|
| From: | Eli Zaretskii |
| Subject: | bug#10149: Emacs 24 hangs for several minutes with very large c++ files |
| Date: | Sat, 02 Nov 2019 09:31:47 +0200 |
> From: Stefan Kangas <stefan@marxist.se>
> Date: Sat, 02 Nov 2019 00:14:44 +0100
> Cc: Alan Mackenzie <acm@muc.de>, 10149@debbugs.gnu.org
>
> > [1] The large chunk of commented text in the attached file
>
> I do see a significant slowdown in navigating the file once I comment
> out the block of code. It doesn't hang for several minutes for me,
> but it takes 5-10 seconds for C-v, M-v depending on where point is.
>
> Alan, any comments on this?
The OP doesn't make it clear, and it took me some seconds to realize,
that to see the problem, one needs to _un_comment the commented chunk.
Here's the profile for paging through that part with C-v. As is
clearly visible, the culprit is c-font-lock-single-decl.
- command-execute 9167 72%
- call-interactively 9167 72%
- funcall-interactively 9164 72%
- scroll-up-command 9162 72%
- scroll-up 9125 71%
- jit-lock-function 9124 71%
- jit-lock-fontify-now 9124 71%
- jit-lock--run-functions 9123 71%
- run-hook-wrapped 9123 71%
- #<compiled -0x1ffffffff85fe718> 9123 71%
- font-lock-fontify-region 9123 71%
- c-font-lock-fontify-region 9123 71%
- font-lock-default-fontify-region 9014 71%
- font-lock-fontify-keywords-region 9003 70%
- c-font-lock-declarations 8645 68%
- c-find-decl-spots 8640 68%
- #<compiled -0x1ffffffff9680598> 8579 67%
- c-font-lock-single-decl 8453 66%
- c-font-lock-declarators 39 0%
- c-do-declarators 38 0%
- c-forward-declarator 30 0%
- c-syntactic-re-search-forward 14 0%
c-beginning-of-macro 8 0%
- c-forward-name 3 0%
c-forward-sws 1 0%
- c-backward-sws 1 0%
c-beginning-of-current-token 1 0%
#<compiled -0x1ffffffff9680fb0> 2 0%
c-forward-sws 1 0%
c-backward-sws 1 0%
c-fontify-recorded-types-and-refs 1 0%
- c-forward-decl-or-cast-1 98 0%
- c-forward-type 62 0%
- c-forward-name 21 0%
c-forward-sws 7 0%
- c-check-qualified-type 10 0%
- c-forward-over-compound-identifier 8 0%
- c-forward-over-token 6 0%
c-forward-sws 3 0%
c-forward-sws 1 0%
c-on-identifier 1 0%
- c-add-type 4 0%
- c-syntactic-content 4 0%
c-forward-sws 2 0%
c-forward-keyword-clause 2 0%
#<compiled -0x1ffffffff9736820> 1 0%
#<compiled -0x1ffffffff8c38b48> 1 0%
c-forward-sws 1 0%
- c-forward-name 6 0%
c-forward-sws 1 0%
- c-backward-token-2 4 0%
c-backward-sws 3 0%
c-beginning-of-current-token 1 0%
- c-backward-sws 3 0%
c-beginning-of-current-token 2 0%
c-forward-sws 1 0%
- c-backward-sws 10 0%
- c-beginning-of-macro 8 0%
back-to-indentation 3 0%
- c-backward-token-2 2 0%
c-backward-sws 2 0%
- c-bs-at-toplevel-p 42 0%
- c-brace-stack-at 39 0%
- c-update-brace-stack 39 0%
c-syntactic-re-search-forward 38 0%
c-beginning-of-macro 7 0%
c-forward-sws 4 0%
c-font-lock-<>-arglists 87 0%
- c-font-lock-cut-off-declarators 68 0%
- c-back-over-member-initializers 46 0%
- c-parse-state 44 0%
- c-parse-state-1 44 0%
- c-append-to-state-cache 28 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
- c-remove-stale-state-cache 16 0%
- c-beginning-of-macro 1 0%
#<compiled -0x1ffffffff8c48290> 1 0%
c-backward-sws 1 0%
- c-determine-limit 20 0%
- c-semi-pp-to-literal 11 0%
c-restore-string-fences 1 0%
- c-syntactic-skip-backward 1 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
- c-font-lock-complex-decl-prepare 61 0%
- c-parse-state 59 0%
- c-parse-state-1 59 0%
c-append-to-state-cache 31 0%
