39 lines
929 B
Factor
39 lines
929 B
Factor
! (c)2009 Joe Groff bsd license
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USING: accessors alien alien.c-types alien.data destructors kernel libc math ;
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IN: memory.piles
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TUPLE: pile
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{ underlying c-ptr }
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{ size integer }
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{ offset integer } ;
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ERROR: not-enough-pile-space pile ;
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M: pile dispose
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[ [ free ] when* f ] change-underlying drop ;
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: <pile> ( size -- pile )
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[ malloc ] keep 0 pile boa ;
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: pile-empty ( pile -- )
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0 >>offset drop ;
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: pile-alloc ( pile size -- alien )
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[
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[ [ ] [ size>> ] [ offset>> ] tri ] dip +
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< [ not-enough-pile-space ] [ drop ] if
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] [
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drop [ offset>> ] [ underlying>> ] bi <displaced-alien>
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] [
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[ + ] curry change-offset drop
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] 2tri ;
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: <pile-c-object> ( pile c-type -- alien )
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heap-size pile-alloc ; inline
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: <pile-c-array> ( pile n c-type -- alien )
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heap-size * pile-alloc ; inline
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: pile-align ( pile align -- pile )
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[ align ] curry change-offset ;
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