HashTable check

third_party/WebKit/Source/platform/wtf/HashTable.h

Index: third_party/WebKit/Source/platform/wtf/HashTable.h
diff --git a/third_party/WebKit/Source/platform/wtf/HashTable.h b/third_party/WebKit/Source/platform/wtf/HashTable.h
index 041cdcec3b0daabbabdbf43362909d2b788bb195..c05985b57f873d45a9c4c09dd4aa0b3633b90402 100644
--- a/third_party/WebKit/Source/platform/wtf/HashTable.h
+++ b/third_party/WebKit/Source/platform/wtf/HashTable.h
@@ -792,6 +792,10 @@ class HashTable final
   void leaveAccessForbiddenScope() { m_accessForbidden = false; }
   bool accessForbidden() const { return m_accessForbidden; }
   int64_t modifications() const { return m_modifications; }
+  void checkCreationThread() const {
+    DCHECK(!Allocator::isGarbageCollected ||
+           m_creationThread == currentThread());
+  }
   void registerModification() { m_modifications++; }
   // HashTable and collections that build on it do not support modifications
   // while there is an iterator in use. The exception is ListHashSet, which
@@ -894,6 +898,7 @@ class HashTable final
   unsigned m_queueFlag : 1;
   unsigned m_accessForbidden : 1;
   unsigned m_modifications;
+  ThreadIdentifier m_creationThread;
 #else
   unsigned m_deletedCount : 31;
   unsigned m_queueFlag : 1;
@@ -949,6 +954,10 @@ inline HashTable<Key,
       m_stats(nullptr)
 #endif
 {
+#if DCHECK_IS_ON()
+  if (Allocator::isGarbageCollected)
+    m_creationThread = currentThread();
+#endif
   static_assert(Allocator::isGarbageCollected ||
                     (!IsPointerToGarbageCollectedType<Key>::value &&
                      !IsPointerToGarbageCollectedType<Value>::value),
@@ -1230,6 +1239,7 @@ typename HashTable<Key,
                    Allocator>::AddResult
 HashTable<Key, Value, Extractor, HashFunctions, Traits, KeyTraits, Allocator>::
     add(T&& key, Extra&& extra) {
+  checkCreationThread();
   DCHECK(!accessForbidden());
   DCHECK(Allocator::isAllocationAllowed());
   if (!m_table)
@@ -1827,6 +1837,10 @@ HashTable<Key, Value, Extractor, HashFunctions, Traits, KeyTraits, Allocator>::
       m_stats(HashTableStatsPtr<Allocator>::copy(other.m_stats))
 #endif
 {
+#if DCHECK_IS_ON()
+  if (Allocator::isGarbageCollected)
+    m_creationThread = currentThread();
+#endif
   if (other.size())
     reserveCapacityForSize(other.size());
   // Copy the hash table the dumb way, by adding each element to the new
@@ -1860,6 +1874,10 @@ HashTable<Key, Value, Extractor, HashFunctions, Traits, KeyTraits, Allocator>::
       m_stats(HashTableStatsPtr<Allocator>::copy(other.m_stats))
 #endif
 {
+#if DCHECK_IS_ON()
+  if (Allocator::isGarbageCollected)
+    m_creationThread = currentThread();
+#endif
   swap(other);
 }