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Diffstat (limited to 'common/kernel/handle_error.cc')
| -rw-r--r-- | common/kernel/handle_error.cc | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/common/kernel/handle_error.cc b/common/kernel/handle_error.cc new file mode 100644 index 00000000..d5542369 --- /dev/null +++ b/common/kernel/handle_error.cc @@ -0,0 +1,61 @@ +#ifndef NO_PYTHON + +#include <Python.h> +#include <pybind11/pybind11.h> +#include "nextpnr.h" + +namespace py = pybind11; + +NEXTPNR_NAMESPACE_BEGIN + +// Parses the value of the active python exception +// NOTE SHOULD NOT BE CALLED IF NO EXCEPTION +std::string parse_python_exception() +{ + PyObject *type_ptr = NULL, *value_ptr = NULL, *traceback_ptr = NULL; + // Fetch the exception info from the Python C API + PyErr_Fetch(&type_ptr, &value_ptr, &traceback_ptr); + + // Fallback error + std::string ret("Unfetchable Python error"); + // If the fetch got a type pointer, parse the type into the exception string + if (type_ptr != NULL) { + py::object obj = py::reinterpret_borrow<py::object>(type_ptr); + // If a valid string extraction is available, use it + // otherwise use fallback + if (py::isinstance<py::str>(obj)) + ret = obj.cast<std::string>(); + else + ret = "Unknown exception type"; + } + // Do the same for the exception value (the stringification of the + // exception) + if (value_ptr != NULL) { + py::object obj = py::reinterpret_borrow<py::object>(value_ptr); + if (py::isinstance<py::str>(obj)) + ret += ": " + obj.cast<std::string>(); + else + ret += std::string(": Unparseable Python error: "); + } + // Parse lines from the traceback using the Python traceback module + if (traceback_ptr != NULL) { + py::handle h_tb(traceback_ptr); + // Load the traceback module and the format_tb function + py::object tb(py::module::import("traceback")); + py::object fmt_tb(tb.attr("format_tb")); + // Call format_tb to get a list of traceback strings + py::object tb_list(fmt_tb(h_tb)); + // Join the traceback strings into a single string + py::object tb_str(py::str("\n") + tb_list); + // Extract the string, check the extraction, and fallback in necessary + if (py::isinstance<py::str>(tb_str)) + ret += ": " + tb_str.cast<std::string>(); + else + ret += std::string(": Unparseable Python traceback"); + } + return ret; +} + +NEXTPNR_NAMESPACE_END + +#endif // NO_PYTHON
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