gdb/tui/tui-layout.c

   1 /* TUI layout window management.
   2
   3    Copyright (C) 1998-2019 Free Software Foundation, Inc.
   4
   5    Contributed by Hewlett-Packard Company.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "arch-utils.h"
  24 #include "command.h"
  25 #include "symtab.h"
  26 #include "frame.h"
  27 #include "source.h"
  28 #include <ctype.h>
  29
  30 #include "tui/tui.h"
  31 #include "tui/tui-data.h"
  32 #include "tui/tui-windata.h"
  33 #include "tui/tui-wingeneral.h"
  34 #include "tui/tui-stack.h"
  35 #include "tui/tui-regs.h"
  36 #include "tui/tui-win.h"
  37 #include "tui/tui-winsource.h"
  38 #include "tui/tui-disasm.h"
  39 #include "tui/tui-layout.h"
  40 #include "gdb_curses.h"
  41
  42 /*******************************
  43 ** Static Local Decls
  44 ********************************/
  45 static void show_layout (enum tui_layout_type);
  46 static void show_source_or_disasm_and_command (enum tui_layout_type);
  47 static struct tui_win_info *make_command_window (int, int);
  48 static struct tui_win_info *make_source_window (int, int);
  49 static struct tui_win_info *make_disasm_window (int, int);
  50 static void show_source_command (void);
  51 static void show_disasm_command (void);
  52 static void show_source_disasm_command (void);
  53 static void show_data (enum tui_layout_type);
  54 static enum tui_layout_type next_layout (void);
  55 static enum tui_layout_type prev_layout (void);
  56 static void tui_layout_command (const char *, int);
  57 static void extract_display_start_addr (struct gdbarch **, CORE_ADDR *);
  58
  59
  60 /***************************************
  61 ** DEFINITIONS
  62 ***************************************/
  63
  64 #define LAYOUT_USAGE     "Usage: layout prev | next | <layout_name> \n"
  65
  66 /* Show the screen layout defined.  */
  67 static void
  68 show_layout (enum tui_layout_type layout)
  69 {
  70   enum tui_layout_type cur_layout = tui_current_layout ();
  71
  72   if (layout != cur_layout)
  73     {
  74       /* Since the new layout may cause changes in window size, we
  75          should free the content and reallocate on next display of
  76          source/asm.  */
  77       tui_clear_source_windows ();
  78       if (layout == SRC_DATA_COMMAND
  79           || layout == DISASSEM_DATA_COMMAND)
  80         {
  81           show_data (layout);
  82           tui_refresh_all ();
  83         }
  84       else
  85         {
  86           /* First make the current layout be invisible.  */
  87           tui_make_all_invisible ();
  88           tui_make_invisible (tui_locator_win_info_ptr ());
  89
  90           switch (layout)
  91             {
  92               /* Now show the new layout.  */
  93             case SRC_COMMAND:
  94               show_source_command ();
  95               tui_add_to_source_windows (TUI_SRC_WIN);
  96               break;
  97             case DISASSEM_COMMAND:
  98               show_disasm_command ();
  99               tui_add_to_source_windows (TUI_DISASM_WIN);
 100               break;
 101             case SRC_DISASSEM_COMMAND:
 102               show_source_disasm_command ();
 103               tui_add_to_source_windows (TUI_SRC_WIN);
 104               tui_add_to_source_windows (TUI_DISASM_WIN);
 105               break;
 106             default:
 107               break;
 108             }
 109         }
 110     }
 111 }
 112
 113
 114 /* Function to set the layout to SRC_COMMAND, DISASSEM_COMMAND,
 115    SRC_DISASSEM_COMMAND, SRC_DATA_COMMAND, or DISASSEM_DATA_COMMAND.  */
 116 void
 117 tui_set_layout (enum tui_layout_type layout_type)
 118 {
 119   gdb_assert (layout_type != UNDEFINED_LAYOUT);
 120
 121   enum tui_layout_type cur_layout = tui_current_layout ();
 122   struct gdbarch *gdbarch;
 123   CORE_ADDR addr;
 124   struct tui_win_info *win_with_focus = tui_win_with_focus ();
 125   struct tui_layout_def *layout_def = tui_layout_def ();
 126
 127   extract_display_start_addr (&gdbarch, &addr);
 128
 129   enum tui_layout_type new_layout = layout_type;
 130
 131   if (new_layout != cur_layout)
 132     {
 133       show_layout (new_layout);
 134
 135       /* Now determine where focus should be.  */
 136       if (win_with_focus != TUI_CMD_WIN)
 137         {
 138           switch (new_layout)
 139             {
 140             case SRC_COMMAND:
 141               tui_set_win_focus_to (TUI_SRC_WIN);
 142               layout_def->display_mode = SRC_WIN;
 143               break;
 144             case DISASSEM_COMMAND:
 145               /* The previous layout was not showing code.
