[COMMIT] Improve #'defsubst* a little, document a bug that remains.
APPROVE COMMIT
NOTE: This patch has been committed.
# HG changeset patch
# User Aidan Kehoe <kehoea(a)parhasard.net>
# Date 1308506619 -3600
# Node ID 810b775624861e2fe6ea3b238370c6a3b840a4de
# Parent 544e6336d37cbafad876c7a838a072bf1af6dce4
Improve #'defsubst* a little, document a bug that remains.
2011-06-19 Aidan Kehoe <kehoea(a)parhasard.net>
* cl-macs.el (defsubst*):
* cl-macs.el (cl-defsubst-expand):
If defaults refer to earlier args, or if there's a &rest arg, use
#'proclaim-inline.
Use #'symbol-macrolet instead of #'subst when replacing argument
names with their values in the inline expansion; this avoids
(most) instances where the symbol's function slot is used.
Document a bug that occurs if the symbol is being shadowed in a
lexically-contained scope.
diff -r 544e6336d37c -r 810b77562486 lisp/ChangeLog
--- a/lisp/ChangeLog Sun Jun 19 17:43:03 2011 +0100
+++ b/lisp/ChangeLog Sun Jun 19 19:03:39 2011 +0100
＠＠ -1,3 +1,15 ＠＠
+2011-06-19 Aidan Kehoe <kehoea(a)parhasard.net>
+
+ * cl-macs.el (defsubst*):
+ * cl-macs.el (cl-defsubst-expand):
+ If defaults refer to earlier args, or if there's a &rest arg, use
+ #'proclaim-inline.
+ Use #'symbol-macrolet instead of #'subst when replacing argument
+ names with their values in the inline expansion; this avoids
+ (most) instances where the symbol's function slot is used.
+ Document a bug that occurs if the symbol is being shadowed in a
+ lexically-contained scope.
+
2011-06-19 Aidan Kehoe <kehoea(a)parhasard.net>
* cl-macs.el:
diff -r 544e6336d37c -r 810b77562486 lisp/cl-macs.el
--- a/lisp/cl-macs.el Sun Jun 19 17:43:03 2011 +0100
+++ b/lisp/cl-macs.el Sun Jun 19 19:03:39 2011 +0100
＠＠ -3201,7 +3201,10 ＠＠
(unsafe (not (cl-safe-expr-p pbody))))
(while (and p (eq (cl-expr-contains arglist (car p)) 1)) (pop p))
(list 'progn
- (if p nil ; give up if defaults refer to earlier args
+ (if (or p (memq '&rest arglist))
+ ; Defaults refer to earlier args, or we would have to cons up
+ ; something for &rest:
+ (list 'proclaim-inline name)
(list 'define-compiler-macro name
(if (memq '&key arglist)
(list* '&whole 'cl-whole '&cl-quote arglist)
＠＠ -3213,15 +3216,27 ＠＠
(list* 'defun* name arglist docstring body))))
(defun cl-defsubst-expand (argns body simple whole unsafe &rest argvs)
- (if (and whole (not (cl-safe-expr-p (cons 'progn argvs)))) whole
- (if (cl-simple-exprs-p argvs) (setq simple t))
- (let ((lets (mapcan #'(lambda (argn argv)
- (if (or simple (cl-const-expr-p argv))
- (progn (setq body (subst argv argn body))
- (and unsafe (list (list argn argv))))
- (list (list argn argv))))
- argns argvs)))
- (if lets (list 'let lets body) body))))
+ (if (and whole (not (cl-safe-expr-p (cons 'progn argvs))))
+ whole
+ (if (cl-simple-exprs-p argvs)
+ (setq simple t))
+ (let* ((symbol-macros nil)
+ (lets (mapcan #'(lambda (argn argv)
+ (if (or simple (cl-const-expr-p argv))
+ (progn (push (list argn argv) symbol-macros)
+ (and unsafe (list (list argn argv))))
+ (list (list argn argv))))
+ argns argvs)))
+ `(let ,lets
+ (symbol-macrolet
+ ;; #### Bug; this will happily substitute in places where the
+ ;; symbol is being shadowed in a different scope (e.g. inside
+ ;; let bindings or lambda expressions where it has been
+ ;; bound). We don't have GNU's issue where the replacement will
+ ;; be done when the symbol is used in a function context,
+ ;; because we're using #'symbol-macrolet instead of #'subst.
+ ,symbol-macros
+ ,body)))))
;; When a 64-bit build is byte-compiling code, some of its native fixnums
;; will not be represented as fixnums if the byte-compiled code is read by
--
‘Iodine deficiency was endemic in parts of the UK until, through what has been
described as “an unplanned and accidental public health triumph”, iodine was
added to cattle feed to improve milk production in the 1930s.’
(EN Pearce, Lancet, June 2011)
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