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 (define-vop (list-or-list*)
16 (:args (things :more t))
17 (:temporary (:sc unsigned-reg) ptr temp)
18 (:temporary (:sc unsigned-reg :to (:result 0) :target result) res)
20 (:results (result :scs (descriptor-reg)))
26 ;; (move result nil-value)
27 (inst mov result nil-value))
29 (move result (tn-ref-tn things)))
32 ((store-car (tn list &optional (slot cons-car-slot))
35 ((any-reg descriptor-reg) ,tn)
39 (storew reg ,list ,slot list-pointer-lowtag))))
40 (let ((cons-cells (if star (1- num) num))
41 (stack-allocate-p (awhen (sb!c::node-lvar node)
42 (sb!c::lvar-dynamic-extent it))))
43 (maybe-pseudo-atomic stack-allocate-p
44 (allocation res (* (pad-data-block cons-size) cons-cells) node
45 stack-allocate-p list-pointer-lowtag)
47 (dotimes (i (1- cons-cells))
48 (store-car (tn-ref-tn things) ptr)
49 (setf things (tn-ref-across things))
50 (inst add ptr (pad-data-block cons-size))
51 (storew ptr ptr (- cons-cdr-slot cons-size)
53 (store-car (tn-ref-tn things) ptr)
55 (setf things (tn-ref-across things))
56 (store-car (tn-ref-tn things) ptr cons-cdr-slot))
58 (storew nil-value ptr cons-cdr-slot
59 list-pointer-lowtag)))
60 (aver (null (tn-ref-across things)))))
61 (move result res))))))
63 (define-vop (list list-or-list*)
66 (define-vop (list* list-or-list*)
69 ;;;; special-purpose inline allocators
72 (define-vop (allocate-vector-on-heap)
73 (:args (type :scs (unsigned-reg))
74 (length :scs (any-reg))
75 (words :scs (any-reg)))
76 (:results (result :scs (descriptor-reg) :from :load))
77 (:arg-types positive-fixnum
82 (inst lea result (make-ea :byte :base words :disp
83 (+ (1- (ash 1 n-lowtag-bits))
84 (* vector-data-offset n-word-bytes))))
85 (inst and result (lognot lowtag-mask))
87 (allocation result result)
88 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
89 (storew type result 0 other-pointer-lowtag)
90 (storew length result vector-length-slot other-pointer-lowtag))))
92 (define-vop (allocate-vector-on-stack)
93 (:args (type :scs (unsigned-reg))
94 (length :scs (any-reg))
95 (words :scs (any-reg) :target ecx))
96 (:temporary (:sc any-reg :offset ecx-offset :from (:argument 2)) ecx)
97 (:temporary (:sc any-reg :offset eax-offset :from (:argument 2)) zero)
98 (:temporary (:sc any-reg :offset edi-offset :from (:argument 0)) res)
99 (:results (result :scs (descriptor-reg) :from :load))
100 (:arg-types positive-fixnum
103 (:translate allocate-vector)
107 (inst lea result (make-ea :byte :base words :disp
108 (+ (1- (ash 1 n-lowtag-bits))
109 (* vector-data-offset n-word-bytes))))
110 (inst and result (lognot lowtag-mask))
111 ;; FIXME: It would be good to check for stack overflow here.
113 (inst shr ecx n-fixnum-tag-bits)
114 (allocation result result node t other-pointer-lowtag)
117 (make-ea :byte :base result :disp (- (* vector-data-offset n-word-bytes)
118 other-pointer-lowtag)))
119 (storew type result 0 other-pointer-lowtag)
120 (storew length result vector-length-slot other-pointer-lowtag)
128 (define-vop (allocate-code-object)
129 (:args (boxed-arg :scs (any-reg) :target boxed)
130 (unboxed-arg :scs (any-reg) :target unboxed))
131 (:results (result :scs (descriptor-reg) :from :eval))
132 (:temporary (:sc unsigned-reg :from (:argument 0)) boxed)
133 (:temporary (:sc unsigned-reg :from (:argument 1)) unboxed)
136 (move boxed boxed-arg)
137 (inst add boxed (fixnumize (1+ code-trace-table-offset-slot)))
138 (inst and boxed (lognot lowtag-mask))
139 (move unboxed unboxed-arg)
140 (inst shr unboxed word-shift)
141 (inst add unboxed lowtag-mask)
142 (inst and unboxed (lognot lowtag-mask))
143 (inst mov result boxed)
144 (inst add result unboxed)
146 (allocation result result node)
147 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
148 (inst shl boxed (- n-widetag-bits word-shift))
149 (inst or boxed code-header-widetag)
150 (storew boxed result 0 other-pointer-lowtag)
151 (storew unboxed result code-code-size-slot other-pointer-lowtag)
152 (storew nil-value result code-entry-points-slot other-pointer-lowtag))
153 (storew nil-value result code-debug-info-slot other-pointer-lowtag)))
155 (define-vop (make-fdefn)
157 (:translate make-fdefn)
158 (:args (name :scs (descriptor-reg) :to :eval))
159 (:results (result :scs (descriptor-reg) :from :argument))
162 (with-fixed-allocation (result fdefn-widetag fdefn-size node)
163 (storew name result fdefn-name-slot other-pointer-lowtag)
164 (storew nil-value result fdefn-fun-slot other-pointer-lowtag)
165 (storew (make-fixup "undefined_tramp" :foreign)
166 result fdefn-raw-addr-slot other-pointer-lowtag))))
168 (define-vop (make-closure)
169 (:args (function :to :save :scs (descriptor-reg)))
170 (:info length stack-allocate-p)
171 (:temporary (:sc any-reg) temp)
172 (:results (result :scs (descriptor-reg)))
175 (maybe-pseudo-atomic stack-allocate-p
176 (let ((size (+ length closure-info-offset)))
177 (allocation result (pad-data-block size) node stack-allocate-p
179 (storew (logior (ash (1- size) n-widetag-bits) closure-header-widetag)
180 result 0 fun-pointer-lowtag))
181 (loadw temp function closure-fun-slot fun-pointer-lowtag)
182 (storew temp result closure-fun-slot fun-pointer-lowtag))))
184 ;;; The compiler likes to be able to directly make value cells.
