py/objtuple.c - lite/micropython - Linaro Git Browser

 /*
  * This file is part of the Micro Python project, http://micropython.org/
  *
  * The MIT License (MIT)
  *
  * Copyright (c) 2013, 2014 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
  * 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/nlr.h"
 #include "py/objtuple.h"
 #include "py/runtime0.h"
 #include "py/runtime.h"

 STATIC mp_obj_t mp_obj_new_tuple_iterator(mp_obj_tuple_t *tuple, mp_uint_t cur);

 /******************************************************************************/
 /* tuple                                                                      */

 void mp_obj_tuple_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
     mp_obj_tuple_t *o = MP_OBJ_TO_PTR(o_in);
     if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
         mp_print_str(print, "[");
     } else {
         mp_print_str(print, "(");
         kind = PRINT_REPR;
     }
     for (mp_uint_t i = 0; i < o->len; i++) {
         if (i > 0) {
             mp_print_str(print, ", ");
         }
         mp_obj_print_helper(print, o->items[i], kind);
     }
     if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
         mp_print_str(print, "]");
     } else {
         if (o->len == 1) {
             mp_print_str(print, ",");
         }
         mp_print_str(print, ")");
     }
 }

 STATIC mp_obj_t mp_obj_tuple_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
     (void)type_in;

     mp_arg_check_num(n_args, n_kw, 0, 1, false);

     switch (n_args) {
         case 0:
             // return a empty tuple
             return mp_const_empty_tuple;

         case 1:
         default: {
             // 1 argument, an iterable from which we make a new tuple
             if (MP_OBJ_IS_TYPE(args[0], &mp_type_tuple)) {
                 return args[0];
             }

             // TODO optimise for cases where we know the length of the iterator

             mp_uint_t alloc = 4;
             mp_uint_t len = 0;
             mp_obj_t *items = m_new(mp_obj_t, alloc);

             mp_obj_t iterable = mp_getiter(args[0]);
             mp_obj_t item;
             while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
                 if (len >= alloc) {
                     items = m_renew(mp_obj_t, items, alloc, alloc * 2);
                     alloc *= 2;
                 }
                 items[len++] = item;
             }

             mp_obj_t tuple = mp_obj_new_tuple(len, items);
             m_del(mp_obj_t, items, alloc);

             return tuple;
         }
     }
 }

 // Don't pass MP_BINARY_OP_NOT_EQUAL here
 STATIC bool tuple_cmp_helper(mp_uint_t op, mp_obj_t self_in, mp_obj_t another_in) {
     // type check is done on getiter method to allow tuple, namedtuple, attrtuple
     mp_check_self(mp_obj_get_type(self_in)->getiter == mp_obj_tuple_getiter);
     mp_obj_type_t *another_type = mp_obj_get_type(another_in);
     mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
     if (another_type->getiter != mp_obj_tuple_getiter) {
         // Slow path for user subclasses
         another_in = mp_instance_cast_to_native_base(another_in, MP_OBJ_FROM_PTR(&mp_type_tuple));
         if (another_in == MP_OBJ_NULL) {
             return false;
         }
     }
     mp_obj_tuple_t *another = MP_OBJ_TO_PTR(another_in);

     return mp_seq_cmp_objs(op, self->items, self->len, another->items, another->len);
 }

 mp_obj_t mp_obj_tuple_unary_op(mp_uint_t op, mp_obj_t self_in) {
     mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
     switch (op) {
         case MP_UNARY_OP_BOOL: return mp_obj_new_bool(self->len != 0);
         case MP_UNARY_OP_HASH: {
             // start hash with pointer to empty tuple, to make it fairly unique
             mp_int_t hash = (mp_int_t)mp_const_empty_tuple;
             for (mp_uint_t i = 0; i < self->len; i++) {
                 hash += MP_OBJ_SMALL_INT_VALUE(mp_unary_op(MP_UNARY_OP_HASH, self->items[i]));
             }
             return MP_OBJ_NEW_SMALL_INT(hash);
         }
         case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->len);
         default: return MP_OBJ_NULL; // op not supported
     }
 }

