1 files changed, 30 insertions, 0 deletions
diff --git a/parser/html/nsHtml5AtomTable.cpp b/parser/html/nsHtml5AtomTable.cpp
new file mode 100644
index 0000000000..b6db184098
--- /dev/null
+++ b/parser/html/nsHtml5AtomTable.cpp
@@ -0,0 +1,30 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsHtml5AtomTable.h"
+#include "nsThreadUtils.h"
+
+nsHtml5AtomTable::nsHtml5AtomTable() : mRecentlyUsedParserAtoms{} {
+#ifdef DEBUG
+  mPermittedLookupEventTarget = mozilla::GetCurrentSerialEventTarget();
+#endif
+}
+
+nsHtml5AtomTable::~nsHtml5AtomTable() = default;
+
+nsAtom* nsHtml5AtomTable::GetAtom(const nsAString& aKey) {
+  MOZ_ASSERT(mPermittedLookupEventTarget->IsOnCurrentThread());
+  uint32_t hash = mozilla::HashString(aKey);
+  uint32_t index = hash % RECENTLY_USED_PARSER_ATOMS_SIZE;
+  if (nsAtom* atom = mRecentlyUsedParserAtoms[index]) {
+    if (atom->hash() == hash && atom->Equals(aKey)) {
+      return atom;
+    }
+  }
+
+  RefPtr<nsAtom> atom = NS_Atomize(aKey, hash);
+  nsAtom* ret = atom.get();
+  mRecentlyUsedParserAtoms[index] = std::move(atom);
+  return ret;
+}