Method field

Tools/gdb/libpython.py:184–208

Get the gdb.Value for the given field within the PyObject. Various libpython types are defined using the "PyObject_HEAD" and "PyObject_VAR_HEAD" macros. In Python, this is defined as an embedded PyVarObject type thus: PyVarObject ob_base; so that

(self, name)

            self._gdbval = gdbval

    def field(self, name):
        '''
        Get the gdb.Value for the given field within the PyObject.

        Various libpython types are defined using the "PyObject_HEAD" and
        "PyObject_VAR_HEAD" macros.

        In Python, this is defined as an embedded PyVarObject type thus:
           PyVarObject ob_base;
        so that the "ob_size" field is located insize the "ob_base" field, and
        the "ob_type" is most easily accessed by casting back to a (PyObject*).
        '''
        if self.is_null():
            raise NullPyObjectPtr(self)

        if name == 'ob_type':
            pyo_ptr = self._gdbval.cast(PyObjectPtr.get_gdb_type())
            return pyo_ptr.dereference()[name]

        if name == 'ob_size':
            pyo_ptr = self._gdbval.cast(PyVarObjectPtr.get_gdb_type())
            return pyo_ptr.dereference()[name]

        # General case: look it up inside the object:
        return self._gdbval.dereference()[name]

    def pyop_field(self, name):
        '''