src/compiler/x86-64/alloc.lisp

   1 ;;;; allocation VOPs for the x86-64
   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 ;;;; CONS, LIST and LIST*
  15 (defoptimizer (cons stack-allocate-result) ((&rest args))
  16   t)
  17 (defoptimizer (list stack-allocate-result) ((&rest args))
  18   (not (null args)))
  19 (defoptimizer (list* stack-allocate-result) ((&rest args))
  20   (not (null (rest args))))
  21
  22 (define-vop (list-or-list*)
  23   (:args (things :more t))
  24   (:temporary (:sc unsigned-reg) ptr temp)
  25   (:temporary (:sc unsigned-reg :to (:result 0) :target result) res)
  26   (:info num)
  27   (:results (result :scs (descriptor-reg)))
  28   (:variant-vars star)
  29   (:policy :safe)
  30   (:node-var node)
  31   (:generator 0
  32     (cond ((zerop num)
  33            ;; (move result nil-value)
  34            (inst mov result nil-value))
  35           ((and star (= num 1))
  36            (move result (tn-ref-tn things)))
  37           (t
  38            (macrolet
  39                ((store-car (tn list &optional (slot cons-car-slot))
  40                   `(let ((reg
  41                           (sc-case ,tn
  42                             ((any-reg descriptor-reg) ,tn)
  43                             ((control-stack)
  44                              (move temp ,tn)
  45                              temp))))
  46                      (storew reg ,list ,slot list-pointer-lowtag))))
  47              (let ((cons-cells (if star (1- num) num))
  48                    (stack-allocate-p (awhen (sb!c::node-lvar node)
  49                                        (sb!c::lvar-dynamic-extent it))))
  50                (maybe-pseudo-atomic stack-allocate-p
  51                 (allocation res (* (pad-data-block cons-size) cons-cells) node
  52                             stack-allocate-p list-pointer-lowtag)
  53                 (move ptr res)
  54                 (dotimes (i (1- cons-cells))
  55                   (store-car (tn-ref-tn things) ptr)
  56                   (setf things (tn-ref-across things))
  57                   (inst add ptr (pad-data-block cons-size))
  58                   (storew ptr ptr (- cons-cdr-slot cons-size)
  59                           list-pointer-lowtag))
  60                 (store-car (tn-ref-tn things) ptr)
  61                 (cond (star
  62                        (setf things (tn-ref-across things))
  63                        (store-car (tn-ref-tn things) ptr cons-cdr-slot))
  64                       (t
  65                        (storew nil-value ptr cons-cdr-slot
  66                                list-pointer-lowtag)))
  67                 (aver (null (tn-ref-across things)))))
  68              (move result res))))))
  69
  70 (define-vop (list list-or-list*)
  71   (:variant nil))
  72
  73 (define-vop (list* list-or-list*)
  74   (:variant t))
  75 \f
  76 ;;;; special-purpose inline allocators
  77
  78 ;;; ALLOCATE-VECTOR
  79 (define-vop (allocate-vector-on-heap)
  80   (:args (type :scs (unsigned-reg))
  81          (length :scs (any-reg))
  82          (words :scs (any-reg)))
  83   (:results (result :scs (descriptor-reg) :from :load))
  84   (:arg-types positive-fixnum
  85               positive-fixnum
  86               positive-fixnum)
  87   (:policy :fast-safe)
  88   (:generator 100
  89     (inst lea result (make-ea :byte :base words :disp
  90                               (+ (1- (ash 1 n-lowtag-bits))
  91                                  (* vector-data-offset n-word-bytes))))
  92     (inst and result (lognot lowtag-mask))
  93     (pseudo-atomic
  94       (allocation result result)
  95       (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
  96       (storew type result 0 other-pointer-lowtag)
  97       (storew length result vector-length-slot other-pointer-lowtag))))
  98
  99 (define-vop (allocate-vector-on-stack)
 100   (:args (type :scs (unsigned-reg))
 101          (length :scs (any-reg))
 102          (words :scs (any-reg) :target ecx))
 103   (:temporary (:sc any-reg :offset ecx-offset :from (:argument 2)) ecx)
 104   (:temporary (:sc any-reg :offset eax-offset :from (:argument 2)) zero)
 105   (:temporary (:sc any-reg :offset edi-offset :from (:argument 0)) res)
 106   (:results (result :scs (descriptor-reg) :from :load))
 107   (:arg-types positive-fixnum
 108               positive-fixnum
 109               positive-fixnum)
 110   (:translate allocate-vector)
 111   (:policy :fast-safe)
 112   (:node-var node)
 113   (:generator 100
 114     (inst lea result (make-ea :byte :base words :disp
 115                               (+ (1- (ash 1 n-lowtag-bits))
 116                                  (* vector-data-offset n-word-bytes))))
 117     (inst and result (lognot lowtag-mask))
 118     ;; FIXME: It would be good to check for stack overflow here.
