39 lines
1.2 KiB
Factor
39 lines
1.2 KiB
Factor
! Copyright (C) 2003, 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: kernel USING: errors lists namespaces vectors ;
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: reify ( quot -- )
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>r datastack >pop> callstack >pop> namestack catchstack
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r> call ;
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: (callcc) cons cons cons cons swap call ;
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: continue0 ( ds rs ns cs -- )
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set-catchstack set-namestack
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>r set-datastack r> set-callstack ;
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: callcc0 ( code -- )
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#! Calls the code with a special quotation at the top of the
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#! stack. The quotation has stack effect:
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#!
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#! ( -- ... )
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#!
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#! When called, the quotation restores execution state to
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#! the point after the callcc0 call.
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[ [ continue0 ] (callcc) ] reify ;
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: continue1 ( obj ds rs ns cs -- obj )
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set-catchstack set-namestack
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rot >r >r set-datastack r> r> swap set-callstack ;
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: callcc1 ( code -- )
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#! Calls the code with a special quotation at the top of the
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#! stack. The quotation has stack effect:
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#!
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#! ( X -- ... )
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#!
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#! When called, the quotation restores execution state to
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#! the point after the callcc1 call, and places X at the top
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#! of the original datastack.
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[ [ continue1 ] (callcc) ] reify ;
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