Library /sys$common/syshlp/dbg$help.hlb DEBUG, STEP, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The STEP command is one of the four debugger commands that can be
    used to execute your program (the others are CALL, EXIT, and GO).

    The behavior of the STEP command depends on the following
    factors:

    o  The default STEP mode previously established with a SET STEP
       command, if any

    o  The qualifier specified with the STEP command, if any

    o  The number of step units specified as the parameter to the
       STEP command, if any

    If no SET STEP command was previously entered, the debugger
    takes the following default actions when you enter a STEP command
    without specifying a qualifier or parameter:

    1. Executes a line of source code (the default is STEP/LINE).

    2. Reports that execution has completed by issuing a "stepped
       to . . . " message (the default is STEP/NOSILENT).

    3. Displays the line of source code at which execution is
       suspended (the default is STEP/SOURCE).

    4. Issues the prompt.

    The following qualifiers affect the location to which you step:

       /BRANCH
       /CALL
       /EXCEPTION
       /INSTRUCTION
       /INSTRUCTION=(opcode[, . . . ]) (VAX only)
       /LINE
       /RETURN
       /SEMANTIC_EVENT (Alpha only)
       /VECTOR_INSTRUCTION (VAX only)

    The following qualifiers affect what output is seen upon
    completion of a step:

       /[NO]SILENT
       /[NO]SOURCE

    The following qualifiers affect what happens at a routine call:

       /INTO
       /[NO]JSB (VAX only)
       /OVER
       /[NO]SHARE
       /[NO]SYSTEM

    If you plan to enter several STEP commands with the same
    qualifiers, you can first use the SET STEP command to establish
    new default qualifiers (for example, SET STEP INTO, NOSYSTEM
    makes the STEP command behave like STEP/INTO/NOSYSTEM). Then you
    do not have to use those qualifiers with the STEP command. You
    can override the current default qualifiers for the duration of a
    single STEP command by specifying other qualifiers. Use the SHOW
    STEP command to identify the current STEP defaults.