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 null zero)))
28 (:info name offset lowtag #!+gengc remember)
34 (storew-and-remember-slot value object offset lowtag)
35 (storew value object offset lowtag))
37 (storew value object offset lowtag)))
39 ;;;; symbol hacking VOPs
41 ;;; The compiler likes to be able to directly SET symbols.
42 (define-vop (set cell-set)
43 (:variant symbol-value-slot other-pointer-lowtag))
45 ;;; Do a cell ref with an error check for being unbound.
46 (define-vop (checked-cell-ref)
47 (:args (object :scs (descriptor-reg) :target obj-temp))
48 (:results (value :scs (descriptor-reg any-reg)))
51 (:save-p :compute-only)
52 (:temporary (:scs (non-descriptor-reg)) temp)
53 (:temporary (:scs (descriptor-reg) :from (:argument 0)) obj-temp))
55 ;;; With SYMBOL-VALUE, we check that the value isn't the trap object.
56 ;;; So SYMBOL-VALUE of NIL is NIL.
57 (define-vop (symbol-value checked-cell-ref)
58 (:translate symbol-value)
60 (move object obj-temp)
61 (loadw value obj-temp symbol-value-slot other-pointer-lowtag)
62 (let ((err-lab (generate-error-code vop unbound-symbol-error obj-temp)))
63 (inst xor value unbound-marker-widetag temp)
64 (inst beq temp err-lab))))
66 ;;; like CHECKED-CELL-REF, only we are a predicate to see if the cell
68 (define-vop (boundp-frob)
69 (:args (object :scs (descriptor-reg)))
73 (:temporary (:scs (descriptor-reg)) value)
74 (:temporary (:scs (non-descriptor-reg)) temp))
76 (define-vop (boundp boundp-frob)
79 (loadw value object symbol-value-slot other-pointer-lowtag)
80 (inst xor value unbound-marker-widetag temp)
82 (inst beq temp target)
83 (inst bne temp target))))
85 (define-vop (fast-symbol-value cell-ref)
86 (:variant symbol-value-slot other-pointer-lowtag)
88 (:translate symbol-value))
90 ;;;; fdefinition (FDEFN) objects
92 (define-vop (fdefn-fun cell-ref)
93 (:variant fdefn-fun-slot other-pointer-lowtag))
95 (define-vop (safe-fdefn-fun)
96 (:args (object :scs (descriptor-reg) :target obj-temp))
97 (:results (value :scs (descriptor-reg any-reg)))
99 (:save-p :compute-only)
100 (:temporary (:scs (descriptor-reg) :from (:argument 0)) obj-temp)
101 (:temporary (:scs (non-descriptor-reg)) temp)
103 (move object obj-temp)
104 (loadw value obj-temp fdefn-fun-slot other-pointer-lowtag)
105 (let ((err-lab (generate-error-code vop undefined-fun-error obj-temp)))
106 (inst cmpeq value null-tn temp)
107 (inst bne temp err-lab))))
109 (define-vop (set-fdefn-fun)
111 (:translate (setf fdefn-fun))
112 (:args (function :scs (descriptor-reg) :target result)
113 (fdefn :scs (descriptor-reg)))
114 (:temporary (:scs (interior-reg)) lip)
115 (:temporary (:scs (non-descriptor-reg)) type)
116 (:results (result :scs (descriptor-reg)))
118 (let ((normal-fn (gen-label)))
119 (load-type type function (- fun-pointer-lowtag))
120 (inst xor type simple-fun-header-widetag type)
122 (- (ash simple-fun-code-offset word-shift) fun-pointer-lowtag)
124 (inst beq type normal-fn)
125 (inst li (make-fixup "closure_tramp" :foreign) lip)
126 (emit-label normal-fn)
127 (storew lip fdefn fdefn-raw-addr-slot other-pointer-lowtag)
128 (storew function fdefn fdefn-fun-slot other-pointer-lowtag)
129 (move function result))))
132 (define-vop (fdefn-makunbound)
134 (:translate fdefn-makunbound)
135 (:args (fdefn :scs (descriptor-reg) :target result))
136 (:temporary (:scs (non-descriptor-reg)) temp)
137 (:results (result :scs (descriptor-reg)))
139 (storew null-tn fdefn fdefn-fun-slot other-pointer-lowtag)
140 (inst li (make-fixup "undefined_tramp" :foreign) temp)
142 (storew temp fdefn fdefn-raw-addr-slot other-pointer-lowtag)))
144 ;;;; binding and Unbinding
146 ;;; Establish VAL as a binding for SYMBOL. Save the old value and the
147 ;;; symbol on the binding stack and stuff the new value into the symbol.