 146                  This can happen if there is no source
 147                  available:
 148
 149                  1. if the source file is in another dir OR
 150                  2. if target was compiled without -g
 151                  We still want to show the assembly though!  */
 152
 153               tui_get_begin_asm_address (&gdbarch, &addr);
 154               tui_set_win_focus_to (TUI_DISASM_WIN);
 155               layout_def->display_mode = DISASSEM_WIN;
 156               break;
 157             case SRC_DISASSEM_COMMAND:
 158               /* The previous layout was not showing code.
 159                  This can happen if there is no source
 160                  available:
 161
 162                  1. if the source file is in another dir OR
 163                  2. if target was compiled without -g
 164                  We still want to show the assembly though!  */
 165
 166               tui_get_begin_asm_address (&gdbarch, &addr);
 167               if (win_with_focus == TUI_SRC_WIN)
 168                 tui_set_win_focus_to (TUI_SRC_WIN);
 169               else
 170                 tui_set_win_focus_to (TUI_DISASM_WIN);
 171               break;
 172             case SRC_DATA_COMMAND:
 173               if (win_with_focus != TUI_DATA_WIN)
 174                 tui_set_win_focus_to (TUI_SRC_WIN);
 175               else
 176                 tui_set_win_focus_to (TUI_DATA_WIN);
 177               layout_def->display_mode = SRC_WIN;
 178               break;
 179             case DISASSEM_DATA_COMMAND:
 180               /* The previous layout was not showing code.
 181                  This can happen if there is no source
 182                  available:
 183
 184                  1. if the source file is in another dir OR
 185                  2. if target was compiled without -g
 186                  We still want to show the assembly though!  */
 187
 188               tui_get_begin_asm_address (&gdbarch, &addr);
 189               if (win_with_focus != TUI_DATA_WIN)
 190                 tui_set_win_focus_to (TUI_DISASM_WIN);
 191               else
 192                 tui_set_win_focus_to (TUI_DATA_WIN);
 193               layout_def->display_mode = DISASSEM_WIN;
 194               break;
 195             default:
 196               break;
 197             }
 198         }
 199       /*
 200        * Now update the window content.
