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[official-gcc.git] / gcc / pretty-print.c
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1 /* Various declarations for language-independent pretty-print subroutines.
2 Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
3 Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
5 This file is part of GCC.
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.
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.
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, 51 Franklin Street, Fifth Floor, Boston, MA
20 02110-1301, USA. */
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 "intl.h"
28 #include "pretty-print.h"
29 #include "tree.h"
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
34 /* A pointer to the formatted diagnostic message. */
35 #define pp_formatted_text_data(PP) \
36 ((const char *) obstack_base (pp_base (PP)->buffer->obstack))
38 /* Format an integer given by va_arg (ARG, type-specifier T) where
39 type-specifier is a precision modifier as indicated by PREC. F is
40 a string used to construct the appropriate format-specifier. */
41 #define pp_integer_with_precision(PP, ARG, PREC, T, F) \
42 do \
43 switch (PREC) \
44 { \
45 case 0: \
46 pp_scalar (PP, "%" F, va_arg (ARG, T)); \
47 break; \
49 case 1: \
50 pp_scalar (PP, "%l" F, va_arg (ARG, long T)); \
51 break; \
53 case 2: \
54 pp_scalar (PP, "%ll" F, va_arg (ARG, long long T)); \
55 break; \
57 default: \
58 break; \
59 } \
60 while (0)
63 /* Subroutine of pp_set_maximum_length. Set up PRETTY-PRINTER's
64 internal maximum characters per line. */
65 static void
66 pp_set_real_maximum_length (pretty_printer *pp)
68 /* If we're told not to wrap lines then do the obvious thing. In case
69 we'll emit prefix only once per message, it is appropriate
70 not to increase unnecessarily the line-length cut-off. */
71 if (!pp_is_wrapping_line (pp)
72 || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_ONCE
73 || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_NEVER)
74 pp->maximum_length = pp_line_cutoff (pp);
75 else
77 int prefix_length = pp->prefix ? strlen (pp->prefix) : 0;
78 /* If the prefix is ridiculously too long, output at least
79 32 characters. */
80 if (pp_line_cutoff (pp) - prefix_length < 32)
81 pp->maximum_length = pp_line_cutoff (pp) + 32;
82 else
83 pp->maximum_length = pp_line_cutoff (pp);
87 /* Clear PRETTY-PRINTER's output state. */
88 static inline void
89 pp_clear_state (pretty_printer *pp)
91 pp->emitted_prefix = false;
92 pp_indentation (pp) = 0;
95 /* Flush the formatted text of PRETTY-PRINTER onto the attached stream. */
96 void
97 pp_write_text_to_stream (pretty_printer *pp)
99 const char *text = pp_formatted_text (pp);
100 fputs (text, pp->buffer->stream);
101 pp_clear_output_area (pp);
104 /* Wrap a text delimited by START and END into PRETTY-PRINTER. */
105 static void
106 pp_wrap_text (pretty_printer *pp, const char *start, const char *end)
108 bool wrapping_line = pp_is_wrapping_line (pp);
110 while (start != end)
112 /* Dump anything bordered by whitespaces. */
114 const char *p = start;
115 while (p != end && !ISBLANK (*p) && *p != '\n')
116 ++p;
117 if (wrapping_line
118 && p - start >= pp_remaining_character_count_for_line (pp))
119 pp_newline (pp);
120 pp_append_text (pp, start, p);
121 start = p;
124 if (start != end && ISBLANK (*start))
126 pp_space (pp);
127 ++start;
129 if (start != end && *start == '\n')
131 pp_newline (pp);
132 ++start;
137 /* Same as pp_wrap_text but wrap text only when in line-wrapping mode. */
138 static inline void
139 pp_maybe_wrap_text (pretty_printer *pp, const char *start, const char *end)
141 if (pp_is_wrapping_line (pp))
142 pp_wrap_text (pp, start, end);
143 else
144 pp_append_text (pp, start, end);
147 /* Append to the output area of PRETTY-PRINTER a string specified by its
148 STARTing character and LENGTH. */
149 static inline void
150 pp_append_r (pretty_printer *pp, const char *start, int length)
152 obstack_grow (pp->buffer->obstack, start, length);
153 pp->buffer->line_length += length;
156 /* Insert enough spaces into the output area of PRETTY-PRINTER to bring
157 the column position to the current indentation level, assuming that a
158 newline has just been written to the buffer. */
159 void
160 pp_base_indent (pretty_printer *pp)
162 int n = pp_indentation (pp);
163 int i;
165 for (i = 0; i < n; ++i)
166 pp_space (pp);
169 /* The following format specifiers are recognized as being client independent:
170 %d, %i: (signed) integer in base ten.
