binutils/cxxfilt.c

   1 /* Demangler for GNU C++ - main program
   2    Copyright (C) 1989-2020 Free Software Foundation, Inc.
   3    Written by James Clark (jjc@jclark.uucp)
   4    Rewritten by Fred Fish (fnf@cygnus.com) for ARM and Lucid demangling
   5    Modified by Satish Pai (pai@apollo.hp.com) for HP demangling
   6
   7    This file is part of GNU Binutils.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or (at
  12    your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GCC; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 #include "sysdep.h"
  25 #include "bfd.h"
  26 #include "libiberty.h"
  27 #include "demangle.h"
  28 #include "getopt.h"
  29 #include "safe-ctype.h"
  30 #include "bucomm.h"
  31
  32 static int flags = DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE;
  33 static int strip_underscore = TARGET_PREPENDS_UNDERSCORE;
  34
  35 static const struct option long_options[] =
  36 {
  37   {"strip-underscore", no_argument, NULL, '_'},
  38   {"format", required_argument, NULL, 's'},
  39   {"help", no_argument, NULL, 'h'},
  40   {"no-params", no_argument, NULL, 'p'},
  41   {"no-strip-underscores", no_argument, NULL, 'n'},
  42   {"no-verbose", no_argument, NULL, 'i'},
  43   {"types", no_argument, NULL, 't'},
  44   {"version", no_argument, NULL, 'v'},
  45   {"recurse-limit", no_argument, NULL, 'R'},
  46   {"recursion-limit", no_argument, NULL, 'R'},
  47   {"no-recurse-limit", no_argument, NULL, 'r'},
  48   {"no-recursion-limit", no_argument, NULL, 'r'},
  49   {NULL, no_argument, NULL, 0}
  50 };
  51
  52 static void
  53 demangle_it (char *mangled_name)
  54 {
  55   char *result;
  56   unsigned int skip_first = 0;
  57
  58   /* _ and $ are sometimes found at the start of function names
  59      in assembler sources in order to distinguish them from other
  60      names (eg register names).  So skip them here.  */
  61   if (mangled_name[0] == '.' || mangled_name[0] == '$')
  62     ++skip_first;
  63   if (strip_underscore && mangled_name[skip_first] == '_')
  64     ++skip_first;
  65
  66   result = cplus_demangle (mangled_name + skip_first, flags);
  67
  68   if (result == NULL)
  69     printf ("%s", mangled_name);
  70   else
  71     {
  72       if (mangled_name[0] == '.')
  73         putchar ('.');
  74       printf ("%s", result);
  75       free (result);
  76     }
  77 }
  78
  79 static void
  80 print_demangler_list (FILE *stream)
  81 {
  82   const struct demangler_engine *demangler;
  83
  84   fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name);
  85
  86   for (demangler = libiberty_demanglers + 1;
  87        demangler->demangling_style != unknown_demangling;
  88        ++demangler)
  89     fprintf (stream, ",%s", demangler->demangling_style_name);
  90
  91   fprintf (stream, "}");
  92 }
  93
  94 ATTRIBUTE_NORETURN static void
  95 usage (FILE *stream, int status)
  96 {
  97   fprintf (stream, "\
  98 Usage: %s [options] [mangled names]\n", program_name);
  99   fprintf (stream, "\
 100 Options are:\n\
 101   [-_|--strip-underscore]     Ignore first leading underscore%s\n",
 102            TARGET_PREPENDS_UNDERSCORE ? " (default)" : "");
 103   fprintf (stream, "\
 104   [-n|--no-strip-underscore]  Do not ignore a leading underscore%s\n",
 105            TARGET_PREPENDS_UNDERSCORE ? "" : " (default)");
 106   fprintf (stream, "\
 107   [-p|--no-params]            Do not display function arguments\n\
 108   [-i|--no-verbose]           Do not show implementation details (if any)\n\
 109   [-R|--recurse-limit]        Enable a limit on recursion whilst demangling.  [Default]\n\
 110   ]-r|--no-recurse-limit]     Disable a limit on recursion whilst demangling\n\
 111   [-t|--types]                Also attempt to demangle type encodings\n\
 112   [-s|--format ");
 113   print_demangler_list (stream);
 114   fprintf (stream, "]\n");
 115
 116   fprintf (stream, "\
 117   [@<file>]                   Read extra options from <file>\n\
 118   [-h|--help]                 Display this information\n\
 119   [-v|--version]              Show the version information\n\
