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[perl #20542] Arrayrefs coerced into hashrefs not handled correctly in some cases

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January 25, 2003 18:56
[perl #20542] Arrayrefs coerced into hashrefs not handled correctly in some cases
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This is a bug report for perl from,
generated with the help of perlbug 1.34 running under perl v5.8.0.

[Please enter your report here]

Here is a simple example of how arrayref to hashref coercion is not handled properly. Consider this script and its output:


#!/usr/bin/perl -w

use strict;
use Data::Dumper;

my %hash1 = (1=> 2, 3=>4);
my %hash2 = (1=> 2, 3=>4);
my %hash3 = (1=> 2, 3=>4);
my @array = (\%hash1, \%hash2, \%hash3);
print "Original array\n";
print Dumper @array;

my $ref = \@array;

my @newArray = values %$ref;

print "\nCoerced array\n";
print Dumper @newArray;

my @array1 = (1, 2,3);
my $ref1 = \@array1;
my @newArray1 = values %$ref1;




Original array
$VAR1 = {
          '1' => 2,
          '3' => 4
$VAR2 = {
          '1' => 2,
          '3' => 4
$VAR3 = {
          '1' => 2,
          '3' => 4

Coerced array
$VAR1 = {
          '1' => 2,
          '3' => 4
$VAR2 = undef;
Can't coerce array into hash at line 23.


Note that @array1 consisting simply of numbers generates the proper error at the end of the code. However, @array consisting of hashes does not generate an error and returns weird results.

In my code, when an arrayref was erroneously coerced into a hashref, no error message was printed. (The array contained complex objects with several levels of enclosed hashes.)  Instead, perl gobbled up a lot of memory. I have the offending object stored in Storable format if anyone's interested, but I suppose that the bad behavior above could consume too much memory for big objects.

Simon Ilyushchenko

[Please do not change anything below this line]
Site configuration information for perl v5.8.0:

Configured by bhcompile at Sun Sep  1 23:55:07 EDT 2002.

Summary of my perl5 (revision 5.0 version 8 subversion 0) configuration:
    osname=linux, osvers=2.4.18-11smp, archname=i386-linux-thread-multi
    uname='linux 2.4.18-11smp #1 smp thu aug 15 06:41:59 edt 2002 i686 i686 i386 gnulinux '
    config_args='-des -Doptimize=-O2 -march=i386 -mcpu=i686 -Dmyhostname=localhost -Dperladmin=root@localhost -Dcc=gcc -Dcf_by=Red Hat, Inc. -Dinstallprefix=/usr -Dprefix=/usr -Darchname=i386-linux -Dvendorprefix=/usr -Dsiteprefix=/usr -Duseshrplib -Dusethreads -Duseithreads -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db -Ui_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio -Dinstallusrbinperl -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less -isr'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define usemultiplicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
    cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
    optimize='-O2 -march=i386 -mcpu=i686',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -I/usr/include/gdbm'
    ccversion='', gccversion='3.2 20020822 (Red Hat Linux Rawhide 3.2-5)', 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='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 -lpthread -lc -lcrypt -lutil
    perllibs=-lnsl -ldl -lm -lpthread -lc -lcrypt -lutil
    libc=/lib/, so=so, useshrplib=true,
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic -Wl,-rpath,/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:

@INC for perl v5.8.0:

Environment for perl v5.8.0:
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PERL_BADLANG (unset)

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