1 ;;;; functions to implement arrays
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
12 (in-package "SB!IMPL")
15 (declaim (inline fill-pointer array-has-fill-pointer-p adjustable-array-p
18 ;;;; miscellaneous accessor functions
20 ;;; These functions are only needed by the interpreter, 'cause the
21 ;;; compiler inlines them.
22 (macrolet ((def (name)
26 (defun (setf ,name) (value array)
27 (setf (,name array) value)))))
28 (def %array-fill-pointer)
29 (def %array-fill-pointer-p)
30 (def %array-available-elements)
31 (def %array-data-vector)
32 (def %array-displacement)
33 (def %array-displaced-p))
35 (defun %array-rank (array)
38 (defun %array-dimension (array axis)
39 (%array-dimension array axis))
41 (defun %set-array-dimension (array axis value)
42 (%set-array-dimension array axis value))
44 (defun %check-bound (array bound index)
45 (declare (type index bound)
47 (%check-bound array bound index))
49 (defun %with-array-data (array start end)
50 (%with-array-data-macro array start end :fail-inline? t))
52 (defun %data-vector-and-index (array index)
53 (if (array-header-p array)
54 (multiple-value-bind (vector index)
55 (%with-array-data array index nil)
56 (values vector index))
57 (values array index)))
59 ;;; It'd waste space to expand copies of error handling in every
60 ;;; inline %WITH-ARRAY-DATA, so we have them call this function
61 ;;; instead. This is just a wrapper which is known never to return.
62 (defun failed-%with-array-data (array start end)
63 (declare (notinline %with-array-data))
64 (%with-array-data array start end)
65 (bug "called FAILED-%WITH-ARRAY-DATA with valid array parameters?"))
68 (eval-when (:compile-toplevel :execute)
69 (sb!xc:defmacro pick-vector-type (type &rest specs)
70 `(cond ,@(mapcar (lambda (spec)
71 `(,(if (eq (car spec) t)
73 `(subtypep ,type ',(car spec)))
77 ;;; These functions are used in the implementation of MAKE-ARRAY for
78 ;;; complex arrays. There are lots of transforms to simplify
79 ;;; MAKE-ARRAY for various easy cases, but not for all reasonable
80 ;;; cases, so e.g. as of sbcl-0.6.6 we still make full calls to
81 ;;; MAKE-ARRAY for any non-simple array. Thus, there's some value to
82 ;;; making this somewhat efficient, at least not doing full calls to
83 ;;; SUBTYPEP in the easy cases.
84 (defun %vector-widetag-and-n-bits (type)
86 ;; Pick off some easy common cases.
88 ;; (Perhaps we should make a much more exhaustive table of easy
89 ;; common cases here. Or perhaps the effort would be better spent
90 ;; on smarter compiler transforms which do the calculation once
91 ;; and for all in any reasonable user programs.)
93 (values #.sb!vm:simple-vector-widetag #.sb!vm:n-word-bits))
94 ((base-char standard-char #!-sb-unicode character)
95 (values #.sb!vm:simple-base-string-widetag #.sb!vm:n-byte-bits))
98 (values #.sb!vm:simple-character-string-widetag #.sb!vm:n-word-bits))
100 (values #.sb!vm:simple-bit-vector-widetag 1))
101 ;; OK, we have to wade into SUBTYPEPing after all.
103 #.`(pick-vector-type type
106 `(,(sb!vm:saetp-specifier saetp)
107 (values ,(sb!vm:saetp-typecode saetp)
108 ,(sb!vm:saetp-n-bits saetp))))
109 sb!vm:*specialized-array-element-type-properties*)))))
111 (defun %complex-vector-widetag (type)
113 ;; Pick off some easy common cases.
115 #.sb!vm:complex-vector-widetag)
116 ((base-char #!-sb-unicode character)
117 #.sb!vm:complex-base-string-widetag)
120 #.sb!vm:complex-character-string-widetag)
122 #.sb!vm:complex-vector-nil-widetag)
124 #.sb!vm:complex-bit-vector-widetag)
125 ;; OK, we have to wade into SUBTYPEPing after all.
127 (pick-vector-type type
128 (nil #.sb!vm:complex-vector-nil-widetag)
130 (character #.sb!vm:complex-base-string-widetag)
132 (base-char #.sb!vm:complex-base-string-widetag)
134 (character #.sb!vm:complex-character-string-widetag)
135 (bit #.sb!vm:complex-bit-vector-widetag)
136 (t #.sb!vm:complex-vector-widetag)))))
138 (defun make-array (dimensions &key
140 (initial-element nil initial-element-p)
141 (initial-contents nil initial-contents-p)
142 adjustable fill-pointer
143 displaced-to displaced-index-offset)
144 (let* ((dimensions (if (listp dimensions) dimensions (list dimensions)))
145 (array-rank (length (the list dimensions)))
146 (simple (and (null fill-pointer)
148 (null displaced-to))))
149 (declare (fixnum array-rank))
150 (when (and displaced-index-offset (null displaced-to))
151 (error "can't specify :DISPLACED-INDEX-OFFSET without :DISPLACED-TO"))
152 (when (and displaced-to
153 (arrayp displaced-to)
154 (not (equal (array-element-type displaced-to)
155 (upgraded-array-element-type element-type))))
156 (error "Array element type of :DISPLACED-TO array does not match specified element type"))
157 (if (and simple (= array-rank 1))
158 ;; it's a (SIMPLE-ARRAY * (*))
159 (multiple-value-bind (type n-bits)
160 (%vector-widetag-and-n-bits element-type)
161 (declare (type (unsigned-byte 8) type)
162 (type (integer 0 256) n-bits))
163 (let* ((length (car dimensions))
164 (array (allocate-vector
168 (* (if (or (= type sb!vm:simple-base-string-widetag)
171 sb!vm:simple-character-string-widetag))
175 sb!vm:n-word-bits))))
176 (declare (type index length))
177 (when initial-element-p
178 (fill array initial-element))
179 (when initial-contents-p
180 (when initial-element-p
181 (error "can't specify both :INITIAL-ELEMENT and ~
183 (unless (= length (length initial-contents))
184 (error "There are ~W elements in the :INITIAL-CONTENTS, but ~
185 the vector length is ~W."
