Statistics of LayoutBox rare data reasons

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 83 matching lines @@
 #endif
 
 namespace blink {
 
 namespace {
 
 static bool gModifyLayoutTreeStructureAnyState = false;
 
 }  // namespace
 
+int RareDataStat::s_reasonCounts[MaxReason] = {0};
+
+int* rareDataReasonCounts() {
+  return RareDataStat::s_reasonCounts;
+}
+
 #if DCHECK_IS_ON()
 
 LayoutObject::SetLayoutNeededForbiddenScope::SetLayoutNeededForbiddenScope(
     LayoutObject& layoutObject)
     : m_layoutObject(layoutObject),
       m_preexistingForbidden(m_layoutObject.isSetNeedsLayoutForbidden()) {
   m_layoutObject.setNeedsLayoutIsForbidden(true);
 }
 
 LayoutObject::SetLayoutNeededForbiddenScope::~SetLayoutNeededForbiddenScope() {
   m_layoutObject.setNeedsLayoutIsForbidden(m_preexistingForbidden);
 }
 #endif
 
 struct SameSizeAsLayoutObject : DisplayItemClient {
   virtual ~SameSizeAsLayoutObject() {}  // Allocate vtable pointer.
   void* pointers[5];
   Member<void*> members[1];
 #if DCHECK_IS_ON()
   unsigned m_debugBitfields : 2;
 #endif
   unsigned m_bitfields;
   unsigned m_bitfields2;
   LayoutRect m_visualRect;
   LayoutPoint m_paintOffset;
   std::unique_ptr<void*> m_paintProperties;
 };
 
-static_assert(sizeof(LayoutObject) == sizeof(SameSizeAsLayoutObject),
-              "LayoutObject should stay small");
+// static_assert(sizeof(LayoutObject) == sizeof(SameSizeAsLayoutObject),
+// "LayoutObject should stay small");
 
 bool LayoutObject::s_affectsParentBlock = false;
 
 void* LayoutObject::operator new(size_t sz) {
   ASSERT(isMainThread());
   return PartitionAlloc(WTF::Partitions::layoutPartition(), sz,
                         WTF_HEAP_PROFILER_TYPE_NAME(LayoutObject));
 }
 
 void LayoutObject::operator delete(void* ptr) {
@@ skipping 81 matching lines @@
       m_previous(nullptr),
       m_next(nullptr),
 #if DCHECK_IS_ON()
       m_hasAXObject(false),
       m_setNeedsLayoutForbidden(false),
 #endif
       m_bitfields(node) {
   InstanceCounters::incrementCounter(InstanceCounters::LayoutObjectCounter);
   if (m_node)
     frameView()->incrementLayoutObjectCount();
+
+  m_rareStat.addReason(ReasonLOAll);
 }
 
 LayoutObject::~LayoutObject() {
 #if DCHECK_IS_ON()
   DCHECK(!m_hasAXObject);
 #endif
   InstanceCounters::decrementCounter(InstanceCounters::LayoutObjectCounter);
 }
 
 bool LayoutObject::isDescendantOf(const LayoutObject* obj) const {
@@ skipping 958 matching lines @@
   ObjectPaintInvalidator paintInvalidator(*this);
   context.oldVisualRect = visualRect();
   context.oldLocation = paintInvalidator.locationInBacking();
   LayoutRect newVisualRect =
       paintInvalidationState.computeVisualRectInBacking();
   context.newLocation =
       paintInvalidationState.computeLocationInBacking(newVisualRect.location());
 
   setVisualRect(newVisualRect);
   paintInvalidator.setLocationInBacking(context.newLocation);
+  if (!newVisualRect.isEmpty() &&
+      newVisualRect.location() != context.newLocation) {
+    m_rareStat.addReason(ReasonLocationOffsetObject);
+    if (isBox())
+      m_rareStat.addReason(ReasonLocationOffsetBox);
+    if (isText())
+      m_rareStat.addReason(ReasonLocationOffsetText);
+    if (isLayoutInline())
+      m_rareStat.addReason(ReasonLocationOffsetInline);
+    if (isSVG())
+      m_rareStat.addReason(ReasonLocationOffsetSVG);
+  }
 
   if (!shouldCheckForPaintInvalidation() &&
       paintInvalidationState
           .forcedSubtreeInvalidationRectUpdateWithinContainerOnly()) {
     // We are done updating the visual rect. No other paint invalidation work
     // to do for this object.
     return PaintInvalidationNone;
   }
 
   return invalidatePaintIfNeeded(context);
@@ skipping 2422 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif