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      gdb/doc/gdb.texinfo

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gdb/doc/gdb.texinfo
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@ -40,11 +40,12 @@ original English.
@sp 1
@center The GNU Source-Level Debugger
@sp 4
@center Third Edition, GDB version 3.4
@center Third Edition, GDB version 4.0
@sp 1
@center October 1989
@center October 1990
@sp 5
@center Richard M. Stallman
@center (later modifications and additions by Cygnus Support)
@page
@vskip 0pt plus 1filll
Copyright @copyright{} 1988, 1989 Free Software Foundation, Inc.
@ -456,9 +457,12 @@ instance, when debugging GDB with GDB, it is useful to change the prompt
in one of the GDBs so that you tell which one you are talking to.
@table @code
@item set prompt @var{newprompt}
@item set prompt @samp{newprompt}
@kindex set prompt
Directs GDB to use @var{newprompt} as its prompt string henceforth.
Directs GDB to use @samp{newprompt} as its prompt string henceforth.
@kindex show prompt
@item show prompt
Prints the line: Gdb's prompt is: @samp{your-prompt}
@end table
@cindex exiting GDB
@ -469,6 +473,112 @@ of any GDB command that is in progress and return to GDB command level.
It is safe to type @kbd{Ctrl-c} at any time because GDB does not allow
it to take effect until a time when it is safe.
@cindex readline
@cindex command line editing
@cindex history substitution
GDB now reads its input commands via the @code{readline} interface.
This GNU utility provides consistant behaviour for programs which
need to provide a command line interface to the user. From the point
of view of the user, the new gains are @samp{emacs}-style or @samp{vi}-style
inline editing of commands, @samp{csh}-like history substitution,
and a storage and recall of command history across debugging sessions.
You may control the behavior of command line editing in GDB with the
following commands:
@table @code
@kindex set editing
@item set editing
@itemx set editing on
Enable command line editing (enabled by default).
@item set editing off
Disable command line editing.
@kindex set editing-mode
@item set editing-mode @samp{vi}
Use @samp{vi}-style editing, rather than @samp{emacs}-style.
@item set editing-mode @samp{emacs}
Return to use of @samp{emacs}-style.
Users who wish to temporarily to @samp{vi}-style, can use the commands
@kbd{Control-meta-J} or @kbd{ESC-Control-J}.
@table end
@kindex info editing
@item info editing
Display the current settings relating to command line editing, and also
display the last ten commands in the command history.
@item info editing @var{n}
Print ten commands centered on command number @var{n}.
@item info editing +
Print ten commands just after the commands last printed.
@kindex set history file
@item set history file @samp{filename}
Set the name of the GDB command history file to @samp{filename}. This is
the file from which GDB will read an initial command history
list or to which it will write this list when it exits. This list is
accessed through history expansion or through the history
command editing characters listed below. This file defaults to the
value of the environmental variable @code{GDBHISTFILE}, or to
@code{./.gdb_history} if this variable is not set.
@kindex set history write
@item set history write
@itemx set history write on
Enable the writing of the command history to the command history file
named above. This is enabled by default.
@item set history write off
Disable the writing of the command history to the command history file.
@kindex set history size
@item set history size @var{size}
Set the number of commands which GDB will keep in its history list.
This defaults to the value of the environmental variable
@code{HISTSIZE}, or to 256 if this variable is not set.
@cindex history expansion
Because of the additional meaning of @code{!} to GDB (as the
logical not operator in C), history expansion is off by default. If you
decide to enable history expansion with the @samp{set history expansion
on} command, you will need to follow @samp{!} with a space or a tab to
prevent it from being expanded.
The commands to control history expansion are:
@table @code
@kindex set history expansion
@item set history expansion on
@itemx set history expansion
Enable history expansion.
@item set history expansion off
Disable history expansion. History expansion is off by default.
@end table
The @code{readline} code comes with more complete documentation of
editing and history expansion features. Users unfamiliar with @samp{emacs}
or @samp{vi} may wish to read it. It is available as appendix A and
appendix B of this documentation.
Occasionally it is useful to execute a shell command from within GDB.
This can be done with the @samp{shell} command.