186 (length initial-contents)
188 (replace array initial-contents))
190 ;; it's either a complex array or a multidimensional array.
191 (let* ((total-size (reduce #'* dimensions))
192 (data (or displaced-to
193 (data-vector-from-inits
194 dimensions total-size element-type
195 initial-contents initial-contents-p
196 initial-element initial-element-p)))
197 (array (make-array-header
198 (cond ((= array-rank 1)
199 (%complex-vector-widetag element-type))
200 (simple sb!vm:simple-array-widetag)
201 (t sb!vm:complex-array-widetag))
204 (unless (= array-rank 1)
205 (error "Only vectors can have fill pointers."))
206 (let ((length (car dimensions)))
207 (declare (fixnum length))
208 (setf (%array-fill-pointer array)
209 (cond ((eq fill-pointer t)
212 (unless (and (fixnump fill-pointer)
214 (<= fill-pointer length))
215 ;; FIXME: should be TYPE-ERROR?
216 (error "invalid fill-pointer ~W"
219 (setf (%array-fill-pointer-p array) t))
221 (setf (%array-fill-pointer array) total-size)
222 (setf (%array-fill-pointer-p array) nil)))
223 (setf (%array-available-elements array) total-size)
224 (setf (%array-data-vector array) data)
226 (when (or initial-element-p initial-contents-p)
227 (error "Neither :INITIAL-ELEMENT nor :INITIAL-CONTENTS ~
228 can be specified along with :DISPLACED-TO"))
229 (let ((offset (or displaced-index-offset 0)))
230 (when (> (+ offset total-size)
231 (array-total-size displaced-to))
232 (error "~S doesn't have enough elements." displaced-to))
233 (setf (%array-displacement array) offset)
234 (setf (%array-displaced-p array) t)))
236 (setf (%array-displaced-p array) nil)))
238 (dolist (dim dimensions)
239 (setf (%array-dimension array axis) dim)
243 (defun make-static-vector (length &key
244 (element-type '(unsigned-byte 8))
245 (initial-contents nil initial-contents-p)
246 (initial-element nil initial-element-p))
247 "Allocate vector of LENGTH elements in static space. Only allocation
248 of specialized arrays is supported."
249 ;; STEP 1: check inputs fully
251 ;; This way of doing explicit checks before the vector is allocated
252 ;; is expensive, but probably worth the trouble as once we've allocated
253 ;; the vector we have no way to get rid of it anymore...
254 (when (eq t (upgraded-array-element-type element-type))
255 (error "Static arrays of type ~S not supported."
257 (when initial-contents-p
258 (when initial-element-p
259 (error "can't specify both :INITIAL-ELEMENT and :INITIAL-CONTENTS"))
260 (unless (= length (length initial-contents))
261 (error "There are ~W elements in the :INITIAL-CONTENTS, but the ~
262 vector length is ~W."
263 (length initial-contents)
265 (unless (every (lambda (x) (typep x element-type)) initial-contents)
266 (error ":INITIAL-CONTENTS contains elements not of type ~S."
268 (when initial-element-p
269 (unless (typep initial-element element-type)
270 (error ":INITIAL-ELEMENT ~S is not of type ~S."
271 initial-element element-type)))
274 ;; Allocate and possibly initialize the vector.
275 (multiple-value-bind (type n-bits)
276 (sb!impl::%vector-widetag-and-n-bits element-type)
278 (allocate-static-vector type length
279 (ceiling (* length n-bits)
280 sb!vm:n-word-bits))))
281 (cond (initial-element-p
282 (fill vector initial-element))
284 (replace vector initial-contents))
288 ;;; DATA-VECTOR-FROM-INITS returns a simple vector that has the
289 ;;; specified array characteristics. Dimensions is only used to pass
290 ;;; to FILL-DATA-VECTOR for error checking on the structure of
291 ;;; initial-contents.
292 (defun data-vector-from-inits (dimensions total-size element-type
293 initial-contents initial-contents-p
294 initial-element initial-element-p)
295 (when (and initial-contents-p initial-element-p)
296 (error "cannot supply both :INITIAL-CONTENTS and :INITIAL-ELEMENT to
297 either MAKE-ARRAY or ADJUST-ARRAY."))
298 (let ((data (if initial-element-p
299 (make-array total-size
300 :element-type element-type
301 :initial-element initial-element)
302 (make-array total-size
303 :element-type element-type))))
304 (cond (initial-element-p
305 (unless (simple-vector-p data)
306 (unless (typep initial-element element-type)
307 (error "~S cannot be used to initialize an array of type ~S."
308 initial-element element-type))
309 (fill (the vector data) initial-element)))
311 (fill-data-vector data dimensions initial-contents)))
314 (defun vector (&rest objects)
316 "Construct a SIMPLE-VECTOR from the given objects."
317 (coerce (the list objects) 'simple-vector))
320 ;;;; accessor/setter functions
322 ;;; Dispatch to an optimized routine the data vector accessors for
323 ;;; each different specialized vector type. Do dispatching by looking
324 ;;; up the widetag in the array rather than with the typecases, which
325 ;;; as of 1.0.5 compiles to a naive sequence of linear TYPEPs. Also
326 ;;; provide separate versions where bounds checking has been moved
327 ;;; from the callee to the caller, since it's much cheaper to do once
328 ;;; the type information is available. Finally, for each of these
329 ;;; routines also provide a slow path, taken for arrays that are not
330 ;;; vectors or not simple.
331 (macrolet ((define (accessor-name slow-accessor-name table-name extra-params
335 (defun ,accessor-name (array index ,@extra-params)
336 (declare (optimize speed
337 ;; (SAFETY 0) is ok. All calls to
338 ;; these functions are generated by
339 ;; the compiler, so argument count
340 ;; checking isn't needed. Type checking
341 ;; is done implicitly via the widetag
344 #1=(funcall (the function
346 ;; WIDETAG-OF needs extra code to
347 ;; handle LIST and FUNCTION
348 ;; lowtags. We're only dispatching
349 ;; on other pointers, so let's do
350 ;; the lowtag extraction manually.
