1 /*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2013-2017 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 "py/mpstate.h"
28
29 #if !MICROPY_NLR_SETJMP
30 // When not using setjmp, nlr_push_tail is called from inline asm so needs special care
31 #if MICROPY_NLR_X86 && MICROPY_NLR_OS_WINDOWS
32 // On these 32-bit platforms make sure nlr_push_tail doesn't have a leading underscore
33 unsigned int nlr_push_tail(nlr_buf_t *nlr) asm ("nlr_push_tail");
34 #else
35 // LTO can't see inside inline asm functions so explicitly mark nlr_push_tail as used
36 __attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr);
37 #endif
38 #endif
39
nlr_push_tail(nlr_buf_t * nlr)40 unsigned int nlr_push_tail(nlr_buf_t *nlr) {
41 nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
42 nlr->prev = *top;
43 MP_NLR_SAVE_PYSTACK(nlr);
44 *top = nlr;
45 return 0; // normal return
46 }
47
nlr_pop(void)48 void nlr_pop(void) {
49 nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
50 *top = (*top)->prev;
51 }
52