 mp_obj_t mp_obj_tuple_binary_op(mp_uint_t op, mp_obj_t lhs, mp_obj_t rhs) {
     mp_obj_tuple_t *o = MP_OBJ_TO_PTR(lhs);
     switch (op) {
         case MP_BINARY_OP_ADD: {
             if (!mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(rhs)), MP_OBJ_FROM_PTR(&mp_type_tuple))) {
                 return MP_OBJ_NULL; // op not supported
             }
             mp_obj_tuple_t *p = MP_OBJ_TO_PTR(rhs);
             mp_obj_tuple_t *s = MP_OBJ_TO_PTR(mp_obj_new_tuple(o->len + p->len, NULL));
             mp_seq_cat(s->items, o->items, o->len, p->items, p->len, mp_obj_t);
             return MP_OBJ_FROM_PTR(s);
         }
         case MP_BINARY_OP_MULTIPLY: {
             mp_int_t n;
             if (!mp_obj_get_int_maybe(rhs, &n)) {
                 return MP_OBJ_NULL; // op not supported
             }
             if (n <= 0) {
                 return mp_const_empty_tuple;
             }
             mp_obj_tuple_t *s = MP_OBJ_TO_PTR(mp_obj_new_tuple(o->len * n, NULL));
             mp_seq_multiply(o->items, sizeof(*o->items), o->len, n, s->items);
             return MP_OBJ_FROM_PTR(s);
         }
         case MP_BINARY_OP_EQUAL:
         case MP_BINARY_OP_LESS:
         case MP_BINARY_OP_LESS_EQUAL:
         case MP_BINARY_OP_MORE:
         case MP_BINARY_OP_MORE_EQUAL:
             return mp_obj_new_bool(tuple_cmp_helper(op, lhs, rhs));

         default:
             return MP_OBJ_NULL; // op not supported
     }
 }

 mp_obj_t mp_obj_tuple_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
     if (value == MP_OBJ_SENTINEL) {
         // load
         mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
 #if MICROPY_PY_BUILTINS_SLICE
         if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
             mp_bound_slice_t slice;
             if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
                 mp_not_implemented("only slices with step=1 (aka None) are supported");
             }
             mp_obj_tuple_t *res = MP_OBJ_TO_PTR(mp_obj_new_tuple(slice.stop - slice.start, NULL));
             mp_seq_copy(res->items, self->items + slice.start, res->len, mp_obj_t);
             return MP_OBJ_FROM_PTR(res);
         }
 #endif
         mp_uint_t index_value = mp_get_index(self->base.type, self->len, index, false);
         return self->items[index_value];
     } else {
         return MP_OBJ_NULL; // op not supported
     }
 }

 mp_obj_t mp_obj_tuple_getiter(mp_obj_t o_in) {
     return mp_obj_new_tuple_iterator(MP_OBJ_TO_PTR(o_in), 0);
 }

 STATIC mp_obj_t tuple_count(mp_obj_t self_in, mp_obj_t value) {
     mp_check_self(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
     mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
     return mp_seq_count_obj(self->items, self->len, value);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_2(tuple_count_obj, tuple_count);

 STATIC mp_obj_t tuple_index(size_t n_args, const mp_obj_t *args) {
     mp_check_self(MP_OBJ_IS_TYPE(args[0], &mp_type_tuple));
     mp_obj_tuple_t *self = MP_OBJ_TO_PTR(args[0]);
     return mp_seq_index_obj(self->items, self->len, n_args, args);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(tuple_index_obj, 2, 4, tuple_index);

 STATIC const mp_rom_map_elem_t tuple_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_count), MP_ROM_PTR(&tuple_count_obj) },
     { MP_ROM_QSTR(MP_QSTR_index), MP_ROM_PTR(&tuple_index_obj) },
 };

 STATIC MP_DEFINE_CONST_DICT(tuple_locals_dict, tuple_locals_dict_table);

 const mp_obj_type_t mp_type_tuple = {
     { &mp_type_type },
     .name = MP_QSTR_tuple,
     .print = mp_obj_tuple_print,
     .make_new = mp_obj_tuple_make_new,
     .unary_op = mp_obj_tuple_unary_op,
     .binary_op = mp_obj_tuple_binary_op,
     .subscr = mp_obj_tuple_subscr,
     .getiter = mp_obj_tuple_getiter,
     .locals_dict = (mp_obj_dict_t*)&tuple_locals_dict,
 };

