gcc/diagnostic.h

   1 /* Various declarations for language-independent diagnostics subroutines.
   2    Copyright (C) 2000-2014 Free Software Foundation, Inc.
   3    Contributed by Gabriel Dos Reis <gdr@codesourcery.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_DIAGNOSTIC_H
  22 #define GCC_DIAGNOSTIC_H
  23
  24 #include "pretty-print.h"
  25 #include "diagnostic-core.h"
  26
  27 /* A diagnostic is described by the MESSAGE to send, the FILE and LINE of
  28    its context and its KIND (ice, error, warning, note, ...)  See complete
  29    list in diagnostic.def.  */
  30 struct diagnostic_info
  31 {
  32   text_info message;
  33   location_t location;
  34   unsigned int override_column;
  35   /* Auxiliary data for client.  */
  36   void *x_data;
  37   /* The kind of diagnostic it is about.  */
  38   diagnostic_t kind;
  39   /* Which OPT_* directly controls this diagnostic.  */
  40   int option_index;
  41 };
  42
  43 /* Each time a diagnostic's classification is changed with a pragma,
  44    we record the change and the location of the change in an array of
  45    these structs.  */
  46 struct diagnostic_classification_change_t
  47 {
  48   location_t location;
  49   int option;
  50   diagnostic_t kind;
  51 };
  52
  53 /*  Forward declarations.  */
  54 typedef void (*diagnostic_starter_fn) (diagnostic_context *,
  55                                        diagnostic_info *);
  56 typedef diagnostic_starter_fn diagnostic_finalizer_fn;
  57
  58 /* This data structure bundles altogether any information relevant to
  59    the context of a diagnostic message.  */
  60 struct diagnostic_context
  61 {
  62   /* Where most of the diagnostic formatting work is done.  */
  63   pretty_printer *printer;
  64
  65   /* The number of times we have issued diagnostics.  */
  66   int diagnostic_count[DK_LAST_DIAGNOSTIC_KIND];
  67
  68   /* True if we should display the "warnings are being tread as error"
  69      message, usually displayed once per compiler run.  */
  70   bool some_warnings_are_errors;
  71
  72   /* True if it has been requested that warnings be treated as errors.  */
  73   bool warning_as_error_requested;
  74
  75   /* The number of option indexes that can be passed to warning() et
  76      al.  */
  77   int n_opts;
  78
  79   /* For each option index that can be passed to warning() et al
  80      (OPT_* from options.h when using this code with the core GCC
  81      options), this array may contain a new kind that the diagnostic
  82      should be changed to before reporting, or DK_UNSPECIFIED to leave
  83      it as the reported kind, or DK_IGNORED to not report it at
  84      all.  */
  85   diagnostic_t *classify_diagnostic;
  86
  87   /* History of all changes to the classifications above.  This list
  88      is stored in location-order, so we can search it, either
  89      binary-wise or end-to-front, to find the most recent
  90      classification for a given diagnostic, given the location of the
  91      diagnostic.  */
  92   diagnostic_classification_change_t *classification_history;
  93
  94   /* The size of the above array.  */
  95   int n_classification_history;
  96
  97   /* For pragma push/pop.  */
  98   int *push_list;
  99   int n_push;
 100
 101   /* True if we should print the source line with a caret indicating
 102      the location.  */
 103   bool show_caret;
 104
 105   /* Maximum width of the source line printed.  */
 106   int caret_max_width;
 107
 108   /* Character used for caret diagnostics.  */
 109   char caret_char;
 110
 111   /* True if we should print the command line option which controls
 112      each diagnostic, if known.  */
 113   bool show_option_requested;
 114
 115   /* True if we should raise a SIGABRT on errors.  */
 116   bool abort_on_error;
 117
 118   /* True if we should show the column number on diagnostics.  */
 119   bool show_column;
 120
 121   /* True if pedwarns are errors.  */
 122   bool pedantic_errors;
 123
 124   /* True if permerrors are warnings.  */
 125   bool permissive;
 126
 127   /* The index of the option to associate with turning permerrors into
 128      warnings.  */
 129   int opt_permissive;
 130
 131   /* True if errors are fatal.  */
 132   bool fatal_errors;
 133
 134   /* True if all warnings should be disabled.  */
 135   bool dc_inhibit_warnings;
 136
 137   /* True if warnings should be given in system headers.  */
 138   bool dc_warn_system_headers;
 139
 140   /* Maximum number of errors to report.  */
 141   unsigned int max_errors;
 142
 143   /* This function is called before any message is printed out.  It is
 144      responsible for preparing message prefix and such.  For example, it
 145      might say:
 146      In file included from "/usr/local/include/curses.h:5:
 147                       from "/home/gdr/src/nifty_printer.h:56:
 148                       ...