171 %u: unsigned integer in base ten.
172 %o: unsigned integer in base eight.
173 %x: unsigned integer in base sixteen.
174 %ld, %li, %lo, %lu, %lx: long versions of the above.
175 %lld, %lli, %llo, %llu, %llx: long long versions.
176 %wd, %wi, %wo, %wu, %wx: HOST_WIDE_INT versions.
177 %c: character.
178 %s: string.
179 %p: pointer.
180 %m: strerror(text->err_no) - does not consume a value from args_ptr.
181 %%: '%'.
182 %<: opening quote.
183 %>: closing quote.
184 %': apostrophe (should only be used in untranslated messages;
185 translations should use appropriate punctuation directly).
186 %.*s: a substring the length of which is specified by an argument
187 integer.
188 %Ns: likewise, but length specified as constant in the format string.
189 %H: location_t.
190 %J: a decl tree, from which DECL_SOURCE_LOCATION will be recorded.
191 Flag 'q': quote formatted text (must come immediately after '%').
193 Arguments can be used sequentially, or through %N$ resp. *N$
194 notation Nth argument after the format string. If %N$ / *N$
195 notation is used, it must be used for all arguments, except %m, %%,
196 %<, %> and %', which may not have a number, as they do not consume
197 an argument. When %M$.*N$s is used, M must be N + 1. (This may
198 also be written %M$.*s, provided N is not otherwise used.) The
199 format string must have conversion specifiers with argument numbers
200 1 up to highest argument; each argument may only be used once.
201 A format string can have at most 30 arguments. */
203 /* Formatting phases 1 and 2: render TEXT->format_spec plus
204 TEXT->args_ptr into a series of chunks in PP->buffer->args[].
205 Phase 3 is in pp_base_format_text. */
207 void
208 pp_base_format (pretty_printer *pp, text_info *text)
210 output_buffer *buffer = pp->buffer;
211 const char *p;
212 const char **args;
213 struct chunk_info *new_chunk_array;
215 unsigned int curarg = 0, chunk = 0, argno;
216 pp_wrapping_mode_t old_wrapping_mode;
217 bool any_unnumbered = false, any_numbered = false;
218 const char **formatters[PP_NL_ARGMAX];
220 /* Allocate a new chunk structure. */
221 new_chunk_array = XOBNEW (&buffer->chunk_obstack, struct chunk_info);
222 new_chunk_array->prev = buffer->cur_chunk_array;
223 buffer->cur_chunk_array = new_chunk_array;
224 args = new_chunk_array->args;
226 /* Formatting phase 1: split up TEXT->format_spec into chunks in
227 PP->buffer->args[]. Even-numbered chunks are to be output
228 verbatim, odd-numbered chunks are format specifiers.
