src/compiler/x86/alloc.lisp

   1 ;;;; allocation VOPs for the x86
   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 ;;;; LIST and LIST*
  15 (defoptimizer (list stack-allocate-result) ((&rest args))
  16   (not (null args)))
  17 (defoptimizer (list* stack-allocate-result) ((&rest args))
  18   (not (null (rest args))))
  19
  20 (define-vop (list-or-list*)
  21   (:args (things :more t))
  22   (:temporary (:sc unsigned-reg) ptr temp)
  23   (:temporary (:sc unsigned-reg :to (:result 0) :target result) res)
  24   (:info num)
  25   (:results (result :scs (descriptor-reg)))
  26   (:variant-vars star)
  27   (:policy :safe)
  28   (:node-var node)
  29   (:generator 0
  30     (cond ((zerop num)
  31            ;; (move result nil-value)
  32            (inst mov result nil-value))
  33           ((and star (= num 1))
  34            (move result (tn-ref-tn things)))
  35           (t
  36            (macrolet
  37                ((store-car (tn list &optional (slot cons-car-slot))
  38                   `(let ((reg
  39                           (sc-case ,tn
  40                             ((any-reg descriptor-reg) ,tn)
  41                             ((control-stack)
  42                              (move temp ,tn)
  43                              temp))))
  44                      (storew reg ,list ,slot list-pointer-lowtag))))
  45              (let ((cons-cells (if star (1- num) num)))
  46                (pseudo-atomic
  47                 (allocation res (* (pad-data-block cons-size) cons-cells) node
  48                             (awhen (sb!c::node-lvar node) (sb!c::lvar-dynamic-extent it)))
  49                 (inst lea res
  50                       (make-ea :byte :base res :disp list-pointer-lowtag))
  51                 (move ptr res)
  52                 (dotimes (i (1- cons-cells))
  53                   (store-car (tn-ref-tn things) ptr)
  54                   (setf things (tn-ref-across things))
  55                   (inst add ptr (pad-data-block cons-size))
  56                   (storew ptr ptr (- cons-cdr-slot cons-size)
  57                           list-pointer-lowtag))
  58                 (store-car (tn-ref-tn things) ptr)
  59                 (cond (star
  60                        (setf things (tn-ref-across things))
  61                        (store-car (tn-ref-tn things) ptr cons-cdr-slot))
  62                       (t
  63                        (storew nil-value ptr cons-cdr-slot
  64                                list-pointer-lowtag)))
  65                 (aver (null (tn-ref-across things)))))
  66              (move result res))))))
  67
  68 (define-vop (list list-or-list*)
  69   (:variant nil))
  70
  71 (define-vop (list* list-or-list*)
  72   (:variant t))
  73 \f
  74 ;;;; special-purpose inline allocators
  75
  76 ;;; ALLOCATE-VECTOR
  77 (define-vop (allocate-vector-on-heap)
  78   (:args (type :scs (unsigned-reg immediate))
  79          (length :scs (any-reg immediate))
  80          (words :scs (any-reg immediate)))
  81   (:results (result :scs (descriptor-reg) :from :load))
  82   (:arg-types positive-fixnum
  83               positive-fixnum
  84               positive-fixnum)
  85   (:policy :fast-safe)
  86   (:generator 100
  87     (let ((size (sc-case words
  88                   (immediate
  89                    (logandc2 (+ (fixnumize (tn-value words))
  90                                 (+ (1- (ash 1 n-lowtag-bits))
  91                                    (* vector-data-offset n-word-bytes)))
  92                              lowtag-mask))
  93                   (t
  94                    (inst lea result (make-ea :byte :base words :disp
  95                                              (+ (1- (ash 1 n-lowtag-bits))
  96                                                 (* vector-data-offset
  97                                                    n-word-bytes))))
  98                    (inst and result (lognot lowtag-mask))
  99                    result))))
 100       (pseudo-atomic
 101        (allocation result size)
 102        (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
 103        (sc-case type
 104          (immediate
 105           (aver (typep (tn-value type) '(unsigned-byte 8)))
 106           (storeb (tn-value type) result 0 other-pointer-lowtag))
 107          (t
 108           (storew type result 0 other-pointer-lowtag)))
 109        (sc-case length
 110          (immediate
 111           (let ((fixnum-length (fixnumize (tn-value length))))
 112             (typecase fixnum-length
 113               ((unsigned-byte 8)
 114                (storeb fixnum-length result
 115                        vector-length-slot other-pointer-lowtag))
 116               (t
 117                (storew fixnum-length result
 118                        vector-length-slot other-pointer-lowtag)))))
 119          (t
 120           (storew length result vector-length-slot other-pointer-lowtag)))))))
 121
 122 (define-vop (allocate-vector-on-stack)
 123   (:args (type :scs (unsigned-reg immediate))
 124          (length :scs (any-reg))
 125          (words :scs (any-reg) :target ecx))
 126   (:temporary (:sc any-reg :offset ecx-offset :from (:argument 2)) ecx)
 127   (:temporary (:sc any-reg :offset eax-offset :from (:argument 2)) zero)
 128   (:temporary (:sc any-reg :offset edi-offset :from (:argument 0)) res)
 129   (:results (result :scs (descriptor-reg) :from :load))
 130   (:arg-types positive-fixnum
 131               positive-fixnum
 132               positive-fixnum)
 133   (:translate allocate-vector)
 134   (:policy :fast-safe)
 135   (:node-var node)
 136   (:generator 100
 137     (inst lea result (make-ea :byte :base words :disp
 138                               (+ (1- (ash 1 n-lowtag-bits))
 139                                  (* vector-data-offset n-word-bytes))))
 140     (inst and result (lognot lowtag-mask))
 141     ;; FIXME: It would be good to check for stack overflow here.
