/*
   * This file is part of the MicroPython project, http://micropython.org/
   *
   * The MIT License (MIT)
   *
   * Copyright (c) 2013-2017 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 "py/mpstate.h"
  
  #if !MICROPY_NLR_SETJMP
  // When not using setjmp, nlr_push_tail is called from inline asm so needs special care
  #if MICROPY_NLR_X86 && MICROPY_NLR_OS_WINDOWS
  // On these 32-bit platforms make sure nlr_push_tail doesn't have a leading underscore
  unsigned int nlr_push_tail(nlr_buf_t *nlr) asm("nlr_push_tail");
  #else
  // LTO can't see inside inline asm functions so explicitly mark nlr_push_tail as used
  __attribute__((used)) unsigned int nlr_push_tail(nlr_buf_t *nlr);
  #endif
  #endif
  
  unsigned int nlr_push_tail(nlr_buf_t *nlr) {
      nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
      nlr->prev = *top;
      MP_NLR_SAVE_PYSTACK(nlr);
      *top = nlr;
      return 0; // normal return
  }
  
  void nlr_pop(void) {
      nlr_buf_t **top = &MP_STATE_THREAD(nlr_top);
      *top = (*top)->prev;
  }