229 %m, %%, %<, %>, and %' are replaced with the appropriate text at
230 this point. */
232 memset (formatters, 0, sizeof formatters);
234 for (p = text->format_spec; *p; )
236 while (*p != '\0' && *p != '%')
238 obstack_1grow (&buffer->chunk_obstack, *p);
239 p++;
242 if (*p == '\0')
243 break;
245 switch (*++p)
247 case '\0':
248 gcc_unreachable ();
250 case '%':
251 obstack_1grow (&buffer->chunk_obstack, '%');
252 p++;
253 continue;
255 case '<':
256 obstack_grow (&buffer->chunk_obstack,
257 open_quote, strlen (open_quote));
258 p++;
259 continue;
261 case '>':
262 case '\'':
263 obstack_grow (&buffer->chunk_obstack,
264 close_quote, strlen (close_quote));
265 p++;
266 continue;
268 case 'm':
270 const char *errstr = xstrerror (text->err_no);
271 obstack_grow (&buffer->chunk_obstack, errstr, strlen (errstr));
273 p++;
274 continue;
276 default:
277 /* Handled in phase 2. Terminate the plain chunk here. */
278 obstack_1grow (&buffer->chunk_obstack, '\0');
279 gcc_assert (chunk < PP_NL_ARGMAX * 2);
280 args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
281 break;
284 if (ISDIGIT (*p))
286 char *end;
287 argno = strtoul (p, &end, 10) - 1;
288 p = end;
289 gcc_assert (*p == '$');
290 p++;
292 any_numbered = true;
293 gcc_assert (!any_unnumbered);
295 else
297 argno = curarg++;
298 any_unnumbered = true;
299 gcc_assert (!any_numbered);
301 gcc_assert (argno < PP_NL_ARGMAX);
302 gcc_assert (!formatters[argno]);
303 formatters[argno] = &args[chunk];
306 obstack_1grow (&buffer->chunk_obstack, *p);
307 p++;
309 while (strchr ("qwl+#", p[-1]));
311 if (p[-1] == '.')
313 /* We handle '%.Ns' and '%.*s' or '%M$.*N$s'
314 (where M == N + 1). */
315 if (ISDIGIT (*p))
319 obstack_1grow (&buffer->chunk_obstack, *p);
320 p++;
322 while (ISDIGIT (p[-1]));
323 gcc_assert (p[-1] == 's');
325 else
327 gcc_assert (*p == '*');
328 obstack_1grow (&buffer->chunk_obstack, '*');
329 p++;
331 if (ISDIGIT (*p))
333 char *end;
334 unsigned int argno2 = strtoul (p, &end, 10) - 1;
335 p = end;
336 gcc_assert (argno2 == argno - 1);
337 gcc_assert (!any_unnumbered);
338 gcc_assert (*p == '$');
340 p++;
341 formatters[argno2] = formatters[argno];
343 else
345 gcc_assert (!any_numbered);
346 formatters[argno+1] = formatters[argno];
347 curarg++;
349 gcc_assert (*p == 's');
350 obstack_1grow (&buffer->chunk_obstack, 's');
351 p++;
354 if (*p == '\0')
355 break;
357 obstack_1grow (&buffer->chunk_obstack, '\0');
358 gcc_assert (chunk < PP_NL_ARGMAX * 2);
359 args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
362 obstack_1grow (&buffer->chunk_obstack, '\0');
363 gcc_assert (chunk < PP_NL_ARGMAX * 2);
364 args[chunk++] = XOBFINISH (&buffer->chunk_obstack, const char *);
365 args[chunk] = 0;
367 /* Set output to the argument obstack, and switch line-wrapping and
368 prefixing off. */
369 buffer->obstack = &buffer->chunk_obstack;
370 old_wrapping_mode = pp_set_verbatim_wrapping (pp);
372 /* Second phase. Replace each formatter with the formatted text it
373 corresponds to. */
375 for (argno = 0; formatters[argno]; argno++)
377 int precision = 0;
378 bool wide = false;
379 bool plus = false;
380 bool hash = false;
381 bool quote = false;
383 /* We do not attempt to enforce any ordering on the modifier
384 characters. */
386 for (p = *formatters[argno];; p++)
388 switch (*p)
390 case 'q':
391 gcc_assert (!quote);
392 quote = true;
393 continue;
395 case '+':
396 gcc_assert (!plus);
397 plus = true;
398 continue;
400 case '#':
401 gcc_assert (!hash);
402 hash = true;
403 continue;
405 case 'w':
406 gcc_assert (!wide);
