gcc/pretty-print.h

   1 /* Various declarations for language-independent pretty-print subroutines.
   2    Copyright (C) 2002-2020 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 "diagnostic-url.h"
  26
  27 /* Maximum number of format string arguments.  */
  28 #define PP_NL_ARGMAX   30
  29
  30 /* The type of a text to be formatted according a format specification
  31    along with a list of things.  */
  32 struct text_info
  33 {
  34   const char *format_spec;
  35   va_list *args_ptr;
  36   int err_no;  /* for %m */
  37   void **x_data;
  38   rich_location *m_richloc;
  39
  40   void set_location (unsigned int idx, location_t loc,
  41                      enum range_display_kind range_display_kind);
  42   location_t get_location (unsigned int index_of_location) const;
  43 };
  44
  45 /* How often diagnostics are prefixed by their locations:
  46    o DIAGNOSTICS_SHOW_PREFIX_NEVER: never - not yet supported;
  47    o DIAGNOSTICS_SHOW_PREFIX_ONCE: emit only once;
  48    o DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE: emit each time a physical
  49    line is started.  */
  50 enum diagnostic_prefixing_rule_t
  51 {
  52   DIAGNOSTICS_SHOW_PREFIX_ONCE       = 0x0,
  53   DIAGNOSTICS_SHOW_PREFIX_NEVER      = 0x1,
  54   DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE = 0x2
  55 };
  56
  57 /* The chunk_info data structure forms a stack of the results from the
  58    first phase of formatting (pp_format) which have not yet been
  59    output (pp_output_formatted_text).  A stack is necessary because
  60    the diagnostic starter may decide to generate its own output by way
  61    of the formatter.  */
  62 struct chunk_info
  63 {
  64   /* Pointer to previous chunk on the stack.  */
  65   struct chunk_info *prev;
  66
  67   /* Array of chunks to output.  Each chunk is a NUL-terminated string.
  68      In the first phase of formatting, even-numbered chunks are
  69      to be output verbatim, odd-numbered chunks are format specifiers.
  70      The second phase replaces all odd-numbered chunks with formatted
  71      text, and the third phase simply emits all the chunks in sequence
  72      with appropriate line-wrapping.  */
  73   const char *args[PP_NL_ARGMAX * 2];
  74 };
  75
  76 /* The output buffer datatype.  This is best seen as an abstract datatype
  77    whose fields should not be accessed directly by clients.  */
  78 class output_buffer
  79 {
  80 public:
  81   output_buffer ();
  82   ~output_buffer ();
  83
  84   /* Obstack where the text is built up.  */
  85   struct obstack formatted_obstack;
  86
  87   /* Obstack containing a chunked representation of the format
  88      specification plus arguments.  */
  89   struct obstack chunk_obstack;
  90
  91   /* Currently active obstack: one of the above two.  This is used so
  92      that the text formatters don't need to know which phase we're in.  */
  93   struct obstack *obstack;
  94
  95   /* Stack of chunk arrays.  These come from the chunk_obstack.  */
  96   struct chunk_info *cur_chunk_array;
  97
  98   /* Where to output formatted text.  */
  99   FILE *stream;
 100
 101   /* The amount of characters output so far.  */
 102   int line_length;
 103
 104   /* This must be large enough to hold any printed integer or
 105      floating-point value.  */
 106   char digit_buffer[128];
 107
 108   /* Nonzero means that text should be flushed when
 109      appropriate. Otherwise, text is buffered until either
 110      pp_really_flush or pp_clear_output_area are called.  */
 111   bool flush_p;
 112 };
 113
 114 /* Finishes constructing a NULL-terminated character string representing
 115    the buffered text.  */
 116 static inline const char *
 117 output_buffer_formatted_text (output_buffer *buff)
 118 {
 119   obstack_1grow (buff->obstack, '\0');
 120   return (const char *) obstack_base (buff->obstack);
 121 }
 122
 123 /* Append to the output buffer a string specified by its
 124    STARTing character and LENGTH.  */
 125 static inline void
 126 output_buffer_append_r (output_buffer *buff, const char *start, int length)
 127 {
 128   gcc_checking_assert (start);
 129   obstack_grow (buff->obstack, start, length);
 130   for (int i = 0; i < length; i++)
 131     if (start[i] == '\n')
 132       buff->line_length = 0;
 133     else
 134       buff->line_length++;
 135 }
 136
 137 /*  Return a pointer to the last character emitted in the
 138     output_buffer.  A NULL pointer means no character available.  */
 139 static inline const char *
 140 output_buffer_last_position_in_text (const output_buffer *buff)
 141 {
 142   const char *p = NULL;
 143   struct obstack *text = buff->obstack;
 144
 145   if (obstack_base (text) != obstack_next_free (text))
 146     p = ((const char *) obstack_next_free (text)) - 1;
 147   return p;
 148 }
 149
 150
 151 /* The type of pretty-printer flags passed to clients.  */
 152 typedef unsigned int pp_flags;
 153
 154 enum pp_padding
 155 {
 156   pp_none, pp_before, pp_after
 157 };
 158
 159 /* Structure for switching in and out of verbatim mode in a convenient
 160    manner.  */
 161 struct pp_wrapping_mode_t
 162 {
 163   /* Current prefixing rule.  */
 164   diagnostic_prefixing_rule_t rule;
 165
 166   /* The ideal upper bound of number of characters per line, as suggested
 167      by front-end.  */
 168   int line_cutoff;
 169 };
 170
 171 /* Maximum characters per line in automatic line wrapping mode.
