gdb/ui-out.c

   1 /* Output generating routines for GDB.
   2
   3    Copyright (C) 1999-2016 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Solutions.
   6    Written by Fernando Nasser for Cygnus.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "expression.h"         /* For language.h */
  25 #include "language.h"
  26 #include "ui-out.h"
  27
  28 #include <vector>
  29 #include <memory>
  30 #include <string>
  31
  32 /* A header of a ui_out_table.  */
  33
  34 class ui_out_hdr
  35 {
  36  public:
  37
  38   explicit ui_out_hdr (int number, int min_width, ui_align alignment,
  39                        const std::string &name, const std::string &header)
  40   : m_number (number),
  41     m_min_width (min_width),
  42     m_alignment (alignment),
  43     m_name (name),
  44     m_header (header)
  45   {
  46   }
  47
  48   int number () const
  49   {
  50     return m_number;
  51   }
  52
  53   int min_width () const
  54   {
  55     return m_min_width;
  56   }
  57
  58   ui_align alignment () const
  59   {
  60     return m_alignment;
  61   }
  62
  63   const std::string &header () const
  64   {
  65     return m_header;
  66   }
  67
  68   const std::string &name () const
  69   {
  70     return m_name;
  71   }
  72
  73  private:
  74
  75   /* The number of the table column this header represents, 1-based.  */
  76   int m_number;
  77
  78   /* Minimal column width in characters.  May or may not be applicable,
  79      depending on the actual implementation of ui_out.  */
  80   int m_min_width;
  81
  82   /* Alignment of the content in the column.  May or may not be applicable,
  83      depending on the actual implementation of ui_out.  */
  84   ui_align m_alignment;
  85
  86   /* Internal column name, used to internally refer to the column.  */
  87   std::string m_name;
  88
  89   /* Printed header text of the column.  */
  90   std::string m_header;
  91 };
  92
  93 /* A level of nesting (either a list or a tuple) in a ui_out output.  */
  94
  95 class ui_out_level
  96 {
  97  public:
  98
  99   explicit ui_out_level (ui_out_type type)
 100   : m_type (type),
 101     m_field_count (0)
 102   {
 103   }
 104
 105   ui_out_type type () const
 106   {
 107     return m_type;
 108   }
 109
 110   int field_count () const
 111   {
 112     return m_field_count;
 113   }
 114
 115   void inc_field_count ()
 116   {
 117     m_field_count++;
 118   }
 119
 120  private:
 121
 122   /* The type of this level.  */
 123   ui_out_type m_type;
 124
 125   /* Count each field; the first element is for non-list fields.  */
 126   int m_field_count;
 127 };
 128
 129 /* States (steps) of a table generation.  */
 130
 131 enum ui_out_table_state
 132 {
 133   /* We are generating the table headers.  */
 134   TABLE_STATE_HEADERS,
 135
 136   /* We are generating the table body.  */
 137   TABLE_STATE_BODY,
 138 };
 139
 140 /* Tables are special.  Maintain a separate structure that tracks
 141    their state.  At present an output can only contain a single table
 142    but that restriction might eventually be lifted.  */
 143
 144 struct ui_out_table
 145 {
 146   /* If on, a table is being generated.  */
 147   int flag;
 148
 149   ui_out_table_state state;
 150
 151   /* The level at which each entry of the table is to be found.  A row
 152      (a tuple) is made up of entries.  Consequently ENTRY_LEVEL is one
 153      above that of the table.  */
 154   int entry_level;
 155
 156   /* Number of table columns (as specified in the table_begin call).  */
 157   int columns;
 158
 159   /* String identifying the table (as specified in the table_begin
 160      call).  */
 161   std::string id;
 162
 163   /* Pointers to the column headers.  */
 164   std::vector<std::unique_ptr<ui_out_hdr>> headers;
 165
 166   /* Iterator over the headers vector, used when printing successive fields.  */
 167   std::vector<std::unique_ptr<ui_out_hdr>>::const_iterator headers_iterator;
 168
 169 };
 170
 171
 172 /* The ui_out structure */
 173
 174 struct ui_out
 175   {
 176     int flags;
 177     /* Specific implementation of ui-out.  */