351 (when (sb!vm::%other-pointer-p array)
352 (setf tag (sb!sys:sap-ref-8
353 (int-sap (get-lisp-obj-address array))
354 (- sb!vm:other-pointer-lowtag))))
355 ;; SYMBOL-GLOBAL-VALUE is a performance hack
356 ;; for threaded builds.
357 (svref (sb!vm::symbol-global-value ',table-name)
359 array index ,@extra-params))
360 (defun ,slow-accessor-name (array index ,@extra-params)
361 (declare (optimize speed (safety 0)))
362 (if (not (%array-displaced-p array))
363 ;; The reasonably quick path of non-displaced complex
365 (let ((array (%array-data-vector array)))
367 ;; The real slow path.
371 (declare (optimize (speed 1) (safety 1)))
372 (,@check-bounds index)))
375 (declare (ignore end))
376 (,accessor-name vector index ,@extra-params)))))))
377 (define hairy-data-vector-ref slow-hairy-data-vector-ref
378 *data-vector-reffers* nil (progn))
379 (define hairy-data-vector-set slow-hairy-data-vector-set
380 *data-vector-setters* (new-value) (progn))
381 (define hairy-data-vector-ref/check-bounds
382 slow-hairy-data-vector-ref/check-bounds
383 *data-vector-reffers/check-bounds* nil
384 (%check-bound array (array-dimension array 0)))
385 (define hairy-data-vector-set/check-bounds
386 slow-hairy-data-vector-set/check-bounds
387 *data-vector-setters/check-bounds* (new-value)
388 (%check-bound array (array-dimension array 0))))
390 (defun hairy-ref-error (array index &optional new-value)
391 (declare (ignore index new-value))
394 :expected-type 'vector))
396 ;;; Populate the dispatch tables.
397 (macrolet ((define-reffer (saetp check-form)
398 (let* ((type (sb!vm:saetp-specifier saetp))
399 (atype `(simple-array ,type (*))))
400 `(named-lambda optimized-data-vector-ref (vector index)
401 (declare (optimize speed (safety 0)))
402 (data-vector-ref (the ,atype vector)
404 (declare (optimize (safety 1)))
406 (,@check-form index)))))))
407 (define-setter (saetp check-form)
408 (let* ((type (sb!vm:saetp-specifier saetp))
409 (atype `(simple-array ,type (*))))
410 `(named-lambda optimized-data-vector-set (vector index new-value)
411 (declare (optimize speed (safety 0)))
412 (data-vector-set (the ,atype vector)
414 (declare (optimize (safety 1)))
416 (,@check-form index)))
418 ;; SPEED 1 needed to avoid the compiler
419 ;; from downgrading the type check to
421 (declare (optimize (speed 1)
423 (the ,type new-value)))
424 ;; For specialized arrays, the return from
425 ;; data-vector-set would have to be reboxed to be a
426 ;; (Lisp) return value; instead, we use the
427 ;; already-boxed value as the return.
429 (define-reffers (symbol deffer check-form slow-path)
431 (setf ,symbol (make-array sb!vm::widetag-mask
432 :initial-element #'hairy-ref-error))
433 ,@(loop for widetag in '(sb!vm:complex-vector-widetag
434 sb!vm:complex-vector-nil-widetag
435 sb!vm:complex-bit-vector-widetag
436 sb!vm:complex-character-string-widetag
437 sb!vm:complex-base-string-widetag
438 sb!vm:simple-array-widetag
439 sb!vm:complex-array-widetag)
440 collect `(setf (svref ,symbol ,widetag) ,slow-path))
441 ,@(loop for saetp across sb!vm:*specialized-array-element-type-properties*
442 for widetag = (sb!vm:saetp-typecode saetp)
443 collect `(setf (svref ,symbol ,widetag)
444 (,deffer ,saetp ,check-form))))))
445 (defun !hairy-data-vector-reffer-init ()
446 (define-reffers *data-vector-reffers* define-reffer
448 #'slow-hairy-data-vector-ref)
449 (define-reffers *data-vector-setters* define-setter
451 #'slow-hairy-data-vector-set)
452 (define-reffers *data-vector-reffers/check-bounds* define-reffer
453 (%check-bound vector (length vector))
454 #'slow-hairy-data-vector-ref/check-bounds)
455 (define-reffers *data-vector-setters/check-bounds* define-setter
456 (%check-bound vector (length vector))
457 #'slow-hairy-data-vector-set/check-bounds)))
459 ;;; (Ordinary DATA-VECTOR-REF usage compiles into a vop, but
460 ;;; DATA-VECTOR-REF is also FOLDABLE, and this ordinary function
461 ;;; definition is needed for the compiler to use in constant folding.)
462 (defun data-vector-ref (array index)
463 (hairy-data-vector-ref array index))
465 ;;; SUBSCRIPTS has a dynamic-extent list structure and is destroyed
466 (defun %array-row-major-index (array subscripts
467 &optional (invalid-index-error-p t))
468 (declare (array array)
470 (let ((rank (array-rank array)))
471 (unless (= rank (length subscripts))
472 (error "wrong number of subscripts, ~W, for array of rank ~W"
473 (length subscripts) rank))
474 (if (array-header-p array)
475 (do ((subs (nreverse subscripts) (cdr subs))
476 (axis (1- (array-rank array)) (1- axis))
480 (declare (list subs) (fixnum axis chunk-size result))
481 (let ((index (car subs))
482 (dim (%array-dimension array axis)))
483 (declare (fixnum dim))
484 (unless (and (fixnump index) (< -1 index dim))
485 (if invalid-index-error-p
486 (error 'simple-type-error
487 :format-control "invalid index ~W~[~;~:; on axis ~:*~W~] in ~S"
488 :format-arguments (list index axis array)
490 :expected-type `(integer 0 (,dim)))
491 (return-from %array-row-major-index nil)))
492 (incf result (* chunk-size (the fixnum index)))
493 (setf chunk-size (* chunk-size dim))))
494 (let ((index (first subscripts))
495 (length (length (the (simple-array * (*)) array))))
496 (unless (and (fixnump index) (< -1 index length))
497 (if invalid-index-error-p
498 ;; FIXME: perhaps this should share a format-string
499 ;; with INVALID-ARRAY-INDEX-ERROR or
500 ;; INDEX-TOO-LARGE-ERROR?
