Implement yield* operation in generator functions. (#3407)

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/ecma/base/ecma-gc.c

@@ -377,6 +377,12 @@ ecma_gc_mark_executable_object (ecma_object_t *object_p) /**< object */
     return;
   }
 
+  if (executable_object_p->extended_object.u.class_prop.extra_info & ECMA_GENERATOR_ITERATE_AND_YIELD)
+  {
+    ecma_value_t iterator = executable_object_p->extended_object.u.class_prop.u.value;
+    ecma_gc_set_object_visited (ecma_get_object_from_value (iterator));
+  }
+
   ecma_gc_set_object_visited (executable_object_p->frame_ctx.lex_env_p);
 
   if (ecma_is_value_object (executable_object_p->frame_ctx.this_binding))

jerry-core/ecma/base/ecma-globals.h

@@ -1761,6 +1761,8 @@ typedef enum
 {
   ECMA_EXECUTABLE_OBJECT_COMPLETED = (1u << 0), /**< executable object is completed and cannot be resumed */
   ECMA_EXECUTABLE_OBJECT_RUNNING = (1u << 1), /**< executable object is currently running */
+  /* Generator specific flags. */
+  ECMA_GENERATOR_ITERATE_AND_YIELD = (1u << 2), /**< the generator performs a yield* operation */
 } ecma_executable_object_flags_t;
 
 /**