1 /* Basic C++ demangling support for GDB. 2 3 Copyright (C) 1991-1996, 1998-2001, 2003, 2007-2012 Free Software 4 Foundation, Inc. 5 6 Written by Fred Fish at Cygnus Support. 7 8 This file is part of GDB. 9 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 13 (at your option) any later version. 14 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. 19 20 You should have received a copy of the GNU General Public License 21 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 22 23 24 /* This file contains support code for C++ demangling that is common 25 to a styles of demangling, and GDB specific. */ 26 27 #include "defs.h" 28 #include "command.h" 29 #include "gdbcmd.h" 30 #include "demangle.h" 31 #include "gdb-demangle.h" 32 #include "gdb_string.h" 33 34 /* Select the default C++ demangling style to use. The default is "auto", 35 which allows gdb to attempt to pick an appropriate demangling style for 36 the executable it has loaded. It can be set to a specific style ("gnu", 37 "lucid", "arm", "hp", etc.) in which case gdb will never attempt to do auto 38 selection of the style unless you do an explicit "set demangle auto". 39 To select one of these as the default, set DEFAULT_DEMANGLING_STYLE in 40 the appropriate target configuration file. */ 41 42 #ifndef DEFAULT_DEMANGLING_STYLE 43 #define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING 44 #endif 45 46 /* See documentation in gdb-demangle.h. */ 47 int demangle = 1; 48 49 static void 50 show_demangle (struct ui_file *file, int from_tty, 51 struct cmd_list_element *c, const char *value) 52 { 53 fprintf_filtered (file, 54 _("Demangling of encoded C++/ObjC names " 55 "when displaying symbols is %s.\n"), 56 value); 57 } 58 59 /* See documentation in gdb-demangle.h. */ 60 int asm_demangle = 0; 61 62 static void 63 show_asm_demangle (struct ui_file *file, int from_tty, 64 struct cmd_list_element *c, const char *value) 65 { 66 fprintf_filtered (file, 67 _("Demangling of C++/ObjC names in " 68 "disassembly listings is %s.\n"), 69 value); 70 } 71 72 /* String name for the current demangling style. Set by the 73 "set demangle-style" command, printed as part of the output by the 74 "show demangle-style" command. */ 75 76 static char *current_demangling_style_string; 77 78 /* The array of names of the known demanglyng styles. Generated by 79 _initialize_demangler from libiberty_demanglers[] array. */ 80 81 static const char **demangling_style_names; 82 static void 83 show_demangling_style_names(struct ui_file *file, int from_tty, 84 struct cmd_list_element *c, const char *value) 85 { 86 fprintf_filtered (file, _("The current C++ demangling style is \"%s\".\n"), 87 value); 88 } 89 90 /* Set current demangling style. Called by the "set demangle-style" 91 command after it has updated the current_demangling_style_string to 92 match what the user has entered. 93 94 If the user has entered a string that matches a known demangling style 95 name in the demanglers[] array then just leave the string alone and update 96 the current_demangling_style enum value to match. 97 98 If the user has entered a string that doesn't match, including an empty 99 string, then print a list of the currently known styles and restore 100 the current_demangling_style_string to match the current_demangling_style 101 enum value. 102 103 Note: Assumes that current_demangling_style_string always points to 104 a malloc'd string, even if it is a null-string. */ 105 106 static void 107 set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c) 108 { 109 const struct demangler_engine *dem; 110 111 /* First just try to match whatever style name the user supplied with 112 one of the known ones. Don't bother special casing for an empty 113 name, we just treat it as any other style name that doesn't match. 114 If we match, update the current demangling style enum. */ 115 116 for (dem = libiberty_demanglers; 117 dem->demangling_style != unknown_demangling; 118 dem++) 119 { 120 if (strcmp (current_demangling_style_string, 121 dem->demangling_style_name) == 0) 122 { 123 current_demangling_style = dem->demangling_style; 124 break; 125 } 126 } 127 128 /* Check to see if we found a match. If not, gripe about any non-empty 129 style name and supply a list of valid ones. FIXME: This should 130 probably be done with some sort of completion and with help. */ 131 132 if (dem->demangling_style == unknown_demangling) 133 { 134 if (*current_demangling_style_string != '\0') 135 { 136 printf_unfiltered (_("Unknown demangling style `%s'.