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Optimize: mark the padding bytes no access

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mark the padding bytes and mi_padding_t struct no access for all kinds of pages to improve asan accuracy(issue #1043)
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Morakito 2025-04-17 17:24:36 +08:00
parent fae61ed946
commit a81f754b1b
1 changed files with 10 additions and 0 deletions
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src/page.c
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@ -1016,6 +1016,16 @@ void* _mi_malloc_generic(mi_heap_t* heap, size_t size, bool zero, size_t huge_al
p = _mi_page_malloc_zero(heap, page, size, zero); p = _mi_page_malloc_zero(heap, page, size, zero);
mi_assert_internal(p != NULL); mi_assert_internal(p != NULL);
} }
#if MI_PADDING
mi_padding_t* const padding = (mi_padding_t*)((uint8_t*)p + mi_page_usable_block_size(page));
size_t delta = padding->delta;
uint8_t* fill = (uint8_t*)padding - delta;
const size_t maxpad = (delta > MI_MAX_ALIGN_SIZE ? MI_MAX_ALIGN_SIZE : delta);
mi_track_mem_noaccess(fill, maxpad + MI_PADDING_SIZE);
#endif
// move singleton pages to the full queue // move singleton pages to the full queue
if (page->reserved == page->used) { if (page->reserved == page->used) {
mi_page_to_full(page, mi_page_queue_of(page)); mi_page_to_full(page, mi_page_queue_of(page));