| 1 | /* Support for complaint handling during symbol reading in GDB. |
| 2 | |
| 3 | Copyright (C) 1990-2015 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "complaints.h" |
| 22 | #include "command.h" |
| 23 | #include "gdbcmd.h" |
| 24 | |
| 25 | extern void _initialize_complaints (void); |
| 26 | |
| 27 | /* Should each complaint message be self explanatory, or should we |
| 28 | assume that a series of complaints is being produced? */ |
| 29 | |
| 30 | enum complaint_series { |
| 31 | /* Isolated self explanatory message. */ |
| 32 | ISOLATED_MESSAGE, |
| 33 | |
| 34 | /* First message of a series, includes an explanation. */ |
| 35 | FIRST_MESSAGE, |
| 36 | |
| 37 | /* First message of a series, but does not need to include any sort |
| 38 | of explanation. */ |
| 39 | SHORT_FIRST_MESSAGE, |
| 40 | |
| 41 | /* Subsequent message of a series that needs no explanation (the |
| 42 | user already knows we have a problem so we can just state our |
| 43 | piece). */ |
| 44 | SUBSEQUENT_MESSAGE |
| 45 | }; |
| 46 | |
| 47 | /* Structure to manage complaints about symbol file contents. */ |
| 48 | |
| 49 | struct complain |
| 50 | { |
| 51 | const char *file; |
| 52 | int line; |
| 53 | const char *fmt; |
| 54 | int counter; |
| 55 | struct complain *next; |
| 56 | }; |
| 57 | |
| 58 | /* The explanatory message that should accompany the complaint. The |
| 59 | message is in two parts - pre and post - that are printed around |
| 60 | the complaint text. */ |
| 61 | struct explanation |
| 62 | { |
| 63 | const char *prefix; |
| 64 | const char *postfix; |
| 65 | }; |
| 66 | |
| 67 | struct complaints |
| 68 | { |
| 69 | struct complain *root; |
| 70 | |
| 71 | enum complaint_series series; |
| 72 | |
| 73 | /* The explanatory messages that should accompany the complaint. |
| 74 | NOTE: cagney/2002-08-14: In a desperate attempt at being vaguely |
| 75 | i18n friendly, this is an array of two messages. When present, |
| 76 | the PRE and POST EXPLANATION[SERIES] are used to wrap the |
| 77 | message. */ |
| 78 | const struct explanation *explanation; |
| 79 | }; |
| 80 | |
| 81 | static struct complain complaint_sentinel; |
| 82 | |
| 83 | /* The symbol table complaint table. */ |
| 84 | |
| 85 | static struct explanation symfile_explanations[] = { |
| 86 | { "During symbol reading, ", "." }, |
| 87 | { "During symbol reading...", "..."}, |
| 88 | { "", "..."}, |
| 89 | { "", "..."}, |
| 90 | { NULL, NULL } |
| 91 | }; |
| 92 | |
| 93 | static struct complaints symfile_complaint_book = { |
| 94 | &complaint_sentinel, |
| 95 | ISOLATED_MESSAGE, |
| 96 | symfile_explanations |
| 97 | }; |
| 98 | struct complaints *symfile_complaints = &symfile_complaint_book; |
| 99 | |
| 100 | /* Wrapper function to, on-demand, fill in a complaints object. */ |
| 101 | |
| 102 | static struct complaints * |
| 103 | get_complaints (struct complaints **c) |
| 104 | { |
| 105 | if ((*c) != NULL) |
| 106 | return (*c); |
| 107 | (*c) = XNEW (struct complaints); |
| 108 | (*c)->root = &complaint_sentinel; |
| 109 | (*c)->series = ISOLATED_MESSAGE; |
| 110 | (*c)->explanation = NULL; |
| 111 | return (*c); |
| 112 | } |
| 113 | |
| 114 | static struct complain * ATTRIBUTE_PRINTF (4, 0) |
| 115 | find_complaint (struct complaints *complaints, const char *file, |
| 116 | int line, const char *fmt) |
| 117 | { |
| 118 | struct complain *complaint; |
| 119 | |
| 120 | /* Find the complaint in the table. A more efficient search |
| 121 | algorithm (based on hash table or something) could be used. But |
| 122 | that can wait until someone shows evidence that this lookup is |
| 123 | a real bottle neck. */ |
| 124 | for (complaint = complaints->root; |
| 125 | complaint != NULL; |
| 126 | complaint = complaint->next) |
| 127 | { |
| 128 | if (complaint->fmt == fmt |
| 129 | && complaint->file == file |
| 130 | && complaint->line == line) |
| 131 | return complaint; |
| 132 | } |
| 133 | |
| 134 | /* Oops not seen before, fill in a new complaint. */ |
| 135 | complaint = XNEW (struct complain); |
| 136 | complaint->fmt = fmt; |
| 137 | complaint->file = file; |
| 138 | complaint->line = line; |
| 139 | complaint->counter = 0; |
| 140 | complaint->next = NULL; |
| 141 | |
| 142 | /* File it, return it. */ |
| 143 | complaint->next = complaints->root; |
| 144 | complaints->root = complaint; |
| 145 | return complaint; |
| 146 | } |
| 147 | |
| 148 | |
| 149 | /* How many complaints about a particular thing should be printed |
| 150 | before we stop whining about it? Default is no whining at all, |
| 151 | since so many systems have ill-constructed symbol files. */ |
| 152 | |
| 153 | static int stop_whining = 0; |
| 154 | |
| 155 | /* Print a complaint, and link the complaint block into a chain for |
| 156 | later handling. */ |
| 157 | |
| 158 | static void ATTRIBUTE_PRINTF (4, 0) |
| 159 | vcomplaint (struct complaints **c, const char *file, |
| 160 | int line, const char *fmt, |
| 161 | va_list args) |
| 162 | { |
| 163 | struct complaints *complaints = get_complaints (c); |
| 164 | struct complain *complaint = find_complaint (complaints, file, |
| 165 | line, fmt); |
| 166 | enum complaint_series series; |
| 167 | |
| 168 | gdb_assert (complaints != NULL); |
| 169 | |
| 170 | complaint->counter++; |
| 171 | if (complaint->counter > stop_whining) |
| 172 | return; |
| 173 | |
| 174 | if (info_verbose) |
| 175 | series = SUBSEQUENT_MESSAGE; |
| 176 | else |
| 177 | series = complaints->series; |
| 178 | |
| 179 | /* Pass 'fmt' instead of 'complaint->fmt' to printf-like callees |
| 180 | from here on, to avoid "format string is not a string literal" |
| 181 | warnings. 'fmt' is this function's printf-format parameter, so |
| 182 | the compiler can assume the passed in argument is a literal |
| 183 | string somewhere up the call chain. */ |
| 184 | gdb_assert (complaint->fmt == fmt); |
| 185 | |
| 186 | if (complaint->file != NULL) |
| 187 | internal_vwarning (complaint->file, complaint->line, fmt, args); |
| 188 | else if (deprecated_warning_hook) |
| 189 | (*deprecated_warning_hook) (fmt, args); |
| 190 | else |
| 191 | { |
| 192 | if (complaints->explanation == NULL) |
| 193 | /* A [v]warning() call always appends a newline. */ |
| 194 | vwarning (fmt, args); |
| 195 | else |
| 196 | { |
| 197 | char *msg; |
| 198 | struct cleanup *cleanups; |
| 199 | msg = xstrvprintf (fmt, args); |
| 200 | cleanups = make_cleanup (xfree, msg); |
| 201 | wrap_here (""); |
| 202 | if (series != SUBSEQUENT_MESSAGE) |
| 203 | begin_line (); |
| 204 | /* XXX: i18n */ |
| 205 | fprintf_filtered (gdb_stderr, "%s%s%s", |
| 206 | complaints->explanation[series].prefix, msg, |
| 207 | complaints->explanation[series].postfix); |
| 208 | /* Force a line-break after any isolated message. For the |
| 209 | other cases, clear_complaints() takes care of any missing |
| 210 | trailing newline, the wrap_here() is just a hint. */ |
| 211 | if (series == ISOLATED_MESSAGE) |
| 212 | /* It would be really nice to use begin_line() here. |
| 213 | Unfortunately that function doesn't track GDB_STDERR and |
| 214 | consequently will sometimes supress a line when it |
| 215 | shouldn't. */ |
| 216 | fputs_filtered ("\n", gdb_stderr); |
| 217 | else |
| 218 | wrap_here (""); |
| 219 | do_cleanups (cleanups); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | switch (series) |
| 224 | { |
| 225 | case ISOLATED_MESSAGE: |
| 226 | break; |
