Statistics of LayoutBox rare data reasons

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 232 matching lines @@
   MarginInfo m_marginInfo;
   LayoutUnit m_previousFloatLogicalBottom;
   EBreakBetween m_previousBreakAfterValue;
   bool m_isAtFirstInFlowChild;
 };
 
 LayoutBlockFlow::LayoutBlockFlow(ContainerNode* node) : LayoutBlock(node) {
   static_assert(sizeof(MarginInfo) == sizeof(SameSizeAsMarginInfo),
                 "MarginInfo should stay small");
   setChildrenInline(true);
+  m_rareStat.addReason(ReasonLBFAll);
 }
 
 LayoutBlockFlow::~LayoutBlockFlow() {}
 
 LayoutBlockFlow* LayoutBlockFlow::createAnonymous(Document* document) {
   LayoutBlockFlow* layoutBlockFlow = new LayoutBlockFlow(nullptr);
   layoutBlockFlow->setDocumentForAnonymous(document);
   return layoutBlockFlow;
 }
 
@@ skipping 16 matching lines @@
       return true;
   }
   return relayoutChildren;
 }
 
 void LayoutBlockFlow::setBreakAtLineToAvoidWidow(int lineToBreak) {
   ASSERT(lineToBreak >= 0);
   ensureRareData();
   ASSERT(!m_rareData->m_didBreakAtLineToAvoidWidow);
   m_rareData->m_lineBreakToAvoidWidow = lineToBreak;
+  m_rareStat.addReason(ReasonLBFLineBreakToAvoidWidow);
 }
 
 void LayoutBlockFlow::setDidBreakAtLineToAvoidWidow() {
   ASSERT(!shouldBreakAtLineToAvoidWidow());
 
   // This function should be called only after a break was applied to avoid
   // widows so assert |m_rareData| exists.
   ASSERT(m_rareData);
 
   m_rareData->m_didBreakAtLineToAvoidWidow = true;
@@ skipping 1923 matching lines @@
     return;
   }
 
   if (!m_rareData && !value)
     return;
 
   if (!m_rareData)
     m_rareData = WTF::makeUnique<LayoutBlockFlowRareData>(this);
 
   m_rareData->m_discardMarginBefore = value;
+
+  if (value)
+    m_rareStat.addReason(ReasonLBFDiscardMargin);
 }
 
 void LayoutBlockFlow::setMustDiscardMarginAfter(bool value) {
   if (style()->marginAfterCollapse() == MarginCollapseDiscard) {
     ASSERT(value);
     return;
   }
 
   if (!m_rareData && !value)
     return;
 
   if (!m_rareData)
     m_rareData = WTF::makeUnique<LayoutBlockFlowRareData>(this);
 
   m_rareData->m_discardMarginAfter = value;
+
+  if (value)
+    m_rareStat.addReason(ReasonLBFDiscardMargin);
 }
 
 bool LayoutBlockFlow::mustDiscardMarginBefore() const {
   return style()->marginBeforeCollapse() == MarginCollapseDiscard ||
          (m_rareData && m_rareData->m_discardMarginBefore);
 }
 
 bool LayoutBlockFlow::mustDiscardMarginAfter() const {
   return style()->marginAfterCollapse() == MarginCollapseDiscard ||
          (m_rareData && m_rareData->m_discardMarginAfter);
@@ skipping 40 matching lines @@
 
 void LayoutBlockFlow::setMaxMarginBeforeValues(LayoutUnit pos, LayoutUnit neg) {
   if (!m_rareData) {
     if (pos == LayoutBlockFlowRareData::positiveMarginBeforeDefault(this) &&
         neg == LayoutBlockFlowRareData::negativeMarginBeforeDefault(this))
       return;
     m_rareData = WTF::makeUnique<LayoutBlockFlowRareData>(this);
   }
   m_rareData->m_margins.setPositiveMarginBefore(pos);
   m_rareData->m_margins.setNegativeMarginBefore(neg);
+  m_rareStat.addReason(ReasonLBFMargin);
 }
 
 void LayoutBlockFlow::setMaxMarginAfterValues(LayoutUnit pos, LayoutUnit neg) {
   if (!m_rareData) {
     if (pos == LayoutBlockFlowRareData::positiveMarginAfterDefault(this) &&
         neg == LayoutBlockFlowRareData::negativeMarginAfterDefault(this))
       return;
     m_rareData = WTF::makeUnique<LayoutBlockFlowRareData>(this);
   }
   m_rareData->m_margins.setPositiveMarginAfter(pos);
   m_rareData->m_margins.setNegativeMarginAfter(neg);
+  m_rareStat.addReason(ReasonLBFMargin);
 }
 
 bool LayoutBlockFlow::mustSeparateMarginBeforeForChild(
     const LayoutBox& child) const {
   ASSERT(!child.selfNeedsLayout());
   const ComputedStyle& childStyle = child.styleRef();
   if (!child.isWritingModeRoot())
     return childStyle.marginBeforeCollapse() == MarginCollapseSeparate;
   if (child.isHorizontalWritingMode() == isHorizontalWritingMode())
     return childStyle.marginAfterCollapse() == MarginCollapseSeparate;
@@ skipping 1802 matching lines @@
 }
 
 void LayoutBlockFlow::setPaginationStrutPropagatedFromChild(LayoutUnit strut) {
   strut = std::max(strut, LayoutUnit());
   if (!m_rareData) {
     if (!strut)
       return;
     m_rareData = WTF::makeUnique<LayoutBlockFlowRareData>(this);
   }
   m_rareData->m_paginationStrutPropagatedFromChild = strut;
+  m_rareStat.addReason(ReasonLBFPaginationStrutFromChild);
 }
 
 void LayoutBlockFlow::setFirstForcedBreakOffset(LayoutUnit blockOffset) {
   if (!m_rareData) {
     if (!blockOffset)
       return;
     m_rareData = WTF::makeUnique<LayoutBlockFlowRareData>(this);
   }
   m_rareData->m_firstForcedBreakOffset = blockOffset;
 }
@@ skipping 142 matching lines @@
   m_paginationStateChanged = true;
 
   // Check that addChild() put the flow thread as a direct child, and didn't do
   // fancy things.
   ASSERT(flowThread->parent() == this);
 
   flowThread->populate();
   LayoutBlockFlowRareData& rareData = ensureRareData();
   ASSERT(!rareData.m_multiColumnFlowThread);
   rareData.m_multiColumnFlowThread = flowThread;
+  m_rareStat.addReason(ReasonLBFMultiColumnFlowThread);
 }
 
 LayoutBlockFlow::LayoutBlockFlowRareData& LayoutBlockFlow::ensureRareData() {
   if (m_rareData)
     return *m_rareData;
 
   m_rareData = WTF::makeUnique<LayoutBlockFlowRareData>(this);
   return *m_rareData;
 }
 
@@ skipping 290 matching lines @@
   return LayoutBlock::invalidatePaintIfNeeded(paintInvalidationState);
 }
 
 void LayoutBlockFlow::invalidateDisplayItemClients(
     PaintInvalidationReason invalidationReason) const {
   BlockFlowPaintInvalidator(*this).invalidateDisplayItemClients(
       invalidationReason);
 }
 
 }  // namespace blink