[experiment] Issue 7045 - Optimize V8 memory layout of filter text

lib/filterClasses.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 879 matching lines @@
   if (rewrite != null)
   {
     if (contentType == null)
       ({contentType} = RegExpFilter.prototype);
     contentType &= ~(RegExpFilter.typeMap.SCRIPT |
                      RegExpFilter.typeMap.SUBDOCUMENT |
                      RegExpFilter.typeMap.OBJECT |
                      RegExpFilter.typeMap.OBJECT_SUBREQUEST);
   }
 
-  if (domains)
-  {
-    [origText, text, domains, sitekeys, csp, rewrite] =
-      optimizeRegExpFilterText(origText, text, domains, sitekeys, csp, rewrite);
-  }
+  [origText, text, domains, sitekeys, csp, rewrite] =
+    optimizeRegExpFilterText(origText, text, domains, sitekeys, csp, rewrite);
 
   try
   {
     if (blocking)
     {
       if (csp && Filter.invalidCSPRegExp.test(csp))
         return new InvalidFilter(origText, "filter_invalid_csp");
 
       return new BlockingFilter(origText, text, contentType, matchCase, domains,
                                 thirdParty, sitekeys, collapse, csp, rewrite);
@@ skipping 199 matching lines @@
  *          ElemHideEmulationFilter|SnippetFilter|InvalidFilter}
  */
 ContentFilter.fromText = function(text, domains, type, body)
 {
   // We don't allow content filters which have any empty domains.
   // Note: The ContentFilter.prototype.domainSeparator is duplicated here, if
   // that changes this must be changed too.
   if (domains && /(^|,)~?(,|$)/.test(domains))
     return new InvalidFilter(text, "filter_invalid_domain");
 
-  if (domains)
-  {
-    [text, domains, type, body] =
-      optimizeContentFilterText(text, domains, type, body);
-  }
+  [text, domains, type, body] =
+    optimizeContentFilterText(text, domains, type, body);
 
   if (type == "@")
     return new ElemHideException(text, domains, body);
 
   if (type == "?" || type == "$")
   {
     // Element hiding emulation and snippet filters are inefficient so we need
     // to make sure that they're only applied if they specify active domains
     if (!(/,[^~][^,.]*\.[^,]/.test("," + domains) ||
           ("," + domains + ",").includes(",localhost,")))
@@ skipping 112 matching lines @@
 
   /**
    * Script that should be executed
    * @type {string}
    */
   get script()
   {
     return this.body;
   }
 });