\f
;;;; interface for obtaining results of constant folding
-;;; Return true for a CONTINUATION whose sole use is a reference to a
+;;; Return true for an LVAR whose sole use is a reference to a
;;; constant leaf.
(defun constant-lvar-p (thing)
+ (declare (type (or lvar null) thing))
(and (lvar-p thing)
(let ((use (principal-lvar-use thing)))
(and (ref-p use) (constant-p (ref-leaf use))))))
-;;; Return the constant value for a continuation whose only use is a
-;;; constant node.
+;;; Return the constant value for an LVAR whose only use is a constant
+;;; node.
(declaim (ftype (function (lvar) t) lvar-value))
(defun lvar-value (lvar)
(let ((use (principal-lvar-use lvar)))
\f
;;;; interface for obtaining results of type inference
-;;; Our best guess for the type of this continuation's value. Note
-;;; that this may be VALUES or FUNCTION type, which cannot be passed
-;;; as an argument to the normal type operations. See
-;;; CONTINUATION-TYPE. This may be called on deleted continuations,
-;;; always returning *.
+;;; Our best guess for the type of this lvar's value. Note that this
+;;; may be VALUES or FUNCTION type, which cannot be passed as an
+;;; argument to the normal type operations. See LVAR-TYPE.
;;;
-;;; What we do is call CONTINUATION-PROVEN-TYPE and check whether the
-;;; result is a subtype of the assertion. If so, return the proven
-;;; type and set TYPE-CHECK to NIL. Otherwise, return the intersection
-;;; of the asserted and proven types, and set TYPE-CHECK T. If
-;;; TYPE-CHECK already has a non-null value, then preserve it. Only in
-;;; the somewhat unusual circumstance of a newly discovered assertion
-;;; will we change TYPE-CHECK from NIL to T.
-;;;
-;;; The result value is cached in the CONTINUATION-%DERIVED-TYPE slot.
-;;; If the slot is true, just return that value, otherwise recompute
-;;; and stash the value there.
+;;; The result value is cached in the LVAR-%DERIVED-TYPE slot. If the
+;;; slot is true, just return that value, otherwise recompute and
+;;; stash the value there.
#!-sb-fluid (declaim (inline lvar-derived-type))
(defun lvar-derived-type (lvar)
(declare (type lvar lvar))
(t
(node-derived-type (lvar-uses lvar))))))
-;;; Return the derived type for CONT's first value. This is guaranteed
+;;; Return the derived type for LVAR's first value. This is guaranteed
;;; not to be a VALUES or FUNCTION type.
(declaim (ftype (sfunction (lvar) ctype) lvar-type))
(defun lvar-type (lvar)
(single-value-type (lvar-derived-type lvar)))
-;;; If CONT is an argument of a function, return a type which the
-;;; function checks CONT for.
+;;; If LVAR is an argument of a function, return a type which the
+;;; function checks LVAR for.
#!-sb-fluid (declaim (inline lvar-externally-checkable-type))
(defun lvar-externally-checkable-type (lvar)
(or (lvar-%externally-checkable-type lvar)
(defun ir1-optimize (component)
(declare (type component component))
(setf (component-reoptimize component) nil)
- (do-blocks (block component)
- (cond
- ;; We delete blocks when there is either no predecessor or the
- ;; block is in a lambda that has been deleted. These blocks
- ;; would eventually be deleted by DFO recomputation, but doing
- ;; it here immediately makes the effect available to IR1
- ;; optimization.
- ((or (block-delete-p block)
- (null (block-pred block)))
- (delete-block block))
- ((eq (functional-kind (block-home-lambda block)) :deleted)
- ;; Preserve the BLOCK-SUCC invariant that almost every block has
- ;; one successor (and a block with DELETE-P set is an acceptable
- ;; exception).
