ES6: Add support for Map and Set Iterator

src/objects-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #include "disassembler.h"
 #include "disasm.h"
 #include "jsregexp.h"
 #include "macro-assembler.h"
@@ skipping 683 matching lines @@
   CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
   // TODO(arv): Verify OrderedHashTable too.
 }
 
 
 void JSSetIterator::JSSetIteratorVerify() {
   CHECK(IsJSSetIterator());
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
-  CHECK(index()->IsSmi());
-  CHECK(kind()->IsSmi());
+  CHECK(index()->IsSmi() || index()->IsUndefined());
+  CHECK(kind()->IsSmi() || kind()->IsUndefined());
 }
 
 
 void JSMapIterator::JSMapIteratorVerify() {
   CHECK(IsJSMapIterator());
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
-  CHECK(index()->IsSmi());
-  CHECK(kind()->IsSmi());
+  CHECK(index()->IsSmi() || index()->IsUndefined());
+  CHECK(kind()->IsSmi() || kind()->IsUndefined());
 }
 
 
 void JSWeakMap::JSWeakMapVerify() {
   CHECK(IsJSWeakMap());
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsHashTable() || table()->IsUndefined());
 }
 
@@ skipping 458 matching lines @@
   for (int i = 0; i < number_of_transitions(); ++i) {
     if (!CheckOneBackPointer(current_map, GetTarget(i))) return false;
   }
   return true;
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal