gdb/tui/tui-regs.c

   1 /* TUI display registers in window.
   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 "tui/tui.h"
  25 #include "tui/tui-data.h"
  26 #include "symtab.h"
  27 #include "gdbtypes.h"
  28 #include "gdbcmd.h"
  29 #include "frame.h"
  30 #include "regcache.h"
  31 #include "inferior.h"
  32 #include "target.h"
  33 #include "tui/tui-layout.h"
  34 #include "tui/tui-win.h"
  35 #include "tui/tui-wingeneral.h"
  36 #include "tui/tui-file.h"
  37 #include "tui/tui-regs.h"
  38 #include "tui/tui-io.h"
  39 #include "reggroups.h"
  40 #include "valprint.h"
  41 #include "completer.h"
  42
  43 #include "gdb_curses.h"
  44
  45 /* Get the register from the frame and return a printable
  46    representation of it.  */
  47
  48 static gdb::unique_xmalloc_ptr<char>
  49 tui_register_format (struct frame_info *frame, int regnum)
  50 {
  51   struct gdbarch *gdbarch = get_frame_arch (frame);
  52
  53   string_file stream;
  54
  55   scoped_restore save_pagination
  56     = make_scoped_restore (&pagination_enabled, 0);
  57   scoped_restore save_stdout
  58     = make_scoped_restore (&gdb_stdout, &stream);
  59
  60   gdbarch_print_registers_info (gdbarch, &stream, frame, regnum, 1);
  61
  62   /* Remove the possible \n.  */
  63   std::string &str = stream.string ();
  64   if (!str.empty () && str.back () == '\n')
  65     str.resize (str.size () - 1);
  66
  67   /* Expand tabs into spaces, since ncurses on MS-Windows doesn't.  */
  68   return tui_expand_tabs (str.c_str ());
  69 }
  70
  71 /* Get the register value from the given frame and format it for the
  72    display.  When changep is set, check if the new register value has
  73    changed with respect to the previous call.  */
  74 static void
  75 tui_get_register (struct frame_info *frame,
  76                   struct tui_data_item_window *data,
  77                   int regnum, bool *changedp)
  78 {
  79   if (changedp)
  80     *changedp = false;
  81   if (target_has_registers)
  82     {
  83       gdb::unique_xmalloc_ptr<char> new_content
  84         = tui_register_format (frame, regnum);
  85
  86       if (changedp != NULL
  87           && strcmp (data->content.get (), new_content.get ()) != 0)
  88         *changedp = true;
  89
  90       data->content = std::move (new_content);
  91     }
  92 }
  93
  94 /* See tui-regs.h.  */
  95
  96 int
  97 tui_data_window::last_regs_line_no () const
  98 {
  99   int num_lines = regs_content.size () / regs_column_count;
 100   if (regs_content.size () % regs_column_count)
 101     num_lines++;
 102   return num_lines;
 103 }
 104
 105 /* See tui-regs.h.  */
 106
 107 int
 108 tui_data_window::line_from_reg_element_no (int element_no) const
 109 {
 110   if (element_no < regs_content.size ())
 111     {
 112       int i, line = (-1);
 113
 114       i = 1;
 115       while (line == (-1))
 116         {
 117           if (element_no < regs_column_count * i)
 118             line = i - 1;
 119           else
 120             i++;
 121         }
 122
 123       return line;
 124     }
 125   else
 126     return (-1);
 127 }
 128
 129 /* See tui-regs.h.  */
 130
 131 int
 132 tui_data_window::first_reg_element_no_inline (int line_no) const
 133 {
 134   if (line_no * regs_column_count <= regs_content.size ())
 135     return ((line_no + 1) * regs_column_count) - regs_column_count;
 136   else
 137     return (-1);
 138 }
 139
 140 /* Show the registers of the given group in the data window
 141    and refresh the window.  */
 142 void
 143 tui_data_window::show_registers (struct reggroup *group)
 144 {
 145   if (group == 0)
 146     group = general_reggroup;
 147
 148   if (target_has_registers && target_has_stack && target_has_memory)
 149     {
 150       show_register_group (group, get_selected_frame (NULL),
 151                            group == current_group);
 152
 153       /* Clear all notation of changed values.  */
 154       for (auto &&data_item_win : regs_content)
 155         data_item_win.highlight = false;
