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 (%with-array-data array index nil)
55 (values array index)))
57 ;;; It'd waste space to expand copies of error handling in every
58 ;;; inline %WITH-ARRAY-DATA, so we have them call this function
59 ;;; instead. This is just a wrapper which is known never to return.
60 (defun failed-%with-array-data (array start end)
61 (declare (notinline %with-array-data))
62 (%with-array-data array start end)
63 (bug "called FAILED-%WITH-ARRAY-DATA with valid array parameters?"))
66 (defun upgraded-array-element-type (spec &optional environment)
68 "Return the element type that will actually be used to implement an array
69 with the specifier :ELEMENT-TYPE Spec."
70 (declare (ignore environment))
71 (if (unknown-type-p (specifier-type spec))
72 (error "undefined type: ~S" spec)
73 (type-specifier (array-type-specialized-element-type
74 (specifier-type `(array ,spec))))))
75 (eval-when (:compile-toplevel :execute)
76 (sb!xc:defmacro pick-vector-type (type &rest specs)
77 `(cond ,@(mapcar (lambda (spec)
78 `(,(if (eq (car spec) t)
80 `(subtypep ,type ',(car spec)))
84 ;;; These functions are used in the implementation of MAKE-ARRAY for
85 ;;; complex arrays. There are lots of transforms to simplify
86 ;;; MAKE-ARRAY for various easy cases, but not for all reasonable
87 ;;; cases, so e.g. as of sbcl-0.6.6 we still make full calls to
88 ;;; MAKE-ARRAY for any non-simple array. Thus, there's some value to
89 ;;; making this somewhat efficient, at least not doing full calls to
90 ;;; SUBTYPEP in the easy cases.
91 (defun %vector-widetag-and-n-bits (type)
93 ;; Pick off some easy common cases.
95 ;; (Perhaps we should make a much more exhaustive table of easy
96 ;; common cases here. Or perhaps the effort would be better spent
97 ;; on smarter compiler transforms which do the calculation once
98 ;; and for all in any reasonable user programs.)
100 (values #.sb!vm:simple-vector-widetag #.sb!vm:n-word-bits))
101 ((character base-char standard-char)
102 (values #.sb!vm:simple-string-widetag #.sb!vm:n-byte-bits))
104 (values #.sb!vm:simple-bit-vector-widetag 1))
105 ;; OK, we have to wade into SUBTYPEPing after all.
107 ;; FIXME: The data here are redundant with
108 ;; *SPECIALIZED-ARRAY-ELEMENT-TYPE-PROPERTIES*.
109 (pick-vector-type type
110 (base-char (values #.sb!vm:simple-string-widetag #.sb!vm:n-byte-bits))
111 (bit (values #.sb!vm:simple-bit-vector-widetag 1))
113 (values #.sb!vm:simple-array-unsigned-byte-2-widetag 2))
115 (values #.sb!vm:simple-array-unsigned-byte-4-widetag 4))
117 (values #.sb!vm:simple-array-unsigned-byte-8-widetag 8))
119 (values #.sb!vm:simple-array-unsigned-byte-16-widetag 16))
121 (values #.sb!vm:simple-array-unsigned-byte-32-widetag 32))
123 (values #.sb!vm:simple-array-signed-byte-8-widetag 8))
125 (values #.sb!vm:simple-array-signed-byte-16-widetag 16))
127 (values #.sb!vm:simple-array-signed-byte-30-widetag 32))
129 (values #.sb!vm:simple-array-signed-byte-32-widetag 32))
130 (single-float (values #.sb!vm:simple-array-single-float-widetag 32))
131 (double-float (values #.sb!vm:simple-array-double-float-widetag 64))
134 (values #.sb!vm:simple-array-long-float-widetag
135 #!+x86 96 #!+sparc 128))
136 ((complex single-float)
137 (values #.sb!vm:simple-array-complex-single-float-widetag 64))
138 ((complex double-float)
139 (values #.sb!vm:simple-array-complex-double-float-widetag 128))
141 ((complex long-float)
142 (values #.sb!vm:simple-array-complex-long-float-widetag
145 (t (values #.sb!vm:simple-vector-widetag #.sb!vm:n-word-bits))))))
146 (defun %complex-vector-widetag (type)
148 ;; Pick off some easy common cases.
150 #.sb!vm:complex-vector-widetag)
151 ((character base-char)
152 #.sb!vm:complex-string-widetag)
154 #.sb!vm:complex-bit-vector-widetag)
155 ;; OK, we have to wade into SUBTYPEPing after all.
