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bug#23278: 25.0.92; font-lock-ensure is too slow
From: |
Dmitry Gutov |
Subject: |
bug#23278: 25.0.92; font-lock-ensure is too slow |
Date: |
Tue, 12 Apr 2016 22:49:09 +0300 |
Example:
Open xdisp.c, navigate to the first line. Evaluate:
(load "jit-lock")
(benchmark 1000 '(font-lock-ensure (line-beginning-position)
(line-end-position)))
=> 0.66s
Which puts a dampener on the idea of syntax highlighting xref results in
the open files.
With the patch below, the benchmark executes 100 times faster.
OK to apply?
diff --git a/lisp/jit-lock.el b/lisp/jit-lock.el
index 810c220..a582c48 100644
--- a/lisp/jit-lock.el
+++ b/lisp/jit-lock.el
@@ -387,10 +387,11 @@ jit-lock-fontify-now
;; Fontify chunks beginning at START. The end of a
;; chunk is either `end', or the start of a region
;; before `end' that has already been fontified.
- (while (and start (< start end))
- ;; Determine the end of this chunk.
- (setq next (or (text-property-any start end 'fontified t)
- end))
+ (while (and start
+ (< start
+ ;; Determine the end of this chunk.
+ (setq next (or (text-property-any start end 'fontified
t)
+ end))))
;; Fontify the chunk, and mark it as fontified.
;; We mark it first, to make sure that we don't indefinitely
In GNU Emacs 25.0.92.12 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.7)
of 2016-04-10 built on axl
Repository revision: 20686f7a6430ef37f17b3866f14e7dc3095c1524
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description: Ubuntu 15.10
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