407 wide = true;
408 continue;
410 case 'l':
411 /* We don't support precision beyond that of "long long". */
412 gcc_assert (precision < 2);
413 precision++;
414 continue;
416 break;
419 gcc_assert (!wide || precision == 0);
421 if (quote)
422 pp_string (pp, open_quote);
424 switch (*p)
426 case 'c':
427 pp_character (pp, va_arg (*text->args_ptr, int));
428 break;
430 case 'd':
431 case 'i':
432 if (wide)
433 pp_wide_integer (pp, va_arg (*text->args_ptr, HOST_WIDE_INT));
434 else
435 pp_integer_with_precision
436 (pp, *text->args_ptr, precision, int, "d");
437 break;
439 case 'o':
440 if (wide)
441 pp_scalar (pp, "%" HOST_WIDE_INT_PRINT "o",
442 va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
443 else
444 pp_integer_with_precision
445 (pp, *text->args_ptr, precision, unsigned, "o");
446 break;
448 case 's':
449 pp_string (pp, va_arg (*text->args_ptr, const char *));
450 break;
452 case 'p':
453 pp_pointer (pp, va_arg (*text->args_ptr, void *));
454 break;
456 case 'u':
457 if (wide)
458 pp_scalar (pp, HOST_WIDE_INT_PRINT_UNSIGNED,
459 va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
460 else
461 pp_integer_with_precision
462 (pp, *text->args_ptr, precision, unsigned, "u");
463 break;
465 case 'x':
466 if (wide)
467 pp_scalar (pp, HOST_WIDE_INT_PRINT_HEX,
468 va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
469 else
470 pp_integer_with_precision
471 (pp, *text->args_ptr, precision, unsigned, "x");
472 break;
474 case 'H':
476 location_t *locus = va_arg (*text->args_ptr, location_t *);
477 gcc_assert (text->locus != NULL);
478 *text->locus = *locus;
480 break;
482 case 'J':
484 tree t = va_arg (*text->args_ptr, tree);
485 gcc_assert (text->locus != NULL);
486 *text->locus = DECL_SOURCE_LOCATION (t);
488 break;
490 case '.':
492 int n;
493 const char *s;
495 /* We handle '%.Ns' and '%.*s' or '%M$.*N$s'
496 (where M == N + 1). The format string should be verified
497 already from the first phase. */
498 p++;
499 if (ISDIGIT (*p))
501 char *end;
502 n = strtoul (p, &end, 10);
503 p = end;
504 gcc_assert (*p == 's');
506 else
508 gcc_assert (*p == '*');
509 p++;
510 gcc_assert (*p == 's');
511 n = va_arg (*text->args_ptr, int);
513 /* This consumes a second entry in the formatters array. */
514 gcc_assert (formatters[argno] == formatters[argno+1]);
515 argno++;
518 s = va_arg (*text->args_ptr, const char *);
519 pp_append_text (pp, s, s + n);
521 break;
523 default:
525 bool ok;
527 gcc_assert (pp_format_decoder (pp));
528 ok = pp_format_decoder (pp) (pp, text, p,
529 precision, wide, plus, hash);
530 gcc_assert (ok);
534 if (quote)
535 pp_string (pp, close_quote);
537 obstack_1grow (&buffer->chunk_obstack, '\0');
538 *formatters[argno] = XOBFINISH (&buffer->chunk_obstack, const char *);
541 #ifdef ENABLE_CHECKING
542 for (; argno < PP_NL_ARGMAX; argno++)
543 gcc_assert (!formatters[argno]);
544 #endif
546 /* Revert to normal obstack and wrapping mode. */
547 buffer->obstack = &buffer->formatted_obstack;
548 buffer->line_length = 0;
549 pp_wrapping_mode (pp) = old_wrapping_mode;
550 pp_clear_state (pp);
553 /* Format of a message pointed to by TEXT. */
554 void
555 pp_base_output_formatted_text (pretty_printer *pp)
557 unsigned int chunk;
558 output_buffer *buffer = pp_buffer (pp);
559 struct chunk_info *chunk_array = buffer->cur_chunk_array;
560 const char **args = chunk_array->args;
562 gcc_assert (buffer->obstack == &buffer->formatted_obstack);
563 gcc_assert (buffer->line_length == 0);
565 /* This is a third phase, first 2 phases done in pp_base_format_args.
