u.help

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                     Slicer Control Panel Help

  This is the control panel for the slicer.  The slicer allows the
user to select variables and source lines to perform slices on.  A
program slice, calculated for a variable, v, and a statement, n, is
the set of statements that might influence the value of v just before
execution of statement n.

  Program slices can be used as a program understanding aid to help
answer questions about a single computation.  If the program slice is
smaller than the original program, it should be easier to understand
just the slice than the entire program.

  Program slices may be combined to find statements common
to two computations (backbone slice) or statements unique
to one of two computations.

The slicer interface presents the following:
  Select -- A menu to pop up lists for selection
    local variable -- This brings up a list of the procedures of the
program.  Selecting "No Selection" takes no action.  Selecting a
procedure brings up a list of variables local to the procedure to
select from.  Selecting a variable makes that variable the variable in
the slicing criteria.
    global variable -- This brings up a list of the files of the
program.  Selecting "No Selection" takes no action.  Selecting a file
brings up a list of variables declared in that file to select from.
Selecting a variable makes that variable the variable in the slicing
criteria.
    primary -- This selection brings up a list of already computed
slices.  Selecting a slice makes it the primary slice.
    secondary -- This selection brings up a list of already computed
slices.  Selecting a slice makes it the secondary slice.
    Operation  -- A menu for selecting an operation to apply to the
primary and secondary slices.
    Help -- This selection brings up this text in a window.
    scroll bar -- This can be used to move around in the source file.
          Left Mouse Button -- Page up
          Right Mouse Button -- Page down
          Middle Mouse Button -- Go to indicated location
    tick bar -- Each tick represents a marked location or locations in
the source file.  Click the tick bar at the mark to go to that
location.

  To compute a slice select a variable and a line from the
program.  To select a variable first select either global or local
variables from the select menu.  Follow the appropriate instructions as
given above.  After a variable has been selected, use the mouse in the
text window to select a line and compute the slice on the current
variable and selected line by clicking either the left or middle mouse
button on the desired line.  If the left mouse button is selected, the
slice becomes the primary selection, if the middle mouse button is
clicked, the slice becomes the secondary selection.

  To make an already computed slice the primary or secondary
selection, use the primary or secondary menu items
to pop up a list of already computed slices.

  After a primary and a secondary slice are selected, the
operation menu can be used to compute backbone slices
and program dices.

Version: @(#)u.help	1.2  9/23/94