1 ! Copyright (C) 2009 Slava Pestov.
2 ! See https://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs combinators compiler.cfg.predecessors
4 compiler.cfg.rpo deques dlists kernel math math.order
5 namespaces sequences sorting vectors ;
6 IN: compiler.cfg.dominance
14 : dom-parent ( bb -- bb' ) dom-parents get at ;
18 : set-idom ( idom bb -- changed? )
19 dom-parents get maybe-set-at ;
21 : intersect ( finger1 finger2 -- bb )
22 2dup [ number>> ] compare {
23 { +gt+ [ [ dom-parent ] dip intersect ] }
24 { +lt+ [ dom-parent intersect ] }
28 : compute-idom ( bb -- idom )
29 predecessors>> [ dom-parent ] filter
30 [ ] [ intersect ] map-reduce ;
32 : iterate ( rpo -- changed? )
33 f [ [ compute-idom ] keep set-idom or ] reduce ;
35 : compute-dom-parents ( cfg -- )
36 H{ } clone dom-parents set
38 unclip dup set-idom drop '[ _ iterate ] loop ;
44 : dom-children ( bb -- seq ) dom-childrens get at ;
48 : compute-dom-children ( dom-parents -- dom-childrens )
49 H{ } clone [ '[ 2dup eq? [ 2drop ] [ _ push-at ] if ] assoc-each ] keep
50 [ [ number>> ] sort-by ] assoc-map ;
52 SYMBOLS: preorder maxpreorder ;
56 : pre-of ( bb -- n ) [ preorder get at ] [ -1/0. ] if* ;
58 : maxpre-of ( bb -- n ) [ maxpreorder get at ] [ 1/0. ] if* ;
62 : (compute-dfs) ( n bb -- n )
64 [ dupd preorder get set-at ]
65 [ dom-children [ (compute-dfs) ] each ]
66 [ dupd maxpreorder get set-at ]
69 : compute-dfs ( cfg -- )
70 H{ } clone preorder set
71 H{ } clone maxpreorder set
72 [ 0 ] dip entry>> (compute-dfs) drop ;
74 : compute-dominance ( cfg -- )
77 dom-parents get compute-dom-children dom-childrens set
78 ] [ compute-dfs ] bi ;
82 : needs-dominance ( cfg -- )
83 [ needs-predecessors ]
85 dup dominance-valid?>> [ drop ]
86 [ t >>dominance-valid? compute-dominance ] if
89 : dominates? ( bb1 bb2 -- ? )
90 swap [ pre-of ] [ [ pre-of ] [ maxpre-of ] bi ] bi* between? ;
92 :: breadth-first-order ( cfg -- bfo )
94 cfg post-order length <vector> :> accum
95 cfg entry>> work-list push-front
98 [ dom-children work-list push-all-front ] bi