1 ! Copyright (C) 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs combinators compiler.cfg.predecessors
4 compiler.cfg.rpo deques dlists fry kernel locals math math.order
5 namespaces sequences sorting vectors ;
6 FROM: namespaces => set ;
7 IN: compiler.cfg.dominance
15 : dom-parent ( bb -- bb' ) dom-parents get at ;
19 : set-idom ( idom bb -- changed? )
20 dom-parents get maybe-set-at ;
22 : intersect ( finger1 finger2 -- bb )
23 2dup [ number>> ] compare {
24 { +gt+ [ [ dom-parent ] dip intersect ] }
25 { +lt+ [ dom-parent intersect ] }
29 : compute-idom ( bb -- idom )
30 predecessors>> [ dom-parent ] filter
31 [ ] [ intersect ] map-reduce ;
33 : iterate ( rpo -- changed? )
34 f [ [ compute-idom ] keep set-idom or ] reduce ;
36 : compute-dom-parents ( cfg -- )
37 H{ } clone dom-parents set
39 unclip dup set-idom drop '[ _ iterate ] loop ;
45 : dom-children ( bb -- seq ) dom-childrens get at ;
49 : compute-dom-children ( dom-parents -- dom-childrens )
50 H{ } clone [ '[ 2dup eq? [ 2drop ] [ _ push-at ] if ] assoc-each ] keep
51 [ [ number>> ] sort-with ] assoc-map ;
53 SYMBOLS: preorder maxpreorder ;
57 : pre-of ( bb -- n ) [ preorder get at ] [ -1/0. ] if* ;
59 : maxpre-of ( bb -- n ) [ maxpreorder get at ] [ 1/0. ] if* ;
63 : (compute-dfs) ( n bb -- n )
65 [ dupd preorder get set-at ]
66 [ dom-children [ (compute-dfs) ] each ]
67 [ dupd maxpreorder get set-at ]
70 : compute-dfs ( cfg -- )
71 H{ } clone preorder set
72 H{ } clone maxpreorder set
73 [ 0 ] dip entry>> (compute-dfs) drop ;
75 : compute-dominance ( cfg -- )
78 dom-parents get compute-dom-children dom-childrens set
79 ] [ compute-dfs ] bi ;
83 : needs-dominance ( cfg -- )
84 [ needs-predecessors ]
86 dup dominance-valid?>> [ drop ]
87 [ t >>dominance-valid? compute-dominance ] if
90 : dominates? ( bb1 bb2 -- ? )
91 swap [ pre-of ] [ [ pre-of ] [ maxpre-of ] bi ] bi* between? ;
93 :: breadth-first-order ( cfg -- bfo )
95 cfg post-order length <vector> :> accum
96 cfg entry>> work-list push-front
99 [ dom-children work-list push-all-front ] bi