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commit page-map within one allocation

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daanx 2024-12-25 10:50:49 -08:00
parent ce7eb4db7a
commit 15061be4b2
1 changed files with 11 additions and 8 deletions
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19
src/page-map.c
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@ -160,6 +160,7 @@ mi_decl_nodiscard mi_decl_export bool mi_is_in_heap_region(const void* p) mi_att
#else
// A 2-level page map
#define MI_PAGE_MAP_SUB_SIZE (MI_PAGE_MAP_SUB_COUNT * sizeof(mi_page_t*))
mi_decl_cache_align mi_page_t*** _mi_page_map;
static void* mi_page_map_max_address;
@ -167,6 +168,7 @@ static mi_memid_t mi_page_map_memid;
static _Atomic(mi_bfield_t) mi_page_map_commit;
static mi_page_t** mi_page_map_ensure_committed(size_t idx);
static mi_page_t** mi_page_map_ensure_at(size_t idx);
static inline void mi_page_map_set_range(mi_page_t* page, size_t idx, size_t sub_idx, size_t slice_count);
@ -200,16 +202,17 @@ bool _mi_page_map_init(void) {
}
mi_atomic_store_release(&mi_page_map_commit, (commit ? ~MI_ZU(0) : MI_ZU(0)));
// commit the first part so NULL pointers get resolved without an access violation
mi_page_map_ensure_at(0);
// note: for the NULL range we only commit one OS page
// mi_page_map_set_range(NULL, 0, 0, 1);
_mi_page_map[0] = (mi_page_t**)((uint8_t*)_mi_page_map + page_map_size);
// note: for the NULL range we only commit one OS page (in the map and sub)
if (!mi_page_map_memid.initially_committed) {
_mi_os_commit(_mi_page_map[0], os_page_size, NULL);
_mi_os_commit(&_mi_page_map[0], os_page_size, NULL); // commit first part of the map
}
_mi_page_map[0] = (mi_page_t**)((uint8_t*)_mi_page_map + page_map_size); // we reserved 2 subs at the end already
if (!mi_page_map_memid.initially_committed) {
_mi_os_commit(_mi_page_map[0], os_page_size, NULL); // only first OS page
}
if (!mi_page_map_memid.initially_zero) {
_mi_page_map[0][0] = NULL;
}
_mi_page_map[0][0] = NULL;
mi_assert_internal(_mi_ptr_page(NULL)==NULL);
return true;