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objtype: Separate __new__ and __init__ methods. 

Now schedule is: for native types, we call ->make_new() C-level method, which
should perform actions of __new__ and __init__ (note that this is not
compliant, but is efficient), but for user types, __new__ and __init__ are
called as expected.

Also, make sure we convert scalar attribute value to a bound-pair tight in
mp_obj_class_lookup() method, which avoids converting it again and again in
its callers.
This commit is contained in:
Paul Sokolovsky 2014-05-18 20:37:18 +03:00
parent eee31288dd
commit 13684fd60b
2 changed files with 50 additions and 62 deletions
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111
py/objtype.c
View File

@ -49,8 +49,10 @@
/******************************************************************************/
// instance object
#define is_instance_type(type) ((type)->make_new == instance_make_new)
#define is_native_type(type) ((type)->make_new != instance_make_new)
STATIC mp_obj_t instance_make_new(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args);
STATIC void instance_convert_return_attr(mp_obj_t self, const mp_obj_type_t *type, mp_obj_t member, mp_obj_t *dest);
STATIC mp_obj_t mp_obj_new_instance(mp_obj_t class, uint subobjs) {
mp_obj_instance_t *o = m_new_obj_var(mp_obj_instance_t, mp_obj_t, subobjs);
@ -120,10 +122,10 @@ STATIC void mp_obj_class_lookup(mp_obj_instance_t *o, const mp_obj_type_t *type,
if (elem != NULL) {
dest[0] = elem->value;
if (o != MP_OBJ_NULL && is_native_type(type)) {
dest[1] = o->subobj[0];
instance_convert_return_attr(o->subobj[0], type, elem->value, dest);
} else {
instance_convert_return_attr(o, type, elem->value, dest);
}
// TODO: Sensibly, we should call instance_convert_return_attr() here,
// instead of multiple places later. Also, this code duplicates runtime.c much.
return;
}
}
@ -216,38 +218,56 @@ STATIC mp_obj_t instance_make_new(mp_obj_t self_in, uint n_args, uint n_kw, cons
mp_obj_instance_t *o = mp_obj_new_instance(self_in, num_native_bases);
// look for __init__ function
// look for __new__ function
mp_obj_t init_fn[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(NULL, self, MP_QSTR___init__, offsetof(mp_obj_type_t, make_new), init_fn);
mp_obj_class_lookup(NULL, self, MP_QSTR___new__, offsetof(mp_obj_type_t, make_new), init_fn);
mp_obj_t new_ret = o;
if (init_fn[0] == MP_OBJ_SENTINEL) {
// Native type's constructor is what wins - it gets all our arguments,
// and none Python classes are initialized at all.
o->subobj[0] = native_base->make_new((mp_obj_type_t*)native_base, n_args, n_kw, args);
} else if (init_fn[0] != MP_OBJ_NULL) {
// We need to default-initialize any native subobjs first
if (num_native_bases > 0) {
o->subobj[0] = native_base->make_new((mp_obj_type_t*)native_base, 0, 0, NULL);
}
// now call Python class __init__ function with all args
mp_obj_t init_ret;
// now call Python class __new__ function with all args
if (n_args == 0 && n_kw == 0) {
init_ret = mp_call_function_n_kw(init_fn[0], 1, 0, (mp_obj_t*)(void*)&o);
new_ret = mp_call_function_n_kw(init_fn[0], 1, 0, (mp_obj_t*)(void*)&self_in);
} else {
mp_obj_t *args2 = m_new(mp_obj_t, 1 + n_args + 2 * n_kw);
args2[0] = o;
args2[0] = self_in;
memcpy(args2 + 1, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
init_ret = mp_call_function_n_kw(init_fn[0], n_args + 1, n_kw, args2);
new_ret = mp_call_function_n_kw(init_fn[0], n_args + 1, n_kw, args2);
m_del(mp_obj_t, args2, 1 + n_args + 2 * n_kw);
}
}
// https://docs.python.org/3.4/reference/datamodel.html#object.__new__
// "If __new__() does not return an instance of cls, then the new instance’s __init__() method will not be invoked."
if (mp_obj_get_type(new_ret) != self_in) {
return new_ret;
}
o = new_ret;
// now call Python class __init__ function with all args
init_fn[0] = init_fn[1] = NULL;
mp_obj_class_lookup(o, self, MP_QSTR___init__, 0, init_fn);
if (init_fn[0] != MP_OBJ_NULL) {
mp_obj_t init_ret;
if (n_args == 0 && n_kw == 0) {
init_ret = mp_call_method_n_kw(0, 0, init_fn);
} else {
mp_obj_t *args2 = m_new(mp_obj_t, 2 + n_args + 2 * n_kw);
args2[0] = init_fn[0];
args2[1] = init_fn[1];
memcpy(args2 + 2, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
init_ret = mp_call_method_n_kw(n_args, n_kw, args2);
m_del(mp_obj_t, args2, 2 + n_args + 2 * n_kw);
}
if (init_ret != mp_const_none) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "__init__() should return None, not '%s'", mp_obj_get_type_str(init_ret)));
}
} else {
if (n_args != 0) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "object() takes no parameters"));
}
}
return o;
@ -325,7 +345,7 @@ STATIC const qstr binary_op_method_name[] = {
// and put the result in the dest[] array for a possible method call.
// Conversion means dealing with static/class methods, callables, and values.
// see http://docs.python.org/3.3/howto/descriptor.html
