1 ;;;; the VM definition of various primitive memory access VOPs for the
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
15 ;;;; Data object ref/set stuff.
18 (:args
(object :scs
(descriptor-reg)))
19 (:info name offset lowtag
)
21 (:results
(result :scs
(descriptor-reg any-reg
)))
23 (loadw result object offset lowtag
)))
25 (define-vop (set-slot)
26 (:args
(object :scs
(descriptor-reg))
27 (value :scs
(descriptor-reg any-reg
)))
28 (:info name offset lowtag
)
32 (storew value object offset lowtag
)))
34 (define-vop (init-slot set-slot
))
36 ;;;; Symbol hacking VOPs:
38 ;;; The compiler likes to be able to directly SET symbols.
40 (define-vop (set cell-set
)
41 (:variant symbol-value-slot other-pointer-lowtag
))
43 ;;; Do a cell ref with an error check for being unbound.
45 (define-vop (checked-cell-ref)
46 (:args
(object :scs
(descriptor-reg) :target obj-temp
))
47 (:results
(value :scs
(descriptor-reg any-reg
)))
50 (:save-p
:compute-only
)
51 (:temporary
(:scs
(descriptor-reg) :from
(:argument
0)) obj-temp
))
53 ;;; With Symbol-Value, we check that the value isn't the trap object. So
54 ;;; Symbol-Value of NIL is NIL.
56 (define-vop (symbol-value checked-cell-ref
)
57 (:translate symbol-value
)
59 (move obj-temp object
)
60 (loadw value obj-temp symbol-value-slot other-pointer-lowtag
)
61 (let ((err-lab (generate-error-code vop
'unbound-symbol-error obj-temp
)))
62 (inst cmp value unbound-marker-widetag
)
63 (inst b
:eq err-lab
))))
65 ;;; Like CHECKED-CELL-REF, only we are a predicate to see if the cell is bound.
66 (define-vop (boundp-frob)
67 (:args
(object :scs
(descriptor-reg)))
71 (:temporary
(:scs
(descriptor-reg)) value
))
73 (define-vop (boundp boundp-frob
)
76 (loadw value object symbol-value-slot other-pointer-lowtag
)
77 (inst cmp value unbound-marker-widetag
)
78 (inst b
(if not-p
:eq
:ne
) target
)))
80 (define-vop (fast-symbol-value cell-ref
)
81 (:variant symbol-value-slot other-pointer-lowtag
)
83 (:translate symbol-value
))
85 (define-vop (symbol-hash)
87 (:translate symbol-hash
)
88 (:args
(symbol :scs
(descriptor-reg)))
89 (:temporary
(:scs
(non-descriptor-reg)) temp
)
90 (:results
(res :scs
(any-reg)))
91 (:result-types positive-fixnum
)
93 ;; The symbol-hash slot of NIL holds NIL because it is also the
94 ;; cdr slot, so we have to strip off the two low bits to make sure
95 ;; it is a fixnum. The lowtag selection magic that is required to
96 ;; ensure this is explained in the comment in objdef.lisp
97 (loadw temp symbol symbol-hash-slot other-pointer-lowtag
)
98 (inst and res temp
(bic-mask fixnum-tag-mask
))))
100 ;;; On unithreaded builds these are just copies of the non-global versions.
101 (define-vop (%set-symbol-global-value set
))
102 (define-vop (symbol-global-value symbol-value
)
103 (:translate symbol-global-value
))
104 (define-vop (fast-symbol-global-value fast-symbol-value
)
105 (:translate symbol-global-value
))
107 ;;;; Fdefinition (fdefn) objects.