@table @code
@item shell @var{shell command string}
@kindex shell
@cindex shell escape
Directs GDB to invoke an inferior shell to execute @var{shell command string}.
The environment variable @code{SHELL} is used if it exists, otherwise GDB
uses @samp{/bin/sh}.
@cindex screen size
@cindex pauses in output
Certain commands to GDB may produce large amounts of information output
@ -477,20 +587,22 @@ input at the end of each page of output. Type @key{RET} when you want
to continue the output. Normally GDB knows the size of the screen from
on the termcap data base together with the value of the @code{TERM}
environment variable; if this is not correct, you can override it with
the @samp{set screensize} command:
the @samp{set screen-height} and @samp{set screen-width} commands:
@table @code
@item set screensize @var{lpp}
@itemx set screensize @var{lpp} @var{cpl}
@kindex set screensize
Specify a screen height of @var{lpp} lines and (optionally) a width of
@var{cpl} characters. If you omit @var{cpl}, the width does not change.
@item set screen-height @var{lpp}
@item set screen-width @var{cpl}
@kindex set screen-height
@kindex set screen-width
Specify a screen height of @var{lpp} lines and a screen width of
@var{cpl} characters.
If you specify a height of zero lines, GDB will not pause during output
no matter how long the output is. This is useful if output is to a file
or to an editor buffer.
@end table
Also, GDB may at times produce more information about its own workings
than is of interest to the user. Some of these informational messages
can be turned on and off with the @samp{set verbose} command:
@ -646,6 +758,29 @@ auto-display expressions. This is because they may contain pointers to the
internal data recording symbols and data types, which are part of the old
symbol table data being discarded inside GDB.
@kindex shared-library
@kindex share
@cindex shared libraries
GDB can now support Sun's shared library format. Symbols from a shared
library cannot be referenced before the shared library has been linked
with the program. (That is to say, after one types @samp{run} and
the function @code{main()} has been entered.)
@item sharedlibrary @samp{regex}
@itemx share @samp{regex}
Load shared object library symbols for files matching a UNIX regular
expresssion.
@item sharedlibrary
@itemx share
Load symbols for all shared libraries.
@kindex info sharedlibrary
Print the names of the shared libraries which are currently loaded.
@node Compilation, Running, Files, Top
@chapter Compiling Your Program for Debugging
@ -948,6 +1083,7 @@ investigate and find out why.
then you can use GDB to see what is going on.
* Breakpoints:: Breakpoints let you stop your program when it
reaches a specified point in the code.
an expression changes.
* Continuing:: Resuming execution until the next signal or breakpoint.
* Stepping:: Stepping runs the program a short distance and
then stops it wherever it has come to.
@ -1036,7 +1172,7 @@ You can also use the @samp{signal} command to prevent the program from
seeing a signal, or cause it to see a signal it normally would not see,
or to give it any signal at any time. @xref{Signaling}.
@node Breakpoints, Continuing, Signals, Stopping
@node Breakpoints, Watchpoints Continuing, Signals, Stopping
@section Breakpoints
@cindex breakpoints
@ -1063,6 +1199,18 @@ as argument lists only that breakpoint. The convenience variable @code{$_}
and the default examining-address for the @samp{x} command are set to the
address of the last breakpoint listed (@pxref{Memory}).
@cindex watchpoints
A @dfn{watchpoint} is a special breakpoint that stops your program
when the value of an expression
changes. Aside from the different syntax in setting a watchpoint,
it behaves exactly like an other breakpoint and is enabled, disabled,
and deleted exactly like any other breakpoint.
@kindex info watch
@item info watch
This command prints a list of watchpoints.
@menu
* Set Breaks:: How to establish breakpoints.
* Delete Breaks:: How to remove breakpoints no longer needed.
@ -1076,7 +1224,10 @@ address of the last breakpoint listed (@pxref{Memory}).
@subsection Setting Breakpoints
@kindex break
@kindex watch
Breakpoints are set with the @samp{break} command (abbreviated @samp{b}).
Watchpoints are set with the @samp{watch} command.
You have several ways to say where the breakpoint should go.
@table @code
@ -1136,6 +1287,10 @@ Set a breakpoint enabled only for one stop. @var{args} are the
same as in the @samp{break} command, and the breakpoint is set in the same
way, but the breakpoint is automatically disabled the first time it
is hit. @xref{Disabling}.
