C++FILT

Section: GNU Development Tools (1)
Updated: 2005-08-05
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NAME

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

SYNOPSIS

DESCRIPTION

The C++ and Java languages provides function overloading, which means that you can write many functions with the same name (providing each takes parameters of different types). All C++ and Java function names are encoded into a low-level assembly label (this process is known as mangling). The c++filt [1] 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.

OPTIONS

-_

--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.

-j

--java

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

-n

--no-strip-underscores

Do not remove the initial underscore.

-p

--no-params

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

-s format

--format=format

c++filt 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).

--help

Print a summary of the options to c++filt and exit.

--version

Print the version number of c++filt and exit.

FOOTNOTES

1.: MS-DOS does not allow "+" characters in file names, so on MS-DOS this program is named c++filt.

COPYRIGHT

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''.

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Time: 23:03:51 GMT, June 17, 2008