1 ;;;; allocation VOPs for the x86
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.
15 (defoptimizer (list stack-allocate-result) ((&rest args))
17 (defoptimizer (list* stack-allocate-result) ((&rest args))
18 (not (null (rest args))))
20 (define-vop (list-or-list*)
21 (:args (things :more t))
22 (:temporary (:sc unsigned-reg) ptr temp)
23 (:temporary (:sc unsigned-reg :to (:result 0) :target result) res)
25 (:results (result :scs (descriptor-reg)))
31 ;; (move result nil-value)
32 (inst mov result nil-value))
34 (move result (tn-ref-tn things)))
37 ((store-car (tn list &optional (slot cons-car-slot))
40 ((any-reg descriptor-reg) ,tn)
44 (storew reg ,list ,slot list-pointer-lowtag))))
45 (let ((cons-cells (if star (1- num) num)))
47 (allocation res (* (pad-data-block cons-size) cons-cells) node
48 (awhen (sb!c::node-lvar node) (sb!c::lvar-dynamic-extent it)))
50 (make-ea :byte :base res :disp list-pointer-lowtag))
52 (dotimes (i (1- cons-cells))
53 (store-car (tn-ref-tn things) ptr)
54 (setf things (tn-ref-across things))
55 (inst add ptr (pad-data-block cons-size))
56 (storew ptr ptr (- cons-cdr-slot cons-size)
58 (store-car (tn-ref-tn things) ptr)
60 (setf things (tn-ref-across things))
61 (store-car (tn-ref-tn things) ptr cons-cdr-slot))
63 (storew nil-value ptr cons-cdr-slot
64 list-pointer-lowtag)))
65 (aver (null (tn-ref-across things)))))
66 (move result res))))))
68 (define-vop (list list-or-list*)
71 (define-vop (list* list-or-list*)
74 ;;;; special-purpose inline allocators
77 (define-vop (allocate-vector-on-heap)
78 (:args (type :scs (unsigned-reg immediate))
79 (length :scs (any-reg immediate))
80 (words :scs (any-reg immediate)))
81 (:results (result :scs (descriptor-reg) :from :load))
82 (:arg-types positive-fixnum
87 (let ((size (sc-case words
89 (logandc2 (+ (fixnumize (tn-value words))
90 (+ (1- (ash 1 n-lowtag-bits))
91 (* vector-data-offset n-word-bytes)))
94 (inst lea result (make-ea :byte :base words :disp
95 (+ (1- (ash 1 n-lowtag-bits))
98 (inst and result (lognot lowtag-mask))
101 (allocation result size)
102 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
105 (aver (typep (tn-value type) '(unsigned-byte 8)))
106 (storeb (tn-value type) result 0 other-pointer-lowtag))
108 (storew type result 0 other-pointer-lowtag)))
111 (let ((fixnum-length (fixnumize (tn-value length))))
112 (typecase fixnum-length
114 (storeb fixnum-length result
115 vector-length-slot other-pointer-lowtag))
117 (storew fixnum-length result
118 vector-length-slot other-pointer-lowtag)))))
120 (storew length result vector-length-slot other-pointer-lowtag)))))))
122 (define-vop (allocate-vector-on-stack)
123 (:args (type :scs (unsigned-reg immediate))
124 (length :scs (any-reg))
125 (words :scs (any-reg) :target ecx))
126 (:temporary (:sc any-reg :offset ecx-offset :from (:argument 2)) ecx)
127 (:temporary (:sc any-reg :offset eax-offset :from (:argument 2)) zero)
128 (:temporary (:sc any-reg :offset edi-offset :from (:argument 0)) res)
129 (:results (result :scs (descriptor-reg) :from :load))
130 (:arg-types positive-fixnum
133 (:translate allocate-vector)
137 (inst lea result (make-ea :byte :base words :disp
138 (+ (1- (ash 1 n-lowtag-bits))
139 (* vector-data-offset n-word-bytes))))
140 (inst and result (lognot lowtag-mask))
141 ;; FIXME: It would be good to check for stack overflow here.
