gcc/diagnostic.h

   1 /* Various declarations for language-independent diagnostics subroutines.
   2    Copyright (C) 2000, 2001 Free Software Foundation, Inc.
   3    Contributed by Gabriel Dos Reis <gdr@codesourcery.com>
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 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   int emitted_prefix_p;
  80
  81   /* Nonzero means one should emit a newline before outputing anything.  */
  82   int 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
 121 #define output_buffer_state(BUFFER) (BUFFER)->state
 122 #define output_buffer_attached_stream(BUFFER) (BUFFER)->stream
 123 #define output_buffer_text_cursor(BUFFER) (BUFFER)->state.cursor
 124 #define output_buffer_format_args(BUFFER) *((BUFFER)->state.format_args)
 125 #define output_needs_newline(BUFFER) (BUFFER)->state.need_newline_p
 126 #define output_buffer_state(BUFFER) (BUFFER)->state
 127 #define output_indentation(BUFFER) (BUFFER)->state.indent_skip
 128 #define output_message_text(BUFFER) \
 129    ((const char *) obstack_base (&(BUFFER)->obstack))
 130
 131 /* This data structure bundles altogether any information relevant to
 132    the context of a diagnostic message.  */
 133 struct diagnostic_context
 134 {
 135   /* The diagnostic message to output.  */
 136   const char *message;
 137
 138   /* A pointer to a variable list of the arguments necessary for the
 139      purpose of message formatting.  */
 140   va_list *args_ptr;
 141
 142   /* The name of the source file involved in the diiagnostic.  */
 143   const char *file;
 144
 145   /* The line-location in the source file.  */
 146   int line;
 147
 148   /* Is this message a warning?  */
 149   int warn;
 150
 151   /* This function is called before any message is printed out.  It is
 152      responsible for preparing message prefix and such.  For example, it
 153      might say:
 154      In file included from "/usr/local/include/curses.h:5:
 155                       from "/home/gdr/src/nifty_printer.h:56:
 156                       ...
 157   */
 158   void (*begin_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 159
 160   /* This function is called after the diagnostic message is printed.   */
 161   void (*end_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 162
 163   /* Hook for front-end extensions.  */
 164   void *x_data;
 165 };
 166
 167 #define diagnostic_message(DC) (DC)->message
 168 #define diagnostic_argument_list(DC) (DC)->args_ptr
 169 #define diagnostic_file_location(DC) (DC)->file
 170 #define diagnostic_line_location(DC) (DC)->line
 171 #define diagnostic_is_warning(DC) (DC)->warn
 172 #define diagnostic_starter(DC) (DC)->begin_diagnostic
 173 #define diagnostic_finalizer(DC) (DC)->end_diagnostic
 174 #define diagnostic_auxiliary_data(DC) (DC)->x_data
 175
 176 /* If non-NULL, this function formats data in the BUFFER. When called,
 177    output_buffer_text_cursor (BUFFER) points to a format code.  LANG_PRINTER
 178    should call output_add_string (and related functions) to add data to
 179    the BUFFER.  LANG_PRINTER can read arguments from
 180    output_buffer_format_args (BUFFER) using VA_ARG.  If the BUFFER needs
 181    additional characters from the format string, it should advance
 182    the output_buffer_text_cursor (BUFFER) as it goes.  When LANG_PRINTER
 183    returns, output_buffer_text_cursor (BUFFER) should point to the last
 184    character processed.  */
 185
 186 extern printer_fn lang_printer;
 187
 188 extern diagnostic_starter_fn lang_diagnostic_starter;
 189 extern diagnostic_finalizer_fn lang_diagnostic_finalizer;
 190
 191 extern int diagnostic_message_length_per_line;
 192
 193 /* This output buffer is used by front-ends that directly output
 194    diagnostic messages without going through `error', `warning',
 195    and similar functions.  In general, such usage should be
 196    avoided.  This global buffer will go away, once all such usage
 197    has been removed.  */
 198 extern output_buffer *diagnostic_buffer;
 199
 200 #define diagnostic_kind_count(BUFFER, DK) \
 201    (BUFFER)->state.diagnostic_count[(int) DK]
 202
