Re: ntemacs hangs when openning the attached file

[Eli Zaretskii <eliz@gnu.org>]

> Date: Wed, 7 May 2008 12:01:38 +0800
> From: "yu jie" <yujie052@gmail.com>
> 
>     The current CVS header version hangs when openning the attached file.

No, it doesn't hang, it just takes a lot of time to visit this file.
I measured 61 seconds on a 3GHz machine.  This file has 86406 lines,
and uses some pretty non-standard formatting, such as this one:

  static int simpleNext(
    sqlite3_tokenizer_cursor *pCursor,  /* Cursor returned by simpleOpen */
    const char **ppToken,               /* OUT: *ppToken is the token text */
    int *pnBytes,                       /* OUT: Number of bytes in token */
    int *piStartOffset,                 /* OUT: Starting offset of token */
    int *piEndOffset,                   /* OUT: Ending offset of token */
    int *piPosition                     /* OUT: Position integer of token */
  ){

It also uses long comments formatted like this:

  /*
  ** Additional bit values that can be ORed with an affinity without
  ** changing the affinity.
  */

I'm guessing that this formatting coupled with the sheer size of the
file somehow triggers an inefficiency.

I didn't dig into the problem deep enough to find the actual culprit,
but if I run Emacs under GDB and interrupt it during the long wait, I
always see the following Lisp backtrace:

    "parse-partial-sexp" (0x82e9c4)
    "c-literal-limits" (0x82eb14)
    "c-neutralize-syntax-in-CPP" (0x82ec64)
    "c-common-init" (0x82edb4)
    "c-mode" (0x82eef4)
    "set-auto-mode-0" (0x82f034)
    "set-auto-mode" (0x82f110)
    "normal-mode" (0x82f454)
    "after-find-file" (0x82f5a4)
    "find-file-noselect-1" (0x82f6e4)
    "find-file-noselect" (0x82f834)
    "find-file" (0x82f984)
    "call-interactively" (0x82fc04)

This seems not to be related to fontification, but rather to something
that c-neutralize-syntax-in-CPP does during C Mode initialization.