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stronger encoding of free lists using two keys per page

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This commit is contained in:
daan 2019-12-27 23:33:50 -08:00
parent ce02986d56
commit e3391d9a53
8 changed files with 83 additions and 50 deletions
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30
src/init.c
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@ -16,13 +16,13 @@ const mi_page_t _mi_page_empty = {
{ 0 }, false,
NULL, // free
#if MI_ENCODE_FREELIST
0,
{ 0, 0 },
#endif
0, // used
NULL,
ATOMIC_VAR_INIT(0), ATOMIC_VAR_INIT(0),
0, NULL, NULL, NULL
#if (MI_INTPTR_SIZE==8 && defined(MI_ENCODE_FREELIST)) || (MI_INTPTR_SIZE==4 && !defined(MI_ENCODE_FREELIST))
#if (MI_INTPTR_SIZE==4)
, { NULL } // padding
#endif
};
@ -83,8 +83,9 @@ const mi_heap_t _mi_heap_empty = {
MI_SMALL_PAGES_EMPTY,
MI_PAGE_QUEUES_EMPTY,
ATOMIC_VAR_INIT(NULL),
0,
0,
0, // tid
0, // cookie
{ 0, 0 }, // keys
{ {0}, {0}, 0 },
0,
false
@ -105,18 +106,21 @@ static mi_tld_t tld_main = {
{ MI_STATS_NULL } // stats
};
#if MI_INTPTR_SIZE==8
#define MI_INIT_COOKIE (0xCDCDCDCDCDCDCDCDUL)
#else
#define MI_INIT_COOKIE (0xCDCDCDCDUL)
#endif
mi_heap_t _mi_heap_main = {
&tld_main,
MI_SMALL_PAGES_EMPTY,
MI_PAGE_QUEUES_EMPTY,
NULL,
0, // thread id
#if MI_INTPTR_SIZE==8 // the cookie of the main heap can be fixed (unlike page cookies that need to be secure!)
0xCDCDCDCDCDCDCDCDUL,
#else
0xCDCDCDCDUL,
#endif
{ {0}, {0}, 0 }, // random
0, // thread id
MI_INIT_COOKIE, // initial cookie
{ MI_INIT_COOKIE, MI_INIT_COOKIE }, // the key of the main heap can be fixed (unlike page keys that need to be secure!)
{ {0}, {0}, 0 }, // random
0, // page count
false // can reclaim
};
@ -156,6 +160,8 @@ static bool _mi_heap_init(void) {
heap->thread_id = _mi_thread_id();
_mi_random_init(&heap->random);
heap->cookie = _mi_heap_random_next(heap) | 1;
heap->key[0] = _mi_heap_random_next(heap);
heap->key[1] = _mi_heap_random_next(heap);
heap->tld = tld;
memset(tld, 0, sizeof(*tld));
tld->heap_backing = heap;
@ -399,6 +405,8 @@ void mi_process_init(void) mi_attr_noexcept {
_mi_random_init(&_mi_heap_main.random);
#ifndef __APPLE__ // TODO: fix this? cannot update cookie if allocation already happened..
_mi_heap_main.cookie = _mi_heap_random_next(&_mi_heap_main);
_mi_heap_main.key[0] = _mi_heap_random_next(&_mi_heap_main);
_mi_heap_main.key[1] = _mi_heap_random_next(&_mi_heap_main);
#endif
mi_process_setup_auto_thread_done();
_mi_os_init();