aboutsummaryrefslogtreecommitdiff
path: root/binutils/cxxfilt.c
blob: d5863ee962278c1ebfecf3608d7c285c01de794b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
/* Demangler for GNU C++ - main program
   Copyright (C) 1989-2016 Free Software Foundation, Inc.
   Written by James Clark (jjc@jclark.uucp)
   Rewritten by Fred Fish (fnf@cygnus.com) for ARM and Lucid demangling
   Modified by Satish Pai (pai@apollo.hp.com) for HP demangling

   This file is part of GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GCC; see the file COPYING.  If not, write to the Free
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "libiberty.h"
#include "demangle.h"
#include "getopt.h"
#include "safe-ctype.h"
#include "bucomm.h"

static int flags = DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE;
static int strip_underscore = TARGET_PREPENDS_UNDERSCORE;

static const struct option long_options[] =
{
  {"strip-underscore", no_argument, NULL, '_'},
  {"format", required_argument, NULL, 's'},
  {"help", no_argument, NULL, 'h'},
  {"no-params", no_argument, NULL, 'p'},
  {"no-strip-underscores", no_argument, NULL, 'n'},
  {"no-verbose", no_argument, NULL, 'i'},
  {"types", no_argument, NULL, 't'},
  {"version", no_argument, NULL, 'v'},
  {NULL, no_argument, NULL, 0}
};

static void
demangle_it (char *mangled_name)
{
  char *result;
  unsigned int skip_first = 0;

  /* _ and $ are sometimes found at the start of function names
     in assembler sources in order to distinguish them from other
     names (eg register names).  So skip them here.  */
  if (mangled_name[0] == '.' || mangled_name[0] == '$')
    ++skip_first;
  if (strip_underscore && mangled_name[skip_first] == '_')
    ++skip_first;

  result = cplus_demangle (mangled_name + skip_first, flags);

  if (result == NULL)
    printf ("%s", mangled_name);
  else
    {
      if (mangled_name[0] == '.')
	putchar ('.');
      printf ("%s", result);
      free (result);
    }
}

static void
print_demangler_list (FILE *stream)
{
  const struct demangler_engine *demangler;

  fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name);

  for (demangler = libiberty_demanglers + 1;
       demangler->demangling_style != unknown_demangling;
       ++demangler)
    fprintf (stream, ",%s", demangler->demangling_style_name);

  fprintf (stream, "}");
}

ATTRIBUTE_NORETURN static void
usage (FILE *stream, int status)
{
  fprintf (stream, "\
Usage: %s [options] [mangled names]\n", program_name);
  fprintf (stream, "\
Options are:\n\
  [-_|--strip-underscore]     Ignore first leading underscore%s\n",
	   TARGET_PREPENDS_UNDERSCORE ? " (default)" : "");
  fprintf (stream, "\
  [-n|--no-strip-underscore]  Do not ignore a leading underscore%s\n",
	   TARGET_PREPENDS_UNDERSCORE ? "" : " (default)");
  fprintf (stream, "\
  [-p|--no-params]            Do not display function arguments\n\
  [-i|--no-verbose]           Do not show implementation details (if any)\n\
  [-t|--types]                Also attempt to demangle type encodings\n\
  [-s|--format ");
  print_demangler_list (stream);
  fprintf (stream, "]\n");

  fprintf (stream, "\
  [@<file>]                   Read extra options from <file>\n\
  [-h|--help]                 Display this information\n\
  [-v|--version]              Show the version information\n\
Demangled names are displayed to stdout.\n\
If a name cannot be demangled it is just echoed to stdout.\n\
If no names are provided on the command line, stdin is read.\n");
  if (REPORT_BUGS_TO[0] && status == 0)
    fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO);
  exit (status);
}

/* Return the string of non-alnum characters that may occur
   as a valid symbol component, in the standard assembler symbol
   syntax.  */

static const char *
standard_symbol_characters (void)
{
  return "_$.";
}

/* Return the string of non-alnum characters that may occur
   as a valid symbol name component in an HP object file.

