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[perl #79908] my $x; sub(){$x} makes a constant even if $x changes
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From:
Father Chrysostomos
Date:
November 28, 2010 17:16
Subject:
[perl #79908] my $x; sub(){$x} makes a constant even if $x changes
Message ID:
rt-3.6.HEAD-13564-1290993388-1215.79908-75-0@perl.org
# New Ticket Created by Father Chrysostomos
# Please include the string: [perl #79908]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=79908 >
I know this is what constant.pm used to use, but it causes a bug:
$ perl -MO=Deparse -e' BEGIN{my $x = 5; *foo = sub(){$x}; $x=6} print foo'
sub BEGIN {
my $x = 5;
*foo = sub () {
$x;
}
;
$x = 6;
}
print 5;
Maybe the optimisation could be changed so that it is only triggered for read-only variables.
---
Flags:
category=core
severity=low
---
Site configuration information for perl 5.13.7:
Configured by sprout at Sat Nov 27 06:17:45 PST 2010.
Summary of my perl5 (revision 5 version 13 subversion 7) configuration:
Commit id: b373eab86ddbda75272f61867b2520cfb9813d89
Platform:
osname=darwin, osvers=10.4.0, archname=darwin-2level
uname='darwin pint.local 10.4.0 darwin kernel version 10.4.0: fri apr 23 18:28:53 pdt 2010; root:xnu-1504.7.4~1release_i386 i386 '
config_args='-de -Dusedevel -DDEBUGGING'
hint=recommended, useposix=true, d_sigaction=define
useithreads=undef, usemultiplicity=undef
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=undef, use64bitall=undef, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-fno-common -DPERL_DARWIN -no-cpp-precomp -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include',
optimize='-O3 -g',
cppflags='-no-cpp-precomp -fno-common -DPERL_DARWIN -no-cpp-precomp -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
ccversion='', gccversion='4.2.1 (Apple Inc. build 5664)', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -fstack-protector -L/usr/local/lib'
libpth=/usr/local/lib /usr/lib
libs=-ldbm -ldl -lm -lutil -lc
perllibs=-ldl -lm -lutil -lc
libc=/usr/lib/libc.dylib, so=dylib, useshrplib=false, libperl=libperl.a
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector'
Locally applied patches:
---
@INC for perl 5.13.7:
/usr/local/lib/perl5/site_perl/5.13.7/darwin-2level
/usr/local/lib/perl5/site_perl/5.13.7
/usr/local/lib/perl5/5.13.7/darwin-2level
/usr/local/lib/perl5/5.13.7
/usr/local/lib/perl5/site_perl
.
---
Environment for perl 5.13.7:
DYLD_LIBRARY_PATH (unset)
HOME=/Users/sprout
LANG=en_US.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/local/bin
PERL_BADLANG (unset)
SHELL=/bin/bash
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[perl #79908] my $x; sub(){$x} makes a constant even if $x changes
by Father Chrysostomos