Manual Pages for UNIX Darwin command on man c++filt

C++FILT(1) GNU Development Tools C++FILT(1)

NAME

c++filt - Demangle C++ and Java symbols.

SYNOPSIS

c++filt [-|--ssttrriipp-uunnddeerrssccoorreess]

[-nn|--nnoo-ssttrriipp-uunnddeerrssccoorreess]

[-pp|--nnoo-ppaarraammss]

[-tt|--ttyyppeess]

[-ii|--nnoo-vveerrbboossee]

[-ss format|--ffoorrmmaatt==format]

[--hheellpp] [--vveerrssiioonn] [symbol...]

DESCRIPTION

The C++ and Java languages provide function overloading, which means that you can write many functions with the same name, providing that each function takes parameters of different types. In order to be able to distinguish these similarly named functions C++ and Java encode them

into a low-level assembler name which uniquely identifies each differ-

ent version. This process is known as mangling. The cc++++ffiilltt [1] pro-

gram does the inverse mapping: it decodes (demangles) low-level names

into user-level names so that they can be read.

Every alphanumeric word (consisting of letters, digits, underscores, dollars, or periods) seen in the input is a potential mangled name. If

the name decodes into a C++ name, the C++ name replaces the low-level

name in the output, otherwise the original word is output. In this way you can pass an entire assembler source file, containing mangled names, through cc++++ffiilltt and see the same source file containing demangled names. You can also use cc++++ffiilltt to decipher individual symbols by passing them on the command line:

c++filt

If no symbol arguments are given, cc++++ffiilltt reads symbol names from the standard input instead. All the results are printed on the standard output. The difference between reading names from the command line

versus reading names from the standard input is that command line argu-

ments are expected to be just mangled names and no checking is per-

formed to separate them from surrounding text. Thus for example:

c++filt -n Z1fv

will work and demangle the name to "f()" whereas:

c++filt -n Z1fv,

will not work. (Note the extra comma at the end of the mangled name which makes it invalid). This command however will work:

echo Z1fv, | c++filt -n

and will display "f()," ie the demangled name followed by a trailing comma. This behaviour is because when the names are read from the standard input it is expected that they might be part of an assembler source file where there might be extra, extraneous characters trailing after a mangled name. eg: .type Z1fv, @function OOPPTTIIOONNSS

--ssttrriipp-uunnddeerrssccoorreess

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 cc++++ffiilltt removes the underscore by default is target depen-

dent.

-jj

--jjaavvaa

Prints demangled names using Java syntax. The default is to use C++ syntax.

-nn

--nnoo-ssttrriipp-uunnddeerrssccoorreess

Do not remove the initial underscore.

-pp

--nnoo-ppaarraammss

When demangling the name of a function, do not display the types of the function's parameters.

-tt

--ttyyppeess

Attempt to demangle types as well as function names. This is dis-

abled by default since mangled types are normally only used inter-

nally in the compiler, and they can be confused with non-mangled

names. eg a function called "a" treated as a mangled type name would be demangled to "signed char".

-ii

--nnoo-vveerrbboossee

Do not include implementation details (if any) in the demangled output.

-ss format

--ffoorrmmaatt==format

cc++++ffiilltt can decode various methods of mangling, used by different compilers. The argument to this option selects which method it uses: "auto" Automatic selection based on executable (the default method) "gnu" the one used by the GNU C++ compiler (g++) "lucid" the one used by the Lucid compiler (lcc) "arm" the one specified by the C++ Annotated Reference Manual "hp" the one used by the HP compiler (aCC) "edg" the one used by the EDG compiler

"gnu-v3"

the one used by the GNU C++ compiler (g++) with the V3 ABI. "java" the one used by the GNU Java compiler (gcj) "gnat" the one used by the GNU Ada compiler (GNAT).

--hheellpp

Print a summary of the options to cc++++ffiilltt and exit.

--vveerrssiioonn

Print the version number of cc++++ffiilltt and exit. @@file

Read command-line options from file. The options read are inserted

in place of the original @file option. If file does not exist, or cannot be read, then the option will be treated literally, and not removed.

Options in file are separated by whitespace. A whitespace charac-

ter may be included in an option by surrounding the entire option in either single or double quotes. Any character (including a backslash) may be included by prefixing the character to be included with a backslash. The file may itself contain additional @file options; any such options will be processed recursively. FFOOOOTTNNOOTTEESS

1. MS-DOS does not allow "+" characters in file names, so on MS-DOS

this program is named CCXXXXFFIILLTT.