From: Chong Yidong <cyd@stupidchicken.com>
To: Kenichi Handa <handa@m17n.org>
Cc: 2435@emacsbugs.donarmstrong.com
Subject: bug#2435: Bug 2435
Date: Tue, 03 Mar 2009 11:40:26 -0500 [thread overview]
Message-ID: <87zlg2a7b9.fsf@cyd.mit.edu> (raw)
In-Reply-To: <E1LePPk-0002zE-RW@etlken> (Kenichi Handa's message of "Tue, 03 Mar 2009 16:51:44 +0900")
Kenichi Handa <handa@m17n.org> writes:
>> I get a crash with the following recipe, and I think it's related to the
>> new composition code:
>>
>> emacs -Q
>> M-x customize-group RET whitespace RET
>> C-v C-v
>
> I can't reproduce the crash with that.
It doesn't happen all the time---about once every three or four
attempts. Quite strange.
> It seems that the regular expression
> tibetan-composable-pattern (which starts with "[\340\275..."
> and the byte length is surely 88) is being compiled.
> Parhaps the display routine is going to display #xF20
> (tibetan character). But, in my case, regex_compile never
> calls analyse_first at line 2853.
>
> 2846 if (many_times_ok)
> 2847 {
> 2848 boolean simple = skip_one_char (laststart) == b;
> 2849 unsigned int startoffset = 0;
> 2850 re_opcode_t ofj =
> 2851 /* Check if the loop can match the empty string. */
> 2852 (simple || !analyse_first (laststart, b, NULL, 0))
> 2853 ? on_failure_jump : on_failure_jump_loop;
>
> Here, "simple" is always set to 1, so analyse_first is not
> called.
When I get the crash, simple is set to 0.
(gdb) p b
$4 = (unsigned char *) 0x8b927b7 ""
(gdb) p laststart
$5 = (unsigned char *) 0x8b92786 "\a\201\f"
The return value of `skip_one_char (laststart)' is NULL.
> Could you please try:
> ESC : (re-search-forward tibetan-composable-pattern) RET
> in some buffer and checks if analyse_first is called?
It's called, not for the search itself but in the error handler:
#0 analyse_first (
p=0x8860bc0 "\t\002\037Previous command was not a
yank\n\001\005eval-\0164", pend=0x8860be4 "\005eval-\0164",
fastmap=0x83e3984 "", multibyte=0)
at regex.c:4022
#1 0x081aa0b5 in re_compile_fastmap (bufp=0x83e3960) at regex.c:4339
#2 0x081aa2c2 in re_search_2 (bufp=0x83e3960, str1=0x0, size1=0,
str2=0x89fa230 "Search failed:
\"[\340\275\200-\340\275\251\340\275\252][\340\276\220-\340\276\271\340\276\272\340\276\273\340\276\274]*[\340\275\260\366\220\202\216\340\275\261\340\275\262-\340\275\275\340\276\200\340\276\201\340\276\204]*[\340\275\276\340\276\202\340\276\203\340\276\206-\340\276\213\340\274\231\340\274\265\340\274\267]*\"",
size2=105, startpos=0, range=105, regs=0x0,
stop=105) at regex.c:4487
#3 0x081aa18c in re_search (bufp=0x83e3960,
string=0x89fa230 "Search failed:
\"[\340\275\200-\340\275\251\340\275\252][\340\276\220-\340\276\271\340\276\272\340\276\273\340\276\274]*[\340\275\260\366\220\202\216\340\275\261\340\275\262-\340\275\275\340\276\200\340\276\201\340\276\204]*[\340\275\276\340\276\202\340\276\203\340\276\206-\340\276\213\340\274\231\340\274\265\340\274\267]*\"",
size=105, startpos=0, range=105, regs=0x0)
at regex.c:4393
#4 0x081972f1 in fast_string_match (regexp=139244403, string=138652283)
at search.c:505
#5 0x081d3fb6 in skip_debugger (conditions=138346117, data=141320317)
at eval.c:1862
#6 0x081d4097 in maybe_call_debugger (conditions=138346117,
sig=138556777,
data=141320309) at eval.c:1889
#7 0x081d41e0 in find_handler_clause (handlers=138402201,
conditions=138346117, sig=138556777, data=141320309) at eval.c:1961
#8 0x081d3c34 in Fsignal (error_symbol=138556777, data=141320309)
at eval.c:1700
next parent reply other threads:[~2009-03-03 16:40 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <87fxhvcmvf.fsf@cyd.mit.edu>
[not found] ` <E1LePPk-0002zE-RW@etlken>
2009-03-03 16:40 ` Chong Yidong [this message]
2009-03-04 2:16 ` bug#2435: Bug 2435 Kenichi Handa
2009-03-04 4:41 ` Chong Yidong
2009-03-04 7:47 ` Kenichi Handa
2009-03-05 4:09 ` Chong Yidong
2009-03-05 6:39 ` Kenichi Handa
2009-03-05 4:42 ` Chong Yidong
2009-03-05 11:23 ` Kenichi Handa
2009-03-05 16:46 ` Stefan Monnier
2009-03-06 3:38 ` Kenichi Handa
2009-03-06 4:11 ` Chong Yidong
2009-03-06 4:48 ` Kenichi Handa
2009-03-06 5:07 ` Stefan Monnier
2009-03-06 5:21 ` Kenichi Handa
2009-03-07 4:00 ` Chong Yidong
2009-03-07 23:07 ` Stefan Monnier
2009-03-09 1:12 ` Kenichi Handa
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