gcc/pretty-print.h

   1 /* Various declarations for language-independent pretty-print subroutines.
   2    Copyright (C) 2002-2015 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_PRETTY_PRINT_H
  22 #define GCC_PRETTY_PRINT_H
  23
  24 #include "obstack.h"
  25 #include "wide-int-print.h"
  26
  27 /* Maximum number of format string arguments.  */
  28 #define PP_NL_ARGMAX   30
  29
  30 /* Maximum number of locations associated to each message.  If
  31    location 'i' is UNKNOWN_LOCATION, then location 'i+1' is not
  32    valid.  */
  33 #define MAX_LOCATIONS_PER_MESSAGE 2
  34
  35 /* The type of a text to be formatted according a format specification
  36    along with a list of things.  */
  37 struct text_info
  38 {
  39   const char *format_spec;
  40   va_list *args_ptr;
  41   int err_no;  /* for %m */
  42   void **x_data;
  43
  44   inline void set_location (unsigned int index_of_location, location_t loc)
  45   {
  46     gcc_checking_assert (index_of_location < MAX_LOCATIONS_PER_MESSAGE);
  47     this->locations[index_of_location] = loc;
  48   }
  49
  50   inline location_t get_location (unsigned int index_of_location) const
  51   {
  52     gcc_checking_assert (index_of_location < MAX_LOCATIONS_PER_MESSAGE);
  53     return this->locations[index_of_location];
  54   }
  55
  56 private:
  57   location_t locations[MAX_LOCATIONS_PER_MESSAGE];
  58 };
  59
  60 /* How often diagnostics are prefixed by their locations:
  61    o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  62    o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once;
  63    o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical
  64    line is started.  */
  65 enum diagnostic_prefixing_rule_t
  66 {
  67   DIAGNOSTICS_SHOW_PREFIX_ONCE       = 0x0,
  68   DIAGNOSTICS_SHOW_PREFIX_NEVER      = 0x1,
  69   DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2
  70 };
  71
  72 /* The chunk_info data structure forms a stack of the results from the
  73    first phase of formatting (pp_format) which have not yet been
  74    output (pp_output_formatted_text).  A stack is necessary because
  75    the diagnostic starter may decide to generate its own output by way
  76    of the formatter.  */
  77 struct chunk_info
  78 {
  79   /* Pointer to previous chunk on the stack.  */
  80   struct chunk_info *prev;
  81
  82   /* Array of chunks to output.  Each chunk is a NUL-terminated string.
  83      In the first phase of formatting, even-numbered chunks are
  84      to be output verbatim, odd-numbered chunks are format specifiers.
  85      The second phase replaces all odd-numbered chunks with formatted
  86      text, and the third phase simply emits all the chunks in sequence
  87      with appropriate line-wrapping.  */
  88   const char *args[PP_NL_ARGMAX * 2];
  89 };
  90
  91 /* The output buffer datatype.  This is best seen as an abstract datatype
  92    whose fields should not be accessed directly by clients.  */
  93 struct output_buffer
  94 {
  95   output_buffer ();
  96   ~output_buffer ();
  97
  98   /* Obstack where the text is built up.  */
  99   struct obstack formatted_obstack;
 100
 101   /* Obstack containing a chunked representation of the format
 102      specification plus arguments.  */
 103   struct obstack chunk_obstack;
 104
 105   /* Currently active obstack: one of the above two.  This is used so
 106      that the text formatters don't need to know which phase we're in.  */
 107   struct obstack *obstack;
 108
 109   /* Stack of chunk arrays.  These come from the chunk_obstack.  */
 110   struct chunk_info *cur_chunk_array;
 111
 112   /* Where to output formatted text.  */
 113   FILE *stream;
 114
 115   /* The amount of characters output so far.  */
 116   int line_length;
 117
 118   /* This must be large enough to hold any printed integer or
 119      floating-point value.  */
 120   char digit_buffer[128];
 121
 122   /* Nonzero means that text should be flushed when
 123      appropriate. Otherwise, text is buffered until either
 124      pp_really_flush or pp_clear_output_area are called.  */
 125   bool flush_p;
 126 };
 127
 128 /* Finishes constructing a NULL-terminated character string representing
 129    the buffered text.  */
 130 static inline const char *
 131 output_buffer_formatted_text (output_buffer *buff)