109 (define-vop (fdefn-fun cell-ref
)
110 (:variant fdefn-fun-slot other-pointer-lowtag
))
112 (define-vop (safe-fdefn-fun)
113 (:translate safe-fdefn-fun
)
115 (:args
(object :scs
(descriptor-reg) :to
:save
))
116 (:results
(value :scs
(descriptor-reg any-reg
)))
118 (:save-p
:compute-only
)
120 (loadw value object fdefn-fun-slot other-pointer-lowtag
)
121 (inst cmp value null-tn
)
122 (let ((err-lab (generate-error-code vop
'undefined-fun-error object
)))
123 (inst b
:eq err-lab
))))
125 (define-vop (set-fdefn-fun)
127 (:translate
(setf fdefn-fun
))
128 (:args
(function :scs
(descriptor-reg) :target result
)
129 (fdefn :scs
(descriptor-reg)))
130 (:temporary
(:scs
(interior-reg)) lip
)
131 (:temporary
(:scs
(non-descriptor-reg)) type
)
132 (:results
(result :scs
(descriptor-reg)))
134 (let ((closure-tramp-fixup (gen-label)))
135 (assemble (*elsewhere
*)
136 (emit-label closure-tramp-fixup
)
137 (inst dword
(make-fixup "closure_tramp" :foreign
)))
139 (inst add lip function
(- (* simple-fun-code-offset n-word-bytes
)
141 (load-type type function
(- fun-pointer-lowtag
))
142 (inst cmp type simple-fun-header-widetag
)
143 (inst b
:eq SIMPLE-FUN
)
144 (inst load-from-label lip closure-tramp-fixup
)
146 (storew lip fdefn fdefn-raw-addr-slot other-pointer-lowtag
)
147 (storew function fdefn fdefn-fun-slot other-pointer-lowtag
)
148 (move result function
)))))
150 (define-vop (fdefn-makunbound)
152 (:translate fdefn-makunbound
)
153 (:args
(fdefn :scs
(descriptor-reg) :target result
))
154 (:temporary
(:scs
(non-descriptor-reg)) temp
)
155 (:results
(result :scs
(descriptor-reg)))
157 (let ((undefined-tramp-fixup (gen-label)))
158 (assemble (*elsewhere
*)
159 (emit-label undefined-tramp-fixup
)
160 (inst dword
(make-fixup "undefined_tramp" :foreign
)))
161 (storew null-tn fdefn fdefn-fun-slot other-pointer-lowtag
)
162 (inst load-from-label temp undefined-tramp-fixup
)
163 (storew temp fdefn fdefn-raw-addr-slot other-pointer-lowtag
)
164 (move result fdefn
))))
168 ;;;; Binding and Unbinding.
170 ;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
171 ;;; the symbol on the binding stack and stuff the new value into the
175 (:args
(val :scs
(any-reg descriptor-reg
))
176 (symbol :scs
(descriptor-reg)))
177 (:temporary
(:scs
(descriptor-reg)) value-temp
)
178 (:temporary
(:scs
(any-reg)) bsp-temp
)
180 (loadw value-temp symbol symbol-value-slot other-pointer-lowtag
)
181 (load-symbol-value bsp-temp
*binding-stack-pointer
*)
182 (inst add bsp-temp bsp-temp
(* binding-size n-word-bytes
))
183 (store-symbol-value bsp-temp
*binding-stack-pointer
*)
184 (inst stp value-temp symbol
(@ bsp-temp
(* (- binding-value-slot binding-size
) n-word-bytes
)))
185 (storew val symbol symbol-value-slot other-pointer-lowtag
)))
188 (:temporary
(:scs
(descriptor-reg)) symbol value
)
189 (:temporary
(:scs
(any-reg)) bsp-temp
)
191 (load-symbol-value bsp-temp
*binding-stack-pointer
*)
192 (loadw symbol bsp-temp
(- binding-symbol-slot binding-size
))
193 (loadw value bsp-temp
(- binding-value-slot binding-size
))
194 (storew value symbol symbol-value-slot other-pointer-lowtag
)
195 ;; The order of stores here is reversed with respect to interrupt safety,
196 ;; but STP cannot be interrupted in the middle.
197 (inst stp zr-tn zr-tn
(@ bsp-temp
(* (- binding-value-slot binding-size
)
199 (inst sub bsp-temp bsp-temp
(* binding-size n-word-bytes
))
200 (store-symbol-value bsp-temp
*binding-stack-pointer
*)))
202 (define-vop (unbind-to-here)
203 (:args
(arg :scs
(descriptor-reg any-reg
) :target where
))
204 (:temporary
(:scs
(any-reg) :from
(:argument
0)) where
)
205 (:temporary
(:scs
(descriptor-reg)) symbol value
)
206 (:temporary
(:scs
(any-reg)) bsp-temp
)
208 (load-symbol-value bsp-temp
*binding-stack-pointer
*)
210 (inst cmp where bsp-temp
)
214 (loadw symbol bsp-temp
(- binding-symbol-slot binding-size
))
215 (inst cbz symbol ZERO
)
217 (loadw value bsp-temp
(- binding-value-slot binding-size
))
218 (storew value symbol symbol-value-slot other-pointer-lowtag
)
219 (storew zr-tn bsp-temp
(- binding-symbol-slot binding-size
))
221 (storew zr-tn bsp-temp
(- binding-value-slot binding-size
))
222 (inst sub bsp-temp bsp-temp
(* binding-size n-word-bytes
))
223 (inst cmp where bsp-temp
)
227 (store-symbol-value bsp-temp
*binding-stack-pointer
*)))
229 ;;;; Closure indexing.