501 (error 'simple-type-error
502 :format-control "invalid index ~W in ~S"
503 :format-arguments (list index array)
505 :expected-type `(integer 0 (,length)))
506 (return-from %array-row-major-index nil)))
509 (defun array-in-bounds-p (array &rest subscripts)
511 "Return T if the SUBSCIPTS are in bounds for the ARRAY, NIL otherwise."
512 (if (%array-row-major-index array subscripts nil)
515 (defun array-row-major-index (array &rest subscripts)
516 (declare (dynamic-extent subscripts))
517 (%array-row-major-index array subscripts))
519 (defun aref (array &rest subscripts)
521 "Return the element of the ARRAY specified by the SUBSCRIPTS."
522 (declare (dynamic-extent subscripts))
523 (row-major-aref array (%array-row-major-index array subscripts)))
525 (defun %aset (array &rest stuff)
526 (declare (dynamic-extent stuff))
527 (let ((subscripts (butlast stuff))
528 (new-value (car (last stuff))))
529 (setf (row-major-aref array (%array-row-major-index array subscripts))
532 ;;; FIXME: What's supposed to happen with functions
533 ;;; like AREF when we (DEFUN (SETF FOO) ..) when
534 ;;; DEFSETF FOO is also defined? It seems as though the logical
535 ;;; thing to do would be to nuke the macro definition for (SETF FOO)
536 ;;; and replace it with the (SETF FOO) function, issuing a warning,
537 ;;; just as for ordinary functions
538 ;;; * (LISP-IMPLEMENTATION-VERSION)
539 ;;; "18a+ release x86-linux 2.4.7 6 November 1998 cvs"
540 ;;; * (DEFMACRO ZOO (X) `(+ ,X ,X))
542 ;;; * (DEFUN ZOO (X) (* 3 X))
543 ;;; Warning: ZOO previously defined as a macro.
545 ;;; But that doesn't seem to be what happens in CMU CL.
547 ;;; KLUDGE: this is probably because ANSI, in its wisdom (CLHS
548 ;;; 5.1.2.5) requires implementations to support
549 ;;; (SETF (APPLY #'AREF ...) ...)
550 ;;; [and also #'BIT and #'SBIT]. Yes, this is terrifying, and it's
551 ;;; also terrifying that this sequence of definitions causes it to
554 ;;; Also, it would be nice to make DESCRIBE FOO tell whether a symbol
555 ;;; has a setf expansion and/or a setf function defined.
557 #!-sb-fluid (declaim (inline (setf aref)))
558 (defun (setf aref) (new-value array &rest subscripts)
559 (declare (dynamic-extent subscripts))
560 (declare (type array array))
561 (setf (row-major-aref array (%array-row-major-index array subscripts))
564 (defun row-major-aref (array index)
566 "Return the element of array corressponding to the row-major index. This is
568 (declare (optimize (safety 1)))
569 (row-major-aref array index))
571 (defun %set-row-major-aref (array index new-value)
572 (declare (optimize (safety 1)))
573 (setf (row-major-aref array index) new-value))
575 (defun svref (simple-vector index)
577 "Return the INDEX'th element of the given Simple-Vector."
578 (declare (optimize (safety 1)))
579 (aref simple-vector index))
581 (defun %svset (simple-vector index new)
582 (declare (optimize (safety 1)))
583 (setf (aref simple-vector index) new))
585 (defun bit (bit-array &rest subscripts)
587 "Return the bit from the BIT-ARRAY at the specified SUBSCRIPTS."
588 (declare (type (array bit) bit-array) (optimize (safety 1)))
589 (row-major-aref bit-array (%array-row-major-index bit-array subscripts)))
591 (defun %bitset (bit-array &rest stuff)
592 (declare (type (array bit) bit-array) (optimize (safety 1)))
593 (let ((subscripts (butlast stuff))
594 (new-value (car (last stuff))))
595 (setf (row-major-aref bit-array
596 (%array-row-major-index bit-array subscripts))
599 #!-sb-fluid (declaim (inline (setf bit)))
600 (defun (setf bit) (new-value bit-array &rest subscripts)
601 (declare (type (array bit) bit-array) (optimize (safety 1)))
602 (setf (row-major-aref bit-array
603 (%array-row-major-index bit-array subscripts))
606 (defun sbit (simple-bit-array &rest subscripts)
608 "Return the bit from SIMPLE-BIT-ARRAY at the specified SUBSCRIPTS."
609 (declare (type (simple-array bit) simple-bit-array) (optimize (safety 1)))
610 (row-major-aref simple-bit-array
611 (%array-row-major-index simple-bit-array subscripts)))
613 ;;; KLUDGE: Not all these things (%SET-ROW-MAJOR-AREF, %SET-FILL-POINTER,
614 ;;; %SET-FDEFINITION, %SCHARSET, %SBITSET..) seem to deserve separate names.
615 ;;; Could we just DEFUN (SETF SBIT) etc. and get rid of the non-ANSI names?
617 (defun %sbitset (simple-bit-array &rest stuff)
618 (declare (type (simple-array bit) simple-bit-array) (optimize (safety 1)))
619 (let ((subscripts (butlast stuff))
620 (new-value (car (last stuff))))
621 (setf (row-major-aref simple-bit-array
622 (%array-row-major-index simple-bit-array subscripts))
625 #!-sb-fluid (declaim (inline (setf sbit)))
626 (defun (setf sbit) (new-value bit-array &rest subscripts)
627 (declare (type (simple-array bit) bit-array) (optimize (safety 1)))
628 (setf (row-major-aref bit-array
629 (%array-row-major-index bit-array subscripts))
632 ;;;; miscellaneous array properties
634 (defun array-element-type (array)
636 "Return the type of the elements of the array"
637 (let ((widetag (widetag-of array)))
638 (macrolet ((pick-element-type (&rest stuff)
639 `(cond ,@(mapcar (lambda (stuff)
641 (let ((item (car stuff)))
650 `(= widetag ,item))))
653 #.`(pick-element-type
656 `(,(if (sb!vm:saetp-complex-typecode saetp)
657 (list (sb!vm:saetp-typecode saetp)
658 (sb!vm:saetp-complex-typecode saetp))
659 (sb!vm:saetp-typecode saetp))
660 ',(sb!vm:saetp-specifier saetp)))
661 sb!vm:*specialized-array-element-type-properties*)
662 ((sb!vm:simple-array-widetag
663 sb!vm:complex-vector-widetag
664 sb!vm:complex-array-widetag)
665 (with-array-data ((array array) (start) (end))
666 (declare (ignore start end))
667 (array-element-type array)))
669 (error 'type-error :datum array :expected-type 'array))))))
671 (defun array-rank (array)
673 "Return the number of dimensions of ARRAY."