 156       current_group = group;
 157       rerender ();
 158     }
 159   else
 160     {
 161       current_group = 0;
 162       erase_data_content (_("[ Register Values Unavailable ]"));
 163     }
 164 }
 165
 166
 167 /* Set the data window to display the registers of the register group
 168    using the given frame.  Values are refreshed only when
 169    refresh_values_only is true.  */
 170
 171 void
 172 tui_data_window::show_register_group (struct reggroup *group,
 173                                       struct frame_info *frame,
 174                                       bool refresh_values_only)
 175 {
 176   struct gdbarch *gdbarch = get_frame_arch (frame);
 177   int nr_regs;
 178   int regnum, pos;
 179
 180   /* Make a new title showing which group we display.  */
 181   title = string_printf ("Register group: %s", reggroup_name (group));
 182
 183   /* See how many registers must be displayed.  */
 184   nr_regs = 0;
 185   for (regnum = 0; regnum < gdbarch_num_cooked_regs (gdbarch); regnum++)
 186     {
 187       const char *name;
 188
 189       /* Must be in the group.  */
 190       if (!gdbarch_register_reggroup_p (gdbarch, regnum, group))
 191         continue;
 192
 193       /* If the register name is empty, it is undefined for this
 194          processor, so don't display anything.  */
 195       name = gdbarch_register_name (gdbarch, regnum);
 196       if (name == 0 || *name == '\0')
 197         continue;
 198
 199       nr_regs++;
 200     }
 201
 202   regs_content.resize (nr_regs);
 203
 204   /* Now set the register names and values.  */
 205   pos = 0;
 206   for (regnum = 0; regnum < gdbarch_num_cooked_regs (gdbarch); regnum++)
 207     {
 208       struct tui_data_item_window *data_item_win;
 209       const char *name;
 210
 211       /* Must be in the group.  */
 212       if (!gdbarch_register_reggroup_p (gdbarch, regnum, group))
 213         continue;
 214
 215       /* If the register name is empty, it is undefined for this
 216          processor, so don't display anything.  */
 217       name = gdbarch_register_name (gdbarch, regnum);
 218       if (name == 0 || *name == '\0')
 219         continue;
 220
 221       data_item_win = &regs_content[pos];
 222       if (data_item_win)
 223         {
 224           if (!refresh_values_only)
 225             {
 226               data_item_win->item_no = regnum;
 227               data_item_win->name = name;
 228               data_item_win->highlight = false;
 229             }
 230           tui_get_register (frame, data_item_win, regnum, 0);
 231         }
 232       pos++;
 233     }
 234 }
 235
 236 /* See tui-regs.h.  */
 237
 238 void
 239 tui_data_window::display_registers_from (int start_element_no)
 240 {
 241   int j, item_win_width, cur_y;
 242
 243   int max_len = 0;
 244   for (auto &&data_item_win : regs_content)
 245     {
 246       const char *p;
 247       int len;
 248
 249       len = 0;
 250       p = data_item_win.content.get ();
 251       if (p != 0)
 252         len = strlen (p);
 253
 254       if (len > max_len)
 255         max_len = len;
 256     }
 257   item_win_width = max_len + 1;
 258   int i = start_element_no;
 259
 260   regs_column_count = (width - 2) / item_win_width;
 261   if (regs_column_count == 0)
 262     regs_column_count = 1;
 263   item_win_width = (width - 2) / regs_column_count;
 264
 265   /* Now create each data "sub" window, and write the display into
 266      it.  */
 267   cur_y = 1;
 268   while (i < regs_content.size ()
 269          && cur_y <= viewport_height)
 270     {
 271       for (j = 0;
 272            j < regs_column_count && i < regs_content.size ();
 273            j++)
 274         {
 275           /* Create the window if necessary.  */
 276           regs_content[i].resize (1, item_win_width,
 277                                   (item_win_width * j) + 1, cur_y);
 278           i++;          /* Next register.  */
 279         }
 280       cur_y++;          /* Next row.  */
 281     }
 282 }
 283
 284 /* See tui-regs.h.  */
 285
 286 void
