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Deparse -x3 loses "for" initialiser #16223

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p5pRT opened this issue Nov 4, 2017 · 3 comments
Open

Deparse -x3 loses "for" initialiser #16223

p5pRT opened this issue Nov 4, 2017 · 3 comments
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type-library

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@p5pRT
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p5pRT commented Nov 4, 2017

Migrated from rt.perl.org#132397 (status was 'open')

Searchable as RT132397$
@p5pRT
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p5pRT commented Nov 4, 2017

From zefram@fysh.org

Created by zefram@fysh.org

If B​::Deparse is given the "-x3" option to expand source constructs,
its expansion of "for" loops loses the initialisation part entirely​:

$ perl -MO=Deparse -e 'for($i = 5; $i != 10; $i++) { print $i, "\n"; }'
for ($i = 5; $i != 10; ++$i) {
  print $i, "\n";
}
-e syntax OK
$ perl -MO=Deparse,-x3 -e 'for($i = 5; $i != 10; $i++) { print $i, "\n"; }'
while ($i != 10) {
  print $i, "\n";
}
continue {
  ++$i
}
-e syntax OK

The documentation for B​::Deparse has a warning about variables declared in
the initialiser getting the wrong scope, but that's not what's happening
here. The declaration doesn't get the wrong scope​: it's omitted entirely,
and (as shown above) the omission happens even without a declaration.

Perl Info 

Flags:
    category=library
    severity=low
    module=B::Deparse

Site configuration information for perl 5.27.5:

Configured by zefram at Fri Oct 20 23:24:00 BST 2017.

Summary of my perl5 (revision 5 version 27 subversion 5) configuration:
   
  Platform:
    osname=linux
    osvers=3.16.0-4-amd64
    archname=x86_64-linux-thread-multi
    uname='linux barba.rous.org 3.16.0-4-amd64 #1 smp debian 3.16.43-2+deb8u2 (2017-06-26) x86_64 gnulinux '
    config_args='-des -Dprefix=/home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52 -Duselargefiles -Dusethreads -Uafs -Ud_csh -Uusesfio -Uusenm -Duseshrplib -Dusedevel -Uversiononly -Ui_db'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=define
    usemultiplicity=define
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
    bincompat5005=undef
  Compiler:
    cc='cc'
    ccflags ='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
    optimize='-O2'
    cppflags='-D_REENTRANT -D_GNU_SOURCE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='4.9.2'
    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-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/4.9/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 -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.19.so
    so=so
    useshrplib=true
    libperl=libperl.so
    gnulibc_version='2.19'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E -Wl,-rpath,/home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/5.27.5/x86_64-linux-thread-multi/CORE'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'



@INC for perl 5.27.5:
    /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/site_perl/5.27.5/x86_64-linux-thread-multi
    /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/site_perl/5.27.5
    /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/5.27.5/x86_64-linux-thread-multi
    /home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/lib/5.27.5


Environment for perl 5.27.5:
    HOME=/home/zefram
    LANG (unset)
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/home/zefram/usr/perl/perl_install/perl-5.27.5-i64-f52/bin:/home/zefram/usr/perl/util:/home/zefram/pub/x86_64-unknown-linux-gnu/bin:/home/zefram/pub/common/bin:/usr/bin:/bin:/usr/local/bin:/usr/games
    PERLDOC=-oman
    PERL_BADLANG (unset)
    SHELL=/usr/bin/zsh

@p5pRT
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p5pRT commented Feb 5, 2019

From wagnerc@plebeian.com

This is still an issue in 5.29.8.

for($i = 5; $i != 10; $i++) { print $i, "\n"; }

deparse​:
while ( ( $i != 10 ) ) { print( $i, "\n" ); } continue { ( ++$i ) }

for(my $i = 5; $i != 10; $i++) { print $i, "\n"; }

deparse​:
while ( ( $i != 10 ) ) { print( $i, "\n" ); } continue { ( ++$i ) }

This problem goes back to atleast 5.8.8.

$ /c/perl588/bin/perl5.8.8.exe -e 'print $]'
5.008008

$ /c/perl588/bin/perl5.8.8.exe -MO=Deparse,-p,-q,-x9,-P -e 'for(my$i = 5; $i != 10; $i++) { print $i, "\n"; }'
-e syntax OK
while (($i != 10)) {
  print($i, "\n");
}
continue {
  (++$i)
}

Thanks.

@p5pRT
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p5pRT commented Feb 5, 2019

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

@xenu xenu removed the affects-5.27 label Nov 19, 2021
@xenu xenu removed the Severity Low label Dec 29, 2021
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