gcc/diagnostic.h

   1 /* Various declarations for language-independent diagnostics subroutines.
   2    Copyright (C) 2000, 2001, 2002 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 2, 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 COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_DIAGNOSTIC_H
  23 #define GCC_DIAGNOSTIC_H
  24
  25 #include "obstack.h"
  26
  27 /*  Forward declarations.  */
  28 typedef struct output_buffer output_buffer;
  29 typedef struct diagnostic_context diagnostic_context;
  30 typedef void (*diagnostic_starter_fn) PARAMS ((output_buffer *,
  31                                                diagnostic_context *));
  32 typedef diagnostic_starter_fn diagnostic_finalizer_fn;
  33
  34 typedef enum
  35 {
  36 #define DEFINE_DIAGNOSTIC_KIND(K, M) K,
  37 #include "diagnostic.def"
  38 #undef DEFINE_DIAGNOSTIC_KIND
  39   DK_LAST_DIAGNOSTIC_KIND
  40 } diagnostic_t;
  41
  42 #define pedantic_error_kind() (flag_pedantic_errors ? DK_ERROR : DK_WARNING)
  43
  44 /* How often diagnostics are prefixed by their locations:
  45    o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  46    o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once;
  47    o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical
  48    line is started.  */
  49 typedef enum
  50 {
  51   DIAGNOSTICS_SHOW_PREFIX_ONCE       = 0x0,
  52   DIAGNOSTICS_SHOW_PREFIX_NEVER      = 0x1,
  53   DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2
  54 } diagnostic_prefixing_rule_t;
  55
  56 /* The type of front-end specific hook that formats trees into an
  57    output_buffer.  A language specific printer returns a truth value if
  58    everything goes well.  */
  59 typedef int (*printer_fn) PARAMS ((output_buffer *));
  60
  61 /* This data structure encapsulates an output_buffer's state.  */
  62 typedef struct
  63 {
  64   /* The prefix for each new line.  */
  65   const char *prefix;
  66
  67   /* The real upper bound of number of characters per line, taking into
  68      account the case of a very very looong prefix.  */
  69   int maximum_length;
  70
  71   /* The ideal upper bound of number of characters per line, as suggested
  72      by front-end.  */
  73   int ideal_maximum_length;
  74
  75   /* Indentation count.  */
  76   int indent_skip;
  77
  78   /* Nonzero if current PREFIX was emitted at least once.  */
  79   bool emitted_prefix_p;
  80
  81   /* Nonzero means one should emit a newline before outputing anything.  */
  82   bool need_newline_p;
  83
  84   /* Current prefixing rule.  */
  85   diagnostic_prefixing_rule_t prefixing_rule;
  86
  87   /* The current char to output.  Updated by front-end (*format_map) when
  88      it is called to report front-end printer for a specified format.  */
  89   const char *cursor;
  90
  91   /* A pointer to the variable argument-list for formatting.  */
  92   va_list *format_args;
  93
  94   /* The number of times we have issued diagnostics.  */
  95   int diagnostic_count[DK_LAST_DIAGNOSTIC_KIND];
  96 } output_state;
  97
  98 /* The output buffer datatype.  This is best seen as an abstract datatype.  */
  99 struct output_buffer
 100 {
 101   /* Internal data.  These fields should not be accessed directly by
 102      front-ends.  */
 103
 104   /* The current state of the buffer.  */
 105   output_state state;
 106
 107   /* Where to output formatted text.  */
 108   FILE* stream;
 109
 110   /* The obstack where the text is built up.  */
 111   struct obstack obstack;
 112
 113   /* The amount of characters output so far.  */
 114   int line_length;
 115
 116   /* This must be large enough to hold any printed integer or
 117      floating-point value.  */
 118   char digit_buffer[128];
 119
 120 /* If non-NULL, this function formats data in the BUFFER. When called,
 121    output_buffer_text_cursor (BUFFER) points to a format code.