 178     const struct ui_out_impl *impl;
 179     void *data;
 180
 181     /* Vector to store and track the ui-out levels.  */
 182     std::vector<std::unique_ptr<ui_out_level>> levels;
 183
 184     int level () const
 185     {
 186       return this->levels.size ();
 187     }
 188
 189     /* A table, if any.  At present only a single table is supported.  */
 190     struct ui_out_table table;
 191   };
 192
 193 /* The current (inner most) level.  */
 194 static ui_out_level *
 195 current_level (struct ui_out *uiout)
 196 {
 197   return uiout->levels.back ().get ();
 198 }
 199
 200 /* Create a new level, of TYPE.  */
 201 static void
 202 push_level (struct ui_out *uiout,
 203             enum ui_out_type type)
 204 {
 205   std::unique_ptr<ui_out_level> level (new ui_out_level (type));
 206
 207   uiout->levels.push_back (std::move (level));
 208 }
 209
 210 /* Discard the current level.  TYPE is the type of the level being
 211    discarded.  */
 212 static void
 213 pop_level (struct ui_out *uiout,
 214            enum ui_out_type type)
 215 {
 216   /* We had better not underflow the buffer.  */
 217   gdb_assert (uiout->level () > 0);
 218   gdb_assert (current_level (uiout)->type () == type);
 219
 220   uiout->levels.pop_back ();
 221 }
 222
 223 /* These are the interfaces to implementation functions.  */
 224
 225 static void uo_table_begin (struct ui_out *uiout, int nbrofcols,
 226                             int nr_rows, const char *tblid);
 227 static void uo_table_body (struct ui_out *uiout);
 228 static void uo_table_end (struct ui_out *uiout);
 229 static void uo_table_header (struct ui_out *uiout, int width,
 230                              enum ui_align align,
 231                              const std::string &col_name,
 232                              const std::string &col_hdr);
 233 static void uo_begin (struct ui_out *uiout,
 234                       enum ui_out_type type,
 235                       const char *id);
 236 static void uo_end (struct ui_out *uiout,
 237                     enum ui_out_type type);
 238 static void uo_field_int (struct ui_out *uiout, int fldno, int width,
 239                           enum ui_align align, const char *fldname, int value);
 240 static void uo_field_skip (struct ui_out *uiout, int fldno, int width,
 241                            enum ui_align align, const char *fldname);
 242 static void uo_field_fmt (struct ui_out *uiout, int fldno, int width,
 243                           enum ui_align align, const char *fldname,
 244                           const char *format, va_list args)
 245      ATTRIBUTE_PRINTF (6, 0);
 246 static void uo_spaces (struct ui_out *uiout, int numspaces);
 247 static void uo_text (struct ui_out *uiout, const char *string);
 248 static void uo_message (struct ui_out *uiout,
 249                         const char *format, va_list args)
 250      ATTRIBUTE_PRINTF (2, 0);
 251 static void uo_wrap_hint (struct ui_out *uiout, const char *identstring);
 252 static void uo_flush (struct ui_out *uiout);
 253 static int uo_redirect (struct ui_out *uiout, struct ui_file *outstream);
 254
 255 /* Prototypes for local functions */
 256
 257 static void append_header_to_list (struct ui_out *uiout, int width,
 258                                    enum ui_align alignment,
 259                                    const std::string &col_name,
 260                                    const std::string &col_hdr);
 261 static int get_next_header (struct ui_out *uiout, int *colno, int *width,
 262                             enum ui_align *alignment, const char **col_hdr);
 263 static void clear_header_list (struct ui_out *uiout);
 264 static void clear_table (struct ui_out *uiout);
 265 static void verify_field (struct ui_out *uiout, int *fldno, int *width,
 266                           enum ui_align *align);
 267
 268 /* exported functions (ui_out API) */
 269
 270 /* Mark beginning of a table.  */
 271
 272 static void
 273 ui_out_table_begin (struct ui_out *uiout, int nbrofcols,
 274                     int nr_rows, const std::string &tblid)
 275 {
 276   if (uiout->table.flag)
