gcc/diagnostic.h

   1 /* Various declarations for language-independent diagnostics subroutines.
   2    Copyright (C) 2000 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 #define DIAGNOSTICS_SHOW_PREFIX_ONCE       0x0
  35 #define DIAGNOSTICS_SHOW_PREFIX_NEVER      0x1
  36 #define DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE 0x2
  37
  38 /* The type of front-end specific hook that formats trees into an
  39    output_buffer.  A language specific printer returns a truth value if
  40    everything goes well. */
  41 typedef int (*printer_fn) PARAMS ((output_buffer *));
  42
  43 /* This data structure encapulates an output_buffer's state.  */
  44 typedef struct
  45 {
  46   /* The prefix for each new line.   */
  47   const char *prefix;
  48   /* The real upper bound of number of characters per line, taking into
  49      accompt the case of a very very looong prefix.  */
  50   int maximum_length;
  51   /* The ideal upper bound of number of characters per line, as suggested
  52      by front-end. */
  53   int ideal_maximum_length;
  54   /* Nonzero if current PREFIX was emitted at least once.  */
  55   int emitted_prefix_p;
  56
  57   /* Nonzero means one should emit a newline before outputing anything.  */
  58   int need_newline_p;
  59
  60   /* Tells how often current PREFIX should be emitted:
  61      o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  62      o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit current PREFIX only once;
  63      o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit current PREFIX each time
  64        a physical line is started.  */
  65   int prefixing_rule;
  66   /* The current char to output.  Updated by front-end (*format_map) when
  67      it is called to report front-end printer for a specified format.  */
  68   const char *cursor;
  69   /* A pointer to the variable argument-list for formatting.  */
  70   va_list *format_args;
  71 } output_state;
  72
  73 /* The output buffer datatype.  This is best seen as an abstract datatype.  */
  74 struct output_buffer
  75 {
  76   /* Internal data.  These fields should not be accessed directly by
  77      front-ends.  */
  78
  79   /* The obstack where the text is built up.  */
  80   struct obstack obstack;
  81   /* The amount of characters output so far.  */
  82   int line_length;
  83   /* The current state of the buffer.  */
  84   output_state state;
  85 };
  86
  87 #define output_buffer_text_cursor(BUFFER) (BUFFER)->state.cursor
  88 #define output_buffer_format_args(BUFFER) *((BUFFER)->state.format_args)
  89 #define output_needs_newline(BUFFER) (BUFFER)->state.need_newline_p
  90 #define output_buffer_state(BUFFER) (BUFFER)->state
  91
  92 /* This data structure bundles altogether any information relevent to
  93    the context of a diagnostic message.  */
  94 struct diagnostic_context
  95 {
  96   /* The diagnostic message to output.  */
  97   const char *message;
  98
  99   /* A pointer to a variable list of the arguments necessary for the
 100      purpose of  message formatting.  */
 101   va_list *args_ptr;
 102
 103   /* The name of the source file involved in the diiagnostic.  */
 104   const char *file;
 105
 106   /* The line-location in the source file.  */
 107   int line;
 108
 109   /* Is it message a warning?  */
 110   int warn;
 111
 112   /* This function is called before any message is printed out.  It is
 113      respondible for preparing message prefix and such.  For example, it
 114      might say:
 115      In file included from "/usr/local/include/curses.h:5:
 116                       from "/home/gdr/src/nifty_printer.h:56:
 117                       ...
