src/compiler/x86/cell.lisp

   1 ;;;; various primitive memory access VOPs for the x86 VM
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11
  12 (in-package "SB!VM")
  13 \f
  14 ;;;; data object ref/set stuff
  15
  16 (define-vop (slot)
  17   (:args (object :scs (descriptor-reg)))
  18   (:info name offset lowtag)
  19   (:ignore name)
  20   (:results (result :scs (descriptor-reg any-reg)))
  21   (:generator 1
  22     (loadw result object offset lowtag)))
  23
  24 (define-vop (set-slot)
  25   (:args (object :scs (descriptor-reg))
  26          (value :scs (descriptor-reg any-reg immediate)))
  27   (:info name offset lowtag)
  28   (:ignore name)
  29   (:results)
  30   (:generator 1
  31      (if (sc-is value immediate)
  32         (let ((val (tn-value value)))
  33            (etypecase val
  34               (integer
  35                (inst mov
  36                      (make-ea :dword :base object
  37                               :disp (- (* offset n-word-bytes) lowtag))
  38                      (fixnumize val)))
  39               (symbol
  40                (inst mov
  41                      (make-ea :dword :base object
  42                               :disp (- (* offset n-word-bytes) lowtag))
  43                      (+ nil-value (static-symbol-offset val))))
  44               (character
  45                (inst mov
  46                      (make-ea :dword :base object
  47                               :disp (- (* offset n-word-bytes) lowtag))
  48                      (logior (ash (char-code val) n-widetag-bits)
  49                              base-char-widetag)))))
  50        ;; Else, value not immediate.
  51        (storew value object offset lowtag))))
  52 \f
  53
  54
  55 ;;;; symbol hacking VOPs
  56
  57 ;;; these next two cf the sparc version, by jrd.
  58 ;;; FIXME: Deref this ^ reference.
  59
  60
  61 ;;; The compiler likes to be able to directly SET symbols.
  62 #!+sb-thread
  63 (define-vop (set)
  64   (:args (symbol :scs (descriptor-reg))
  65          (value :scs (descriptor-reg any-reg)))
  66   (:temporary (:sc descriptor-reg) tls)
  67   ;;(:policy :fast-safe)
  68   (:generator 4
  69     (let ((global-val (gen-label))
  70           (done (gen-label)))
  71       (loadw tls symbol symbol-tls-index-slot other-pointer-lowtag)
  72       (inst or tls tls)
  73       (inst jmp :z global-val)
  74       (inst fs-segment-prefix)
  75       (inst cmp (make-ea :dword :scale 1 :index tls) unbound-marker-widetag)
  76       (inst jmp :z global-val)
  77       (inst fs-segment-prefix)
  78       (inst mov (make-ea :dword :scale 1 :index tls) value)
  79       (inst jmp done)
  80       (emit-label global-val)
  81       (storew value symbol symbol-value-slot other-pointer-lowtag)
  82       (emit-label done))))
  83
  84 ;; unithreaded it's a lot simpler ...
  85 #!-sb-thread
  86 (define-vop (set cell-set)
  87   (:variant symbol-value-slot other-pointer-lowtag))
  88
  89 ;;; Do a cell ref with an error check for being unbound.
  90 ;;; XXX stil used? I can't see where -dan
  91 (define-vop (checked-cell-ref)
  92   (:args (object :scs (descriptor-reg) :target obj-temp))
  93   (:results (value :scs (descriptor-reg any-reg)))
  94   (:policy :fast-safe)
  95   (:vop-var vop)
  96   (:save-p :compute-only)
  97   (:temporary (:sc descriptor-reg :from (:argument 0)) obj-temp))
  98
  99 ;;; With Symbol-Value, we check that the value isn't the trap object. So
 100 ;;; Symbol-Value of NIL is NIL.
