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/* Demangler for GNU C++ - main program

   Copyright 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999,

   2000, 2001, 2002, 2003, 2005, 2007 Free Software Foundation, Inc.

   Written by James Clark (jjc@jclark.uucp)

   Rewritten by Fred Fish (fnf@cygnus.com) for ARM and Lucid demangling

   Modified by Satish Pai (pai@apollo.hp.com) 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

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   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] == '$')

    ++skip_first;

  if (strip_underscore && mangled_name[skip_first] == '_')

    ++skip_first;

  result = cplus_demangle (mangled_name + skip_first, flags);

  if (result == NULL)

    printf ("%s", mangled_name);

  else

    {

      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;

       ++demangler)

    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:

        typeid*__XT24AddressIndExpClassMember_

        [Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv

        __ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv

   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 <srikanth@cup.hp.com>, 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 **);

int

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);

  expandargv (&argc, &argv);

  while ((c = getopt_long (argc, argv, "_hinps:tv", long_options, (int *) 0)) != EOF)

    {

      switch (c)

        {

        case '?':

          usage (stderr, 1);

          break;

        case 'h':

          usage (stdout, 0);

        case 'n':

          strip_underscore = 0;

          break;

        case 'p':

          flags &= ~ DMGL_PARAMS;

          break;

        case 't':

          flags |= DMGL_TYPES;

          break;

        case 'i':

          flags &= ~ DMGL_VERBOSE;

          break;

        case 'v':

          print_version ("c++filt");

          return 0;

        case '_':

          strip_underscore = 1;

          break;

        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);

          break;

        }

    }

  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 auto_demangling:

      valid_symbols = standard_symbol_characters ();

      break;

    case hp_demangling:

      valid_symbols = hp_symbol_characters ();

      break;

    default:

      /* 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)

            break;

          mbuffer[i++] = c;

          c = getchar ();

        }

      if (i > 0)

        {

          mbuffer[i] = 0;

          demangle_it (mbuffer);

        }

      if (c == EOF)

        break;

      /* 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;

}