| 227 | case FIRST_MESSAGE: |
| 228 | complaints->series = SUBSEQUENT_MESSAGE; |
| 229 | break; |
| 230 | case SUBSEQUENT_MESSAGE: |
| 231 | case SHORT_FIRST_MESSAGE: |
| 232 | complaints->series = SUBSEQUENT_MESSAGE; |
| 233 | break; |
| 234 | } |
| 235 | |
| 236 | /* If GDB dumps core, we'd like to see the complaints first. |
| 237 | Presumably GDB will not be sending so many complaints that this |
| 238 | becomes a performance hog. */ |
| 239 | |
| 240 | gdb_flush (gdb_stderr); |
| 241 | } |
| 242 | |
| 243 | void |
| 244 | complaint (struct complaints **complaints, const char *fmt, ...) |
| 245 | { |
| 246 | va_list args; |
| 247 | |
| 248 | va_start (args, fmt); |
| 249 | vcomplaint (complaints, NULL/*file*/, 0/*line*/, fmt, args); |
| 250 | va_end (args); |
| 251 | } |
| 252 | |
| 253 | void |
| 254 | internal_complaint (struct complaints **complaints, const char *file, |
| 255 | int line, const char *fmt, ...) |
| 256 | { |
| 257 | va_list args; |
| 258 | va_start (args, fmt); |
| 259 | vcomplaint (complaints, file, line, fmt, args); |
| 260 | va_end (args); |
| 261 | } |
| 262 | |
| 263 | /* Clear out / initialize all complaint counters that have ever been |
| 264 | incremented. If LESS_VERBOSE is 1, be less verbose about |
| 265 | successive complaints, since the messages are appearing all |
| 266 | together during a command that is reporting a contiguous block of |
| 267 | complaints (rather than being interleaved with other messages). If |
| 268 | noisy is 1, we are in a noisy command, and our caller will print |
| 269 | enough context for the user to figure it out. */ |
| 270 | |
| 271 | void |
| 272 | clear_complaints (struct complaints **c, int less_verbose, int noisy) |
| 273 | { |
| 274 | struct complaints *complaints = get_complaints (c); |
| 275 | struct complain *p; |
| 276 | |
| 277 | for (p = complaints->root; p != NULL; p = p->next) |
| 278 | { |
| 279 | p->counter = 0; |
| 280 | } |
| 281 | |
| 282 | switch (complaints->series) |
| 283 | { |
| 284 | case FIRST_MESSAGE: |
| 285 | /* Haven't yet printed anything. */ |
| 286 | break; |
| 287 | case SHORT_FIRST_MESSAGE: |
| 288 | /* Haven't yet printed anything. */ |
| 289 | break; |
| 290 | case ISOLATED_MESSAGE: |
| 291 | /* The code above, always forces a line-break. No need to do it |
| 292 | here. */ |
| 293 | break; |
| 294 | case SUBSEQUENT_MESSAGE: |
| 295 | /* It would be really nice to use begin_line() here. |
| 296 | Unfortunately that function doesn't track GDB_STDERR and |
| 297 | consequently will sometimes supress a line when it |
| 298 | shouldn't. */ |
| 299 | fputs_unfiltered ("\n", gdb_stderr); |
| 300 | break; |
| 301 | default: |
| 302 | internal_error (__FILE__, __LINE__, _("bad switch")); |
| 303 | } |
| 304 | |
| 305 | if (!less_verbose) |
| 306 | complaints->series = ISOLATED_MESSAGE; |
| 307 | else if (!noisy) |
| 308 | complaints->series = FIRST_MESSAGE; |
| 309 | else |
| 310 | complaints->series = SHORT_FIRST_MESSAGE; |
| 311 | } |
| 312 | |
| 313 | static void |
| 314 | complaints_show_value (struct ui_file *file, int from_tty, |
| 315 | struct cmd_list_element *cmd, const char *value) |
| 316 | { |
| 317 | fprintf_filtered (file, _("Max number of complaints about incorrect" |
| 318 | " symbols is %s.\n"), |
| 319 | value); |
| 320 | } |
| 321 | |
| 322 | void |
| 323 | _initialize_complaints (void) |
| 324 | { |
| 325 | add_setshow_zinteger_cmd ("complaints", class_support, |
| 326 | &stop_whining, _("\ |
| 327 | Set max number of complaints about incorrect symbols."), _("\ |
| 328 | Show max number of complaints about incorrect symbols."), NULL, |
| 329 | NULL, complaints_show_value, |
| 330 | &setlist, &showlist); |
| 331 | } |