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gawk: Debugger Execution Control

 
 14.3.2 Control of Execution
 ---------------------------
 
 Now that your breakpoints are ready, you can start running the program
 and observing its behavior.  There are more commands for controlling
 execution of the program than we saw in our earlier example:
 
 'commands' [N]
 'silent'
 ...
 'end'
      Set a list of commands to be executed upon stopping at a breakpoint
      or watchpoint.  N is the breakpoint or watchpoint number.  Without
      a number, the last one set is used.  The actual commands follow,
      starting on the next line, and terminated by the 'end' command.  If
      the command 'silent' is in the list, the usual messages about
      stopping at a breakpoint and the source line are not printed.  Any
      command in the list that resumes execution (e.g., 'continue')
      terminates the list (an implicit 'end'), and subsequent commands
      are ignored.  For example:
 
           gawk> commands
           > silent
           > printf "A silent breakpoint; i = %d\n", i
           > info locals
           > set i = 10
           > continue
           > end
           gawk>
 
 'continue' [COUNT]
 'c' [COUNT]
      Resume program execution.  If continued from a breakpoint and COUNT
      is specified, ignore the breakpoint at that location the next COUNT
      times before stopping.
 
 'finish'
      Execute until the selected stack frame returns.  Print the returned
      value.
 
 'next' [COUNT]
 'n' [COUNT]
      Continue execution to the next source line, stepping over function
      calls.  The argument COUNT controls how many times to repeat the
      action, as in 'step'.
 
 'nexti' [COUNT]
 'ni' [COUNT]
      Execute one (or COUNT) instruction(s), stepping over function
      calls.
 
 'return' [VALUE]
      Cancel execution of a function call.  If VALUE (either a string or
      a number) is specified, it is used as the function's return value.
      If used in a frame other than the innermost one (the currently
      executing function; i.e., frame number 0), discard all inner frames
      in addition to the selected one, and the caller of that frame
      becomes the innermost frame.
 
 'run'
 'r'
      Start/restart execution of the program.  When restarting, the
      debugger retains the current breakpoints, watchpoints, command
      history, automatic display variables, and debugger options.
 
 'step' [COUNT]
 's' [COUNT]
      Continue execution until control reaches a different source line in
      the current stack frame, stepping inside any function called within
      the line.  If the argument COUNT is supplied, steps that many times
      before stopping, unless it encounters a breakpoint or watchpoint.
 
 'stepi' [COUNT]
 'si' [COUNT]
      Execute one (or COUNT) instruction(s), stepping inside function
      calls.  (For illustration of what is meant by an "instruction" in
      'gawk', see the output shown under 'dump' in Miscellaneous
      Debugger Commands.)
 
 'until' [[FILENAME':']N | FUNCTION]
 'u' [[FILENAME':']N | FUNCTION]
      Without any argument, continue execution until a line past the
      current line in the current stack frame is reached.  With an
      argument, continue execution until the specified location is
      reached, or the current stack frame returns.
 

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