124 lines
4.0 KiB
C
124 lines
4.0 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_PY_PYSTACK_H
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#define MICROPY_INCLUDED_PY_PYSTACK_H
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#include "py/mpstate.h"
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// Enable this debugging option to check that the amount of memory freed is
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// consistent with amounts that were previously allocated.
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#define MP_PYSTACK_DEBUG (0)
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#if MICROPY_ENABLE_PYSTACK
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void mp_pystack_init(void *start, void *end);
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void *mp_pystack_alloc(size_t n_bytes);
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// This function can free multiple continuous blocks at once: just pass the
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// pointer to the block that was allocated first and it and all subsequently
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// allocated blocks will be freed.
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static inline void mp_pystack_free(void *ptr) {
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assert((uint8_t*)ptr >= MP_STATE_THREAD(pystack_start));
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assert((uint8_t*)ptr <= MP_STATE_THREAD(pystack_cur));
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#if MP_PYSTACK_DEBUG
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size_t n_bytes_to_free = MP_STATE_THREAD(pystack_cur) - (uint8_t*)ptr;
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size_t n_bytes = *(size_t*)(MP_STATE_THREAD(pystack_cur) - MICROPY_PYSTACK_ALIGN);
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while (n_bytes < n_bytes_to_free) {
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n_bytes += *(size_t*)(MP_STATE_THREAD(pystack_cur) - n_bytes - MICROPY_PYSTACK_ALIGN);
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}
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if (n_bytes != n_bytes_to_free) {
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mp_printf(&mp_plat_print, "mp_pystack_free() failed: %u != %u\n", (uint)n_bytes_to_free,
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(uint)*(size_t*)(MP_STATE_THREAD(pystack_cur) - MICROPY_PYSTACK_ALIGN));
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assert(0);
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}
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#endif
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MP_STATE_THREAD(pystack_cur) = (uint8_t*)ptr;
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}
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static inline void mp_pystack_realloc(void *ptr, size_t n_bytes) {
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mp_pystack_free(ptr);
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mp_pystack_alloc(n_bytes);
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}
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static inline size_t mp_pystack_usage(void) {
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return MP_STATE_THREAD(pystack_cur) - MP_STATE_THREAD(pystack_start);
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}
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static inline size_t mp_pystack_limit(void) {
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return MP_STATE_THREAD(pystack_end) - MP_STATE_THREAD(pystack_start);
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}
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#endif
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#if !MICROPY_ENABLE_PYSTACK
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#define mp_local_alloc(n_bytes) alloca(n_bytes)
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static inline void mp_local_free(void *ptr) {
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(void)ptr;
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}
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static inline void *mp_nonlocal_alloc(size_t n_bytes) {
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return m_new(uint8_t, n_bytes);
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}
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static inline void *mp_nonlocal_realloc(void *ptr, size_t old_n_bytes, size_t new_n_bytes) {
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return m_renew(uint8_t, ptr, old_n_bytes, new_n_bytes);
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}
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static inline void mp_nonlocal_free(void *ptr, size_t n_bytes) {
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m_del(uint8_t, ptr, n_bytes);
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}
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#else
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static inline void *mp_local_alloc(size_t n_bytes) {
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return mp_pystack_alloc(n_bytes);
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}
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static inline void mp_local_free(void *ptr) {
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mp_pystack_free(ptr);
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}
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static inline void *mp_nonlocal_alloc(size_t n_bytes) {
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return mp_pystack_alloc(n_bytes);
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}
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static inline void *mp_nonlocal_realloc(void *ptr, size_t old_n_bytes, size_t new_n_bytes) {
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(void)old_n_bytes;
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mp_pystack_realloc(ptr, new_n_bytes);
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return ptr;
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}
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static inline void mp_nonlocal_free(void *ptr, size_t n_bytes) {
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(void)n_bytes;
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mp_pystack_free(ptr);
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}
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#endif
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#endif // MICROPY_INCLUDED_PY_PYSTACK_H
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