Statistics of LayoutBox rare data reasons

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. 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
@@ skipping 85 matching lines @@
       m_hasMarkupTruncation(false),
       m_widthAvailableToChildrenChanged(false),
       m_heightAvailableToChildrenChanged(false),
       m_isSelfCollapsing(false),
       m_descendantsWithFloatsMarkedForLayout(false),
       m_hasPositionedObjects(false),
       m_hasPercentHeightDescendants(false),
       m_paginationStateChanged(false) {
   // LayoutBlockFlow calls setChildrenInline(true).
   // By default, subclasses do not have inline children.
+  m_rareStat.addReason(ReasonLBLAll);
 }
 
 void LayoutBlock::removeFromGlobalMaps() {
   if (hasPositionedObjects()) {
     std::unique_ptr<TrackedLayoutBoxListHashSet> descendants =
         gPositionedDescendantsMap->take(this);
     ASSERT(!descendants->isEmpty());
     for (LayoutBox* descendant : *descendants) {
       ASSERT(gPositionedContainerMap->at(descendant) == this);
       gPositionedContainerMap->erase(descendant);
@@ skipping 832 matching lines @@
   if (!gPositionedDescendantsMap)
     gPositionedDescendantsMap = new TrackedDescendantsMap;
   TrackedLayoutBoxListHashSet* descendantSet =
       gPositionedDescendantsMap->at(this);
   if (!descendantSet) {
     descendantSet = new TrackedLayoutBoxListHashSet;
     gPositionedDescendantsMap->set(this, WTF::wrapUnique(descendantSet));
   }
   descendantSet->insert(o);
 
+  o->m_rareStat.addReason(ReasonLBPositionedContainer);
+  m_rareStat.addReason(ReasonLBLPositionedDescendants);
+
   m_hasPositionedObjects = true;
 }
 
 void LayoutBlock::removePositionedObject(LayoutBox* o) {
   if (!gPositionedContainerMap)
     return;
 
   LayoutBlock* container = gPositionedContainerMap->take(o);
   if (!container)
     return;
@@ skipping 89 matching lines @@
   if (!gPercentHeightDescendantsMap)
     gPercentHeightDescendantsMap = new TrackedDescendantsMap;
   TrackedLayoutBoxListHashSet* descendantSet =
       gPercentHeightDescendantsMap->at(this);
   if (!descendantSet) {
     descendantSet = new TrackedLayoutBoxListHashSet;
     gPercentHeightDescendantsMap->set(this, WTF::wrapUnique(descendantSet));
   }
   descendantSet->insert(descendant);
 
+  m_rareStat.addReason(ReasonLBLPercentHeightDescendants);
+
   m_hasPercentHeightDescendants = true;
 }
 
 void LayoutBlock::removePercentHeightDescendant(LayoutBox* descendant) {
   if (TrackedLayoutBoxListHashSet* descendants = percentHeightDescendants()) {
     descendants->erase(descendant);
     descendant->setPercentHeightContainer(nullptr);
     if (descendants->isEmpty()) {
       gPercentHeightDescendantsMap->erase(this);
       m_hasPercentHeightDescendants = false;
@@ skipping 1089 matching lines @@
   }
 
   return availableHeight;
 }
 
 bool LayoutBlock::hasDefiniteLogicalHeight() const {
   return availableLogicalHeightForPercentageComputation() != LayoutUnit(-1);
 }
 
 }  // namespace blink