1/*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2013, 2014 Damien P. George
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27#include <string.h>
28
29#include "py/obj.h"
30#include "py/runtime.h"
31
32typedef struct _mp_obj_closure_t {
33 mp_obj_base_t base;
34 mp_obj_t fun;
35 size_t n_closed;
36 mp_obj_t closed[];
37} mp_obj_closure_t;
38
39STATIC mp_obj_t closure_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
40 mp_obj_closure_t *self = MP_OBJ_TO_PTR(self_in);
41
42 // need to concatenate closed-over-vars and args
43
44 size_t n_total = self->n_closed + n_args + 2 * n_kw;
45 if (n_total <= 5) {
46 // use stack to allocate temporary args array
47 mp_obj_t args2[5];
48 memcpy(args2, self->closed, self->n_closed * sizeof(mp_obj_t));
49 memcpy(args2 + self->n_closed, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
50 return mp_call_function_n_kw(self->fun, self->n_closed + n_args, n_kw, args2);
51 } else {
52 // use heap to allocate temporary args array
53 mp_obj_t *args2 = m_new(mp_obj_t, n_total);
54 memcpy(args2, self->closed, self->n_closed * sizeof(mp_obj_t));
55 memcpy(args2 + self->n_closed, args, (n_args + 2 * n_kw) * sizeof(mp_obj_t));
56 mp_obj_t res = mp_call_function_n_kw(self->fun, self->n_closed + n_args, n_kw, args2);
57 m_del(mp_obj_t, args2, n_total);
58 return res;
59 }
60}
61
62#if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
63STATIC void closure_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
64 (void)kind;
65 mp_obj_closure_t *o = MP_OBJ_TO_PTR(o_in);
66 mp_print_str(print, "<closure ");
67 mp_obj_print_helper(print, o->fun, PRINT_REPR);
68 mp_printf(print, " at %p, n_closed=%u ", o, (int)o->n_closed);
69 for (size_t i = 0; i < o->n_closed; i++) {
70 if (o->closed[i] == MP_OBJ_NULL) {
71 mp_print_str(print, "(nil)");
72 } else {
73 mp_obj_print_helper(print, o->closed[i], PRINT_REPR);
74 }
75 mp_print_str(print, " ");
76 }
77 mp_print_str(print, ">");
78}
79#endif
80
81const mp_obj_type_t mp_type_closure = {
82 { &mp_type_type },
83 .flags = MP_TYPE_FLAG_BINDS_SELF,
84 .name = MP_QSTR_closure,
85 #if MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_DETAILED
86 .print = closure_print,
87 #endif
88 .call = closure_call,
89};
90
91mp_obj_t mp_obj_new_closure(mp_obj_t fun, size_t n_closed_over, const mp_obj_t *closed) {
92 mp_obj_closure_t *o = m_new_obj_var(mp_obj_closure_t, mp_obj_t, n_closed_over);
93 o->base.type = &mp_type_closure;
94 o->fun = fun;
95 o->n_closed = n_closed_over;
96 memcpy(o->closed, closed, n_closed_over * sizeof(mp_obj_t));
97 return MP_OBJ_FROM_PTR(o);
98}
99