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 #include <memory>
  32
  33 /* A header of a ui_out_table.  */
  34
  35 class ui_out_hdr
  36 {
  37  public:
  38
  39   explicit ui_out_hdr (int number, int min_width, ui_align alignment,
  40                        const std::string &name, const std::string &header)
  41   : m_number (number),
  42     m_min_width (min_width),
  43     m_alignment (alignment),
  44     m_name (name),
  45     m_header (header)
  46   {
  47   }
  48
  49   int number () const
  50   {
  51     return m_number;
  52   }
  53
  54   int min_width () const
  55   {
  56     return m_min_width;
  57   }
  58
  59   ui_align alignment () const
  60   {
  61     return m_alignment;
  62   }
  63
  64   const std::string &header () const
  65   {
  66     return m_header;
  67   }
  68
  69   const std::string &name () const
  70   {
  71     return m_name;
  72   }
  73
  74  private:
  75
  76   /* The number of the table column this header represents, 1-based.  */
  77   int m_number;
  78
  79   /* Minimal column width in characters.  May or may not be applicable,
  80      depending on the actual implementation of ui_out.  */
  81   int m_min_width;
  82
  83   /* Alignment of the content in the column.  May or may not be applicable,
  84      depending on the actual implementation of ui_out.  */
  85   ui_align m_alignment;
  86
  87   /* Internal column name, used to internally refer to the column.  */
  88   std::string m_name;
  89
  90   /* Printed header text of the column.  */
  91   std::string m_header;
  92 };
  93
  94 /* A level of nesting (either a list or a tuple) in a ui_out output.  */
  95
  96 class ui_out_level
  97 {
  98  public:
  99
 100   explicit ui_out_level (ui_out_type type)
 101   : m_type (type),
 102     m_field_count (0)
 103   {
 104   }
 105
 106   ui_out_type type () const
 107   {
 108     return m_type;
 109   }
 110
 111   int field_count () const
 112   {
 113     return m_field_count;
 114   }
 115
 116   void inc_field_count ()
 117   {
 118     m_field_count++;
 119   }
 120
 121  private:
 122
 123   /* The type of this level.  */
 124   ui_out_type m_type;
 125
 126   /* Count each field; the first element is for non-list fields.  */
 127   int m_field_count;
 128 };
 129
 130 /* Tables are special.  Maintain a separate structure that tracks
 131    their state.  At present an output can only contain a single table
 132    but that restriction might eventually be lifted.  */
 133
 134 class ui_out_table
 135 {
 136  public:
 137
 138   /* States (steps) of a table generation.  */
 139
 140   enum class state
 141   {
 142     /* We are generating the table headers.  */
 143     HEADERS,
 144
 145     /* We are generating the table body.  */
 146     BODY,
 147   };
 148
 149   explicit ui_out_table (int entry_level, int nr_cols, const std::string &id)
 150   : m_state (state::HEADERS),
 151     m_entry_level (entry_level),
 152     m_nr_cols (nr_cols),
 153     m_id (id)
 154   {
 155   }
 156
 157   /* Start building the body of the table.  */
 158
 159   void start_body ();
 160
 161   /* Add a new header to the table.  */
 162
 163   void append_header (int width, ui_align alignment,
 164                       const std::string &col_name, const std::string &col_hdr);
 165
 166   void start_row ();
 167
 168   /* Extract the format information for the next header and advance
 169      the header iterator.  Return false if there was no next header.  */
 170
 171   bool get_next_header (int *colno, int *width, ui_align *alignment,
 172                        const char **col_hdr);
 173
 174   bool query_field (int colno, int *width, int *alignment,
 175                     const char **col_name) const;
 176
 177   state current_state () const;
 178
 179   int entry_level () const;
