LCOV - code coverage report
Current view: top level - py - pystack.h (source / functions) Hit Total Coverage
Test: unix_coverage_v1.19.1-724-gfb7d21153.info Lines: 6 6 100.0 %
Date: 2022-12-01 09:37:31 Functions: 0 0 -
Branches: 0 0 -

           Branch data     Line data    Source code
       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                 :            : #ifndef MICROPY_INCLUDED_PY_PYSTACK_H
      27                 :            : #define MICROPY_INCLUDED_PY_PYSTACK_H
      28                 :            : 
      29                 :            : #include "py/mpstate.h"
      30                 :            : 
      31                 :            : // Enable this debugging option to check that the amount of memory freed is
      32                 :            : // consistent with amounts that were previously allocated.
      33                 :            : #define MP_PYSTACK_DEBUG (0)
      34                 :            : 
      35                 :            : #if MICROPY_ENABLE_PYSTACK
      36                 :            : 
      37                 :            : void mp_pystack_init(void *start, void *end);
      38                 :            : void *mp_pystack_alloc(size_t n_bytes);
      39                 :            : 
      40                 :            : // This function can free multiple continuous blocks at once: just pass the
      41                 :            : // pointer to the block that was allocated first and it and all subsequently
      42                 :            : // allocated blocks will be freed.
      43                 :            : static inline void mp_pystack_free(void *ptr) {
      44                 :            :     assert((uint8_t *)ptr >= MP_STATE_THREAD(pystack_start));
      45                 :            :     assert((uint8_t *)ptr <= MP_STATE_THREAD(pystack_cur));
      46                 :            :     #if MP_PYSTACK_DEBUG
      47                 :            :     size_t n_bytes_to_free = MP_STATE_THREAD(pystack_cur) - (uint8_t *)ptr;
      48                 :            :     size_t n_bytes = *(size_t *)(MP_STATE_THREAD(pystack_cur) - MICROPY_PYSTACK_ALIGN);
      49                 :            :     while (n_bytes < n_bytes_to_free) {
      50                 :            :         n_bytes += *(size_t *)(MP_STATE_THREAD(pystack_cur) - n_bytes - MICROPY_PYSTACK_ALIGN);
      51                 :            :     }
      52                 :            :     if (n_bytes != n_bytes_to_free) {
      53                 :            :         mp_printf(&mp_plat_print, "mp_pystack_free() failed: %u != %u\n", (uint)n_bytes_to_free,
      54                 :            :             (uint)*(size_t *)(MP_STATE_THREAD(pystack_cur) - MICROPY_PYSTACK_ALIGN));
      55                 :            :         assert(0);
      56                 :            :     }
      57                 :            :     #endif
      58                 :            :     MP_STATE_THREAD(pystack_cur) = (uint8_t *)ptr;
      59                 :            : }
      60                 :            : 
      61                 :            : static inline void mp_pystack_realloc(void *ptr, size_t n_bytes) {
      62                 :            :     mp_pystack_free(ptr);
      63                 :            :     mp_pystack_alloc(n_bytes);
      64                 :            : }
      65                 :            : 
      66                 :            : static inline size_t mp_pystack_usage(void) {
      67                 :            :     return MP_STATE_THREAD(pystack_cur) - MP_STATE_THREAD(pystack_start);
      68                 :            : }
      69                 :            : 
      70                 :            : static inline size_t mp_pystack_limit(void) {
      71                 :            :     return MP_STATE_THREAD(pystack_end) - MP_STATE_THREAD(pystack_start);
      72                 :            : }
      73                 :            : 
      74                 :            : #endif
      75                 :            : 
      76                 :            : #if !MICROPY_ENABLE_PYSTACK
      77                 :            : 
      78                 :            : #define mp_local_alloc(n_bytes) alloca(n_bytes)
      79                 :            : 
      80                 :            : static inline void mp_local_free(void *ptr) {
      81                 :            :     (void)ptr;
      82                 :            : }
      83                 :            : 
      84                 :       8420 : static inline void *mp_nonlocal_alloc(size_t n_bytes) {
      85                 :       8420 :     return m_new(uint8_t, n_bytes);
      86                 :            : }
      87                 :            : 
      88                 :        104 : static inline void *mp_nonlocal_realloc(void *ptr, size_t old_n_bytes, size_t new_n_bytes) {
      89                 :        104 :     return m_renew(uint8_t, ptr, old_n_bytes, new_n_bytes);
      90                 :            : }
      91                 :            : 
      92                 :       8362 : static inline void mp_nonlocal_free(void *ptr, size_t n_bytes) {
      93                 :       8362 :     m_del(uint8_t, ptr, n_bytes);
      94                 :            : }
      95                 :            : 
      96                 :            : #else
      97                 :            : 
      98                 :            : static inline void *mp_local_alloc(size_t n_bytes) {
      99                 :            :     return mp_pystack_alloc(n_bytes);
     100                 :            : }
     101                 :            : 
     102                 :            : static inline void mp_local_free(void *ptr) {
     103                 :            :     mp_pystack_free(ptr);
     104                 :            : }
     105                 :            : 
     106                 :            : static inline void *mp_nonlocal_alloc(size_t n_bytes) {
     107                 :            :     return mp_pystack_alloc(n_bytes);
     108                 :            : }
     109                 :            : 
     110                 :            : static inline void *mp_nonlocal_realloc(void *ptr, size_t old_n_bytes, size_t new_n_bytes) {
     111                 :            :     (void)old_n_bytes;
     112                 :            :     mp_pystack_realloc(ptr, new_n_bytes);
     113                 :            :     return ptr;
     114                 :            : }
     115                 :            : 
     116                 :            : static inline void mp_nonlocal_free(void *ptr, size_t n_bytes) {
     117                 :            :     (void)n_bytes;
     118                 :            :     mp_pystack_free(ptr);
     119                 :            : }
     120                 :            : 
     121                 :            : #endif
     122                 :            : 
     123                 :            : #endif // MICROPY_INCLUDED_PY_PYSTACK_H

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