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
  30 #define DIAGNOSTICS_SHOW_PREFIX_ONCE       0x0
  31 #define DIAGNOSTICS_SHOW_PREFIX_NEVER      0x1
  32 #define DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE 0x2
  33
  34 /* The type of front-end specific hook that formats trees into an
  35    output_buffer.  A language specific printer returns a truth value if
  36    everything goes well. */
  37 typedef int (*printer_fn) PARAMS ((output_buffer *));
  38
  39 /* This data structure encapulates an output_buffer's state.  */
  40 typedef struct
  41 {
  42   /* The prefix for each new line.   */
  43   const char *prefix;
  44   /* The real upper bound of number of characters per line, taking into
  45      accompt the case of a very very looong prefix.  */
  46   int maximum_length;
  47   /* The ideal upper bound of number of characters per line, as suggested
  48      by front-end. */
  49   int ideal_maximum_length;
  50   /* Nonzero if current PREFIX was emitted at least once.  */
  51   int emitted_prefix_p;
  52   /* Tells how often current PREFIX should be emitted:
  53      o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  54      o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit current PREFIX only once;
  55      o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit current PREFIX each time
  56        a physical line is started.  */
  57   int prefixing_rule;
  58   /* The current char to output.  Updated by front-end (*format_map) when
  59      it is called to report front-end printer for a specified format.  */
  60   const char *cursor;
  61   /* A pointer to the variable argument-list for formatting.  */
  62   va_list *format_args;
  63 } output_state;
  64
  65 /* The output buffer datatype.  This is best seen as an abstract datatype.  */
  66 struct output_buffer
  67 {
  68   /* Internal data.  These fields should not be accessed directly by
  69      front-ends.  */
  70
  71   /* The obstack where the text is built up.  */
  72   struct obstack obstack;
  73   /* The amount of characters output so far.  */
  74   int line_length;
  75   /* The current state of the buffer.  */
  76   output_state state;
  77 };
  78
  79 #define output_buffer_text_cursor(BUFFER) (BUFFER)->state.cursor
  80 #define output_buffer_format_args(BUFFER) *((BUFFER)->state.format_args)
  81
  82 /* If non-NULL, this function formats data in the BUFFER. When called,
  83    output_buffer_text_cursor (BUFFER) points to a format code.  LANG_PRINTER
  84    should call output_add_string (and related functions) to add data to
  85    the BUFFER.  LANG_PRINTER can read arguments from
  86    output_buffer_format_args (BUFFER) using VA_ARG.  If the BUFFER needs
  87    additional characters from the format string, it should advance
  88    the output_buffer_text_cursor (BUFFER) as it goes.  When LANG_PRINTER
  89    returns, output_buffer_text_cursor (BUFFER) should point to the last
  90    character processed.  */
  91
  92 extern printer_fn lang_printer;
  93
  94 extern int diagnostic_message_length_per_line;
  95
  96 /* This output buffer is used by front-ends that directly output
  97    diagnostic messages without going through `error', `warning',
  98    and simillar functions.  In general, such usage should be
  99    avoided.  This global buffer will go away, once all such usage
 100    has been removed.  */
 101 extern output_buffer *diagnostic_buffer;
 102
 103 /* Prototypes */
 104 void report_diagnostic          PARAMS ((const char *, va_list *,
 105                                          const char *, int, int));
 106 void initialize_diagnostics     PARAMS ((void));
 107 void reshape_diagnostic_buffer  PARAMS ((void));
 108 void default_initialize_buffer  PARAMS ((output_buffer *));
 109 void init_output_buffer         PARAMS ((output_buffer *, const char *, int));
 110 void output_clear               PARAMS ((output_buffer *));
 111 const char *output_get_prefix   PARAMS ((const output_buffer *));
 112 void output_set_prefix          PARAMS ((output_buffer *, const char *));
 113 void output_destroy_prefix      PARAMS ((output_buffer *));
 114 void output_set_maximum_length  PARAMS ((output_buffer *, int));
 115 void output_emit_prefix         PARAMS ((output_buffer *));
 116 void output_add_newline         PARAMS ((output_buffer *));
 117 void output_add_space           PARAMS ((output_buffer *));
 118 int output_space_left           PARAMS ((const output_buffer *));
 119 void output_append              PARAMS ((output_buffer *, const char *,
 120                                          const char *));
 121 void output_add_character       PARAMS ((output_buffer *, int));
 122 void output_decimal             PARAMS ((output_buffer *, int));
 123 void output_add_string          PARAMS ((output_buffer *, const char *));
 124 const char *output_finish       PARAMS ((output_buffer *));
 125 void output_printf              PARAMS ((output_buffer *, const char *,
 126                                          ...)) ATTRIBUTE_PRINTF_2;
 127 int output_is_line_wrapping     PARAMS ((output_buffer *));
 128 void set_message_prefixing_rule PARAMS ((int));
 129 void output_verbatim            PARAMS ((output_buffer *, const char *, ...))
 130      ATTRIBUTE_PRINTF_2;
 131 void verbatim PARAMS ((const char *, ...)) ATTRIBUTE_PRINTF_1;
 132
 133 #endif /* __GCC_DIAGNOSTIC_H__ */