(in-package "SB!IMPL")
#!-sb-fluid
-(declaim (inline fill-pointer array-has-fill-pointer-p adjustable-array-p
+(declaim (inline adjustable-array-p
array-displacement))
\f
;;;; miscellaneous accessor functions
(def %array-available-elements)
(def %array-data-vector)
(def %array-displacement)
- (def %array-displaced-p))
+ (def %array-displaced-p)
+ (def %array-diplaced-from))
(defun %array-rank (array)
(%array-rank array))
(fixnum index))
(%check-bound array bound index))
+(defun %with-array-data/fp (array start end)
+ (%with-array-data-macro array start end :check-bounds t :check-fill-pointer t))
+
(defun %with-array-data (array start end)
- (%with-array-data-macro array start end :fail-inline? t))
+ (%with-array-data-macro array start end :check-bounds t :check-fill-pointer nil))
(defun %data-vector-and-index (array index)
(if (array-header-p array)
(%with-array-data array index nil)
(values vector index))
(values array index)))
-
-;;; It'd waste space to expand copies of error handling in every
-;;; inline %WITH-ARRAY-DATA, so we have them call this function
-;;; instead. This is just a wrapper which is known never to return.
-(defun failed-%with-array-data (array start end)
- (declare (notinline %with-array-data))
- (%with-array-data array start end)
- (bug "called FAILED-%WITH-ARRAY-DATA with valid array parameters?"))
\f
;;;; MAKE-ARRAY
(eval-when (:compile-toplevel :execute)
(values #.sb!vm:simple-bit-vector-widetag 1))
;; OK, we have to wade into SUBTYPEPing after all.
(t
+ (unless *type-system-initialized*
+ (bug "SUBTYPEP dispatch for MAKE-ARRAY before the type system is ready"))
#.`(pick-vector-type type
,@(map 'list
(lambda (saetp)
(setf (%array-fill-pointer-p array) nil)))
(setf (%array-available-elements array) total-size)
(setf (%array-data-vector array) data)
+ (setf (%array-displaced-from array) nil)
(cond (displaced-to
(when (or initial-element-p initial-contents-p)
(error "Neither :INITIAL-ELEMENT nor :INITIAL-CONTENTS ~
(array-total-size displaced-to))
(error "~S doesn't have enough elements." displaced-to))
(setf (%array-displacement array) offset)
- (setf (%array-displaced-p array) t)))
+ (setf (%array-displaced-p array) t)
+ (%save-displaced-array-backpointer array data)))
(t
(setf (%array-displaced-p array) nil)))
(let ((axis 0))
"Construct a SIMPLE-VECTOR from the given objects."
(coerce (the list objects) 'simple-vector))
\f
+
;;;; accessor/setter functions
-(defun hairy-data-vector-ref (array index)
- (with-array-data ((vector array) (index index) (end))
- (declare (ignore end))
- (etypecase vector .
- #.(map 'list
- (lambda (saetp)
- (let* ((type (sb!vm:saetp-specifier saetp))
- (atype `(simple-array ,type (*))))
- `(,atype
- (data-vector-ref (the ,atype vector) index))))
- (sort
- (copy-seq
- sb!vm:*specialized-array-element-type-properties*)
- #'> :key #'sb!vm:saetp-importance)))))
+
+;;; Dispatch to an optimized routine the data vector accessors for
+;;; each different specialized vector type. Do dispatching by looking
+;;; up the widetag in the array rather than with the typecases, which
+;;; as of 1.0.5 compiles to a naive sequence of linear TYPEPs. Also
+;;; provide separate versions where bounds checking has been moved
+;;; from the callee to the caller, since it's much cheaper to do once
+;;; the type information is available. Finally, for each of these
+;;; routines also provide a slow path, taken for arrays that are not
+;;; vectors or not simple.
