contrib/sb-cltl2/compiler-let.lisp

   1 (in-package :sb-cltl2)
   2
   3 (def-ir1-translator compiler-let ((bindings &rest forms) start next result)
   4   (loop for binding in bindings
   5      if (atom binding)
   6         collect binding into vars
   7         and collect nil into values
   8        else do (assert (proper-list-of-length-p binding 1 2))
   9         and collect (first binding) into vars
  10         and collect (eval (second binding)) into values
  11      finally (return (progv vars values
  12                        (sb-c::ir1-convert-progn-body start next result forms)))))
  13
  14 (defun walk-compiler-let (form context env)
  15   (declare (ignore context))
  16   (destructuring-bind (bindings &rest body)
  17       (cdr form)
  18     (loop for binding in bindings
  19        if (atom binding)
  20           collect binding into vars
  21           and collect nil into values
  22          else do (assert (proper-list-of-length-p binding 1 2))
  23           and collect (first binding) into vars
  24           and collect (eval (second binding)) into values
  25        finally (return
  26                  (progv vars values
  27                    (let ((walked-body (sb-walker::walk-repeat-eval body env)))
  28                      (sb-walker::relist* form
  29                                          'compiler-let bindings walked-body)))))))
  30
  31 (sb-walker::define-walker-template compiler-let walk-compiler-let)