 101 #!+sb-thread
 102 (define-vop (symbol-value)
 103   (:translate symbol-value)
 104   (:policy :fast-safe)
 105   (:args (object :scs (descriptor-reg) :to (:result 1)))
 106   (:results (value :scs (descriptor-reg any-reg)))
 107   (:vop-var vop)
 108   (:save-p :compute-only)
 109   (:generator 9
 110     (let* ((err-lab (generate-error-code vop unbound-symbol-error object))
 111            (ret-lab (gen-label)))
 112       (loadw value object symbol-tls-index-slot other-pointer-lowtag)
 113       (inst fs-segment-prefix)
 114       (inst mov value (make-ea :dword :index value :scale 1))
 115       (inst cmp value unbound-marker-widetag)
 116       (inst jmp :ne ret-lab)
 117       (loadw value object symbol-value-slot other-pointer-lowtag)
 118       (inst cmp value unbound-marker-widetag)
 119       (inst jmp :e err-lab)
 120       (emit-label ret-lab))))
 121
 122 #!+sb-thread
 123 (define-vop (fast-symbol-value symbol-value)
 124   ;; KLUDGE: not really fast, in fact, because we're going to have to
 125   ;; do a full lookup of the thread-local area anyway.  But half of
 126   ;; the meaning of FAST-SYMBOL-VALUE is "do not signal an error if
 127   ;; unbound", which is used in the implementation of COPY-SYMBOL.  --
 128   ;; CSR, 2003-04-22
 129   (:policy :fast)
 130   (:translate symbol-value)
 131   (:generator 8
 132     (let ((ret-lab (gen-label)))
 133       (loadw value object symbol-tls-index-slot other-pointer-lowtag)
 134       (inst fs-segment-prefix)
 135       (inst mov value (make-ea :dword :index value :scale 1))
 136       (inst cmp value unbound-marker-widetag)
 137       (inst jmp :ne ret-lab)
 138       (loadw value object symbol-value-slot other-pointer-lowtag)
 139       (emit-label ret-lab))))
 140
 141 #!-sb-thread
 142 (define-vop (symbol-value)
 143   (:translate symbol-value)
 144   (:policy :fast-safe)
 145   (:args (object :scs (descriptor-reg) :to (:result 1)))
 146   (:results (value :scs (descriptor-reg any-reg)))
 147   (:vop-var vop)
 148   (:save-p :compute-only)
 149   (:generator 9
 150     (let ((err-lab (generate-error-code vop unbound-symbol-error object)))
 151       (loadw value object symbol-value-slot other-pointer-lowtag)
 152       (inst cmp value unbound-marker-widetag)
 153       (inst jmp :e err-lab))))
 154
 155 #!-sb-thread
 156 (define-vop (fast-symbol-value cell-ref)
 157   (:variant symbol-value-slot other-pointer-lowtag)
 158   (:policy :fast)
 159   (:translate symbol-value))
 160
 161 (defknown locked-symbol-global-value-add (symbol fixnum) fixnum ())
 162
 163 (define-vop (locked-symbol-global-value-add)
 164     (:args (object :scs (descriptor-reg) :to :result)
 165            (value :scs (any-reg) :target result))
 166   (:arg-types * tagged-num)
 167   (:results (result :scs (any-reg) :from (:argument 1)))
 168   (:policy :fast)
 169   (:translate locked-symbol-global-value-add)
 170   (:result-types tagged-num)
 171   (:policy :fast-safe)
 172   (:generator 4
 173     (move result value)
 174     (inst lock)
 175     (inst add (make-ea :dword :base object
 176                        :disp (- (* symbol-value-slot n-word-bytes)
 177                                 other-pointer-lowtag))
 178           value)))
 179
 180 #!+sb-thread
 181 (define-vop (boundp)
 182   (:translate boundp)
 183   (:policy :fast-safe)
 184   (:args (object :scs (descriptor-reg)))
 185   (:conditional)
 186   (:info target not-p)
 187   (:temporary (:sc descriptor-reg #+nil(:from (:argument 0))) value)
 188   (:generator 9
 189     (if not-p
 190         (let ((not-target (gen-label)))
 191           (loadw value object symbol-value-slot other-pointer-lowtag)
 192           (inst cmp value unbound-marker-widetag)
 193           (inst jmp :ne not-target)
 194           (loadw value object symbol-tls-index-slot other-pointer-lowtag)
 195           (inst fs-segment-prefix)
 196           (inst cmp (make-ea :dword :index value :scale 1) unbound-marker-widetag)
