gdb/tui/tui-source.c

   1 /* TUI display source window.
   2
   3    Copyright (C) 1998-2021 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 "tui/tui-location.h"
  41 #include "gdb_curses.h"
  42
  43 /* Function to display source in the source window.  */
  44 bool
  45 tui_source_window::set_contents (struct gdbarch *arch,
  46                                  const struct symtab_and_line &sal)
  47 {
  48   struct symtab *s = sal.symtab;
  49   int line_no = sal.line;
  50
  51   if (s == NULL)
  52     return false;
  53
  54   /* Take hilite (window border) into account, when
  55      calculating the number of lines.  */
  56   int nlines = height - 2;
  57
  58   std::string srclines;
  59   const std::vector<off_t> *offsets;
  60   if (!g_source_cache.get_source_lines (s, line_no, line_no + nlines,
  61                                         &srclines)
  62       || !g_source_cache.get_line_charpos (s, &offsets))
  63     return false;
  64
  65   int cur_line_no, cur_line;
  66   const char *s_filename = symtab_to_filename_for_display (s);
  67
  68   title = s_filename;
  69
  70   m_fullname = make_unique_xstrdup (symtab_to_fullname (s));
  71
  72   cur_line = 0;
  73   m_gdbarch = SYMTAB_OBJFILE (s)->arch ();
  74   m_start_line_or_addr.loa = LOA_LINE;
  75   cur_line_no = m_start_line_or_addr.u.line_no = line_no;
  76
  77   m_digits = 7;
  78   if (compact_source)
  79     {
  80       /* Solaris 11+gcc 5.5 has ambiguous overloads of log10, so we
  81          cast to double to get the right one.  */
  82       double l = log10 ((double) offsets->size ());
  83       m_digits = 1 + (int) l;
  84     }
  85
  86   m_max_length = -1;
  87   const char *iter = srclines.c_str ();
  88   m_content.resize (nlines);
  89   while (cur_line < nlines)
  90     {
  91       struct tui_source_element *element = &m_content[cur_line];
  92
  93       std::string text;
  94       if (*iter != '\0')
  95         {
  96           int line_len;
  97           text = tui_copy_source_line (&iter, &line_len);
  98           m_max_length = std::max (m_max_length, line_len);
  99         }
 100
 101       /* Set whether element is the execution point
 102          and whether there is a break point on it.  */
 103       element->line_or_addr.loa = LOA_LINE;
 104       element->line_or_addr.u.line_no = cur_line_no;
 105       element->is_exec_point
 106         = (filename_cmp (tui_location.full_name ().c_str (),
 107                          symtab_to_fullname (s)) == 0
 108            && cur_line_no == tui_location.line_no ());
 109
 110       m_content[cur_line].line = std::move (text);
 111
 112       cur_line++;
 113       cur_line_no++;
 114     }
 115
 116   return true;
 117 }
 118
 119
 120 /* Answer whether the source is currently displayed in the source
 121    window.  */
 122 bool
 123 tui_source_window::showing_source_p (const char *fullname) const
 124 {
 125   return (!m_content.empty ()
 126           && (filename_cmp (tui_location.full_name ().c_str (),
 127                             fullname) == 0));
 128 }
 129
 130
 131 /* Scroll the source forward or backward vertically.  */
 132 void
 133 tui_source_window::do_scroll_vertical (int num_to_scroll)
 134 {
 135   if (!m_content.empty ())
 136     {
 137       struct symtab *s;
 138       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 139       struct gdbarch *arch = m_gdbarch;
 140
 141       if (cursal.symtab == NULL)
 142         {
 143           struct frame_info *fi = get_selected_frame (NULL);
 144           s = find_pc_line_symtab (get_frame_pc (fi));
 145           arch = get_frame_arch (fi);
 146         }
 147       else
 148         s = cursal.symtab;
 149
 150       int line_no = m_start_line_or_addr.u.line_no + num_to_scroll;
 151       const std::vector<off_t> *offsets;
 152       if (g_source_cache.get_line_charpos (s, &offsets)
 153           && line_no > offsets->size ())
 154         line_no = m_start_line_or_addr.u.line_no;
 155       if (line_no <= 0)
 156         line_no = 1;
 157
 158       cursal.line = line_no;
 159       find_line_pc (cursal.symtab, cursal.line, &cursal.pc);
 160       for (struct tui_source_window_base *win_info : tui_source_windows ())
 161         win_info->update_source_window_as_is (arch, cursal);
 162     }
 163 }
 164
 165 bool
 166 tui_source_window::location_matches_p (struct bp_location *loc, int line_no)
 167 {
 168   return (m_content[line_no].line_or_addr.loa == LOA_LINE
 169           && m_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   if (m_content.size () < SCROLL_THRESHOLD)
 181     return false;
 182
 183   for (size_t i = 0; i < m_content.size () - SCROLL_THRESHOLD; ++i)
 184     {
 185       if (m_content[i].line_or_addr.loa == LOA_LINE
 186           && m_content[i].line_or_addr.u.line_no == line)
 187         return true;
 188     }
 189
 190   return false;
 191 }
 192
 193 void
 194 tui_source_window::maybe_update (struct frame_info *fi, symtab_and_line sal)
 195 {
 196   int start_line = (sal.line - ((height - 2) / 2)) + 1;
 197   if (start_line <= 0)
 198     start_line = 1;
 199
 200   bool source_already_displayed = (sal.symtab != 0
 201                                    && showing_source_p (m_fullname.get ()));
 202
 203   if (!(source_already_displayed && line_is_displayed (sal.line)))
 204     {
 205       sal.line = start_line;
 206       update_source_window (get_frame_arch (fi), sal);
 207     }
 208   else
 209     {
 210       struct tui_line_or_address l;
 211
 212       l.loa = LOA_LINE;
 213       l.u.line_no = sal.line;
 214       set_is_exec_point_at (l);
 215     }
 216 }
 217
 218 void
 219 tui_source_window::display_start_addr (struct gdbarch **gdbarch_p,
 220                                        CORE_ADDR *addr_p)
 221 {
 222   struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 223
 224   *gdbarch_p = m_gdbarch;
 225   find_line_pc (cursal.symtab, m_start_line_or_addr.u.line_no, addr_p);
 226 }
 227
 228 /* See tui-winsource.h.  */
 229
 230 void
 231 tui_source_window::show_line_number (int offset) const
 232 {
 233   int lineno = m_content[0].line_or_addr.u.line_no + offset;
 234   char text[20];
 235   /* To completely overwrite the previous border when the source window height
 236      is increased, both spaces after the line number have to be redrawn.  */
 237   xsnprintf (text, sizeof (text), "%*d  ", m_digits - 1, lineno);
 238   waddstr (handle.get (), text);
 239 }