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C mode fontification took 50 seconds


From: Richard Stallman
Subject: C mode fontification took 50 seconds
Date: Sat, 28 Apr 2007 14:35:30 -0400

Using the latest version of Emacs 22 files, in a 48-line Linux console,
I visited the file xdisp.c and typed C-u 23402 C-n.
Then I typed C-v and waited.

After it had gone on for 30 seconds, I stopped the process and looked
at it with GDB.  xbacktrace gives c-syntactic-skip-backward,
c-in-knr-argdecl, c-beginning-of-decl-1, further up
c-beginning-of-defun, further up, c-parse-state,
c-font-lock-complex-decl-prepare.  This was called
from font-lock-fontify-keywords-region.

It looks like c-in-knr-argdecl has the infinite loop.

After I continued, it eventually finished, but yuck!

This is reproducible.




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