 203 /* The number of errors that have been issued so far.  Ideally, these
 204    would take an output_buffer as an argument.  */
 205 #define errorcount diagnostic_kind_count (diagnostic_buffer, DK_ERROR)
 206 /* Similarly, but for warnings.  */
 207 #define warningcount diagnostic_kind_count (diagnostic_buffer, DK_WARNING)
 208 /* Similarly, but for sorrys.  */
 209 #define sorrycount diagnostic_kind_count (diagnostic_buffer, DK_SORRY)
 210
 211 /* Returns non-zero if warnings should be emitted.  */
 212 #define diagnostic_report_warnings_p()                  \
 213   (!inhibit_warnings                                    \
 214    && !(in_system_header && !warn_system_headers))
 215
 216
 217 /* Prototypes */
 218 extern void set_diagnostic_context      PARAMS ((diagnostic_context *,
 219                                                  const char *, va_list *,
 220                                                  const char *, int, int));
 221 extern void set_internal_error_function PARAMS ((void (*)
 222                                                  PARAMS ((const char *,
 223                                                           va_list *))));
 224 extern void report_diagnostic           PARAMS ((diagnostic_context *));
 225 extern void initialize_diagnostics      PARAMS ((void));
 226 extern void reshape_diagnostic_buffer   PARAMS ((void));
 227 extern void default_initialize_buffer   PARAMS ((output_buffer *));
 228 extern void init_output_buffer          PARAMS ((output_buffer *,
 229                                                  const char *, int));
 230 extern void flush_diagnostic_buffer     PARAMS ((void));
 231 extern void output_clear                PARAMS ((output_buffer *));
 232 extern const char *output_get_prefix    PARAMS ((const output_buffer *));
 233 extern const char *output_last_position PARAMS ((const output_buffer *));
 234 extern void output_set_prefix           PARAMS ((output_buffer *,
 235                                                  const char *));
 236 extern void output_destroy_prefix       PARAMS ((output_buffer *));
 237 extern void output_set_maximum_length   PARAMS ((output_buffer *, int));
 238 extern void output_emit_prefix          PARAMS ((output_buffer *));
 239 extern void output_add_newline          PARAMS ((output_buffer *));
 240 extern void output_add_space            PARAMS ((output_buffer *));
 241 extern int output_space_left            PARAMS ((const output_buffer *));
 242 extern void output_append               PARAMS ((output_buffer *, const char *,
 243                                                  const char *));
 244 extern void output_add_character        PARAMS ((output_buffer *, int));
 245 extern void output_decimal              PARAMS ((output_buffer *, int));
 246 extern void output_add_string           PARAMS ((output_buffer *,
 247                                                  const char *));
 248 extern const char *output_finalize_message PARAMS ((output_buffer *));
 249 extern void output_clear_message_text   PARAMS ((output_buffer *));
 250 extern void output_printf               PARAMS ((output_buffer *, const char *,
 251                                                  ...)) ATTRIBUTE_PRINTF_2;
 252 extern int output_is_line_wrapping      PARAMS ((output_buffer *));
 253 extern void set_message_prefixing_rule  PARAMS ((diagnostic_prefixing_rule_t));
 254 extern void output_verbatim             PARAMS ((output_buffer *, const char *,
 255                                                  ...)) ATTRIBUTE_PRINTF_2;
 256 extern void verbatim                    PARAMS ((const char *, ...))
 257      ATTRIBUTE_PRINTF_1;
 258 extern char *context_as_prefix          PARAMS ((const char *, int, int));
 259 extern char *file_name_as_prefix        PARAMS ((const char *));
 260 extern int error_module_changed         PARAMS ((void));
 261 extern void record_last_error_module    PARAMS ((void));
 262 extern int error_function_changed       PARAMS ((void));
 263 extern void record_last_error_function  PARAMS ((void));
 264 extern void report_problematic_module   PARAMS ((output_buffer *));
 265
 266 #endif /* ! GCC_DIAGNOSTIC_H */