Looks up the cell type for each cell in the design, returning the value of `CellType::is_<property>`.
Only works for exact match, and only for internal cells.
Also add a simple test checking a small design with an $add cell and an $sdff cell.
- functions that have a const `[]` operator method now support `__getitem__` in Python
- fields of a pointer type now return a `reference_internal` instead of a `copy` because classes referenced to by pointers typically aren't copyable (e.g. RTLIL::Wire, RTLIL::Module, etc)
- removed duplicate of test_script.py
In order to support unsized constants being used as parameters, the `const` struct needs to know if it is unsized (so that the parameter can be used to set the size).
Add unsized flag to param value serialization and rtlil back-/front-end.
Add cell params to `tests/rtlil/everything.v`.
- consistently use value semantics for objects passed along FFI boundary
(not ideal but matches previous behavior)
- add new overload of RTLIL::Module: addMemory that does not require a "donor" object
- the idea is `Module`, `Memory`, `Wire`, `Cell` and `Process` cannot be directly constructed in Python and can only be added to the existing memory hierarchy in `Design` using the `add` methods - `Memory` requiring a donor object was the odd one out here
- fix superclass member wrapping only looking at direct superclass for inheritance instead of recursively checking superclasses
- fix superclass member wrapping not using superclass's denylists
- fix Design's `__str__` function not returning a string
- fix the generator crashing if there's any `std::function` in a header
- misc: add a crude `__repr__` based on `__str__`
This uses the environment variable `YOSYS_PLUGIN_PATH` to provide multiple colon-delimited search paths for native plugins in a similar manner to `PATH` for executables and `PYTHONPATH` for Python modules.
This addresses https://github.com/YosysHQ/yosys/issues/2545, allowing Yosys to be better packaged in non-FHS environments such as Nix.
