45 lines
1.3 KiB
Factor
45 lines
1.3 KiB
Factor
! Copyright (C) 2008, 2009 Slava Pestov, Daniel Ehrenberg.
|
|
! See http://factorcode.org/license.txt for BSD license.
|
|
USING: accessors assocs combinators.short-circuit
|
|
compiler.cfg.instructions compiler.cfg.rpo kernel namespaces
|
|
sequences sets ;
|
|
FROM: namespaces => set ;
|
|
IN: compiler.cfg.write-barrier
|
|
|
|
SYMBOL: fresh-allocations
|
|
|
|
SYMBOL: mutated-objects
|
|
|
|
GENERIC: eliminate-write-barrier ( insn -- ? )
|
|
|
|
M: ##allot eliminate-write-barrier
|
|
dst>> fresh-allocations get conjoin t ;
|
|
|
|
M: ##set-slot eliminate-write-barrier
|
|
obj>> mutated-objects get conjoin t ;
|
|
|
|
M: ##set-slot-imm eliminate-write-barrier
|
|
obj>> mutated-objects get conjoin t ;
|
|
|
|
: needs-write-barrier? ( insn -- ? )
|
|
{ [ fresh-allocations get key? not ] [ mutated-objects get key? ] } 1&& ;
|
|
|
|
M: ##write-barrier eliminate-write-barrier
|
|
src>> needs-write-barrier? ;
|
|
|
|
M: ##write-barrier-imm eliminate-write-barrier
|
|
src>> needs-write-barrier? ;
|
|
|
|
M: ##copy eliminate-write-barrier
|
|
"Run copy propagation first" throw ;
|
|
|
|
M: insn eliminate-write-barrier drop t ;
|
|
|
|
: write-barriers-step ( bb -- )
|
|
H{ } clone fresh-allocations set
|
|
H{ } clone mutated-objects set
|
|
instructions>> [ eliminate-write-barrier ] filter! drop ;
|
|
|
|
: eliminate-write-barriers ( cfg -- cfg' )
|
|
dup [ write-barriers-step ] each-basic-block ;
|