bug#56648: 29.0.50; Need for `compiled-function-p`

bug#56648: 29.0.50; Need for `compiled-function-p`

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Package: Emacs
Version: 29.0.50


I think we need something like `compiled-function-p`, i.e. a function
which will return non-nil for both byte-code and native-code functions.
Its definition would be

    (defun compiled-function-p (obj)
      "<Appropriate doc here>"
      (or (byte-code-function-p obj)
          (subr-native-elisp-p obj)))

This is because `byte-code-function-p` shouldn't be changed to return
non-nil for native-code functions (both because it would break a lot of
code and because the name would be too confusing), but several uses of
`byte-code-function-p` actually want to know "is this an (inefficient)
source code function or not" (e.g. in unidata-gen.el,
loadup.el, bytecomp.el, ...).


        Stefan

bug#56648: Acknowledgement (29.0.50; Need for `compiled-function-p`)

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

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Here is a draft of a patch for that (no docs yet).
Any comment/suggestion?


        Stefan

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diff --git a/admin/unidata/unidata-gen.el b/admin/unidata/unidata-gen.el
index 0a9fd5108ce..78dd1c37288 100644
--- a/admin/unidata/unidata-gen.el
+++ b/admin/unidata/unidata-gen.el
@@ -1083,8 +1083,8 @@ unidata-split-name
 
 (defun unidata--ensure-compiled (&rest funcs)
   (dolist (fun funcs)
-    (or (byte-code-function-p (symbol-function fun))
-	(byte-compile fun))))
+    (unless (compiled-function-p (symbol-function fun))
+      (byte-compile fun))))
 
 (defun unidata-gen-table-name (prop index &rest _ignore)
   (let* ((table (unidata-gen-table-word-list prop index 'unidata-split-name))
diff --git a/lisp/cedet/semantic/bovine.el b/lisp/cedet/semantic/bovine.el
index 1e52b1f8504..1ab27e33403 100644
--- a/lisp/cedet/semantic/bovine.el
+++ b/lisp/cedet/semantic/bovine.el
@@ -143,14 +143,15 @@ semantic-bovinate-stream
                         cvl nil     ;re-init the collected value list.
                         lte (car matchlist) ;Get the local matchlist entry.
                         )
-                  (if (or (byte-code-function-p (car lte))
+                  ;; FIXME: Should this `or' be replaced with `functionp'?
+                  (if (or (compiled-function-p (car lte))
                           (listp (car lte)))
                       ;; In this case, we have an EMPTY match!  Make
                       ;; stuff up.
                       (setq cvl (list nil))))
 
                 (while (and lte
-                            (not (byte-code-function-p (car lte)))
+                            (not (compiled-function-p (car lte)))
                             (not (listp (car lte))))
 
                   ;; GRAMMAR SOURCE DEBUGGING!
diff --git a/lisp/emacs-lisp/advice.el b/lisp/emacs-lisp/advice.el
index 86a42b208e7..11d055e2059 100644
--- a/lisp/emacs-lisp/advice.el
+++ b/lisp/emacs-lisp/advice.el
@@ -1060,9 +1060,9 @@
 ;;   (print "Let's clean up now!"))
 ;; foo
 ;;
-;; Now `foo's advice is byte-compiled:
+;; Now `foo's advice is compiled:
 ;;
-;; (byte-code-function-p 'ad-Advice-foo)
+;; (compiled-function-p 'ad-Advice-foo)
 ;; t
 ;;
 ;; (foo 3)
@@ -1304,7 +1304,7 @@
 ;; constructed during preactivation was used, even though we did not specify
 ;; the `compile' flag:
 ;;
-;; (byte-code-function-p 'ad-Advice-fum)
+;; (compiled-function-p 'ad-Advice-fum)
 ;; t
 ;;
 ;; (fum 2)
@@ -1335,7 +1335,7 @@
 ;;
 ;; A new uncompiled advised definition got constructed:
 ;;
-;; (byte-code-function-p 'ad-Advice-fum)
+;; (compiled-function-p 'ad-Advice-fum)
 ;; nil
 ;;
 ;; (fum 2)
@@ -2124,9 +2124,9 @@ ad-advice-p
 
