44 lines
1.2 KiB
Factor
44 lines
1.2 KiB
Factor
! Copyright (C) 2008, 2009 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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SYMBOL: fresh-allocations
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SYMBOL: mutated-objects
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GENERIC: eliminate-write-barrier ( insn -- ? )
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M: ##allot eliminate-write-barrier
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dst>> fresh-allocations get conjoin t ;
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M: ##set-slot eliminate-write-barrier
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obj>> mutated-objects get conjoin t ;
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M: ##set-slot-imm eliminate-write-barrier
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obj>> mutated-objects get conjoin t ;
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: needs-write-barrier? ( insn -- ? )
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{ [ fresh-allocations get key? not ] [ mutated-objects get key? ] } 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: ##copy eliminate-write-barrier
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"Run copy propagation first" throw ;
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M: insn eliminate-write-barrier drop t ;
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: write-barriers-step ( bb -- )
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H{ } clone fresh-allocations set
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H{ } clone mutated-objects set
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instructions>> [ eliminate-write-barrier ] filter! drop ;
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: eliminate-write-barriers ( cfg -- cfg' )
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dup [ write-barriers-step ] each-basic-block ;
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