1 ;;;; allocation VOPs for the x86-64
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.
14 ;;;; CONS, LIST and LIST*
15 (defoptimizer (cons stack-allocate-result
) ((&rest args
))
17 (defoptimizer (list stack-allocate-result
) ((&rest args
))
19 (defoptimizer (list* stack-allocate-result
) ((&rest args
))
20 (not (null (rest args
))))
22 (define-vop (list-or-list*)
23 (:args
(things :more t
))
24 (:temporary
(:sc unsigned-reg
) ptr temp
)
25 (:temporary
(:sc unsigned-reg
:to
(:result
0) :target result
) res
)
27 (:results
(result :scs
(descriptor-reg)))
33 ;; (move result nil-value)
34 (inst mov result nil-value
))
36 (move result
(tn-ref-tn things
)))
39 ((store-car (tn list
&optional
(slot cons-car-slot
))
42 ((any-reg descriptor-reg
) ,tn
)
46 (storew reg
,list
,slot list-pointer-lowtag
))))
47 (let ((cons-cells (if star
(1- num
) num
)))
49 (allocation res
(* (pad-data-block cons-size
) cons-cells
) node
50 (awhen (sb!c
::node-lvar node
)
51 (sb!c
::lvar-dynamic-extent it
)))
53 (make-ea :byte
:base res
:disp list-pointer-lowtag
))
55 (dotimes (i (1- cons-cells
))
56 (store-car (tn-ref-tn things
) ptr
)
57 (setf things
(tn-ref-across things
))
58 (inst add ptr
(pad-data-block cons-size
))
59 (storew ptr ptr
(- cons-cdr-slot cons-size
)
61 (store-car (tn-ref-tn things
) ptr
)
63 (setf things
(tn-ref-across things
))
64 (store-car (tn-ref-tn things
) ptr cons-cdr-slot
))
66 (storew nil-value ptr cons-cdr-slot
67 list-pointer-lowtag
)))
68 (aver (null (tn-ref-across things
)))))
69 (move result res
))))))
71 (define-vop (list list-or-list
*)
74 (define-vop (list* list-or-list
*)
77 ;;;; special-purpose inline allocators
80 (define-vop (allocate-vector-on-heap)
81 (:args
(type :scs
(unsigned-reg))
82 (length :scs
(any-reg))
83 (words :scs
(any-reg)))
84 (:results
(result :scs
(descriptor-reg) :from
:load
))
85 (:arg-types positive-fixnum
90 (inst lea result
(make-ea :byte
:base words
:disp
91 (+ (1- (ash 1 n-lowtag-bits
))
92 (* vector-data-offset n-word-bytes
))))
93 (inst and result
(lognot lowtag-mask
))
95 (allocation result result
)
96 (inst lea result
(make-ea :byte
:base result
:disp other-pointer-lowtag
))
97 (storew type result
0 other-pointer-lowtag
)
98 (storew length result vector-length-slot other-pointer-lowtag
))))
100 (define-vop (allocate-vector-on-stack)
101 (:args
(type :scs
(unsigned-reg))
102 (length :scs
(any-reg))
103 (words :scs
(any-reg) :target ecx
))
104 (:temporary
(:sc any-reg
:offset ecx-offset
:from
(:argument
2)) ecx
)
105 (:temporary
(:sc any-reg
:offset eax-offset
:from
(:argument
2)) zero
)
106 (:temporary
(:sc any-reg
:offset edi-offset
:from
(:argument
0)) res
)
107 (:results
(result :scs
(descriptor-reg) :from
:load
))
108 (:arg-types positive-fixnum
111 (:translate allocate-vector
)
115 (inst lea result
(make-ea :byte
:base words
:disp
116 (+ (1- (ash 1 n-lowtag-bits
))
117 (* vector-data-offset n-word-bytes
))))
118 (inst and result
(lognot lowtag-mask
))
119 ;; FIXME: It would be good to check for stack overflow here.
