gdb/tui/tui-winsource.c

   1 /* TUI display source/assembly 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 <ctype.h>
  24 #include "symtab.h"
  25 #include "frame.h"
  26 #include "breakpoint.h"
  27 #include "value.h"
  28 #include "source.h"
  29 #include "objfiles.h"
  30 #include "filenames.h"
  31
  32 #include "tui/tui.h"
  33 #include "tui/tui-data.h"
  34 #include "tui/tui-io.h"
  35 #include "tui/tui-stack.h"
  36 #include "tui/tui-win.h"
  37 #include "tui/tui-wingeneral.h"
  38 #include "tui/tui-winsource.h"
  39 #include "tui/tui-source.h"
  40 #include "tui/tui-disasm.h"
  41 #include "gdb_curses.h"
  42
  43 /* Function to display the "main" routine.  */
  44 void
  45 tui_display_main ()
  46 {
  47   if (!tui_source_windows ().empty ())
  48     {
  49       struct gdbarch *gdbarch;
  50       CORE_ADDR addr;
  51
  52       tui_get_begin_asm_address (&gdbarch, &addr);
  53       if (addr != (CORE_ADDR) 0)
  54         {
  55           struct symtab *s;
  56
  57           tui_update_source_windows_with_addr (gdbarch, addr);
  58           s = find_pc_line_symtab (addr);
  59           if (s != NULL)
  60              tui_update_locator_fullname (symtab_to_fullname (s));
  61           else
  62              tui_update_locator_fullname ("??");
  63         }
  64     }
  65 }
  66
  67
  68
  69 /* Function to display source in the source window.  This function
  70    initializes the horizontal scroll to 0.  */
  71 void
  72 tui_update_source_window (struct tui_source_window_base *win_info,
  73                           struct gdbarch *gdbarch,
  74                           struct symtab *s,
  75                           struct tui_line_or_address line_or_addr,
  76                           int noerror)
  77 {
  78   win_info->horizontal_offset = 0;
  79   tui_update_source_window_as_is (win_info, gdbarch, s, line_or_addr, noerror);
  80
  81   return;
  82 }
  83
  84
  85 /* Function to display source in the source/asm window.  This function
  86    shows the source as specified by the horizontal offset.  */
  87 void
  88 tui_update_source_window_as_is (struct tui_source_window_base *win_info,
  89                                 struct gdbarch *gdbarch,
  90                                 struct symtab *s,
  91                                 struct tui_line_or_address line_or_addr,
  92                                 int noerror)
  93 {
  94   enum tui_status ret;
  95
  96   if (win_info->type == SRC_WIN)
  97     ret = tui_set_source_content (s, line_or_addr.u.line_no, noerror);
  98   else
  99     ret = tui_set_disassem_content (gdbarch, line_or_addr.u.addr);
 100
 101   if (ret == TUI_FAILURE)
 102     {
 103       tui_clear_source_content (win_info, EMPTY_SOURCE_PROMPT);
 104       tui_clear_exec_info_content (win_info);
 105     }
 106   else
 107     {
 108       tui_update_breakpoint_info (win_info, 0);
 109       tui_show_source_content (win_info);
 110       tui_update_exec_info (win_info);
 111       if (win_info->type == SRC_WIN)
 112         {
 113           symtab_and_line sal;
 114
 115           sal.line = line_or_addr.u.line_no +
 116             (win_info->content.size () - 2);
 117           sal.symtab = s;
 118           sal.pspace = SYMTAB_PSPACE (s);
 119           set_current_source_symtab_and_line (sal);
 120           /* If the focus was in the asm win, put it in the src win if
 121              we don't have a split layout.  */
 122           if (tui_win_with_focus () == TUI_DISASM_WIN
 123               && tui_current_layout () != SRC_DISASSEM_COMMAND)
 124             tui_set_win_focus_to (TUI_SRC_WIN);
 125         }
 126     }
 127
 128
 129   return;
 130 }
 131
 132
 133 /* Function to ensure that the source and/or disassemly windows
 134    reflect the input address.  */
 135 void
 136 tui_update_source_windows_with_addr (struct gdbarch *gdbarch, CORE_ADDR addr)
 137 {
 138   if (addr != 0)
 139     {
 140       struct symtab_and_line sal;
