Support passing of objects to functions

src/V3Width.cpp

@@ -1789,6 +1789,7 @@ private:
             }
         } else if (nodep->isIO()
                    && !(VN_IS(nodep->dtypeSkipRefp(), BasicDType)
+                        || VN_IS(nodep->dtypeSkipRefp(), ClassRefDType)
                         || VN_IS(nodep->dtypeSkipRefp(), NodeArrayDType)
                         || VN_IS(nodep->dtypeSkipRefp(), NodeUOrStructDType))) {
             nodep->v3warn(E_UNSUPPORTED,

test_regress/t/t_class_new.v

@@ -19,6 +19,11 @@ class ClsArg;
    function int geta;
       return imembera;
    endfunction
+   static function ClsArg create6;
+      ClsArg obj;
+      obj = new(6 - 1);
+      return obj;
+   endfunction
 endclass
 
 module t (/*AUTOARG*/);
@@ -33,6 +38,10 @@ module t (/*AUTOARG*/);
       if (c2.imembera != 3) $stop;
       if (c2.geta() != 3) $stop;
 
+      c2 = ClsArg::create6();
+      if (c2.imembera != 6) $stop;
+      if (c2.geta() != 6) $stop;
+
       $write("*-* All Finished *-*\n");
       $finish;
    end

test_regress/t/t_class_static_method.v

@@ -16,17 +16,34 @@ class Cls;
       if (x != 23) $stop;
       return 42;
    endfunction
-
 endclass : Cls
 
+class OCls;
+   int i;
+   static function OCls create();
+      OCls o = new;
+      o.i = 42;
+      return o;
+   endfunction
+   static task test_obj(OCls o);
+      if (o.i != 42) $stop;
+   endtask
+endclass
+
 module t (/*AUTOARG*/);
 
    initial begin
       int x;
+      OCls oc;
+
       Cls::static_task(16);
       x = Cls::static_function(23);
       $write("Static function result: %d\n", x);
       if (x != 42) $stop;
+
+      oc = OCls::create();
+      OCls::test_obj(oc);
+
       $write("*-* All Finished *-*\n");
       $finish;
    end