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2127e9a844
Native code has GC-heap pointers in it so it must be scanned. But on unix port memory for native functions is mmap'd, and so it must have explicit code to scan it for root pointers.
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/*
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* This file is part of the Micro Python 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) 2014 Fabian Vogt
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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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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include "py/mpstate.h"
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#include "py/gc.h"
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#if defined(__OpenBSD__) || defined(__MACH__)
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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// The memory allocated here is not on the GC heap (and it may contain pointers
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// that need to be GC'd) so we must somehow trace this memory. We do it by
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// keeping a linked list of all mmap'd regions, and tracing them explicitly.
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typedef struct _mmap_region_t {
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void *ptr;
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size_t len;
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struct _mmap_region_t *next;
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} mmap_region_t;
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void mp_unix_alloc_exec(mp_uint_t min_size, void **ptr, mp_uint_t *size) {
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// size needs to be a multiple of the page size
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*size = (min_size + 0xfff) & (~0xfff);
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*ptr = mmap(NULL, *size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (*ptr == MAP_FAILED) {
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*ptr = NULL;
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}
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// add new link to the list of mmap'd regions
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mmap_region_t *rg = m_new_obj(mmap_region_t);
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rg->ptr = *ptr;
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rg->len = min_size;
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rg->next = MP_STATE_VM(mmap_region_head);
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MP_STATE_VM(mmap_region_head) = rg;
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}
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void mp_unix_free_exec(void *ptr, mp_uint_t size) {
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munmap(ptr, size);
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// unlink the mmap'd region from the list
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for (mmap_region_t **rg = (mmap_region_t**)&MP_STATE_VM(mmap_region_head); *rg != NULL; *rg = (*rg)->next) {
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if ((*rg)->ptr == ptr) {
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mmap_region_t *next = (*rg)->next;
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m_del_obj(mmap_region_t, *rg);
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*rg = next;
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return;
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}
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}
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}
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void mp_unix_mark_exec(void) {
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for (mmap_region_t *rg = MP_STATE_VM(mmap_region_head); rg != NULL; rg = rg->next) {
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gc_collect_root(rg->ptr, rg->len / sizeof(mp_uint_t));
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}
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}
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