src/compiler/mips/alloc.lisp

   1 ;;;; allocation VOPs for Mips
   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 (define-vop (list-or-list*)
  16   (:args (things :more t))
  17   (:temporary (:scs (descriptor-reg) :type list) ptr)
  18   (:temporary (:scs (descriptor-reg)) temp)
  19   (:temporary (:scs (descriptor-reg) :type list :to (:result 0) :target result)
  20               res)
  21   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
  22   (:info num)
  23   (:results (result :scs (descriptor-reg)))
  24   (:variant-vars star)
  25   (:policy :safe)
  26   (:node-var node)
  27   (:generator 0
  28     (cond ((zerop num)
  29            (move result null-tn))
  30           ((and star (= num 1))
  31            (move result (tn-ref-tn things)))
  32           (t
  33            (macrolet
  34                ((store-car (tn list &optional (slot cons-car-slot))
  35                   `(let ((reg
  36                           (sc-case ,tn
  37                             ((any-reg descriptor-reg zero null)
  38                              ,tn)
  39                             (control-stack
  40                              (load-stack-tn temp ,tn)
  41                              temp))))
  42                      (storew reg ,list ,slot list-pointer-lowtag))))
  43              (let* ((dx-p (node-stack-allocate-p node))
  44                     (cons-cells (if star (1- num) num))
  45                     (alloc (* (pad-data-block cons-size) cons-cells)))
  46                (pseudo-atomic (pa-flag :extra (if dx-p 0 alloc))
  47                  (when dx-p
  48                    (align-csp res))
  49                  (inst srl res (if dx-p csp-tn alloc-tn) n-lowtag-bits)
  50                  (inst sll res n-lowtag-bits)
  51                  (inst or res list-pointer-lowtag)
  52                  (when dx-p
  53                    (inst addu csp-tn alloc))
  54                  (move ptr res)
  55                  (dotimes (i (1- cons-cells))
  56                    (store-car (tn-ref-tn things) ptr)
  57                    (setf things (tn-ref-across things))
  58                    (inst addu ptr ptr (pad-data-block cons-size))
  59                    (storew ptr ptr
  60                            (- cons-cdr-slot cons-size)
  61                            list-pointer-lowtag))
  62                  (store-car (tn-ref-tn things) ptr)
  63                  (cond (star
  64                         (setf things (tn-ref-across things))
  65                         (store-car (tn-ref-tn things) ptr cons-cdr-slot))
  66                        (t
  67                         (storew null-tn ptr
  68                                 cons-cdr-slot list-pointer-lowtag)))
  69                  (aver (null (tn-ref-across things)))
  70                  (move result res))))))))
  71
  72 (define-vop (list list-or-list*)
  73   (:variant nil))
  74
  75 (define-vop (list* list-or-list*)
  76   (:variant t))
  77 \f
  78 ;;;; Special purpose inline allocators.
  79
  80 ;;; ALLOCATE-VECTOR
  81 (define-vop (allocate-vector-on-heap)
  82   (:args (type :scs (unsigned-reg))
  83          (length :scs (any-reg))
  84          (words :scs (any-reg)))
  85   (:arg-types positive-fixnum
  86               positive-fixnum
  87               positive-fixnum)
  88   (:temporary (:sc non-descriptor-reg) bytes)
  89   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
  90   (:results (result :scs (descriptor-reg) :from :load))
  91   (:policy :fast-safe)
  92   (:generator 100
  93     (inst addu bytes words (+ lowtag-mask
  94                               (* vector-data-offset n-word-bytes)))
  95     (inst srl bytes n-lowtag-bits)
  96     (inst sll bytes n-lowtag-bits)
  97     (pseudo-atomic (pa-flag)
  98       (inst or result alloc-tn other-pointer-lowtag)
  99       (inst addu alloc-tn bytes)
 100       (storew type result 0 other-pointer-lowtag)
 101       (storew length result vector-length-slot other-pointer-lowtag))))
 102
 103 (define-vop (allocate-vector-on-stack)
 104   (:args (type :scs (unsigned-reg))
 105          (length :scs (any-reg))
 106          (words :scs (any-reg)))
 107   (:arg-types positive-fixnum
 108               positive-fixnum
 109               positive-fixnum)
 110   (:temporary (:sc non-descriptor-reg) bytes)
 111   (:temporary (:sc non-descriptor-reg) temp)
 112   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
 113   (:results (result :scs (descriptor-reg) :from :load))
 114   (:policy :fast-safe)
 115   (:generator 100
 116     (inst addu bytes words (+ lowtag-mask
 117                               (* vector-data-offset n-word-bytes)))
 118     (inst srl bytes n-lowtag-bits)
 119     (inst sll bytes n-lowtag-bits)
 120     ;; FIXME: It would be good to check for stack overflow here.
