granata.enrico added a comment.
One alternative would be to have the num_children method on the synthetic
provider itself be able to take an optional argument that is the max_count.
That is, instead of defining
def num_children(self):
..
You would instead define
def num_children(self, max_count):
..
Of course, you would need to continue supporting both possible signatures in
order to maintain compatibility with existing formatters. But we do have some
support for that. If you look at LLDBSwigPythonCallCommand:
PyCallable::argc argc = pfunc.GetNumArguments();
if (argc.num_args == 5 || argc.varargs == true)
pvalue = pfunc(debugger_sb, args, exe_ctx_sb, &cmd_retobj_sb,
session_dict = FindSessionDictionary(session_dictionary_name));
else
pvalue = pfunc(debugger_sb, args, &cmd_retobj_sb, session_dict =
FindSessionDictionary(session_dictionary_name));
num_children could start doing something similar for 1 vs. 2 arguments
http://reviews.llvm.org/D13778
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