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7b51bc51 | 1 | # Pretty-printer commands. |
32d0add0 | 2 | # Copyright (C) 2010-2015 Free Software Foundation, Inc. |
7b51bc51 DE |
3 | |
4 | # This program is free software; you can redistribute it and/or modify | |
5 | # it under the terms of the GNU General Public License as published by | |
6 | # the Free Software Foundation; either version 3 of the License, or | |
7 | # (at your option) any later version. | |
8 | # | |
9 | # This program is distributed in the hope that it will be useful, | |
10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | # GNU General Public License for more details. | |
13 | # | |
14 | # You should have received a copy of the GNU General Public License | |
15 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | ||
17 | """GDB commands for working with pretty-printers.""" | |
18 | ||
19 | import copy | |
20 | import gdb | |
21 | import re | |
22 | ||
23 | ||
24 | def parse_printer_regexps(arg): | |
25 | """Internal utility to parse a pretty-printer command argv. | |
26 | ||
27 | Arguments: | |
28 | arg: The arguments to the command. The format is: | |
29 | [object-regexp [name-regexp]]. | |
30 | Individual printers in a collection are named as | |
4e04c971 | 31 | printer-name;subprinter-name. |
7b51bc51 DE |
32 | |
33 | Returns: | |
34 | The result is a 3-tuple of compiled regular expressions, except that | |
35 | the resulting compiled subprinter regexp is None if not provided. | |
36 | ||
37 | Raises: | |
38 | SyntaxError: an error processing ARG | |
39 | """ | |
40 | ||
41 | argv = gdb.string_to_argv(arg); | |
42 | argc = len(argv) | |
43 | object_regexp = "" # match everything | |
44 | name_regexp = "" # match everything | |
45 | subname_regexp = None | |
46 | if argc > 3: | |
47 | raise SyntaxError("too many arguments") | |
48 | if argc >= 1: | |
49 | object_regexp = argv[0] | |
50 | if argc >= 2: | |
4e04c971 | 51 | name_subname = argv[1].split(";", 1) |
7b51bc51 DE |
52 | name_regexp = name_subname[0] |
53 | if len(name_subname) == 2: | |
54 | subname_regexp = name_subname[1] | |
55 | # That re.compile raises SyntaxError was determined empirically. | |
56 | # We catch it and reraise it to provide a slightly more useful | |
57 | # error message for the user. | |
58 | try: | |
59 | object_re = re.compile(object_regexp) | |
60 | except SyntaxError: | |
61 | raise SyntaxError("invalid object regexp: %s" % object_regexp) | |
62 | try: | |
63 | name_re = re.compile (name_regexp) | |
64 | except SyntaxError: | |
65 | raise SyntaxError("invalid name regexp: %s" % name_regexp) | |
66 | if subname_regexp is not None: | |
67 | try: | |
68 | subname_re = re.compile(subname_regexp) | |
69 | except SyntaxError: | |
70 | raise SyntaxError("invalid subname regexp: %s" % subname_regexp) | |
71 | else: | |
72 | subname_re = None | |
73 | return(object_re, name_re, subname_re) | |
74 | ||
75 | ||
76 | def printer_enabled_p(printer): | |
77 | """Internal utility to see if printer (or subprinter) is enabled.""" | |
78 | if hasattr(printer, "enabled"): | |
79 | return printer.enabled | |
80 | else: | |
81 | return True | |
82 | ||
83 | ||
84 | class InfoPrettyPrinter(gdb.Command): | |
85 | """GDB command to list all registered pretty-printers. | |
86 | ||
87 | Usage: info pretty-printer [object-regexp [name-regexp]] | |
88 | ||
89 | OBJECT-REGEXP is a regular expression matching the objects to list. | |
90 | Objects are "global", the program space's file, and the objfiles within | |
91 | that program space. | |
92 | ||
93 | NAME-REGEXP matches the name of the pretty-printer. | |
94 | Individual printers in a collection are named as | |
4e04c971 | 95 | printer-name;subprinter-name. |
7b51bc51 DE |
96 | """ |
97 | ||
98 | def __init__ (self): | |
99 | super(InfoPrettyPrinter, self).__init__("info pretty-printer", | |
