91 lines
2.8 KiB
Factor
91 lines
2.8 KiB
Factor
! Copyright (C) 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors assocs compiler.cfg.instructions
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compiler.cfg.parallel-copy compiler.cfg.registers
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compiler.cfg.stacks.height hash-sets kernel make math math.order
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namespaces sequences sets ;
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IN: compiler.cfg.stacks.local
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: current-height ( state -- ds rs )
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first2 [ first ] bi@ ;
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: >loc< ( loc -- n ds? )
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[ n>> ] [ ds-loc? ] bi ;
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: modify-height ( state loc -- )
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>loc< 0 1 ? rot nth [ + ] with map! drop ;
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: adjust ( state loc -- )
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>loc< 0 1 ? rot nth dup first swapd + 0 rot set-nth ;
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: reset-emits ( state -- )
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[ 0 1 rot set-nth ] each ;
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: height-state>insns ( state -- insns )
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[ second ] map { ds-loc rs-loc } [ new swap >>n ] 2map
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[ n>> 0 = ] reject [ ##inc new swap >>loc ] map ;
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: translate-local-loc ( loc state -- loc' )
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[ clone ] dip over >loc< 0 1 ? rot nth first - >>n ;
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: clone-height-state ( state -- state' )
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[ clone ] map ;
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: initial-height-state ( -- state )
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{ { 0 0 } { 0 0 } } clone-height-state ;
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: kill-locations ( saved-height height -- seq )
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dupd [-] iota [ swap - ] with map ;
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: local-kill-set ( ds-height rs-height state -- set )
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current-height swapd [ kill-locations ] 2bi@
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[ [ <ds-loc> ] map ] [ [ <rs-loc> ] map ] bi*
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append >hash-set ;
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SYMBOLS: height-state peek-sets replace-sets kill-sets locs>vregs ;
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: inc-stack ( loc -- )
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height-state get swap modify-height ;
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: loc>vreg ( loc -- vreg ) locs>vregs get [ drop next-vreg ] cache ;
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: vreg>loc ( vreg -- loc/f ) locs>vregs get value-at ;
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SYMBOLS: local-peek-set replaces ;
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: replaces>copy-insns ( replaces -- insns )
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[ [ loc>vreg ] dip ] assoc-map parallel-copy ;
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: changes>insns ( replaces height-state -- insns )
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[ replaces>copy-insns ] [ height-state>insns ] bi* append ;
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: emit-changes ( replaces state -- )
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building get pop -rot changes>insns % , ;
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: peek-loc ( loc -- vreg )
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height-state get translate-local-loc dup replaces get at
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[ ] [ dup local-peek-set get adjoin loc>vreg ] ?if ;
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: replace-loc ( vreg loc -- )
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height-state get translate-local-loc replaces get set-at ;
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: compute-local-kill-set ( basic-block -- set )
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[ ds-height>> ] [ rs-height>> ] bi height-state get local-kill-set ;
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: begin-local-analysis ( basic-block -- )
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height-state get dup reset-emits
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current-height rot record-stack-heights
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HS{ } clone local-peek-set namespaces:set
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H{ } clone replaces namespaces:set ;
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: remove-redundant-replaces ( replaces -- replaces' )
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[ [ loc>vreg ] dip = ] assoc-reject ;
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: end-local-analysis ( basic-block -- )
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[
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replaces get remove-redundant-replaces
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[ height-state get emit-changes ]
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[ keys >hash-set swap replace-sets get set-at ] bi
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]
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[ [ local-peek-set get ] dip peek-sets get set-at ]
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[ [ compute-local-kill-set ] keep kill-sets get set-at ] tri ;
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