src/compiler/arm/alloc.lisp

   1 ;;;; allocation VOPs for the ARM
   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 (define-vop (list-or-list*)
  15   (:args (things :more t :scs (control-stack)))
  16   (:temporary (:scs (descriptor-reg) :type list) ptr)
  17   (:temporary (:scs (any-reg)) temp)
  18   (:temporary (:scs (descriptor-reg) :type list :to (:result 0) :target result)
  19               res)
  20   (:temporary (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
  21   (:info num)
  22   (:results (result :scs (descriptor-reg)))
  23   (:variant-vars star)
  24   (:policy :fast-safe)
  25   (:node-var node)
  26   (:generator 0
  27     (cond ((zerop num)
  28            (move result null-tn))
  29           ((and star (= num 1))
  30            (move result (tn-ref-tn things)))
  31           (t
  32            (macrolet
  33                ((maybe-load (tn)
  34                   (once-only ((tn tn))
  35                     `(sc-case ,tn
  36                        ((any-reg descriptor-reg null)
  37                         ,tn)
  38                        (control-stack
  39                         (load-stack-tn temp ,tn)
  40                         temp)))))
  41              (let* ((cons-cells (if star (1- num) num))
  42                     (alloc (* (pad-data-block cons-size) cons-cells)))
  43                (pseudo-atomic (pa-flag)
  44                  (allocation res alloc list-pointer-lowtag
  45                              :flag-tn pa-flag
  46                              :stack-allocate-p (node-stack-allocate-p node))
  47                  (move ptr res)
  48                  (dotimes (i (1- cons-cells))
  49                    (storew (maybe-load (tn-ref-tn things)) ptr
  50                        cons-car-slot list-pointer-lowtag)
  51                    (setf things (tn-ref-across things))
  52                    (inst add ptr ptr (pad-data-block cons-size))
  53                    (storew ptr ptr
  54                        (- cons-cdr-slot cons-size)
  55                        list-pointer-lowtag))
  56                  (storew (maybe-load (tn-ref-tn things)) ptr
  57                      cons-car-slot list-pointer-lowtag)
  58                  (storew (if star
  59                              (maybe-load (tn-ref-tn (tn-ref-across things)))
  60                              null-tn)
  61                      ptr cons-cdr-slot list-pointer-lowtag))
  62                (move result res)))))))
  63
  64 (define-vop (list list-or-list*)
  65   (:variant nil))
  66
  67 (define-vop (list* list-or-list*)
  68   (:variant t))
  69 \f
  70 ;;;; Special purpose inline allocators.
  71 #!-gencgc
  72 (define-vop (allocate-code-object)
  73   (:args (boxed-arg :scs (any-reg))
  74          (unboxed-arg :scs (any-reg)))
  75   (:results (result :scs (descriptor-reg)))
  76   (:temporary (:scs (non-descriptor-reg)) ndescr)
  77   (:temporary (:scs (non-descriptor-reg)) size)
  78   (:temporary (:scs (any-reg) :from (:argument 0)) boxed)
  79   (:temporary (:scs (non-descriptor-reg)) unboxed)
  80   (:temporary (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
  81   (:generator 100
  82     (inst add boxed boxed-arg (fixnumize (1+ code-constants-offset)))
  83     (inst bic boxed boxed lowtag-mask)
  84     (inst mov unboxed (lsr unboxed-arg word-shift))
  85     (inst add unboxed unboxed lowtag-mask)
  86     (inst bic unboxed unboxed lowtag-mask)
  87     (inst mov ndescr (lsl boxed (- n-widetag-bits word-shift)))
  88     (inst orr ndescr ndescr code-header-widetag)
  89     (inst add size boxed unboxed)
  90     (pseudo-atomic (pa-flag)
  91       (allocation result size other-pointer-lowtag :flag-tn pa-flag)
  92       (storew ndescr result 0 other-pointer-lowtag)
  93       (storew unboxed-arg result code-code-size-slot other-pointer-lowtag)
  94       (storew null-tn result code-debug-info-slot other-pointer-lowtag))))
  95
  96 (define-vop (make-fdefn)
  97   (:args (name :scs (descriptor-reg) :to :eval))
  98   (:temporary (:scs (non-descriptor-reg)) temp)
  99   (:temporary (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
 100   (:results (result :scs (descriptor-reg) :from :argument))
 101   (:temporary (:sc interior-reg) lip)
 102   (:policy :fast-safe)
 103   (:translate make-fdefn)
 104   (:generator 37
