c++filt [ -_ | --strip-underscores
]
[ -n | --no-strip-underscores
]
[ -sformat | --format=format
]
[ --help ] [ --version
] [ symbol...]
The C++ language provides function overloading, which means that you can write many functions with the same name (providing each takes parameters of different types). All C++ function names are encoded into a low-level assembly label (this process is known as mangling). The c++filt program does the inverse mapping: it decodes (demangles) low-level names into user-level names so that the linker can keep these overloaded functions from clashing.
Every alphanumeric word (consisting of letters, digits, underscores, dollars, or periods) seen in the input is a potential label. If the label decodes into a C++ name, the C++ name replaces the low-level name in the output.
You can use c++filt to decipher individual symbols:
c++filt symbol
If no symbol arguments are given, c++filt reads symbol names from the standard input and writes the demangled names to the standard output. All results are printed on the standard output.
-_
--strip-underscores
On some systems, both the C and C++ compilers put an underscore in front
of every name. For example, the C name foo
gets the low-level name _foo.
This option removes the initial underscore. Whether c++filt
removes the underscore by default is target dependent.
-n
--no-strip-underscores
Do not remove the initial underscore.
-s
format
--format=format
GNU nm
can decode three different methods of mangling, used by different C++ compilers.
The argument to this option selects which method it uses:
gnu
The one used by
the GNU compiler (the default method).
lucid
The one used by
the Lucid compiler.
arm
The one specified
by the C++ Annotated Reference Manual.
--help
Print a summary of the options to c++filt
and exit.
--version
Print the version number of c++filt
and exit.
Warning:
c++filt
is a new utility, and the details of its user interface are subject to
change in future releases. In particular, a command-line option may be
required in the future to decode a name passed as an argument on the command
line; for example, c++filt
symbol
may in a future release become c++filt
option symbol.