 (defsubst ad-compiled-p (definition)
   "Return non-nil if DEFINITION is a compiled byte-code object."
-  (or (byte-code-function-p definition)
-       (and (macrop definition)
-            (byte-code-function-p (ad-lambdafy definition)))))
+  (or (compiled-function-p definition)
+      (and (macrop definition)
+           (compiled-function-p (ad-lambdafy definition)))))
 
 (defsubst ad-compiled-code (compiled-definition)
   "Return the byte-code object of a COMPILED-DEFINITION."
diff --git a/lisp/emacs-lisp/byte-opt.el b/lisp/emacs-lisp/byte-opt.el
index 5705b2a8fd7..0f4131a658d 100644
--- a/lisp/emacs-lisp/byte-opt.el
+++ b/lisp/emacs-lisp/byte-opt.el
@@ -2476,8 +2476,7 @@ byte-optimize-lapcode
 ;; itself, compile some of its most used recursive functions (at load time).
 ;;
 (eval-when-compile
- (or (byte-code-function-p (symbol-function 'byte-optimize-form))
-     (subr-native-elisp-p (symbol-function 'byte-optimize-form))
+ (or (compiled-function-p (symbol-function 'byte-optimize-form))
      (assq 'byte-code (symbol-function 'byte-optimize-form))
      (let ((byte-optimize nil)
 	   (byte-compile-warnings nil))
diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 86681cf4dd4..2cccc85f9c3 100644
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -1393,7 +1393,7 @@ byte-compile-fdefinition
 		      (or (symbolp (symbol-function fn))
 			  (consp (symbol-function fn))
 			  (and (not macro-p)
-			       (byte-code-function-p (symbol-function fn)))))
+			       (compiled-function-p (symbol-function fn)))))
 	    (setq fn (symbol-function fn)))
           (let ((advertised (gethash (if (and (symbolp fn) (fboundp fn))
                                          ;; Could be a subr.
@@ -1405,7 +1405,7 @@ byte-compile-fdefinition
               (if macro-p
                   `(macro lambda ,advertised)
                 `(lambda ,advertised)))
-             ((and (not macro-p) (byte-code-function-p fn)) fn)
+             ((and (not macro-p) (compiled-function-p fn)) fn)
              ((not (consp fn)) nil)
              ((eq 'macro (car fn)) (cdr fn))
              (macro-p nil)
@@ -2957,11 +2957,11 @@ byte-compile
 	  (setq fun (cdr fun)))
       (prog1
           (cond
-           ;; Up until Emacs-24.1, byte-compile silently did nothing when asked to
-           ;; compile something invalid.  So let's tune down the complaint from an
-           ;; error to a simple message for the known case where signaling an error
-           ;; causes problems.
-           ((byte-code-function-p fun)
+           ;; Up until Emacs-24.1, byte-compile silently did nothing
+           ;; when asked to compile something invalid.  So let's tone
+           ;; down the complaint from an error to a simple message for
+           ;; the known case where signaling an error causes problems.
+           ((compiled-function-p fun)
             (message "Function %s is already compiled"
                      (if (symbolp form) form "provided"))
             fun)
@@ -3538,7 +3538,7 @@ byte-compile-inline-lapcode
     (byte-compile-out-tag endtag)))
 
