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pmgdb
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display.cc
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C/C++ Source or Header
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1996-09-11
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/* display.cc
Copyright (c) 1996 Eberhard Mattes
This file is part of pmgdb.
pmgdb is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
pmgdb is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with pmgdb; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define INCL_WIN
#include <os2.h>
#include <stdlib.h>
#include <stdio.h> // sprintf()
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include "string.h"
#include "pmapp.h"
#include "pmframe.h"
#include "pmtxt.h"
#include "pmtty.h"
#include "pmgdb.h"
#include "help.h"
#include "breakpoi.h"
#include "display.h"
#include "annotati.h"
#include "capture.h"
#include "gdbio.h"
#include "command.h"
class dispfmt
{
public:
dispfmt () { count = 1; format = 0; size = 0; }
~dispfmt () {}
void parse (const char *str);
void print (char *str) const;
int count;
char format;
char size;
};
class display_window::display
{
public:
display () { enable = true; type = not_set; }
display (const display &src);
~display () {}
bool is_line (int y) { return line <= y && y < line + line_count; }
void set_type (gdbio *gdb);
display &operator = (const display &src);
// Dialog box
MRESULT display_msg (HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2);
vstring expr;
vstring format;
vstring value;
display *next;
int number;
int line;
int line_count;
enum
{
not_set,
pointer,
other,
} type;
bool enable;
};
void dispfmt::parse (const char *s)
{
count = 1; size = 0; format = 0;
s = strchr (s, '/');
s = s != NULL ? s + 1 : "";
if (*s >= '0' && *s <= '9')
{
count = atoi (s);
while (*s >= '0' && *s <= '9')
++s;
}
while (*s != 0)
if (*s == 'b' || *s == 'h' || *s == 'w' || *s == 'g')
size = *s++;
else if (*s >= 'a' && *s <= 'z')
format = *s++;
else
break;
}
void dispfmt::print (char *str) const
{
if (count != 1 || format != 0 || size != 0)
{
if (count != 1)
str += sprintf (str, "/%d", count);
else
*str++ = '/';
if (format != 0)
*str++ = format;
if (size != 0)
*str++ = size;
}
*str = 0;
}
display_window::display::display (const display &src)
{
expr = src.expr;
format = src.format;
value = src.value;
next = NULL;
number = src.number;
line = src.line;
line_count = src.line_count;
enable = src.enable;
}
void display_window::display::set_type (gdbio *gdb)
{
capture *capt;
capt = gdb->capture_cmd ("whatis %s", (const char *)expr);
if (capt == NULL)
return;
if (capt->error.is_set ())
type = other;
else
{
const char *s = gdb->get_output ();
int len = gdb->get_output ().length ();
while (len > 0 && s[len-1] == '\n')
--len;
if (len > 0 && s[len-1] == '*')
type = pointer;
else
type = other;
}
delete_capture (capt);
}
display_window::display
&display_window::display::operator = (const display &src)
{
expr = src.expr;
format = src.format;
value = src.value;
next = NULL;
number = src.number;
line = src.line;
line_count = src.line_count;
enable = src.enable;
type = src.type;
return *this;
}
static const struct