 201        */
 202       tui_update_source_windows_with_addr (gdbarch, addr);
 203       if (new_layout == SRC_DATA_COMMAND
 204           || new_layout == DISASSEM_DATA_COMMAND)
 205         tui_show_registers (TUI_DATA_WIN->current_group);
 206     }
 207 }
 208
 209 /* Add the specified window to the layout in a logical way.  This
 210    means setting up the most logical layout given the window to be
 211    added.  */
 212 void
 213 tui_add_win_to_layout (enum tui_win_type type)
 214 {
 215   enum tui_layout_type cur_layout = tui_current_layout ();
 216
 217   switch (type)
 218     {
 219     case SRC_WIN:
 220       if (cur_layout != SRC_COMMAND
 221           && cur_layout != SRC_DISASSEM_COMMAND
 222           && cur_layout != SRC_DATA_COMMAND)
 223         {
 224           tui_clear_source_windows_detail ();
 225           if (cur_layout == DISASSEM_DATA_COMMAND)
 226             show_layout (SRC_DATA_COMMAND);
 227           else
 228             show_layout (SRC_COMMAND);
 229         }
 230       break;
 231     case DISASSEM_WIN:
 232       if (cur_layout != DISASSEM_COMMAND
 233           && cur_layout != SRC_DISASSEM_COMMAND
 234           && cur_layout != DISASSEM_DATA_COMMAND)
 235         {
 236           tui_clear_source_windows_detail ();
 237           if (cur_layout == SRC_DATA_COMMAND)
 238             show_layout (DISASSEM_DATA_COMMAND);
 239           else
 240             show_layout (DISASSEM_COMMAND);
 241         }
 242       break;
 243     case DATA_WIN:
 244       if (cur_layout != SRC_DATA_COMMAND
 245           && cur_layout != DISASSEM_DATA_COMMAND)
 246         {
 247           if (cur_layout == DISASSEM_COMMAND)
 248             show_layout (DISASSEM_DATA_COMMAND);
 249           else
 250             show_layout (SRC_DATA_COMMAND);
 251         }
 252       break;
 253     default:
 254       break;
 255     }
 256 }
 257
 258
 259 /* Answer the height of a window.  If it hasn't been created yet,
 260    answer what the height of a window would be based upon its type and
 261    the layout.  */
 262 int
 263 tui_default_win_height (enum tui_win_type type,
 264                         enum tui_layout_type layout)
 265 {
 266   int h;
 267
 268   if (tui_win_list[type] != NULL)
 269     h = tui_win_list[type]->height;
 270   else
 271     {
 272       switch (layout)
 273         {
 274         case SRC_COMMAND:
 275         case DISASSEM_COMMAND:
 276           if (TUI_CMD_WIN == NULL)
 277             h = tui_term_height () / 2;
 278           else
 279             h = tui_term_height () - TUI_CMD_WIN->height;
 280           break;
 281         case SRC_DISASSEM_COMMAND:
 282         case SRC_DATA_COMMAND:
 283         case DISASSEM_DATA_COMMAND:
 284           if (TUI_CMD_WIN == NULL)
 285             h = tui_term_height () / 3;
 286           else
 287             h = (tui_term_height () - TUI_CMD_WIN->height) / 2;
 288           break;
 289         default:
 290           h = 0;
 291           break;
 292         }
 293     }
 294
 295   return h;
 296 }
 297
 298
 299 /* Answer the height of a window.  If it hasn't been created yet,
 300    answer what the height of a window would be based upon its type and
 301    the layout.  */
 302 int
 303 tui_default_win_viewport_height (enum tui_win_type type,
 304                                  enum tui_layout_type layout)
 305 {
 306   int h;
 307
 308   h = tui_default_win_height (type, layout);
 309
 310   if (tui_win_list[type] == TUI_CMD_WIN)
 311     h -= 1;
 312   else
 313     h -= 2;
 314
 315   return h;
 316 }
 317
 318 /* Complete possible layout names.  TEXT is the complete text entered so
 319    far, WORD is the word currently being completed.  */
 320
 321 static void
 322 layout_completer (struct cmd_list_element *ignore,
 323                   completion_tracker &tracker,
 324                   const char *text, const char *word)
 325 {