+(macrolet ((def (name table-name)
+ `(progn
+ (defglobal ,table-name (make-array ,(1+ sb!vm:widetag-mask)))
+ (defmacro ,name (array-var)
+ `(the function
+ (let ((tag 0))
+ (when (sb!vm::%other-pointer-p ,array-var)
+ (setf tag (%other-pointer-widetag ,array-var)))
+ (svref ,',table-name tag)))))))
+ (def !find-data-vector-setter %%data-vector-setters%%)
+ (def !find-data-vector-setter/check-bounds %%data-vector-setters/check-bounds%%)
+ (def !find-data-vector-reffer %%data-vector-reffers%%)
+ (def !find-data-vector-reffer/check-bounds %%data-vector-reffers/check-bounds%%))
+
+(macrolet ((%ref (accessor-getter extra-params)
+ `(funcall (,accessor-getter array) array index ,@extra-params))
+ (define (accessor-name slow-accessor-name accessor-getter
+ extra-params check-bounds)
+ `(progn
+ (defun ,accessor-name (array index ,@extra-params)
+ (declare (optimize speed
+ ;; (SAFETY 0) is ok. All calls to
+ ;; these functions are generated by
+ ;; the compiler, so argument count
+ ;; checking isn't needed. Type checking
+ ;; is done implicitly via the widetag
+ ;; dispatch.
+ (safety 0)))
+ (%ref ,accessor-getter ,extra-params))
+ (defun ,slow-accessor-name (array index ,@extra-params)
+ (declare (optimize speed (safety 0)))
+ (if (not (%array-displaced-p array))
+ ;; The reasonably quick path of non-displaced complex
+ ;; arrays.
+ (let ((array (%array-data-vector array)))
+ (%ref ,accessor-getter ,extra-params))
+ ;; The real slow path.
+ (with-array-data
+ ((vector array)
+ (index (locally
+ (declare (optimize (speed 1) (safety 1)))
+ (,@check-bounds index)))
+ (end)
+ :force-inline t)
+ (declare (ignore end))
+ (,accessor-name vector index ,@extra-params)))))))
+ (define hairy-data-vector-ref slow-hairy-data-vector-ref
+ !find-data-vector-reffer
+ nil (progn))
+ (define hairy-data-vector-set slow-hairy-data-vector-set
+ !find-data-vector-setter
+ (new-value) (progn))
+ (define hairy-data-vector-ref/check-bounds
+ slow-hairy-data-vector-ref/check-bounds
+ !find-data-vector-reffer/check-bounds
+ nil (%check-bound array (array-dimension array 0)))
+ (define hairy-data-vector-set/check-bounds
+ slow-hairy-data-vector-set/check-bounds
+ !find-data-vector-setter/check-bounds
+ (new-value) (%check-bound array (array-dimension array 0))))
+
+(defun hairy-ref-error (array index &optional new-value)
+ (declare (ignore index new-value))
+ (error 'type-error
+ :datum array
+ :expected-type 'vector))
+
+(macrolet ((define-reffer (saetp check-form)
+ (let* ((type (sb!vm:saetp-specifier saetp))
+ (atype `(simple-array ,type (*))))
+ `(named-lambda optimized-data-vector-ref (vector index)
+ (declare (optimize speed (safety 0)))
+ (data-vector-ref (the ,atype vector)
+ (locally
+ (declare (optimize (safety 1)))
+ (the index
+ (,@check-form index)))))))
+ (define-setter (saetp check-form)
+ (let* ((type (sb!vm:saetp-specifier saetp))
+ (atype `(simple-array ,type (*))))
+ `(named-lambda optimized-data-vector-set (vector index new-value)
+ (declare (optimize speed (safety 0)))
+ (data-vector-set (the ,atype vector)
+ (locally
+ (declare (optimize (safety 1)))
+ (the index
+ (,@check-form index)))
+ (locally
+ ;; SPEED 1 needed to avoid the compiler
+ ;; from downgrading the type check to
+ ;; a cheaper one.
+ (declare (optimize (speed 1)
+ (safety 1)))
+ (the ,type new-value)))
+ ;; For specialized arrays, the return from
+ ;; data-vector-set would have to be reboxed to be a
+ ;; (Lisp) return value; instead, we use the
+ ;; already-boxed value as the return.
+ new-value)))
+ (define-reffers (symbol deffer check-form slow-path)
+ `(progn
+ ;; FIXME/KLUDGE: can't just FILL here, because genesis doesn't
+ ;; preserve the binding, so re-initiaize as NS doesn't have
+ ;; the energy to figure out to change that right now.