 132 {
 133   obstack_1grow (buff->obstack, '\0');
 134   return (const char *) obstack_base (buff->obstack);
 135 }
 136
 137 /* Append to the output buffer a string specified by its
 138    STARTing character and LENGTH.  */
 139 static inline void
 140 output_buffer_append_r (output_buffer *buff, const char *start, int length)
 141 {
 142   gcc_checking_assert (start);
 143   obstack_grow (buff->obstack, start, length);
 144   buff->line_length += length;
 145 }
 146
 147 /*  Return a pointer to the last character emitted in the
 148     output_buffer.  A NULL pointer means no character available.  */
 149 static inline const char *
 150 output_buffer_last_position_in_text (const output_buffer *buff)
 151 {
 152   const char *p = NULL;
 153   struct obstack *text = buff->obstack;
 154
 155   if (obstack_base (text) != obstack_next_free (text))
 156     p = ((const char *) obstack_next_free (text)) - 1;
 157   return p;
 158 }
 159
 160
 161 /* The type of pretty-printer flags passed to clients.  */
 162 typedef unsigned int pp_flags;
 163
 164 enum pp_padding
 165 {
 166   pp_none, pp_before, pp_after
 167 };
 168
 169 /* Structure for switching in and out of verbatim mode in a convenient
 170    manner.  */
 171 struct pp_wrapping_mode_t
 172 {
 173   /* Current prefixing rule.  */
 174   diagnostic_prefixing_rule_t rule;
 175
 176   /* The ideal upper bound of number of characters per line, as suggested
 177      by front-end.  */
 178   int line_cutoff;
 179 };
 180
 181 /* Maximum characters per line in automatic line wrapping mode.
 182    Zero means don't wrap lines.  */
 183 #define pp_line_cutoff(PP)  (PP)->wrapping.line_cutoff
 184
 185 /* Prefixing rule used in formatting a diagnostic message.  */
 186 #define pp_prefixing_rule(PP)  (PP)->wrapping.rule
 187
 188 /* Get or set the wrapping mode as a single entity.  */
 189 #define pp_wrapping_mode(PP) (PP)->wrapping
 190
 191 /* The type of a hook that formats client-specific data onto a pretty_printer.
 192    A client-supplied formatter returns true if everything goes well,
 193    otherwise it returns false.  */
 194 typedef bool (*printer_fn) (pretty_printer *, text_info *, const char *,
 195                             int, bool, bool, bool);
 196
 197 /* Client supplied function used to decode formats.  */
 198 #define pp_format_decoder(PP) (PP)->format_decoder
 199
 200 /* TRUE if a newline character needs to be added before further
 201    formatting.  */
 202 #define pp_needs_newline(PP)  (PP)->need_newline
 203
 204 /* True if PRETTY-PRINTER is in line-wrapping mode.  */
 205 #define pp_is_wrapping_line(PP) (pp_line_cutoff (PP) > 0)
 206
 207 /* The amount of whitespace to be emitted when starting a new line.  */
 208 #define pp_indentation(PP) (PP)->indent_skip
 209
 210 /* True if identifiers are translated to the locale character set on
 211    output.  */
 212 #define pp_translate_identifiers(PP) (PP)->translate_identifiers
 213
 214 /* True if colors should be shown.  */
 215 #define pp_show_color(PP) (PP)->show_color
 216
 217 /* The data structure that contains the bare minimum required to do
 218    proper pretty-printing.  Clients may derived from this structure
 219    and add additional fields they need.  */
 220 struct pretty_printer
 221 {
 222   // Default construct a pretty printer with specified prefix
 223   // and a maximum line length cut off limit.
 224   explicit pretty_printer (const char* = NULL, int = 0);
 225
 226   virtual ~pretty_printer ();
 227
 228   /* Where we print external representation of ENTITY.  */
 229   output_buffer *buffer;
 230
 231   /* The prefix for each new line.  */
 232   const char *prefix;
 233
 234   /* Where to put whitespace around the entity being formatted.  */
 235   pp_padding padding;
 236
 237   /* The real upper bound of number of characters per line, taking into
 238      account the case of a very very looong prefix.  */
 239   int maximum_length;
 240
 241   /* Indentation count.  */
 242   int indent_skip;
 243
 244   /* Current wrapping mode.  */
 245   pp_wrapping_mode_t wrapping;
 246
 247   /* If non-NULL, this function formats a TEXT into the BUFFER.  When called,
 248      TEXT->format_spec points to a format code.  FORMAT_DECODER should call
 249      pp_string (and related functions) to add data to the BUFFER.