674 (if (array-header-p array)
678 (defun array-dimension (array axis-number)
680 "Return the length of dimension AXIS-NUMBER of ARRAY."
681 (declare (array array) (type index axis-number))
682 (cond ((not (array-header-p array))
683 (unless (= axis-number 0)
684 (error "Vector axis is not zero: ~S" axis-number))
685 (length (the (simple-array * (*)) array)))
686 ((>= axis-number (%array-rank array))
687 (error "Axis number ~W is too big; ~S only has ~D dimension~:P."
688 axis-number array (%array-rank array)))
690 ;; ANSI sayeth (ADJUST-ARRAY dictionary entry):
692 ;; "If A is displaced to B, the consequences are
693 ;; unspecified if B is adjusted in such a way that it no
694 ;; longer has enough elements to satisfy A.
696 ;; In situations where this matters we should be doing a
697 ;; bounds-check, which in turn uses ARRAY-DIMENSION -- so
698 ;; this seems like a good place to signal an error.
699 (multiple-value-bind (target offset) (array-displacement array)
701 (> (array-total-size array)
702 (- (array-total-size target) offset)))
703 (error 'displaced-to-array-too-small-error
704 :format-control "~@<The displaced-to array is too small. ~S ~
705 elements after offset required, ~S available.~:@>"
706 :format-arguments (list (array-total-size array)
707 (- (array-total-size target) offset))))
708 (%array-dimension array axis-number)))))
710 (defun array-dimensions (array)
712 "Return a list whose elements are the dimensions of the array"
713 (declare (array array))
714 (if (array-header-p array)
715 (do ((results nil (cons (array-dimension array index) results))
716 (index (1- (array-rank array)) (1- index)))
717 ((minusp index) results))
718 (list (array-dimension array 0))))
720 (defun array-total-size (array)
722 "Return the total number of elements in the Array."
723 (declare (array array))
724 (if (array-header-p array)
725 (%array-available-elements array)
726 (length (the vector array))))
728 (defun array-displacement (array)
730 "Return the values of :DISPLACED-TO and :DISPLACED-INDEX-offset
731 options to MAKE-ARRAY, or NIL and 0 if not a displaced array."
732 (declare (type array array))
733 (if (and (array-header-p array) ; if unsimple and
734 (%array-displaced-p array)) ; displaced
735 (values (%array-data-vector array) (%array-displacement array))
738 (defun adjustable-array-p (array)
740 "Return T if (ADJUST-ARRAY ARRAY...) would return an array identical
741 to the argument, this happens for complex arrays."
742 (declare (array array))
743 ;; Note that this appears not to be a fundamental limitation.
744 ;; non-vector SIMPLE-ARRAYs are in fact capable of being adjusted,
745 ;; but in practice we test using ADJUSTABLE-ARRAY-P in ADJUST-ARRAY.
746 ;; -- CSR, 2004-03-01.
747 (not (typep array 'simple-array)))
749 ;;;; fill pointer frobbing stuff
751 (defun array-has-fill-pointer-p (array)
753 "Return T if the given ARRAY has a fill pointer, or NIL otherwise."
754 (declare (array array))
755 (and (array-header-p array) (%array-fill-pointer-p array)))
757 (defun fill-pointer (vector)
759 "Return the FILL-POINTER of the given VECTOR."
760 (declare (vector vector))
761 (if (and (array-header-p vector) (%array-fill-pointer-p vector))
762 (%array-fill-pointer vector)
763 (error 'simple-type-error
765 :expected-type '(and vector (satisfies array-has-fill-pointer-p))
766 :format-control "~S is not an array with a fill pointer."
767 :format-arguments (list vector))))
769 (defun %set-fill-pointer (vector new)
770 (declare (vector vector) (fixnum new))
771 (if (and (array-header-p vector) (%array-fill-pointer-p vector))
772 (if (> new (%array-available-elements vector))
774 "The new fill pointer, ~S, is larger than the length of the vector."
776 (setf (%array-fill-pointer vector) new))
777 (error 'simple-type-error
779 :expected-type '(and vector (satisfies array-has-fill-pointer-p))
780 :format-control "~S is not an array with a fill pointer."
781 :format-arguments (list vector))))
783 ;;; FIXME: It'd probably make sense to use a MACROLET to share the
784 ;;; guts of VECTOR-PUSH between VECTOR-PUSH-EXTEND. Such a macro
785 ;;; should probably be based on the VECTOR-PUSH-EXTEND code (which is
786 ;;; new ca. sbcl-0.7.0) rather than the VECTOR-PUSH code (which dates
788 (defun vector-push (new-el array)
790 "Attempt to set the element of ARRAY designated by its fill pointer
791 to NEW-EL, and increment the fill pointer by one. If the fill pointer is
792 too large, NIL is returned, otherwise the index of the pushed element is
794 (declare (vector array))
795 (let ((fill-pointer (fill-pointer array)))
796 (declare (fixnum fill-pointer))
797 (cond ((= fill-pointer (%array-available-elements array))
800 (setf (aref array fill-pointer) new-el)
801 (setf (%array-fill-pointer array) (1+ fill-pointer))
804 (defun vector-push-extend (new-element
807 (extension (1+ (length vector))))
808 (declare (vector vector) (fixnum extension))
809 (let ((fill-pointer (fill-pointer vector)))
810 (declare (fixnum fill-pointer))
811 (when (= fill-pointer (%array-available-elements vector))
812 (adjust-array vector (+ fill-pointer extension)))
813 ;; disable bounds checking
814 (locally (declare (optimize (safety 0)))
815 (setf (aref vector fill-pointer) new-element))
816 (setf (%array-fill-pointer vector) (1+ fill-pointer))
819 (defun vector-pop (array)
821 "Decrease the fill pointer by 1 and return the element pointed to by the
823 (declare (vector array))
824 (let ((fill-pointer (fill-pointer array)))
825 (declare (fixnum fill-pointer))
826 (if (zerop fill-pointer)
827 (error "There is nothing left to pop.")
