77 lines
1.9 KiB
Factor
77 lines
1.9 KiB
Factor
! Copyright (C) 2003, 2006 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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IN: kernel-internals
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USING: vectors ;
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: catchstack* ( -- catchstack )
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6 getenv { vector } declare ; inline
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IN: errors
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USING: kernel kernel-internals ;
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: catchstack ( -- catchstack ) catchstack* clone ; inline
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: set-catchstack ( catchstack -- ) >vector 6 setenv ; inline
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IN: kernel
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USING: arrays namespaces sequences ;
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TUPLE: continuation data retain call name catch ;
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: continuation ( -- continuation )
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datastack retainstack callstack namestack catchstack
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<continuation> ; inline
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: >continuation< ( continuation -- data retain call name catch )
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[ continuation-data ] keep
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[ continuation-retain ] keep
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[ continuation-call ] keep
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[ continuation-name ] keep
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continuation-catch ; inline
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: ifcc ( terminator balance -- )
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>r >r f [ continuation nip t ] call r> r> if ; inline
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: callcc0 ( quot -- ) [ ] ifcc ; inline
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: callcc1 ( quot -- obj ) callcc0 ; inline
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DEFER: continue-with
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: set-walker-hook 2 setenv ; inline
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: get-walker-hook 2 getenv f set-walker-hook ; inline
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: (continue) ( continuation -- )
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>continuation<
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set-catchstack
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set-namestack
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set-callstack
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set-retainstack
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set-datastack ; inline
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: (continue-with) ( obj continuation -- )
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#! There's no good way to avoid this code duplication!
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swap 9 setenv
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>continuation<
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set-catchstack
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set-namestack
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set-callstack
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set-retainstack
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set-datastack
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9 getenv swap ; inline
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: continue ( continuation -- )
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get-walker-hook [ (continue-with) ] [ (continue) ] if* ;
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inline
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: continue-with ( obj continuation -- )
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get-walker-hook [ >r 2array r> ] when* (continue-with) ;
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inline
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M: continuation clone
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[ continuation-data clone ] keep
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[ continuation-retain clone ] keep
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[ continuation-call clone ] keep
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[ continuation-name clone ] keep
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continuation-catch clone <continuation> ;
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