1 /* Basic C++ demangling support for GDB.
3 Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
4 2003, 2007, 2008, 2009, 2010, 2011 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 3 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, see <http://www.gnu.org/licenses/>. */
24 /* This file contains support code for C++ demangling that is common
25 to a styles of demangling, and GDB specific. */
31 #include "gdb-demangle.h"
32 #include "gdb_string.h"
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. */
42 #ifndef DEFAULT_DEMANGLING_STYLE
43 #define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING
46 /* See documentation in gdb-demangle.h. */
50 show_demangle (struct ui_file *file, int from_tty,
51 struct cmd_list_element *c, const char *value)
53 fprintf_filtered (file,
54 _("Demangling of encoded C++/ObjC names "
55 "when displaying symbols is %s.\n"),
59 /* See documentation in gdb-demangle.h. */
63 show_asm_demangle (struct ui_file *file, int from_tty,
64 struct cmd_list_element *c, const char *value)
66 fprintf_filtered (file,
67 _("Demangling of C++/ObjC names in "
68 "disassembly listings is %s.\n"),
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. */
76 static char *current_demangling_style_string;
78 /* The array of names of the known demanglyng styles. Generated by
79 _initialize_demangler from libiberty_demanglers[] array. */
81 static const char **demangling_style_names;
83 show_demangling_style_names(struct ui_file *file, int from_tty,
84 struct cmd_list_element *c, const char *value)
86 fprintf_filtered (file, _("The current C++ demangling style is \"%s\".\n"),
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.
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.
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
103 Note: Assumes that current_demangling_style_string always points to
104 a malloc'd string, even if it is a null-string. */
107 set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c)
109 const struct demangler_engine *dem;
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. */
116 for (dem = libiberty_demanglers;
117 dem->demangling_style != unknown_demangling;
120 if (strcmp (current_demangling_style_string,
121 dem->demangling_style_name) == 0)
123 current_demangling_style = dem->demangling_style;
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. */
132 if (dem->demangling_style == unknown_demangling)
134 if (*current_demangling_style_string != '\0')
136 printf_unfiltered (_("Unknown demangling style `%s'.\n"),
137 current_demangling_style_string);
139 printf_unfiltered (_("The currently understood settings are:\n\n"));
140 for (dem = libiberty_demanglers;
141 dem->demangling_style != unknown_demangling;
144 printf_unfiltered ("%-10s %s\n", dem->demangling_style_name,
145 dem->demangling_style_doc);
146 if (dem->demangling_style == current_demangling_style)
148 xfree (current_demangling_style_string);
149 current_demangling_style_string =
150 xstrdup (dem->demangling_style_name);
153 if (current_demangling_style == unknown_demangling)
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);
167 /* See documentation in gdb-demangle.h. */
170 set_demangling_style (char *style)
172 if (current_demangling_style_string != NULL)
174 xfree (current_demangling_style_string);
176 current_demangling_style_string = xstrdup (style);
177 set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL);
180 /* G++ uses a special character to indicate certain internal names. Which
181 character it is depends on the platform:
182 - Usually '$' on systems where the assembler will accept that
183 - Usually '.' otherwise (this includes most sysv4-like systems and most
185 - Occasionally '_' if neither of the above is usable
187 We check '$' 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. */
191 static char cplus_markers[] = {'$', '.', '\0'};
193 /* See documentation in gdb-demangle.h. */
196 is_cplus_marker (int c)
198 return c && strchr (cplus_markers, c) != NULL;
201 extern initialize_file_ftype _initialize_demangler; /* -Wmissing-prototypes */
204 _initialize_demangler (void)
208 /* Fill the demangling_style_names[] array. */
210 libiberty_demanglers[ndems].demangling_style != unknown_demangling;
213 demangling_style_names = xcalloc (ndems + 1, sizeof (char *));
215 libiberty_demanglers[i].demangling_style != unknown_demangling;
217 demangling_style_names[i] =
218 xstrdup (libiberty_demanglers[i].demangling_style_name);
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,
225 &setprintlist, &showprintlist);
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,
232 &setprintlist, &showprintlist);
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);
248 /* Set the default demangling style chosen at compilation time. */
249 set_demangling_style (DEFAULT_DEMANGLING_STYLE);