828 ;; disable bounds checking (and any fixnum test)
829 (locally (declare (optimize (safety 0)))
831 (setf (%array-fill-pointer array)
832 (1- fill-pointer)))))))
837 (defun adjust-array (array dimensions &key
838 (element-type (array-element-type array))
839 (initial-element nil initial-element-p)
840 (initial-contents nil initial-contents-p)
842 displaced-to displaced-index-offset)
844 "Adjust ARRAY's dimensions to the given DIMENSIONS and stuff."
845 (let ((dimensions (if (listp dimensions) dimensions (list dimensions))))
846 (cond ((/= (the fixnum (length (the list dimensions)))
847 (the fixnum (array-rank array)))
848 (error "The number of dimensions not equal to rank of array."))
849 ((not (subtypep element-type (array-element-type array)))
850 (error "The new element type, ~S, is incompatible with old type."
852 ((and fill-pointer (not (array-has-fill-pointer-p array)))
855 :expected-type '(satisfies array-has-fill-pointer-p))))
856 (let ((array-rank (length (the list dimensions))))
857 (declare (fixnum array-rank))
858 (unless (= array-rank 1)
860 (error "Only vectors can have fill pointers.")))
861 (cond (initial-contents-p
862 ;; array former contents replaced by INITIAL-CONTENTS
863 (if (or initial-element-p displaced-to)
864 (error "INITIAL-CONTENTS may not be specified with ~
865 the :INITIAL-ELEMENT or :DISPLACED-TO option."))
866 (let* ((array-size (apply #'* dimensions))
867 (array-data (data-vector-from-inits
868 dimensions array-size element-type
869 initial-contents initial-contents-p
870 initial-element initial-element-p)))
871 (if (adjustable-array-p array)
872 (set-array-header array array-data array-size
873 (get-new-fill-pointer array array-size
876 (if (array-header-p array)
877 ;; simple multidimensional or single dimensional array
878 (make-array dimensions
879 :element-type element-type
880 :initial-contents initial-contents)
883 ;; We already established that no INITIAL-CONTENTS was supplied.
884 (when initial-element
885 (error "The :INITIAL-ELEMENT option may not be specified ~
886 with :DISPLACED-TO."))
887 (unless (subtypep element-type (array-element-type displaced-to))
888 (error "can't displace an array of type ~S into another of ~
890 element-type (array-element-type displaced-to)))
891 (let ((displacement (or displaced-index-offset 0))
892 (array-size (apply #'* dimensions)))
893 (declare (fixnum displacement array-size))
894 (if (< (the fixnum (array-total-size displaced-to))
895 (the fixnum (+ displacement array-size)))
896 (error "The :DISPLACED-TO array is too small."))
897 (if (adjustable-array-p array)
898 ;; None of the original contents appear in adjusted array.
899 (set-array-header array displaced-to array-size
900 (get-new-fill-pointer array array-size
902 displacement dimensions t)
903 ;; simple multidimensional or single dimensional array
904 (make-array dimensions
905 :element-type element-type
906 :displaced-to displaced-to
907 :displaced-index-offset
908 displaced-index-offset))))
910 (let ((old-length (array-total-size array))
911 (new-length (car dimensions))
913 (declare (fixnum old-length new-length))
914 (with-array-data ((old-data array) (old-start)
915 (old-end old-length))
916 (cond ((or (and (array-header-p array)
917 (%array-displaced-p array))
918 (< old-length new-length))
920 (data-vector-from-inits
921 dimensions new-length element-type
922 initial-contents initial-contents-p
923 initial-element initial-element-p))
924 (replace new-data old-data
925 :start2 old-start :end2 old-end))
927 (shrink-vector old-data new-length))))
928 (if (adjustable-array-p array)
929 (set-array-header array new-data new-length
930 (get-new-fill-pointer array new-length
935 (let ((old-length (%array-available-elements array))
936 (new-length (apply #'* dimensions)))
937 (declare (fixnum old-length new-length))
938 (with-array-data ((old-data array) (old-start)
939 (old-end old-length))
940 (declare (ignore old-end))
941 (let ((new-data (if (or (and (array-header-p array)
942 (%array-displaced-p array))
943 (> new-length old-length))
944 (data-vector-from-inits
945 dimensions new-length
947 initial-element initial-element-p)
949 (if (or (zerop old-length) (zerop new-length))
950 (when initial-element-p (fill new-data initial-element))
951 (zap-array-data old-data (array-dimensions array)
953 new-data dimensions new-length
954 element-type initial-element
956 (if (adjustable-array-p array)
957 (set-array-header array new-data new-length
958 new-length 0 dimensions nil)
961 sb!vm:simple-array-widetag array-rank)))
962 (set-array-header new-array new-data new-length
963 new-length 0 dimensions nil)))))))))))
966 (defun get-new-fill-pointer (old-array new-array-size fill-pointer)
967 (cond ((not fill-pointer)
968 (when (array-has-fill-pointer-p old-array)
969 (when (> (%array-fill-pointer old-array) new-array-size)
970 (error "cannot ADJUST-ARRAY an array (~S) to a size (~S) that is ~
971 smaller than its fill pointer (~S)"
972 old-array new-array-size (fill-pointer old-array)))
973 (%array-fill-pointer old-array)))
974 ((not (array-has-fill-pointer-p old-array))
975 (error "cannot supply a non-NIL value (~S) for :FILL-POINTER ~
976 in ADJUST-ARRAY unless the array (~S) was originally ~
977 created with a fill pointer"
980 ((numberp fill-pointer)
981 (when (> fill-pointer new-array-size)
982 (error "can't supply a value for :FILL-POINTER (~S) that is larger ~
983 than the new length of the vector (~S)"
984 fill-pointer new-array-size))
989 (error "bogus value for :FILL-POINTER in ADJUST-ARRAY: ~S"
992 ;;; Destructively alter VECTOR, changing its length to NEW-LENGTH,
993 ;;; which must be less than or equal to its current length. This can
994 ;;; be called on vectors without a fill pointer but it is extremely
995 ;;; dangerous to do so: shrinking the size of an object (as viewed by
996 ;;; the gc) makes bounds checking unreliable in the face of interrupts
997 ;;; or multi-threading. Call it only on provably local vectors.
