Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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