gdb/ui-out.c

   1 /* Output generating routines for GDB.
   2
   3    Copyright (C) 1999-2013 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 "gdb_string.h"
  25 #include "expression.h"         /* For language.h */
  26 #include "language.h"
  27 #include "ui-out.h"
  28 #include "gdb_assert.h"
  29
  30 /* table header structures */
  31
  32 struct ui_out_hdr
  33   {
  34     int colno;
  35     int width;
  36     int alignment;
  37     char *col_name;
  38     char *colhdr;
  39     struct ui_out_hdr *next;
  40   };
  41
  42 /* Maintain a stack so that the info applicable to the inner most list
  43    is always available.  Stack/nested level 0 is reserved for the
  44    top-level result.  */
  45
  46 enum { MAX_UI_OUT_LEVELS = 8 };
  47
  48 struct ui_out_level
  49   {
  50     /* Count each field; the first element is for non-list fields.  */
  51     int field_count;
  52     /* The type of this level.  */
  53     enum ui_out_type type;
  54   };
  55
  56 /* Tables are special.  Maintain a separate structure that tracks
  57    their state.  At present an output can only contain a single table
  58    but that restriction might eventually be lifted.  */
  59
  60 struct ui_out_table
  61 {
  62   /* If on, a table is being generated.  */
  63   int flag;
  64
  65   /* If on, the body of a table is being generated.  If off, the table
  66      header is being generated.  */
  67   int body_flag;
  68
  69   /* The level at which each entry of the table is to be found.  A row
  70      (a tuple) is made up of entries.  Consequently ENTRY_LEVEL is one
  71      above that of the table.  */
  72   int entry_level;
  73
  74   /* Number of table columns (as specified in the table_begin call).  */
  75   int columns;
  76
  77   /* String identifying the table (as specified in the table_begin
  78      call).  */
  79   char *id;
  80
  81   /* Points to the first table header (if any).  */
  82   struct ui_out_hdr *header_first;
  83
  84   /* Points to the last table header (if any).  */
  85   struct ui_out_hdr *header_last;
  86
  87   /* Points to header of NEXT column to format.  */
  88   struct ui_out_hdr *header_next;
  89
  90 };
  91
  92
  93 /* The ui_out structure */
  94 /* Any change here requires a corresponding one in the initialization
  95    of the default uiout, which is statically initialized.  */
  96
  97 struct ui_out
  98   {
  99     int flags;
 100     /* Specific implementation of ui-out.  */
 101     struct ui_out_impl *impl;
 102     void *data;
 103
 104     /* Sub structure tracking the ui-out depth.  */
 105     int level;
 106     struct ui_out_level levels[MAX_UI_OUT_LEVELS];
 107
 108     /* A table, if any.  At present only a single table is supported.  */
 109     struct ui_out_table table;
 110   };
 111
 112 /* The current (inner most) level.  */
 113 static struct ui_out_level *
 114 current_level (struct ui_out *uiout)
 115 {
 116   return &uiout->levels[uiout->level];
 117 }
 118
 119 /* Create a new level, of TYPE.  Return the new level's index.  */
 120 static int
 121 push_level (struct ui_out *uiout,
 122             enum ui_out_type type,
 123             const char *id)
 124 {
 125   struct ui_out_level *current;
 126
 127   /* We had better not overflow the buffer.  */
 128   uiout->level++;
 129   gdb_assert (uiout->level >= 0 && uiout->level < MAX_UI_OUT_LEVELS);
 130   current = current_level (uiout);
 131   current->field_count = 0;
 132   current->type = type;
 133   return uiout->level;
 134 }
 135
 136 /* Discard the current level, return the discarded level's index.
