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objtype: Clarify comment for mp_obj_class_lookup().

This commit is contained in:
Paul Sokolovsky 2015-03-16 13:32:03 +02:00
parent 66c11ec581
commit 2b67a40fdb
1 changed files with 9 additions and 7 deletions
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16
py/objtype.c
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@ -90,13 +90,15 @@ STATIC int instance_count_native_bases(const mp_obj_type_t *type, const mp_obj_t
// http://python-history.blogspot.com/2010/06/method-resolution-order.html
// https://www.python.org/download/releases/2.3/mro/
//
// will return MP_OBJ_NULL if not found
// will return MP_OBJ_SENTINEL if special method was found in a native type base
// via slot id (meth_offset). As there can be only one native base, it's known that it
// applies to instance->subobj[0]. In most cases, we also don't need to know which type
// it was - because instance->subobj[0] is of that type. The only exception is when
// object is not yet constructed, then we need to know base native type to construct
// instance->subobj[0]. This case is handled via instance_count_native_bases() though.
// will keep lookup->dest[0]'s value (should be MP_OBJ_NULL on invocation) if attribute
// is not found
// will set lookup->dest[0] to MP_OBJ_SENTINEL if special method was found in a native
// type base via slot id (as specified by lookup->meth_offset). As there can be only one
// native base, it's known that it applies to instance->subobj[0]. In most cases, we also
// don't need to know which type it was - because instance->subobj[0] is of that type.
// The only exception is when object is not yet constructed, then we need to know base
// native type to construct its instance->subobj[0] from. But this case is handled via
// instance_count_native_bases(), which returns a native base which it saw.
struct class_lookup_data {
mp_obj_instance_t *obj;
qstr attr;