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[binutils.git] / binutils / cxxfilt.c
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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
8 This file is part of GNU Binutils.
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.
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.
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. */
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"
33 static int flags = DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE;
34 static int strip_underscore = TARGET_PREPENDS_UNDERSCORE;
36 static const struct option long_options[] =
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}
49 static void
50 demangle_it (char *mangled_name)
52 char *result;
53 unsigned int skip_first = 0;
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;
63 result = cplus_demangle (mangled_name + skip_first, flags);
65 if (result == NULL)
66 printf ("%s", mangled_name);
67 else
69 if (mangled_name[0] == '.')
70 putchar ('.');
71 printf ("%s", result);
72 free (result);
76 static void
77 print_demangler_list (FILE *stream)
79 const struct demangler_engine *demangler;
81 fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name);
83 for (demangler = libiberty_demanglers + 1;
84 demangler->demangling_style != unknown_demangling;
85 ++demangler)
86 fprintf (stream, ",%s", demangler->demangling_style_name);
88 fprintf (stream, "}");
91 static void
92 usage (FILE *stream, int status)
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");
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);
123 /* Return the string of non-alnum characters that may occur
124 as a valid symbol component, in the standard assembler symbol
125 syntax. */
127 static const char *
128 standard_symbol_characters (void)
130 return "_$.";
133 /* Return the string of non-alnum characters that may occur
134 as a valid symbol name component in an HP object file.
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:
142 typeid*__XT24AddressIndExpClassMember_
143 [Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv
144 __ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv
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.
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:
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.
162 So have fun. */
163 static const char *
164 hp_symbol_characters (void)
166 return "_$.<>#,*&[]:(){}";
169 extern int main (int, char **);
172 main (int argc, char **argv)
174 int c;
175 const char *valid_symbols;
176 enum demangling_styles style = auto_demangling;
178 program_name = argv[0];
179 xmalloc_set_program_name (program_name);
181 expandargv (&argc, &argv);
183 while ((c = getopt_long (argc, argv, "_hinps:tv", long_options, (int *) 0)) != EOF)
185 switch (c)
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)
214 fprintf (stderr, "%s: unknown demangling style `%s'\n",
215 program_name, optarg);
216 return 1;
218 cplus_demangle_set_style (style);
219 break;
223 if (optind < argc)
225 for ( ; optind < argc; optind++)
227 demangle_it (argv[optind]);
228 putchar ('\n');
231 return 0;
234 switch (current_demangling_style)
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");
256 for (;;)
258 static char mbuffer[32767];
259 unsigned i = 0;
261 c = getchar ();
262 /* Try to read a mangled name. */
263 while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c)))
265 if (i >= sizeof (mbuffer) - 1)
266 break;
267 mbuffer[i++] = c;
268 c = getchar ();
271 if (i > 0)
273 mbuffer[i] = 0;
274 demangle_it (mbuffer);
277 if (c == EOF)
278 break;
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);
287 fflush (stdout);
288 return 0;