src/complain.h

   1 /* Declaration for error-reporting function for Bison.
   2
   3    Copyright (C) 2000-2002, 2006, 2009-2013 Free Software Foundation,
   4    Inc.
   5
   6    This program is free software: you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation, either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef COMPLAIN_H_
  20 # define COMPLAIN_H_ 1
  21
  22 # include "location.h"
  23
  24 /* Sub-messages indent. */
  25 # define SUB_INDENT (4)
  26
  27 /*-------------.
  28 | --warnings.  |
  29 `-------------*/
  30
  31 /** The bits assigned to each warning type.  */
  32 typedef enum
  33   {
  34     warning_midrule_values, /**< Unset or unused midrule values.  */
  35     warning_yacc,           /**< POSIXME.  */
  36     warning_conflicts_sr,   /**< S/R conflicts.  */
  37     warning_conflicts_rr,   /**< R/R conflicts.  */
  38     warning_empty_rule,     /**< Implicitly empty rules.  */
  39     warning_deprecated,     /**< Obsolete constructs.  */
  40     warning_precedence,     /**< Useless precedence and associativity.  */
  41     warning_other,          /**< All other warnings.  */
  42
  43     warnings_size           /**< The number of warnings.  Must be last.  */
  44   } warning_bit;
  45
  46 /** Whether -Werror was set. */
  47 extern bool warnings_are_errors;
  48
  49 /** Decode a single argument from -W.
  50  *
  51  *  \param arg      the subarguments to decode.
  52  *                  If null, then activate all the flags.
  53  *  \param no       length of the potential "no-" prefix.
  54  *                  Can be 0 or 3. If 3, negate the action of the subargument.
  55  *  \param err      length of a potential "error=".
  56  *                  Can be 0 or 6. If 6, treat the subargument as a CATEGORY.
  57  *
  58  *  If VALUE != 0 then KEY sets flags and no-KEY clears them.
  59  *  If VALUE == 0 then KEY clears all flags from \c all and no-KEY sets all
  60  *  flags from \c all.  Thus no-none = all and no-all = none.
  61  */
  62 void warning_argmatch (char const *arg, size_t no, size_t err);
  63
  64 /** Decode a comma-separated list of arguments from -W.
  65  *
  66  *  \param args     comma separated list of effective subarguments to decode.
  67  *                  If 0, then activate all the flags.
  68  */
  69 void warnings_argmatch (char *args);
  70
  71
  72 /*-----------.
  73 | complain.  |
  74 `-----------*/
  75
  76 /** Initialize this module.  */
  77 void complain_init (void);
  78
  79 typedef enum
  80   {
  81     /**< Issue no warnings.  */
  82     Wnone             = 0,
  83
  84     Wmidrule_values   = 1 << warning_midrule_values,
  85     Wyacc             = 1 << warning_yacc,
  86     Wconflicts_sr     = 1 << warning_conflicts_sr,
  87     Wconflicts_rr     = 1 << warning_conflicts_rr,
  88     Wdeprecated       = 1 << warning_deprecated,
  89     Wempty_rule       = 1 << warning_empty_rule,
  90     Wprecedence       = 1 << warning_precedence,
  91     Wother            = 1 << warning_other,
  92
  93     Werror            = 1 << 10, /** This bit is no longer used. */
  94
  95     complaint         = 1 << 11, /**< All complaints.  */
  96     fatal             = 1 << 12, /**< All fatal errors.  */
  97     silent            = 1 << 13, /**< Do not display the warning type.  */
  98     no_caret          = 1 << 14, /**< Do not display caret location.  */
  99
 100     /**< All above warnings.  */
 101     Wall              = ~complaint & ~fatal & ~silent
 102   } warnings;
 103
 104 /** Whether the warnings of \a flags are all unset.
 105     (Never enabled, never disabled). */
 106 bool warning_is_unset (warnings flags);
 107
 108 /** Make a complaint, with maybe a location.  */
 109 void complain (location const *loc, warnings flags, char const *message, ...)
 110   __attribute__ ((__format__ (__printf__, 3, 4)));
 111
 112 /** Likewise, but with an \a argc/argv interface.  */
 113 void complain_args (location const *loc, warnings w, unsigned *indent,
 114                     int argc, char *arg[]);
 115
 116 /** Make a complaint with location and some indentation.  */
 117 void complain_indent (location const *loc, warnings flags, unsigned *indent,
 118                       char const *message, ...)
 119   __attribute__ ((__format__ (__printf__, 4, 5)));
 120
 121
 122 /** Report an obsolete syntax, suggest the updated one.  */
 123 void deprecated_directive (location const *loc,
 124                            char const *obsolete, char const *updated);
 125
 126 /** Report a repeated directive for a rule.  */
 127 void duplicate_directive (char const *directive,
 128                           location first, location second);
 129
 130 /** Warnings treated as errors shouldn't stop the execution as regular errors
 131     should (because due to their nature, it is safe to go on). Thus, there are
 132     three possible execution statuses.  */
 133 typedef enum
 134   {
 135     status_none,
 136     status_warning_as_error,
 137     status_complaint
 138   } err_status;
 139
 140 /** Whether an error was reported.  */
 141 extern err_status complaint_status;
 142
 143 #endif /* !COMPLAIN_H_ */