Fix Harmony Maps and WeakMaps for undefined values.

test/cctest/test-dictionary.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 30 matching lines @@
 
 TEST(ObjectHashTable) {
   v8::HandleScope scope;
   LocalContext context;
   Handle<ObjectHashTable> table = FACTORY->NewObjectHashTable(23);
   Handle<JSObject> a = FACTORY->NewJSArray(7);
   Handle<JSObject> b = FACTORY->NewJSArray(11);
   table = PutIntoObjectHashTable(table, a, b);
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK_EQ(table->Lookup(*a), *b);
-  CHECK_EQ(table->Lookup(*b), HEAP->undefined_value());
+  CHECK_EQ(table->Lookup(*b), HEAP->the_hole_value());
 
   // Keys still have to be valid after objects were moved.
   HEAP->CollectGarbage(NEW_SPACE);
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK_EQ(table->Lookup(*a), *b);
-  CHECK_EQ(table->Lookup(*b), HEAP->undefined_value());
+  CHECK_EQ(table->Lookup(*b), HEAP->the_hole_value());
 
   // Keys that are overwritten should not change number of elements.
   table = PutIntoObjectHashTable(table, a, FACTORY->NewJSArray(13));
   CHECK_EQ(table->NumberOfElements(), 1);
   CHECK_NE(table->Lookup(*a), *b);
 
-  // Keys mapped to undefined should be removed permanently.
-  table = PutIntoObjectHashTable(table, a, FACTORY->undefined_value());
+  // Keys mapped to the hole should be removed permanently.
+  table = PutIntoObjectHashTable(table, a, FACTORY->the_hole_value());
   CHECK_EQ(table->NumberOfElements(), 0);
   CHECK_EQ(table->NumberOfDeletedElements(), 1);
-  CHECK_EQ(table->Lookup(*a), HEAP->undefined_value());
+  CHECK_EQ(table->Lookup(*a), HEAP->the_hole_value());
 
   // Keys should map back to their respective values and also should get
   // an identity hash code generated.
   for (int i = 0; i < 100; i++) {
     Handle<JSObject> key = FACTORY->NewJSArray(7);
     Handle<JSObject> value = FACTORY->NewJSArray(11);
     table = PutIntoObjectHashTable(table, key, value);
     CHECK_EQ(table->NumberOfElements(), i + 1);
     CHECK_NE(table->FindEntry(*key), ObjectHashTable::kNotFound);
     CHECK_EQ(table->Lookup(*key), *value);
     CHECK(key->GetIdentityHash(OMIT_CREATION)->ToObjectChecked()->IsSmi());
   }
 
   // Keys never added to the map which already have an identity hash
   // code should not be found.
   for (int i = 0; i < 100; i++) {
     Handle<JSObject> key = FACTORY->NewJSArray(7);
     CHECK(key->GetIdentityHash(ALLOW_CREATION)->ToObjectChecked()->IsSmi());
     CHECK_EQ(table->FindEntry(*key), ObjectHashTable::kNotFound);
-    CHECK_EQ(table->Lookup(*key), HEAP->undefined_value());
+    CHECK_EQ(table->Lookup(*key), HEAP->the_hole_value());
     CHECK(key->GetIdentityHash(OMIT_CREATION)->ToObjectChecked()->IsSmi());
   }
 
   // Keys that don't have an identity hash should not be found and also
   // should not get an identity hash code generated.
   for (int i = 0; i < 100; i++) {
     Handle<JSObject> key = FACTORY->NewJSArray(7);
-    CHECK_EQ(table->Lookup(*key), HEAP->undefined_value());
+    CHECK_EQ(table->Lookup(*key), HEAP->the_hole_value());
     CHECK_EQ(key->GetIdentityHash(OMIT_CREATION), HEAP->undefined_value());
   }
 }
 
 
 #ifdef DEBUG
 TEST(ObjectHashSetCausesGC) {
   v8::HandleScope scope;
   LocalContext context;
   Handle<ObjectHashSet> table = FACTORY->NewObjectHashSet(1);
@@ skipping 26 matching lines @@
   // in subsequent calls will request GC.
   FLAG_gc_interval = 0;
 
   // Calling Lookup() should not cause GC ever.
   CHECK(table->Lookup(*key)->IsUndefined());
 
   // Calling Put() should request GC by returning a failure.
   CHECK(table->Put(*key, *key)->IsRetryAfterGC());
 }
 #endif