 121     (pseudo-atomic (pa-flag)
 122       (align-csp temp)
 123       (inst or result csp-tn other-pointer-lowtag)
 124       (inst addu temp csp-tn (* vector-data-offset n-word-bytes))
 125       (inst addu csp-tn bytes)
 126       (storew type result 0 other-pointer-lowtag)
 127       (storew length result vector-length-slot other-pointer-lowtag)
 128       (let ((loop (gen-label)))
 129         (emit-label loop)
 130         (storew zero-tn temp 0)
 131         (inst bne temp csp-tn loop)
 132         (inst addu temp n-word-bytes))
 133       (align-csp temp))))
 134
 135 (define-vop (allocate-code-object)
 136   (:args (boxed-arg :scs (any-reg))
 137          (unboxed-arg :scs (any-reg)))
 138   (:results (result :scs (descriptor-reg)))
 139   (:temporary (:scs (non-descriptor-reg)) ndescr)
 140   (:temporary (:scs (any-reg) :from (:argument 0)) boxed)
 141   (:temporary (:scs (non-descriptor-reg) :from (:argument 1)) unboxed)
 142   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
 143   (:generator 100
 144     (inst li ndescr (lognot lowtag-mask))
 145     (inst addu boxed boxed-arg
 146           (fixnumize (1+ code-trace-table-offset-slot)))
 147     (inst and boxed ndescr)
 148     (inst srl unboxed unboxed-arg word-shift)
 149     (inst addu unboxed unboxed lowtag-mask)
 150     (inst and unboxed ndescr)
 151     (inst sll ndescr boxed (- n-widetag-bits word-shift))
 152     (inst or ndescr code-header-widetag)
 153
 154     (pseudo-atomic (pa-flag)
 155       (inst or result alloc-tn other-pointer-lowtag)
 156       (inst addu alloc-tn boxed)
 157       (storew ndescr result 0 other-pointer-lowtag)
 158       (storew unboxed result code-code-size-slot other-pointer-lowtag)
 159       (inst addu alloc-tn unboxed)
 160       (storew null-tn result code-entry-points-slot other-pointer-lowtag)
 161       (storew null-tn result code-debug-info-slot other-pointer-lowtag))))
 162
 163 (define-vop (make-fdefn)
 164   (:policy :fast-safe)
 165   (:translate make-fdefn)
 166   (:args (name :scs (descriptor-reg) :to :eval))
 167   (:temporary (:scs (non-descriptor-reg)) temp)
 168   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
 169   (:results (result :scs (descriptor-reg) :from :argument))
 170   (:generator 37
 171     (with-fixed-allocation (result pa-flag temp fdefn-widetag fdefn-size nil)
 172       (inst li temp (make-fixup "undefined_tramp" :foreign))
 173       (storew name result fdefn-name-slot other-pointer-lowtag)
 174       (storew null-tn result fdefn-fun-slot other-pointer-lowtag)
 175       (storew temp result fdefn-raw-addr-slot other-pointer-lowtag))))
 176
 177 (define-vop (make-closure)
 178   (:args (function :to :save :scs (descriptor-reg)))
 179   (:info length stack-allocate-p)
 180   (:temporary (:scs (non-descriptor-reg)) temp)
 181   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
 182   (:results (result :scs (descriptor-reg)))
 183   (:generator 10
 184     (let* ((size (+ length closure-info-offset))
 185            (alloc-size (pad-data-block size)))
 186       (pseudo-atomic (pa-flag :extra (if stack-allocate-p 0 alloc-size))
 187         (cond (stack-allocate-p
 188                (align-csp result)
 189                (inst srl result csp-tn n-lowtag-bits)
 190                (inst addu csp-tn alloc-size))
 191               (t
 192                (inst srl result alloc-tn n-lowtag-bits)))
 193         (inst sll result n-lowtag-bits)
 194         (inst or result fun-pointer-lowtag)
 195         (inst li temp (logior (ash (1- size) n-widetag-bits)
 196                               closure-header-widetag))
 197         (storew temp result 0 fun-pointer-lowtag)
 198         (storew function result closure-fun-slot fun-pointer-lowtag)))))
 199
 200 ;;; The compiler likes to be able to directly make value cells.
