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[perl #5664] Bug in weak references
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From:
Steve Peters via RT
Date:
December 23, 2006 09:00
Subject:
[perl #5664] Bug in weak references
Message ID:
rt-3.6.HEAD-1774-1166893239-981.5664-15-0@perl.org
On Thu Feb 01 23:25:52 2001, me-01@ton.iguana.be wrote:
>
> -----------------------------------------------------------------
> [Please enter your report here]
>
> perl -wle 'use Data::Dumper; use WeakRef; $foo = [1]; $baz=$foo; push
> @baz, weaken($foo); print Dumper \@baz; print Dumper $foo;'
>
> @baz will be unexpectedly empty.
> (PS: why do I not get a warning that I use $baz only once ?)
>
> [Please do not change anything below this line]
> -----------------------------------------------------------------
> ---
> Flags:
> category=core
> severity=low
> ---
> Site configuration information for perl v5.6.0:
>
> Configured by ton at Wed Aug 9 23:24:07 CEST 2000.
>
> Summary of my perl5 (revision 5.0 version 6 subversion 0)
> configuration:
> Platform:
> osname=linux, osvers=2.4.0-test5, archname=i686-linux
> uname='linux quasar 2.4.0-test5 #2 sat jul 29 04:45:14 cest 2000
> i686 unknown '
> config_args=''
> hint=recommended, useposix=true, d_sigaction=define
> usethreads=undef use5005threads=undef useithreads=undef
> usemultiplicity=undef
> useperlio=undef d_sfio=undef uselargefiles=undef
> use64bitint=undef use64bitall=undef uselongdouble=undef
> usesocks=undef
> Compiler:
> cc='cc', optimize='-O2 -fomit-frame-pointer', gccversion=egcs-
> 2.91.66 19990314 (egcs-1.1.2 release), gccosandvers=
> cppflags='-fno-strict-aliasing -I/usr/local/include'
> ccflags ='-fno-strict-aliasing -I/usr/local/include'
> stdchar='char', d_stdstdio=define, usevfork=false
> intsize=4, longsize=4, ptrsize=4, doublesize=8
> d_longlong=define, longlongsize=8, d_longdbl=define,
> longdblsize=12
> ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
> lseeksize=4
> alignbytes=4, usemymalloc=y, prototype=define
> Linker and Libraries:
> ld='cc', ldflags =' -L/usr/local/lib -L/opt/gnu/lib'
> libpth=/usr/local/lib /opt/gnu/lib /lib /usr/lib
> libs=-lnsl -lndbm -ldl -lm -lc -lposix -lcrypt -lutil
> libc=/lib/libc-2.1.1.so, so=so, useshrplib=true,
> libperl=libperl.so
> Dynamic Linking:
> dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-
> rdynamic -Wl,-rpath,/usr/lib/perl5/5.6.0/i686-linux/CORE'
> cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib
> -L/opt/gnu/lib'
>
> Locally applied patches:
>
>
> ---
> @INC for perl v5.6.0:
> /usr/lib/perl5/5.6.0/i686-linux
> /usr/lib/perl5/5.6.0
> /usr/lib/perl5/site_perl/5.6.0/i686-linux
> /usr/lib/perl5/site_perl/5.6.0
> /usr/lib/perl5/site_perl
> .
>
> ---
> Environment for perl v5.6.0:
> HOME=/home/ton
> LANG (unset)
> LANGUAGE (unset)
> LD_LIBRARY_PATH (unset)
> LOGDIR (unset)
>
PATH=/home/ton/bin.Linux:/home/ton/bin:/home/ton/bin.SampleSetup:/usr/local/bin:/usr/local/sbin:/usr/local/jre/bin:/usr/local/jdk116_v5/bin:/home/oracle/product/8.1.5/bin:/usr/games/bin:/usr/X11R6/bin:/usr/share/bin:/usr/bin:/usr/sbin:/bin:/sbin:.
> PERL_BADLANG (unset)
> SHELL=/bin/bash
I'm guessing WeakRef is the predecessor to Scalar::Util. Replacing with
Scalar::Util, I get similar results.
steve@enterprise:~> perl -wle 'use Data::Dumper; use Scalar::Util
qw(weaken); $foo = [1]; $baz=$foo; push @baz, weaken($foo); print Dumper
\@baz; print Dumper $foo;'
$VAR1 = [];
$VAR1 = [
1
];
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