81 lines
2.3 KiB
Factor
81 lines
2.3 KiB
Factor
! Copyright (C) 2004, 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: compiler
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USING: assembler errors kernel lists math namespaces strings
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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-prop set-word-xt ;
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: commit-xts ( -- )
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#! We must flush the instruction cache on PowerPC.
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flush-icache
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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 [ word-xt ] ?unless ;
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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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