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Diffstat (limited to 'layout/style/SharedStyleSheetCache.cpp')
| -rw-r--r-- | layout/style/SharedStyleSheetCache.cpp | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/layout/style/SharedStyleSheetCache.cpp b/layout/style/SharedStyleSheetCache.cpp new file mode 100644 index 0000000000..b0ec65522d --- /dev/null +++ b/layout/style/SharedStyleSheetCache.cpp @@ -0,0 +1,223 @@ +/* -*- 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 http://mozilla.org/MPL/2.0/. */ + +#include "SharedStyleSheetCache.h" + +#include "mozilla/MemoryReporting.h" +#include "mozilla/StoragePrincipalHelper.h" +#include "mozilla/StyleSheet.h" +#include "mozilla/css/SheetLoadData.h" +#include "mozilla/dom/ContentParent.h" +#include "mozilla/dom/Document.h" +#include "mozilla/ServoBindings.h" +#include "nsContentUtils.h" +#include "nsXULPrototypeCache.h" + +extern mozilla::LazyLogModule sCssLoaderLog; + +#define LOG(...) MOZ_LOG(sCssLoaderLog, mozilla::LogLevel::Debug, (__VA_ARGS__)) + +namespace mozilla { + +NS_IMPL_ISUPPORTS(SharedStyleSheetCache, nsIMemoryReporter) + +MOZ_DEFINE_MALLOC_SIZE_OF(SharedStyleSheetCacheMallocSizeOf) + +SharedStyleSheetCache::SharedStyleSheetCache() = default; + +void SharedStyleSheetCache::Init() { RegisterWeakMemoryReporter(this); } + +SharedStyleSheetCache::~SharedStyleSheetCache() { + UnregisterWeakMemoryReporter(this); +} + +void SharedStyleSheetCache::LoadCompleted(SharedStyleSheetCache* aCache, + StyleSheetLoadData& aData, + nsresult aStatus) { + // If aStatus is a failure we need to mark this data failed. We also need to + // mark any ancestors of a failing data as failed and any sibling of a + // failing data as failed. Note that SheetComplete is never called on a + // SheetLoadData that is the mNext of some other SheetLoadData. + nsresult cancelledStatus = aStatus; + if (NS_FAILED(aStatus)) { + css::Loader::MarkLoadTreeFailed(aData); + } else { + cancelledStatus = NS_BINDING_ABORTED; + css::SheetLoadData* data = &aData; + do { + if (data->IsCancelled()) { + // We only need to mark loads for this loader as cancelled, so as to not + // fire error events in unrelated documents. + css::Loader::MarkLoadTreeFailed(*data, data->mLoader); + } + } while ((data = data->mNext)); + } + + // 8 is probably big enough for all our common cases. It's not likely that + // imports will nest more than 8 deep, and multiple sheets with the same URI + // are rare. + AutoTArray<RefPtr<css::SheetLoadData>, 8> datasToNotify; + LoadCompletedInternal(aCache, aData, datasToNotify); + + // Now it's safe to go ahead and notify observers + for (RefPtr<css::SheetLoadData>& data : datasToNotify) { + auto status = data->IsCancelled() ? cancelledStatus : aStatus; + data->mLoader->NotifyObservers(*data, status); + } +} + +void SharedStyleSheetCache::InsertIfNeeded(css::SheetLoadData& aData) { + MOZ_ASSERT(aData.mLoader->IsDocumentAssociated(), + "We only cache document-associated sheets"); + LOG("SharedStyleSheetCache::InsertIfNeeded"); + // If we ever start doing this for failed loads, we'll need to adjust the + // PostLoadEvent code that thinks anything already complete must have loaded + // succesfully. + if (aData.mLoadFailed) { + LOG(" Load failed, bailing"); + return; + } + + // If this sheet came from the cache already, there's no need to override + // anything. + if (aData.mSheetAlreadyComplete) { + LOG(" Sheet came from the cache, bailing"); + return; + } + + if (!aData.mURI) { + LOG(" Inline or constructable style sheet, bailing"); + // Inline sheet caching happens in Loader::mInlineSheets. + // Constructable sheets are not worth caching, they're always unique. + return; + } + + LOG(" Putting style sheet in shared cache: %s", + aData.mURI->GetSpecOrDefault().get()); + Insert(aData); +} + +void SharedStyleSheetCache::LoadCompletedInternal( + SharedStyleSheetCache* aCache, css::SheetLoadData& aData, + nsTArray<RefPtr<css::SheetLoadData>>& aDatasToNotify) { + if (aCache) { + aCache->LoadCompleted(aData); + } + + // Go through and deal with the whole linked list. + auto* data = &aData; + do { + MOZ_RELEASE_ASSERT(!data->mSheetCompleteCalled); + data->mSheetCompleteCalled = true; + + if (!data->mSheetAlreadyComplete) { + // If mSheetAlreadyComplete, then the sheet could well be modified between + // when we posted the async call to SheetComplete and now, since the sheet + // was page-accessible during that whole time. + + // HasForcedUniqueInner() is okay if the sheet is constructed, because + // constructed sheets are always unique and they may be set to complete + // multiple times if their rules are replaced via Replace() + MOZ_ASSERT(data->mSheet->IsConstructed() || + !data->mSheet->HasForcedUniqueInner(), + "should not get a forced unique inner during parsing"); + // Insert the sheet into the tree now the sheet has loaded, but only if + // the sheet is still relevant, and if this is a top-level sheet. + const bool needInsertIntoTree = [&] { + if (!data->mLoader->GetDocument()) { + // Not a document load, nothing to do. + return false; + } + if (data->IsPreload()) { + // Preloads are not supposed to be observable. + return false; + } + if (data->mSheet->IsConstructed()) { + // Constructable sheets are not in the regular stylesheet tree. + return false; + } + if (data->mIsChildSheet) { + // A child sheet, those will get exposed from the parent, no need to + // insert them into the tree. + return false; + } + if (data->mOwningNodeBeforeLoadEvent != data->mSheet->GetOwnerNode()) { + // The sheet was already removed from the tree and is no longer the + // current sheet of the owning node, we can bail. + return false; + } + return true; + }(); + + if (needInsertIntoTree) { + data->mLoader->InsertSheetInTree(*data->mSheet); + } + data->mSheet->SetComplete(); + data->ScheduleLoadEventIfNeeded(); + } else if (data->mSheet->IsApplicable()) { + if (dom::Document* doc = data->mLoader->GetDocument()) { + // We post these events for devtools, even though the applicable state + // has not actually changed, to make the cache not observable. + doc->PostStyleSheetApplicableStateChangeEvent(*data->mSheet); + } + } + + aDatasToNotify.AppendElement(data); + + NS_ASSERTION(!data->mParentData || data->mParentData->mPendingChildren != 0, + "Broken pending child count on our parent"); + + // If we have a parent, our parent is no longer being parsed, and + // we are the last pending child, then our load completion + // completes the parent too. Note that the parent _can_ still be + // being parsed (eg if the child (us) failed to open the channel + // or some such). + if (data->mParentData && --(data->mParentData->mPendingChildren) == 0 && + !data->mParentData->mIsBeingParsed) { + LoadCompletedInternal(aCache, *data->mParentData, aDatasToNotify); + } + + data = data->mNext; + } while (data); + + if (aCache) { + aCache->InsertIfNeeded(aData); + } +} + +NS_IMETHODIMP +SharedStyleSheetCache::CollectReports(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, bool aAnonymize) { + MOZ_COLLECT_REPORT("explicit/layout/style-sheet-cache/document-shared", + KIND_HEAP, UNITS_BYTES, + SizeOfIncludingThis(SharedStyleSheetCacheMallocSizeOf), + "Memory used for SharedStyleSheetCache to share style " + "sheets across documents (not to be confused with " + "GlobalStyleSheetCache)"); + return NS_OK; +} + +void SharedStyleSheetCache::Clear(nsIPrincipal* aForPrincipal, + const nsACString* aBaseDomain) { + using ContentParent = dom::ContentParent; + + if (XRE_IsParentProcess()) { + auto forPrincipal = aForPrincipal ? Some(RefPtr(aForPrincipal)) : Nothing(); + auto baseDomain = aBaseDomain ? Some(nsCString(*aBaseDomain)) : Nothing(); + + for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) { + Unused << cp->SendClearStyleSheetCache(forPrincipal, baseDomain); + } + } + + if (sInstance) { + sInstance->ClearInProcess(aForPrincipal, aBaseDomain); + } +} + +} // namespace mozilla + +#undef LOG |