121 (inst shr ecx n-fixnum-tag-bits
)
122 (allocation result result node t
)
125 (make-ea :byte
:base result
:disp
(* vector-data-offset n-word-bytes
)))
126 (inst lea result
(make-ea :byte
:base result
:disp other-pointer-lowtag
))
127 (storew type result
0 other-pointer-lowtag
)
128 (storew length result vector-length-slot other-pointer-lowtag
)
135 (defoptimizer (allocate-vector stack-allocate-result
)
136 ((type length words
) node
)
137 (ecase (policy node stack-allocate-vector
)
140 ;; a vector object should fit in one page
141 (values-subtypep (lvar-derived-type words
)
143 (specifier-type `(integer 0 ,(- (/ sb
!vm
::*backend-page-size
*
145 sb
!vm
:vector-data-offset
))))))
148 (defoptimizer (allocate-vector ltn-annotate
) ((type length words
) call ltn-policy
)
149 (let ((args (basic-combination-args call
))
150 (template (template-or-lose (if (awhen (node-lvar call
)
151 (lvar-dynamic-extent it
))
152 'sb
!vm
::allocate-vector-on-stack
153 'sb
!vm
::allocate-vector-on-heap
))))
155 (setf (lvar-info arg
)
156 (make-ir2-lvar (primitive-type (lvar-type arg
)))))
157 (unless (is-ok-template-use template call
(ltn-policy-safe-p ltn-policy
))
158 (ltn-default-call call
)
159 (return-from allocate-vector-ltn-annotate-optimizer
(values)))
160 (setf (basic-combination-info call
) template
)
161 (setf (node-tail-p call
) nil
)
164 (annotate-1-value-lvar arg
))))
169 (define-vop (allocate-code-object)
170 (:args
(boxed-arg :scs
(any-reg) :target boxed
)
171 (unboxed-arg :scs
(any-reg) :target unboxed
))
172 (:results
(result :scs
(descriptor-reg) :from
:eval
))
173 (:temporary
(:sc unsigned-reg
:from
(:argument
0)) boxed
)
174 (:temporary
(:sc unsigned-reg
:from
(:argument
1)) unboxed
)
177 (move boxed boxed-arg
)
178 (inst add boxed
(fixnumize (1+ code-trace-table-offset-slot
)))
179 (inst and boxed
(lognot lowtag-mask
))
180 (move unboxed unboxed-arg
)
181 (inst shr unboxed word-shift
)
182 (inst add unboxed lowtag-mask
)
183 (inst and unboxed
(lognot lowtag-mask
))
184 (inst mov result boxed
)
185 (inst add result unboxed
)
187 (allocation result result node
)
188 (inst lea result
(make-ea :byte
:base result
:disp other-pointer-lowtag
))
189 (inst shl boxed
(- n-widetag-bits word-shift
))
190 (inst or boxed code-header-widetag
)
191 (storew boxed result
0 other-pointer-lowtag
)
192 (storew unboxed result code-code-size-slot other-pointer-lowtag
)
193 (storew nil-value result code-entry-points-slot other-pointer-lowtag
))
194 (storew nil-value result code-debug-info-slot other-pointer-lowtag
)))
196 (define-vop (make-fdefn)
198 (:translate make-fdefn
)
199 (:args
(name :scs
(descriptor-reg) :to
:eval
))
200 (:results
(result :scs
(descriptor-reg) :from
:argument
))
203 (with-fixed-allocation (result fdefn-widetag fdefn-size node
)
204 (storew name result fdefn-name-slot other-pointer-lowtag
)
205 (storew nil-value result fdefn-fun-slot other-pointer-lowtag
)
206 (storew (make-fixup "undefined_tramp" :foreign
)
207 result fdefn-raw-addr-slot other-pointer-lowtag
))))
209 (define-vop (make-closure)
210 (:args
(function :to
:save
:scs
(descriptor-reg)))
211 (:info length stack-allocate-p
)
212 (:temporary
(:sc any-reg
) temp
)
213 (:results
(result :scs
(descriptor-reg)))
216 (maybe-pseudo-atomic stack-allocate-p
217 (let ((size (+ length closure-info-offset
)))
218 (allocation result
(pad-data-block size
) node stack-allocate-p
)
220 (make-ea :byte
:base result
:disp fun-pointer-lowtag
))
221 (storew (logior (ash (1- size
) n-widetag-bits
) closure-header-widetag
)
222 result
0 fun-pointer-lowtag
))
223 (loadw temp function closure-fun-slot fun-pointer-lowtag
)
224 (storew temp result closure-fun-slot fun-pointer-lowtag
))))
226 ;;; The compiler likes to be able to directly make value cells.
