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lambda lifting
A program transformation to remove free variables. An
expression containing a free variable is replaced by a
function applied to that variable. E.g.
f x = g 3 where g y = y + x
x is a free variable of g so it is added as an extra argument:
f x = g 3 x where g y x = y + x
Functions like this with no free variables are known as
supercombinators and are traditionally given upper-case names
beginning with "$". This transformation tends to produce many
supercombinators of the form f x = g x which can be eliminated
by eta reduction and substitution. Changing the order of
the parameters may also allow more optimisations. References
to global (top-level) constants and functions are not
transformed to function parameters though they are technically
free variables.
A closely related technique is closure conversion. See also
Full laziness.
Try this search on OneLook / Google
Nearby terms:
lambda abstraction « lambda-calculus « lambda expression « lambda lifting » LambdaMOO » Lambda Prolog » lamer
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
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