/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 * Copyright (c) 2014-2017 Paul Sokolovsky
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <string.h>
#include <assert.h>

#include "py/runtime.h"
#include "py/builtin.h"
#include "py/objtype.h"
#include "py/objstr.h"

STATIC mp_obj_t dict_update(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs);

// This is a helper function to iterate through a dictionary. The state of
// the iteration is held in *cur and should be initialised with zero for the
// first call. Will return NULL when no more elements are available.
STATIC mp_map_elem_t *dict_iter_next(mp_obj_dict_t *dict, size_t *cur) {
 size_t max = dict->map.alloc;
 mp_map_t *map = &dict->map;

 size_t i = *cur;
 for (; i < max; i++) {
 if (mp_map_slot_is_filled(map, i)) {
 *cur = i + 1;
 return &(map->table[i]);
 }
 }

 assert(map->used == 0 || i == max);
 return NULL;
}

STATIC void dict_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 bool first = true;
 if (!(MICROPY_PY_UJSON && kind == PRINT_JSON)) {
 kind = PRINT_REPR;
 }
 if (MICROPY_PY_COLLECTIONS_ORDEREDDICT && self->base.type != &mp_type_dict && kind != PRINT_JSON) {
 mp_printf(print, "%q(", self->base.type->name);
 }
 mp_print_str(print, "{");
 size_t cur = 0;
 mp_map_elem_t *next = NULL;
 while ((next = dict_iter_next(self, &cur)) != NULL) {
 if (!first) {
 mp_print_str(print, ", ");
 }
 first = false;
 bool add_quote = MICROPY_PY_UJSON && kind == PRINT_JSON && !mp_obj_is_str_or_bytes(next->key);
 if (add_quote) {
 mp_print_str(print, "\"");
 }
 mp_obj_print_helper(print, next->key, kind);
 if (add_quote) {
 mp_print_str(print, "\"");
 }
 mp_print_str(print, ": ");
 mp_obj_print_helper(print, next->value, kind);
 }
 mp_print_str(print, "}");
 if (MICROPY_PY_COLLECTIONS_ORDEREDDICT && self->base.type != &mp_type_dict && kind != PRINT_JSON) {
 mp_print_str(print, ")");
 }
}

mp_obj_t mp_obj_dict_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
 mp_obj_t dict_out = mp_obj_new_dict(0);
 mp_obj_dict_t *dict = MP_OBJ_TO_PTR(dict_out);
 dict->base.type = type;
 #if MICROPY_PY_COLLECTIONS_ORDEREDDICT
 if (type == &mp_type_ordereddict) {
 dict->map.is_ordered = 1;
 }
 #endif
 if (n_args > 0 || n_kw > 0) {
 mp_obj_t args2[2] = {dict_out, args[0]}; // args[0] is always valid, even if it's not a positional arg
 mp_map_t kwargs;
 mp_map_init_fixed_table(&kwargs, n_kw, args + n_args);
 dict_update(n_args + 1, args2, &kwargs); // dict_update will check that n_args + 1 == 1 or 2
 }
 return dict_out;
}

STATIC mp_obj_t dict_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 switch (op) {
 case MP_UNARY_OP_BOOL:
 return mp_obj_new_bool(self->map.used != 0);
 case MP_UNARY_OP_LEN:
 return MP_OBJ_NEW_SMALL_INT(self->map.used);
 #if MICROPY_PY_SYS_GETSIZEOF
 case MP_UNARY_OP_SIZEOF: {
 size_t sz = sizeof(*self) + sizeof(*self->map.table) * self->map.alloc;
 return MP_OBJ_NEW_SMALL_INT(sz);
 }
 #endif
 default:
 return MP_OBJ_NULL; // op not supported
 }
}

