1 ! Copyright (C) 2009, 2010 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors assocs combinators combinators.short-circuit
4 compiler.cfg.def-use compiler.cfg.instructions compiler.cfg.predecessors
5 compiler.cfg.registers compiler.cfg.rpo
6 compiler.cfg.ssa.destruction.leaders compiler.cfg.utilities
7 cpu.architecture deques dlists fry kernel locals namespaces
9 FROM: namespaces => set ;
10 IN: compiler.cfg.liveness
14 : live-in ( bb -- set )
19 : live-out ( bb -- set )
24 : edge-live-in ( predecessor basic-block -- set )
25 edge-live-ins get at at ;
29 GENERIC: visit-insn ( live-set insn -- )
31 ! This would be much better if live-set was a real set
32 : kill-defs ( live-set insn -- )
33 defs-vregs [ ?leader ] map
34 '[ drop ?leader _ in? ] assoc-reject! drop ; inline
36 : gen-uses ( live-set insn -- )
37 uses-vregs [ swap conjoin ] with each ; inline
39 M: vreg-insn visit-insn ( live-set insn -- )
40 [ kill-defs ] [ gen-uses ] 2bi ;
42 DEFER: lookup-base-pointer
44 GENERIC: lookup-base-pointer* ( vreg insn -- vreg/f )
46 M: ##tagged>integer lookup-base-pointer* nip src>> ;
48 M: ##unbox-any-c-ptr lookup-base-pointer*
49 ! If the input to unbox-any-c-ptr was an alien and not a
50 ! byte array, then the derived pointer will be outside of
51 ! the data heap. The GC has to handle this case and ignore
55 M: ##copy lookup-base-pointer* nip src>> lookup-base-pointer ;
57 M: ##add-imm lookup-base-pointer* nip src1>> lookup-base-pointer ;
59 M: ##sub-imm lookup-base-pointer* nip src1>> lookup-base-pointer ;
61 M: ##parallel-copy lookup-base-pointer* values>> value-at ;
63 M: ##add lookup-base-pointer*
64 ! If both operands have a base pointer, then the user better
65 ! not be doing memory reads and writes on the object, since
66 ! we don't give it a base pointer in that case at all.
67 nip [ src1>> ] [ src2>> ] bi [ lookup-base-pointer ] bi@ xor ;
69 M: ##sub lookup-base-pointer*
70 nip src1>> lookup-base-pointer ;
72 M: vreg-insn lookup-base-pointer* 2drop f ;
74 : lookup-base-pointer ( vreg -- vreg/f )
75 base-pointers get ?at [
76 f over base-pointers get set-at
77 [ dup ?leader insn-of lookup-base-pointer* ] keep
78 dupd base-pointers get set-at
81 :: visit-derived-root ( vreg derived-roots gc-roots -- )
82 vreg lookup-base-pointer :> base
84 { vreg base } derived-roots push
88 : visit-gc-root ( vreg derived-roots gc-roots -- )
90 { tagged-rep [ nip adjoin ] }
91 { int-rep [ visit-derived-root ] }
95 : gc-roots ( live-set -- derived-roots gc-roots )
96 keys V{ } clone HS{ } clone
97 [ '[ _ _ visit-gc-root ] each ] 2keep members ;
99 : fill-gc-map ( live-set gc-map -- )
100 [ gc-roots ] dip [ gc-roots<< ] [ derived-roots<< ] bi ;
102 M: gc-map-insn visit-insn ( live-set insn -- )
103 [ kill-defs ] [ gc-map>> fill-gc-map ] [ gen-uses ] 2tri ;
105 M: ##phi visit-insn kill-defs ;
107 M: insn visit-insn 2drop ;
109 : transfer-liveness ( live-set insns -- )
110 <reversed> [ visit-insn ] with each ;
112 : compute-live-in ( basic-block -- live-in )
113 [ live-out clone dup ] keep instructions>> transfer-liveness ;
115 : compute-edge-live-in ( basic-block -- edge-live-in )
117 '[ inputs>> [ swap _ conjoin-at ] assoc-each ] each-phi
120 : update-live-in ( basic-block -- changed? )
121 [ [ compute-live-in ] keep live-ins get maybe-set-at ]
122 [ [ compute-edge-live-in ] keep edge-live-ins get maybe-set-at ]
125 : compute-live-out ( basic-block -- live-out )
126 [ successors>> [ live-in ] map ]
127 [ dup successors>> [ edge-live-in ] with map ] bi
128 append assoc-combine ;
130 : update-live-out ( basic-block -- changed? )
131 [ compute-live-out ] keep
132 live-outs get maybe-set-at ;
134 : update-live-out/in ( basic-block -- changed? )
135 { [ update-live-out ] [ update-live-in ] } 1&& ;
137 : liveness-step ( basic-block -- basic-blocks )
138 [ update-live-out/in ] keep predecessors>> { } ? ;
140 : init-liveness ( -- )
141 H{ } clone live-ins set
142 H{ } clone edge-live-ins set
143 H{ } clone live-outs set
144 H{ } clone base-pointers set ;
146 : compute-live-sets ( cfg -- )
148 dup needs-predecessors dup compute-insns
149 post-order <hashed-dlist> [ push-all-front ] keep
150 [ liveness-step ] slurp/replenish-deque ;
152 : live-in? ( vreg bb -- ? ) live-in key? ;
154 : live-out? ( vreg bb -- ? ) live-out key? ;