157 (pick-vector-type type
158 (base-char #.sb!vm:complex-string-widetag)
159 (bit #.sb!vm:complex-bit-vector-widetag)
160 (t #.sb!vm:complex-vector-widetag)))))
162 (defun make-array (dimensions &key
164 (initial-element nil initial-element-p)
165 initial-contents adjustable fill-pointer
166 displaced-to displaced-index-offset)
167 (let* ((dimensions (if (listp dimensions) dimensions (list dimensions)))
168 (array-rank (length (the list dimensions)))
169 (simple (and (null fill-pointer)
171 (null displaced-to))))
172 (declare (fixnum array-rank))
173 (when (and displaced-index-offset (null displaced-to))
174 (error "can't specify :DISPLACED-INDEX-OFFSET without :DISPLACED-TO"))
175 (if (and simple (= array-rank 1))
176 ;; Its a (simple-array * (*))
177 (multiple-value-bind (type n-bits)
178 (%vector-widetag-and-n-bits element-type)
179 (declare (type (unsigned-byte 8) type)
180 (type (integer 1 256) n-bits))
181 (let* ((length (car dimensions))
182 (array (allocate-vector
185 (ceiling (* (if (= type sb!vm:simple-string-widetag)
189 sb!vm:n-word-bits))))
190 (declare (type index length))
191 (when initial-element-p
192 (fill array initial-element))
193 (when initial-contents
194 (when initial-element
195 (error "can't specify both :INITIAL-ELEMENT and ~
197 (unless (= length (length initial-contents))
198 (error "There are ~W elements in the :INITIAL-CONTENTS, but ~
199 the vector length is ~W."
200 (length initial-contents)
202 (replace array initial-contents))
204 ;; It's either a complex array or a multidimensional array.
205 (let* ((total-size (reduce #'* dimensions))
206 (data (or displaced-to
207 (data-vector-from-inits
208 dimensions total-size element-type
209 initial-contents initial-element initial-element-p)))
210 (array (make-array-header
211 (cond ((= array-rank 1)
212 (%complex-vector-widetag element-type))
213 (simple sb!vm:simple-array-widetag)
214 (t sb!vm:complex-array-widetag))
217 (unless (= array-rank 1)
218 (error "Only vectors can have fill pointers."))
219 (let ((length (car dimensions)))
220 (declare (fixnum length))
221 (setf (%array-fill-pointer array)
222 (cond ((eq fill-pointer t)
225 (unless (and (fixnump fill-pointer)
227 (<= fill-pointer length))
228 ;; FIXME: should be TYPE-ERROR?
229 (error "invalid fill-pointer ~W"
232 (setf (%array-fill-pointer-p array) t))
234 (setf (%array-fill-pointer array) total-size)
235 (setf (%array-fill-pointer-p array) nil)))
236 (setf (%array-available-elements array) total-size)
237 (setf (%array-data-vector array) data)
239 (when (or initial-element-p initial-contents)
240 (error "Neither :INITIAL-ELEMENT nor :INITIAL-CONTENTS ~
241 can be specified along with :DISPLACED-TO"))
242 (let ((offset (or displaced-index-offset 0)))
243 (when (> (+ offset total-size)
244 (array-total-size displaced-to))
245 (error "~S doesn't have enough elements." displaced-to))
246 (setf (%array-displacement array) offset)
247 (setf (%array-displaced-p array) t)))
249 (setf (%array-displaced-p array) nil)))
251 (dolist (dim dimensions)
252 (setf (%array-dimension array axis) dim)
256 ;;; DATA-VECTOR-FROM-INITS returns a simple vector that has the
257 ;;; specified array characteristics. Dimensions is only used to pass
258 ;;; to FILL-DATA-VECTOR for error checking on the structure of
259 ;;; initial-contents.
260 (defun data-vector-from-inits (dimensions total-size element-type
261 initial-contents initial-element
263 (when (and initial-contents initial-element-p)
264 (error "cannot supply both :INITIAL-CONTENTS and :INITIAL-ELEMENT to
265 either MAKE-ARRAY or ADJUST-ARRAY."))
266 (let ((data (if initial-element-p
267 (make-array total-size
268 :element-type element-type
269 :initial-element initial-element)
270 (make-array total-size
271 :element-type element-type))))
272 (cond (initial-element-p
273 (unless (simple-vector-p data)
274 (unless (typep initial-element element-type)
275 (error "~S cannot be used to initialize an array of type ~S."
276 initial-element element-type))
277 (fill (the vector data) initial-element)))
279 (fill-data-vector data dimensions initial-contents)))
282 (defun fill-data-vector (vector dimensions initial-contents)
284 (labels ((frob (axis dims contents)
286 (setf (aref vector index) contents)
289 (unless (typep contents 'sequence)
290 (error "malformed :INITIAL-CONTENTS: ~S is not a ~
291 sequence, but ~W more layer~:P needed."
293 (- (length dimensions) axis)))
294 (unless (= (length contents) (car dims))
295 (error "malformed :INITIAL-CONTENTS: Dimension of ~
296 axis ~W is ~W, but ~S is ~W long."
297 axis (car dims) contents (length contents)))
299 (dolist (content contents)
300 (frob (1+ axis) (cdr dims) content))
301 (dotimes (i (length contents))
302 (frob (1+ axis) (cdr dims) (aref contents i))))))))
303 (frob 0 dimensions initial-contents))))
305 (defun vector (&rest objects)
307 "Construct a SIMPLE-VECTOR from the given objects."
308 (coerce (the list objects) 'simple-vector))
310 ;;;; accessor/setter functions
312 (eval-when (:compile-toplevel :execute)
313 (defparameter *specialized-array-element-types*
328 #!+long-float long-float
329 (complex single-float)
330 (complex double-float)
331 #!+long-float (complex long-float))))
333 (defun hairy-data-vector-ref (array index)
334 (with-array-data ((vector array) (index index) (end))
335 (declare (ignore end))
337 #.(mapcar (lambda (type)
338 (let ((atype `(simple-array ,type (*))))
340 (data-vector-ref (the ,atype vector)
342 *specialized-array-element-types*))))
344 ;;; (Ordinary DATA-VECTOR-REF usage compiles into a vop, but
345 ;;; DATA-VECTOR-REF is also FOLDABLE, and this ordinary function
346 ;;; definition is needed for the compiler to use in constant folding.)