- (mark-for-deletion block)
- (delete-block block))
- (t
- (loop
- (let ((succ (block-succ block)))
- (unless (singleton-p succ)
- (return)))
-
- (let ((last (block-last block)))
- (typecase last
- (cif
- (flush-dest (if-test last))
- (when (unlink-node last)
- (return)))
- (exit
- (when (maybe-delete-exit last)
- (return)))))
-
- (unless (join-successor-if-possible block)
- (return)))
-
- (when (and (block-reoptimize block) (block-component block))
- (aver (not (block-delete-p block)))
- (ir1-optimize-block block))
-
- (cond ((and (block-delete-p block) (block-component block))
- (delete-block block))
- ((and (block-flush-p block) (block-component block))
- (flush-dead-code block))))))
+ (loop with block = (block-next (component-head component))
+ with tail = (component-tail component)
+ for last-block = block
+ until (eq block tail)
+ do (cond
+ ;; We delete blocks when there is either no predecessor or the
+ ;; block is in a lambda that has been deleted. These blocks
+ ;; would eventually be deleted by DFO recomputation, but doing
+ ;; it here immediately makes the effect available to IR1
+ ;; optimization.
+ ((or (block-delete-p block)
+ (null (block-pred block)))
+ (delete-block-lazily block)
+ (setq block (clean-component component block)))
+ ((eq (functional-kind (block-home-lambda block)) :deleted)
+ ;; Preserve the BLOCK-SUCC invariant that almost every block has
+ ;; one successor (and a block with DELETE-P set is an acceptable
+ ;; exception).
+ (mark-for-deletion block)
+ (setq block (clean-component component block)))
+ (t
+ (loop
+ (let ((succ (block-succ block)))
+ (unless (singleton-p succ)
+ (return)))
+
+ (let ((last (block-last block)))
+ (typecase last
+ (cif
+ (flush-dest (if-test last))
+ (when (unlink-node last)
+ (return)))
+ (exit
+ (when (maybe-delete-exit last)
+ (return)))))
+
+ (unless (join-successor-if-possible block)
+ (return)))
+
+ (when (and (block-reoptimize block) (block-component block))
+ (aver (not (block-delete-p block)))
+ (ir1-optimize-block block))
+
+ (cond ((and (block-delete-p block) (block-component block))
+ (setq block (clean-component component block)))
+ ((and (block-flush-p block) (block-component block))
+ (flush-dead-code block)))))
+ do (when (eq block last-block)
+ (setq block (block-next block))))
(values))
(defun flush-dead-code (block)
(declare (type cblock block))
(setf (block-flush-p block) nil)
- (do-nodes-backwards (node lvar block)
+ (do-nodes-backwards (node lvar block :restart-p t)
(unless lvar
(typecase node
(ref
(let ((result (return-result node)))
(collect ((use-union *empty-type* values-type-union))
(do-uses (use result)
- (cond ((and (basic-combination-p use)
- (eq (basic-combination-kind use) :local))
- (aver (eq (lambda-tail-set (node-home-lambda use))
- (lambda-tail-set (combination-lambda use))))
- (when (combination-p use)
- (when (nth-value 1 (maybe-convert-tail-local-call use))
- (return-from find-result-type (values)))))
- (t
- (use-union (node-derived-type use)))))
+ (let ((use-home (node-home-lambda use)))
+ (cond ((or (eq (functional-kind use-home) :deleted)
+ (block-delete-p (node-block use))))
+ ((and (basic-combination-p use)
+ (eq (basic-combination-kind use) :local))
+ (aver (eq (lambda-tail-set use-home)
+ (lambda-tail-set (combination-lambda use))))
+ (when (combination-p use)
+ (when (nth-value 1 (maybe-convert-tail-local-call use))
+ (return-from find-result-type t))))
+ (t
+ (use-union (node-derived-type use))))))
(let ((int
;; (values-type-intersection
;; (continuation-asserted-type result) ; FIXME -- APD, 2002-01-26
(use-union)
;; )
- ))
+ ))
(setf (return-result-type node) int))))
- (values))
+ nil)
;;; Do stuff to realize that something has changed about the value
;;; delivered to a return node. Since we consider the return values of
;;;
;;; When we are done, we check whether the new type is different from
;;; the old TAIL-SET-TYPE. If so, we set the type and also reoptimize
-;;; all the continuations for references to functions in the tail set.
