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Commit 37977b7b authored by Damien George's avatar Damien George
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Merge pull request #528 from pfalcon/native-subclass1 

Initial support for subclassing native types
parents 4ae52d45 c9633101
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py/objtype.c
View file @ 37977b7b
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <assert.h>
......@@ -9,6 +11,13 @@
#include "runtime0.h"
#include "runtime.h"
#if 0 // print debugging info
#define DEBUG_PRINT (1)
#define DEBUG_printf DEBUG_printf
#else // don't print debugging info
#define DEBUG_printf(...) (void)0
#endif
/******************************************************************************/
// class object
// creating an instance of a class makes one of these objects
......@@ -16,26 +25,88 @@
typedef struct _mp_obj_class_t {
mp_obj_base_t base;
mp_map_t members;
mp_obj_t subobj[];
// TODO maybe cache __getattr__ and __setattr__ for efficient lookup of them
} mp_obj_class_t;
STATIC mp_obj_t mp_obj_new_class(mp_obj_t class) {
mp_obj_class_t *o = m_new_obj(mp_obj_class_t);
#define is_native_type(type) ((type)->make_new != class_make_new)
STATIC mp_obj_t class_make_new(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args);
STATIC mp_obj_t mp_obj_new_class(mp_obj_t class, uint subobjs) {
mp_obj_class_t *o = m_new_obj_var(mp_obj_class_t, mp_obj_t, subobjs);
o->base.type = class;
mp_map_init(&o->members, 0);
mp_seq_clear(o->subobj, 0, subobjs, sizeof(*o->subobj));
return o;
}
STATIC int class_count_native_bases(const mp_obj_type_t *type, const mp_obj_type_t **last_native_base) {
uint len;
mp_obj_t *items;
mp_obj_tuple_get(type->bases_tuple, &len, &items);
int count = 0;
for (uint i = 0; i < len; i++) {
assert(MP_OBJ_IS_TYPE(items[i], &mp_type_type));
if (is_native_type((const mp_obj_type_t *)items[i])) {
*last_native_base = items[i];
count++;
} else {
count += class_count_native_bases(items[i], last_native_base);
}
}
return count;
}
// TODO
// This implements depth-first left-to-right MRO, which is not compliant with Python3 MRO
// 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
STATIC mp_obj_t mp_obj_class_lookup(const mp_obj_type_t *type, qstr attr) {
// 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 class_count_native_bases() though.
STATIC void mp_obj_class_lookup(mp_obj_class_t *o, const mp_obj_type_t *type, qstr attr, machine_uint_t meth_offset, mp_obj_t *dest) {
assert(dest[0] == NULL);
assert(dest[1] == NULL);
for (;;) {
// Optimize special method lookup for native types
// This avoids extra method_name => slot lookup. On the other hand,
// this should not be applied to class types, as will result in extra
// lookup either.
if (meth_offset != 0 && is_native_type(type)) {
if (*(void**)((char*)type + meth_offset) != NULL) {
DEBUG_printf("mp_obj_class_lookup: matched special meth slot for %s\n", qstr_str(attr));
dest[0] = MP_OBJ_SENTINEL;
return;
}
}
if (type->locals_dict != NULL) {
// search locals_dict (the set of methods/attributes)
assert(MP_OBJ_IS_TYPE(type->locals_dict, &mp_type_dict)); // Micro Python restriction, for now
mp_map_t *locals_map = mp_obj_dict_get_map(type->locals_dict);
mp_map_elem_t *elem = mp_map_lookup(locals_map, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);
if (elem != NULL) {
return elem->value;
dest[0] = elem->value;
if (o != MP_OBJ_NULL && is_native_type(type)) {
dest[1] = o->subobj[0];
}
return;
}
}
// Try this for completeness, by all native methods should be statically defined
// in locals_dict, and would be handled by above.
