46 lines
1.6 KiB
Factor
46 lines
1.6 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.checker compiler.cfg
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compiler.cfg.instructions compiler.cfg.predecessors compiler.cfg.rpo
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compiler.cfg.stacks.global compiler.cfg.stacks.height
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compiler.cfg.stacks.local compiler.cfg.utilities fry kernel
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locals make math sequences ;
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IN: compiler.cfg.stacks.finalize
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:: inserting-peeks ( from to -- assoc )
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to anticip-in
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from anticip-out from avail-out assoc-union
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assoc-diff ;
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:: inserting-replaces ( from to -- assoc )
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from pending-out to pending-in assoc-diff
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to dead-in to live-in to anticip-in assoc-diff assoc-diff
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assoc-diff ;
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: each-insertion ( ... assoc bb quot: ( ... vreg loc -- ... ) -- ... )
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'[ drop [ loc>vreg ] [ _ untranslate-loc ] bi @ ] assoc-each ; inline
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ERROR: bad-peek dst loc ;
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: insert-peeks ( from to -- )
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[ inserting-peeks ] keep
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[ dup n>> 0 < [ bad-peek ] [ ##peek, ] if ] each-insertion ;
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: insert-replaces ( from to -- )
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[ inserting-replaces ] keep
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[ dup n>> 0 < [ 2drop ] [ ##replace, ] if ] each-insertion ;
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: visit-edge ( from to -- )
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! If both blocks are subroutine calls, don't bother
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! computing anything.
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2dup [ kill-block?>> ] both? [ 2drop ] [
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2dup [ [ insert-replaces ] [ insert-peeks ] 2bi ##branch, ] V{ } make
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[ 2drop ] [ insert-basic-block ] if-empty
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] if ;
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: visit-block ( bb -- )
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[ predecessors>> ] keep '[ _ visit-edge ] each ;
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: finalize-stack-shuffling ( cfg -- )
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[ [ visit-block ] each-basic-block ] [ cfg-changed ] bi ;
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