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 <ctype.h>
  24 #include "symtab.h"
  25 #include "frame.h"
  26 #include "breakpoint.h"
  27 #include "source.h"
  28 #include "objfiles.h"
  29 #include "filenames.h"
  30 #include "source-cache.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-winsource.h"
  37 #include "tui/tui-source.h"
  38 #include "gdb_curses.h"
  39
  40 /* A helper function for tui_set_source_content that extracts some
  41    source text from PTR.  LINE_NO is the line number; FIRST_COL is the
  42    first column to extract, and LINE_WIDTH is the number of characters
  43    to display.  Returns a string holding the desired text.  */
  44
  45 static std::string
  46 copy_source_line (const char **ptr, int line_no, int first_col,
  47                   int line_width)
  48 {
  49   const char *lineptr = *ptr;
  50
  51   /* Init the line with the line number.  */
  52   std::string result = string_printf ("%-6d", line_no);
  53   int len = result.size ();
  54   len = len - ((len / tui_tab_width) * tui_tab_width);
  55   result.append (len, ' ');
  56
  57   int column = 0;
  58   char c;
  59   do
  60     {
  61       int skip_bytes;
  62
  63       c = *lineptr;
  64       if (c == '\033' && skip_ansi_escape (lineptr, &skip_bytes))
  65         {
  66           /* We always have to preserve escapes.  */
  67           result.append (lineptr, lineptr + skip_bytes);
  68           lineptr += skip_bytes;
  69           continue;
  70         }
  71
  72       ++lineptr;
  73       ++column;
  74
  75       auto process_tab = [&] ()
  76         {
  77           int max_tab_len = tui_tab_width;
  78
  79           --column;
  80           for (int j = column % max_tab_len;
  81                j < max_tab_len && column < first_col + line_width;
  82                column++, j++)
  83             if (column >= first_col)
  84               result.push_back (' ');
  85         };
  86
  87       /* We have to process all the text in order to pick up all the
  88          escapes.  */
  89       if (column <= first_col || column > first_col + line_width)
  90         {
  91           if (c == '\t')
  92             process_tab ();
  93           continue;
  94         }
  95
  96       if (c == '\n' || c == '\r' || c == '\0')
  97         {
  98           /* Nothing.  */
  99         }
 100       else if (c < 040 && c != '\t')
 101         {
 102           result.push_back ('^');
 103           result.push_back (c + 0100);
 104         }
 105       else if (c == 0177)
 106         {
 107           result.push_back ('^');
 108           result.push_back ('?');
 109         }
 110       else if (c == '\t')
 111         process_tab ();
 112       else
 113         result.push_back (c);
 114     }
 115   while (c != '\0' && c != '\n' && c != '\r');
 116
 117   if (c == '\r' && *lineptr == '\n')
 118     ++lineptr;
 119   *ptr = lineptr;
 120
 121   return result;
 122 }
 123
 124 /* Function to display source in the source window.  */
 125 enum tui_status
 126 tui_set_source_content (tui_source_window_base *win_info,
 127                         struct symtab *s,
 128                         int line_no,
 129                         int noerror)
 130 {
 131   enum tui_status ret = TUI_FAILURE;
 132
 133   if (s != NULL)
 134     {
 135       int line_width, nlines;
 136
 137       ret = TUI_SUCCESS;
 138       line_width = win_info->width - 1;
 139       /* Take hilite (window border) into account, when
 140          calculating the number of lines.  */
 141       nlines = (line_no + (win_info->height - 2)) - line_no;
 142
 143       std::string srclines;
 144       if (!g_source_cache.get_source_lines (s, line_no, line_no + nlines,
 145                                             &srclines))
 146         {
 147           if (!noerror)
 148             {
 149               const char *filename = symtab_to_filename_for_display (s);
 150               char *name = (char *) alloca (strlen (filename) + 100);
 151
 152               sprintf (name, "%s:%d", filename, line_no);
 153               print_sys_errmsg (name, errno);
 154             }
 155           ret = TUI_FAILURE;
 156         }
 157       else
 158         {
 159           int cur_line_no, cur_line;
 160           struct tui_locator_window *locator
 161             = tui_locator_win_info_ptr ();
 162           const char *s_filename = symtab_to_filename_for_display (s);
 163
 164           xfree (win_info->title);
 165           win_info->title = xstrdup (s_filename);
 166
 167           xfree (win_info->fullname);
 168           win_info->fullname = xstrdup (symtab_to_fullname (s));
 169
 170           cur_line = 0;
 171           win_info->gdbarch = get_objfile_arch (SYMTAB_OBJFILE (s));
 172           win_info->start_line_or_addr.loa = LOA_LINE;
 173           cur_line_no = win_info->start_line_or_addr.u.line_no = line_no;
 174
 175           const char *iter = srclines.c_str ();
 176           win_info->content.resize (nlines);
 177           while (cur_line < nlines)
 178             {
 179               struct tui_source_element *element
 180                 = &win_info->content[cur_line];
 181
 182               std::string text;
 183               if (*iter != '\0')