 141       struct tui_line_or_address l;
 142
 143       switch (tui_current_layout ())
 144         {
 145         case DISASSEM_COMMAND:
 146         case DISASSEM_DATA_COMMAND:
 147           tui_show_disassem (gdbarch, addr);
 148           break;
 149         case SRC_DISASSEM_COMMAND:
 150           tui_show_disassem_and_update_source (gdbarch, addr);
 151           break;
 152         default:
 153           sal = find_pc_line (addr, 0);
 154           l.loa = LOA_LINE;
 155           l.u.line_no = sal.line;
 156           tui_show_symtab_source (gdbarch, sal.symtab, l, FALSE);
 157           break;
 158         }
 159     }
 160   else
 161     {
 162       for (struct tui_source_window_base *win_info : tui_source_windows ())
 163         {
 164           tui_clear_source_content (win_info, EMPTY_SOURCE_PROMPT);
 165           tui_clear_exec_info_content (win_info);
 166         }
 167     }
 168 }
 169
 170 /* Function to ensure that the source and/or disassemly windows
 171    reflect the input address.  */
 172 void
 173 tui_update_source_windows_with_line (struct symtab *s, int line)
 174 {
 175   struct gdbarch *gdbarch;
 176   CORE_ADDR pc;
 177   struct tui_line_or_address l;
 178
 179   if (!s)
 180     return;
 181
 182   gdbarch = get_objfile_arch (SYMTAB_OBJFILE (s));
 183
 184   switch (tui_current_layout ())
 185     {
 186     case DISASSEM_COMMAND:
 187     case DISASSEM_DATA_COMMAND:
 188       find_line_pc (s, line, &pc);
 189       tui_update_source_windows_with_addr (gdbarch, pc);
 190       break;
 191     default:
 192       l.loa = LOA_LINE;
 193       l.u.line_no = line;
 194       tui_show_symtab_source (gdbarch, s, l, FALSE);
 195       if (tui_current_layout () == SRC_DISASSEM_COMMAND)
 196         {
 197           find_line_pc (s, line, &pc);
 198           tui_show_disassem (gdbarch, pc);
 199         }
 200       break;
 201     }
 202
 203   return;
 204 }
 205
 206 void
 207 tui_clear_source_content (struct tui_source_window_base *win_info,
 208                           int display_prompt)
 209 {
 210   if (win_info != NULL)
 211     {
 212       int i;
 213
 214       win_info->content_in_use = FALSE;
 215       tui_erase_source_content (win_info, display_prompt);
 216       for (i = 0; i < win_info->content.size (); i++)
 217         {
 218           struct tui_source_element *element = &win_info->content[i];
 219
 220           element->break_mode = 0;
 221           element->is_exec_point = false;
 222         }
 223     }
 224 }
 225
 226
 227 void
 228 tui_erase_source_content (struct tui_source_window_base *win_info,
 229                           int display_prompt)
 230 {
 231   int x_pos;
 232   int half_width = (win_info->width - 2) / 2;
 233
 234   if (win_info->handle != NULL)
 235     {
 236       werase (win_info->handle);
 237       tui_check_and_display_highlight_if_needed (win_info);
 238       if (display_prompt == EMPTY_SOURCE_PROMPT)
 239         {
 240           const char *no_src_str;
 241
 242           if (win_info->type == SRC_WIN)
 243             no_src_str = NO_SRC_STRING;
 244           else
 245             no_src_str = NO_DISASSEM_STRING;
 246           if (strlen (no_src_str) >= half_width)
 247             x_pos = 1;
 248           else
 249             x_pos = half_width - strlen (no_src_str);
 250           mvwaddstr (win_info->handle,
 251                      (win_info->height / 2),
 252                      x_pos,
 253                      (char *) no_src_str);
 254
 255           /* elz: Added this function call to set the real contents of
 256              the window to what is on the screen, so that later calls
 257              to refresh, do display the correct stuff, and not the old
 258              image.  */
 259
 260           tui_set_source_content_nil (win_info, no_src_str);
 261         }
 262       win_info->refresh_window ();
 263     }
 264 }
 265
 266
 267 /* Redraw the complete line of a source or disassembly window.  */
 268 static void
