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py/objset: Simplify set and frozenset by separating their locals dicts. 

A lot of set's methods (the mutable ones) are not allowed to operate on a
frozenset, and giving frozenset a separate locals dict with only the
methods that it supports allows to simplify the logic that verifies if
args are a set or a frozenset.  Even though the new frozenset locals dict
is relatively large (88 bytes on 32-bit archs) there is a much bigger
saving coming from the removal of a const string for an error message,
along with the removal of some checks for set or frozenset type.

Changes in code size due to this patch are (for ports that changed at all):

   unix x64:   -56
unix nanbox:  -304
      stm32:   -64
    esp8266:  -124
     cc3200:   -40

Apart from the reduced code, frozenset now has better tab-completion
because it only lists the valid methods.  And the error message for
accessing an invalid method is now more detailed (it includes the
method name that wasn't found).
pull/3310/head
Damien George 7 years ago
parent
8e0b9f495b
commit
01978648fd
1 changed files with 30 additions and 41 deletions
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  1. 71
      py/objset.c

71
py/objset.c
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@ -3,7 +3,7 @@
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2013-2017 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@ -57,23 +57,13 @@ STATIC bool is_set_or_frozenset(mp_obj_t o) {
;
}
// This macro is shorthand for mp_check_self to verify the argument is a set.
#define check_set(o) mp_check_self(MP_OBJ_IS_TYPE(o, &mp_type_set))
// This macro is shorthand for mp_check_self to verify the argument is a
// set or frozenset for methods that operate on both of these types.
#define check_set_or_frozenset(o) mp_check_self(is_set_or_frozenset(o))
// This function is used to verify the argument for methods that modify
// the set object, and raises an exception if the arg is a frozenset.
STATIC void check_set(mp_obj_t o) {
#if MICROPY_PY_BUILTINS_FROZENSET
if (MP_OBJ_IS_TYPE(o, &mp_type_frozenset)) {
// Mutable method called on frozenset; emulate CPython behavior, eg:
// AttributeError: 'frozenset' object has no attribute 'add'
mp_raise_msg(&mp_type_AttributeError, "'frozenset' has no such attribute");
}
#endif
mp_check_self(MP_OBJ_IS_TYPE(o, &mp_type_set));
}
STATIC void set_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_set_t *self = MP_OBJ_TO_PTR(self_in);
@ -188,26 +178,16 @@ STATIC mp_obj_t set_clear(mp_obj_t self_in) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(set_clear_obj, set_clear);
STATIC mp_obj_t set_copy_as_mutable(mp_obj_t self_in) {
STATIC mp_obj_t set_copy(mp_obj_t self_in) {
check_set_or_frozenset(self_in);
mp_obj_set_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_set_t *other = m_new_obj(mp_obj_set_t);
other->base.type = &mp_type_set;
other->base.type = self->base.type;
mp_set_init(&other->set, self->set.alloc);
other->set.used = self->set.used;
memcpy(other->set.table, self->set.table, self->set.alloc * sizeof(mp_obj_t));
return MP_OBJ_FROM_PTR(other);
}
STATIC mp_obj_t set_copy(mp_obj_t self_in) {
check_set_or_frozenset(self_in);
mp_obj_t other = set_copy_as_mutable(self_in);
((mp_obj_base_t*)MP_OBJ_TO_PTR(other))->type = ((mp_obj_base_t*)MP_OBJ_TO_PTR(self_in))->type;
return other;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(set_copy_obj, set_copy);
STATIC mp_obj_t set_discard(mp_obj_t self_in, mp_obj_t item) {
@ -224,25 +204,23 @@ STATIC mp_obj_t set_diff_int(size_t n_args, const mp_obj_t *args, bool update) {
check_set(args[0]);
self = args[0];
} else {
check_set_or_frozenset(args[0]);
self = set_copy_as_mutable(args[0]);
self = set_copy(args[0]);
}
for (size_t i = 1; i < n_args; i++) {
