deps: cherry-pick b93c80a from v8 upstream

Original commit message: If we can't rehash the backing store for weak sets & maps, do a last resort GC BUG=v8:4909 [email protected] Committed: https://crrev.com/b93c80a6039c757723e70420ae73375b5d277814 Cr-Commit-Position: refs/heads/master@{#37591} Fixes: nodejs#6180 PR-URL: nodejs#7689 Reviewed-By: Matt Loring <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]>
ofrobots · Aug 25, 2016 · 3b2f692 · 3b2f692
1 parent c4401d2
commit 3b2f692
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/deps/v8/src/objects.cc b/deps/v8/src/objects.cc
@@ -18740,6 +18740,19 @@ Handle<ObjectHashTable> ObjectHashTable::Put(Handle<ObjectHashTable> table,
   if ((table->NumberOfDeletedElements() << 1) > table->NumberOfElements()) {
     table->Rehash(isolate->factory()->undefined_value());
   }
+  // If we're out of luck, we didn't get a GC recently, and so rehashing
+  // isn't enough to avoid a crash.
+  int nof = table->NumberOfElements() + 1;
+  if (!table->HasSufficientCapacity(nof)) {
+    int capacity = ObjectHashTable::ComputeCapacity(nof * 2);
+    if (capacity > ObjectHashTable::kMaxCapacity) {
+      for (size_t i = 0; i < 2; ++i) {
+        isolate->heap()->CollectAllGarbage(
+            Heap::kFinalizeIncrementalMarkingMask, "full object hash table");
+      }
+      table->Rehash(isolate->factory()->undefined_value());
+    }
+  }
 
   // Check whether the hash table should be extended.
   table = EnsureCapacity(table, 1, key);