where is c++filt source code?

Question

Does anyone known the link of c++filt source code. I want call c++filt in my code as a library.

Answer 1

On Linux you can use /usr/include/demangle.h which comes with binutils-dev package. You'll have to link to the libiberty from binutils.

Answer 2

it's part of binutils:

http://ftp.gnu.org/gnu/binutils/

Answer 3

Given different compilers can mangle differently, each tends to ship with a custom c++filt. But, most systems will already have a demangling library function available somewhere. On my Linux box I found /usr/include/c++/version/cxxabi.h header defining __cxa_demangle() (see http://gcc.gnu.org/onlinedocs/libstdc++/manual/ext_demangling.html). I thought I'd used some other function in the past though, but can't find the details (EDIT: probably the demangle version İsmail documents). On AIX there's a demangle.h.

EDIT: on most systems with pstack and c++filt programs (i.e. Linux and Solaris), the following should work...

#include <cstdio>
#include <iostream>
#include <sstream>

struct X
{
    void f()
    {
        std::ostringstream cmd;
        cmd << "pstack " << getpid() << " | c++filt";
        if (FILE* f = popen(cmd.str().c_str(), "r"))
        {
            char buffer[1024];
            int n;
            while ((n = fread(buffer, 1, sizeof buffer, f)) > 0)
                std::cout.write(buffer, n);
        }
        else
            std::cerr << "popen() failed\n";
    }
};

int main()
{
    X x;
    x.f();
}

...output...

#0  0x003539be in __read_nocancel () from /lib/tls/i686/libc.so.6
#1  0x002ff590 in _IO_file_read_internal () from /lib/tls/i686/libc.so.6
#2  0x002fe522 in _IO_new_file_underflow () from /lib/tls/i686/libc.so.6
#3  0x00300371 in __underflow () from /lib/tls/i686/libc.so.6
#4  0x0030079d in _IO_default_xsgetn_internal () from /lib/tls/i686/libc.so.6
#5  0x00300733 in _IO_sgetn_internal () from /lib/tls/i686/libc.so.6
#6  0x002f666c in fread () from /lib/tls/i686/libc.so.6
#7  0x08048c36 in X::f ()
#8  0x08048ac0 in main ()

Notice that __read_nocancel etc are NOT C++-mangled identifiers: they're just internal C function names, using the reserved-for-implementation leading-underscore-and-uppercase-letter or leading-double-underscore convensions.

X::f() was a mangled identifier and has been demangled.