 149   */
 150   diagnostic_starter_fn begin_diagnostic;
 151
 152   /* This function is called after the diagnostic message is printed.  */
 153   diagnostic_finalizer_fn end_diagnostic;
 154
 155   /* Client hook to report an internal error.  */
 156   void (*internal_error) (diagnostic_context *, const char *, va_list *);
 157
 158   /* Client hook to say whether the option controlling a diagnostic is
 159      enabled.  Returns nonzero if enabled, zero if disabled.  */
 160   int (*option_enabled) (int, void *);
 161
 162   /* Client information to pass as second argument to
 163      option_enabled.  */
 164   void *option_state;
 165
 166   /* Client hook to return the name of an option that controls a
 167      diagnostic.  Returns malloced memory.  The first diagnostic_t
 168      argument is the kind of diagnostic before any reclassification
 169      (of warnings as errors, etc.); the second is the kind after any
 170      reclassification.  May return NULL if no name is to be printed.
 171      May be passed 0 as well as the index of a particular option.  */
 172   char *(*option_name) (diagnostic_context *, int, diagnostic_t, diagnostic_t);
 173
 174   /* Auxiliary data for client.  */
 175   void *x_data;
 176
 177   /* Used to detect that the last caret was printed at the same location.  */
 178   location_t last_location;
 179
 180   /* Used to detect when the input file stack has changed since last
 181      described.  */
 182   const struct line_map *last_module;
 183
 184   int lock;
 185
 186   bool inhibit_notes_p;
 187 };
 188
 189 static inline void
 190 diagnostic_inhibit_notes (diagnostic_context * context)
 191 {
 192   context->inhibit_notes_p = true;
 193 }
 194
 195
 196 /* Client supplied function to announce a diagnostic.  */
 197 #define diagnostic_starter(DC) (DC)->begin_diagnostic
 198
 199 /* Client supplied function called after a diagnostic message is
 200    displayed.  */
 201 #define diagnostic_finalizer(DC) (DC)->end_diagnostic
 202
 203 /* Extension hooks for client.  */
 204 #define diagnostic_context_auxiliary_data(DC) (DC)->x_data
 205 #define diagnostic_info_auxiliary_data(DI) (DI)->x_data
 206
 207 /* Same as pp_format_decoder.  Works on 'diagnostic_context *'.  */
 208 #define diagnostic_format_decoder(DC) ((DC)->printer->format_decoder)
 209
 210 /* Same as output_prefixing_rule.  Works on 'diagnostic_context *'.  */
 211 #define diagnostic_prefixing_rule(DC) ((DC)->printer->wrapping.rule)
 212
 213 /* Maximum characters per line in automatic line wrapping mode.