 // the zero-length tuple
 const mp_obj_tuple_t mp_const_empty_tuple_obj = {{&mp_type_tuple}, 0};

 mp_obj_t mp_obj_new_tuple(mp_uint_t n, const mp_obj_t *items) {
     if (n == 0) {
         return mp_const_empty_tuple;
     }
     mp_obj_tuple_t *o = m_new_obj_var(mp_obj_tuple_t, mp_obj_t, n);
     o->base.type = &mp_type_tuple;
     o->len = n;
     if (items) {
         for (mp_uint_t i = 0; i < n; i++) {
             o->items[i] = items[i];
         }
     }
     return MP_OBJ_FROM_PTR(o);
 }

 void mp_obj_tuple_get(mp_obj_t self_in, mp_uint_t *len, mp_obj_t **items) {
     assert(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
     mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
     *len = self->len;
     *items = &self->items[0];
 }

 void mp_obj_tuple_del(mp_obj_t self_in) {
     assert(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
     mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
     m_del_var(mp_obj_tuple_t, mp_obj_t, self->len, self);
 }

 /******************************************************************************/
 /* tuple iterator                                                             */

 typedef struct _mp_obj_tuple_it_t {
     mp_obj_base_t base;
     mp_fun_1_t iternext;
     mp_obj_tuple_t *tuple;
     mp_uint_t cur;
 } mp_obj_tuple_it_t;

 STATIC mp_obj_t tuple_it_iternext(mp_obj_t self_in) {
     mp_obj_tuple_it_t *self = MP_OBJ_TO_PTR(self_in);
     if (self->cur < self->tuple->len) {
         mp_obj_t o_out = self->tuple->items[self->cur];
         self->cur += 1;
         return o_out;
     } else {
         return MP_OBJ_STOP_ITERATION;
     }
 }

 STATIC mp_obj_t mp_obj_new_tuple_iterator(mp_obj_tuple_t *tuple, mp_uint_t cur) {
     mp_obj_tuple_it_t *o = m_new_obj(mp_obj_tuple_it_t);
     o->base.type = &mp_type_polymorph_iter;
     o->iternext = tuple_it_iternext;
     o->tuple = tuple;
     o->cur = cur;
     return MP_OBJ_FROM_PTR(o);
 }
	/*
	* This file is part of the Micro Python project, http://micropython.org/
	*
	* The MIT License (MIT)
	*
	* Copyright (c) 2013, 2014 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
	* 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/nlr.h"
	#include "py/objtuple.h"
	#include "py/runtime0.h"
	#include "py/runtime.h"

	STATIC mp_obj_t mp_obj_new_tuple_iterator(mp_obj_tuple_t *tuple, mp_uint_t cur);

	/******************************************************************************/
	/* tuple */

	void mp_obj_tuple_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
	mp_obj_tuple_t *o = MP_OBJ_TO_PTR(o_in);
	if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
	mp_print_str(print, "[");
	} else {
	mp_print_str(print, "(");
	kind = PRINT_REPR;
	}
	for (mp_uint_t i = 0; i < o->len; i++) {
	if (i > 0) {
	mp_print_str(print, ", ");
	}
	mp_obj_print_helper(print, o->items[i], kind);
	}
	if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
	mp_print_str(print, "]");
	} else {
	if (o->len == 1) {
	mp_print_str(print, ",");
	}
	mp_print_str(print, ")");
	}
	}

	STATIC mp_obj_t mp_obj_tuple_make_new(const mp_obj_type_t type_in, size_t n_args, size_t n_kw, const mp_obj_t args) {
	(void)type_in;

	mp_arg_check_num(n_args, n_kw, 0, 1, false);

	switch (n_args) {
	case 0:
	// return a empty tuple
	return mp_const_empty_tuple;

	case 1:
	default: {
	// 1 argument, an iterable from which we make a new tuple
	if (MP_OBJ_IS_TYPE(args[0], &mp_type_tuple)) {
	return args[0];
	}

	// TODO optimise for cases where we know the length of the iterator

	mp_uint_t alloc = 4;
	mp_uint_t len = 0;
	mp_obj_t *items = m_new(mp_obj_t, alloc);

	mp_obj_t iterable = mp_getiter(args[0]);
	mp_obj_t item;
	while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
	if (len >= alloc) {
	items = m_renew(mp_obj_t, items, alloc, alloc * 2);
	alloc *= 2;
	}
	items[len++] = item;
	}

	mp_obj_t tuple = mp_obj_new_tuple(len, items);
	m_del(mp_obj_t, items, alloc);

