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))))
53 ;;;; symbol hacking VOPs
55 ;;; these next two cf the sparc version, by jrd.
56 ;;; FIXME: Deref this ^ reference.
58 ;;; The compiler likes to be able to directly SET symbols.
59 (define-vop (set cell-set)
60 (:variant symbol-value-slot other-pointer-lowtag))
62 ;;; Do a cell ref with an error check for being unbound.
63 (define-vop (checked-cell-ref)
64 (:args (object :scs (descriptor-reg) :target obj-temp))
65 (:results (value :scs (descriptor-reg any-reg)))
68 (:save-p :compute-only)
69 (:temporary (:sc descriptor-reg :from (:argument 0)) obj-temp))
71 ;;; With Symbol-Value, we check that the value isn't the trap object. So
72 ;;; Symbol-Value of NIL is NIL.
73 (define-vop (symbol-value)
74 (:translate symbol-value)
76 (:args (object :scs (descriptor-reg) :to (:result 1)))
77 (:results (value :scs (descriptor-reg any-reg)))
79 (:save-p :compute-only)
81 (let ((err-lab (generate-error-code vop unbound-symbol-error object)))
82 (loadw value object symbol-value-slot other-pointer-lowtag)
83 (inst cmp value unbound-marker-widetag)
84 (inst jmp :e err-lab))))
86 (define-vop (fast-symbol-value cell-ref)
87 (:variant symbol-value-slot other-pointer-lowtag)
89 (:translate symbol-value))
91 (defknown fast-symbol-value-xadd (symbol fixnum) fixnum ())
92 (define-vop (fast-symbol-value-xadd cell-xadd)
93 (:variant symbol-value-slot other-pointer-lowtag)
95 (:translate fast-symbol-value-xadd)
96 (:arg-types * tagged-num))
101 (:args (object :scs (descriptor-reg)))
104 (:temporary (:sc descriptor-reg :from (:argument 0)) value)
106 (loadw value object symbol-value-slot other-pointer-lowtag)
107 (inst cmp value unbound-marker-widetag)
108 (inst jmp (if not-p :e :ne) target)))
110 (define-vop (symbol-hash)
112 (:translate symbol-hash)
113 (:args (symbol :scs (descriptor-reg)))
114 (:results (res :scs (any-reg)))
115 (:result-types positive-fixnum)
117 ;; The symbol-hash slot of NIL holds NIL because it is also the
118 ;; cdr slot, so we have to strip off the two low bits to make sure
121 ;; FIXME: Is this still true? It seems to me from my reading of
122 ;; the DEFINE-PRIMITIVE-OBJECT in objdef.lisp that the symbol-hash
123 ;; is the second slot, and offset 0 = tags and stuff (and CAR slot in
124 ;; a CONS), offset 1 = value slot (and CDR slot in a CONS), and
125 ;; offset 2 = hash slot.
126 (loadw res symbol symbol-hash-slot other-pointer-lowtag)
127 (inst and res (lognot #b11))))
129 ;;;; fdefinition (FDEFN) objects
131 (define-vop (fdefn-fun cell-ref) ; /pfw - alpha
132 (:variant fdefn-fun-slot other-pointer-lowtag))
134 (define-vop (safe-fdefn-fun)
135 (:args (object :scs (descriptor-reg) :to (:result 1)))
136 (:results (value :scs (descriptor-reg any-reg)))
138 (:save-p :compute-only)
140 (loadw value object fdefn-fun-slot other-pointer-lowtag)
141 (inst cmp value nil-value)
142 (let ((err-lab (generate-error-code vop undefined-fun-error object)))
143 (inst jmp :e err-lab))))
145 (define-vop (set-fdefn-fun)
147 (:translate (setf fdefn-fun))
148 (:args (function :scs (descriptor-reg) :target result)
149 (fdefn :scs (descriptor-reg)))
150 (:temporary (:sc unsigned-reg) raw)
151 (:temporary (:sc byte-reg) type)
152 (:results (result :scs (descriptor-reg)))
154 (load-type type function (- fun-pointer-lowtag))
156 (make-ea :byte :base function
157 :disp (- (* simple-fun-code-offset n-word-bytes)
158 fun-pointer-lowtag)))
159 (inst cmp type simple-fun-header-widetag)
160 (inst jmp :e normal-fn)
161 (inst lea raw (make-fixup (extern-alien-name "closure_tramp") :foreign))
163 (storew function fdefn fdefn-fun-slot other-pointer-lowtag)
164 (storew raw fdefn fdefn-raw-addr-slot other-pointer-lowtag)
165 (move result function)))
167 (define-vop (fdefn-makunbound)
169 (:translate fdefn-makunbound)
170 (:args (fdefn :scs (descriptor-reg) :target result))
171 (:results (result :scs (descriptor-reg)))