 (defun byte-compile-unfold-bcf (form)
-  "Inline call to byte-code-functions."
+  "Inline call to byte-code function."
   (let* ((byte-compile-bound-variables byte-compile-bound-variables)
          (fun (car form))
          (fargs (aref fun 0))
@@ -5272,11 +5272,13 @@ display-call-tree
 		((not (consp f))
 		 "<malformed function>")
 		((eq 'macro (car f))
-		 (if (or (byte-code-function-p (cdr f))
+		 (if (or (compiled-function-p (cdr f))
+			 ;; FIXME: Can this still happen?
 			 (assq 'byte-code (cdr (cdr (cdr f)))))
 		     " <compiled macro>"
 		   " <macro>"))
 		((assq 'byte-code (cdr (cdr f)))
+		 ;; FIXME: Can this still happen?
 		 "<compiled lambda>")
 		((eq 'lambda (car f))
 		 "<function>")
@@ -5525,9 +5527,7 @@ byte-compile-report-ops
 ;; itself, compile some of its most used recursive functions (at load time).
 ;;
 (eval-when-compile
-  (or (byte-code-function-p (symbol-function 'byte-compile-form))
-      (subr-native-elisp-p (symbol-function 'byte-compile-form))
-      (assq 'byte-code (symbol-function 'byte-compile-form))
+  (or (compiled-function-p (symbol-function 'byte-compile-form))
       (let ((byte-optimize nil)		; do it fast
 	    (byte-compile-warnings nil))
 	(mapc (lambda (x)
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 6646167b92b..ea3c23e7b54 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -3408,7 +3408,7 @@ cl--macroexp-fboundp
                  (character	. natnump)
                  (char-table	. char-table-p)
                  (command	. commandp)
-                 (compiled-function . byte-code-function-p)
+                 (compiled-function . compiled-function-p)
                  (hash-table	. hash-table-p)
                  (cons		. consp)
                  (fixnum	. fixnump)
diff --git a/lisp/emacs-lisp/macroexp.el b/lisp/emacs-lisp/macroexp.el
index 6a193a56d2d..5ae9d8368f0 100644
--- a/lisp/emacs-lisp/macroexp.el
+++ b/lisp/emacs-lisp/macroexp.el
@@ -823,7 +823,7 @@ internal-macroexpand-for-load
 (eval-when-compile
   (add-hook 'emacs-startup-hook
             (lambda ()
-              (and (not (byte-code-function-p
+              (and (not (compiled-function-p
                          (symbol-function 'macroexpand-all)))
                    (locate-library "macroexp.elc")
                    (load "macroexp.elc")))))
diff --git a/lisp/emacs-lisp/pcase.el b/lisp/emacs-lisp/pcase.el
index 07443dabfef..10bd4bc6886 100644
--- a/lisp/emacs-lisp/pcase.el
+++ b/lisp/emacs-lisp/pcase.el
@@ -607,31 +607,38 @@ pcase-mutually-exclusive-predicates
     (symbolp . vectorp)
     (symbolp . stringp)
     (symbolp . byte-code-function-p)
+    (symbolp . compiled-function-p)
     (symbolp . recordp)
     (integerp . consp)
     (integerp . arrayp)
     (integerp . vectorp)
     (integerp . stringp)
     (integerp . byte-code-function-p)
+    (integerp . compiled-function-p)
     (integerp . recordp)
     (numberp . consp)
     (numberp . arrayp)
     (numberp . vectorp)
     (numberp . stringp)
     (numberp . byte-code-function-p)
+    (numberp . compiled-function-p)
     (numberp . recordp)
     (consp . arrayp)
     (consp . atom)
     (consp . vectorp)
     (consp . stringp)
     (consp . byte-code-function-p)
+    (consp . compiled-function-p)
     (consp . recordp)
     (arrayp . byte-code-function-p)
+    (arrayp . compiled-function-p)
     (vectorp . byte-code-function-p)
+    (vectorp . compiled-function-p)
     (vectorp . recordp)
     (stringp . vectorp)
     (stringp . recordp)
-    (stringp . byte-code-function-p)))
+    (stringp . byte-code-function-p)
+    (stringp . compiled-function-p)))
 
