gdb/tui/tui-source.c

   1 /* TUI display source 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 <math.h>
  24 #include <ctype.h>
  25 #include "symtab.h"
  26 #include "frame.h"
  27 #include "breakpoint.h"
  28 #include "source.h"
  29 #include "objfiles.h"
  30 #include "filenames.h"
  31 #include "source-cache.h"
  32
  33 #include "tui/tui.h"
  34 #include "tui/tui-data.h"
  35 #include "tui/tui-io.h"
  36 #include "tui/tui-stack.h"
  37 #include "tui/tui-win.h"
  38 #include "tui/tui-winsource.h"
  39 #include "tui/tui-source.h"
  40 #include "gdb_curses.h"
  41
  42 /* Function to display source in the source window.  */
  43 bool
  44 tui_source_window::set_contents (struct gdbarch *arch,
  45                                  struct symtab *s,
  46                                  struct tui_line_or_address line_or_addr)
  47 {
  48   gdb_assert (line_or_addr.loa == LOA_LINE);
  49   int line_no = line_or_addr.u.line_no;
  50
  51   if (s == NULL)
  52     return false;
  53
  54   int line_width, nlines;
  55
  56   line_width = width - TUI_EXECINFO_SIZE - 1;
  57   /* Take hilite (window border) into account, when
  58      calculating the number of lines.  */
  59   nlines = (line_no + (height - 2)) - line_no;
  60
  61   std::string srclines;
  62   const std::vector<off_t> *offsets;
  63   if (!g_source_cache.get_source_lines (s, line_no, line_no + nlines,
  64                                         &srclines)
  65       || !g_source_cache.get_line_charpos (s, &offsets))
  66     return false;
  67
  68   int cur_line_no, cur_line;
  69   struct tui_locator_window *locator
  70     = tui_locator_win_info_ptr ();
  71   const char *s_filename = symtab_to_filename_for_display (s);
  72
  73   title = s_filename;
  74
  75   m_fullname = make_unique_xstrdup (symtab_to_fullname (s));
  76
  77   cur_line = 0;
  78   gdbarch = get_objfile_arch (SYMTAB_OBJFILE (s));
  79   start_line_or_addr.loa = LOA_LINE;
  80   cur_line_no = start_line_or_addr.u.line_no = line_no;
  81
  82   int digits = 0;
  83   if (compact_source)
  84     {
  85       /* Solaris 11+gcc 5.5 has ambiguous overloads of log10, so we
  86          cast to double to get the right one.  */
  87       double l = log10 ((double) offsets->size ());
  88       digits = 1 + (int) l;
  89     }
  90
  91   const char *iter = srclines.c_str ();
  92   content.resize (nlines);
  93   while (cur_line < nlines)
  94     {
  95       struct tui_source_element *element
  96         = &content[cur_line];
  97
  98       std::string text;
  99       if (*iter != '\0')
 100         text = tui_copy_source_line (&iter, cur_line_no,
 101                                      horizontal_offset,
 102                                      line_width, digits);
 103
 104       /* Set whether element is the execution point
 105          and whether there is a break point on it.  */
 106       element->line_or_addr.loa = LOA_LINE;
 107       element->line_or_addr.u.line_no = cur_line_no;
 108       element->is_exec_point
 109         = (filename_cmp (locator->full_name.c_str (),
 110                          symtab_to_fullname (s)) == 0
 111            && cur_line_no == locator->line_no);
 112
 113       content[cur_line].line = std::move (text);
 114
 115       cur_line++;
 116       cur_line_no++;
 117     }
 118
 119   return true;
 120 }
 121
 122
 123 /* Answer whether the source is currently displayed in the source
 124    window.  */
 125 bool
 126 tui_source_window::showing_source_p (const char *fullname) const
 127 {
 128   return (!content.empty ()
 129           && (filename_cmp (tui_locator_win_info_ptr ()->full_name.c_str (),
 130                             fullname) == 0));
 131 }
 132
 133
 134 /* Scroll the source forward or backward vertically.  */
 135 void
 136 tui_source_window::do_scroll_vertical (int num_to_scroll)
 137 {
 138   if (!content.empty ())
 139     {
 140       struct tui_line_or_address l;
 141       struct symtab *s;
 142       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 143
 144       if (cursal.symtab == NULL)
 145         s = find_pc_line_symtab (get_frame_pc (get_selected_frame (NULL)));
 146       else
 147         s = cursal.symtab;
 148
 149       l.loa = LOA_LINE;
 150       l.u.line_no = start_line_or_addr.u.line_no
 151         + num_to_scroll;
 152       const std::vector<off_t> *offsets;
 153       if (g_source_cache.get_line_charpos (s, &offsets)
 154           && l.u.line_no > offsets->size ())
 155         /* line = s->nlines - win_info->content_size + 1; */
 156         /* elz: fix for dts 23398.  */
 157         l.u.line_no = start_line_or_addr.u.line_no;
 158       if (l.u.line_no <= 0)
 159         l.u.line_no = 1;
 160
 161       print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0);
 162     }
 163 }
 164
 165 bool
 166 tui_source_window::location_matches_p (struct bp_location *loc, int line_no)
 167 {
 168   return (content[line_no].line_or_addr.loa == LOA_LINE
 169           && content[line_no].line_or_addr.u.line_no == loc->line_number
 170           && loc->symtab != NULL
 171           && filename_cmp (m_fullname.get (),
 172                            symtab_to_fullname (loc->symtab)) == 0);
 173 }
 174
 175 /* See tui-source.h.  */
 176
 177 bool
 178 tui_source_window::line_is_displayed (int line) const
 179 {
 180   bool is_displayed = false;
 181   int threshold = SCROLL_THRESHOLD;
 182   int i = 0;
 183   while (i < content.size () - threshold && !is_displayed)
 184     {
 185       is_displayed
 186         = (content[i].line_or_addr.loa == LOA_LINE
 187            && content[i].line_or_addr.u.line_no == line);
 188       i++;
 189     }
 190
 191   return is_displayed;
 192 }
 193
 194 void
 195 tui_source_window::maybe_update (struct frame_info *fi, symtab_and_line sal)
 196 {
 197   int start_line = (sal.line - (viewport_height / 2)) + 1;
 198   if (start_line <= 0)
 199     start_line = 1;
 200
 201   bool source_already_displayed = (sal.symtab != 0
 202                                    && showing_source_p (m_fullname.get ()));
 203
 204   struct tui_line_or_address l;
 205
 206   l.loa = LOA_LINE;
 207   l.u.line_no = start_line;
 208   if (!(source_already_displayed && line_is_displayed (sal.line)))
 209     update_source_window (get_frame_arch (fi), sal.symtab, l);
 210   else
 211     {
 212       l.u.line_no = sal.line;
 213       set_is_exec_point_at (l);
 214     }
 215 }