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-rw-r--r--layout/style/GlobalStyleSheetCache.h141
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diff --git a/layout/style/GlobalStyleSheetCache.h b/layout/style/GlobalStyleSheetCache.h
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+/* -*- 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/. */
+
+#ifndef mozilla_GlobalStyleSheetCache_h__
+#define mozilla_GlobalStyleSheetCache_h__
+
+#include "nsIMemoryReporter.h"
+#include "nsIObserver.h"
+#include "base/shared_memory.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/PreferenceSheet.h"
+#include "mozilla/NotNull.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/UserAgentStyleSheetID.h"
+#include "mozilla/css/Loader.h"
+
+class nsIFile;
+class nsIURI;
+
+namespace mozilla {
+class CSSStyleSheet;
+} // namespace mozilla
+
+namespace mozilla {
+namespace css {
+
+// Enum defining how error should be handled.
+enum FailureAction { eCrash = 0, eLogToConsole };
+
+} // namespace css
+
+class GlobalStyleSheetCache final : public nsIObserver,
+ public nsIMemoryReporter {
+ public:
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSIOBSERVER
+ NS_DECL_NSIMEMORYREPORTER
+
+ static GlobalStyleSheetCache* Singleton();
+
+#define STYLE_SHEET(identifier_, url_, shared_) \
+ NotNull<StyleSheet*> identifier_##Sheet();
+#include "mozilla/UserAgentStyleSheetList.h"
+#undef STYLE_SHEET
+
+ StyleSheet* GetUserContentSheet();
+ StyleSheet* GetUserChromeSheet();
+ StyleSheet* ChromePreferenceSheet();
+ StyleSheet* ContentPreferenceSheet();
+
+ static void InvalidatePreferenceSheets();
+ static bool AffectedByPref(const nsACString&);
+
+ static void Shutdown();
+
+ static void SetUserContentCSSURL(nsIURI* aURI);
+
+ size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
+
+ // Set the shared memory segment to load the shared UA sheets from.
+ // Called early on in a content process' life from
+ // ContentChild::InitSharedUASheets, before the GlobalStyleSheetCache
+ // singleton has been created.
+ static void SetSharedMemory(base::SharedMemoryHandle aHandle,
+ uintptr_t aAddress);
+
+ // Obtain a shared memory handle for the shared UA sheets to pass into a
+ // content process. Called by ContentParent::InitInternal shortly after
+ // a content process has been created.
+ base::SharedMemoryHandle CloneHandle();
+
+ // Returns the address of the shared memory segment that holds the shared UA
+ // sheets.
+ uintptr_t GetSharedMemoryAddress() {
+ return sSharedMemory ? uintptr_t(sSharedMemory->memory()) : 0;
+ }
+
+ // Size of the shared memory buffer we'll create to store the shared UA
+ // sheets. We choose a value that is big enough on both 64 bit and 32 bit.
+ //
+ // If this isn't big enough for the current contents of the shared UA
+ // sheets, we'll crash under InitSharedSheetsInParent.
+ static constexpr size_t kSharedMemorySize = 1024 * 450;
+
+ private:
+ // Shared memory header.
+ struct Header {
+ static constexpr uint32_t kMagic = 0x55415353;
+ uint32_t mMagic; // Must be set to kMagic.
+ const StyleLockedCssRules* mSheets[size_t(UserAgentStyleSheetID::Count)];
+ uint8_t mBuffer[1];
+ };
+
+ GlobalStyleSheetCache();
+ ~GlobalStyleSheetCache();
+
+ void InitFromProfile();
+ void InitSharedSheetsInParent();
+ void InitMemoryReporter();
+ RefPtr<StyleSheet> LoadSheetURL(const char* aURL,
+ css::SheetParsingMode aParsingMode,
+ css::FailureAction aFailureAction);
+ RefPtr<StyleSheet> LoadSheetFile(nsIFile* aFile,
+ css::SheetParsingMode aParsingMode);
+ RefPtr<StyleSheet> LoadSheet(nsIURI* aURI, css::SheetParsingMode aParsingMode,
+ css::FailureAction aFailureAction);
+ void LoadSheetFromSharedMemory(const char* aURL, RefPtr<StyleSheet>* aSheet,
+ css::SheetParsingMode, Header*,
+ UserAgentStyleSheetID);
+ void BuildPreferenceSheet(RefPtr<StyleSheet>* aSheet,
+ const PreferenceSheet::Prefs&);
+
+ static StaticRefPtr<GlobalStyleSheetCache> gStyleCache;
+ static StaticRefPtr<css::Loader> gCSSLoader;
+ static StaticRefPtr<nsIURI> gUserContentSheetURL;
+
+#define STYLE_SHEET(identifier_, url_, shared_) \
+ RefPtr<StyleSheet> m##identifier_##Sheet;
+#include "mozilla/UserAgentStyleSheetList.h"
+#undef STYLE_SHEET
+
+ RefPtr<StyleSheet> mChromePreferenceSheet;
+ RefPtr<StyleSheet> mContentPreferenceSheet;
+ RefPtr<StyleSheet> mUserChromeSheet;
+ RefPtr<StyleSheet> mUserContentSheet;
+
+ // Shared memory segment storing shared style sheets.
+ static StaticAutoPtr<base::SharedMemory> sSharedMemory;
+
+ // How much of the shared memory buffer we ended up using. Used for memory
+ // reporting in the parent process.
+ static size_t sUsedSharedMemory;
+};
+
+} // namespace mozilla
+
+#endif