Commits on Dec 13, 2023

1. [FIRRTL] Create debug info scopes for inlined modules …

   When inlining and flattening FIRRTL instances, create `dbg.scope`
   operations to track information about the original hierarchy in the
   debug info.
   
   To do this, the FIRRTL inliner now creates a `dbg.scope` op for every
   inlined instance. When renaming the operations in the inlined module's
   body, debug operations are assigned this scope (unless they already had
   a scope assigned). This retains information about the original
   hierarchy.
   
   Unfortunately, this approach currently only works for debug variables
   and scopes. Instances have no `scope` operand where a parent scope can
   be annotated. As a result, instance ops whose parent module got inlined
   do not properly track their original scope. This limitation will go away
   in the future once we are either able to interact with and modify the
   implicit scope created by instances, or instances scopes get passed in
   as explicit operands.

   

   fabianschuiki committed Dec 13, 2023
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