1 ! Copyright (C) 2008, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs combinators compiler.cfg
4 compiler.cfg.linearization compiler.cfg.liveness compiler.cfg.registers
5 compiler.cfg.instructions compiler.cfg.linear-scan.allocation.state
6 compiler.cfg.linear-scan.live-intervals compiler.cfg.renaming.functor
7 compiler.cfg.ssa.destruction.leaders cpu.architecture
8 fry heaps kernel locals make math namespaces sequences sets ;
9 FROM: namespaces => set ;
10 IN: compiler.cfg.linear-scan.assignment
12 ! This contains both active and inactive intervals; any interval
13 ! such that start <= insn# <= end is in this set.
14 SYMBOL: pending-interval-heap
15 SYMBOL: pending-interval-assoc
17 : add-pending ( live-interval -- )
18 [ dup end>> pending-interval-heap get heap-push ]
19 [ [ reg>> ] [ vreg>> ] bi pending-interval-assoc get set-at ]
22 : remove-pending ( live-interval -- )
23 vreg>> pending-interval-assoc get delete-at ;
25 :: vreg>reg ( vreg -- reg )
27 leader pending-interval-assoc get at* [
28 drop leader vreg rep-of lookup-spill-slot
31 ERROR: not-spilled-error vreg ;
33 : vreg>spill-slot ( vreg -- spill-slot )
34 dup vreg>reg dup spill-slot? [ nip ] [ drop leader not-spilled-error ] if ;
36 : vregs>regs ( vregs -- assoc )
37 [ f ] [ [ dup vreg>reg ] H{ } map>assoc ] if-empty ;
39 SYMBOL: unhandled-intervals
41 : init-unhandled ( live-intervals -- unhandled-intervals )
42 [ dup start>> swap 2array ] map >min-heap ;
44 ! Liveness info is used by resolve pass
45 SYMBOL: machine-live-ins
47 : machine-live-in ( bb -- assoc )
48 machine-live-ins get at ;
50 : compute-live-in ( bb -- )
51 [ live-in keys vregs>regs ] keep machine-live-ins get set-at ;
53 ! Mapping from basic blocks to predecessors to values which are
54 ! live on a particular incoming edge
55 SYMBOL: machine-edge-live-ins
57 : machine-edge-live-in ( predecessor bb -- assoc )
58 machine-edge-live-ins get at at ;
60 : compute-edge-live-in ( bb -- )
61 [ edge-live-ins get at [ keys vregs>regs ] assoc-map ] keep
62 machine-edge-live-ins get set-at ;
64 SYMBOL: machine-live-outs
66 : machine-live-out ( bb -- assoc )
67 machine-live-outs get at ;
69 : compute-live-out ( bb -- )
70 [ live-out keys vregs>regs ] keep machine-live-outs get set-at ;
72 : init-assignment ( live-intervals -- )
73 init-unhandled unhandled-intervals set
74 <min-heap> pending-interval-heap set
75 H{ } clone pending-interval-assoc set
76 H{ } clone machine-live-ins set
77 H{ } clone machine-edge-live-ins set
78 H{ } clone machine-live-outs set ;
80 : insert-spill ( live-interval -- )
81 [ reg>> ] [ spill-rep>> ] [ spill-to>> ] tri ##spill, ;
83 : handle-spill ( live-interval -- )
84 dup spill-to>> [ insert-spill ] [ drop ] if ;
86 : expire-interval ( live-interval -- )
87 [ remove-pending ] [ handle-spill ] bi ;
89 : (expire-old-intervals) ( n heap -- )
90 dup heap-empty? [ 2drop ] [
91 2dup heap-peek nip <= [ 2drop ] [
92 dup heap-pop drop expire-interval
93 (expire-old-intervals)
97 : expire-old-intervals ( n -- )
98 pending-interval-heap get (expire-old-intervals) ;
100 : insert-reload ( live-interval -- )
101 [ reg>> ] [ reload-rep>> ] [ reload-from>> ] tri ##reload, ;
103 : handle-reload ( live-interval -- )
104 dup reload-from>> [ insert-reload ] [ drop ] if ;
106 : activate-interval ( live-interval -- )
107 [ add-pending ] [ handle-reload ] bi ;
109 : (activate-new-intervals) ( n heap -- )
110 dup heap-empty? [ 2drop ] [
111 2dup heap-peek nip = [
112 dup heap-pop drop activate-interval
113 (activate-new-intervals)
117 : activate-new-intervals ( n -- )
118 unhandled-intervals get (activate-new-intervals) ;
120 : prepare-insn ( n -- )
121 [ expire-old-intervals ] [ activate-new-intervals ] bi ;
123 GENERIC: assign-registers-in-insn ( insn -- )
125 RENAMING: assign [ vreg>reg ] [ vreg>reg ] [ vreg>reg ]
127 M: vreg-insn assign-registers-in-insn
128 [ assign-insn-defs ] [ assign-insn-uses ] [ assign-insn-temps ] tri ;
130 : assign-gc-roots ( gc-map -- )
131 [ [ vreg>spill-slot ] map ] change-gc-roots drop ;
133 : assign-derived-roots ( gc-map -- )
134 [ [ [ vreg>spill-slot ] bi@ ] assoc-map ] change-derived-roots drop ;
136 M: gc-map-insn assign-registers-in-insn
137 [ [ assign-insn-defs ] [ assign-insn-uses ] [ assign-insn-temps ] tri ]
138 [ gc-map>> [ assign-gc-roots ] [ assign-derived-roots ] bi ]
141 M: insn assign-registers-in-insn drop ;
143 : begin-block ( bb -- )
146 [ block-from activate-new-intervals ]
147 [ compute-edge-live-in ]
151 :: assign-registers-in-block ( bb -- )
157 [ insn#>> 1 - prepare-insn ]
158 [ insn#>> prepare-insn ]
159 [ assign-registers-in-insn ]
165 ] change-instructions drop ;
167 : assign-registers ( live-intervals cfg -- )
168 [ init-assignment ] dip
169 linearization-order [ kill-block?>> not ] filter
170 [ assign-registers-in-block ] each ;