 122    FORMAT_DECODER should call output_add_string (and related functions)
 123    to add data to the BUFFER.  FORMAT_DECODER can read arguments from
 124    output_buffer_format_args (BUFFER) using VA_ARG.  If the BUFFER needs
 125    additional characters from the format string, it should advance
 126    the output_buffer_text_cursor (BUFFER) as it goes.  When FORMAT_DECODER
 127    returns, output_buffer_text_cursor (BUFFER) should point to the last
 128    character processed.  */
 129
 130   printer_fn format_decoder;
 131 };
 132
 133 /* Current state of the diagnostic_context' output_buffer.  This macro
 134    accepts both `diagnostic_context *' and `output_buffer *'.  */
 135 #define output_buffer_state(BUFFER) ((output_buffer *)(BUFFER))->state
 136
 137 /* The stream attached to the output_buffer, where the formatted
 138    diagnostics will ultimately go.  Works only on `output_buffer *'.  */
 139 #define output_buffer_attached_stream(BUFFER) (BUFFER)->stream
 140
 141 /* This points to the beginning of the rest of the diagnostic message
 142    to be formatted.  Accepts only `output_buffer *'s.  */
 143 #define output_buffer_text_cursor(BUFFER) (BUFFER)->state.cursor
 144
 145 /* The rest of the `variable argument list' not yet processed.
 146    This macro works on both `output_state *' and `output_buffer *'.  */
 147 #define output_buffer_format_args(BUFFER) \
 148    *(((output_state *)(BUFFER))->format_args)
 149
 150 /* In line-wrapping mode, whether we should start a new line.  */
 151 #define output_needs_newline(BUFFER) (BUFFER)->state.need_newline_p
 152
 153 /* The amount of whitespace to be emitted when starting a new line.  */
 154 #define output_indentation(BUFFER) (BUFFER)->state.indent_skip
 155
 156 /* A pointer to the formatted diagonstic message.  */
 157 #define output_message_text(BUFFER) \
 158    ((const char *) obstack_base (&(BUFFER)->obstack))
 159
 160 /* This data structure bundles altogether any information relevant to
 161    the context of a diagnostic message.  */
 162 struct diagnostic_context
 163 {
 164   /* Where most of the diagnostic formatting work is done.  In Object
 165      Oriented terms, we'll say that diagnostic_context is a sub-class of
 166      output_buffer.  */
 167   output_buffer buffer;
 168
 169   /* The diagnostic message to output.  */
 170   const char *message;
 171
 172   /* A pointer to a variable list of the arguments necessary for the
 173      purpose of message formatting.  */
 174   va_list *args_ptr;
 175
 176   /* The name of the source file involved in the diiagnostic.  */
 177   const char *file;
 178
 179   /* The line-location in the source file.  */
 180   int line;
 181
 182   /* Is this message a warning?  */
 183   int warn;
 184
 185   /* This function is called before any message is printed out.  It is
 186      responsible for preparing message prefix and such.  For example, it
 187      might say:
 188      In file included from "/usr/local/include/curses.h:5:
 189                       from "/home/gdr/src/nifty_printer.h:56:
 190                       ...
 191   */
 192   void (*begin_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 193
 194   /* This function is called after the diagnostic message is printed.  */
 195   void (*end_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 196
 197   /* Hook for front-end extensions.  */
 198   void *x_data;
 199 };
 200
 201 /* The diagnostic message being formatted.  */
 202 #define diagnostic_message(DC) (DC)->message
 203
 204 /* A pointer to the variable argument list used in a call
 205    to a diagonstic routine.  */
 206 #define diagnostic_argument_list(DC) (DC)->args_ptr
 207
 208 /* The program file to which the diagnostic is referring to.  */
 209 #define diagnostic_file_location(DC) (DC)->file
 210
 211 /* The program source line referred to in the diagnostic message.  */
 212 #define diagnostic_line_location(DC) (DC)->line
 213
 214 /* Tell whether the diagnostic message is to be treated as a warning.  */
 215 #define diagnostic_is_warning(DC) (DC)->warn
 216
 217 /* Client supplied function to announce a diagnostic.  */
 218 #define diagnostic_starter(DC) (DC)->begin_diagnostic
 219
 220 /* Client supplied function called after a diagnostic message is
 221    displayed.  */
 222 #define diagnostic_finalizer(DC) (DC)->end_diagnostic
 223
 224 /* Extension hook for client.  */
 225 #define diagnostic_auxiliary_data(DC) (DC)->x_data
 226
 227 /* Client supplied function used to decode formats.  Can operate on both
 228  `output_buffer *' and `diagnostic_context *'.  */
 229 #define diagnostic_format_decoder(DC) ((output_buffer *)(DC))->format_decoder
 230
 231 /* Prefixing rule used in formatting a diagnostic message.  Accepts both
 232    `output_buffer *' and `diagnostic_context *'.  */
 233 #define diagnostic_prefixing_rule(DC) \
 234    ((output_buffer *)(DC))->state.prefixing_rule
 235
 236 /* Maximum characters per line in automatic line wrapping mode.
