pystack.c
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 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 <stdio.h>
#include "py/runtime.h"
#if MICROPY_ENABLE_PYSTACK
void mp_pystack_init(void *start, void *end) {
MP_STATE_THREAD(pystack_start) = start;
MP_STATE_THREAD(pystack_end) = end;
MP_STATE_THREAD(pystack_cur) = start;
}
void *mp_pystack_alloc(size_t n_bytes) {
n_bytes = (n_bytes + (MICROPY_PYSTACK_ALIGN - 1)) & ~(MICROPY_PYSTACK_ALIGN - 1);
#if MP_PYSTACK_DEBUG
n_bytes += MICROPY_PYSTACK_ALIGN;
#endif
if (MP_STATE_THREAD(pystack_cur) + n_bytes > MP_STATE_THREAD(pystack_end)) {
// out of memory in the pystack
nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
MP_OBJ_NEW_QSTR(MP_QSTR_pystack_space_exhausted)));
}
void *ptr = MP_STATE_THREAD(pystack_cur);
MP_STATE_THREAD(pystack_cur) += n_bytes;
#if MP_PYSTACK_DEBUG
*(size_t*)(MP_STATE_THREAD(pystack_cur) - MICROPY_PYSTACK_ALIGN) = n_bytes;
#endif
return ptr;
}
#endif