Function generate_getter

mypyc/codegen/emitclass.py:1148–1173

(cl: ClassIR, attr: str, rtype: RType, emitter: Emitter)

def generate_getter(cl: ClassIR, attr: str, rtype: RType, emitter: Emitter) -> None:
    attr_field = emitter.attr(attr)
    emitter.emit_line("static PyObject *")
    emitter.emit_line(
        "{}({} *self, void *closure)".format(
            getter_name(cl, attr, emitter.names), cl.struct_name(emitter.names)
        )
    )
    emitter.emit_line("{")
    attr_expr = f"self->{attr_field}"

    # HACK: Don't consider refcounted values as always defined, since it's possible to
    #       access uninitialized values via 'gc.get_objects()'. Accessing non-refcounted
    #       values is benign.
    always_defined = cl.is_always_defined(attr) and not rtype.is_refcounted

    if not always_defined:
        emitter.emit_undefined_attr_check(rtype, attr_expr, "==", "self", attr, cl, unlikely=True)
        emitter.emit_line("PyErr_SetString(PyExc_AttributeError,")
        emitter.emit_line(f'    "attribute {repr(attr)} of {repr(cl.name)} undefined");')
        emitter.emit_line("return NULL;")
        emitter.emit_line("}")
    emitter.emit_inc_ref(f"self->{attr_field}", rtype)
    emitter.emit_box(f"self->{attr_field}", "retval", rtype, declare_dest=True)
    emitter.emit_line("return retval;")
    emitter.emit_line("}")


def generate_setter(cl: ClassIR, attr: str, rtype: RType, emitter: Emitter) -> None: