1 /* Support for complaint handling during symbol reading in GDB. 2 3 Copyright (C) 1990, 1991, 1992, 1993, 1995, 1998, 1999, 2000, 2002, 2004, 4 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "complaints.h" 23 #include "gdb_assert.h" 24 #include "command.h" 25 #include "gdbcmd.h" 26 27 extern void _initialize_complaints (void); 28 29 /* Should each complaint message be self explanatory, or should we assume that 30 a series of complaints is being produced? */ 31 32 /* case 1: First message of a series that must 33 start off with explanation. case 2: Subsequent message of a series 34 that needs no explanation (the user already knows we have a problem 35 so we can just state our piece). */ 36 enum complaint_series { 37 /* Isolated self explanatory message. */ 38 ISOLATED_MESSAGE, 39 /* First message of a series, includes an explanation. */ 40 FIRST_MESSAGE, 41 /* First message of a series, but does not need to include any sort 42 of explanation. */ 43 SHORT_FIRST_MESSAGE, 44 /* Subsequent message of a series that needs no explanation (the 45 user already knows we have a problem so we can just state our 46 piece). */ 47 SUBSEQUENT_MESSAGE 48 }; 49 50 /* Structure to manage complaints about symbol file contents. */ 51 52 struct complain 53 { 54 const char *file; 55 int line; 56 const char *fmt; 57 int counter; 58 struct complain *next; 59 }; 60 61 /* The explanatory message that should accompany the complaint. The 62 message is in two parts - pre and post - that are printed around 63 the complaint text. */ 64 struct explanation 65 { 66 const char *prefix; 67 const char *postfix; 68 }; 69 70 struct complaints 71 { 72 struct complain *root; 73 74 /* Should each complaint be self explanatory, or should we assume 75 that a series of complaints is being produced? case 0: Isolated 76 self explanatory message. case 1: First message of a series that 77 must start off with explanation. case 2: Subsequent message of a 78 series that needs no explanation (the user already knows we have 79 a problem so we can just state our piece). */ 80 int series; 81 82 /* The explanatory messages that should accompany the complaint. 83 NOTE: cagney/2002-08-14: In a desperate attempt at being vaguely 84 i18n friendly, this is an array of two messages. When present, 85 the PRE and POST EXPLANATION[SERIES] are used to wrap the 86 message. */ 87 const struct explanation *explanation; 88 }; 89 90 static struct complain complaint_sentinel; 91 92 /* The symbol table complaint table. */ 93 94 static struct explanation symfile_explanations[] = { 95 { "During symbol reading, ", "." }, 96 { "During symbol reading...", "..."}, 97 { "", "..."}, 98 { "", "..."}, 99 { NULL, NULL } 100 }; 101 102 static struct complaints symfile_complaint_book = { 103 &complaint_sentinel, 104 0, 105 symfile_explanations 106 }; 107 struct complaints *symfile_complaints = &symfile_complaint_book; 108 109 /* Wrapper function to, on-demand, fill in a complaints object. */ 110 111 static struct complaints * 112 get_complaints (struct complaints **c) 113 { 114 if ((*c) != NULL) 115 return (*c); 116 (*c) = XMALLOC (struct complaints); 117 (*c)->root = &complaint_sentinel; 118 (*c)->series = ISOLATED_MESSAGE; 119 (*c)->explanation = NULL; 120 return (*c); 121 } 122 123 static struct complain * ATTRIBUTE_PRINTF (4, 0) 124 find_complaint (struct complaints *complaints, const char *file, 125 int line, const char *fmt) 126 { 127 struct complain *complaint; 128 129 /* Find the complaint in the table. A more efficient search 130 algorithm (based on hash table or something) could be used. But 131 that can wait until someone shows evidence that this lookup is 132 a real bottle neck. */ 133 for (complaint = complaints->root; 134 complaint != NULL; 135 complaint = complaint->next) 136 { 137 if (complaint->fmt == fmt 138 && complaint->file == file 139 && complaint->line == line) 140 return complaint; 141 } 142 143 /* Oops not seen before, fill in a new complaint. */ 144 complaint = XMALLOC (struct complain); 145 complaint->fmt = fmt; 146 complaint->file = file; 147 complaint->line = line; 148 complaint->counter = 0; 149 complaint->next = NULL; 150 151 /* File it, return it. */ 152 complaint->next = complaints->root; 153 complaints->root = complaint; 154 return complaint; 155 } 156 157 158 /* How many complaints about a particular thing should be printed 159 before we stop whining about it? Default is no whining at all, 160 since so many systems have ill-constructed symbol files. */ 161 162 static int stop_whining = 0; 163 164 /* Print a complaint, and link the complaint block into a chain for 165 later handling. */ 166 167 static void ATTRIBUTE_PRINTF (4, 0) 168 vcomplaint (struct complaints **c, const char *file, int line, const char *fmt, 169 va_list args) 170 { 171 struct complaints *complaints = get_complaints (c); 172 struct complain *complaint = find_complaint (complaints, file, line, fmt); 173 enum complaint_series series; 174 175 gdb_assert (complaints != NULL); 176 177 complaint->counter++; 178 if (complaint->counter > stop_whining) 179 return; 180 181 if (info_verbose) 182 series = SUBSEQUENT_MESSAGE; 183 else 184 series = complaints->series; 185 186 if (complaint->file != NULL) 187 internal_vwarning (complaint->file, complaint->line, complaint->fmt, args); 188 else if (deprecated_warning_hook) 189 (*deprecated_warning_hook) (complaint->fmt, args); 190 else 191 { 192 if (complaints->explanation == NULL) 193 /* A [v]warning() call always appends a newline. */ 194 vwarning (complaint->fmt, args); 195 else 196 { 197 char *msg; 198 struct cleanup *cleanups; 199 msg = xstrvprintf (complaint->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 shouldn't. */ 298 fputs_unfiltered ("\n", gdb_stderr); 299 break; 300 default: 301 internal_error (__FILE__, __LINE__, _("bad switch")); 302 } 303 304 if (!less_verbose) 305 complaints->series = ISOLATED_MESSAGE; 306 else if (!noisy) 307 complaints->series = FIRST_MESSAGE; 308 else 309 complaints->series = SHORT_FIRST_MESSAGE; 310 } 311 312 static void 313 complaints_show_value (struct ui_file *file, int from_tty, 314 struct cmd_list_element *cmd, const char *value) 315 { 316 fprintf_filtered (file, _("Max number of complaints about incorrect" 317 " symbols is %s.\n"), 318 value); 319 } 320 321 void 322 _initialize_complaints (void) 323 { 324 add_setshow_zinteger_cmd ("complaints", class_support, &stop_whining, _("\ 325 Set max number of complaints about incorrect symbols."), _("\ 326 Show max number of complaints about incorrect symbols."), NULL, 327 NULL, complaints_show_value, 328 &setlist, &showlist); 329 } 330