998 (defun %shrink-vector (vector new-length)
999 (declare (vector vector))
1000 (unless (array-header-p vector)
1001 (macrolet ((frob (name &rest things)
1003 ((simple-array nil (*)) (error 'nil-array-accessed-error))
1004 ,@(mapcar (lambda (thing)
1005 (destructuring-bind (type-spec fill-value)
1008 (fill (truly-the ,type-spec ,name)
1010 :start new-length))))
1012 ;; Set the 'tail' of the vector to the appropriate type of zero,
1013 ;; "because in some cases we'll scavenge larger areas in one go,
1014 ;; like groups of pages that had triggered the write barrier, or
1015 ;; the whole static space" according to jsnell.
1019 `((simple-array ,(sb!vm:saetp-specifier saetp) (*))
1020 ,(if (or (eq (sb!vm:saetp-specifier saetp) 'character)
1022 (eq (sb!vm:saetp-specifier saetp) 'base-char))
1023 *default-init-char-form*
1024 (sb!vm:saetp-initial-element-default saetp))))
1026 #'sb!vm:saetp-specifier
1027 sb!vm:*specialized-array-element-type-properties*)))))
1028 ;; Only arrays have fill-pointers, but vectors have their length
1029 ;; parameter in the same place.
1030 (setf (%array-fill-pointer vector) new-length)
1033 (defun shrink-vector (vector new-length)
1034 (declare (vector vector))
1036 ((eq (length vector) new-length)
1038 ((array-has-fill-pointer-p vector)
1039 (setf (%array-fill-pointer vector) new-length)
1041 (t (subseq vector 0 new-length))))
1043 ;;; Fill in array header with the provided information, and return the array.
1044 (defun set-array-header (array data length fill-pointer displacement dimensions
1045 &optional displacedp)
1046 (setf (%array-data-vector array) data)
1047 (setf (%array-available-elements array) length)
1049 (setf (%array-fill-pointer array) fill-pointer)
1050 (setf (%array-fill-pointer-p array) t))
1052 (setf (%array-fill-pointer array) length)
1053 (setf (%array-fill-pointer-p array) nil)))
1054 (setf (%array-displacement array) displacement)
1055 (if (listp dimensions)
1056 (dotimes (axis (array-rank array))
1057 (declare (type index axis))
1058 (setf (%array-dimension array axis) (pop dimensions)))
1059 (setf (%array-dimension array 0) dimensions))
1060 (setf (%array-displaced-p array) displacedp)
1063 ;;;; ZAP-ARRAY-DATA for ADJUST-ARRAY
1065 ;;; a temporary to be used when OLD-DATA and NEW-DATA are EQ.
1066 ;;; KLUDGE: Boy, DYNAMIC-EXTENT would be nice. This is rebound
1067 ;;; to length zero array in each new thread.
1069 ;;; DX is probably a bad idea, because a with a big array it would
1070 ;;; be fairly easy to blow the stack.
1071 (defvar *zap-array-data-temp* (vector))
1072 (declaim (simple-vector *zap-array-data-temp*))
1074 (defun zap-array-data-temp (length initial-element initial-element-p)
1075 (declare (fixnum length))
1076 (let ((tmp *zap-array-data-temp*))
1077 (declare (simple-vector tmp))
1078 (cond ((> length (length tmp))
1079 (setf *zap-array-data-temp*
1080 (if initial-element-p
1081 (make-array length :initial-element initial-element)
1082 (make-array length))))
1084 (fill tmp initial-element :end length))
1088 ;;; This does the grinding work for ADJUST-ARRAY. It zaps the data
1089 ;;; from the OLD-DATA in an arrangement specified by the OLD-DIMS to
1090 ;;; the NEW-DATA in an arrangement specified by the NEW-DIMS. OFFSET
1091 ;;; is a displaced offset to be added to computed indices of OLD-DATA.
1092 (defun zap-array-data (old-data old-dims offset new-data new-dims new-length
1093 element-type initial-element initial-element-p)
1094 (declare (list old-dims new-dims))
1095 ;; OLD-DIMS comes from array-dimensions, which returns a fresh list
1096 ;; at least in SBCL.
1097 ;; NEW-DIMS comes from the user.
1098 (setf old-dims (nreverse old-dims)
1099 new-dims (reverse new-dims))
1100 (cond ((eq old-data new-data)
1101 ;; NEW-LENGTH, ELEMENT-TYPE, INITIAL-ELEMENT, and
1102 ;; INITIAL-ELEMENT-P are used when OLD-DATA and NEW-DATA are
1103 ;; EQ; in this case, a temporary must be used and filled
1104 ;; appropriately. specified initial-element.
1105 (when initial-element-p
1106 ;; FIXME: transforming this TYPEP to someting a bit faster
1107 ;; would be a win...
1108 (unless (typep initial-element element-type)
1109 (error "~S can't be used to initialize an array of type ~S."
1110 initial-element element-type)))
1112 ;; Need to disable interrupts while using the temp-vector.
1113 ;; An interrupt handler that also happened to call
1114 ;; ADJUST-ARRAY could otherwise stomp on our data here.
