1 /* Basic C++ demangling support for GDB. 2 3 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 4 2003, 2007, 2008, 2009, 2010 Free Software 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_string.h" 32 33 /* Select the default C++ demangling style to use. The default is "auto", 34 which allows gdb to attempt to pick an appropriate demangling style for 35 the executable it has loaded. It can be set to a specific style ("gnu", 36 "lucid", "arm", "hp", etc.) in which case gdb will never attempt to do auto 37 selection of the style unless you do an explicit "set demangle auto". 38 To select one of these as the default, set DEFAULT_DEMANGLING_STYLE in 39 the appropriate target configuration file. */ 40 41 #ifndef DEFAULT_DEMANGLING_STYLE 42 #define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING 43 #endif 44 45 extern void _initialize_demangler (void); 46 47 /* String name for the current demangling style. Set by the 48 "set demangle-style" command, printed as part of the output by the 49 "show demangle-style" command. */ 50 51 static char *current_demangling_style_string; 52 53 /* The array of names of the known demanglyng styles. Generated by 54 _initialize_demangler from libiberty_demanglers[] array. */ 55 56 static const char **demangling_style_names; 57 static void 58 show_demangling_style_names(struct ui_file *file, int from_tty, 59 struct cmd_list_element *c, const char *value) 60 { 61 fprintf_filtered (file, _("The current C++ demangling style is \"%s\".\n"), 62 value); 63 } 64 65 66 static void set_demangling_command (char *, int, struct cmd_list_element *); 67 68 /* Set current demangling style. Called by the "set demangle-style" 69 command after it has updated the current_demangling_style_string to 70 match what the user has entered. 71 72 If the user has entered a string that matches a known demangling style 73 name in the demanglers[] array then just leave the string alone and update 74 the current_demangling_style enum value to match. 75 76 If the user has entered a string that doesn't match, including an empty 77 string, then print a list of the currently known styles and restore 78 the current_demangling_style_string to match the current_demangling_style 79 enum value. 80 81 Note: Assumes that current_demangling_style_string always points to 82 a malloc'd string, even if it is a null-string. */ 83 84 static void 85 set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c) 86 { 87 const struct demangler_engine *dem; 88 89 /* First just try to match whatever style name the user supplied with 90 one of the known ones. Don't bother special casing for an empty 91 name, we just treat it as any other style name that doesn't match. 92 If we match, update the current demangling style enum. */ 93 94 for (dem = libiberty_demanglers; 95 dem->demangling_style != unknown_demangling; 96 dem++) 97 { 98 if (strcmp (current_demangling_style_string, 99 dem->demangling_style_name) == 0) 100 { 101 current_demangling_style = dem->demangling_style; 102 break; 103 } 104 } 105 106 /* Check to see if we found a match. If not, gripe about any non-empty 107 style name and supply a list of valid ones. FIXME: This should 108 probably be done with some sort of completion and with help. */ 109 110 if (dem->demangling_style == unknown_demangling) 111 { 112 if (*current_demangling_style_string != '\0') 113 { 114 printf_unfiltered (_("Unknown demangling style `%s'.\n"), 115 current_demangling_style_string); 116 } 117 printf_unfiltered (_("The currently understood settings are:\n\n")); 118 for (dem = libiberty_demanglers; 119 dem->demangling_style != unknown_demangling; 120 dem++) 121 { 122 printf_unfiltered ("%-10s %s\n", dem->demangling_style_name, 123 dem->demangling_style_doc); 124 if (dem->demangling_style == current_demangling_style) 125 { 126 xfree (current_demangling_style_string); 127 current_demangling_style_string = 128 xstrdup (dem->demangling_style_name); 129 } 130 } 131 if (current_demangling_style == unknown_demangling) 132 { 133 /* This can happen during initialization if gdb is compiled with 134 a DEMANGLING_STYLE value that is unknown, so pick the first 135 one as the default. */ 136 current_demangling_style = libiberty_demanglers[0].demangling_style; 137 current_demangling_style_string = 138 xstrdup (libiberty_demanglers[0].demangling_style_name); 139 warning (_("`%s' style demangling chosen as the default."), 140 current_demangling_style_string); 141 } 142 } 143 } 144 145 /* Fake a "set demangle-style" command. */ 146 147 void 148 set_demangling_style (char *style) 149 { 150 if (current_demangling_style_string != NULL) 151 { 152 xfree (current_demangling_style_string); 153 } 154 current_demangling_style_string = xstrdup (style); 155 set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL); 156 } 157 158 /* G++ uses a special character to indicate certain internal names. Which 159 character it is depends on the platform: 160 - Usually '$' on systems where the assembler will accept that 161 - Usually '.' otherwise (this includes most sysv4-like systems and most 162 ELF targets) 163 - Occasionally '_' if neither of the above is usable 164 165 We check '$' first because it is the safest, and '.' often has another 166 meaning. We don't currently try to handle '_' because the precise forms 167 of the names are different on those targets. */ 168 169 static char cplus_markers[] = {'$', '.', '\0'}; 170 171 int 172 is_cplus_marker (int c) 173 { 174 return c && strchr (cplus_markers, c) != NULL; 175 } 176 177 void 178 _initialize_demangler (void) 179 { 180 int i, ndems; 181 182 /* Fill the demangling_style_names[] array. */ 183 for (ndems = 0; 184 libiberty_demanglers[ndems].demangling_style != unknown_demangling; 185 ndems++) 186 ; 187 demangling_style_names = xcalloc (ndems + 1, sizeof (char *)); 188 for (i = 0; 189 libiberty_demanglers[i].demangling_style != unknown_demangling; 190 i++) 191 demangling_style_names[i] = 192 xstrdup (libiberty_demanglers[i].demangling_style_name); 193 194 /* FIXME: cagney/2005-02-20: The code implementing this variable are 195 malloc-ing and free-ing current_demangling_style_string when it 196 should instead just point to an element of 197 demangling_style_names. */ 198 add_setshow_enum_cmd ("demangle-style", class_support, 199 demangling_style_names, 200 (const char **) ¤t_demangling_style_string, _("\ 201 Set the current C++ demangling style."), _("\ 202 Show the current C++ demangling style."), _("\ 203 Use `set demangle-style' without arguments for a list of demangling styles."), 204 set_demangling_command, 205 show_demangling_style_names, 206 &setlist, &showlist); 207 208 /* Set the default demangling style chosen at compilation time. */ 209 set_demangling_style (DEFAULT_DEMANGLING_STYLE); 210 } 211