gdb/complaints.c

   1 /* Support for complaint handling during symbol reading in GDB.
   2
   3    Copyright 1990, 1991, 1992, 1993, 1995, 1998, 1999, 2000, 2002 Free
   4    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 2 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, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "complaints.h"
  25 #include "gdb_assert.h"
  26 #include "command.h"
  27 #include "gdbcmd.h"
  28
  29 extern void _initialize_complaints (void);
  30
  31 /* Should each complaint message be self explanatory, or should we assume that
  32    a series of complaints is being produced?  */
  33
  34 /* case 1: First message of a series that must
  35    start off with explanation.  case 2: Subsequent message of a series
  36    that needs no explanation (the user already knows we have a problem
  37    so we can just state our piece).  */
  38 enum complaint_series {
  39   /* Isolated self explanatory message.  */
  40   ISOLATED_MESSAGE,
  41   /* First message of a series, includes an explanation.  */
  42   FIRST_MESSAGE,
  43   /* First message of a series, but does not need to include any sort
  44      of explanation.  */
  45   SHORT_FIRST_MESSAGE,
  46   /* Subsequent message of a series that needs no explanation (the
  47      user already knows we have a problem so we can just state our
  48      piece).  */
  49   SUBSEQUENT_MESSAGE
  50 };
  51
  52 /* Structure to manage complaints about symbol file contents.  */
  53
  54 struct complain
  55 {
  56   const char *file;
  57   int line;
  58   const char *fmt;
  59   int counter;
  60   struct complain *next;
  61 };
  62
  63 struct complaints
  64 {
  65   struct complain *root;
  66
  67   /* Should each complaint be self explanatory, or should we assume
  68      that a series of complaints is being produced?  case 0: Isolated
  69      self explanatory message.  case 1: First message of a series that
  70      must start off with explanation.  case 2: Subsequent message of a
  71      series that needs no explanation (the user already knows we have
  72      a problem so we can just state our piece).  */
  73   int series;
  74
  75   /* The explanatory messages that should accompany the complaint.
  76      NOTE: cagney/2002-08-14: In a desperate attempt at being vaguely
  77      i18n friendly, this is an array of two messages.  When present,
  78      EXPLANATION[SERIES] is used to wrap the message.  */
  79   const char **explanation;
  80 };
  81
  82 static struct complain complaint_sentinel;
  83
  84 /* The symbol table complaint table.  */
  85
  86 static const char *symfile_explanations[] = {
  87   "During symbol reading, %s.",
  88   "During symbol reading...%s...",
  89   "%s...",
  90   "%s...",
  91   NULL
  92 };
  93
  94 static struct complaints symfile_complaint_book = {
  95   &complaint_sentinel,
  96   0,
  97   symfile_explanations
  98 };
  99 struct complaints *symfile_complaints = &symfile_complaint_book;
 100
 101 /* Wrapper function to, on-demand, fill in a complaints object.  */
 102
 103 static struct complaints *
 104 get_complaints (struct complaints **c)
 105 {
 106   if ((*c) != NULL)
 107     return (*c);
 108   (*c) = XMALLOC (struct complaints);
 109   (*c)->root = &complaint_sentinel;
 110   (*c)->series = ISOLATED_MESSAGE;
 111   (*c)->explanation = NULL;
 112   return (*c);
 113 }
 114
 115 static struct complain *
 116 find_complaint (struct complaints *complaints, const char *file,
 117                 int line, const char *fmt)
 118 {
 119   struct complain *complaint;
 120
 121   /* Find the complaint in the table.  A more efficient search
 122      algorithm (based on hash table or something) could be used.  But
 123      that can wait until someone shows evidence that this lookup is
 124      a real bottle neck.  */
 125   for (complaint = complaints->root;
 126        complaint != NULL;
 127        complaint = complaint->next)
 128     {
 129       if (complaint->fmt == fmt
 130           && complaint->file == file
 131           && complaint->line == line)
 132         return complaint;
 133     }
 134
 135   /* Oops not seen before, fill in a new complaint.  */
 136   complaint = XMALLOC (struct complain);
 137   complaint->fmt = fmt;
 138   complaint->file = file;
 139   complaint->line = line;
 140   complaint->counter = 0;
 141   complaint->next = NULL;
 142
 143   /* File it, return it.  */
 144   complaint->next = complaints->root;
 145   complaints->root = complaint;
 146   return complaint;
 147 }
 148
 149
 150 /* How many complaints about a particular thing should be printed
 151    before we stop whining about it?  Default is no whining at all,
 152    since so many systems have ill-constructed symbol files.  */
 153
 154 static unsigned int stop_whining = 0;
 155
 156 /* Print a complaint, and link the complaint block into a chain for
 157    later handling.  */
 158
 159 static void
 160 vcomplaint (struct complaints **c, const char *file, 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, line, fmt);
 165   enum complaint_series series;
 166   gdb_assert (complaints != NULL);
 167
 168   complaint->counter++;
 169   if (complaint->counter > stop_whining)
 170     return;
 171
 172   if (info_verbose)
 173     series = SUBSEQUENT_MESSAGE;
 174   else
 175     series = complaints->series;
 176
 177   if (complaint->file != NULL)
 178     internal_vwarning (complaint->file, complaint->line, complaint->fmt, args);
 179   else if (warning_hook)
 180     (*warning_hook) (complaint->fmt, args);
 181   else
 182     {
 183       if (complaints->explanation == NULL)
 184         /* A [v]warning() call always appends a newline.  */
 185         vwarning (complaint->fmt, args);
 186       else
 187         {
 188           char *msg;
 189           struct cleanup *cleanups;
 190           xvasprintf (&msg, complaint->fmt, args);
 191           cleanups = make_cleanup (xfree, msg);
 192           wrap_here ("");
 193           if (series != SUBSEQUENT_MESSAGE)
 194             begin_line ();
 195           fprintf_filtered (gdb_stderr,
 196                             complaints->explanation[series],
 197                             msg);
 198           /* Force a line-break after any isolated message.  For the
 199              other cases, clear_complaints() takes care of any missing
 200              trailing newline, the wrap_here() is just a hint.  */
 201           if (series == ISOLATED_MESSAGE)
 202             /* It would be really nice to use begin_line() here.
