;;;
;;; A type is checkable if it either represents a fixed number of
;;; values (as determined by VALUES-TYPES), or it is the assertion for
-;;; an MV-Bind. A type is simply checkable if all the type assertions
+;;; an MV-BIND. A type is simply checkable if all the type assertions
;;; have a TYPE-CHECK-TEMPLATE. In this :SIMPLE case, the second value
;;; is a list of the type restrictions specified for the leading
;;; positional values.
;;; -- nobody uses the value, or
;;; -- safety is totally unimportant, or
;;; -- the continuation is an argument to an unknown function, or
-;;; -- the continuation is an argument to a known function that has
-;;; no IR2-Convert method or :FAST-SAFE templates that are
+;;; -- the continuation is an argument to a known function that has
+;;; no IR2-CONVERT method or :FAST-SAFE templates that are
;;; compatible with the call's type.
;;;
;;; We must only return NIL when it is *certain* that a check will not
;;; type checks. The penalty for erring by being too speculative is
;;; much nastier, e.g. falling through without ever being able to find
;;; an appropriate VOP.
-;;;
-;;; If there is a compile-time type error, then we always return true
-;;; unless the DEST is a full call. With a full call, the theory is
-;;; that the type error is probably from a declaration in (or on) the
-;;; callee, so the callee should be able to do the check. We want to
-;;; let the callee do the check, because it is possible that the error
-;;; is really in the callee, not the caller. We don't want to make
-;;; people recompile all calls to a function when they were originally
-;;; compiled with a bad declaration (or an old type assertion derived
-;;; from a definition appearing after the call.)
(defun probable-type-check-p (cont)
(declare (type continuation cont))
(let ((dest (continuation-dest cont)))
- (cond ((eq (continuation-type-check cont) :error)
- (if (and (combination-p dest)
- (eq (combination-kind dest) :error))
- nil
- t))
- ((or (not dest)
+ (cond ((or (not dest)
(policy dest (zerop safety)))
nil)
((basic-combination-p dest)
(let ((kind (basic-combination-kind dest)))
(cond ((eq cont (basic-combination-fun dest)) t)
((eq kind :local) t)
- ((member kind '(:full :error)) nil)
+ ((not (eq (continuation-asserted-type cont)
+ (continuation-externally-checkable-type cont)))
+ ;; There is an explicit assertion.
+ t)
+ ((eq kind :full)
+ ;; The theory is that the type assertion is from a
+ ;; declaration in (or on) the callee, so the
+ ;; callee should be able to do the check. We want
+ ;; to let the callee do the check, because it is
+ ;; possible that by the time of call that
+ ;; declaration will be changed and we do not want
+ ;; to make people recompile all calls to a
+ ;; function when they were originally compiled
+ ;; with a bad declaration. (See also bug 35.)
+ nil)
+
+ ((eq kind :error) nil)
+ ;; :ERROR means that we have an invalid syntax of
+ ;; the call and the callee will detect it before
+ ;; thinking about types.
+
((fun-info-ir2-convert kind) t)
(t
(dolist (template (fun-info-templates kind) nil)
;; said that somewhere in here we
;; Set the new block's start and end cleanups to the *start*
;; cleanup of PREV's block. This overrides the incorrect
- ;; default from WITH-BELATED-IR1-ENVIRONMENT.
+ ;; default from WITH-IR1-ENVIRONMENT-FROM-NODE.
;; Unfortunately I can't find any code which corresponds to this.
;; Perhaps it was a stale comment? Or perhaps I just don't
;; understand.. -- WHN 19990521
what (type-specifier dtype) atype-spec))))
(values))
-;;; Mark CONT as being a continuation with a manifest type error. We
-;;; set the kind to :ERROR, and clear any FUN-INFO if the
-;;; continuation is an argument to a known call. The last is done so
-;;; that the back end doesn't have to worry about type errors in
-;;; arguments to known functions. This clearing is inhibited for
-;;; things with IR2-CONVERT methods, since we can't do a full call to
-;;; funny functions.
-(defun mark-error-continuation (cont)
- (declare (type continuation cont))
- (setf (continuation-%type-check cont) :error)
- (let ((dest (continuation-dest cont)))
- (when (and (combination-p dest)
- (let ((kind (basic-combination-kind dest)))
- (or (eq kind :full)
- (and (fun-info-p kind)
- (not (fun-info-ir2-convert kind))))))
- (setf (basic-combination-kind dest) :error)))
- (values))
-
;;; Loop over all blocks in COMPONENT that have TYPE-CHECK set,
;;; looking for continuations with TYPE-CHECK T. We do two mostly
;;; unrelated things: detect compile-time type errors and determine if
(when (block-type-check block)
(do-nodes (node cont block)
(let ((type-check (continuation-type-check cont)))
- (unless (member type-check '(nil :error :deleted))
+ (unless (member type-check '(nil :deleted))
(let ((atype (continuation-asserted-type cont)))
(do-uses (use cont)
(unless (values-types-equal-or-intersect
(node-derived-type use) atype)
- (mark-error-continuation cont)
(unless (policy node (= inhibit-warnings 3))
(emit-type-warning use))))))
(when (eq type-check t)
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