185 (define-vop (make-value-cell)
186 (:args (value :scs (descriptor-reg any-reg) :to :result))
187 (:results (result :scs (descriptor-reg) :from :eval))
188 (:info stack-allocate-p)
191 (with-fixed-allocation
192 (result value-cell-header-widetag value-cell-size node stack-allocate-p)
193 (storew value result value-cell-value-slot other-pointer-lowtag))))
195 ;;;; automatic allocators for primitive objects
197 (define-vop (make-unbound-marker)
199 (:results (result :scs (any-reg)))
201 (inst mov result unbound-marker-widetag)))
203 (define-vop (make-funcallable-instance-tramp)
205 (:results (result :scs (any-reg)))
207 (inst lea result (make-fixup "funcallable_instance_tramp" :foreign))))
209 (define-vop (fixed-alloc)
211 (:info name words type lowtag stack-allocate-p)
213 (:results (result :scs (descriptor-reg)))
216 (maybe-pseudo-atomic stack-allocate-p
217 (allocation result (pad-data-block words) node stack-allocate-p lowtag)
219 (storew (logior (ash (1- words) n-widetag-bits) type)
224 (define-vop (var-alloc)
225 (:args (extra :scs (any-reg)))
226 (:arg-types positive-fixnum)
227 (:info name words type lowtag)
229 (:results (result :scs (descriptor-reg) :from (:eval 1)))
230 (:temporary (:sc any-reg :from :eval :to (:eval 1)) bytes)
231 (:temporary (:sc any-reg :from :eval :to :result) header)
235 (make-ea :qword :base extra :disp (* (1+ words) n-word-bytes)))
236 (inst mov header bytes)
237 (inst shl header (- n-widetag-bits 3)) ; w+1 to length field
238 (inst lea header ; (w-1 << 8) | type
239 (make-ea :qword :base header :disp (+ (ash -2 n-widetag-bits) type)))
240 (inst and bytes (lognot lowtag-mask))
242 (allocation result bytes node)
243 (inst lea result (make-ea :byte :base result :disp lowtag))
244 (storew header result 0 lowtag))))
246 (define-vop (%make-symbol)
248 (:translate %make-symbol)
249 (:args (name :scs (descriptor-reg) :to :eval))
250 (:temporary (:sc unsigned-reg :from :eval) temp)
251 (:results (result :scs (descriptor-reg) :from :argument))
254 (with-fixed-allocation (result symbol-header-widetag symbol-size node)
255 (storew name result symbol-name-slot other-pointer-lowtag)
256 (storew unbound-marker-widetag
259 other-pointer-lowtag)
260 ;; Set up a random hash value for the symbol. Perhaps the object
261 ;; address could be used for even faster and smaller code!
262 ;; FIXME: We don't mind the symbol hash not being repeatable, so
263 ;; we might as well add in the object address here, too. (Adding entropy
264 ;; is good, even if ANSI doesn't understand that.)
266 (make-fixup "fast_random_state" :foreign)
268 (inst add temp 12345)
269 (inst mov (make-fixup "fast_random_state" :foreign)
271 ;; We want a positive fixnum for the hash value, so discard the LS bits.
273 ;; FIXME: OK, who wants to tell me (CSR) why these two
274 ;; instructions aren't replaced by (INST AND TEMP #x8FFFFFFC)?
275 ;; Are the following two instructions actually faster? Does the
276 ;; difference in behaviour really matter?
278 (inst and temp #xfffffffc)
279 (storew temp result symbol-hash-slot other-pointer-lowtag)
280 (storew nil-value result symbol-plist-slot other-pointer-lowtag)
281 (storew nil-value result symbol-package-slot other-pointer-lowtag))))