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The names where and info stack (abbreviated info s) are additional aliases for
backtrace.
Each line in the backtrace shows the frame number and the function name. The program
counter value is also shown―unless you use set print address off. The backtrace
also shows the source file name and line number, as well as the arguments to the
function. The program counter value is omitted if it is at the beginning of the code for
that line number.
Here is an example of a backtrace. It was made with the command 'bt 3', so it shows
the innermost three frames.
#0 m4_traceon (obs=0x24eb0, argc=1, argv=0x2b8c8)
at builtin.c:993
#1 0x6e38 in expand_macro (sym=0x2b600) at macro.c:242
#2 0x6840 in expand_token (obs=0x0, t=177664, td=0xf7fffb08)
at macro.c:71
(More stack frames follow...)
The display for frame zero does not begin with a program counter value, indicating
that your program has stopped at the beginning of the code for line 993 of builtin.c.
6.5 Selecting a frame
Most commands for examining the stack and other data in your program work on
whichever stack frame is selected at the moment.
The following commands are used for selecting a stack frame; all of them finish by
printing a brief description of the stack frame selected.
frame n, f n Select frame number n. Recall that frame zero is the innermost
(currently executing) frame, frame one is the frame that called the
innermost one, and so on. The highest-numbered frame is the one for
main.
frame addr,
f addr
Select the frame at address addr. This is useful mainly if the chaining
of stack frames has been damaged by a bug, making it impossible for
GDB to assign numbers properly to all frames. In addition, this can
be useful when your program has multiple stacks and switches
between them.
6.5 Selecting a frame 73