ExternalObject constructor not called

[federico.terraneo@…]

Trying to instantiate an ExternalObject with omc nightly builds results in the constructor not being called, only the destructor.

Please see the attached testcase, to be run with

omc +s ExtObj.mo
make -f Test.makefile
./Test

The result I'm seeing is this:

Dtor called (obj=(nil))
Test: ./ExtObj.h:22: void dtor(void *): Assertion `obj==(void*)0xdeadbeef' failed.
Aborted (core dumped)

It looks like the constructor is not called. A look at the C sources generated by omc resulted in this (Test_01exo.c):

/* Has to be performed after _init.xml file has been read */
void Test_callExternalObjectConstructors(DATA *data)
{
  /* data->simulationInfo.extObjs = NULL; */
  infoStreamPrint(LOG_DEBUG, 0, "call external Object Constructors");
  infoStreamPrint(LOG_DEBUG, 0, "call external Object Constructors finished");
}

void Test_callExternalObjectDestructors(DATA *data)
{
  if(data->simulationInfo.extObjs)
  {
    omc_NativeInterface_destructor(threadData,$Piface);
    free(data->simulationInfo.extObjs);
    data->simulationInfo.extObjs = 0;
  }
}

So the destructor is called, the constructor is not.

[federico.terraneo@…]

Testcase that triggers the bug

[Martin Sjölund]

model Test
  NativeInterface iface(param = "test parameter");
end Test;

Is not how you call the constructor. You should use:

model Test
  NativeInterface iface = NativeInterface(param = "test parameter");
end Test;

Full file example because omc does not support external objects as a top-level class:

package P

class NativeInterface
  extends ExternalObject;

function constructor
  input String param;
  output NativeInterface interface;

  external "C" interface = ctor(param) annotation(Include = "#include \"ExtObj.h\"");
end constructor;

function destructor
  input NativeInterface interface;

  external "C" dtor(interface) annotation(Include = "#include \"ExtObj.h\"");
end destructor;
end NativeInterface;

end P;

model Test
  import P.NativeInterface;
  parameter NativeInterface iface = NativeInterface(param = "test parameter");
end Test;