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 "cpplib.h"
  29 #include "cpphash.h"
  30 #include "intl.h"
  31
  32 static void print_location PARAMS ((cpp_reader *, unsigned int, unsigned int));
  33
  34 /* Print the logical file location (LINE, COL) in preparation for a
  35    diagnostic.  Outputs the #include chain if it has changed.  A line
  36    of zero suppresses the include stack, and outputs the program name
  37    instead.  */
  38 static void
  39 print_location (pfile, line, col)
  40      cpp_reader *pfile;
  41      unsigned int line, col;
  42 {
  43   if (!pfile->buffer || line == 0)
  44     fprintf (stderr, "%s: ", progname);
  45   else
  46     {
  47       const struct line_map *map;
  48
  49       map = lookup_line (&pfile->line_maps, line);
  50       print_containing_files (&pfile->line_maps, map);
  51
  52       line = SOURCE_LINE (map, line);
  53       if (col == 0)
  54         col = 1;
  55
  56       if (line == 0)
  57         fprintf (stderr, "%s:", map->to_file);
  58       else if (CPP_OPTION (pfile, show_column) == 0)
  59         fprintf (stderr, "%s:%u:", map->to_file, line);
  60       else
  61         fprintf (stderr, "%s:%u:%u:", map->to_file, line, col);
  62
  63       fputc (' ', stderr);
  64     }
  65 }
  66
  67 /* Set up for a diagnostic: print the file and line, bump the error
  68    counter, etc.  LINE is the logical line number; zero means to print
  69    at the location of the previously lexed token, which tends to be
  70    the correct place by default.  Returns 0 if the error has been
  71    suppressed.  */
  72 int
  73 _cpp_begin_message (pfile, code, line, column)
  74      cpp_reader *pfile;
  75      int code;
  76      unsigned int line, column;
  77 {
  78   int level = DL_EXTRACT (code);
  79
  80   switch (level)
  81     {
  82     case DL_WARNING:
  83     case DL_PEDWARN:
  84       if (CPP_IN_SYSTEM_HEADER (pfile)
  85           && ! CPP_OPTION (pfile, warn_system_headers))
  86         return 0;
  87       /* Fall through.  */
  88
  89     case DL_WARNING_SYSHDR:
  90       if (CPP_OPTION (pfile, warnings_are_errors)
  91           || (level == DL_PEDWARN && CPP_OPTION (pfile, pedantic_errors)))
  92         {
  93           if (CPP_OPTION (pfile, inhibit_errors))
  94             return 0;
  95           level = DL_ERROR;
  96           pfile->errors++;
  97         }
  98       else if (CPP_OPTION (pfile, inhibit_warnings))
  99         return 0;
 100       break;
 101
 102     case DL_ERROR:
 103       if (CPP_OPTION (pfile, inhibit_errors))
 104         return 0;
 105       /* ICEs cannot be inhibited.  */
 106     case DL_ICE:
 107       pfile->errors++;
 108       break;
 109     }
 110
 111   print_location (pfile, line, column);
 112   if (DL_WARNING_P (level))
 113     fputs (_("warning: "), stderr);
 114   else if (level == DL_ICE)
 115     fputs (_("internal error: "), stderr);
 116
 117   return 1;
 118 }
 119
 120 /* Don't remove the blank before do, as otherwise the exgettext
 121    script will mistake this as a function definition */
 122 #define v_message(msgid, ap) \
 123  do { vfprintf (stderr, _(msgid), ap); putc ('\n', stderr); } while (0)
 124
 125 /* Exported interface.  */
 126
 127 /* Print an error at the location of the previously lexed token.  */
 128 void
 129 cpp_error VPARAMS ((cpp_reader * pfile, int level, const char *msgid, ...))
 130 {
 131   unsigned int line, column;
 132
 133   VA_OPEN (ap, msgid);
 134   VA_FIXEDARG (ap, cpp_reader *, pfile);
 135   VA_FIXEDARG (ap, int, level);
 136   VA_FIXEDARG (ap, const char *, 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_CLOSE (ap);
 161 }
 162
 163 /* Print an error at a specific location.  */
 164 void
 165 cpp_error_with_line VPARAMS ((cpp_reader *pfile, int level,
 166                               unsigned int line, unsigned int column,
 167                               const char *msgid, ...))
 168 {
 169   VA_OPEN (ap, msgid);
 170   VA_FIXEDARG (ap, cpp_reader *, pfile);
 171   VA_FIXEDARG (ap, int, level);
 172   VA_FIXEDARG (ap, unsigned int, line);
 173   VA_FIXEDARG (ap, unsigned int, column);
 174   VA_FIXEDARG (ap, const char *, msgid);
 175
 176   if (_cpp_begin_message (pfile, level, line, column))
 177     v_message (msgid, ap);
 178
 179   VA_CLOSE (ap);
 180 }
 181
 182 void
 183 cpp_errno (pfile, level, msgid)
 184      cpp_reader *pfile;
 185      int level;
 186      const char *msgid;
 187 {
 188   if (msgid[0] == '\0')
 189     msgid = _("stdout");
 190
 191   cpp_error (pfile, level, "%s: %s", msgid, xstrerror (errno));
 192 }