Defining system calls for platforms

[nullableVoidPtr]

I see BNTypeBuilderSetSystemCallNumber, and I assume this can be used in conjunction with function types. I have attempted to register a type library with named objects with function but to no avail. I do see how to get system calls in a dict, but I don't see how to define system calls, which would prove to be an extremely useful interface for working with exotic architectures, with hypercalls for example.

I do understand that there is the class attribute type_file_path, but I don't understand which function attribute, if any, would specify this (__system_call_number(42)??)

[nullableVoidPtr]

Answered my own question:

binaryninja-api/docs/guide/types/attributes.md

Line 132 in e2feac8

[Type Libraries](typelibraries.md) can annotate system calls by adding functions with the special `__syscall()` attribute, specifying names and arguments for each syscall number. This attribute has no effect outside of [Type Libraries](typelibraries.md) and [Platform Types](platformtypes.md).

The question still stands for "ephemeral" types generated dynamically at Platform instantiation - how would this be possible?