 120 Demangled names are displayed to stdout.\n\
 121 If a name cannot be demangled it is just echoed to stdout.\n\
 122 If no names are provided on the command line, stdin is read.\n");
 123   if (REPORT_BUGS_TO[0] && status == 0)
 124     fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO);
 125   exit (status);
 126 }
 127
 128 /* Return the string of non-alnum characters that may occur
 129    as a valid symbol component, in the standard assembler symbol
 130    syntax.  */
 131
 132 static const char *
 133 standard_symbol_characters (void)
 134 {
 135   return "_$.";
 136 }
 137
 138 extern int main (int, char **);
 139
 140 int
 141 main (int argc, char **argv)
 142 {
 143   int c;
 144   const char *valid_symbols;
 145   enum demangling_styles style = auto_demangling;
 146
 147   program_name = argv[0];
 148   xmalloc_set_program_name (program_name);
 149   bfd_set_error_program_name (program_name);
 150
 151   expandargv (&argc, &argv);
 152
 153   while ((c = getopt_long (argc, argv, "_hinprRs:tv", long_options, (int *) 0)) != EOF)
 154     {
 155       switch (c)
 156         {
 157         case '?':
 158           usage (stderr, 1);
 159           break;
 160         case 'h':
 161           usage (stdout, 0);
 162         case 'n':
 163           strip_underscore = 0;
 164           break;
 165         case 'p':
 166           flags &= ~ DMGL_PARAMS;
 167           break;
 168         case 'r':
 169           flags |= DMGL_NO_RECURSE_LIMIT;
 170           break;
 171         case 'R':
 172           flags &= ~ DMGL_NO_RECURSE_LIMIT;
 173           break;
 174         case 't':
 175           flags |= DMGL_TYPES;
 176           break;
 177         case 'i':
 178           flags &= ~ DMGL_VERBOSE;
 179           break;
 180         case 'v':
 181           print_version ("c++filt");
 182           return 0;
 183         case '_':
 184           strip_underscore = 1;
 185           break;
 186         case 's':
 187           style = cplus_demangle_name_to_style (optarg);
 188           if (style == unknown_demangling)
 189             {
 190               fprintf (stderr, "%s: unknown demangling style `%s'\n",
 191                        program_name, optarg);
 192               return 1;
 193             }
 194           cplus_demangle_set_style (style);
 195           break;
 196         }
 197     }
 198
 199   if (optind < argc)
 200     {
 201       for ( ; optind < argc; optind++)
 202         {
 203           demangle_it (argv[optind]);
 204           putchar ('\n');
 205         }
 206
 207       return 0;
 208     }
 209
 210   switch (current_demangling_style)
 211     {
 212     case auto_demangling:
 213     case gnu_v3_demangling:
 214     case java_demangling:
 215     case gnat_demangling:
 216     case dlang_demangling:
 217     case rust_demangling:
 218        valid_symbols = standard_symbol_characters ();
 219       break;
 220     default:
 221       /* Folks should explicitly indicate the appropriate alphabet for
 222          each demangling.  Providing a default would allow the
 223          question to go unconsidered.  */
 224       fatal ("Internal error: no symbol alphabet for current style");
 225     }
 226
 227   for (;;)
 228     {
 229       static char mbuffer[32767];
 230       unsigned i = 0;
 231
 232       c = getchar ();
 233       /* Try to read a mangled name.  */
 234       while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
 235         {
 236           if (i >= sizeof (mbuffer) - 1)
 237             break;
 238           mbuffer[i++] = c;
 239           c = getchar ();
 240         }
 241
 242       if (i > 0)
 243         {
 244           mbuffer[i] = 0;
 245           demangle_it (mbuffer);
 246         }
 247
 248       if (c == EOF)
 249         break;
 250
 251       /* Echo the whitespace characters so that the output looks
 252          like the input, only with the mangled names demangled.  */
 253       putchar (c);
 254       if (c == '\n')
 255         fflush (stdout);
 256     }
 257
 258   fflush (stdout);
 259   return 0;
 260 }