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[perl #114282] Regex optimizer fails with mixture of EXACT, and EXACTFU

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From:
karl williamson
Date:
July 26, 2012 17:35
Subject:
[perl #114282] Regex optimizer fails with mixture of EXACT, and EXACTFU
Message ID:
rt-3.6.HEAD-11172-1343349308-659.114282-75-0@perl.org
# New Ticket Created by  karl williamson 
# Please include the string:  [perl #114282]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=114282 >


This is a bug report for perl from khw@karl.(none),
generated with the help of perlbug 1.39 running under perl 5.17.3.


-----------------------------------------------------------------
This fails:
perl -Mre=Debug,COMPILE,EXECUTE -le ' my $c = "\x{0130}_"; my $p = 
qr/(?u:((?i:\x{0049}\x{0307}),?)_)/; print $c =~ $p;'

It should succeed because the fold of x{130} is \x49\x{307}, and the
comma is optional.  It compiles correctly, but we get the following
output:

floating utf8 "_" at 2..3 (checking floating) stclass EXACTFU <i\x{307}>
minlen  3
r->extflags: USE_INTUIT_NOML USE_INTUIT_ML UNICODE
Guessing start of match in sv for REx
"(?u:((?i:\x{0049}\x{0307}),?)_)" against  "%x{130}_"
UTF-8 pattern and string...
Did not find floating substr "_"...
Match rejected by optimizer


It succeeds if the underscore is changed into "(?i:_)".  This means the 
combination of EXACT and EXACTFish nodes causes the problem.

-----------------------------------------------------------------
---
Flags:
     category=core
     severity=medium
---
Site configuration information for perl 5.17.3:

Configured by khw at Thu Jul 26 08:28:09 MDT 2012.

Summary of my perl5 (revision 5 version 17 subversion 3) configuration:
   Commit id: 43cd5cb7e818c8635f51ef56a15b50d3dadbc735
   Platform:
     osname=linux, osvers=2.6.35-32-generic-pae, 
archname=i686-linux-thread-multi-64int-ld
     uname='linux karl 2.6.35-32-generic-pae #67-ubuntu smp mon mar 5 
21:23:19 utc 2012 i686 gnulinux '
     config_args='-des -Dprefix=/home/khw/blead -Dusedevel 
-D'optimize=-ggdb3' -A'optimize=-ggdb3' -A'optimize=-O0' -Dman1dir=none 
-Dman3dir=none -DDEBUGGING -Dcc=g++ -Dusemorebits -Dusethreads'
     hint=recommended, useposix=true, d_sigaction=define
     useithreads=define, usemultiplicity=define
     useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
     use64bitint=define, use64bitall=undef, uselongdouble=define
     usemymalloc=n, bincompat5005=undef
   Compiler:
     cc='g++', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING 
-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include 
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
     optimize='-O0 -ggdb3',
     cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBUGGING 
-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
     ccversion='', gccversion='4.4.5', gccosandvers=''
     intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
     d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
     ivtype='long long', ivsize=8, nvtype='long double', nvsize=12, 
Off_t='off_t', lseeksize=8
     alignbytes=4, prototype=define
   Linker and Libraries:
     ld='g++', ldflags =' -fstack-protector -L/usr/local/lib'
     libpth=/usr/local/lib /lib/../lib /usr/lib/../lib /lib /usr/lib 
/usr/lib/i686-linux-gnu
     libs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
     perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
     libc=/lib/../lib/libc.so.6, so=so, useshrplib=false, libperl=libperl.a
     gnulibc_version='2.12'
   Dynamic Linking:
     dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
     cccdlflags='-fPIC', lddlflags='-shared -ggdb3 -ggdb3 -O0 
-L/usr/local/lib -fstack-protector'

Locally applied patches:


---
@INC for perl 5.17.3:
 
/home/khw/blead/lib/perl5/site_perl/5.17.3/i686-linux-thread-multi-64int-ld
     /home/khw/blead/lib/perl5/site_perl/5.17.3
     /home/khw/blead/lib/perl5/5.17.3/i686-linux-thread-multi-64int-ld
     /home/khw/blead/lib/perl5/5.17.3
     /home/khw/blead/lib/perl5/site_perl
     .

---
Environment for perl 5.17.3:
     HOME=/home/khw
     LANG=en_US.UTF-8
     LANGUAGE=en_US:en
     LD_LIBRARY_PATH (unset)
     LOGDIR (unset)
 
PATH=/home/khw/bin:/home/khw/print/bin:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/usr/games:/home/khw/cxoffice/bin
     PERL5OPT=-w
     PERL_BADLANG (unset)
     SHELL=/bin/ksh


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