 197           (inst jmp  :e  target)
 198           (emit-label not-target))
 199         (progn
 200           (loadw value object symbol-value-slot other-pointer-lowtag)
 201           (inst cmp value unbound-marker-widetag)
 202           (inst jmp :ne target)
 203           (loadw value object symbol-tls-index-slot other-pointer-lowtag)
 204           (inst fs-segment-prefix)
 205           (inst cmp (make-ea :dword :index value :scale 1) unbound-marker-widetag)
 206           (inst jmp  :ne  target)))))
 207
 208 #!-sb-thread
 209 (define-vop (boundp)
 210   (:translate boundp)
 211   (:policy :fast-safe)
 212   (:args (object :scs (descriptor-reg)))
 213   (:conditional)
 214   (:info target not-p)
 215   (:temporary (:sc descriptor-reg :from (:argument 0)) value)
 216   (:generator 9
 217     (loadw value object symbol-value-slot other-pointer-lowtag)
 218     (inst cmp value unbound-marker-widetag)
 219     (inst jmp (if not-p :e :ne) target)))
 220
 221
 222 (define-vop (symbol-hash)
 223   (:policy :fast-safe)
 224   (:translate symbol-hash)
 225   (:args (symbol :scs (descriptor-reg)))
 226   (:results (res :scs (any-reg)))
 227   (:result-types positive-fixnum)
 228   (:generator 2
 229     ;; The symbol-hash slot of NIL holds NIL because it is also the
 230     ;; cdr slot, so we have to strip off the two low bits to make sure
 231     ;; it is a fixnum.  The lowtag selection magic that is required to
 232     ;; ensure this is explained in the comment in objdef.lisp
 233     (loadw res symbol symbol-hash-slot other-pointer-lowtag)
 234     (inst and res (lognot #b11))))
 235 \f
 236 ;;;; fdefinition (FDEFN) objects
 237
 238 (define-vop (fdefn-fun cell-ref)        ; /pfw - alpha
 239   (:variant fdefn-fun-slot other-pointer-lowtag))
 240
 241 (define-vop (safe-fdefn-fun)
 242   (:args (object :scs (descriptor-reg) :to (:result 1)))
 243   (:results (value :scs (descriptor-reg any-reg)))
 244   (:vop-var vop)
 245   (:save-p :compute-only)
 246   (:generator 10
 247     (loadw value object fdefn-fun-slot other-pointer-lowtag)
 248     (inst cmp value nil-value)
 249     (let ((err-lab (generate-error-code vop undefined-fun-error object)))
 250       (inst jmp :e err-lab))))
 251
 252 (define-vop (set-fdefn-fun)
 253   (:policy :fast-safe)
 254   (:translate (setf fdefn-fun))
 255   (:args (function :scs (descriptor-reg) :target result)
 256          (fdefn :scs (descriptor-reg)))
 257   (:temporary (:sc unsigned-reg) raw)
 258   (:temporary (:sc byte-reg) type)
 259   (:results (result :scs (descriptor-reg)))
 260   (:generator 38
 261     (load-type type function (- fun-pointer-lowtag))
 262     (inst lea raw
 263           (make-ea :byte :base function
 264                    :disp (- (* simple-fun-code-offset n-word-bytes)
 265                             fun-pointer-lowtag)))
 266     (inst cmp type simple-fun-header-widetag)
 267     (inst jmp :e normal-fn)
 268     (inst lea raw (make-fixup (extern-alien-name "closure_tramp") :foreign))
 269     NORMAL-FN
 270     (storew function fdefn fdefn-fun-slot other-pointer-lowtag)
 271     (storew raw fdefn fdefn-raw-addr-slot other-pointer-lowtag)
 272     (move result function)))
 273
 274 (define-vop (fdefn-makunbound)
 275   (:policy :fast-safe)
 276   (:translate fdefn-makunbound)
 277   (:args (fdefn :scs (descriptor-reg) :target result))
 278   (:results (result :scs (descriptor-reg)))
 279   (:generator 38
 280     (storew nil-value fdefn fdefn-fun-slot other-pointer-lowtag)
 281     (storew (make-fixup (extern-alien-name "undefined_tramp") :foreign)
 282             fdefn fdefn-raw-addr-slot other-pointer-lowtag)
 283     (move result fdefn)))
 284 \f
 285 ;;;; binding and unbinding
 286
 287 ;;; BIND -- Establish VAL as a binding for SYMBOL. Save the old value and
 288 ;;; the symbol on the binding stack and stuff the new value into the
 289 ;;; symbol.