 137    TYPE is the type of the level being discarded.  */
 138 static int
 139 pop_level (struct ui_out *uiout,
 140            enum ui_out_type type)
 141 {
 142   /* We had better not underflow the buffer.  */
 143   gdb_assert (uiout->level > 0 && uiout->level < MAX_UI_OUT_LEVELS);
 144   gdb_assert (current_level (uiout)->type == type);
 145   uiout->level--;
 146   return uiout->level + 1;
 147 }
 148
 149
 150 /* These are the default implementation functions.  */
 151
 152 static void default_table_begin (struct ui_out *uiout, int nbrofcols,
 153                                  int nr_rows, const char *tblid);
 154 static void default_table_body (struct ui_out *uiout);
 155 static void default_table_end (struct ui_out *uiout);
 156 static void default_table_header (struct ui_out *uiout, int width,
 157                                   enum ui_align alig, const char *col_name,
 158                                   const char *colhdr);
 159 static void default_begin (struct ui_out *uiout,
 160                            enum ui_out_type type,
 161                            int level, const char *id);
 162 static void default_end (struct ui_out *uiout,
 163                          enum ui_out_type type,
 164                          int level);
 165 static void default_field_int (struct ui_out *uiout, int fldno, int width,
 166                                enum ui_align alig,
 167                                const char *fldname,
 168                                int value);
 169 static void default_field_skip (struct ui_out *uiout, int fldno, int width,
 170                                 enum ui_align alig,
 171                                 const char *fldname);
 172 static void default_field_string (struct ui_out *uiout, int fldno, int width,
 173                                   enum ui_align align,
 174                                   const char *fldname,
 175                                   const char *string);
 176 static void default_field_fmt (struct ui_out *uiout, int fldno,
 177                                int width, enum ui_align align,
 178                                const char *fldname,
 179                                const char *format,
 180                                va_list args) ATTRIBUTE_PRINTF (6, 0);
 181 static void default_spaces (struct ui_out *uiout, int numspaces);
 182 static void default_text (struct ui_out *uiout, const char *string);
 183 static void default_message (struct ui_out *uiout, int verbosity,
 184                              const char *format,
 185                              va_list args) ATTRIBUTE_PRINTF (3, 0);
 186 static void default_wrap_hint (struct ui_out *uiout, char *identstring);
 187 static void default_flush (struct ui_out *uiout);
 188 static void default_data_destroy (struct ui_out *uiout);
 189
 190 /* This is the default ui-out implementation functions vector.  */
 191
 192 struct ui_out_impl default_ui_out_impl =
 193 {
 194   default_table_begin,
 195   default_table_body,
 196   default_table_end,
 197   default_table_header,
 198   default_begin,
 199   default_end,
 200   default_field_int,
 201   default_field_skip,
 202   default_field_string,
 203   default_field_fmt,
 204   default_spaces,
 205   default_text,
 206   default_message,
 207   default_wrap_hint,
 208   default_flush,
 209   NULL,
 210   default_data_destroy,
 211   0, /* Does not need MI hacks.  */
 212 };
 213
 214 /* The default ui_out */
 215
 216 struct ui_out def_uiout =
 217 {
 218   0,                            /* flags */
 219   &default_ui_out_impl,         /* impl */
 220 };
 221
 222 /* Pointer to current ui_out */
 223 /* FIXME: This should not be a global, but something passed down from main.c
 224    or top.c.  */
 225
 226 struct ui_out *current_uiout = &def_uiout;
 227
 228 /* These are the interfaces to implementation functions.  */
 229
 230 static void uo_table_begin (struct ui_out *uiout, int nbrofcols,
 231                             int nr_rows, const char *tblid);
 232 static void uo_table_body (struct ui_out *uiout);
 233 static void uo_table_end (struct ui_out *uiout);
 234 static void uo_table_header (struct ui_out *uiout, int width,
 235                              enum ui_align align, const char *col_name,
 236                              const char *colhdr);
 237 static void uo_begin (struct ui_out *uiout,
 238                       enum ui_out_type type,
 239                       int level, const char *id);
 240 static void uo_end (struct ui_out *uiout,
 241                     enum ui_out_type type,
 242                     int level);
 243 static void uo_field_int (struct ui_out *uiout, int fldno, int width,
 244                           enum ui_align align, const char *fldname, int value);
 245 static void uo_field_skip (struct ui_out *uiout, int fldno, int width,
 246                            enum ui_align align, const char *fldname);
 247 static void uo_field_fmt (struct ui_out *uiout, int fldno, int width,