 (defun pcase--mutually-exclusive-p (pred1 pred2)
   (or (member (cons pred1 pred2)
@@ -771,8 +778,8 @@ pcase--split-pred
                    ((consp (cadr pat)) #'consp)
                    ((stringp (cadr pat)) #'stringp)
                    ((vectorp (cadr pat)) #'vectorp)
-                   ((byte-code-function-p (cadr pat))
-                    #'byte-code-function-p))))
+                   ((compiled-function-p (cadr pat))
+                    #'compiled-function-p))))
         (pcase--mutually-exclusive-p (cadr upat) otherpred))
       '(:pcase--fail . nil))
      ;; Since we turn (or 'a 'b 'c) into (pred (pcase--flip (memq '(a b c))))
diff --git a/lisp/gnus/gnus.el b/lisp/gnus/gnus.el
index 8221f3017a2..7896babbb35 100644
--- a/lisp/gnus/gnus.el
+++ b/lisp/gnus/gnus.el
@@ -4169,8 +4169,7 @@ gnus
   ;; file.
   (unless (string-match "^Gnus" gnus-version)
     (load "gnus-load" nil t))
-  (unless (or (byte-code-function-p (symbol-function 'gnus))
-	      (subr-native-elisp-p (symbol-function 'gnus)))
+  (unless (compiled-function-p (symbol-function 'gnus))
     (message "You should compile Gnus")
     (sit-for 2))
   (let ((gnus-action-message-log (list nil)))
diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index dc64a09f3d8..7978108988b 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -1009,7 +1009,7 @@ help-fns-function-description-header
                 (help-fns--analyze-function function))
                (file-name (find-lisp-object-file-name
                            function (if aliased 'defun def)))
-               (beg (if (and (or (byte-code-function-p def)
+               (beg (if (and (or (compiled-function-p def)
                                  (keymapp def)
                                  (memq (car-safe def) '(macro lambda closure)))
                              (stringp file-name)
@@ -1044,7 +1044,7 @@ help-fns-function-description-header
                            (t "Lisp function"))))
 		 ((or (eq (car-safe def) 'macro)
 		      ;; For advised macros, def is a lambda
-		      ;; expression or a byte-code-function-p, so we
+		      ;; expression or a compiled-function-p, so we
 		      ;; need to check macros before functions.
 		      (macrop function))
 		  (concat beg "Lisp macro"))
@@ -1538,8 +1538,8 @@ help-fns--var-safe-local
     (when safe-var
       (princ "  This variable is safe as a file local variable ")
       (princ "if its value\n  satisfies the predicate ")
-      (princ (if (byte-code-function-p safe-var)
-		 "which is a byte-compiled expression.\n"
+      (princ (if (compiled-function-p safe-var)
+		 "which is a compiled expression.\n"
 	       (format-message "`%s'.\n" safe-var))))))
 
 (add-hook 'help-fns-describe-variable-functions #'help-fns--var-risky)
diff --git a/lisp/loadup.el b/lisp/loadup.el
index 21a87dbd77b..669470926fe 100644
--- a/lisp/loadup.el
+++ b/lisp/loadup.el
@@ -159,8 +159,7 @@
 ;; Load-time macro-expansion can only take effect after setting
 ;; load-source-file-function because of where it is called in lread.c.
 (load "emacs-lisp/macroexp")
-(if (or (byte-code-function-p (symbol-function 'macroexpand-all))
-        (subr-native-elisp-p (symbol-function 'macroexpand-all)))
+(if (compiled-function-p (symbol-function 'macroexpand-all))
     nil
   ;; Since loaddefs is not yet loaded, macroexp's uses of pcase will simply
   ;; fail until pcase is explicitly loaded.  This also means that we have to
diff --git a/lisp/mh-e/mh-e.el b/lisp/mh-e/mh-e.el
index a3a363e33ff..741de9cb88a 100644
--- a/lisp/mh-e/mh-e.el
+++ b/lisp/mh-e/mh-e.el
@@ -389,11 +389,11 @@ mh-version
   (insert "MH-E " mh-version "\n\n")
   ;; MH-E compilation details.
   (insert "MH-E compilation details:\n")
-  (let* ((compiled-mhe (byte-code-function-p (symbol-function 'mh-version)))
+  (let* ((compiled-mhe (compiled-function-p (symbol-function 'mh-version)))
          (gnus-compiled-version (if compiled-mhe
                                     (mh-macro-expansion-time-gnus-version)
                                   "N/A")))
-    (insert " Byte compiled:\t\t" (if compiled-mhe "yes" "no") "\n"
+    (insert " Compiled:\t\t" (if compiled-mhe "yes" "no") "\n"
             " Gnus (compile-time):\t" gnus-compiled-version "\n"
             " Gnus (run-time):\t" (mh-run-time-gnus-version) "\n\n"))
   ;; Emacs version.
diff --git a/lisp/subr.el b/lisp/subr.el
index 510a77dbc8d..a3066cf96fd 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -4019,6 +4019,12 @@ macrop
       (or (eq 'macro (car def))
           (and (autoloadp def) (memq (nth 4 def) '(macro t)))))))
 