 184                 text = copy_source_line (&iter, cur_line_no,
 185                                          win_info->horizontal_offset,
 186                                          line_width);
 187
 188               /* Set whether element is the execution point
 189                  and whether there is a break point on it.  */
 190               element->line_or_addr.loa = LOA_LINE;
 191               element->line_or_addr.u.line_no = cur_line_no;
 192               element->is_exec_point
 193                 = (filename_cmp (locator->full_name,
 194                                  symtab_to_fullname (s)) == 0
 195                    && cur_line_no == locator->line_no);
 196
 197               xfree (win_info->content[cur_line].line);
 198               win_info->content[cur_line].line
 199                 = xstrdup (text.c_str ());
 200
 201               cur_line++;
 202               cur_line_no++;
 203             }
 204           ret = TUI_SUCCESS;
 205         }
 206     }
 207   return ret;
 208 }
 209
 210
 211 /* Function to display source in the source window.  This function
 212    initializes the horizontal scroll to 0.  */
 213 void
 214 tui_show_symtab_source (tui_source_window_base *win_info,
 215                         struct gdbarch *gdbarch, struct symtab *s,
 216                         struct tui_line_or_address line,
 217                         int noerror)
 218 {
 219   win_info->horizontal_offset = 0;
 220   tui_update_source_window_as_is (win_info, gdbarch, s, line, noerror);
 221 }
 222
 223
 224 /* Answer whether the source is currently displayed in the source
 225    window.  */
 226 bool
 227 tui_source_window::showing_source_p (const char *fullname) const
 228 {
 229   return (!content.empty ()
 230           && (filename_cmp (tui_locator_win_info_ptr ()->full_name,
 231                             fullname) == 0));
 232 }
 233
 234
 235 /* Scroll the source forward or backward vertically.  */
 236 void
 237 tui_source_window::do_scroll_vertical (int num_to_scroll)
 238 {
 239   if (!content.empty ())
 240     {
 241       struct tui_line_or_address l;
 242       struct symtab *s;
 243       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 244
 245       if (cursal.symtab == NULL)
 246         s = find_pc_line_symtab (get_frame_pc (get_selected_frame (NULL)));
 247       else
 248         s = cursal.symtab;
 249
 250       l.loa = LOA_LINE;
 251       l.u.line_no = content[0].line_or_addr.u.line_no
 252         + num_to_scroll;
 253       const std::vector<off_t> *offsets;
 254       if (g_source_cache.get_line_charpos (s, &offsets)
 255           && l.u.line_no > offsets->size ())
 256         /* line = s->nlines - win_info->content_size + 1; */
 257         /* elz: fix for dts 23398.  */
 258         l.u.line_no = content[0].line_or_addr.u.line_no;
 259       if (l.u.line_no <= 0)
 260         l.u.line_no = 1;
 261
 262       print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0);
 263     }
 264 }
 265
 266 tui_source_window::tui_source_window ()
 267   : tui_source_window_base (SRC_WIN)
 268 {
 269   gdb::observers::source_styling_changed.attach
 270     (std::bind (&tui_source_window::style_changed, this),
 271      m_observable);
 272 }
 273
 274 tui_source_window::~tui_source_window ()
 275 {
 276   gdb::observers::source_styling_changed.detach (m_observable);
 277 }
 278
 279 void
 280 tui_source_window::style_changed ()
 281 {
 282   if (tui_active && is_visible ())
 283     refill ();
 284 }
 285
 286 bool
 287 tui_source_window::location_matches_p (struct bp_location *loc, int line_no)
 288 {
 289   return (content[line_no].line_or_addr.loa == LOA_LINE
 290           && content[line_no].line_or_addr.u.line_no == loc->line_number
 291           && loc->symtab != NULL
 292           && filename_cmp (fullname,
 293                            symtab_to_fullname (loc->symtab)) == 0);
 294 }
 295
 296 /* See tui-source.h.  */
 297
 298 bool
 299 tui_source_window::line_is_displayed (int line) const
 300 {
 301   bool is_displayed = false;
 302   int threshold = SCROLL_THRESHOLD;
 303   int i = 0;
 304   while (i < content.size () - threshold && !is_displayed)
 305     {
 306       is_displayed
 307         = (content[i].line_or_addr.loa == LOA_LINE
 308            && content[i].line_or_addr.u.line_no == line);
 309       i++;
 310     }
 311
 312   return is_displayed;
 313 }
 314
 315 void
 316 tui_source_window::maybe_update (struct frame_info *fi, symtab_and_line sal,
 317                                  int line_no, CORE_ADDR addr)
 318 {
 319   int start_line = (line_no - (viewport_height / 2)) + 1;
 320   if (start_line <= 0)
 321     start_line = 1;
 322
 323   bool source_already_displayed = (sal.symtab != 0
 324                                    && showing_source_p (fullname));
 325
 326   struct tui_line_or_address l;
 327
 328   l.loa = LOA_LINE;
 329   l.u.line_no = start_line;
 330   if (!(source_already_displayed
 331         && line_is_displayed (line_no)))
 332     tui_update_source_window (this, get_frame_arch (fi),
 333                               sal.symtab, l, TRUE);
 334   else
 335     {
 336       l.u.line_no = line_no;
 337       set_is_exec_point_at (l);
 338     }
 339 }