347 (defun data-vector-ref (array index)
348 (hairy-data-vector-ref array index))
350 (defun hairy-data-vector-set (array index new-value)
351 (with-array-data ((vector array) (index index) (end))
352 (declare (ignore end))
354 #.(mapcar (lambda (type)
355 (let ((atype `(simple-array ,type (*))))
357 (data-vector-set (the ,atype vector)
361 ;; For specialized arrays, the return
362 ;; from data-vector-set would have to
363 ;; be reboxed to be a (Lisp) return
364 ;; value; instead, we use the
365 ;; already-boxed value as the return.
367 *specialized-array-element-types*))))
369 (defun %array-row-major-index (array subscripts
370 &optional (invalid-index-error-p t))
371 (declare (array array)
373 (let ((rank (array-rank array)))
374 (unless (= rank (length subscripts))
375 (error "wrong number of subscripts, ~W, for array of rank ~W"
376 (length subscripts) rank))
377 (if (array-header-p array)
378 (do ((subs (nreverse subscripts) (cdr subs))
379 (axis (1- (array-rank array)) (1- axis))
383 (declare (list subs) (fixnum axis chunk-size result))
384 (let ((index (car subs))
385 (dim (%array-dimension array axis)))
386 (declare (fixnum dim))
387 (unless (< -1 index dim)
388 (if invalid-index-error-p
389 (error 'simple-type-error
390 :format-control "invalid index ~W~[~;~:; on axis ~:*~W~] in ~S"
391 :format-arguments (list index axis array)
393 :expected-type `(integer 0 (,dim)))
394 (return-from %array-row-major-index nil)))
395 (incf result (* chunk-size (the fixnum index)))
396 (setf chunk-size (* chunk-size dim))))
397 (let ((index (first subscripts))
398 (length (length (the (simple-array * (*)) array))))
399 (unless (< -1 index length)
400 (if invalid-index-error-p
401 ;; FIXME: perhaps this should share a format-string
402 ;; with INVALID-ARRAY-INDEX-ERROR or
403 ;; INDEX-TOO-LARGE-ERROR?
404 (error 'simple-type-error
405 :format-control "invalid index ~W in ~S"
406 :format-arguments (list index array)
408 :expected-type `(integer 0 (,length)))
409 (return-from %array-row-major-index nil)))
412 (defun array-in-bounds-p (array &rest subscripts)
414 "Return T if the Subscipts are in bounds for the Array, Nil otherwise."
415 (if (%array-row-major-index array subscripts nil)
418 (defun array-row-major-index (array &rest subscripts)
419 (%array-row-major-index array subscripts))
421 (defun aref (array &rest subscripts)
423 "Return the element of the Array specified by the Subscripts."
424 (row-major-aref array (%array-row-major-index array subscripts)))
426 (defun %aset (array &rest stuff)
427 (let ((subscripts (butlast stuff))
428 (new-value (car (last stuff))))
429 (setf (row-major-aref array (%array-row-major-index array subscripts))
432 ;;; FIXME: What's supposed to happen with functions
433 ;;; like AREF when we (DEFUN (SETF FOO) ..) when
434 ;;; DEFSETF FOO is also defined? It seems as though the logical
435 ;;; thing to do would be to nuke the macro definition for (SETF FOO)
436 ;;; and replace it with the (SETF FOO) function, issuing a warning,
437 ;;; just as for ordinary functions
438 ;;; * (LISP-IMPLEMENTATION-VERSION)
439 ;;; "18a+ release x86-linux 2.4.7 6 November 1998 cvs"
440 ;;; * (DEFMACRO ZOO (X) `(+ ,X ,X))
442 ;;; * (DEFUN ZOO (X) (* 3 X))
443 ;;; Warning: ZOO previously defined as a macro.
445 ;;; But that doesn't seem to be what happens in CMU CL.
447 ;;; KLUDGE: this is probably because ANSI, in its wisdom (CLHS
448 ;;; 5.1.2.5) requires implementations to support
449 ;;; (SETF (APPLY #'AREF ...) ...)
450 ;;; [and also #'BIT and #'SBIT]. Yes, this is terrifying, and it's
451 ;;; also terrifying that this sequence of definitions causes it to
454 ;;; Also, it would be nice to make DESCRIBE FOO tell whether a symbol
455 ;;; has a setf expansion and/or a setf function defined.
457 #!-sb-fluid (declaim (inline (setf aref)))
458 (defun (setf aref) (new-value array &rest subscripts)
459 (declare (type array array))
460 (setf (row-major-aref array (%array-row-major-index array subscripts))
463 (defun row-major-aref (array index)
465 "Return the element of array corressponding to the row-major index. This is
467 (declare (optimize (safety 1)))
468 (row-major-aref array index))
470 (defun %set-row-major-aref (array index new-value)
471 (declare (optimize (safety 1)))
472 (setf (row-major-aref array index) new-value))
474 (defun svref (simple-vector index)
476 "Return the INDEX'th element of the given Simple-Vector."