STATIC mp_obj_t dict_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
 mp_obj_dict_t *o = MP_OBJ_TO_PTR(lhs_in);
 switch (op) {
 case MP_BINARY_OP_CONTAINS: {
 mp_map_elem_t *elem = mp_map_lookup(&o->map, rhs_in, MP_MAP_LOOKUP);
 return mp_obj_new_bool(elem != NULL);
 }
 case MP_BINARY_OP_EQUAL: {
 #if MICROPY_PY_COLLECTIONS_ORDEREDDICT
 if (MP_UNLIKELY(mp_obj_is_type(lhs_in, &mp_type_ordereddict) && mp_obj_is_type(rhs_in, &mp_type_ordereddict))) {
 // Iterate through both dictionaries simultaneously and compare keys and values.
 mp_obj_dict_t *rhs = MP_OBJ_TO_PTR(rhs_in);
 size_t c1 = 0, c2 = 0;
 mp_map_elem_t *e1 = dict_iter_next(o, &c1), *e2 = dict_iter_next(rhs, &c2);
 for (; e1 != NULL && e2 != NULL; e1 = dict_iter_next(o, &c1), e2 = dict_iter_next(rhs, &c2)) {
 if (!mp_obj_equal(e1->key, e2->key) || !mp_obj_equal(e1->value, e2->value)) {
 return mp_const_false;
 }
 }
 return e1 == NULL && e2 == NULL ? mp_const_true : mp_const_false;
 }
 #endif

 if (mp_obj_is_type(rhs_in, &mp_type_dict)) {
 mp_obj_dict_t *rhs = MP_OBJ_TO_PTR(rhs_in);
 if (o->map.used != rhs->map.used) {
 return mp_const_false;
 }

 size_t cur = 0;
 mp_map_elem_t *next = NULL;
 while ((next = dict_iter_next(o, &cur)) != NULL) {
 mp_map_elem_t *elem = mp_map_lookup(&rhs->map, next->key, MP_MAP_LOOKUP);
 if (elem == NULL || !mp_obj_equal(next->value, elem->value)) {
 return mp_const_false;
 }
 }
 return mp_const_true;
 } else {
 // dict is not equal to instance of any other type
 return mp_const_false;
 }
 }
 default:
 // op not supported
 return MP_OBJ_NULL;
 }
}

// Note: Make sure this is inlined in load part of dict_subscr() below.
mp_obj_t mp_obj_dict_get(mp_obj_t self_in, mp_obj_t index) {
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 mp_map_elem_t *elem = mp_map_lookup(&self->map, index, MP_MAP_LOOKUP);
 if (elem == NULL) {
 nlr_raise(mp_obj_new_exception_arg1(&mp_type_KeyError, index));
 } else {
 return elem->value;
 }
}

STATIC mp_obj_t dict_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
 if (value == MP_OBJ_NULL) {
 // delete
 mp_obj_dict_delete(self_in, index);
 return mp_const_none;
 } else if (value == MP_OBJ_SENTINEL) {
 // load
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 mp_map_elem_t *elem = mp_map_lookup(&self->map, index, MP_MAP_LOOKUP);
 if (elem == NULL) {
 nlr_raise(mp_obj_new_exception_arg1(&mp_type_KeyError, index));
 } else {
 return elem->value;
 }
 } else {
 // store
 mp_obj_dict_store(self_in, index, value);
 return mp_const_none;
 }
}

/******************************************************************************/
/* dict methods */

STATIC void mp_ensure_not_fixed(const mp_obj_dict_t *dict) {
 if (dict->map.is_fixed) {
 mp_raise_TypeError(NULL);
 }
}

STATIC mp_obj_t dict_clear(mp_obj_t self_in) {
 mp_check_self(mp_obj_is_dict_or_ordereddict(self_in));
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 mp_ensure_not_fixed(self);

 mp_map_clear(&self->map);

 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_clear_obj, dict_clear);

mp_obj_t mp_obj_dict_copy(mp_obj_t self_in) {
 mp_check_self(mp_obj_is_dict_or_ordereddict(self_in));
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 mp_obj_t other_out = mp_obj_new_dict(self->map.alloc);
 mp_obj_dict_t *other = MP_OBJ_TO_PTR(other_out);
 other->base.type = self->base.type;
 other->map.used = self->map.used;
 other->map.all_keys_are_qstrs = self->map.all_keys_are_qstrs;
 other->map.is_fixed = 0;
 other->map.is_ordered = self->map.is_ordered;
 memcpy(other->map.table, self->map.table, self->map.alloc * sizeof(mp_map_elem_t));
 return other_out;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_copy_obj, mp_obj_dict_copy);

