Exceptions

Handling exceptions from Python in SystemVerilog

When SystemVerilog calls Python functions, such as in a callback function or when manipulating Python objects, and Python raises an Exception, PyStim converts the Python exception into a SystemVerilog error of type pystim_pkg::py_error whose payload contains a SV string textual summary and the actual Python exception. To get textual summary of the Python exception, use the to_string() method of the pystim_pkg::py_error object.

Exception raised in Python	Thrown as SV error type
Any Python Exception	pystim_pkg::py_error

For example:

begin
    // open("missing.txt", "r")
    py_object file = py_module::import_("io").attr("open").call(py::str_("missing.txt"), py::str_("r"));
    py_object text;
    if(file.is_ok())begin
        text = file.attr("read").call();
        void ' (file.attr("close").call());
        text.delete();
        file.delete();
    end else begin
        // Handle the exception
        // FileNotFoundError: [Errno 2] No such file or directory: 'missing.txt'
        $display("Error: %s", file.to_string());
    end
end