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

lib/filterClasses.js

Index: lib/filterClasses.js
===================================================================
--- a/lib/filterClasses.js
+++ b/lib/filterClasses.js
@@ -19,16 +19,18 @@
 
 /**
  * @fileOverview Definition of Filter class and its subclasses.
  */
 
 const {filterNotifier} = require("./filterNotifier");
 const {extend} = require("./coreUtils");
 const {filterToRegExp} = require("./common");
+const {optimizeContentFilterText,
+       optimizeRegExpFilterText} = require("./filterText");
 
 /**
  * All known unique domain sources mapped to their parsed values.
  * @type {Map.<string,Map.<string,boolean>>}
  */
 let knownDomainMaps = new Map();
 
 /**
@@ -890,16 +892,22 @@
     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);
+  }
+
   try
   {
     if (blocking)
     {
       if (csp && Filter.invalidCSPRegExp.test(csp))
         return new InvalidFilter(origText, "filter_invalid_csp");
 
       return new BlockingFilter(origText, text, contentType, matchCase, domains,
@@ -1108,16 +1116,22 @@
 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);
+  }
+
   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) ||