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-rw-r--r--absl/container/internal/raw_hash_set.h108
1 files changed, 46 insertions, 62 deletions
diff --git a/absl/container/internal/raw_hash_set.h b/absl/container/internal/raw_hash_set.h
index 5a514d7b..2880af70 100644
--- a/absl/container/internal/raw_hash_set.h
+++ b/absl/container/internal/raw_hash_set.h
@@ -889,11 +889,6 @@ using CommonFieldsGenerationInfo = CommonFieldsGenerationInfoDisabled;
using HashSetIteratorGenerationInfo = HashSetIteratorGenerationInfoDisabled;
#endif
-// Returns whether `n` is a valid capacity (i.e., number of slots).
-//
-// A valid capacity is a non-zero integer `2^m - 1`.
-inline bool IsValidCapacity(size_t n) { return ((n + 1) & n) == 0 && n > 0; }
-
// CommonFields hold the fields in raw_hash_set that do not depend
// on template parameters. This allows us to conveniently pass all
// of this state to helper functions as a single argument.
@@ -911,34 +906,21 @@ class CommonFields : public CommonFieldsGenerationInfo {
std::move(static_cast<CommonFieldsGenerationInfo&&>(that))),
// Explicitly copying fields into "this" and then resetting "that"
// fields generates less code then calling absl::exchange per field.
- control_(that.control()),
- slots_(that.slots()),
- size_(that.size()),
- capacity_(that.capacity()),
+ control_(that.control_),
+ slots_(that.slots_),
+ size_(that.size_),
+ capacity_(that.capacity_),
compressed_tuple_(that.growth_left(), std::move(that.infoz())) {
- that.set_control(EmptyGroup());
- that.set_slots(nullptr);
- that.set_size(0);
- that.set_capacity(0);
- that.set_growth_left(0);
+ that.control_ = EmptyGroup();
+ that.slots_ = nullptr;
+ that.size_ = 0;
+ that.capacity_ = 0;
+ that.growth_left() = 0;
}
CommonFields& operator=(CommonFields&&) = default;
- ctrl_t* control() const { return control_; }
- void set_control(ctrl_t* c) { control_ = c; }
- void* slots() const { return slots_; }
- void set_slots(void* s) { slots_ = s; }
- size_t size() const { return size_; }
- void set_size(size_t s) { size_ = s; }
- size_t capacity() const { return capacity_; }
- void set_capacity(size_t c) {
- assert(c == 0 || IsValidCapacity(c));
- capacity_ = c;
- }
-
// The number of slots we can still fill without needing to rehash.
- size_t growth_left() const { return compressed_tuple_.template get<0>(); }
- void set_growth_left(size_t gl) { compressed_tuple_.template get<0>() = gl; }
+ size_t& growth_left() { return compressed_tuple_.template get<0>(); }
HashtablezInfoHandle& infoz() { return compressed_tuple_.template get<1>(); }
const HashtablezInfoHandle& infoz() const {
@@ -947,17 +929,15 @@ class CommonFields : public CommonFieldsGenerationInfo {
bool should_rehash_for_bug_detection_on_insert() const {
return CommonFieldsGenerationInfo::
- should_rehash_for_bug_detection_on_insert(control(), capacity());
+ should_rehash_for_bug_detection_on_insert(control_, capacity_);
}
void reset_reserved_growth(size_t reservation) {
CommonFieldsGenerationInfo::reset_reserved_growth(reservation, size_);
}
- private:
// TODO(b/259599413): Investigate removing some of these fields:
// - control/slots can be derived from each other
- // - growth_left can be moved into the slot array
- // - we can use 6 bits for capacity since it's always a power of two minus 1
+ // - size can be moved into the slot array
// The control bytes (and, also, a pointer to the base of the backing array).
//
@@ -991,6 +971,11 @@ constexpr size_t NumClonedBytes() { return Group::kWidth - 1; }
template <class Policy, class Hash, class Eq, class Alloc>
class raw_hash_set;
+// Returns whether `n` is a valid capacity (i.e., number of slots).
+//
+// A valid capacity is a non-zero integer `2^m - 1`.
