1 files changed, 21 insertions, 2 deletions
diff --git a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc
index 919ac07405..687bcb8a4d 100644
--- a/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc
+++ b/third_party/abseil-cpp/absl/container/internal/raw_hash_set.cc
@@ -23,11 +23,17 @@ namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace container_internal {
 
+alignas(16) ABSL_CONST_INIT ABSL_DLL const ctrl_t kEmptyGroup[16] = {
+    ctrl_t::kSentinel, ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty,
+    ctrl_t::kEmpty,    ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty,
+    ctrl_t::kEmpty,    ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty,
+    ctrl_t::kEmpty,    ctrl_t::kEmpty, ctrl_t::kEmpty, ctrl_t::kEmpty};
+
 constexpr size_t Group::kWidth;
 
 // Returns "random" seed.
 inline size_t RandomSeed() {
-#if ABSL_HAVE_THREAD_LOCAL
+#ifdef ABSL_HAVE_THREAD_LOCAL
   static thread_local size_t counter = 0;
   size_t value = ++counter;
 #else   // ABSL_HAVE_THREAD_LOCAL
@@ -37,12 +43,25 @@ inline size_t RandomSeed() {
   return value ^ static_cast<size_t>(reinterpret_cast<uintptr_t>(&counter));
 }
 
-bool ShouldInsertBackwards(size_t hash, ctrl_t* ctrl) {
+bool ShouldInsertBackwards(size_t hash, const ctrl_t* ctrl) {
   // To avoid problems with weak hashes and single bit tests, we use % 13.
   // TODO(kfm,sbenza): revisit after we do unconditional mixing
   return (H1(hash, ctrl) ^ RandomSeed()) % 13 > 6;
 }
 
+void ConvertDeletedToEmptyAndFullToDeleted(ctrl_t* ctrl, size_t capacity) {
+  assert(ctrl[capacity] == ctrl_t::kSentinel);
+  assert(IsValidCapacity(capacity));
+  for (ctrl_t* pos = ctrl; pos < ctrl + capacity; pos += Group::kWidth) {
+    Group{pos}.ConvertSpecialToEmptyAndFullToDeleted(pos);
+  }
+  // Copy the cloned ctrl bytes.
+  std::memcpy(ctrl + capacity + 1, ctrl, NumClonedBytes());
+  ctrl[capacity] = ctrl_t::kSentinel;
+}
+// Extern template instantiotion for inline function.
+template FindInfo find_first_non_full(const ctrl_t*, size_t, size_t);
+
 }  // namespace container_internal
 ABSL_NAMESPACE_END
 }  // namespace absl