1115 (let ((temp (zap-array-data-temp new-length
1116 initial-element initial-element-p)))
1117 (declare (simple-vector temp))
1118 (zap-array-data-aux old-data old-dims offset temp new-dims)
1119 (dotimes (i new-length)
1120 (setf (aref new-data i) (aref temp i)
1121 ;; zero out any garbage right away
1122 (aref temp i) 0)))))
1124 ;; When OLD-DATA and NEW-DATA are not EQ, NEW-DATA has
1125 ;; already been filled with any
1126 (zap-array-data-aux old-data old-dims offset new-data new-dims))))
1128 (defun zap-array-data-aux (old-data old-dims offset new-data new-dims)
1129 (declare (fixnum offset))
1130 (let ((limits (mapcar (lambda (x y)
1131 (declare (fixnum x y))
1132 (1- (the fixnum (min x y))))
1133 old-dims new-dims)))
1134 (macrolet ((bump-index-list (index limits)
1135 `(do ((subscripts ,index (cdr subscripts))
1136 (limits ,limits (cdr limits)))
1137 ((null subscripts) :eof)
1138 (cond ((< (the fixnum (car subscripts))
1139 (the fixnum (car limits)))
1141 (1+ (the fixnum (car subscripts))))
1143 (t (rplaca subscripts 0))))))
1144 (do ((index (make-list (length old-dims) :initial-element 0)
1145 (bump-index-list index limits)))
1147 (setf (aref new-data (row-major-index-from-dims index new-dims))
1149 (+ (the fixnum (row-major-index-from-dims index old-dims))
1152 ;;; Figure out the row-major-order index of an array reference from a
1153 ;;; list of subscripts and a list of dimensions. This is for internal
1154 ;;; calls only, and the subscripts and dim-list variables are assumed
1155 ;;; to be reversed from what the user supplied.
1156 (defun row-major-index-from-dims (rev-subscripts rev-dim-list)
1157 (do ((rev-subscripts rev-subscripts (cdr rev-subscripts))
1158 (rev-dim-list rev-dim-list (cdr rev-dim-list))
1161 ((null rev-dim-list) result)
1162 (declare (fixnum chunk-size result))
1163 (setq result (+ result
1164 (the fixnum (* (the fixnum (car rev-subscripts))
1166 (setq chunk-size (* chunk-size (the fixnum (car rev-dim-list))))))
1170 (defun bit-array-same-dimensions-p (array1 array2)
1171 (declare (type (array bit) array1 array2))
1172 (and (= (array-rank array1)
1173 (array-rank array2))
1174 (dotimes (index (array-rank array1) t)
1175 (when (/= (array-dimension array1 index)
1176 (array-dimension array2 index))
1179 (defun pick-result-array (result-bit-array bit-array-1)
1180 (case result-bit-array
1182 ((nil) (make-array (array-dimensions bit-array-1)
1184 :initial-element 0))
1186 (unless (bit-array-same-dimensions-p bit-array-1
1188 (error "~S and ~S don't have the same dimensions."
1189 bit-array-1 result-bit-array))
1192 (defmacro def-bit-array-op (name function)
1193 `(defun ,name (bit-array-1 bit-array-2 &optional result-bit-array)
1196 "Perform a bit-wise ~A on the elements of BIT-ARRAY-1 and ~
1197 BIT-ARRAY-2,~% putting the results in RESULT-BIT-ARRAY. ~
1198 If RESULT-BIT-ARRAY is T,~% BIT-ARRAY-1 is used. If ~
1199 RESULT-BIT-ARRAY is NIL or omitted, a new array is~% created. ~
1200 All the arrays must have the same rank and dimensions."
1201 (symbol-name function))
1202 (declare (type (array bit) bit-array-1 bit-array-2)
1203 (type (or (array bit) (member t nil)) result-bit-array))
1204 (unless (bit-array-same-dimensions-p bit-array-1 bit-array-2)
1205 (error "~S and ~S don't have the same dimensions."
1206 bit-array-1 bit-array-2))
1207 (let ((result-bit-array (pick-result-array result-bit-array bit-array-1)))
1208 (if (and (simple-bit-vector-p bit-array-1)
1209 (simple-bit-vector-p bit-array-2)
1210 (simple-bit-vector-p result-bit-array))
1211 (locally (declare (optimize (speed 3) (safety 0)))
1212 (,name bit-array-1 bit-array-2 result-bit-array))
1213 (with-array-data ((data1 bit-array-1) (start1) (end1))
1214 (declare (ignore end1))
1215 (with-array-data ((data2 bit-array-2) (start2) (end2))
1216 (declare (ignore end2))
1217 (with-array-data ((data3 result-bit-array) (start3) (end3))
1218 (do ((index-1 start1 (1+ index-1))
1219 (index-2 start2 (1+ index-2))
1220 (index-3 start3 (1+ index-3)))
1221 ((>= index-3 end3) result-bit-array)
1222 (declare (type index index-1 index-2 index-3))
1223 (setf (sbit data3 index-3)
1224 (logand (,function (sbit data1 index-1)
1225 (sbit data2 index-2))
1228 (def-bit-array-op bit-and logand)
1229 (def-bit-array-op bit-ior logior)
1230 (def-bit-array-op bit-xor logxor)
1231 (def-bit-array-op bit-eqv logeqv)
1232 (def-bit-array-op bit-nand lognand)
1233 (def-bit-array-op bit-nor lognor)
1234 (def-bit-array-op bit-andc1 logandc1)
1235 (def-bit-array-op bit-andc2 logandc2)
1236 (def-bit-array-op bit-orc1 logorc1)
1237 (def-bit-array-op bit-orc2 logorc2)
1239 (defun bit-not (bit-array &optional result-bit-array)
1241 "Performs a bit-wise logical NOT on the elements of BIT-ARRAY,
1242 putting the results in RESULT-BIT-ARRAY. If RESULT-BIT-ARRAY is T,
1243 BIT-ARRAY is used. If RESULT-BIT-ARRAY is NIL or omitted, a new array is
1244 created. Both arrays must have the same rank and dimensions."
1245 (declare (type (array bit) bit-array)
1246 (type (or (array bit) (member t nil)) result-bit-array))
1247 (let ((result-bit-array (pick-result-array result-bit-array bit-array)))
1248 (if (and (simple-bit-vector-p bit-array)
1249 (simple-bit-vector-p result-bit-array))
1250 (locally (declare (optimize (speed 3) (safety 0)))
1251 (bit-not bit-array result-bit-array))
1252 (with-array-data ((src bit-array) (src-start) (src-end))
1253 (declare (ignore src-end))
1254 (with-array-data ((dst result-bit-array) (dst-start) (dst-end))
1255 (do ((src-index src-start (1+ src-index))
1256 (dst-index dst-start (1+ dst-index)))
1257 ((>= dst-index dst-end) result-bit-array)
1258 (declare (type index src-index dst-index))
1259 (setf (sbit dst dst-index)
1260 (logxor (sbit src src-index) 1))))))))