gcc/pretty-print.c

   1 /* Various declarations for language-independent pretty-print subroutines.
   2    Copyright (C) 2003, 2004 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 #include "config.h"
  23 #undef FLOAT /* This is for hpux. They should change hpux.  */
  24 #undef FFS  /* Some systems define this in param.h.  */
  25 #include "system.h"
  26 #include "coretypes.h"
  27 #include "pretty-print.h"
  28
  29 #define obstack_chunk_alloc xmalloc
  30 #define obstack_chunk_free  free
  31
  32 /* A pointer to the formatted diagnostic message.  */
  33 #define pp_formatted_text_data(PP) \
  34    ((const char *) obstack_base (&pp_base (PP)->buffer->obstack))
  35
  36 /* Format an integer given by va_arg (ARG, type-specifier T) where
  37    type-specifier is a precision modifier as indicated by PREC.  F is
  38    a string used to construct the appropriate format-specifier.  */
  39 #define pp_integer_with_precision(PP, ARG, PREC, T, F)       \
  40   do                                                         \
  41     switch (PREC)                                            \
  42       {                                                      \
  43       case 0:                                                \
  44         pp_scalar (PP, "%" F, va_arg (ARG, T));              \
  45         break;                                               \
  46                                                              \
  47       case 1:                                                \
  48         pp_scalar (PP, "%l" F, va_arg (ARG, long T));        \
  49         break;                                               \
  50                                                              \
  51       case 2:                                                \
  52         pp_scalar (PP, "%ll" F, va_arg (ARG, long long T));  \
  53         break;                                               \
  54                                                              \
  55       default:                                               \
  56         break;                                               \
  57       }                                                      \
  58   while (0)
  59
  60
  61 /* Subroutine of pp_set_maximum_length.  Set up PRETTY-PRINTER's
  62    internal maximum characters per line.  */
  63 static void
  64 pp_set_real_maximum_length (pretty_printer *pp)
  65 {
  66   /* If we're told not to wrap lines then do the obvious thing.  In case
  67      we'll emit prefix only once per message, it is appropriate
  68      not to increase unnecessarily the line-length cut-off.  */
  69   if (!pp_is_wrapping_line (pp)
  70       || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_ONCE
  71       || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_NEVER)
  72     pp->maximum_length = pp_line_cutoff (pp);
  73   else
  74     {
  75       int prefix_length = pp->prefix ? strlen (pp->prefix) : 0;
  76       /* If the prefix is ridiculously too long, output at least
  77          32 characters.  */
  78       if (pp_line_cutoff (pp) - prefix_length < 32)
  79         pp->maximum_length = pp_line_cutoff (pp) + 32;
  80       else
  81         pp->maximum_length = pp_line_cutoff (pp);
  82     }
  83 }
  84
  85 /* Clear PRETTY-PRINTER's output state.  */
  86 static inline void
  87 pp_clear_state (pretty_printer *pp)
  88 {
  89   pp->emitted_prefix = false;
  90   pp_indentation (pp) = 0;
  91 }
  92
  93 /* Flush the formatted text of PRETTY-PRINTER onto the attached stream.  */
  94 static inline void
  95 pp_write_text_to_stream (pretty_printer *pp)
  96 {
  97   const char *text = pp_formatted_text (pp);
  98   fputs (text, pp->buffer->stream);
  99   pp_clear_output_area (pp);
 100 }
 101
 102 /* Wrap a text delimited by START and END into PRETTY-PRINTER.  */
 103 static void
 104 pp_wrap_text (pretty_printer *pp, const char *start, const char *end)
 105 {
 106   bool wrapping_line = pp_is_wrapping_line (pp);
 107
 108   while (start != end)
 109     {
 110       /* Dump anything bordered by whitespaces.  */
 111       {
 112         const char *p = start;
 113         while (p != end && !ISBLANK (*p) && *p != '\n')
 114           ++p;
 115         if (wrapping_line
 116             && p - start >= pp_remaining_character_count_for_line (pp))
 117           pp_newline (pp);
 118         pp_append_text (pp, start, p);
 119         start = p;
 120       }
 121
 122       if (start != end && ISBLANK (*start))
 123         {
 124           pp_space (pp);
 125           ++start;
 126         }
 127       if (start != end && *start == '\n')
 128         {
 129           pp_newline (pp);
 130           ++start;
 131         }
 132     }
 133 }
 134
 135 /* Same as pp_wrap_text but wrap text only when in line-wrapping mode.  */
 136 static inline void
 137 pp_maybe_wrap_text (pretty_printer *pp, const char *start, const char *end)
 138 {
 139   if (pp_is_wrapping_line (pp))
 140     pp_wrap_text (pp, start, end);
 141   else
 142     pp_append_text (pp, start, end);
 143 }
 144
 145 /* Append to the output area of PRETTY-PRINTER a string specified by its
 146    STARTing character and LENGTH.  */
 147 static inline void
 148 pp_append_r (pretty_printer *pp, const char *start, int length)
 149 {
 150   obstack_grow (&pp->buffer->obstack, start, length);
 151   pp->buffer->line_length += length;
 152 }
 153
 154 /* Insert enough spaces into the output area of PRETTY-PRINTER to bring
 155    the column position to the current indentation level, assuming that a
 156    newline has just been written to the buffer.  */
 157 void
 158 pp_base_indent (pretty_printer *pp)
 159 {
 160   int n = pp_indentation (pp);
 161   int i;
 162
 163   for (i = 0; i < n; ++i)
 164     pp_space (pp);
 165 }
 166
 167 /* Format a message pointed to by TEXT.  The following format specifiers are
 168    recognized as being client independent:
 169    %d, %i: (signed) integer in base ten.