+ (setf ,symbol (make-array (1+ sb!vm::widetag-mask)
+ :initial-element #'hairy-ref-error))
+ ,@(loop for widetag in '(sb!vm:complex-vector-widetag
+ sb!vm:complex-vector-nil-widetag
+ sb!vm:complex-bit-vector-widetag
+ #!+sb-unicode sb!vm:complex-character-string-widetag
+ sb!vm:complex-base-string-widetag
+ sb!vm:simple-array-widetag
+ sb!vm:complex-array-widetag)
+ collect `(setf (svref ,symbol ,widetag) ,slow-path))
+ ,@(loop for saetp across sb!vm:*specialized-array-element-type-properties*
+ for widetag = (sb!vm:saetp-typecode saetp)
+ collect `(setf (svref ,symbol ,widetag)
+ (,deffer ,saetp ,check-form))))))
+ (defun !hairy-data-vector-reffer-init ()
+ (define-reffers %%data-vector-reffers%% define-reffer
+ (progn)
+ #'slow-hairy-data-vector-ref)
+ (define-reffers %%data-vector-setters%% define-setter
+ (progn)
+ #'slow-hairy-data-vector-set)
+ (define-reffers %%data-vector-reffers/check-bounds%% define-reffer
+ (%check-bound vector (length vector))
+ #'slow-hairy-data-vector-ref/check-bounds)
+ (define-reffers %%data-vector-setters/check-bounds%% define-setter
+ (%check-bound vector (length vector))
+ #'slow-hairy-data-vector-set/check-bounds)))
;;; (Ordinary DATA-VECTOR-REF usage compiles into a vop, but
;;; DATA-VECTOR-REF is also FOLDABLE, and this ordinary function
(defun data-vector-ref (array index)
(hairy-data-vector-ref array index))
-(defun hairy-data-vector-set (array index new-value)
- (with-array-data ((vector array) (index index) (end))
- (declare (ignore end))
- (etypecase vector .
- #.(map 'list
- (lambda (saetp)
- (let* ((type (sb!vm:saetp-specifier saetp))
- (atype `(simple-array ,type (*))))
- `(,atype
- (data-vector-set (the ,atype vector) index
- (the ,type new-value))
- ;; For specialized arrays, the return from
- ;; data-vector-set would have to be
- ;; reboxed to be a (Lisp) return value;
- ;; instead, we use the already-boxed value
- ;; as the return.
- new-value)))
- (sort
- (copy-seq
- sb!vm:*specialized-array-element-type-properties*)
- #'> :key #'sb!vm:saetp-importance)))))
+(defun data-vector-ref-with-offset (array index offset)
+ (hairy-data-vector-ref array (+ index offset)))
+
+(defun invalid-array-p (array)
+ (and (array-header-p array)
+ (consp (%array-displaced-p array))))
+
+(declaim (ftype (function (array) nil) invalid-array-error))
+(defun invalid-array-error (array)
+ (aver (array-header-p array))
+ ;; Array invalidation stashes the original dimensions here...
+ (let ((dims (%array-displaced-p array))
+ (et (array-element-type array)))
+ (error 'invalid-array-error
+ :datum array
+ :expected-type
+ (if (cdr dims)
+ `(array ,et ,dims)
+ `(vector ,et ,@dims)))))
+
+(declaim (ftype (function (array integer integer &optional t) nil)
+ invalid-array-index-error))
+(defun invalid-array-index-error (array index bound &optional axis)
+ (if (invalid-array-p array)
+ (invalid-array-error array)
+ (error 'invalid-array-index-error
+ :array array
+ :axis axis
+ :datum index
+ :expected-type `(integer 0 (,bound)))))
;;; SUBSCRIPTS has a dynamic-extent list structure and is destroyed
(defun %array-row-major-index (array subscripts
(declare (fixnum dim))
(unless (and (fixnump index) (< -1 index dim))
(if invalid-index-error-p
- (error 'simple-type-error
- :format-control "invalid index ~W~[~;~:; on axis ~:*~W~] in ~S"
- :format-arguments (list index axis array)
- :datum index
- :expected-type `(integer 0 (,dim)))
+ (invalid-array-index-error array index dim axis)
(return-from %array-row-major-index nil)))
(incf result (* chunk-size (the fixnum index)))
(setf chunk-size (* chunk-size dim))))
(length (length (the (simple-array * (*)) array))))
(unless (and (fixnump index) (< -1 index length))
(if invalid-index-error-p
- ;; FIXME: perhaps this should share a format-string
- ;; with INVALID-ARRAY-INDEX-ERROR or
- ;; INDEX-TOO-LARGE-ERROR?