 119     (move ecx words)
 120     (inst shr ecx n-fixnum-tag-bits)
 121     (allocation result result node t other-pointer-lowtag)
 122     (inst cld)
 123     (inst lea res
 124           (make-ea :byte :base result :disp (- (* vector-data-offset n-word-bytes)
 125                                                other-pointer-lowtag)))
 126     (storew type result 0 other-pointer-lowtag)
 127     (storew length result vector-length-slot other-pointer-lowtag)
 128     (zeroize zero)
 129     (inst rep)
 130     (inst stos zero)))
 131
 132 (in-package "SB!C")
 133
 134 (defoptimizer (allocate-vector stack-allocate-result)
 135     ((type length words) node)
 136   (ecase (policy node stack-allocate-vector)
 137     (0 nil)
 138     ((1 2)
 139      ;; a vector object should fit in one page
 140      (values-subtypep (lvar-derived-type words)
 141                       (load-time-value
 142                        (specifier-type `(integer 0 ,(- (/ sb!vm::*backend-page-size*
 143                                                           sb!vm:n-word-bytes)
 144                                                        sb!vm:vector-data-offset))))))
 145     (3 t)))
 146
 147 (defoptimizer (allocate-vector ltn-annotate) ((type length words) call ltn-policy)
 148   (let ((args (basic-combination-args call))
 149         (template (template-or-lose (if (awhen (node-lvar call)
 150                                           (lvar-dynamic-extent it))
 151                                         'sb!vm::allocate-vector-on-stack
 152                                         'sb!vm::allocate-vector-on-heap))))
 153     (dolist (arg args)
 154       (setf (lvar-info arg)
 155             (make-ir2-lvar (primitive-type (lvar-type arg)))))
 156     (unless (is-ok-template-use template call (ltn-policy-safe-p ltn-policy))
 157       (ltn-default-call call)
 158       (return-from allocate-vector-ltn-annotate-optimizer (values)))
 159     (setf (basic-combination-info call) template)
 160     (setf (node-tail-p call) nil)
 161
 162     (dolist (arg args)
 163       (annotate-1-value-lvar arg))))
 164
 165 (in-package "SB!VM")
 166
 167 ;;;
 168 (define-vop (allocate-code-object)
 169   (:args (boxed-arg :scs (any-reg) :target boxed)
 170          (unboxed-arg :scs (any-reg) :target unboxed))
 171   (:results (result :scs (descriptor-reg) :from :eval))
 172   (:temporary (:sc unsigned-reg :from (:argument 0)) boxed)
 173   (:temporary (:sc unsigned-reg :from (:argument 1)) unboxed)
 174   (:node-var node)
 175   (:generator 100
 176     (move boxed boxed-arg)
 177     (inst add boxed (fixnumize (1+ code-trace-table-offset-slot)))
 178     (inst and boxed (lognot lowtag-mask))
 179     (move unboxed unboxed-arg)
 180     (inst shr unboxed word-shift)
 181     (inst add unboxed lowtag-mask)
 182     (inst and unboxed (lognot lowtag-mask))
 183     (inst mov result boxed)
 184     (inst add result unboxed)
 185     (pseudo-atomic
 186      (allocation result result node)
 187      (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
 188      (inst shl boxed (- n-widetag-bits word-shift))
 189      (inst or boxed code-header-widetag)
 190      (storew boxed result 0 other-pointer-lowtag)
 191      (storew unboxed result code-code-size-slot other-pointer-lowtag)
 192      (storew nil-value result code-entry-points-slot other-pointer-lowtag))
 193     (storew nil-value result code-debug-info-slot other-pointer-lowtag)))
 194 \f
 195 (define-vop (make-fdefn)
 196   (:policy :fast-safe)
 197   (:translate make-fdefn)
 198   (:args (name :scs (descriptor-reg) :to :eval))
 199   (:results (result :scs (descriptor-reg) :from :argument))
 200   (:node-var node)
 201   (:generator 37
 202     (with-fixed-allocation (result fdefn-widetag fdefn-size node)
 203       (storew name result fdefn-name-slot other-pointer-lowtag)
 204       (storew nil-value result fdefn-fun-slot other-pointer-lowtag)
 205       (storew (make-fixup "undefined_tramp" :foreign)
 206               result fdefn-raw-addr-slot other-pointer-lowtag))))
 207
 208 (define-vop (make-closure)
 209   (:args (function :to :save :scs (descriptor-reg)))
 210   (:info length stack-allocate-p)
 211   (:temporary (:sc any-reg) temp)
 212   (:results (result :scs (descriptor-reg)))
 213   (:node-var node)
 214   (:generator 10
 215    (maybe-pseudo-atomic stack-allocate-p
 216     (let ((size (+ length closure-info-offset)))
 217       (allocation result (pad-data-block size) node stack-allocate-p
 218                   fun-pointer-lowtag)
 219       (storew (logior (ash (1- size) n-widetag-bits) closure-header-widetag)
 220               result 0 fun-pointer-lowtag))
 221     (loadw temp function closure-fun-slot fun-pointer-lowtag)
 222     (storew temp result closure-fun-slot fun-pointer-lowtag))))
 223
 224 ;;; The compiler likes to be able to directly make value cells.
