binutils/cxxfilt.c

   1 /* Demangler for GNU C++ - main program
   2    Copyright 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999,
   3    2000, 2001, 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
   4    Written by James Clark (jjc@jclark.uucp)
   5    Rewritten by Fred Fish (fnf@cygnus.com) for ARM and Lucid demangling
   6    Modified by Satish Pai (pai@apollo.hp.com) for HP demangling
   7
   8    This file is part of GNU Binutils.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with GCC; see the file COPYING.  If not, write to the Free
  22    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  23    02110-1301, USA.  */
  24
  25 #include "sysdep.h"
  26 #include "bfd.h"
  27 #include "libiberty.h"
  28 #include "demangle.h"
  29 #include "getopt.h"
  30 #include "safe-ctype.h"
  31 #include "bucomm.h"
  32
  33 static int flags = DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE;
  34 static int strip_underscore = TARGET_PREPENDS_UNDERSCORE;
  35
  36 static const struct option long_options[] =
  37 {
  38   {"strip-underscore", no_argument, NULL, '_'},
  39   {"format", required_argument, NULL, 's'},
  40   {"help", no_argument, NULL, 'h'},
  41   {"no-params", no_argument, NULL, 'p'},
  42   {"no-strip-underscores", no_argument, NULL, 'n'},
  43   {"no-verbose", no_argument, NULL, 'i'},
  44   {"types", no_argument, NULL, 't'},
  45   {"version", no_argument, NULL, 'v'},
  46   {NULL, no_argument, NULL, 0}
  47 };
  48
  49 static void
  50 demangle_it (char *mangled_name)
  51 {
  52   char *result;
  53   unsigned int skip_first = 0;
  54
  55   /* _ and $ are sometimes found at the start of function names
  56      in assembler sources in order to distinguish them from other
  57      names (eg register names).  So skip them here.  */
  58   if (mangled_name[0] == '.' || mangled_name[0] == '$')
  59     ++skip_first;
  60   if (strip_underscore && mangled_name[skip_first] == '_')
  61     ++skip_first;
  62
  63   result = cplus_demangle (mangled_name + skip_first, flags);
  64
  65   if (result == NULL)
  66     printf (mangled_name);
  67   else
  68     {
  69       if (mangled_name[0] == '.')
  70         putchar ('.');
  71       printf (result);
  72       free (result);
  73     }
  74 }
  75
  76 static void
  77 print_demangler_list (FILE *stream)
  78 {
  79   const struct demangler_engine *demangler;
  80
  81   fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name);
  82
  83   for (demangler = libiberty_demanglers + 1;
  84        demangler->demangling_style != unknown_demangling;
  85        ++demangler)
  86     fprintf (stream, ",%s", demangler->demangling_style_name);
  87
  88   fprintf (stream, "}");
  89 }
  90
  91 static void
  92 usage (FILE *stream, int status)
  93 {
  94   fprintf (stream, "\
  95 Usage: %s [options] [mangled names]\n", program_name);
  96   fprintf (stream, "\
  97 Options are:\n\
  98   [-_|--strip-underscore]     Ignore first leading underscore%s\n",
  99            TARGET_PREPENDS_UNDERSCORE ? " (default)" : "");
 100   fprintf (stream, "\
 101   [-n|--no-strip-underscore]  Do not ignore a leading underscore%s\n",
 102            TARGET_PREPENDS_UNDERSCORE ? "" : " (default)");
 103   fprintf (stream, "\
 104   [-p|--no-params]            Do not display function arguments\n\
 105   [-i|--no-verbose]           Do not show implementation details (if any)\n\
 106   [-t|--types]                Also attempt to demangle type encodings\n\
 107   [-s|--format ");
 108   print_demangler_list (stream);
 109   fprintf (stream, "]\n");
 110
 111   fprintf (stream, "\
 112   [@<file>]                   Read extra options from <file>\n\
 113   [-h|--help]                 Display this information\n\
 114   [-v|--version]              Show the version information\n\
 115 Demangled names are displayed to stdout.\n\
 116 If a name cannot be demangled it is just echoed to stdout.\n\
 117 If no names are provided on the command line, stdin is read.\n");
 118   if (REPORT_BUGS_TO[0] && status == 0)
 119     fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO);
 120   exit (status);
 121 }
 122
 123 /* Return the string of non-alnum characters that may occur
 124    as a valid symbol component, in the standard assembler symbol
 125    syntax.  */
 126
 127 static const char *
 128 standard_symbol_characters (void)
 129 {
 130   return "_$.";
 131 }
 132
 133 /* Return the string of non-alnum characters that may occur
 134    as a valid symbol name component in an HP object file.
 135
 136    Note that, since HP's compiler generates object code straight from
 137    C++ source, without going through an assembler, its mangled
 138    identifiers can use all sorts of characters that no assembler would
 139    tolerate, so the alphabet this function creates is a little odd.
 140    Here are some sample mangled identifiers offered by HP:
 141
 142         typeid*__XT24AddressIndExpClassMember_
 143         [Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv
 144         __ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv
 145
 146    This still seems really weird to me, since nowhere else in this
 147    file is there anything to recognize curly brackets, parens, etc.
 148    I've talked with Srikanth <srikanth@cup.hp.com>, and he assures me
 149    this is right, but I still strongly suspect that there's a
 150    misunderstanding here.
 151
 152    If we decide it's better for c++filt to use HP's assembler syntax
 153    to scrape identifiers out of its input, here's the definition of
 154    the symbol name syntax from the HP assembler manual:
 155
 156        Symbols are composed of uppercase and lowercase letters, decimal
 157        digits, dollar symbol, period (.), ampersand (&), pound sign(#) and
 158        underscore (_). A symbol can begin with a letter, digit underscore or
 159        dollar sign. If a symbol begins with a digit, it must contain a
 160        non-digit character.
 161
 162    So have fun.  */
 163 static const char *
 164 hp_symbol_characters (void)
 165 {
 166   return "_$.<>#,*&[]:(){}";
 167 }
 168
 169 extern int main (int, char **);
 170
 171 int
 172 main (int argc, char **argv)
 173 {
 174   int c;
 175   const char *valid_symbols;
 176   enum demangling_styles style = auto_demangling;
 177
 178   program_name = argv[0];
 179   xmalloc_set_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 auto_demangling:
 244       valid_symbols = standard_symbol_characters ();
 245       break;
 246     case hp_demangling:
 247       valid_symbols = hp_symbol_characters ();
 248       break;
 249     default:
 250       /* Folks should explicitly indicate the appropriate alphabet for
 251          each demangling.  Providing a default would allow the
 252          question to go unconsidered.  */
 253       fatal ("Internal error: no symbol alphabet for current style");
 254     }
 255
 256   for (;;)
 257     {
 258       static char mbuffer[32767];
 259       unsigned i = 0;
 260
 261       c = getchar ();
 262       /* Try to read a mangled name.  */
 263       while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
 264         {
 265           if (i >= sizeof (mbuffer) - 1)
 266             break;
 267           mbuffer[i++] = c;
 268           c = getchar ();
 269         }
 270
 271       if (i > 0)
 272         {
 273           mbuffer[i] = 0;
 274           demangle_it (mbuffer);
 275         }
 276
 277       if (c == EOF)
 278         break;
 279
 280       /* Echo the whitespace characters so that the output looks
 281          like the input, only with the mangled names demangled.  */
 282       putchar (c);
 283       if (c == '\n')
 284         fflush (stdout);
 285     }
 286
 287   fflush (stdout);
 288   return 0;
 289 }