gdb/complaints.c

   1 /* Support for complaint handling during symbol reading in GDB.
   2
   3    Copyright (C) 1990-2018 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 /* Should each complaint message be self explanatory, or should we
  26    assume that a series of complaints is being produced?  */
  27
  28 enum complaint_series {
  29   /* Isolated self explanatory message.  */
  30   ISOLATED_MESSAGE,
  31
  32   /* First message of a series, but does not need to include any sort
  33      of explanation.  */
  34   SHORT_FIRST_MESSAGE,
  35 };
  36
  37 /* Structure to manage complaints about symbol file contents.  */
  38
  39 struct complain
  40 {
  41   const char *file;
  42   int line;
  43   const char *fmt;
  44   int counter;
  45   struct complain *next;
  46 };
  47
  48 /* The explanatory message that should accompany the complaint.  The
  49    message is in two parts - pre and post - that are printed around
  50    the complaint text.  */
  51 struct explanation
  52 {
  53   const char *prefix;
  54   const char *postfix;
  55 };
  56
  57 struct complaints
  58 {
  59   struct complain *root;
  60
  61   enum complaint_series series;
  62
  63   /* The explanatory messages that should accompany the complaint.
  64      NOTE: cagney/2002-08-14: In a desperate attempt at being vaguely
  65      i18n friendly, this is an array of two messages.  When present,
  66      the PRE and POST EXPLANATION[SERIES] are used to wrap the
  67      message.  */
  68   const struct explanation *explanation;
  69 };
  70
  71 static struct complain complaint_sentinel;
  72
  73 /* The symbol table complaint table.  */
  74
  75 static struct explanation symfile_explanations[] = {
  76   { "During symbol reading, ", "." },
  77   { "", "..."},
  78   { NULL, NULL }
  79 };
  80
  81 static struct complaints symfile_complaint_book = {
  82   &complaint_sentinel,
  83   ISOLATED_MESSAGE,
  84   symfile_explanations
  85 };
  86 struct complaints *symfile_complaints = &symfile_complaint_book;
  87
  88 /* Wrapper function to, on-demand, fill in a complaints object.  */
  89
  90 static struct complaints *
  91 get_complaints (struct complaints **c)
  92 {
  93   if ((*c) != NULL)
  94     return (*c);
  95   (*c) = XNEW (struct complaints);
  96   (*c)->root = &complaint_sentinel;
  97   (*c)->series = ISOLATED_MESSAGE;
  98   (*c)->explanation = NULL;
  99   return (*c);
 100 }
 101
 102 static struct complain * ATTRIBUTE_PRINTF (4, 0)
 103 find_complaint (struct complaints *complaints, const char *file,
 104                 int line, const char *fmt)
 105 {
 106   struct complain *complaint;
 107
 108   /* Find the complaint in the table.  A more efficient search
 109      algorithm (based on hash table or something) could be used.  But
 110      that can wait until someone shows evidence that this lookup is
 111      a real bottle neck.  */
 112   for (complaint = complaints->root;
 113        complaint != NULL;
 114        complaint = complaint->next)
 115     {
 116       if (complaint->fmt == fmt
 117           && complaint->file == file
 118           && complaint->line == line)
 119         return complaint;
 120     }
 121
 122   /* Oops not seen before, fill in a new complaint.  */
 123   complaint = XNEW (struct complain);
 124   complaint->fmt = fmt;
 125   complaint->file = file;
 126   complaint->line = line;
 127   complaint->counter = 0;
 128   complaint->next = NULL;
 129
 130   /* File it, return it.  */
 131   complaint->next = complaints->root;
 132   complaints->root = complaint;
 133   return complaint;
 134 }
 135
 136
 137 /* How many complaints about a particular thing should be printed
 138    before we stop whining about it?  Default is no whining at all,
 139    since so many systems have ill-constructed symbol files.  */
 140
 141 int stop_whining = 0;
 142
 143 /* Print a complaint, and link the complaint block into a chain for
 144    later handling.  */
 145
 146 static void ATTRIBUTE_PRINTF (4, 0)
 147 vcomplaint (struct complaints **c, const char *file,
 148             int line, const char *fmt,
 149             va_list args)
 150 {
