Mark generator as running during yield* (#5014)

Fixes #5013

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

Author: zherczeg

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

@@ -677,7 +677,9 @@ ecma_gc_mark_executable_object (ecma_object_t *object_p) /**< object */
   ecma_gc_set_object_visited (executable_object_p->frame_ctx.lex_env_p);
   ecma_gc_set_object_visited (executable_object_p->shared.function_object_p);
 
-  if (!ECMA_EXECUTABLE_OBJECT_IS_SUSPENDED (executable_object_p))
+  if (!ECMA_EXECUTABLE_OBJECT_IS_SUSPENDED (executable_object_p)
+      && !(executable_object_p->extended_object.u.cls.u2.executable_obj_flags
+           & ECMA_EXECUTABLE_OBJECT_DO_AWAIT_OR_YIELD))
   {
     /* All objects referenced by running executable objects are strong roots,
      * and a finished executable object cannot refer to other values. */

jerry-core/ecma/builtin-objects/ecma-builtin-generator-prototype.c

@@ -91,12 +91,20 @@ ecma_builtin_generator_prototype_object_do (vm_executable_object_t *generator_ob
   {
     if (generator_object_p->extended_object.u.cls.u2.executable_obj_flags & ECMA_EXECUTABLE_OBJECT_DO_AWAIT_OR_YIELD)
     {
+      if (generator_object_p->extended_object.u.cls.u2.executable_obj_flags & ECMA_EXECUTABLE_OBJECT_RUNNING)
+      {
+        return ecma_raise_type_error (ECMA_ERR_GENERATOR_IS_CURRENTLY_UNDER_EXECUTION);
+      }
+
       ecma_value_t iterator = generator_object_p->iterator;
       ecma_value_t next_method = generator_object_p->frame_ctx.stack_top_p[-1];
 
       bool done = false;
+
+      generator_object_p->extended_object.u.cls.u2.executable_obj_flags |= ECMA_EXECUTABLE_OBJECT_RUNNING;
       ecma_value_t result = ecma_op_iterator_do (resume_mode, iterator, next_method, arg, &done);
       ecma_free_value (arg);
+      generator_object_p->extended_object.u.cls.u2.executable_obj_flags &= (uint8_t) ~ECMA_EXECUTABLE_OBJECT_RUNNING;
 
       if (ECMA_IS_VALUE_ERROR (result))
       {

tests/jerry/regression-test-issue-5013.js

@@ -0,0 +1,30 @@
+// 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.
+
+function foo() {
+    var a;
+    function* bar() {
+        try {
+            yield* b;
+        } catch (e) {
+            a = e;
+        }
+    }
+    var b = bar();
+    b.next();
+
+    return a;
+}
+
+foo();