-;;; This will cause IR1-OPTIMIZE-COMBINATION to derive the new type as
-;;; the results of the calls.
+;;; all the lvars for references to functions in the tail set. This
+;;; will cause IR1-OPTIMIZE-COMBINATION to derive the new type as the
+;;; results of the calls.
(defun ir1-optimize-return (node)
(declare (type creturn node))
- (let* ((tails (lambda-tail-set (return-lambda node)))
- (funs (tail-set-funs tails)))
- (collect ((res *empty-type* values-type-union))
- (dolist (fun funs)
- (let ((return (lambda-return fun)))
- (when return
- (when (node-reoptimize return)
- (setf (node-reoptimize return) nil)
- (find-result-type return))
- (res (return-result-type return)))))
-
- (when (type/= (res) (tail-set-type tails))
- (setf (tail-set-type tails) (res))
- (dolist (fun (tail-set-funs tails))
- (dolist (ref (leaf-refs fun))
- (reoptimize-lvar (node-lvar ref)))))))
+ (tagbody
+ :restart
+ (let* ((tails (lambda-tail-set (return-lambda node)))
+ (funs (tail-set-funs tails)))
+ (collect ((res *empty-type* values-type-union))
+ (dolist (fun funs)
+ (let ((return (lambda-return fun)))
+ (when return
+ (when (node-reoptimize return)
+ (setf (node-reoptimize return) nil)
+ (when (find-result-type return)
+ (go :restart)))
+ (res (return-result-type return)))))
+
+ (when (type/= (res) (tail-set-type tails))
+ (setf (tail-set-type tails) (res))
+ (dolist (fun (tail-set-funs tails))
+ (dolist (ref (leaf-refs fun))
+ (reoptimize-lvar (node-lvar ref))))))))
(values))
\f
(declaim (ftype (function (combination) (values)) ir1-optimize-combination))
(defun ir1-optimize-combination (node)
(when (lvar-reoptimize (basic-combination-fun node))
- (propagate-fun-change node))
+ (propagate-fun-change node)
+ (maybe-terminate-block node nil))
(let ((args (basic-combination-args node))
(kind (basic-combination-kind node)))
(case kind
(values))
;;; If NODE doesn't return (i.e. return type is NIL), then terminate
-;;; the block there, and link it to the component tail. We also change
-;;; the NODE's CONT to be a dummy continuation to prevent the use from
-;;; confusing things.
+;;; the block there, and link it to the component tail.
;;;
;;; Except when called during IR1 convertion, we delete the
;;; continuation if it has no other uses. (If it does have other uses,
(set-use (principal-lvar-use (set-value set)))
(() (and (combination-p set-use)
(fun-info-p (combination-kind set-use))
+ (not (node-to-be-deleted-p set-use))
(eq (combination-fun-source-name set-use) '+))
:exit-if-null)
(+-args (basic-combination-args set-use))
(info :function :info name)))))))))
;;; If we have a non-set LET var with a single use, then (if possible)
-;;; replace the variable reference's CONT with the arg continuation.
+;;; replace the variable reference's LVAR with the arg lvar.
;;;
;;; We change the REF to be a reference to NIL with unused value, and
;;; let it be flushed as dead code. A side effect of this substitution
;;; Delete a LET, removing the call and bind nodes, and warning about
;;; any unreferenced variables. Note that FLUSH-DEAD-CODE will come
;;; along right away and delete the REF and then the lambda, since we
-;;; flush the FUN continuation.
+;;; flush the FUN lvar.
(defun delete-let (clambda)
(declare (type clambda clambda))
(aver (functional-letlike-p clambda))
(:error))
(values))
-;;; Propagate derived type info from the values continuation to the
-;;; vars.
+;;; Propagate derived type info from the values lvar to the vars.
(defun ir1-optimize-mv-bind (node)
(declare (type mv-combination node))
(let* ((arg (first (basic-combination-args node)))
(eq (lvar-fun-name (combination-fun use))
'list))
- ;; FIXME: VALUES might not satisfy an assertion on NODE-CONT.
