1 /* Basic C++ demangling support for GDB.
3 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
4 2003, 2007 Free Software Foundation, Inc.
6 Written by Fred Fish at Cygnus Support.
8 This file is part of GDB.
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.
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 this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 Boston, MA 02110-1301, USA. */
26 /* This file contains support code for C++ demangling that is common
27 to a styles of demangling, and GDB specific. */
33 #include "gdb_string.h"
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. */
43 #ifndef DEFAULT_DEMANGLING_STYLE
44 #define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING
47 extern void _initialize_demangler (void);
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. */
53 static char *current_demangling_style_string;
55 /* The array of names of the known demanglyng styles. Generated by
56 _initialize_demangler from libiberty_demanglers[] array. */
58 static const char **demangling_style_names;
60 show_demangling_style_names(struct ui_file *file, int from_tty,
61 struct cmd_list_element *c, const char *value)
63 fprintf_filtered (file, _("The current C++ demangling style is \"%s\".\n"),
68 static void set_demangling_command (char *, int, struct cmd_list_element *);
70 /* Set current demangling style. Called by the "set demangle-style"
71 command after it has updated the current_demangling_style_string to
72 match what the user has entered.
74 If the user has entered a string that matches a known demangling style
75 name in the demanglers[] array then just leave the string alone and update
76 the current_demangling_style enum value to match.
78 If the user has entered a string that doesn't match, including an empty
79 string, then print a list of the currently known styles and restore
80 the current_demangling_style_string to match the current_demangling_style
83 Note: Assumes that current_demangling_style_string always points to
84 a malloc'd string, even if it is a null-string. */
87 set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c)
89 const struct demangler_engine *dem;
91 /* First just try to match whatever style name the user supplied with
92 one of the known ones. Don't bother special casing for an empty
93 name, we just treat it as any other style name that doesn't match.
94 If we match, update the current demangling style enum. */
96 for (dem = libiberty_demanglers;
97 dem->demangling_style != unknown_demangling;
100 if (strcmp (current_demangling_style_string,
101 dem->demangling_style_name) == 0)
103 current_demangling_style = dem->demangling_style;
108 /* Check to see if we found a match. If not, gripe about any non-empty
109 style name and supply a list of valid ones. FIXME: This should
110 probably be done with some sort of completion and with help. */
112 if (dem->demangling_style == unknown_demangling)
114 if (*current_demangling_style_string != '\0')
116 printf_unfiltered (_("Unknown demangling style `%s'.\n"),
117 current_demangling_style_string);
119 printf_unfiltered (_("The currently understood settings are:\n\n"));
120 for (dem = libiberty_demanglers;
121 dem->demangling_style != unknown_demangling;
124 printf_unfiltered ("%-10s %s\n", dem->demangling_style_name,
125 dem->demangling_style_doc);
126 if (dem->demangling_style == current_demangling_style)
128 xfree (current_demangling_style_string);
129 current_demangling_style_string =
130 savestring (dem->demangling_style_name,
131 strlen (dem->demangling_style_name));
134 if (current_demangling_style == unknown_demangling)
136 /* This can happen during initialization if gdb is compiled with
137 a DEMANGLING_STYLE value that is unknown, so pick the first
138 one as the default. */
139 current_demangling_style = libiberty_demanglers[0].demangling_style;
140 current_demangling_style_string =
142 libiberty_demanglers[0].demangling_style_name,
143 strlen (libiberty_demanglers[0].demangling_style_name));
144 warning (_("`%s' style demangling chosen as the default."),
145 current_demangling_style_string);
150 /* Fake a "set demangle-style" command. */
153 set_demangling_style (char *style)
155 if (current_demangling_style_string != NULL)
157 xfree (current_demangling_style_string);
159 current_demangling_style_string = savestring (style, strlen (style));
160 set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL);
163 /* G++ uses a special character to indicate certain internal names. Which
164 character it is depends on the platform:
165 - Usually '$' on systems where the assembler will accept that
166 - Usually '.' otherwise (this includes most sysv4-like systems and most
168 - Occasionally '_' if neither of the above is usable
170 We check '$' first because it is the safest, and '.' often has another
171 meaning. We don't currently try to handle '_' because the precise forms
172 of the names are different on those targets. */
174 static char cplus_markers[] = {'$', '.', '\0'};
177 is_cplus_marker (int c)
179 return c && strchr (cplus_markers, c) != NULL;
183 _initialize_demangler (void)
185 struct cmd_list_element *set, *show;
188 /* Fill the demangling_style_names[] array. */
190 libiberty_demanglers[ndems].demangling_style != unknown_demangling;
193 demangling_style_names = xcalloc (ndems + 1, sizeof (char *));
195 libiberty_demanglers[i].demangling_style != unknown_demangling;
197 demangling_style_names[i] =
198 xstrdup (libiberty_demanglers[i].demangling_style_name);
200 /* FIXME: cagney/2005-02-20: The code implementing this variable are
201 malloc-ing and free-ing current_demangling_style_string when it
202 should instead just point to an element of
203 demangling_style_names. */
204 add_setshow_enum_cmd ("demangle-style", class_support,
205 demangling_style_names,
206 (const char **) ¤t_demangling_style_string, _("\
207 Set the current C++ demangling style."), _("\
208 Show the current C++ demangling style."), _("\
209 Use `set demangle-style' without arguments for a list of demangling styles."),
210 set_demangling_command,
211 show_demangling_style_names,
212 &setlist, &showlist);
214 /* Set the default demangling style chosen at compilation time. */
215 set_demangling_style (DEFAULT_DEMANGLING_STYLE);