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bug#57318: closed (29.0.50; c++-mode: Functions are shown as variables:


From: GNU bug Tracking System
Subject: bug#57318: closed (29.0.50; c++-mode: Functions are shown as variables: partial template specialization)
Date: Wed, 31 Aug 2022 19:27:02 +0000

Your message dated Wed, 31 Aug 2022 19:26:19 +0000
with message-id <Yw+12xTaoIEvH6+1@ACM>
and subject line Re: bug#57318: 29.0.50; c++-mode: Functions are shown as 
variables: partial template specialization
has caused the debbugs.gnu.org bug report #57318,
regarding 29.0.50; c++-mode: Functions are shown as variables: partial template 
specialization
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs@gnu.org.)


-- 
57318: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=57318
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems
--- Begin Message --- Subject: 29.0.50; c++-mode: Functions are shown as variables: partial template specialization Date: Sun, 21 Aug 2022 22:27:31 +0900
Hello,

In the case of C++ partial template specialization [1], functions are
shown as variables.  Please look at the attached screenshots.

  1. emacs -Q
  2. open attached C++ code "specialization.cc"

  attachments:
  - NG_cc-partial-specialization.png
  - OK_cc-partial-specialization.png
  - specialization.cc

In cc-engine.el c-do-declarators, given CDD-NOT-TOP is non-nil at blow:

-------------------------------------------------------------
(defun c-do-declarators
    (cdd-limit cdd-list cdd-not-top cdd-comma-prop cdd-function)

[..snip..]

    (while
        (and (not cdd-exhausted)
             (setq cdd-decl-res (c-forward-declarator cdd-limit)))
      (setq cdd-next-pos (point)
            cdd-id-start (car cdd-decl-res)
            cdd-id-end (cadr cdd-decl-res)
            cdd-got-func (and (eq (char-after) ?\()
                          (or (not (c-major-mode-is 'c++-mode))
                              (not cdd-not-top)  <<<< nil if "class foo<T, ..>"
                              (car (cddr (cddr cdd-decl-res))) ; Id is in
                                        ; parens, etc.
                              (save-excursion
                                (forward-char)
                                (c-forward-syntactic-ws)
                                (looking-at "[*&]")))
-------------------------------------------------------------

-------------------------------------------------------------
template<>>
class One<char> {
public:
    One() {}    // (not cdd-not-top): t
private:
    char _c;
};

template<typename T>
class Two<T, char> {    // "," in "class A<...>"
public:
    Two() {}    // (not cdd-not-top): nil
private:
    T _t;
    char _c;
};
-------------------------------------------------------------

After a brief investigation, the attached cc-engine.el patch seems to
solve this issue at least, but it is not tested enough.

  attachments:
  - 0001-cc-mode-Fix-function-fontification-in-the-case-of-C-.patch


[1] https://en.cppreference.com/w/cpp/language/partial_specialization
-------------------------------------------------------------
$ g++ -o specialization specialization.cc
$ ./specialization
One<T>: primary
One<char>: specialization
Two<T1, T2>: primary
Two<T, char>: specialization
Two<T, T*>: specialization
Two<T, T&>: specialization
Two<T, T[]>: specialization
Two<char, char*>: specialization
Two<char, char&>: specialization
Two<char, char[]>: specialization
$
-------------------------------------------------------------

Regards,
  Naofumi

Attachment: NG_cc-partial-specialization.png
Description: NG

Attachment: OK_cc-partial-specialization.png
Description: OK

Attachment: specialization.cc
Description: test c++ source

Attachment: 0001-cc-mode-Fix-function-fontification-in-the-case-of-C-.patch
Description: patch


In GNU Emacs 29.0.50 (build 1, x86_64-apple-darwin21.6.0, NS appkit-2113.60 
Version 12.5.1 (Build 21G83))
 of 2022-08-20 built on hyperion.local
Repository revision: b2f9c4c6d4bf4a0f1f1f7342cb9de410f187c40c
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.5.1

Configured using:
 'configure --prefix=/Users/naofumi/.local/emacs/head --with-ns
 --disable-ns-self-contained --with-mailutils --with-native-compilation
 --with-xwidgets'

Configured features:
ACL GIF GLIB GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS WEBP XIM XWIDGETS ZLIB

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Major mode: Magit

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Memory information:
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--- End Message ---
--- Begin Message --- Subject: Re: bug#57318: 29.0.50; c++-mode: Functions are shown as variables: partial template specialization Date: Wed, 31 Aug 2022 19:26:19 +0000
Hello, Naofumi.

On Thu, Sep 01, 2022 at 01:01:56 +0900, Naofumi Yasufuku wrote:
> Hello Alan,

[ .... ]

> > When this dynamic binding is instead at nil (rather than t), the
> > fontification works properly, with functions fontified as functions.
> > The reason for this faulty binding was fixing a bug report where
> > scrolling a buffer containing lots of templates was very slow.  Binding
> > c-restricted-<>-arglists to t "solved" that slowness.


> Indeed.  I confirmed that avoiding (c-restricted-<>-arglists t) binding
> solves this misfontification problem at least, but it makes scrolling
> terribly slow...

Yes.  For the bug in 2019 for which I "fixed" this, the scrolling was
around a factor of 6 slower.

[ .... ]

> [..snip..]
> > Can I ask you, please, to apply and test my proposed patch, which I
> > enclose below.  Would you please test it on your real C++ source code,
> > and either confirm it really works, or say what's still faulty about it.
> > If there are any problems with applying the patch, feel free to send me
> > personal email.


> I've applied your patch.  It works well and solves misfontification
> problem.  At the same time, I've not seen any noticeable performance
> degradation by this patch so far.  Great.

Many thanks!

I've committed the patch to the standalone CC Mode repository and the
Emacs master branch at savannah.  I'm closing the bug with this post.

>   attachment: fix_c-restricted--arglists_verification.png

> I came across this problem when I tried to compare the current
> tree-sitter's fontification quality and performance with familiar
> cc-mode by using very-fast flat_hash_map code [1][2].  Now problematic
> fontification has gone.

In the long run, tree-sitter (or something like it) is going to be
superseding CC Mode.  Keeping up with the constantly evolving standards
in CC Mode has proven to be just too much work.  :-(

[ .... ]

> Best regards,
>   Naofumi

> [1] https://github.com/skarupke/flat_hash_map/blob/master/flat_hash_map.hpp
> [2] https://probablydance.com/2017/02/26/i-wrote-the-fastest-hashtable/

-- 
Alan Mackenzie (Nuremberg, Germany).


--- End Message ---

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