1 ;;;; various primitive memory access VOPs for the x86 VM
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 ;;;; data object ref/set stuff
17 (:args (object :scs (descriptor-reg)))
18 (:info name offset lowtag)
20 (:results (result :scs (descriptor-reg any-reg)))
22 (loadw result object offset lowtag)))
24 (define-vop (set-slot)
25 (:args (object :scs (descriptor-reg))
26 (value :scs (descriptor-reg any-reg immediate)))
27 (:info name offset lowtag)
31 (if (sc-is value immediate)
32 (let ((val (tn-value value)))
36 (make-ea :dword :base object
37 :disp (- (* offset n-word-bytes) lowtag))
41 (make-ea :dword :base object
42 :disp (- (* offset n-word-bytes) lowtag))
43 (+ nil-value (static-symbol-offset val))))
46 (make-ea :dword :base object
47 :disp (- (* offset n-word-bytes) lowtag))
48 (logior (ash (char-code val) n-widetag-bits)
49 base-char-widetag)))))
50 ;; Else, value not immediate.
51 (storew value object offset lowtag))))
55 ;;;; symbol hacking VOPs
57 ;;; these next two cf the sparc version, by jrd.
58 ;;; FIXME: Deref this ^ reference.
61 ;;; The compiler likes to be able to directly SET symbols.
64 (:args (symbol :scs (descriptor-reg))
65 (value :scs (descriptor-reg any-reg)))
66 (:translate sb!kernel:%set-symbol-value)
67 (:temporary (:sc descriptor-reg ) tls)
68 ;;(:policy :fast-safe)
70 (let ((global-val (gen-label))
72 (loadw tls symbol symbol-tls-index-slot other-pointer-lowtag)
74 (inst jmp :z global-val)
75 (inst fs-segment-prefix)
76 (inst cmp (make-ea :dword :scale 1 :index tls) unbound-marker-widetag)
77 (inst jmp :z global-val)
78 (inst fs-segment-prefix)
79 (inst mov (make-ea :dword :scale 1 :index tls) value)
81 (emit-label global-val)
82 (storew value symbol symbol-value-slot other-pointer-lowtag)
85 ;; unithreaded it's a lot simpler ...
87 (define-vop (set cell-set)
88 (:variant symbol-value-slot other-pointer-lowtag))
90 ;;; Do a cell ref with an error check for being unbound.
91 ;;; XXX stil used? I can't see where -dan
92 (define-vop (checked-cell-ref)
93 (:args (object :scs (descriptor-reg) :target obj-temp))
94 (:results (value :scs (descriptor-reg any-reg)))
97 (:save-p :compute-only)
98 (:temporary (:sc descriptor-reg :from (:argument 0)) obj-temp))
100 ;;; With Symbol-Value, we check that the value isn't the trap object. So
101 ;;; Symbol-Value of NIL is NIL.
103 (define-vop (symbol-value)
104 (:translate symbol-value)
106 (:args (object :scs (descriptor-reg) :to (:result 1)))
107 (:results (value :scs (descriptor-reg any-reg)))
109 (:save-p :compute-only)
111 (let* ((err-lab (generate-error-code vop unbound-symbol-error object))
112 (ret-lab (gen-label)))
113 (loadw value object symbol-tls-index-slot other-pointer-lowtag)
114 (inst fs-segment-prefix)
115 (inst mov value (make-ea :dword :index value :scale 1))
116 (inst cmp value unbound-marker-widetag)
117 (inst jmp :ne ret-lab)
118 (loadw value object symbol-value-slot other-pointer-lowtag)
119 (inst cmp value unbound-marker-widetag)
120 (inst jmp :e err-lab)
121 (emit-label ret-lab))))
124 (define-vop (fast-symbol-value symbol-value)
126 (:translate symbol-value))
129 (define-vop (symbol-value)
130 (:translate symbol-value)
132 (:args (object :scs (descriptor-reg) :to (:result 1)))
133 (:results (value :scs (descriptor-reg any-reg)))
135 (:save-p :compute-only)
137 (let ((err-lab (generate-error-code vop unbound-symbol-error object)))
138 (loadw value object symbol-value-slot other-pointer-lowtag)
139 (inst cmp value unbound-marker-widetag)
140 (inst jmp :e err-lab))))
