Introducing Global Environment constructor; using Global Environment as starting lexical environment.

src/libecmaoperations/ecma-lex-env.c

@@ -474,6 +474,23 @@ ecma_op_initialize_immutable_binding(ecma_object_t *lex_env_p, /**< lexical envi
   JERRY_UNREACHABLE();
 } /* ecma_op_initialize_immutable_binding */
 
+/**
+ * The Global Environment constructor.
+ *
+ * See also: ECMA-262 v5, 10.2.3
+ *
+ * @return pointer to created lexical environment
+ */
+ecma_object_t*
+ecma_op_create_global_environment( void)
+{
+  ecma_object_t *glob_obj_p = ecma_op_create_global_object();
+
+  ecma_object_t *glob_env_p = ecma_create_object_lex_env( NULL, glob_obj_p, false);
+
+  return glob_env_p;
+} /* ecma_op_create_global_environment */
+
 /**
  * @}
  * @}

src/libecmaoperations/ecma-lex-env.h

@@ -40,6 +40,8 @@ extern ecma_completion_value_t ecma_op_implicit_this_value( ecma_object_t *lex_e
 extern void ecma_op_create_immutable_binding( ecma_object_t *lex_env_p, const ecma_char_t *name_p);
 extern void ecma_op_initialize_immutable_binding( ecma_object_t *lex_env_p, const ecma_char_t *name_p, ecma_value_t value);
 
+extern ecma_object_t* ecma_op_create_global_environment( void);
+
 /**
  * @}
  * @}