#if MICROPY_PY_BUILTINS_DICT_FROMKEYS
// this is a classmethod
STATIC mp_obj_t dict_fromkeys(size_t n_args, const mp_obj_t *args) {
 mp_obj_t iter = mp_getiter(args[1], NULL);
 mp_obj_t value = mp_const_none;
 mp_obj_t next = MP_OBJ_NULL;

 if (n_args > 2) {
 value = args[2];
 }

 // optimisation to allocate result based on len of argument
 mp_obj_t self_out;
 mp_obj_t len = mp_obj_len_maybe(args[1]);
 if (len == MP_OBJ_NULL) {
 /* object's type doesn't have a __len__ slot */
 self_out = mp_obj_new_dict(0);
 } else {
 self_out = mp_obj_new_dict(MP_OBJ_SMALL_INT_VALUE(len));
 }

 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_out);
 while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
 mp_map_lookup(&self->map, next, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
 }

 return self_out;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_fromkeys_fun_obj, 2, 3, dict_fromkeys);
STATIC MP_DEFINE_CONST_CLASSMETHOD_OBJ(dict_fromkeys_obj, MP_ROM_PTR(&dict_fromkeys_fun_obj));
#endif

STATIC mp_obj_t dict_get_helper(size_t n_args, const mp_obj_t *args, mp_map_lookup_kind_t lookup_kind) {
 mp_check_self(mp_obj_is_dict_or_ordereddict(args[0]));
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(args[0]);
 if (lookup_kind != MP_MAP_LOOKUP) {
 mp_ensure_not_fixed(self);
 }
 mp_map_elem_t *elem = mp_map_lookup(&self->map, args[1], lookup_kind);
 mp_obj_t value;
 if (elem == NULL || elem->value == MP_OBJ_NULL) {
 if (n_args == 2) {
 if (lookup_kind == MP_MAP_LOOKUP_REMOVE_IF_FOUND) {
 nlr_raise(mp_obj_new_exception_arg1(&mp_type_KeyError, args[1]));
 } else {
 value = mp_const_none;
 }
 } else {
 value = args[2];
 }
 if (lookup_kind == MP_MAP_LOOKUP_ADD_IF_NOT_FOUND) {
 elem->value = value;
 }
 } else {
 value = elem->value;
 if (lookup_kind == MP_MAP_LOOKUP_REMOVE_IF_FOUND) {
 elem->value = MP_OBJ_NULL; // so that GC can collect the deleted value
 }
 }
 return value;
}

STATIC mp_obj_t dict_get(size_t n_args, const mp_obj_t *args) {
 return dict_get_helper(n_args, args, MP_MAP_LOOKUP);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_get_obj, 2, 3, dict_get);

STATIC mp_obj_t dict_pop(size_t n_args, const mp_obj_t *args) {
 return dict_get_helper(n_args, args, MP_MAP_LOOKUP_REMOVE_IF_FOUND);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_pop_obj, 2, 3, dict_pop);

STATIC mp_obj_t dict_setdefault(size_t n_args, const mp_obj_t *args) {
 return dict_get_helper(n_args, args, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(dict_setdefault_obj, 2, 3, dict_setdefault);

STATIC mp_obj_t dict_popitem(mp_obj_t self_in) {
 mp_check_self(mp_obj_is_dict_or_ordereddict(self_in));
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 mp_ensure_not_fixed(self);
 if (self->map.used == 0) {
 mp_raise_msg(&mp_type_KeyError, MP_ERROR_TEXT("popitem(): dictionary is empty"));
 }
 size_t cur = 0;
 #if MICROPY_PY_COLLECTIONS_ORDEREDDICT
 if (self->map.is_ordered) {
 cur = self->map.used - 1;
 }
 #endif
 mp_map_elem_t *next = dict_iter_next(self, &cur);
 assert(next);
 self->map.used--;
 mp_obj_t items[] = {next->key, next->value};
 next->key = MP_OBJ_SENTINEL; // must mark key as sentinel to indicate that it was deleted
 next->value = MP_OBJ_NULL;
 mp_obj_t tuple = mp_obj_new_tuple(2, items);

 return tuple;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_popitem_obj, dict_popitem);

