Source code

Revision control

Copy as Markdown

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
#ifndef mozilla_SharedStyleSheetCache_h__
#define mozilla_SharedStyleSheetCache_h__
// The shared style sheet cache is a cache that allows us to share sheets across
// documents.
// It's generally a singleton, but it is different from GlobalStyleSheetCache in
// the sense that:
// * It needs to be cycle-collectable, as it can keep alive style sheets from
// various documents.
// * It is conceptually a singleton, but given its cycle-collectable nature, we
// might re-create it.
#include "mozilla/SharedSubResourceCache.h"
#include "nsRefPtrHashtable.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/css/Loader.h"
namespace mozilla {
class StyleSheet;
class SheetLoadDataHashKey;
namespace css {
class SheetLoadData;
class Loader;
} // namespace css
struct SharedStyleSheetCacheTraits {
using Loader = css::Loader;
using Key = SheetLoadDataHashKey;
using Value = StyleSheet;
using LoadingValue = css::SheetLoadData;
static SheetLoadDataHashKey KeyFromLoadingValue(const LoadingValue& aValue) {
return SheetLoadDataHashKey(aValue);
class SharedStyleSheetCache final
: public SharedSubResourceCache<SharedStyleSheetCacheTraits,
public nsIMemoryReporter {
using Base = SharedSubResourceCache<SharedStyleSheetCacheTraits,
void Init();
// This has to be static because it's also called for loaders that don't have
// a sheet cache (loaders that are not owned by a document).
static void LoadCompleted(SharedStyleSheetCache*, css::SheetLoadData&,
using Base::LoadCompleted;
static void LoadCompletedInternal(SharedStyleSheetCache*, css::SheetLoadData&,
static void Clear(nsIPrincipal* aForPrincipal = nullptr,
const nsACString* aBaseDomain = nullptr);
void InsertIfNeeded(css::SheetLoadData&);
} // namespace mozilla