Issue #2112 - Part 9: Remove handling for multiple style backends

layout/base/RestyleManagerHandle.h

@@ -10,7 +10,6 @@
 #include "mozilla/EventStates.h"
 #include "mozilla/HandleRefPtr.h"
 #include "mozilla/RefCountType.h"
-#include "mozilla/StyleBackendType.h"
 #include "nsChangeHint.h"
 
 namespace mozilla {
@@ -48,11 +47,6 @@ public:
   public:
     friend class ::mozilla::RestyleManagerHandle;
 
-    StyleBackendType BackendType() const
-    {
-      return StyleBackendType::Gecko;
-    }
-
     RestyleManager* AsGecko()
     {
       return reinterpret_cast<RestyleManager*>(mValue);

layout/base/nsLayoutUtils.cpp

@@ -9127,14 +9127,6 @@ nsLayoutUtils::GetCumulativeApzCallbackTransform(nsIFrame* aFrame)
   return delta;
 }
 
-/* static */ bool
-nsLayoutUtils::SupportsServoStyleBackend(nsIDocument* aDocument)
-{
-  return StyloEnabled() &&
-         aDocument->IsHTMLOrXHTML() &&
-         static_cast<nsDocument*>(aDocument)->IsContentDocument();
-}
-
 static
 bool
 LineHasNonEmptyContentWorker(nsIFrame* aFrame)

layout/base/nsLayoutUtils.h

@@ -2379,13 +2379,6 @@ public:
     return sTextCombineUprightDigitsEnabled;
   }
 
-  // Stylo (the Servo backend for Gecko's style system) is generally enabled
-  // or disabled at compile-time. However, we provide the additional capability
-  // to disable it dynamically in stylo-enabled builds via a pref.
-  static bool StyloEnabled() {
-    return false;
-  }
-
   static uint32_t IdlePeriodDeadlineLimit() {
     return sIdlePeriodDeadlineLimit;
   }
@@ -2813,14 +2806,6 @@ public:
    */
   static CSSPoint GetCumulativeApzCallbackTransform(nsIFrame* aFrame);
 
-  /*
-   * Returns whether the given document supports being rendered with a
-   * Servo-backed style system.  This checks whether Stylo is enabled
-   * globally, that the document is an HTML document, and that it is
-   * being presented in a content docshell.
-   */
-  static bool SupportsServoStyleBackend(nsIDocument* aDocument);
-
   /*
    * Checks whether a node is an invisible break.
    * If not, returns the first frame on the next line if such a next line exists.

layout/base/nsPresContext.cpp

@@ -889,7 +889,7 @@ nsPresContext::Init(nsDeviceContext* aDeviceContext)
 // Note: We don't hold a reference on the shell; it has a reference to
 // us
 void
-nsPresContext::AttachShell(nsIPresShell* aShell, StyleBackendType aBackendType)
+nsPresContext::AttachShell(nsIPresShell* aShell)
 {
   MOZ_ASSERT(!mShell);
   mShell = aShell;

layout/base/nsPresContext.h

@@ -42,7 +42,6 @@
 #include "mozilla/RestyleManagerHandle.h"
 #include "prenv.h"
 #include "mozilla/StaticPresData.h"
-#include "mozilla/StyleBackendType.h"
 
 class nsAString;
 class nsIPrintSettings;
@@ -167,7 +166,7 @@ public:
    * Set and detach presentation shell that this context is bound to.
    * A presentation context may only be bound to a single shell.
    */
-  void AttachShell(nsIPresShell* aShell, mozilla::StyleBackendType aBackendType);
+  void AttachShell(nsIPresShell* aShell);
   void DetachShell();
 
 

layout/base/nsPresShell.cpp

@@ -34,7 +34,6 @@
 #include "mozilla/TouchEvents.h"
 #include "mozilla/UniquePtr.h"
 #include "mozilla/Unused.h"
-#include "mozilla/StyleBackendType.h"
 #include <algorithm>
 
 #ifdef XP_WIN
@@ -889,8 +888,7 @@ PresShell::Init(nsIDocument* aDocument,
 
   // Bind the context to the presentation shell.
   mPresContext = aPresContext;
-  StyleBackendType backend = StyleBackendType::Gecko;
-  aPresContext->AttachShell(this, backend);
+  aPresContext->AttachShell(this);
 