{
const char *desc;
char chr;
} formats[] =
{
{"Default", 0},
{"Signed decimal", 'd'},
{"Unsigned decimal", 'u'},
{"Hexadecimal", 'x'},
{"Octal", 'o'},
{"Binary", 't'},
{"Character", 'c'},
{"Address", 'a'},
{"Floating point", 'f'},
{"String", 's'},
{"Instruction", 'i'}
};
#define N_FORMATS (sizeof (formats) / sizeof (formats[0]))
MRESULT display_window::display::display_msg (HWND hwnd, ULONG msg,
MPARAM mp1, MPARAM mp2)
{
MRESULT mr;
HWND hwndTemp;
int i;
char fmtstr[40];
switch (msg)
{
case WM_INITDLG:
{
dispfmt fmt;
dlg_sys_menu (hwnd);
WinSetWindowPtr (hwnd, QWL_USER, this);
WinSendDlgItemMsg (hwnd, IDC_ENABLE, BM_SETCHECK,
MPFROMSHORT (enable), NULL);
WinSendDlgItemMsg (hwnd, IDC_EXPR, EM_SETTEXTLIMIT,
MPFROMSHORT (128), 0);
if (!expr.is_null ())
WinSetDlgItemText (hwnd, IDC_EXPR, (PCSZ)expr);
if (!format.is_null ())
fmt.parse (format);
hwndTemp = WinWindowFromID (hwnd, IDC_FORMAT);
for (i = 0; i < (int)N_FORMATS; ++i)
{
WinSendMsg (hwndTemp, LM_INSERTITEM, MPFROMSHORT (i),
MPFROMP (formats[i].desc));
if (formats[i].chr == fmt.format)
WinSendMsg (hwndTemp, LM_SELECTITEM,
MPFROMSHORT (i), MPFROMSHORT (TRUE));
}
if (fmt.format == 0)
WinSendMsg (hwndTemp, LM_SELECTITEM,
MPFROMSHORT (0), MPFROMSHORT (TRUE));
WinSendDlgItemMsg (hwnd, IDC_COUNT, SPBM_SETCURRENTVALUE,
MPFROMLONG (fmt.count), 0);
WinSendDlgItemMsg (hwnd, IDC_COUNT, SPBM_SETLIMITS,
MPFROMLONG (99), MPFROMLONG (1));
break;
}
case WM_CONTROL:
switch (SHORT1FROMMP (mp1))
{
case IDC_FORMAT:
mr = WinSendDlgItemMsg (hwnd, IDC_FORMAT, LM_QUERYSELECTION,
MPFROMSHORT (LIT_FIRST), 0);
i = SHORT1FROMMR (mr);
bool enable_count = (i != LIT_NONE
&& (formats[i].chr == 's'
|| formats[i].chr == 'i'));
WinEnableWindow (WinWindowFromID (hwnd, IDC_COUNT), enable_count);
break;
}
return 0;
case WM_COMMAND:
switch (SHORT1FROMMP (mp1))
{
case DID_OK:
{
dispfmt fmt;
LONG n;
mr = WinSendDlgItemMsg (hwnd, IDC_ENABLE, BM_QUERYCHECK, 0, 0);
enable = (bool)SHORT1FROMMR (mr);
LONG len = WinQueryDlgItemTextLength (hwnd, IDC_EXPR);
expr.set (len);
WinQueryDlgItemText (hwnd, IDC_EXPR, len + 1, (PSZ)expr.modify ());
mr = WinSendDlgItemMsg (hwnd, IDC_FORMAT, LM_QUERYSELECTION,
MPFROMSHORT (LIT_FIRST), 0);
i = SHORT1FROMMR (mr);
if (i != LIT_NONE && i != 0)
{
fmt.format = formats[i].chr;
if (fmt.format == 's' || fmt.format == 'i')
{
mr = WinSendDlgItemMsg (hwnd, IDC_COUNT, SPBM_QUERYVALUE,
MPFROMP (&n),
MPFROM2SHORT (0,
SPBQ_ALWAYSUPDATE));
if (SHORT1FROMMR (mr))
fmt.count = n;
}
fmt.print (fmtstr);
format.set (fmtstr);
}
else
format.set ("");
WinDismissDlg (hwnd, DID_OK);
return 0;
}
}
break;
}
return WinDefDlgProc (hwnd, msg, mp1, mp2);
}
MRESULT EXPENTRY dlg_display (HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2)
{
display_window::display *p;
if (msg == WM_INITDLG)
p = (display_window::display *)((struct pm_create *)PVOIDFROMMP (mp2))->ptr;
else
p = (display_window::display *)WinQueryWindowPtr (hwnd, QWL_USER);
return p->display_msg (hwnd, msg, mp1, mp2);
}
#define DSP_HEADER_LINES 1
display_window::display_window (command_window *in_cmd, gdbio *in_gdb,
unsigned in_id, const SWP *pswp,
const char *fontnamesize)
: pmtxt (in_cmd->get_app (), in_id,
pswp == NULL ? FCF_SHELLPOSITION : 0, pswp, fontnamesize)
