#1211 Memory leak after exception

[Anonymous]

If a function throws an exception, any applicable 'freearg' typemaps are not executed and leaks may occur.

%typemap(in) Data*
{
$1 = new Data($input)
}

%typemap(freearg) Data*
{
delete $1;
}

class Data
{
// something
};

class Foo
{
public:
void Bar(Data* data) throw (Exception);
};

[Olly Betts]

Seems to have been fixed since. With SWIG 4.0.2 and Python I get:

SWIGINTERN PyObject *_wrap_Foo_Bar(PyObject *self, PyObject *args) {
  PyObject *resultobj = 0;
  Foo *arg1 = (Foo *) 0 ;
  Data *arg2 = (Data *) 0 ;
  void *argp1 = 0 ;
  int res1 = 0 ;
  PyObject *swig_obj[2] ;

  if (!SWIG_Python_UnpackTuple(args, "Foo_Bar", 2, 2, swig_obj)) SWIG_fail;
  res1 = SWIG_ConvertPtr(swig_obj[0], &argp1,SWIGTYPE_p_Foo, 0 |  0 );
  if (!SWIG_IsOK(res1)) {
    SWIG_exception_fail(SWIG_ArgError(res1), "in method '" "Foo_Bar" "', argument " "1"" of type '" "Foo *""'");
  }
  arg1 = reinterpret_cast< Foo * >(argp1);
  {
    arg2 = new Data(swig_obj[1])
  }
  try {
    (arg1)->Bar(arg2);
  } catch(Exception &_e) {
    SWIG_Python_Raise(SWIG_NewPointerObj((new Exception(static_cast< const Exception& >(_e))),SWIGTYPE_p_Exception,SWIG_POINTER_OWN), "Exception", SWIGTYPE_p_Exception); SWIG_fail;
  }
  resultobj = SWIG_Py_Void();
  {
    delete arg2;
  }
  return resultobj;
fail:
  {
    delete arg2;
  }
  return NULL;
}

[Olly Betts]

However ... PHP had issues. I've pushed a fix to git master which will be in SWIG 4.1.0.