143 (inst shr ecx n-fixnum-tag-bits)
144 (allocation result result node t)
147 (make-ea :byte :base result :disp (* vector-data-offset n-word-bytes)))
148 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
151 (aver (typep (tn-value type) '(unsigned-byte 8)))
152 (storeb (tn-value type) result 0 other-pointer-lowtag))
154 (storew type result 0 other-pointer-lowtag)))
155 (storew length result vector-length-slot other-pointer-lowtag)
162 (defoptimizer (allocate-vector stack-allocate-result)
163 ((type length words) node)
164 (ecase (policy node stack-allocate-vector)
167 ;; a vector object should fit in one page
168 (values-subtypep (lvar-derived-type words)
170 (specifier-type `(integer 0 ,(- (/ sb!vm::*backend-page-size*
172 sb!vm:vector-data-offset))))))
175 (defoptimizer (allocate-vector ltn-annotate) ((type length words) call ltn-policy)
176 (let ((args (basic-combination-args call))
177 (template (template-or-lose (if (awhen (node-lvar call)
178 (lvar-dynamic-extent it))
179 'sb!vm::allocate-vector-on-stack
180 'sb!vm::allocate-vector-on-heap))))
182 (setf (lvar-info arg)
183 (make-ir2-lvar (primitive-type (lvar-type arg)))))
184 (unless (is-ok-template-use template call (ltn-policy-safe-p ltn-policy))
185 (ltn-default-call call)
186 (return-from allocate-vector-ltn-annotate-optimizer (values)))
187 (setf (basic-combination-info call) template)
188 (setf (node-tail-p call) nil)
191 (annotate-1-value-lvar arg))))
196 (define-vop (allocate-code-object)
197 (:args (boxed-arg :scs (any-reg) :target boxed)
198 (unboxed-arg :scs (any-reg) :target unboxed))
199 (:results (result :scs (descriptor-reg) :from :eval))
200 (:temporary (:sc unsigned-reg :from (:argument 0)) boxed)
201 (:temporary (:sc unsigned-reg :from (:argument 1)) unboxed)
204 (move boxed boxed-arg)
205 (inst add boxed (fixnumize (1+ code-trace-table-offset-slot)))
206 (inst and boxed (lognot lowtag-mask))
207 (move unboxed unboxed-arg)
208 (inst shr unboxed word-shift)
209 (inst add unboxed lowtag-mask)
210 (inst and unboxed (lognot lowtag-mask))
211 (inst mov result boxed)
212 (inst add result unboxed)
214 (allocation result result node)
215 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
216 (inst shl boxed (- n-widetag-bits word-shift))
217 (inst or boxed code-header-widetag)
218 (storew boxed result 0 other-pointer-lowtag)
219 (storew unboxed result code-code-size-slot other-pointer-lowtag)
220 (storew nil-value result code-entry-points-slot other-pointer-lowtag))
221 (storew nil-value result code-debug-info-slot other-pointer-lowtag)))
223 (define-vop (make-fdefn)
225 (:translate make-fdefn)
226 (:args (name :scs (descriptor-reg) :to :eval))
227 (:results (result :scs (descriptor-reg) :from :argument))
230 (with-fixed-allocation (result fdefn-widetag fdefn-size node)
231 (storew name result fdefn-name-slot other-pointer-lowtag)
232 (storew nil-value result fdefn-fun-slot other-pointer-lowtag)
233 (storew (make-fixup "undefined_tramp" :foreign)
234 result fdefn-raw-addr-slot other-pointer-lowtag))))
236 (define-vop (make-closure)
237 (:args (function :to :save :scs (descriptor-reg)))
238 (:info length stack-allocate-p)
239 (:temporary (:sc any-reg) temp)
240 (:results (result :scs (descriptor-reg)))
243 (maybe-pseudo-atomic stack-allocate-p
244 (let ((size (+ length closure-info-offset)))
245 (allocation result (pad-data-block size) node
248 (make-ea :byte :base result :disp fun-pointer-lowtag))
249 (storew (logior (ash (1- size) n-widetag-bits) closure-header-widetag)
250 result 0 fun-pointer-lowtag))
251 (loadw temp function closure-fun-slot fun-pointer-lowtag)
252 (storew temp result closure-fun-slot fun-pointer-lowtag))))
254 ;;; The compiler likes to be able to directly make value cells.
255 (define-vop (make-value-cell)
256 (:args (value :scs (descriptor-reg any-reg) :to :result))
257 (:results (result :scs (descriptor-reg) :from :eval))
258 (:info stack-allocate-p)
261 (with-fixed-allocation
262 (result value-cell-header-widetag value-cell-size node stack-allocate-p)
263 (storew value result value-cell-value-slot other-pointer-lowtag))))
265 ;;;; automatic allocators for primitive objects
267 (define-vop (make-unbound-marker)
269 (:results (result :scs (any-reg)))
271 (inst mov result unbound-marker-widetag)))
273 (define-vop (make-funcallable-instance-tramp)
275 (:results (result :scs (any-reg)))
277 (inst lea result (make-fixup "funcallable_instance_tramp" :foreign))))
279 (define-vop (fixed-alloc)
281 (:info name words type lowtag)
283 (:results (result :scs (descriptor-reg)))
286 ;; We special case the allocation of conses, because they're
287 ;; extremely common and because the pseudo-atomic sequence on x86
288 ;; is relatively heavyweight. However, if the user asks for top
289 ;; speed, we accomodate him. The primary reason that we don't
290 ;; also check for (< SPEED SPACE) is because we want the space
291 ;; savings that these out-of-line allocation routines bring whilst
292 ;; compiling SBCL itself. --njf, 2006-07-08
293 (if (and (= lowtag list-pointer-lowtag) (policy node (< speed 3)))
295 #.(loop for offset in *dword-regs*
297 ',(intern (format nil "ALLOCATE-CONS-TO-~A"
298 (svref *dword-register-names*
299 offset)))) into cases
300 finally (return `(case (tn-offset result)
303 (inst call (make-fixup dst :assembly-routine)))
305 (allocation result (pad-data-block words) node)
306 (inst lea result (make-ea :byte :base result :disp lowtag))
308 (storew (logior (ash (1- words) n-widetag-bits) type)
313 (define-vop (var-alloc)
314 (:args (extra :scs (any-reg)))
315 (:arg-types positive-fixnum)
316 (:info name words type lowtag)
318 (:results (result :scs (descriptor-reg) :from (:eval 1)))
319 (:temporary (:sc any-reg :from :eval :to (:eval 1)) bytes)
320 (:temporary (:sc any-reg :from :eval :to :result) header)
324 (make-ea :dword :base extra :disp (* (1+ words) n-word-bytes)))
325 (inst mov header bytes)
326 (inst shl header (- n-widetag-bits 2)) ; w+1 to length field
327 (inst lea header ; (w-1 << 8) | type
328 (make-ea :dword :base header :disp (+ (ash -2 n-widetag-bits) type)))
329 (inst and bytes (lognot lowtag-mask))
331 (allocation result bytes node)
332 (inst lea result (make-ea :byte :base result :disp lowtag))
333 (storew header result 0 lowtag))))