 180
 181  private:
 182
 183   state m_state;
 184
 185   /* The level at which each entry of the table is to be found.  A row
 186      (a tuple) is made up of entries.  Consequently ENTRY_LEVEL is one
 187      above that of the table.  */
 188   int m_entry_level;
 189
 190   /* Number of table columns (as specified in the table_begin call).  */
 191   int m_nr_cols;
 192
 193   /* String identifying the table (as specified in the table_begin
 194      call).  */
 195   std::string m_id;
 196
 197   /* Pointers to the column headers.  */
 198   std::vector<std::unique_ptr<ui_out_hdr>> m_headers;
 199
 200   /* Iterator over the headers vector, used when printing successive fields.  */
 201   std::vector<std::unique_ptr<ui_out_hdr>>::const_iterator m_headers_iterator;
 202 };
 203
 204 /* See ui-out.h.  */
 205
 206 void ui_out_table::start_body ()
 207 {
 208   if (m_state != state::HEADERS)
 209     internal_error (__FILE__, __LINE__,
 210                     _("extra table_body call not allowed; there must be only "
 211                       "one table_body after a table_begin and before a "
 212                       "table_end."));
 213
 214   /* Check if the number of defined headers matches the number of expected
 215      columns.  */
 216   if (m_headers.size () != m_nr_cols)
 217     internal_error (__FILE__, __LINE__,
 218                     _("number of headers differ from number of table "
 219                       "columns."));
 220
 221   m_state = state::BODY;
 222   m_headers_iterator = m_headers.begin ();
 223 }
 224
 225 /* See ui-out.h.  */
 226
 227 void ui_out_table::append_header (int width, ui_align alignment,
 228                                   const std::string &col_name,
 229                                   const std::string &col_hdr)
 230 {
 231   if (m_state != state::HEADERS)
 232     internal_error (__FILE__, __LINE__,
 233                     _("table header must be specified after table_begin and "
 234                       "before table_body."));
 235
 236   std::unique_ptr<ui_out_hdr> header (new ui_out_hdr (m_headers.size () + 1,
 237                                                         width, alignment,
 238                                                         col_name, col_hdr));
 239
 240   m_headers.push_back (std::move (header));
 241 }
 242
 243 /* See ui-out.h.  */
 244
 245 void ui_out_table::start_row ()
 246 {
 247   m_headers_iterator = m_headers.begin ();
 248 }
 249
 250 /* See ui-out.h.  */
 251
 252 bool ui_out_table::get_next_header (int *colno, int *width, ui_align *alignment,
 253                                     const char **col_hdr)
 254 {
 255   /* There may be no headers at all or we may have used all columns.  */
 256   if (m_headers_iterator == m_headers.end ())
 257     return false;
 258
 259   ui_out_hdr *hdr = m_headers_iterator->get ();
 260
 261   *colno = hdr->number ();
 262   *width = hdr->min_width ();
 263   *alignment = hdr->alignment ();
 264   *col_hdr = hdr->header ().c_str ();
 265
 266   /* Advance the header pointer to the next entry.  */
 267   m_headers_iterator++;
 268
 269   return true;
 270 }
 271
 272 /* See ui-out.h.  */
 273
 274 bool ui_out_table::query_field (int colno, int *width, int *alignment,
 275                                 const char **col_name) const
 276 {
 277   /* Column numbers are 1-based, so convert to 0-based index.  */
 278   int index = colno - 1;
 279
 280   if (index >= 0 && index < m_headers.size ())
 281     {
 282       ui_out_hdr *hdr = m_headers[index].get ();
 283
 284       gdb_assert (colno == hdr->number ());
 285
 286       *width = hdr->min_width ();
 287       *alignment = hdr->alignment ();
 288       *col_name = hdr->name ().c_str ();
 289
 290       return true;
 291     }
 292   else