143 (define-vop (fast-symbol-value cell-ref)
144 (:variant symbol-value-slot other-pointer-lowtag)
146 (:translate symbol-value))
148 (defknown locked-symbol-global-value-add (symbol fixnum) fixnum ())
150 (define-vop (locked-symbol-global-value-add)
151 (:args (object :scs (descriptor-reg) :to :result)
152 (value :scs (any-reg) :target result))
153 (:arg-types * tagged-num)
154 (:results (result :scs (any-reg) :from (:argument 1)))
156 (:translate locked-symbol-global-value-add)
157 (:result-types tagged-num)
162 (inst add (make-ea :dword :base object
163 :disp (- (* symbol-value-slot n-word-bytes)
164 other-pointer-lowtag))
171 (:args (object :scs (descriptor-reg)))
174 (:temporary (:sc descriptor-reg #+nil(:from (:argument 0))) value)
177 (let ((not-target (gen-label)))
178 (loadw value object symbol-value-slot other-pointer-lowtag)
179 (inst cmp value unbound-marker-widetag)
180 (inst jmp :ne not-target)
181 (loadw value object symbol-tls-index-slot other-pointer-lowtag)
182 (inst fs-segment-prefix)
183 (inst cmp (make-ea :dword :index value :scale 1) unbound-marker-widetag)
185 (emit-label not-target))
187 (loadw value object symbol-value-slot other-pointer-lowtag)
188 (inst cmp value unbound-marker-widetag)
189 (inst jmp :ne target)
190 (loadw value object symbol-tls-index-slot other-pointer-lowtag)
191 (inst fs-segment-prefix)
192 (inst cmp (make-ea :dword :index value :scale 1) unbound-marker-widetag)
193 (inst jmp :ne target)))))
199 (:args (object :scs (descriptor-reg)))
202 (:temporary (:sc descriptor-reg :from (:argument 0)) value)
204 (loadw value object symbol-value-slot other-pointer-lowtag)
205 (inst cmp value unbound-marker-widetag)
206 (inst jmp (if not-p :e :ne) target)))
209 (define-vop (symbol-hash)
211 (:translate symbol-hash)
212 (:args (symbol :scs (descriptor-reg)))
213 (:results (res :scs (any-reg)))
214 (:result-types positive-fixnum)
216 ;; The symbol-hash slot of NIL holds NIL because it is also the
217 ;; cdr slot, so we have to strip off the two low bits to make sure
218 ;; it is a fixnum. The lowtag selection magic that is required to
219 ;; ensure this is explained in the comment in objdef.lisp
220 (loadw res symbol symbol-hash-slot other-pointer-lowtag)
221 (inst and res (lognot #b11))))
223 ;;;; fdefinition (FDEFN) objects
225 (define-vop (fdefn-fun cell-ref) ; /pfw - alpha
226 (:variant fdefn-fun-slot other-pointer-lowtag))
228 (define-vop (safe-fdefn-fun)
229 (:args (object :scs (descriptor-reg) :to (:result 1)))
230 (:results (value :scs (descriptor-reg any-reg)))
232 (:save-p :compute-only)
234 (loadw value object fdefn-fun-slot other-pointer-lowtag)
235 (inst cmp value nil-value)
236 (let ((err-lab (generate-error-code vop undefined-fun-error object)))
237 (inst jmp :e err-lab))))
239 (define-vop (set-fdefn-fun)
241 (:translate (setf fdefn-fun))
242 (:args (function :scs (descriptor-reg) :target result)
243 (fdefn :scs (descriptor-reg)))
244 (:temporary (:sc unsigned-reg) raw)
245 (:temporary (:sc byte-reg) type)
246 (:results (result :scs (descriptor-reg)))
248 (load-type type function (- fun-pointer-lowtag))
250 (make-ea :byte :base function
251 :disp (- (* simple-fun-code-offset n-word-bytes)
252 fun-pointer-lowtag)))
253 (inst cmp type simple-fun-header-widetag)
254 (inst jmp :e normal-fn)
255 (inst lea raw (make-fixup (extern-alien-name "closure_tramp") :foreign))
257 (storew function fdefn fdefn-fun-slot other-pointer-lowtag)
258 (storew raw fdefn fdefn-raw-addr-slot other-pointer-lowtag)
259 (move result function)))