 287 tui_data_window::display_reg_element_at_line (int start_element_no,
 288                                               int start_line_no)
 289 {
 290   int element_no = start_element_no;
 291
 292   if (start_element_no != 0 && start_line_no != 0)
 293     {
 294       int last_line_no, first_line_on_last_page;
 295
 296       last_line_no = last_regs_line_no ();
 297       first_line_on_last_page = last_line_no - (height - 2);
 298       if (first_line_on_last_page < 0)
 299         first_line_on_last_page = 0;
 300
 301       /* If the element_no causes us to scroll past the end of the
 302          registers, adjust what element to really start the
 303          display at.  */
 304       if (start_line_no > first_line_on_last_page)
 305         element_no = first_reg_element_no_inline (first_line_on_last_page);
 306     }
 307   display_registers_from (element_no);
 308 }
 309
 310 /* See tui-regs.h.  */
 311
 312 int
 313 tui_data_window::display_registers_from_line (int line_no)
 314 {
 315   int element_no;
 316
 317   if (line_no < 0)
 318     line_no = 0;
 319   else
 320     {
 321       /* Make sure that we don't display off the end of the
 322          registers.  */
 323       if (line_no >= last_regs_line_no ())
 324         {
 325           line_no = line_from_reg_element_no (regs_content.size () - 1);
 326           if (line_no < 0)
 327             line_no = 0;
 328         }
 329     }
 330
 331   element_no = first_reg_element_no_inline (line_no);
 332   if (element_no < regs_content.size ())
 333     display_reg_element_at_line (element_no, line_no);
 334   else
 335     line_no = (-1);
 336
 337   return line_no;
 338 }
 339
 340
 341 /* Answer the index first element displayed.  If none are displayed,
 342    then return (-1).  */
 343 int
 344 tui_data_window::first_data_item_displayed ()
 345 {
 346   for (int i = 0; i < regs_content.size (); i++)
 347     {
 348       struct tui_gen_win_info *data_item_win;
 349
 350       data_item_win = &regs_content[i];
 351       if (data_item_win->is_visible ())
 352         return i;
 353     }
 354
 355   return -1;
 356 }
 357
 358 /* See tui-regs.h.  */
 359
 360 void
 361 tui_data_window::delete_data_content_windows ()
 362 {
 363   for (auto &&win : regs_content)
 364     {
 365       tui_delete_win (win.handle);
 366       win.handle = NULL;
 367     }
 368 }
 369
 370
 371 void
 372 tui_data_window::erase_data_content (const char *prompt)
 373 {
 374   werase (handle);
 375   check_and_display_highlight_if_needed ();
 376   if (prompt != NULL)
 377     {
 378       int half_width = (width - 2) / 2;
 379       int x_pos;
 380
 381       if (strlen (prompt) >= half_width)
 382         x_pos = 1;
 383       else
 384         x_pos = half_width - strlen (prompt);
 385       mvwaddstr (handle, (height / 2), x_pos, (char *) prompt);
 386     }
 387   wrefresh (handle);
 388 }
 389
 390 /* See tui-regs.h.  */
 391
 392 void
 393 tui_data_window::rerender ()
 394 {
 395   if (regs_content.empty ())
 396     erase_data_content (_("[ Register Values Unavailable ]"));
 397   else
 398     {
 399       erase_data_content (NULL);
 400       delete_data_content_windows ();
 401       display_registers_from (0);
 402     }
 403 }
 404
 405
 406 /* Scroll the data window vertically forward or backward.  */
 407 void
 408 tui_data_window::do_scroll_vertical (int num_to_scroll)
 409 {
 410   int first_element_no;
 411   int first_line = (-1);
 412
 413   first_element_no = first_data_item_displayed ();
 414   if (first_element_no < regs_content.size ())
 415     first_line = line_from_reg_element_no (first_element_no);
 416   else
 417     { /* Calculate the first line from the element number which is in
 418         the general data content.  */
 419     }
 420
 421   if (first_line >= 0)
 422     {
 423       first_line += num_to_scroll;
 424       erase_data_content (NULL);
 425       delete_data_content_windows ();
 426       display_registers_from_line (first_line);
 427     }
 428 }
 429
 430 /* See tui-regs.h.  */
