binutils/cxxfilt.c

   1 /* Demangler for GNU C++ - main program
   2    Copyright (C) 1989-2017 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   {NULL, no_argument, NULL, 0}
  46 };
  47
  48 static void
  49 demangle_it (char *mangled_name)
  50 {
  51   char *result;
  52   unsigned int skip_first = 0;
  53
  54   /* _ and $ are sometimes found at the start of function names
  55      in assembler sources in order to distinguish them from other
  56      names (eg register names).  So skip them here.  */
  57   if (mangled_name[0] == '.' || mangled_name[0] == '$')
  58     ++skip_first;
  59   if (strip_underscore && mangled_name[skip_first] == '_')
  60     ++skip_first;
  61
  62   result = cplus_demangle (mangled_name + skip_first, flags);
  63
  64   if (result == NULL)
  65     printf ("%s", mangled_name);
  66   else
  67     {
  68       if (mangled_name[0] == '.')
  69         putchar ('.');
  70       printf ("%s", result);
  71       free (result);
  72     }
  73 }
  74
  75 static void
  76 print_demangler_list (FILE *stream)
  77 {
  78   const struct demangler_engine *demangler;
  79
  80   fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name);
  81
  82   for (demangler = libiberty_demanglers + 1;
  83        demangler->demangling_style != unknown_demangling;
  84        ++demangler)
  85     fprintf (stream, ",%s", demangler->demangling_style_name);
  86
  87   fprintf (stream, "}");
  88 }
  89
  90 ATTRIBUTE_NORETURN static void
  91 usage (FILE *stream, int status)
  92 {
  93   fprintf (stream, "\
  94 Usage: %s [options] [mangled names]\n", program_name);
  95   fprintf (stream, "\
  96 Options are:\n\
  97   [-_|--strip-underscore]     Ignore first leading underscore%s\n",
  98            TARGET_PREPENDS_UNDERSCORE ? " (default)" : "");
  99   fprintf (stream, "\
 100   [-n|--no-strip-underscore]  Do not ignore a leading underscore%s\n",
 101            TARGET_PREPENDS_UNDERSCORE ? "" : " (default)");
 102   fprintf (stream, "\
 103   [-p|--no-params]            Do not display function arguments\n\
 104   [-i|--no-verbose]           Do not show implementation details (if any)\n\
 105   [-t|--types]                Also attempt to demangle type encodings\n\
 106   [-s|--format ");
 107   print_demangler_list (stream);
 108   fprintf (stream, "]\n");
 109
 110   fprintf (stream, "\
 111   [@<file>]                   Read extra options from <file>\n\
 112   [-h|--help]                 Display this information\n\
 113   [-v|--version]              Show the version information\n\
 114 Demangled names are displayed to stdout.\n\
 115 If a name cannot be demangled it is just echoed to stdout.\n\
 116 If no names are provided on the command line, stdin is read.\n");
 117   if (REPORT_BUGS_TO[0] && status == 0)
 118     fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO);
 119   exit (status);
 120 }
 121
 122 /* Return the string of non-alnum characters that may occur
 123    as a valid symbol component, in the standard assembler symbol
 124    syntax.  */
 125
 126 static const char *
 127 standard_symbol_characters (void)
 128 {
 129   return "_$.";
 130 }
 131
 132 /* Return the string of non-alnum characters that may occur
 133    as a valid symbol name component in an HP object file.
 134
 135    Note that, since HP's compiler generates object code straight from
 136    C++ source, without going through an assembler, its mangled
 137    identifiers can use all sorts of characters that no assembler would
 138    tolerate, so the alphabet this function creates is a little odd.
 139    Here are some sample mangled identifiers offered by HP:
 140
 141         typeid*__XT24AddressIndExpClassMember_
 142         [Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv
 143         __ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv
 144
 145    This still seems really weird to me, since nowhere else in this
 146    file is there anything to recognize curly brackets, parens, etc.
 147    I've talked with Srikanth <srikanth@cup.hp.com>, and he assures me
 148    this is right, but I still strongly suspect that there's a
 149    misunderstanding here.