	return tuple;
	}
	}
	}

	// Don't pass MP_BINARY_OP_NOT_EQUAL here
	STATIC bool tuple_cmp_helper(mp_uint_t op, mp_obj_t self_in, mp_obj_t another_in) {
	// type check is done on getiter method to allow tuple, namedtuple, attrtuple
	mp_check_self(mp_obj_get_type(self_in)->getiter == mp_obj_tuple_getiter);
	mp_obj_type_t *another_type = mp_obj_get_type(another_in);
	mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
	if (another_type->getiter != mp_obj_tuple_getiter) {
	// Slow path for user subclasses
	another_in = mp_instance_cast_to_native_base(another_in, MP_OBJ_FROM_PTR(&mp_type_tuple));
	if (another_in == MP_OBJ_NULL) {
	return false;
	}
	}
	mp_obj_tuple_t *another = MP_OBJ_TO_PTR(another_in);

	return mp_seq_cmp_objs(op, self->items, self->len, another->items, another->len);
	}

	mp_obj_t mp_obj_tuple_unary_op(mp_uint_t op, mp_obj_t self_in) {
	mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
	switch (op) {
	case MP_UNARY_OP_BOOL: return mp_obj_new_bool(self->len != 0);
	case MP_UNARY_OP_HASH: {
	// start hash with pointer to empty tuple, to make it fairly unique
	mp_int_t hash = (mp_int_t)mp_const_empty_tuple;
	for (mp_uint_t i = 0; i < self->len; i++) {
	hash += MP_OBJ_SMALL_INT_VALUE(mp_unary_op(MP_UNARY_OP_HASH, self->items[i]));
	}
	return MP_OBJ_NEW_SMALL_INT(hash);
	}
	case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->len);
	default: return MP_OBJ_NULL; // op not supported
	}
	}

	mp_obj_t mp_obj_tuple_binary_op(mp_uint_t op, mp_obj_t lhs, mp_obj_t rhs) {
	mp_obj_tuple_t *o = MP_OBJ_TO_PTR(lhs);
	switch (op) {
	case MP_BINARY_OP_ADD: {
	if (!mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(rhs)), MP_OBJ_FROM_PTR(&mp_type_tuple))) {
	return MP_OBJ_NULL; // op not supported
	}
	mp_obj_tuple_t *p = MP_OBJ_TO_PTR(rhs);
	mp_obj_tuple_t *s = MP_OBJ_TO_PTR(mp_obj_new_tuple(o->len + p->len, NULL));
	mp_seq_cat(s->items, o->items, o->len, p->items, p->len, mp_obj_t);
	return MP_OBJ_FROM_PTR(s);
	}
	case MP_BINARY_OP_MULTIPLY: {
	mp_int_t n;
	if (!mp_obj_get_int_maybe(rhs, &n)) {
	return MP_OBJ_NULL; // op not supported
	}
	if (n <= 0) {
	return mp_const_empty_tuple;
	}
	mp_obj_tuple_t s = MP_OBJ_TO_PTR(mp_obj_new_tuple(o->len n, NULL));
	mp_seq_multiply(o->items, sizeof(*o->items), o->len, n, s->items);
	return MP_OBJ_FROM_PTR(s);
	}
	case MP_BINARY_OP_EQUAL:
	case MP_BINARY_OP_LESS:
	case MP_BINARY_OP_LESS_EQUAL:
	case MP_BINARY_OP_MORE:
	case MP_BINARY_OP_MORE_EQUAL:
	return mp_obj_new_bool(tuple_cmp_helper(op, lhs, rhs));

	default:
	return MP_OBJ_NULL; // op not supported
	}
	}

	mp_obj_t mp_obj_tuple_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
	if (value == MP_OBJ_SENTINEL) {
	// load
	mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
	#if MICROPY_PY_BUILTINS_SLICE
	if (MP_OBJ_IS_TYPE(index, &mp_type_slice)) {
	mp_bound_slice_t slice;
	if (!mp_seq_get_fast_slice_indexes(self->len, index, &slice)) {
	mp_not_implemented("only slices with step=1 (aka None) are supported");
	}
	mp_obj_tuple_t *res = MP_OBJ_TO_PTR(mp_obj_new_tuple(slice.stop - slice.start, NULL));
	mp_seq_copy(res->items, self->items + slice.start, res->len, mp_obj_t);
	return MP_OBJ_FROM_PTR(res);
	}
	#endif
	mp_uint_t index_value = mp_get_index(self->base.type, self->len, index, false);
	return self->items[index_value];
	} else {
	return MP_OBJ_NULL; // op not supported
	}
	}

	mp_obj_t mp_obj_tuple_getiter(mp_obj_t o_in) {
	return mp_obj_new_tuple_iterator(MP_OBJ_TO_PTR(o_in), 0);
	}

