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Merge pull request #220 from cormacrelf/usable_size

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Don't call mi_page_usable_size_of with an aligned pointer
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Daan 2020-04-06 08:05:34 -07:00 • committed by GitHub
commit 1ece3ff6aa
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 8 additions and 4 deletions
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9
src/alloc.c
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@ -477,15 +477,16 @@ size_t mi_usable_size(const void* p) mi_attr_noexcept {
if (p==NULL) return 0;
const mi_segment_t* const segment = _mi_ptr_segment(p);
const mi_page_t* const page = _mi_segment_page_of(segment, p);
const mi_block_t* const block = (const mi_block_t*)p;
const size_t size = mi_page_usable_size_of(page, block);
const mi_block_t* block = (const mi_block_t*)p;
if (mi_unlikely(mi_page_has_aligned(page))) {
ptrdiff_t const adjust = (uint8_t*)p - (uint8_t*)_mi_page_ptr_unalign(segment,page,p);
block = _mi_page_ptr_unalign(segment, page, p);
size_t size = mi_page_usable_size_of(page, block);
ptrdiff_t const adjust = (uint8_t*)p - (uint8_t*)block;
mi_assert_internal(adjust >= 0 && (size_t)adjust <= size);
return (size - adjust);
}
else {
return size;
return mi_page_usable_size_of(page, block);
}
}

3
test/test-api.c
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@ -152,6 +152,9 @@ int main() {
}
result = ok;
});
CHECK_BODY("malloc-aligned5", {
void* p = mi_malloc_aligned(4097,4096); size_t usable = mi_usable_size(p); result = usable >= 4097 && usable < 10000; mi_free(p);
});
CHECK_BODY("malloc-aligned-at1", {
void* p = mi_malloc_aligned_at(48,32,0); result = (p != NULL && ((uintptr_t)(p) + 0) % 32 == 0); mi_free(p);
});