@menu
* Command Syntax:: How to give commands to @value{GDBN}
+* Command Settings:: How to change default behavior of commands
* Completion:: Command completion
* Command Options:: Command options
* Help:: How to ask @value{GDBN} for help
then fetches the next line relative to the current line from the history
for editing.
+
+@node Command Settings
+@section Command Settings
+@cindex default behavior of commands, changing
+@cindex default settings, changing
+
+Many commands change their behavior according to command-specific
+variables or settings. These settings can be changed with the
+@code{set} subcommands. For example, the @code{print} command
+(@pxref{Data, ,Examining Data}) prints arrays differently depending on
+settings changeable with the commands @code{set print elements
+NUMBER-OF-ELEMENTS} and @code{set print array-indexes}, among others.
+
+You can change these settings to your preference in the gdbinit files
+loaded at @value{GDBN} startup. @xref{Startup}.
+
+The settings can also be changed interactively during the debugging
+session. For example, to change the limit of array elements to print,
+you can do the following:
+@smallexample
+(@value{GDBN}) set print elements 10
+(@value{GDBN}) print some_array
+$1 = @{0, 10, 20, 30, 40, 50, 60, 70, 80, 90...@}
+@end smallexample
+
+The above @code{set print elements 10} command changes the number of
+elements to print from the default of 200 to 10. If you only intend
+this limit of 10 to be used for printing @code{some_array}, then you
+must restore the limit back to 200, with @code{set print elements
+200}.
+
+Some commands allow overriding settings with command options. For
+example, the @code{print} command supports a number of options that
+allow overriding relevant global print settings as set by @code{set
+print} subcommands. @xref{print options}. The example above could be
+rewritten as:
+@smallexample
+(@value{GDBN}) print -elements 10 -- some_array
+$1 = @{0, 10, 20, 30, 40, 50, 60, 70, 80, 90...@}
+@end smallexample
+
+Alternatively, you can use the @code{with} command to change a setting
+temporarily, for the duration of a command invocation.
+
+@table @code
+@kindex with command
+@kindex w @r{(@code{with})}
+@cindex settings
+@cindex temporarily change settings
+@item with @var{setting} [@var{value}] [-- @var{command}]
+@itemx w @var{setting} [@var{value}] [-- @var{command}]
+Temporarily set @var{setting} to @var{value} for the duration of
+@var{command}.
+
+@var{setting} is any setting you can change with the @code{set}
+subcommands. @var{value} is the value to assign to @code{setting}
+while running @code{command}.
+
+If no @var{command} is provided, the last command executed is
+repeated.
+
+If a @var{command} is provided, it must be preceded by a double dash
+(@code{--}) separator. This is required because some settings accept
+free-form arguments, such as expressions or filenames.
+
+For example, the command
+@smallexample
+(@value{GDBN}) with print array on -- print some_array
+@end smallexample
+@noindent
+is equivalent to the following 3 commands:
+@smallexample
+(@value{GDBN}) set print array on
+(@value{GDBN}) print some_array
+(@value{GDBN}) set print array off
+@end smallexample
+
+The @code{with} command is particularly useful when you want to
+override a setting while running user-defined commands, or commands
+defined in Python or Guile. @xref{Extending GDB,, Extending GDB}.
+
+@smallexample
+(@value{GDBN}) with print pretty on -- my_complex_command
+@end smallexample
+
+To change several settings for the same command, you can nest
+@code{with} commands. For example, @code{with language ada -- with
+print elements 10} temporarily changes the language to Ada and sets a
+limit of 10 elements to print for arrays and strings.
+
+@end table
+
@node Completion
@section Command Completion
@item -raw-frame-arguments [@code{on}|@code{off}]
Set whether to print frame arguments in raw form.
Related setting: @ref{set print raw-frame-arguments}.
+
+@item -frame-info @code{auto}|@code{source-line}|@code{location}|@code{source-and-location}|@code{location-and-address}|@code{short-location}
+Set printing of frame information.
+Related setting: @ref{set print frame-info}.
@end table
The optional @var{qualifier} is maintained for backward compatibility.
only if it is a scalar (integer, pointer, enumeration, etc). See command
@kbd{set print frame-arguments} in @ref{Print Settings} for more details
on how to configure the way function parameter values are printed.
+The command @kbd{set print frame-info} (@pxref{Print Settings}) controls
+what frame information is printed.
@cindex optimized out, in backtrace
@cindex function call arguments, optimized out
@cindex printing frame argument values
@cindex print all frame argument values
@cindex print frame argument values for scalars only
-@cindex do not print frame argument values
+@cindex do not print frame arguments
This command allows to control how the values of arguments are printed
when the debugger prints a frame (@pxref{Frames}). The possible
values are:
#1 0x08048361 in call_me (i=@dots{}, s=@dots{}, ss=@dots{}, u=@dots{}, e=@dots{})
at frame-args.c:23
@end smallexample
+
+@item presence
+Only the presence of arguments is indicated by @code{@dots{}}.
+The @code{@dots{}} are not printed for function without any arguments.
+None of the argument names and values are printed.