 170    %u: unsigned integer in base ten.
 171    %o: unsigned integer in base eight.
 172    %x: unsigned integer in base sixteen.
 173    %ld, %li, %lo, %lu, %lx: long versions of the above.
 174    %lld, %lli, %llo, %llu, %llx: long long versions.
 175    %wd, %wi, %wo, %wu, %wx: HOST_WIDE_INT versions.
 176    %c: character.
 177    %s: string.
 178    %p: pointer.
 179    %m: strerror(text->err_no) - does not consume a value from args_ptr.
 180    %%: `%'.
 181    %.*s: a substring the length of which is specified by an integer.
 182    %H: location_t.  */
 183 void
 184 pp_base_format_text (pretty_printer *pp, text_info *text)
 185 {
 186   for (; *text->format_spec; ++text->format_spec)
 187     {
 188       int precision = 0;
 189       bool wide = false;
 190
 191       /* Ignore text.  */
 192       {
 193         const char *p = text->format_spec;
 194         while (*p && *p != '%')
 195           ++p;
 196         pp_wrap_text (pp, text->format_spec, p);
 197         text->format_spec = p;
 198       }
 199
 200       if (*text->format_spec == '\0')
 201         break;
 202
 203       /* We got a '%'.  Parse precision modifiers, if any.  */
 204       switch (*++text->format_spec)
 205         {
 206         case 'w':
 207           wide = true;
 208           ++text->format_spec;
 209           break;
 210
 211         case 'l':
 212           do
 213             ++precision;
 214           while (*++text->format_spec == 'l');
 215           break;
 216
 217         default:
 218           break;
 219         }
 220       /* We don't support precision beyond that of "long long".  */
 221       if (precision > 2)
 222         abort();
 223
 224       switch (*text->format_spec)
 225         {
 226         case 'c':
 227           pp_character (pp, va_arg (*text->args_ptr, int));
 228           break;
 229
 230         case 'd':
 231         case 'i':
 232           if (wide)
 233             pp_wide_integer (pp, va_arg (*text->args_ptr, HOST_WIDE_INT));
 234           else
 235             pp_integer_with_precision
 236               (pp, *text->args_ptr, precision, int, "d");
 237           break;
 238
 239         case 'o':
 240           if (wide)
 241             pp_scalar (pp, "%" HOST_WIDE_INT_PRINT "o",
 242                        va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
 243           else
 244             pp_integer_with_precision
 245               (pp, *text->args_ptr, precision, unsigned, "u");
 246           break;
 247
 248         case 's':
 249           pp_string (pp, va_arg (*text->args_ptr, const char *));
 250           break;
 251
 252         case 'p':
 253           pp_pointer (pp, va_arg (*text->args_ptr, void *));
 254           break;
 255
 256         case 'u':
 257           if (wide)
 258             pp_scalar (pp, HOST_WIDE_INT_PRINT_UNSIGNED,
 259                        va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
 260           else
 261             pp_integer_with_precision
 262               (pp, *text->args_ptr, precision, unsigned, "u");
 263           break;
 264
 265         case 'x':
 266           if (wide)
 267             pp_scalar (pp, HOST_WIDE_INT_PRINT_HEX,
 268                        va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
 269           else
 270             pp_integer_with_precision
 271               (pp, *text->args_ptr, precision, unsigned, "x");
 272           break;
 273
 274         case 'm':
 275           pp_string (pp, xstrerror (text->err_no));
 276           break;
 277
 278         case '%':
 279           pp_character (pp, '%');
 280           break;
 281
 282         case 'H':
 283           {
 284             const location_t *locus = va_arg (*text->args_ptr, location_t *);
 285             pp_string (pp, "file '");
 286             pp_string (pp, locus->file);
 287             pp_string (pp, "', line ");
 288             pp_decimal_int (pp, locus->line);
 289           }
 290           break;
 291
 292         case '.':
 293           {
 294             int n;
 295             const char *s;
