1/* Basic C++ demangling support for GDB. 2 3 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 4 2001, 2003 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 2 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, write to the Free Software 22 Foundation, Inc., 59 Temple Place - Suite 330, 23 Boston, MA 02111-1307, USA. */ 24 25 26/* This file contains support code for C++ demangling that is common 27 to a styles of demangling, and GDB specific. */ 28 29#include "defs.h" 30#include "command.h" 31#include "gdbcmd.h" 32#include "demangle.h" 33#include "gdb_string.h" 34 35/* Select the default C++ demangling style to use. The default is "auto", 36 which allows gdb to attempt to pick an appropriate demangling style for 37 the executable it has loaded. It can be set to a specific style ("gnu", 38 "lucid", "arm", "hp", etc.) in which case gdb will never attempt to do auto 39 selection of the style unless you do an explicit "set demangle auto". 40 To select one of these as the default, set DEFAULT_DEMANGLING_STYLE in 41 the appropriate target configuration file. */ 42 43#ifndef DEFAULT_DEMANGLING_STYLE 44#define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING 45#endif 46 47extern void _initialize_demangler (void); 48 49/* String name for the current demangling style. Set by the 50 "set demangle-style" command, printed as part of the output by the 51 "show demangle-style" command. */ 52 53static char *current_demangling_style_string; 54 55/* The array of names of the known demanglyng styles. Generated by 56 _initialize_demangler from libiberty_demanglers[] array. */ 57 58static const char **demangling_style_names; 59 60static void set_demangling_command (char *, int, struct cmd_list_element *); 61 62/* Set current demangling style. Called by the "set demangle-style" 63 command after it has updated the current_demangling_style_string to 64 match what the user has entered. 65 66 If the user has entered a string that matches a known demangling style 67 name in the demanglers[] array then just leave the string alone and update 68 the current_demangling_style enum value to match. 69 70 If the user has entered a string that doesn't match, including an empty 71 string, then print a list of the currently known styles and restore 72 the current_demangling_style_string to match the current_demangling_style 73 enum value. 74 75 Note: Assumes that current_demangling_style_string always points to 76 a malloc'd string, even if it is a null-string. */ 77 78static void 79set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c) 80{ 81 const struct demangler_engine *dem; 82 83 /* First just try to match whatever style name the user supplied with 84 one of the known ones. Don't bother special casing for an empty 85 name, we just treat it as any other style name that doesn't match. 86 If we match, update the current demangling style enum. */ 87 88 for (dem = libiberty_demanglers; 89 dem->demangling_style != unknown_demangling; 90 dem++) 91 { 92 if (strcmp (current_demangling_style_string, 93 dem->demangling_style_name) == 0) 94 { 95 current_demangling_style = dem->demangling_style; 96 break; 97 } 98 } 99 100 /* Check to see if we found a match. If not, gripe about any non-empty 101 style name and supply a list of valid ones. FIXME: This should 102 probably be done with some sort of completion and with help. */ 103 104 if (dem->demangling_style == unknown_demangling) 105 { 106 if (*current_demangling_style_string != '\0') 107 { 108 printf_unfiltered ("Unknown demangling style `%s'.\n", 109 current_demangling_style_string); 110 } 111 printf_unfiltered ("The currently understood settings are:\n\n"); 112 for (dem = libiberty_demanglers; 113 dem->demangling_style != unknown_demangling; 114 dem++) 115 { 116 printf_unfiltered ("%-10s %s\n", dem->demangling_style_name, 117 dem->demangling_style_doc); 118 if (dem->demangling_style == current_demangling_style) 119 { 120 xfree (current_demangling_style_string); 121 current_demangling_style_string = 122 savestring (dem->demangling_style_name, 123 strlen (dem->demangling_style_name)); 124 } 125 } 126 if (current_demangling_style == unknown_demangling) 127 { 128 /* This can happen during initialization if gdb is compiled with 129 a DEMANGLING_STYLE value that is unknown, so pick the first 130 one as the default. */ 131 current_demangling_style = libiberty_demanglers[0].demangling_style; 132 current_demangling_style_string = 133 savestring ( 134 libiberty_demanglers[0].demangling_style_name, 135 strlen (libiberty_demanglers[0].demangling_style_name)); 136 warning ("`%s' style demangling chosen as the default.\n", 137 current_demangling_style_string); 138 } 139 } 140} 141 142/* Fake a "set demangle-style" command. */ 143 144void 145set_demangling_style (char *style) 146{ 147 if (current_demangling_style_string != NULL) 148 { 149 xfree (current_demangling_style_string); 150 } 151 current_demangling_style_string = savestring (style, strlen (style)); 152 set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL); 153} 154 155/* G++ uses a special character to indicate certain internal names. Which 156 character it is depends on the platform: 157 - Usually '$' on systems where the assembler will accept that 158 - Usually '.' otherwise (this includes most sysv4-like systems and most 159 ELF targets) 160 - Occasionally '_' if neither of the above is usable 161 162 We check '$' first because it is the safest, and '.' often has another 163 meaning. We don't currently try to handle '_' because the precise forms 164 of the names are different on those targets. */ 165 166static char cplus_markers[] = {'$', '.', '\0'}; 167 168int 169is_cplus_marker (int c) 170{ 171 return c && strchr (cplus_markers, c) != NULL; 172} 173 174void 175_initialize_demangler (void) 176{ 177 struct cmd_list_element *set, *show; 178 int i, ndems; 179 180 /* Fill the demangling_style_names[] array. */ 181 for (ndems = 0; 182 libiberty_demanglers[ndems].demangling_style != unknown_demangling; 183 ndems++) 184 ; 185 demangling_style_names = xcalloc (ndems + 1, sizeof (char *)); 186 for (i = 0; 187 libiberty_demanglers[i].demangling_style != unknown_demangling; 188 i++) 189 demangling_style_names[i] = 190 xstrdup (libiberty_demanglers[i].demangling_style_name); 191 192 set = add_set_enum_cmd ("demangle-style", class_support, 193 demangling_style_names, 194 (const char **) ¤t_demangling_style_string, 195 "Set the current C++ demangling style.\n\ 196Use `set demangle-style' without arguments for a list of demangling styles.", 197 &setlist); 198 show = deprecated_add_show_from_set (set, &showlist); 199 set_cmd_sfunc (set, set_demangling_command); 200 201 /* Set the default demangling style chosen at compilation time. */ 202 set_demangling_style (DEFAULT_DEMANGLING_STYLE); 203} 204