 431
 432 void
 433 tui_data_window::refresh_window ()
 434 {
 435   tui_gen_win_info::refresh_window ();
 436   for (auto &&win : regs_content)
 437     win.refresh_window ();
 438 }
 439
 440 /* This function check all displayed registers for changes in values,
 441    given a particular frame.  If the values have changed, they are
 442    updated with the new value and highlighted.  */
 443 void
 444 tui_data_window::check_register_values (struct frame_info *frame)
 445 {
 446   if (regs_content.empty ())
 447     show_registers (current_group);
 448   else
 449     {
 450       for (auto &&data_item_win : regs_content)
 451         {
 452           int was_hilighted;
 453
 454           was_hilighted = data_item_win.highlight;
 455
 456           tui_get_register (frame, &data_item_win,
 457                             data_item_win.item_no,
 458                             &data_item_win.highlight);
 459
 460           if (data_item_win.highlight || was_hilighted)
 461             data_item_win.rerender ();
 462         }
 463     }
 464 }
 465
 466 /* Display a register in a window.  If hilite is TRUE, then the value
 467    will be displayed in reverse video.  */
 468 void
 469 tui_data_item_window::rerender ()
 470 {
 471   int i;
 472
 473   scrollok (handle, FALSE);
 474   if (highlight)
 475     /* We ignore the return value, casting it to void in order to avoid
 476        a compiler warning.  The warning itself was introduced by a patch
 477        to ncurses 5.7 dated 2009-08-29, changing this macro to expand
 478        to code that causes the compiler to generate an unused-value
 479        warning.  */
 480     (void) wstandout (handle);
 481
 482   wmove (handle, 0, 0);
 483   for (i = 1; i < width; i++)
 484     waddch (handle, ' ');
 485   wmove (handle, 0, 0);
 486   if (content)
 487     waddstr (handle, content.get ());
 488
 489   if (highlight)
 490     /* We ignore the return value, casting it to void in order to avoid
 491        a compiler warning.  The warning itself was introduced by a patch
 492        to ncurses 5.7 dated 2009-08-29, changing this macro to expand
 493        to code that causes the compiler to generate an unused-value
 494        warning.  */
 495     (void) wstandend (handle);
 496   refresh_window ();
 497 }
 498
 499 void
 500 tui_data_item_window::refresh_window ()
 501 {
 502   if (handle != nullptr)
 503     {
 504       /* This seems to be needed because the data items are nested
 505          windows, which according to the ncurses man pages aren't well
 506          supported.  */
 507       touchwin (handle);
 508       wrefresh (handle);
 509     }
 510 }
 511
 512 /* Helper for "tui reg next", wraps a call to REGGROUP_NEXT, but adds wrap
 513    around behaviour.  Returns the next register group, or NULL if the
 514    register window is not currently being displayed.  */
 515
 516 static struct reggroup *
 517 tui_reg_next (struct reggroup *current_group, struct gdbarch *gdbarch)
 518 {
 519   struct reggroup *group = NULL;
 520
 521   if (current_group != NULL)
 522     {
 523       group = reggroup_next (gdbarch, current_group);
 524       if (group == NULL)
 525         group = reggroup_next (gdbarch, NULL);
 526     }
 527   return group;
 528 }
 529
 530 /* Helper for "tui reg prev", wraps a call to REGGROUP_PREV, but adds wrap
 531    around behaviour.  Returns the previous register group, or NULL if the
 532    register window is not currently being displayed.  */
 533
 534 static struct reggroup *
 535 tui_reg_prev (struct reggroup *current_group, struct gdbarch *gdbarch)
 536 {
 537   struct reggroup *group = NULL;
 538
 539   if (current_group != NULL)
 540     {
 541       group = reggroup_prev (gdbarch, current_group);
 542       if (group == NULL)
 543         group = reggroup_prev (gdbarch, NULL);
 544     }
 545   return group;
 546 }
 547
 548 /* A helper function to display the register window in the appropriate
 549    way.  */
 550
 551 static void
 552 tui_reg_layout ()
 553 {