   Note that, since HP's compiler generates object code straight from
   C++ source, without going through an assembler, its mangled
   identifiers can use all sorts of characters that no assembler would
   tolerate, so the alphabet this function creates is a little odd.
   Here are some sample mangled identifiers offered by HP:

	typeid*__XT24AddressIndExpClassMember_
	[Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv
	__ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv

   This still seems really weird to me, since nowhere else in this
   file is there anything to recognize curly brackets, parens, etc.
   I've talked with Srikanth <srikanth@cup.hp.com>, and he assures me
   this is right, but I still strongly suspect that there's a
   misunderstanding here.

   If we decide it's better for c++filt to use HP's assembler syntax
   to scrape identifiers out of its input, here's the definition of
   the symbol name syntax from the HP assembler manual:

       Symbols are composed of uppercase and lowercase letters, decimal
       digits, dollar symbol, period (.), ampersand (&), pound sign(#) and
       underscore (_). A symbol can begin with a letter, digit underscore or
       dollar sign. If a symbol begins with a digit, it must contain a
       non-digit character.

   So have fun.  */
static const char *
hp_symbol_characters (void)
{
  return "_$.<>#,*&[]:(){}";
}

extern int main (int, char **);

int
main (int argc, char **argv)
{
  int c;
  const char *valid_symbols;
  enum demangling_styles style = auto_demangling;

  program_name = argv[0];
  xmalloc_set_program_name (program_name);
  bfd_set_error_program_name (program_name);

  expandargv (&argc, &argv);

  while ((c = getopt_long (argc, argv, "_hinps:tv", long_options, (int *) 0)) != EOF)
    {
      switch (c)
	{
	case '?':
	  usage (stderr, 1);
	  break;
	case 'h':
	  usage (stdout, 0);
	case 'n':
	  strip_underscore = 0;
	  break;
	case 'p':
	  flags &= ~ DMGL_PARAMS;
	  break;
	case 't':
	  flags |= DMGL_TYPES;
	  break;
	case 'i':
	  flags &= ~ DMGL_VERBOSE;
	  break;
	case 'v':
	  print_version ("c++filt");
	  return 0;
	case '_':
	  strip_underscore = 1;
	  break;
	case 's':
	  style = cplus_demangle_name_to_style (optarg);
	  if (style == unknown_demangling)
	    {
	      fprintf (stderr, "%s: unknown demangling style `%s'\n",
		       program_name, optarg);
	      return 1;
	    }
	  cplus_demangle_set_style (style);
	  break;
	}
    }

  if (optind < argc)
    {
      for ( ; optind < argc; optind++)
	{
	  demangle_it (argv[optind]);
	  putchar ('\n');
	}

      return 0;
    }

  switch (current_demangling_style)
    {
    case gnu_demangling:
    case lucid_demangling:
    case arm_demangling:
    case java_demangling:
    case edg_demangling:
    case gnat_demangling:
    case gnu_v3_demangling:
    case dlang_demangling:
    case auto_demangling:
      valid_symbols = standard_symbol_characters ();
      break;
    case hp_demangling:
      valid_symbols = hp_symbol_characters ();
      break;
    default:
      /* Folks should explicitly indicate the appropriate alphabet for
	 each demangling.  Providing a default would allow the
	 question to go unconsidered.  */
      fatal ("Internal error: no symbol alphabet for current style");
    }

  for (;;)
    {
      static char mbuffer[32767];
      unsigned i = 0;

      c = getchar ();
      /* Try to read a mangled name.  */
      while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
	{
	  if (i >= sizeof (mbuffer) - 1)
	    break;
	  mbuffer[i++] = c;
	  c = getchar ();
	}

      if (i > 0)
	{
	  mbuffer[i] = 0;
	  demangle_it (mbuffer);
	}

      if (c == EOF)
	break;

      /* Echo the whitespace characters so that the output looks
	 like the input, only with the mangled names demangled.  */
      putchar (c);
      if (c == '\n')
	fflush (stdout);
    }

  fflush (stdout);
  return 0;
}