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"my" variable is treated as a static variable under certain circumstance #8778

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p5pRT opened this issue Feb 17, 2007 · 4 comments
Closed

"my" variable is treated as a static variable under certain circumstance #8778

p5pRT opened this issue Feb 17, 2007 · 4 comments
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distro-Linux my-in-false-conditional type-core

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@p5pRT
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p5pRT commented Feb 17, 2007

Migrated from rt.perl.org#41526 (status was 'resolved')

Searchable as RT41526$
@p5pRT
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p5pRT commented Feb 17, 2007

From mmonopole-star@yahoo.com

Created by mmonopole-star@yahoo.com

"my" variable is treated as a static variable under certain circumstance.
Below is a sample code​:

=======================
#! /usr/local/bin/perl

use strict;
use warnings;

sub f($)
{
  my $arg = shift;

  my $x = 'a' if (0);

  $x ||= $arg;

  print "$x\n";
}

f('b');
f('c');

It should print out
b
c

Instead, it actually prints out
b
b

The value of $x is persisted across functional calls.

Perl Info 

Flags:
    category=core
    severity=high

Site configuration information for perl v5.8.6:

Configured by mschilli at Fri Oct 20 17:26:31 EDT 2006.

Summary of my perl5 (revision 5 version 8 subversion 6) configuration:
  Platform:
    osname=linux, osvers=linux, archname=i686-linux-64int
    uname='linux pkgbuild6.corp.yahoo.com linux #1 fri oct 3 18:13:58 edt 2003 i686 '
    config_args='-d -e'
    hint=previous, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=define use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -I/usr/local/include -I/usr/include/gdbm -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm'
    ccversion='', gccversion='3.2.3 20030502 (Red Hat Linux 3.2.3-20)', 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='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.3.2.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.3.2'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-R/home/y/lib -Wl,-R/usr/local/lib'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    


@INC for perl v5.8.6:
    /home/y/lib
    /home/y/lib/perl5/5.8.6/i686-linux-64int
    /home/y/lib/perl5/5.8.6
    /home/y/lib/perl5
    /home/y/lib/perl5/site_perl/5.8.6/i686-linux-64int
    /home/y/lib/perl5/site_perl/5.8.6
    /home/y/lib/perl5/site_perl
    /home/hongj/projects/goto/src/perlsrc
    /home/hongj/projects/goto/lib/perllib
    /home/hongj/projects/goto/lib/perl5/5.8.6/i686-linux-64int
    /home/hongj/projects/goto/lib/perl5/5.8.6
    /home/hongj/projects/goto/lib/perl5
    /home/hongj/projects/goto/lib/perl5/site_perl/5.8.6/i686-linux-64int
    /home/hongj/projects/goto/lib/perl5/site_perl/5.8.6
    /home/hongj/projects/goto/lib/perl5/site_perl
    /home/y/lib
    /home/y/lib/perl5/5.8.6/i686-linux-64int
    /home/y/lib/perl5/5.8.6
    /home/y/lib/perl5
    /home/y/lib/perl5/site_perl/5.8.6/i686-linux-64int
    /home/y/lib/perl5/site_perl/5.8.6
    /home/y/lib/perl5/site_perl
    /home/hongj/projects/goto/src/perlsrc
    /home/hongj/projects/goto/lib/perllib
    /home/hongj/projects/goto/lib/perl5/5.8.6/i686-linux-64int
    /home/hongj/projects/goto/lib/perl5/5.8.6
    /home/hongj/projects/goto/lib/perl5
    /home/hongj/projects/goto/lib/perl5/site_perl/5.8.6/i686-linux-64int
    /home/hongj/projects/goto/lib/perl5/site_perl/5.8.6
    /home/hongj/projects/goto/lib/perl5/site_perl
    /home/hongj/projects/dmr/assoc/matching-pipeline/bin
    /usr/local/lib/jma/basisxs
    /usr/local/lib/jma/basisxs2
    /usr/local/lib/kma_20040128/krbasisxs
    /usr/local/lib/cma/xs
    /usr/local/lib/jma/basisxs
    /usr/local/lib/jma/basisxs2
    /usr/local/lib/kma_20040128/krbasisxs
    /usr/local/lib/cma/xs
    /home/y/lib/perl5/5.8/i686-linux-64int
    /home/y/lib/perl5/5.8
    /home/y/lib/perl5/site_perl/5.8/i686-linux-64int
    /home/y/lib/perl5/site_perl/5.8
    /home/y/lib/perl5/site_perl/5.8
    /home/y/lib/perl5/site_perl/5.8.6/i686-linux-64int
    /home/y/lib/perl5/site_perl/5.8.6
    /home/y/lib/perl5/site_perl
    /home/y/lib/perl5/5.8.6/i686-linux-64int
    /home/y/lib/perl5/5.8.6
    /home/y/lib/perl5/5.8.6/i686-linux-64int
    /home/y/lib/perl5/site_perl/5.8.6/i686-linux-64int
    /home/y/lib/perl5/site_perl/5.8.6
    /home/y/lib/perl5/site_perl/5.8.6/i686-linux-64int
    .


