caller does not return right info #15147

p5pRT · 2016-01-26T16:59:19Z

Migrated from rt.perl.org#127377 (status was 'open')

Searchable as RT127377$

p5pRT · 2016-01-26T16:59:19Z

From @KES777

Created by @KES777

$ cat t2.pl
#!/usr/bin/env perl

sub t1 {
print "@{[ (caller(0))[0..3] ]}\n";
return 7;
}

unless( my $x = t1() || $x < 8 ) {
1;
}
elsif( my $y = t1() ) {
1;
}

$ t2.pl
main ./t2.pl 8 main::t1
main ./t2.pl 11 main::t1

$ perl -d t2.pl

Loading DB routines from perl5db.pl version 1.49
Editor support available.

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

main::(t2.pl:8): unless( my $x = t1() || $x < 8 ) {
DB<1> c
main t2.pl 8 main::t1
main t2.pl 8 main::t1
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.

As you can see the second call to t1 returns wrong line number 8 intead of expected 11
when the program were run with -d flag.

Perl Info


Flags:
    category=core
    severity=high

Site configuration information for perl 5.22.0:

Configured by kes at Sun Nov 1 00:25:11 EET 2015.

Summary of my perl5 (revision 5 version 22 subversion 0) configuration:

  Platform:
    osname=linux, osvers=3.13.0-37-generic, archname=x86_64-linux
    uname='linux kes-desktop 3.13.0-37-generic #64-ubuntu smp mon sep 22 21:28:38 utc 2014 x86_64 x86_64 x86_64 gnulinux '
    config_args='-des -Dprefix=/home/kes/localperl'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.8.4', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678, doublekind=3
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16, longdblkind=3
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib
    libs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.19.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.19'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector'



@INC for perl 5.22.0:
    /home/kes/localperl_libs/lib/perl5/x86_64-linux
    /home/kes/localperl_libs/lib/perl5
    /home/kes/localperl/lib/site_perl/5.22.0/x86_64-linux
    /home/kes/localperl/lib/site_perl/5.22.0
    /home/kes/localperl/lib/5.22.0/x86_64-linux
    /home/kes/localperl/lib/5.22.0
    .


Environment for perl 5.22.0:
    HOME=/home/kes
    LANG=ru_UA.UTF-8
    LANGUAGE=en
    LC_MESSAGES=en_US.UTF-8
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/kes/localperl/bin:/home/kes/localperl_libs/bin:/home/kes/localperl/bin:/home/kes/localperl_libs/bin:/home/kes/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
    PERL5LIB=/home/kes/localperl_libs/lib/perl5
    PERL_BADLANG (unset)
    PERL_MB_OPT=--install_base "/home/kes/localperl_libs"
    PERL_MM_OPT=INSTALL_BASE=/home/kes/localperl_libs
    SHELL=/bin/bash

p5pRT · 2016-01-27T23:31:01Z

From @jkeenan

On Tue Jan 26 08:59:19 2016, kes-kes@yandex.ru wrote:

Cc: kes-kes@yandex.ru
From: kes-kes@yandex.ru
Subject: caller does not return right info
To: perlbug@perl.org
Reply-To: kes-kes@yandex.ru
Message-Id: <5.22.0_7499_1453758880@kes-desktop>

This is a bug report for perl from kes-kes@yandex.ru,
generated with the help of perlbug 1.40 running under perl 5.22.0.

-----------------------------------------------------------------
[Please describe your issue here]

$ cat t2.pl
#!/usr/bin/env perl

sub t1 {
    print "@{[ (caller(0))[0..3] ]}\n";
    return 7;
}

unless( my $x = t1() || $x < 8 ) {
    1;
}
elsif( my $y = t1() ) {
    1;
}

$ t2.pl
main ./t2.pl 8 main::t1
main ./t2.pl 11 main::t1

$ perl -d t2.pl

Loading DB routines from perl5db.pl version 1.49
Editor support available.

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

main::(t2.pl:8): unless( my $x = t1() || $x < 8 ) {
  DB<1> c
main t2.pl 8 main::t1
main t2.pl 8 main::t1
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.

As you can see the second call to t1 returns wrong line number 8
intead of expected 11
when the program were run with -d flag.

I can confirm that there is a difference in the output of this program between being run by itself and being run thru the debugger.

Whether this is a *severe* problem is open to discussion.

Thank you very much.

--
James E Keenan (jkeenan@cpan.org)

p5pRT · 2016-01-27T23:31:01Z

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

p5pRT added Severity High distro-Linux type-core labels Oct 19, 2019

xenu removed affects-5.22 labels Nov 19, 2021

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caller does not return right info #15147

caller does not return right info #15147

p5pRT commented Jan 26, 2016

p5pRT commented Jan 26, 2016

p5pRT commented Jan 27, 2016

p5pRT commented Jan 27, 2016

caller does not return right info #15147

caller does not return right info #15147

Comments

p5pRT commented Jan 26, 2016

p5pRT commented Jan 26, 2016

From @KES777

Created by @KES777

p5pRT commented Jan 27, 2016

From @jkeenan

p5pRT commented Jan 27, 2016