gdb/ui-out.c

   1 /* Output generating routines for GDB.
   2
   3    Copyright (C) 1999-2019 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 #include "gdbsupport/format.h"
  28 #include "cli/cli-style.h"
  29
  30 #include <vector>
  31 #include <memory>
  32 #include <string>
  33
  34 namespace {
  35
  36 /* A header of a ui_out_table.  */
  37
  38 class ui_out_hdr
  39 {
  40  public:
  41
  42   explicit ui_out_hdr (int number, int min_width, ui_align alignment,
  43                        const std::string &name, const std::string &header)
  44   : m_number (number),
  45     m_min_width (min_width),
  46     m_alignment (alignment),
  47     m_name (name),
  48     m_header (header)
  49   {
  50   }
  51
  52   int number () const
  53   {
  54     return m_number;
  55   }
  56
  57   int min_width () const
  58   {
  59     return m_min_width;
  60   }
  61
  62   ui_align alignment () const
  63   {
  64     return m_alignment;
  65   }
  66
  67   const std::string &header () const
  68   {
  69     return m_header;
  70   }
  71
  72   const std::string &name () const
  73   {
  74     return m_name;
  75   }
  76
  77  private:
  78
  79   /* The number of the table column this header represents, 1-based.  */
  80   int m_number;
  81
  82   /* Minimal column width in characters.  May or may not be applicable,
  83      depending on the actual implementation of ui_out.  */
  84   int m_min_width;
  85
  86   /* Alignment of the content in the column.  May or may not be applicable,
  87      depending on the actual implementation of ui_out.  */
  88   ui_align m_alignment;
  89
  90   /* Internal column name, used to internally refer to the column.  */
  91   std::string m_name;
  92
  93   /* Printed header text of the column.  */
  94   std::string m_header;
  95 };
  96
  97 } // namespace
  98
  99 /* A level of nesting (either a list or a tuple) in a ui_out output.  */
 100
 101 class ui_out_level
 102 {
 103  public:
 104
 105   explicit ui_out_level (ui_out_type type)
 106   : m_type (type),
 107     m_field_count (0)
 108   {
 109   }
 110
 111   ui_out_type type () const
 112   {
 113     return m_type;
 114   }
 115
 116   int field_count () const
 117   {
 118     return m_field_count;
 119   }
 120
 121   void inc_field_count ()
 122   {
 123     m_field_count++;
 124   }
 125
 126  private:
 127
 128   /* The type of this level.  */
 129   ui_out_type m_type;
 130
 131   /* Count each field; the first element is for non-list fields.  */
 132   int m_field_count;
 133 };
 134
 135 /* Tables are special.  Maintain a separate structure that tracks
 136    their state.  At present an output can only contain a single table
 137    but that restriction might eventually be lifted.  */
 138
 139 class ui_out_table
 140 {
 141  public:
 142
 143   /* States (steps) of a table generation.  */
 144
 145   enum class state
 146   {
 147     /* We are generating the table headers.  */
 148     HEADERS,
 149
 150     /* We are generating the table body.  */
 151     BODY,
 152   };
 153
 154   explicit ui_out_table (int entry_level, int nr_cols, const std::string &id)
 155   : m_state (state::HEADERS),
 156     m_entry_level (entry_level),
 157     m_nr_cols (nr_cols),
 158     m_id (id)
 159   {
 160   }
 161
 162   /* Start building the body of the table.  */
 163
 164   void start_body ();
 165
 166   /* Add a new header to the table.  */
 167
 168   void append_header (int width, ui_align alignment,
 169                       const std::string &col_name, const std::string &col_hdr);
 170
 171   void start_row ();
 172
 173   /* Extract the format information for the next header and advance
 174      the header iterator.  Return false if there was no next header.  */
 175
 176   bool get_next_header (int *colno, int *width, ui_align *alignment,
 177                        const char **col_hdr);
 178
 179   bool query_field (int colno, int *width, int *alignment,
 180                     const char **col_name) const;
 181
 182   state current_state () const;
 183
 184   int entry_level () const;
 185
 186  private:
 187
 188   state m_state;
 189
 190   /* The level at which each entry of the table is to be found.  A row
 191      (a tuple) is made up of entries.  Consequently ENTRY_LEVEL is one
 192      above that of the table.  */
 193   int m_entry_level;
 194
 195   /* Number of table columns (as specified in the table_begin call).  */
 196   int m_nr_cols;
 197
 198   /* String identifying the table (as specified in the table_begin
 199      call).  */
 200   std::string m_id;
 201
 202   /* Pointers to the column headers.  */
 203   std::vector<std::unique_ptr<ui_out_hdr>> m_headers;
 204
 205   /* Iterator over the headers vector, used when printing successive fields.  */