 105     (let ((undefined-tramp-fixup (gen-label)))
 106       (with-fixed-allocation (result pa-flag fdefn-widetag fdefn-size)
 107         (inst load-from-label temp lip undefined-tramp-fixup)
 108         (storew name result fdefn-name-slot other-pointer-lowtag)
 109         (storew null-tn result fdefn-fun-slot other-pointer-lowtag)
 110         (storew temp result fdefn-raw-addr-slot other-pointer-lowtag))
 111       (assemble (*elsewhere*)
 112         (emit-label undefined-tramp-fixup)
 113         (inst word (make-fixup 'undefined-tramp :assembly-routine))))))
 114
 115 (define-vop (make-closure)
 116   (:args (function :to :save :scs (descriptor-reg)))
 117   (:info length stack-allocate-p)
 118   (:temporary (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
 119   (:results (result :scs (descriptor-reg)))
 120   (:generator 10
 121     (let* ((size (+ length closure-info-offset))
 122            (alloc-size (pad-data-block size)))
 123       (pseudo-atomic (pa-flag)
 124         (allocation result alloc-size
 125                     fun-pointer-lowtag
 126                     :flag-tn pa-flag
 127                     :stack-allocate-p stack-allocate-p)
 128         (load-immediate-word pa-flag
 129                              (logior
 130                               (ash (1- size) n-widetag-bits)
 131                               closure-header-widetag))
 132         (storew pa-flag result 0 fun-pointer-lowtag)
 133         (storew function result closure-fun-slot fun-pointer-lowtag)))))
 134
 135 ;;; The compiler likes to be able to directly make value cells.
 136 ;;;
 137 (define-vop (make-value-cell)
 138   (:args (value :to :save :scs (descriptor-reg any-reg)))
 139   (:temporary (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
 140   (:info stack-allocate-p)
 141   (:results (result :scs (descriptor-reg)))
 142   (:generator 10
 143     (with-fixed-allocation (result pa-flag value-cell-header-widetag
 144                             value-cell-size :stack-allocate-p stack-allocate-p)
 145       (storew value result value-cell-value-slot other-pointer-lowtag))))
 146 \f
 147 ;;;; Automatic allocators for primitive objects.
 148
 149 (define-vop (make-unbound-marker)
 150   (:args)
 151   (:results (result :scs (descriptor-reg any-reg)))
 152   (:generator 1
 153     (inst mov result unbound-marker-widetag)))
 154
 155 (define-vop (make-funcallable-instance-tramp)
 156   (:args)
 157   (:results (result :scs (any-reg)))
 158   (:temporary (:sc interior-reg) lip)
 159   (:generator 1
 160     (let ((fixup (gen-label)))
 161       (inst load-from-label result lip fixup)
 162       (assemble (*elsewhere*)
 163         (emit-label fixup)
 164         (inst word (make-fixup 'funcallable-instance-tramp :assembly-routine))))))
 165
 166 (define-vop (fixed-alloc)
 167   (:args)
 168   (:info name words type lowtag stack-allocate-p)
 169   (:ignore name)
 170   (:results (result :scs (descriptor-reg)))
 171   (:temporary (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
 172   (:generator 4
 173     (with-fixed-allocation (result pa-flag type words
 174                             :lowtag lowtag
 175                             :stack-allocate-p stack-allocate-p))))
 176
 177 (define-vop (var-alloc)
 178   (:args (extra :scs (any-reg)))
 179   (:arg-types positive-fixnum)
 180   (:info name words type lowtag)
 181   (:ignore name)
 182   (:results (result :scs (descriptor-reg)))
 183   (:temporary (:scs (any-reg)) bytes)
 184   (:temporary (:scs (non-descriptor-reg)) header)
 185   (:temporary (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
 186   (:generator 6
 187     ;; Build the object header, assuming that the header was in WORDS
 188     ;; but should not be in the header
 189     (inst add bytes extra (* (1- words) n-word-bytes))
 190     (inst mov header (lsl bytes (- n-widetag-bits n-fixnum-tag-bits)))
 191     (inst add header header type)
 192     ;; Add the object header to the allocation size and round up to
 193     ;; the allocation granularity
 194     (inst add bytes bytes (* 2 n-word-bytes))
 195     (inst bic bytes bytes lowtag-mask)
 196     ;; Allocate the object and set its header
 197     (pseudo-atomic (pa-flag)
 198       (allocation result bytes lowtag :flag-tn pa-flag)
 199       (storew header result 0 lowtag))))