- (error 'simple-type-error
- :format-control "invalid index ~W in ~S"
- :format-arguments (list index array)
- :datum index
- :expected-type `(integer 0 (,length)))
+ (invalid-array-index-error array index length)
(return-from %array-row-major-index nil)))
index))))
(defun array-in-bounds-p (array &rest subscripts)
#!+sb-doc
- "Return T if the SUBSCIPTS are in bounds for the ARRAY, NIL otherwise."
+ "Return T if the SUBSCRIPTS are in bounds for the ARRAY, NIL otherwise."
(if (%array-row-major-index array subscripts nil)
t))
(defun array-row-major-index (array &rest subscripts)
- (declare (dynamic-extent subscripts))
+ (declare (truly-dynamic-extent subscripts))
(%array-row-major-index array subscripts))
(defun aref (array &rest subscripts)
#!+sb-doc
"Return the element of the ARRAY specified by the SUBSCRIPTS."
- (declare (dynamic-extent subscripts))
+ (declare (truly-dynamic-extent subscripts))
(row-major-aref array (%array-row-major-index array subscripts)))
(defun %aset (array &rest stuff)
- (declare (dynamic-extent stuff))
+ (declare (truly-dynamic-extent stuff))
(let ((subscripts (butlast stuff))
(new-value (car (last stuff))))
(setf (row-major-aref array (%array-row-major-index array subscripts))
#!-sb-fluid (declaim (inline (setf aref)))
(defun (setf aref) (new-value array &rest subscripts)
- (declare (dynamic-extent subscripts))
+ (declare (truly-dynamic-extent subscripts))
(declare (type array array))
(setf (row-major-aref array (%array-row-major-index array subscripts))
new-value))
(error "Axis number ~W is too big; ~S only has ~D dimension~:P."
axis-number array (%array-rank array)))
(t
- ;; ANSI sayeth (ADJUST-ARRAY dictionary entry):
- ;;
- ;; "If A is displaced to B, the consequences are
- ;; unspecified if B is adjusted in such a way that it no
- ;; longer has enough elements to satisfy A.
- ;;
- ;; In situations where this matters we should be doing a
- ;; bounds-check, which in turn uses ARRAY-DIMENSION -- so
- ;; this seems like a good place to signal an error.
- (multiple-value-bind (target offset) (array-displacement array)
- (when (and target
- (> (array-total-size array)
- (- (array-total-size target) offset)))
- (error 'displaced-to-array-too-small-error
- :format-control "~@<The displaced-to array is too small. ~S ~
- elements after offset required, ~S available.~:@>"
- :format-arguments (list (array-total-size array)
- (- (array-total-size target) offset))))
- (%array-dimension array axis-number)))))
+ (%array-dimension array axis-number))))
(defun array-dimensions (array)
#!+sb-doc
\f
;;;; fill pointer frobbing stuff
+(declaim (inline array-has-fill-pointer-p))
(defun array-has-fill-pointer-p (array)
#!+sb-doc
"Return T if the given ARRAY has a fill pointer, or NIL otherwise."
(declare (array array))
(and (array-header-p array) (%array-fill-pointer-p array)))
+(defun fill-pointer-error (vector arg)
+ (cond (arg
+ (aver (array-has-fill-pointer-p vector))
+ (let ((max (%array-available-elements vector)))
+ (error 'simple-type-error
+ :datum arg
+ :expected-type (list 'integer 0 max)
+ :format-control "The new fill pointer, ~S, is larger than the length of the vector (~S.)"
+ :format-arguments (list arg max))))
+ (t
+ (error 'simple-type-error
+ :datum vector
+ :expected-type '(and vector (satisfies array-has-fill-pointer-p))
+ :format-control "~S is not an array with a fill pointer."
+ :format-arguments (list vector)))))
+
+(declaim (inline fill-pointer))
(defun fill-pointer (vector)
#!+sb-doc
"Return the FILL-POINTER of the given VECTOR."