 206   std::vector<std::unique_ptr<ui_out_hdr>>::const_iterator m_headers_iterator;
 207 };
 208
 209 /* See ui-out.h.  */
 210
 211 void ui_out_table::start_body ()
 212 {
 213   if (m_state != state::HEADERS)
 214     internal_error (__FILE__, __LINE__,
 215                     _("extra table_body call not allowed; there must be only "
 216                       "one table_body after a table_begin and before a "
 217                       "table_end."));
 218
 219   /* Check if the number of defined headers matches the number of expected
 220      columns.  */
 221   if (m_headers.size () != m_nr_cols)
 222     internal_error (__FILE__, __LINE__,
 223                     _("number of headers differ from number of table "
 224                       "columns."));
 225
 226   m_state = state::BODY;
 227   m_headers_iterator = m_headers.begin ();
 228 }
 229
 230 /* See ui-out.h.  */
 231
 232 void ui_out_table::append_header (int width, ui_align alignment,
 233                                   const std::string &col_name,
 234                                   const std::string &col_hdr)
 235 {
 236   if (m_state != state::HEADERS)
 237     internal_error (__FILE__, __LINE__,
 238                     _("table header must be specified after table_begin and "
 239                       "before table_body."));
 240
 241   std::unique_ptr<ui_out_hdr> header (new ui_out_hdr (m_headers.size () + 1,
 242                                                         width, alignment,
 243                                                         col_name, col_hdr));
 244
 245   m_headers.push_back (std::move (header));
 246 }
 247
 248 /* See ui-out.h.  */
 249
 250 void ui_out_table::start_row ()
 251 {
 252   m_headers_iterator = m_headers.begin ();
 253 }
 254
 255 /* See ui-out.h.  */
 256
 257 bool ui_out_table::get_next_header (int *colno, int *width, ui_align *alignment,
 258                                     const char **col_hdr)
 259 {
 260   /* There may be no headers at all or we may have used all columns.  */
 261   if (m_headers_iterator == m_headers.end ())
 262     return false;
 263
 264   ui_out_hdr *hdr = m_headers_iterator->get ();
 265
 266   *colno = hdr->number ();
 267   *width = hdr->min_width ();
 268   *alignment = hdr->alignment ();
 269   *col_hdr = hdr->header ().c_str ();
 270
 271   /* Advance the header pointer to the next entry.  */
 272   m_headers_iterator++;
 273
 274   return true;
 275 }
 276
 277 /* See ui-out.h.  */
 278
 279 bool ui_out_table::query_field (int colno, int *width, int *alignment,
 280                                 const char **col_name) const
 281 {
 282   /* Column numbers are 1-based, so convert to 0-based index.  */
 283   int index = colno - 1;
 284
 285   if (index >= 0 && index < m_headers.size ())
 286     {
 287       ui_out_hdr *hdr = m_headers[index].get ();
 288
 289       gdb_assert (colno == hdr->number ());
 290
 291       *width = hdr->min_width ();
 292       *alignment = hdr->alignment ();
 293       *col_name = hdr->name ().c_str ();
 294
 295       return true;
 296     }
 297   else
 298     return false;
 299 }
 300
 301 /* See ui-out.h.  */
 302
 303 ui_out_table::state ui_out_table::current_state () const
 304 {
 305   return m_state;
 306 }
 307
 308 /* See ui-out.h.  */
 309
 310 int ui_out_table::entry_level () const
 311 {
 312   return m_entry_level;
 313 }
 314
 315 int
 316 ui_out::level () const
 317 {
 318   return m_levels.size ();
 319 }
 320
 321 /* The current (inner most) level.  */
 322
 323 ui_out_level *
 324 ui_out::current_level () const
 325 {
 326   return m_levels.back ().get ();
 327 }
 328
 329 /* Create a new level, of TYPE.  */
 330 void
 331 ui_out::push_level (ui_out_type type)
 332 {
 333   std::unique_ptr<ui_out_level> level (new ui_out_level (type));
 334
 335   m_levels.push_back (std::move (level));
 336 }
 337
 338 /* Discard the current level.  TYPE is the type of the level being
 339    discarded.  */
 340 void
 341 ui_out::pop_level (ui_out_type type)
 342 {
 343   /* We had better not underflow the buffer.  */
 344   gdb_assert (m_levels.size () > 0);
 345   gdb_assert (current_level ()->type () == type);
 346
 347   m_levels.pop_back ();
 348 }
 349
 350 /* Mark beginning of a table.  */
 351
 352 void
 353 ui_out::table_begin (int nr_cols, int nr_rows, const std::string &tblid)
 354 {
 355   if (m_table_up != nullptr)
 356     internal_error (__FILE__, __LINE__,
 357                     _("tables cannot be nested; table_begin found before \
 358 previous table_end."));
 359
 360   m_table_up.reset (new ui_out_table (level () + 1, nr_cols, tblid));
 361
 362   do_table_begin (nr_cols, nr_rows, tblid.c_str ());
 363 }
 364
 365 void
 366 ui_out::table_header (int width, ui_align alignment,