STATIC mp_obj_t dict_update(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
 mp_check_self(mp_obj_is_dict_or_ordereddict(args[0]));
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(args[0]);
 mp_ensure_not_fixed(self);

 mp_arg_check_num(n_args, kwargs->used, 1, 2, true);

 if (n_args == 2) {
 // given a positional argument

 if (mp_obj_is_dict_or_ordereddict(args[1])) {
 // update from other dictionary (make sure other is not self)
 if (args[1] != args[0]) {
 size_t cur = 0;
 mp_map_elem_t *elem = NULL;
 while ((elem = dict_iter_next((mp_obj_dict_t *)MP_OBJ_TO_PTR(args[1]), &cur)) != NULL) {
 mp_map_lookup(&self->map, elem->key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = elem->value;
 }
 }
 } else {
 // update from a generic iterable of pairs
 mp_obj_t iter = mp_getiter(args[1], NULL);
 mp_obj_t next = MP_OBJ_NULL;
 while ((next = mp_iternext(iter)) != MP_OBJ_STOP_ITERATION) {
 mp_obj_t inneriter = mp_getiter(next, NULL);
 mp_obj_t key = mp_iternext(inneriter);
 mp_obj_t value = mp_iternext(inneriter);
 mp_obj_t stop = mp_iternext(inneriter);
 if (key == MP_OBJ_STOP_ITERATION
 || value == MP_OBJ_STOP_ITERATION
 || stop != MP_OBJ_STOP_ITERATION) {
 mp_raise_ValueError(MP_ERROR_TEXT("dict update sequence has wrong length"));
 } else {
 mp_map_lookup(&self->map, key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
 }
 }
 }
 }

 // update the dict with any keyword args
 for (size_t i = 0; i < kwargs->alloc; i++) {
 if (mp_map_slot_is_filled(kwargs, i)) {
 mp_map_lookup(&self->map, kwargs->table[i].key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = kwargs->table[i].value;
 }
 }

 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_KW(dict_update_obj, 1, dict_update);


/******************************************************************************/
/* dict views */

STATIC const mp_obj_type_t dict_view_type;
STATIC const mp_obj_type_t dict_view_it_type;

typedef enum _mp_dict_view_kind_t {
 MP_DICT_VIEW_ITEMS,
 MP_DICT_VIEW_KEYS,
 MP_DICT_VIEW_VALUES,
} mp_dict_view_kind_t;

STATIC const char *const mp_dict_view_names[] = {"dict_items", "dict_keys", "dict_values"};

typedef struct _mp_obj_dict_view_it_t {
 mp_obj_base_t base;
 mp_dict_view_kind_t kind;
 mp_obj_t dict;
 size_t cur;
} mp_obj_dict_view_it_t;

typedef struct _mp_obj_dict_view_t {
 mp_obj_base_t base;
 mp_obj_t dict;
 mp_dict_view_kind_t kind;
} mp_obj_dict_view_t;

STATIC mp_obj_t dict_view_it_iternext(mp_obj_t self_in) {
 mp_check_self(mp_obj_is_type(self_in, &dict_view_it_type));
 mp_obj_dict_view_it_t *self = MP_OBJ_TO_PTR(self_in);
 mp_map_elem_t *next = dict_iter_next(MP_OBJ_TO_PTR(self->dict), &self->cur);

 if (next == NULL) {
 return MP_OBJ_STOP_ITERATION;
 } else {
 switch (self->kind) {
 case MP_DICT_VIEW_ITEMS:
 default: {
 mp_obj_t items[] = {next->key, next->value};
 return mp_obj_new_tuple(2, items);
 }
 case MP_DICT_VIEW_KEYS:
 return next->key;
 case MP_DICT_VIEW_VALUES:
 return next->value;
 }
 }
}

STATIC const mp_obj_type_t dict_view_it_type = {
 { &mp_type_type },
 .name = MP_QSTR_iterator,
 .getiter = mp_identity_getiter,
 .iternext = dict_view_it_iternext,
};