+inline bool IsValidCapacity(size_t n) { return ((n + 1) & n) == 0 && n > 0; }
+
// Returns the next valid capacity after `n`.
inline size_t NextCapacity(size_t n) {
assert(IsValidCapacity(n) || n == 0);
@@ -1231,7 +1216,7 @@ inline probe_seq<Group::kWidth> probe(const ctrl_t* ctrl, const size_t capacity,
return probe_seq<Group::kWidth>(H1(hash, ctrl), capacity);
}
inline probe_seq<Group::kWidth> probe(const CommonFields& common, size_t hash) {
- return probe(common.control(), common.capacity(), hash);
+ return probe(common.control_, common.capacity_, hash);
}
// Probes an array of control bits using a probe sequence derived from `hash`,
@@ -1244,7 +1229,7 @@ inline probe_seq<Group::kWidth> probe(const CommonFields& common, size_t hash) {
template <typename = void>
inline FindInfo find_first_non_full(const CommonFields& common, size_t hash) {
auto seq = probe(common, hash);
- const ctrl_t* ctrl = common.control();
+ const ctrl_t* ctrl = common.control_;
while (true) {
Group g{ctrl + seq.offset()};
auto mask = g.MaskEmptyOrDeleted();
@@ -1254,14 +1239,14 @@ inline FindInfo find_first_non_full(const CommonFields& common, size_t hash) {
// In debug build we will randomly insert in either the front or back of
// the group.
// TODO(kfm,sbenza): revisit after we do unconditional mixing
- if (!is_small(common.capacity()) && ShouldInsertBackwards(hash, ctrl)) {
+ if (!is_small(common.capacity_) && ShouldInsertBackwards(hash, ctrl)) {
return {seq.offset(mask.HighestBitSet()), seq.index()};
}
#endif
return {seq.offset(mask.LowestBitSet()), seq.index()};
}
seq.next();
- assert(seq.index() <= common.capacity() && "full table!");
+ assert(seq.index() <= common.capacity_ && "full table!");
}
}
@@ -1275,18 +1260,18 @@ extern template FindInfo find_first_non_full(const CommonFields&, size_t);
FindInfo find_first_non_full_outofline(const CommonFields&, size_t);
inline void ResetGrowthLeft(CommonFields& common) {
- common.set_growth_left(CapacityToGrowth(common.capacity()) - common.size());
+ common.growth_left() = CapacityToGrowth(common.capacity_) - common.size_;
}
// Sets `ctrl` to `{kEmpty, kSentinel, ..., kEmpty}`, marking the entire
// array as marked as empty.
inline void ResetCtrl(CommonFields& common, size_t slot_size) {
- const size_t capacity = common.capacity();
- ctrl_t* ctrl = common.control();
+ const size_t capacity = common.capacity_;
+ ctrl_t* ctrl = common.control_;
std::memset(ctrl, static_cast<int8_t>(ctrl_t::kEmpty),
capacity + 1 + NumClonedBytes());
ctrl[capacity] = ctrl_t::kSentinel;
- SanitizerPoisonMemoryRegion(common.slots(), slot_size * capacity);
+ SanitizerPoisonMemoryRegion(common.slots_, slot_size * capacity);
ResetGrowthLeft(common);
}
@@ -1296,17 +1281,17 @@ inline void ResetCtrl(CommonFields& common, size_t slot_size) {
// mirror the value to the cloned tail if necessary.
inline void SetCtrl(const CommonFields& common, size_t i, ctrl_t h,
size_t slot_size) {
- const size_t capacity = common.capacity();
+ const size_t capacity = common.capacity_;
assert(i < capacity);
- auto* slot_i = static_cast<const char*>(common.slots()) + i * slot_size;
+ auto* slot_i = static_cast<const char*>(common.slots_) + i * slot_size;
if (IsFull(h)) {
SanitizerUnpoisonMemoryRegion(slot_i, slot_size);
} else {
SanitizerPoisonMemoryRegion(slot_i, slot_size);
}
- ctrl_t* ctrl = common.control();
+ ctrl_t* ctrl = common.control_;
ctrl[i] = h;
ctrl[((i - NumClonedBytes()) & capacity) + (NumClonedBytes() & capacity)] = h;
}
@@ -1342,31 +1327,31 @@ inline size_t AllocSize(size_t capacity, size_t slot_size, size_t slot_align) {
template <typename Alloc, size_t SizeOfSlot, size_t AlignOfSlot>
ABSL_ATTRIBUTE_NOINLINE void InitializeSlots(CommonFields& c, Alloc alloc) {
- assert(c.capacity());
+ assert(c.capacity_);
// Folks with custom allocators often make unwarranted assumptions about the
// behavior of their classes vis-a-vis trivial destructability and what
// calls they will or won't make. Avoid sampling for people with custom
// allocators to get us out of this mess. This is not a hard guarantee but
// a workaround while we plan the exact guarantee we want to provide.