@kindex watch
@item watch @samp{expr}
Set a watchpoint for an expression.
@end table
GDB allows you to set any number of breakpoints at the same place in the
@ -1145,8 +1300,8 @@ breakpoints are conditional, this is even useful (@pxref{Conditions}).
@node Delete Breaks, Disabling, Set Breaks, Breakpoints
@subsection Deleting Breakpoints
@cindex clearing breakpoint
@cindex deleting breakpoints
@cindex clearing breakpoints and watchpoints
@cindex deleting breakpoints and watchpoints
It is often necessary to eliminate a breakpoint once it has done its job
and you no longer want the program to stop there. This is called
@dfn{deleting} the breakpoint. A breakpoint that has been deleted no
@ -1996,59 +2151,57 @@ this command with as little as @samp{rev}.
@cindex source path
@cindex directories for source files
Executable programs sometimes do not record the directories of the source files
from which they were compiled, just the names. Even when they do, the
directories could be moved between the compilation and your debugging
session. GDB remembers a list of
Executable programs do not record the directories of the source files
from which they were compiled, just the names. GDB remembers a list of
directories to search for source files; this is called the @dfn{source
path}. Each time GDB wants a source file, it tries all the directories
in the list, in the order they are present in the list, until it finds a
file with the desired name. @b{Note that the executable search path is
@i{not} used for this purpose. Neither is the current working
directory, unless it happens to be in the source path.}
If it can't find a source file in the source path, and the object program
records what directory it was compiled in, GDB tries that directory too.
If the source path is empty, and there is no record of the compilation
directory, GDB will, as a last resort, look in the current directory.
Whenever you reset or rearrange the source path, GDB will clear out
any information it has cached about where source files are found, where
each line is in the file, etc.
directory, unless it happens to be in the source path.}
@kindex directory
When you start GDB, its source path is empty.
To add other directories, use the @samp{directory} command.
When you start GDB, its source path contains just the current working
directory. To add other directories, use the @samp{directory} command.
@table @code
@item directory @var{dirnames...}
Add directory @var{dirname} to the front of the source path. Several
Add directory @var{dirname} to the end of the source path. Several
directory names may be given to this command, separated by whitespace or
@samp{:}. If a name is already in the source path, it is moved to the
front of the path, so it will be searched sooner.
@samp{:}.
@item directory
Reset the source path to empty again. This requires confirmation.
Reset the source path to just the current working directory of GDB.
This requires confirmation.
Since this command deletes directories from the search path, it may
change the directory in which a previously read source file will be
discovered. To make this work correctly, this command also clears out
the tables GDB maintains about the source files it has already found.
@item info directories
@kindex info directories
Print the source path: show which directories it contains.
@end table
Because the @samp{directory} command adds to the front of the source path,
it can affect files that GDB has already found. If the source
Because the @samp{directory} command adds to the end of the source path,
it does not affect any file that GDB has already found. If the source
path contains directories that you do not want, and these directories
contain misleading files with names matching your source files, the
way to correct the situation is as follows:
@enumerate
@item
Use @samp{directory} with no argument to reset the source path to empty.
Choose the directory you want at the beginning of the source path.
Use the @samp{cd} command to make that the current working directory.
@item
Use @samp{directory} with no argument to reset the source path to just
that directory.
@item
Use @samp{directory} with suitable arguments to add any other
directories you want in the source path. You can add all the directories
in one command.
directories you want in the source path.
@end enumerate
@node Data, Symbols, Source, Top
@ -2219,6 +2372,38 @@ If GDB is printing a large array, it will stop printing after it has
printed the number of elements set by the @samp{set array-max} command.
This limit also applies to the display of strings.
@item set arrayprint
@itemx set arrayprint on
@kindex set arrayprint
GDB will pretty print arrays. This format is more convenient to read,
but uses more space. The default is off.
@item set arrayprint off.
Return to compressed format for arrays.
@item set vtblprint
@itemx set vtblprint on
@kindex set vtbprint
Pretty print C++ virtual function tables. The default is off.
@item set vtblprint off
Do not pretty print C++ virtual arrays.