- c-remove-stale-state-cache-backwards 18 0%
- c-state-literal-at 4 0%
c-state-pp-to-literal 3 0%
- c-state-safe-place 1 0%
c-state-pp-to-literal 1 0%
c-state-balance-parens-backwards 1 0%
c-remove-stale-state-cache 9 0%
c-backward-sws 1 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
- c-font-lock-enclosing-decls 45 0%
- c-parse-state 35 0%
- c-parse-state-1 33 0%
c-append-to-state-cache 22 0%
c-remove-stale-state-cache 11 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
c-determine-limit 9 0%
- c-syntactic-skip-backward 1 0%
c-beginning-of-macro 1 0%
- c-font-lock-enum-tail 35 0%
- c-parse-state 23 0%
- c-parse-state-1 22 0%
c-append-to-state-cache 15 0%
c-remove-stale-state-cache 6 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
- c-backward-over-enum-header 12 0%
- c-backward-typed-enum-colon 6 0%
- c-backward-token-2 6 0%
- c-backward-sws 1 0%
c-beginning-of-current-token 1 0%
- c-backward-token-2 4 0%
- c-backward-sws 3 0%
- c-beginning-of-macro 2 0%
back-to-indentation 2 0%
c-beginning-of-current-token 1 0%
c-on-identifier 1 0%
- #<compiled -0x1ffffffff8d285c8> 31 0%
- c-beginning-of-decl-1 18 0%
- c-beginning-of-statement-1 16 0%
- c-crosses-statement-barrier-p 7 0%
c-forward-sws 3 0%
c-literal-limits 1 0%
- c-backward-sws 5 0%
- c-beginning-of-macro 1 0%
back-to-indentation 1 0%
c-beginning-of-macro 1 0%
- c-syntactic-re-search-forward 1 0%
c-beginning-of-macro 1 0%
- c-determine-limit 11 0%
- c-backward-sws 2 0%
c-beginning-of-macro 1 0%
- c-semi-pp-to-literal 1 0%
c-semi-get-near-cache-entry 1 0%
- c-font-lock-raw-strings 4 0%
- c-semi-pp-to-literal 4 0%
c-restore-string-fences 1 0%
- c-font-lock-invalid-single-quotes 4 0%
- c-literal-limits 2 0%
c-full-pp-to-literal 2 0%
#<compiled -0x1ffffffff8d28718> 4 0%
#<compiled -0x1ffffffff8d28948> 3 0%
#<compiled -0x1ffffffff8d28fb0> 3 0%
#<compiled -0x1ffffffff8d287b8> 2 0%
#<compiled -0x1ffffffff8d28ad8> 2 0%
c-font-lock-enum-body 1 0%
#<compiled -0x1ffffffffa13eaf0> 1 0%
- font-lock-fontify-syntactically-region 11 0%
syntax-ppss 7 0%
- c-before-context-fl-expand-region 108 0%
- mapc 108 0%
- #<compiled -0x1ffffffff8d25220> 108 0%
- c-context-expand-fl-region 108 0%
- c-fl-decl-end 79 0%
- c-slow-enclosing-c++-attribute 74 0%
- c-parse-state 74 0%
- c-parse-state-1 73 0%
c-append-to-state-cache 50 0%
- c-remove-stale-state-cache 17 0%
- c-beginning-of-macro 2 0%
#<compiled -0x1ffffffff8c48290> 1 0%
- c-parse-state-get-strategy 5 0%
- c-get-fallback-scan-pos 5 0%
- beginning-of-defun 5 0%
beginning-of-defun-raw 5 0%
c-beginning-of-macro 1 0%
- c-beginning-of-macro 1 0%
#<compiled -0x1ffffffff8c48290> 1 0%
- c-literal-start 2 0%
c-semi-pp-to-literal 2 0%
c-beginning-of-macro 1 0%
c-on-identifier 1 0%
c-backward-sws 1 0%
- c-fl-decl-start 29 0%
- c-determine-limit 13 0%
- c-semi-pp-to-literal 2 0%
- #<compiled -0x1ffffffff8c41948> 1 0%
c-clear-string-fences 1 0%
c-backward-sws 1 0%
c-literal-start 2 0%
c-syntactic-skip-backward 1 0%
- #<compiled -0x1ffffffff8d25120> 1 0%
c-clear-string-fences 1 0%
- eval 1 0%
if 1 0%
- execute-extended-command 2 0%
- sit-for 2 0%
- redisplay 1 0%
- redisplay_internal (C function) 1 0%
- find-image 1 0%
image-search-load-path 1 0%
- byte-code 3 0%
- read-extended-command 3 0%
- completing-read 3 0%
- completing-read-default 3 0%
read-from-minibuffer 1 0%
+ redisplay_internal (C function) 3078 24%
+ ... 437 3%
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