1 /* Demangler for GNU C++ - main program 2 Copyright (C) 1989-2016 Free Software Foundation, Inc. 3 Written by James Clark (jjc (at) jclark.uucp) 4 Rewritten by Fred Fish (fnf (at) cygnus.com) for ARM and Lucid demangling 5 Modified by Satish Pai (pai (at) apollo.hp.com) for HP demangling 6 7 This file is part of GNU Binutils. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or (at 12 your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with GCC; see the file COPYING. If not, write to the Free 21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 22 02110-1301, USA. */ 23 24 #include "sysdep.h" 25 #include "bfd.h" 26 #include "libiberty.h" 27 #include "demangle.h" 28 #include "getopt.h" 29 #include "safe-ctype.h" 30 #include "bucomm.h" 31 32 static int flags = DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE; 33 static int strip_underscore = TARGET_PREPENDS_UNDERSCORE; 34 35 static const struct option long_options[] = 36 { 37 {"strip-underscore", no_argument, NULL, '_'}, 38 {"format", required_argument, NULL, 's'}, 39 {"help", no_argument, NULL, 'h'}, 40 {"no-params", no_argument, NULL, 'p'}, 41 {"no-strip-underscores", no_argument, NULL, 'n'}, 42 {"no-verbose", no_argument, NULL, 'i'}, 43 {"types", no_argument, NULL, 't'}, 44 {"version", no_argument, NULL, 'v'}, 45 {NULL, no_argument, NULL, 0} 46 }; 47 48 static void 49 demangle_it (char *mangled_name) 50 { 51 char *result; 52 unsigned int skip_first = 0; 53 54 /* _ and $ are sometimes found at the start of function names 55 in assembler sources in order to distinguish them from other 56 names (eg register names). So skip them here. */ 57 if (mangled_name[0] == '.' || mangled_name[0] == '$') 58 ++skip_first; 59 if (strip_underscore && mangled_name[skip_first] == '_') 60 ++skip_first; 61 62 result = cplus_demangle (mangled_name + skip_first, flags); 63 64 if (result == NULL) 65 printf ("%s", mangled_name); 66 else 67 { 68 if (mangled_name[0] == '.') 69 putchar ('.'); 70 printf ("%s", result); 71 free (result); 72 } 73 } 74 75 static void 76 print_demangler_list (FILE *stream) 77 { 78 const struct demangler_engine *demangler; 79 80 fprintf (stream, "{%s", libiberty_demanglers->demangling_style_name); 81 82 for (demangler = libiberty_demanglers + 1; 83 demangler->demangling_style != unknown_demangling; 84 ++demangler) 85 fprintf (stream, ",%s", demangler->demangling_style_name); 86 87 fprintf (stream, "}"); 88 } 89 90 static void 91 usage (FILE *stream, int status) 92 { 93 fprintf (stream, "\ 94 Usage: %s [options] [mangled names]\n", program_name); 95 fprintf (stream, "\ 96 Options are:\n\ 97 [-_|--strip-underscore] Ignore first leading underscore%s\n", 98 TARGET_PREPENDS_UNDERSCORE ? " (default)" : ""); 99 fprintf (stream, "\ 100 [-n|--no-strip-underscore] Do not ignore a leading underscore%s\n", 101 TARGET_PREPENDS_UNDERSCORE ? "" : " (default)"); 102 fprintf (stream, "\ 103 [-p|--no-params] Do not display function arguments\n\ 104 [-i|--no-verbose] Do not show implementation details (if any)\n\ 105 [-t|--types] Also attempt to demangle type encodings\n\ 106 [-s|--format "); 107 print_demangler_list (stream); 108 fprintf (stream, "]\n"); 109 110 fprintf (stream, "\ 111 [@<file>] Read extra options from <file>\n\ 112 [-h|--help] Display this information\n\ 113 [-v|--version] Show the version information\n\ 114 Demangled names are displayed to stdout.\n\ 115 If a name cannot be demangled it is just echoed to stdout.\n\ 116 If no names are provided on the command line, stdin is read.\n"); 117 if (REPORT_BUGS_TO[0] && status == 0) 118 fprintf (stream, _("Report bugs to %s.\n"), REPORT_BUGS_TO); 119 exit (status); 120 } 121 122 /* Return the string of non-alnum characters that may occur 123 as a valid symbol component, in the standard assembler symbol 124 syntax. */ 125 126 static const char * 127 standard_symbol_characters (void) 128 { 129 return "_$."; 130 } 131 132 /* Return the string of non-alnum characters that may occur 133 as a valid symbol name component in an HP object file. 134 135 Note that, since HP's compiler generates object code straight from 136 C++ source, without going through an assembler, its mangled 137 identifiers can use all sorts of characters that no assembler would 138 tolerate, so the alphabet this function creates is a little odd. 139 Here are some sample mangled identifiers offered by HP: 140 141 typeid*__XT24AddressIndExpClassMember_ 142 [Vftptr]key:__dt__32OrdinaryCompareIndExpClassMemberFv 143 __ct__Q2_9Elf64_Dyn18{unnamed.union.#1}Fv 144 145 This still seems really weird to me, since nowhere else in this 146 file is there anything to recognize curly brackets, parens, etc. 147 I've talked with Srikanth <srikanth (at) cup.hp.com>, and he assures me 148 this is right, but I still strongly suspect that there's a 149 misunderstanding here. 150 151 If we decide it's better for c++filt to use HP's assembler syntax 152 to scrape identifiers out of its input, here's the definition of 153 the symbol name syntax from the HP assembler manual: 154 155 Symbols are composed of uppercase and lowercase letters, decimal 156 digits, dollar symbol, period (.), ampersand (&), pound sign(#) and 157 underscore (_). A symbol can begin with a letter, digit underscore or 158 dollar sign. If a symbol begins with a digit, it must contain a 159 non-digit character. 160 161 So have fun. */ 162 static const char * 163 hp_symbol_characters (void) 164 { 165 return "_$.<>#,*&[]:(){}"; 166 } 167 168 extern int main (int, char **); 169 170 int 171 main (int argc, char **argv) 172 { 173 int c; 174 const char *valid_symbols; 175 enum demangling_styles style = auto_demangling; 176 177 program_name = argv[0]; 178 xmalloc_set_program_name (program_name); 179 bfd_set_error_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 dlang_demangling: 244 case auto_demangling: 245 valid_symbols = standard_symbol_characters (); 246 break; 247 case hp_demangling: 248 valid_symbols = hp_symbol_characters (); 249 break; 250 default: 251 /* Folks should explicitly indicate the appropriate alphabet for 252 each demangling. Providing a default would allow the 253 question to go unconsidered. */ 254 fatal ("Internal error: no symbol alphabet for current style"); 255 } 256 257 for (;;) 258 { 259 static char mbuffer[32767]; 260 unsigned i = 0; 261 262 c = getchar (); 263 /* Try to read a mangled name. */ 264 while (c != EOF && (ISALNUM (c) || strchr (valid_symbols, c))) 265 { 266 if (i >= sizeof (mbuffer) - 1) 267 break; 268 mbuffer[i++] = c; 269 c = getchar (); 270 } 271 272 if (i > 0) 273 { 274 mbuffer[i] = 0; 275 demangle_it (mbuffer); 276 } 277 278 if (c == EOF) 279 break; 280 281 /* Echo the whitespace characters so that the output looks 282 like the input, only with the mangled names demangled. */ 283 putchar (c); 284 if (c == '\n') 285 fflush (stdout); 286 } 287 288 fflush (stdout); 289 return 0; 290 } 291
