Issue 5063 - [emscripten] Make FilterNotifier calls more efficient

compiled/FilterNotifier.cpp

Index: compiled/FilterNotifier.cpp
===================================================================
new file mode 100644
--- /dev/null
+++ b/compiled/FilterNotifier.cpp
@@ -0,0 +1,99 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2017 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <emscripten.h>
+
+#include "FilterNotifier.h"
+
+namespace
+{
+  enum class ArgType
+  {
+    BOOL = 0,
+    INT = 1,
+    DOUBLE = 2,
+    STRING = 3,
+  };
+
+  template<typename T>
+  void NotifyPropertyChange(FilterNotifier::Topic topic, void* object,
+      T newValue, T oldValue, ArgType type)
+  {
+    EM_ASM_ARGS({
+      var topic = notifierTopics.get($0);
+      var object = topic.startsWith("subscription.") ?
+          exports.Subscription.fromPointer($1) :
+          exports.Filter.fromPointer($1);
+      var newValue;
+      var oldValue;
+      if ($4 == 0)
+      {
+        newValue = $2 != 0;
+        oldValue = $3 != 0;
+      }
+      else if ($4 == 3)
+      {
+        newValue = readString($2);
+        oldValue = readString($3);
+      }
+      else
+      {
+        newValue = $2;
+        oldValue = $3;
+      }
+      FilterNotifier.triggerListeners(topic, object, newValue, oldValue);
+    }, topic, object, newValue, oldValue, type);
+  }
+
+  template void NotifyPropertyChange<int>(FilterNotifier::Topic, void*,
+      int, int, ArgType);
+
+  template void NotifyPropertyChange<double>(FilterNotifier::Topic, void*,
+      double, double, ArgType);
+}
+
+namespace FilterNotifier
+{
+  void PropertyChange(Topic topic, void* object, bool newValue, bool oldValue)
+  {
+    NotifyPropertyChange<int>(topic, object, newValue, oldValue, ArgType::BOOL);
+  }
+
+  void PropertyChange(Topic topic, void* object, int newValue, int oldValue)
+  {
+    NotifyPropertyChange<int>(topic, object, newValue, oldValue, ArgType::INT);
+  }
+
+  void PropertyChange(Topic topic, void* object, unsigned int newValue,
+      unsigned int oldValue)
+  {
+    NotifyPropertyChange<int>(topic, object, newValue, oldValue, ArgType::INT);
+  }
+
+  void PropertyChange(Topic topic, void* object, double newValue, double oldValue)
+  {
+    NotifyPropertyChange<double>(topic, object, newValue, oldValue,
+                                 ArgType::DOUBLE);
+  }
+
+  void PropertyChange(Topic topic, void* object, const String& newValue,
+      const String& oldValue)
+  {
+    NotifyPropertyChange<int>(topic, object, reinterpret_cast<int>(&newValue),
+                              reinterpret_cast<int>(&oldValue), ArgType::STRING);
+  }
+}