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 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 GCC.
   9
  10 GCC is free software; you can redistribute it and/or modify it under
  11 the terms of the GNU General Public License as published by the Free
  12 Software Foundation; either version 2, or (at your option) any later
  13 version.
  14
  15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  18 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, 59 Temple Place - Suite 330, Boston, MA
  23 02111-1307, USA.  */
  24
  25 #include "config.h"
  26 #include "bfd.h"
  27 #include "bucomm.h"
  28 #include "libiberty.h"
  29 #include "demangle.h"
  30 #include "getopt.h"
  31 #include "safe-ctype.h"
  32
  33 static int flags = DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE;
  34
  35 static void demangle_it (char *);
  36 static void usage (FILE *, int) ATTRIBUTE_NORETURN;
  37 static void print_demangler_list (FILE *);
  38
  39 static void
  40 demangle_it (char *mangled_name)
  41 {
  42   char *result;
  43
  44   /* For command line args, also try to demangle type encodings.  */
  45   result = cplus_demangle (mangled_name, flags | DMGL_TYPES);
  46   if (result == NULL)
  47     {
  48       printf ("%s\n", mangled_name);
  49     }
  50   else
  51     {
  52       printf ("%s\n", result);
  53       free (result);
  54     }
  55 }
  56
  57 static void
  58 print_demangler_list (FILE *stream)
  59 {
  60   const struct demangler_engine *demangler;
  61
  62   fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name);
  63
  64   for (demangler = libiberty_demanglers + 1;
  65        demangler->demangling_style != unknown_demangling;
  66        ++demangler)
  67     fprintf (stream, ",%s", demangler->demangling_style_name);
  68
  69   fprintf (stream, "}");
  70 }
  71
  72 static void
  73 usage (FILE *stream, int status)
  74 {
  75   fprintf (stream, "\
  76 Usage: %s [-_] [-n] [--strip-underscores] [--no-strip-underscores]\n\
  77        [-p] [--no-params]\n",
  78            program_name);
  79
  80   fprintf (stream, "\
  81        [-s ");
  82   print_demangler_list (stream);
  83   fprintf (stream, "]\n");
  84
  85   fprintf (stream, "\
  86        [--format ");
  87   print_demangler_list (stream);
  88   fprintf (stream, "]\n");
  89
  90   fprintf (stream, "\
  91        [--help] [--version] [arg...]\n");
  92   exit (status);
  93 }
  94
  95 #define MBUF_SIZE 32767
  96 char mbuffer[MBUF_SIZE];
  97
  98 int strip_underscore = 0;
  99
 100 static const struct option long_options[] = {
 101   {"strip-underscores", no_argument, 0, '_'},
 102   {"format", required_argument, 0, 's'},
 103   {"help", no_argument, 0, 'h'},
 104   {"no-params", no_argument, 0, 'p'},
 105   {"no-strip-underscores", no_argument, 0, 'n'},
 106   {"version", no_argument, 0, 'v'},
 107   {0, no_argument, 0, 0}
 108 };
 109
 110 static const char *standard_symbol_characters (void);
 111
 112 static const char *hp_symbol_characters (void);
 113
 114 /* Return the string of non-alnum characters that may occur
 115    as a valid symbol component, in the standard assembler symbol
 116    syntax.  */
 117
 118 static const char *
 119 standard_symbol_characters (void)
 120 {
 121   return "_$.";
 122 }
 123
 124
 125 /* Return the string of non-alnum characters that may occur
 126    as a valid symbol name component in an HP object file.
 127
 128    Note that, since HP's compiler generates object code straight from
 129    C++ source, without going through an assembler, its mangled
 130    identifiers can use all sorts of characters that no assembler would
 131    tolerate, so the alphabet this function creates is a little odd.
 132    Here are some sample mangled identifiers offered by HP:
 133
 134         typeid*__XT24AddressIndExpClassMember_
 135         [Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv
 136         __ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv
 137
 138    This still seems really weird to me, since nowhere else in this
 139    file is there anything to recognize curly brackets, parens, etc.
 140    I've talked with Srikanth <srikanth@cup.hp.com>, and he assures me
 141    this is right, but I still strongly suspect that there's a
 142    misunderstanding here.
