Right now, strings are mutable, actually. But soon, they should be
immutable for Unicode-related reasons, so that may be a possibility.
Slava has opposed interning strings because it makes things more
complicated and initialization takes a little longer, but if we're
accepting auto-normalization, this wouldn't be worse.
It's possible to do a special case on a few particularly common
strings--just define them as constants, eg : stack_chain "stack_chain"
; but I don't know the specifics of the situation.
Daniel Ehrenberg
On 10/2/07, Samuel Tardieu <[EMAIL PROTECTED]> wrote:
> When looking at the output of "strings factor.image", I noticed that
> a few strings seem to be repeated a lot of time. I saved the result
> into "factor.strings" and ran:
>
> : count-into ( seq hash -- )
> [ [ [ drop 0 ] cache 1+ ] 2keep set-at ] curry each ;
>
> : count ( seq -- hash ) H{ } clone tuck count-into ;
>
> : items ( hash -- seq ) [ { } 2sequence ] { } assoc>map ;
>
> : sorted ( seq -- sortedseq ) [ second swap second <=> ] sort ;
>
> : analyze ( seq n -- seq ) >r count items sorted r> head ;
>
> "factor.strings" <file-reader> lines 10 analyze .
>
> It looks like those strings are present *a lot* of times in the image:
>
> {
> { "stack_chain" 1137 }
> { "cards_offset" 855 }
> { "alien_offset" 564 }
> { "nursery" 509 }
> { "simple_gc" 508 }
> { "to_cell" 416 }
> { "to_fixnum" 390 }
> { "PGe G" 150 }
> { "box_signed_4" 140 }
> { "to_double" 139 }
> }
>
> Wouldn't it be better to intern strings as is done in Java class
> files? Strings are immutable (as long as they are not passed to a
> foreign function).
>
> Sam
> --
> Samuel Tardieu -- [EMAIL PROTECTED] -- http://www.rfc1149.net/
>
>
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