+In this case, the example above now becomes:
+
+@smallexample
+#1 0x08048361 in call_me (@dots{}) at frame-args.c:23
+@end smallexample
+
@end table
By default, only scalar arguments are printed. This command can be used
Also, it improves performance when displaying Ada frames, because
the computation of large arguments can sometimes be CPU-intensive,
especially in large applications. Setting @code{print frame-arguments}
-to @code{scalars} (the default) or @code{none} avoids this computation,
-thus speeding up the display of each Ada frame.
+to @code{scalars} (the default), @code{none} or @code{presence} avoids
+this computation, thus speeding up the display of each Ada frame.
@item show print frame-arguments
Show how the value of arguments should be displayed when printing a frame.
Show the method being used for printing of frame argument values at function
entry.
+@anchor{set print frame-info}
+@item set print frame-info @var{value}
+@kindex set print frame-info
+@cindex printing frame information
+@cindex frame information, printing
+This command allows to control the information printed when
+the debugger prints a frame. See @ref{Frames}, @ref{Backtrace},
+for a general explanation about frames and frame information.
+Note that some other settings (such as @code{set print frame-arguments}
+and @code{set print address}) are also influencing if and how some frame
+information is displayed. In particular, the frame program counter is never
+printed if @code{set print address} is off.
+
+The possible values for @code{set print frame-info} are:
+@table @code
+@item short-location
+Print the frame level, the program counter (if not at the
+beginning of the location source line), the function, the function
+arguments.
+@item location
+Same as @code{short-location} but also print the source file and source line
+number.
+@item location-and-address
+Same as @code{location} but print the program counter even if located at the
+beginning of the location source line.
+@item source-line
+Print the program counter (if not at the beginning of the location
+source line), the line number and the source line.
+@item source-and-location
+Print what @code{location} and @code{source-line} are printing.
+@item auto
+The information printed for a frame is decided automatically
+by the @value{GDBN} command that prints a frame.
+For example, @code{frame} prints the information printed by
+@code{source-and-location} while @code{stepi} will switch between
+@code{source-line} and @code{source-and-location} depending on the program
+counter.
+The default value is @code{auto}.
+@end table
+
@anchor{set print repeats}
@item set print repeats @var{number-of-repeats}
@itemx set print repeats unlimited
of such variables.
@kindex info types
-@item info types @var{regexp}
-@itemx info types
+@item info types [-q] [@var{regexp}]
Print a brief description of all types whose names match the regular
expression @var{regexp} (or all types in your program, if you supply
no argument). Each complete typename is matched as though it were a
@code{whatis}, it does not print a detailed description; second, it
lists all source files and line numbers where a type is defined.
+The output from @samp{into types} is proceeded with a header line
+describing what types are being listed. The optional flag @samp{-q},
+which stands for @samp{quiet}, disables printing this header
+information.
+
@kindex info type-printers
@item info type-printers
Versions of @value{GDBN} that ship with Python scripting enabled may
@smallexample
-catch-throw -r exception_type
-^done,bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
- addr="0x00000000004006c0",what="exception throw",
- catch-type="throw",thread-groups=["i1"],
+^done,bkpt=@{number="1",type="catchpoint",disp="keep",enabled="y",
+ what="exception throw",catch-type="throw",
+ thread-groups=["i1"],
regexp="exception_type",times="0"@}
(gdb)
-exec-run
@smallexample
-catch-rethrow -r exception_type
-^done,bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
- addr="0x00000000004006c0",what="exception rethrow",
- catch-type="rethrow",thread-groups=["i1"],
+^done,bkpt=@{number="1",type="catchpoint",disp="keep",enabled="y",
+ what="exception rethrow",catch-type="rethrow",
+ thread-groups=["i1"],
regexp="exception_type",times="0"@}
(gdb)
-exec-run
@smallexample
-catch-catch -r exception_type
-^done,bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
- addr="0x00000000004006c0",what="exception catch",
- catch-type="catch",thread-groups=["i1"],
+^done,bkpt=@{number="1",type="catchpoint",disp="keep",enabled="y",
+ what="exception catch",catch-type="catch",
+ thread-groups=["i1"],
regexp="exception_type",times="0"@}
(gdb)
-exec-run
subcommands. This is used by the testsuite to validate completion
support in the command options framework.
-@kindex maint test-settings
-@item maint test-settings set @var{kind}
-@itemx maint test-settings show @var{kind}
+@kindex maint set test-settings
+@kindex maint show test-settings
+@item maint set test-settings @var{kind}
+@itemx maint show test-settings @var{kind}
These are representative commands for each @var{kind} of setting type
@value{GDBN} supports. They are used by the testsuite for exercising
the settings infrastructure.
+
+@kindex maint with
+@item maint with @var{setting} [@var{value}] [-- @var{command}]
+Like the @code{with} command, but works with @code{maintenance set}
+variables. This is used by the testsuite to exercise the @code{with}
+command's infrastructure.
+
@end table
The following command is useful for non-interactive invocations of
projects / deliverable / binutils-gdb.git / blobdiff