477 (declare (optimize (safety 1)))
478 (aref simple-vector index))
480 (defun %svset (simple-vector index new)
481 (declare (optimize (safety 1)))
482 (setf (aref simple-vector index) new))
484 (defun bit (bit-array &rest subscripts)
486 "Return the bit from the BIT-ARRAY at the specified SUBSCRIPTS."
487 (declare (type (array bit) bit-array) (optimize (safety 1)))
488 (row-major-aref bit-array (%array-row-major-index bit-array subscripts)))
490 (defun %bitset (bit-array &rest stuff)
491 (declare (type (array bit) bit-array) (optimize (safety 1)))
492 (let ((subscripts (butlast stuff))
493 (new-value (car (last stuff))))
494 (setf (row-major-aref bit-array
495 (%array-row-major-index bit-array subscripts))
498 #!-sb-fluid (declaim (inline (setf bit)))
499 (defun (setf bit) (new-value bit-array &rest subscripts)
500 (declare (type (array bit) bit-array) (optimize (safety 1)))
501 (setf (row-major-aref bit-array
502 (%array-row-major-index bit-array subscripts))
505 (defun sbit (simple-bit-array &rest subscripts)
507 "Return the bit from SIMPLE-BIT-ARRAY at the specified SUBSCRIPTS."
508 (declare (type (simple-array bit) simple-bit-array) (optimize (safety 1)))
509 (row-major-aref simple-bit-array
510 (%array-row-major-index simple-bit-array subscripts)))
512 ;;; KLUDGE: Not all these things (%SET-ROW-MAJOR-AREF, %SET-FILL-POINTER,
513 ;;; %SET-FDEFINITION, %SCHARSET, %SBITSET..) seem to deserve separate names.
514 ;;; Could we just DEFUN (SETF SBIT) etc. and get rid of the non-ANSI names?
516 (defun %sbitset (simple-bit-array &rest stuff)
517 (declare (type (simple-array bit) simple-bit-array) (optimize (safety 1)))
518 (let ((subscripts (butlast stuff))
519 (new-value (car (last stuff))))
520 (setf (row-major-aref simple-bit-array
521 (%array-row-major-index simple-bit-array subscripts))
524 #!-sb-fluid (declaim (inline (setf sbit)))
525 (defun (setf sbit) (new-value bit-array &rest subscripts)
526 (declare (type (simple-array bit) bit-array) (optimize (safety 1)))
527 (setf (row-major-aref bit-array
528 (%array-row-major-index bit-array subscripts))
531 ;;;; miscellaneous array properties
533 (defun array-element-type (array)
535 "Return the type of the elements of the array"
536 (let ((widetag (widetag-of array)))
537 (macrolet ((pick-element-type (&rest stuff)
538 `(cond ,@(mapcar (lambda (stuff)
540 (let ((item (car stuff)))
549 `(= widetag ,item))))
552 ;; FIXME: The data here are redundant with
553 ;; *SPECIALIZED-ARRAY-ELEMENT-TYPE-PROPERTIES*.
555 ((sb!vm:simple-string-widetag sb!vm:complex-string-widetag) 'base-char)
556 ((sb!vm:simple-bit-vector-widetag
557 sb!vm:complex-bit-vector-widetag) 'bit)
558 (sb!vm:simple-vector-widetag t)
559 (sb!vm:simple-array-unsigned-byte-2-widetag '(unsigned-byte 2))
560 (sb!vm:simple-array-unsigned-byte-4-widetag '(unsigned-byte 4))
561 (sb!vm:simple-array-unsigned-byte-8-widetag '(unsigned-byte 8))
562 (sb!vm:simple-array-unsigned-byte-16-widetag '(unsigned-byte 16))
563 (sb!vm:simple-array-unsigned-byte-32-widetag '(unsigned-byte 32))
564 (sb!vm:simple-array-signed-byte-8-widetag '(signed-byte 8))
565 (sb!vm:simple-array-signed-byte-16-widetag '(signed-byte 16))
566 (sb!vm:simple-array-signed-byte-30-widetag '(signed-byte 30))
567 (sb!vm:simple-array-signed-byte-32-widetag '(signed-byte 32))
568 (sb!vm:simple-array-single-float-widetag 'single-float)
569 (sb!vm:simple-array-double-float-widetag 'double-float)
571 (sb!vm:simple-array-long-float-widetag 'long-float)
572 (sb!vm:simple-array-complex-single-float-widetag
573 '(complex single-float))
574 (sb!vm:simple-array-complex-double-float-widetag
575 '(complex double-float))
577 (sb!vm:simple-array-complex-long-float-widetag '(complex long-float))
578 ((sb!vm:simple-array-widetag
579 sb!vm:complex-vector-widetag
580 sb!vm:complex-array-widetag)
581 (with-array-data ((array array) (start) (end))
582 (declare (ignore start end))
583 (array-element-type array)))
585 (error 'type-error :datum array :expected-type 'array))))))
587 (defun array-rank (array)
589 "Return the number of dimensions of ARRAY."
590 (if (array-header-p array)
594 (defun array-dimension (array axis-number)
596 "Return the length of dimension AXIS-NUMBER of ARRAY."
