50 lines
1.4 KiB
Factor
50 lines
1.4 KiB
Factor
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! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel accessors namespaces math layouts sequences locals
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combinators compiler.vops compiler.vops.builder
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compiler.cfg.builder ;
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IN: compiler.cfg.elaboration
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! This pass must run before conversion to machine IR to ensure
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! correctness.
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GENERIC: elaborate* ( insn -- )
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: slot-shift ( -- n )
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tag-bits get cell log2 - ;
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:: compute-slot-known-tag ( insn -- addr )
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{ $1 $2 $3 $4 $5 } temps
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init-intrinsic
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$1 slot-shift %iconst emit ! load shift offset
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$2 insn slot>> $1 %shr emit ! shift slot by shift offset
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$3 insn tag>> %iconst emit ! load tag number
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$4 $2 $3 %isub emit
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$5 insn obj>> $4 %iadd emit ! compute slot offset
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$5
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;
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:: compute-slot-any-tag ( insn -- addr )
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{ $1 $2 $3 $4 } temps
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init-intrinsic
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$1 insn obj>> emit-untag ! untag object
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$2 slot-shift %iconst emit ! load shift offset
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$3 insn slot>> $2 %shr emit ! shift slot by shift offset
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$4 $1 $3 %iadd emit ! compute slot offset
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$4
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;
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: compute-slot ( insn -- addr )
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dup tag>> [ compute-slot-known-tag ] [ compute-slot-any-tag ] if ;
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M: %%slot elaborate*
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[ out>> ] [ compute-slot ] bi %load emit ;
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M: %%set-slot elaborate*
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[ in>> ] [ compute-slot ] bi %store emit ;
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M: object elaborate* , ;
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: elaboration ( insns -- insns )
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[ [ elaborate* ] each ] { } make ;
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