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 (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 (cpp_reader *pfile, unsigned int line, unsigned int 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 (cpp_reader *pfile, int code, unsigned int line,
  74                     unsigned int column)
  75 {
  76   int level = DL_EXTRACT (code);
  77
  78   switch (level)
  79     {
  80     case DL_WARNING:
  81     case DL_PEDWARN:
  82       if (CPP_IN_SYSTEM_HEADER (pfile)
  83           && ! CPP_OPTION (pfile, warn_system_headers))
  84         return 0;
  85       /* Fall through.  */
  86
  87     case DL_WARNING_SYSHDR:
  88       if (CPP_OPTION (pfile, warnings_are_errors)
  89           || (level == DL_PEDWARN && CPP_OPTION (pfile, pedantic_errors)))
  90         {
  91           if (CPP_OPTION (pfile, inhibit_errors))
  92             return 0;
  93           level = DL_ERROR;
  94           pfile->errors++;
  95         }
  96       else if (CPP_OPTION (pfile, inhibit_warnings))
  97         return 0;
  98       break;
  99
 100     case DL_ERROR:
 101       if (CPP_OPTION (pfile, inhibit_errors))
 102         return 0;
 103       /* ICEs cannot be inhibited.  */
 104     case DL_ICE:
 105       pfile->errors++;
 106       break;
 107     }
 108
 109   print_location (pfile, line, column);
 110   if (DL_WARNING_P (level))
 111     fputs (_("warning: "), stderr);
 112   else if (level == DL_ICE)
 113     fputs (_("internal error: "), stderr);
 114
 115   return 1;
 116 }
 117
 118 /* Don't remove the blank before do, as otherwise the exgettext
 119    script will mistake this as a function definition */
 120 #define v_message(msgid, ap) \
 121  do { vfprintf (stderr, _(msgid), ap); putc ('\n', stderr); } while (0)
 122
 123 /* Exported interface.  */
 124
 125 /* Print an error at the location of the previously lexed token.  */
 126 void
 127 cpp_error (cpp_reader * pfile, int level, const char *msgid, ...)
 128 {
 129   unsigned int line, column;
 130   va_list ap;
 131
 132   va_start (ap, msgid);
 133
 134   if (pfile->buffer)
 135     {
 136       if (CPP_OPTION (pfile, traditional))
 137         {
 138           if (pfile->state.in_directive)
 139             line = pfile->directive_line;
 140           else
 141             line = pfile->line;
 142           column = 0;
 143         }
 144       else
 145         {
 146           line = pfile->cur_token[-1].line;
 147           column = pfile->cur_token[-1].col;
 148         }
 149     }
 150   else
 151     line = column = 0;
 152
 153   if (_cpp_begin_message (pfile, level, line, column))
 154     v_message (msgid, ap);
 155
 156   va_end (ap);
 157 }
 158
 159 /* Print an error at a specific location.  */
 160 void
 161 cpp_error_with_line (cpp_reader *pfile, int level,
 162                      unsigned int line, unsigned int column,
 163                      const char *msgid, ...)
 164 {
 165   va_list ap;
 166
 167   va_start (ap, msgid);
 168
 169   if (_cpp_begin_message (pfile, level, line, column))
 170     v_message (msgid, ap);
 171
 172   va_end (ap);
 173 }
 174
 175 void
 176 cpp_errno (cpp_reader *pfile, int level, const char *msgid)
 177 {
 178   if (msgid[0] == '\0')
 179     msgid = _("stdout");
 180
 181   cpp_error (pfile, level, "%s: %s", msgid, xstrerror (errno));
 182 }