 326   static const char *layout_names [] =
 327     { "src", "asm", "split", "regs", "next", "prev", NULL };
 328
 329   complete_on_enum (tracker, layout_names, text, word);
 330 }
 331
 332 /* Function to initialize gdb commands, for tui window layout
 333    manipulation.  */
 334
 335 void
 336 _initialize_tui_layout (void)
 337 {
 338   struct cmd_list_element *cmd;
 339
 340   cmd = add_com ("layout", class_tui, tui_layout_command, _("\
 341 Change the layout of windows.\n\
 342 Usage: layout prev | next | LAYOUT-NAME\n\
 343 Layout names are:\n\
 344    src   : Displays source and command windows.\n\
 345    asm   : Displays disassembly and command windows.\n\
 346    split : Displays source, disassembly and command windows.\n\
 347    regs  : Displays register window. If existing layout\n\
 348            is source/command or assembly/command, the \n\
 349            register window is displayed. If the\n\
 350            source/assembly/command (split) is displayed, \n\
 351            the register window is displayed with \n\
 352            the window that has current logical focus."));
 353   set_cmd_completer (cmd, layout_completer);
 354 }
 355
 356
 357 /*************************
 358 ** STATIC LOCAL FUNCTIONS
 359 **************************/
 360
 361
 362 /* Function to set the layout to SRC, ASM, SPLIT, NEXT, PREV, DATA, or
 363    REGS. */
 364 enum tui_status
 365 tui_set_layout_by_name (const char *layout_name)
 366 {
 367   enum tui_status status = TUI_SUCCESS;
 368
 369   if (layout_name != NULL)
 370     {
 371       int i;
 372       enum tui_layout_type new_layout = UNDEFINED_LAYOUT;
 373       enum tui_layout_type cur_layout = tui_current_layout ();
 374
 375       std::string copy = layout_name;
 376       for (i = 0; i < copy.size (); i++)
 377         copy[i] = toupper (copy[i]);
 378       const char *buf_ptr = copy.c_str ();
 379
 380       /* First check for ambiguous input.  */
 381       if (strlen (buf_ptr) <= 1 && *buf_ptr == 'S')
 382         {
 383           warning (_("Ambiguous command input."));
 384           status = TUI_FAILURE;
 385         }
 386       else
 387         {
 388           if (subset_compare (buf_ptr, "SRC"))
 389             new_layout = SRC_COMMAND;
 390           else if (subset_compare (buf_ptr, "ASM"))
 391             new_layout = DISASSEM_COMMAND;
 392           else if (subset_compare (buf_ptr, "SPLIT"))
 393             new_layout = SRC_DISASSEM_COMMAND;
 394           else if (subset_compare (buf_ptr, "REGS"))
 395             {
 396               if (cur_layout == SRC_COMMAND
 397                   || cur_layout == SRC_DATA_COMMAND)
 398                 new_layout = SRC_DATA_COMMAND;
 399               else
 400                 new_layout = DISASSEM_DATA_COMMAND;
 401             }
 402           else if (subset_compare (buf_ptr, "NEXT"))
 403             new_layout = next_layout ();
 404           else if (subset_compare (buf_ptr, "PREV"))
 405             new_layout = prev_layout ();
 406           else
 407             status = TUI_FAILURE;
 408
 409           if (status == TUI_SUCCESS)
 410             {
 411               /* Make sure the curses mode is enabled.  */
 412               tui_enable ();
 413               tui_set_layout (new_layout);
 414             }
 415         }
 416     }
 417   else
 418     status = TUI_FAILURE;
 419
 420   return status;
 421 }
 422
 423
 424 static void
 425 extract_display_start_addr (struct gdbarch **gdbarch_p, CORE_ADDR *addr_p)
 426 {
 427   enum tui_layout_type cur_layout = tui_current_layout ();
 428   struct gdbarch *gdbarch = get_current_arch ();
 429   CORE_ADDR addr;
 430   CORE_ADDR pc;
 431   struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 432
 433   switch (cur_layout)
 434     {
 435     case SRC_COMMAND:
 436     case SRC_DATA_COMMAND:
 437       gdbarch = TUI_SRC_WIN->gdbarch;