100 | gdb.COMMAND_DATA) | |
101 | ||
102 | @staticmethod | |
103 | def enabled_string(printer): | |
104 | """Return "" if PRINTER is enabled, otherwise " [disabled]".""" | |
105 | if printer_enabled_p(printer): | |
106 | return "" | |
107 | else: | |
108 | return " [disabled]" | |
109 | ||
110 | @staticmethod | |
111 | def printer_name(printer): | |
112 | """Return the printer's name.""" | |
113 | if hasattr(printer, "name"): | |
114 | return printer.name | |
115 | if hasattr(printer, "__name__"): | |
116 | return printer.__name__ | |
117 | # This "shouldn't happen", but the public API allows for | |
118 | # direct additions to the pretty-printer list, and we shouldn't | |
119 | # crash because someone added a bogus printer. | |
120 | # Plus we want to give the user a way to list unknown printers. | |
121 | return "unknown" | |
122 | ||
123 | def list_pretty_printers(self, pretty_printers, name_re, subname_re): | |
124 | """Print a list of pretty-printers.""" | |
125 | # A potential enhancement is to provide an option to list printers in | |
126 | # "lookup order" (i.e. unsorted). | |
9a27f2c6 PK |
127 | sorted_pretty_printers = sorted (copy.copy(pretty_printers), |
128 | key = self.printer_name) | |
7b51bc51 DE |
129 | for printer in sorted_pretty_printers: |
130 | name = self.printer_name(printer) | |
131 | enabled = self.enabled_string(printer) | |
132 | if name_re.match(name): | |
9a27f2c6 | 133 | print (" %s%s" % (name, enabled)) |
7b51bc51 DE |
134 | if (hasattr(printer, "subprinters") and |
135 | printer.subprinters is not None): | |
9a27f2c6 PK |
136 | sorted_subprinters = sorted (copy.copy(printer.subprinters), |
137 | key = self.printer_name) | |
7b51bc51 DE |
138 | for subprinter in sorted_subprinters: |
139 | if (not subname_re or | |
140 | subname_re.match(subprinter.name)): | |
141 | print (" %s%s" % | |
142 | (subprinter.name, | |
143 | self.enabled_string(subprinter))) | |
144 | ||
145 | def invoke1(self, title, printer_list, | |
146 | obj_name_to_match, object_re, name_re, subname_re): | |
75c8c9d7 | 147 | """Subroutine of invoke to simplify it.""" |
7b51bc51 | 148 | if printer_list and object_re.match(obj_name_to_match): |
9a27f2c6 | 149 | print (title) |
7b51bc51 DE |
150 | self.list_pretty_printers(printer_list, name_re, subname_re) |
151 | ||
152 | def invoke(self, arg, from_tty): | |
153 | """GDB calls this to perform the command.""" | |
154 | (object_re, name_re, subname_re) = parse_printer_regexps(arg) | |
155 | self.invoke1("global pretty-printers:", gdb.pretty_printers, | |
156 | "global", object_re, name_re, subname_re) | |
157 | cp = gdb.current_progspace() | |
158 | self.invoke1("progspace %s pretty-printers:" % cp.filename, | |
159 | cp.pretty_printers, "progspace", | |
160 | object_re, name_re, subname_re) | |
161 | for objfile in gdb.objfiles(): | |
162 | self.invoke1(" objfile %s pretty-printers:" % objfile.filename, | |
163 | objfile.pretty_printers, objfile.filename, | |
164 | object_re, name_re, subname_re) | |
165 | ||
166 | ||
167 | def count_enabled_printers(pretty_printers): | |
168 | """Return a 2-tuple of number of enabled and total printers.""" | |
169 | enabled = 0 | |
170 | total = 0 | |
171 | for printer in pretty_printers: | |
172 | if (hasattr(printer, "subprinters") | |
173 | and printer.subprinters is not None): | |
174 | if printer_enabled_p(printer): | |
175 | for subprinter in printer.subprinters: | |
176 | if printer_enabled_p(subprinter): | |
177 | enabled += 1 | |
178 | total += len(printer.subprinters) | |
179 | else: | |
180 | if printer_enabled_p(printer): | |
181 | enabled += 1 | |
182 | total += 1 | |
183 | return (enabled, total) | |
184 | ||
185 | ||
186 | def count_all_enabled_printers(): | |
187 | """Return a 2-tuble of the enabled state and total number of all printers. | |