@item set addressprint
@item set adressprint on
@kindex set addressprint
GDB will print memory addresses in stack traces and structure values.
The default is on.
@item set addressprint off
Do not print addresses.
GDB will pretty print C++ virtual function tables. The default is off.
@item set vtblprint off
Do not pretty print C++ virtual function tables.
@item set prettyprint on
@kindex set prettyprint
Cause GDB to print structures in an indented format with one member per
@ -2849,16 +3034,6 @@ Print the names and data types of all variables (except for local
variables) whose names contain a match for regular expression
@var{regexp}.
@ignore
Uncomment this only if the implementation is fixed.
@item info types
@kindex info types
Print all data types that are defined in the program.
@item info types @var{regexp}
Print all data types that are defined in the program whose names
contain a match for regular expression @var{regexp}.
@end ignore
@ignore
This was never implemented.
@ -3368,6 +3543,15 @@ communicates with Emacs in terms of line numbers. If you add or
delete lines from the text, the line numbers that GDB knows will cease
to correspond properly to the code.
@kindex emacs epoch environment
@kindex epoch
@kindex inspect
Version 18 of Emacs has a built-in window system called the @samp{epoch}
environment. Users of this environment can use a new command,
@samp{inspect} which performs identically to @samp{print} except that
each value is printed in its own window.
@node Remote, Commands, Emacs, Top
@chapter Remote Kernel Debugging
@ -3415,84 +3599,9 @@ step and continue the remote program.
To resume the remote program and stop debugging it, use the @samp{detach}
command.
@ignore
This material will be merged in when better Readline documentation
is done.
@node GDB Readline, History Top ,Readline Top, Command Editing
@subsection GDB Readline
You may control the behavior of command line editing in GDB with the
following commands:
@table @code
@kindex set editing
@item set editing
@itemx set editing on
Enable command line editing (enabled by default).
@item set editing off
Disable command line editing.
@kindex set history file
@item set history file @var{filename}
Set the name of the GDB command history file to @var{filename}. This is
the file from which GDB will read an initial command history
list or to which it will write this list when it exits. This list is
accessed through history expansion or through the history
command editing characters listed below. This file defaults to the
value of the environmental variable @code{GDBHISTFILE}, or to
@code{./.gdb_history} if this variable is not set.
@kindex set history write
@item set history write
@itemx set history write on
Enable the writing of the command history to the command history file
named above. This is enabled by default.
@item set history write off
Disable the writing of the command history to the command history file.
@kindex set history size
@item set history size @var{size}
Set the number of commands which GDB will keep in its history list.
This defaults to the value of the environmental variable
@code{HISTSIZE}, or to 256 if this variable is not set.
@kindex info editing
@item info editing
Display the current settings relating to command line editing, and also
display the last ten commands in the command history.
@item info editing @var{n}
Print ten commands centered on command number @var{n}.
@item info editing +
Print ten commands just after the commands last printed.
@end table
@node GDB History, , History Top, Command editing
@comment node-name, next, previous, up
Note that because of the additional meaning of @code{!} to GDB (as the
logical not operator in C), history expansion is off by default. If you
decide to enable history expansion with the @samp{set history expansion
on} command, you will need to follow @samp{!} with a space or a tab to
prevent it from being expanded.
The commands to control history expansion are:
@table @code
@kindex set history expansion
@item set history expansion on
@itemx set history expansion
Enable history expansion.
@item set history expansion off
Disable history expansion. History expansion is off by default.
@end table
@end ignore
HOW DO I GET AN APPENDIX, labelled as such in TEX!!!
Fox's readline inc docs should go here.
@node Commands, Concepts, Remote, Top
@unnumbered Command Index
@ -3506,18 +3615,3 @@ Disable history expansion. History expansion is off by default.
@contents
@bye
Occasionally it is useful to execute a shell command from within GDB.
This can be done with the @samp{shell} command.
@table @code
@item shell @var{shell command string}
@kindex shell
@cindex shell escape
Directs GDB to invoke an inferior shell to execute @var{shell command string}.
The environment variable @code{SHELL} is used if it exists, otherwise GDB
uses @samp{/bin/sh}.
@end table

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