calculates offset from start for small allocations
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467ba8440f
commit
577524798e
23
h_malloc.c
23
h_malloc.c
@ -1635,18 +1635,35 @@ EXPORT size_t h_malloc_object_size(void *p) {
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return 0;
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}
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thread_unseal_metadata();
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void *slab_region_start = get_slab_region_start();
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if (p >= slab_region_start && p < ro.slab_region_end) {
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struct slab_size_class_info size_class_info = slab_size_class(p);
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size_t class = size_class_info.class;
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size_t size_class = size_classes[class];
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struct size_class *c = &ro.size_class_metadata[size_class_info.arena][class];
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mutex_lock(&c->lock);
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struct slab_metadata *metadata = get_metadata(c, p);
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size_t slab_size = get_slab_size(size_class_slots[class], size_class);
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void *slab = get_slab(c, slab_size, metadata);
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size_t slot = libdivide_u32_do((const char *)p - (const char *)slab, &c->size_divisor);
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void *start = slot_pointer(size_class, slab, slot);
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size_t offset = (const char *)p - (const char *)start;
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mutex_unlock(&c->lock);
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thread_seal_metadata();
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size_t size = slab_usable_size(p);
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return size ? size - canary_size : 0;
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return size ? size - canary_size - offset : 0;
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}
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if (unlikely(slab_region_start == NULL)) {
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return SIZE_MAX;
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}
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thread_unseal_metadata();
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struct region_allocator *ra = ro.region_allocator;
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mutex_lock(&ra->lock);
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struct region_metadata *region = regions_find(p);
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