! :folding=indent:collapseFolds=1:

! $Id$
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! Copyright (C) 2003, 2004 Slava Pestov.
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IN: stack
USE: kernel
USE: vectors

: datastack* ( -- datastack )
    interpreter "factor.FactorInterpreter" "datastack" jvar-get ;

: datastack ( -- datastack )
    datastack* clone ; interpret-only

: set-datastack* ( datastack -- ... )
    interpreter "factor.FactorInterpreter" "datastack" jvar-set ;

: set-datastack ( datastack -- ... )
    clone set-datastack* ; interpret-only

: callstack* ( -- callstack )
    interpreter "factor.FactorInterpreter" "callstack" jvar-get ;

: callstack ( -- callstack )
    callstack*
    ! When 'clone' is interpreted, 'call' pushes a call frame
    ! which is replaced by 'clone' due to tail call optimization.
    ! When 'clone' is compiled, 'call' pushes a call frame, which
    ! is not affected by 'clone'.
    ! In both cases, the call stack has a frame from 'call' and
    ! a frame from 'callstack', and we pop both off so that
    ! callstack pushes the callstack as it was in the calling
    ! word.
    [ clone ] call
    dup vector-pop drop
    dup vector-pop drop ; interpret-only

: set-callstack* ( callstack -- ... )
    interpreter "factor.FactorInterpreter" "callstack" jvar-set ;

: set-callstack ( callstack -- ... )
    clone set-callstack* ; interpret-only

: clear ( -- )
    #! Clear the datastack. For interactive use only; invoking
    #! this from a word definition will clobber any values left
    #! on the data stack by the caller.
    datastack* vector-clear ;