 237    Zero means don't wrap lines.  */
 238 #define diagnostic_line_cutoff(DC) \
 239    ((output_buffer *)(DC))->state.ideal_maximum_length
 240
 241 /* This diagnostic context is used by front-ends that directly output
 242    diagnostic messages without going through `error', `warning',
 243    and similar functions.  */
 244 extern diagnostic_context *global_dc;
 245
 246 /* This will be removed shortly.  */
 247 extern output_buffer *diagnostic_buffer;
 248
 249 /* The total count of a KIND of diagnostics meitted so far.  */
 250 #define diagnostic_kind_count(DC, DK) \
 251    ((output_buffer *)(DC))->state.diagnostic_count[(int) (DK)]
 252
 253 /* The number of errors that have been issued so far.  Ideally, these
 254    would take an output_buffer as an argument.  */
 255 #define errorcount diagnostic_kind_count (global_dc, DK_ERROR)
 256 /* Similarly, but for warnings.  */
 257 #define warningcount diagnostic_kind_count (global_dc, DK_WARNING)
 258 /* Similarly, but for sorrys.  */
 259 #define sorrycount diagnostic_kind_count (global_dc, DK_SORRY)
 260
 261 /* Returns non-zero if warnings should be emitted.  */
 262 #define diagnostic_report_warnings_p()                  \
 263   (!inhibit_warnings                                    \
 264    && !(in_system_header && !warn_system_headers))
 265
 266
 267 /* Prototypes */
 268 extern void set_diagnostic_context      PARAMS ((diagnostic_context *,
 269                                                  const char *, va_list *,
 270                                                  const char *, int, int));
 271 extern void set_internal_error_function PARAMS ((void (*)
 272                                                  PARAMS ((const char *,
 273                                                           va_list *))));
 274 extern void report_diagnostic           PARAMS ((diagnostic_context *));
 275 extern void diagnostic_initialize       PARAMS ((diagnostic_context *));
 276 extern void init_output_buffer          PARAMS ((output_buffer *,
 277                                                  const char *, int));
 278 extern void flush_diagnostic_buffer     PARAMS ((void));
 279 extern void output_clear                PARAMS ((output_buffer *));
 280 extern const char *output_get_prefix    PARAMS ((const output_buffer *));
 281 extern const char *output_last_position PARAMS ((const output_buffer *));
 282 extern void output_set_prefix           PARAMS ((output_buffer *,
 283                                                  const char *));
 284 extern void output_destroy_prefix       PARAMS ((output_buffer *));
 285 extern void output_set_maximum_length   PARAMS ((output_buffer *, int));
 286 extern void output_emit_prefix          PARAMS ((output_buffer *));
 287 extern void output_add_newline          PARAMS ((output_buffer *));
 288 extern void output_add_space            PARAMS ((output_buffer *));
 289 extern int output_space_left            PARAMS ((const output_buffer *));
 290 extern void output_append               PARAMS ((output_buffer *, const char *,
 291                                                  const char *));
 292 extern void output_add_character        PARAMS ((output_buffer *, int));
 293 extern void output_decimal              PARAMS ((output_buffer *, int));
 294 extern void output_add_string           PARAMS ((output_buffer *,
 295                                                  const char *));
 296 extern const char *output_finalize_message PARAMS ((output_buffer *));
 297 extern void output_clear_message_text   PARAMS ((output_buffer *));
 298 extern void output_printf               PARAMS ((output_buffer *, const char *,
 299                                                  ...)) ATTRIBUTE_PRINTF_2;
 300 extern int output_is_line_wrapping      PARAMS ((output_buffer *));
 301 extern void output_verbatim             PARAMS ((output_buffer *, const char *,
 302                                                  ...)) ATTRIBUTE_PRINTF_2;
 303 extern void verbatim                    PARAMS ((const char *, ...))
 304      ATTRIBUTE_PRINTF_1;
 305 extern char *context_as_prefix          PARAMS ((const char *, int, int));
 306 extern char *file_name_as_prefix        PARAMS ((const char *));
 307 extern int error_module_changed         PARAMS ((void));
 308 extern void record_last_error_module    PARAMS ((void));
 309 extern int error_function_changed       PARAMS ((void));
 310 extern void record_last_error_function  PARAMS ((void));
 311 extern void report_problematic_module   PARAMS ((output_buffer *));
 312
 313 /* Called by report_error_function to print out function name.
 314  * Default may be overridden by language front-ends.  */
 315 extern void (*print_error_function) PARAMS ((diagnostic_context *,
 316                                              const char *));
 317
 318 extern void default_print_error_function PARAMS ((diagnostic_context *,
 319                                                   const char *));
 320
 321 #endif /* ! GCC_DIAGNOSTIC_H */