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



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

SYNOPSIS
       c++filt [-_|--strip-underscore]
	       [-n|--no-strip-underscore]
	       [-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 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 c++filt  [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	c++filt	 and  see  the	same  source file containing demangled
       names.

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

	       c++filt <symbol>

       If  no  symbol arguments are given, c++filt 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

OPTIONS
       -_
       --strip-underscore
	   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	depen-
	   dent.

       -n
       --no-strip-underscore
	   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.

       -t
       --types
	   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".

       -i
       --no-verbose
	   Do not include implementation details (if  any)  in	the  demangled
	   output.

       -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.

       @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.

FOOTNOTES
       1.  MS-DOS  does	 not  allow "+" characters in file names, so on MS-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 Free Software Foundation, Inc.

       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".



binutils-2.17.50.0.6-26.el5	  2013-10-01			    C++FILT(1)
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