261 (define-vop (fdefn-makunbound)
263 (:translate fdefn-makunbound)
264 (:args (fdefn :scs (descriptor-reg) :target result))
265 (:results (result :scs (descriptor-reg)))
267 (storew nil-value fdefn fdefn-fun-slot other-pointer-lowtag)
268 (storew (make-fixup (extern-alien-name "undefined_tramp") :foreign)
269 fdefn fdefn-raw-addr-slot other-pointer-lowtag)
270 (move result fdefn)))
272 ;;;; binding and unbinding
274 ;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
275 ;;; the symbol on the binding stack and stuff the new value into the
280 (:args (val :scs (any-reg descriptor-reg))
281 (symbol :scs (descriptor-reg)))
282 (:temporary (:sc unsigned-reg) tls-index temp bsp)
284 (let ((tls-index-valid (gen-label)))
285 (load-tl-symbol-value bsp *binding-stack-pointer*)
286 (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
287 (inst add bsp (* binding-size n-word-bytes))
288 (store-tl-symbol-value bsp *binding-stack-pointer* temp)
290 (inst or tls-index tls-index)
291 (inst jmp :ne tls-index-valid)
292 ;; allocate a new tls-index
293 (load-symbol-value tls-index *free-tls-index*)
294 (inst add tls-index 4) ;XXX surely we can do this more
295 (store-symbol-value tls-index *free-tls-index*) ;succintly
296 (inst sub tls-index 4)
297 (storew tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
298 (emit-label tls-index-valid)
299 (inst fs-segment-prefix)
300 (inst mov temp (make-ea :dword :scale 1 :index tls-index))
301 (storew temp bsp (- binding-value-slot binding-size))
302 (storew symbol bsp (- binding-symbol-slot binding-size))
303 (inst fs-segment-prefix)
304 (inst mov (make-ea :dword :scale 1 :index tls-index) val))))
308 (:args (val :scs (any-reg descriptor-reg))
309 (symbol :scs (descriptor-reg)))
310 (:temporary (:sc unsigned-reg) temp bsp)
312 (load-symbol-value bsp *binding-stack-pointer*)
313 (loadw temp symbol symbol-value-slot other-pointer-lowtag)
314 (inst add bsp (* binding-size n-word-bytes))
315 (store-symbol-value bsp *binding-stack-pointer*)
316 (storew temp bsp (- binding-value-slot binding-size))
317 (storew symbol bsp (- binding-symbol-slot binding-size))
318 (storew val symbol symbol-value-slot other-pointer-lowtag)))
324 (:temporary (:sc unsigned-reg) symbol value bsp tls-index)
326 (load-tl-symbol-value bsp *binding-stack-pointer*)
327 (loadw symbol bsp (- binding-symbol-slot binding-size))
328 (loadw value bsp (- binding-value-slot binding-size))
330 (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
331 (inst fs-segment-prefix)
332 (inst mov (make-ea :dword :scale 1 :index tls-index) value)
334 (storew 0 bsp (- binding-symbol-slot binding-size))
335 (inst sub bsp (* binding-size n-word-bytes))
336 ;; we're done with value, so we can use it as a temp here
337 (store-tl-symbol-value bsp *binding-stack-pointer* value)))
341 (:temporary (:sc unsigned-reg) symbol value bsp)
343 (load-symbol-value bsp *binding-stack-pointer*)
344 (loadw symbol bsp (- binding-symbol-slot binding-size))
345 (loadw value bsp (- binding-value-slot binding-size))
346 (storew value symbol symbol-value-slot other-pointer-lowtag)
347 (storew 0 bsp (- binding-symbol-slot binding-size))
348 (inst sub bsp (* binding-size n-word-bytes))
349 (store-symbol-value bsp *binding-stack-pointer*)))
352 (define-vop (unbind-to-here)
353 (:args (where :scs (descriptor-reg any-reg)))
354 (:temporary (:sc unsigned-reg) symbol value bsp #!+sb-thread tls-index)
356 (load-tl-symbol-value bsp *binding-stack-pointer*)
361 (loadw symbol bsp (- binding-symbol-slot binding-size))
362 (inst or symbol symbol)