 142     (move ecx words)
 143     (inst shr ecx n-fixnum-tag-bits)
 144     (allocation result result node t)
 145     (inst cld)
 146     (inst lea res
 147           (make-ea :byte :base result :disp (* vector-data-offset n-word-bytes)))
 148     (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
 149     (sc-case type
 150       (immediate
 151        (aver (typep (tn-value type) '(unsigned-byte 8)))
 152        (storeb (tn-value type) result 0 other-pointer-lowtag))
 153       (t
 154        (storew type result 0 other-pointer-lowtag)))
 155     (storew length result vector-length-slot other-pointer-lowtag)
 156     (inst xor zero zero)
 157     (inst rep)
 158     (inst stos zero)))
 159
 160 (in-package "SB!C")
 161
 162 (defoptimizer (allocate-vector stack-allocate-result)
 163     ((type length words) node)
 164   (ecase (policy node stack-allocate-vector)
 165     (0 nil)
 166     ((1 2)
 167      ;; a vector object should fit in one page
 168      (values-subtypep (lvar-derived-type words)
 169                       (load-time-value
 170                        (specifier-type `(integer 0 ,(- (/ sb!vm::*backend-page-size*
 171                                                           sb!vm:n-word-bytes)
 172                                                        sb!vm:vector-data-offset))))))
 173     (3 t)))
 174
 175 (defoptimizer (allocate-vector ltn-annotate) ((type length words) call ltn-policy)
 176   (let ((args (basic-combination-args call))
 177         (template (template-or-lose (if (awhen (node-lvar call)
 178                                           (lvar-dynamic-extent it))
 179                                         'sb!vm::allocate-vector-on-stack
 180                                         'sb!vm::allocate-vector-on-heap))))
 181     (dolist (arg args)
 182       (setf (lvar-info arg)
 183             (make-ir2-lvar (primitive-type (lvar-type arg)))))
 184     (unless (is-ok-template-use template call (ltn-policy-safe-p ltn-policy))
 185       (ltn-default-call call)
 186       (return-from allocate-vector-ltn-annotate-optimizer (values)))
 187     (setf (basic-combination-info call) template)
 188     (setf (node-tail-p call) nil)
 189
 190     (dolist (arg args)
 191       (annotate-1-value-lvar arg))))
 192
 193 (in-package "SB!VM")
 194
 195 ;;;
 196 (define-vop (allocate-code-object)
 197   (:args (boxed-arg :scs (any-reg) :target boxed)
 198          (unboxed-arg :scs (any-reg) :target unboxed))
 199   (:results (result :scs (descriptor-reg) :from :eval))
 200   (:temporary (:sc unsigned-reg :from (:argument 0)) boxed)
 201   (:temporary (:sc unsigned-reg :from (:argument 1)) unboxed)
 202   (:node-var node)
 203   (:generator 100
 204     (move boxed boxed-arg)
 205     (inst add boxed (fixnumize (1+ code-trace-table-offset-slot)))
 206     (inst and boxed (lognot lowtag-mask))
 207     (move unboxed unboxed-arg)
 208     (inst shr unboxed word-shift)
 209     (inst add unboxed lowtag-mask)
 210     (inst and unboxed (lognot lowtag-mask))
 211     (inst mov result boxed)
 212     (inst add result unboxed)
 213     (pseudo-atomic
 214      (allocation result result node)
 215      (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
 216      (inst shl boxed (- n-widetag-bits word-shift))
 217      (inst or boxed code-header-widetag)
 218      (storew boxed result 0 other-pointer-lowtag)
 219      (storew unboxed result code-code-size-slot other-pointer-lowtag)
 220      (storew nil-value result code-entry-points-slot other-pointer-lowtag))
 221     (storew nil-value result code-debug-info-slot other-pointer-lowtag)))
 222 \f
 223 (define-vop (make-fdefn)
 224   (:policy :fast-safe)
 225   (:translate make-fdefn)
 226   (:args (name :scs (descriptor-reg) :to :eval))
 227   (:results (result :scs (descriptor-reg) :from :argument))
 228   (:node-var node)
 229   (:generator 37
 230     (with-fixed-allocation (result fdefn-widetag fdefn-size node)
 231       (storew name result fdefn-name-slot other-pointer-lowtag)
 232       (storew nil-value result fdefn-fun-slot other-pointer-lowtag)
 233       (storew (make-fixup "undefined_tramp" :foreign)
 234               result fdefn-raw-addr-slot other-pointer-lowtag))))
 235
 236 (define-vop (make-closure)
 237   (:args (function :to :save :scs (descriptor-reg)))
 238   (:info length stack-allocate-p)
 239   (:temporary (:sc any-reg) temp)
 240   (:results (result :scs (descriptor-reg)))
 241   (:node-var node)
 242   (:generator 10
 243    (maybe-pseudo-atomic stack-allocate-p
 244      (let ((size (+ length closure-info-offset)))
 245        (allocation result (pad-data-block size) node
 246                    stack-allocate-p)
 247        (inst lea result
 248              (make-ea :byte :base result :disp fun-pointer-lowtag))
 249        (storew (logior (ash (1- size) n-widetag-bits) closure-header-widetag)
 250                result 0 fun-pointer-lowtag))
 251     (loadw temp function closure-fun-slot fun-pointer-lowtag)
 252     (storew temp result closure-fun-slot fun-pointer-lowtag))))
 253
 254 ;;; The compiler likes to be able to directly make value cells.
