64 lines
1.7 KiB
Factor
64 lines
1.7 KiB
Factor
! Copyright (C) 2008, 2010 Slava Pestov, Daniel Ehrenberg.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors assocs combinators.short-circuit
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compiler.cfg.instructions compiler.cfg.rpo kernel namespaces
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sequences sets ;
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IN: compiler.cfg.write-barrier
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! This pass must run after GC check insertion and scheduling.
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SYMBOL: fresh-allocations
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SYMBOL: mutated-objects
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SYMBOL: copies
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: resolve-copy ( src -- dst )
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copies get ?at drop ;
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GENERIC: eliminate-write-barrier ( insn -- ? )
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: fresh-allocation ( vreg -- )
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fresh-allocations get adjoin ;
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M: ##allot eliminate-write-barrier
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dst>> fresh-allocation t ;
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: mutated-object ( vreg -- )
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resolve-copy mutated-objects get adjoin ;
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M: ##set-slot eliminate-write-barrier
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obj>> mutated-object t ;
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M: ##set-slot-imm eliminate-write-barrier
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obj>> mutated-object t ;
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: needs-write-barrier? ( insn -- ? )
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resolve-copy {
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[ fresh-allocations get in? not ]
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[ mutated-objects get in? ]
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} 1&& ;
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M: ##write-barrier eliminate-write-barrier
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src>> needs-write-barrier? ;
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M: ##write-barrier-imm eliminate-write-barrier
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src>> needs-write-barrier? ;
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M: gc-map-insn eliminate-write-barrier
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fresh-allocations get clear-set ;
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M: ##copy eliminate-write-barrier
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[ src>> resolve-copy ] [ dst>> ] bi copies get set-at t ;
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M: insn eliminate-write-barrier drop t ;
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: write-barriers-step ( insns -- insns' )
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HS{ } clone fresh-allocations namespaces:set
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HS{ } clone mutated-objects namespaces:set
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H{ } clone copies namespaces:set
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[ eliminate-write-barrier ] filter! ;
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: eliminate-write-barriers ( cfg -- )
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[ write-barriers-step ] simple-optimization ;
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