- (declare (vector vector))
- (if (and (array-header-p vector) (%array-fill-pointer-p vector))
+ (if (array-has-fill-pointer-p vector)
(%array-fill-pointer vector)
- (error 'simple-type-error
- :datum vector
- :expected-type '(and vector (satisfies array-has-fill-pointer-p))
- :format-control "~S is not an array with a fill pointer."
- :format-arguments (list vector))))
+ (fill-pointer-error vector nil)))
(defun %set-fill-pointer (vector new)
- (declare (vector vector) (fixnum new))
- (if (and (array-header-p vector) (%array-fill-pointer-p vector))
- (if (> new (%array-available-elements vector))
- (error
- "The new fill pointer, ~S, is larger than the length of the vector."
- new)
- (setf (%array-fill-pointer vector) new))
- (error 'simple-type-error
- :datum vector
- :expected-type '(and vector (satisfies array-has-fill-pointer-p))
- :format-control "~S is not an array with a fill pointer."
- :format-arguments (list vector))))
+ (flet ((oops (x)
+ (fill-pointer-error vector x)))
+ (if (array-has-fill-pointer-p vector)
+ (if (> new (%array-available-elements vector))
+ (oops new)
+ (setf (%array-fill-pointer vector) new))
+ (oops nil))))
;;; FIXME: It'd probably make sense to use a MACROLET to share the
;;; guts of VECTOR-PUSH between VECTOR-PUSH-EXTEND. Such a macro
to NEW-EL, and increment the fill pointer by one. If the fill pointer is
too large, NIL is returned, otherwise the index of the pushed element is
returned."
- (declare (vector array))
(let ((fill-pointer (fill-pointer array)))
(declare (fixnum fill-pointer))
(cond ((= fill-pointer (%array-available-elements array))
nil)
(t
- (setf (aref array fill-pointer) new-el)
+ (locally (declare (optimize (safety 0)))
+ (setf (aref array fill-pointer) new-el))
(setf (%array-fill-pointer array) (1+ fill-pointer))
fill-pointer))))
(defun vector-push-extend (new-element
vector
&optional
- (extension (1+ (length vector))))
- (declare (vector vector) (fixnum extension))
+ (min-extension
+ (let ((length (length vector)))
+ (min (1+ length)
+ (- array-dimension-limit length)))))
+ (declare (fixnum min-extension))
(let ((fill-pointer (fill-pointer vector)))
(declare (fixnum fill-pointer))
(when (= fill-pointer (%array-available-elements vector))
- (adjust-array vector (+ fill-pointer extension)))
+ (adjust-array vector (+ fill-pointer (max 1 min-extension))))
;; disable bounds checking
(locally (declare (optimize (safety 0)))
(setf (aref vector fill-pointer) new-element))
#!+sb-doc
"Decrease the fill pointer by 1 and return the element pointed to by the
new fill pointer."
- (declare (vector array))
(let ((fill-pointer (fill-pointer array)))
(declare (fixnum fill-pointer))
(if (zerop fill-pointer)
displaced-to displaced-index-offset)
#!+sb-doc
"Adjust ARRAY's dimensions to the given DIMENSIONS and stuff."
+ (when (invalid-array-p array)
+ (invalid-array-error array))
(let ((dimensions (if (listp dimensions) dimensions (list dimensions))))
(cond ((/= (the fixnum (length (the list dimensions)))
(the fixnum (array-rank array)))
(set-array-header array array-data array-size
(get-new-fill-pointer array array-size
fill-pointer)
- 0 dimensions nil)
+ 0 dimensions nil nil)
(if (array-header-p array)
;; simple multidimensional or single dimensional array
(make-array dimensions
(set-array-header array displaced-to array-size
(get-new-fill-pointer array array-size
fill-pointer)
- displacement dimensions t)
+ displacement dimensions t nil)
;; simple multidimensional or single dimensional array
(make-array dimensions
:element-type element-type
(set-array-header array new-data new-length
(get-new-fill-pointer array new-length
fill-pointer)
- 0 dimensions nil)
+ 0 dimensions nil nil)
new-data))))
(t
(let ((old-length (%array-available-elements array))
initial-element-p))
(if (adjustable-array-p array)
(set-array-header array new-data new-length
- new-length 0 dimensions nil)
+ nil 0 dimensions nil nil)
(let ((new-array
(make-array-header
sb!vm:simple-array-widetag array-rank)))
(set-array-header new-array new-data new-length
- new-length 0 dimensions nil)))))))))))
+ nil 0 dimensions nil t)))))))))))
(defun get-new-fill-pointer (old-array new-array-size fill-pointer)
vector)
(t (subseq vector 0 new-length))))
+;;; BIG THREAD SAFETY NOTE
+;;;
+;;; ADJUST-ARRAY/SET-ARRAY-HEADER, and its callees are very
+;;; thread unsafe. They are nonatomic, and can mess with parallel
+;;; code using the same arrays.