 250      FORMAT_DECODER can read arguments from *TEXT->args_pts using VA_ARG.
 251      If the BUFFER needs additional characters from the format string, it
 252      should advance the TEXT->format_spec as it goes.  When FORMAT_DECODER
 253      returns, TEXT->format_spec should point to the last character processed.
 254   */
 255   printer_fn format_decoder;
 256
 257   /* Nonzero if current PREFIX was emitted at least once.  */
 258   bool emitted_prefix;
 259
 260   /* Nonzero means one should emit a newline before outputting anything.  */
 261   bool need_newline;
 262
 263   /* Nonzero means identifiers are translated to the locale character
 264      set on output.  */
 265   bool translate_identifiers;
 266
 267   /* Nonzero means that text should be colorized.  */
 268   bool show_color;
 269 };
 270
 271 static inline const char *
 272 pp_get_prefix (const pretty_printer *pp) { return pp->prefix; }
 273
 274 #define pp_space(PP)            pp_character (PP, ' ')
 275 #define pp_left_paren(PP)       pp_character (PP, '(')
 276 #define pp_right_paren(PP)      pp_character (PP, ')')
 277 #define pp_left_bracket(PP)     pp_character (PP, '[')
 278 #define pp_right_bracket(PP)    pp_character (PP, ']')
 279 #define pp_left_brace(PP)       pp_character (PP, '{')
 280 #define pp_right_brace(PP)      pp_character (PP, '}')
 281 #define pp_semicolon(PP)        pp_character (PP, ';')
 282 #define pp_comma(PP)            pp_character (PP, ',')
 283 #define pp_dot(PP)              pp_character (PP, '.')
 284 #define pp_colon(PP)            pp_character (PP, ':')
 285 #define pp_colon_colon(PP)      pp_string (PP, "::")
 286 #define pp_arrow(PP)            pp_string (PP, "->")
 287 #define pp_equal(PP)            pp_character (PP, '=')
 288 #define pp_question(PP)         pp_character (PP, '?')
 289 #define pp_bar(PP)              pp_character (PP, '|')
 290 #define pp_bar_bar(PP)          pp_string (PP, "||")
 291 #define pp_carret(PP)           pp_character (PP, '^')
 292 #define pp_ampersand(PP)        pp_character (PP, '&')
 293 #define pp_ampersand_ampersand(PP) pp_string (PP, "&&")
 294 #define pp_less(PP)             pp_character (PP, '<')
 295 #define pp_less_equal(PP)       pp_string (PP, "<=")
 296 #define pp_greater(PP)          pp_character (PP, '>')
 297 #define pp_greater_equal(PP)    pp_string (PP, ">=")
 298 #define pp_plus(PP)             pp_character (PP, '+')
 299 #define pp_minus(PP)            pp_character (PP, '-')
 300 #define pp_star(PP)             pp_character (PP, '*')
 301 #define pp_slash(PP)            pp_character (PP, '/')
 302 #define pp_modulo(PP)           pp_character (PP, '%')
 303 #define pp_exclamation(PP)      pp_character (PP, '!')