 203                Unfortunatly that function doesn't track GDB_STDERR and
 204                consequently will sometimes supress a line when it
 205                shouldn't.  */
 206             fputs_filtered ("\n", gdb_stderr);
 207           else
 208             wrap_here ("");
 209           do_cleanups (cleanups);
 210         }
 211     }
 212
 213   switch (series)
 214     {
 215     case ISOLATED_MESSAGE:
 216       break;
 217     case FIRST_MESSAGE:
 218       complaints->series = SUBSEQUENT_MESSAGE;
 219       break;
 220     case SUBSEQUENT_MESSAGE:
 221     case SHORT_FIRST_MESSAGE:
 222       complaints->series = SUBSEQUENT_MESSAGE;
 223       break;
 224     }
 225
 226   /* If GDB dumps core, we'd like to see the complaints first.
 227      Presumably GDB will not be sending so many complaints that this
 228      becomes a performance hog.  */
 229
 230   gdb_flush (gdb_stderr);
 231 }
 232
 233 void
 234 complaint (struct complaints **complaints, const char *fmt, ...)
 235 {
 236   va_list args;
 237   va_start (args, fmt);
 238   vcomplaint (complaints, NULL/*file*/, 0/*line*/, fmt, args);
 239   va_end (args);
 240 }
 241
 242 void
 243 internal_complaint (struct complaints **complaints, const char *file,
 244                     int line, const char *fmt, ...)
 245 {
 246   va_list args;
 247   va_start (args, fmt);
 248   vcomplaint (complaints, file, line, fmt, args);
 249   va_end (args);
 250 }
 251
 252 /* Clear out / initialize all complaint counters that have ever been
 253    incremented.  If LESS_VERBOSE is 1, be less verbose about
 254    successive complaints, since the messages are appearing all
 255    together during a command that is reporting a contiguous block of
 256    complaints (rather than being interleaved with other messages).  If
 257    noisy is 1, we are in a noisy command, and our caller will print
 258    enough context for the user to figure it out.  */
 259
 260 void
 261 clear_complaints (struct complaints **c, int less_verbose, int noisy)
 262 {
 263   struct complaints *complaints = get_complaints (c);
 264   struct complain *p;
 265
 266   for (p = complaints->root; p != NULL; p = p->next)
 267     {
 268       p->counter = 0;
 269     }
 270
 271   switch (complaints->series)
 272     {
 273     case FIRST_MESSAGE:
 274       /* Haven't yet printed anything.  */
 275       break;
 276     case SHORT_FIRST_MESSAGE:
 277       /* Haven't yet printed anything.  */
 278       break;
 279     case ISOLATED_MESSAGE:
 280       /* The code above, always forces a line-break.  No need to do it
 281          here.  */
 282       break;
 283     case SUBSEQUENT_MESSAGE:
 284       /* It would be really nice to use begin_line() here.
 285          Unfortunatly that function doesn't track GDB_STDERR and
 286          consequently will sometimes supress a line when it shouldn't.  */
 287       fputs_unfiltered ("\n", gdb_stderr);
 288       break;
 289     default:
 290       internal_error (__FILE__, __LINE__, "bad switch");
 291     }
 292
 293   if (!less_verbose)
 294     complaints->series = ISOLATED_MESSAGE;
 295   else if (!noisy)
 296     complaints->series = FIRST_MESSAGE;
 297   else
 298     complaints->series = SHORT_FIRST_MESSAGE;
 299 }
 300
 301 void
 302 _initialize_complaints (void)
 303 {
 304   add_setshow_cmd ("complaints", class_support, var_zinteger,
 305                    &stop_whining,
 306                    "Set max number of complaints about incorrect symbols.",
 307                    "Show max number of complaints about incorrect symbols.",
 308                    NULL, NULL,
 309                    &setlist, &showlist);
 310
 311 }