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)))
35 ;;;; Symbol hacking VOPs:
37 ;;; The compiler likes to be able to directly SET symbols.
38 (define-vop (set cell-set)
39 (:variant symbol-value-slot other-pointer-lowtag))
41 ;;; Do a cell ref with an error check for being unbound.
42 (define-vop (checked-cell-ref)
43 (:args (object :scs (descriptor-reg) :target obj-temp))
44 (:results (value :scs (descriptor-reg any-reg)))
47 (:save-p :compute-only)
48 (:temporary (:scs (descriptor-reg) :from (:argument 0)) obj-temp))
50 ;;; With SYMBOL-VALUE, we check that the value isn't the trap object.
51 ;;; So SYMBOL-VALUE of NIL is NIL.
52 (define-vop (symbol-value checked-cell-ref)
53 (:translate symbol-value)
55 (move obj-temp object)
56 (loadw value obj-temp symbol-value-slot other-pointer-lowtag)
57 (let ((err-lab (generate-error-code vop unbound-symbol-error obj-temp)))
58 (inst cmpwi value unbound-marker-widetag)
61 ;;; Like CHECKED-CELL-REF, only we are a predicate to see if the cell
63 (define-vop (boundp-frob)
64 (:args (object :scs (descriptor-reg)))
68 (:temporary (:scs (descriptor-reg)) value))
70 (define-vop (boundp boundp-frob)
73 (loadw value object symbol-value-slot other-pointer-lowtag)
74 (inst cmpwi value unbound-marker-widetag)
75 (inst b? (if not-p :eq :ne) target)))
77 (define-vop (fast-symbol-value cell-ref)
78 (:variant symbol-value-slot other-pointer-lowtag)
80 (:translate symbol-value))
82 (define-vop (symbol-hash)
84 (:translate symbol-hash)
85 (:args (symbol :scs (descriptor-reg)))
86 (:results (res :scs (any-reg)))
87 (:result-types positive-fixnum)
89 ;; The symbol-hash slot of NIL holds NIL because it is also the
90 ;; cdr slot, so we have to strip off the two low bits to make sure
91 ;; it is a fixnum. The lowtag selection magic that is required to
92 ;; ensure this is explained in the comment in objdef.lisp
93 (loadw res symbol symbol-hash-slot other-pointer-lowtag)
94 (inst clrrwi res res (1- n-lowtag-bits))))
96 ;;;; Fdefinition (fdefn) objects.
98 (define-vop (fdefn-fun cell-ref)
99 (:variant fdefn-fun-slot other-pointer-lowtag))
101 (define-vop (safe-fdefn-fun)
102 (:args (object :scs (descriptor-reg) :target obj-temp))
103 (:results (value :scs (descriptor-reg any-reg)))
105 (:save-p :compute-only)
106 (:temporary (:scs (descriptor-reg) :from (:argument 0)) obj-temp)
108 (move obj-temp object)
109 (loadw value obj-temp fdefn-fun-slot other-pointer-lowtag)
110 (inst cmpw value null-tn)
111 (let ((err-lab (generate-error-code vop undefined-fun-error obj-temp)))
112 (inst beq err-lab))))
114 (define-vop (set-fdefn-fun)
116 (:translate (setf fdefn-fun))
117 (:args (function :scs (descriptor-reg) :target result)
118 (fdefn :scs (descriptor-reg)))
119 (:temporary (:scs (interior-reg)) lip)
120 (:temporary (:scs (non-descriptor-reg)) type)
121 (:results (result :scs (descriptor-reg)))
123 (let ((normal-fn (gen-label)))
124 (load-type type function (- fun-pointer-lowtag))
125 (inst cmpwi type simple-fun-header-widetag)
126 ;;(inst mr lip function)
127 (inst addi lip function
128 (- (ash simple-fun-code-offset word-shift) fun-pointer-lowtag))
130 (inst lr lip (make-fixup (extern-alien-name "closure_tramp") :foreign))
131 (emit-label normal-fn)
132 (storew lip fdefn fdefn-raw-addr-slot other-pointer-lowtag)
133 (storew function fdefn fdefn-fun-slot other-pointer-lowtag)
134 (move result function))))
136 (define-vop (fdefn-makunbound)
138 (:translate fdefn-makunbound)
139 (:args (fdefn :scs (descriptor-reg) :target result))
140 (:temporary (:scs (non-descriptor-reg)) temp)
141 (:results (result :scs (descriptor-reg)))
143 (storew null-tn fdefn fdefn-fun-slot other-pointer-lowtag)
144 (inst lr temp (make-fixup (extern-alien-name "undefined_tramp") :foreign))
145 (storew temp fdefn fdefn-raw-addr-slot other-pointer-lowtag)
146 (move result fdefn)))
150 ;;;; Binding and Unbinding.