 277     internal_error (__FILE__, __LINE__,
 278                     _("tables cannot be nested; table_begin found before \
 279 previous table_end."));
 280
 281   uiout->table.flag = 1;
 282   uiout->table.state = TABLE_STATE_HEADERS;
 283   uiout->table.entry_level = uiout->level () + 1;
 284   uiout->table.columns = nbrofcols;
 285   uiout->table.id = tblid;
 286
 287   clear_header_list (uiout);
 288
 289   uo_table_begin (uiout, nbrofcols, nr_rows, uiout->table.id.c_str ());
 290 }
 291
 292 void
 293 ui_out_table_body (struct ui_out *uiout)
 294 {
 295   if (!uiout->table.flag)
 296     internal_error (__FILE__, __LINE__,
 297                     _("table_body outside a table is not valid; it must be \
 298 after a table_begin and before a table_end."));
 299
 300   if (uiout->table.state == TABLE_STATE_BODY)
 301     internal_error (__FILE__, __LINE__,
 302                     _("extra table_body call not allowed; there must be \
 303 only one table_body after a table_begin and before a table_end."));
 304
 305   if (uiout->table.headers.size () != uiout->table.columns)
 306     internal_error (__FILE__, __LINE__,
 307                     _("number of headers differ from number of table \
 308 columns."));
 309
 310   uiout->table.state = TABLE_STATE_BODY;
 311
 312   uo_table_body (uiout);
 313 }
 314
 315 static void
 316 ui_out_table_end (struct ui_out *uiout)
 317 {
 318   if (!uiout->table.flag)
 319     internal_error (__FILE__, __LINE__,
 320                     _("misplaced table_end or missing table_begin."));
 321
 322   uiout->table.entry_level = 0;
 323   uiout->table.state = TABLE_STATE_HEADERS;
 324   uiout->table.flag = 0;
 325
 326   uo_table_end (uiout);
 327   clear_table (uiout);
 328 }
 329
 330 void
 331 ui_out_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 332                      const std::string &col_name, const std::string &col_hdr)
 333 {
 334   if (!uiout->table.flag || uiout->table.state != TABLE_STATE_HEADERS)
 335     internal_error (__FILE__, __LINE__,
 336                     _("table header must be specified after table_begin \
 337 and before table_body."));
 338
 339   append_header_to_list (uiout, width, alignment, col_name, col_hdr);
 340
 341   uo_table_header (uiout, width, alignment, col_name, col_hdr);
 342 }
 343
 344 static void
 345 do_cleanup_table_end (void *data)
 346 {
 347   struct ui_out *ui_out = (struct ui_out *) data;
 348
 349   ui_out_table_end (ui_out);
 350 }
 351
 352 struct cleanup *
 353 make_cleanup_ui_out_table_begin_end (struct ui_out *ui_out, int nr_cols,
 354                                      int nr_rows, const char *tblid)
 355 {
 356   ui_out_table_begin (ui_out, nr_cols, nr_rows, tblid);
 357   return make_cleanup (do_cleanup_table_end, ui_out);
 358 }
 359
 360 void
 361 ui_out_begin (struct ui_out *uiout,
 362               enum ui_out_type type,
 363               const char *id)
 364 {
 365   if (uiout->table.flag && uiout->table.state != TABLE_STATE_BODY)
 366     internal_error (__FILE__, __LINE__,
 367                     _("table header or table_body expected; lists must be \
 368 specified after table_body."));
 369
 370   /* Be careful to verify the ``field'' before the new tuple/list is
 371      pushed onto the stack.  That way the containing list/table/row is
 372      verified and not the newly created tuple/list.  This verification
 373      is needed (at least) for the case where a table row entry
 374      contains either a tuple/list.  For that case bookkeeping such as
 375      updating the column count or advancing to the next heading still
 376      needs to be performed.  */
 377   {
 378     int fldno;
 379     int width;
 380     enum ui_align align;
 381
 382     verify_field (uiout, &fldno, &width, &align);
 383   }
 384
 385   push_level (uiout, type);
 386
 387   /* If the push puts us at the same level as a table row entry, we've
 388      got a new table row.  Put the header pointer back to the start.  */
 389   if (uiout->table.state == TABLE_STATE_BODY
 390       && uiout->table.entry_level == uiout->level ())
