1 ! Copyright (C) 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs combinators compiler.cfg
4 compiler.cfg.instructions compiler.cfg.parallel-copy
5 compiler.cfg.registers compiler.cfg.stacks.height
6 fry hash-sets kernel make math math.order namespaces sequences sets ;
7 IN: compiler.cfg.stacks.local
9 : current-height ( state -- ds rs )
10 first2 [ first ] bi@ ;
12 : >loc< ( loc -- n ds? )
13 [ n>> ] [ ds-loc? ] bi ;
15 : modify-height ( state loc -- )
16 >loc< 0 1 ? rot nth [ + ] with map! drop ;
18 : adjust ( state loc -- )
19 >loc< 0 1 ? rot nth dup first swapd + 0 rot set-nth ;
21 : reset-emits ( state -- )
22 [ 0 1 rot set-nth ] each ;
24 : height-state>insns ( state -- insns )
25 [ second ] map { ds-loc rs-loc } [ new swap >>n ] 2map
26 [ n>> 0 = ] reject [ ##inc new swap >>loc ] map ;
28 : translate-local-loc ( loc state -- loc' )
29 [ clone ] dip over >loc< 0 1 ? rot nth first - >>n ;
31 : clone-height-state ( state -- state' )
34 : initial-height-state ( -- state )
35 { { 0 0 } { 0 0 } } clone-height-state ;
37 : kill-locations ( saved-height height -- seq )
38 dupd [-] iota [ swap - ] with map ;
40 : local-kill-set ( ds-height rs-height state -- set )
41 current-height swapd [ kill-locations ] 2bi@
42 [ [ <ds-loc> ] map ] [ [ <rs-loc> ] map ] bi*
45 SYMBOLS: height-state peek-sets replace-sets kill-sets locs>vregs ;
47 : inc-stack ( loc -- )
48 height-state get swap modify-height ;
50 : loc>vreg ( loc -- vreg ) locs>vregs get [ drop next-vreg ] cache ;
51 : vreg>loc ( vreg -- loc/f ) locs>vregs get value-at ;
53 SYMBOLS: local-peek-set replaces ;
55 : replaces>copy-insns ( replaces -- insns )
56 [ [ loc>vreg ] dip ] assoc-map parallel-copy ;
58 : changes>insns ( replaces height-state -- insns )
59 [ replaces>copy-insns ] [ height-state>insns ] bi* append ;
61 : emit-changes ( replaces state -- )
62 building get pop -rot changes>insns % , ;
64 : peek-loc ( loc -- vreg )
65 height-state get translate-local-loc dup replaces get at
66 [ ] [ dup local-peek-set get adjoin loc>vreg ] ?if ;
68 : replace-loc ( vreg loc -- )
69 height-state get translate-local-loc replaces get set-at ;
71 : compute-local-kill-set ( basic-block -- set )
72 [ ds-heights get at ] [ rs-heights get at ] bi
73 height-state get local-kill-set ;
75 : begin-local-analysis ( basic-block -- )
76 height-state get dup reset-emits
77 current-height rot record-stack-heights
78 HS{ } clone local-peek-set set
79 H{ } clone replaces set ;
81 : remove-redundant-replaces ( replaces -- replaces' )
82 [ [ loc>vreg ] dip = ] assoc-reject ;
84 : end-local-analysis ( basic-block -- )
86 replaces get remove-redundant-replaces
87 dup height-state get emit-changes keys
88 swap replace-sets get set-at
90 [ [ local-peek-set get ] dip peek-sets get set-at ]
91 [ [ compute-local-kill-set ] keep kill-sets get set-at ] tri ;