 269 tui_show_source_line (struct tui_source_window_base *win_info, int lineno)
 270 {
 271   struct tui_source_element *line;
 272   int x;
 273
 274   line = &win_info->content[lineno - 1];
 275   if (line->is_exec_point)
 276     tui_set_reverse_mode (win_info->handle, true);
 277
 278   wmove (win_info->handle, lineno, 1);
 279   tui_puts (line->line,
 280             win_info->handle);
 281   if (line->is_exec_point)
 282     tui_set_reverse_mode (win_info->handle, false);
 283
 284   /* Clear to end of line but stop before the border.  */
 285   x = getcurx (win_info->handle);
 286   while (x + 1 < win_info->width)
 287     {
 288       waddch (win_info->handle, ' ');
 289       x = getcurx (win_info->handle);
 290     }
 291 }
 292
 293 void
 294 tui_show_source_content (struct tui_source_window_base *win_info)
 295 {
 296   if (!win_info->content.empty ())
 297     {
 298       int lineno;
 299
 300       for (lineno = 1; lineno <= win_info->content.size (); lineno++)
 301         tui_show_source_line (win_info, lineno);
 302     }
 303   else
 304     tui_erase_source_content (win_info, TRUE);
 305
 306   tui_check_and_display_highlight_if_needed (win_info);
 307   win_info->refresh_window ();
 308   win_info->content_in_use = TRUE;
 309 }
 310
 311 /* See tui-data.h.  */
 312
 313 void
 314 tui_source_window_base::refill ()
 315 {
 316   symtab *s = nullptr;
 317
 318   if (type == SRC_WIN)
 319     {
 320       symtab_and_line cursal = get_current_source_symtab_and_line ();
 321       s = (cursal.symtab == NULL
 322            ? find_pc_line_symtab (get_frame_pc (get_selected_frame (NULL)))
 323            : cursal.symtab);
 324     }
 325
 326   tui_update_source_window_as_is (this, gdbarch, s,
 327                                   content[0].line_or_addr,
 328                                   FALSE);
 329 }
 330
 331 /* Scroll the source forward or backward horizontally.  */
 332
 333 void
 334 tui_source_window_base::do_scroll_horizontal (int num_to_scroll)
 335 {
 336   if (!content.empty ())
 337     {
 338       int offset = horizontal_offset + num_to_scroll;
 339       if (offset < 0)
 340         offset = 0;
 341       horizontal_offset = offset;
 342       refill ();
 343     }
 344 }
 345
 346
 347 /* Set or clear the is_exec_point flag in the line whose line is
 348    line_no.  */
 349
 350 void
 351 tui_source_window_base::set_is_exec_point_at (struct tui_line_or_address l)
 352 {
 353   bool changed = false;
 354   int i;
 355
 356   i = 0;
 357   while (i < content.size ())
 358     {
 359       bool new_state;
 360       struct tui_line_or_address content_loa =
 361         content[i].line_or_addr;
 362
 363       gdb_assert (l.loa == LOA_ADDRESS || l.loa == LOA_LINE);
 364       gdb_assert (content_loa.loa == LOA_LINE
 365                   || content_loa.loa == LOA_ADDRESS);
 366       if (content_loa.loa == l.loa
 367           && ((l.loa == LOA_LINE && content_loa.u.line_no == l.u.line_no)
 368               || (l.loa == LOA_ADDRESS && content_loa.u.addr == l.u.addr)))
 369         new_state = true;
 370       else
 371         new_state = false;
 372       if (new_state != content[i].is_exec_point)
 373         {
 374           changed = true;
 375           content[i].is_exec_point = new_state;
 376           tui_show_source_line (this, i + 1);
 377         }
 378       i++;
 379     }
 380   if (changed)
 381     refill ();
 382 }
 383
 384 /* Update the execution windows to show the active breakpoints.
 385    This is called whenever a breakpoint is inserted, removed or
 386    has its state changed.  */
 387 void
 388 tui_update_all_breakpoint_info ()
 389 {
 390   for (tui_source_window_base *win : tui_source_windows ())
 391     {
 392       if (tui_update_breakpoint_info (win, FALSE))
 393         {
 394           tui_update_exec_info (win);
 395         }
 396     }
 397 }
 398
 399
 400 /* Scan the source window and the breakpoints to update the has_break
 401    information for each line.