if (o != MP_OBJ_NULL && is_native_type(type)) {
mp_load_method_maybe(o->subobj[0], attr, dest);
if (dest[0] != MP_OBJ_NULL) {
return;
}
}
......@@ -43,20 +114,20 @@ STATIC mp_obj_t mp_obj_class_lookup(const mp_obj_type_t *type, qstr attr) {
// for a const struct, this entry might be NULL
if (type->bases_tuple == MP_OBJ_NULL) {
return MP_OBJ_NULL;
return;
}
uint len;
mp_obj_t *items;
mp_obj_tuple_get(type->bases_tuple, &len, &items);
if (len == 0) {
return MP_OBJ_NULL;
return;
}
for (uint i = 0; i < len - 1; i++) {
assert(MP_OBJ_IS_TYPE(items[i], &mp_type_type));
mp_obj_t obj = mp_obj_class_lookup((mp_obj_type_t*)items[i], attr);
if (obj != MP_OBJ_NULL) {
return obj;
mp_obj_class_lookup(o, (mp_obj_type_t*)items[i], attr, meth_offset, dest);
if (dest[0] != MP_OBJ_NULL) {
return;
}
}
......@@ -69,14 +140,20 @@ STATIC mp_obj_t mp_obj_class_lookup(const mp_obj_type_t *type, qstr attr) {
STATIC void class_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_class_t *self = self_in;
qstr meth = (kind == PRINT_STR) ? MP_QSTR___str__ : MP_QSTR___repr__;
mp_obj_t member = mp_obj_class_lookup(self->base.type, meth);
if (member == MP_OBJ_NULL && kind == PRINT_STR) {
mp_obj_t member[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(self, self->base.type, meth, offsetof(mp_obj_type_t, print), member);
if (member[0] == MP_OBJ_NULL && kind == PRINT_STR) {
// If there's no __str__, fall back to __repr__
member = mp_obj_class_lookup(self->base.type, MP_QSTR___repr__);
mp_obj_class_lookup(self, self->base.type, MP_QSTR___repr__, 0, member);
}
if (member != MP_OBJ_NULL) {
mp_obj_t r = mp_call_function_1(member, self_in);
if (member[0] == MP_OBJ_SENTINEL) {
mp_obj_print_helper(print, env, self->subobj[0], kind);
return;
}
if (member[0] != MP_OBJ_NULL) {
mp_obj_t r = mp_call_function_1(member[0], self_in);
mp_obj_print_helper(print, env, r, PRINT_STR);
return;
}
......@@ -89,21 +166,34 @@ STATIC mp_obj_t class_make_new(mp_obj_t self_in, uint n_args, uint n_kw, const m
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_type));
mp_obj_type_t *self = self_in;
mp_obj_t o = mp_obj_new_class(self_in);
const mp_obj_type_t *native_base;
uint num_native_bases = class_count_native_bases(self, &native_base);
assert(num_native_bases < 2);
// look for __init__ function
mp_obj_t init_fn = mp_obj_class_lookup(self, MP_QSTR___init__);
mp_obj_class_t *o = mp_obj_new_class(self_in, num_native_bases);
if (init_fn != MP_OBJ_NULL) {
// call __init__ function
// look for __init__ 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);
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;
if (n_args == 0 && n_kw == 0) {
init_ret = mp_call_function_n_kw(init_fn, 1, 0, (mp_obj_t*)&o);
init_ret = mp_call_function_n_kw(init_fn[0], 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 = mp_call_function_n_kw(init_fn, n_args + 1, n_kw, args2);
init_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);
}
if (init_ret != mp_const_none) {
......@@ -111,9 +201,8 @@ STATIC mp_obj_t class_make_new(mp_obj_t self_in, uint n_args, uint n_kw, const m
}
} else {
// TODO
if (n_args != 0) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "function takes 0 positional arguments but %d were given", n_args));
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "object() takes no parameters"));
}
}
......@@ -132,12 +221,17 @@ STATIC const qstr unary_op_method_name[] = {
STATIC mp_obj_t class_unary_op(int op, mp_obj_t self_in) {
mp_obj_class_t *self = self_in;
qstr op_name = unary_op_method_name[op];
/* Still try to lookup native slot
if (op_name == 0) {
return MP_OBJ_NOT_SUPPORTED;
}
mp_obj_t member = mp_obj_class_lookup(self->base.type, op_name);
if (member != MP_OBJ_NULL) {
return mp_call_function_1(member, self_in);
*/
mp_obj_t member[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(self, self->base.type, op_name, offsetof(mp_obj_type_t, unary_op), member);
if (member[0] == MP_OBJ_SENTINEL) {
return mp_unary_op(op, self->subobj[0]);
} else if (member[0] != MP_OBJ_NULL) {
return mp_call_function_1(member[0], self_in);
} else {
return MP_OBJ_NOT_SUPPORTED;
}
......@@ -188,6 +282,7 @@ STATIC const qstr binary_op_method_name[] = {
// Conversion means dealing with static/class methods, callables, and values.