 248                           enum ui_align align, const char *fldname,
 249                           const char *format, va_list args)
 250      ATTRIBUTE_PRINTF (6, 0);
 251 static void uo_spaces (struct ui_out *uiout, int numspaces);
 252 static void uo_text (struct ui_out *uiout, const char *string);
 253 static void uo_message (struct ui_out *uiout, int verbosity,
 254                         const char *format, va_list args)
 255      ATTRIBUTE_PRINTF (3, 0);
 256 static void uo_wrap_hint (struct ui_out *uiout, char *identstring);
 257 static void uo_flush (struct ui_out *uiout);
 258 static int uo_redirect (struct ui_out *uiout, struct ui_file *outstream);
 259 static void uo_data_destroy (struct ui_out *uiout);
 260
 261 /* Prototypes for local functions */
 262
 263 extern void _initialize_ui_out (void);
 264 static void append_header_to_list (struct ui_out *uiout, int width,
 265                                    int alignment, const char *col_name,
 266                                    const char *colhdr);
 267 static int get_next_header (struct ui_out *uiout, int *colno, int *width,
 268                             int *alignment, char **colhdr);
 269 static void clear_header_list (struct ui_out *uiout);
 270 static void clear_table (struct ui_out *uiout);
 271 static void verify_field (struct ui_out *uiout, int *fldno, int *width,
 272                           int *align);
 273
 274 /* exported functions (ui_out API) */
 275
 276 /* Mark beginning of a table.  */
 277
 278 static void
 279 ui_out_table_begin (struct ui_out *uiout, int nbrofcols,
 280                     int nr_rows,
 281                     const char *tblid)
 282 {
 283   if (uiout->table.flag)
 284     internal_error (__FILE__, __LINE__,
 285                     _("tables cannot be nested; table_begin found before \
 286 previous table_end."));
 287
 288   uiout->table.flag = 1;
 289   uiout->table.body_flag = 0;
 290   uiout->table.entry_level = uiout->level + 1;
 291   uiout->table.columns = nbrofcols;
 292   if (tblid != NULL)
 293     uiout->table.id = xstrdup (tblid);
 294   else
 295     uiout->table.id = NULL;
 296   clear_header_list (uiout);
 297
 298   uo_table_begin (uiout, nbrofcols, nr_rows, uiout->table.id);
 299 }
 300
 301 void
 302 ui_out_table_body (struct ui_out *uiout)
 303 {
 304   if (!uiout->table.flag)
 305     internal_error (__FILE__, __LINE__,
 306                     _("table_body outside a table is not valid; it must be \
 307 after a table_begin and before a table_end."));
 308   if (uiout->table.body_flag)
 309     internal_error (__FILE__, __LINE__,
 310                     _("extra table_body call not allowed; there must be \
 311 only one table_body after a table_begin and before a table_end."));
 312   if (uiout->table.header_next->colno != uiout->table.columns)
 313     internal_error (__FILE__, __LINE__,
 314                     _("number of headers differ from number of table \
 315 columns."));
 316
 317   uiout->table.body_flag = 1;
 318   uiout->table.header_next = uiout->table.header_first;
 319
 320   uo_table_body (uiout);
 321 }
 322
 323 static void
 324 ui_out_table_end (struct ui_out *uiout)
 325 {
 326   if (!uiout->table.flag)
 327     internal_error (__FILE__, __LINE__,
 328                     _("misplaced table_end or missing table_begin."));
 329
 330   uiout->table.entry_level = 0;
 331   uiout->table.body_flag = 0;
 332   uiout->table.flag = 0;
 333
 334   uo_table_end (uiout);
 335   clear_table (uiout);
 336 }
 337
 338 void
 339 ui_out_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 340                      const char *col_name,
 341                      const char *colhdr)
 342 {
 343   if (!uiout->table.flag || uiout->table.body_flag)
 344     internal_error (__FILE__, __LINE__,
 345                     _("table header must be specified after table_begin \
 346 and before table_body."));
 347
 348   append_header_to_list (uiout, width, alignment, col_name, colhdr);
 349
 350   uo_table_header (uiout, width, alignment, col_name, colhdr);
 351 }
 352
 353 static void
 354 do_cleanup_table_end (void *data)
 355 {
 356   struct ui_out *ui_out = data;
 357
 358   ui_out_table_end (ui_out);
 359 }
 360
 361 struct cleanup *
 362 make_cleanup_ui_out_table_begin_end (struct ui_out *ui_out, int nr_cols,
 363                                      int nr_rows, const char *tblid)
 364 {
 365   ui_out_table_begin (ui_out, nr_cols, nr_rows, tblid);
 366   return make_cleanup (do_cleanup_table_end, ui_out);
 367 }
 368
 369 void
 370 ui_out_begin (struct ui_out *uiout,
 371               enum ui_out_type type,
 372               const char *id)
 373 {
 374   int new_level;
 375
 376   if (uiout->table.flag && !uiout->table.body_flag)
 377     internal_error (__FILE__, __LINE__,
 378                     _("table header or table_body expected; lists must be \
 379 specified after table_body."));
 380
 381   /* Be careful to verify the ``field'' before the new tuple/list is
 382      pushed onto the stack.  That way the containing list/table/row is
