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       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                 :            : 
      40                 :    8505216 : unsigned int nlr_push_tail(nlr_buf_t *nlr) {
      41                 :    8505216 :     nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
      42                 :    8323510 :     nlr->prev = *top;
      43                 :    8323510 :     MP_NLR_SAVE_PYSTACK(nlr);
      44                 :    8323510 :     *top = nlr;
      45                 :    8323510 :     return 0; // normal return
      46                 :            : }
      47                 :            : 
      48                 :    8443768 : void nlr_pop(void) {
      49                 :    8443768 :     nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
      50                 :    8480974 :     *top = (*top)->prev;
      51                 :    8480974 : }
      52                 :            : 
      53                 :            : #if MICROPY_ENABLE_VM_ABORT
      54                 :            : NORETURN void nlr_jump_abort(void) {
      55                 :            :     MP_STATE_THREAD(nlr_top) = MP_STATE_VM(nlr_abort);
      56                 :            :     nlr_jump(NULL);
      57                 :            : }
      58                 :            : #endif