   // Now we can initialize the style set. Make sure to set the member before
   // calling Init, since various subroutines need to find the style set off

layout/style/CSS.cpp

@@ -24,7 +24,6 @@ struct SupportsParsingInfo
   nsIURI* mDocURI;
   nsIURI* mBaseURI;
   nsIPrincipal* mPrincipal;
-  StyleBackendType mStyleBackendType;
 };
 
 static nsresult
@@ -44,7 +43,6 @@ GetParsingInfo(const GlobalObject& aGlobal,
   aInfo.mDocURI = nsCOMPtr<nsIURI>(doc->GetDocumentURI()).get();
   aInfo.mBaseURI = nsCOMPtr<nsIURI>(doc->GetBaseURI()).get();
   aInfo.mPrincipal = win->GetPrincipal();
-  aInfo.mStyleBackendType = doc->GetStyleBackendType();
   return NS_OK;
 }
 

layout/style/CSSStyleSheet.cpp

@@ -1083,7 +1083,7 @@ CSSStyleSheetInner::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
 
 CSSStyleSheet::CSSStyleSheet(css::SheetParsingMode aParsingMode,
                              CORSMode aCORSMode, ReferrerPolicy aReferrerPolicy)
-  : StyleSheet(StyleBackendType::Gecko, aParsingMode),
+  : StyleSheet(aParsingMode),
     mParent(nullptr),
     mOwnerRule(nullptr),
     mDirty(false),
@@ -1099,7 +1099,7 @@ CSSStyleSheet::CSSStyleSheet(css::SheetParsingMode aParsingMode,
                              CORSMode aCORSMode,
                              ReferrerPolicy aReferrerPolicy,
                              const SRIMetadata& aIntegrity)
-  : StyleSheet(StyleBackendType::Gecko, aParsingMode),
+  : StyleSheet(aParsingMode),
     mParent(nullptr),
     mOwnerRule(nullptr),
     mDirty(false),

layout/style/Declaration.h

@@ -92,7 +92,7 @@ public:
    * |mData|) and cannot be used until its |CompressFrom| method or
    * |InitializeEmpty| method is called.
    */
-  Declaration() : DeclarationBlock(StyleBackendType::Gecko) {}
+  Declaration() : DeclarationBlock() {}
 
   Declaration(const Declaration& aCopy);
 

layout/style/DeclarationBlock.h

@@ -12,7 +12,6 @@
 #define mozilla_DeclarationBlock_h
 
 #include "mozilla/ServoUtils.h"
-#include "mozilla/StyleBackendType.h"
 
 #include "nsCSSPropertyID.h"
 
@@ -30,11 +29,11 @@ class Rule;
 class DeclarationBlock
 {
 protected:
-  explicit DeclarationBlock(StyleBackendType aType)
-    : mImmutable(false), mType(aType) { mContainer.mRaw = 0; }
+  explicit DeclarationBlock()
+    : mImmutable(false) { mContainer.mRaw = 0; }
 
   DeclarationBlock(const DeclarationBlock& aCopy)
-    : DeclarationBlock(aCopy.mType) {}
+    : DeclarationBlock() {}
 
 public:
   MOZ_DECL_STYLO_METHODS(css::Declaration)
@@ -136,8 +135,6 @@ private:
   // set when declaration put in the rule tree;
   // also by ToString (hence the 'mutable').
   mutable bool mImmutable;
-
-  const StyleBackendType mType;
 };
 
 } // namespace mozilla

layout/style/ServoDeclarationBlock.h

@@ -59,7 +59,7 @@ public:
 protected:
   explicit ServoDeclarationBlock(
     already_AddRefed<RawServoDeclarationBlock> aRaw)
-    : DeclarationBlock(StyleBackendType::Servo), mRaw(aRaw) {}
+    : DeclarationBlock(), mRaw(aRaw) {}
 
 private:
   ~ServoDeclarationBlock() {}

layout/style/ServoStyleSheet.cpp

@@ -5,7 +5,6 @@
 
 #include "ServoBindings.h"
 #include "mozilla/ServoStyleSheet.h"
-#include "mozilla/StyleBackendType.h"
 #include "CSSRuleList.h"
 