 383      verified and not the newly created tuple/list.  This verification
 384      is needed (at least) for the case where a table row entry
 385      contains either a tuple/list.  For that case bookkeeping such as
 386      updating the column count or advancing to the next heading still
 387      needs to be performed.  */
 388   {
 389     int fldno;
 390     int width;
 391     int align;
 392
 393     verify_field (uiout, &fldno, &width, &align);
 394   }
 395
 396   new_level = push_level (uiout, type, id);
 397
 398   /* If the push puts us at the same level as a table row entry, we've
 399      got a new table row.  Put the header pointer back to the start.  */
 400   if (uiout->table.body_flag
 401       && uiout->table.entry_level == new_level)
 402     uiout->table.header_next = uiout->table.header_first;
 403
 404   uo_begin (uiout, type, new_level, id);
 405 }
 406
 407 void
 408 ui_out_end (struct ui_out *uiout,
 409             enum ui_out_type type)
 410 {
 411   int old_level = pop_level (uiout, type);
 412
 413   uo_end (uiout, type, old_level);
 414 }
 415
 416 struct ui_out_end_cleanup_data
 417 {
 418   struct ui_out *uiout;
 419   enum ui_out_type type;
 420 };
 421
 422 static void
 423 do_cleanup_end (void *data)
 424 {
 425   struct ui_out_end_cleanup_data *end_cleanup_data = data;
 426
 427   ui_out_end (end_cleanup_data->uiout, end_cleanup_data->type);
 428   xfree (end_cleanup_data);
 429 }
 430
 431 static struct cleanup *
 432 make_cleanup_ui_out_end (struct ui_out *uiout,
 433                          enum ui_out_type type)
 434 {
 435   struct ui_out_end_cleanup_data *end_cleanup_data;
 436
 437   end_cleanup_data = XMALLOC (struct ui_out_end_cleanup_data);
 438   end_cleanup_data->uiout = uiout;
 439   end_cleanup_data->type = type;
 440   return make_cleanup (do_cleanup_end, end_cleanup_data);
 441 }
 442
 443 struct cleanup *
 444 make_cleanup_ui_out_tuple_begin_end (struct ui_out *uiout,
 445                                      const char *id)
 446 {
 447   ui_out_begin (uiout, ui_out_type_tuple, id);
 448   return make_cleanup_ui_out_end (uiout, ui_out_type_tuple);
 449 }
 450
 451 struct cleanup *
 452 make_cleanup_ui_out_list_begin_end (struct ui_out *uiout,
 453                                     const char *id)
 454 {
 455   ui_out_begin (uiout, ui_out_type_list, id);
 456   return make_cleanup_ui_out_end (uiout, ui_out_type_list);
 457 }
 458
 459 void
 460 ui_out_field_int (struct ui_out *uiout,
 461                   const char *fldname,
 462                   int value)
 463 {
 464   int fldno;
 465   int width;
 466   int align;
 467
 468   verify_field (uiout, &fldno, &width, &align);
 469
 470   uo_field_int (uiout, fldno, width, align, fldname, value);
 471 }
 472
 473 void
 474 ui_out_field_fmt_int (struct ui_out *uiout,
 475                       int input_width,
 476                       enum ui_align input_align,
 477                       const char *fldname,
 478                       int value)
 479 {
 480   int fldno;
 481   int width;
 482   int align;
 483
 484   verify_field (uiout, &fldno, &width, &align);
 485
 486   uo_field_int (uiout, fldno, input_width, input_align, fldname, value);
 487 }
 488
 489 /* Documented in ui-out.h.  */
 490
 491 void
 492 ui_out_field_core_addr (struct ui_out *uiout,
 493                         const char *fldname,
 494                         struct gdbarch *gdbarch,
 495                         CORE_ADDR address)
 496 {
 497   ui_out_field_string (uiout, fldname,
 498                        print_core_address (gdbarch, address));
 499 }
 500
 501 void
 502 ui_out_field_stream (struct ui_out *uiout,
 503                      const char *fldname,
 504                      struct ui_file *stream)
 505 {
 506   long length;
 507   char *buffer = ui_file_xstrdup (stream, &length);
 508   struct cleanup *old_cleanup = make_cleanup (xfree, buffer);
 509
 510   if (length > 0)
 511     ui_out_field_string (uiout, fldname, buffer);
 512   else
 513     ui_out_field_skip (uiout, fldname);
 514   ui_file_rewind (stream);
 515   do_cleanups (old_cleanup);
 516 }
 517
 518 /* Used to omit a field.  */
 519
 520 void
 521 ui_out_field_skip (struct ui_out *uiout,
 522                    const char *fldname)
 523 {
 524   int fldno;
 525   int width;
 526   int align;
 527
 528   verify_field (uiout, &fldno, &width, &align);
 529
 530   uo_field_skip (uiout, fldno, width, align, fldname);
 531 }
 532
 533 void
 534 ui_out_field_string (struct ui_out *uiout,
 535                      const char *fldname,
 536                      const char *string)
 537 {
 538   int fldno;
 539   int width;
 540   int align;
 541
 542   verify_field (uiout, &fldno, &width, &align);
 543
 544   uo_field_string (uiout, fldno, width, align, fldname, string);
 545 }
 546
 547 /* VARARGS */
 548 void
 549 ui_out_field_fmt (struct ui_out *uiout,
 550                   const char *fldname,
 551                   const char *format, ...)