const size_t sample_size =
- (std::is_same<Alloc, std::allocator<char>>::value && c.slots() == nullptr)
+ (std::is_same<Alloc, std::allocator<char>>::value && c.slots_ == nullptr)
? SizeOfSlot
: 0;
- const size_t cap = c.capacity();
+ const size_t cap = c.capacity_;
char* mem = static_cast<char*>(
Allocate<AlignOfSlot>(&alloc, AllocSize(cap, SizeOfSlot, AlignOfSlot)));
const GenerationType old_generation = c.generation();
c.set_generation_ptr(
reinterpret_cast<GenerationType*>(mem + GenerationOffset(cap)));
c.set_generation(NextGeneration(old_generation));
- c.set_control(reinterpret_cast<ctrl_t*>(mem));
- c.set_slots(mem + SlotOffset(cap, AlignOfSlot));
+ c.control_ = reinterpret_cast<ctrl_t*>(mem);
+ c.slots_ = mem + SlotOffset(cap, AlignOfSlot);
ResetCtrl(c, SizeOfSlot);
if (sample_size) {
c.infoz() = Sample(sample_size);
}
- c.infoz().RecordStorageChanged(c.size(), cap);
+ c.infoz().RecordStorageChanged(c.size_, cap);
}
// PolicyFunctions bundles together some information for a particular
@@ -1669,7 +1654,7 @@ class raw_hash_set {
const allocator_type& alloc = allocator_type())
: settings_(CommonFields{}, hash, eq, alloc) {
if (bucket_count) {
- common().set_capacity(NormalizeCapacity(bucket_count));
+ common().capacity_ = NormalizeCapacity(bucket_count);
initialize_slots();
}
}
@@ -1782,8 +1767,8 @@ class raw_hash_set {
common().maybe_increment_generation_on_insert();
infoz().RecordInsert(hash, target.probe_length);
}
- common().set_size(that.size());
- set_growth_left(growth_left() - that.size());
+ common().size_ = that.size();
+ growth_left() -= that.size();
}
ABSL_ATTRIBUTE_NOINLINE raw_hash_set(raw_hash_set&& that) noexcept(
@@ -1864,8 +1849,8 @@ class raw_hash_set {
const_iterator cend() const ABSL_ATTRIBUTE_LIFETIME_BOUND { return end(); }
bool empty() const { return !size(); }
- size_t size() const { return common().size(); }
- size_t capacity() const { return common().capacity(); }
+ size_t size() const { return common().size_; }
+ size_t capacity() const { return common().capacity_; }
size_t max_size() const { return (std::numeric_limits<size_t>::max)(); }
ABSL_ATTRIBUTE_REINITIALIZES void clear() {
@@ -2447,8 +2432,8 @@ class raw_hash_set {
assert(IsValidCapacity(new_capacity));
auto* old_ctrl = control();
auto* old_slots = slot_array();
- const size_t old_capacity = common().capacity();
- common().set_capacity(new_capacity);
+ const size_t old_capacity = common().capacity_;
+ common().capacity_ = new_capacity;
initialize_slots();
auto* new_slots = slot_array();
@@ -2615,8 +2600,8 @@ class raw_hash_set {
rehash_and_grow_if_necessary();
target = find_first_non_full(common(), hash);
}
- common().set_size(common().size() + 1);
- set_growth_left(growth_left() - IsEmpty(control()[target.offset]));
+ ++common().size_;
+ growth_left() -= IsEmpty(control()[target.offset]);
SetCtrl(common(), target.offset, H2(hash), sizeof(slot_type));
common().maybe_increment_generation_on_insert();
infoz().RecordInsert(hash, target.probe_length);
@@ -2661,8 +2646,7 @@ class raw_hash_set {
// side-effect.
//
// See `CapacityToGrowth()`.
- size_t growth_left() const { return common().growth_left(); }
- void set_growth_left(size_t gl) { return common().set_growth_left(gl); }
+ size_t& growth_left() { return common().growth_left(); }
// Prefetch the heap-allocated memory region to resolve potential TLB and
// cache misses. This is intended to overlap with execution of calculating the
@@ -2676,9 +2660,9 @@ class raw_hash_set {
CommonFields& common() { return settings_.template get<0>(); }
const CommonFields& common() const { return settings_.template get<0>(); }
- ctrl_t* control() const { return common().control(); }
+ ctrl_t* control() const { return common().control_; }
slot_type* slot_array() const {
- return static_cast<slot_type*>(common().slots());
+ return static_cast<slot_type*>(common().slots_);
}
HashtablezInfoHandle& infoz() { return common().infoz(); }
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-11 21:54:47 +0000