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fix full SEGMENT_SIZE internal alignment by adding one more slice entry

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daan 2022-11-06 20:36:51 -08:00
parent 4814a649be
commit 562efed54d
4 changed files with 14 additions and 10 deletions
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6
include/mimalloc-internal.h
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@ -481,11 +481,11 @@ static inline mi_slice_t* mi_slice_first(const mi_slice_t* slice) {
// Get the page containing the pointer
static inline mi_page_t* _mi_segment_page_of(const mi_segment_t* segment, const void* p) {
mi_assert_internal(p > segment);
ptrdiff_t diff = (uint8_t*)p - (uint8_t*)segment;
mi_assert_internal(diff >= 0 && diff <= (ptrdiff_t)MI_SEGMENT_SIZE /* can be equal for large alignment */);
if (diff == MI_SEGMENT_SIZE) diff--;
mi_assert_internal(diff > 0 && diff <= (ptrdiff_t)MI_SEGMENT_SIZE);
size_t idx = (size_t)diff >> MI_SEGMENT_SLICE_SHIFT;
mi_assert_internal(idx < segment->slice_entries);
mi_assert_internal(idx <= segment->slice_entries);
mi_slice_t* slice0 = (mi_slice_t*)&segment->slices[idx];
mi_slice_t* slice = mi_slice_first(slice0); // adjust to the block that holds the page data
mi_assert_internal(slice->slice_offset == 0);