 391     uiout->table.headers_iterator = uiout->table.headers.begin ();
 392
 393   uo_begin (uiout, type, id);
 394 }
 395
 396 void
 397 ui_out_end (struct ui_out *uiout,
 398             enum ui_out_type type)
 399 {
 400   pop_level (uiout, type);
 401
 402   uo_end (uiout, type);
 403 }
 404
 405 struct ui_out_end_cleanup_data
 406 {
 407   struct ui_out *uiout;
 408   enum ui_out_type type;
 409 };
 410
 411 static void
 412 do_cleanup_end (void *data)
 413 {
 414   struct ui_out_end_cleanup_data *end_cleanup_data
 415     = (struct ui_out_end_cleanup_data *) data;
 416
 417   ui_out_end (end_cleanup_data->uiout, end_cleanup_data->type);
 418   xfree (end_cleanup_data);
 419 }
 420
 421 static struct cleanup *
 422 make_cleanup_ui_out_end (struct ui_out *uiout,
 423                          enum ui_out_type type)
 424 {
 425   struct ui_out_end_cleanup_data *end_cleanup_data;
 426
 427   end_cleanup_data = XNEW (struct ui_out_end_cleanup_data);
 428   end_cleanup_data->uiout = uiout;
 429   end_cleanup_data->type = type;
 430   return make_cleanup (do_cleanup_end, end_cleanup_data);
 431 }
 432
 433 struct cleanup *
 434 make_cleanup_ui_out_tuple_begin_end (struct ui_out *uiout,
 435                                      const char *id)
 436 {
 437   ui_out_begin (uiout, ui_out_type_tuple, id);
 438   return make_cleanup_ui_out_end (uiout, ui_out_type_tuple);
 439 }
 440
 441 struct cleanup *
 442 make_cleanup_ui_out_list_begin_end (struct ui_out *uiout,
 443                                     const char *id)
 444 {
 445   ui_out_begin (uiout, ui_out_type_list, id);
 446   return make_cleanup_ui_out_end (uiout, ui_out_type_list);
 447 }
 448
 449 void
 450 ui_out_field_int (struct ui_out *uiout,
 451                   const char *fldname,
 452                   int value)
 453 {
 454   int fldno;
 455   int width;
 456   enum ui_align align;
 457
 458   verify_field (uiout, &fldno, &width, &align);
 459
 460   uo_field_int (uiout, fldno, width, align, fldname, value);
 461 }
 462
 463 void
 464 ui_out_field_fmt_int (struct ui_out *uiout,
 465                       int input_width,
 466                       enum ui_align input_align,
 467                       const char *fldname,
 468                       int value)
 469 {
 470   int fldno;
 471   int width;
 472   enum ui_align align;
 473
 474   verify_field (uiout, &fldno, &width, &align);
 475
 476   uo_field_int (uiout, fldno, input_width, input_align, fldname, value);
 477 }
 478
 479 /* Documented in ui-out.h.  */
 480
 481 void
 482 ui_out_field_core_addr (struct ui_out *uiout,
 483                         const char *fldname,
 484                         struct gdbarch *gdbarch,
 485                         CORE_ADDR address)
 486 {
 487   ui_out_field_string (uiout, fldname,
 488                        print_core_address (gdbarch, address));
 489 }
 490
 491 void
 492 ui_out_field_stream (struct ui_out *uiout,
 493                      const char *fldname,
 494                      struct ui_file *stream)
 495 {
 496   std::string buffer = ui_file_as_string (stream);
 497
 498   if (!buffer.empty ())
 499     ui_out_field_string (uiout, fldname, buffer.c_str ());
 500   else
 501     ui_out_field_skip (uiout, fldname);
 502   ui_file_rewind (stream);
 503 }
 504
 505 /* Used to omit a field.  */
 506
 507 void
 508 ui_out_field_skip (struct ui_out *uiout,
 509                    const char *fldname)
 510 {
 511   int fldno;
 512   int width;
 513   enum ui_align align;
 514
 515   verify_field (uiout, &fldno, &width, &align);
 516
 517   uo_field_skip (uiout, fldno, width, align, fldname);
 518 }
 519
 520 void
 521 ui_out_field_string (struct ui_out *uiout,
 522                      const char *fldname,
 523                      const char *string)
 524 {
 525   int fldno;
 526   int width;
 527   enum ui_align align;
 528
 529   verify_field (uiout, &fldno, &width, &align);
 530
 531   uo_field_string (uiout, fldno, width, align, fldname, string);
 532 }
 533
 534 /* VARARGS */
 535 void
 536 ui_out_field_fmt (struct ui_out *uiout,
 537                   const char *fldname,
 538                   const char *format, ...)