 438       find_line_pc (cursal.symtab,
 439                     TUI_SRC_WIN->start_line_or_addr.u.line_no,
 440                     &pc);
 441       addr = pc;
 442       break;
 443     case DISASSEM_COMMAND:
 444     case SRC_DISASSEM_COMMAND:
 445     case DISASSEM_DATA_COMMAND:
 446       gdbarch = TUI_DISASM_WIN->gdbarch;
 447       addr = TUI_DISASM_WIN->start_line_or_addr.u.addr;
 448       break;
 449     default:
 450       addr = 0;
 451       break;
 452     }
 453
 454   *gdbarch_p = gdbarch;
 455   *addr_p = addr;
 456 }
 457
 458
 459 static void
 460 tui_layout_command (const char *arg, int from_tty)
 461 {
 462   /* Switch to the selected layout.  */
 463   if (tui_set_layout_by_name (arg) != TUI_SUCCESS)
 464     warning (_("Invalid layout specified.\n%s"), LAYOUT_USAGE);
 465 }
 466
 467 /* Answer the previous layout to cycle to.  */
 468 static enum tui_layout_type
 469 next_layout (void)
 470 {
 471   int new_layout;
 472
 473   new_layout = tui_current_layout ();
 474   if (new_layout == UNDEFINED_LAYOUT)
 475     new_layout = SRC_COMMAND;
 476   else
 477     {
 478       new_layout++;
 479       if (new_layout == UNDEFINED_LAYOUT)
 480         new_layout = SRC_COMMAND;
 481     }
 482
 483   return (enum tui_layout_type) new_layout;
 484 }
 485
 486
 487 /* Answer the next layout to cycle to.  */
 488 static enum tui_layout_type
 489 prev_layout (void)
 490 {
 491   int new_layout;
 492
 493   new_layout = tui_current_layout ();
 494   if (new_layout == SRC_COMMAND)
 495     new_layout = DISASSEM_DATA_COMMAND;
 496   else
 497     {
 498       new_layout--;
 499       if (new_layout == UNDEFINED_LAYOUT)
 500         new_layout = DISASSEM_DATA_COMMAND;
 501     }
 502
 503   return (enum tui_layout_type) new_layout;
 504 }
 505
 506
 507
 508 static struct tui_win_info *
 509 make_command_window (int height, int origin_y)
 510 {
 511   struct tui_win_info *result = new tui_cmd_window ();
 512   result->reset (height, tui_term_width (), 0, origin_y);
 513   tui_make_window (result, DONT_BOX_WINDOW);
 514   return result;
 515 }
 516
 517
 518 /* make_source_window().
 519  */
 520 static struct tui_win_info *
 521 make_source_window (int height, int origin_y)
 522 {
 523   tui_win_info *result = new tui_source_window ();
 524   result->reset (height, tui_term_width (), 0, origin_y);
 525   result->make_visible (true);
 526   return result;
 527 }
 528
 529
 530 /* make_disasm_window().
 531  */
 532 static struct tui_win_info *
 533 make_disasm_window (int height, int origin_y)
 534 {
 535   tui_win_info *result = new tui_disasm_window ();
 536   result->reset (height, tui_term_width (), 0, origin_y);
 537   result->make_visible (true);
 538   return result;
 539 }
 540
 541
 542 static tui_win_info *
 543 make_data_window (int height, int origin_y)
 544 {
 545   tui_win_info *result = new tui_data_window ();
 546   result->reset (height, tui_term_width (), 0, origin_y);
 547   result->make_visible (true);
 548   return result;
 549 }
 550
 551
 552
 553 /* Show the Source/Command layout.  */
 554 static void
 555 show_source_command (void)
 556 {
 557   show_source_or_disasm_and_command (SRC_COMMAND);
 558 }
 559
 560
 561 /* Show the Dissassem/Command layout.  */
 562 static void
 563 show_disasm_command (void)
 564 {
 565   show_source_or_disasm_and_command (DISASSEM_COMMAND);
 566 }
 567
 568
 569 /* Show the Source/Disassem/Command layout.  */
 570 static void
 571 show_source_disasm_command (void)
 572 {
 573   if (tui_current_layout () != SRC_DISASSEM_COMMAND)
 574     {
 575       int cmd_height, src_height, asm_height;
 576
 577       if (TUI_CMD_WIN != NULL)
 578         cmd_height = TUI_CMD_WIN->height;
 579       else
 580         cmd_height = tui_term_height () / 3;
 581
 582       src_height = (tui_term_height () - cmd_height) / 2;
 583       asm_height = tui_term_height () - (src_height + cmd_height);
 584