STATIC mp_obj_t dict_view_getiter(mp_obj_t view_in, mp_obj_iter_buf_t *iter_buf) {
 assert(sizeof(mp_obj_dict_view_it_t) <= sizeof(mp_obj_iter_buf_t));
 mp_check_self(mp_obj_is_type(view_in, &dict_view_type));
 mp_obj_dict_view_t *view = MP_OBJ_TO_PTR(view_in);
 mp_obj_dict_view_it_t *o = (mp_obj_dict_view_it_t *)iter_buf;
 o->base.type = &dict_view_it_type;
 o->kind = view->kind;
 o->dict = view->dict;
 o->cur = 0;
 return MP_OBJ_FROM_PTR(o);
}

STATIC void dict_view_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
 (void)kind;
 mp_check_self(mp_obj_is_type(self_in, &dict_view_type));
 mp_obj_dict_view_t *self = MP_OBJ_TO_PTR(self_in);
 bool first = true;
 mp_print_str(print, mp_dict_view_names[self->kind]);
 mp_print_str(print, "([");
 mp_obj_iter_buf_t iter_buf;
 mp_obj_t self_iter = dict_view_getiter(self_in, &iter_buf);
 mp_obj_t next = MP_OBJ_NULL;
 while ((next = dict_view_it_iternext(self_iter)) != MP_OBJ_STOP_ITERATION) {
 if (!first) {
 mp_print_str(print, ", ");
 }
 first = false;
 mp_obj_print_helper(print, next, PRINT_REPR);
 }
 mp_print_str(print, "])");
}

STATIC mp_obj_t dict_view_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
 // only supported for the 'keys' kind until sets and dicts are refactored
 mp_obj_dict_view_t *o = MP_OBJ_TO_PTR(lhs_in);
 if (o->kind != MP_DICT_VIEW_KEYS) {
 return MP_OBJ_NULL; // op not supported
 }
 if (op != MP_BINARY_OP_CONTAINS) {
 return MP_OBJ_NULL; // op not supported
 }
 return dict_binary_op(op, o->dict, rhs_in);
}

STATIC const mp_obj_type_t dict_view_type = {
 { &mp_type_type },
 .name = MP_QSTR_dict_view,
 .print = dict_view_print,
 .binary_op = dict_view_binary_op,
 .getiter = dict_view_getiter,
};

STATIC mp_obj_t mp_obj_new_dict_view(mp_obj_t dict, mp_dict_view_kind_t kind) {
 mp_obj_dict_view_t *o = m_new_obj(mp_obj_dict_view_t);
 o->base.type = &dict_view_type;
 o->dict = dict;
 o->kind = kind;
 return MP_OBJ_FROM_PTR(o);
}

STATIC mp_obj_t dict_view(mp_obj_t self_in, mp_dict_view_kind_t kind) {
 mp_check_self(mp_obj_is_dict_or_ordereddict(self_in));
 return mp_obj_new_dict_view(self_in, kind);
}

STATIC mp_obj_t dict_items(mp_obj_t self_in) {
 return dict_view(self_in, MP_DICT_VIEW_ITEMS);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_items_obj, dict_items);

STATIC mp_obj_t dict_keys(mp_obj_t self_in) {
 return dict_view(self_in, MP_DICT_VIEW_KEYS);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_keys_obj, dict_keys);

STATIC mp_obj_t dict_values(mp_obj_t self_in) {
 return dict_view(self_in, MP_DICT_VIEW_VALUES);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(dict_values_obj, dict_values);

/******************************************************************************/
/* dict iterator */

STATIC mp_obj_t dict_getiter(mp_obj_t self_in, mp_obj_iter_buf_t *iter_buf) {
 assert(sizeof(mp_obj_dict_view_it_t) <= sizeof(mp_obj_iter_buf_t));
 mp_check_self(mp_obj_is_dict_or_ordereddict(self_in));
 mp_obj_dict_view_it_t *o = (mp_obj_dict_view_it_t *)iter_buf;
 o->base.type = &dict_view_it_type;
 o->kind = MP_DICT_VIEW_KEYS;
 o->dict = self_in;
 o->cur = 0;
 return MP_OBJ_FROM_PTR(o);
}

/******************************************************************************/
/* dict constructors & public C API */