 539 {
 540   va_list args;
 541   int fldno;
 542   int width;
 543   enum ui_align align;
 544
 545   /* Will not align, but has to call anyway.  */
 546   verify_field (uiout, &fldno, &width, &align);
 547
 548   va_start (args, format);
 549
 550   uo_field_fmt (uiout, fldno, width, align, fldname, format, args);
 551
 552   va_end (args);
 553 }
 554
 555 void
 556 ui_out_spaces (struct ui_out *uiout, int numspaces)
 557 {
 558   uo_spaces (uiout, numspaces);
 559 }
 560
 561 void
 562 ui_out_text (struct ui_out *uiout,
 563              const char *string)
 564 {
 565   uo_text (uiout, string);
 566 }
 567
 568 void
 569 ui_out_message (struct ui_out *uiout, const char *format, ...)
 570 {
 571   va_list args;
 572
 573   va_start (args, format);
 574   uo_message (uiout, format, args);
 575   va_end (args);
 576 }
 577
 578 void
 579 ui_out_wrap_hint (struct ui_out *uiout, const char *identstring)
 580 {
 581   uo_wrap_hint (uiout, identstring);
 582 }
 583
 584 void
 585 ui_out_flush (struct ui_out *uiout)
 586 {
 587   uo_flush (uiout);
 588 }
 589
 590 int
 591 ui_out_redirect (struct ui_out *uiout, struct ui_file *outstream)
 592 {
 593   return uo_redirect (uiout, outstream);
 594 }
 595
 596 /* Test the flags against the mask given.  */
 597 int
 598 ui_out_test_flags (struct ui_out *uiout, int mask)
 599 {
 600   return (uiout->flags & mask);
 601 }
 602
 603 int
 604 ui_out_is_mi_like_p (struct ui_out *uiout)
 605 {
 606   return uiout->impl->is_mi_like_p;
 607 }
 608
 609 /* Interface to the implementation functions.  */
 610
 611 void
 612 uo_table_begin (struct ui_out *uiout, int nbrofcols,
 613                 int nr_rows,
 614                 const char *tblid)
 615 {
 616   if (!uiout->impl->table_begin)
 617     return;
 618   uiout->impl->table_begin (uiout, nbrofcols, nr_rows, tblid);
 619 }
 620
 621 void
 622 uo_table_body (struct ui_out *uiout)
 623 {
 624   if (!uiout->impl->table_body)
 625     return;
 626   uiout->impl->table_body (uiout);
 627 }
 628
 629 void
 630 uo_table_end (struct ui_out *uiout)
 631 {
 632   if (!uiout->impl->table_end)
 633     return;
 634   uiout->impl->table_end (uiout);
 635 }
 636
 637 void
 638 uo_table_header (struct ui_out *uiout, int width, enum ui_align align,
 639                  const std::string &col_name, const std::string &col_hdr)
 640 {
 641   if (!uiout->impl->table_header)
 642     return;
 643   uiout->impl->table_header (uiout, width, align, col_name, col_hdr);
 644 }
 645
 646 /* Clear the table associated with UIOUT.  */
 647
 648 static void
 649 clear_table (struct ui_out *uiout)
 650 {
 651   uiout->table.id.clear ();
 652   clear_header_list (uiout);
 653 }
 654
 655 void
 656 uo_begin (struct ui_out *uiout,
 657           enum ui_out_type type,
 658           const char *id)
 659 {
 660   if (uiout->impl->begin == NULL)
 661     return;
 662   uiout->impl->begin (uiout, type, id);
 663 }
 664
 665 void
 666 uo_end (struct ui_out *uiout,
 667         enum ui_out_type type)
 668 {
 669   if (uiout->impl->end == NULL)
 670     return;
 671   uiout->impl->end (uiout, type);
 672 }
 673
 674 void
 675 uo_field_int (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 676               const char *fldname,
 677               int value)
 678 {
 679   if (!uiout->impl->field_int)
 680     return;
