gdb/complaints.c

   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 *
 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 ATTR_FORMAT (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   gdb_assert (complaints != NULL);
 175
 176   complaint->counter++;
 177   if (complaint->counter > stop_whining)
 178     return;
 179
 180   if (info_verbose)
 181     series = SUBSEQUENT_MESSAGE;
 182   else
 183     series = complaints->series;
 184
 185   if (complaint->file != NULL)
 186     internal_vwarning (complaint->file, complaint->line, complaint->fmt, args);
 187   else if (deprecated_warning_hook)
 188     (*deprecated_warning_hook) (complaint->fmt, args);
 189   else
 190     {
 191       if (complaints->explanation == NULL)
 192         /* A [v]warning() call always appends a newline.  */
 193         vwarning (complaint->fmt, args);
 194       else
 195         {
 196           char *msg;
 197           struct cleanup *cleanups;
 198           msg = xstrvprintf (complaint->fmt, args);
 199           cleanups = make_cleanup (xfree, msg);
 200           wrap_here ("");
 201           if (series != SUBSEQUENT_MESSAGE)
 202             begin_line ();
 203           /* XXX: i18n */
 204           fprintf_filtered (gdb_stderr, "%s%s%s",
 205                             complaints->explanation[series].prefix, msg,
 206                             complaints->explanation[series].postfix);
 207           /* Force a line-break after any isolated message.  For the
 208              other cases, clear_complaints() takes care of any missing
 209              trailing newline, the wrap_here() is just a hint.  */
 210           if (series == ISOLATED_MESSAGE)
 211             /* It would be really nice to use begin_line() here.
 212                Unfortunately that function doesn't track GDB_STDERR and
 213                consequently will sometimes supress a line when it
 214                shouldn't.  */
 215             fputs_filtered ("\n", gdb_stderr);
 216           else
 217             wrap_here ("");
 218           do_cleanups (cleanups);
 219         }
 220     }
 221
 222   switch (series)
 223     {
 224     case ISOLATED_MESSAGE:
 225       break;
 226     case FIRST_MESSAGE:
 227       complaints->series = SUBSEQUENT_MESSAGE;
 228       break;
 229     case SUBSEQUENT_MESSAGE:
 230     case SHORT_FIRST_MESSAGE:
 231       complaints->series = SUBSEQUENT_MESSAGE;
 232       break;
 233     }
 234
 235   /* If GDB dumps core, we'd like to see the complaints first.
 236      Presumably GDB will not be sending so many complaints that this
 237      becomes a performance hog.  */
 238
 239   gdb_flush (gdb_stderr);
 240 }
 241
 242 void
 243 complaint (struct complaints **complaints, const char *fmt, ...)
 244 {
 245   va_list args;
 246   va_start (args, fmt);
 247   vcomplaint (complaints, NULL/*file*/, 0/*line*/, fmt, args);
 248   va_end (args);
 249 }
 250
 251 void
 252 internal_complaint (struct complaints **complaints, const char *file,
 253                     int line, const char *fmt, ...)
 254 {
 255   va_list args;
 256   va_start (args, fmt);
 257   vcomplaint (complaints, file, line, fmt, args);
 258   va_end (args);
 259 }
 260
 261 /* Clear out / initialize all complaint counters that have ever been
 262    incremented.  If LESS_VERBOSE is 1, be less verbose about
 263    successive complaints, since the messages are appearing all
 264    together during a command that is reporting a contiguous block of
 265    complaints (rather than being interleaved with other messages).  If
 266    noisy is 1, we are in a noisy command, and our caller will print
 267    enough context for the user to figure it out.  */
 268
 269 void
 270 clear_complaints (struct complaints **c, int less_verbose, int noisy)
 271 {
 272   struct complaints *complaints = get_complaints (c);
 273   struct complain *p;
 274
 275   for (p = complaints->root; p != NULL; p = p->next)
 276     {
 277       p->counter = 0;
 278     }
 279
 280   switch (complaints->series)
 281     {
 282     case FIRST_MESSAGE:
 283       /* Haven't yet printed anything.  */
 284       break;
 285     case SHORT_FIRST_MESSAGE:
 286       /* Haven't yet printed anything.  */
 287       break;
 288     case ISOLATED_MESSAGE:
 289       /* The code above, always forces a line-break.  No need to do it
 290          here.  */
 291       break;
 292     case SUBSEQUENT_MESSAGE:
 293       /* It would be really nice to use begin_line() here.
 294          Unfortunately that function doesn't track GDB_STDERR and
 295          consequently will sometimes supress a line when it shouldn't.  */
 296       fputs_unfiltered ("\n", gdb_stderr);
 297       break;
 298     default:
 299       internal_error (__FILE__, __LINE__, _("bad switch"));
 300     }
 301
 302   if (!less_verbose)
 303     complaints->series = ISOLATED_MESSAGE;
 304   else if (!noisy)
 305     complaints->series = FIRST_MESSAGE;
 306   else
 307     complaints->series = SHORT_FIRST_MESSAGE;
 308 }
 309
 310 static void
 311 complaints_show_value (struct ui_file *file, int from_tty,
 312                        struct cmd_list_element *cmd, const char *value)
 313 {
 314   fprintf_filtered (file, _("Max number of complaints about incorrect"
 315                             " symbols is %s.\n"),
 316                     value);
 317 }
 318
 319 void
 320 _initialize_complaints (void)
 321 {
 322   add_setshow_zinteger_cmd ("complaints", class_support, &stop_whining, _("\
 323 Set max number of complaints about incorrect symbols."), _("\
 324 Show max number of complaints about incorrect symbols."), NULL,
 325                             NULL, complaints_show_value,
 326                             &setlist, &showlist);
 327 }