STATIC void instance_convert_return_attr(mp_obj_t self, mp_obj_t member, mp_obj_t *dest) {
STATIC void instance_convert_return_attr(mp_obj_t self, const mp_obj_type_t *type, mp_obj_t member, mp_obj_t *dest) {
assert(dest[1] == NULL);
if (MP_OBJ_IS_TYPE(member, &mp_type_staticmethod)) {
// return just the function
@ -333,7 +353,7 @@ STATIC void instance_convert_return_attr(mp_obj_t self, mp_obj_t member, mp_obj_
} else if (MP_OBJ_IS_TYPE(member, &mp_type_classmethod)) {
// return a bound method, with self being the type of this object
dest[0] = ((mp_obj_static_class_method_t*)member)->fun;
dest[1] = mp_obj_get_type(self);
dest[1] = (mp_obj_t)type;
} else if (MP_OBJ_IS_TYPE(member, &mp_type_type)) {
// Don't try to bind types
dest[0] = member;
@ -357,14 +377,11 @@ STATIC mp_obj_t instance_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
return MP_OBJ_NOT_SUPPORTED;
}
*/
mp_obj_t member[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(lhs, lhs->base.type, op_name, offsetof(mp_obj_type_t, binary_op), member);
if (member[0] == MP_OBJ_SENTINEL) {
mp_obj_t dest[3] = {MP_OBJ_NULL};
mp_obj_class_lookup(lhs, lhs->base.type, op_name, offsetof(mp_obj_type_t, binary_op), dest);
if (dest[0] == MP_OBJ_SENTINEL) {
return mp_binary_op(op, lhs->subobj[0], rhs_in);
} else if (member[0] != MP_OBJ_NULL) {
mp_obj_t dest[3];
dest[1] = MP_OBJ_NULL;
instance_convert_return_attr(lhs_in, member[0], dest);
} else if (dest[0] != MP_OBJ_NULL) {
dest[2] = rhs_in;
return mp_call_method_n_kw(1, 0, dest);
} else {
@ -374,6 +391,7 @@ STATIC mp_obj_t instance_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
STATIC void instance_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
// logic: look in obj members then class locals (TODO check this against CPython)
assert(is_instance_type(mp_obj_get_type(self_in)));
mp_obj_instance_t *self = self_in;
mp_map_elem_t *elem = mp_map_lookup(&self->members, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
@ -387,9 +405,8 @@ STATIC void instance_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
mp_obj_class_lookup(self, self->base.type, attr, 0, dest);
mp_obj_t member = dest[0];
if (member != MP_OBJ_NULL) {
if (0) {
#if MICROPY_ENABLE_PROPERTY
} else if (MP_OBJ_IS_TYPE(member, &mp_type_property)) {
if (MP_OBJ_IS_TYPE(member, &mp_type_property)) {
// object member is a property
// delegate the store to the property
// TODO should this be part of instance_convert_return_attr?
@ -400,15 +417,8 @@ STATIC void instance_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
dest[0] = mp_call_function_n_kw(proxy[0], 1, 0, &self_in);
// TODO should we convert the returned value using instance_convert_return_attr?
}
#endif
} else {
// not a property
// if we don't yet have bound method (supposedly from native base), go
// try to convert own attrs.
if (dest[1] == MP_OBJ_NULL) {
instance_convert_return_attr(self_in, member, dest);
}
}
#endif
return;
}
@ -516,7 +526,6 @@ STATIC mp_obj_t instance_getiter(mp_obj_t self_in) {
mp_obj_class_lookup(self, self->base.type, MP_QSTR___getitem__, 0, member);
if (member[0] != MP_OBJ_NULL) {
// __getitem__ exists, create an iterator
instance_convert_return_attr(self_in, member[0], member);
return mp_obj_new_getitem_iter(member);
}
return MP_OBJ_NULL;
@ -584,24 +593,7 @@ STATIC void type_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
return;
}
#endif
mp_obj_t member[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(NULL, self, attr, 0, member);
if (member[0] != MP_OBJ_NULL) {
// check if the methods are functions, static or class methods
// see http://docs.python.org/3.3/howto/descriptor.html
if (MP_OBJ_IS_TYPE(member[0], &mp_type_staticmethod)) {
// return just the function
dest[0] = ((mp_obj_static_class_method_t*)member[0])->fun;
} else if (MP_OBJ_IS_TYPE(member[0], &mp_type_classmethod)) {
// return a bound method, with self being this class
dest[0] = ((mp_obj_static_class_method_t*)member[0])->fun;
dest[1] = self_in;
} else {
// return just the function
// TODO need to wrap in a type check for the first argument; eg list.append(1,1) needs to throw an exception
dest[0] = member[0];
}
}
mp_obj_class_lookup(NULL, self, attr, 0, dest);
}
STATIC bool type_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
@ -742,12 +734,7 @@ STATIC void super_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
mp_obj_tuple_get(type->bases_tuple, &len, &items);
for (uint i = 0; i < len; i++) {
assert(MP_OBJ_IS_TYPE(items[i], &mp_type_type));
mp_obj_t member[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(self->obj, (mp_obj_type_t*)items[i], attr, 0, member);
if (member[0] != MP_OBJ_NULL) {
instance_convert_return_attr(self->obj, member[0], dest);
return;
}
mp_obj_class_lookup(self->obj, (mp_obj_type_t*)items[i], attr, 0, dest);
}
}

1
py/qstrdefs.h
View File

@ -34,6 +34,7 @@ Q(__class__)
Q(__doc__)
Q(__import__)
Q(__init__)
Q(__new__)
Q(__locals__)
Q(__main__)
Q(__module__)