(defun order-uvl-sets (component)
(clear-flags component)
+ ;; KLUDGE: Workaround for lp#308914: we keep track of number of blocks
+ ;; needing repeats, and bug out if we get stuck.
(loop with head = (component-head component)
- with repeat-p do
- (setq repeat-p nil)
- (do-blocks (block component)
- (unless (block-flag block)
- (let ((pred (find-if #'block-flag (block-pred block))))
- (when (and (eq pred head)
- (not (bind-p (block-start-node block))))
- (let ((entry (nle-block-entry-block block)))
- (setq pred (if (block-flag entry) entry nil))))
- (cond (pred
- (setf (block-flag block) t)
- (order-block-uvl-sets block pred))
- (t
- (setq repeat-p t))))))
- while repeat-p))
+ with todo = 0
+ with last-todo = 0
+ do (psetq last-todo todo
+ todo 0)
+ do (do-blocks (block component)
+ (unless (block-flag block)
+ (let ((pred (find-if #'block-flag (block-pred block))))
+ (when (and (eq pred head)
+ (not (bind-p (block-start-node block))))
+ (let ((entry (nle-block-entry-block block)))
+ (setq pred (if (block-flag entry) entry nil))))
+ (cond (pred
+ (setf (block-flag block) t)
+ (order-block-uvl-sets block pred))
+ (t
+ (incf todo))))))
+ do (when (= last-todo todo)
+ ;; If the todo count is the same as on last iteration, it means
+ ;; we are stuck, which in turn means the unmarked blocks are
+ ;; actually unreachable, so UVL set ordering for them doesn't
+ ;; matter.
+ (return-from order-uvl-sets))
+ while (plusp todo)))
\f
;;; This is called when we discover that the stack-top unknown-values
;;; lvar at the end of BLOCK1 is different from that at the start of
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