36 lines
948 B
Factor
36 lines
948 B
Factor
! Copyright (C) 2008, 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel accessors namespaces make math sequences sets
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assocs fry compiler.cfg compiler.cfg.instructions ;
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IN: compiler.cfg.rpo
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SYMBOL: visited
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: post-order-traversal ( bb -- )
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dup visited get key? [ drop ] [
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dup visited get conjoin
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[
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successors>> <reversed>
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[ post-order-traversal ] each
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] [ , ] bi
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] if ;
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: number-blocks ( blocks -- )
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dup length iota <reversed>
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[ >>number drop ] 2each ;
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: post-order ( cfg -- blocks )
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dup post-order>> [ ] [
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[
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H{ } clone visited set
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dup entry>> post-order-traversal
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] { } make dup number-blocks
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>>post-order post-order>>
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] ?if ;
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: reverse-post-order ( cfg -- blocks )
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post-order <reversed> ; inline
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: each-basic-block ( cfg quot -- )
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[ reverse-post-order ] dip each ; inline
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