149 (:args (val :scs (any-reg descriptor-reg))
150 (symbol :scs (descriptor-reg)))
151 (:temporary (:scs (descriptor-reg)) temp)
153 (loadw temp symbol symbol-value-slot other-pointer-lowtag)
154 (inst addq bsp-tn (* 2 n-word-bytes) bsp-tn)
155 (storew temp bsp-tn (- binding-value-slot binding-size))
156 (storew symbol bsp-tn (- binding-symbol-slot binding-size))
157 (#!+gengc storew-and-remember-slot #!-gengc storew
158 val symbol symbol-value-slot other-pointer-lowtag)))
162 (:temporary (:scs (descriptor-reg)) symbol value)
164 (loadw symbol bsp-tn (- binding-symbol-slot binding-size))
165 (loadw value bsp-tn (- binding-value-slot binding-size))
166 (#!+gengc storew-and-remember-slot #!-gengc storew
167 value symbol symbol-value-slot other-pointer-lowtag)
168 (storew zero-tn bsp-tn (- binding-symbol-slot binding-size))
169 (inst subq bsp-tn (* 2 n-word-bytes) bsp-tn)))
172 (define-vop (unbind-to-here)
173 (:args (arg :scs (descriptor-reg any-reg) :target where))
174 (:temporary (:scs (any-reg) :from (:argument 0)) where)
175 (:temporary (:scs (descriptor-reg)) symbol value)
176 (:temporary (:scs (non-descriptor-reg)) temp)
178 (let ((loop (gen-label))
182 (inst cmpeq where bsp-tn temp)
186 (loadw symbol bsp-tn (- binding-symbol-slot binding-size))
187 (loadw value bsp-tn (- binding-value-slot binding-size))
188 (inst beq symbol skip)
189 (#!+gengc storew-and-remember-slot #!-gengc storew
190 value symbol symbol-value-slot other-pointer-lowtag)
191 (storew zero-tn bsp-tn (- binding-symbol-slot binding-size))
194 (inst subq bsp-tn (* 2 n-word-bytes) bsp-tn)
195 (inst cmpeq where bsp-tn temp)
200 ;;;; closure indexing
202 (define-full-reffer closure-index-ref *
203 closure-info-offset fun-pointer-lowtag
204 (descriptor-reg any-reg) * %closure-index-ref)
206 (define-full-setter set-funcallable-instance-info *
207 funcallable-instance-info-offset fun-pointer-lowtag
208 (descriptor-reg any-reg null zero) * %set-funcallable-instance-info)
210 (define-full-reffer funcallable-instance-info *
211 funcallable-instance-info-offset fun-pointer-lowtag
212 (descriptor-reg any-reg) * %funcallable-instance-info)
214 (define-vop (funcallable-instance-lexenv cell-ref)
215 (:variant funcallable-instance-lexenv-slot fun-pointer-lowtag))
217 (define-vop (closure-ref slot-ref)
218 (:variant closure-info-offset fun-pointer-lowtag))
220 (define-vop (closure-init slot-set)
221 (:variant closure-info-offset fun-pointer-lowtag))
223 ;;;; value cell hackery
225 (define-vop (value-cell-ref cell-ref)
226 (:variant value-cell-value-slot other-pointer-lowtag))
228 (define-vop (value-cell-set cell-set)
229 (:variant value-cell-value-slot other-pointer-lowtag))
231 ;;;; instance hackery
233 (define-vop (instance-length)
235 (:translate %instance-length)
236 (:args (struct :scs (descriptor-reg)))
237 (:results (res :scs (unsigned-reg)))
238 (:result-types positive-fixnum)
240 (loadw res struct 0 instance-pointer-lowtag)
241 (inst srl res n-widetag-bits res)))
243 (define-vop (instance-ref slot-ref)
244 (:variant instance-slots-offset instance-pointer-lowtag)
246 (:translate %instance-ref)
247 (:arg-types instance (:constant index)))
249 (define-vop (instance-set slot-set)
251 (:translate %instance-set)
252 (:variant instance-slots-offset instance-pointer-lowtag)
253 (:arg-types instance (:constant index) *))
255 (define-full-reffer instance-index-ref * instance-slots-offset
256 instance-pointer-lowtag (descriptor-reg any-reg) * %instance-ref)
258 (define-full-setter instance-index-set * instance-slots-offset
259 instance-pointer-lowtag (descriptor-reg any-reg null zero) * %instance-set)
261 ;;;; code object frobbing
263 (define-full-reffer code-header-ref * 0 other-pointer-lowtag
264 (descriptor-reg any-reg) * code-header-ref)
266 (define-full-setter code-header-set * 0 other-pointer-lowtag
267 (descriptor-reg any-reg null zero) * code-header-set)
269 ;;;; mutator accessing
274 (eval-when (:compile-toplevel :load-toplevel :execute)
275 ;; SBCL has never had GENGC. Now that we have Alpha support, it
276 ;; would probably be nice to restore GENGC support so that the Alpha
277 ;; doesn't have to crawl along with stop'n'copy. When we do, the CMU
278 ;; CL code below will need updating to the SBCL way of looking at
279 ;; things, e.g. at least using "SB-KERNEL" or "SB!KERNEL" instead of
280 ;; :KERNEL. -- WHN 2001-05-08
281 (error "This code is stale as of sbcl-0.6.12."))