597 (declare (array array) (type index axis-number))
598 (cond ((not (array-header-p array))
599 (unless (= axis-number 0)
600 (error "Vector axis is not zero: ~S" axis-number))
601 (length (the (simple-array * (*)) array)))
602 ((>= axis-number (%array-rank array))
603 (error "Axis number ~W is too big; ~S only has ~D dimension~:P."
604 axis-number array (%array-rank array)))
606 (%array-dimension array axis-number))))
608 (defun array-dimensions (array)
610 "Return a list whose elements are the dimensions of the array"
611 (declare (array array))
612 (if (array-header-p array)
613 (do ((results nil (cons (array-dimension array index) results))
614 (index (1- (array-rank array)) (1- index)))
615 ((minusp index) results))
616 (list (array-dimension array 0))))
618 (defun array-total-size (array)
620 "Return the total number of elements in the Array."
621 (declare (array array))
622 (if (array-header-p array)
623 (%array-available-elements array)
624 (length (the vector array))))
626 (defun array-displacement (array)
628 "Return the values of :DISPLACED-TO and :DISPLACED-INDEX-offset
629 options to MAKE-ARRAY, or NIL and 0 if not a displaced array."
630 (declare (type array array))
631 (if (and (array-header-p array) ; if unsimple and
632 (%array-displaced-p array)) ; displaced
633 (values (%array-data-vector array) (%array-displacement array))
636 (defun adjustable-array-p (array)
638 "Return T if (ADJUST-ARRAY ARRAY...) would return an array identical
639 to the argument, this happens for complex arrays."
640 (declare (array array))
641 (not (typep array 'simple-array)))
643 ;;;; fill pointer frobbing stuff
645 (defun array-has-fill-pointer-p (array)
647 "Return T if the given ARRAY has a fill pointer, or NIL otherwise."
648 (declare (array array))
649 (and (array-header-p array) (%array-fill-pointer-p array)))
651 (defun fill-pointer (vector)
653 "Return the FILL-POINTER of the given VECTOR."
654 (declare (vector vector))
655 (if (and (array-header-p vector) (%array-fill-pointer-p vector))
656 (%array-fill-pointer vector)
657 (error 'simple-type-error
659 :expected-type '(and vector (satisfies array-has-fill-pointer-p))
660 :format-control "~S is not an array with a fill pointer."
661 :format-arguments (list vector))))
663 (defun %set-fill-pointer (vector new)
664 (declare (vector vector) (fixnum new))
665 (if (and (array-header-p vector) (%array-fill-pointer-p vector))
666 (if (> new (%array-available-elements vector))
668 "The new fill pointer, ~S, is larger than the length of the vector."
670 (setf (%array-fill-pointer vector) new))
671 (error 'simple-type-error
673 :expected-type '(and vector (satisfies array-has-fill-pointer-p))
674 :format-control "~S is not an array with a fill pointer."
675 :format-arguments (list vector))))
677 ;;; FIXME: It'd probably make sense to use a MACROLET to share the
678 ;;; guts of VECTOR-PUSH between VECTOR-PUSH-EXTEND. Such a macro
679 ;;; should probably be based on the VECTOR-PUSH-EXTEND code (which is
680 ;;; new ca. sbcl-0.7.0) rather than the VECTOR-PUSH code (which dates
682 (defun vector-push (new-el array)
684 "Attempt to set the element of ARRAY designated by its fill pointer
685 to NEW-EL, and increment the fill pointer by one. If the fill pointer is
686 too large, NIL is returned, otherwise the index of the pushed element is
688 (declare (vector array))
689 (let ((fill-pointer (fill-pointer array)))
690 (declare (fixnum fill-pointer))
691 (cond ((= fill-pointer (%array-available-elements array))
694 (setf (aref array fill-pointer) new-el)
695 (setf (%array-fill-pointer array) (1+ fill-pointer))
698 (defun vector-push-extend (new-element
701 (extension (1+ (length vector))))
702 (declare (vector vector) (fixnum extension))
703 (let ((fill-pointer (fill-pointer vector)))
704 (declare (fixnum fill-pointer))
705 (when (= fill-pointer (%array-available-elements vector))
706 (adjust-array vector (+ fill-pointer extension)))
707 (setf (aref vector fill-pointer) new-element)
708 (setf (%array-fill-pointer vector) (1+ fill-pointer))
711 (defun vector-pop (array)
713 "Decrease the fill pointer by 1 and return the element pointed to by the
715 (declare (vector array))
716 (let ((fill-pointer (fill-pointer array)))
717 (declare (fixnum fill-pointer))
718 (if (zerop fill-pointer)
719 (error "There is nothing left to pop.")
721 (setf (%array-fill-pointer array)
722 (1- fill-pointer))))))
726 (defun adjust-array (array dimensions &key
727 (element-type (array-element-type array))
728 (initial-element nil initial-element-p)
729 initial-contents fill-pointer
730 displaced-to displaced-index-offset)
732 "Adjust ARRAY's dimensions to the given DIMENSIONS and stuff."
733 (let ((dimensions (if (listp dimensions) dimensions (list dimensions))))
734 (cond ((/= (the fixnum (length (the list dimensions)))
735 (the fixnum (array-rank array)))
736 (error "The number of dimensions not equal to rank of array."))
737 ((not (subtypep element-type (array-element-type array)))
738 (error "The new element type, ~S, is incompatible with old type."