// see http://docs.python.org/3.3/howto/descriptor.html
STATIC void class_convert_return_attr(mp_obj_t self, 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
dest[0] = ((mp_obj_static_class_method_t*)member)->fun;
......@@ -210,14 +305,19 @@ STATIC mp_obj_t class_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
// __getattr__ or __getattribute__. It only looks in the class dictionary.
mp_obj_class_t *lhs = lhs_in;
qstr op_name = binary_op_method_name[op];
/* Still try to lookup native slot
if (op_name == 0) {
return MP_OBJ_NOT_SUPPORTED;
}
mp_obj_t member = mp_obj_class_lookup(lhs->base.type, op_name);
if (member != MP_OBJ_NULL) {
*/
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) {
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;
class_convert_return_attr(lhs_in, member, dest);
class_convert_return_attr(lhs_in, member[0], dest);
dest[2] = rhs_in;
return mp_call_method_n_kw(1, 0, dest);
} else {
......@@ -237,7 +337,8 @@ STATIC void class_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
return;
}
mp_obj_t member = mp_obj_class_lookup(self->base.type, attr);
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
......@@ -255,7 +356,11 @@ STATIC void class_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
#endif
} else {
// not a property
class_convert_return_attr(self_in, member, dest);
// if we don't yet have bound method (supposedly from native base), go
// try to convert own attrs.
if (dest[1] == MP_OBJ_NULL) {
class_convert_return_attr(self_in, member, dest);
}
}
return;
}
......@@ -280,11 +385,12 @@ STATIC bool class_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
#if MICROPY_ENABLE_PROPERTY
// for property, we need to do a lookup first in the class dict
// this makes all stores slow... how to fix?
mp_obj_t member = mp_obj_class_lookup(self->base.type, attr);
if (member != MP_OBJ_NULL && MP_OBJ_IS_TYPE(member, &mp_type_property)) {
mp_obj_t member[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(self, self->base.type, attr, 0, member);
if (member[0] != MP_OBJ_NULL && MP_OBJ_IS_TYPE(member[0], &mp_type_property)) {
// attribute already exists and is a property
// delegate the store to the property
const mp_obj_t *proxy = mp_obj_property_get(member);
const mp_obj_t *proxy = mp_obj_property_get(member[0]);
if (proxy[1] == mp_const_none) {
// TODO better error message
return false;
......@@ -309,25 +415,27 @@ STATIC bool class_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
STATIC mp_obj_t class_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_class_t *self = self_in;
mp_obj_t member;
mp_obj_t member[2] = {MP_OBJ_NULL};
uint meth_args;
if (value == MP_OBJ_NULL) {
// delete item
member = mp_obj_class_lookup(self->base.type, MP_QSTR___delitem__);
mp_obj_class_lookup(self, self->base.type, MP_QSTR___delitem__, offsetof(mp_obj_type_t, subscr), member);
meth_args = 2;
} else if (value == MP_OBJ_SENTINEL) {
// load item
member = mp_obj_class_lookup(self->base.type, MP_QSTR___getitem__);
mp_obj_class_lookup(self, self->base.type, MP_QSTR___getitem__, offsetof(mp_obj_type_t, subscr), member);
meth_args = 2;
} else {
// store item
member = mp_obj_class_lookup(self->base.type, MP_QSTR___setitem__);
mp_obj_class_lookup(self, self->base.type, MP_QSTR___setitem__, offsetof(mp_obj_type_t, subscr), member);
meth_args = 3;
}
if (member != MP_OBJ_NULL) {
if (member[0] == MP_OBJ_SENTINEL) {
return mp_obj_subscr(self->subobj[0], index, value);
} else if (member[0] != MP_OBJ_NULL) {
mp_obj_t args[3] = {self_in, index, value};
// TODO probably need to call class_convert_return_attr, and use mp_call_method_n_kw
mp_obj_t ret = mp_call_function_n_kw(member, meth_args, 0, args);
mp_obj_t ret = mp_call_function_n_kw(member[0], meth_args, 0, args);
if (value == MP_OBJ_SENTINEL) {
return ret;
} else {
......@@ -340,11 +448,15 @@ STATIC mp_obj_t class_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
STATIC mp_obj_t class_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_class_t *self = self_in;
mp_obj_t member = mp_obj_class_lookup(self->base.type, MP_QSTR___call__);
if (member == MP_OBJ_NULL) {
return member;
mp_obj_t member[2] = {MP_OBJ_NULL};
mp_obj_class_lookup(self, self->base.type, MP_QSTR___call__, offsetof(mp_obj_type_t, call), member);