 681   uiout->impl->field_int (uiout, fldno, width, align, fldname, value);
 682 }
 683
 684 void
 685 uo_field_skip (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 686                const char *fldname)
 687 {
 688   if (!uiout->impl->field_skip)
 689     return;
 690   uiout->impl->field_skip (uiout, fldno, width, align, fldname);
 691 }
 692
 693 void
 694 uo_field_string (struct ui_out *uiout, int fldno, int width,
 695                  enum ui_align align,
 696                  const char *fldname,
 697                  const char *string)
 698 {
 699   if (!uiout->impl->field_string)
 700     return;
 701   uiout->impl->field_string (uiout, fldno, width, align, fldname, string);
 702 }
 703
 704 void
 705 uo_field_fmt (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 706               const char *fldname,
 707               const char *format,
 708               va_list args)
 709 {
 710   if (!uiout->impl->field_fmt)
 711     return;
 712   uiout->impl->field_fmt (uiout, fldno, width, align, fldname, format, args);
 713 }
 714
 715 void
 716 uo_spaces (struct ui_out *uiout, int numspaces)
 717 {
 718   if (!uiout->impl->spaces)
 719     return;
 720   uiout->impl->spaces (uiout, numspaces);
 721 }
 722
 723 void
 724 uo_text (struct ui_out *uiout,
 725          const char *string)
 726 {
 727   if (!uiout->impl->text)
 728     return;
 729   uiout->impl->text (uiout, string);
 730 }
 731
 732 void
 733 uo_message (struct ui_out *uiout,
 734             const char *format,
 735             va_list args)
 736 {
 737   if (!uiout->impl->message)
 738     return;
 739   uiout->impl->message (uiout, format, args);
 740 }
 741
 742 void
 743 uo_wrap_hint (struct ui_out *uiout, const char *identstring)
 744 {
 745   if (!uiout->impl->wrap_hint)
 746     return;
 747   uiout->impl->wrap_hint (uiout, identstring);
 748 }
 749
 750 void
 751 uo_flush (struct ui_out *uiout)
 752 {
 753   if (!uiout->impl->flush)
 754     return;
 755   uiout->impl->flush (uiout);
 756 }
 757
 758 int
 759 uo_redirect (struct ui_out *uiout, struct ui_file *outstream)
 760 {
 761   if (!uiout->impl->redirect)
 762     return -1;
 763   return uiout->impl->redirect (uiout, outstream);
 764 }
 765
 766 /* local functions */
 767
 768 /* List of column headers manipulation routines.  */
 769
 770 static void
 771 clear_header_list (struct ui_out *uiout)
 772 {
 773   uiout->table.headers.clear ();
 774   uiout->table.headers_iterator = uiout->table.headers.end ();
 775 }
 776
 777 static void
 778 append_header_to_list (struct ui_out *uiout,
 779                        int width,
 780                        enum ui_align alignment,
 781                        const std::string &col_name,
 782                        const std::string &col_hdr)
 783 {
 784   std::unique_ptr<ui_out_hdr> temphdr(
 785     new ui_out_hdr (uiout->table.headers.size () + 1, width,
 786                     alignment, col_name, col_hdr));
 787
 788   uiout->table.headers.push_back (std::move (temphdr));
 789 }
 790
 791 /* Extract the format information for the NEXT header and advance
 792    the header pointer.  Return 0 if there was no next header.  */
 793
 794 static int
 795 get_next_header (struct ui_out *uiout,
 796                  int *colno,
 797                  int *width,
 798                  enum ui_align *alignment,
