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.
16 ;;;; Data object ref/set stuff.
19 (:args (object :scs (descriptor-reg)))
20 (:info name offset lowtag)
22 (:results (result :scs (descriptor-reg any-reg)))
24 (loadw result object offset lowtag)))
26 (define-vop (set-slot)
27 (:args (object :scs (descriptor-reg))
28 (value :scs (descriptor-reg any-reg)))
29 (:info name offset lowtag)
33 (storew value object offset lowtag)))
37 ;;;; Symbol hacking VOPs:
39 ;;; The compiler likes to be able to directly SET symbols.
41 (define-vop (set cell-set)
42 (:variant symbol-value-slot other-pointer-lowtag))
44 ;;; 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 (descriptor-reg) :from (:argument 0)) obj-temp))
54 ;;; With Symbol-Value, we check that the value isn't the trap object. So
55 ;;; Symbol-Value of NIL is NIL.
57 (define-vop (symbol-value checked-cell-ref)
58 (:translate symbol-value)
60 (move obj-temp object)
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 cmpwi value unbound-marker-widetag)
66 ;;; Like CHECKED-CELL-REF, only we are a predicate to see if the cell is bound.
67 (define-vop (boundp-frob)
68 (:args (object :scs (descriptor-reg)))
72 (:temporary (:scs (descriptor-reg)) value))
74 (define-vop (boundp boundp-frob)
77 (loadw value object symbol-value-slot other-pointer-lowtag)
78 (inst cmpwi value unbound-marker-widetag)
79 (inst b? (if not-p :eq :ne) target)))
81 (define-vop (fast-symbol-value cell-ref)
82 (:variant symbol-value-slot other-pointer-lowtag)
84 (:translate symbol-value))
87 ;;;; Fdefinition (fdefn) objects.
89 (define-vop (fdefn-fun cell-ref)
90 (:variant fdefn-fun-slot other-pointer-lowtag))
92 (define-vop (safe-fdefn-fun)
93 (:args (object :scs (descriptor-reg) :target obj-temp))
94 (:results (value :scs (descriptor-reg any-reg)))
96 (:save-p :compute-only)
97 (:temporary (:scs (descriptor-reg) :from (:argument 0)) obj-temp)
99 (move obj-temp object)
100 (loadw value obj-temp fdefn-fun-slot other-pointer-lowtag)
101 (inst cmpw value null-tn)
102 (let ((err-lab (generate-error-code vop undefined-fun-error obj-temp)))
103 (inst beq err-lab))))
105 (define-vop (set-fdefn-fun)
107 (:translate (setf fdefn-fun))
108 (:args (function :scs (descriptor-reg) :target result)
109 (fdefn :scs (descriptor-reg)))
110 (:temporary (:scs (interior-reg)) lip)
111 (:temporary (:scs (non-descriptor-reg)) type)
112 (:results (result :scs (descriptor-reg)))
114 (let ((normal-fn (gen-label)))
115 (load-type type function (- fun-pointer-lowtag))
116 (inst cmpwi type simple-fun-header-widetag)
117 ;;(inst mr lip function)
118 (inst addi lip function
119 (- (ash simple-fun-code-offset word-shift) fun-pointer-lowtag))
121 (inst lr lip (make-fixup (extern-alien-name "closure_tramp") :foreign))
122 (emit-label normal-fn)
123 (storew lip fdefn fdefn-raw-addr-slot other-pointer-lowtag)
124 (storew function fdefn fdefn-fun-slot other-pointer-lowtag)
125 (move result function))))
127 (define-vop (fdefn-makunbound)
129 (:translate fdefn-makunbound)
130 (:args (fdefn :scs (descriptor-reg) :target result))
131 (:temporary (:scs (non-descriptor-reg)) temp)
132 (:results (result :scs (descriptor-reg)))
134 (storew null-tn fdefn fdefn-fun-slot other-pointer-lowtag)
135 (inst lr temp (make-fixup (extern-alien-name "undefined_tramp") :foreign))
136 (storew temp fdefn fdefn-raw-addr-slot other-pointer-lowtag)
137 (move result fdefn)))
141 ;;;; Binding and Unbinding.