 296             /* We handle no precision specifier but `%.*s'.  */
 297             if (*++text->format_spec != '*')
 298               abort ();
 299             else if (*++text->format_spec != 's')
 300               abort ();
 301             n = va_arg (*text->args_ptr, int);
 302             s = va_arg (*text->args_ptr, const char *);
 303             pp_append_text (pp, s, s + n);
 304           }
 305           break;
 306
 307         default:
 308           if (!pp_format_decoder (pp) || !(*pp_format_decoder (pp)) (pp, text))
 309             {
 310               /* Hmmm.  The client failed to install a format translator
 311                  but called us with an unrecognized format.  Or, maybe, the
 312                  translated string just contains an invalid format, or
 313                  has formats in the wrong order.  Sorry.  */
 314               abort ();
 315             }
 316         }
 317     }
 318 }
 319
 320 /* Helper subroutine of output_verbatim and verbatim. Do the appropriate
 321    settings needed by BUFFER for a verbatim formatting.  */
 322 void
 323 pp_base_format_verbatim (pretty_printer *pp, text_info *text)
 324 {
 325   diagnostic_prefixing_rule_t rule = pp_prefixing_rule (pp);
 326   int line_cutoff = pp_line_cutoff (pp);
 327
 328   /* Set verbatim mode.  */
 329   pp->prefixing_rule = DIAGNOSTICS_SHOW_PREFIX_NEVER;
 330   pp_line_cutoff (pp) = 0;
 331   /* Do the actual formatting.  */
 332   pp_format_text (pp, text);
 333   /* Restore previous settings.  */
 334   pp_prefixing_rule (pp) = rule;
 335   pp_line_cutoff (pp) = line_cutoff;
 336 }
 337
 338 /* Flush the content of BUFFER onto the attached stream.  */
 339 void
 340 pp_base_flush (pretty_printer *pp)
 341 {
 342   pp_write_text_to_stream (pp);
 343   pp_clear_state (pp);
 344   fputc ('\n', pp->buffer->stream);
 345   fflush (pp->buffer->stream);
 346   pp_needs_newline (pp) = false;
 347 }
 348
 349 /* Sets the number of maximum characters per line PRETTY-PRINTER can
 350    output in line-wrapping mode.  A LENGTH value 0 suppresses
 351    line-wrapping.  */
 352 void
 353 pp_base_set_line_maximum_length (pretty_printer *pp, int length)
 354 {
 355   pp_line_cutoff (pp) = length;
 356   pp_set_real_maximum_length (pp);
 357 }
 358
 359 /* Clear PRETTY-PRINTER output area text info.  */
 360 void
 361 pp_base_clear_output_area (pretty_printer *pp)
 362 {
 363   obstack_free (&pp->buffer->obstack, obstack_base (&pp->buffer->obstack));
 364   pp->buffer->line_length = 0;
 365 }
 366
 367 /* Set PREFIX for PRETTY-PRINTER.  */
 368 void
 369 pp_base_set_prefix (pretty_printer *pp, const char *prefix)
 370 {
 371   pp->prefix = prefix;
 372   pp_set_real_maximum_length (pp);
 373   pp->emitted_prefix = false;
 374   pp_indentation (pp) = 0;
 375 }
 376
 377 /* Free PRETTY-PRINTER's prefix, a previously malloc()'d string.  */
 378 void
 379 pp_base_destroy_prefix (pretty_printer *pp)
 380 {
 381   if (pp->prefix != NULL)
 382     {
 383       free ((char *) pp->prefix);
 384       pp->prefix = NULL;
 385     }
 386 }
 387
 388 /* Write out PRETTY-PRINTER's prefix.  */
 389 void
 390 pp_base_emit_prefix (pretty_printer *pp)
 391 {
 392   if (pp->prefix != NULL)
 393     {
 394       switch (pp_prefixing_rule (pp))
 395         {
 396         default:
 397         case DIAGNOSTICS_SHOW_PREFIX_NEVER:
 398           break;
 399
 400         case DIAGNOSTICS_SHOW_PREFIX_ONCE:
 401           if (pp->emitted_prefix)
 402             {
 403               pp_base_indent (pp);
 404               break;
 405             }
 406           pp_indentation (pp) += 3;
 407           /* Fall through.  */
 408
 409         case DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE:
 410           {
 411             int prefix_length = strlen (pp->prefix);
 412             pp_append_r (pp, pp->prefix, prefix_length);
 413             pp->emitted_prefix = true;
 414           }
 415           break;
 416         }
 417     }
 418 }
 419
 420 /* Construct a PRETTY-PRINTER with PREFIX and of MAXIMUM_LENGTH
 421    characters per line.  */
 422 void
