ichimal / local-function Goto Github PK
View Code? Open in Web Editor NEWlocal-function: a variant of named-let with no-return feature
License: Other
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Insert LET layer into TAGBODY to prevent to capture loop variables directly
On current impl has capturing-loop-variable problem as below.
(mapcar #'funcall
(local-function fun ((x 3) acc)
(when (plusp x)
(no-return (fun
(1- x)
(cons (lambda () x) ; <- this is problem
acc ))))
acc )))
; => (0 0 0) ; sholud be (1 2 3)
Fix it.
invalid IGNORE/IGNORABLE declaration handling
For current code which closing previous issue #2, there is an new problem around IGNORE/IGNORABLE declaration.
e.g.
(local-function fun ((v1 ...) (v2 ...) ... (vk ...) vn)
(declare (type fixnum v1 v2 ... vk) (ignore vn))
... )
above code will be expanded to below;
(labels ((fun (#1=#:G1 #2=#:G2 ... #k=#:Gk #n=#:Gn)
(declare (type fixnum #1# #2# ... #k#)
(ignore #n#) )
(block fun
(tagbody #s=#:start-tag
(let ((v1 #1#) (v2 #2#) ... (vk #k#)
(vn #n#) )
(declare (type fixnum v1 v2 ... vk) (ignore vn))
... )))))
(fun ...) )
:Gn is declared as IGNORE, but it will be used as initial value of a following LET variable vn.
Is #:Gn declared as IGNORABLE?
Should vn be removed from internal LET and forbid to use vn?
Enbug around issue #1: cannot declare type of arguments (and so on)
Declaration to argments of local-function became impossible by fix code of isssue #1.
Refactor: handling lambda-list and its gensyms
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