173 (storew nil-value fdefn fdefn-fun-slot other-pointer-lowtag)
174 (storew (make-fixup (extern-alien-name "undefined_tramp") :foreign)
175 fdefn fdefn-raw-addr-slot other-pointer-lowtag)
176 (move result fdefn)))
178 ;;;; binding and unbinding
180 ;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
181 ;;; the symbol on the binding stack and stuff the new value into the
185 (:args (val :scs (any-reg descriptor-reg))
186 (symbol :scs (descriptor-reg)))
187 (:temporary (:sc unsigned-reg) temp bsp)
189 (load-symbol-value bsp *binding-stack-pointer*)
190 (loadw temp symbol symbol-value-slot other-pointer-lowtag)
191 (inst add bsp (* binding-size n-word-bytes))
192 (store-symbol-value bsp *binding-stack-pointer*)
193 (storew temp bsp (- binding-value-slot binding-size))
194 (storew symbol bsp (- binding-symbol-slot binding-size))
195 (storew val symbol symbol-value-slot other-pointer-lowtag)))
198 (:temporary (:sc unsigned-reg) symbol value bsp)
200 (load-symbol-value bsp *binding-stack-pointer*)
201 (loadw symbol bsp (- binding-symbol-slot binding-size))
202 (loadw value bsp (- binding-value-slot binding-size))
203 (storew value symbol symbol-value-slot other-pointer-lowtag)
204 (storew 0 bsp (- binding-symbol-slot binding-size))
205 (inst sub bsp (* binding-size n-word-bytes))
206 (store-symbol-value bsp *binding-stack-pointer*)))
208 (define-vop (unbind-to-here)
209 (:args (where :scs (descriptor-reg any-reg)))
210 (:temporary (:sc unsigned-reg) symbol value bsp)
212 (load-symbol-value bsp *binding-stack-pointer*)
217 (loadw symbol bsp (- binding-symbol-slot binding-size))
218 (inst or symbol symbol)
220 (loadw value bsp (- binding-value-slot binding-size))
221 (storew value symbol symbol-value-slot other-pointer-lowtag)
222 (storew 0 bsp (- binding-symbol-slot binding-size))
225 (inst sub bsp (* binding-size n-word-bytes))
228 (store-symbol-value bsp *binding-stack-pointer*)
232 ;;;; closure indexing
234 (define-full-reffer closure-index-ref *
235 closure-info-offset fun-pointer-lowtag
236 (any-reg descriptor-reg) * %closure-index-ref)
238 (define-full-setter set-funcallable-instance-info *
239 funcallable-instance-info-offset fun-pointer-lowtag
240 (any-reg descriptor-reg) * %set-funcallable-instance-info)
242 (define-full-reffer funcallable-instance-info *
243 funcallable-instance-info-offset fun-pointer-lowtag
244 (descriptor-reg any-reg) * %funcallable-instance-info)
246 (define-vop (funcallable-instance-lexenv cell-ref)
247 (:variant funcallable-instance-lexenv-slot fun-pointer-lowtag))
249 (define-vop (closure-ref slot-ref)
250 (:variant closure-info-offset fun-pointer-lowtag))
252 (define-vop (closure-init slot-set)
253 (:variant closure-info-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 ;;;; structure hackery
265 (define-vop (instance-length)
267 (:translate %instance-length)
268 (:args (struct :scs (descriptor-reg)))
269 (:results (res :scs (unsigned-reg)))
270 (:result-types positive-fixnum)
272 (loadw res struct 0 instance-pointer-lowtag)
273 (inst shr res n-widetag-bits)))
275 (define-vop (instance-ref slot-ref)
276 (:variant instance-slots-offset instance-pointer-lowtag)
278 (:translate %instance-ref)
279 (:arg-types instance (:constant index)))
281 (define-vop (instance-set slot-set)
283 (:translate %instance-set)
284 (:variant instance-slots-offset instance-pointer-lowtag)
285 (:arg-types instance (:constant index) *))
287 (define-full-reffer instance-index-ref * instance-slots-offset
288 instance-pointer-lowtag (any-reg descriptor-reg) * %instance-ref)
290 (define-full-setter instance-index-set * instance-slots-offset
291 instance-pointer-lowtag (any-reg descriptor-reg) * %instance-set)
293 ;;;; code object frobbing
295 (define-full-reffer code-header-ref * 0 other-pointer-lowtag
296 (any-reg descriptor-reg) * code-header-ref)
298 (define-full-setter code-header-set * 0 other-pointer-lowtag
299 (any-reg descriptor-reg) * code-header-set)