cell.lisp

开源跨平台Lisp编译器

    (storew (make-fixup "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.

;;; FIXME: Split into DYNBIND and BIND: DYNBIND needs to ensure
;;; TLS-INDEX, whereas BIND should assume it is already in place. Make
;;; LET &co compile into BIND, and PROGV into DYNBIND, plus ensure
;;; TLS-INDEX at compile-time, and make loader and dumper preserve
;;; the existence of a TLS-INDEX.
#!+sb-thread
(define-vop (bind)
  (:args (val :scs (any-reg descriptor-reg))
         (symbol :scs (descriptor-reg)))
  (:temporary (:sc unsigned-reg) tls-index bsp)
  (:generator 10
    (let ((tls-index-valid (gen-label)))
      (load-binding-stack-pointer bsp)
      (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
      (inst add bsp (* binding-size n-word-bytes))
      (store-binding-stack-pointer bsp)
      (inst or tls-index tls-index)
      (inst jmp :ne tls-index-valid)
      (inst mov tls-index symbol)
      (inst call (make-fixup
                  (ecase (tn-offset tls-index)
                    (#.eax-offset 'alloc-tls-index-in-eax)
                    (#.ebx-offset 'alloc-tls-index-in-ebx)
                    (#.ecx-offset 'alloc-tls-index-in-ecx)
                    (#.edx-offset 'alloc-tls-index-in-edx)
                    (#.edi-offset 'alloc-tls-index-in-edi)
                    (#.esi-offset 'alloc-tls-index-in-esi))
                  :assembly-routine))
      (emit-label tls-index-valid)
      (inst push (make-ea :dword :base tls-index) :fs)
      (popw bsp (- binding-value-slot binding-size))
      (storew symbol bsp (- binding-symbol-slot binding-size))
      (inst mov (make-ea :dword :base tls-index) val :fs))))

#!-sb-thread
(define-vop (bind)
  (:args (val :scs (any-reg descriptor-reg))
         (symbol :scs (descriptor-reg)))
  (:temporary (:sc unsigned-reg) temp bsp)
  (:generator 5
    (load-symbol-value bsp *binding-stack-pointer*)
    (loadw temp symbol symbol-value-slot other-pointer-lowtag)
    (inst add bsp (* binding-size n-word-bytes))
    (store-symbol-value bsp *binding-stack-pointer*)
    (storew temp bsp (- binding-value-slot binding-size))
    (storew symbol bsp (- binding-symbol-slot binding-size))
    (storew val symbol symbol-value-slot other-pointer-lowtag)))

#!+sb-thread
(define-vop (unbind)
  (:temporary (:sc unsigned-reg) temp bsp tls-index)
  (:generator 0
    (load-binding-stack-pointer bsp)
    ;; Load SYMBOL from stack, and get the TLS-INDEX.
    (loadw temp bsp (- binding-symbol-slot binding-size))
    (loadw tls-index temp symbol-tls-index-slot other-pointer-lowtag)
    ;; Load VALUE from stack, then restore it to the TLS area.
    (loadw temp bsp (- binding-value-slot binding-size))
    (inst mov (make-ea :dword :base tls-index) temp :fs)
    ;; Zero out the stack.
    (storew 0 bsp (- binding-symbol-slot binding-size))
    (storew 0 bsp (- binding-value-slot binding-size))
    (inst sub bsp (* binding-size n-word-bytes))
    (store-binding-stack-pointer bsp)))

#!-sb-thread
(define-vop (unbind)
  (:temporary (:sc unsigned-reg) symbol value bsp)
  (:generator 0
    (load-symbol-value bsp *binding-stack-pointer*)
    (loadw symbol bsp (- binding-symbol-slot binding-size))
    (loadw value bsp (- binding-value-slot binding-size))
    (storew value symbol symbol-value-slot other-pointer-lowtag)
    (storew 0 bsp (- binding-symbol-slot binding-size))
    (storew 0 bsp (- binding-value-slot binding-size))
    (inst sub bsp (* binding-size n-word-bytes))
    (store-symbol-value bsp *binding-stack-pointer*)))


(define-vop (unbind-to-here)
  (:args (where :scs (descriptor-reg any-reg)))
  (:temporary (:sc unsigned-reg) symbol value bsp #!+sb-thread tls-index)
  (:generator 0
    (load-binding-stack-pointer bsp)
    (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)
    ;; Bind stack debug sentinels have the unbound marker in the symbol slot
    (inst cmp symbol unbound-marker-widetag)
    (inst jmp :eq skip)
    (loadw value bsp (- binding-value-slot binding-size))
    #!-sb-thread (storew value symbol symbol-value-slot other-pointer-lowtag)