 585       if (TUI_SRC_WIN == NULL)
 586         tui_win_list[SRC_WIN] = make_source_window (src_height, 0);
 587       else
 588         {
 589           TUI_SRC_WIN->reset (src_height,
 590                               tui_term_width (),
 591                               0,
 592                               0);
 593           tui_make_visible (TUI_SRC_WIN);
 594           TUI_SRC_WIN->m_has_locator = false;
 595         }
 596
 597       struct tui_locator_window *locator = tui_locator_win_info_ptr ();
 598       gdb_assert (locator != nullptr);
 599
 600       tui_show_source_content (TUI_SRC_WIN);
 601       if (TUI_DISASM_WIN == NULL)
 602         {
 603           tui_win_list[DISASSEM_WIN]
 604             = make_disasm_window (asm_height, src_height - 1);
 605           locator->reset (2 /* 1 */ ,
 606                           tui_term_width (),
 607                           0,
 608                           (src_height + asm_height) - 1);
 609         }
 610       else
 611         {
 612           locator->reset (2 /* 1 */ ,
 613                           tui_term_width (),
 614                           0,
 615                           (src_height + asm_height) - 1);
 616           TUI_DISASM_WIN->m_has_locator = true;
 617           TUI_DISASM_WIN->reset (asm_height,
 618                                  tui_term_width (),
 619                                  0,
 620                                  src_height - 1);
 621           tui_make_visible (TUI_DISASM_WIN);
 622         }
 623       TUI_SRC_WIN->m_has_locator = false;
 624       TUI_DISASM_WIN->m_has_locator = true;
 625       tui_make_visible (locator);
 626       tui_show_locator_content ();
 627       tui_show_source_content (TUI_DISASM_WIN);
 628
 629       if (TUI_CMD_WIN == NULL)
 630         tui_win_list[CMD_WIN]
 631           = make_command_window (cmd_height, tui_term_height () - cmd_height);
 632       else
 633         {
 634           TUI_CMD_WIN->reset (TUI_CMD_WIN->height,
 635                               TUI_CMD_WIN->width,
 636                               0,
 637                               TUI_CMD_WIN->origin.y);
 638           tui_make_visible (TUI_CMD_WIN);
 639         }
 640       tui_set_current_layout_to (SRC_DISASSEM_COMMAND);
 641     }
 642 }
 643
 644
 645 /* Show the Source/Data/Command or the Dissassembly/Data/Command
 646    layout.  */
 647 static void
 648 show_data (enum tui_layout_type new_layout)
 649 {
 650   int total_height = (tui_term_height () - TUI_CMD_WIN->height);
 651   int src_height, data_height;
 652   enum tui_win_type win_type;
 653
 654   struct tui_locator_window *locator = tui_locator_win_info_ptr ();
 655   gdb_assert (locator != nullptr);
 656
 657   data_height = total_height / 2;
 658   src_height = total_height - data_height;
 659   tui_make_all_invisible ();
 660   tui_make_invisible (locator);
 661   if (tui_win_list[DATA_WIN] == nullptr)
 662     tui_win_list[DATA_WIN] = make_data_window (data_height, 0);
 663   else
 664     tui_win_list[DATA_WIN]->reset (data_height, tui_term_width (), 0, 0);
 665   tui_win_list[DATA_WIN]->make_visible (true);
 666
 667   if (new_layout == SRC_DATA_COMMAND)
 668     win_type = SRC_WIN;
 669   else
 670     win_type = DISASSEM_WIN;
 671
 672   tui_source_window_base *base;
 673   if (tui_win_list[win_type] == NULL)
 674     {
 675       if (win_type == SRC_WIN)
 676         tui_win_list[win_type]
 677           = make_source_window (src_height, data_height - 1);
 678       else
 679         tui_win_list[win_type]
 680           = make_disasm_window (src_height, data_height - 1);
 681       locator->reset (2 /* 1 */ ,
 682                       tui_term_width (),
 683                       0,
 684                       total_height - 1);
 685       base = (tui_source_window_base *) tui_win_list[win_type];
 686     }
 687   else
 688     {
 689       base = (tui_source_window_base *) tui_win_list[win_type];