 402
 403    Returns 1 if something changed and the execution window must be
 404    refreshed.  */
 405
 406 int
 407 tui_update_breakpoint_info (struct tui_source_window_base *win,
 408                             int current_only)
 409 {
 410   int i;
 411   int need_refresh = 0;
 412   tui_source_window_base *src = (tui_source_window_base *) win;
 413
 414   for (i = 0; i < win->content.size (); i++)
 415     {
 416       struct breakpoint *bp;
 417       extern struct breakpoint *breakpoint_chain;
 418       struct tui_source_element *line;
 419
 420       line = &win->content[i];
 421       if (current_only && !line->is_exec_point)
 422          continue;
 423
 424       /* Scan each breakpoint to see if the current line has something to
 425          do with it.  Identify enable/disabled breakpoints as well as
 426          those that we already hit.  */
 427       tui_bp_flags mode = 0;
 428       for (bp = breakpoint_chain;
 429            bp != NULL;
 430            bp = bp->next)
 431         {
 432           struct bp_location *loc;
 433
 434           gdb_assert (line->line_or_addr.loa == LOA_LINE
 435                       || line->line_or_addr.loa == LOA_ADDRESS);
 436
 437           for (loc = bp->loc; loc != NULL; loc = loc->next)
 438             {
 439               if ((win == TUI_SRC_WIN
 440                    && loc->symtab != NULL
 441                    && filename_cmp (src->fullname,
 442                                     symtab_to_fullname (loc->symtab)) == 0
 443                    && line->line_or_addr.loa == LOA_LINE
 444                    && loc->line_number == line->line_or_addr.u.line_no)
 445                   || (win == TUI_DISASM_WIN
 446                       && line->line_or_addr.loa == LOA_ADDRESS
 447                       && loc->address == line->line_or_addr.u.addr))
 448                 {
 449                   if (bp->enable_state == bp_disabled)
 450                     mode |= TUI_BP_DISABLED;
 451                   else
 452                     mode |= TUI_BP_ENABLED;
 453                   if (bp->hit_count)
 454                     mode |= TUI_BP_HIT;
 455                   if (bp->loc->cond)
 456                     mode |= TUI_BP_CONDITIONAL;
 457                   if (bp->type == bp_hardware_breakpoint)
 458                     mode |= TUI_BP_HARDWARE;
 459                 }
 460             }
 461         }
 462       if (line->break_mode != mode)
 463         {
 464           line->break_mode = mode;
 465           need_refresh = true;
 466         }
 467     }
 468   return need_refresh;
 469 }
 470
 471 /* See tui-data.h.  */
 472
 473 tui_exec_info_content *
 474 tui_exec_info_window::maybe_allocate_content (int n_elements)
 475 {
 476   if (m_content == nullptr)
 477     m_content = XNEWVEC (tui_exec_info_content, n_elements);
 478   return m_content;
 479 }
 480
 481
 482 /* Function to initialize the content of the execution info window,
 483    based upon the input window which is either the source or
 484    disassembly window.  */
 485 void
 486 tui_set_exec_info_content (struct tui_source_window_base *win_info)
 487 {
 488   if (win_info->execution_info != NULL)
 489     {
 490       tui_exec_info_content *content
 491         = win_info->execution_info->maybe_allocate_content (win_info->height);
 492
 493       tui_update_breakpoint_info (win_info, 1);
 494       for (int i = 0; i < win_info->content.size (); i++)
 495         {
 496           tui_exec_info_content &element = content[i];
 497           struct tui_source_element *src_element;
 498           tui_bp_flags mode;
 499
 500           src_element = &win_info->content[i];
 501
 502           memset (element, ' ', sizeof (tui_exec_info_content));
 503           element[TUI_EXECINFO_SIZE - 1] = 0;
 504
 505           /* Now update the exec info content based upon the state
 506              of each line as indicated by the source content.  */
 507           mode = src_element->break_mode;
 508           if (mode & TUI_BP_HIT)
 509             element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'H' : 'B';
 510           else if (mode & (TUI_BP_ENABLED | TUI_BP_DISABLED))
