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Improve method lookup in mp_obj_class_lookup. 

Now searches both locals_dict and methods.  Partly addresses Issue #145.
This commit is contained in:
Damien George 2014-01-18 17:52:41 +00:00
parent 1d6fc94c16
commit f49ba1bd9c
3 changed files with 92 additions and 69 deletions
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140
py/objtype.c
View File

@ -28,16 +28,26 @@ static mp_obj_t mp_obj_new_class(mp_obj_t class) {
return o;
}
static mp_map_elem_t *mp_obj_class_lookup(const mp_obj_type_t *type, qstr attr, mp_map_lookup_kind_t lookup_kind) {
// will return MP_OBJ_NULL if not found
static mp_obj_t mp_obj_class_lookup(const mp_obj_type_t *type, qstr attr) {
for (;;) {
if (type->locals_dict == NULL) {
return NULL;
}
assert(MP_OBJ_IS_TYPE(type->locals_dict, &dict_type)); // Micro Python restriction, for now
mp_map_t *locals_map = ((void*)type->locals_dict + sizeof(mp_obj_base_t)); // XXX hack to get map object from dict object
mp_map_elem_t *elem = mp_map_lookup(locals_map, MP_OBJ_NEW_QSTR(attr), lookup_kind);
if (elem != NULL) {
return elem;
if (type->locals_dict != NULL) {
// search locals_dict (the dynamically created set of methods/attributes)
assert(MP_OBJ_IS_TYPE(type->locals_dict, &dict_type)); // Micro Python restriction, for now
mp_map_t *locals_map = ((void*)type->locals_dict + sizeof(mp_obj_base_t)); // XXX hack to get map object from dict object
mp_map_elem_t *elem = mp_map_lookup(locals_map, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
if (elem != NULL) {
return elem->value;
}
} else if (type->methods != NULL) {
// search methods (the const set of methods)
for (const mp_method_t *meth = type->methods; meth->name != NULL; meth++) {
if (strcmp(meth->name, qstr_str(attr)) == 0) {
return (mp_obj_t)meth->fun;
}
}
}
// attribute not found, keep searching base classes
@ -55,9 +65,9 @@ static mp_map_elem_t *mp_obj_class_lookup(const mp_obj_type_t *type, qstr attr,
}
for (uint i = 0; i < len - 1; i++) {
assert(MP_OBJ_IS_TYPE(items[i], &mp_const_type));
elem = mp_obj_class_lookup((mp_obj_type_t*)items[i], attr, lookup_kind);
if (elem != NULL) {
return elem;
mp_obj_t obj = mp_obj_class_lookup((mp_obj_type_t*)items[i], attr);
if (obj != MP_OBJ_NULL) {
return obj;
}
}
@ -78,18 +88,18 @@ static mp_obj_t class_make_new(mp_obj_t self_in, uint n_args, uint n_kw, const m
mp_obj_t o = mp_obj_new_class(self_in);
// look for __init__ function
mp_map_elem_t *init_fn = mp_obj_class_lookup(self, MP_QSTR___init__, MP_MAP_LOOKUP);
mp_obj_t init_fn = mp_obj_class_lookup(self, MP_QSTR___init__);
if (init_fn != NULL) {
if (init_fn != MP_OBJ_NULL) {
// call __init__ function
mp_obj_t init_ret;
if (n_args == 0 && n_kw == 0) {
init_ret = rt_call_function_n_kw(init_fn->value, 1, 0, (mp_obj_t*)&o);
init_ret = rt_call_function_n_kw(init_fn, 1, 0, (mp_obj_t*)&o);
} else {
mp_obj_t *args2 = m_new(mp_obj_t, 1 + n_args + 2 * n_kw);
args2[0] = o;
memcpy(args2 + 1, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
init_ret = rt_call_function_n_kw(init_fn->value, n_args + 1, n_kw, args2);
init_ret = rt_call_function_n_kw(init_fn, n_args + 1, n_kw, args2);
m_del(mp_obj_t, args2, 1 + n_args + 2 * n_kw);
}
if (init_ret != mp_const_none) {
@ -156,9 +166,9 @@ static mp_obj_t class_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
if (op_name == NULL) {
return MP_OBJ_NULL;
}
mp_map_elem_t *elem = mp_obj_class_lookup(lhs->base.type, qstr_from_str_static(op_name), MP_MAP_LOOKUP);
if (elem != NULL) {
return rt_call_function_2(elem->value, lhs_in, rhs_in);
mp_obj_t member = mp_obj_class_lookup(lhs->base.type, qstr_from_str_static(op_name));
if (member != MP_OBJ_NULL) {
return rt_call_function_2(member, lhs_in, rhs_in);
} else {
return MP_OBJ_NULL;
}
@ -173,41 +183,49 @@ static void class_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
dest[0] = elem->value;
return;
}
elem = mp_obj_class_lookup(self->base.type, attr, MP_MAP_LOOKUP);
if (elem != NULL) {
if (mp_obj_is_callable(elem->value)) {
mp_obj_t member = mp_obj_class_lookup(self->base.type, attr);
if (member != MP_OBJ_NULL) {
if (mp_obj_is_callable(member)) {
// class member is callable so build a bound method
dest[0] = elem->value;
dest[1] = self_in;
// check if the methods are functions, static or class methods
// see http://docs.python.org/3.3/howto/descriptor.html
// TODO check that this is the correct place to have this logic