 552 {
 553   va_list args;
 554   int fldno;
 555   int width;
 556   int align;
 557
 558   /* Will not align, but has to call anyway.  */
 559   verify_field (uiout, &fldno, &width, &align);
 560
 561   va_start (args, format);
 562
 563   uo_field_fmt (uiout, fldno, width, align, fldname, format, args);
 564
 565   va_end (args);
 566 }
 567
 568 void
 569 ui_out_spaces (struct ui_out *uiout, int numspaces)
 570 {
 571   uo_spaces (uiout, numspaces);
 572 }
 573
 574 void
 575 ui_out_text (struct ui_out *uiout,
 576              const char *string)
 577 {
 578   uo_text (uiout, string);
 579 }
 580
 581 void
 582 ui_out_message (struct ui_out *uiout, int verbosity,
 583                 const char *format,...)
 584 {
 585   va_list args;
 586
 587   va_start (args, format);
 588   uo_message (uiout, verbosity, format, args);
 589   va_end (args);
 590 }
 591
 592 void
 593 ui_out_wrap_hint (struct ui_out *uiout, char *identstring)
 594 {
 595   uo_wrap_hint (uiout, identstring);
 596 }
 597
 598 void
 599 ui_out_flush (struct ui_out *uiout)
 600 {
 601   uo_flush (uiout);
 602 }
 603
 604 int
 605 ui_out_redirect (struct ui_out *uiout, struct ui_file *outstream)
 606 {
 607   return uo_redirect (uiout, outstream);
 608 }
 609
 610 /* Set the flags specified by the mask given.  */
 611 int
 612 ui_out_set_flags (struct ui_out *uiout, int mask)
 613 {
 614   int oldflags = uiout->flags;
 615
 616   uiout->flags |= mask;
 617   return oldflags;
 618 }
 619
 620 /* Clear the flags specified by the mask given.  */
 621 int
 622 ui_out_clear_flags (struct ui_out *uiout, int mask)
 623 {
 624   int oldflags = uiout->flags;
 625
 626   uiout->flags &= ~mask;
 627   return oldflags;
 628 }
 629
 630 /* Test the flags against the mask given.  */
 631 int
 632 ui_out_test_flags (struct ui_out *uiout, int mask)
 633 {
 634   return (uiout->flags & mask);
 635 }
 636
 637 /* Obtain the current verbosity level (as stablished by the
 638    'set verbositylevel' command.  */
 639
 640 int
 641 ui_out_get_verblvl (struct ui_out *uiout)
 642 {
 643   /* FIXME: not implemented yet.  */
 644   return 0;
 645 }
 646
 647 int
 648 ui_out_is_mi_like_p (struct ui_out *uiout)
 649 {
 650   return uiout->impl->is_mi_like_p;
 651 }
 652
 653 /* Default gdb-out hook functions.  */
 654
 655 static void
 656 default_table_begin (struct ui_out *uiout, int nbrofcols,
 657                      int nr_rows,
 658                      const char *tblid)
 659 {
 660 }
 661
 662 static void
 663 default_table_body (struct ui_out *uiout)
 664 {
 665 }
 666
 667 static void
 668 default_table_end (struct ui_out *uiout)
 669 {
 670 }
 671
 672 static void
 673 default_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 674                       const char *col_name,
 675                       const char *colhdr)
 676 {
 677 }
 678
 679 static void
 680 default_begin (struct ui_out *uiout,
 681                enum ui_out_type type,
 682                int level,
 683                const char *id)
 684 {
 685 }
 686
 687 static void
 688 default_end (struct ui_out *uiout,
 689              enum ui_out_type type,
 690              int level)
 691 {
 692 }
 693
 694 static void
 695 default_field_int (struct ui_out *uiout, int fldno, int width,
 696                    enum ui_align align,
 697                    const char *fldname, int value)
 698 {
 699 }
 700
 701 static void
 702 default_field_skip (struct ui_out *uiout, int fldno, int width,
 703                     enum ui_align align, const char *fldname)
 704 {
 705 }
 706
 707 static void
 708 default_field_string (struct ui_out *uiout,
 709                       int fldno,
 710                       int width,
 711                       enum ui_align align,
 712                       const char *fldname,
