+(defun handle-nested-dynamic-extent-lvars (lvar)
+ (let ((uses (lvar-uses lvar)))
+ ;; Stack analysis wants DX value generators to end their
+ ;; blocks. Uses of mupltiple used LVARs already end their blocks,
+ ;; so we just need to process used-once LVARs.
+ (when (node-p uses)
+ (node-ends-block uses))
+ ;; If this LVAR's USE is good for DX, it must be a regular
+ ;; combination, and its arguments are potentially DX as well.
+ (flet ((recurse (use)
+ (loop for arg in (combination-args use)
+ append (handle-nested-dynamic-extent-lvars arg))))
+ (cons lvar
+ (if (listp uses)
+ (loop for use in uses
+ when (use-good-for-dx-p use)
+ nconc (recurse use))
+ (when (use-good-for-dx-p uses)
+ (recurse uses)))))))
+
+(defun recognize-dynamic-extent-lvars (call fun)
+ (declare (type combination call) (type clambda fun))
+ (loop for arg in (basic-combination-args call)
+ and var in (lambda-vars fun)
+ when (and arg (lambda-var-dynamic-extent var)
+ (not (lvar-dynamic-extent arg)))
+ append (handle-nested-dynamic-extent-lvars arg) into dx-lvars
+ finally (when dx-lvars
+ (binding* ((before-ctran (node-prev call))
+ (nil (ensure-block-start before-ctran))
+ (block (ctran-block before-ctran))
+ (new-call-ctran (make-ctran :kind :inside-block
+ :next call
+ :block block))
+ (entry (with-ir1-environment-from-node call
+ (make-entry :prev before-ctran
+ :next new-call-ctran)))
+ (cleanup (make-cleanup :kind :dynamic-extent
+ :mess-up entry
+ :info dx-lvars)))
+ (setf (node-prev call) new-call-ctran)
+ (setf (ctran-next before-ctran) entry)
+ (setf (ctran-use new-call-ctran) entry)
+ (setf (entry-cleanup entry) cleanup)
+ (setf (node-lexenv call)
+ (make-lexenv :default (node-lexenv call)
+ :cleanup cleanup))
+ (push entry (lambda-entries (node-home-lambda entry)))
+ (dolist (lvar dx-lvars)
+ (setf (lvar-dynamic-extent lvar) cleanup)))))
+ (values))
+