231 (define-full-reffer closure-index-ref
*
232 closure-info-offset fun-pointer-lowtag
233 (descriptor-reg any-reg
) * %closure-index-ref
)
235 (define-full-setter set-funcallable-instance-info
*
236 funcallable-instance-info-offset fun-pointer-lowtag
237 (descriptor-reg any-reg null
) * %set-funcallable-instance-info
)
239 (define-full-reffer funcallable-instance-info
*
240 funcallable-instance-info-offset fun-pointer-lowtag
241 (descriptor-reg any-reg
) * %funcallable-instance-info
)
243 (define-vop (closure-ref slot-ref
)
244 (:variant closure-info-offset fun-pointer-lowtag
))
246 (define-vop (closure-init slot-set
)
247 (:variant closure-info-offset fun-pointer-lowtag
))
249 (define-vop (closure-init-from-fp)
250 (:args
(object :scs
(descriptor-reg)))
253 (storew cfp-tn object
(+ closure-info-offset offset
) fun-pointer-lowtag
)))
255 ;;;; Value Cell hackery.
257 (define-vop (value-cell-ref cell-ref
)
258 (:variant value-cell-value-slot other-pointer-lowtag
))
260 (define-vop (value-cell-set cell-set
)
261 (:variant value-cell-value-slot other-pointer-lowtag
))
263 ;;;; Instance hackery:
265 (define-vop (instance-length)
267 (:translate %instance-length
)
268 (:args
(struct :scs
(descriptor-reg)))
269 (:temporary
(:scs
(non-descriptor-reg)) temp
)
270 (:results
(res :scs
(unsigned-reg)))
271 (:result-types positive-fixnum
)
273 (loadw temp struct
0 instance-pointer-lowtag
)
274 (inst lsr res temp n-widetag-bits
)))
276 (define-full-reffer instance-index-ref
* instance-slots-offset
277 instance-pointer-lowtag
(descriptor-reg any-reg
) * %instance-ref
)
279 (define-full-setter instance-index-set
* instance-slots-offset
280 instance-pointer-lowtag
(descriptor-reg any-reg null
) * %instance-set
)
282 ;;;; Code object frobbing.
284 (define-full-reffer code-header-ref
* 0 other-pointer-lowtag
285 (descriptor-reg any-reg
) * code-header-ref
)
287 (define-full-setter code-header-set
* 0 other-pointer-lowtag
288 (descriptor-reg any-reg null
) * code-header-set
)
290 ;;;; raw instance slot accessors
293 ((define-raw-slot-vops (name value-primtype value-sc
294 &key
(width 1) (move-macro 'move
))
295 (labels ((emit-generator (instruction move-result
)
296 `((loadw offset object
0 instance-pointer-lowtag
)
297 (inst lsr offset offset n-widetag-bits
)
298 (inst lsl offset offset word-shift
)
299 (inst sub offset offset
(lsl index
(- word-shift n-fixnum-tag-bits
)))
300 (inst sub offset offset
(+ (* (- ,width
301 instance-slots-offset
)
303 instance-pointer-lowtag
))
304 (inst ,instruction value
(@ object offset
))
306 `((,move-macro result value
))))))
307 (let ((ref-vop (symbolicate "RAW-INSTANCE-REF/" name
))
308 (set-vop (symbolicate "RAW-INSTANCE-SET/" name
)))
310 (define-vop (,ref-vop
)
311 (:translate
,(symbolicate "%" ref-vop
))
313 (:args
(object :scs
(descriptor-reg))
314 (index :scs
(any-reg)))
315 (:arg-types
* positive-fixnum
)
316 (:results
(value :scs
(,value-sc
)))
317 (:result-types
,value-primtype
)
318 (:temporary
(:scs
(non-descriptor-reg)) offset
)
319 (:generator
5 ,@(emit-generator 'ldr nil
)))
320 (define-vop (,set-vop
)
321 (:translate
,(symbolicate "%" set-vop
))
323 (:args
(object :scs
(descriptor-reg))
324 (index :scs
(any-reg))
325 (value :scs
(,value-sc
) :target result
))
326 (:arg-types
* positive-fixnum
,value-primtype
)
327 (:results
(result :scs
(,value-sc
)))
328 (:result-types
,value-primtype
)
329 (:temporary
(:scs
(non-descriptor-reg)) offset
)
330 (:generator
5 ,@(emit-generator 'str t
))))))))
331 (define-raw-slot-vops word unsigned-num unsigned-reg
)
332 (define-raw-slot-vops single single-float single-reg
333 :move-macro move-float
)
334 (define-raw-slot-vops double double-float double-reg
335 :move-macro move-float
)
336 (define-raw-slot-vops complex-single complex-single-float complex-single-reg
337 :move-macro move-float
)
338 (define-raw-slot-vops complex-double complex-double-float complex-double-reg
339 :width
2 :move-macro move-complex-double
))