143 ;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
144 ;;; the symbol on the binding stack and stuff the new value into the
148 (:args (val :scs (any-reg descriptor-reg))
149 (symbol :scs (descriptor-reg)))
150 (:temporary (:scs (descriptor-reg)) temp)
152 (loadw temp symbol symbol-value-slot other-pointer-lowtag)
153 (inst addi bsp-tn bsp-tn (* 2 n-word-bytes))
154 (storew temp bsp-tn (- binding-value-slot binding-size))
155 (storew symbol bsp-tn (- binding-symbol-slot binding-size))
156 (storew val symbol symbol-value-slot other-pointer-lowtag)))
160 (:temporary (:scs (descriptor-reg)) symbol value)
162 (loadw symbol bsp-tn (- binding-symbol-slot binding-size))
163 (loadw value bsp-tn (- binding-value-slot binding-size))
164 (storew value symbol symbol-value-slot other-pointer-lowtag)
165 (storew zero-tn bsp-tn (- binding-symbol-slot binding-size))
166 (inst subi bsp-tn bsp-tn (* 2 n-word-bytes))))
169 (define-vop (unbind-to-here)
170 (:args (arg :scs (descriptor-reg any-reg) :target where))
171 (:temporary (:scs (any-reg) :from (:argument 0)) where)
172 (:temporary (:scs (descriptor-reg)) symbol value)
174 (let ((loop (gen-label))
178 (inst cmpw where bsp-tn)
182 (loadw symbol bsp-tn (- binding-symbol-slot binding-size))
183 (inst cmpwi symbol 0)
185 (loadw value bsp-tn (- binding-value-slot binding-size))
186 (storew value symbol symbol-value-slot other-pointer-lowtag)
187 (storew zero-tn bsp-tn (- binding-symbol-slot binding-size))
190 (inst subi bsp-tn bsp-tn (* 2 n-word-bytes))
191 (inst cmpw where bsp-tn)
198 ;;;; Closure indexing.
200 (define-vop (closure-index-ref word-index-ref)
201 (:variant closure-info-offset fun-pointer-lowtag)
202 (:translate %closure-index-ref))
204 (define-vop (funcallable-instance-info word-index-ref)
205 (:variant funcallable-instance-info-offset fun-pointer-lowtag)
206 (:translate %funcallable-instance-info))
208 (define-vop (set-funcallable-instance-info word-index-set)
209 (:variant funcallable-instance-info-offset fun-pointer-lowtag)
210 (:translate %set-funcallable-instance-info))
212 (define-vop (funcallable-instance-lexenv cell-ref)
213 (:variant funcallable-instance-lexenv-slot fun-pointer-lowtag))
216 (define-vop (closure-ref slot-ref)
217 (:variant closure-info-offset fun-pointer-lowtag))
219 (define-vop (closure-init slot-set)
220 (: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))
233 ;;;; Instance hackery:
235 (define-vop (instance-length)
237 (:translate %instance-length)
238 (:args (struct :scs (descriptor-reg)))
239 (:temporary (:scs (non-descriptor-reg)) temp)
240 (:results (res :scs (unsigned-reg)))
241 (:result-types positive-fixnum)
243 (loadw temp struct 0 instance-pointer-lowtag)
244 (inst srwi res temp n-widetag-bits)))
246 (define-vop (instance-ref slot-ref)
247 (:variant instance-slots-offset instance-pointer-lowtag)
249 (:translate %instance-ref)
250 (:arg-types * (:constant index)))
253 (define-vop (instance-set slot-set)
255 (:translate %instance-set)
256 (:variant instance-slots-offset instance-pointer-lowtag)
257 (:arg-types instance (:constant index) *))
259 (define-vop (instance-index-ref word-index-ref)
261 (:translate %instance-ref)
262 (:variant instance-slots-offset instance-pointer-lowtag)
263 (:arg-types instance positive-fixnum))
265 (define-vop (instance-index-set word-index-set)
267 (:translate %instance-set)
268 (:variant instance-slots-offset instance-pointer-lowtag)
269 (:arg-types instance positive-fixnum *))
274 ;;;; Code object frobbing.
276 (define-vop (code-header-ref word-index-ref)
277 (:translate code-header-ref)
279 (:variant 0 other-pointer-lowtag))
281 (define-vop (code-header-set word-index-set)
282 (:translate code-header-set)
284 (:variant 0 other-pointer-lowtag))