Environment for perl v5.8.6:
    HOME=/home/hongj
    LANG=en_US.UTF-8
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/home/hongj/projects/goto/lib:/home/y/lib:/home/hongj/projects/goto/lib:/usr/local/lib:/usr/local/lib/jma/jni:/usr/local/lib/kma_20040128/jni:/usr/local/lib/jma/rosette:/usr/local/lib/cma:/usr/local/lib/cma/jni:/home/hongj/projects/goto/lib:/home/y/lib:/home/y/lib:/usr/local/lib:/home/hongj/projects/goto/lib:/usr/local/lib:/usr/local/lib/jma/jni:/usr/local/lib/kma_20040128/jni:/usr/local/lib/jma/rosette:/usr/local/lib/cma:/usr/local/lib/cma/jni:/home/hongj/projects/goto/lib:/home/y/lib:/home/y/lib:/home/y/libexec/weblogic/server/lib/linux:/home/hongj/projects/goto/thirdparty/wordnet1.7/lib:/home/hongj/projects/goto/thirdparty/rainbow/lib:/usr/local/oracle/product/9.2/lib:/usr/local/oracle/product/9.2/lib:/usr/local/oracle/product/9.2/lib
    LOGDIR (unset)
    PATH=/home/y/libexec/java/bin:/home/y/bin:/home/y/libexec/java/bin:/home/y/bin:/home/y/libexec/java/bin:/home/y/bin:/home/y/libexec/over_build_tools/wbin:/home/y/bin:/home/y/bin:/home/y/sbin:/usr/kerberos/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/home/hongj/bin:/home/y/libexec/over_build_tools/bin:/usr/local/bin:/home/hongj/projects/goto/bin:/usr/local/javaware/bin:/usr/local/oracle/product/9.2/bin:/usr/local/inicis:/usr/local/oracle/product/9.2/bin:/usr/local/oracle/product/9.2/bin
    PERL5LIB=/home/y/lib:/home/y/lib/perl5:/home/y/lib/perl5/site_perl:/home/hongj/projects/goto/src/perlsrc:/home/hongj/projects/goto/lib/perllib:/home/hongj/projects/goto/lib/perl5:/home/hongj/projects/goto/lib/perl5/site_perl:/home/y/lib:/home/y/lib/perl5:/home/y/lib/perl5/site_perl:/home/hongj/projects/goto/src/perlsrc:/home/hongj/projects/goto/lib/perllib:/home/hongj/projects/goto/lib/perl5:/home/hongj/projects/goto/lib/perl5/site_perl:/home/hongj/projects/dmr/assoc/matching-pipeline/bin::/usr/local/lib/jma/basisxs:/usr/local/lib/jma/basisxs2:/usr/local/lib/kma_20040128/krbasisxs:/usr/local/lib/cma/xs:/usr/local/lib/jma/basisxs:/usr/local/lib/jma/basisxs2:/usr/local/lib/kma_20040128/krbasisxs:/usr/local/lib/cma/xs
    PERL_BADLANG (unset)
    SHELL=/bin/zsh

@p5pRT
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p5pRT commented Feb 17, 2007

From @rgarcia

On 17/02/07, via RT John <perlbug-followup@​perl.org> wrote​:

"my" variable is treated as a static variable under certain circumstance.

Right. The construct "my $x if 0" will be deprecated in perl 5.10
(with a deprecation warning). Additionnally, a new keyword state()
will be introduced, to declare static variables.

@p5pRT
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p5pRT commented Feb 17, 2007

The RT System itself - Status changed from 'new' to 'open'

@p5pRT
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p5pRT commented Feb 17, 2007

@rgs - Status changed from 'open' to 'resolved'

@p5pRT p5pRT closed this as completed Feb 17, 2007
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