XXGDB(1.10) XXGDB(1.10)
NAMExxgdb - X window system interface to the gdb debugger.
SYNOPSISxxgdb [ -toolkitoption ... ] [-xxgdboption ... ] [-gdboption ... ]
[objfile [ corefile ]]
DESCRIPTION
Xxgdb is a graphical user interface to the gdb debugger under the X
Window System. It provides visual feedback and mouse input for the
user to control program execution through breakpoints, to examine and
traverse the function call stack, to display values of variables and
data structures, and to browse source files and functions.
Xxgdb allows initial gdb commands stored in the file .gdbinit to be
executed immediately after the symbolic information is read. If
.gdbinit does not exist in the current directory, the user's home
directory is searched (~/.gdbinit). Option -nx can be used to prevent
xxgdb from executing this file. Option -i can be used to change the
file name of command file.
Objfile is an object file produced by a compiler with the appropriate
option (-g) specified to produce symbol table information for gdb.
If a file named core exists in the current directory or a corefile is
specified, xxgdb can be used to examine the state of the program when
the core dump occurred.
The name of the debugger invoked by xxgdb is, by default, gdb, but it
can be overridden with the environment variable XXGDB_DEBUGGER or with
the db_name option. Additionally, the prompt string can be overridden
with the environment variable XXGDB_DBXPROMPT or with the db_prompt
option.
OPTIONS
Xxgdb accepts all of the standard X Toolkit command line options (see
X(1)), and all the gdb options (see gdb(1)), plus the following xxgdb
specific options:
-db_name
Specify the name of the debugger to override the default "gdb".
WARNING : by default prompt is the name of the debugger enclosed
in parenthesis followed by a space. So if the prompt is still
"(gdb) ", you HAVE TO use -db_prompt "gdb"
-db_prompt
Specify to xxgdb what is the debugger prompt. The default is to
expect the prompt to be the name of the debugger enclosed in
parenthesis followed by a space (eg, "(gdb) ").
-i Specify the filename of initial gdb command file. The default is
".gdbinit".
-nx Do not execute .gdbinit file (or file specified with -i)
-bigicon
Uses a 64x64 icon instead of the default 48x48 icon.
SUBWINDOWS
Xxgdb consists of the following subwindows:
File Window Display the full pathname of the file displayed in
the source window, and the line number of the
caret.
Source Window Display the contents of a source file.
Message Window Display the execution status and error messages of
xxgdb .
Command Window Provide a list of the common gdb commands which are
invoked by simply clicking the LEFT mouse button.
Dialogue Window Provide a typing interface to gdb.
Display Window Provide a window for displaying variables each time
execution stops.
Popup Windows Provide windows for displaying variables (see "Dis‐
playing C Data Structures" below).
The relative sizes of the source window, command window, and the dia‐
logue window can be adjusted by dragging the grip (a small square near
the right edge of a horizontal border) with the LEFT mouse button down.
SELECTION
Text selection in the source window is modified to make it easier to
select C expressions. LEFT mouse button down selects a C expression by
highlighting it in reverse-video. LEFT mouse button down also posi‐
tions the caret and updates the line label accordingly.
C expression selection is based on the resource delimiters which deter‐
mines the set of characters that delimits a C expression. (The default
word selection behavior in the Athena text widget selects a word delim‐
ited by white spaces.) Text selection adjustment is possible by hold‐
ing the LEFT mouse button down and dragging.
A LEFT mouse button click with the SHIFT button down prints the value
of the expression selected.
SCROLLBAR
Pressing the LEFT mouse button scrolls the text forward, whereas press‐
ing the RIGHT mouse button scrolls the text backward. The amount of
scrolling depends on the distance of the pointer button away from the
top of the scrollbar. If the button is pressed at the top of the
scrollbar, only one line of text is scrolled. If the button is pressed
at the bottom of the scrollbar, one screenful of text is scrolled.
Pressing the MIDDLE mouse button changes the thumb position of the
scrollbar. Dragging the MIDDLE mouse button down moves the thumb along
and changes the text displayed.
IOWIN COMMAND
If compiled, with the right option, xxgdb can use a separate io window
to talk to gdb, so program output is not confused with gdb output.
Type command 'iowin' in Dialogue Window to create io window. If you get
'Undefined command' error message, then xxgdb was not compiled for that
feature. The program xxgdbiowin is used for this io window.
COMMAND BUTTONS
Execution Commands
run Begin program execution.
cont Continue execution from where it stopped.
next Execute one source line, without stepping into any function
call.
step Execute one source line, stepping into a function if the
source line contains a function call.
finish Continue execution until the selected procedure returns;
the current procedure is used if none is selected.
Breakpoint Commands
break Stop program execution at the line or in the function
selected. To set a breakpoint in the program, place the
caret at the start of the source line or on the function name
and click the break button. A stop sign will appear next to
the source line.
tbreak Set a breakpoint enabled only for one stop. This is the same
as the break button except the breakpoint is automatically
disabled the first time it hit.
delete Remove the breakpoint on the source line selected or the
breakpoint number selected.
show brkpts
Show the current breakpoints (both active and inactive).
