Fix error handling in scanner when in case of OOM

This patch fixes jerryscript-project#3786 and fixes jerryscript-project#3788.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik [email protected]

Author: rerobika

jerry-core/parser/js/js-scanner-internal.h

@@ -358,6 +358,7 @@ scanner_info_t *scanner_insert_info_before (parser_context_t *context_p, const u
                                             scanner_info_t *start_info_p, size_t size);
 scanner_literal_pool_t *scanner_push_literal_pool (parser_context_t *context_p, scanner_context_t *scanner_context_p,
                                                    uint16_t status_flags);
+void scanner_release_active_literal_pool (scanner_context_t *scanner_context_p);
 void scanner_pop_literal_pool (parser_context_t *context_p, scanner_context_t *scanner_context_p);
 #if ENABLED (JERRY_ES2015)
 void scanner_construct_global_block (parser_context_t *context_p, scanner_context_t *scanner_context_p);

jerry-core/parser/js/js-scanner-util.c

@@ -463,6 +463,23 @@ scanner_literal_is_arguments (lexer_lit_location_t *literal_p) /**< literal */
   return lexer_compare_identifier_to_string (literal_p, (const uint8_t *) "arguments", 9);
 } /* scanner_literal_is_arguments */
 
+/**
+ * Release the active literal pool
+ */
+void
+scanner_release_active_literal_pool (scanner_context_t *scanner_context_p) /**< scanner context */
+{
+  while (scanner_context_p->active_literal_pool_p != NULL)
+  {
+    scanner_literal_pool_t *literal_pool_p = scanner_context_p->active_literal_pool_p;
+
+    scanner_context_p->active_literal_pool_p = literal_pool_p->prev_p;
+
+    parser_list_free (&literal_pool_p->literal_pool);
+    scanner_free (literal_pool_p, sizeof (scanner_literal_pool_t));
+  }
+} /* scanner_release_active_literal_pool */
+
 /**
  * Pop the last literal pool from the end.
  */

jerry-core/parser/js/js-scanner.c

@@ -3159,19 +3159,23 @@ scanner_scan_all (parser_context_t *context_p, /**< context */
   }
   PARSER_CATCH
   {
-    /* Ignore the errors thrown by the lexer. */
-    if (context_p->error != PARSER_ERR_OUT_OF_MEMORY)
-    {
-      context_p->error = PARSER_ERR_NO_ERROR;
-    }
-
 #if ENABLED (JERRY_ES2015)
     while (scanner_context.active_binding_list_p != NULL)
     {
       scanner_pop_binding_list (&scanner_context);
     }
 #endif /* ENABLED (JERRY_ES2015) */
 
+    if (JERRY_UNLIKELY (context_p->error == PARSER_ERR_OUT_OF_MEMORY))
+    {
+      scanner_release_active_literal_pool (&scanner_context);
+      parser_stack_free (context_p);
+      return;
+    }
+
+    /* Ignore the errors thrown by the lexer. */
+    context_p->error = PARSER_ERR_NO_ERROR;
+
     /* The following code may allocate memory, so it is enclosed in a try/catch. */
     PARSER_TRY (context_p->try_buffer)
     {
@@ -3193,17 +3197,16 @@ scanner_scan_all (parser_context_t *context_p, /**< context */
     }
     PARSER_CATCH
     {
-      JERRY_ASSERT (context_p->error == PARSER_ERR_NO_ERROR);
+      JERRY_ASSERT (context_p->error == PARSER_ERR_NO_ERROR || context_p->error == PARSER_ERR_OUT_OF_MEMORY);
 
-      while (scanner_context.active_literal_pool_p != NULL)
-      {
-        scanner_literal_pool_t *literal_pool_p = scanner_context.active_literal_pool_p;
+      scanner_release_active_literal_pool (&scanner_context);
 
-        scanner_context.active_literal_pool_p = literal_pool_p->prev_p;
-
-        parser_list_free (&literal_pool_p->literal_pool);
-        scanner_free (literal_pool_p, sizeof (scanner_literal_pool_t));
+      if (JERRY_UNLIKELY (context_p->error == PARSER_ERR_OUT_OF_MEMORY))
+      {
+        parser_stack_free (context_p);
+        return;
       }
+
     }
     PARSER_TRY_END