+;;;
+;;; A likely seeming fix is an additional level of indirection:
+;;; ARRAY-HEADER -> ARRAY-INFO -> ... where ARRAY-HEADER would
+;;; hold nothing but the pointer to ARRAY-INFO, and ARRAY-INFO
+;;; would hold everything ARRAY-HEADER now holds. This allows
+;;; consing up a new ARRAY-INFO and replacing it atomically in
+;;; the ARRAY-HEADER.
+;;;
+;;; %WALK-DISPLACED-ARRAY-BACKPOINTERS is an especially nasty
+;;; one: not only is it needed extremely rarely, which makes
+;;; any thread safety bugs involving it look like rare random
+;;; corruption, but because it walks the chain *upwards*, which
+;;; may violate user expectations.
+
+(defun %save-displaced-array-backpointer (array data)
+ (flet ((purge (pointers)
+ (remove-if (lambda (value)
+ (or (not value) (eq array value)))
+ pointers
+ :key #'weak-pointer-value)))
+ ;; Add backpointer to the new data vector if it has a header.
+ (when (array-header-p data)
+ (setf (%array-displaced-from data)
+ (cons (make-weak-pointer array)
+ (purge (%array-displaced-from data)))))
+ ;; Remove old backpointer, if any.
+ (let ((old-data (%array-data-vector array)))
+ (when (and (neq data old-data) (array-header-p old-data))
+ (setf (%array-displaced-from old-data)
+ (purge (%array-displaced-from old-data)))))))
+
+(defun %walk-displaced-array-backpointers (array new-length)
+ (dolist (p (%array-displaced-from array))
+ (let ((from (weak-pointer-value p)))
+ (when (and from (eq array (%array-data-vector from)))
+ (let ((requires (+ (%array-available-elements from)
+ (%array-displacement from))))
+ (unless (>= new-length requires)
+ ;; ANSI sayeth (ADJUST-ARRAY dictionary entry):
+ ;;
+ ;; "If A is displaced to B, the consequences are unspecified if B is
+ ;; adjusted in such a way that it no longer has enough elements to
+ ;; satisfy A.
+ ;;
+ ;; since we're hanging on a weak pointer here, we can't signal an
+ ;; error right now: the array that we're looking at might be
+ ;; garbage. Instead, we set all dimensions to zero so that next
+ ;; safe access to the displaced array will trap. Additionally, we
+ ;; save the original dimensions, so we can signal a more
+ ;; understandable error when the time comes.
+ (%walk-displaced-array-backpointers from 0)
+ (setf (%array-fill-pointer from) 0
+ (%array-available-elements from) 0
+ (%array-displaced-p from) (array-dimensions array))
+ (dotimes (i (%array-rank from))
+ (setf (%array-dimension from i) 0))))))))
+
;;; Fill in array header with the provided information, and return the array.
(defun set-array-header (array data length fill-pointer displacement dimensions
- &optional displacedp)
+ displacedp newp)
+ (if newp
+ (setf (%array-displaced-from array) nil)
+ (%walk-displaced-array-backpointers array length))
+ (when displacedp
+ (%save-displaced-array-backpointer array data))
(setf (%array-data-vector array) data)
(setf (%array-available-elements array) length)
(cond (fill-pointer
(setf (%array-dimension array 0) dimensions))
(setf (%array-displaced-p array) displacedp)
array)
+
+;;; User visible extension
+(declaim (ftype (function (array) (values (simple-array * (*)) &optional))
+ array-storage-vector))
+(defun array-storage-vector (array)
+ "Returns the underlying storage vector of ARRAY, which must be a non-displaced array.
