RTL generation options.

Control blackbox generation. None implies blackboxes are not used. Top means the circuit will be turned into a blackbox. Instantiations means that the top level circuit will be written as normal, but submodules will be written as blackboxes.

Map signal names to mangled RTL names. This used in Hardcaml_verilator.

Write circuit to Verilog or Vhdl. Instantiations are (recursively) looked up in database and if a circuit exists it is also written. The output_mode specifies how the circuit should be written - either to a single file (or buffer, or channel) or to a directory with one file for each for the top level circuit and any instantiated circuits contained in the database.

print is output ~output_mode:(To_channel stdout)