Upgrade GDB from 7.4.1 to 7.6.1 on the vendor branch
[dragonfly.git] / contrib / gdb-7 / gdb / tui / tui-source.c
1 /* TUI display source window.
2
3    Copyright (C) 1998-2013 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 "symtab.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-stack.h"
35 #include "tui/tui-winsource.h"
36 #include "tui/tui-source.h"
37
38 #include "gdb_string.h"
39 #include "gdb_curses.h"
40
41 /* Function to display source in the source window.  */
42 enum tui_status
43 tui_set_source_content (struct symtab *s, 
44                         int line_no,
45                         int noerror)
46 {
47   enum tui_status ret = TUI_FAILURE;
48
49   if (s != (struct symtab *) NULL)
50     {
51       FILE *stream;
52       int i, desc, c, line_width, nlines;
53       char *src_line = 0;
54
55       if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS)
56         {
57           line_width = TUI_SRC_WIN->generic.width - 1;
58           /* Take hilite (window border) into account, when
59              calculating the number of lines.  */
60           nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no;
61           desc = open_source_file (s);
62           if (desc < 0)
63             {
64               if (!noerror)
65                 {
66                   const char *filename = symtab_to_filename_for_display (s);
67                   char *name = alloca (strlen (filename) + 100);
68
69                   sprintf (name, "%s:%d", filename, line_no);
70                   print_sys_errmsg (name, errno);
71                 }
72               ret = TUI_FAILURE;
73             }
74           else
75             {
76               if (s->line_charpos == 0)
77                 find_source_lines (s, desc);
78
79               if (line_no < 1 || line_no > s->nlines)
80                 {
81                   close (desc);
82                   printf_unfiltered ("Line number %d out of range; "
83                                      "%s has %d lines.\n",
84                                      line_no,
85                                      symtab_to_filename_for_display (s),
86                                      s->nlines);
87                 }
88               else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0)
89                 {
90                   close (desc);
91                   perror_with_name (symtab_to_filename_for_display (s));
92                 }
93               else
94                 {
95                   int offset, cur_line_no, cur_line, cur_len, threshold;
96                   struct tui_gen_win_info *locator
97                     = tui_locator_win_info_ptr ();
98                   struct tui_source_info *src
99                     = &TUI_SRC_WIN->detail.source_info;
100                   const char *s_filename = symtab_to_filename_for_display (s);
101
102                   if (TUI_SRC_WIN->generic.title)
103                     xfree (TUI_SRC_WIN->generic.title);
104                   TUI_SRC_WIN->generic.title = xstrdup (s_filename);
105
106                   xfree (src->fullname);
107                   src->fullname = xstrdup (symtab_to_fullname (s));
108
109                   /* Determine the threshold for the length of the
110                      line and the offset to start the display.  */
111                   offset = src->horizontal_offset;
112                   threshold = (line_width - 1) + offset;
113                   stream = fdopen (desc, FOPEN_RT);
114                   clearerr (stream);
115                   cur_line = 0;
116                   src->gdbarch = get_objfile_arch (s->objfile);
117                   src->start_line_or_addr.loa = LOA_LINE;
118                   cur_line_no = src->start_line_or_addr.u.line_no = line_no;
119                   if (offset > 0)
120                     src_line = (char *) xmalloc (
121                                            (threshold + 1) * sizeof (char));
122                   while (cur_line < nlines)
123                     {
124                       struct tui_win_element *element
125                         = (struct tui_win_element *)
126                         TUI_SRC_WIN->generic.content[cur_line];
127
128                       /* Get the first character in the line.  */
129                       c = fgetc (stream);
130
131                       if (offset == 0)
132                         src_line = ((struct tui_win_element *)
133                                    TUI_SRC_WIN->generic.content[
134                                         cur_line])->which_element.source.line;
135                       /* Init the line with the line number.  */
136                       sprintf (src_line, "%-6d", cur_line_no);
137                       cur_len = strlen (src_line);
138                       i = cur_len - ((cur_len / tui_default_tab_len ())
139                                      * tui_default_tab_len ());
140                       while (i < tui_default_tab_len ())
141                         {
142                           src_line[cur_len] = ' ';
143                           i++;
144                           cur_len++;
145                         }
146                       src_line[cur_len] = (char) 0;
147
148                       /* Set whether element is the execution point
149                          and whether there is a break point on it.  */
150                       element->which_element.source.line_or_addr.loa =
151                         LOA_LINE;
152                       element->which_element.source.line_or_addr.u.line_no =
153                         cur_line_no;
154                       element->which_element.source.is_exec_point =
155                         (filename_cmp (((struct tui_win_element *)
156                                        locator->content[0])->which_element.locator.full_name,
157                                        symtab_to_fullname (s)) == 0
158                          && cur_line_no == ((struct tui_win_element *)
159                                             locator->content[0])->which_element.locator.line_no);
