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;;;; various primitive memory access VOPs for the x86 VM
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!VM")
;;;; data object ref/set stuff
(define-vop (slot)
(:args (object :scs (descriptor-reg)))
(:info name offset lowtag)
(:ignore name)
(:results (result :scs (descriptor-reg any-reg)))
(:generator 1
(loadw result object offset lowtag)))
(define-vop (set-slot)
(:args (object :scs (descriptor-reg))
(value :scs (descriptor-reg any-reg immediate)))
(:info name offset lowtag)
(:ignore name)
(:results)
(:generator 1
(if (sc-is value immediate)
(let ((val (tn-value value)))
(etypecase val
(integer
(inst mov
(make-ea :dword :base object
:disp (- (* offset n-word-bytes) lowtag))
(fixnumize val)))
(symbol
(inst mov
(make-ea :dword :base object
:disp (- (* offset n-word-bytes) lowtag))
(+ nil-value (static-symbol-offset val))))
(character
(inst mov
(make-ea :dword :base object
:disp (- (* offset n-word-bytes) lowtag))
(logior (ash (char-code val) n-widetag-bits)
base-char-widetag)))))
;; Else, value not immediate.
(storew value object offset lowtag))))
;;;; symbol hacking VOPs
;;; these next two cf the sparc version, by jrd.
;;; FIXME: Deref this ^ reference.
;;; The compiler likes to be able to directly SET symbols.
(define-vop (set)
(:args (symbol :scs (descriptor-reg))
(value :scs (descriptor-reg any-reg)))
(:translate sb!kernel:%set-symbol-value)
(:temporary (:sc descriptor-reg ) tls)
;;(:policy :fast-safe)
(:generator 4
(let ((global-val (gen-label))
(done (gen-label)))
(loadw tls symbol symbol-tls-index-slot other-pointer-lowtag)
(inst or tls tls)
(inst jmp :z global-val)
(inst gs-segment-prefix)
(inst cmp (make-ea :dword :scale 1 :index tls) unbound-marker-widetag)
(inst jmp :z global-val)
(inst gs-segment-prefix)
(inst mov (make-ea :dword :scale 1 :index tls) value)
(inst jmp done)
(emit-label global-val)
(storew value symbol symbol-value-slot other-pointer-lowtag)
(emit-label done))))
;;; Do a cell ref with an error check for being unbound.
;;; XXX stil used? I can't see where -dan
(define-vop (checked-cell-ref)
(:args (object :scs (descriptor-reg) :target obj-temp))
(:results (value :scs (descriptor-reg any-reg)))
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:temporary (:sc descriptor-reg :from (:argument 0)) obj-temp))
;;; With Symbol-Value, we check that the value isn't the trap object. So
;;; Symbol-Value of NIL is NIL.
(define-vop (symbol-value)
(:translate symbol-value)
(:policy :fast-safe)
(:args (object :scs (descriptor-reg) :to (:result 1)))
(:results (value :scs (descriptor-reg any-reg)))
(:vop-var vop)
(:save-p :compute-only)
(:generator 9
(let* ((err-lab (generate-error-code vop unbound-symbol-error object))
(ret-lab (gen-label)))
(loadw value object symbol-tls-index-slot other-pointer-lowtag)
(inst gs-segment-prefix)
(inst mov value (make-ea :dword :index value :scale 1))
(inst cmp value unbound-marker-widetag)
(inst jmp :ne ret-lab)
(loadw value object symbol-value-slot other-pointer-lowtag)
(inst cmp value unbound-marker-widetag)
(inst jmp :e err-lab)
(emit-label ret-lab))))
#+nil
(define-vop (symbol-value)
(:translate symbol-value)
(:policy :fast-safe)
(:args (object :scs (descriptor-reg) :to (:result 1)))
(:results (value :scs (descriptor-reg any-reg)))
(:vop-var vop)
(:save-p :compute-only)
(:generator 9
(let ((err-lab (generate-error-code vop unbound-symbol-error object)))
(loadw value object symbol-value-slot other-pointer-lowtag)
(inst cmp value unbound-marker-widetag)
(inst jmp :e err-lab))))
#+nil
(define-vop (fast-symbol-value cell-ref)
(:variant symbol-value-slot other-pointer-lowtag)
(:policy :fast)
(:translate symbol-value))
;;; like to know where this is useed too
#+nil
(defknown fast-symbol-value-xadd (symbol fixnum) fixnum ())
#+nil
(define-vop (fast-symbol-value-xadd cell-xadd)
(:variant symbol-value-slot other-pointer-lowtag)
(:policy :fast)
(:translate fast-symbol-value-xadd)
(:arg-types * tagged-num))
(define-vop (boundp)
(:translate boundp)
(:policy :fast-safe)
(:args (object :scs (descriptor-reg)))
(:conditional)
(:info target not-p)
(:temporary (:sc descriptor-reg #+nil(:from (:argument 0))) value)
