ES6: Add support for Map/Set forEach

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 023caa5ddf93f7a2fdf595121a0581553a23440f..8f98dd8883bc4e253df32476ce63ad5def5996e6 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -696,6 +696,8 @@ bool Object::IsJSProxy() {
 TYPE_CHECKER(JSFunctionProxy, JS_FUNCTION_PROXY_TYPE)
 TYPE_CHECKER(JSSet, JS_SET_TYPE)
 TYPE_CHECKER(JSMap, JS_MAP_TYPE)
+TYPE_CHECKER(JSSetIterator, JS_SET_ITERATOR_TYPE)
+TYPE_CHECKER(JSMapIterator, JS_MAP_ITERATOR_TYPE)
 TYPE_CHECKER(JSWeakMap, JS_WEAK_MAP_TYPE)
 TYPE_CHECKER(JSWeakSet, JS_WEAK_SET_TYPE)
 TYPE_CHECKER(JSContextExtensionObject, JS_CONTEXT_EXTENSION_OBJECT_TYPE)
@@ -1916,6 +1918,10 @@ int JSObject::GetHeaderSize() {
       return JSSet::kSize;
     case JS_MAP_TYPE:
       return JSMap::kSize;
+    case JS_SET_ITERATOR_TYPE:
+      return JSSetIterator::kSize;
+    case JS_MAP_ITERATOR_TYPE:
+      return JSMapIterator::kSize;
     case JS_WEAK_MAP_TYPE:
       return JSWeakMap::kSize;
     case JS_WEAK_SET_TYPE:
@@ -2976,6 +2982,8 @@ CAST_ACCESSOR(JSProxy)
 CAST_ACCESSOR(JSFunctionProxy)
 CAST_ACCESSOR(JSSet)
 CAST_ACCESSOR(JSMap)
+CAST_ACCESSOR(JSSetIterator)
+CAST_ACCESSOR(JSMapIterator)
 CAST_ACCESSOR(JSWeakMap)
 CAST_ACCESSOR(JSWeakSet)
 CAST_ACCESSOR(Foreign)
@@ -5807,6 +5815,32 @@ void JSProxy::InitializeBody(int object_size, Object* value) {
 
 ACCESSORS(JSSet, table, Object, kTableOffset)
 ACCESSORS(JSMap, table, Object, kTableOffset)
+
+
+#define ORDERED_HASH_TABLE_ITERATOR_ACCESSORS(name, type, offset)    \
+  template<class Derived, class TableType>                           \
+  type* OrderedHashTableIterator<Derived, TableType>::name() {       \
+    return type::cast(READ_FIELD(this, offset));                     \
+  }                                                                  \
+  template<class Derived, class TableType>                           \
+  void OrderedHashTableIterator<Derived, TableType>::set_##name(     \
+      type* value, WriteBarrierMode mode) {                          \
+    WRITE_FIELD(this, offset, value);                                \
+    CONDITIONAL_WRITE_BARRIER(GetHeap(), this, offset, value, mode); \
+  }
+
+ORDERED_HASH_TABLE_ITERATOR_ACCESSORS(table, Object, kTableOffset)
+ORDERED_HASH_TABLE_ITERATOR_ACCESSORS(index, Smi, kIndexOffset)
+ORDERED_HASH_TABLE_ITERATOR_ACCESSORS(count, Smi, kCountOffset)
+ORDERED_HASH_TABLE_ITERATOR_ACCESSORS(kind, Smi, kKindOffset)
+ORDERED_HASH_TABLE_ITERATOR_ACCESSORS(next_iterator, Object,
+                                      kNextIteratorOffset)
+ORDERED_HASH_TABLE_ITERATOR_ACCESSORS(previous_iterator, Object,
+                                      kPreviousIteratorOffset)
+
+#undef ORDERED_HASH_TABLE_ITERATOR_ACCESSORS
+
+
 ACCESSORS(JSWeakCollection, table, Object, kTableOffset)
 ACCESSORS(JSWeakCollection, next, Object, kNextOffset)