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Chase-position

Make-chase-position

Basic constructor macro for chase-position structures.

Syntax

(make-chase-position [:path <path>] 
                     [:phase <phase>] 
                     [:rsh <rsh>] 
                     [:mask <mask>])

This is the usual way to construct chase-position structures. It simply conses together a structure with the specified fields.

This macro generates a new chase-position structure from scratch. See also change-chase-position, which can "change" an existing structure, instead.

Definition

This is an ordinary make- macro introduced by defprod.

Macro: make-chase-position

(defmacro make-chase-position (&rest args)
  (std::make-aggregate 'chase-position
                       args '((:path) (:phase) (:rsh) (:mask))
                       'make-chase-position
                       nil))

Function: chase-position

(defun chase-position (path phase rsh mask)
  (declare (xargs :guard (and (path-p path)
                              (integerp phase)
                              (natp rsh)
                              (4vmask-p mask))))
  (declare (xargs :guard t))
  (let ((__function__ 'chase-position))
    (declare (ignorable __function__))
    (b* ((path (mbe :logic (path-fix path) :exec path))
         (phase (mbe :logic (ifix phase) :exec phase))
         (rsh (mbe :logic (nfix rsh) :exec rsh))
         (mask (mbe :logic (4vmask-fix mask)
                    :exec mask)))
      (list (cons 'path path)
            (cons 'phase phase)
            (cons 'rsh rsh)
            (cons 'mask mask)))))