tb — Apollo

2.0;tb (traceback), revision 2.0, 81/07/01
TB (TRACEBACK) -- Print traceback after a fault.
usage:  TB


FORMAT

  TB


  TB  prints  a  traceback  after a fault.  The traceback lists the names of the
  routines leading from the fault back to the main  program,  and  includes  the
  line  number  at  which each routine was called.  Up to 32 levels of calls can
  appear.  If the sequence exceeds 32 calls, the first 16 and last 16 are  shown
  in the traceback.

  TB requires no arguments or options.

  NOTE: There  is  a  homonymous  DM  command:  TB -- To bottom of window.  Type
        HELP TB_DM for details about that command.


EXAMPLES

  The traceback from a floating-point error might resemble the following:

      $ TB
      overflow in multiply (from library/floating point)
      In routine "EXTRAPOLATE" line 25
      Called from "REFLECTION" line 192
      Called from "$MAIN" line 19
      $

  In this example, an overflow error occurred in a floating-point multiplication
  at line 25 of the routine named EXTRAPOLATE.    The  routine  EXTRAPOLATE  was
  called at line 192 of the routine REFLECTION, which in turn was called at line
  19 of the main program.
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