(:generator 9
(if not-p
(let ((not-target (gen-label)))
(loadw value object symbol-value-slot other-pointer-lowtag)
(inst cmp value unbound-marker-widetag)
(inst jmp :ne not-target)
(loadw value object symbol-tls-index-slot other-pointer-lowtag)
(inst gs-segment-prefix)
(inst cmp (make-ea :dword :index value :scale 1) unbound-marker-widetag)
(inst jmp :e target)
(emit-label not-target))
(progn
(loadw value object symbol-value-slot other-pointer-lowtag)
(inst cmp value unbound-marker-widetag)
(inst jmp :ne target)
(loadw value object symbol-tls-index-slot other-pointer-lowtag)
(inst gs-segment-prefix)
(inst cmp (make-ea :dword :index value :scale 1) unbound-marker-widetag)
(inst jmp :ne target)))))
(define-vop (symbol-hash)
(:policy :fast-safe)
(:translate symbol-hash)
(:args (symbol :scs (descriptor-reg)))
(:results (res :scs (any-reg)))
(:result-types positive-fixnum)
(:generator 2
;; The symbol-hash slot of NIL holds NIL because it is also the
;; cdr slot, so we have to strip off the two low bits to make sure
;; it is a fixnum. The lowtag selection magic that is required to
;; ensure this is explained in the comment in objdef.lisp
(loadw res symbol symbol-hash-slot other-pointer-lowtag)
(inst and res (lognot #b11))))
;;;; fdefinition (FDEFN) objects
(define-vop (fdefn-fun cell-ref) ; /pfw - alpha
(:variant fdefn-fun-slot other-pointer-lowtag))
(define-vop (safe-fdefn-fun)
(:args (object :scs (descriptor-reg) :to (:result 1)))
(:results (value :scs (descriptor-reg any-reg)))
(:vop-var vop)
(:save-p :compute-only)
(:generator 10
(loadw value object fdefn-fun-slot other-pointer-lowtag)
(inst cmp value nil-value)
(let ((err-lab (generate-error-code vop undefined-fun-error object)))
(inst jmp :e err-lab))))
(define-vop (set-fdefn-fun)
(:policy :fast-safe)
(:translate (setf fdefn-fun))
(:args (function :scs (descriptor-reg) :target result)
(fdefn :scs (descriptor-reg)))
(:temporary (:sc unsigned-reg) raw)
(:temporary (:sc byte-reg) type)
(:results (result :scs (descriptor-reg)))
(:generator 38
(load-type type function (- fun-pointer-lowtag))
(inst lea raw
(make-ea :byte :base function
:disp (- (* simple-fun-code-offset n-word-bytes)
fun-pointer-lowtag)))
(inst cmp type simple-fun-header-widetag)
(inst jmp :e normal-fn)
(inst lea raw (make-fixup (extern-alien-name "closure_tramp") :foreign))
NORMAL-FN
(storew function fdefn fdefn-fun-slot other-pointer-lowtag)
(storew raw fdefn fdefn-raw-addr-slot other-pointer-lowtag)
(move result function)))
(define-vop (fdefn-makunbound)
(:policy :fast-safe)
(:translate fdefn-makunbound)
(:args (fdefn :scs (descriptor-reg) :target result))
(:results (result :scs (descriptor-reg)))
(:generator 38
(storew nil-value fdefn fdefn-fun-slot other-pointer-lowtag)
(storew (make-fixup (extern-alien-name "undefined_tramp") :foreign)
fdefn fdefn-raw-addr-slot other-pointer-lowtag)
(move result fdefn)))
;;;; binding and unbinding
;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
;;; the symbol on the binding stack and stuff the new value into the
;;; symbol.
(define-vop (bind)
(:args (val :scs (any-reg descriptor-reg))
(symbol :scs (descriptor-reg)))
(:temporary (:sc unsigned-reg) tls-index temp bsp)
(:generator 5
(let ((tls-index-valid (gen-label)))
(load-tl-symbol-value bsp *binding-stack-pointer*)
(loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
(inst add bsp (* binding-size n-word-bytes))
(store-tl-symbol-value bsp *binding-stack-pointer* temp)
(inst or tls-index tls-index)
(inst jmp :ne tls-index-valid)
;; allocate a new tls-index
(load-symbol-value tls-index *free-tls-index*)
(inst add tls-index 4) ;XXX surely we can do this more
(store-symbol-value tls-index *free-tls-index*) ;succintly
(inst sub tls-index 4)
(storew tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
(emit-label tls-index-valid)
(inst gs-segment-prefix)
(inst mov temp (make-ea :dword :scale 1 :index tls-index))
(storew temp bsp (- binding-value-slot binding-size))
(storew symbol bsp (- binding-symbol-slot binding-size))
(inst gs-segment-prefix)
(inst mov (make-ea :dword :scale 1 :index tls-index) val))))
(define-vop (unbind)
;; four temporaries?
