gcc/pretty-print.h

   1 /* Various declarations for language-independent pretty-print subroutines.
   2    Copyright (C) 2002, 2003, 2004, 2007, 2008, 2009, 2010
   3    Free Software Foundation, Inc.
   4    Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_PRETTY_PRINT_H
  23 #define GCC_PRETTY_PRINT_H
  24
  25 #include "obstack.h"
  26 #include "input.h"
  27
  28 /* Maximum number of format string arguments.  */
  29 #define PP_NL_ARGMAX   30
  30
  31 /* The type of a text to be formatted according a format specification
  32    along with a list of things.  */
  33 typedef struct
  34 {
  35   const char *format_spec;
  36   va_list *args_ptr;
  37   int err_no;  /* for %m */
  38   location_t *locus;
  39   void **x_data;
  40 } text_info;
  41
  42 /* How often diagnostics are prefixed by their locations:
  43    o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  44    o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once;
  45    o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical
  46    line is started.  */
  47 typedef enum
  48 {
  49   DIAGNOSTICS_SHOW_PREFIX_ONCE       = 0x0,
  50   DIAGNOSTICS_SHOW_PREFIX_NEVER      = 0x1,
  51   DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2
  52 } diagnostic_prefixing_rule_t;
  53
  54 /* The chunk_info data structure forms a stack of the results from the
  55    first phase of formatting (pp_base_format) which have not yet been
  56    output (pp_base_output_formatted_text).  A stack is necessary because
  57    the diagnostic starter may decide to generate its own output by way
  58    of the formatter.  */
  59 struct chunk_info
  60 {
  61   /* Pointer to previous chunk on the stack.  */
  62   struct chunk_info *prev;
  63
  64   /* Array of chunks to output.  Each chunk is a NUL-terminated string.
  65      In the first phase of formatting, even-numbered chunks are
  66      to be output verbatim, odd-numbered chunks are format specifiers.
  67      The second phase replaces all odd-numbered chunks with formatted
  68      text, and the third phase simply emits all the chunks in sequence
  69      with appropriate line-wrapping.  */
  70   const char *args[PP_NL_ARGMAX * 2];
  71 };
  72
  73 /* The output buffer datatype.  This is best seen as an abstract datatype
  74    whose fields should not be accessed directly by clients.  */
  75 typedef struct
  76 {
  77   /* Obstack where the text is built up.  */
  78   struct obstack formatted_obstack;
  79
  80   /* Obstack containing a chunked representation of the format
  81      specification plus arguments.  */
  82   struct obstack chunk_obstack;
  83
  84   /* Currently active obstack: one of the above two.  This is used so
  85      that the text formatters don't need to know which phase we're in.  */
  86   struct obstack *obstack;
  87
  88   /* Stack of chunk arrays.  These come from the chunk_obstack.  */
  89   struct chunk_info *cur_chunk_array;
  90
  91   /* Where to output formatted text.  */
  92   FILE *stream;
  93
  94   /* The amount of characters output so far.  */
  95   int line_length;
  96
  97   /* This must be large enough to hold any printed integer or
  98      floating-point value.  */
  99   char digit_buffer[128];
 100 } output_buffer;
 101
 102 /* The type of pretty-printer flags passed to clients.  */
 103 typedef unsigned int pp_flags;
 104
 105 typedef enum
 106 {
 107   pp_none, pp_before, pp_after
 108 } pp_padding;
 109
 110 /* Structure for switching in and out of verbatim mode in a convenient
 111    manner.  */
 112 typedef struct
 113 {
 114   /* Current prefixing rule.  */
 115   diagnostic_prefixing_rule_t rule;
 116
 117   /* The ideal upper bound of number of characters per line, as suggested
 118      by front-end.  */
 119   int line_cutoff;
 120 } pp_wrapping_mode_t;
 121
 122 /* Maximum characters per line in automatic line wrapping mode.
 123    Zero means don't wrap lines.  */
 124 #define pp_line_cutoff(PP)  pp_base (PP)->wrapping.line_cutoff
 125
 126 /* Prefixing rule used in formatting a diagnostic message.  */
 127 #define pp_prefixing_rule(PP)  pp_base (PP)->wrapping.rule
 128
 129 /* Get or set the wrapping mode as a single entity.  */
 130 #define pp_wrapping_mode(PP) pp_base (PP)->wrapping
 131
 132 /* The type of a hook that formats client-specific data onto a pretty_pinter.