 367                       const std::string &col_name, const std::string &col_hdr)
 368 {
 369   if (m_table_up == nullptr)
 370     internal_error (__FILE__, __LINE__,
 371                     _("table_header outside a table is not valid; it must be \
 372 after a table_begin and before a table_body."));
 373
 374   m_table_up->append_header (width, alignment, col_name, col_hdr);
 375
 376   do_table_header (width, alignment, col_name, col_hdr);
 377 }
 378
 379 void
 380 ui_out::table_body ()
 381 {
 382   if (m_table_up == nullptr)
 383     internal_error (__FILE__, __LINE__,
 384                     _("table_body outside a table is not valid; it must be "
 385                       "after a table_begin and before a table_end."));
 386
 387   m_table_up->start_body ();
 388
 389   do_table_body ();
 390 }
 391
 392 void
 393 ui_out::table_end ()
 394 {
 395   if (m_table_up == nullptr)
 396     internal_error (__FILE__, __LINE__,
 397                     _("misplaced table_end or missing table_begin."));
 398
 399   do_table_end ();
 400
 401   m_table_up = nullptr;
 402 }
 403
 404 void
 405 ui_out::begin (ui_out_type type, const char *id)
 406 {
 407   /* Be careful to verify the ``field'' before the new tuple/list is
 408      pushed onto the stack.  That way the containing list/table/row is
 409      verified and not the newly created tuple/list.  This verification
 410      is needed (at least) for the case where a table row entry
 411      contains either a tuple/list.  For that case bookkeeping such as
 412      updating the column count or advancing to the next heading still
 413      needs to be performed.  */
 414   {
 415     int fldno;
 416     int width;
 417     ui_align align;
 418
 419     verify_field (&fldno, &width, &align);
 420   }
 421
 422   push_level (type);
 423
 424   /* If the push puts us at the same level as a table row entry, we've
 425      got a new table row.  Put the header pointer back to the start.  */
 426   if (m_table_up != nullptr
 427       && m_table_up->current_state () == ui_out_table::state::BODY
 428       && m_table_up->entry_level () == level ())
 429     m_table_up->start_row ();
 430
 431   do_begin (type, id);
 432 }
 433
 434 void
 435 ui_out::end (ui_out_type type)
 436 {
 437   pop_level (type);
 438
 439   do_end (type);
 440 }
 441
 442 void
 443 ui_out::field_signed (const char *fldname, LONGEST value)
 444 {
 445   int fldno;
 446   int width;
 447   ui_align align;
 448
 449   verify_field (&fldno, &width, &align);
 450
 451   do_field_signed (fldno, width, align, fldname, value);
 452 }
 453
 454 void
 455 ui_out::field_fmt_signed (int input_width, ui_align input_align,
 456                           const char *fldname, LONGEST value)
 457 {
 458   int fldno;
 459   int width;
 460   ui_align align;
 461
 462   verify_field (&fldno, &width, &align);
 463
 464   do_field_signed (fldno, input_width, input_align, fldname, value);
 465 }
 466
 467 /* See ui-out.h.  */
 468
 469 void
 470 ui_out::field_unsigned (const char *fldname, ULONGEST value)
 471 {
 472   int fldno;
 473   int width;
 474   ui_align align;
 475
 476   verify_field (&fldno, &width, &align);
 477
 478   do_field_unsigned (fldno, width, align, fldname, value);
 479 }
 480
 481 /* Documented in ui-out.h.  */
 482
 483 void
 484 ui_out::field_core_addr (const char *fldname, struct gdbarch *gdbarch,
 485                          CORE_ADDR address)
 486 {
 487   field_string (fldname, print_core_address (gdbarch, address),
 488                 address_style.style ());
 489 }
 490
 491 void
 492 ui_out::field_stream (const char *fldname, string_file &stream,
 493                       const ui_file_style &style)
 494 {
 495   if (!stream.empty ())
 496     field_string (fldname, stream.c_str (), style);
 497   else
 498     field_skip (fldname);
 499   stream.clear ();
 500 }
 501
 502 /* Used to omit a field.  */
 503
 504 void
 505 ui_out::field_skip (const char *fldname)
 506 {
 507   int fldno;
 508   int width;
 509   ui_align align;
 510
 511   verify_field (&fldno, &width, &align);
 512
 513   do_field_skip (fldno, width, align, fldname);
 514 }
 515
 516 void
 517 ui_out::field_string (const char *fldname, const char *string,
 518                       const ui_file_style &style)
 519 {
 520   int fldno;
 521   int width;
 522   ui_align align;
 523
 524   verify_field (&fldno, &width, &align);
 525
 526   do_field_string (fldno, width, align, fldname, string, style);
 527 }
 528
 529 void
 530 ui_out::field_string (const char *fldname, const std::string &string)
 531 {
 532   field_string (fldname, string.c_str ());
 533 }
 534
 535 /* VARARGS */
 536 void
 537 ui_out::field_fmt (const char *fldname, const char *format, ...)
