Fix marshalling of pg tuples.

Author: aardvark179

lib/truffle/truffle/cext.rb

@@ -620,6 +620,26 @@ def rb_obj_instance_variables(object)
     object.instance_variables
   end
 
+  def rb_copy_generic_ivar(clone, original)
+    Truffle.check_frozen(clone)
+    original_ivars = original.instance_variables
+    clone_ivars = clone.instance_variables
+    clone_ivars.each do |var|
+      clone.__send__ :remove_instance_variable, var
+    end
+    original_ivars.each do |var|
+      clone.instance_variable_set(var, original.instance_variable_get(var))
+    end
+  end
+
+  def rb_free_generic_ivar(original)
+    Truffle.check_frozen(original)
+    original_ivars = original.instance_variables
+    original_ivars.each do |var|
+      original.__send__ :remove_instance_variable, var
+    end
+  end
+
   def rb_inspect(object)
     Truffle::Type.rb_inspect(object)
   end

src/main/c/cext/ruby.c

@@ -1276,6 +1276,9 @@ int rb_tr_flags(VALUE value) {
   if (OBJ_TAINTED(value)) {
     flags |= RUBY_FL_TAINT;
   }
+  if (rb_array_len(rb_obj_instance_variables(value)) > 0) {
+    flags |= RUBY_FL_EXIVAR;
+  }
   // TODO BJF Nov-11-2017 Implement more flags
   return flags;
 }
@@ -4403,11 +4406,11 @@ void rb_alias_variable(ID name1, ID name2) {
 }
 
 void rb_copy_generic_ivar(VALUE clone, VALUE obj) {
-  rb_tr_error("rb_copy_generic_ivar not implemented");
+  RUBY_CEXT_INVOKE_NO_WRAP("rb_copy_generic_ivar", clone, obj);
 }
 
 void rb_free_generic_ivar(VALUE obj) {
-  rb_tr_error("rb_free_generic_ivar not implemented");
+  RUBY_CEXT_INVOKE_NO_WRAP("rb_free_generic_ivar", obj);
 }
 
 void rb_ivar_foreach(VALUE obj, int (*func)(ANYARGS), st_data_t arg) {