Stack Commands
stack Show a stack trace of the functions called.
up Move up one level on the call stack.
down Move down one level on the call stack.
Data Display Commands
print Print the value of a selected expression. (also see "Display‐
ing C Data Structures" below)
print * Print the value of the object the selected expression is
pointing to. (also see "Displaying C Data Structures" below)
display Display the value of a selected expression in the display
window, updating its value every time execution stops.
undisplay Stop displaying the value of the selected expression in the
display window. If the selected expression is a constant, it
refers to the display number associated with an expression in
the display window.
args Print the arguments of the selected frame.
show display
Show the names of currently displayed expressions. .IP
"locals" Print the local variables of the selected frame.
stack Print a backtrace of the entire stack.
Miscellaneous Commands
search Pop up a search panel which allows both forward (>>) and reverse
(<<) search of text strings in the source file. Hitting car‐
riage return after entering the search string will begin a for‐
ward search and pop down the search panel.
file Pop up a directory browser that allows the user to move up and
down in the directory tree, to select a text file to be dis‐
played, to select an executable file to debug, or to select a
core file to debug. Directory entries are marked with a trail‐
ing slash (`/') and executables with a trailing asterisk (`*').
Filenames beginning with a dot (`.') or ending with a tilde
(`~') are not listed in the menu.
search Pop up a search panel which allows both forward (>>) and reverse
(<<) search of text strings in the source file. Hitting car‐
riage return after entering the search string will begin a for‐
ward search and pop down the search panel.
yes Send 'y' (yes) to gdb. To be used when gdb requires a yes/no
response.
no Send 'n' (no) to gdb. To be used when gdb requires a yes/no
response.
quit Exit xxgdb.
Displaying C Data Structures
Xxgdb provides some primitive support for graphically displaying C
structures and the ability of following pointers. Pressing the RIGHT
mouse button on the print (or print *) command button displays the
value of the selected expression (or the value the selected expression
is pointing to) in a popup. If the value is a pointer or a structure
containing pointers, the user can examine the value of the object that
pointer is pointing to by clicking the pointer value. This will create
another popup that displays the object the pointer points to. Clicking
the label of the popup pops down itself and all of its descendants.
X DEFAULTS
To change the default values of widget resources used in xxgdb, you
need to reference the widgets by name or by class. The widget hierar‐
chies for the main window, the file menu, the search dialog box, and
the popup data display used in xxgdb are shown as follows, with the
name of the widget followed by the name of its class in parentheses:
Main window:
toplevel (ToplevelShell)
vpane (Paned)
fileWindow (Form)
fileLabel (Label)
lineLabel (Label)
sourceForm (Form)
sourceWindow (AsciiText)
messageWindow (Label)
commandWindow (Box)
run (Command)
cont (Command)
next (Command)
step (Command)
finish (Command)
break (Command)
tbreak (Command)
delete (Command)
up (Command)
down (Command)
print (Command)
print * (Command)
display (Command)
undisplay (Command)
args (Command)
locals (Command)
stack (Command)
search (Command)
file (Command)
show display (Command)
show brkpts (Command)
yes (Command)
no (Command)
quit (Command)
dialogWindow (AsciiText)
displayWindow (AsciiText)
File menu:
File Directory (TransientShell)
popup (Paned)
fileMenuLabel (Label)
fileMenu (List)
cancelButton (Command)
Search dialog box:
Search (TransientShell)
searchPopup (Dialog)
<< (Command)
>> (Command)
DONE (Command)
Data display popup:
Data Popup (TransientShell)
popup (Form)
label (Label)
dataDpyWindow (AsciiText)
In addition to the standard X resources, xxgdb uses the following
application-specific resources for user customization. The value in
parentheses is the default value.
bell If True, the bell is on. (True)
displayWindow
If True, the display window appears on start up. (False)
delimiters
The set of delimiters for word selection. ("
!%^&*()+=~|;:{},/#<?
stop_color
Color of the stop sign. (Red)
arrow_color
Color of the arrow sign. (Blue)
updown_color
Color of the updown sign. (Blue)
bomb_color
Color of the bomb sign. (Red)
dataDpyMaxHeight
Maximum height of the data display window. (300)
dataDpyMaxWidth
Maximum width of the data display window. (600)
prompt The prompt string used in xxgdb. ("(xxgdb) ")
db_name
The name of the debugger program. ("gdb")
db_prompt
The prompt string of the debugger program. ("(gdb) ")
gdbinit
The filename of initial command file. (".gdbinit")
nx If True, xxgdb will not execute .gdbinit at start-up. (False)
tabstop
When displaying source code, the width (in spaces) of a tab. (8)
FILES
a.out default object file
core default core file
~/XDbx resources file (or /usr/lib/X11/app-defaults/XDbx)
.gdbinit local initial commands file
~/.gdbinit user's initial commands file
SEE ALSOX(1), gdb(1)COPYRIGHT
Copyright 1989 The University of Texas at Austin. Copyright 1990
Microelectronics and Computer Technology Corporation. Copyright
1990-1994 Thomson Consumer Electronics, Inc.
AUTHOR
Po Cheung. Pierre Willard.
X Version 11 November 1994 XXGDB(1.10)