if (MP_OBJ_IS_TYPE(member, &mp_type_staticmethod)) {
// return just the function
dest[0] = ((mp_obj_staticmethod_t*)member)->fun;
} 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_classmethod_t*)member)->fun;
dest[1] = mp_obj_get_type(self_in);
} else {
// return a bound method, with self being this object
dest[0] = member;
dest[1] = self_in;
}
return;
} else {
// class member is a value, so just return that value
dest[0] = elem->value;
dest[0] = member;
return;
}
}
}
static bool class_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
// logic: look in class locals (no add) then obj members (add) (TODO check this against CPython)
mp_obj_class_t *self = self_in;
mp_map_elem_t *elem = mp_obj_class_lookup(self->base.type, attr, MP_MAP_LOOKUP);
if (elem != NULL) {
elem->value = value;
} else {
mp_map_lookup(&self->members, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
}
mp_map_lookup(&self->members, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
return true;
}
bool class_store_item(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_class_t *self = self_in;
mp_map_elem_t *elem = mp_obj_class_lookup(self->base.type, qstr_from_str_static("__setitem__"), MP_MAP_LOOKUP);
if (elem != NULL) {
mp_obj_t member = mp_obj_class_lookup(self->base.type, qstr_from_str_static("__setitem__"));
if (member != MP_OBJ_NULL) {
mp_obj_t args[3] = {self_in, index, value};
return rt_call_function_n_kw(elem->value, 3, 0, args);
rt_call_function_n_kw(member, 3, 0, args);
return true;
} else {
return MP_OBJ_NULL;
return false;
}
}
@ -260,34 +278,21 @@ static mp_obj_t type_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj
static void type_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_const_type));
mp_obj_type_t *self = self_in;
mp_map_elem_t *elem = mp_obj_class_lookup(self, attr, MP_MAP_LOOKUP);
if (elem != NULL) {
dest[0] = elem->value;
return;
}
// generic method lookup
// this is a lookup in the class itself (ie not the classes type or instance)
const mp_method_t *meth = self->methods;
if (meth != NULL) {
for (; meth->name != NULL; meth++) {
if (strcmp(meth->name, qstr_str(attr)) == 0) {
// 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(meth->fun, &mp_type_staticmethod)) {
// return just the function
dest[0] = ((mp_obj_staticmethod_t*)meth->fun)->fun;
} else if (MP_OBJ_IS_TYPE(meth->fun, &mp_type_classmethod)) {
// return a bound method, with self being this class
dest[0] = ((mp_obj_classmethod_t*)meth->fun)->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] = (mp_obj_t)meth->fun;
}
return;
}
mp_obj_t member = mp_obj_class_lookup(self, attr);
if (member != 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, &mp_type_staticmethod)) {
// return just the function
dest[0] = ((mp_obj_staticmethod_t*)member)->fun;
} else if (MP_OBJ_IS_TYPE(member, &mp_type_classmethod)) {
// return a bound method, with self being this class
dest[0] = ((mp_obj_classmethod_t*)member)->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] = (mp_obj_t)member;
}
}
}
@ -298,9 +303,10 @@ static bool type_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
// TODO CPython allows STORE_ATTR to a class, but is this the correct implementation?
mp_map_elem_t *elem = mp_obj_class_lookup(self, attr, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND);
if (elem != NULL) {
elem->value = value;
if (self->locals_dict != NULL) {
assert(MP_OBJ_IS_TYPE(self->locals_dict, &dict_type)); // Micro Python restriction, for now
mp_map_t *locals_map = ((void*)self->locals_dict + sizeof(mp_obj_base_t)); // XXX hack to get map object from dict object
mp_map_lookup(locals_map, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
return true;
} else {
return false;

4
py/runtime.c
View File

@ -820,8 +820,8 @@ void rt_load_method(mp_obj_t base, qstr attr, mp_obj_t *dest) {
if (attr == MP_QSTR___next__ && type->iternext != NULL) {
dest[0] = (mp_obj_t)&mp_builtin_next_obj;
dest[1] = base;
} else {
// generic method lookup
} else if (type->load_attr == NULL) {
// generic method lookup if type didn't provide a specific one
// this is a lookup in the object (ie not class or type)
const mp_method_t *meth = type->methods;
if (meth != NULL) {

17
tests/basics/tests/class_store.py Normal file
View File

@ -0,0 +1,17 @@
# store to class vs instance
class C:
pass
c = C()
c.x = 1
print(c.x)
C.x = 2
C.y = 3
print(c.x, c.y)
print(C.x, C.y)
print(C().x, C().y)
c = C()
print(c.x)
c.x = 4
print(c.x)