 150
 151    If we decide it's better for c++filt to use HP's assembler syntax
 152    to scrape identifiers out of its input, here's the definition of
 153    the symbol name syntax from the HP assembler manual:
 154
 155        Symbols are composed of uppercase and lowercase letters, decimal
 156        digits, dollar symbol, period (.), ampersand (&), pound sign(#) and
 157        underscore (_). A symbol can begin with a letter, digit underscore or
 158        dollar sign. If a symbol begins with a digit, it must contain a
 159        non-digit character.
 160
 161    So have fun.  */
 162 static const char *
 163 hp_symbol_characters (void)
 164 {
 165   return "_$.<>#,*&[]:(){}";
 166 }
 167
 168 extern int main (int, char **);
 169
 170 int
 171 main (int argc, char **argv)
 172 {
 173   int c;
 174   const char *valid_symbols;
 175   enum demangling_styles style = auto_demangling;
 176
 177   program_name = argv[0];
 178   xmalloc_set_program_name (program_name);
 179   bfd_set_error_program_name (program_name);
 180
 181   expandargv (&argc, &argv);
 182
 183   while ((c = getopt_long (argc, argv, "_hinps:tv", long_options, (int *) 0)) != EOF)
 184     {
 185       switch (c)
 186         {
 187         case '?':
 188           usage (stderr, 1);
 189           break;
 190         case 'h':
 191           usage (stdout, 0);
 192         case 'n':
 193           strip_underscore = 0;
 194           break;
 195         case 'p':
 196           flags &= ~ DMGL_PARAMS;
 197           break;
 198         case 't':
 199           flags |= DMGL_TYPES;
 200           break;
 201         case 'i':
 202           flags &= ~ DMGL_VERBOSE;
 203           break;
 204         case 'v':
 205           print_version ("c++filt");
 206           return 0;
 207         case '_':
 208           strip_underscore = 1;
 209           break;
 210         case 's':
 211           style = cplus_demangle_name_to_style (optarg);
 212           if (style == unknown_demangling)
 213             {
 214               fprintf (stderr, "%s: unknown demangling style `%s'\n",
 215                        program_name, optarg);
 216               return 1;
 217             }
 218           cplus_demangle_set_style (style);
 219           break;
 220         }
 221     }
 222
 223   if (optind < argc)
 224     {
 225       for ( ; optind < argc; optind++)
 226         {
 227           demangle_it (argv[optind]);
 228           putchar ('\n');
 229         }
 230
 231       return 0;
 232     }
 233
 234   switch (current_demangling_style)
 235     {
 236     case gnu_demangling:
 237     case lucid_demangling:
 238     case arm_demangling:
 239     case java_demangling:
 240     case edg_demangling:
 241     case gnat_demangling:
 242     case gnu_v3_demangling:
 243     case dlang_demangling:
 244     case rust_demangling:
 245     case auto_demangling:
 246       valid_symbols = standard_symbol_characters ();
 247       break;
 248     case hp_demangling:
 249       valid_symbols = hp_symbol_characters ();
 250       break;
 251     default:
 252       /* Folks should explicitly indicate the appropriate alphabet for
 253          each demangling.  Providing a default would allow the
 254          question to go unconsidered.  */
 255       fatal ("Internal error: no symbol alphabet for current style");
 256     }
 257
 258   for (;;)
 259     {
 260       static char mbuffer[32767];
 261       unsigned i = 0;
 262
 263       c = getchar ();
 264       /* Try to read a mangled name.  */
 265       while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
 266         {
 267           if (i >= sizeof (mbuffer) - 1)
 268             break;
 269           mbuffer[i++] = c;
 270           c = getchar ();
 271         }
 272
 273       if (i > 0)
 274         {
 275           mbuffer[i] = 0;
 276           demangle_it (mbuffer);
 277         }
 278
 279       if (c == EOF)
 280         break;
 281
 282       /* Echo the whitespace characters so that the output looks
 283          like the input, only with the mangled names demangled.  */
 284       putchar (c);
 285       if (c == '\n')
 286         fflush (stdout);
 287     }
 288
 289   fflush (stdout);
 290   return 0;
 291 }