\n"), 137 current_demangling_style_string); 138 } 139 printf_unfiltered (_("The currently understood settings are:\n\n")); 140 for (dem = libiberty_demanglers; 141 dem->demangling_style != unknown_demangling; 142 dem++) 143 { 144 printf_unfiltered ("%-10s %s\n", dem->demangling_style_name, 145 dem->demangling_style_doc); 146 if (dem->demangling_style == current_demangling_style) 147 { 148 xfree (current_demangling_style_string); 149 current_demangling_style_string = 150 xstrdup (dem->demangling_style_name); 151 } 152 } 153 if (current_demangling_style == unknown_demangling) 154 { 155 /* This can happen during initialization if gdb is compiled with 156 a DEMANGLING_STYLE value that is unknown, so pick the first 157 one as the default. */ 158 current_demangling_style = libiberty_demanglers[0].demangling_style; 159 current_demangling_style_string = 160 xstrdup (libiberty_demanglers[0].demangling_style_name); 161 warning (_("`%s' style demangling chosen as the default."), 162 current_demangling_style_string); 163 } 164 } 165 } 166 167 /* See documentation in gdb-demangle.h. */ 168 169 void 170 set_demangling_style (char *style) 171 { 172 if (current_demangling_style_string != NULL) 173 { 174 xfree (current_demangling_style_string); 175 } 176 current_demangling_style_string = xstrdup (style); 177 set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL); 178 } 179 180 /* G++ uses a special character to indicate certain internal names. Which 181 character it is depends on the platform: 182 - Usually '$' on systems where the assembler will accept that 183 - Usually '.' otherwise (this includes most sysv4-like systems and most 184 ELF targets) 185 - Occasionally '_' if neither of the above is usable 186 187 We check '$' first because it is the safest, and '.' often has another 188 meaning. We don't currently try to handle '_' because the precise forms 189 of the names are different on those targets. */ 190 191 static char cplus_markers[] = {'$', '.', '\0'}; 192 193 /* See documentation in gdb-demangle.h. */ 194 195 int 196 is_cplus_marker (int c) 197 { 198 return c && strchr (cplus_markers, c) != NULL; 199 } 200 201 extern initialize_file_ftype _initialize_demangler; /* -Wmissing-prototypes */ 202 203 void 204 _initialize_demangler (void) 205 { 206 int i, ndems; 207 208 /* Fill the demangling_style_names[] array. */ 209 for (ndems = 0; 210 libiberty_demanglers[ndems].demangling_style != unknown_demangling; 211 ndems++) 212 ; 213 demangling_style_names = xcalloc (ndems + 1, sizeof (char *)); 214 for (i = 0; 215 libiberty_demanglers[i].demangling_style != unknown_demangling; 216 i++) 217 demangling_style_names[i] = 218 xstrdup (libiberty_demanglers[i].demangling_style_name); 219 220 add_setshow_boolean_cmd ("demangle", class_support, &demangle, _("\ 221 Set demangling of encoded C++/ObjC names when displaying symbols."), _("\ 222 Show demangling of encoded C++/ObjC names when displaying symbols."), NULL, 223 NULL, 224 show_demangle, 225 &setprintlist, &showprintlist); 226 227 add_setshow_boolean_cmd ("asm-demangle", class_support, &asm_demangle, _("\ 228 Set demangling of C++/ObjC names in disassembly listings."), _("\ 229 Show demangling of C++/ObjC names in disassembly listings."), NULL, 230 NULL, 231 show_asm_demangle, 232 &setprintlist, &showprintlist); 233 234 /* FIXME: cagney/2005-02-20: The code implementing this variable are 235 malloc-ing and free-ing current_demangling_style_string when it 236 should instead just point to an element of 237 demangling_style_names. */ 238 add_setshow_enum_cmd ("demangle-style", class_support, 239 demangling_style_names, 240 (const char **) ¤t_demangling_style_string, _("\ 241 Set the current C++ demangling style."), _("\ 242 Show the current C++ demangling style."), _("\ 243 Use `set demangle-style' without arguments for a list of demangling styles."), 244 set_demangling_command, 245 show_demangling_style_names, 246 &setlist, &showlist); 247 248 /* Set the default demangling style chosen at compilation time. */ 249 set_demangling_style (DEFAULT_DEMANGLING_STYLE); 250 } 251