152 ;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
153 ;;; the symbol on the binding stack and stuff the new value into the
157 (:args (val :scs (any-reg descriptor-reg))
158 (symbol :scs (descriptor-reg)))
159 (:temporary (:scs (descriptor-reg)) temp)
161 (loadw temp symbol symbol-value-slot other-pointer-lowtag)
162 (inst addi bsp-tn bsp-tn (* 2 n-word-bytes))
163 (storew temp bsp-tn (- binding-value-slot binding-size))
164 (storew symbol bsp-tn (- binding-symbol-slot binding-size))
165 (storew val symbol symbol-value-slot other-pointer-lowtag)))
169 (:temporary (:scs (descriptor-reg)) symbol value)
171 (loadw symbol bsp-tn (- binding-symbol-slot binding-size))
172 (loadw value bsp-tn (- binding-value-slot binding-size))
173 (storew value symbol symbol-value-slot other-pointer-lowtag)
174 (storew zero-tn bsp-tn (- binding-symbol-slot binding-size))
175 (inst subi bsp-tn bsp-tn (* 2 n-word-bytes))))
178 (define-vop (unbind-to-here)
179 (:args (arg :scs (descriptor-reg any-reg) :target where))
180 (:temporary (:scs (any-reg) :from (:argument 0)) where)
181 (:temporary (:scs (descriptor-reg)) symbol value)
183 (let ((loop (gen-label))
187 (inst cmpw where bsp-tn)
191 (loadw symbol bsp-tn (- binding-symbol-slot binding-size))
192 (inst cmpwi symbol 0)
194 (loadw value bsp-tn (- binding-value-slot binding-size))
195 (storew value symbol symbol-value-slot other-pointer-lowtag)
196 (storew zero-tn bsp-tn (- binding-symbol-slot binding-size))
199 (inst subi bsp-tn bsp-tn (* 2 n-word-bytes))
200 (inst cmpw where bsp-tn)
207 ;;;; Closure indexing.
209 (define-vop (closure-index-ref word-index-ref)
210 (:variant closure-info-offset fun-pointer-lowtag)
211 (:translate %closure-index-ref))
213 (define-vop (funcallable-instance-info word-index-ref)
214 (:variant funcallable-instance-info-offset fun-pointer-lowtag)
215 (:translate %funcallable-instance-info))
217 (define-vop (set-funcallable-instance-info word-index-set)
218 (:variant funcallable-instance-info-offset fun-pointer-lowtag)
219 (:translate %set-funcallable-instance-info))
221 (define-vop (funcallable-instance-lexenv cell-ref)
222 (:variant funcallable-instance-lexenv-slot fun-pointer-lowtag))
225 (define-vop (closure-ref slot-ref)
226 (:variant closure-info-offset fun-pointer-lowtag))
228 (define-vop (closure-init slot-set)
229 (:variant closure-info-offset fun-pointer-lowtag))
232 ;;;; Value Cell hackery.
234 (define-vop (value-cell-ref cell-ref)
235 (:variant value-cell-value-slot other-pointer-lowtag))
237 (define-vop (value-cell-set cell-set)
238 (:variant value-cell-value-slot other-pointer-lowtag))
242 ;;;; Instance hackery:
244 (define-vop (instance-length)
246 (:translate %instance-length)
247 (:args (struct :scs (descriptor-reg)))
248 (:temporary (:scs (non-descriptor-reg)) temp)
249 (:results (res :scs (unsigned-reg)))
250 (:result-types positive-fixnum)
252 (loadw temp struct 0 instance-pointer-lowtag)
253 (inst srwi res temp n-widetag-bits)))
255 (define-vop (instance-ref slot-ref)
256 (:variant instance-slots-offset instance-pointer-lowtag)
258 (:translate %instance-ref)
259 (:arg-types * (:constant index)))
262 (define-vop (instance-set slot-set)
264 (:translate %instance-set)
265 (:variant instance-slots-offset instance-pointer-lowtag)
266 (:arg-types instance (:constant index) *))
268 (define-vop (instance-index-ref word-index-ref)
270 (:translate %instance-ref)
271 (:variant instance-slots-offset instance-pointer-lowtag)
272 (:arg-types instance positive-fixnum))
274 (define-vop (instance-index-set word-index-set)
276 (:translate %instance-set)
277 (:variant instance-slots-offset instance-pointer-lowtag)
278 (:arg-types instance positive-fixnum *))
283 ;;;; Code object frobbing.
285 (define-vop (code-header-ref word-index-ref)
286 (:translate code-header-ref)
288 (:variant 0 other-pointer-lowtag))
290 (define-vop (code-header-set word-index-set)
291 (:translate code-header-set)
293 (:variant 0 other-pointer-lowtag))