160                       if (c != EOF)
161                         {
162                           i = strlen (src_line) - 1;
163                           do
164                             {
165                               if ((c != '\n') && (c != '\r') 
166                                   && (++i < threshold))
167                                 {
168                                   if (c < 040 && c != '\t')
169                                     {
170                                       src_line[i++] = '^';
171                                       src_line[i] = c + 0100;
172                                     }
173                                   else if (c == 0177)
174                                     {
175                                       src_line[i++] = '^';
176                                       src_line[i] = '?';
177                                     }
178                                   else
179                                     { /* Store the charcter in the
180                                          line buffer.  If it is a tab,
181                                          then translate to the correct
182                                          number of chars so we don't
183                                          overwrite our buffer.  */
184                                       if (c == '\t')
185                                         {
186                                           int j, max_tab_len
187                                             = tui_default_tab_len ();
188
189                                           for (j = i - ((i / max_tab_len)
190                                                         * max_tab_len);
191                                                j < max_tab_len
192                                                  && i < threshold;
193                                                i++, j++)
194                                             src_line[i] = ' ';
195                                           i--;
196                                         }
197                                       else
198                                         src_line[i] = c;
199                                     }
200                                   src_line[i + 1] = 0;
201                                 }
202                               else
203                                 { /* If we have not reached EOL, then
204                                      eat chars until we do.  */
205                                   while (c != EOF && c != '\n' && c != '\r')
206                                     c = fgetc (stream);
207                                   /* Handle non-'\n' end-of-line.  */
208                                   if (c == '\r' 
209                                       && (c = fgetc (stream)) != '\n' 
210                                       && c != EOF)
211                                     {
212                                        ungetc (c, stream);
213                                        c = '\r';
214                                     }
215                                   
216                                 }
217                             }
218                           while (c != EOF && c != '\n' && c != '\r' 
219                                  && i < threshold 
220                                  && (c = fgetc (stream)));
221                         }
222                       /* Now copy the line taking the offset into
223                          account.  */
224                       if (strlen (src_line) > offset)
225                         strcpy (((struct tui_win_element *)
226                                  TUI_SRC_WIN->generic.content[cur_line])->which_element.source.line,
227                                 &src_line[offset]);
228                       else
229                         ((struct tui_win_element *)
230                          TUI_SRC_WIN->generic.content[
231                           cur_line])->which_element.source.line[0] = (char) 0;
232                       cur_line++;
233                       cur_line_no++;
234                     }
235                   if (offset > 0)
236                     xfree (src_line);
237                   fclose (stream);
238                   TUI_SRC_WIN->generic.content_size = nlines;
239                   ret = TUI_SUCCESS;
240                 }
241             }
242         }
243     }
244   return ret;
245 }
246
247
248 /* elz: This function sets the contents of the source window to empty
249    except for a line in the middle with a warning message about the
250    source not being available.  This function is called by
251    tui_erase_source_contents(), which in turn is invoked when the
252    source files cannot be accessed.  */
253
254 void
255 tui_set_source_content_nil (struct tui_win_info *win_info, 
256                             char *warning_string)
257 {
258   int line_width;
259   int n_lines;
260   int curr_line = 0;
261
262   line_width = win_info->generic.width - 1;
263   n_lines = win_info->generic.height - 2;
264
265   /* Set to empty each line in the window, except for the one which
266      contains the message.  */
267   while (curr_line < win_info->generic.content_size)
268     {
269       /* Set the information related to each displayed line to null:
270          i.e. the line number is 0, there is no bp, it is not where
271          the program is stopped.  */
272
273       struct tui_win_element *element =
274         (struct tui_win_element *) win_info->generic.content[curr_line];
275
276       element->which_element.source.line_or_addr.loa = LOA_LINE;
277       element->which_element.source.line_or_addr.u.line_no = 0;
278       element->which_element.source.is_exec_point = FALSE;
279       element->which_element.source.has_break = FALSE;
280
281       /* Set the contents of the line to blank.  */
282       element->which_element.source.line[0] = (char) 0;
283
284       /* If the current line is in the middle of the screen, then we
285          want to display the 'no source available' message in it.
