gcc/cpperror.c

   1 /* Default error handlers for CPP Library.
   2    Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1998, 1999, 2000,
   3    2001, 2002  Free Software Foundation, Inc.
   4    Written by Per Bothner, 1994.
   5    Based on CCCP program by Paul Rubin, June 1986
   6    Adapted to ANSI C, Richard Stallman, Jan 1987
   7
   8 This program is free software; you can redistribute it and/or modify it
   9 under the terms of the GNU General Public License as published by the
  10 Free Software Foundation; either version 2, or (at your option) any
  11 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21
  22  In other words, you are welcome to use, share and improve this program.
  23  You are forbidden to forbid anyone else to use, share and improve
  24  what you give them.   Help stamp out software-hoarding!  */
  25
  26 #include "config.h"
  27 #include "system.h"
  28 #include "coretypes.h"
  29 #include "tm.h"
  30 #include "cpplib.h"
  31 #include "cpphash.h"
  32 #include "intl.h"
  33
  34 static void print_location PARAMS ((cpp_reader *, unsigned int, unsigned int));
  35
  36 /* Print the logical file location (LINE, COL) in preparation for a
  37    diagnostic.  Outputs the #include chain if it has changed.  A line
  38    of zero suppresses the include stack, and outputs the program name
  39    instead.  */
  40 static void
  41 print_location (pfile, line, col)
  42      cpp_reader *pfile;
  43      unsigned int line, col;
  44 {
  45   if (!pfile->buffer || line == 0)
  46     fprintf (stderr, "%s: ", progname);
  47   else
  48     {
  49       const struct line_map *map;
  50
  51       map = lookup_line (&pfile->line_maps, line);
  52       print_containing_files (&pfile->line_maps, map);
  53
  54       line = SOURCE_LINE (map, line);
  55       if (col == 0)
  56         col = 1;
  57
  58       if (line == 0)
  59         fprintf (stderr, "%s:", map->to_file);
  60       else if (CPP_OPTION (pfile, show_column) == 0)
  61         fprintf (stderr, "%s:%u:", map->to_file, line);
  62       else
  63         fprintf (stderr, "%s:%u:%u:", map->to_file, line, col);
  64
  65       fputc (' ', stderr);
  66     }
  67 }
  68
  69 /* Set up for a diagnostic: print the file and line, bump the error
  70    counter, etc.  LINE is the logical line number; zero means to print
  71    at the location of the previously lexed token, which tends to be
  72    the correct place by default.  Returns 0 if the error has been
  73    suppressed.  */
  74 int
  75 _cpp_begin_message (pfile, code, line, column)
  76      cpp_reader *pfile;
  77      int code;
  78      unsigned int line, column;
  79 {
  80   int level = DL_EXTRACT (code);
  81
  82   switch (level)
  83     {
  84     case DL_WARNING:
  85     case DL_PEDWARN:
  86       if (CPP_IN_SYSTEM_HEADER (pfile)
  87           && ! CPP_OPTION (pfile, warn_system_headers))
  88         return 0;
  89       /* Fall through.  */
  90
  91     case DL_WARNING_SYSHDR:
  92       if (CPP_OPTION (pfile, warnings_are_errors)
  93           || (level == DL_PEDWARN && CPP_OPTION (pfile, pedantic_errors)))
  94         {
  95           if (CPP_OPTION (pfile, inhibit_errors))
  96             return 0;
  97           level = DL_ERROR;
  98           pfile->errors++;
  99         }
 100       else if (CPP_OPTION (pfile, inhibit_warnings))
 101         return 0;
 102       break;
 103
 104     case DL_ERROR:
 105       if (CPP_OPTION (pfile, inhibit_errors))
 106         return 0;
 107       /* ICEs cannot be inhibited.  */
 108     case DL_ICE:
 109       pfile->errors++;
 110       break;
 111     }
 112
 113   print_location (pfile, line, column);
 114   if (DL_WARNING_P (level))
 115     fputs (_("warning: "), stderr);
 116   else if (level == DL_ICE)
 117     fputs (_("internal error: "), stderr);
 118
 119   return 1;
 120 }
 121
 122 /* Don't remove the blank before do, as otherwise the exgettext
 123    script will mistake this as a function definition */
 124 #define v_message(msgid, ap) \
 125  do { vfprintf (stderr, _(msgid), ap); putc ('\n', stderr); } while (0)
 126
 127 /* Exported interface.  */
 128
 129 /* Print an error at the location of the previously lexed token.  */
 130 void
 131 cpp_error (cpp_reader * pfile, int level, const char *msgid, ...)
 132 {
 133   unsigned int line, column;
 134   va_list ap;
 135
 136   va_start (ap, msgid);
 137
 138   if (pfile->buffer)
 139     {
 140       if (CPP_OPTION (pfile, traditional))
 141         {
 142           if (pfile->state.in_directive)
 143             line = pfile->directive_line;
 144           else
 145             line = pfile->line;
 146           column = 0;
 147         }
 148       else
 149         {
 150           line = pfile->cur_token[-1].line;
 151           column = pfile->cur_token[-1].col;
 152         }
 153     }
 154   else
 155     line = column = 0;
 156
 157   if (_cpp_begin_message (pfile, level, line, column))
 158     v_message (msgid, ap);
 159
 160   va_end (ap);
 161 }
 162
 163 /* Print an error at a specific location.  */
 164 void
 165 cpp_error_with_line (cpp_reader *pfile, int level,
 166                      unsigned int line, unsigned int column,
 167                      const char *msgid, ...)
 168 {
 169   va_list ap;
 170
 171   va_start (ap, msgid);
 172
 173   if (_cpp_begin_message (pfile, level, line, column))
 174     v_message (msgid, ap);
 175
 176   va_end (ap);
 177 }
 178
 179 void
 180 cpp_errno (pfile, level, msgid)
 181      cpp_reader *pfile;
 182      int level;
 183      const char *msgid;
 184 {
 185   if (msgid[0] == '\0')
 186     msgid = _("stdout");
 187
 188   cpp_error (pfile, level, "%s: %s", msgid, xstrerror (errno));
 189 }