+
+In SBCL, if ARRAY is a of type \(SIMPLE-ARRAY * \(*)), it is its own storage
+vector. Multidimensional arrays, arrays with fill pointers, and adjustable
+arrays have an underlying storage vector with the same ARRAY-ELEMENT-TYPE as
+ARRAY, which this function returns.
+
+Important note: the underlying vector is an implementation detail. Even though
+this function exposes it, changes in the implementation may cause this
+function to be removed without further warning."
+ ;; KLUDGE: Without TRULY-THE the system is not smart enough to figure out that
+ ;; the return value is always of the known type.
+ (truly-the (simple-array * (*))
+ (if (array-header-p array)
+ (if (%array-displaced-p array)
+ (error "~S cannot be used with displaced arrays. Use ~S instead."
+ 'array-storage-vector 'array-displacement)
+ (%array-data-vector array))
+ array)))
\f
-;;;; ZAP-ARRAY-DATA for ADJUST-ARRAY
-;;; a temporary to be used when OLD-DATA and NEW-DATA are EQ.
-;;; KLUDGE: Boy, DYNAMIC-EXTENT would be nice. This is rebound
-;;; to length zero array in each new thread.
-;;;
-;;; DX is probably a bad idea, because a with a big array it would
-;;; be fairly easy to blow the stack.
-;;;
-;;; Rebound per thread.
-(defvar *zap-array-data-temp* (make-array 1000 :initial-element t))
-
-(defun zap-array-data-temp (length element-type initial-element
- initial-element-p)
- (declare (fixnum length))
- (when (> length (the fixnum (length *zap-array-data-temp*)))
- (setf *zap-array-data-temp*
- (make-array length :initial-element t)))
- (when initial-element-p
- (unless (typep initial-element element-type)
- (error "~S can't be used to initialize an array of type ~S."
- initial-element element-type))
- (fill (the simple-vector *zap-array-data-temp*) initial-element
- :end length))
- *zap-array-data-temp*)
+;;;; ZAP-ARRAY-DATA for ADJUST-ARRAY
;;; This does the grinding work for ADJUST-ARRAY. It zaps the data
;;; from the OLD-DATA in an arrangement specified by the OLD-DIMS to
;;; the NEW-DATA in an arrangement specified by the NEW-DIMS. OFFSET
;;; is a displaced offset to be added to computed indices of OLD-DATA.
-;;; NEW-LENGTH, ELEMENT-TYPE, INITIAL-ELEMENT, and INITIAL-ELEMENT-P
-;;; are used when OLD-DATA and NEW-DATA are EQ; in this case, a
-;;; temporary must be used and filled appropriately. When OLD-DATA and
-;;; NEW-DATA are not EQ, NEW-DATA has already been filled with any
-;;; specified initial-element.
(defun zap-array-data (old-data old-dims offset new-data new-dims new-length
element-type initial-element initial-element-p)
- (declare (list old-dims new-dims))
- (setq old-dims (nreverse old-dims))
- (setq new-dims (reverse new-dims))
- (if (eq old-data new-data)
- (let ((temp (zap-array-data-temp new-length element-type
- initial-element initial-element-p)))
- (zap-array-data-aux old-data old-dims offset temp new-dims)
- (dotimes (i new-length) (setf (aref new-data i) (aref temp i))))
- (zap-array-data-aux old-data old-dims offset new-data new-dims)))
+ (declare (list old-dims new-dims)
+ (fixnum new-length))
+ ;; OLD-DIMS comes from array-dimensions, which returns a fresh list
+ ;; at least in SBCL.
+ ;; NEW-DIMS comes from the user.
+ (setf old-dims (nreverse old-dims)
+ new-dims (reverse new-dims))
+ (cond ((eq old-data new-data)
+ ;; NEW-LENGTH, ELEMENT-TYPE, INITIAL-ELEMENT, and
+ ;; INITIAL-ELEMENT-P are used when OLD-DATA and NEW-DATA are
+ ;; EQ; in this case, a temporary must be used and filled
+ ;; appropriately. specified initial-element.
+ (when initial-element-p
+ ;; FIXME: transforming this TYPEP to someting a bit faster
+ ;; would be a win...