566 Now we actually print it. */
567 for (chunk = 0; args[chunk]; chunk++)
568 pp_string (pp, args[chunk]);
570 /* Deallocate the chunk structure and everything after it (i.e. the
571 associated series of formatted strings). */
572 buffer->cur_chunk_array = chunk_array->prev;
573 obstack_free (&buffer->chunk_obstack, chunk_array);
576 /* Helper subroutine of output_verbatim and verbatim. Do the appropriate
577 settings needed by BUFFER for a verbatim formatting. */
578 void
579 pp_base_format_verbatim (pretty_printer *pp, text_info *text)
581 /* Set verbatim mode. */
582 pp_wrapping_mode_t oldmode = pp_set_verbatim_wrapping (pp);
584 /* Do the actual formatting. */
585 pp_format (pp, text);
586 pp_output_formatted_text (pp);
588 /* Restore previous settings. */
589 pp_wrapping_mode (pp) = oldmode;
592 /* Flush the content of BUFFER onto the attached stream. */
593 void
594 pp_base_flush (pretty_printer *pp)
596 pp_write_text_to_stream (pp);
597 pp_clear_state (pp);
598 fputc ('\n', pp->buffer->stream);
599 fflush (pp->buffer->stream);
600 pp_needs_newline (pp) = false;
603 /* Sets the number of maximum characters per line PRETTY-PRINTER can
604 output in line-wrapping mode. A LENGTH value 0 suppresses
605 line-wrapping. */
606 void
607 pp_base_set_line_maximum_length (pretty_printer *pp, int length)
609 pp_line_cutoff (pp) = length;
610 pp_set_real_maximum_length (pp);
613 /* Clear PRETTY-PRINTER output area text info. */
614 void
615 pp_base_clear_output_area (pretty_printer *pp)
617 obstack_free (pp->buffer->obstack, obstack_base (pp->buffer->obstack));
618 pp->buffer->line_length = 0;
621 /* Set PREFIX for PRETTY-PRINTER. */
622 void
623 pp_base_set_prefix (pretty_printer *pp, const char *prefix)
625 pp->prefix = prefix;
626 pp_set_real_maximum_length (pp);
627 pp->emitted_prefix = false;
628 pp_indentation (pp) = 0;
631 /* Free PRETTY-PRINTER's prefix, a previously malloc()'d string. */
632 void
633 pp_base_destroy_prefix (pretty_printer *pp)
635 if (pp->prefix != NULL)
637 free ((char *) pp->prefix);
638 pp->prefix = NULL;
642 /* Write out PRETTY-PRINTER's prefix. */
643 void
644 pp_base_emit_prefix (pretty_printer *pp)
646 if (pp->prefix != NULL)
648 switch (pp_prefixing_rule (pp))
650 default:
651 case DIAGNOSTICS_SHOW_PREFIX_NEVER:
652 break;
654 case DIAGNOSTICS_SHOW_PREFIX_ONCE:
655 if (pp->emitted_prefix)
657 pp_base_indent (pp);
658 break;
660 pp_indentation (pp) += 3;
661 /* Fall through. */
663 case DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE:
665 int prefix_length = strlen (pp->prefix);
666 pp_append_r (pp, pp->prefix, prefix_length);
667 pp->emitted_prefix = true;
669 break;
674 /* Construct a PRETTY-PRINTER with PREFIX and of MAXIMUM_LENGTH
675 characters per line. */
676 void
677 pp_construct (pretty_printer *pp, const char *prefix, int maximum_length)
679 memset (pp, 0, sizeof (pretty_printer));
680 pp->buffer = XCNEW (output_buffer);
681 obstack_init (&pp->buffer->chunk_obstack);
682 obstack_init (&pp->buffer->formatted_obstack);
683 pp->buffer->obstack = &pp->buffer->formatted_obstack;
684 pp->buffer->stream = stderr;
685 pp_line_cutoff (pp) = maximum_length;
686 pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
687 pp_set_prefix (pp, prefix);