 133    A client-supplied formatter returns true if everything goes well,
 134    otherwise it returns false.  */
 135 typedef struct pretty_print_info pretty_printer;
 136 typedef bool (*printer_fn) (pretty_printer *, text_info *, const char *,
 137                             int, bool, bool, bool);
 138
 139 /* Client supplied function used to decode formats.  */
 140 #define pp_format_decoder(PP) pp_base (PP)->format_decoder
 141
 142 /* TRUE if a newline character needs to be added before further
 143    formatting.  */
 144 #define pp_needs_newline(PP)  pp_base (PP)->need_newline
 145
 146 /* True if PRETTY-PRINTER is in line-wrapping mode.  */
 147 #define pp_is_wrapping_line(PP) (pp_line_cutoff (PP) > 0)
 148
 149 /* The amount of whitespace to be emitted when starting a new line.  */
 150 #define pp_indentation(PP) pp_base (PP)->indent_skip
 151
 152 /* True if identifiers are translated to the locale character set on
 153    output.  */
 154 #define pp_translate_identifiers(PP) pp_base (PP)->translate_identifiers
 155
 156 /* The data structure that contains the bare minimum required to do
 157    proper pretty-printing.  Clients may derived from this structure
 158    and add additional fields they need.  */
 159 struct pretty_print_info
 160 {
 161   /* Where we print external representation of ENTITY.  */
 162   output_buffer *buffer;
 163
 164   /* The prefix for each new line.  */
 165   const char *prefix;
 166
 167   /* Where to put whitespace around the entity being formatted.  */
 168   pp_padding padding;
 169
 170   /* The real upper bound of number of characters per line, taking into
 171      account the case of a very very looong prefix.  */
 172   int maximum_length;
 173
 174   /* Indentation count.  */
 175   int indent_skip;
 176
 177   /* Current wrapping mode.  */
 178   pp_wrapping_mode_t wrapping;
 179
 180   /* If non-NULL, this function formats a TEXT into the BUFFER.  When called,
 181      TEXT->format_spec points to a format code.  FORMAT_DECODER should call
 182      pp_string (and related functions) to add data to the BUFFER.
 183      FORMAT_DECODER can read arguments from *TEXT->args_pts using VA_ARG.
 184      If the BUFFER needs additional characters from the format string, it
 185      should advance the TEXT->format_spec as it goes.  When FORMAT_DECODER
 186      returns, TEXT->format_spec should point to the last character processed.
 187   */
 188   printer_fn format_decoder;
 189
 190   /* Nonzero if current PREFIX was emitted at least once.  */
 191   bool emitted_prefix;
 192
 193   /* Nonzero means one should emit a newline before outputting anything.  */
 194   bool need_newline;
 195
 196   /* Nonzero means identifiers are translated to the locale character
 197      set on output.  */
 198   bool translate_identifiers;
 199 };
 200
 201 #define pp_set_line_maximum_length(PP, L) \
 202    pp_base_set_line_maximum_length (pp_base (PP), L)
 203 #define pp_set_prefix(PP, P)    pp_base_set_prefix (pp_base (PP), P)
 204 #define pp_destroy_prefix(PP)   pp_base_destroy_prefix (pp_base (PP))
 205 #define pp_remaining_character_count_for_line(PP) \
 206   pp_base_remaining_character_count_for_line (pp_base (PP))
 207 #define pp_clear_output_area(PP) \
 208   pp_base_clear_output_area (pp_base (PP))
 209 #define pp_formatted_text(PP)   pp_base_formatted_text (pp_base (PP))
 210 #define pp_last_position_in_text(PP) \
 211   pp_base_last_position_in_text (pp_base (PP))
 212 #define pp_emit_prefix(PP)      pp_base_emit_prefix (pp_base (PP))
 213 #define pp_append_text(PP, B, E) \
 214   pp_base_append_text (pp_base (PP), B, E)
