From c78ef92d787d7bab8acbec69e978037ec2b20d21 Mon Sep 17 00:00:00 2001
From: Damien George
Date: Tue, 12 Dec 2017 15:22:03 +1100
Subject: py/objtype: Refactor object's handling of __new__ to not create 2
 objs.

Before this patch, if a user defined the __new__() function for a class
then two instances of that class would be created: once before __new__ is
called and once during the __new__ call (assuming the user creates some
instance, eg using super().__new__, which is most of the time).  The first
one was then discarded.  This refactor makes it so that a new instance is
only created if the user __new__ function doesn't exist.
---
 py/objtype.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'py/objtype.h')

diff --git a/py/objtype.h b/py/objtype.h
index 52419f3cd..1f4313084 100644
--- a/py/objtype.h
+++ b/py/objtype.h
@@ -37,6 +37,11 @@ typedef struct _mp_obj_instance_t {
     // TODO maybe cache __getattr__ and __setattr__ for efficient lookup of them
 } mp_obj_instance_t;
 
+#if MICROPY_CPYTHON_COMPAT
+// this is needed for object.__new__
+mp_obj_instance_t *mp_obj_new_instance(const mp_obj_type_t *cls, const mp_obj_type_t **native_base);
+#endif
+
 // this needs to be exposed for MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE to work
 void mp_obj_instance_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest);
 
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