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)
49 (sb!c::lvar-dynamic-extent it)))
51 (make-ea :byte :base res :disp list-pointer-lowtag))
53 (dotimes (i (1- cons-cells))
54 (store-car (tn-ref-tn things) ptr)
55 (setf things (tn-ref-across things))
56 (inst add ptr (pad-data-block cons-size))
57 (storew ptr ptr (- cons-cdr-slot cons-size)
59 (store-car (tn-ref-tn things) ptr)
61 (setf things (tn-ref-across things))
62 (store-car (tn-ref-tn things) ptr cons-cdr-slot))
64 (storew nil-value ptr cons-cdr-slot
65 list-pointer-lowtag)))
66 (aver (null (tn-ref-across things)))))
67 (move result res))))))
69 (define-vop (list list-or-list*)
72 (define-vop (list* list-or-list*)
75 ;;;; special-purpose inline allocators
77 (define-vop (allocate-code-object)
78 (:args (boxed-arg :scs (any-reg) :target boxed)
79 (unboxed-arg :scs (any-reg) :target unboxed))
80 (:results (result :scs (descriptor-reg) :from :eval))
81 (:temporary (:sc unsigned-reg :from (:argument 0)) boxed)
82 (:temporary (:sc unsigned-reg :from (:argument 1)) unboxed)
85 (move boxed boxed-arg)
86 (inst add boxed (fixnumize (1+ code-trace-table-offset-slot)))
87 (inst and boxed (lognot lowtag-mask))
88 (move unboxed unboxed-arg)
89 (inst shr unboxed word-shift)
90 (inst add unboxed lowtag-mask)
91 (inst and unboxed (lognot lowtag-mask))
92 (inst mov result boxed)
93 (inst add result unboxed)
95 (allocation result result node)
96 (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
97 (inst shl boxed (- n-widetag-bits word-shift))
98 (inst or boxed code-header-widetag)
99 (storew boxed result 0 other-pointer-lowtag)
100 (storew unboxed result code-code-size-slot other-pointer-lowtag)
101 (storew nil-value result code-entry-points-slot other-pointer-lowtag))
102 (storew nil-value result code-debug-info-slot other-pointer-lowtag)))
104 (define-vop (make-fdefn)
106 (:translate make-fdefn)
107 (:args (name :scs (descriptor-reg) :to :eval))
108 (:results (result :scs (descriptor-reg) :from :argument))
111 (with-fixed-allocation (result fdefn-widetag fdefn-size node)
112 (storew name result fdefn-name-slot other-pointer-lowtag)
113 (storew nil-value result fdefn-fun-slot other-pointer-lowtag)
114 (storew (make-fixup "undefined_tramp" :foreign)
115 result fdefn-raw-addr-slot other-pointer-lowtag))))
117 (define-vop (make-closure)
118 (:args (function :to :save :scs (descriptor-reg)))
119 (:info length stack-allocate-p)
120 (:temporary (:sc any-reg) temp)
121 (:results (result :scs (descriptor-reg)))
124 (maybe-pseudo-atomic stack-allocate-p
125 (let ((size (+ length closure-info-offset)))
126 (allocation result (pad-data-block size) node stack-allocate-p)
128 (make-ea :byte :base result :disp fun-pointer-lowtag))
129 (storew (logior (ash (1- size) n-widetag-bits) closure-header-widetag)
130 result 0 fun-pointer-lowtag))
131 (loadw temp function closure-fun-slot fun-pointer-lowtag)
132 (storew temp result closure-fun-slot fun-pointer-lowtag))))
134 ;;; The compiler likes to be able to directly make value cells.
135 (define-vop (make-value-cell)
136 (:args (value :scs (descriptor-reg any-reg) :to :result))
137 (:results (result :scs (descriptor-reg) :from :eval))
140 (with-fixed-allocation
141 (result value-cell-header-widetag value-cell-size node)
142 (storew value result value-cell-value-slot other-pointer-lowtag))))
144 ;;;; automatic allocators for primitive objects
146 (define-vop (make-unbound-marker)
148 (:results (result :scs (any-reg)))
150 (inst mov result unbound-marker-widetag)))
152 (define-vop (fixed-alloc)
154 (:info name words type lowtag)
156 (:results (result :scs (descriptor-reg)))
160 (allocation result (pad-data-block words) node)
161 (inst lea result (make-ea :byte :base result :disp lowtag))
163 (storew (logior (ash (1- words) n-widetag-bits) type)
168 (define-vop (var-alloc)
169 (:args (extra :scs (any-reg)))
170 (:arg-types positive-fixnum)
171 (:info name words type lowtag)
173 (:results (result :scs (descriptor-reg) :from (:eval 1)))
174 (:temporary (:sc any-reg :from :eval :to (:eval 1)) bytes)
175 (:temporary (:sc any-reg :from :eval :to :result) header)
179 (make-ea :qword :base extra :disp (* (1+ words) n-word-bytes)))
180 (inst mov header bytes)
181 (inst shl header (- n-widetag-bits 3)) ; w+1 to length field
182 (inst lea header ; (w-1 << 8) | type
183 (make-ea :qword :base header :disp (+ (ash -2 n-widetag-bits) type)))
184 (inst and bytes (lognot lowtag-mask))
186 (allocation result bytes node)
187 (inst lea result (make-ea :byte :base result :disp lowtag))
188 (storew header result 0 lowtag))))
190 (define-vop (make-symbol)
192 (:translate make-symbol)
193 (:args (name :scs (descriptor-reg) :to :eval))
194 (:temporary (:sc unsigned-reg :from :eval) temp)
195 (:results (result :scs (descriptor-reg) :from :argument))
198 (with-fixed-allocation (result symbol-header-widetag symbol-size node)
199 (storew name result symbol-name-slot other-pointer-lowtag)
200 (storew unbound-marker-widetag
203 other-pointer-lowtag)
204 ;; Set up a random hash value for the symbol. Perhaps the object
205 ;; address could be used for even faster and smaller code!
206 ;; FIXME: We don't mind the symbol hash not being repeatable, so
207 ;; we might as well add in the object address here, too. (Adding entropy
208 ;; is good, even if ANSI doesn't understand that.)
210 (make-fixup "fast_random_state" :foreign)
212 (inst add temp 12345)
213 (inst mov (make-fixup "fast_random_state" :foreign)
215 ;; We want a positive fixnum for the hash value, so discard the LS bits.
217 ;; FIXME: OK, who wants to tell me (CSR) why these two
218 ;; instructions aren't replaced by (INST AND TEMP #x8FFFFFFC)?
219 ;; Are the following two instructions actually faster? Does the
220 ;; difference in behaviour really matter?
222 (inst and temp #xfffffffc)
223 (storew temp result symbol-hash-slot other-pointer-lowtag)
224 (storew nil-value result symbol-plist-slot other-pointer-lowtag)
225 (storew nil-value result symbol-package-slot other-pointer-lowtag))))