 713                       const char *string)
 714 {
 715 }
 716
 717 static void
 718 default_field_fmt (struct ui_out *uiout, int fldno, int width,
 719                    enum ui_align align,
 720                    const char *fldname,
 721                    const char *format,
 722                    va_list args)
 723 {
 724 }
 725
 726 static void
 727 default_spaces (struct ui_out *uiout, int numspaces)
 728 {
 729 }
 730
 731 static void
 732 default_text (struct ui_out *uiout, const char *string)
 733 {
 734 }
 735
 736 static void
 737 default_message (struct ui_out *uiout, int verbosity,
 738                  const char *format,
 739                  va_list args)
 740 {
 741 }
 742
 743 static void
 744 default_wrap_hint (struct ui_out *uiout, char *identstring)
 745 {
 746 }
 747
 748 static void
 749 default_flush (struct ui_out *uiout)
 750 {
 751 }
 752
 753 static void
 754 default_data_destroy (struct ui_out *uiout)
 755 {
 756 }
 757
 758 /* Interface to the implementation functions.  */
 759
 760 void
 761 uo_table_begin (struct ui_out *uiout, int nbrofcols,
 762                 int nr_rows,
 763                 const char *tblid)
 764 {
 765   if (!uiout->impl->table_begin)
 766     return;
 767   uiout->impl->table_begin (uiout, nbrofcols, nr_rows, tblid);
 768 }
 769
 770 void
 771 uo_table_body (struct ui_out *uiout)
 772 {
 773   if (!uiout->impl->table_body)
 774     return;
 775   uiout->impl->table_body (uiout);
 776 }
 777
 778 void
 779 uo_table_end (struct ui_out *uiout)
 780 {
 781   if (!uiout->impl->table_end)
 782     return;
 783   uiout->impl->table_end (uiout);
 784 }
 785
 786 void
 787 uo_table_header (struct ui_out *uiout, int width, enum ui_align align,
 788                  const char *col_name,
 789                  const char *colhdr)
 790 {
 791   if (!uiout->impl->table_header)
 792     return;
 793   uiout->impl->table_header (uiout, width, align, col_name, colhdr);
 794 }
 795
 796 /* Clear the table associated with UIOUT.  */
 797
 798 static void
 799 clear_table (struct ui_out *uiout)
 800 {
 801   if (uiout->table.id)
 802     xfree (uiout->table.id);
 803   clear_header_list (uiout);
 804 }
 805
 806 void
 807 uo_begin (struct ui_out *uiout,
 808           enum ui_out_type type,
 809           int level,
 810           const char *id)
 811 {
 812   if (uiout->impl->begin == NULL)
 813     return;
 814   uiout->impl->begin (uiout, type, level, id);
 815 }
 816
 817 void
 818 uo_end (struct ui_out *uiout,
 819         enum ui_out_type type,
 820         int level)
 821 {
 822   if (uiout->impl->end == NULL)
 823     return;
 824   uiout->impl->end (uiout, type, level);
 825 }
 826
 827 void
 828 uo_field_int (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 829               const char *fldname,
 830               int value)
 831 {
 832   if (!uiout->impl->field_int)
 833     return;
 834   uiout->impl->field_int (uiout, fldno, width, align, fldname, value);
 835 }
 836
 837 void
 838 uo_field_skip (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 839                const char *fldname)
 840 {
 841   if (!uiout->impl->field_skip)
 842     return;
 843   uiout->impl->field_skip (uiout, fldno, width, align, fldname);
 844 }
 845
 846 void
 847 uo_field_string (struct ui_out *uiout, int fldno, int width,
 848                  enum ui_align align,
 849                  const char *fldname,
 850                  const char *string)
 851 {
 852   if (!uiout->impl->field_string)
 853     return;
 854   uiout->impl->field_string (uiout, fldno, width, align, fldname, string);
 855 }
 856
 857 void
 858 uo_field_fmt (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 859               const char *fldname,
 860               const char *format,
 861               va_list args)