 293     return false;
 294 }
 295
 296 /* See ui-out.h.  */
 297
 298 ui_out_table::state ui_out_table::current_state () const
 299 {
 300   return m_state;
 301 }
 302
 303 /* See ui-out.h.  */
 304
 305 int ui_out_table::entry_level () const
 306 {
 307   return m_entry_level;
 308 }
 309
 310 int
 311 ui_out::level () const
 312 {
 313   return m_levels.size ();
 314 }
 315
 316 /* The current (inner most) level.  */
 317
 318 ui_out_level *
 319 ui_out::current_level () const
 320 {
 321   return m_levels.back ().get ();
 322 }
 323
 324 /* Create a new level, of TYPE.  */
 325 void
 326 ui_out::push_level (ui_out_type type)
 327 {
 328   std::unique_ptr<ui_out_level> level (new ui_out_level (type));
 329
 330   m_levels.push_back (std::move (level));
 331 }
 332
 333 /* Discard the current level.  TYPE is the type of the level being
 334    discarded.  */
 335 void
 336 ui_out::pop_level (ui_out_type type)
 337 {
 338   /* We had better not underflow the buffer.  */
 339   gdb_assert (m_levels.size () > 0);
 340   gdb_assert (current_level ()->type () == type);
 341
 342   m_levels.pop_back ();
 343 }
 344
 345 /* Mark beginning of a table.  */
 346
 347 void
 348 ui_out::table_begin (int nr_cols, int nr_rows, const std::string &tblid)
 349 {
 350   if (m_table_up != nullptr)
 351     internal_error (__FILE__, __LINE__,
 352                     _("tables cannot be nested; table_begin found before \
 353 previous table_end."));
 354
 355   m_table_up.reset (new ui_out_table (level () + 1, nr_cols, tblid));
 356
 357   do_table_begin (nr_cols, nr_rows, tblid.c_str ());
 358 }
 359
 360 void
 361 ui_out::table_header (int width, ui_align alignment,
 362                       const std::string &col_name, const std::string &col_hdr)
 363 {
 364   if (m_table_up == nullptr)
 365     internal_error (__FILE__, __LINE__,
 366                     _("table_header outside a table is not valid; it must be \
 367 after a table_begin and before a table_body."));
 368
 369   m_table_up->append_header (width, alignment, col_name, col_hdr);
 370
 371   do_table_header (width, alignment, col_name, col_hdr);
 372 }
 373
 374 void
 375 ui_out::table_body ()
 376 {
 377   if (m_table_up == nullptr)
 378     internal_error (__FILE__, __LINE__,
 379                     _("table_body outside a table is not valid; it must be "
 380                       "after a table_begin and before a table_end."));
 381
 382   m_table_up->start_body ();
 383
 384   do_table_body ();
 385 }
 386
 387 void
 388 ui_out::table_end ()
 389 {
 390   if (m_table_up == nullptr)
 391     internal_error (__FILE__, __LINE__,
 392                     _("misplaced table_end or missing table_begin."));
 393
 394   do_table_end ();
 395
 396   m_table_up = nullptr;
 397 }
 398
 399 static void
 400 do_cleanup_table_end (void *data)
 401 {
 402   ui_out *uiout = (ui_out *) data;
 403
 404   uiout->table_end ();
 405 }
 406
 407 struct cleanup *
 408 make_cleanup_ui_out_table_begin_end (ui_out *uiout, int nr_cols, int nr_rows,
 409                                      const char *tblid)
 410 {
 411   uiout->table_begin (nr_cols, nr_rows, tblid);
 412   return make_cleanup (do_cleanup_table_end, uiout);
 413 }
 414
 415 void
 416 ui_out::begin (ui_out_type type, const char *id)
 417 {
 418   /* Be careful to verify the ``field'' before the new tuple/list is
 419      pushed onto the stack.  That way the containing list/table/row is
 420      verified and not the newly created tuple/list.  This verification
 421      is needed (at least) for the case where a table row entry
 422      contains either a tuple/list.  For that case bookkeeping such as
 423      updating the column count or advancing to the next heading still
 424      needs to be performed.  */
 425   {
 426     int fldno;
 427     int width;
