parser/html/nsHtml5AtomTable.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "nsHtml5AtomTable.h"
   6 #include "nsThreadUtils.h"
   7
   8 nsHtml5AtomTable::nsHtml5AtomTable() : mRecentlyUsedParserAtoms{} {
   9 #ifdef DEBUG
  10   mPermittedLookupEventTarget = mozilla::GetCurrentSerialEventTarget();
  11 #endif
  12 }
  13
  14 nsHtml5AtomTable::~nsHtml5AtomTable() = default;
  15
  16 nsAtom* nsHtml5AtomTable::GetAtom(const nsAString& aKey) {
  17   MOZ_ASSERT(mPermittedLookupEventTarget->IsOnCurrentThread());
  18   uint32_t hash = mozilla::HashString(aKey);
  19   uint32_t index = hash % RECENTLY_USED_PARSER_ATOMS_SIZE;
  20   if (nsAtom* atom = mRecentlyUsedParserAtoms[index]) {
  21     if (atom->hash() == hash && atom->Equals(aKey)) {
  22       return atom;
  23     }
  24   }
  25
  26   RefPtr<nsAtom> atom = NS_Atomize(aKey, hash);
  27   nsAtom* ret = atom.get();
  28   mRecentlyUsedParserAtoms[index] = std::move(atom);
  29   return ret;
  30 }