+ ;; FIXME: VALUES might not satisfy an assertion on NODE-LVAR.
(change-ref-leaf (lvar-uses (combination-fun node))
(find-free-fun 'values "in a strange place"))
(setf (combination-kind node) :full)
;;; - CAST chains;
(defun ir1-optimize-cast (cast &optional do-not-optimize)
(declare (type cast cast))
- (let* ((value (cast-value cast))
- (value-type (lvar-derived-type value))
- (atype (cast-asserted-type cast))
- (int (values-type-intersection value-type atype)))
- (derive-node-type cast int)
- (when (eq int *empty-type*)
- (unless (eq value-type *empty-type*)
-
- ;; FIXME: Do it in one step.
- (filter-lvar
- value
- `(multiple-value-call #'list 'dummy))
- (filter-lvar
- (cast-value cast)
- ;; FIXME: Derived type.
- `(%compile-time-type-error 'dummy
- ',(type-specifier atype)
- ',(type-specifier value-type)))
- ;; KLUDGE: FILTER-CONTINUATION does not work for
- ;; non-returning functions, so we declare the return type of
- ;; %COMPILE-TIME-TYPE-ERROR to be * and derive the real type
- ;; here.
- (setq value (cast-value cast))
- (derive-node-type (lvar-uses value) *empty-type*)
- (maybe-terminate-block (lvar-uses value) nil)
- ;; FIXME: Is it necessary?
- (aver (null (block-pred (node-block cast))))
- (setf (block-delete-p (node-block cast)) t)
- (return-from ir1-optimize-cast)))
- (when (eq (node-derived-type cast) *empty-type*)
- (maybe-terminate-block cast nil))
-
+ (let ((value (cast-value cast))
+ (atype (cast-asserted-type cast)))
(when (not do-not-optimize)
(let ((lvar (node-lvar cast)))
- (when (values-subtypep value-type (cast-asserted-type cast))
+ (when (values-subtypep (lvar-derived-type value)
+ (cast-asserted-type cast))
(delete-filter cast lvar value)
(when lvar
(reoptimize-lvar lvar)
(dolist (use (merges))
(merge-tail-sets use)))))))
- (when (and (cast-%type-check cast)
- (values-subtypep value-type
- (cast-type-to-check cast)))
- (setf (cast-%type-check cast) nil)))
+ (let* ((value-type (lvar-derived-type value))
+ (int (values-type-intersection value-type atype)))
+ (derive-node-type cast int)
+ (when (eq int *empty-type*)
+ (unless (eq value-type *empty-type*)
+
+ ;; FIXME: Do it in one step.
+ (filter-lvar
+ value
+ `(multiple-value-call #'list 'dummy))
+ (filter-lvar
+ (cast-value cast)
+ ;; FIXME: Derived type.
+ `(%compile-time-type-error 'dummy
+ ',(type-specifier atype)
+ ',(type-specifier value-type)))
+ ;; KLUDGE: FILTER-LVAR does not work for non-returning
+ ;; functions, so we declare the return type of
+ ;; %COMPILE-TIME-TYPE-ERROR to be * and derive the real type
+ ;; here.
+ (setq value (cast-value cast))
+ (derive-node-type (lvar-uses value) *empty-type*)
+ (maybe-terminate-block (lvar-uses value) nil)
+ ;; FIXME: Is it necessary?
+ (aver (null (block-pred (node-block cast))))
+ (delete-block-lazily (node-block cast))
+ (return-from ir1-optimize-cast)))
+ (when (eq (node-derived-type cast) *empty-type*)
+ (maybe-terminate-block cast nil))
+
+ (when (and (cast-%type-check cast)
+ (values-subtypep value-type
+ (cast-type-to-check cast)))
+ (setf (cast-%type-check cast) nil))))
(unless do-not-optimize
(setf (node-reoptimize cast) nil)))
projects / sbcl.git / blobdiff