740 (let ((array-rank (length (the list dimensions))))
741 (declare (fixnum array-rank))
742 (when (and fill-pointer (> array-rank 1))
743 (error "Multidimensional arrays can't have fill pointers."))
744 (cond (initial-contents
745 ;; array former contents replaced by INITIAL-CONTENTS
746 (if (or initial-element-p displaced-to)
747 (error "INITIAL-CONTENTS may not be specified with ~
748 the :INITIAL-ELEMENT or :DISPLACED-TO option."))
749 (let* ((array-size (apply #'* dimensions))
750 (array-data (data-vector-from-inits
751 dimensions array-size element-type
752 initial-contents initial-element
754 (if (adjustable-array-p array)
755 (set-array-header array array-data array-size
756 (get-new-fill-pointer array array-size
759 (if (array-header-p array)
760 ;; simple multidimensional or single dimensional array
761 (make-array dimensions
762 :element-type element-type
763 :initial-contents initial-contents)
766 ;; We already established that no INITIAL-CONTENTS was supplied.
767 (when initial-element
768 (error "The :INITIAL-ELEMENT option may not be specified ~
769 with :DISPLACED-TO."))
770 (unless (subtypep element-type (array-element-type displaced-to))
771 (error "can't displace an array of type ~S into another of ~
773 element-type (array-element-type displaced-to)))
774 (let ((displacement (or displaced-index-offset 0))
775 (array-size (apply #'* dimensions)))
776 (declare (fixnum displacement array-size))
777 (if (< (the fixnum (array-total-size displaced-to))
778 (the fixnum (+ displacement array-size)))
779 (error "The :DISPLACED-TO array is too small."))
780 (if (adjustable-array-p array)
781 ;; None of the original contents appear in adjusted array.
782 (set-array-header array displaced-to array-size
783 (get-new-fill-pointer array array-size
785 displacement dimensions t)
786 ;; simple multidimensional or single dimensional array
787 (make-array dimensions
788 :element-type element-type
789 :displaced-to displaced-to
790 :displaced-index-offset
791 displaced-index-offset))))
793 (let ((old-length (array-total-size array))
794 (new-length (car dimensions))
796 (declare (fixnum old-length new-length))
797 (with-array-data ((old-data array) (old-start)
798 (old-end old-length))
799 (cond ((or (%array-displaced-p array)
800 (< old-length new-length))
802 (data-vector-from-inits
803 dimensions new-length element-type
804 initial-contents initial-element
806 (replace new-data old-data
807 :start2 old-start :end2 old-end))
809 (shrink-vector old-data new-length))))
810 (if (adjustable-array-p array)
811 (set-array-header array new-data new-length
812 (get-new-fill-pointer array new-length
817 (let ((old-length (%array-available-elements array))
818 (new-length (apply #'* dimensions)))
819 (declare (fixnum old-length new-length))
820 (with-array-data ((old-data array) (old-start)
821 (old-end old-length))
822 (declare (ignore old-end))
823 (let ((new-data (if (or (%array-displaced-p array)
824 (> new-length old-length))
825 (data-vector-from-inits
826 dimensions new-length
827 element-type () initial-element
830 (if (or (zerop old-length) (zerop new-length))
831 (when initial-element-p (fill new-data initial-element))
832 (zap-array-data old-data (array-dimensions array)
834 new-data dimensions new-length
835 element-type initial-element
837 (set-array-header array new-data new-length
838 new-length 0 dimensions nil)))))))))
840 (defun get-new-fill-pointer (old-array new-array-size fill-pointer)
841 (cond ((not fill-pointer)
842 (when (array-has-fill-pointer-p old-array)
843 (when (> (%array-fill-pointer old-array) new-array-size)
844 (error "cannot ADJUST-ARRAY an array (~S) to a size (~S) that is ~
845 smaller than its fill pointer (~S)"
846 old-array new-array-size (fill-pointer old-array)))
847 (%array-fill-pointer old-array)))
848 ((not (array-has-fill-pointer-p old-array))
849 (error "cannot supply a non-NIL value (~S) for :FILL-POINTER ~
850 in ADJUST-ARRAY unless the array (~S) was originally ~
851 created with a fill pointer"
854 ((numberp fill-pointer)
855 (when (> fill-pointer new-array-size)
856 (error "can't supply a value for :FILL-POINTER (~S) that is larger ~
857 than the new length of the vector (~S)"
858 fill-pointer new-array-size))
863 (error "bogus value for :FILL-POINTER in ADJUST-ARRAY: ~S"
866 ;;; Destructively alter VECTOR, changing its length to NEW-LENGTH,
867 ;;; which must be less than or equal to its current length.
868 (defun shrink-vector (vector new-length)
869 (declare (vector vector))
870 (unless (array-header-p vector)
871 (macrolet ((frob (name &rest things)
873 ,@(mapcar (lambda (thing)
874 (destructuring-bind (type-spec fill-value)
877 (fill (truly-the ,type-spec ,name)
879 :start new-length))))
881 ;; FIXME: The associations between vector types and initial
882 ;; values here are redundant with
883 ;; *SPECIALIZED-ARRAY-ELEMENT-TYPE-PROPERTIES*.