 428     ui_align align;
 429
 430     verify_field (&fldno, &width, &align);
 431   }
 432
 433   push_level (type);
 434
 435   /* If the push puts us at the same level as a table row entry, we've
 436      got a new table row.  Put the header pointer back to the start.  */
 437   if (m_table_up != nullptr
 438       && m_table_up->current_state () == ui_out_table::state::BODY
 439       && m_table_up->entry_level () == level ())
 440     m_table_up->start_row ();
 441
 442   do_begin (type, id);
 443 }
 444
 445 void
 446 ui_out::end (ui_out_type type)
 447 {
 448   pop_level (type);
 449
 450   do_end (type);
 451 }
 452
 453 struct ui_out_end_cleanup_data
 454 {
 455   struct ui_out *uiout;
 456   enum ui_out_type type;
 457 };
 458
 459 static void
 460 do_cleanup_end (void *data)
 461 {
 462   struct ui_out_end_cleanup_data *end_cleanup_data
 463     = (struct ui_out_end_cleanup_data *) data;
 464
 465   end_cleanup_data->uiout->end (end_cleanup_data->type);
 466   xfree (end_cleanup_data);
 467 }
 468
 469 static struct cleanup *
 470 make_cleanup_ui_out_end (struct ui_out *uiout,
 471                          enum ui_out_type type)
 472 {
 473   struct ui_out_end_cleanup_data *end_cleanup_data;
 474
 475   end_cleanup_data = XNEW (struct ui_out_end_cleanup_data);
 476   end_cleanup_data->uiout = uiout;
 477   end_cleanup_data->type = type;
 478   return make_cleanup (do_cleanup_end, end_cleanup_data);
 479 }
 480
 481 struct cleanup *
 482 make_cleanup_ui_out_tuple_begin_end (struct ui_out *uiout,
 483                                      const char *id)
 484 {
 485   uiout->begin (ui_out_type_tuple, id);
 486   return make_cleanup_ui_out_end (uiout, ui_out_type_tuple);
 487 }
 488
 489 struct cleanup *
 490 make_cleanup_ui_out_list_begin_end (struct ui_out *uiout,
 491                                     const char *id)
 492 {
 493   uiout->begin (ui_out_type_list, id);
 494   return make_cleanup_ui_out_end (uiout, ui_out_type_list);
 495 }
 496
 497 void
 498 ui_out::field_int (const char *fldname, int value)
 499 {
 500   int fldno;
 501   int width;
 502   ui_align align;
 503
 504   verify_field (&fldno, &width, &align);
 505
 506   do_field_int (fldno, width, align, fldname, value);
 507 }
 508
 509 void
 510 ui_out::field_fmt_int (int input_width, ui_align input_align,
 511                        const char *fldname, int value)
 512 {
 513   int fldno;
 514   int width;
 515   ui_align align;
 516
 517   verify_field (&fldno, &width, &align);
 518
 519   do_field_int (fldno, input_width, input_align, fldname, value);
 520 }
 521
 522 /* Documented in ui-out.h.  */
 523
 524 void
 525 ui_out::field_core_addr (const char *fldname, struct gdbarch *gdbarch,
 526                          CORE_ADDR address)
 527 {
 528   field_string (fldname, print_core_address (gdbarch, address));
 529 }
 530
 531 void
 532 ui_out::field_stream (const char *fldname, ui_file *stream)
 533 {
 534   std::string buffer = ui_file_as_string (stream);
 535
 536   if (!buffer.empty ())
 537     field_string (fldname, buffer.c_str ());
 538   else
 539     field_skip (fldname);
 540   ui_file_rewind (stream);
 541 }
 542
 543 /* Used to omit a field.  */
 544
 545 void
 546 ui_out::field_skip (const char *fldname)
 547 {
 548   int fldno;
 549   int width;
 550   ui_align align;
 551
 552   verify_field (&fldno, &width, &align);
 553
 554   do_field_skip (fldno, width, align, fldname);
 555 }
 556
 557 void
 558 ui_out::field_string (const char *fldname, const char *string)
 559 {
 560   int fldno;
 561   int width;
 562   ui_align align;
 563
 564   verify_field (&fldno, &width, &align);
 565
 566   do_field_string (fldno, width, align, fldname, string);
 567 }
 568
 569 /* VARARGS */
 570 void
 571 ui_out::field_fmt (const char *fldname, const char *format, ...)
