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global got SIGABRT when analyzing long line

Subject: global got SIGABRT when analyzing long line
Date: Fri, 29 Jan 2016 15:08:03 +0900 (JST)


This is a bug reaport that I got SIGABRT during running global.
This can be reproduced with the latest global-6.5.2.

What is your environment (OS)?
OS: CentOS 5.11, 6.7(Linux x86_64)

Which version of GLOBAL are you using?

What did you do? (command line)
1. create 2 files, both have only 1 line:
    a:c    int abc() {};
    a.html <a name="name">link</a>aaaaaaaaaaaaa....
        (continues 5000 'a's without '\n')
2. run gtags
    # gtags --gtagsconf /etc/gtags.conf --gtagslabel=exuberant-ctags
    (which tags .c with default parser and .html with exuberant-ctags)
3. run global
    # global -x ".*"

What did you expect from it?
global shows the labels.

What was occurred? (as is)
global displays:
=== 8< ======
abc   1 a.c     int abc() {}
name  1 a.html  <a name="name">link</a>aaaaa(snip 5000 'a's)
Aborted (core dumped)
=== 8< ======

gdb for the core file shows that it aborted in obstack_free().

# gdb /usr/bin/global core.24954
(gdb) where
#1  0x0000003946c31a70 in abort () at abort.c
#2  0x0000003946c7837b in obstack_free () at obstack.c
#3  0x00000000004166ca in gtags_next () at gtagsop.c
#4  0x0000000000402ac1 in search () at global.c
#5  0x0000000000402bb2 in tagsearch () at global.c
#6  0x0000000000405b6e in main () at global.c

Actually, I found two interesting workarounds:
A. reduce a line width less than 4000 chars in a.html(by inserting '\n')
B. rename the function name from abc() to xbc() in a.c

This seems to be caused by the shortage of the chunk_size of
obstack which is initialized to 4096-extra, since this can
roughly be avoided by replacing "obstack_init(&pool->obstack);"
in pool_open() in libutil/pool.c to:

   _obstack_begin ((&pool->obstack), 8192, 0,
               (void *(*) (long)) obstack_chunk_alloc,
               (void (*) (void *)) obstack_chunk_free);
          pool->first_object = obstack_alloc(&pool->obstack, 1);

to increase the default chunk_size.
However I know this is not good fix, and I can not explain
why the workaround B is available...

It is better that global can handle vaious line width.
But It would be O.K. global has a restriction that line width
should be 4000 chars. If so, please print a detailed
error message which indicates the reason why global fails
at the case.


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