286          Note: the 'weird' arithmetic with the line width and height
287          comes from the function tui_erase_source_content().  We need
288          to keep the screen and the window's actual contents in
289          synch.  */
290
291       if (curr_line == (n_lines / 2 + 1))
292         {
293           int i;
294           int xpos;
295           int warning_length = strlen (warning_string);
296           char *src_line;
297
298           src_line = element->which_element.source.line;
299
300           if (warning_length >= ((line_width - 1) / 2))
301             xpos = 1;
302           else
303             xpos = (line_width - 1) / 2 - warning_length;
304
305           for (i = 0; i < xpos; i++)
306             src_line[i] = ' ';
307
308           sprintf (src_line + i, "%s", warning_string);
309
310           for (i = xpos + warning_length; i < line_width; i++)
311             src_line[i] = ' ';
312
313           src_line[i] = '\n';
314
315         }                       /* end if */
316
317       curr_line++;
318
319     }                           /* end while */
320 }
321
322
323 /* Function to display source in the source window.  This function
324    initializes the horizontal scroll to 0.  */
325 void
326 tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s,
327                         struct tui_line_or_address line, 
328                         int noerror)
329 {
330   TUI_SRC_WIN->detail.source_info.horizontal_offset = 0;
331   tui_update_source_window_as_is (TUI_SRC_WIN, gdbarch, s, line, noerror);
332 }
333
334
335 /* Answer whether the source is currently displayed in the source
336    window.  */
337 int
338 tui_source_is_displayed (const char *fullname)
339 {
340   return (TUI_SRC_WIN != NULL
341           && TUI_SRC_WIN->generic.content_in_use 
342           && (filename_cmp (((struct tui_win_element *)
343                              (tui_locator_win_info_ptr ())->
344                              content[0])->which_element.locator.full_name,
345                             fullname) == 0));
346 }
347
348
349 /* Scroll the source forward or backward vertically.  */
350 void
351 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction,
352                             int num_to_scroll)
353 {
354   if (TUI_SRC_WIN->generic.content != NULL)
355     {
356       struct tui_line_or_address l;
357       struct symtab *s;
358       tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content;
359       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
360
361       if (cursal.symtab == (struct symtab *) NULL)
362         s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL)));
363       else
364         s = cursal.symtab;
365
366       l.loa = LOA_LINE;
367       if (scroll_direction == FORWARD_SCROLL)
368         {
369           l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no
370             + num_to_scroll;
371           if (l.u.line_no > s->nlines)
372             /* line = s->nlines - win_info->generic.content_size + 1; */
373             /* elz: fix for dts 23398.  */
374             l.u.line_no
375               = content[0]->which_element.source.line_or_addr.u.line_no;
376         }
377       else
378         {
379           l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no
380             - num_to_scroll;
381           if (l.u.line_no <= 0)
382             l.u.line_no = 1;
383         }
384
385       print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0);
386     }
387 }