 862 {
 863   if (!uiout->impl->field_fmt)
 864     return;
 865   uiout->impl->field_fmt (uiout, fldno, width, align, fldname, format, args);
 866 }
 867
 868 void
 869 uo_spaces (struct ui_out *uiout, int numspaces)
 870 {
 871   if (!uiout->impl->spaces)
 872     return;
 873   uiout->impl->spaces (uiout, numspaces);
 874 }
 875
 876 void
 877 uo_text (struct ui_out *uiout,
 878          const char *string)
 879 {
 880   if (!uiout->impl->text)
 881     return;
 882   uiout->impl->text (uiout, string);
 883 }
 884
 885 void
 886 uo_message (struct ui_out *uiout, int verbosity,
 887             const char *format,
 888             va_list args)
 889 {
 890   if (!uiout->impl->message)
 891     return;
 892   uiout->impl->message (uiout, verbosity, format, args);
 893 }
 894
 895 void
 896 uo_wrap_hint (struct ui_out *uiout, char *identstring)
 897 {
 898   if (!uiout->impl->wrap_hint)
 899     return;
 900   uiout->impl->wrap_hint (uiout, identstring);
 901 }
 902
 903 void
 904 uo_flush (struct ui_out *uiout)
 905 {
 906   if (!uiout->impl->flush)
 907     return;
 908   uiout->impl->flush (uiout);
 909 }
 910
 911 int
 912 uo_redirect (struct ui_out *uiout, struct ui_file *outstream)
 913 {
 914   if (!uiout->impl->redirect)
 915     return -1;
 916   uiout->impl->redirect (uiout, outstream);
 917   return 0;
 918 }
 919
 920 void
 921 uo_data_destroy (struct ui_out *uiout)
 922 {
 923   if (!uiout->impl->data_destroy)
 924     return;
 925
 926   uiout->impl->data_destroy (uiout);
 927 }
 928
 929 /* local functions */
 930
 931 /* List of column headers manipulation routines.  */
 932
 933 static void
 934 clear_header_list (struct ui_out *uiout)
 935 {
 936   while (uiout->table.header_first != NULL)
 937     {
 938       uiout->table.header_next = uiout->table.header_first;
 939       uiout->table.header_first = uiout->table.header_first->next;
 940       xfree (uiout->table.header_next->colhdr);
 941       xfree (uiout->table.header_next->col_name);
 942       xfree (uiout->table.header_next);
 943     }
 944   gdb_assert (uiout->table.header_first == NULL);
 945   uiout->table.header_last = NULL;
 946   uiout->table.header_next = NULL;
 947 }
 948
 949 static void
 950 append_header_to_list (struct ui_out *uiout,
 951                        int width,
 952                        int alignment,
 953                        const char *col_name,
 954                        const char *colhdr)
 955 {
 956   struct ui_out_hdr *temphdr;
 957
 958   temphdr = XMALLOC (struct ui_out_hdr);
 959   temphdr->width = width;
 960   temphdr->alignment = alignment;
 961   /* We have to copy the column title as the original may be an
 962      automatic.  */
 963   if (colhdr != NULL)
 964     temphdr->colhdr = xstrdup (colhdr);
 965   else
 966     temphdr->colhdr = NULL;
 967
 968   if (col_name != NULL)
 969     temphdr->col_name = xstrdup (col_name);
 970   else if (colhdr != NULL)
 971     temphdr->col_name = xstrdup (colhdr);
 972   else
 973     temphdr->col_name = NULL;
 974
 975   temphdr->next = NULL;
 976   if (uiout->table.header_first == NULL)
 977     {
 978       temphdr->colno = 1;
 979       uiout->table.header_first = temphdr;
 980       uiout->table.header_last = temphdr;
 981     }
 982   else
 983     {
 984       temphdr->colno = uiout->table.header_last->colno + 1;
 985       uiout->table.header_last->next = temphdr;
 986       uiout->table.header_last = temphdr;
 987     }
 988   uiout->table.header_next = uiout->table.header_last;
 989 }
 990
 991 /* Extract the format information for the NEXT header and advance
 992    the header pointer.  Return 0 if there was no next header.  */
 993
 994 static int
 995 get_next_header (struct ui_out *uiout,
 996                  int *colno,
 997                  int *width,
