53 lines
1.3 KiB
Factor
53 lines
1.3 KiB
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: fry accessors namespaces assocs deques search-deques
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dlists kernel sequences compiler.utilities words sets
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stack-checker.branches compiler.tree compiler.tree.def-use
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compiler.tree.combinators ;
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IN: compiler.tree.dead-code.liveness
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SYMBOL: work-list
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SYMBOL: live-values
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: live-value? ( value -- ? ) live-values get at ;
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: look-at-value ( values -- ) work-list get push-front ;
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: look-at-values ( values -- ) work-list get push-all-front ;
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: look-at-inputs ( node -- ) in-d>> look-at-values ;
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: init-dead-code ( -- )
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<hashed-dlist> work-list set
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H{ { +bottom+ f } } clone live-values set ;
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GENERIC: mark-live-values* ( node -- )
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: mark-live-values ( nodes -- nodes )
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dup [ mark-live-values* ] each-node ; inline
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M: node mark-live-values* drop ;
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GENERIC: compute-live-values* ( value node -- )
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M: node compute-live-values* 2drop ;
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: iterate-live-values ( value -- )
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dup live-values get key? [
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drop
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] [
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dup live-values get conjoin
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dup defined-by compute-live-values*
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] if ;
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: compute-live-values ( -- )
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work-list get [ iterate-live-values ] slurp-deque ;
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GENERIC: remove-dead-code* ( node -- node' )
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M: node remove-dead-code* ;
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: (remove-dead-code) ( nodes -- nodes' )
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[ remove-dead-code* ] map-flat ;
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