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frontend,rtlil: fix search for cell-referenced $scopeinfo

Artem Kotsynyak requested to merge fix/rtlil-import-metadata into main

$scopeinfo is referenced by name in object attributes:

  • public objects use an hdlname attribute,
  • internal objects ues an scopename attribute.

In either case, reference is a list of space-separated names representing hiearchical scope name. Previously, the name of a $scopeinfo cell was used internally to store an info, but the name of a public cell is a backslash-prefixed dot-separated list of hierarchical name components. The mismatch caused an exception to be thrown.

The change consistently uses space-separated name components to store and reference $scopeinfo objects.

If a scope is nested, corresponding $scopeinfo has an hdlname attribute with a list of space-separated name components. However, top-level scopes miss an hdlname attribute and are referenced by cell name instead.

Signed-off-by: Artem Kotsynyak kotsynyak@ispras.ru

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