(gdb.info) Stack

 
 Examining the Stack
 *******************
 
    When your program has stopped, the first thing you need to know is
 where it stopped and how it got there.
 
    Each time your program performs a function call, information about
 the call is generated.  That information includes the location of the
 call in your program, the arguments of the call, and the local
 variables of the function being called.  The information is saved in a
 block of data called a "stack frame".  The stack frames are allocated
 in a region of memory called the "call stack".
 
    When your program stops, the GDB commands for examining the stack
 allow you to see all of this information.
 
    One of the stack frames is "selected" by GDB and many GDB commands
 refer implicitly to the selected frame.  In particular, whenever you
 ask GDB for the value of a variable in your program, the value is found
 in the selected frame.  There are special GDB commands to select
 whichever frame you are interested in.  Selecting a frame
 Selection.
 
    When your program stops, GDB automatically selects the currently
 executing frame and describes it briefly, similar to the `frame'
 command ( Information about a frame Frame Info.).
(gdb.info) Stack

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