 423 pp_construct (pretty_printer *pp, const char *prefix, int maximum_length)
 424 {
 425   memset (pp, 0, sizeof (pretty_printer));
 426   pp->buffer = xcalloc (1, sizeof (output_buffer));
 427   obstack_init (&pp->buffer->obstack);
 428   pp->buffer->stream = stderr;
 429   pp_line_cutoff (pp) = maximum_length;
 430   pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
 431   pp_set_prefix (pp, prefix);
 432 }
 433
 434 /* Append a string delimited by START and END to the output area of
 435    PRETTY-PRINTER.  No line wrapping is done.  However, if beginning a
 436    new line then emit PRETTY-PRINTER's prefix and skip any leading
 437    whitespace if appropriate.  The caller must ensure that it is
 438    safe to do so.  */
 439 void
 440 pp_base_append_text (pretty_printer *pp, const char *start, const char *end)
 441 {
 442   /* Emit prefix and skip whitespace if we're starting a new line.  */
 443   if (pp->buffer->line_length == 0)
 444     {
 445       pp_emit_prefix (pp);
 446       if (pp_is_wrapping_line (pp))
 447         while (start != end && *start == ' ')
 448           ++start;
 449     }
 450   pp_append_r (pp, start, end - start);
 451 }
 452
 453 /* Finishes constructing a NULL-terminated character string representing
 454    the PRETTY-PRINTED text.  */
 455 const char *
 456 pp_base_formatted_text (pretty_printer *pp)
 457 {
 458   obstack_1grow (&pp->buffer->obstack, '\0');
 459   return pp_formatted_text_data (pp);
 460 }
 461
 462 /*  Return a pointer to the last character emitted in PRETTY-PRINTER's
 463     output area.  A NULL pointer means no character available.  */
 464 const char *
 465 pp_base_last_position_in_text (const pretty_printer *pp)
 466 {
 467   const char *p = NULL;
 468   struct obstack *text = &pp->buffer->obstack;
 469
 470   if (obstack_base (text) != obstack_next_free (text))
 471     p = ((const char *) obstack_next_free (text)) - 1;
 472   return p;
 473 }
 474
 475 /* Return the amount of characters PRETTY-PRINTER can accept to
 476    make a full line.  Meaningful only in line-wrapping mode.  */
 477 int
 478 pp_base_remaining_character_count_for_line (pretty_printer *pp)
 479 {
 480   return pp->maximum_length - pp->buffer->line_length;
 481 }
 482
 483
 484 /* Format a message into BUFFER a la printf.  */
 485 void
 486 pp_printf (pretty_printer *pp, const char *msg, ...)
 487 {
 488   text_info text;
 489   va_list ap;
 490
 491   va_start (ap, msg);
 492   text.err_no = errno;
 493   text.args_ptr = &ap;
 494   text.format_spec = msg;
 495   pp_format_text (pp, &text);
 496   va_end (ap);
 497 }
 498
 499
 500 /* Output MESSAGE verbatim into BUFFER.  */
 501 void
 502 pp_verbatim (pretty_printer *pp, const char *msg, ...)
 503 {
 504   text_info text;
 505   va_list ap;
 506
 507   va_start (ap, msg);
 508   text.err_no = errno;
 509   text.args_ptr = &ap;
 510   text.format_spec = msg;
 511   pp_format_verbatim (pp, &text);
 512   va_end (ap);
 513 }
 514
 515
 516
 517 /* Have PRETTY-PRINTER start a new line.  */
 518 void
 519 pp_base_newline (pretty_printer *pp)
 520 {
 521   obstack_1grow (&pp->buffer->obstack, '\n');
 522   pp->buffer->line_length = 0;
 523 }
 524
 525 /* Have PRETTY-PRINTER add a CHARACTER.  */
 526 void
 527 pp_base_character (pretty_printer *pp, int c)
 528 {
 529   if (pp_is_wrapping_line (pp)
 530       && pp_remaining_character_count_for_line (pp) <= 0)
 531     {
 532       pp_newline (pp);
 533       if (ISSPACE (c))
 534         return;
 535     }
 536   obstack_1grow (&pp->buffer->obstack, c);
 537   ++pp->buffer->line_length;
 538 }
 539
 540 /* Append a STRING to the output area of PRETTY-PRINTER; the STRING may
 541    be line-wrapped if in appropriate mode.  */
 542 void
 543 pp_base_string (pretty_printer *pp, const char *str)
 544 {
 545   pp_maybe_wrap_text (pp, str, str + (str ? strlen (str) : 0));
 546 }
 547
 548 /* Maybe print out a whitespace if needed.   */
 549
 550 void
 551 pp_base_maybe_space (pretty_printer *pp)
 552 {
 553   if (pp_base (pp)->padding != pp_none)
 554     {
 555       pp_space (pp);
 556       pp_base (pp)->padding = pp_none;
 557     }
 558 }