 554   enum tui_layout_type cur_layout = tui_current_layout ();
 555   enum tui_layout_type new_layout;
 556   if (cur_layout == SRC_COMMAND || cur_layout == SRC_DATA_COMMAND)
 557     new_layout = SRC_DATA_COMMAND;
 558   else
 559     new_layout = DISASSEM_DATA_COMMAND;
 560   tui_set_layout (new_layout);
 561 }
 562
 563 /* Implement the 'tui reg' command.  Changes the register group displayed
 564    in the tui register window.  Displays the tui register window if it is
 565    not already on display.  */
 566
 567 static void
 568 tui_reg_command (const char *args, int from_tty)
 569 {
 570   struct gdbarch *gdbarch = get_current_arch ();
 571
 572   if (args != NULL)
 573     {
 574       struct reggroup *group, *match = NULL;
 575       size_t len = strlen (args);
 576
 577       /* Make sure the curses mode is enabled.  */
 578       tui_enable ();
 579
 580       /* Make sure the register window is visible.  If not, select an
 581          appropriate layout.  We need to do this before trying to run the
 582          'next' or 'prev' commands.  */
 583       if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->is_visible ())
 584         tui_reg_layout ();
 585
 586       struct reggroup *current_group = TUI_DATA_WIN->get_current_group ();
 587       if (strncmp (args, "next", len) == 0)
 588         match = tui_reg_next (current_group, gdbarch);
 589       else if (strncmp (args, "prev", len) == 0)
 590         match = tui_reg_prev (current_group, gdbarch);
 591
 592       /* This loop matches on the initial part of a register group
 593          name.  If this initial part in ARGS matches only one register
 594          group then the switch is made.  */
 595       for (group = reggroup_next (gdbarch, NULL);
 596            group != NULL;
 597            group = reggroup_next (gdbarch, group))
 598         {
 599           if (strncmp (reggroup_name (group), args, len) == 0)
 600             {
 601               if (match != NULL)
 602                 error (_("ambiguous register group name '%s'"), args);
 603               match = group;
 604             }
 605         }
 606
 607       if (match == NULL)
 608         error (_("unknown register group '%s'"), args);
 609
 610       TUI_DATA_WIN->show_registers (match);
 611     }
 612   else
 613     {
 614       struct reggroup *group;
 615       int first;
 616
 617       printf_unfiltered (_("\"tui reg\" must be followed by the name of "
 618                            "either a register group,\nor one of 'next' "
 619                            "or 'prev'.  Known register groups are:\n"));
 620
 621       for (first = 1, group = reggroup_next (gdbarch, NULL);
 622            group != NULL;
 623            first = 0, group = reggroup_next (gdbarch, group))
 624         {
 625           if (!first)
 626             printf_unfiltered (", ");
 627           printf_unfiltered ("%s", reggroup_name (group));
 628         }
 629
 630       printf_unfiltered ("\n");
 631     }
 632 }
 633
 634 /* Complete names of register groups, and add the special "prev" and "next"
 635    names.  */
 636
 637 static void
 638 tui_reggroup_completer (struct cmd_list_element *ignore,
 639                         completion_tracker &tracker,
 640                         const char *text, const char *word)
 641 {
 642   static const char *extra[] = { "next", "prev", NULL };
 643   size_t len = strlen (word);
 644   const char **tmp;
 645
 646   reggroup_completer (ignore, tracker, text, word);
 647
 648   /* XXXX use complete_on_enum instead?  */
 649   for (tmp = extra; *tmp != NULL; ++tmp)
 650     {
 651       if (strncmp (word, *tmp, len) == 0)
 652         tracker.add_completion (make_unique_xstrdup (*tmp));
 653     }
 654 }
 655
 656 void
 657 _initialize_tui_regs (void)
 658 {
 659   struct cmd_list_element **tuicmd, *cmd;
 660
 661   tuicmd = tui_get_cmd_list ();
 662
 663   cmd = add_cmd ("reg", class_tui, tui_reg_command, _("\
 664 TUI command to control the register window."), tuicmd);
 665   set_cmd_completer (cmd, tui_reggroup_completer);
 666 }