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If you have a pointer and you are not sure where it points, try 'set print
symbol-filename on'. Then you can determine the name and source file location
of the variable where it points, using 'p/a pointer'. This interprets the address in
symbolic form. For example, here GDB shows that a variable ptt points at another
variable t, defined in 'hi2.c':
((gdb)) set print symbol-filename on
((gdb)) p/a ptt
$4 = 0xe008 <t in hi2.c>
WARNING! For pointers that point to a local variable, 'p/a' does not show the symbol
name and filename of the referent, even with the appropriate set print options
turned on.
Other settings to control how different kinds of objects are printed:
set print array, set print
array on
Pretty print arrays. This format is more
convenient to read, but uses more space. The
default is off.
set print array off
Return to compressed format for arrays.
show print array
Show whether compressed or pretty format is
selected for displaying arrays.
set print elements
number-of-elements
Set a limit on how many elements of an array
GDB will print. If GDB is printing a large array,
it stops printing after it has printed the number
of elements set by the set print elements
command. This limit also applies to the display
of strings. When GDB starts, this limit is set to
200. Setting number-of-elements to zero
means that the printing is unlimited.
show print elements
Display the number of elements of a large array
that GDB will print. If the number is 0, then the
printing is unlimited.
set print null-stop
Cause GDB to stop printing the characters of an
array when the first NULL is encountered. This
is useful when large arrays actually contain only
short strings. The default is off.
set print pretty on
Cause GDB to print structures in an indented
format with one member per line, like this:
$1 = {
next = 0x0,
flags = {
sweet = 1,
sour = 1
92 Examining Data