95 lines
2.9 KiB
Factor
95 lines
2.9 KiB
Factor
! Copyright (C) 2008, 2010 Slava Pestov.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: accessors assocs binary-search combinators
|
|
combinators.short-circuit heaps kernel namespaces
|
|
sequences fry locals math math.order arrays sorting
|
|
compiler.utilities
|
|
compiler.cfg.linear-scan.live-intervals
|
|
compiler.cfg.linear-scan.allocation.spilling
|
|
compiler.cfg.linear-scan.allocation.splitting
|
|
compiler.cfg.linear-scan.allocation.state ;
|
|
IN: compiler.cfg.linear-scan.allocation
|
|
|
|
: active-positions ( new assoc -- )
|
|
[ active-intervals-for ] dip
|
|
'[ [ 0 ] dip reg>> _ add-use-position ] each ;
|
|
|
|
: inactive-positions ( new assoc -- )
|
|
[ [ inactive-intervals-for ] keep ] dip
|
|
'[
|
|
[ _ relevant-ranges intersect-live-ranges 1/0. or ] [ reg>> ] bi
|
|
_ add-use-position
|
|
] each ;
|
|
|
|
: register-status ( new -- free-pos )
|
|
dup free-positions
|
|
[ inactive-positions ] [ active-positions ] [ nip ] 2tri
|
|
>alist alist-max ;
|
|
|
|
: no-free-registers? ( result -- ? )
|
|
second 0 = ; inline
|
|
|
|
: assign-register ( new -- )
|
|
dup register-status {
|
|
{ [ dup no-free-registers? ] [ drop assign-blocked-register ] }
|
|
{ [ 2dup register-available? ] [ register-available ] }
|
|
[ drop assign-blocked-register ]
|
|
} cond ;
|
|
|
|
: spill-at-sync-point? ( sync-point live-interval -- ? )
|
|
! If the live interval has a definition at a keep-dst?
|
|
! sync-point, don't spill.
|
|
{
|
|
[ drop keep-dst?>> not ]
|
|
[ [ n>> ] dip find-use dup [ def-rep>> ] when not ]
|
|
} 2|| ;
|
|
|
|
: spill-at-sync-point ( sync-point live-interval -- ? )
|
|
2dup spill-at-sync-point?
|
|
[ swap n>> spill f ] [ 2drop t ] if ;
|
|
|
|
GENERIC: handle-progress* ( obj -- )
|
|
|
|
M: live-interval handle-progress* drop ;
|
|
|
|
M: sync-point handle-progress*
|
|
active-intervals get values
|
|
[ [ spill-at-sync-point ] with filter! drop ] with each ;
|
|
|
|
:: handle-progress ( n obj -- )
|
|
n progress set
|
|
n deactivate-intervals
|
|
obj handle-progress*
|
|
n activate-intervals ;
|
|
|
|
GENERIC: handle ( obj -- )
|
|
|
|
M: live-interval handle ( live-interval -- )
|
|
[ [ start>> ] keep handle-progress ] [ assign-register ] bi ;
|
|
|
|
M: sync-point handle ( sync-point -- )
|
|
[ n>> ] keep handle-progress ;
|
|
|
|
: smallest-heap ( heap1 heap2 -- heap )
|
|
! If heap1 and heap2 have the same key, favors heap1.
|
|
{
|
|
{ [ dup heap-empty? ] [ drop ] }
|
|
{ [ over heap-empty? ] [ nip ] }
|
|
[ [ [ heap-peek nip ] bi@ <= ] most ]
|
|
} cond ;
|
|
|
|
: (allocate-registers) ( -- )
|
|
unhandled-intervals get unhandled-sync-points get smallest-heap
|
|
dup heap-empty? [ drop ] [ heap-pop drop handle (allocate-registers) ] if ;
|
|
|
|
: finish-allocation ( -- )
|
|
active-intervals inactive-intervals
|
|
[ get values [ handled-intervals get push-all ] each ] bi@ ;
|
|
|
|
: allocate-registers ( live-intervals sync-point machine-registers -- live-intervals )
|
|
init-allocator
|
|
init-unhandled
|
|
(allocate-registers)
|
|
finish-allocation
|
|
handled-intervals get ;
|