mirror of
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133 lines
4.4 KiB
C++
133 lines
4.4 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/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/UserAgentStyleSheetID.h"
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#include "mozilla/css/Loader.h"
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#include "mozilla/ipc/SharedMemory.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_, shared_) \
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NotNull<StyleSheet*> identifier_##Sheet();
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#include "mozilla/UserAgentStyleSheetList.h"
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#undef STYLE_SHEET
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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::SharedMemory::Handle 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::SharedMemoryHandle 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(UserAgentStyleSheetID::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 char* 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 char* aURL, RefPtr<StyleSheet>* aSheet,
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css::SheetParsingMode, Header*,
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UserAgentStyleSheetID);
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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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#define STYLE_SHEET(identifier_, url_, shared_) \
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RefPtr<StyleSheet> m##identifier_##Sheet;
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#include "mozilla/UserAgentStyleSheetList.h"
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#undef STYLE_SHEET
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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 Span<uint8_t> 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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