{
cmd = in_cmd; gdb = in_gdb;
head = NULL;
sel_line = -1;
exp_number = -1;
sel_attr = get_default_attr ();
set_fg_color (sel_attr, CLR_BLACK);
set_bg_color (sel_attr, CLR_PALEGRAY);
delete_all_displays (true); // Update menu, insert header line
set_title ("pmgdb - Display");
set_keys_help_id (HELP_THR_KEYS);
}
display_window::~display_window ()
{
delete_all_displays (false);
}
void display_window::delete_all_displays (bool init)
{
display *p, *next;
for (p = head; p != NULL; p = next)
{
next = p->next;
delete p;
}
head = NULL;
sel_line = -1;
if (init)
{
delete_all ();
int x = 0;
put (0, x, 4, " No ", false); x += 4;
put_tab (0, x++, false);
put_vrule (0, x++, false);
put (0, x, 5, " Ena ", false); x += 5;
put_tab (0, x++, false);
put_vrule (0, x++, false);
put (0, x, 5, " Fmt ", false); x += 5;
put_tab (0, x++, false);
put_vrule (0, x++, false);
put (0, x, 6, " Expr ", false); x += 6;
put_tab (0, x++, false);
put_vrule (0, x++, false);
put (0, x, 6, " Value", false); x += 6;
underline (0, true, false);
sync ();
menu_enable (IDM_ENABLE, false);
menu_enable (IDM_DISABLE, false);
menu_enable (IDM_MODIFY, false);
menu_enable (IDM_DELETE, false);
menu_enable (IDM_ENABLE_ALL, false);
menu_enable (IDM_DISABLE_ALL, false);
menu_enable (IDM_DELETE_ALL, false);
menu_enable (IDM_REPMENU, false);
menu_enable (IDM_DEREFERENCE, false);
}
}
bool display_window::add (HWND hwnd)
{
bool result = false;
display temp;
pm_create create;
create.cb = sizeof (create);
create.ptr = (void *)&temp;
if (WinDlgBox (HWND_DESKTOP, hwnd, dlg_display, 0, IDD_DISPLAY,
&create) == DID_OK
&& temp.expr[0] != 0)
{
select_line (-1);
capture *capt;
capt = gdb->capture_cmd ("server display %s %s",
(const char *)temp.format,
(const char *)temp.expr);
if (capt != NULL && capt->disp_number.is_set ())
{
int number = capt->disp_number.get ();
if (!temp.enable)
gdb->send_cmd ("server disable display %d", number);
exp_number = number;
exp_line = -1;
exp_enable = temp.enable;
result = true;
}
delete_capture (capt);
}
return result;
}
MRESULT display_window::wm_close (HWND, ULONG, MPARAM, MPARAM)
{
show (false);
return 0;
}
MRESULT display_window::wm_command (HWND hwnd, ULONG msg,
MPARAM mp1, MPARAM mp2)
{
display *p;
switch (SHORT1FROMMP (mp1))
{
case IDM_ENABLE:
p = find_by_line (sel_line);
if (p == NULL)
WinAlarm (HWND_DESKTOP, WA_ERROR);
else
gdb->send_cmd ("server enable display %d", p->number);
return 0;
case IDM_DISABLE:
p = find_by_line (sel_line);
if (p == NULL)
WinAlarm (HWND_DESKTOP, WA_ERROR);
else
gdb->send_cmd ("server disable display %d", p->number);
return 0;
case IDM_DELETE:
p = find_by_line (sel_line);
if (p == NULL)
WinAlarm (HWND_DESKTOP, WA_ERROR);
else
gdb->send_cmd ("server undisplay %d", p->number);
return 0;
case IDM_ADD:
add (hwnd);
return 0;
case IDM_MODIFY:
p = find_by_line (sel_line);
if (p == NULL)
WinAlarm (HWND_DESKTOP, WA_ERROR);
else
modify (p);
return 0;
case IDM_ENABLE_ALL:
gdb->send_cmd ("server enable display");
return 0;
case IDM_DISABLE_ALL:
gdb->send_cmd ("server disable display");
return 0;
case IDM_DELETE_ALL:
gdb->send_cmd ("server undisplay");
delete_all_displays (true); // GDB doesn't send an annotation!