 215 #define pp_flush(PP)            pp_base_flush (pp_base (PP))
 216 #define pp_format(PP, TI)       pp_base_format (pp_base (PP), TI)
 217 #define pp_output_formatted_text(PP) \
 218   pp_base_output_formatted_text (pp_base (PP))
 219 #define pp_format_verbatim(PP, TI) \
 220   pp_base_format_verbatim (pp_base (PP), TI)
 221
 222 #define pp_character(PP, C)     pp_base_character (pp_base (PP), C)
 223 #define pp_string(PP, S)        pp_base_string (pp_base (PP), S)
 224 #define pp_newline(PP)          pp_base_newline (pp_base (PP))
 225
 226 #define pp_space(PP)            pp_character (PP, ' ')
 227 #define pp_left_paren(PP)       pp_character (PP, '(')
 228 #define pp_right_paren(PP)      pp_character (PP, ')')
 229 #define pp_left_bracket(PP)     pp_character (PP, '[')
 230 #define pp_right_bracket(PP)    pp_character (PP, ']')
 231 #define pp_left_brace(PP)       pp_character (PP, '{')
 232 #define pp_right_brace(PP)      pp_character (PP, '}')
 233 #define pp_semicolon(PP)        pp_character (PP, ';')
 234 #define pp_comma(PP)            pp_string (PP, ", ")
 235 #define pp_dot(PP)              pp_character (PP, '.')
 236 #define pp_colon(PP)            pp_character (PP, ':')
 237 #define pp_colon_colon(PP)      pp_string (PP, "::")
 238 #define pp_arrow(PP)            pp_string (PP, "->")
 239 #define pp_equal(PP)            pp_character (PP, '=')
 240 #define pp_question(PP)         pp_character (PP, '?')
 241 #define pp_bar(PP)              pp_character (PP, '|')
 242 #define pp_carret(PP)           pp_character (PP, '^')
 243 #define pp_ampersand(PP)        pp_character (PP, '&')
 244 #define pp_less(PP)             pp_character (PP, '<')
 245 #define pp_greater(PP)          pp_character (PP, '>')
 246 #define pp_plus(PP)             pp_character (PP, '+')
 247 #define pp_minus(PP)            pp_character (PP, '-')
 248 #define pp_star(PP)             pp_character (PP, '*')
 249 #define pp_slash(PP)            pp_character (PP, '/')
 250 #define pp_modulo(PP)           pp_character (PP, '%')
 251 #define pp_exclamation(PP)      pp_character (PP, '!')
 252 #define pp_complement(PP)       pp_character (PP, '~')
 253 #define pp_quote(PP)            pp_character (PP, '\'')
 254 #define pp_backquote(PP)        pp_character (PP, '`')
 255 #define pp_doublequote(PP)      pp_character (PP, '"')
 256 #define pp_newline_and_indent(PP, N) \
 257   do {                               \
 258     pp_indentation (PP) += N;        \
 259     pp_newline (PP);                 \
 260     pp_base_indent (pp_base (PP));   \
 261     pp_needs_newline (PP) = false;   \
 262   } while (0)
 263 #define pp_maybe_newline_and_indent(PP, N) \
 264   if (pp_needs_newline (PP)) pp_newline_and_indent (PP, N)
 265 #define pp_maybe_space(PP)   pp_base_maybe_space (pp_base (PP))
 266 #define pp_separate_with(PP, C)     \
 267    do {                             \
 268      pp_character (PP, C);          \
 269      pp_space (PP);                 \
 270    } while (0)
 271 #define pp_scalar(PP, FORMAT, SCALAR)                         \
 272   do                                                          \
 273     {                                                         \
 274       sprintf (pp_buffer (PP)->digit_buffer, FORMAT, SCALAR); \
 275       pp_string (PP, pp_buffer (PP)->digit_buffer);           \
 276     }                                                         \
 277   while (0)
 278 #define pp_decimal_int(PP, I)  pp_scalar (PP, "%d", I)
 279 #define pp_unsigned_wide_integer(PP, I) \
 280    pp_scalar (PP, HOST_WIDE_INT_PRINT_UNSIGNED, (unsigned HOST_WIDE_INT) I)