+ (unless (typep initial-element element-type)
+ (error "~S can't be used to initialize an array of type ~S."
+ initial-element element-type)))
+ (let ((temp (if initial-element-p
+ (make-array new-length :initial-element initial-element)
+ (make-array new-length))))
+ (declare (simple-vector temp))
+ (zap-array-data-aux old-data old-dims offset temp new-dims)
+ (dotimes (i new-length)
+ (setf (aref new-data i) (aref temp i)))
+ ;; Kill the temporary vector to prevent garbage retention.
+ (%shrink-vector temp 0)))
+ (t
+ ;; When OLD-DATA and NEW-DATA are not EQ, NEW-DATA has
+ ;; already been filled with any
+ (zap-array-data-aux old-data old-dims offset new-data new-dims))))
(defun zap-array-data-aux (old-data old-dims offset new-data new-dims)
(declare (fixnum offset))
(declare (type index src-index dst-index))
(setf (sbit dst dst-index)
(logxor (sbit src src-index) 1))))))))
+
+;;;; array type dispatching
+
+;;; Store some saetp fields for DEFINE-ARRAY-DISPATCH since
+;;; sb!vm:*specialized-array-element-type-properties* is not always
+;;; available.
+(macrolet
+ ((define-saetp-info ()
+ `(eval-when (:compile-toplevel :load-toplevel :execute)
+ (defglobal %%saetp-info%%
+ ',(loop for saetp
+ across sb!vm:*specialized-array-element-type-properties*
+ collect `(,(sb!vm:saetp-typecode saetp)
+ ,(sb!vm:saetp-specifier saetp)
+ ,(sb!vm:saetp-primitive-type-name saetp)))))))
+ (define-saetp-info))
+
+;;; Given DISPATCH-FOO as the DISPATCH-NAME argument (unevaluated),
+;;; defines the functions
+;;;
+;;; DISPATCH-FOO/SIMPLE-BASE-STRING
+;;; DISPATCH-FOO/SIMPLE-CHARACTER-STRING
+;;; DISPATCH-FOO/SIMPLE-ARRAY-SINGLE-FLOAT
+;;; ...
+;;;
+;;; PARAMS are the function parameters in the definition of each
+;;; specializer function. The array being specialized must be the
+;;; first parameter in PARAMS. A type declaration for this parameter
+;;; is automatically inserted into the body of each function.
+;;;
+;;; The dispatch table %%FOO-FUNS%% is defined and populated by these
+;;; functions. The table is padded by the function
+;;; HAIRY-FOO-DISPATCH-ERROR, also defined by DEFINE-ARRAY-DISPATCH.
+;;;
+;;; Finally, the DISPATCH-FOO macro is defined which does the actual
+;;; dispatching when called. It expects arguments that match PARAMS.
+;;;
+(defmacro define-array-dispatch (dispatch-name params &body body)
+ (let ((table-name (symbolicate "%%" dispatch-name "-FUNS%%"))
+ (error-name (symbolicate "HAIRY-" dispatch-name "-ERROR")))
+ `(progn
+ (eval-when (:compile-toplevel :load-toplevel :execute)
+ (defun ,error-name (&rest args)
+ (error 'type-error
+ :datum (first args)
+ :expected-type '(simple-array * (*)))))
+ (defglobal ,table-name (make-array ,(1+ sb!vm:widetag-mask)
+ :initial-element #',error-name))
+ ,@(loop for (typecode specifier primitive-type-name) in %%saetp-info%%
+ collect (let ((fun-name (symbolicate (string dispatch-name)
+ "/" primitive-type-name)))
+ `(progn
+ (defun ,fun-name ,params
+ (declare (type (simple-array ,specifier (*))
+ ,(first params)))
+ ,@body)
+ (setf (svref ,table-name ,typecode) #',fun-name))))
+ (defmacro ,dispatch-name (&rest args)
+ (check-type (first args) symbol)
+ (let ((tag (gensym "TAG")))
+ `(funcall
+ (the function
+ (let ((,tag 0))
+ (when (sb!vm::%other-pointer-p ,(first args))
+ (setf ,tag (%other-pointer-widetag ,(first args))))
+ (svref ,',table-name ,tag)))
+ ,@args))))))
projects / sbcl.git / blobdiff