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/*

* This file is part of the Micro Python project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2014 Fabian Vogt

*

* 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 <stdint.h>

#include <stdlib.h>

#include <string.h>

#include <sys/mman.h>

#include "py/mpstate.h"

#include "py/gc.h"

#if MICROPY_EMIT_NATIVE

#if defined(__OpenBSD__) || defined(__MACH__)

#define MAP_ANONYMOUS MAP_ANON

#endif

// The memory allocated here is not on the GC heap (and it may contain pointers

// that need to be GC'd) so we must somehow trace this memory. We do it by

// keeping a linked list of all mmap'd regions, and tracing them explicitly.

typedef struct _mmap_region_t {

void *ptr;

size_t len;

struct _mmap_region_t *next;

} mmap_region_t;

void mp_unix_alloc_exec(mp_uint_t min_size, void **ptr, mp_uint_t *size) {

// size needs to be a multiple of the page size

*size = (min_size + 0xfff) & (~0xfff);

*ptr = mmap(NULL, *size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

if (*ptr == MAP_FAILED) {

*ptr = NULL;

}

// add new link to the list of mmap'd regions

mmap_region_t *rg = m_new_obj(mmap_region_t);

rg->ptr = *ptr;

rg->len = min_size;

rg->next = MP_STATE_VM(mmap_region_head);

MP_STATE_VM(mmap_region_head) = rg;

}

void mp_unix_free_exec(void *ptr, mp_uint_t size) {

munmap(ptr, size);

// unlink the mmap'd region from the list

for (mmap_region_t **rg = (mmap_region_t**)&MP_STATE_VM(mmap_region_head); *rg != NULL; *rg = (*rg)->next) {

if ((*rg)->ptr == ptr) {

mmap_region_t *next = (*rg)->next;

m_del_obj(mmap_region_t, *rg);

*rg = next;

return;

}

}

}

void mp_unix_mark_exec(void) {

for (mmap_region_t *rg = MP_STATE_VM(mmap_region_head); rg != NULL; rg = rg->next) {

gc_collect_root(rg->ptr, rg->len / sizeof(mp_uint_t));

}

}

#endif // MICROPY_EMIT_NATIVE