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            program_name);
  78
  79   fprintf (stream, "\
  80        [-s ");
  81   print_demangler_list (stream);
  82   fprintf (stream, "]\n");
  83
  84   fprintf (stream, "\
  85        [--format ");
  86   print_demangler_list (stream);
  87   fprintf (stream, "]\n");
  88
  89   fprintf (stream, "\
  90        [--help] [--version] [arg...]\n");
  91   exit (status);
  92 }
  93
  94 #define MBUF_SIZE 32767
  95 char mbuffer[MBUF_SIZE];
  96
  97 int strip_underscore = 0;
  98
  99 static const struct option long_options[] = {
 100   {"strip-underscores", no_argument, 0, '_'},
 101   {"format", required_argument, 0, 's'},
 102   {"help", no_argument, 0, 'h'},
 103   {"no-strip-underscores", no_argument, 0, 'n'},
 104   {"version", no_argument, 0, 'v'},
 105   {0, no_argument, 0, 0}
 106 };
 107
 108 static const char *standard_symbol_characters (void);
 109
 110 static const char *hp_symbol_characters (void);
 111
 112 /* Return the string of non-alnum characters that may occur
 113    as a valid symbol component, in the standard assembler symbol
 114    syntax.  */
 115
 116 static const char *
 117 standard_symbol_characters (void)
 118 {
 119   return "_$.";
 120 }
 121
 122
 123 /* Return the string of non-alnum characters that may occur
 124    as a valid symbol name component in an HP object file.
 125
 126    Note that, since HP's compiler generates object code straight from
 127    C++ source, without going through an assembler, its mangled
 128    identifiers can use all sorts of characters that no assembler would
 129    tolerate, so the alphabet this function creates is a little odd.
 130    Here are some sample mangled identifiers offered by HP:
 131
 132         typeid*__XT24AddressIndExpClassMember_
 133         [Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv
 134         __ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv
 135
 136    This still seems really weird to me, since nowhere else in this
 137    file is there anything to recognize curly brackets, parens, etc.
 138    I've talked with Srikanth <srikanth@cup.hp.com>, and he assures me
 139    this is right, but I still strongly suspect that there's a
 140    misunderstanding here.
 141
 142    If we decide it's better for c++filt to use HP's assembler syntax
 143    to scrape identifiers out of its input, here's the definition of
 144    the symbol name syntax from the HP assembler manual:
 145
 146        Symbols are composed of uppercase and lowercase letters, decimal
 147        digits, dollar symbol, period (.), ampersand (&), pound sign(#) and
 148        underscore (_). A symbol can begin with a letter, digit underscore or
 149        dollar sign. If a symbol begins with a digit, it must contain a
 150        non-digit character.
 151
 152    So have fun.  */
 153 static const char *
 154 hp_symbol_characters (void)
 155 {
 156   return "_$.<>#,*&[]:(){}";
 157 }
 158
 159 extern int main (int, char **);
 160
 161 int
 162 main (int argc, char **argv)
 163 {
 164   char *result;
 165   int c;
 166   const char *valid_symbols;
 167   enum demangling_styles style = auto_demangling;
 168
 169   program_name = argv[0];
 170   xmalloc_set_program_name (program_name);
 171
 172   strip_underscore = TARGET_PREPENDS_UNDERSCORE;
 173
 174   while ((c = getopt_long (argc, argv, "_ns:", long_options, (int *) 0)) != EOF)
 175     {
 176       switch (c)
 177         {
 178         case '?':
 179           usage (stderr, 1);
 180           break;
 181         case 'h':
 182           usage (stdout, 0);
 183         case 'n':
 184           strip_underscore = 0;
 185           break;
 186         case 'v':
 187           print_version ("c++filt");
 188           return (0);
 189         case '_':
 190           strip_underscore = 1;
 191           break;
 192         case 's':
 193           {
 194             style = cplus_demangle_name_to_style (optarg);
 195             if (style == unknown_demangling)
 196               {
 197                 fprintf (stderr, "%s: unknown demangling style `%s'\n",
 198                          program_name, optarg);
 199                 return (1);
 200               }
 201             else
 202               cplus_demangle_set_style (style);
 203           }
 204           break;
 205         }
 206     }
 207
 208   if (optind < argc)
 209     {
 210       for ( ; optind < argc; optind++)
 211         {
 212           demangle_it (argv[optind]);
 213         }
 214     }
 215   else
 216     {
 217       switch (current_demangling_style)
 218         {
 219         case gnu_demangling:
 220         case lucid_demangling:
 221         case arm_demangling:
 222         case java_demangling:
 223         case edg_demangling:
 224         case gnat_demangling:
 225         case gnu_v3_demangling:
 226         case auto_demangling:
 227           valid_symbols = standard_symbol_characters ();
 228           break;
 229         case hp_demangling:
 230           valid_symbols = hp_symbol_characters ();
 231           break;
 232         default:
 233           /* Folks should explicitly indicate the appropriate alphabet for
 234              each demangling.  Providing a default would allow the
 235              question to go unconsidered.  */
 236           fatal ("Internal error: no symbol alphabet for current style");
 237         }
 238
 239       for (;;)
 240         {
 241           int i = 0;
 242           c = getchar ();
 243           /* Try to read a label.  */
 244           while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
 245             {
 246               if (i >= MBUF_SIZE-1)
 247                 break;
 248               mbuffer[i++] = c;
 249               c = getchar ();
 250             }
 251           if (i > 0)
 252             {
 253               int skip_first = 0;
 254
 255               mbuffer[i] = 0;
 256               if (mbuffer[0] == '.' || mbuffer[0] == '$')
 257                 ++skip_first;
 258               if (strip_underscore && mbuffer[skip_first] == '_')
 259                 ++skip_first;
 260
 261               if (skip_first > i)
 262                 skip_first = i;
 263
 264               flags |= (int) style;
 265               result = cplus_demangle (mbuffer + skip_first, flags);
 266               if (result)
 267                 {
 268                   if (mbuffer[0] == '.')
 269                     putc ('.', stdout);
 270                   fputs (result, stdout);
 271                   free (result);
 272                 }
 273               else
 274                 fputs (mbuffer, stdout);
 275
 276               fflush (stdout);
 277             }
 278           if (c == EOF)
 279             break;
 280           putchar (c);
 281           fflush (stdout);
 282         }
 283     }
 284
 285   return (0);
 286 }