return 0;
case IDM_REP_DEC_S:
change_representation ('d');
return 0;
case IDM_REP_DEC_U:
change_representation ('u');
return 0;
case IDM_REP_HEX:
change_representation ('x');
return 0;
case IDM_REP_OCT:
change_representation ('o');
return 0;
case IDM_REP_BIN:
change_representation ('t');
return 0;
case IDM_REP_ADR:
change_representation ('a');
return 0;
case IDM_REP_CHR:
change_representation ('c');
return 0;
case IDM_REP_FLT:
change_representation ('f');
return 0;
case IDM_REP_STR:
change_representation ('s');
return 0;
case IDM_REP_INS:
change_representation ('i');
return 0;
case IDM_DEREFERENCE:
p = find_by_line (sel_line);
if (p == NULL)
WinAlarm (HWND_DESKTOP, WA_ERROR);
else
dereference (p, false);
return 0;
default:
return cmd->wm_command (hwnd, msg, mp1, mp2);
}
}
bool display_window::wm_user (HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2)
{
if (parent::wm_user (hwnd, msg, mp1, mp2))
return true;
switch (msg)
{
case UWM_MENU:
// TODO: Cache
if (sel_line == -1)
{
menu_enable (IDM_ENABLE, false);
menu_enable (IDM_DISABLE, false);
menu_enable (IDM_MODIFY, false);
menu_enable (IDM_DELETE, false);
menu_enable (IDM_REPMENU, false);
menu_enable (IDM_DEREFERENCE, false);
}
else
{
const display *p = find_by_line (sel_line);
menu_enable (IDM_ENABLE, !p->enable);
menu_enable (IDM_DISABLE, p->enable);
menu_enable (IDM_MODIFY, true);
menu_enable (IDM_DELETE, true);
menu_enable (IDM_REPMENU, true);
// TODO: null pointer
menu_enable (IDM_DEREFERENCE, p->type == display::pointer);
}
menu_enable (IDM_ENABLE_ALL, head != NULL);
menu_enable (IDM_DISABLE_ALL, head != NULL);
menu_enable (IDM_DELETE_ALL, head != NULL);
return true;
default:
return false;
}
}
MRESULT display_window::wm_activate (HWND hwnd, ULONG msg,
MPARAM mp1, MPARAM mp2)
{
if (SHORT1FROMMP (mp1))
cmd->associate_help (get_hwndFrame ());
return WinDefWindowProc (hwnd, msg, mp1, mp2);
}
void display_window::button_event (int line, int column, int tab, int button,
int clicks)
{
if (line >= 0 && column >= 0)
{
// TODO: Context menu
if (button == 1 && clicks == 2 && tab == 1)
{
const display *p = find_by_line (line);
if (p == NULL)
WinAlarm (HWND_DESKTOP, WA_ERROR);
else
gdb->send_cmd ("server %s display %d",
p->enable ? "disable" : "enable", p->number);
}
else if (button == 1 && clicks == 2 && tab >= 2 && tab <= 3)
{
display *p = find_by_line (line);
if (p == NULL)
WinAlarm (HWND_DESKTOP, WA_ERROR);
else
{
select_line (line);
modify (p);
}
}
else if (button == 1 && clicks == 1)
select_line (line, true);
else if (button == 1 && clicks == 2)
select_line (line);
}
else
select_line (-1);
}
display_window::display *display_window::find_by_number (int number)
{
for (display *p = head; p != NULL; p = p->next)
if (p->number == number)
return p;
return NULL;
}
display_window::display *display_window::find_by_line (int line)
{
for (display *p = head; p != NULL; p = p->next)
if (p->is_line (line))
return p;
return NULL;
}
void display_window::enable (int number)
{
display *p = find_by_number (number);
if (p != NULL && !p->enable)
{
p->enable = true;
if (p->line == sel_line)
WinPostMsg (get_hwndClient (), UWM_MENU, 0, 0);
update (p);
}
}
void display_window::disable (int number)
{
display *p = find_by_number (number);
if (p != NULL && p->enable)
{
p->enable = false;
if (p->line == sel_line)
WinPostMsg (get_hwndClient (), UWM_MENU, 0, 0);
update (p);
}
}
void display_window::remove (int number)
{