 143
 144    If we decide it's better for c++filt to use HP's assembler syntax
 145    to scrape identifiers out of its input, here's the definition of
 146    the symbol name syntax from the HP assembler manual:
 147
 148        Symbols are composed of uppercase and lowercase letters, decimal
 149        digits, dollar symbol, period (.), ampersand (&), pound sign(#) and
 150        underscore (_). A symbol can begin with a letter, digit underscore or
 151        dollar sign. If a symbol begins with a digit, it must contain a
 152        non-digit character.
 153
 154    So have fun.  */
 155 static const char *
 156 hp_symbol_characters (void)
 157 {
 158   return "_$.<>#,*&[]:(){}";
 159 }
 160
 161 extern int main (int, char **);
 162
 163 int
 164 main (int argc, char **argv)
 165 {
 166   char *result;
 167   int c;
 168   const char *valid_symbols;
 169   enum demangling_styles style = auto_demangling;
 170
 171   program_name = argv[0];
 172   xmalloc_set_program_name (program_name);
 173
 174   strip_underscore = TARGET_PREPENDS_UNDERSCORE;
 175
 176   while ((c = getopt_long (argc, argv, "_nps:", long_options, (int *) 0)) != EOF)
 177     {
 178       switch (c)
 179         {
 180         case '?':
 181           usage (stderr, 1);
 182           break;
 183         case 'h':
 184           usage (stdout, 0);
 185         case 'n':
 186           strip_underscore = 0;
 187           break;
 188         case 'p':
 189           flags &= ~ DMGL_PARAMS;
 190           break;
 191         case 'v':
 192           print_version ("c++filt");
 193           return (0);
 194         case '_':
 195           strip_underscore = 1;
 196           break;
 197         case 's':
 198           {
 199             style = cplus_demangle_name_to_style (optarg);
 200             if (style == unknown_demangling)
 201               {
 202                 fprintf (stderr, "%s: unknown demangling style `%s'\n",
 203                          program_name, optarg);
 204                 return (1);
 205               }
 206             else
 207               cplus_demangle_set_style (style);
 208           }
 209           break;
 210         }
 211     }
 212
 213   if (optind < argc)
 214     {
 215       for ( ; optind < argc; optind++)
 216         {
 217           demangle_it (argv[optind]);
 218         }
 219     }
 220   else
 221     {
 222       switch (current_demangling_style)
 223         {
 224         case gnu_demangling:
 225         case lucid_demangling:
 226         case arm_demangling:
 227         case java_demangling:
 228         case edg_demangling:
 229         case gnat_demangling:
 230         case gnu_v3_demangling:
 231         case auto_demangling:
 232           valid_symbols = standard_symbol_characters ();
 233           break;
 234         case hp_demangling:
 235           valid_symbols = hp_symbol_characters ();
 236           break;
 237         default:
 238           /* Folks should explicitly indicate the appropriate alphabet for
 239              each demangling.  Providing a default would allow the
 240              question to go unconsidered.  */
 241           fatal ("Internal error: no symbol alphabet for current style");
 242         }
 243
 244       for (;;)
 245         {
 246           int i = 0;
 247           c = getchar ();
 248           /* Try to read a label.  */
 249           while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
 250             {
 251               if (i >= MBUF_SIZE-1)
 252                 break;
 253               mbuffer[i++] = c;
 254               c = getchar ();
 255             }
 256           if (i > 0)
 257             {
 258               int skip_first = 0;
 259
 260               mbuffer[i] = 0;
 261               if (mbuffer[0] == '.' || mbuffer[0] == '$')
 262                 ++skip_first;
 263               if (strip_underscore && mbuffer[skip_first] == '_')
 264                 ++skip_first;
 265
 266               if (skip_first > i)
 267                 skip_first = i;
 268
 269               flags |= (int) style;
 270               result = cplus_demangle (mbuffer + skip_first, flags);
 271               if (result)
 272                 {
 273                   if (mbuffer[0] == '.')
 274                     putc ('.', stdout);
 275                   fputs (result, stdout);
 276                   free (result);
 277                 }
 278               else
 279                 fputs (mbuffer, stdout);
 280
 281               fflush (stdout);
 282             }
 283           if (c == EOF)
 284             break;
 285           putchar (c);
 286           fflush (stdout);
 287         }
 288     }
 289
 290   return (0);
 291 }