 172    Zero means don't wrap lines.  */
 173 #define pp_line_cutoff(PP)  (PP)->wrapping.line_cutoff
 174
 175 /* Prefixing rule used in formatting a diagnostic message.  */
 176 #define pp_prefixing_rule(PP)  (PP)->wrapping.rule
 177
 178 /* Get or set the wrapping mode as a single entity.  */
 179 #define pp_wrapping_mode(PP) (PP)->wrapping
 180
 181 /* The type of a hook that formats client-specific data onto a pretty_printer.
 182    A client-supplied formatter returns true if everything goes well,
 183    otherwise it returns false.  */
 184 typedef bool (*printer_fn) (pretty_printer *, text_info *, const char *,
 185                             int, bool, bool, bool, bool *, const char **);
 186
 187 /* Client supplied function used to decode formats.  */
 188 #define pp_format_decoder(PP) (PP)->format_decoder
 189
 190 /* Base class for an optional client-supplied object for doing additional
 191    processing between stages 2 and 3 of formatted printing.  */
 192 class format_postprocessor
 193 {
 194  public:
 195   virtual ~format_postprocessor () {}
 196   virtual format_postprocessor *clone() const = 0;
 197   virtual void handle (pretty_printer *) = 0;
 198 };
 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 class pretty_printer
 221 {
 222 public:
 223   /* Default construct a pretty printer with specified
 224      maximum line length cut off limit.  */
 225   explicit pretty_printer (int = 0);
 226   explicit pretty_printer (const pretty_printer &other);
 227
 228   virtual ~pretty_printer ();
 229
 230   virtual pretty_printer *clone () const;
 231
 232   /* Where we print external representation of ENTITY.  */
 233   output_buffer *buffer;
 234
 235   /* The prefix for each new line.  If non-NULL, this is "owned" by the
 236      pretty_printer, and will eventually be free-ed.  */
 237   char *prefix;
 238
 239   /* Where to put whitespace around the entity being formatted.  */
 240   pp_padding padding;
 241
 242   /* The real upper bound of number of characters per line, taking into
 243      account the case of a very very looong prefix.  */
 244   int maximum_length;
 245
 246   /* Indentation count.  */
 247   int indent_skip;
 248
 249   /* Current wrapping mode.  */
 250   pp_wrapping_mode_t wrapping;
 251
 252   /* If non-NULL, this function formats a TEXT into the BUFFER.  When called,
 253      TEXT->format_spec points to a format code.  FORMAT_DECODER should call
 254      pp_string (and related functions) to add data to the BUFFER.
 255      FORMAT_DECODER can read arguments from *TEXT->args_pts using VA_ARG.
 256      If the BUFFER needs additional characters from the format string, it
 257      should advance the TEXT->format_spec as it goes.  When FORMAT_DECODER
 258      returns, TEXT->format_spec should point to the last character processed.
 259      The QUOTE and BUFFER_PTR are passed in, to allow for deferring-handling
 260      of format codes (e.g. %H and %I in the C++ frontend).  */
 261   printer_fn format_decoder;
 262
 263   /* If non-NULL, this is called by pp_format once after all format codes
 264      have been processed, to allow for client-specific postprocessing.