 572 {
 573   va_list args;
 574   int fldno;
 575   int width;
 576   ui_align align;
 577
 578   /* Will not align, but has to call anyway.  */
 579   verify_field (&fldno, &width, &align);
 580
 581   va_start (args, format);
 582
 583   do_field_fmt (fldno, width, align, fldname, format, args);
 584
 585   va_end (args);
 586 }
 587
 588 void
 589 ui_out::spaces (int numspaces)
 590 {
 591   do_spaces (numspaces);
 592 }
 593
 594 void
 595 ui_out::text (const char *string)
 596 {
 597   do_text (string);
 598 }
 599
 600 void
 601 ui_out::message (const char *format, ...)
 602 {
 603   va_list args;
 604
 605   va_start (args, format);
 606   do_message (format, args);
 607   va_end (args);
 608 }
 609
 610 void
 611 ui_out::wrap_hint (const char *identstring)
 612 {
 613   do_wrap_hint (identstring);
 614 }
 615
 616 void
 617 ui_out::flush ()
 618 {
 619   do_flush ();
 620 }
 621
 622 int
 623 ui_out::redirect (ui_file *outstream)
 624 {
 625   return do_redirect (outstream);
 626 }
 627
 628 /* Test the flags against the mask given.  */
 629 ui_out_flags
 630 ui_out::test_flags (ui_out_flags mask)
 631 {
 632   return m_flags & mask;
 633 }
 634
 635 bool
 636 ui_out::is_mi_like_p ()
 637 {
 638   return do_is_mi_like_p ();
 639 }
 640
 641 /* Verify that the field/tuple/list is correctly positioned.  Return
 642    the field number and corresponding alignment (if
 643    available/applicable).  */
 644
 645 void
 646 ui_out::verify_field (int *fldno, int *width, ui_align *align)
 647 {
 648   ui_out_level *current = current_level ();
 649   const char *text;
 650
 651   if (m_table_up != nullptr
 652       && m_table_up->current_state () != ui_out_table::state::BODY)
 653     {
 654       internal_error (__FILE__, __LINE__,
 655                       _("table_body missing; table fields must be \
 656 specified after table_body and inside a list."));
 657     }
 658
 659   current->inc_field_count ();
 660
 661   if (m_table_up != nullptr
 662       && m_table_up->current_state () == ui_out_table::state::BODY
 663       && m_table_up->entry_level () == level ()
 664       && m_table_up->get_next_header (fldno, width, align, &text))
 665     {
 666       if (*fldno != current->field_count ())
 667         internal_error (__FILE__, __LINE__,
 668                         _("ui-out internal error in handling headers."));
 669     }
 670   else
 671     {
 672       *width = 0;
 673       *align = ui_noalign;
 674       *fldno = current->field_count ();
 675     }
 676 }
 677
 678 /* Access table field parameters.  */
 679
 680 bool
 681 ui_out::query_table_field (int colno, int *width, int *alignment,
 682                            const char **col_name)
 683 {
 684   if (m_table_up == nullptr)
 685     return false;
 686
 687   return m_table_up->query_field (colno, width, alignment, col_name);
 688 }
 689
 690 /* The constructor.  */
 691
 692 ui_out::ui_out (ui_out_flags flags)
 693 : m_flags (flags)
 694 {
 695   /* Create the ui-out level #1, the default level.  */
 696   push_level (ui_out_type_tuple);
 697 }
 698
 699 ui_out::~ui_out ()
 700 {
 701 }