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MAN page from RedHat EL 6 toolchain-armiwmmx-2012-2012.12.1-oselas.2.2.x86_64.rpm

C++FILT

Section: GNU Development Tools (1)
Updated: 2017-09-21
Index 

NAME

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

SYNOPSIS

c++filt [-_|--strip-underscores]
        [-n|--no-strip-underscores]
        [-p|--no-params]
        [-t|--types]
        [-i|--no-verbose]
        [-s format|--format=format]
        [--help]  [--version]  [symbol...] 

DESCRIPTION

The C++ and Java languages provide function overloading, which meansthat you can write many functions with the same name, providing thateach function takes parameters of different types. In order to beable to distinguish these similarly named functions C++ and Javaencode them into a low-level assembler name which uniquely identifieseach different version. This process is known as mangling. Thec++filt[1]program does the inverse mapping: it decodes (demangles) low-levelnames 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 thelow-level name in the output, otherwise the original word is output.In this way you can pass an entire assembler source file, containingmangled names, through c++filt and see the same source filecontaining demangled names.

You can also use c++filt to decipher individual symbols bypassing them on the command line:

        c++filt <symbol>

If no symbol arguments are given, c++filt reads symbolnames from the standard input instead. All the results are printed onthe standard output. The difference between reading names from thecommand line versus reading names from the standard input is thatcommand line arguments are expected to be just mangled names and nochecking is performed to separate them from surrounding text. Thusfor 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 mangledname which makes it invalid). This command however will work:

        echo _Z1fv, | c++filt -n

and will display ``f(),'', i.e., the demangled name followed by atrailing comma. This behaviour is because when the names are readfrom the standard input it is expected that they might be part of anassembler source file where there might be extra, extraneouscharacters trailing after a mangled name. For example:

            .type   _Z1fv, @function
 

OPTIONS

-_
--strip-underscores
On some systems, both the C and C++ compilers put an underscore in frontof every name. For example, the C name "foo" gets the low-levelname "_foo". This option removes the initial underscore. Whetherc++filt removes the underscore by default is target dependent.
-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 ofthe function's parameters.
-t
--types
Attempt to demangle types as well as function names. This is disabledby default since mangled types are normally only used internally inthe compiler, and they can be confused with non-mangled names. For example,a function called ``a'' treated as a mangled type name would bedemangled to ``signed char''.
-i
--no-verbose
Do not include implementation details (if any) in the demangledoutput.
-s format
--format=format
c++filt can decode various methods of mangling, used bydifferent compilers. The argument to this option selects whichmethod 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.
@file
Read command-line options from file. The options read areinserted in place of the original @file option. If filedoes not exist, or cannot be read, then the option will be treatedliterally, and not removed.

Options in file are separated by whitespace. A whitespacecharacter may be included in an option by surrounding the entireoption in either single or double quotes. Any character (including abackslash) may be included by prefixing the character to be includedwith a backslash. The file may itself contain additional@file options; any such options will be processed recursively.

 

FOOTNOTES

1.
MS-DOS does not allow "+" characters in file names, so onMS-DOS this program is named CXXFILT.
 

SEE ALSO

the Info entries for binutils. 

COPYRIGHT

Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.3or any later version published by the Free Software Foundation;with no Invariant Sections, with no Front-Cover Texts, and with noBack-Cover Texts. A copy of the license is included in thesection entitled ``GNU Free Documentation License''.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
FOOTNOTES
SEE ALSO
COPYRIGHT

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