116 lines
3.5 KiB
Factor
116 lines
3.5 KiB
Factor
! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 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: compiler
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USE: inference
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USE: errors
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USE: hashtables
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USE: kernel
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USE: lists
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USE: math
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USE: namespaces
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USE: parser
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USE: prettyprint
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USE: stdio
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USE: strings
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USE: unparser
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USE: vectors
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USE: words
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! We use a hashtable "compiled-xts" that maps words to
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! xt's that are currently being compiled. The commit-xt's word
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! sets the xt of each word in the hashtable to the value in the
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! hastable.
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!
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! This has the advantage that we can compile a word before the
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! words it depends on and perform a fixup later; among other
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! things this enables mutually recursive words.
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SYMBOL: compiled-xts
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: save-xt ( word -- )
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compiled-offset swap compiled-xts [ acons ] change ;
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: commit-xt ( xt word -- )
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dup t "compiled" set-word-property set-word-xt ;
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: commit-xts ( -- )
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compiled-xts get [ unswons commit-xt ] each
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compiled-xts off ;
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: compiled-xt ( word -- xt )
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dup compiled-xts get assoc [ nip ] [ word-xt ] ifte* ;
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! "deferred-xts" is a list of [ where word relative ] pairs; the
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! xt of word when its done compiling will be written to the
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! offset, relative to the offset.
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SYMBOL: deferred-xts
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! Words being compiled are consed onto this list. When a word
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! is encountered that has not been previously compiled, it is
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! consed onto this list. Compilation stops when the list is
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! empty.
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SYMBOL: compile-words
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: defer-xt ( word where relative -- )
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#! After word is compiled, put its XT at where, relative.
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3list deferred-xts cons@ ;
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: compiling? ( word -- ? )
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#! A word that is compiling or already compiled will not be
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#! added to the list of words to be compiled.
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dup compiled? [
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drop t
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] [
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dup compile-words get contains? [
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drop t
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] [
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compiled-xts get assoc
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] ifte
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] ifte ;
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: fixup-deferred-xt ( word where relative -- )
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rot dup compiling? [
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compiled-xt swap - swap set-compiled-cell
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] [
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"Not compiled: " swap word-name cat2 throw
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] ifte ;
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: fixup-deferred-xts ( -- )
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deferred-xts get [
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uncons uncons car fixup-deferred-xt
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] each
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deferred-xts off ;
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: with-compiler ( quot -- )
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[ call fixup-deferred-xts commit-xts ] with-scope ;
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: postpone-word ( word -- )
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dup compiling? [ drop ] [ compile-words unique@ ] ifte ;
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