69 lines
2.4 KiB
Factor
69 lines
2.4 KiB
Factor
! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2003, 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: kernel
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USE: errors
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USE: kernel
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USE: lists
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USE: namespaces
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USE: 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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