188 | This includes subprinters. | |
189 | """ | |
190 | enabled_count = 0 | |
191 | total_count = 0 | |
192 | (t_enabled, t_total) = count_enabled_printers(gdb.pretty_printers) | |
193 | enabled_count += t_enabled | |
194 | total_count += t_total | |
195 | (t_enabled, t_total) = count_enabled_printers(gdb.current_progspace().pretty_printers) | |
196 | enabled_count += t_enabled | |
197 | total_count += t_total | |
198 | for objfile in gdb.objfiles(): | |
199 | (t_enabled, t_total) = count_enabled_printers(objfile.pretty_printers) | |
200 | enabled_count += t_enabled | |
201 | total_count += t_total | |
202 | return (enabled_count, total_count) | |
203 | ||
204 | ||
205 | def pluralize(text, n, suffix="s"): | |
206 | """Return TEXT pluralized if N != 1.""" | |
207 | if n != 1: | |
208 | return "%s%s" % (text, suffix) | |
209 | else: | |
210 | return text | |
211 | ||
212 | ||
213 | def show_pretty_printer_enabled_summary(): | |
214 | """Print the number of printers enabled/disabled. | |
215 | We count subprinters individually. | |
216 | """ | |
217 | (enabled_count, total_count) = count_all_enabled_printers() | |
9a27f2c6 | 218 | print ("%d of %d printers enabled" % (enabled_count, total_count)) |
7b51bc51 DE |
219 | |
220 | ||
221 | def do_enable_pretty_printer_1 (pretty_printers, name_re, subname_re, flag): | |
222 | """Worker for enabling/disabling pretty-printers. | |
223 | ||
224 | Arguments: | |
225 | pretty_printers: list of pretty-printers | |
226 | name_re: regular-expression object to select printers | |
227 | subname_re: regular expression object to select subprinters or None | |
228 | if all are affected | |
229 | flag: True for Enable, False for Disable | |
230 | ||
231 | Returns: | |
232 | The number of printers affected. | |
233 | This is just for informational purposes for the user. | |
234 | """ | |
235 | total = 0 | |
236 | for printer in pretty_printers: | |
237 | if (hasattr(printer, "name") and name_re.match(printer.name) or | |
238 | hasattr(printer, "__name__") and name_re.match(printer.__name__)): | |
f61a2da7 DE |
239 | if (hasattr(printer, "subprinters") and |
240 | printer.subprinters is not None): | |
7b51bc51 DE |
241 | if not subname_re: |
242 | # Only record printers that change state. | |
243 | if printer_enabled_p(printer) != flag: | |
244 | for subprinter in printer.subprinters: | |
245 | if printer_enabled_p(subprinter): | |
246 | total += 1 | |
247 | # NOTE: We preserve individual subprinter settings. | |
248 | printer.enabled = flag | |
249 | else: | |
250 | # NOTE: Whether this actually disables the subprinter | |
251 | # depends on whether the printer's lookup function supports | |
252 | # the "enable" API. We can only assume it does. | |
253 | for subprinter in printer.subprinters: | |
254 | if subname_re.match(subprinter.name): | |
255 | # Only record printers that change state. | |
256 | if (printer_enabled_p(printer) and | |
257 | printer_enabled_p(subprinter) != flag): | |
258 | total += 1 | |
259 | subprinter.enabled = flag | |
260 | else: | |
261 | # This printer has no subprinters. | |
262 | # If the user does "disable pretty-printer .* .* foo" | |
263 | # should we disable printers that don't have subprinters? | |
264 | # How do we apply "foo" in this context? Since there is no | |
265 | # "foo" subprinter it feels like we should skip this printer. | |
266 | # There's still the issue of how to handle | |
267 | # "disable pretty-printer .* .* .*", and every other variation | |
268 | # that can match everything. For now punt and only support | |
269 | # "disable pretty-printer .* .*" (i.e. subname is elided) | |
270 | # to disable everything. | |
271 | if not subname_re: | |
272 | # Only record printers that change state. | |
273 | if printer_enabled_p(printer) != flag: | |
274 | total += 1 | |
