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Import design metadata from RTLIL

Artem Kotsynyak requested to merge feature/rtlil-metadata into main

Metadata required:

  • source location for cells a.k.a. debug info
  • hierarchical names

Source location is imported as is for every cell with the attribute.

Hierarchical names are derived as follows:

  • if a cell has a public name, it is used as is (module instances, including library cells and macro blocks);
  • if a cell with internal name has a single output (wire) with public name, the name of the wire is used (w.r.t. slices, e.g in[1:0] or in[0]);
  • otherwise cell name is not set.

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