STATIC const mp_rom_map_elem_t dict_locals_dict_table[] = {
 { MP_ROM_QSTR(MP_QSTR_clear), MP_ROM_PTR(&dict_clear_obj) },
 { MP_ROM_QSTR(MP_QSTR_copy), MP_ROM_PTR(&dict_copy_obj) },
 #if MICROPY_PY_BUILTINS_DICT_FROMKEYS
 { MP_ROM_QSTR(MP_QSTR_fromkeys), MP_ROM_PTR(&dict_fromkeys_obj) },
 #endif
 { MP_ROM_QSTR(MP_QSTR_get), MP_ROM_PTR(&dict_get_obj) },
 { MP_ROM_QSTR(MP_QSTR_items), MP_ROM_PTR(&dict_items_obj) },
 { MP_ROM_QSTR(MP_QSTR_keys), MP_ROM_PTR(&dict_keys_obj) },
 { MP_ROM_QSTR(MP_QSTR_pop), MP_ROM_PTR(&dict_pop_obj) },
 { MP_ROM_QSTR(MP_QSTR_popitem), MP_ROM_PTR(&dict_popitem_obj) },
 { MP_ROM_QSTR(MP_QSTR_setdefault), MP_ROM_PTR(&dict_setdefault_obj) },
 { MP_ROM_QSTR(MP_QSTR_update), MP_ROM_PTR(&dict_update_obj) },
 { MP_ROM_QSTR(MP_QSTR_values), MP_ROM_PTR(&dict_values_obj) },
 { MP_ROM_QSTR(MP_QSTR___getitem__), MP_ROM_PTR(&mp_op_getitem_obj) },
 { MP_ROM_QSTR(MP_QSTR___setitem__), MP_ROM_PTR(&mp_op_setitem_obj) },
 { MP_ROM_QSTR(MP_QSTR___delitem__), MP_ROM_PTR(&mp_op_delitem_obj) },
};

STATIC MP_DEFINE_CONST_DICT(dict_locals_dict, dict_locals_dict_table);

const mp_obj_type_t mp_type_dict = {
 { &mp_type_type },
 .name = MP_QSTR_dict,
 .print = dict_print,
 .make_new = mp_obj_dict_make_new,
 .unary_op = dict_unary_op,
 .binary_op = dict_binary_op,
 .subscr = dict_subscr,
 .getiter = dict_getiter,
 .locals_dict = (mp_obj_dict_t *)&dict_locals_dict,
};

#if MICROPY_PY_COLLECTIONS_ORDEREDDICT
const mp_obj_type_t mp_type_ordereddict = {
 { &mp_type_type },
 .name = MP_QSTR_OrderedDict,
 .print = dict_print,
 .make_new = mp_obj_dict_make_new,
 .unary_op = dict_unary_op,
 .binary_op = dict_binary_op,
 .subscr = dict_subscr,
 .getiter = dict_getiter,
 .parent = &mp_type_dict,
 .locals_dict = (mp_obj_dict_t *)&dict_locals_dict,
};
#endif

void mp_obj_dict_init(mp_obj_dict_t *dict, size_t n_args) {
 dict->base.type = &mp_type_dict;
 mp_map_init(&dict->map, n_args);
}

mp_obj_t mp_obj_new_dict(size_t n_args) {
 mp_obj_dict_t *o = m_new_obj(mp_obj_dict_t);
 mp_obj_dict_init(o, n_args);
 return MP_OBJ_FROM_PTR(o);
}

size_t mp_obj_dict_len(mp_obj_t self_in) {
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 return self->map.used;
}

mp_obj_t mp_obj_dict_store(mp_obj_t self_in, mp_obj_t key, mp_obj_t value) {
 mp_check_self(mp_obj_is_dict_or_ordereddict(self_in));
 mp_obj_dict_t *self = MP_OBJ_TO_PTR(self_in);
 mp_ensure_not_fixed(self);
 mp_map_lookup(&self->map, key, MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = value;
 return self_in;
}

mp_obj_t mp_obj_dict_delete(mp_obj_t self_in, mp_obj_t key) {
 mp_obj_t args[2] = {self_in, key};
 dict_get_helper(2, args, MP_MAP_LOOKUP_REMOVE_IF_FOUND);
 return self_in;
}