Don`t use references to JsEngine to avoid use-after-free errors,switch to shared_ptr instead

src/FilterEngine.cpp

Index: src/FilterEngine.cpp
===================================================================
--- a/src/FilterEngine.cpp
+++ b/src/FilterEngine.cpp
@@ -140,30 +140,30 @@ bool Filter::IsListed()
   for (std::vector<FilterPtr>::iterator it = filterEngine.listedFilters.begin();
        it != filterEngine.listedFilters.end(); ++it)
   {
     if (it->get() == this)
       return true;
   }
   return false;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.isListedFilter");
+  JsValuePtr func = jsEngine->Evaluate("API.isListedFilter");
   JsValueList params;
   params.push_back(shared_from_this());
   return func->Call(params)->AsBool();
 #endif
 }
 
 void Filter::AddToList()
 {
 #if FILTER_ENGINE_STUBS
   if (!IsListed())
     filterEngine.listedFilters.push_back(shared_from_this());
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.addFilterToList");
+  JsValuePtr func = jsEngine->Evaluate("API.addFilterToList");
   JsValueList params;
   params.push_back(shared_from_this());
   func->Call(params);
 #endif
 }
 
 void Filter::RemoveFromList()
 {
@@ -172,17 +172,17 @@ void Filter::RemoveFromList()
        it != filterEngine.listedFilters.end();)
   {
     if (it->get() == this)
       it = filterEngine.listedFilters.erase(it);
     else
       it++;
   }
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.removeFilterFromList");
+  JsValuePtr func = jsEngine->Evaluate("API.removeFilterFromList");
   JsValueList params;
   params.push_back(shared_from_this());
   func->Call(params);
 #endif
 }
 
 bool Filter::operator==(const Filter& filter) const
 {
@@ -208,30 +208,30 @@ bool Subscription::IsListed()
   for (std::vector<SubscriptionPtr>::iterator it = filterEngine.listedSubscriptions.begin();
        it != filterEngine.listedSubscriptions.end(); ++it)
   {
     if (it->get() == this)
       return true;
   }
   return false;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.isListedFilter");
+  JsValuePtr func = jsEngine->Evaluate("API.isListedFilter");
   JsValueList params;
   params.push_back(shared_from_this());
   return func->Call(params)->AsBool();
 #endif
 }
 
 void Subscription::AddToList()
 {
 #if FILTER_ENGINE_STUBS
   if (!IsListed())
     filterEngine.listedSubscriptions.push_back(shared_from_this());
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.addSubscriptionToList");
+  JsValuePtr func = jsEngine->Evaluate("API.addSubscriptionToList");
   JsValueList params;
   params.push_back(shared_from_this());
   func->Call(params);
 #endif
 }
 
 void Subscription::RemoveFromList()
 {
@@ -240,56 +240,56 @@ void Subscription::RemoveFromList()
        it != filterEngine.listedSubscriptions.end();)
   {
     if (it->get() == this)
       it = filterEngine.listedSubscriptions.erase(it);
     else
       it++;
   }
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.removeSubscriptionFromList");
+  JsValuePtr func = jsEngine->Evaluate("API.removeSubscriptionFromList");
   JsValueList params;
   params.push_back(shared_from_this());
   func->Call(params);
 #endif
 }
 
 void Subscription::UpdateFilters()
 {
 #if !FILTER_ENGINE_STUBS
-  JsValuePtr func = jsEngine.Evaluate("API.updateSubscription");
+  JsValuePtr func = jsEngine->Evaluate("API.updateSubscription");
   JsValueList params;
   params.push_back(shared_from_this());
   func->Call(params);
 #endif
 }
 
 bool Subscription::IsUpdating()
 {
 #if FILTER_ENGINE_STUBS
   return false;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.isSubscriptionUpdating");
+  JsValuePtr func = jsEngine->Evaluate("API.isSubscriptionUpdating");
   JsValueList params;
   params.push_back(shared_from_this());
   JsValuePtr result = func->Call(params);
   return result->AsBool();
 #endif
 }
 
 bool Subscription::operator==(const Subscription& subscription) const
 {
   return GetProperty("url", "") == subscription.GetProperty("url", "");
 }
 
-FilterEngine::FilterEngine(JsEngine& jsEngine) : jsEngine(jsEngine)
+FilterEngine::FilterEngine(JsEnginePtr jsEngine) : jsEngine(jsEngine)
 {
 #if !FILTER_ENGINE_STUBS
   for (int i = 0; jsSources[i] && jsSources[i + 1]; i += 2)
-    jsEngine.Evaluate(jsSources[i + 1], jsSources[i]);
+    jsEngine->Evaluate(jsSources[i + 1], jsSources[i]);
 #endif
 }
 
