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c906108c | 1 | /* Basic C++ demangling support for GDB. |
1bac305b | 2 | |
28e7fd62 | 3 | Copyright (C) 1991-2013 Free Software Foundation, Inc. |
1bac305b | 4 | |
c906108c SS |
5 | Written by Fred Fish at Cygnus Support. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c906108c SS |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | ||
23 | /* This file contains support code for C++ demangling that is common | |
0963b4bd | 24 | to a styles of demangling, and GDB specific. */ |
c906108c SS |
25 | |
26 | #include "defs.h" | |
27 | #include "command.h" | |
28 | #include "gdbcmd.h" | |
29 | #include "demangle.h" | |
50f182aa | 30 | #include "gdb-demangle.h" |
c906108c SS |
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 | |
0963b4bd | 39 | the appropriate target configuration file. */ |
c906108c SS |
40 | |
41 | #ifndef DEFAULT_DEMANGLING_STYLE | |
42 | #define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING | |
43 | #endif | |
44 | ||
50f182aa DE |
45 | /* See documentation in gdb-demangle.h. */ |
46 | int demangle = 1; | |
47 | ||
48 | static void | |
49 | show_demangle (struct ui_file *file, int from_tty, | |
50 | struct cmd_list_element *c, const char *value) | |
51 | { | |
52 | fprintf_filtered (file, | |
53 | _("Demangling of encoded C++/ObjC names " | |
54 | "when displaying symbols is %s.\n"), | |
55 | value); | |
56 | } | |
57 | ||
58 | /* See documentation in gdb-demangle.h. */ | |
59 | int asm_demangle = 0; | |
60 | ||
61 | static void | |
62 | show_asm_demangle (struct ui_file *file, int from_tty, | |
63 | struct cmd_list_element *c, const char *value) | |
64 | { | |
65 | fprintf_filtered (file, | |
66 | _("Demangling of C++/ObjC names in " | |
67 | "disassembly listings is %s.\n"), | |
68 | value); | |
69 | } | |
392a587b | 70 | |
c906108c SS |
71 | /* String name for the current demangling style. Set by the |
72 | "set demangle-style" command, printed as part of the output by the | |
0963b4bd | 73 | "show demangle-style" command. */ |
c906108c SS |
74 | |
75 | static char *current_demangling_style_string; | |
76 | ||
fa58ee11 EZ |
77 | /* The array of names of the known demanglyng styles. Generated by |
78 | _initialize_demangler from libiberty_demanglers[] array. */ | |
79 | ||
80 | static const char **demangling_style_names; | |
920d2a44 AC |
81 | static void |
82 | show_demangling_style_names(struct ui_file *file, int from_tty, | |
83 | struct cmd_list_element *c, const char *value) | |
84 | { | |
85 | fprintf_filtered (file, _("The current C++ demangling style is \"%s\".\n"), | |
86 | value); | |
87 | } | |
88 | ||
c906108c SS |
89 | /* Set current demangling style. Called by the "set demangle-style" |
90 | command after it has updated the current_demangling_style_string to | |
91 | match what the user has entered. | |
92 | ||
93 | If the user has entered a string that matches a known demangling style | |
94 | name in the demanglers[] array then just leave the string alone and update | |
95 | the current_demangling_style enum value to match. | |
96 | ||
97 | If the user has entered a string that doesn't match, including an empty | |
98 | string, then print a list of the currently known styles and restore | |
99 | the current_demangling_style_string to match the current_demangling_style | |
100 | enum value. | |
101 | ||
102 | Note: Assumes that current_demangling_style_string always points to | |
0963b4bd | 103 | a malloc'd string, even if it is a null-string. */ |
c906108c SS |
104 | |
105 | static void | |
fba45db2 | 106 | set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c) |
c906108c | 107 | { |
770de199 | 108 | const struct demangler_engine *dem; |
c906108c SS |
109 | |
110 | /* First just try to match whatever style name the user supplied with | |
111 | one of the known ones. Don't bother special casing for an empty | |
112 | name, we just treat it as any other style name that doesn't match. | |
0963b4bd | 113 | If we match, update the current demangling style enum. */ |
c906108c | 114 | |
770de199 DB |
115 | for (dem = libiberty_demanglers; |
116 | dem->demangling_style != unknown_demangling; | |
117 | dem++) | |
c906108c | 118 | { |
bde58177 AC |
119 | if (strcmp (current_demangling_style_string, |
120 | dem->demangling_style_name) == 0) | |
c906108c SS |
121 | { |
122 | current_demangling_style = dem->demangling_style; | |
123 | break; | |
124 | } | |
125 | } | |
126 | ||
127 | /* Check to see if we found a match. If not, gripe about any non-empty | |
0963b4bd MS |
128 | style name and supply a list of valid ones. FIXME: This should |
129 | probably be done with some sort of completion and with help. */ | |
c906108c | 130 | |
770de199 | 131 | if (dem->demangling_style == unknown_demangling) |
c906108c SS |
132 | { |
133 | if (*current_demangling_style_string != '\0') | |
134 | { | |
a3f17187 | 135 | printf_unfiltered (_("Unknown demangling style `%s'.\n"), |
c906108c SS |
136 | current_demangling_style_string); |
137 | } | |
a3f17187 | 138 | printf_unfiltered (_("The currently understood settings are:\n\n")); |