364 (loadw value bsp (- binding-value-slot binding-size))
365 #!-sb-thread (storew value symbol symbol-value-slot other-pointer-lowtag)
368 tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
369 #!+sb-thread (inst fs-segment-prefix)
370 #!+sb-thread (inst mov (make-ea :dword :scale 1 :index tls-index) value)
371 (storew 0 bsp (- binding-symbol-slot binding-size))
374 (inst sub bsp (* binding-size n-word-bytes))
377 ;; we're done with value, so can use it as a temporary
378 (store-tl-symbol-value bsp *binding-stack-pointer* value)
384 ;;;; closure indexing
386 (define-full-reffer closure-index-ref *
387 closure-info-offset fun-pointer-lowtag
388 (any-reg descriptor-reg) * %closure-index-ref)
390 (define-full-setter set-funcallable-instance-info *
391 funcallable-instance-info-offset fun-pointer-lowtag
392 (any-reg descriptor-reg) * %set-funcallable-instance-info)
394 (define-full-reffer funcallable-instance-info *
395 funcallable-instance-info-offset fun-pointer-lowtag
396 (descriptor-reg any-reg) * %funcallable-instance-info)
398 (define-vop (funcallable-instance-lexenv cell-ref)
399 (:variant funcallable-instance-lexenv-slot fun-pointer-lowtag))
401 (define-vop (closure-ref slot-ref)
402 (:variant closure-info-offset fun-pointer-lowtag))
404 (define-vop (closure-init slot-set)
405 (:variant closure-info-offset fun-pointer-lowtag))
407 ;;;; value cell hackery
409 (define-vop (value-cell-ref cell-ref)
410 (:variant value-cell-value-slot other-pointer-lowtag))
412 (define-vop (value-cell-set cell-set)
413 (:variant value-cell-value-slot other-pointer-lowtag))
415 ;;;; structure hackery
417 (define-vop (instance-length)
419 (:translate %instance-length)
420 (:args (struct :scs (descriptor-reg)))
421 (:results (res :scs (unsigned-reg)))
422 (:result-types positive-fixnum)
424 (loadw res struct 0 instance-pointer-lowtag)
425 (inst shr res n-widetag-bits)))
427 (define-vop (instance-ref slot-ref)
428 (:variant instance-slots-offset instance-pointer-lowtag)
430 (:translate %instance-ref)
431 (:arg-types instance (:constant index)))
433 (define-vop (instance-set slot-set)
435 (:translate %instance-set)
436 (:variant instance-slots-offset instance-pointer-lowtag)
437 (:arg-types instance (:constant index) *))
439 (define-full-reffer instance-index-ref * instance-slots-offset
440 instance-pointer-lowtag (any-reg descriptor-reg) * %instance-ref)
442 (define-full-setter instance-index-set * instance-slots-offset
443 instance-pointer-lowtag (any-reg descriptor-reg) * %instance-set)
446 (defknown %instance-set-conditional (instance index t t) t
449 (define-vop (instance-set-conditional)
450 (:translate %instance-set-conditional)
451 (:args (object :scs (descriptor-reg) :to :eval)
452 (slot :scs (any-reg) :to :result)
453 (old-value :scs (descriptor-reg any-reg) :target eax)
454 (new-value :scs (descriptor-reg any-reg)))
455 (:arg-types instance positive-fixnum * *)
456 (:temporary (:sc descriptor-reg :offset eax-offset
457 :from (:argument 2) :to :result :target result) eax)
458 (:results (result :scs (descriptor-reg any-reg)))
459 ;(:guard (backend-featurep :i486))
464 (inst cmpxchg (make-ea :dword :base object :index slot :scale 1
465 :disp (- (* instance-slots-offset n-word-bytes)
466 instance-pointer-lowtag))
472 ;;;; code object frobbing
474 (define-full-reffer code-header-ref * 0 other-pointer-lowtag
475 (any-reg descriptor-reg) * code-header-ref)
477 (define-full-setter code-header-set * 0 other-pointer-lowtag
478 (any-reg descriptor-reg) * code-header-set)