Calling a generator function returns a generator object

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 5bb1ee49d3f27873ee40741d1f32979607e1f4f2..801fcde79cfce1445757fdc426b83f4f9f8297f9 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -4333,6 +4333,22 @@ MaybeObject* Heap::AllocateJSObjectWithAllocationSite(JSFunction* constructor,
 }
 
 
+MaybeObject* Heap::AllocateJSGeneratorIterator(JSFunction *function) {
+  ASSERT(function->shared()->is_generator());
+  Map *map = function->initial_map();
+  ASSERT(map->IsMap());
+  ASSERT(map->instance_type() == JS_GENERATOR_ITERATOR_TYPE);
+  JSGeneratorIterator *generator;
+  MaybeObject* maybe_generator = AllocateJSObjectFromMap(map, NOT_TENURED);
+  if (!maybe_generator->To(&generator)) return maybe_generator;
+  generator->set_function(function);
+  generator->set_context(Smi::FromInt(0));
+  generator->set_continuation(0);
+  generator->set_operand_stack(Smi::FromInt(0));
+  return generator;
+}
+
+
 MaybeObject* Heap::AllocateJSModule(Context* context, ScopeInfo* scope_info) {
   // Allocate a fresh map. Modules do not have a prototype.
   Map* map;