 255 (define-vop (make-value-cell)
 256   (:args (value :scs (descriptor-reg any-reg) :to :result))
 257   (:results (result :scs (descriptor-reg) :from :eval))
 258   (:info stack-allocate-p)
 259   (:node-var node)
 260   (:generator 10
 261     (with-fixed-allocation
 262         (result value-cell-header-widetag value-cell-size node stack-allocate-p)
 263       (storew value result value-cell-value-slot other-pointer-lowtag))))
 264 \f
 265 ;;;; automatic allocators for primitive objects
 266
 267 (define-vop (make-unbound-marker)
 268   (:args)
 269   (:results (result :scs (any-reg)))
 270   (:generator 1
 271     (inst mov result unbound-marker-widetag)))
 272
 273 (define-vop (make-funcallable-instance-tramp)
 274   (:args)
 275   (:results (result :scs (any-reg)))
 276   (:generator 1
 277     (inst lea result (make-fixup "funcallable_instance_tramp" :foreign))))
 278
 279 (define-vop (fixed-alloc)
 280   (:args)
 281   (:info name words type lowtag)
 282   (:ignore name)
 283   (:results (result :scs (descriptor-reg)))
 284   (:node-var node)
 285   (:generator 50
 286     ;; We special case the allocation of conses, because they're
 287     ;; extremely common and because the pseudo-atomic sequence on x86
 288     ;; is relatively heavyweight.  However, if the user asks for top
 289     ;; speed, we accomodate him.  The primary reason that we don't
 290     ;; also check for (< SPEED SPACE) is because we want the space
 291     ;; savings that these out-of-line allocation routines bring whilst
 292     ;; compiling SBCL itself.  --njf, 2006-07-08
 293     (if (and (= lowtag list-pointer-lowtag) (policy node (< speed 3)))
 294         (let ((dst
 295                #.(loop for offset in *dword-regs*
 296                     collect `(,offset
 297                               ',(intern (format nil "ALLOCATE-CONS-TO-~A"
 298                                                 (svref *dword-register-names*
 299                                                        offset)))) into cases
 300                     finally (return `(case (tn-offset result)
 301                                        ,@cases)))))
 302           (aver (null type))
 303           (inst call (make-fixup dst :assembly-routine)))
 304         (pseudo-atomic
 305          (allocation result (pad-data-block words) node)
 306          (inst lea result (make-ea :byte :base result :disp lowtag))
 307          (when type
 308            (storew (logior (ash (1- words) n-widetag-bits) type)
 309                    result
 310                    0
 311                    lowtag))))))
 312
 313 (define-vop (var-alloc)
 314   (:args (extra :scs (any-reg)))
 315   (:arg-types positive-fixnum)
 316   (:info name words type lowtag)
 317   (:ignore name)
 318   (:results (result :scs (descriptor-reg) :from (:eval 1)))
 319   (:temporary (:sc any-reg :from :eval :to (:eval 1)) bytes)
 320   (:temporary (:sc any-reg :from :eval :to :result) header)
 321   (:node-var node)
 322   (:generator 50
 323     (inst lea bytes
 324           (make-ea :dword :base extra :disp (* (1+ words) n-word-bytes)))
 325     (inst mov header bytes)
 326     (inst shl header (- n-widetag-bits 2)) ; w+1 to length field
 327     (inst lea header                    ; (w-1 << 8) | type
 328           (make-ea :dword :base header :disp (+ (ash -2 n-widetag-bits) type)))
 329     (inst and bytes (lognot lowtag-mask))
 330     (pseudo-atomic
 331      (allocation result bytes node)
 332      (inst lea result (make-ea :byte :base result :disp lowtag))
 333      (storew header result 0 lowtag))))