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 #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 encapsulates 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      account 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
  55   /* Indentation count.  */
  56   int indent_skip;
  57
  58   /* Nonzero if current PREFIX was emitted at least once.  */
  59   int emitted_prefix_p;
  60
  61   /* Nonzero means one should emit a newline before outputing anything.  */
  62   int need_newline_p;
  63
  64   /* Tells how often current PREFIX should be emitted:
  65      o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  66      o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit current PREFIX only once;
  67      o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit current PREFIX each time
  68        a physical line is started.  */
  69   int prefixing_rule;
  70   /* The current char to output.  Updated by front-end (*format_map) when
  71      it is called to report front-end printer for a specified format.  */
  72   const char *cursor;
  73   /* A pointer to the variable argument-list for formatting.  */
  74   va_list *format_args;
  75 } output_state;
  76
  77 /* The output buffer datatype.  This is best seen as an abstract datatype.  */
  78 struct output_buffer
  79 {
  80   /* Internal data.  These fields should not be accessed directly by
  81      front-ends.  */
  82
  83   /* Where to output formatted text.  */
  84   FILE* stream;
  85   /* The obstack where the text is built up.  */
  86   struct obstack obstack;
  87   /* The amount of characters output so far.  */
  88   int line_length;
  89   /* The current state of the buffer.  */
  90   output_state state;
  91 };
  92
  93 #define output_buffer_attached_stream(BUFFER) (BUFFER)->stream
  94 #define output_buffer_text_cursor(BUFFER) (BUFFER)->state.cursor
  95 #define output_buffer_format_args(BUFFER) *((BUFFER)->state.format_args)
  96 #define output_needs_newline(BUFFER) (BUFFER)->state.need_newline_p
  97 #define output_buffer_state(BUFFER) (BUFFER)->state
  98 #define output_indentation(BUFFER) (BUFFER)->state.indent_skip
  99 #define output_message_text(BUFFER) \
 100    ((const char *) obstack_base (&(BUFFER)->obstack))
 101
 102 /* This data structure bundles altogether any information relevant to
 103    the context of a diagnostic message.  */
 104 struct diagnostic_context
 105 {
 106   /* The diagnostic message to output.  */
 107   const char *message;
 108
 109   /* A pointer to a variable list of the arguments necessary for the
 110      purpose of message formatting.  */
 111   va_list *args_ptr;
 112
 113   /* The name of the source file involved in the diiagnostic.  */
 114   const char *file;
 115
 116   /* The line-location in the source file.  */
 117   int line;
 118
 119   /* Is this message a warning?  */
 120   int warn;
 121
 122   /* This function is called before any message is printed out.  It is
 123      responsible for preparing message prefix and such.  For example, it
 124      might say:
 125      In file included from "/usr/local/include/curses.h:5:
 126                       from "/home/gdr/src/nifty_printer.h:56:
 127                       ...