for (display **patch = &head; *patch != NULL; patch = &(*patch)->next)
if ((*patch)->number == number)
{
display *p = *patch;
for (display *q = (*patch)->next; q != NULL; q = q->next)
q->line -= p->line_count;
if (p->line == sel_line)
{
sel_line = -1;
WinPostMsg (get_hwndClient (), UWM_MENU, 0, 0);
}
delete_lines (p->line, p->line_count, true);
*patch = p->next;
delete p;
return;
}
}
void display_window::update (display *p)
{
char buf[400];
int x = 0, len, line_count, diff;
pmtxt_attr attr;
if (p->line == sel_line)
attr = sel_attr;
else
attr = get_default_attr ();
line_count = 1;
if (p->enable)
for (const char *s = p->value; *s != 0; ++s)
if (*s == '\n')
++line_count;
diff = line_count - p->line_count;
if (diff < 0)
delete_lines (p->line + line_count, -diff, true);
if (diff > 0)
insert_lines (p->line + p->line_count, diff, true);
if (diff != 0)
{
for (display *q = p->next; q != NULL; q = q->next)
q->line += diff;
if (sel_line == p->line)
sel_count = line_count;
else if (sel_line > p->line)
sel_line += diff;
p->line_count = line_count;
}
clear_lines (p->line, line_count, true);
len = snprintf (buf, sizeof (buf), " %d ", p->number);
put (p->line, x, len, buf, attr, true); x += len;
put_tab (p->line, x++, attr, true);
put_vrule (p->line, x++, attr, true);
len = snprintf (buf, sizeof (buf), " %c ", p->enable ? 'y' : 'n');
put (p->line, x, len, buf, attr, true); x += len;
put_tab (p->line, x++, attr, true);
put_vrule (p->line, x++, attr, true);
len = snprintf (buf, sizeof (buf), " %s ", (const char *)p->format);
put (p->line, x, len, buf, attr, true); x += len;
put_tab (p->line, x++, attr, true);
put_vrule (p->line, x++, attr, true);
len = snprintf (buf, sizeof (buf), " %s ", (const char *)p->expr);
put (p->line, x, len, buf, attr, true); x += len;
put_tab (p->line, x++, attr, true);
put_vrule (p->line, x++, attr, true);
if (p->line == sel_line)
set_eol_attr (p->line, sel_attr, true);
if (p->enable)
{
int y = p->line;
const char *s = p->value;
while (*s != 0)
{
const char *nl = strchr (s, '\n');
len = nl != NULL ? nl - s : strlen (s);
if (y != p->line)
{
if (p->line == sel_line)
set_eol_attr (y, sel_attr, true);
for (int i = 0; i < 4; ++i)
{
put_tab (y, x++, attr, true);
put_vrule (y, x++, attr, true);
}
}
put (y, x++, 1, " ", attr, true);
const char *tab;
while ((tab = (const char *)memchr (s, '\t', len)) != NULL)
{
if (tab != s)
{
put (y, x, tab - s, s, attr, true);
x += tab - s; len -= tab - s; s = tab;
}
++s; --len; // Skip TAB
put (y, x++, 1, " ", attr, true);
put_tab (y, x++, attr, true);
}
if (len != 0)
{
put (y, x, len, s, attr, true);
s += len;
}
if (*s != 0)
{
++s; // Skip linefeed
++y; x = 0; // New line
}
}
}
}
void display_window::update (int number, const char *expr, const char *format,
const char *value, bool enable)
{
int undisplay = -1;
display *p = find_by_number (number);
if (value == NULL) value = "";
if (p == NULL)
{
if (exp_number == number && exp_line != -1
&& (p = find_by_line (exp_line)) != NULL)
{
// Modifying a display
undisplay = p->number;
p->line = exp_line;
}
else
{
// New display
if (head == NULL)
{
menu_enable (IDM_ENABLE_ALL, true);
menu_enable (IDM_DISABLE_ALL, true);
menu_enable (IDM_DELETE_ALL, true);
}
display **patch = &head;
int line = DSP_HEADER_LINES;
while (*patch != NULL)
{
line += (*patch)->line_count;
patch = &(*patch)->next;
}
p = new display;
*patch = p;
p->next = NULL;
p->line = line;
p->line_count = 1;
