[Invalidation Tracking] Trace StyleInvalidator setNeedsStyleRecalc

Source/core/css/invalidation/DescendantInvalidationSet.cpp

Index: Source/core/css/invalidation/DescendantInvalidationSet.cpp
diff --git a/Source/core/css/invalidation/DescendantInvalidationSet.cpp b/Source/core/css/invalidation/DescendantInvalidationSet.cpp
index 232f3cfe9b14348d607baf9ee7162d9ea459874d..4b20946b00ece2d98d5a2ed7f39a3e966ac5584c 100644
--- a/Source/core/css/invalidation/DescendantInvalidationSet.cpp
+++ b/Source/core/css/invalidation/DescendantInvalidationSet.cpp
@@ -33,6 +33,8 @@
 
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Element.h"
+#include "core/inspector/InspectorTraceEvents.h"
+#include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
@@ -48,24 +50,32 @@ bool DescendantInvalidationSet::invalidatesElement(Element& element) const
     if (m_allDescendantsMightBeInvalid)
         return true;
 
-    if (m_tagNames && m_tagNames->contains(element.tagQName().localName()))
+    if (m_tagNames && m_tagNames->contains(element.tagQName().localName())) {
+        TRACE_STYLE_INVALIDATOR_INVALIDATION_EXTRADATA(element, InvalidationSetMatchedTagName, element.tagQName().localName());
         return true;
+    }
 
-    if (element.hasID() && m_ids && m_ids->contains(element.idForStyleResolution()))
+    if (element.hasID() && m_ids && m_ids->contains(element.idForStyleResolution())) {
+        TRACE_STYLE_INVALIDATOR_INVALIDATION_EXTRADATA(element, InvalidationSetMatchedId, element.idForStyleResolution());
         return true;
+    }
 
     if (element.hasClass() && m_classes) {
         const SpaceSplitString& classNames = element.classNames();
         for (WillBeHeapHashSet<AtomicString>::const_iterator it = m_classes->begin(); it != m_classes->end(); ++it) {
-            if (classNames.contains(*it))
+            if (classNames.contains(*it)) {
+                TRACE_STYLE_INVALIDATOR_INVALIDATION_EXTRADATA(element, InvalidationSetMatchedClass, *it);
                 return true;
+            }
         }
     }
 
     if (element.hasAttributes() && m_attributes) {
         for (WillBeHeapHashSet<AtomicString>::const_iterator it = m_attributes->begin(); it != m_attributes->end(); ++it) {
-            if (element.hasAttribute(*it))
+            if (element.hasAttribute(*it)) {
+                TRACE_STYLE_INVALIDATOR_INVALIDATION_EXTRADATA(element, InvalidationSetMatchedAttribute, *it);
                 return true;
+            }
         }
     }
 
@@ -193,33 +203,53 @@ void DescendantInvalidationSet::trace(Visitor* visitor)
 #endif
 }
 
-#ifndef NDEBUG
-void DescendantInvalidationSet::show() const
+String DescendantInvalidationSet::toString() const
 {
-    fprintf(stderr, "DescendantInvalidationSet { ");
+    StringBuilder builder;
+    builder.append("DescendantInvalidationSet { ");
     if (m_allDescendantsMightBeInvalid)
-        fprintf(stderr, "* ");
+        builder.append("* ");
     if (m_customPseudoInvalid)
-        fprintf(stderr, "::custom ");
+        builder.append("::custom ");
     if (m_treeBoundaryCrossing)
-        fprintf(stderr, "::shadow/deep/ ");
+        builder.append("::shadow/deep/ ");
     if (m_ids) {
-        for (WillBeHeapHashSet<AtomicString>::const_iterator it = m_ids->begin(); it != m_ids->end(); ++it)
-            fprintf(stderr, "#%s ", (*it).ascii().data());
+        for (const auto& id : *m_ids) {
+            builder.append("#");
+            builder.append(id);
+            builder.append(" ");
+        }
     }
     if (m_classes) {
-        for (WillBeHeapHashSet<AtomicString>::const_iterator it = m_classes->begin(); it != m_classes->end(); ++it)
-            fprintf(stderr, ".%s ", (*it).ascii().data());
+        for (const auto& className : *m_classes) {
+            builder.append(".");
+            builder.append(className);
+            builder.append(" ");
+        }
     }
     if (m_tagNames) {
-        for (WillBeHeapHashSet<AtomicString>::const_iterator it = m_tagNames->begin(); it != m_tagNames->end(); ++it)
-            fprintf(stderr, "<%s> ", (*it).ascii().data());
+        for (const auto& tagName : *m_tagNames) {
+            builder.append("<");
+            builder.append(tagName);
+            builder.append("> ");
+        }
     }
     if (m_attributes) {
-        for (WillBeHeapHashSet<AtomicString>::const_iterator it = m_attributes->begin(); it != m_attributes->end(); ++it)
-            fprintf(stderr, "[%s] ", (*it).ascii().data());
+        for (const auto& attribute : *m_attributes) {
+            builder.append("[");
+            builder.append(attribute);
+            builder.append("] ");
+        }
     }
-    fprintf(stderr, "}\n");
+    builder.append("}");
+
+    return builder.toString();
+}
+
+#ifndef NDEBUG
+void DescendantInvalidationSet::show() const
+{
+    fprintf(stderr, "%s\n", toString().ascii().data());
 }
 #endif // NDEBUG