(:temporary (:sc unsigned-reg) symbol value bsp tls-index)
(:generator 0
(load-tl-symbol-value bsp *binding-stack-pointer*)
(loadw symbol bsp (- binding-symbol-slot binding-size))
(loadw value bsp (- binding-value-slot binding-size))
(loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
(inst gs-segment-prefix)
(inst mov (make-ea :dword :scale 1 :index tls-index) value)
(storew 0 bsp (- binding-symbol-slot binding-size))
(inst sub bsp (* binding-size n-word-bytes))
;; we're done with value, so we can use it as a temp here
(store-tl-symbol-value bsp *binding-stack-pointer* value)))
(define-vop (unbind-to-here)
(:args (where :scs (descriptor-reg any-reg)))
(:temporary (:sc unsigned-reg) symbol value bsp tls-index)
(:generator 0
(load-tl-symbol-value bsp *binding-stack-pointer*)
(inst cmp where bsp)
(inst jmp :e done)
LOOP
(loadw symbol bsp (- binding-symbol-slot binding-size))
(inst or symbol symbol)
(inst jmp :z skip)
(loadw value bsp (- binding-value-slot binding-size))
(loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
(inst gs-segment-prefix)
(inst mov (make-ea :dword :scale 1 :index tls-index) value)
(storew 0 bsp (- binding-symbol-slot binding-size))
SKIP
(inst sub bsp (* binding-size n-word-bytes))
(inst cmp where bsp)
(inst jmp :ne loop)
;; we're done with value, so can use it as a temporary
(store-tl-symbol-value bsp *binding-stack-pointer* value)
DONE))
;;;; closure indexing
(define-full-reffer closure-index-ref *
closure-info-offset fun-pointer-lowtag
(any-reg descriptor-reg) * %closure-index-ref)
(define-full-setter set-funcallable-instance-info *
funcallable-instance-info-offset fun-pointer-lowtag
(any-reg descriptor-reg) * %set-funcallable-instance-info)
(define-full-reffer funcallable-instance-info *
funcallable-instance-info-offset fun-pointer-lowtag
(descriptor-reg any-reg) * %funcallable-instance-info)
(define-vop (funcallable-instance-lexenv cell-ref)
(:variant funcallable-instance-lexenv-slot fun-pointer-lowtag))
(define-vop (closure-ref slot-ref)
(:variant closure-info-offset fun-pointer-lowtag))
(define-vop (closure-init slot-set)
(:variant closure-info-offset fun-pointer-lowtag))
;;;; value cell hackery
(define-vop (value-cell-ref cell-ref)
(:variant value-cell-value-slot other-pointer-lowtag))
(define-vop (value-cell-set cell-set)
(:variant value-cell-value-slot other-pointer-lowtag))
;;;; structure hackery
(define-vop (instance-length)
(:policy :fast-safe)
(:translate %instance-length)
(:args (struct :scs (descriptor-reg)))
(:results (res :scs (unsigned-reg)))
(:result-types positive-fixnum)
(:generator 4
(loadw res struct 0 instance-pointer-lowtag)
(inst shr res n-widetag-bits)))
(define-vop (instance-ref slot-ref)
(:variant instance-slots-offset instance-pointer-lowtag)
(:policy :fast-safe)
(:translate %instance-ref)
(:arg-types instance (:constant index)))
(define-vop (instance-set slot-set)
(:policy :fast-safe)
(:translate %instance-set)
(:variant instance-slots-offset instance-pointer-lowtag)
(:arg-types instance (:constant index) *))
(define-full-reffer instance-index-ref * instance-slots-offset
instance-pointer-lowtag (any-reg descriptor-reg) * %instance-ref)
(define-full-setter instance-index-set * instance-slots-offset
instance-pointer-lowtag (any-reg descriptor-reg) * %instance-set)
(defknown %instance-set-conditional (instance index t t) t
(unsafe))
(define-vop (instance-set-conditional)
(:translate %instance-set-conditional)
(:args (object :scs (descriptor-reg) :to :eval)
(slot :scs (any-reg) :to :result)
(old-value :scs (descriptor-reg any-reg) :target eax)
(new-value :scs (descriptor-reg any-reg)))
(:arg-types instance positive-fixnum * *)
(:temporary (:sc descriptor-reg :offset eax-offset
:from (:argument 2) :to :result :target result) eax)
(:results (result :scs (descriptor-reg any-reg)))
;(:guard (backend-featurep :i486))
(:policy :fast-safe)
(:generator 5
(move eax old-value)
(inst cmpxchg (make-ea :dword :base object :index slot :scale 1
:disp (- (* instance-slots-offset n-word-bytes)
instance-pointer-lowtag))
new-value)
(move result eax)))
;;;; code object frobbing
(define-full-reffer code-header-ref * 0 other-pointer-lowtag
(any-reg descriptor-reg) * code-header-ref)
(define-full-setter code-header-set * 0 other-pointer-lowtag
(any-reg descriptor-reg) * code-header-set)