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68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsHtml5AtomTable_h
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#define nsHtml5AtomTable_h
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#include "nsHashKeys.h"
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#include "nsTHashtable.h"
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#include "nsAtom.h"
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#include "nsISerialEventTarget.h"
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#define RECENTLY_USED_PARSER_ATOMS_SIZE 37
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/*
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* nsHtml5AtomTable provides an atom cache for nsHtml5Parser and
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* nsHtml5StreamParser.
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*
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* An instance of nsHtml5AtomTable that belongs to an nsHtml5Parser is only
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* accessed from the main thread. An instance of nsHtml5AtomTable that belongs
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* to an nsHtml5StreamParser is accessed both from the main thread and from the
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* thread that executes the runnables of the nsHtml5StreamParser instance.
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* However, the threads never access the nsHtml5AtomTable instance concurrently
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* in the nsHtml5StreamParser case.
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*
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* Methods on the atoms obtained from nsHtml5AtomTable may be called on any
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* thread, although they only need to be called on the main thread or on the
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* thread working for the nsHtml5StreamParser when nsHtml5AtomTable belongs to
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* an nsHtml5StreamParser.
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*
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* Atoms cached by nsHtml5AtomTable are released when Clear() is called or when
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* the nsHtml5AtomTable itself is destructed, which happens when the owner
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* nsHtml5Parser or nsHtml5StreamParser is destructed.
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*/
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class nsHtml5AtomTable {
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public:
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nsHtml5AtomTable();
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~nsHtml5AtomTable();
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// NOTE: We rely on mRecentlyUsedParserAtoms keeping alive the returned atom,
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// but the caller is responsible to take a reference before calling GetAtom
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// again.
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nsAtom* GetAtom(const nsAString& aKey);
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/**
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* Empties the table.
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*/
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void Clear() {
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for (uint32_t i = 0; i < RECENTLY_USED_PARSER_ATOMS_SIZE; ++i) {
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mRecentlyUsedParserAtoms[i] = nullptr;
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}
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}
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#ifdef DEBUG
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void SetPermittedLookupEventTarget(nsISerialEventTarget* aEventTarget) {
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mPermittedLookupEventTarget = aEventTarget;
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}
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#endif
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private:
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RefPtr<nsAtom> mRecentlyUsedParserAtoms[RECENTLY_USED_PARSER_ATOMS_SIZE];
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#ifdef DEBUG
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nsCOMPtr<nsISerialEventTarget> mPermittedLookupEventTarget;
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#endif
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};
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#endif // nsHtml5AtomTable_h
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