283 (define-vop (mutator-ub32-ref)
286 (:results (res :scs (unsigned-reg)))
287 (:result-types unsigned-num)
290 (loadw res mutator-tn slot)))
292 (define-vop (mutator-descriptor-ref mutator-ub32-ref)
293 (:results (res :scs (any-reg descriptor-reg)))
296 (define-vop (mutator-sap-ref mutator-ub32-ref)
297 (:results (res :scs (sap-reg)))
298 (:result-types system-area-pointer))
301 (define-vop (mutator-ub32-set)
303 (:args (arg :scs (unsigned-reg) :target res))
304 (:arg-types unsigned-num)
305 (:results (res :scs (unsigned-reg)))
306 (:result-types unsigned-num)
309 (storew arg mutator-tn slot)
312 (define-vop (mutator-descriptor-set mutator-ub32-set)
313 (:args (arg :scs (any-reg descriptor-reg null zero) :target res))
315 (:results (res :scs (any-reg descriptor-reg)))
318 (define-vop (mutator-sap-set mutator-ub32-set)
319 (:args (arg :scs (sap-reg) :target res))
320 (:arg-types system-area-pointer)
321 (:results (res :scs (sap-reg)))
322 (:result-types system-area-pointer))
325 (macrolet ((define-mutator-accessors (slot type writable)
326 (let ((ref (symbolicate "MUTATOR-" slot "-REF"))
327 (set (and writable (symbolicate "MUTATOR-" slot "-SET")))
328 (offset (symbolicate "MUTATOR-" slot "-SLOT"))
330 (let ((*package* (find-package :kernel)))
331 (symbolicate "MUTATOR-" slot))))
333 (lisp-type ref-vop set-vop)
337 'mutator-descriptor-ref
338 'mutator-descriptor-set))
340 (values '(unsigned-byte 32)
344 (values 'system-area-pointer
348 (export ',fn :kernel)
349 (defknown ,fn () ,lisp-type (flushable))
350 (define-vop (,ref ,ref-vop)
354 `((defknown ((setf ,fn)) (,lisp-type) ,lisp-type
356 (define-vop (,set ,set-vop)
357 (:translate (setf ,fn))
358 (:variant ,offset)))))))))
359 (define-mutator-accessors thread :des t)
360 (define-mutator-accessors suspends-disabled-count :ub32 t)
361 (define-mutator-accessors suspend-pending :ub32 t)
362 (define-mutator-accessors control-stack-base :sap nil)
363 (define-mutator-accessors control-stack-end :sap nil)
364 (define-mutator-accessors current-unwind-protect :sap nil)
365 (define-mutator-accessors current-catch-block :sap nil)
366 (define-mutator-accessors binding-stack-base :sap nil)
367 (define-mutator-accessors binding-stack-end :sap nil)
368 (define-mutator-accessors number-stack-base :sap nil)
369 (define-mutator-accessors number-stack-end :sap nil)
370 (define-mutator-accessors nursery-start :sap nil)
371 (define-mutator-accessors nursery-end :sap nil)
372 (define-mutator-accessors storebuf-start :sap nil)
373 (define-mutator-accessors storebuf-end :sap nil)
374 (define-mutator-accessors words-consed :ub32 nil))