Improve new.target handling in case of eval calls (#3517)

Only direct eval calls propagate the "new.target" information.
In any other eval cases the "new.target" invocation is a syntax error.

Added test cases also.

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com

Author: galpeter

jerry-core/ecma/operations/ecma-eval.c

@@ -100,8 +100,9 @@ ecma_op_eval_chars_buffer (const lit_utf8_byte_t *code_p, /**< code characters b
 #if ENABLED (JERRY_ES2015)
   ECMA_CLEAR_SUPER_EVAL_PARSER_OPTS ();
 
-  /* If an eval is used inside the function the info should be propagated. */
-  if (JERRY_CONTEXT (current_new_target) != JERRY_CONTEXT_INVALID_NEW_TARGET)
+  /* If a direct eval is used inside the function the info should be propagated. */
+  if (JERRY_CONTEXT (current_new_target) != JERRY_CONTEXT_INVALID_NEW_TARGET
+      && (JERRY_CONTEXT (status_flags) & ECMA_STATUS_DIRECT_EVAL))
   {
     parse_opts |= ECMA_PARSE_FUNCTION;
   }

jerry-core/ecma/operations/ecma-function-object.c

@@ -1138,7 +1138,8 @@ ecma_op_function_call (ecma_object_t *func_obj_p, /**< Function object */
     {
 #if ENABLED (JERRY_ES2015)
       ecma_object_t *old_new_target = JERRY_CONTEXT (current_new_target);
-      if (JERRY_LIKELY (!ecma_get_object_is_builtin (func_obj_p)))
+      /* If the current function is not a direct eval call the "new.target" must be updated. */
+      if ((JERRY_CONTEXT (status_flags) & ECMA_STATUS_DIRECT_EVAL) == 0)
       {
         JERRY_CONTEXT (current_new_target) = NULL;
       }

tests/jerry/es2015/new-target.js

@@ -91,6 +91,30 @@ function eval_eval_test () {
 
 new eval_eval_test ();
 
+/* new.target is only valid in direct eval */
+function eval_test_2 () {
+  var ev = eval;
+  try {
+    ev ("new.target");
+    assert (false);
+  } catch (ex) {
+    assert (ex instanceof SyntaxError);
+  }
+}
+
+new eval_test_2 ();
+
+function eval_test_3 () {
+  var ev = eval;
+  try {
+    eval ("ev ('new.target')");
+    assert (false);
+  } catch (ex) {
+    assert (ex instanceof SyntaxError);
+  }
+}
+
+new eval_test_3 ();
 
 /* test assignment of the "new.target" */
 function expect_syntax_error (src)