[WIP] do something :-)

Source/core/style/ComputedStyle.cpp

 /*
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 28 matching lines @@
 #include "platform/LengthFunctions.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/fonts/Font.h"
 #include "platform/fonts/FontSelector.h"
 #include "platform/geometry/FloatRoundedRect.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/transforms/RotateTransformOperation.h"
 #include "platform/transforms/ScaleTransformOperation.h"
 #include "platform/transforms/TranslateTransformOperation.h"
 #include "wtf/MathExtras.h"
+#include "wtf/SizeAssertions.h"
 
 #include <algorithm>
 
 namespace blink {
 
-struct SameSizeAsBorderValue {
-    RGBA32 m_color;
-    unsigned m_width;
-};
-
-static_assert(sizeof(BorderValue) == sizeof(SameSizeAsBorderValue), "BorderValue should stay small");
-
-struct SameSizeAsComputedStyle : public RefCounted<SameSizeAsComputedStyle> {
-    void* dataRefs[7];
-    void* ownPtrs[1];
-    void* dataRefSvgStyle;
-
-    struct InheritedFlags {
-        unsigned m_bitfields[2];
-    } inherited_flags;
-
-    struct NonInheritedFlags {
-        unsigned m_bitfields[2];
-    } noninherited_flags;
-};
-
-static_assert(sizeof(ComputedStyle) == sizeof(SameSizeAsComputedStyle), "ComputedStyle should stay small");
+ASSERT_SIZE(BorderValue, 8, 8);
+ASSERT_SIZE(ComputedStyle, 56, 96);
 
 PassRefPtr<ComputedStyle> ComputedStyle::create()
 {
     return adoptRef(new ComputedStyle());
 }
 
 PassRefPtr<ComputedStyle> ComputedStyle::createInitialStyle()
 {
     return adoptRef(new ComputedStyle(InitialStyle));
 }
@@ skipping 1713 matching lines @@
 }
 
 void ComputedStyle::copyChildDependentFlagsFrom(const ComputedStyle& other)
 {
     setEmptyState(other.emptyState());
     if (other.hasExplicitlyInheritedProperties())
         setHasExplicitlyInheritedProperties();
 }
 
 } // namespace blink