 214    Zero means don't wrap lines.  */
 215 #define diagnostic_line_cutoff(DC) ((DC)->printer->wrapping.line_cutoff)
 216
 217 #define diagnostic_flush_buffer(DC) pp_flush ((DC)->printer)
 218
 219 /* True if the last module or file in which a diagnostic was reported is
 220    different from the current one.  */
 221 #define diagnostic_last_module_changed(DC, MAP) \
 222   ((DC)->last_module != MAP)
 223
 224 /* Remember the current module or file as being the last one in which we
 225    report a diagnostic.  */
 226 #define diagnostic_set_last_module(DC, MAP)     \
 227   (DC)->last_module = MAP
 228
 229 /* Raise SIGABRT on any diagnostic of severity DK_ERROR or higher.  */
 230 #define diagnostic_abort_on_error(DC) \
 231   (DC)->abort_on_error = true
 232
 233 /* This diagnostic_context is used by front-ends that directly output
 234    diagnostic messages without going through `error', `warning',
 235    and similar functions.  */
 236 extern diagnostic_context *global_dc;
 237
 238 /* The total count of a KIND of diagnostics emitted so far.  */
 239 #define diagnostic_kind_count(DC, DK) (DC)->diagnostic_count[(int) (DK)]
 240
 241 /* The number of errors that have been issued so far.  Ideally, these
 242    would take a diagnostic_context as an argument.  */
 243 #define errorcount diagnostic_kind_count (global_dc, DK_ERROR)
 244 /* Similarly, but for warnings.  */
 245 #define warningcount diagnostic_kind_count (global_dc, DK_WARNING)
 246 /* Similarly, but for warnings promoted to errors.  */
 247 #define werrorcount diagnostic_kind_count (global_dc, DK_WERROR)
 248 /* Similarly, but for sorrys.  */
 249 #define sorrycount diagnostic_kind_count (global_dc, DK_SORRY)
 250
 251 /* Returns nonzero if warnings should be emitted.  */
 252 #define diagnostic_report_warnings_p(DC, LOC)                           \
 253   (!(DC)->dc_inhibit_warnings                                           \
 254    && !(in_system_header_at (LOC) && !(DC)->dc_warn_system_headers))
 255
 256 #define report_diagnostic(D) diagnostic_report_diagnostic (global_dc, D)
 257
 258 /* Override the column number to be used for reporting a
 259    diagnostic.  */
 260 #define diagnostic_override_column(DI, COL) (DI)->override_column = (COL)
 261
 262 /* Override the option index to be used for reporting a
 263    diagnostic.  */
 264 #define diagnostic_override_option_index(DI, OPTIDX) \
 265     ((DI)->option_index = (OPTIDX))
 266
 267 /* Diagnostic related functions.  */
 268 extern void diagnostic_initialize (diagnostic_context *, int);
 269 extern void diagnostic_color_init (diagnostic_context *, int value = -1);
 270 extern void diagnostic_finish (diagnostic_context *);
 271 extern void diagnostic_report_current_module (diagnostic_context *, location_t);
 272 extern void diagnostic_show_locus (diagnostic_context *, const diagnostic_info *);
 273
 274 /* Force diagnostics controlled by OPTIDX to be kind KIND.  */
 275 extern diagnostic_t diagnostic_classify_diagnostic (diagnostic_context *,
 276                                                     int /* optidx */,
 277                                                     diagnostic_t /* kind */,
 278                                                     location_t);
 279 extern void diagnostic_push_diagnostics (diagnostic_context *, location_t);
 280 extern void diagnostic_pop_diagnostics (diagnostic_context *, location_t);
 281 extern bool diagnostic_report_diagnostic (diagnostic_context *,
 282                                           diagnostic_info *);
 283 #ifdef ATTRIBUTE_GCC_DIAG
 284 extern void diagnostic_set_info (diagnostic_info *, const char *, va_list *,
 285                                  location_t, diagnostic_t) ATTRIBUTE_GCC_DIAG(2,0);
 286 extern void diagnostic_set_info_translated (diagnostic_info *, const char *,
 287                                             va_list *, location_t,
 288                                             diagnostic_t)
 289      ATTRIBUTE_GCC_DIAG(2,0);
 290 extern void diagnostic_append_note (diagnostic_context *, location_t,
 291                                     const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 292 #endif
 293 extern char *diagnostic_build_prefix (diagnostic_context *, const diagnostic_info *);
 294 void default_diagnostic_starter (diagnostic_context *, diagnostic_info *);
 295 void default_diagnostic_finalizer (diagnostic_context *, diagnostic_info *);
 296 void diagnostic_set_caret_max_width (diagnostic_context *context, int value);
 297 void diagnostic_action_after_output (diagnostic_context *, diagnostic_t);
 298
 299 void diagnostic_file_cache_fini (void);
 300
 301 int get_terminal_width (void);
 302
 303 /* Expand the location of this diagnostic. Use this function for consistency. */
 304
 305 static inline expanded_location
 306 diagnostic_expand_location (const diagnostic_info * diagnostic)
 307 {
 308   expanded_location s
 309     = expand_location_to_spelling_point (diagnostic->location);
 310   if (diagnostic->override_column)
 311     s.column = diagnostic->override_column;
 312   return s;
 313 }
 314
 315 /* Pure text formatting support functions.  */
 316 extern char *file_name_as_prefix (diagnostic_context *, const char *);
 317
 318 extern char *build_message_string (const char *, ...) ATTRIBUTE_PRINTF_1;
 319
 320
 321 #endif /* ! GCC_DIAGNOSTIC_H */