UnnamedFunction
The label assigned to functions that cannot be identified, owing to insufficient information in the debug data. An offset is appended to the label that represents the relative virtual address of the function from the start of the original module to its occurrence. For example, UnnamedFunction@0x124d.
This label is used when there is a function entry but no symbol name. For example, you statically linked a library without symbols and the real function name cannot be found.
By default, the UnnamedFunction* filter is used to hide these functions.
(C) Copyright IBM Corporation 1993, 2009.