886 (simple-base-string #.*default-init-char-form*)
887 (simple-bit-vector 0)
888 ((simple-array (unsigned-byte 2) (*)) 0)
889 ((simple-array (unsigned-byte 4) (*)) 0)
890 ((simple-array (unsigned-byte 8) (*)) 0)
891 ((simple-array (unsigned-byte 16) (*)) 0)
892 ((simple-array (unsigned-byte 32) (*)) 0)
893 ((simple-array (signed-byte 8) (*)) 0)
894 ((simple-array (signed-byte 16) (*)) 0)
895 ((simple-array (signed-byte 30) (*)) 0)
896 ((simple-array (signed-byte 32) (*)) 0)
897 ((simple-array single-float (*)) (coerce 0 'single-float))
898 ((simple-array double-float (*)) (coerce 0 'double-float))
900 ((simple-array long-float (*)) (coerce 0 'long-float))
901 ((simple-array (complex single-float) (*))
902 (coerce 0 '(complex single-float)))
903 ((simple-array (complex double-float) (*))
904 (coerce 0 '(complex double-float)))
906 ((simple-array (complex long-float) (*))
907 (coerce 0 '(complex long-float))))))
908 ;; Only arrays have fill-pointers, but vectors have their length
909 ;; parameter in the same place.
910 (setf (%array-fill-pointer vector) new-length)
913 ;;; Fill in array header with the provided information, and return the array.
914 (defun set-array-header (array data length fill-pointer displacement dimensions
915 &optional displacedp)
916 (setf (%array-data-vector array) data)
917 (setf (%array-available-elements array) length)
919 (setf (%array-fill-pointer array) fill-pointer)
920 (setf (%array-fill-pointer-p array) t))
922 (setf (%array-fill-pointer array) length)
923 (setf (%array-fill-pointer-p array) nil)))
924 (setf (%array-displacement array) displacement)
925 (if (listp dimensions)
926 (dotimes (axis (array-rank array))
927 (declare (type index axis))
928 (setf (%array-dimension array axis) (pop dimensions)))
929 (setf (%array-dimension array 0) dimensions))
930 (setf (%array-displaced-p array) displacedp)
933 ;;;; ZAP-ARRAY-DATA for ADJUST-ARRAY
935 ;;; a temporary to be used when OLD-DATA and NEW-DATA are EQ.
936 ;;; KLUDGE: Boy, DYNAMIC-EXTENT would be nice.
937 (defvar *zap-array-data-temp* (make-array 1000 :initial-element t))
939 (defun zap-array-data-temp (length element-type initial-element
941 (declare (fixnum length))
942 (when (> length (the fixnum (length *zap-array-data-temp*)))
943 (setf *zap-array-data-temp*
944 (make-array length :initial-element t)))
945 (when initial-element-p
946 (unless (typep initial-element element-type)
947 (error "~S can't be used to initialize an array of type ~S."
948 initial-element element-type))
949 (fill (the simple-vector *zap-array-data-temp*) initial-element
951 *zap-array-data-temp*)
953 ;;; This does the grinding work for ADJUST-ARRAY. It zaps the data
954 ;;; from the OLD-DATA in an arrangement specified by the OLD-DIMS to
955 ;;; the NEW-DATA in an arrangement specified by the NEW-DIMS. OFFSET
956 ;;; is a displaced offset to be added to computed indices of OLD-DATA.
957 ;;; NEW-LENGTH, ELEMENT-TYPE, INITIAL-ELEMENT, and INITIAL-ELEMENT-P
958 ;;; are used when OLD-DATA and NEW-DATA are EQ; in this case, a
959 ;;; temporary must be used and filled appropriately. When OLD-DATA and
960 ;;; NEW-DATA are not EQ, NEW-DATA has already been filled with any
961 ;;; specified initial-element.
962 (defun zap-array-data (old-data old-dims offset new-data new-dims new-length
963 element-type initial-element initial-element-p)
964 (declare (list old-dims new-dims))
965 (setq old-dims (nreverse old-dims))
966 (setq new-dims (reverse new-dims))
967 (if (eq old-data new-data)
968 (let ((temp (zap-array-data-temp new-length element-type
969 initial-element initial-element-p)))
970 (zap-array-data-aux old-data old-dims offset temp new-dims)
971 (dotimes (i new-length) (setf (aref new-data i) (aref temp i))))
972 (zap-array-data-aux old-data old-dims offset new-data new-dims)))
974 (defun zap-array-data-aux (old-data old-dims offset new-data new-dims)
975 (declare (fixnum offset))
976 (let ((limits (mapcar (lambda (x y)
977 (declare (fixnum x y))
978 (1- (the fixnum (min x y))))
980 (macrolet ((bump-index-list (index limits)
981 `(do ((subscripts ,index (cdr subscripts))
982 (limits ,limits (cdr limits)))
983 ((null subscripts) nil)
984 (cond ((< (the fixnum (car subscripts))
985 (the fixnum (car limits)))
987 (1+ (the fixnum (car subscripts))))
989 (t (rplaca subscripts 0))))))
990 (do ((index (make-list (length old-dims) :initial-element 0)
991 (bump-index-list index limits)))
993 (setf (aref new-data (row-major-index-from-dims index new-dims))
995 (+ (the fixnum (row-major-index-from-dims index old-dims))
998 ;;; Figure out the row-major-order index of an array reference from a
999 ;;; list of subscripts and a list of dimensions. This is for internal
1000 ;;; calls only, and the subscripts and dim-list variables are assumed
1001 ;;; to be reversed from what the user supplied.
