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[perl #36532] Methods with lvalue attrib fail in debugger

From:
kynn jones
Date:
July 14, 2005 02:11
Subject:
[perl #36532] Methods with lvalue attrib fail in debugger
Message ID:
rt-3.0.11-36532-117209.9.46774134331257@perl.org
# New Ticket Created by  kynn jones 
# Please include the string:  [perl #36532]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/rt3/Ticket/Display.html?id=36532 >




This is a bug report for perl from kynn@panix.com
generated with the help of perlbug 1.35 running under perl v5.8.6.


-----------------------------------------------------------------
[Please enter your report here]

Subs defined with the lvalue attribute are unrecognized or mishandled
when running inside the Perl debugger.  For example the following
script runs fine on the command line but fails in the debugger.

# test_script.pl
use strict;
use warnings;

my $var = 0;

sub foo : lvalue {
  $var;
}

foo = 1;
die "\$var unchanged ($var)" unless $var;  # fails in debugger

print "OK: $var\n";

__END__

% perl test_script.pl
OK: 1
% perl -d test_script.pl

Loading DB routines from perl5db.pl version 1.28
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(test_script.pl:4):       my $var = 0;
main::(test_script.pl:5):       sub foo : lvalue {
  DB<1> c
$var unchanged (0)
 at test_script.pl line 12
Debugged program terminated.  Use q to quit or R to restart,
  use O inhibit_exit to avoid stopping after program termination,
  h q, h R or h O to get additional info.


[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
    category=library
    severity=medium
---
Site configuration information for perl v5.8.6:

Configured by kynn at Tue Apr 12 12:24:11 EDT 2005.

Summary of my perl5 (revision 5 version 8 subversion 6) configuration:
  Platform:
    osname=linux, osvers=2.4.18-686-smp, archname=i686-linux-ld
    uname='linux luna 2.4.18-686-smp #1 smp sun apr 14 12:07:19 est 2002 i686 unknown '
    config_args=''
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=define
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='2.95.4 20011002 (Debian prerelease)', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='long double', nvsize=12, Off_t='off_t', lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lgdbm -ldbm -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
    libc=/lib/libc-2.2.5.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.2.5'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.8.6:
    /home/kynn/local/lib/perl/my
    /home/kynn/local/lib/perl/5.8.4
    /home/kynn/local/lib/perl/5.6.1
    /home/kynn/local/lib/perl5/5.8.6/i686-linux-ld
    /home/kynn/local/lib/perl5/5.8.6
    /home/kynn/local/lib/perl5/i686-linux-ld
    /home/kynn/local/lib/perl5
    /home/kynn/local/lib/perl5/5.8.6/i686-linux-ld
    /home/kynn/local/lib/perl5/5.8.6
    /home/kynn/local/lib/perl5/site_perl/5.8.6/i686-linux-ld
    /home/kynn/local/lib/perl5/site_perl/5.8.6
    /home/kynn/local/lib/perl5/site_perl
    .

---
Environment for perl v5.8.6:
    HOME=/home/kynn
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/home/kynn/local/lib:/opt/java/jdk/lib/i386
    LOGDIR (unset)
    PATH=.:/home/kynn/local/bin:/home/kynn/local/usr/bin:/home/kynn/local/local/bin:/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin:/home/kynn/java/javacc/bin:/opt/java/jdk/bin:/usr/pbs/bin:/home/kynn/opt/ant/bin
    PERL5LIB=/home/kynn/local/lib/perl/my:/home/kynn/local/lib/perl/5.8.4:/home/kynn/local/lib/perl/5.6.1:/home/kynn/local/lib/perl5
    PERL5_CPANPLUS_CONFIG=/home/kynn/.cpanplus/config
    PERL_BADLANG (unset)
    SHELL=/usr/bin/zsh




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