 511             element[TUI_BP_HIT_POS] = (mode & TUI_BP_HARDWARE) ? 'h' : 'b';
 512
 513           if (mode & TUI_BP_ENABLED)
 514             element[TUI_BP_BREAK_POS] = '+';
 515           else if (mode & TUI_BP_DISABLED)
 516             element[TUI_BP_BREAK_POS] = '-';
 517
 518           if (src_element->is_exec_point)
 519             element[TUI_EXEC_POS] = '>';
 520         }
 521     }
 522 }
 523
 524
 525 void
 526 tui_show_exec_info_content (struct tui_source_window_base *win_info)
 527 {
 528   struct tui_exec_info_window *exec_info = win_info->execution_info;
 529   const tui_exec_info_content *content = exec_info->get_content ();
 530
 531   werase (exec_info->handle);
 532   exec_info->refresh_window ();
 533   for (int cur_line = 1; cur_line <= win_info->content.size (); cur_line++)
 534     mvwaddstr (exec_info->handle,
 535                cur_line,
 536                0,
 537                content[cur_line - 1]);
 538   exec_info->refresh_window ();
 539   exec_info->content_in_use = TRUE;
 540 }
 541
 542
 543 void
 544 tui_erase_exec_info_content (struct tui_source_window_base *win_info)
 545 {
 546   struct tui_gen_win_info *exec_info = win_info->execution_info;
 547
 548   werase (exec_info->handle);
 549   exec_info->refresh_window ();
 550 }
 551
 552 void
 553 tui_clear_exec_info_content (struct tui_source_window_base *win_info)
 554 {
 555   win_info->execution_info->content_in_use = FALSE;
 556   tui_erase_exec_info_content (win_info);
 557 }
 558
 559 /* Function to update the execution info window.  */
 560 void
 561 tui_update_exec_info (struct tui_source_window_base *win_info)
 562 {
 563   tui_set_exec_info_content (win_info);
 564   tui_show_exec_info_content (win_info);
 565 }
 566
 567 void
 568 tui_alloc_source_buffer (struct tui_source_window_base *win_info)
 569 {
 570   int i, line_width, max_lines;
 571
 572   /* The window width/height includes the highlight box.  Determine actual
 573      content dimensions, including string null-terminators.  */
 574   max_lines = win_info->height - 2;
 575   line_width = win_info->width - 2 + 1;
 576
 577   /* Allocate the buffer for the source lines.  */
 578   win_info->content.resize (max_lines);
 579   for (i = 0; i < max_lines; i++)
 580     {
 581       if (win_info->content[i].line == nullptr)
 582         win_info->content[i].line = (char *) xmalloc (line_width);
 583     }
 584 }
 585
 586
 587 /* Answer whether a particular line number or address is displayed
 588    in the current source window.  */
 589 int
 590 tui_line_is_displayed (int line,
 591                        struct tui_source_window_base *win_info,
 592                        int check_threshold)
 593 {
 594   int is_displayed = FALSE;
 595   int i, threshold;
 596
 597   if (check_threshold)
 598     threshold = SCROLL_THRESHOLD;
 599   else
 600     threshold = 0;
 601   i = 0;
 602   while (i < win_info->content.size () - threshold
 603          && !is_displayed)
 604     {
 605       is_displayed
 606         = win_info->content[i].line_or_addr.loa == LOA_LINE
 607           && win_info->content[i].line_or_addr.u.line_no == line;
 608       i++;
 609     }
 610
 611   return is_displayed;
 612 }
 613
 614
 615 /* Answer whether a particular line number or address is displayed
 616    in the current source window.  */
 617 int
 618 tui_addr_is_displayed (CORE_ADDR addr,
 619                        struct tui_source_window_base *win_info,
 620                        int check_threshold)
 621 {
 622   int is_displayed = FALSE;
 623   int i, threshold;
 624
 625   if (check_threshold)
 626     threshold = SCROLL_THRESHOLD;
 627   else
 628     threshold = 0;
 629   i = 0;
 630   while (i < win_info->content.size () - threshold
 631          && !is_displayed)
 632     {
 633       is_displayed
 634         = win_info->content[i].line_or_addr.loa == LOA_ADDRESS
 635           && win_info->content[i].line_or_addr.u.addr == addr;
 636       i++;
 637     }
 638
 639   return is_displayed;
 640 }
 641
 642
 643 /*****************************************
 644 ** STATIC LOCAL FUNCTIONS               **
 645 ******************************************/