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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) 2014 Paul Sokolovsky
       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/runtime.h"
      28                 :            : #include "py/stackctrl.h"
      29                 :            : 
      30                 :       3224 : void mp_stack_ctrl_init(void) {
      31                 :       3224 :     volatile int stack_dummy;
      32                 :       3224 :     MP_STATE_THREAD(stack_top) = (char *)&stack_dummy;
      33                 :       3224 : }
      34                 :            : 
      35                 :        590 : void mp_stack_set_top(void *top) {
      36                 :        590 :     MP_STATE_THREAD(stack_top) = top;
      37                 :        590 : }
      38                 :            : 
      39                 :    9739666 : mp_uint_t mp_stack_usage(void) {
      40                 :            :     // Assumes descending stack
      41                 :    9739666 :     volatile int stack_dummy;
      42                 :    9739666 :     return MP_STATE_THREAD(stack_top) - (char *)&stack_dummy;
      43                 :            : }
      44                 :            : 
      45                 :            : #if MICROPY_STACK_CHECK
      46                 :            : 
      47                 :       3813 : void mp_stack_set_limit(mp_uint_t limit) {
      48                 :       3813 :     MP_STATE_THREAD(stack_limit) = limit;
      49                 :       3813 : }
      50                 :            : 
      51                 :    9642353 : void mp_stack_check(void) {
      52         [ +  + ]:    9642353 :     if (mp_stack_usage() >= MP_STATE_THREAD(stack_limit)) {
      53                 :         23 :         mp_raise_recursion_depth();
      54                 :            :     }
      55                 :    9922388 : }
      56                 :            : 
      57                 :            : #endif // MICROPY_STACK_CHECK