+(defun compiled-function-p (object)
+  "Return non-nil if OBJECT is a function that has been compiled.
+Does not distinguish between functions implemented in machine code
+or byte-code."
+  (or (subrp object) (byte-code-function-p)))
+
 (defun field-at-pos (pos)
   "Return the field at position POS, taking stickiness etc into account."
   (let ((raw-field (get-char-property (field-beginning pos) 'field)))
diff --git a/test/lisp/international/ucs-normalize-tests.el b/test/lisp/international/ucs-normalize-tests.el
index 27a4e70c78e..774a3ea7ec9 100644
--- a/test/lisp/international/ucs-normalize-tests.el
+++ b/test/lisp/international/ucs-normalize-tests.el
@@ -246,7 +246,7 @@ ucs-normalize-part1
                  ucs-normalize-tests--rule1-failing-for-partX
                  ucs-normalize-tests--rule1-holds-p
                  ucs-normalize-tests--rule2-holds-p))
-    (or (byte-code-function-p (symbol-function fun))
+    (or (compiled-function-p (symbol-function fun))
         (byte-compile fun)))
   (let ((ucs-normalize-tests--chars-part1 (make-char-table 'ucs-normalize-tests t)))
     (setq ucs-normalize-tests--part1-rule1-failed-lines

bug#56648: Acknowledgement (29.0.50; Need for `compiled-function-p`)

[Mike Kupfer]

+(defun compiled-function-p (object)
+  "Return non-nil if OBJECT is a function that has been compiled.
+Does not distinguish between functions implemented in machine code
+or byte-code."
+  (or (subrp object) (byte-code-function-p)))

Doesn't byte-code-function-p require an argument?

mike

bug#56648: 29.0.50; Need for `compiled-function-p`

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> This is because `byte-code-function-p` shouldn't be changed to return
> non-nil for native-code functions (both because it would break a lot of
> code and because the name would be too confusing), but several uses of
> `byte-code-function-p` actually want to know "is this an (inefficient)
> source code function or not" (e.g. in unidata-gen.el,
> loadup.el, bytecomp.el, ...).

Makes sense to me.  <bikeshed>But since the use case is "is this one of
those slow source code functions?" then why not reverse the logic and
call it `uncompiled-function-p'?</bikeshed>

bug#56648: Acknowledgement (29.0.50; Need for `compiled-function-p`)

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Mike Kupfer [2022-07-22 19:55:49] wrote:
> Doesn't byte-code-function-p require an argument?

Nah... arguments are overrated!
And besides, we already have so many of them on emacs-devel, do we
really need more?


        Stefan "thanks!"

bug#56648: 29.0.50; Need for `compiled-function-p`

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Lars Ingebrigtsen [2022-07-23 06:30:03] wrote:
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> This is because `byte-code-function-p` shouldn't be changed to return
>> non-nil for native-code functions (both because it would break a lot of
>> code and because the name would be too confusing), but several uses of
>> `byte-code-function-p` actually want to know "is this an (inefficient)
>> source code function or not" (e.g. in unidata-gen.el,
>> loadup.el, bytecomp.el, ...).
>
> Makes sense to me.  <bikeshed>But since the use case is "is this one of
> those slow source code functions?" then why not reverse the logic and
> call it `uncompiled-function-p'?</bikeshed>

I can think of 2 reasons:

A) `compiled-function-p` exists in Common-Lisp.

B) It would require redoing some of the work I've just done because

       (uncompiled-function-p X) != (not (compiled-function-p X))

   when X is not a function, so it's not just a simple search&replace.


-- Stefan

bug#56648: 29.0.50; Need for `compiled-function-p`

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> A) `compiled-function-p` exists in Common-Lisp.
>
> B) It would require redoing some of the work I've just done because
>
>        (uncompiled-function-p X) != (not (compiled-function-p X))
>
>    when X is not a function, so it's not just a simple search&replace.

Makes sense.

bug#56648: 29.0.50; Need for `compiled-function-p`

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Pushed to `master` with some tweaks and doc,


        Stefan

bug#56648: 29.0.50; Need for `compiled-function-p`

[Eli Zaretskii]

> Resent-To: bug-gnu-emacs@gnu.org
> Cc: 56648-done@debbugs.gnu.org
> Date: Sun, 14 Aug 2022 12:30:20 -0400
> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Pushed to `master` with some tweaks and doc,

Which completely breaks the "normal" build, sigh...

bug#56648: 29.0.50; Need for `compiled-function-p`

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> Which completely breaks the "normal" build, sigh...