 128   */
 129   void (*begin_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 130
 131   /* This function is called after the diagnostic message is printed.   */
 132   void (*end_diagnostic) PARAMS ((output_buffer *, diagnostic_context *));
 133
 134   /* Hook for front-end extensions.  */
 135   void *x_data;
 136 };
 137
 138 #define diagnostic_message(DC) (DC)->message
 139 #define diagnostic_argument_list(DC) (DC)->args_ptr
 140 #define diagnostic_file_location(DC) (DC)->file
 141 #define diagnostic_line_location(DC) (DC)->line
 142 #define diagnostic_is_warning(DC) (DC)->warn
 143 #define diagnostic_starter(DC) (DC)->begin_diagnostic
 144 #define diagnostic_finalizer(DC) (DC)->end_diagnostic
 145 #define diagnostic_auxiliary_data(DC) (DC)->x_data
 146
 147 /* If non-NULL, this function formats data in the BUFFER. When called,
 148    output_buffer_text_cursor (BUFFER) points to a format code.  LANG_PRINTER
 149    should call output_add_string (and related functions) to add data to
 150    the BUFFER.  LANG_PRINTER can read arguments from
 151    output_buffer_format_args (BUFFER) using VA_ARG.  If the BUFFER needs
 152    additional characters from the format string, it should advance
 153    the output_buffer_text_cursor (BUFFER) as it goes.  When LANG_PRINTER
 154    returns, output_buffer_text_cursor (BUFFER) should point to the last
 155    character processed.  */
 156
 157 extern printer_fn lang_printer;
 158
 159 extern diagnostic_starter_fn lang_diagnostic_starter;
 160 extern diagnostic_finalizer_fn lang_diagnostic_finalizer;
 161
 162 extern int diagnostic_message_length_per_line;
 163
 164 /* This output buffer is used by front-ends that directly output
 165    diagnostic messages without going through `error', `warning',
 166    and similar functions.  In general, such usage should be
 167    avoided.  This global buffer will go away, once all such usage
 168    has been removed.  */
 169 extern output_buffer *diagnostic_buffer;
 170
 171 /* Prototypes */
 172 extern void set_diagnostic_context      PARAMS ((diagnostic_context *,
 173                                                  const char *, va_list *,
 174                                                  const char *, int, int));
 175 extern void set_internal_error_function PARAMS ((void (*)
 176                                                  PARAMS ((const char *,
 177                                                           va_list *))));
 178 extern void report_diagnostic           PARAMS ((diagnostic_context *));
 179 extern void initialize_diagnostics      PARAMS ((void));
 180 extern void reshape_diagnostic_buffer   PARAMS ((void));
 181 extern void default_initialize_buffer   PARAMS ((output_buffer *));
 182 extern void init_output_buffer          PARAMS ((output_buffer *,
 183                                                  const char *, int));
 184 extern void flush_diagnostic_buffer     PARAMS ((void));
 185 extern void output_clear                PARAMS ((output_buffer *));
 186 extern const char *output_get_prefix    PARAMS ((const output_buffer *));
 187 extern const char *output_last_position PARAMS ((const output_buffer *));
 188 extern void output_set_prefix           PARAMS ((output_buffer *,
 189                                                  const char *));
 190 extern void output_destroy_prefix       PARAMS ((output_buffer *));
 191 extern void output_set_maximum_length   PARAMS ((output_buffer *, int));
 192 extern void output_emit_prefix          PARAMS ((output_buffer *));
 193 extern void output_add_newline          PARAMS ((output_buffer *));
 194 extern void output_add_space            PARAMS ((output_buffer *));
 195 extern int output_space_left            PARAMS ((const output_buffer *));
 196 extern void output_append               PARAMS ((output_buffer *, const char *,
 197                                                  const char *));
 198 extern void output_add_character        PARAMS ((output_buffer *, int));
 199 extern void output_decimal              PARAMS ((output_buffer *, int));
 200 extern void output_add_string           PARAMS ((output_buffer *,
 201                                                  const char *));
 202 extern const char *output_finalize_message PARAMS ((output_buffer *));
 203 extern void output_clear_message_text   PARAMS ((output_buffer *));
 204 extern void output_printf               PARAMS ((output_buffer *, const char *,
 205                                                  ...)) ATTRIBUTE_PRINTF_2;
 206 extern int output_is_line_wrapping      PARAMS ((output_buffer *));
 207 extern void set_message_prefixing_rule  PARAMS ((int));
 208 extern void output_verbatim             PARAMS ((output_buffer *, const char *,
 209                                                  ...)) ATTRIBUTE_PRINTF_2;
 210 extern void verbatim                    PARAMS ((const char *, ...))
 211      ATTRIBUTE_PRINTF_1;
 212 extern char *context_as_prefix          PARAMS ((const char *, int, int));
 213 extern char *file_name_as_prefix        PARAMS ((const char *));
 214 extern int error_module_changed         PARAMS ((void));
 215 extern void record_last_error_module    PARAMS ((void));
 216 extern int error_function_changed       PARAMS ((void));
 217 extern void record_last_error_function  PARAMS ((void));
 218 extern void report_problematic_module   PARAMS ((output_buffer *));
 219
 220 #endif /* __GCC_DIAGNOSTIC_H__ */