Index of Section 1 Manual Pages
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XXGDB(1.08) MISC. REFERENCE MANUAL PAGES XXGDB(1.08)
NAME
xxgdb - X window system interface to the gdb debugger.
SYNOPSIS
xxgdb [ -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 struc-
tures, 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.
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.
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"
-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) ").
-nx Do not execute .gdbinit file.
-bigicon
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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 com-
mands which are invoked by simply click-
ing the LEFT mouse button.
Dialogue Window Provide a typing interface to gdb.
Display Window Provide a window for displaying vari-
ables each time execution stops.
Popup Windows Provide windows for displaying variables
(see "Displaying C Data Structures"
below).
The relative sizes of the source window, command window, and
the dialogue 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 positions the caret and updates
the line label accordingly.
C expression selection is based on the resource delimiters
which determines the set of characters that delimits a C
expression. (The default word selection behavior in the
Athena text widget selects a word delimited by white
spaces.) Text selection adjustment is possible by holding
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 pressing the RIGHT mouse button scrolls the text
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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.
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 func-
tion 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 func-
tion selected. To set a breakpoint in the pro-
gram, 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 break-
point 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.
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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 "Displaying C Data Structures" below)
print * Print the value of the object the selected expres-
sion 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 exe-
cution stops.
undisplay Stop displaying the value of the selected expres-
sion 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 carriage return after entering the
search string will begin a forward 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 displayed, to select an executable file to
debug, or to select a core file to debug. Directory
entries are marked with a trailing slash (`/') and exe-
cutables 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 (>>)
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and reverse (<<) search of text strings in the source
file. Hitting carriage return after entering the
search string will begin a forward 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 hierarchies 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)
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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 fol-
lowing application-specific resources for user customiza-
tion. 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. ("
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!%^&*()+=~|;:{},/#X(1), gdb(1)
COPYRIGHT
Copyright 1989 The University of Texas at Austin. Copyright
1990 Microelectronics and Computer Technology Corporation.
Copyright 1990-1993 Thomson Consumer Electronics, Inc.
AUTHOR
Po Cheung. Pierre Willard.
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