 265      This is used by the C++ frontend for handling the %H and %I
 266      format codes (which interract with each other).  */
 267   format_postprocessor *m_format_postprocessor;
 268
 269   /* Nonzero if current PREFIX was emitted at least once.  */
 270   bool emitted_prefix;
 271
 272   /* Nonzero means one should emit a newline before outputting anything.  */
 273   bool need_newline;
 274
 275   /* Nonzero means identifiers are translated to the locale character
 276      set on output.  */
 277   bool translate_identifiers;
 278
 279   /* Nonzero means that text should be colorized.  */
 280   bool show_color;
 281
 282   /* Whether URLs should be emitted, and which terminator to use.  */
 283   diagnostic_url_format url_format;
 284 };
 285
 286 static inline const char *
 287 pp_get_prefix (const pretty_printer *pp) { return pp->prefix; }
 288
 289 #define pp_space(PP)            pp_character (PP, ' ')
 290 #define pp_left_paren(PP)       pp_character (PP, '(')
 291 #define pp_right_paren(PP)      pp_character (PP, ')')
 292 #define pp_left_bracket(PP)     pp_character (PP, '[')
 293 #define pp_right_bracket(PP)    pp_character (PP, ']')
 294 #define pp_left_brace(PP)       pp_character (PP, '{')
 295 #define pp_right_brace(PP)      pp_character (PP, '}')
 296 #define pp_semicolon(PP)        pp_character (PP, ';')
 297 #define pp_comma(PP)            pp_character (PP, ',')
 298 #define pp_dot(PP)              pp_character (PP, '.')
 299 #define pp_colon(PP)            pp_character (PP, ':')
 300 #define pp_colon_colon(PP)      pp_string (PP, "::")
 301 #define pp_arrow(PP)            pp_string (PP, "->")
 302 #define pp_equal(PP)            pp_character (PP, '=')
 303 #define pp_question(PP)         pp_character (PP, '?')
 304 #define pp_bar(PP)              pp_character (PP, '|')
 305 #define pp_bar_bar(PP)          pp_string (PP, "||")
 306 #define pp_carret(PP)           pp_character (PP, '^')
 307 #define pp_ampersand(PP)        pp_character (PP, '&')
 308 #define pp_ampersand_ampersand(PP) pp_string (PP, "&&")
 309 #define pp_less(PP)             pp_character (PP, '<')
 310 #define pp_less_equal(PP)       pp_string (PP, "<=")
 311 #define pp_greater(PP)          pp_character (PP, '>')
 312 #define pp_greater_equal(PP)    pp_string (PP, ">=")
 313 #define pp_plus(PP)             pp_character (PP, '+')
 314 #define pp_minus(PP)            pp_character (PP, '-')
 315 #define pp_star(PP)             pp_character (PP, '*')
 316 #define pp_slash(PP)            pp_character (PP, '/')
 317 #define pp_modulo(PP)           pp_character (PP, '%')
 318 #define pp_exclamation(PP)      pp_character (PP, '!')
 319 #define pp_complement(PP)       pp_character (PP, '~')
 320 #define pp_quote(PP)            pp_character (PP, '\'')
 321 #define pp_backquote(PP)        pp_character (PP, '`')
 322 #define pp_doublequote(PP)      pp_character (PP, '"')
 323 #define pp_underscore(PP)       pp_character (PP, '_')
 324 #define pp_maybe_newline_and_indent(PP, N) \
 325   if (pp_needs_newline (PP)) pp_newline_and_indent (PP, N)
 326 #define pp_scalar(PP, FORMAT, SCALAR)                         \
 327   do                                                          \
 328     {                                                         \
 329       sprintf (pp_buffer (PP)->digit_buffer, FORMAT, SCALAR); \
 330       pp_string (PP, pp_buffer (PP)->digit_buffer);           \
 331     }                                                         \
 332   while (0)
 333 #define pp_decimal_int(PP, I)  pp_scalar (PP, "%d", I)
 334 #define pp_unsigned_wide_integer(PP, I) \
 335    pp_scalar (PP, HOST_WIDE_INT_PRINT_UNSIGNED, (unsigned HOST_WIDE_INT) I)
 336 #define pp_wide_int(PP, W, SGN)                                 \
 337   do                                                            \
 338     {                                                           \
 339       print_dec (W, pp_buffer (PP)->digit_buffer, SGN);         \
 340       pp_string (PP, pp_buffer (PP)->digit_buffer);             \
 341     }                                                           \
