Remove all encountered weak maps from the list of weak collections when incremental marking is abor…

test/cctest/test-weakmaps.cc

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@@ skipping 237 matching lines @@
                    Handle<Smi>(Smi::FromInt(i), isolate));
   }
 
   // Force compacting garbage collection. The subsequent collections are used
   // to verify that key references were actually updated.
   CHECK(FLAG_always_compact);
   heap->CollectAllGarbage(Heap::kNoGCFlags);
   heap->CollectAllGarbage(Heap::kNoGCFlags);
   heap->CollectAllGarbage(Heap::kNoGCFlags);
 }
+
+
+TEST(Regress399527) {
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
+  Isolate* isolate = CcTest::i_isolate();
+  Heap* heap = isolate->heap();
+  {
+    HandleScope scope(isolate);
+    Handle<JSWeakMap> weak_map = AllocateJSWeakMap(isolate);
+    CHECK(*weak_map != NULL);

[Michael Starzinger, 2014/08/04 15:35:30]

nit: Can we just drop the "weak_map" local variable?

[Hannes Payer (out of office), 2014/08/04 16:09:35]

Done.

+    SimulateIncrementalMarking(heap);
+  }
+  // The weak map is marked black here but leaving the handle scope will make
+  // the object unreachable. Aborting incremental marking will clear all the
+  // marking bits which makes the weak map garbage.
+  heap->CollectAllGarbage(Heap::kAbortIncrementalMarkingMask);
+}