76 lines
2.8 KiB
Factor
76 lines
2.8 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: stack
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USE: kernel
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USE: vectors
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: datastack* ( -- datastack )
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interpreter "factor.FactorInterpreter" "datastack" jvar-get ;
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: datastack ( -- datastack )
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datastack* clone ; interpret-only
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: set-datastack* ( datastack -- ... )
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interpreter "factor.FactorInterpreter" "datastack" jvar-set ;
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: set-datastack ( datastack -- ... )
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clone set-datastack* ; interpret-only
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: callstack* ( -- callstack )
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interpreter "factor.FactorInterpreter" "callstack" jvar-get ;
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: callstack ( -- callstack )
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callstack*
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! When 'clone' is interpreted, 'call' pushes a call frame
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! which is replaced by 'clone' due to tail call optimization.
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! When 'clone' is compiled, 'call' pushes a call frame, which
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! is not affected by 'clone'.
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! In both cases, the call stack has a frame from 'call' and
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! a frame from 'callstack', and we pop both off so that
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! callstack pushes the callstack as it was in the calling
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! word.
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[ clone ] call
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dup vector-pop drop
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dup vector-pop drop ; interpret-only
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: set-callstack* ( callstack -- ... )
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interpreter "factor.FactorInterpreter" "callstack" jvar-set ;
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: set-callstack ( callstack -- ... )
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clone set-callstack* ; interpret-only
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: clear ( -- )
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#! Clear the datastack. For interactive use only; invoking
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#! this from a word definition will clobber any values left
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#! on the data stack by the caller.
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datastack* vector-clear ;
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: depth ( -- n )
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#! Push the number of elements on the datastack.
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datastack vector-length ;
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