 342   while (0)
 343 #define pp_double(PP, F)       pp_scalar (PP, "%f", F)
 344 #define pp_pointer(PP, P)      pp_scalar (PP, "%p", P)
 345
 346 #define pp_identifier(PP, ID)  pp_string (PP, (pp_translate_identifiers (PP) \
 347                                           ? identifier_to_locale (ID)   \
 348                                           : (ID)))
 349
 350
 351 #define pp_buffer(PP) (PP)->buffer
 352
 353 extern void pp_set_line_maximum_length (pretty_printer *, int);
 354 extern void pp_set_prefix (pretty_printer *, char *);
 355 extern char *pp_take_prefix (pretty_printer *);
 356 extern void pp_destroy_prefix (pretty_printer *);
 357 extern int pp_remaining_character_count_for_line (pretty_printer *);
 358 extern void pp_clear_output_area (pretty_printer *);
 359 extern const char *pp_formatted_text (pretty_printer *);
 360 extern const char *pp_last_position_in_text (const pretty_printer *);
 361 extern void pp_emit_prefix (pretty_printer *);
 362 extern void pp_append_text (pretty_printer *, const char *, const char *);
 363 extern void pp_newline_and_flush (pretty_printer *);
 364 extern void pp_newline_and_indent (pretty_printer *, int);
 365 extern void pp_separate_with (pretty_printer *, char);
 366
 367 /* If we haven't already defined a front-end-specific diagnostics
 368    style, use the generic one.  */
 369 #ifdef GCC_DIAG_STYLE
 370 #define GCC_PPDIAG_STYLE GCC_DIAG_STYLE
 371 #else
 372 #define GCC_PPDIAG_STYLE __gcc_diag__
 373 #endif
 374
 375 /* This header may be included before diagnostics-core.h, hence the duplicate
 376    definitions to allow for GCC-specific formats.  */
 377 #if GCC_VERSION >= 3005
 378 #define ATTRIBUTE_GCC_PPDIAG(m, n) __attribute__ ((__format__ (GCC_PPDIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 379 #else
 380 #define ATTRIBUTE_GCC_PPDIAG(m, n) ATTRIBUTE_NONNULL(m)
 381 #endif
 382 extern void pp_printf (pretty_printer *, const char *, ...)
 383      ATTRIBUTE_GCC_PPDIAG(2,3);
 384
 385 extern void pp_verbatim (pretty_printer *, const char *, ...)
 386      ATTRIBUTE_GCC_PPDIAG(2,3);
 387 extern void pp_flush (pretty_printer *);
 388 extern void pp_really_flush (pretty_printer *);
 389 extern void pp_format (pretty_printer *, text_info *);
 390 extern void pp_output_formatted_text (pretty_printer *);
 391 extern void pp_format_verbatim (pretty_printer *, text_info *);
 392
 393 extern void pp_indent (pretty_printer *);
 394 extern void pp_newline (pretty_printer *);
 395 extern void pp_character (pretty_printer *, int);
 396 extern void pp_string (pretty_printer *, const char *);
 397
 398 extern void pp_write_text_to_stream (pretty_printer *);
 399 extern void pp_write_text_as_dot_label_to_stream (pretty_printer *, bool);
 400 extern void pp_write_text_as_html_like_dot_to_stream (pretty_printer *pp);
 401
 402 extern void pp_maybe_space (pretty_printer *);
 403
 404 extern void pp_begin_quote (pretty_printer *, bool);
 405 extern void pp_end_quote (pretty_printer *, bool);
 406
 407 extern void pp_begin_url (pretty_printer *pp, const char *url);
 408 extern void pp_end_url (pretty_printer *pp);
 409
 410 /* Switch into verbatim mode and return the old mode.  */
 411 static inline pp_wrapping_mode_t
 412 pp_set_verbatim_wrapping_ (pretty_printer *pp)
 413 {
 414   pp_wrapping_mode_t oldmode = pp_wrapping_mode (pp);
 415   pp_line_cutoff (pp) = 0;
 416   pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_NEVER;
 417   return oldmode;
 418 }
 419 #define pp_set_verbatim_wrapping(PP) pp_set_verbatim_wrapping_ (PP)
 420
 421 extern const char *identifier_to_locale (const char *);
 422 extern void *(*identifier_to_locale_alloc) (size_t);
 423 extern void (*identifier_to_locale_free) (void *);
 424
 425 /* Print I to PP in decimal.  */
 426
 427 inline void
 428 pp_wide_integer (pretty_printer *pp, HOST_WIDE_INT i)
 429 {
 430   pp_scalar (pp, HOST_WIDE_INT_PRINT_DEC, i);
 431 }
 432
 433 template<unsigned int N, typename T>
 434 void pp_wide_integer (pretty_printer *pp, const poly_int_pod<N, T> &);
 435
 436 #endif /* GCC_PRETTY_PRINT_H */