p->enable = true;
}
p->number = number;
p->expr.set (expr);
p->format.set (format);
p->value.set (value);
p->set_type (gdb);
}
else
{
if (number != exp_number && strcmp (value, p->value) == 0)
return;
// TODO: Redraw value only (if only the value changed)
p->value.set (value);
}
// Set the state of a new display before GDB knows about and reports
// the new state
if (number == exp_number)
{
p->enable = exp_enable;
select_line (p->line);
}
if (!enable)
p->enable = false;
exp_number = -1;
if (undisplay != -1)
gdb->send_cmd ("server undisplay %d", undisplay);
update (p);
}
void display_window::select_line (int line, bool toggle)
{
const display *p = line == -1 ? (display *)NULL : find_by_line (line);
line = p != NULL ? p->line : -1; // Normalize
if (toggle && line != -1 && line == sel_line)
line = -1;
if (line != sel_line)
{
if (sel_line != -1)
for (int i = 0; i < sel_count; ++i)
{
put (sel_line + i, 0, max_line_len, get_default_attr (), true);
set_eol_attr (sel_line + i, get_default_attr (), true);
}
if (line != -1)
{
sel_count = p->line_count;
for (int i = 0; i < sel_count; ++i)
{
put (line + i, 0, max_line_len, sel_attr, true);
set_eol_attr (line + i, sel_attr, true);
}
}
sel_line = line;
}
// TODO: Cache
if (line != -1)
{
menu_enable (IDM_ENABLE, !p->enable);
menu_enable (IDM_DISABLE, p->enable);
menu_enable (IDM_MODIFY, true);
menu_enable (IDM_DELETE, true);
menu_enable (IDM_REPMENU, true);
menu_enable (IDM_DEREFERENCE, p->type == display::pointer);
show_line (line, 1, 1);
}
else
{
menu_enable (IDM_ENABLE, false);
menu_enable (IDM_DISABLE, false);
menu_enable (IDM_MODIFY, false);
menu_enable (IDM_DELETE, false);
menu_enable (IDM_REPMENU, false);
menu_enable (IDM_DEREFERENCE, false);
}
}
void display_window::modify (const display *p, const char *new_format,
const char *new_expr, bool new_enable, bool add)
{
select_line (-1);
if (new_format == NULL)
new_format = p->format;
if (new_expr == NULL)
new_expr = p->expr;
capture *capt;
capt = gdb->capture_cmd ("server display %s %s", new_format, new_expr);
if (capt != NULL && capt->disp_number.is_set ())
{
int number = capt->disp_number.get ();
exp_number = number;
exp_enable = new_enable;
exp_line = add ? -1 : p->line;
if (!new_enable)
gdb->send_cmd ("server disable display %d", number);
}
delete_capture (capt);
}
void display_window::change_representation (char fmtchr)
{
display *p = find_by_line (sel_line);
if (p == NULL)
{
WinAlarm (HWND_DESKTOP, WA_ERROR);
return;
}
dispfmt fmt;
fmt.parse (p->format);
if (fmtchr == fmt.format)
return;
fmt.format = fmtchr;
char new_format_buf[20];
fmt.print (new_format_buf);
modify (p, new_format_buf, NULL, p->enable, false);
}
void display_window::modify (display *p)
{
display temp = *p;
pm_create create;
create.cb = sizeof (create);
create.ptr = (void *)&temp;
if (WinDlgBox (HWND_DESKTOP, get_hwndClient (), dlg_display, 0, IDD_DISPLAY,
&create) == DID_OK
&& temp.expr[0] != 0
&& (temp.enable != p->enable
|| strcmp (temp.expr, p->expr) != 0
|| strcmp (temp.format, p->format) != 0))
{
if (strcmp (temp.expr, p->expr) == 0
&& strcmp (temp.format, p->format) == 0)
gdb->send_cmd ("server %s display %d",
temp.enable ? "enable" : "disable", p->number);
else
modify (p, temp.format, temp.expr, temp.enable, false);
}
}
void display_window::dereference (display *p, bool add)
{
astring expr;
expr = "*(";
expr.append (p->expr);
expr.append (")");
modify (p, "", expr, true, add);
}