Works for me after a bootstrap.

bug#56648: 29.0.50; Need for `compiled-function-p`

[Eli Zaretskii]

> +(defun compiled-function-p (object)
> +  "Return non-nil if OBJECT is a function that has been compiled.
> +Does not distinguish between functions implemented in machine code
> +or byte-code."
> +  (or (subrp object) (byte-code-function-p object)))

What happened to this part from bytecomp.el:

> -  (or (byte-code-function-p (symbol-function 'byte-compile-form))
> -      (subr-native-elisp-p (symbol-function 'byte-compile-form))
> -      (assq 'byte-code (symbol-function 'byte-compile-form)) <<<<<<<<<<<<<
> +  (or (compiled-function-p (symbol-function 'byte-compile-form))

bug#56648: 29.0.50; Need for `compiled-function-p`

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,  56648@debbugs.gnu.org
> Date: Sun, 14 Aug 2022 18:47:08 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Which completely breaks the "normal" build, sigh...
> 
> Works for me after a bootstrap.

bootstrap != "normal build"

I never bootstrap, because I keep old executables around, for easier
bisecting.  I didn't need to bootstrap in this case, either, just a
couple of annoying manual actions.

bug#56648: 29.0.50; Need for `compiled-function-p`

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii [2022-08-14 19:34:32] wrote:
>> Pushed to `master` with some tweaks and doc,
> Which completely breaks the "normal" build, sigh...

Hmm... works for me, so I guess the devil is in the quotes?


        Stefan

bug#56648: 29.0.50; Need for `compiled-function-p`

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

>> -  (or (byte-code-function-p (symbol-function 'byte-compile-form))
>> -      (subr-native-elisp-p (symbol-function 'byte-compile-form))
>> -      (assq 'byte-code (symbol-function 'byte-compile-form)) <<<<<<<<<<<<<

According to my reading of the code, this `assq` can never return
non-nil.

I think it was a left-over from many years ago when the byte-compiler
cuold generated code of the form (lambda (..) (byte-code ...)).

Strictly speaking we still occasionally generate such (byte-code ...)
thingies, but only in cases that don't apply here (e.g. it's not applied
for functions, see `byte-compile-out-toplevel`).


        Stefan

bug#56648: 29.0.50; Need for `compiled-function-p`

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: 56648@debbugs.gnu.org
> Date: Sun, 14 Aug 2022 13:51:57 -0400
> 
> >> -  (or (byte-code-function-p (symbol-function 'byte-compile-form))
> >> -      (subr-native-elisp-p (symbol-function 'byte-compile-form))
> >> -      (assq 'byte-code (symbol-function 'byte-compile-form)) <<<<<<<<<<<<<
> 
> According to my reading of the code, this `assq` can never return
> non-nil.

Too bad the commit log message didn't say that, then.  Imagine someone
5 or 10 years from now trying to understand the fine points of that
changeset...

bug#56648: 29.0.50; Need for `compiled-function-p`

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

>> >> -  (or (byte-code-function-p (symbol-function 'byte-compile-form))
>> >> -      (subr-native-elisp-p (symbol-function 'byte-compile-form))
>> >> -      (assq 'byte-code (symbol-function 'byte-compile-form)) <<<<<<<<<<<<<
>> >> +  (or (compiled-function-p (symbol-function 'byte-compile-form))
>> 
>> According to my reading of the code, this `assq` can never return
>> non-nil.
>
> Too bad the commit log message didn't say that, then.  Imagine someone
> 5 or 10 years from now trying to understand the fine points of that
> changeset...

If (assq 'byte-code (symbol-function 'byte-compile-form)) returns
non-nil, it means that the `byte-compile-form` function has been
byte-compiled by the Emacs-18 byte-compiler (the byte-code-function type
was only introduced in Emacs-19).

So `compiled-function-p` *should* replace all 3 cases.

IOW I believe the above diff is "obviously right" and the question is
whether `compiled-function-p` should be changed to return non-nil for
functions of the form (lambda (...) (byte-code ...)), i.e. those
functions generated by Emacs-18's byte-compiler.  I hope we don't need
to keep that backward compatibility, tho ;-)


        Stefan