 225 (define-vop (make-value-cell)
 226   (:args (value :scs (descriptor-reg any-reg) :to :result))
 227   (:results (result :scs (descriptor-reg) :from :eval))
 228   (:info stack-allocate-p)
 229   (:node-var node)
 230   (:generator 10
 231     (with-fixed-allocation
 232         (result value-cell-header-widetag value-cell-size node stack-allocate-p)
 233       (storew value result value-cell-value-slot other-pointer-lowtag))))
 234 \f
 235 ;;;; automatic allocators for primitive objects
 236
 237 (define-vop (make-unbound-marker)
 238   (:args)
 239   (:results (result :scs (any-reg)))
 240   (:generator 1
 241     (inst mov result unbound-marker-widetag)))
 242
 243 (define-vop (make-funcallable-instance-tramp)
 244   (:args)
 245   (:results (result :scs (any-reg)))
 246   (:generator 1
 247     (inst lea result (make-fixup "funcallable_instance_tramp" :foreign))))
 248
 249 (define-vop (fixed-alloc)
 250   (:args)
 251   (:info name words type lowtag stack-allocate-p)
 252   (:ignore name)
 253   (:results (result :scs (descriptor-reg)))
 254   (:node-var node)
 255   (:generator 50
 256     (maybe-pseudo-atomic stack-allocate-p
 257      (allocation result (pad-data-block words) node stack-allocate-p lowtag)
 258      (when type
 259        (storew (logior (ash (1- words) n-widetag-bits) type)
 260                result
 261                0
 262                lowtag)))))
 263
 264 (define-vop (var-alloc)
 265   (:args (extra :scs (any-reg)))
 266   (:arg-types positive-fixnum)
 267   (:info name words type lowtag)
 268   (:ignore name)
 269   (:results (result :scs (descriptor-reg) :from (:eval 1)))
 270   (:temporary (:sc any-reg :from :eval :to (:eval 1)) bytes)
 271   (:temporary (:sc any-reg :from :eval :to :result) header)
 272   (:node-var node)
 273   (:generator 50
 274     (inst lea bytes
 275           (make-ea :qword :base extra :disp (* (1+ words) n-word-bytes)))
 276     (inst mov header bytes)
 277     (inst shl header (- n-widetag-bits 3)) ; w+1 to length field
 278     (inst lea header                    ; (w-1 << 8) | type
 279           (make-ea :qword :base header :disp (+ (ash -2 n-widetag-bits) type)))
 280     (inst and bytes (lognot lowtag-mask))
 281     (pseudo-atomic
 282      (allocation result bytes node)
 283      (inst lea result (make-ea :byte :base result :disp lowtag))
 284      (storew header result 0 lowtag))))
 285
 286 (define-vop (%make-symbol)
 287   (:policy :fast-safe)
 288   (:translate %make-symbol)
 289   (:args (name :scs (descriptor-reg) :to :eval))
 290   (:temporary (:sc unsigned-reg :from :eval) temp)
 291   (:results (result :scs (descriptor-reg) :from :argument))
 292   (:node-var node)
 293   (:generator 37
 294     (with-fixed-allocation (result symbol-header-widetag symbol-size node)
 295       (storew name result symbol-name-slot other-pointer-lowtag)
 296       (storew unbound-marker-widetag
 297               result
 298               symbol-value-slot
 299               other-pointer-lowtag)
 300       ;; Set up a random hash value for the symbol. Perhaps the object
 301       ;; address could be used for even faster and smaller code!
 302       ;; FIXME: We don't mind the symbol hash not being repeatable, so
 303       ;; we might as well add in the object address here, too. (Adding entropy
 304       ;; is good, even if ANSI doesn't understand that.)
 305       (inst imul temp
 306             (make-fixup "fast_random_state" :foreign)
 307             1103515245)
 308       (inst add temp 12345)
 309       (inst mov (make-fixup "fast_random_state" :foreign)
 310             temp)
 311       ;; We want a positive fixnum for the hash value, so discard the LS bits.
 312       ;;
 313       ;; FIXME: OK, who wants to tell me (CSR) why these two
 314       ;; instructions aren't replaced by (INST AND TEMP #x8FFFFFFC)?
 315       ;; Are the following two instructions actually faster?  Does the
 316       ;; difference in behaviour really matter?
 317       (inst shr temp 1)
 318       (inst and temp #xfffffffc)
 319       (storew temp result symbol-hash-slot other-pointer-lowtag)
 320       (storew nil-value result symbol-plist-slot other-pointer-lowtag)
 321       (storew nil-value result symbol-package-slot other-pointer-lowtag))))