690 /* Append a string delimited by START and END to the output area of
691 PRETTY-PRINTER. No line wrapping is done. However, if beginning a
692 new line then emit PRETTY-PRINTER's prefix and skip any leading
693 whitespace if appropriate. The caller must ensure that it is
694 safe to do so. */
695 void
696 pp_base_append_text (pretty_printer *pp, const char *start, const char *end)
698 /* Emit prefix and skip whitespace if we're starting a new line. */
699 if (pp->buffer->line_length == 0)
701 pp_emit_prefix (pp);
702 if (pp_is_wrapping_line (pp))
703 while (start != end && *start == ' ')
704 ++start;
706 pp_append_r (pp, start, end - start);
709 /* Finishes constructing a NULL-terminated character string representing
710 the PRETTY-PRINTED text. */
711 const char *
712 pp_base_formatted_text (pretty_printer *pp)
714 obstack_1grow (pp->buffer->obstack, '\0');
715 return pp_formatted_text_data (pp);
718 /* Return a pointer to the last character emitted in PRETTY-PRINTER's
719 output area. A NULL pointer means no character available. */
720 const char *
721 pp_base_last_position_in_text (const pretty_printer *pp)
723 const char *p = NULL;
724 struct obstack *text = pp->buffer->obstack;
726 if (obstack_base (text) != obstack_next_free (text))
727 p = ((const char *) obstack_next_free (text)) - 1;
728 return p;
731 /* Return the amount of characters PRETTY-PRINTER can accept to
732 make a full line. Meaningful only in line-wrapping mode. */
734 pp_base_remaining_character_count_for_line (pretty_printer *pp)
736 return pp->maximum_length - pp->buffer->line_length;
740 /* Format a message into BUFFER a la printf. */
741 void
742 pp_printf (pretty_printer *pp, const char *msg, ...)
744 text_info text;
745 va_list ap;
747 va_start (ap, msg);
748 text.err_no = errno;
749 text.args_ptr = &ap;
750 text.format_spec = msg;
751 text.locus = NULL;
752 pp_format (pp, &text);
753 pp_output_formatted_text (pp);
754 va_end (ap);
758 /* Output MESSAGE verbatim into BUFFER. */
759 void
760 pp_verbatim (pretty_printer *pp, const char *msg, ...)
762 text_info text;
763 va_list ap;
765 va_start (ap, msg);
766 text.err_no = errno;
767 text.args_ptr = &ap;
768 text.format_spec = msg;
769 text.locus = NULL;
770 pp_format_verbatim (pp, &text);
771 va_end (ap);
776 /* Have PRETTY-PRINTER start a new line. */
777 void
778 pp_base_newline (pretty_printer *pp)
780 obstack_1grow (pp->buffer->obstack, '\n');
781 pp->buffer->line_length = 0;
784 /* Have PRETTY-PRINTER add a CHARACTER. */
785 void
786 pp_base_character (pretty_printer *pp, int c)
788 if (pp_is_wrapping_line (pp)
789 && pp_remaining_character_count_for_line (pp) <= 0)
791 pp_newline (pp);
792 if (ISSPACE (c))
793 return;
795 obstack_1grow (pp->buffer->obstack, c);
796 ++pp->buffer->line_length;
799 /* Append a STRING to the output area of PRETTY-PRINTER; the STRING may
800 be line-wrapped if in appropriate mode. */
801 void
802 pp_base_string (pretty_printer *pp, const char *str)
804 pp_maybe_wrap_text (pp, str, str + (str ? strlen (str) : 0));
807 /* Maybe print out a whitespace if needed. */
809 void
810 pp_base_maybe_space (pretty_printer *pp)
812 if (pp_base (pp)->padding != pp_none)
814 pp_space (pp);
815 pp_base (pp)->padding = pp_none;