1 /* TUI display source window.
3 Copyright (C) 1998-2019 Free Software Foundation, Inc.
5 Contributed by Hewlett-Packard Company.
7 This file is part of GDB.
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.
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.
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/>. */
26 #include "breakpoint.h"
29 #include "filenames.h"
30 #include "source-cache.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"
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. */
46 copy_source_line (const char **ptr, int line_no, int first_col,
49 const char *lineptr = *ptr;
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, ' ');
64 if (c == '\033' && skip_ansi_escape (lineptr, &skip_bytes))
66 /* We always have to preserve escapes. */
67 result.append (lineptr, lineptr + skip_bytes);
68 lineptr += skip_bytes;
75 auto process_tab = [&] ()
77 int max_tab_len = tui_tab_width;
80 for (int j = column % max_tab_len;
81 j < max_tab_len && column < first_col + line_width;
83 if (column >= first_col)
84 result.push_back (' ');
87 /* We have to process all the text in order to pick up all the
89 if (column <= first_col || column > first_col + line_width)
96 if (c == '\n' || c == '\r' || c == '\0')
100 else if (c < 040 && c != '\t')
102 result.push_back ('^');
103 result.push_back (c + 0100);
107 result.push_back ('^');
108 result.push_back ('?');
113 result.push_back (c);
115 while (c != '\0' && c != '\n' && c != '\r');
117 if (c == '\r' && *lineptr == '\n')
124 /* Function to display source in the source window. */
126 tui_set_source_content (struct symtab *s,
130 enum tui_status ret = TUI_FAILURE;
134 int line_width, nlines;
137 tui_alloc_source_buffer (TUI_SRC_WIN);
138 line_width = TUI_SRC_WIN->width - 1;
139 /* Take hilite (window border) into account, when
140 calculating the number of lines. */
141 nlines = (line_no + (TUI_SRC_WIN->height - 2)) - line_no;
143 std::string srclines;
144 if (!g_source_cache.get_source_lines (s, line_no, line_no + nlines,
149 const char *filename = symtab_to_filename_for_display (s);
150 char *name = (char *) alloca (strlen (filename) + 100);
152 sprintf (name, "%s:%d", filename, line_no);
153 print_sys_errmsg (name, errno);
159 int cur_line_no, cur_line;
160 struct tui_locator_window *locator
161 = tui_locator_win_info_ptr ();
162 struct tui_source_window_base *src
163 = (struct tui_source_window_base *) TUI_SRC_WIN;
164 const char *s_filename = symtab_to_filename_for_display (s);
166 if (TUI_SRC_WIN->title)
167 xfree (TUI_SRC_WIN->title);
168 TUI_SRC_WIN->title = xstrdup (s_filename);
170 xfree (src->fullname);
171 src->fullname = xstrdup (symtab_to_fullname (s));
174 src->gdbarch = get_objfile_arch (SYMTAB_OBJFILE (s));
175 src->start_line_or_addr.loa = LOA_LINE;
176 cur_line_no = src->start_line_or_addr.u.line_no = line_no;
178 const char *iter = srclines.c_str ();
179 while (cur_line < nlines)
181 struct tui_win_element *element
182 = TUI_SRC_WIN->content[cur_line];
186 text = copy_source_line (&iter, cur_line_no,
187 src->horizontal_offset,
190 /* Set whether element is the execution point
191 and whether there is a break point on it. */
192 element->which_element.source.line_or_addr.loa =
194 element->which_element.source.line_or_addr.u.line_no =
196 element->which_element.source.is_exec_point =
197 (filename_cmp (locator->full_name,
198 symtab_to_fullname (s)) == 0
199 && cur_line_no == locator->line_no);
201 xfree (TUI_SRC_WIN->content[cur_line]
202 ->which_element.source.line);
203 TUI_SRC_WIN->content[cur_line]
204 ->which_element.source.line
205 = xstrdup (text.c_str ());
210 TUI_SRC_WIN->content_size = nlines;
218 /* elz: This function sets the contents of the source window to empty
219 except for a line in the middle with a warning message about the
220 source not being available. This function is called by
221 tui_erase_source_contents(), which in turn is invoked when the
222 source files cannot be accessed. */
225 tui_set_source_content_nil (struct tui_win_info *win_info,
226 const char *warning_string)
232 line_width = win_info->width - 1;
233 n_lines = win_info->height - 2;
235 /* Set to empty each line in the window, except for the one which
236 contains the message. */
237 while (curr_line < win_info->content_size)
239 /* Set the information related to each displayed line to null:
240 i.e. the line number is 0, there is no bp, it is not where
241 the program is stopped. */
243 struct tui_win_element *element = win_info->content[curr_line];
245 element->which_element.source.line_or_addr.loa = LOA_LINE;
246 element->which_element.source.line_or_addr.u.line_no = 0;
247 element->which_element.source.is_exec_point = false;
248 element->which_element.source.has_break = FALSE;
250 /* Set the contents of the line to blank. */
251 element->which_element.source.line[0] = (char) 0;
253 /* If the current line is in the middle of the screen, then we
254 want to display the 'no source available' message in it.
255 Note: the 'weird' arithmetic with the line width and height
256 comes from the function tui_erase_source_content(). We need
257 to keep the screen and the window's actual contents in
260 if (curr_line == (n_lines / 2 + 1))
263 int warning_length = strlen (warning_string);
266 if (warning_length >= ((line_width - 1) / 2))
269 xpos = (line_width - 1) / 2 - warning_length;
271 src_line = xstrprintf ("%s%s", n_spaces (xpos), warning_string);
272 xfree (element->which_element.source.line);
273 element->which_element.source.line = src_line;
281 /* Function to display source in the source window. This function
282 initializes the horizontal scroll to 0. */
284 tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s,
285 struct tui_line_or_address line,
288 TUI_SRC_WIN->horizontal_offset = 0;
289 tui_update_source_window_as_is (TUI_SRC_WIN, gdbarch, s, line, noerror);
293 /* Answer whether the source is currently displayed in the source
296 tui_source_is_displayed (const char *fullname)
298 return (TUI_SRC_WIN != NULL
299 && TUI_SRC_WIN->content_in_use
300 && (filename_cmp (tui_locator_win_info_ptr ()->full_name,
305 /* Scroll the source forward or backward vertically. */
307 tui_source_window::do_scroll_vertical (int num_to_scroll)
311 struct tui_line_or_address l;
313 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
315 if (cursal.symtab == NULL)
316 s = find_pc_line_symtab (get_frame_pc (get_selected_frame (NULL)));
321 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no
323 if (l.u.line_no > s->nlines)
324 /* line = s->nlines - win_info->content_size + 1; */
325 /* elz: fix for dts 23398. */
327 = content[0]->which_element.source.line_or_addr.u.line_no;
328 if (l.u.line_no <= 0)
331 print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0);