 281 #define pp_wide_integer(PP, I) \
 282    pp_scalar (PP, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT) I)
 283 #define pp_widest_integer(PP, I) \
 284    pp_scalar (PP, HOST_WIDEST_INT_PRINT_DEC, (HOST_WIDEST_INT) I)
 285 #define pp_pointer(PP, P)      pp_scalar (PP, "%p", P)
 286
 287 #define pp_identifier(PP, ID)  pp_string (PP, (pp_translate_identifiers (PP) \
 288                                           ? identifier_to_locale (ID)   \
 289                                           : (ID)))
 290
 291
 292 #define pp_buffer(PP) pp_base (PP)->buffer
 293 /* Clients that directly derive from pretty_printer need to override
 294    this macro to return a pointer to the base pretty_printer structure.  */
 295 #define pp_base(PP) (PP)
 296
 297 extern void pp_construct (pretty_printer *, const char *, int);
 298 extern void pp_base_set_line_maximum_length (pretty_printer *, int);
 299 extern void pp_base_set_prefix (pretty_printer *, const char *);
 300 extern void pp_base_destroy_prefix (pretty_printer *);
 301 extern int pp_base_remaining_character_count_for_line (pretty_printer *);
 302 extern void pp_base_clear_output_area (pretty_printer *);
 303 extern const char *pp_base_formatted_text (pretty_printer *);
 304 extern const char *pp_base_last_position_in_text (const pretty_printer *);
 305 extern void pp_base_emit_prefix (pretty_printer *);
 306 extern void pp_base_append_text (pretty_printer *, const char *, const char *);
 307
 308 /* If we haven't already defined a front-end-specific diagnostics
 309    style, use the generic one.  */
 310 #ifdef GCC_DIAG_STYLE
 311 #define GCC_PPDIAG_STYLE GCC_DIAG_STYLE
 312 #else
 313 #define GCC_PPDIAG_STYLE __gcc_diag__
 314 #endif
 315
 316 /* This header may be included before diagnostics-core.h, hence the duplicate
 317    definitions to allow for GCC-specific formats.  */
 318 #if GCC_VERSION >= 3005
 319 #define ATTRIBUTE_GCC_PPDIAG(m, n) __attribute__ ((__format__ (GCC_PPDIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 320 #else
 321 #define ATTRIBUTE_GCC_PPDIAG(m, n) ATTRIBUTE_NONNULL(m)
 322 #endif
 323 extern void pp_printf (pretty_printer *, const char *, ...)
 324      ATTRIBUTE_GCC_PPDIAG(2,3);
 325
 326 extern void pp_verbatim (pretty_printer *, const char *, ...)
 327      ATTRIBUTE_GCC_PPDIAG(2,3);
 328 extern void pp_base_flush (pretty_printer *);
 329 extern void pp_base_format (pretty_printer *, text_info *);
 330 extern void pp_base_output_formatted_text (pretty_printer *);
 331 extern void pp_base_format_verbatim (pretty_printer *, text_info *);
 332
 333 extern void pp_base_indent (pretty_printer *);
 334 extern void pp_base_newline (pretty_printer *);
 335 extern void pp_base_character (pretty_printer *, int);
 336 extern void pp_base_string (pretty_printer *, const char *);
 337 extern void pp_write_text_to_stream (pretty_printer *pp);
 338 extern void pp_base_maybe_space (pretty_printer *);
 339
 340 /* Switch into verbatim mode and return the old mode.  */
 341 static inline pp_wrapping_mode_t
 342 pp_set_verbatim_wrapping_ (pretty_printer *pp)
 343 {
 344   pp_wrapping_mode_t oldmode = pp_wrapping_mode (pp);
 345   pp_line_cutoff (pp) = 0;
 346   pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_NEVER;
 347   return oldmode;
 348 }
 349 #define pp_set_verbatim_wrapping(PP) pp_set_verbatim_wrapping_ (pp_base (PP))
 350
 351 extern const char *identifier_to_locale (const char *);
 352 extern void *(*identifier_to_locale_alloc) (size_t);
 353 extern void (*identifier_to_locale_free) (void *);
 354
 355 #endif /* GCC_PRETTY_PRINT_H */