Allow redefining global variables as imports (#5023)

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

jerry-core/api/jerry-module.c

@@ -13,14 +13,14 @@
  * limitations under the License.
  */
 
-#include "lit-magic-strings.h"
-#include "lit-strings.h"
-
 #include "jerryscript-core.h"
 #include "jerryscript-port.h"
 
 #include "ecma-errors.h"
 
+#include "lit-magic-strings.h"
+#include "lit-strings.h"
+
 #if JERRY_MODULE_SYSTEM
 
 /**

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

@@ -932,38 +932,17 @@ ecma_module_connect_imports (ecma_module_t *module_p)
   {
     ecma_module_names_t *import_names_p = import_node_p->module_names_p;
 
+    JERRY_ASSERT (local_env_p->type_flags_refs & ECMA_OBJECT_FLAG_BLOCK);
+
     while (import_names_p != NULL)
     {
-      ecma_object_t *lex_env_p = local_env_p;
+      ecma_property_t *binding_p = ecma_find_named_property (local_env_p, import_names_p->local_name_p);
-      ecma_property_t *binding_p = NULL;
-
-      if (lex_env_p->type_flags_refs & ECMA_OBJECT_FLAG_BLOCK)
-      {
-        binding_p = ecma_find_named_property (lex_env_p, import_names_p->local_name_p);
-
-        JERRY_ASSERT (lex_env_p->u2.outer_reference_cp != JMEM_CP_NULL);
-        lex_env_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, lex_env_p->u2.outer_reference_cp);
-      }
 
       if (binding_p != NULL)
       {
         return ecma_raise_syntax_error (ECMA_ERR_IMPORTED_BINDING_SHADOWS_LOCAL_VARIABLE);
       }
 
-      ecma_value_t status = ecma_op_has_binding (lex_env_p, import_names_p->local_name_p);
-
-#if JERRY_BUILTIN_PROXY
-      if (ECMA_IS_VALUE_ERROR (status))
-      {
-        return status;
-      }
-#endif /* JERRY_BUILTIN_PROXY */
-
-      if (ecma_is_value_true (status))
-      {
-        return ecma_raise_syntax_error (ECMA_ERR_IMPORTED_BINDING_SHADOWS_LOCAL_VARIABLE);
-      }
-
       import_names_p = import_names_p->next_p;
     }
 

tests/jerry/module-import-global.mjs

@@ -0,0 +1,23 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import JSON, { counter as Object } from 'module-export-default-1.mjs'
+
+// Overwriting globals.
+assert(typeof JSON === "function")
+assert(Object === 1.1)
+
+// Globals are still available.
+assert(typeof globalThis.JSON === "object")
+assert(typeof globalThis.Object === "function")

tests/snapshot-tests-skiplist.txt

@@ -43,6 +43,7 @@ tests/jerry/module-import-04.mjs
 tests/jerry/module-import-05.mjs
 tests/jerry/module-import-06.mjs
 tests/jerry/module-import-07.mjs
+tests/jerry/module-import-global.mjs
 tests/jerry/module-namespace-01.mjs
 tests/jerry/module-namespace-02.mjs
 tests/jerry/module-namespace-03.mjs