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Re: [ID 20000330.005] defined ${$n} broken in 5.6 when $n is a number
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From:
Graham Barr
Date:
March 30, 2000 02:13
Subject:
Re: [ID 20000330.005] defined ${$n} broken in 5.6 when $n is a number
Message ID:
20000330111151.J18975@pobox.com
Some more info on this, If you add the line
print $1,$2,$3;
to the start of the script, it suddenly works. It would seem that
explicitly typing $1 etc adds the gv to the stash at compile time which
allows a later ${$paren} to succeed. But without them the gv does not
exist in the stash and gv_fetchpv will return undef, reguardless of if
it is a special var.
The strange thing is I cannot see any real difference in this
part of the code between 5.005_03 and 5.6
Graham.
On Thu, Mar 30, 2000 at 10:28:26AM +0100, Graham Barr wrote:
>
> This is a bug report for perl from gbarr@chipper.localdomain,
> generated with the help of perlbug 1.28 running under perl v5.6.0.
>
>
> -----------------------------------------------------------------
> [Please enter your report here]
>
> The following snippet shows the problem, with 5.005_03 it outputs
>
> a 3
> b 2
> c 1
>
> but with 5.6 it outputs the first 'a' and then loops forever.
>
> $str = "abc";
> $|=1;
> while($str =~ /(c)|(b)|(a)/g) {
> my $paren = 1;
> print "$+ ";
> $paren++ until defined ${$paren};
> print "$paren\n";
> }
>
> I know that in 5.6 I could use @- to do this, but I have this
> structure in code that is already in use and needs to continue
> to work with older versions of perl
>
> Graham.
>
> [Please do not change anything below this line]
> -----------------------------------------------------------------
> ---
> Flags:
> category=core
> severity=high
> ---
> Site configuration information for perl v5.6.0:
>
> Configured by gbarr at Wed Mar 29 16:49:13 BST 2000.
>
> Summary of my perl5 (revision 5.0 version 6 subversion 0) configuration:
> Platform:
> osname=linux, osvers=2.2.13, archname=i686-linux
> uname='linux chipper 2.2.13 #1 mon nov 8 15:37:25 cet 1999 i686 unknown '
> config_args='-des'
> hint=recommended, useposix=true, d_sigaction=define
> usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
> useperlio=undef d_sfio=undef uselargefiles=define
> use64bitint=undef use64bitall=undef uselongdouble=undef usesocks=undef
> Compiler:
> cc='cc', optimize='-O2', gccversion=egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)
> cppflags='-fno-strict-aliasing -I/usr/local/include'
> ccflags ='-fno-strict-aliasing -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
> 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=8
> alignbytes=4, usemymalloc=n, prototype=define
> Linker and Libraries:
> ld='cc', ldflags =' -L/usr/local/lib'
> libpth=/usr/local/lib /lib /usr/lib
> libs=-lnsl -lndbm -lgdbm -ldbm -ldb -ldl -lm -lc -lposix -lcrypt
> libc=, so=so, useshrplib=false, libperl=libperl.a
> Dynamic Linking:
> dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
> cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'
>
> Locally applied patches:
>
>
> ---
> @INC for perl v5.6.0:
> /home/value/perl
> /usr/local/lib/perl5/5.6.0/i686-linux
> /usr/local/lib/perl5/5.6.0
> /usr/local/lib/perl5/site_perl/5.6.0/i686-linux
> /usr/local/lib/perl5/site_perl/5.6.0
> /usr/local/lib/perl5/site_perl
> .
>
> ---
> Environment for perl v5.6.0:
> HOME=/home/gbarr
> LANG=POSIX
> LANGUAGE (unset)
> LD_LIBRARY_PATH (unset)
> LOGDIR (unset)
> PATH=/home/gbarr/bin:/usr/local/bin:/usr/bin:/usr/X11R6/bin:/bin:/usr/games/bin:/usr/games:/opt/gnome/bin:/opt/kde/bin:.
> PERL5LIB=/home/value/perl
> PERL_BADLANG (unset)
> SHELL=/usr/bin/zsh
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