 151   struct complaints *complaints = get_complaints (c);
 152   struct complain *complaint = find_complaint (complaints, file,
 153                                                line, fmt);
 154   enum complaint_series series;
 155
 156   gdb_assert (complaints != NULL);
 157
 158   complaint->counter++;
 159   if (complaint->counter > stop_whining)
 160     return;
 161
 162   series = complaints->series;
 163
 164   /* Pass 'fmt' instead of 'complaint->fmt' to printf-like callees
 165      from here on, to avoid "format string is not a string literal"
 166      warnings.  'fmt' is this function's printf-format parameter, so
 167      the compiler can assume the passed in argument is a literal
 168      string somewhere up the call chain.  */
 169   gdb_assert (complaint->fmt == fmt);
 170
 171   if (complaint->file != NULL)
 172     internal_vwarning (complaint->file, complaint->line, fmt, args);
 173   else if (deprecated_warning_hook)
 174     (*deprecated_warning_hook) (fmt, args);
 175   else
 176     {
 177       if (complaints->explanation == NULL)
 178         /* A [v]warning() call always appends a newline.  */
 179         vwarning (fmt, args);
 180       else
 181         {
 182           std::string msg = string_vprintf (fmt, args);
 183           wrap_here ("");
 184           begin_line ();
 185           /* XXX: i18n */
 186           fprintf_filtered (gdb_stderr, "%s%s%s",
 187                             complaints->explanation[series].prefix,
 188                             msg.c_str (),
 189                             complaints->explanation[series].postfix);
 190           /* Force a line-break after any isolated message.  */
 191           if (series == ISOLATED_MESSAGE)
 192             /* It would be really nice to use begin_line() here.
 193                Unfortunately that function doesn't track GDB_STDERR and
 194                consequently will sometimes supress a line when it
 195                shouldn't.  */
 196             fputs_filtered ("\n", gdb_stderr);
 197           else
 198             wrap_here ("");
 199         }
 200     }
 201
 202   /* If GDB dumps core, we'd like to see the complaints first.
 203      Presumably GDB will not be sending so many complaints that this
 204      becomes a performance hog.  */
 205
 206   gdb_flush (gdb_stderr);
 207 }
 208
 209 void
 210 complaint_internal (struct complaints **complaints, const char *fmt, ...)
 211 {
 212   va_list args;
 213
 214   va_start (args, fmt);
 215   vcomplaint (complaints, NULL/*file*/, 0/*line*/, fmt, args);
 216   va_end (args);
 217 }
 218
 219 /* Clear out / initialize all complaint counters that have ever been
 220    incremented.  If LESS_VERBOSE is 1, be less verbose about
 221    successive complaints, since the messages are appearing all
 222    together during a command that is reporting a contiguous block of
 223    complaints (rather than being interleaved with other messages).  */
 224
 225 void
 226 clear_complaints (struct complaints **c, int less_verbose)
 227 {
 228   struct complaints *complaints = get_complaints (c);
 229   struct complain *p;
 230
 231   for (p = complaints->root; p != NULL; p = p->next)
 232     {
 233       p->counter = 0;
 234     }
 235
 236   if (!less_verbose)
 237     complaints->series = ISOLATED_MESSAGE;
 238   else
 239     complaints->series = SHORT_FIRST_MESSAGE;
 240 }
 241
 242 static void
 243 complaints_show_value (struct ui_file *file, int from_tty,
 244                        struct cmd_list_element *cmd, const char *value)
 245 {
 246   fprintf_filtered (file, _("Max number of complaints about incorrect"
 247                             " symbols is %s.\n"),
 248                     value);
 249 }
 250
 251 void
 252 _initialize_complaints (void)
 253 {
 254   add_setshow_zinteger_cmd ("complaints", class_support,
 255                             &stop_whining, _("\
 256 Set max number of complaints about incorrect symbols."), _("\
 257 Show max number of complaints about incorrect symbols."), NULL,
 258                             NULL, complaints_show_value,
 259                             &setlist, &showlist);
 260 }