 799                  const char **col_hdr)
 800 {
 801   /* There may be no headers at all or we may have used all columns.  */
 802   if (uiout->table.headers_iterator == uiout->table.headers.end ())
 803     return 0;
 804
 805   ui_out_hdr *hdr = uiout->table.headers_iterator->get ();
 806
 807   *colno = hdr->number ();
 808   *width = hdr->min_width ();
 809   *alignment = hdr->alignment ();
 810   *col_hdr = hdr->header ().c_str ();
 811
 812   /* Advance the header pointer to the next entry.  */
 813   uiout->table.headers_iterator++;
 814
 815   return 1;
 816 }
 817
 818
 819 /* Verify that the field/tuple/list is correctly positioned.  Return
 820    the field number and corresponding alignment (if
 821    available/applicable).  */
 822
 823 static void
 824 verify_field (struct ui_out *uiout, int *fldno, int *width,
 825               enum ui_align *align)
 826 {
 827   ui_out_level *current = current_level (uiout);
 828   const char *text;
 829
 830   if (uiout->table.flag && uiout->table.state != TABLE_STATE_BODY)
 831     {
 832       internal_error (__FILE__, __LINE__,
 833                       _("table_body missing; table fields must be \
 834 specified after table_body and inside a list."));
 835     }
 836
 837   current->inc_field_count ();
 838
 839   if (uiout->table.state == TABLE_STATE_BODY
 840       && uiout->table.entry_level == uiout->level ()
 841       && get_next_header (uiout, fldno, width, align, &text))
 842     {
 843       if (*fldno != current->field_count ())
 844         internal_error (__FILE__, __LINE__,
 845                         _("ui-out internal error in handling headers."));
 846     }
 847   else
 848     {
 849       *width = 0;
 850       *align = ui_noalign;
 851       *fldno = current->field_count ();
 852     }
 853 }
 854
 855
 856 /* Access to ui-out members data.  */
 857
 858 void *
 859 ui_out_data (struct ui_out *uiout)
 860 {
 861   return uiout->data;
 862 }
 863
 864 /* Access table field parameters.  */
 865 int
 866 ui_out_query_field (struct ui_out *uiout, int colno,
 867                     int *width, int *alignment, const char **col_name)
 868 {
 869   if (!uiout->table.flag)
 870     return 0;
 871
 872   /* Column numbers are 1-based, so convert to 0-based index.  */
 873   int index = colno - 1;
 874
 875   if (index >= 0 && index < uiout->table.headers.size ())
 876     {
 877       ui_out_hdr *hdr = uiout->table.headers[index].get ();
 878
 879       gdb_assert (colno == hdr->number ());
 880
 881       *width = hdr->min_width ();
 882       *alignment = hdr->alignment ();
 883       *col_name = hdr->name ().c_str ();
 884
 885       return 1;
 886     }
 887   else
 888     return 0;
 889 }
 890
 891 /* Initialize private members at startup.  */
 892
 893 struct ui_out *
 894 ui_out_new (const struct ui_out_impl *impl, void *data,
 895             int flags)
 896 {
 897   struct ui_out *uiout = new ui_out ();
 898
 899   uiout->data = data;
 900   uiout->impl = impl;
 901   uiout->flags = flags;
 902   uiout->table.flag = 0;
 903   uiout->table.state = TABLE_STATE_HEADERS;
 904
 905   /* Create the ui-out level #1, the default level.  */
 906   push_level (uiout, ui_out_type_tuple);
 907
 908   uiout->table.headers_iterator = uiout->table.headers.end ();
 909
 910   return uiout;
 911 }