 118   */
 119   void (*begin_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 120
 121   /* This function is called after the diagnostic message is printed.   */
 122   void (*end_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 123
 124   /* Hook for front-end extensions.  */
 125   void *x_data;
 126 };
 127
 128 #define diagnostic_message(DC) (DC)->message
 129 #define diagnostic_argument_list(DC) (DC)->args_ptr
 130 #define diagnostic_file_location(DC) (DC)->file
 131 #define diagnostic_line_location(DC) (DC)->line
 132 #define diagnostic_is_warning(DC) (DC)->warn
 133 #define diagnostic_starter(DC) (DC)->begin_diagnostic
 134 #define diagnostic_finalizer(DC) (DC)->end_diagnostic
 135 #define diagnostic_auxiliary_data(DC) (DC)->x_data
 136
 137 /* If non-NULL, this function formats data in the BUFFER. When called,
 138    output_buffer_text_cursor (BUFFER) points to a format code.  LANG_PRINTER
 139    should call output_add_string (and related functions) to add data to
 140    the BUFFER.  LANG_PRINTER can read arguments from
 141    output_buffer_format_args (BUFFER) using VA_ARG.  If the BUFFER needs
 142    additional characters from the format string, it should advance
 143    the output_buffer_text_cursor (BUFFER) as it goes.  When LANG_PRINTER
 144    returns, output_buffer_text_cursor (BUFFER) should point to the last
 145    character processed.  */
 146
 147 extern printer_fn lang_printer;
 148
 149 extern diagnostic_starter_fn lang_diagnostic_starter;
 150 extern diagnostic_finalizer_fn lang_diagnostic_finalizer;
 151
 152 extern int diagnostic_message_length_per_line;
 153
 154 /* This output buffer is used by front-ends that directly output
 155    diagnostic messages without going through `error', `warning',
 156    and simillar functions.  In general, such usage should be
 157    avoided.  This global buffer will go away, once all such usage
 158    has been removed.  */
 159 extern output_buffer *diagnostic_buffer;
 160
 161 /* Prototypes */
 162 void set_diagnostic_context     PARAMS ((diagnostic_context *, const char *,
 163                                          va_list *, const char *, int, int));
 164 void set_fatal_function         PARAMS ((void (*) PARAMS ((const char *,
 165                                                            va_list *))));
 166 void report_diagnostic          PARAMS ((diagnostic_context *));
 167 void initialize_diagnostics     PARAMS ((void));
 168 void reshape_diagnostic_buffer  PARAMS ((void));
 169 void default_initialize_buffer  PARAMS ((output_buffer *));
 170 void init_output_buffer         PARAMS ((output_buffer *, const char *, int));
 171 void output_clear               PARAMS ((output_buffer *));
 172 const char *output_get_prefix   PARAMS ((const output_buffer *));
 173 void output_set_prefix          PARAMS ((output_buffer *, const char *));
 174 void output_destroy_prefix      PARAMS ((output_buffer *));
 175 void output_set_maximum_length  PARAMS ((output_buffer *, int));
 176 void output_emit_prefix         PARAMS ((output_buffer *));
 177 void output_add_newline         PARAMS ((output_buffer *));
 178 void output_add_space           PARAMS ((output_buffer *));
 179 int output_space_left           PARAMS ((const output_buffer *));
 180 void output_append              PARAMS ((output_buffer *, const char *,
 181                                          const char *));
 182 void output_add_character       PARAMS ((output_buffer *, int));
 183 void output_decimal             PARAMS ((output_buffer *, int));
 184 void output_add_string          PARAMS ((output_buffer *, const char *));
 185 const char *output_finish       PARAMS ((output_buffer *));
 186 void output_printf              PARAMS ((output_buffer *, const char *,
 187                                          ...)) ATTRIBUTE_PRINTF_2;
 188 int output_is_line_wrapping     PARAMS ((output_buffer *));
 189 void set_message_prefixing_rule PARAMS ((int));
 190 void output_verbatim            PARAMS ((output_buffer *, const char *, ...))
 191      ATTRIBUTE_PRINTF_2;
 192 void verbatim PARAMS ((const char *, ...)) ATTRIBUTE_PRINTF_1;
 193 char *context_as_prefix         PARAMS ((const char *, int, int));
 194 char *file_name_as_prefix       PARAMS ((const char *));
 195 int error_module_changed        PARAMS ((void));
 196 void record_last_error_module   PARAMS ((void));
 197 int error_function_changed      PARAMS ((void));
 198 void record_last_error_function PARAMS ((void));
 199 void report_problematic_module  PARAMS ((output_buffer *));
 200
 201 #endif /* __GCC_DIAGNOSTIC_H__ */