gcc/pretty-print.h

   1 /* Various declarations for language-independent pretty-print subroutines.
   2    Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   3    Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
   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_PRETTY_PRINT_H
  23 #define GCC_PRETTY_PRINT_H
  24
  25 #include "obstack.h"
  26 #include "input.h"
  27
  28 /* The type of a text to be formatted according a format specification
  29    along with a list of things.  */
  30 typedef struct
  31 {
  32   const char *format_spec;
  33   va_list *args_ptr;
  34   int err_no;  /* for %m */
  35 } text_info;
  36
  37 /* How often diagnostics are prefixed by their locations:
  38    o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  39    o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once;
  40    o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical
  41    line is started.  */
  42 typedef enum
  43 {
  44   DIAGNOSTICS_SHOW_PREFIX_ONCE       = 0x0,
  45   DIAGNOSTICS_SHOW_PREFIX_NEVER      = 0x1,
  46   DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2
  47 } diagnostic_prefixing_rule_t;
  48
  49 /* The output buffer datatype.  This is best seen as an abstract datatype
  50    whose fields should not be accessed directly by clients.  */
  51 typedef struct
  52 {
  53   /* The obstack where the text is built up.  */
  54   struct obstack obstack;
  55
  56   /* Where to output formatted text.  */
  57   FILE *stream;
  58
  59   /* The amount of characters output so far.  */
  60   int line_length;
  61
  62   /* This must be large enough to hold any printed integer or
  63      floating-point value.  */
  64   char digit_buffer[128];
  65 } output_buffer;
  66
  67 /* The type of pretty-printer flags passed to clients.  */
  68 typedef unsigned int pp_flags;
  69
  70 typedef enum
  71 {
  72   pp_none, pp_before, pp_after
  73 } pp_padding;
  74
  75 /* The type of a hook that formats client-specific data onto a pretty_pinter.
  76    A client-supplied formatter returns true if everything goes well,
  77    otherwise it returns false.  */
  78 typedef struct pretty_print_info pretty_printer;
  79 typedef bool (*printer_fn) (pretty_printer *, text_info *);
  80
  81 /* Client supplied function used to decode formats.  */
  82 #define pp_format_decoder(PP) pp_base (PP)->format_decoder
  83
  84 /* TRUE if a newline character needs to be added before further
  85    formatting.  */
  86 #define pp_needs_newline(PP)  pp_base (PP)->need_newline
  87
  88 /* Maximum characters per line in automatic line wrapping mode.
  89    Zero means don't wrap lines.  */
  90 #define pp_line_cutoff(PP)  pp_base (PP)->ideal_maximum_length
  91
  92 /* True if PRETTY-PTINTER is in line-wrapping mode.  */
  93 #define pp_is_wrapping_line(PP) (pp_line_cutoff (PP) > 0)
  94
  95 /* Prefixing rule used in formatting a diagnostic message.  */
  96 #define pp_prefixing_rule(PP)  pp_base (PP)->prefixing_rule
  97
  98 /* The amount of whitespace to be emitted when starting a new line.  */
  99 #define pp_indentation(PP) pp_base (PP)->indent_skip
 100
 101 /* The data structure that contains the bare minimum required to do
 102    proper pretty-printing.  Clients may derived from this structure
 103    and add additional fields they need.  */
 104 struct pretty_print_info
 105 {
 106   /* Where we print external representation of ENTITY.  */
 107   output_buffer *buffer;
 108
 109   /* The prefix for each new line.  */
 110   const char *prefix;
 111
 112   pp_flags flags;
 113
 114   /* Where to put whitespace around the entity being formatted.  */
 115   pp_padding padding;
 116
 117   /* The real upper bound of number of characters per line, taking into
 118      account the case of a very very looong prefix.  */
 119   int maximum_length;
 120
 121   /* The ideal upper bound of number of characters per line, as suggested
 122      by front-end.  */
 123   int ideal_maximum_length;
 124
 125   /* Indentation count.  */
 126   int indent_skip;
 127
 128   /* Current prefixing rule.  */
 129   diagnostic_prefixing_rule_t prefixing_rule;
 130
 131   /* If non-NULL, this function formats a TEXT into the BUFFER.  When called,
 132      TEXT->format_spec points to a format code.  FORMAT_DECODER should call
 133      pp_string (and related functions) to add data to the BUFFER.
 134      FORMAT_DECODER can read arguments from *TEXT->args_pts using VA_ARG.
 135      If the BUFFER needs additional characters from the format string, it
 136      should advance the TEXT->format_spec as it goes.  When FORMAT_DECODER
 137      returns, TEXT->format_spec should point to the last character processed.
 138   */
 139   printer_fn format_decoder;
 140
 141   /* Nonzero if current PREFIX was emitted at least once.  */
 142   bool emitted_prefix;
 143
 144   /* Nonzero means one should emit a newline before outputting anything.  */
 145   bool need_newline;
 146 };
 147
 148 #define pp_space(PP)            pp_character (pp_base (PP), ' ')
 149 #define pp_left_paren(PP)       pp_character (pp_base (PP), '(')
 150 #define pp_right_paren(PP)      pp_character (pp_base (PP), ')')
 151 #define pp_left_bracket(PP)     pp_character (pp_base (PP), '[')
 152 #define pp_right_bracket(PP)    pp_character (pp_base (PP), ']')
 153 #define pp_left_brace(PP)       pp_character (pp_base (PP), '{')
 154 #define pp_right_brace(PP)      pp_character (pp_base (PP), '}')
 155 #define pp_semicolon(PP)        pp_character (pp_base (PP), ';')
 156 #define pp_comma(PP)            pp_string (pp_base (PP), ", ")
 157 #define pp_dot(PP)              pp_character (pp_base (PP), '.')
