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NFC: introduce SlabNext type for intra-small-slab free pointers

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Mostly cosmetic, but eliminates some void*-s and makes intention clearer.
This commit is contained in:
Nathaniel Filardo
2021-03-05 00:12:18 +00:00
committed by Matthew Parkinson
parent db0ca64ff3
commit 49fefc3f83
3 changed files with 48 additions and 29 deletions
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11
src/mem/alloc.h
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@@ -743,7 +743,7 @@ namespace snmalloc
while (pointer_align_up(bp, SLAB_SIZE) != bp)
{
Slab::alloc_new_list(bp, ffl, rsize);
void* prev = ffl.value;
SlabNext* prev = ffl.value;
while (prev != nullptr)
{
auto n = Metaslab::follow_next(prev);
@@ -1027,7 +1027,7 @@ namespace snmalloc
{
SNMALLOC_ASSUME(sizeclass < NUM_SMALL_CLASSES);
auto& fl = small_fast_free_lists[sizeclass];
void* head = fl.value;
SlabNext* head = fl.value;
if (likely(head != nullptr))
{
stats().alloc_request(size);
@@ -1148,7 +1148,8 @@ namespace snmalloc
SNMALLOC_ASSERT(ffl.value == nullptr);
Slab::alloc_new_list(bp, ffl, rsize);
void* p = remove_cache_friendly_offset(ffl.value, sizeclass);
SlabNext* p = static_cast<SlabNext*>(
remove_cache_friendly_offset(ffl.value, sizeclass));
ffl.value = Metaslab::follow_next(p);
if constexpr (zero_mem == YesZero)
@@ -1171,8 +1172,8 @@ namespace snmalloc
Slab* slab = alloc_slab<allow_reserve>(sizeclass);
if (slab == nullptr)
return nullptr;
bp =
pointer_offset(slab, get_initial_offset(sizeclass, slab->is_short()));
bp = reinterpret_cast<SlabNext*>(
pointer_offset(slab, get_initial_offset(sizeclass, slab->is_short())));
return small_alloc_build_free_list<zero_mem, allow_reserve>(sizeclass);
}