[cppia] Infer overrides from matching method name

For haxe versions that do not tag overridden methods in
__scriptableFunctions tables, we can infer overrides at runtime by
comparing method names.

Author: tobil4sk

src/hx/cppia/Cppia.h

@@ -575,6 +575,9 @@ struct CppiaVar
 
 
 
+#if (HXCPP_API_LEVEL >= 500)
+# define NATIVE_CLASS_OVERRIDES_MARKED
+#endif
 
 class HaxeNativeClass
 {
@@ -596,6 +599,10 @@ class HaxeNativeClass
    static HaxeNativeClass *findClass(const std::string &inName);
    static HaxeNativeClass *hxObject();
    static void link();
+#ifndef NATIVE_CLASS_OVERRIDES_MARKED
+private:
+   void addVtableEntries( std::vector<std::string> &outVtable, hx::UnorderedSet<std::string> &outMethodsSet);
+#endif
 };
 
 class HaxeNativeInterface

src/hx/cppia/HaxeNative.cpp

@@ -30,20 +30,36 @@ HaxeNativeClass::HaxeNativeClass(const std::string &inName, int inDataOffset, Sc
    haxeSuper = 0;
 }
 
+#ifdef NATIVE_CLASS_OVERRIDES_MARKED
 void HaxeNativeClass::addVtableEntries( std::vector<std::string> &outVtable)
 {
    if (haxeSuper)
       haxeSuper->addVtableEntries(outVtable);
 
    if (functions)
       for(ScriptNamedFunction *func = functions; func->name; func++)
-#if (HXCPP_API_LEVEL >= 500)
          if (!func->isStatic && !func->isOverride)
-#else
-         if (!func->isStatic)
-#endif
             outVtable.push_back( func->name );
 }
+#else
+void HaxeNativeClass::addVtableEntries(std::vector<std::string>& outVtable) {
+   hx::UnorderedSet<std::string> methodsSet;
+   addVtableEntries(outVtable, methodsSet);
+}
+
+void HaxeNativeClass::addVtableEntries( std::vector<std::string> &outVtable,  hx::UnorderedSet<std::string>& outMethodsSet)
+{
+   if (haxeSuper)
+      haxeSuper->addVtableEntries(outVtable, outMethodsSet);
+
+   if (functions)
+      for (ScriptNamedFunction* func = functions; func->name; func++)
+         if (!func->isStatic && outMethodsSet.find(func->name) == outMethodsSet.end()) {
+            outVtable.push_back(func->name);
+            outMethodsSet.emplace(func->name);
+         }
+}
+#endif
 
 void HaxeNativeClass::dump()
 {