Python: Restrict code to stable ABI subset Limit usage of the Python C API to the stable ABI subset as defined by PEP 384. This removes some type definitions and functions which libsigrokdecode made use of. Convert all affected code to suitable API alternatives. Also fix a few leaks that became apparent while working on the code. The most visible change is that PyTypeObject is now an opaque type. Thus, the custom Decoder and srd_logic types are now created on the heap via an alternative API. Unfortunately, since tp_name is now inaccessible, type names had to be removed from the log output. Stack traces after Python exceptions are now formatted by calling into Python, since the trace object C API is no longer available.
srd: Support for one or more optional probes. In the protocol decoder you always get all required probes, then _all_ optional probes in the list of probes in the decode() call. Example: (r1, r2, r3, o1, o2, o3, o4) = pins In this case r1-r3 are required probes, o1-o4 are optional probes. However, the value of valid/used/specified probes will be 0 or 1, whereas the value of probes that were not specified/assigned by the user will be (at the moment) 42. The PD can check for a valid probe like this: if p in (0, 1): ... Or check for an invalid probe: if (p > 1): ... The value of 42 could change to be -1 or None later.