 538 {
 539   va_list args;
 540   int fldno;
 541   int width;
 542   ui_align align;
 543
 544   verify_field (&fldno, &width, &align);
 545
 546   va_start (args, format);
 547
 548   do_field_fmt (fldno, width, align, fldname, format, args);
 549
 550   va_end (args);
 551 }
 552
 553 void
 554 ui_out::spaces (int numspaces)
 555 {
 556   do_spaces (numspaces);
 557 }
 558
 559 void
 560 ui_out::text (const char *string)
 561 {
 562   do_text (string);
 563 }
 564
 565 void
 566 ui_out::message (const char *format, ...)
 567 {
 568   va_list args;
 569
 570   va_start (args, format);
 571   do_message (format, args);
 572   va_end (args);
 573 }
 574
 575 void
 576 ui_out::wrap_hint (const char *identstring)
 577 {
 578   do_wrap_hint (identstring);
 579 }
 580
 581 void
 582 ui_out::flush ()
 583 {
 584   do_flush ();
 585 }
 586
 587 void
 588 ui_out::redirect (ui_file *outstream)
 589 {
 590   do_redirect (outstream);
 591 }
 592
 593 /* Test the flags against the mask given.  */
 594 ui_out_flags
 595 ui_out::test_flags (ui_out_flags mask)
 596 {
 597   return m_flags & mask;
 598 }
 599
 600 bool
 601 ui_out::is_mi_like_p () const
 602 {
 603   return do_is_mi_like_p ();
 604 }
 605
 606 /* Verify that the field/tuple/list is correctly positioned.  Return
 607    the field number and corresponding alignment (if
 608    available/applicable).  */
 609
 610 void
 611 ui_out::verify_field (int *fldno, int *width, ui_align *align)
 612 {
 613   ui_out_level *current = current_level ();
 614   const char *text;
 615
 616   if (m_table_up != nullptr
 617       && m_table_up->current_state () != ui_out_table::state::BODY)
 618     {
 619       internal_error (__FILE__, __LINE__,
 620                       _("table_body missing; table fields must be \
 621 specified after table_body and inside a list."));
 622     }
 623
 624   current->inc_field_count ();
 625
 626   if (m_table_up != nullptr
 627       && m_table_up->current_state () == ui_out_table::state::BODY
 628       && m_table_up->entry_level () == level ()
 629       && m_table_up->get_next_header (fldno, width, align, &text))
 630     {
 631       if (*fldno != current->field_count ())
 632         internal_error (__FILE__, __LINE__,
 633                         _("ui-out internal error in handling headers."));
 634     }
 635   else
 636     {
 637       *width = 0;
 638       *align = ui_noalign;
 639       *fldno = current->field_count ();
 640     }
 641 }
 642
 643 /* Access table field parameters.  */
 644
 645 bool
 646 ui_out::query_table_field (int colno, int *width, int *alignment,
 647                            const char **col_name)
 648 {
 649   if (m_table_up == nullptr)
 650     return false;
 651
 652   return m_table_up->query_field (colno, width, alignment, col_name);
 653 }
 654
 655 /* The constructor.  */
 656
 657 ui_out::ui_out (ui_out_flags flags)
 658 : m_flags (flags)
 659 {
 660   /* Create the ui-out level #1, the default level.  */
 661   push_level (ui_out_type_tuple);
 662 }
 663
 664 ui_out::~ui_out ()
 665 {
 666 }