1002 (defun row-major-index-from-dims (rev-subscripts rev-dim-list)
1003 (do ((rev-subscripts rev-subscripts (cdr rev-subscripts))
1004 (rev-dim-list rev-dim-list (cdr rev-dim-list))
1007 ((null rev-dim-list) result)
1008 (declare (fixnum chunk-size result))
1009 (setq result (+ result
1010 (the fixnum (* (the fixnum (car rev-subscripts))
1012 (setq chunk-size (* chunk-size (the fixnum (car rev-dim-list))))))
1016 (defun bit-array-same-dimensions-p (array1 array2)
1017 (declare (type (array bit) array1 array2))
1018 (and (= (array-rank array1)
1019 (array-rank array2))
1020 (dotimes (index (array-rank array1) t)
1021 (when (/= (array-dimension array1 index)
1022 (array-dimension array2 index))
1025 (defun pick-result-array (result-bit-array bit-array-1)
1026 (case result-bit-array
1028 ((nil) (make-array (array-dimensions bit-array-1)
1030 :initial-element 0))
1032 (unless (bit-array-same-dimensions-p bit-array-1
1034 (error "~S and ~S don't have the same dimensions."
1035 bit-array-1 result-bit-array))
1038 (defmacro def-bit-array-op (name function)
1039 `(defun ,name (bit-array-1 bit-array-2 &optional result-bit-array)
1041 "Perform a bit-wise ~A on the elements of BIT-ARRAY-1 and ~
1042 BIT-ARRAY-2,~% putting the results in RESULT-BIT-ARRAY. ~
1043 If RESULT-BIT-ARRAY is T,~% BIT-ARRAY-1 is used. If ~
1044 RESULT-BIT-ARRAY is NIL or omitted, a new array is~% created. ~
1045 All the arrays must have the same rank and dimensions."
1046 (symbol-name function))
1047 (declare (type (array bit) bit-array-1 bit-array-2)
1048 (type (or (array bit) (member t nil)) result-bit-array))
1049 (unless (bit-array-same-dimensions-p bit-array-1 bit-array-2)
1050 (error "~S and ~S don't have the same dimensions."
1051 bit-array-1 bit-array-2))
1052 (let ((result-bit-array (pick-result-array result-bit-array bit-array-1)))
1053 (if (and (simple-bit-vector-p bit-array-1)
1054 (simple-bit-vector-p bit-array-2)
1055 (simple-bit-vector-p result-bit-array))
1056 (locally (declare (optimize (speed 3) (safety 0)))
1057 (,name bit-array-1 bit-array-2 result-bit-array))
1058 (with-array-data ((data1 bit-array-1) (start1) (end1))
1059 (declare (ignore end1))
1060 (with-array-data ((data2 bit-array-2) (start2) (end2))
1061 (declare (ignore end2))
1062 (with-array-data ((data3 result-bit-array) (start3) (end3))
1063 (do ((index-1 start1 (1+ index-1))
1064 (index-2 start2 (1+ index-2))
1065 (index-3 start3 (1+ index-3)))
1066 ((>= index-3 end3) result-bit-array)
1067 (declare (type index index-1 index-2 index-3))
1068 (setf (sbit data3 index-3)
1069 (logand (,function (sbit data1 index-1)
1070 (sbit data2 index-2))
1073 (def-bit-array-op bit-and logand)
1074 (def-bit-array-op bit-ior logior)
1075 (def-bit-array-op bit-xor logxor)
1076 (def-bit-array-op bit-eqv logeqv)
1077 (def-bit-array-op bit-nand lognand)
1078 (def-bit-array-op bit-nor lognor)
1079 (def-bit-array-op bit-andc1 logandc1)
1080 (def-bit-array-op bit-andc2 logandc2)
1081 (def-bit-array-op bit-orc1 logorc1)
1082 (def-bit-array-op bit-orc2 logorc2)
1084 (defun bit-not (bit-array &optional result-bit-array)
1086 "Performs a bit-wise logical NOT on the elements of BIT-ARRAY,
1087 putting the results in RESULT-BIT-ARRAY. If RESULT-BIT-ARRAY is T,
1088 BIT-ARRAY is used. If RESULT-BIT-ARRAY is NIL or omitted, a new array is
1089 created. Both arrays must have the same rank and dimensions."
1090 (declare (type (array bit) bit-array)
1091 (type (or (array bit) (member t nil)) result-bit-array))
1092 (let ((result-bit-array (pick-result-array result-bit-array bit-array)))
1093 (if (and (simple-bit-vector-p bit-array)
1094 (simple-bit-vector-p result-bit-array))
1095 (locally (declare (optimize (speed 3) (safety 0)))
1096 (bit-not bit-array result-bit-array))
1097 (with-array-data ((src bit-array) (src-start) (src-end))
1098 (declare (ignore src-end))
1099 (with-array-data ((dst result-bit-array) (dst-start) (dst-end))
1100 (do ((src-index src-start (1+ src-index))
1101 (dst-index dst-start (1+ dst-index)))
1102 ((>= dst-index dst-end) result-bit-array)
1103 (declare (type index src-index dst-index))
1104 (setf (sbit dst dst-index)
1105 (logxor (sbit src src-index) 1))))))))