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))
79 (length :scs (any-reg))
80 (words :scs (any-reg)))
81 (:results (result :scs (descriptor-reg) :from :load))
82 (:arg-types positive-fixnum
87 (inst lea result (make-ea :byte :base words :disp
88 (+ (1- (ash 1 n-lowtag-bits))
89 (* vector-data-offset n-word-bytes))))
90 (inst and result (lognot lowtag-mask))
92 (allocation result result)
93 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
94 (storew type result 0 other-pointer-lowtag)
95 (storew length result vector-length-slot other-pointer-lowtag))))
97 (define-vop (allocate-vector-on-stack)
98 (:args (type :scs (unsigned-reg))
99 (length :scs (any-reg))
100 (words :scs (any-reg) :target ecx))
101 (:temporary (:sc any-reg :offset ecx-offset :from (:argument 2)) ecx)
102 (:temporary (:sc any-reg :offset eax-offset :from (:argument 2)) zero)
103 (:temporary (:sc any-reg :offset edi-offset :from (:argument 0)) res)
104 (:results (result :scs (descriptor-reg) :from :load))
105 (:arg-types positive-fixnum
108 (:translate allocate-vector)
112 (inst lea result (make-ea :byte :base words :disp
113 (+ (1- (ash 1 n-lowtag-bits))
114 (* vector-data-offset n-word-bytes))))
115 (inst and result (lognot lowtag-mask))
116 ;; FIXME: It would be good to check for stack overflow here.
118 (inst shr ecx n-fixnum-tag-bits)
119 (allocation result result node t)
122 (make-ea :byte :base result :disp (* vector-data-offset n-word-bytes)))
123 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
124 (storew type result 0 other-pointer-lowtag)
125 (storew length result vector-length-slot other-pointer-lowtag)
132 (defoptimizer (allocate-vector stack-allocate-result)
133 ((type length words) node)
134 (ecase (policy node stack-allocate-vector)
137 ;; a vector object should fit in one page
138 (values-subtypep (lvar-derived-type words)
140 (specifier-type `(integer 0 ,(- (/ sb!vm::*backend-page-size*
142 sb!vm:vector-data-offset))))))
145 (defoptimizer (allocate-vector ltn-annotate) ((type length words) call ltn-policy)
146 (let ((args (basic-combination-args call))
147 (template (template-or-lose (if (awhen (node-lvar call)
148 (lvar-dynamic-extent it))
149 'sb!vm::allocate-vector-on-stack
150 'sb!vm::allocate-vector-on-heap))))
152 (setf (lvar-info arg)
153 (make-ir2-lvar (primitive-type (lvar-type arg)))))
154 (unless (is-ok-template-use template call (ltn-policy-safe-p ltn-policy))
155 (ltn-default-call call)
156 (return-from allocate-vector-ltn-annotate-optimizer (values)))
157 (setf (basic-combination-info call) template)
158 (setf (node-tail-p call) nil)
161 (annotate-1-value-lvar arg))))
166 (define-vop (allocate-code-object)
167 (:args (boxed-arg :scs (any-reg) :target boxed)
168 (unboxed-arg :scs (any-reg) :target unboxed))
169 (:results (result :scs (descriptor-reg) :from :eval))
170 (:temporary (:sc unsigned-reg :from (:argument 0)) boxed)
171 (:temporary (:sc unsigned-reg :from (:argument 1)) unboxed)
174 (move boxed boxed-arg)
175 (inst add boxed (fixnumize (1+ code-trace-table-offset-slot)))
176 (inst and boxed (lognot lowtag-mask))
177 (move unboxed unboxed-arg)
178 (inst shr unboxed word-shift)
179 (inst add unboxed lowtag-mask)
180 (inst and unboxed (lognot lowtag-mask))
181 (inst mov result boxed)
182 (inst add result unboxed)
184 (allocation result result node)
185 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
186 (inst shl boxed (- n-widetag-bits word-shift))
187 (inst or boxed code-header-widetag)
188 (storew boxed result 0 other-pointer-lowtag)
189 (storew unboxed result code-code-size-slot other-pointer-lowtag)
190 (storew nil-value result code-entry-points-slot other-pointer-lowtag))
191 (storew nil-value result code-debug-info-slot other-pointer-lowtag)))
193 (define-vop (make-fdefn)
195 (:translate make-fdefn)
196 (:args (name :scs (descriptor-reg) :to :eval))
197 (:results (result :scs (descriptor-reg) :from :argument))
200 (with-fixed-allocation (result fdefn-widetag fdefn-size node)
201 (storew name result fdefn-name-slot other-pointer-lowtag)
202 (storew nil-value result fdefn-fun-slot other-pointer-lowtag)
203 (storew (make-fixup "undefined_tramp" :foreign)
204 result fdefn-raw-addr-slot other-pointer-lowtag))))
206 (define-vop (make-closure)
207 (:args (function :to :save :scs (descriptor-reg)))
208 (:info length stack-allocate-p)
209 (:temporary (:sc any-reg) temp)
210 (:results (result :scs (descriptor-reg)))
213 (maybe-pseudo-atomic stack-allocate-p
214 (let ((size (+ length closure-info-offset)))
215 (allocation result (pad-data-block size) node
218 (make-ea :byte :base result :disp fun-pointer-lowtag))
219 (storew (logior (ash (1- size) n-widetag-bits) closure-header-widetag)
220 result 0 fun-pointer-lowtag))
221 (storew result result closure-self-slot fun-pointer-lowtag)
222 (loadw temp function closure-fun-slot fun-pointer-lowtag)
223 (storew temp result closure-fun-slot fun-pointer-lowtag))))
225 ;;; The compiler likes to be able to directly make value cells.
226 (define-vop (make-value-cell)
227 (:args (value :scs (descriptor-reg any-reg) :to :result))
228 (:results (result :scs (descriptor-reg) :from :eval))
231 (with-fixed-allocation
232 (result value-cell-header-widetag value-cell-size node)
233 (storew value result value-cell-value-slot other-pointer-lowtag))))
235 ;;;; automatic allocators for primitive objects
237 (define-vop (make-unbound-marker)
239 (:results (result :scs (any-reg)))
241 (inst mov result unbound-marker-widetag)))
243 (define-vop (fixed-alloc)
245 (:info name words type lowtag)
247 (:results (result :scs (descriptor-reg)))
251 (allocation result (pad-data-block words) node)
252 (inst lea result (make-ea :byte :base result :disp lowtag))
254 (storew (logior (ash (1- words) n-widetag-bits) type)
259 (define-vop (var-alloc)
260 (:args (extra :scs (any-reg)))
261 (:arg-types positive-fixnum)
262 (:info name words type lowtag)
264 (:results (result :scs (descriptor-reg) :from (:eval 1)))
265 (:temporary (:sc any-reg :from :eval :to (:eval 1)) bytes)
266 (:temporary (:sc any-reg :from :eval :to :result) header)
270 (make-ea :dword :base extra :disp (* (1+ words) n-word-bytes)))
271 (inst mov header bytes)
272 (inst shl header (- n-widetag-bits 2)) ; w+1 to length field
273 (inst lea header ; (w-1 << 8) | type
274 (make-ea :dword :base header :disp (+ (ash -2 n-widetag-bits) type)))
275 (inst and bytes (lognot lowtag-mask))
277 (allocation result bytes node)
278 (inst lea result (make-ea :byte :base result :disp lowtag))
279 (storew header result 0 lowtag))))