	STATIC mp_obj_t tuple_count(mp_obj_t self_in, mp_obj_t value) {
	mp_check_self(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
	mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
	return mp_seq_count_obj(self->items, self->len, value);
	}
	STATIC MP_DEFINE_CONST_FUN_OBJ_2(tuple_count_obj, tuple_count);

	STATIC mp_obj_t tuple_index(size_t n_args, const mp_obj_t *args) {
	mp_check_self(MP_OBJ_IS_TYPE(args[0], &mp_type_tuple));
	mp_obj_tuple_t *self = MP_OBJ_TO_PTR(args[0]);
	return mp_seq_index_obj(self->items, self->len, n_args, args);
	}
	STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(tuple_index_obj, 2, 4, tuple_index);

	STATIC const mp_rom_map_elem_t tuple_locals_dict_table[] = {
	{ MP_ROM_QSTR(MP_QSTR_count), MP_ROM_PTR(&tuple_count_obj) },
	{ MP_ROM_QSTR(MP_QSTR_index), MP_ROM_PTR(&tuple_index_obj) },
	};

	STATIC MP_DEFINE_CONST_DICT(tuple_locals_dict, tuple_locals_dict_table);

	const mp_obj_type_t mp_type_tuple = {
	{ &mp_type_type },
	.name = MP_QSTR_tuple,
	.print = mp_obj_tuple_print,
	.make_new = mp_obj_tuple_make_new,
	.unary_op = mp_obj_tuple_unary_op,
	.binary_op = mp_obj_tuple_binary_op,
	.subscr = mp_obj_tuple_subscr,
	.getiter = mp_obj_tuple_getiter,
	.locals_dict = (mp_obj_dict_t*)&tuple_locals_dict,
	};

	// the zero-length tuple
	const mp_obj_tuple_t mp_const_empty_tuple_obj = {{&mp_type_tuple}, 0};

	mp_obj_t mp_obj_new_tuple(mp_uint_t n, const mp_obj_t *items) {
	if (n == 0) {
	return mp_const_empty_tuple;
	}
	mp_obj_tuple_t *o = m_new_obj_var(mp_obj_tuple_t, mp_obj_t, n);
	o->base.type = &mp_type_tuple;
	o->len = n;
	if (items) {
	for (mp_uint_t i = 0; i < n; i++) {
	o->items[i] = items[i];
	}
	}
	return MP_OBJ_FROM_PTR(o);
	}

	void mp_obj_tuple_get(mp_obj_t self_in, mp_uint_t len, mp_obj_t *items) {
	assert(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
	mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
	*len = self->len;
	*items = &self->items[0];
	}

	void mp_obj_tuple_del(mp_obj_t self_in) {
	assert(MP_OBJ_IS_TYPE(self_in, &mp_type_tuple));
	mp_obj_tuple_t *self = MP_OBJ_TO_PTR(self_in);
	m_del_var(mp_obj_tuple_t, mp_obj_t, self->len, self);
	}

	/******************************************************************************/
	/* tuple iterator */

	typedef struct _mp_obj_tuple_it_t {
	mp_obj_base_t base;
	mp_fun_1_t iternext;
	mp_obj_tuple_t *tuple;
	mp_uint_t cur;
	} mp_obj_tuple_it_t;

	STATIC mp_obj_t tuple_it_iternext(mp_obj_t self_in) {
	mp_obj_tuple_it_t *self = MP_OBJ_TO_PTR(self_in);
	if (self->cur < self->tuple->len) {
	mp_obj_t o_out = self->tuple->items[self->cur];
	self->cur += 1;
	return o_out;
	} else {
	return MP_OBJ_STOP_ITERATION;
	}
	}

	STATIC mp_obj_t mp_obj_new_tuple_iterator(mp_obj_tuple_t *tuple, mp_uint_t cur) {
	mp_obj_tuple_it_t *o = m_new_obj(mp_obj_tuple_it_t);
	o->base.type = &mp_type_polymorph_iter;
	o->iternext = tuple_it_iternext;
	o->tuple = tuple;
	o->cur = cur;
	return MP_OBJ_FROM_PTR(o);
	}