 290
 291 #!+sb-thread
 292 (define-vop (bind)
 293   (:args (val :scs (any-reg descriptor-reg))
 294          (symbol :scs (descriptor-reg)))
 295   (:temporary (:sc unsigned-reg) tls-index temp bsp)
 296   (:generator 5
 297     (let ((tls-index-valid (gen-label)))
 298       (load-tl-symbol-value bsp *binding-stack-pointer*)
 299       (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
 300       (inst add bsp (* binding-size n-word-bytes))
 301       (store-tl-symbol-value bsp *binding-stack-pointer* temp)
 302
 303       (inst or tls-index tls-index)
 304       (inst jmp :ne tls-index-valid)
 305       ;; allocate a new tls-index
 306       (load-symbol-value tls-index *free-tls-index*)
 307       (inst add tls-index 4)            ;XXX surely we can do this more
 308       (store-symbol-value tls-index *free-tls-index*) ;succintly
 309       (inst sub tls-index 4)
 310       (storew tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
 311       (emit-label tls-index-valid)
 312       (inst fs-segment-prefix)
 313       (inst mov temp (make-ea :dword :scale 1 :index tls-index))
 314       (storew temp bsp (- binding-value-slot binding-size))
 315       (storew symbol bsp (- binding-symbol-slot binding-size))
 316       (inst fs-segment-prefix)
 317       (inst mov (make-ea :dword :scale 1 :index tls-index) val))))
 318
 319 #!-sb-thread
 320 (define-vop (bind)
 321   (:args (val :scs (any-reg descriptor-reg))
 322          (symbol :scs (descriptor-reg)))
 323   (:temporary (:sc unsigned-reg) temp bsp)
 324   (:generator 5
 325     (load-symbol-value bsp *binding-stack-pointer*)
 326     (loadw temp symbol symbol-value-slot other-pointer-lowtag)
 327     (inst add bsp (* binding-size n-word-bytes))
 328     (store-symbol-value bsp *binding-stack-pointer*)
 329     (storew temp bsp (- binding-value-slot binding-size))
 330     (storew symbol bsp (- binding-symbol-slot binding-size))
 331     (storew val symbol symbol-value-slot other-pointer-lowtag)))
 332
 333
 334 #!+sb-thread
 335 (define-vop (unbind)
 336     ;; four temporaries?
 337   (:temporary (:sc unsigned-reg) symbol value bsp tls-index)
 338   (:generator 0
 339     (load-tl-symbol-value bsp *binding-stack-pointer*)
 340     (loadw symbol bsp (- binding-symbol-slot binding-size))
 341     (loadw value bsp (- binding-value-slot binding-size))
 342
 343     (loadw tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
 344     (inst fs-segment-prefix)
 345     (inst mov (make-ea :dword :scale 1 :index tls-index) value)
 346
 347     (storew 0 bsp (- binding-symbol-slot binding-size))
 348     (inst sub bsp (* binding-size n-word-bytes))
 349     ;; we're done with value, so we can use it as a temp here
 350     (store-tl-symbol-value bsp *binding-stack-pointer* value)))
 351
 352 #!-sb-thread
 353 (define-vop (unbind)
 354   (:temporary (:sc unsigned-reg) symbol value bsp)
 355   (:generator 0
 356     (load-symbol-value bsp *binding-stack-pointer*)
 357     (loadw symbol bsp (- binding-symbol-slot binding-size))
 358     (loadw value bsp (- binding-value-slot binding-size))
 359     (storew value symbol symbol-value-slot other-pointer-lowtag)
 360     (storew 0 bsp (- binding-symbol-slot binding-size))
 361     (inst sub bsp (* binding-size n-word-bytes))
 362     (store-symbol-value bsp *binding-stack-pointer*)))
 363
 364
 365 (define-vop (unbind-to-here)
 366   (:args (where :scs (descriptor-reg any-reg)))
 367   (:temporary (:sc unsigned-reg) symbol value bsp #!+sb-thread tls-index)
 368   (:generator 0
 369     (load-tl-symbol-value bsp *binding-stack-pointer*)
 370     (inst cmp where bsp)
 371     (inst jmp :e done)
 372
 373     LOOP
 374     (loadw symbol bsp (- binding-symbol-slot binding-size))
 375     (inst or symbol symbol)
 376     (inst jmp :z skip)
 377     (loadw value bsp (- binding-value-slot binding-size))
 378     #!-sb-thread (storew value symbol symbol-value-slot other-pointer-lowtag)
 379
 380     #!+sb-thread (loadw
 381                   tls-index symbol symbol-tls-index-slot other-pointer-lowtag)
 382     #!+sb-thread (inst fs-segment-prefix)