    #!+sb-thread (loadw
                  tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
    #!+sb-thread (inst mov (make-ea :dword :base tls-index) value :fs)
    (storew 0 bsp (- binding-symbol-slot binding-size))

    SKIP
    (storew 0 bsp (- binding-value-slot binding-size))
    (inst sub bsp (* binding-size n-word-bytes))
    (inst cmp where bsp)
    (inst jmp :ne loop)
    (store-binding-stack-pointer bsp)

    DONE))

(define-vop (bind-sentinel)
  (:temporary (:sc unsigned-reg) bsp)
  (:generator 1
     (load-binding-stack-pointer bsp)
     (inst add bsp (* binding-size n-word-bytes))
     (storew unbound-marker-widetag bsp (- binding-symbol-slot binding-size))
     (storew ebp-tn bsp (- binding-value-slot binding-size))
     (store-binding-stack-pointer bsp)))

(define-vop (unbind-sentinel)
  (:temporary (:sc unsigned-reg) bsp)
  (:generator 1
     (load-binding-stack-pointer bsp)
     (storew 0 bsp (- binding-value-slot binding-size))
     (storew 0 bsp (- binding-symbol-slot binding-size))
     (inst sub bsp (* binding-size n-word-bytes))
     (store-binding-stack-pointer bsp)))



;;;; 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 (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-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)

(define-full-compare-and-swap %compare-and-swap-instance-ref instance
  instance-slots-offset instance-pointer-lowtag
  (any-reg descriptor-reg) *
  %compare-and-swap-instance-ref)

;;;; 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)

;;;; raw instance slot accessors

(defun make-ea-for-raw-slot (object index instance-length n-words)
  (if (integerp instance-length)
      ;; For RAW-INSTANCE-INIT/* VOPs, which know the exact instance length
      ;; at compile time.
      (make-ea :dword
               :base object
               :disp (- (* (- instance-length instance-slots-offset index (1- n-words))
                           n-word-bytes)
                        instance-pointer-lowtag))
      (flet ((make-ea-using-value (value)
               (make-ea :dword :base object
                        :index instance-length
                        :scale 4
                        :disp (- (* (- instance-slots-offset n-words)
                                    n-word-bytes)
                                 instance-pointer-lowtag
                                 (* value n-word-bytes)))))
        (if (typep index 'tn)
            (sc-case index
              (any-reg (make-ea :dword
                                :base object
                                :index instance-length
                                :disp (- (* (- instance-slots-offset n-words)
                                            n-word-bytes)
                                         instance-pointer-lowtag)))
              (immediate (make-ea-using-value (tn-value index))))
            (make-ea-using-value index)))))

(define-vop (raw-instance-ref/word)
  (:translate %raw-instance-ref/word)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg)) (index :scs (any-reg immediate)))
  (:arg-types * tagged-num)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (value :scs (unsigned-reg)))
  (:result-types unsigned-num)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (inst mov value (make-ea-for-raw-slot object index tmp 1))))

(define-vop (raw-instance-set/word)
  (:translate %raw-instance-set/word)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate))
         (value :scs (unsigned-reg) :target result))
  (:arg-types * tagged-num unsigned-num)
  (:temporary (:sc unsigned-reg) tmp)
  (:results (result :scs (unsigned-reg)))
  (:result-types unsigned-num)
  (:generator 5
    (loadw tmp object 0 instance-pointer-lowtag)
    (inst shr tmp n-widetag-bits)
    (when (sc-is index any-reg)
      (inst shl tmp 2)
      (inst sub tmp index))
    (inst mov (make-ea-for-raw-slot object index tmp 1) value)
    (move result value)))

(define-vop (raw-instance-init/word)
  (:args (object :scs (descriptor-reg))
         (value :scs (unsigned-reg)))
  (:arg-types * unsigned-num)
  (:info instance-length index)
  (:generator 5
    (inst mov (make-ea-for-raw-slot object index instance-length 1) value)))

(define-vop (raw-instance-atomic-incf/word)
  (:translate %raw-instance-atomic-incf/word)
  (:policy :fast-safe)
  (:args (object :scs (descriptor-reg))
         (index :scs (any-reg immediate))
         (diff :scs (signed-reg) :target result))
  (:arg-types * tagged-num signed-num)