7c0d4089c5
In bug 1967507 I changed the timing of AnonymousContent stylesheet loading in a way that it perturbed a css cache test because of accessiblecaret.css https://hg.mozilla.org/mozilla-central/rev/a6a294ae1d18 However that made me realize that accessiblecaret.css is loaded virtually in all processes, and it should be using the same mechanism we use for UA sheets, rather than using all the CSS loader machinery in-content. Same goes for details.css. Expand GlobalStyleSheetCache to allow UA and Author sheets, and allow ShadowRoot to get built-in stylesheets appended. This allows accessiblecaret.css and details.css not to be marked as content-accessible. We could do the same at the document level for plaintext.css and co, but that seems a bit less common, so maybe fine. Differential Revision: https://phabricator.services.mozilla.com/D250909
138 lines
4.7 KiB
C++
138 lines
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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 mozilla_GlobalStyleSheetCache_h__
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#define mozilla_GlobalStyleSheetCache_h__
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#include "nsIMemoryReporter.h"
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#include "nsIObserver.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/BuiltInStyleSheets.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/PreferenceSheet.h"
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#include "mozilla/NotNull.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/css/Loader.h"
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#include "mozilla/ipc/SharedMemoryHandle.h"
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#include "mozilla/ipc/SharedMemoryMapping.h"
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class nsIFile;
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class nsIURI;
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namespace mozilla {
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class CSSStyleSheet;
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} // namespace mozilla
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namespace mozilla {
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namespace css {
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// Enum defining how error should be handled.
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enum FailureAction { eCrash = 0, eLogToConsole };
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} // namespace css
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class GlobalStyleSheetCache final : public nsIObserver,
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public nsIMemoryReporter {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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NS_DECL_NSIMEMORYREPORTER
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static GlobalStyleSheetCache* Singleton();
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#define STYLE_SHEET(identifier_, url_, flags_) \
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NotNull<StyleSheet*> identifier_##Sheet() { \
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return BuiltInSheet(BuiltInStyleSheet::identifier_); \
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}
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#include "mozilla/BuiltInStyleSheetList.h"
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#undef STYLE_SHEET
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NotNull<StyleSheet*> BuiltInSheet(BuiltInStyleSheet);
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StyleSheet* GetUserContentSheet();
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StyleSheet* GetUserChromeSheet();
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static void Shutdown();
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static void SetUserContentCSSURL(nsIURI* aURI);
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
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// Set the shared memory segment to load the shared UA sheets from.
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// Called early on in a content process' life from
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// ContentChild::InitSharedUASheets, before the GlobalStyleSheetCache
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// singleton has been created.
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static void SetSharedMemory(mozilla::ipc::ReadOnlySharedMemoryHandle aHandle,
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uintptr_t aAddress);
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// Obtain a shared memory handle for the shared UA sheets to pass into a
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// content process. Called by ContentParent::InitInternal shortly after
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// a content process has been created.
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mozilla::ipc::ReadOnlySharedMemoryHandle CloneHandle();
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// Returns the address of the shared memory segment that holds the shared UA
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// sheets.
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uintptr_t GetSharedMemoryAddress() {
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return sSharedMemory.IsEmpty() ? 0 : uintptr_t(sSharedMemory.data());
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}
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// Size of the shared memory buffer we'll create to store the shared UA
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// sheets. We choose a value that is big enough on both 64 bit and 32 bit.
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//
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// If this isn't big enough for the current contents of the shared UA
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// sheets, we'll crash under InitSharedSheetsInParent.
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static constexpr size_t kSharedMemorySize = 1024 * 450;
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private:
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// Shared memory header.
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struct Header {
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static constexpr uint32_t kMagic = 0x55415353;
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uint32_t mMagic; // Must be set to kMagic.
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const StyleLockedCssRules* mSheets[size_t(BuiltInStyleSheet::Count)];
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uint8_t mBuffer[1];
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};
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GlobalStyleSheetCache();
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~GlobalStyleSheetCache();
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void InitFromProfile();
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void InitSharedSheetsInParent();
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void InitMemoryReporter();
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RefPtr<StyleSheet> LoadSheetURL(const nsACString& aURL,
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css::SheetParsingMode aParsingMode,
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css::FailureAction aFailureAction);
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RefPtr<StyleSheet> LoadSheetFile(nsIFile* aFile,
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css::SheetParsingMode aParsingMode);
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RefPtr<StyleSheet> LoadSheet(nsIURI* aURI, css::SheetParsingMode aParsingMode,
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css::FailureAction aFailureAction);
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void LoadSheetFromSharedMemory(const nsACString& aURL,
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RefPtr<StyleSheet>* aSheet,
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css::SheetParsingMode, const Header*,
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BuiltInStyleSheet);
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static StaticRefPtr<GlobalStyleSheetCache> gStyleCache;
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static StaticRefPtr<css::Loader> gCSSLoader;
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static StaticRefPtr<nsIURI> gUserContentSheetURL;
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EnumeratedArray<BuiltInStyleSheet, RefPtr<StyleSheet>,
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size_t(BuiltInStyleSheet::Count)>
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mBuiltIns;
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RefPtr<StyleSheet> mUserChromeSheet;
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RefPtr<StyleSheet> mUserContentSheet;
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// Shared memory segment storing shared style sheets.
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static mozilla::ipc::shared_memory::LeakedReadOnlyMapping sSharedMemory;
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// How much of the shared memory buffer we ended up using. Used for memory
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// reporting in the parent process.
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static size_t sUsedSharedMemory;
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};
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} // namespace mozilla
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#endif
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