 158 #define pp_colon(PP)            pp_character (pp_base (PP), ':')
 159 #define pp_colon_colon(PP)      pp_string (pp_base (PP), "::")
 160 #define pp_arrow(PP)            pp_string (pp_base (PP), "->")
 161 #define pp_equal(PP)            pp_character (pp_base (PP), '=')
 162 #define pp_question(PP)         pp_character (pp_base (PP), '?')
 163 #define pp_bar(PP)              pp_character (pp_base (PP), '|')
 164 #define pp_carret(PP)           pp_character (pp_base (PP), '^')
 165 #define pp_ampersand(PP)        pp_character (pp_base (PP), '&')
 166 #define pp_less(PP)             pp_character (pp_base (PP), '<')
 167 #define pp_greater(PP)          pp_character (pp_base (PP), '>')
 168 #define pp_plus(PP)             pp_character (pp_base (PP), '+')
 169 #define pp_minus(PP)            pp_character (pp_base (PP), '-')
 170 #define pp_star(PP)             pp_character (pp_base (PP), '*')
 171 #define pp_slash(PP)            pp_character (pp_base (PP), '/')
 172 #define pp_modulo(PP)           pp_character (pp_base (PP), '%')
 173 #define pp_exclamation(PP)      pp_character (pp_base (PP), '!')
 174 #define pp_complement(PP)       pp_character (pp_base (PP), '~')
 175 #define pp_quote(PP)            pp_character (pp_base (PP), '\'')
 176 #define pp_backquote(PP)        pp_character (pp_base (PP), '`')
 177 #define pp_doublequote(PP)      pp_character (pp_base (PP), '"')
 178 #define pp_newline_and_indent(PP, N) \
 179   do {                               \
 180     pp_indentation (PP) += N;        \
 181     pp_newline (PP);                 \
 182   } while (0)
 183 #define pp_separate_with(PP, C)     \
 184    do {                             \
 185      pp_character (pp_base (PP), C);\
 186      pp_space (PP);                 \
 187    } while (0)
 188 #define pp_scalar(PP, FORMAT, SCALAR)                               \
 189   do                                                                \
 190     {                                                               \
 191       sprintf (pp_base (PP)->buffer->digit_buffer, FORMAT, SCALAR); \
 192       pp_string (pp_base (PP), pp_base (PP)->buffer->digit_buffer); \
 193     }                                                               \
 194   while (0)
 195 #define pp_decimal_int(PP, I)  pp_scalar (PP, "%d", I)
 196 #define pp_wide_integer(PP, I) \
 197    pp_scalar (PP, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT) I)
 198 #define pp_pointer(PP, P)      pp_scalar (PP, "%p", P)
 199
 200 #define pp_identifier(PP, ID)  pp_string (pp_base (PP), ID)
 201 #define pp_tree_identifier(PP, T)                      \
 202   pp_append_text(pp_base (PP), IDENTIFIER_POINTER (T), \
 203                  IDENTIFIER_POINTER (T) + IDENTIFIER_LENGTH (T))
 204
 205 #define pp_unsupported_tree(PP, T) \
 206   pp_verbatim (pp_base (PP), "#`%s' not supported by %s#",\
 207                    tree_code_name[(int) TREE_CODE (T)], __FUNCTION__)
 208
 209
 210 /* Clients that directly derive from pretty_printer need to override
 211    this macro to return a pointer to the base pretty_printer structrure.  */
 212 #define pp_base(PP) (PP)
 213
 214 extern void pp_construct (pretty_printer *, const char *, int);
 215 extern void pp_set_line_maximum_length (pretty_printer *, int);
 216 extern void pp_set_prefix (pretty_printer *, const char *);
 217 extern void pp_destroy_prefix (pretty_printer *);
 218 extern int pp_remaining_character_count_for_line (pretty_printer *);
 219 extern void pp_clear_output_area (pretty_printer *);
 220 extern const char *pp_formatted_text (pretty_printer *);
 221 extern const char *pp_last_position_in_text (const pretty_printer *);
 222 extern void pp_emit_prefix (pretty_printer *);
 223 extern void pp_append_text (pretty_printer *, const char *, const char *);
 224 extern void pp_printf (pretty_printer *, const char *, ...) ATTRIBUTE_PRINTF_2;
 225 extern void pp_verbatim (pretty_printer *, const char *, ...);
 226 extern void pp_flush (pretty_printer *);
 227 extern void pp_format_text (pretty_printer *, text_info *);
 228 extern void pp_format_verbatim (pretty_printer *, text_info *);
 229
 230 extern void pp_newline (pretty_printer *);
 231 extern void pp_character (pretty_printer *, int);
 232 extern void pp_string (pretty_printer *, const char *);
 233
 234 #endif /* GCC_PRETTY_PRINT_H */