if (member[0] == MP_OBJ_NULL) {
return MP_OBJ_NULL;
}
if (member[0] == MP_OBJ_SENTINEL) {
return mp_call_function_n_kw(self->subobj[0], n_args, n_kw, args);
}
mp_obj_t meth = mp_obj_new_bound_meth(member, self);
mp_obj_t meth = mp_obj_new_bound_meth(member[0], self);
return mp_call_function_n_kw(meth, n_args, n_kw, args);
}
......@@ -403,21 +515,22 @@ STATIC void type_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
return;
}
#endif
mp_obj_t member = mp_obj_class_lookup(self, attr);
if (member != MP_OBJ_NULL) {
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, &mp_type_staticmethod)) {
if (MP_OBJ_IS_TYPE(member[0], &mp_type_staticmethod)) {
// return just the function
dest[0] = ((mp_obj_static_class_method_t*)member)->fun;
} else if (MP_OBJ_IS_TYPE(member, &mp_type_classmethod)) {
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)->fun;
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] = (mp_obj_t)member;
dest[0] = member[0];
}
}
}
......@@ -474,6 +587,20 @@ const mp_obj_type_t mp_type_type = {
mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict) {
assert(MP_OBJ_IS_TYPE(bases_tuple, &mp_type_tuple)); // Micro Python restriction, for now
assert(MP_OBJ_IS_TYPE(locals_dict, &mp_type_dict)); // Micro Python restriction, for now
// Basic validation of base classes
uint len;
mp_obj_t *items;
mp_obj_tuple_get(bases_tuple, &len, &items);
for (uint i = 0; i < len; i++) {
assert(MP_OBJ_IS_TYPE(items[i], &mp_type_type));
mp_obj_type_t *t = items[i];
// TODO: Verify with CPy, tested on function type
if (t->make_new == NULL) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "type '%s' is not an acceptable base type", qstr_str(t->name)));
}
}
mp_obj_type_t *o = m_new0(mp_obj_type_t, 1);
o->base.type = &mp_type_type;
o->name = name;
......@@ -487,6 +614,13 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
o->call = class_call;
o->bases_tuple = bases_tuple;
o->locals_dict = locals_dict;
const mp_obj_type_t *native_base;
uint num_native_bases = class_count_native_bases(o, &native_base);
if (num_native_bases > 1) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "multiple bases have instance lay-out conflict"));
}
return o;
}
......@@ -536,9 +670,10 @@ 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 = mp_obj_class_lookup((mp_obj_type_t*)items[i], attr);
if (member != MP_OBJ_NULL) {
class_convert_return_attr(self->obj, member, dest);
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) {
class_convert_return_attr(self->obj, member[0], dest);
return;
}
}
......
tests/basics/subclass-native1.py 0 → 100644
View file @ 37977b7b
class mylist(list):
pass
a = mylist([1, 2, 5])
# Test setting instance attr
a.attr = "something"
# Test base type __str__
print(a)
# Test getting instance attr
print(a.attr)
# Test base type ->subscr
print(a[-1])
a[0] = -1
print(a)
# Test another base type unary op
print(len(a))
# Test binary op of base type, with 2nd arg being raw base type
print(a + [20, 30, 40])
# Test binary op of base type, with 2nd arg being same class as 1st arg
# TODO: Faults
#print(a + a)
def foo():
print("hello from foo")
try:
class myfunc(type(foo)):
pass
except TypeError:
print("TypeError")
tests/basics/subclass-native2.py 0 → 100644
View file @ 37977b7b
class Base1:
def __init__(self, *args):
print("Base1.__init__",args)
class Clist1(Base1, list):
pass
class Ctuple1(Base1, tuple):
pass
a = Clist1()
print(len(a))
a = Clist1([1, 2, 3])
print(len(a))
a = Ctuple1()
print(len(a))
a = Ctuple1([1, 2, 3])
# TODO: Faults
#print(len(a))
print("---")
class Clist2(list, Base1):
pass
class Ctuple2(tuple, Base1):
pass
a = Clist2()
print(len(a))
a = Clist2([1, 2, 3])
print(len(a))
#a = Ctuple2()
#print(len(a))
#a = Ctuple2([1, 2, 3])
#print(len(a))
tests/basics/subclass-native3.py 0 → 100644
View file @ 37977b7b
class MyExc(Exception):
pass
e = MyExc(100, "Some error")
print(e)
# TODO: Prints native base class name
#print(repr(e))
print(e.args)
tests/basics/subclass-native4.py 0 → 100644
View file @ 37977b7b
# Test calling non-special method inherited from native type
class mylist(list):
pass
l = mylist([1, 2, 3])
print(l)
l.append(10)
print(l)
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