 690       tui_win_list[win_type]->reset (src_height,
 691                                      tui_term_width (),
 692                                      0,
 693                                      data_height - 1);
 694       tui_make_visible (tui_win_list[win_type]);
 695       locator->reset (2 /* 1 */ ,
 696                       tui_term_width (),
 697                       0,
 698                       total_height - 1);
 699     }
 700   base->m_has_locator = true;
 701   tui_make_visible (locator);
 702   tui_show_locator_content ();
 703   tui_add_to_source_windows
 704     ((tui_source_window_base *) tui_win_list[win_type]);
 705   tui_set_current_layout_to (new_layout);
 706 }
 707
 708 void
 709 tui_gen_win_info::reset (int height_, int width_,
 710                          int origin_x_, int origin_y_)
 711 {
 712   int h = height_;
 713
 714   width = width_;
 715   height = h;
 716   if (h > 1)
 717     {
 718       viewport_height = h - 1;
 719       if (type != CMD_WIN)
 720         viewport_height--;
 721     }
 722   else
 723     viewport_height = 1;
 724   origin.x = origin_x_;
 725   origin.y = origin_y_;
 726 }
 727
 728 /* Show the Source/Command or the Disassem layout.  */
 729 static void
 730 show_source_or_disasm_and_command (enum tui_layout_type layout_type)
 731 {
 732   if (tui_current_layout () != layout_type)
 733     {
 734       struct tui_win_info **win_info_ptr;
 735       int src_height, cmd_height;
 736       struct tui_locator_window *locator = tui_locator_win_info_ptr ();
 737       gdb_assert (locator != nullptr);
 738
 739       if (TUI_CMD_WIN != NULL)
 740         cmd_height = TUI_CMD_WIN->height;
 741       else
 742         cmd_height = tui_term_height () / 3;
 743       src_height = tui_term_height () - cmd_height;
 744
 745       if (layout_type == SRC_COMMAND)
 746         win_info_ptr = &tui_win_list[SRC_WIN];
 747       else
 748         win_info_ptr = &tui_win_list[DISASSEM_WIN];
 749
 750       tui_source_window_base *base;
 751       if ((*win_info_ptr) == NULL)
 752         {
 753           if (layout_type == SRC_COMMAND)
 754             *win_info_ptr = make_source_window (src_height - 1, 0);
 755           else
 756             *win_info_ptr = make_disasm_window (src_height - 1, 0);
 757           locator->reset (2 /* 1 */ ,
 758                           tui_term_width (),
 759                           0,
 760                           src_height - 1);
 761           base = (tui_source_window_base *) *win_info_ptr;
 762         }
 763       else
 764         {
 765           base = (tui_source_window_base *) *win_info_ptr;
 766           locator->reset (2 /* 1 */ ,
 767                           tui_term_width (),
 768                           0,
 769                           src_height - 1);
 770           base->m_has_locator = true;
 771           (*win_info_ptr)->reset (src_height - 1,
 772                                   tui_term_width (),
 773                                   0,
 774                                   0);
 775           tui_make_visible (*win_info_ptr);
 776         }
 777
 778       base->m_has_locator = true;
 779       tui_make_visible (locator);
 780       tui_show_locator_content ();
 781       tui_show_source_content (base);
 782
 783       if (TUI_CMD_WIN == NULL)
 784         {
 785           tui_win_list[CMD_WIN] = make_command_window (cmd_height,
 786                                                        src_height);
 787         }
 788       else
 789         {
 790           TUI_CMD_WIN->reset (TUI_CMD_WIN->height,
 791                               TUI_CMD_WIN->width,
 792                               TUI_CMD_WIN->origin.x,
 793                               TUI_CMD_WIN->origin.y);
 794           tui_make_visible (TUI_CMD_WIN);
 795         }
 796       tui_set_current_layout_to (layout_type);
 797     }
 798 }