[printing] Add COW identifier to elements kind

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index a51dc18d446d8097d3a9e18dde9aab25ebb0e9c6..3039d169fb553bbe085a8e81f568a5aecdc878bc 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -398,8 +398,12 @@ static void JSObjectPrintHeader(std::ostream& os, JSObject* obj,
   // fail when debugging.
   PrototypeIterator iter(obj->GetIsolate(), obj);

[Toon Verwaest, 2016/03/29 13:42:50]

Move iter down to where it's used.

   os << "\n - map = " << reinterpret_cast<void*>(obj->map()) << " ["
-     << ElementsKindToString(obj->map()->elements_kind())
-     << "]\n - prototype = " << reinterpret_cast<void*>(iter.GetCurrent());
+     << ElementsKindToString(obj->map()->elements_kind());
+  if (obj->elements()->map() == obj->GetHeap()->fixed_cow_array_map() ||
+      obj->elements()->map() == obj->GetHeap()->fixed_double_array_map()) {

[Toon Verwaest, 2016/03/29 13:42:50]

Just cow_array_map I presume :)

+    os << " (COW)";
+  }
+  os << "]\n - prototype = " << reinterpret_cast<void*>(iter.GetCurrent());
 }