 304 #define pp_complement(PP)       pp_character (PP, '~')
 305 #define pp_quote(PP)            pp_character (PP, '\'')
 306 #define pp_backquote(PP)        pp_character (PP, '`')
 307 #define pp_doublequote(PP)      pp_character (PP, '"')
 308 #define pp_underscore(PP)       pp_character (PP, '_')
 309 #define pp_maybe_newline_and_indent(PP, N) \
 310   if (pp_needs_newline (PP)) pp_newline_and_indent (PP, N)
 311 #define pp_scalar(PP, FORMAT, SCALAR)                         \
 312   do                                                          \
 313     {                                                         \
 314       sprintf (pp_buffer (PP)->digit_buffer, FORMAT, SCALAR); \
 315       pp_string (PP, pp_buffer (PP)->digit_buffer);           \
 316     }                                                         \
 317   while (0)
 318 #define pp_decimal_int(PP, I)  pp_scalar (PP, "%d", I)
 319 #define pp_unsigned_wide_integer(PP, I) \
 320    pp_scalar (PP, HOST_WIDE_INT_PRINT_UNSIGNED, (unsigned HOST_WIDE_INT) I)
 321 #define pp_wide_int(PP, W, SGN)                                 \
 322   do                                                            \
 323     {                                                           \
 324       print_dec (W, pp_buffer (PP)->digit_buffer, SGN);         \
 325       pp_string (PP, pp_buffer (PP)->digit_buffer);             \
 326     }                                                           \
 327   while (0)
 328 #define pp_wide_integer(PP, I) \
 329    pp_scalar (PP, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT) I)
 330 #define pp_pointer(PP, P)      pp_scalar (PP, "%p", P)
 331
 332 #define pp_identifier(PP, ID)  pp_string (PP, (pp_translate_identifiers (PP) \
 333                                           ? identifier_to_locale (ID)   \
 334                                           : (ID)))
 335
 336
 337 #define pp_buffer(PP) (PP)->buffer
 338
 339 extern void pp_set_line_maximum_length (pretty_printer *, int);
 340 extern void pp_set_prefix (pretty_printer *, const char *);
 341 extern void pp_destroy_prefix (pretty_printer *);
 342 extern int pp_remaining_character_count_for_line (pretty_printer *);
 343 extern void pp_clear_output_area (pretty_printer *);
 344 extern const char *pp_formatted_text (pretty_printer *);
 345 extern const char *pp_last_position_in_text (const pretty_printer *);
 346 extern void pp_emit_prefix (pretty_printer *);
 347 extern void pp_append_text (pretty_printer *, const char *, const char *);
 348 extern void pp_newline_and_flush (pretty_printer *);
 349 extern void pp_newline_and_indent (pretty_printer *, int);
 350 extern void pp_separate_with (pretty_printer *, char);
 351
 352 /* If we haven't already defined a front-end-specific diagnostics
 353    style, use the generic one.  */
 354 #ifdef GCC_DIAG_STYLE
 355 #define GCC_PPDIAG_STYLE GCC_DIAG_STYLE
 356 #else
 357 #define GCC_PPDIAG_STYLE __gcc_diag__
 358 #endif
 359
 360 /* This header may be included before diagnostics-core.h, hence the duplicate
 361    definitions to allow for GCC-specific formats.  */
 362 #if GCC_VERSION >= 3005
 363 #define ATTRIBUTE_GCC_PPDIAG(m, n) __attribute__ ((__format__ (GCC_PPDIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 364 #else
 365 #define ATTRIBUTE_GCC_PPDIAG(m, n) ATTRIBUTE_NONNULL(m)
 366 #endif
 367 extern void pp_printf (pretty_printer *, const char *, ...)
 368      ATTRIBUTE_GCC_PPDIAG(2,3);
 369
 370 extern void pp_verbatim (pretty_printer *, const char *, ...)
 371      ATTRIBUTE_GCC_PPDIAG(2,3);
 372 extern void pp_flush (pretty_printer *);
 373 extern void pp_really_flush (pretty_printer *);
 374 extern void pp_format (pretty_printer *, text_info *);
 375 extern void pp_output_formatted_text (pretty_printer *);
 376 extern void pp_format_verbatim (pretty_printer *, text_info *);
 377
 378 extern void pp_indent (pretty_printer *);
 379 extern void pp_newline (pretty_printer *);
 380 extern void pp_character (pretty_printer *, int);
 381 extern void pp_string (pretty_printer *, const char *);
 382 extern void pp_write_text_to_stream (pretty_printer *);
 383 extern void pp_write_text_as_dot_label_to_stream (pretty_printer *, bool);
 384 extern void pp_maybe_space (pretty_printer *);
 385
 386 /* Switch into verbatim mode and return the old mode.  */
 387 static inline pp_wrapping_mode_t
 388 pp_set_verbatim_wrapping_ (pretty_printer *pp)
 389 {
 390   pp_wrapping_mode_t oldmode = pp_wrapping_mode (pp);
 391   pp_line_cutoff (pp) = 0;
 392   pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_NEVER;
 393   return oldmode;
 394 }
 395 #define pp_set_verbatim_wrapping(PP) pp_set_verbatim_wrapping_ (PP)
 396
 397 extern const char *identifier_to_locale (const char *);
 398 extern void *(*identifier_to_locale_alloc) (size_t);
 399 extern void (*identifier_to_locale_free) (void *);
 400
 401 #endif /* GCC_PRETTY_PRINT_H */