 using namespace mozilla::dom;
@@ -16,7 +15,7 @@ ServoStyleSheet::ServoStyleSheet(css::SheetParsingMode aParsingMode,
                                  CORSMode aCORSMode,
                                  net::ReferrerPolicy aReferrerPolicy,
                                  const dom::SRIMetadata& aIntegrity)
-  : StyleSheet(StyleBackendType::Servo, aParsingMode)
+  : StyleSheet(aParsingMode)
   , mSheetInfo(aCORSMode, aReferrerPolicy, aIntegrity)
 {
 }

layout/style/StyleBackendType.h

@@ -1,22 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* 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_StyleBackendType_h
-#define mozilla_StyleBackendType_h
-
-namespace mozilla {
-
-/**
- * Enumeration that represents one of the two supported style system backends.
- */
-enum class StyleBackendType : uint8_t
-{
-  Gecko = 1,
-  Servo
-};
-
-} // namespace mozilla
-
-#endif // mozilla_StyleBackendType_h

layout/style/StyleSetHandle.h

@@ -9,7 +9,6 @@
 #include "mozilla/EventStates.h"
 #include "mozilla/RefPtr.h"
 #include "mozilla/SheetType.h"
-#include "mozilla/StyleBackendType.h"
 #include "mozilla/StyleSheet.h"
 #include "nsChangeHint.h"
 #include "nsCSSPseudoElements.h"
@@ -46,11 +45,6 @@ public:
   public:
     friend class ::mozilla::StyleSetHandle;
 
-    StyleBackendType BackendType() const
-    {
-      return StyleBackendType::Gecko;
-    }
-
     nsStyleSet* AsGecko()
     {
       return reinterpret_cast<nsStyleSet*>(mValue);

layout/style/StyleSheet.cpp

@@ -20,11 +20,10 @@ using namespace mozilla::dom;
 
 namespace mozilla {
 
-StyleSheet::StyleSheet(StyleBackendType aType, css::SheetParsingMode aParsingMode)
+StyleSheet::StyleSheet(css::SheetParsingMode aParsingMode)
   : mDocument(nullptr)
   , mOwningNode(nullptr)
   , mParsingMode(aParsingMode)
-  , mType(aType)
   , mDisabled(false)
   , mDocumentAssociationMode(NotOwnedByDocument)
 {
@@ -37,7 +36,6 @@ StyleSheet::StyleSheet(const StyleSheet& aCopy,
   , mDocument(aDocumentToUse)
   , mOwningNode(aOwningNodeToUse)
   , mParsingMode(aCopy.mParsingMode)
-  , mType(aCopy.mType)
   , mDisabled(aCopy.mDisabled)
     // We only use this constructor during cloning.  It's the cloner's
     // responsibility to notify us if we end up being owned by a document.

layout/style/StyleSheet.h

@@ -9,7 +9,6 @@
 #include "mozilla/css/SheetParsingMode.h"
 #include "mozilla/dom/CSSStyleSheetBinding.h"
 #include "mozilla/net/ReferrerPolicy.h"
-#include "mozilla/StyleBackendType.h"
 #include "mozilla/CORSMode.h"
 #include "mozilla/ServoUtils.h"
 
@@ -39,7 +38,7 @@ class StyleSheet : public nsIDOMCSSStyleSheet
                  , public nsWrapperCache
 {
 protected:
-  StyleSheet(StyleBackendType aType, css::SheetParsingMode aParsingMode);
+  StyleSheet(css::SheetParsingMode aParsingMode);
   StyleSheet(const StyleSheet& aCopy,
              nsIDocument* aDocumentToUse,
              nsINode* aOwningNodeToUse);
@@ -218,7 +217,6 @@ protected:
   // and/or useful in user sheets.
   css::SheetParsingMode mParsingMode;
 
-  const StyleBackendType mType;
   bool                  mDisabled;
 
   // mDocumentAssociationMode determines whether mDocument directly owns us (in

layout/style/moz.build

@@ -98,7 +98,6 @@ EXPORTS.mozilla += [
     'ServoUtils.h',
     'SheetType.h',
     'StyleAnimationValue.h',
-    'StyleBackendType.h',
     'StyleComplexColor.h',
     'StyleContextSource.h',
     'StyleSetHandle.h',