 FilterPtr FilterEngine::GetFilter(const std::string& text)
 {
 #if FILTER_ENGINE_STUBS
   // Via http://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
   std::string trimmed(text);
@@ -299,61 +299,61 @@ FilterPtr FilterEngine::GetFilter(const 
   std::map<std::string, FilterPtr>::const_iterator it = knownFilters.find(trimmed);
   if (it != knownFilters.end())
     return it->second;
 
   FilterPtr result(new Filter(*this, trimmed));
   knownFilters[trimmed] = result;
   return result;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.getFilterFromText");
+  JsValuePtr func = jsEngine->Evaluate("API.getFilterFromText");
   JsValueList params;
-  params.push_back(jsEngine.NewValue(text));
+  params.push_back(jsEngine->NewValue(text));
   return FilterPtr(new Filter(func->Call(params)));
 #endif
 }
 
 SubscriptionPtr FilterEngine::GetSubscription(const std::string& url)
 {
 #if FILTER_ENGINE_STUBS
   std::map<std::string, SubscriptionPtr>::const_iterator it = knownSubscriptions.find(url);
   if (it != knownSubscriptions.end())
     return it->second;
 
   SubscriptionPtr result(new Subscription(*this, url));
   knownSubscriptions[url] = result;
   return result;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.getSubscriptionFromUrl");
+  JsValuePtr func = jsEngine->Evaluate("API.getSubscriptionFromUrl");
   JsValueList params;
-  params.push_back(jsEngine.NewValue(url));
+  params.push_back(jsEngine->NewValue(url));
   return SubscriptionPtr(new Subscription(func->Call(params)));
 #endif
 }
 
 const std::vector<FilterPtr> FilterEngine::GetListedFilters() const
 {
 #if FILTER_ENGINE_STUBS
   return listedFilters;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.getListedFilters");
+  JsValuePtr func = jsEngine->Evaluate("API.getListedFilters");
   JsValueList values = func->Call()->AsList();
   std::vector<FilterPtr> result;
   for (JsValueList::iterator it = values.begin(); it != values.end(); it++)
     result.push_back(FilterPtr(new Filter(*it)));
   return result;
 #endif
 }
 
 const std::vector<SubscriptionPtr> FilterEngine::GetListedSubscriptions() const
 {
 #if FILTER_ENGINE_STUBS
   return listedSubscriptions;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.getListedSubscriptions");
+  JsValuePtr func = jsEngine->Evaluate("API.getListedSubscriptions");
   JsValueList values = func->Call()->AsList();
   std::vector<SubscriptionPtr> result;
   for (JsValueList::iterator it = values.begin(); it != values.end(); it++)
     result.push_back(SubscriptionPtr(new Subscription(*it)));
   return result;
 #endif
 }
 
@@ -384,21 +384,21 @@ AdblockPlus::FilterPtr FilterEngine::Mat
   //For test on http://simple-adblock.com/faq/testing-your-adblocker/
   if (url.find("adbanner.gif") != std::string::npos)
     return GetFilter("adbanner.gif");
   else if (url.find("notbanner.gif") != std::string::npos)
     return GetFilter("@@notbanner.gif");
   else
     return AdblockPlus::FilterPtr();
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.checkFilterMatch");
+  JsValuePtr func = jsEngine->Evaluate("API.checkFilterMatch");
   JsValueList params;
-  params.push_back(jsEngine.NewValue(url));
-  params.push_back(jsEngine.NewValue(contentType));
-  params.push_back(jsEngine.NewValue(documentUrl));
+  params.push_back(jsEngine->NewValue(url));
+  params.push_back(jsEngine->NewValue(contentType));
+  params.push_back(jsEngine->NewValue(documentUrl));
   JsValuePtr result = func->Call(params);
   if (!result->IsNull())
     return FilterPtr(new Filter(result));
   else
     return FilterPtr();
 #endif
 }
 
@@ -408,18 +408,18 @@ std::vector<std::string> FilterEngine::G
   std::vector<std::string> selectors;
   selectors.push_back("#ad");
   selectors.push_back(".ad");
   //For test on http://simple-adblock.com/faq/testing-your-adblocker/
   if (domain == "simple-adblock.com")
     selectors.push_back(".ad_300x250");
   return selectors;
 #else
-  JsValuePtr func = jsEngine.Evaluate("API.getElementHidingSelectors");
+  JsValuePtr func = jsEngine->Evaluate("API.getElementHidingSelectors");
   JsValueList params;
-  params.push_back(jsEngine.NewValue(domain));
+  params.push_back(jsEngine->NewValue(domain));
   JsValueList result = func->Call(params)->AsList();
   std::vector<std::string> selectors;
   for (JsValueList::iterator it = result.begin(); it != result.end(); ++it)
     selectors.push_back((*it)->AsString());
   return selectors;
 #endif
 }