blob: 5a3b3340687feebe72f2c3a6098ce222327b73cc [file] [log] [blame]
/* Demangler for GNU C++ - main program
Copyright (C) 1989-2016 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.uucp)
Rewritten by Fred Fish ( for ARM and Lucid demangling
Modified by Satish Pai ( for HP demangling
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libiberty.h"
#include "demangle.h"
#include "getopt.h"
#include "safe-ctype.h"
#include "bucomm.h"
static int flags = DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE;
static int strip_underscore = TARGET_PREPENDS_UNDERSCORE;
static const struct option long_options[] =
{"strip-underscore", no_argument, NULL, '_'},
{"format", required_argument, NULL, 's'},
{"help", no_argument, NULL, 'h'},
{"no-params", no_argument, NULL, 'p'},
{"no-strip-underscores", no_argument, NULL, 'n'},
{"no-verbose", no_argument, NULL, 'i'},
{"types", no_argument, NULL, 't'},
{"version", no_argument, NULL, 'v'},
{NULL, no_argument, NULL, 0}
static void
demangle_it (char *mangled_name)
char *result;
unsigned int skip_first = 0;
/* _ and $ are sometimes found at the start of function names
in assembler sources in order to distinguish them from other
names (eg register names). So skip them here. */
if (mangled_name[0] == '.' || mangled_name[0] == '$')
if (strip_underscore && mangled_name[skip_first] == '_')
result = cplus_demangle (mangled_name + skip_first, flags);
if (result == NULL)
printf ("%s", mangled_name);
if (mangled_name[0] == '.')
putchar ('.');
printf ("%s", result);
free (result);
static void
print_demangler_list (FILE *stream)
const struct demangler_engine *demangler;
fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name);
for (demangler = libiberty_demanglers + 1;
demangler->demangling_style != unknown_demangling;
fprintf (stream, ",%s", demangler->demangling_style_name);
fprintf (stream, "}");
static void
usage (FILE *stream, int status)
fprintf (stream, "\
Usage: %s [options] [mangled names]\n", program_name);
fprintf (stream, "\
Options are:\n\
[-_|--strip-underscore] Ignore first leading underscore%s\n",
TARGET_PREPENDS_UNDERSCORE ? " (default)" : "");
fprintf (stream, "\
[-n|--no-strip-underscore] Do not ignore a leading underscore%s\n",
TARGET_PREPENDS_UNDERSCORE ? "" : " (default)");
fprintf (stream, "\
[-p|--no-params] Do not display function arguments\n\
[-i|--no-verbose] Do not show implementation details (if any)\n\
[-t|--types] Also attempt to demangle type encodings\n\
[-s|--format ");
print_demangler_list (stream);
fprintf (stream, "]\n");
fprintf (stream, "\
[@<file>] Read extra options from <file>\n\
[-h|--help] Display this information\n\
[-v|--version] Show the version information\n\
Demangled names are displayed to stdout.\n\
If a name cannot be demangled it is just echoed to stdout.\n\
If no names are provided on the command line, stdin is read.\n");
if (REPORT_BUGS_TO[0] && status == 0)
fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO);
exit (status);
/* Return the string of non-alnum characters that may occur
as a valid symbol component, in the standard assembler symbol
syntax. */
static const char *
standard_symbol_characters (void)
return "_$.";
/* Return the string of non-alnum characters that may occur
as a valid symbol name component in an HP object file.
Note that, since HP's compiler generates object code straight from
C++ source, without going through an assembler, its mangled
identifiers can use all sorts of characters that no assembler would
tolerate, so the alphabet this function creates is a little odd.
Here are some sample mangled identifiers offered by HP:
This still seems really weird to me, since nowhere else in this
file is there anything to recognize curly brackets, parens, etc.
I've talked with Srikanth <>, and he assures me
this is right, but I still strongly suspect that there's a
misunderstanding here.
If we decide it's better for c++filt to use HP's assembler syntax
to scrape identifiers out of its input, here's the definition of
the symbol name syntax from the HP assembler manual:
Symbols are composed of uppercase and lowercase letters, decimal
digits, dollar symbol, period (.), ampersand (&), pound sign(#) and
underscore (_). A symbol can begin with a letter, digit underscore or
dollar sign. If a symbol begins with a digit, it must contain a
non-digit character.
So have fun. */
static const char *
hp_symbol_characters (void)
return "_$.<>#,*&[]:(){}";
extern int main (int, char **);
main (int argc, char **argv)
int c;
const char *valid_symbols;
enum demangling_styles style = auto_demangling;
program_name = argv[0];
xmalloc_set_program_name (program_name);
bfd_set_error_program_name (program_name);
expandargv (&argc, &argv);
while ((c = getopt_long (argc, argv, "_hinps:tv", long_options, (int *) 0)) != EOF)
switch (c)
case '?':
usage (stderr, 1);
case 'h':
usage (stdout, 0);
case 'n':
strip_underscore = 0;
case 'p':
flags &= ~ DMGL_PARAMS;
case 't':
flags |= DMGL_TYPES;
case 'i':
flags &= ~ DMGL_VERBOSE;
case 'v':
print_version ("c++filt");
return 0;
case '_':
strip_underscore = 1;
case 's':
style = cplus_demangle_name_to_style (optarg);
if (style == unknown_demangling)
fprintf (stderr, "%s: unknown demangling style `%s'\n",
program_name, optarg);
return 1;
cplus_demangle_set_style (style);
if (optind < argc)
for ( ; optind < argc; optind++)
demangle_it (argv[optind]);
putchar ('\n');
return 0;
switch (current_demangling_style)
case gnu_demangling:
case lucid_demangling:
case arm_demangling:
case java_demangling:
case edg_demangling:
case gnat_demangling:
case gnu_v3_demangling:
case dlang_demangling:
case auto_demangling:
valid_symbols = standard_symbol_characters ();
case hp_demangling:
valid_symbols = hp_symbol_characters ();
/* Folks should explicitly indicate the appropriate alphabet for
each demangling. Providing a default would allow the
question to go unconsidered. */
fatal ("Internal error: no symbol alphabet for current style");
for (;;)
static char mbuffer[32767];
unsigned i = 0;
c = getchar ();
/* Try to read a mangled name. */
while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
if (i >= sizeof (mbuffer) - 1)
mbuffer[i++] = c;
c = getchar ();
if (i > 0)
mbuffer[i] = 0;
demangle_it (mbuffer);
if (c == EOF)
/* Echo the whitespace characters so that the output looks
like the input, only with the mangled names demangled. */
putchar (c);
if (c == '\n')
fflush (stdout);
fflush (stdout);
return 0;