1/*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2017 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 <stdio.h>
28
29#include "py/runtime.h"
30
31#if MICROPY_ENABLE_PYSTACK
32
33void mp_pystack_init(void *start, void *end) {
34 MP_STATE_THREAD(pystack_start) = start;
35 MP_STATE_THREAD(pystack_end) = end;
36 MP_STATE_THREAD(pystack_cur) = start;
37}
38
39void *mp_pystack_alloc(size_t n_bytes) {
40 n_bytes = (n_bytes + (MICROPY_PYSTACK_ALIGN - 1)) & ~(MICROPY_PYSTACK_ALIGN - 1);
41 #if MP_PYSTACK_DEBUG
42 n_bytes += MICROPY_PYSTACK_ALIGN;
43 #endif
44 if (MP_STATE_THREAD(pystack_cur) + n_bytes > MP_STATE_THREAD(pystack_end)) {
45 // out of memory in the pystack
46 nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
47 MP_OBJ_NEW_QSTR(MP_QSTR_pystack_space_exhausted)));
48 }
49 void *ptr = MP_STATE_THREAD(pystack_cur);
50 MP_STATE_THREAD(pystack_cur) += n_bytes;
51 #if MP_PYSTACK_DEBUG
52 *(size_t *)(MP_STATE_THREAD(pystack_cur) - MICROPY_PYSTACK_ALIGN) = n_bytes;
53 #endif
54 return ptr;
55}
56
57#endif
58