 201 (define-vop (make-value-cell)
 202   (:args (value :to :save :scs (descriptor-reg any-reg null zero)))
 203   (:temporary (:scs (non-descriptor-reg)) temp)
 204   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
 205   (:info stack-allocate-p)
 206   (:results (result :scs (descriptor-reg)))
 207   (:generator 10
 208     (with-fixed-allocation (result pa-flag temp value-cell-header-widetag
 209                             value-cell-size stack-allocate-p)
 210       (storew value result value-cell-value-slot other-pointer-lowtag))))
 211 \f
 212 ;;;; Automatic allocators for primitive objects.
 213
 214 (define-vop (make-unbound-marker)
 215   (:args)
 216   (:results (result :scs (any-reg)))
 217   (:generator 1
 218     (inst li result unbound-marker-widetag)))
 219
 220 (define-vop (make-funcallable-instance-tramp)
 221   (:args)
 222   (:results (result :scs (any-reg)))
 223   (:generator 1
 224     (inst li result (make-fixup "funcallable_instance_tramp" :foreign))))
 225
 226 (define-vop (fixed-alloc)
 227   (:args)
 228   (:info name words type lowtag stack-allocate-p)
 229   (:ignore name)
 230   (:results (result :scs (descriptor-reg)))
 231   (:temporary (:scs (non-descriptor-reg)) temp)
 232   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
 233   (:generator 4
 234     (pseudo-atomic (pa-flag :extra (if stack-allocate-p
 235                                        0
 236                                        (pad-data-block words)))
 237       (cond (stack-allocate-p
 238              (align-csp result)
 239              (inst or result csp-tn lowtag)
 240              (inst addu csp-tn (pad-data-block words)))
 241             (t
 242              ;; The pseudo-atomic bit in alloc-tn is set.  If the
 243              ;; lowtag also has a 1 bit in the same position, we're all
 244              ;; set.  Otherwise, we need to subtract the pseudo-atomic
 245              ;; bit.
 246              (inst or result alloc-tn (if (logbitp 0 lowtag) lowtag
 247                                                              (1- lowtag)))))
 248       (when type
 249         (inst li temp (logior (ash (1- words) n-widetag-bits) type))
 250         (storew temp result 0 lowtag)))))
 251
 252 (define-vop (var-alloc)
 253   (:args (extra :scs (any-reg)))
 254   (:arg-types positive-fixnum)
 255   (:info name words type lowtag)
 256   (:ignore name)
 257   (:results (result :scs (descriptor-reg)))
 258   (:temporary (:scs (any-reg)) bytes)
 259   (:temporary (:scs (non-descriptor-reg)) header)
 260   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
 261   (:generator 6
 262     (inst addu bytes extra (* (1+ words) n-word-bytes))
 263     (inst sll header bytes (- n-widetag-bits 2))
 264     (inst addu header header (+ (ash -2 n-widetag-bits) type))
 265     (inst srl bytes bytes n-lowtag-bits)
 266     (inst sll bytes bytes n-lowtag-bits)
 267     (pseudo-atomic (pa-flag)
 268       (inst or result alloc-tn lowtag)
 269       (storew header result 0 lowtag)
 270       (inst addu alloc-tn alloc-tn bytes))))
 271