275 | printer.enabled = flag | |
276 | return total | |
277 | ||
278 | ||
279 | def do_enable_pretty_printer (arg, flag): | |
280 | """Internal worker for enabling/disabling pretty-printers.""" | |
281 | (object_re, name_re, subname_re) = parse_printer_regexps(arg) | |
282 | ||
283 | total = 0 | |
284 | if object_re.match("global"): | |
285 | total += do_enable_pretty_printer_1(gdb.pretty_printers, | |
286 | name_re, subname_re, flag) | |
287 | cp = gdb.current_progspace() | |
288 | if object_re.match("progspace"): | |
289 | total += do_enable_pretty_printer_1(cp.pretty_printers, | |
290 | name_re, subname_re, flag) | |
291 | for objfile in gdb.objfiles(): | |
292 | if object_re.match(objfile.filename): | |
293 | total += do_enable_pretty_printer_1(objfile.pretty_printers, | |
294 | name_re, subname_re, flag) | |
295 | ||
296 | if flag: | |
297 | state = "enabled" | |
298 | else: | |
299 | state = "disabled" | |
9a27f2c6 | 300 | print ("%d %s %s" % (total, pluralize("printer", total), state)) |
7b51bc51 DE |
301 | |
302 | # Print the total list of printers currently enabled/disabled. | |
303 | # This is to further assist the user in determining whether the result | |
304 | # is expected. Since we use regexps to select it's useful. | |
305 | show_pretty_printer_enabled_summary() | |
306 | ||
307 | ||
308 | # Enable/Disable one or more pretty-printers. | |
309 | # | |
310 | # This is intended for use when a broken pretty-printer is shipped/installed | |
311 | # and the user wants to disable that printer without disabling all the other | |
312 | # printers. | |
313 | # | |
314 | # A useful addition would be -v (verbose) to show each printer affected. | |
315 | ||
316 | class EnablePrettyPrinter (gdb.Command): | |
317 | """GDB command to enable the specified pretty-printer. | |
318 | ||
319 | Usage: enable pretty-printer [object-regexp [name-regexp]] | |
320 | ||
321 | OBJECT-REGEXP is a regular expression matching the objects to examine. | |
322 | Objects are "global", the program space's file, and the objfiles within | |
323 | that program space. | |
324 | ||
325 | NAME-REGEXP matches the name of the pretty-printer. | |
326 | Individual printers in a collection are named as | |
4e04c971 | 327 | printer-name;subprinter-name. |
7b51bc51 DE |
328 | """ |
329 | ||
330 | def __init__(self): | |
331 | super(EnablePrettyPrinter, self).__init__("enable pretty-printer", | |
332 | gdb.COMMAND_DATA) | |
333 | ||
334 | def invoke(self, arg, from_tty): | |
335 | """GDB calls this to perform the command.""" | |
336 | do_enable_pretty_printer(arg, True) | |
337 | ||
338 | ||
339 | class DisablePrettyPrinter (gdb.Command): | |
340 | """GDB command to disable the specified pretty-printer. | |
341 | ||
342 | Usage: disable pretty-printer [object-regexp [name-regexp]] | |
343 | ||
344 | OBJECT-REGEXP is a regular expression matching the objects to examine. | |
345 | Objects are "global", the program space's file, and the objfiles within | |
346 | that program space. | |
347 | ||
348 | NAME-REGEXP matches the name of the pretty-printer. | |
349 | Individual printers in a collection are named as | |
4e04c971 | 350 | printer-name;subprinter-name. |
7b51bc51 DE |
351 | """ |
352 | ||
353 | def __init__(self): | |
354 | super(DisablePrettyPrinter, self).__init__("disable pretty-printer", | |
355 | gdb.COMMAND_DATA) | |
356 | ||
357 | def invoke(self, arg, from_tty): | |
358 | """GDB calls this to perform the command.""" | |
359 | do_enable_pretty_printer(arg, False) | |
360 | ||
361 | ||
362 | def register_pretty_printer_commands(): | |
363 | """Call from a top level script to install the pretty-printer commands.""" | |
364 | InfoPrettyPrinter() | |
365 | EnablePrettyPrinter() | |
366 | DisablePrettyPrinter() | |
5e239b84 PM |
367 | |
368 | register_pretty_printer_commands() |