mp_obj_t other = args[i];
if (self == other) {
set_clear(self);
} else {
mp_set_t *self_set = &((mp_obj_set_t*)MP_OBJ_TO_PTR(self))->set;
mp_obj_t iter = mp_getiter(other, NULL);
mp_obj_t next;
while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
set_discard(self, next);
mp_set_lookup(self_set, next, MP_MAP_LOOKUP_REMOVE_IF_FOUND);
}
}
}
((mp_obj_base_t*)MP_OBJ_TO_PTR(self))->type = ((mp_obj_base_t*)MP_OBJ_TO_PTR(args[0]))->type;
return self;
}
@ -333,16 +311,16 @@ STATIC mp_obj_t set_issubset_internal(mp_obj_t self_in, mp_obj_t other_in, bool
other = MP_OBJ_TO_PTR(set_make_new(&mp_type_set, 1, 0, &other_in));
cleanup_other = true;
}
bool out = true;
mp_obj_t out = mp_const_true;
if (proper && self->set.used == other->set.used) {
out = false;
out = mp_const_false;
} else {
mp_obj_iter_buf_t iter_buf;
mp_obj_t iter = set_getiter(MP_OBJ_FROM_PTR(self), &iter_buf);
mp_obj_t next;
while ((next = set_it_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
if (!mp_set_lookup(&other->set, next, MP_MAP_LOOKUP)) {
out = false;
out = mp_const_false;
break;
}
}
@ -354,7 +332,7 @@ STATIC mp_obj_t set_issubset_internal(mp_obj_t self_in, mp_obj_t other_in, bool
if (cleanup_other) {
set_clear(MP_OBJ_FROM_PTR(other));
}
return mp_obj_new_bool(out);
return out;
}
STATIC mp_obj_t set_issubset(mp_obj_t self_in, mp_obj_t other_in) {
return set_issubset_internal(self_in, other_in, false);
@ -409,7 +387,7 @@ STATIC mp_obj_t set_remove(mp_obj_t self_in, mp_obj_t item) {
STATIC MP_DEFINE_CONST_FUN_OBJ_2(set_remove_obj, set_remove);
STATIC mp_obj_t set_symmetric_difference_update(mp_obj_t self_in, mp_obj_t other_in) {
check_set(self_in);
check_set_or_frozenset(self_in); // can be frozenset due to call from set_symmetric_difference
mp_obj_set_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_t iter = mp_getiter(other_in, NULL);
mp_obj_t next;
@ -421,10 +399,8 @@ STATIC mp_obj_t set_symmetric_difference_update(mp_obj_t self_in, mp_obj_t other
STATIC MP_DEFINE_CONST_FUN_OBJ_2(set_symmetric_difference_update_obj, set_symmetric_difference_update);
STATIC mp_obj_t set_symmetric_difference(mp_obj_t self_in, mp_obj_t other_in) {
check_set_or_frozenset(self_in);
mp_obj_t self_out = set_copy_as_mutable(self_in);
mp_obj_t self_out = set_copy(self_in);
set_symmetric_difference_update(self_out, other_in);
((mp_obj_base_t*)MP_OBJ_TO_PTR(self_out))->type = ((mp_obj_base_t*)MP_OBJ_TO_PTR(self_in))->type;
return self_out;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(set_symmetric_difference_obj, set_symmetric_difference);
@ -578,6 +554,19 @@ const mp_obj_type_t mp_type_set = {
};
#if MICROPY_PY_BUILTINS_FROZENSET
STATIC const mp_rom_map_elem_t frozenset_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_copy), MP_ROM_PTR(&set_copy_obj) },
{ MP_ROM_QSTR(MP_QSTR_difference), MP_ROM_PTR(&set_diff_obj) },
{ MP_ROM_QSTR(MP_QSTR_intersection), MP_ROM_PTR(&set_intersect_obj) },
{ MP_ROM_QSTR(MP_QSTR_isdisjoint), MP_ROM_PTR(&set_isdisjoint_obj) },
{ MP_ROM_QSTR(MP_QSTR_issubset), MP_ROM_PTR(&set_issubset_obj) },
{ MP_ROM_QSTR(MP_QSTR_issuperset), MP_ROM_PTR(&set_issuperset_obj) },
{ MP_ROM_QSTR(MP_QSTR_symmetric_difference), MP_ROM_PTR(&set_symmetric_difference_obj) },
{ MP_ROM_QSTR(MP_QSTR_union), MP_ROM_PTR(&set_union_obj) },
{ MP_ROM_QSTR(MP_QSTR___contains__), MP_ROM_PTR(&mp_op_contains_obj) },
};
STATIC MP_DEFINE_CONST_DICT(frozenset_locals_dict, frozenset_locals_dict_table);
const mp_obj_type_t mp_type_frozenset = {
{ &mp_type_type },
.name = MP_QSTR_frozenset,
@ -586,7 +575,7 @@ const mp_obj_type_t mp_type_frozenset = {
.unary_op = set_unary_op,
.binary_op = set_binary_op,
.getiter = set_getiter,
.locals_dict = (mp_obj_dict_t*)&set_locals_dict,
.locals_dict = (mp_obj_dict_t*)&frozenset_locals_dict,
};
#endif

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