[Moscow.pm] Почему код так работает?
Vladimir V. Perepelitsa
inthrax на gmail.com
Пт Май 30 07:57:53 PDT 2008
On Friday 30 May 2008 18:57:14 Andrew Shitov wrote:
> А как это воспроизвести?
>
> Linux:
>
> main: SCALAR(0x8149868) at 1.pl line 5.
> func1: SCALAR(0x8149868) at 1.pl line 8.
> func2: SCALAR(0x8149868) at 1.pl line 10.
> func2: SCALAR(0x8149868) at 1.pl line 10.
> func2: SCALAR(0x8149868) at 1.pl line 10.
> func2: SCALAR(0x8149868) at 1.pl line 10.
> func2: SCALAR(0x8149868) at 1.pl line 10.
> func2: SCALAR(0x8149868) at 1.pl line 10.
хм...
$ perl
use strict;
use warnings;
my $test = 10;
warn 'main: ', \$test;
my $func1 = sub {
warn 'func1: ', \$test;
sub func2 {
warn 'func2: ', \$test;
}
};
$func1->();
func2();
func2();
func2();
func2();
func2();
func2();
main: SCALAR(0x815b834) at - line 5.
func1: SCALAR(0x815b834) at - line 8.
func2: SCALAR(0x819a000) at - line 10.
func2: SCALAR(0x8199fdc) at - line 10.
func2: SCALAR(0x819a000) at - line 10.
func2: SCALAR(0x8199fdc) at - line 10.
func2: SCALAR(0x819a000) at - line 10.
func2: SCALAR(0x8199fdc) at - line 10.
------
$ perl -V
Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
Platform:
osname=linux, osvers=2.6.24-tuxonice-r2-undef,
archname=i686-linux-thread-multi
uname='linux undef 2.6.24-tuxonice-r2-undef #7 smp mon mar 24 22:01:54 msk
2008 i686 intel(r) celeron(r) cpu 2.50ghz genuineintel gnulinux '
config_args='-des -Darchname=i686-linux-thread -Dcccdlflags=-fPIC -Dccdlflags=-rdynamic -Dcc=i686-pc-linux-gnu-gcc -Dprefix=/usr -Dvendorprefix=/usr -Dsiteprefix=/usr -Dlocincpth= -Doptimize=-O2 -march=pentium4 -fomit-frame-pointer -pipe -Duselargefiles -Dd_semctl_semun -Dscriptdir=/usr/bin -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dinstallman1dir=/usr/share/man/man1 -Dinstallman3dir=/usr/share/man/man3 -Dman1ext=1 -Dman3ext=3pm -Dinc_version_list=5.8.0
5.8.0/i686-linux-thread-multi 5.8.2 5.8.2/i686-linux-thread-multi 5.8.4
5.8.4/i686-linux-thread-multi 5.8.5 5.8.5/i686-linux-thread-multi 5.8.6
5.8.6/i686-linux-thread-multi 5.8.7
5.8.7/i686-linux-thread-multi -Dcf_by=Gentoo -Ud_csh -Dusenm -Dusethreads -Ui_ndbm -Ui_gdbm -Di_db'
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
Compiler:
cc='i686-pc-linux-gnu-gcc', ccflags
='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -fno-strict-aliasing -pipe -Wdeclaration-after-statement -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm',
optimize='-O2 -march=pentium4 -fomit-frame-pointer -pipe',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/include/gdbm'
ccversion='', gccversion='4.2.3 (Gentoo 4.2.3 p1.0)', 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='i686-pc-linux-gnu-gcc', ldflags =' -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
libc=/lib/libc-2.7.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.7'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'
Characteristics of this binary (from libperl):
Compile-time options: MULTIPLICITY PERL_IMPLICIT_CONTEXT
PERL_MALLOC_WRAP THREADS_HAVE_PIDS USE_ITHREADS
USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API
Built under linux
Compiled at May 12 2008 12:16:56
@INC:
/etc/perl
/usr/lib/perl5/vendor_perl/5.8.8/i686-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.8
/usr/lib/perl5/vendor_perl
/usr/lib/perl5/site_perl/5.8.8/i686-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.8
/usr/lib/perl5/site_perl
/usr/lib/perl5/5.8.8/i686-linux-thread-multi
/usr/lib/perl5/5.8.8
/usr/local/lib/site_perl
--
Vladimir Perepelitsa aka Mons Anderson
<inthrax на gmail.com> / #99779956
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