 383     #!+sb-thread (inst mov (make-ea :dword :scale 1 :index tls-index) value)
 384     (storew 0 bsp (- binding-symbol-slot binding-size))
 385
 386     SKIP
 387     (inst sub bsp (* binding-size n-word-bytes))
 388     (inst cmp where bsp)
 389     (inst jmp :ne loop)
 390     ;; we're done with value, so can use it as a temporary
 391     (store-tl-symbol-value bsp *binding-stack-pointer* value)
 392
 393     DONE))
 394 \f
 395
 396 \f
 397 ;;;; closure indexing
 398
 399 (define-full-reffer closure-index-ref *
 400   closure-info-offset fun-pointer-lowtag
 401   (any-reg descriptor-reg) * %closure-index-ref)
 402
 403 (define-full-setter set-funcallable-instance-info *
 404   funcallable-instance-info-offset fun-pointer-lowtag
 405   (any-reg descriptor-reg) * %set-funcallable-instance-info)
 406
 407 (define-full-reffer funcallable-instance-info *
 408   funcallable-instance-info-offset fun-pointer-lowtag
 409   (descriptor-reg any-reg) * %funcallable-instance-info)
 410
 411 (define-vop (funcallable-instance-lexenv cell-ref)
 412   (:variant funcallable-instance-lexenv-slot fun-pointer-lowtag))
 413
 414 (define-vop (closure-ref slot-ref)
 415   (:variant closure-info-offset fun-pointer-lowtag))
 416
 417 (define-vop (closure-init slot-set)
 418   (:variant closure-info-offset fun-pointer-lowtag))
 419 \f
 420 ;;;; value cell hackery
 421
 422 (define-vop (value-cell-ref cell-ref)
 423   (:variant value-cell-value-slot other-pointer-lowtag))
 424
 425 (define-vop (value-cell-set cell-set)
 426   (:variant value-cell-value-slot other-pointer-lowtag))
 427 \f
 428 ;;;; structure hackery
 429
 430 (define-vop (instance-length)
 431   (:policy :fast-safe)
 432   (:translate %instance-length)
 433   (:args (struct :scs (descriptor-reg)))
 434   (:results (res :scs (unsigned-reg)))
 435   (:result-types positive-fixnum)
 436   (:generator 4
 437     (loadw res struct 0 instance-pointer-lowtag)
 438     (inst shr res n-widetag-bits)))
 439
 440 (define-vop (instance-ref slot-ref)
 441   (:variant instance-slots-offset instance-pointer-lowtag)
 442   (:policy :fast-safe)
 443   (:translate %instance-ref)
 444   (:arg-types instance (:constant index)))
 445
 446 (define-vop (instance-set slot-set)
 447   (:policy :fast-safe)
 448   (:translate %instance-set)
 449   (:variant instance-slots-offset instance-pointer-lowtag)
 450   (:arg-types instance (:constant index) *))
 451
 452 (define-full-reffer instance-index-ref * instance-slots-offset
 453   instance-pointer-lowtag (any-reg descriptor-reg) * %instance-ref)
 454
 455 (define-full-setter instance-index-set * instance-slots-offset
 456   instance-pointer-lowtag (any-reg descriptor-reg) * %instance-set)
 457
 458
 459 (defknown %instance-set-conditional (instance index t t) t
 460           (unsafe))
 461
 462 (define-vop (instance-set-conditional)
 463   (:translate %instance-set-conditional)
 464   (:args (object :scs (descriptor-reg) :to :eval)
 465          (slot :scs (any-reg) :to :result)
 466          (old-value :scs (descriptor-reg any-reg) :target eax)
 467          (new-value :scs (descriptor-reg any-reg)))
 468   (:arg-types instance positive-fixnum * *)
 469   (:temporary (:sc descriptor-reg :offset eax-offset
 470                    :from (:argument 2) :to :result :target result)  eax)
 471   (:results (result :scs (descriptor-reg any-reg)))
 472   ;(:guard (backend-featurep :i486))
 473   (:policy :fast-safe)
 474   (:generator 5
 475     (move eax old-value)
 476     (inst lock)
 477     (inst cmpxchg (make-ea :dword :base object :index slot :scale 1
 478                            :disp (- (* instance-slots-offset n-word-bytes)
 479                                     instance-pointer-lowtag))
 480           new-value)
 481     (move result eax)))
 482
 483
 484 \f
 485 ;;;; code object frobbing
 486
 487 (define-full-reffer code-header-ref * 0 other-pointer-lowtag
 488   (any-reg descriptor-reg) * code-header-ref)
 489
 490 (define-full-setter code-header-set * 0 other-pointer-lowtag
 491   (any-reg descriptor-reg) * code-header-set)