Arguments: &key from-read-eval-print-loop brief moderate verbose top bottom count specials function relative all
This command prints the evaluation stack. It uses the current stack frame as the center
of attention, and prints some number of frames on either side of the current frame. The
value of the variable *zoom-display*
is the total number of frames to display, and an equal number of frames are printed above
and below the current stack frame, if possible. The arguments to the :zoom
command control the type and quantity of the displayed stack.
After a :zoom or any of its
analogs (such as :top or :bottom) the special variable
cl:* contains the lisp expression representing the
current frame. That expression is approximately what is shown in a
moderate display with :function nil, regardless of the
mode in which :zoom itself
displays.
This command operates on the focused process when multiprocessing is active.
The minimal abbreviation of :zoom is :zo.
The from-read-eval-print-loop argument controls whether
frames after the most recent entry to the Lisp read-eval-print-loop
are ignored (when this argument is true, the default) or not (when
this argument is nil). This argument should be specified
nil when :zoom is called
programmatically. It should be left t when
:zoom is called interactively.
The remaining keyword arguments to :zoom are described in the following table.
Table 1: :zoom Keyword Arguments | |||
:zoom keyword | Functionality | Keyword argument value | |
nil | non-nil | ||
:brief | These control the amount of information :zoom
prints. Specify only one at a time. Chosen value sticks from one call to :zoom to the next. See examples of the output styles in :brief, :moderate, and :verbose modes of :zoom in debugging.htm. | :moderate is used. | :zoom will print the function names of the stack frames only. Frames will be separated by `<-' and more than one will appear on a line. The current frame will be displayed specially. |
:moderate | has no effect on mode of the display | :zoom will print function names and actual parameters. :moderate is the initial default display mode. | |
:verbose | :moderate is used | :zoom will print function names, formals (the names of the parameters in the function definition) and actual parameters. | |
:top | These arguments control where :zoom places the current stack frame pointer. Specify only one at a time. | has no effect. | current stack frame pointer will be at the top of the stack. |
:bottom | has no effect. | current stack frame pointer will be at the bottom of the stack. | |
:count | Integer number of frames to print. Initial default value is
controlled by *zoom-display*.
Specifying a value sets that variable so the value sticks. | Not applicable. | The value t (but not other true values) means display all applicable frames. |
:specials | If specified, sets (not binds) the value of *zoom-print-special-bindings*.The value of this argument sticks between :zooms. | Specials bound by active functions will not be printed. | If *zoom-print-special-bindings*
is true, :zoom will print any specials bound by active
functions. |
:function | Affects how frames are printed. The value of this arguments sticks from one call of :zoom to another. | Frames will be printed as (funcall
# | Frames will be printed as (foo . . .). This is the initial default. |
:relative | Print line numbers relative to the current frame for :moderate and :verbose :zoom displays (has no effect on :brief display). The value of this argument sticks from one call to :zoom to the next. | Do not print relative identifiers. This is the initial default. | An identifier is printed on each line output giving the location of that line relative to the current frame. |
:all | Provides override to the :hide command.
| If specified and nil, the frames specified by :hide will be hidden. This is the initial default. | If specified and true, then the list associated with the :hide command is ignored and all frames are displayed. |
See top-level.htm for more information on top-level commands. See debugging.htm for information on the debugger and examples of tracing.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.