 998                  int *alignment,
 999                  char **colhdr)
1000 {
1001   /* There may be no headers at all or we may have used all columns.  */
1002   if (uiout->table.header_next == NULL)
1003     return 0;
1004   *colno = uiout->table.header_next->colno;
1005   *width = uiout->table.header_next->width;
1006   *alignment = uiout->table.header_next->alignment;
1007   *colhdr = uiout->table.header_next->colhdr;
1008   /* Advance the header pointer to the next entry.  */
1009   uiout->table.header_next = uiout->table.header_next->next;
1010   return 1;
1011 }
1012
1013
1014 /* Verify that the field/tuple/list is correctly positioned.  Return
1015    the field number and corresponding alignment (if
1016    available/applicable).  */
1017
1018 static void
1019 verify_field (struct ui_out *uiout, int *fldno, int *width, int *align)
1020 {
1021   struct ui_out_level *current = current_level (uiout);
1022   char *text;
1023
1024   if (uiout->table.flag)
1025     {
1026       if (!uiout->table.body_flag)
1027         internal_error (__FILE__, __LINE__,
1028                         _("table_body missing; table fields must be \
1029 specified after table_body and inside a list."));
1030       /* NOTE: cagney/2001-12-08: There was a check here to ensure
1031          that this code was only executed when uiout->level was
1032          greater than zero.  That no longer applies - this code is run
1033          before each table row tuple is started and at that point the
1034          level is zero.  */
1035     }
1036
1037   current->field_count += 1;
1038
1039   if (uiout->table.body_flag
1040       && uiout->table.entry_level == uiout->level
1041       && get_next_header (uiout, fldno, width, align, &text))
1042     {
1043       if (*fldno != current->field_count)
1044         internal_error (__FILE__, __LINE__,
1045                         _("ui-out internal error in handling headers."));
1046     }
1047   else
1048     {
1049       *width = 0;
1050       *align = ui_noalign;
1051       *fldno = current->field_count;
1052     }
1053 }
1054
1055
1056 /* Access to ui-out members data.  */
1057
1058 void *
1059 ui_out_data (struct ui_out *uiout)
1060 {
1061   return uiout->data;
1062 }
1063
1064 /* Access table field parameters.  */
1065 int
1066 ui_out_query_field (struct ui_out *uiout, int colno,
1067                     int *width, int *alignment, char **col_name)
1068 {
1069   struct ui_out_hdr *hdr;
1070
1071   if (!uiout->table.flag)
1072     return 0;
1073
1074   for (hdr = uiout->table.header_first; hdr; hdr = hdr->next)
1075     if (hdr->colno == colno)
1076       {
1077         *width = hdr->width;
1078         *alignment = hdr->alignment;
1079         *col_name = hdr->col_name;
1080         return 1;
1081       }
1082
1083   return 0;
1084 }
1085
1086 /* Initalize private members at startup.  */
1087
1088 struct ui_out *
1089 ui_out_new (struct ui_out_impl *impl, void *data,
1090             int flags)
1091 {
1092   struct ui_out *uiout = XMALLOC (struct ui_out);
1093
1094   uiout->data = data;
1095   uiout->impl = impl;
1096   uiout->flags = flags;
1097   uiout->table.flag = 0;
1098   uiout->table.body_flag = 0;
1099   uiout->level = 0;
1100   memset (uiout->levels, 0, sizeof (uiout->levels));
1101   uiout->table.header_first = NULL;
1102   uiout->table.header_last = NULL;
1103   uiout->table.header_next = NULL;
1104   return uiout;
1105 }
1106
1107 /* Free  UIOUT and the memory areas it references.  */
1108
1109 void
1110 ui_out_destroy (struct ui_out *uiout)
1111 {
1112   uo_data_destroy (uiout);
1113   clear_table (uiout);
1114   xfree (uiout);
1115 }
1116
1117 /* Standard gdb initialization hook.  */
1118
1119 void
1120 _initialize_ui_out (void)
1121 {
1122   /* nothing needs to be done */
1123 }