227 (define-vop (make-value-cell)
228 (:args
(value :scs
(descriptor-reg any-reg
) :to
:result
))
229 (:results
(result :scs
(descriptor-reg) :from
:eval
))
230 (:info stack-allocate-p
)
233 (with-fixed-allocation
234 (result value-cell-header-widetag value-cell-size node stack-allocate-p
)
235 (storew value result value-cell-value-slot other-pointer-lowtag
))))
237 ;;;; automatic allocators for primitive objects
239 (define-vop (make-unbound-marker)
241 (:results
(result :scs
(any-reg)))
243 (inst mov result unbound-marker-widetag
)))
245 (define-vop (make-funcallable-instance-tramp)
247 (:results
(result :scs
(any-reg)))
249 (inst lea result
(make-fixup "funcallable_instance_tramp" :foreign
))))
251 (define-vop (fixed-alloc)
253 (:info name words type lowtag stack-allocate-p
)
255 (:results
(result :scs
(descriptor-reg)))
258 (maybe-pseudo-atomic stack-allocate-p
259 (allocation result
(pad-data-block words
) node stack-allocate-p
)
260 (inst lea result
(make-ea :byte
:base result
:disp lowtag
))
262 (storew (logior (ash (1- words
) n-widetag-bits
) type
)
267 (define-vop (var-alloc)
268 (:args
(extra :scs
(any-reg)))
269 (:arg-types positive-fixnum
)
270 (:info name words type lowtag
)
272 (:results
(result :scs
(descriptor-reg) :from
(:eval
1)))
273 (:temporary
(:sc any-reg
:from
:eval
:to
(:eval
1)) bytes
)
274 (:temporary
(:sc any-reg
:from
:eval
:to
:result
) header
)
278 (make-ea :qword
:base extra
:disp
(* (1+ words
) n-word-bytes
)))
279 (inst mov header bytes
)
280 (inst shl header
(- n-widetag-bits
3)) ; w+1 to length field
281 (inst lea header
; (w-1 << 8) | type
282 (make-ea :qword
:base header
:disp
(+ (ash -
2 n-widetag-bits
) type
)))
283 (inst and bytes
(lognot lowtag-mask
))
285 (allocation result bytes node
)
286 (inst lea result
(make-ea :byte
:base result
:disp lowtag
))
287 (storew header result
0 lowtag
))))
289 (define-vop (%make-symbol
)
291 (:translate %make-symbol
)
292 (:args
(name :scs
(descriptor-reg) :to
:eval
))
293 (:temporary
(:sc unsigned-reg
:from
:eval
) temp
)
294 (:results
(result :scs
(descriptor-reg) :from
:argument
))
297 (with-fixed-allocation (result symbol-header-widetag symbol-size node
)
298 (storew name result symbol-name-slot other-pointer-lowtag
)
299 (storew unbound-marker-widetag
302 other-pointer-lowtag
)
303 ;; Set up a random hash value for the symbol. Perhaps the object
304 ;; address could be used for even faster and smaller code!
305 ;; FIXME: We don't mind the symbol hash not being repeatable, so
306 ;; we might as well add in the object address here, too. (Adding entropy
307 ;; is good, even if ANSI doesn't understand that.)
309 (make-fixup "fast_random_state" :foreign
)
311 (inst add temp
12345)
312 (inst mov
(make-fixup "fast_random_state" :foreign
)
314 ;; We want a positive fixnum for the hash value, so discard the LS bits.
316 ;; FIXME: OK, who wants to tell me (CSR) why these two
317 ;; instructions aren't replaced by (INST AND TEMP #x8FFFFFFC)?
318 ;; Are the following two instructions actually faster? Does the
319 ;; difference in behaviour really matter?
321 (inst and temp
#xfffffffc
)
322 (storew temp result symbol-hash-slot other-pointer-lowtag
)
323 (storew nil-value result symbol-plist-slot other-pointer-lowtag
)
324 (storew nil-value result symbol-package-slot other-pointer-lowtag
))))