770de199 DB |
139 | for (dem = libiberty_demanglers; |
140 | dem->demangling_style != unknown_demangling; | |
141 | dem++) | |
c906108c SS |
142 | { |
143 | printf_unfiltered ("%-10s %s\n", dem->demangling_style_name, | |
144 | dem->demangling_style_doc); | |
145 | if (dem->demangling_style == current_demangling_style) | |
146 | { | |
b8c9b27d | 147 | xfree (current_demangling_style_string); |
c906108c | 148 | current_demangling_style_string = |
1b36a34b | 149 | xstrdup (dem->demangling_style_name); |
c906108c SS |
150 | } |
151 | } | |
152 | if (current_demangling_style == unknown_demangling) | |
153 | { | |
154 | /* This can happen during initialization if gdb is compiled with | |
155 | a DEMANGLING_STYLE value that is unknown, so pick the first | |
0963b4bd | 156 | one as the default. */ |
770de199 | 157 | current_demangling_style = libiberty_demanglers[0].demangling_style; |
c906108c | 158 | current_demangling_style_string = |
1b36a34b | 159 | xstrdup (libiberty_demanglers[0].demangling_style_name); |
8a3fe4f8 | 160 | warning (_("`%s' style demangling chosen as the default."), |
c906108c SS |
161 | current_demangling_style_string); |
162 | } | |
163 | } | |
164 | } | |
165 | ||
50f182aa | 166 | /* See documentation in gdb-demangle.h. */ |
c906108c SS |
167 | |
168 | void | |
fba45db2 | 169 | set_demangling_style (char *style) |
c906108c SS |
170 | { |
171 | if (current_demangling_style_string != NULL) | |
172 | { | |
b8c9b27d | 173 | xfree (current_demangling_style_string); |
c906108c | 174 | } |
1b36a34b | 175 | current_demangling_style_string = xstrdup (style); |
c906108c SS |
176 | set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL); |
177 | } | |
178 | ||
8343f86c DJ |
179 | /* G++ uses a special character to indicate certain internal names. Which |
180 | character it is depends on the platform: | |
181 | - Usually '$' on systems where the assembler will accept that | |
182 | - Usually '.' otherwise (this includes most sysv4-like systems and most | |
183 | ELF targets) | |
184 | - Occasionally '_' if neither of the above is usable | |
185 | ||
186 | We check '$' first because it is the safest, and '.' often has another | |
187 | meaning. We don't currently try to handle '_' because the precise forms | |
188 | of the names are different on those targets. */ | |
189 | ||
190 | static char cplus_markers[] = {'$', '.', '\0'}; | |
c906108c | 191 | |
50f182aa DE |
192 | /* See documentation in gdb-demangle.h. */ |
193 | ||
c906108c | 194 | int |
fba45db2 | 195 | is_cplus_marker (int c) |
c906108c SS |
196 | { |
197 | return c && strchr (cplus_markers, c) != NULL; | |
198 | } | |
199 | ||
50f182aa DE |
200 | extern initialize_file_ftype _initialize_demangler; /* -Wmissing-prototypes */ |
201 | ||
c906108c | 202 | void |
fba45db2 | 203 | _initialize_demangler (void) |
c906108c | 204 | { |
fa58ee11 EZ |
205 | int i, ndems; |
206 | ||
207 | /* Fill the demangling_style_names[] array. */ | |
208 | for (ndems = 0; | |
209 | libiberty_demanglers[ndems].demangling_style != unknown_demangling; | |
210 | ndems++) | |
211 | ; | |
9e0c176c | 212 | demangling_style_names = xcalloc (ndems + 1, sizeof (char *)); |
fa58ee11 EZ |
213 | for (i = 0; |
214 | libiberty_demanglers[i].demangling_style != unknown_demangling; | |
215 | i++) | |
216 | demangling_style_names[i] = | |
217 | xstrdup (libiberty_demanglers[i].demangling_style_name); | |
218 | ||
50f182aa DE |
219 | add_setshow_boolean_cmd ("demangle", class_support, &demangle, _("\ |
220 | Set demangling of encoded C++/ObjC names when displaying symbols."), _("\ | |
221 | Show demangling of encoded C++/ObjC names when displaying symbols."), NULL, | |
222 | NULL, | |
223 | show_demangle, | |
224 | &setprintlist, &showprintlist); | |
225 | ||
226 | add_setshow_boolean_cmd ("asm-demangle", class_support, &asm_demangle, _("\ | |
227 | Set demangling of C++/ObjC names in disassembly listings."), _("\ | |
228 | Show demangling of C++/ObjC names in disassembly listings."), NULL, | |
229 | NULL, | |
230 | show_asm_demangle, | |
231 | &setprintlist, &showprintlist); | |
232 | ||
7ab04401 AC |
233 | /* FIXME: cagney/2005-02-20: The code implementing this variable are |
234 | malloc-ing and free-ing current_demangling_style_string when it | |
235 | should instead just point to an element of | |
236 | demangling_style_names. */ | |
237 | add_setshow_enum_cmd ("demangle-style", class_support, | |
238 | demangling_style_names, | |
239 | (const char **) ¤t_demangling_style_string, _("\ | |
240 | Set the current C++ demangling style."), _("\ | |
241 | Show the current C++ demangling style."), _("\ | |
242 | Use `set demangle-style' without arguments for a list of demangling styles."), | |
243 | set_demangling_command, | |
920d2a44 | 244 | show_demangling_style_names, |
7ab04401 | 245 | &setlist, &showlist); |
c906108c | 246 | |
0963b4bd | 247 | /* Set the default demangling style chosen at compilation time. */ |
c906108c | 248 | set_demangling_style (DEFAULT_DEMANGLING_STYLE); |
c906108c | 249 | } |