perldelta: warnings on non-chars and surrogates

[perl5.git] / pod / perldelta.pod

=encoding utf8

=head1 NAME

[ this is a template for a new perldelta file. Any text flagged as
XXX needs to be processed before release. ]

perldelta - what is new for perl v5.13.9

=head1 DESCRIPTION

This document describes differences between the 5.13.8 release and
the 5.13.9 release.

If you are upgrading from an earlier release such as 5.13.7, first read
L<perl5138delta>, which describes differences between 5.13.7 and
5.13.8.

=head1 Notice

XXX Any important notices here

=head1 Core Enhancements

XXX New core language features go here. Summarise user-visible core language
enhancements. Particularly prominent performance optimisations could go
here, but most should go in the L</Performance Enhancements> section.

[ List each enhancement as a =head2 entry ]

=head2 New regular expression modifier C</a>

The C</a> regular expression modifier restricts C<\s> to match precisely
the five characters C<[ \f\n\r\t]>, C<\d> to match precisely the 10
characters C<[0-9]>, C<\w> to match precisely the 63 characters
C<[A-Za-z0-9_]>, and the Posix (C<[[:posix:]]>) character classes to
match only the appropriate ASCII characters.  The complements, of
course, match everything but; and C<\b> and C<\B> are correspondingly
affected.  Otherwise, C</a> behaves like the C</u> modifier, in that
case-insensitive matching uses Unicode semantics; for example, "k" will
match the Unicode C<\N{KELVIN SIGN}> under C</i> matching, and code
points in the Latin1 range, above ASCII will have Unicode semantics when
it comes to case-insensitive matching.  Like its cousins (C</u>, C</l>,
and C</d>), and in spite of the terminology, C</a> in 5.14 will not
actually be able to be used as a suffix at the end of a regular
expression (this restriction is planned to be lifted in 5.16).  It must
occur either as an infix modifier, such as C<(?a:...)> or (C<(?a)...>,
or it can be turned on within the lexical scope of C<use re '/a'>.
Turning on C</a> turns off the other "character set" modifiers.

=head2 Any unsigned value can be encoded as a character

With this release, Perl is adopting a model that any unsigned value can
be treated as a code point and encoded internally (as utf8) without
warnings -- not just the code points that are legal in Unicode.
However, unless utf8 warnings have been
explicitly lexically turned off, outputting or performing a
Unicode-defined operation (such as upper-casing) on such a code point
will generate a warning.  Attempting to input these using strict rules
(such as with the C<:encoding('UTF-8')> layer) will continue to fail.
Prior to this release the handling was very inconsistent, and incorrect
in places.  Also, the Unicode non-characters, some of which previously were
erroneously considered illegal in places by Perl, contrary to the Unicode
standard, are now always legal internally.  But inputting or outputting
them will work the same as for the non-legal Unicode code points, as the
Unicode standard says they are illegal for "open interchange".

=head2 Regular expression debugging output improvement

Regular expression debugging output (turned on by C<use re 'debug';>) now
uses hexadecimal when escaping non-ASCII characters, instead of octal.

=head1 Security

XXX Any security-related notices go here.  In particular, any security
vulnerabilities closed should be noted here rather than in the
L</Selected Bug Fixes> section.

[ List each security issue as a =head2 entry ]

=head1 Incompatible Changes

XXX For a release on a stable branch, this section aspires to be:

    There are no changes intentionally incompatible with 5.XXX.XXX. If any
    exist, they are bugs and reports are welcome.

[ List each incompatible change as a =head2 entry ]

=head2 All objects are destroyed

It used to be possible to prevent a destructor from being called during
global destruction by artificially increasing the reference count of an
object.

Now such objects I<will> will be destroyed, as a result of a bug fix
L<[perl #81230]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=81230>.

This has the potential to break some XS modules. (In fact, it break some.
See L</Known Problems>, below.)

=head1 Deprecations

XXX Any deprecated features, syntax, modules etc. should be listed here.
In particular, deprecated modules should be listed here even if they are
listed as an updated module in the L</Modules and Pragmata> section.

[ List each deprecation as a =head2 entry ]

=head1 Performance Enhancements

XXX Changes which enhance performance without changing behaviour go here. There
may well be none in a stable release.

[ List each enhancement as a =item entry ]

=over 4

=item *

XXX

=back

=head1 Modules and Pragmata

XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
go here.  If Module::CoreList is updated, generate an initial draft of the
following sections using F<Porting/corelist-perldelta.pl>, which prints stub
entries to STDOUT.  Results can be pasted in place of the '=head2' entries
below.  A paragraph summary for important changes should then be added by hand.
In an ideal world, dual-life modules would have a F<Changes> file that could be
cribbed.

[ Within each section, list entries as a =item entry ]

=head2 New Modules and Pragmata

=over 4

=item *

L<CPAN::Meta::YAML> 0.003 has been added as a dual-life module.  It supports a
subset of YAML sufficient for reading and writing META.yml and MYMETA.yml files
included with CPAN distributions or generated by the module installation
toolchain. It should not be used for any other general YAML parsing or
generation task.

=item *

L<HTTP::Tiny> 0.009 has been added as a dual-life module.  It is a very
small, simple HTTP/1.1 client designed for simple GET requests and file
mirroring.  It has has been added to enable CPAN.pm and CPANPLUS to
"bootstrap" HTTP access to CPAN using pure Perl without relying on external
binaries like F<curl> or F<wget>.

=item *

L<JSON::PP> 2.27103 has been added as a dual-life module, for the sake of
reading F<META.json> files in CPAN distributions.

=item *

L<Module::Metadata> 1.000003 has been added as a dual-life module.  It gathers
package and POD information from Perl module files.  It is a standalone module
based on Module::Build::ModuleInfo for use by other module installation
toolchain components.  Module::Build::ModuleInfo has been deprecated in
favor of this module instead.

=item *

L<Perl::OSType> 1.002 has been added as a dual-life module.  It maps Perl
operating system names (e.g. 'dragonfly' or 'MSWin32') to more generic types
with standardized names (e.g.  "Unix" or "Windows").  It has been refactored
out of Module::Build and ExtUtils::CBuilder and consolidates such mappings into
a single location for easier maintenance.

=back

=head2 Updated Modules and Pragmata

=over 4

=item *

C<Archive::Extract> has been upgraded from version 0.46 to 0.48

=item *

C<Archive::Tar> has been upgraded from version 1.74 to 1.76

=item *

C<CGI> has been upgraded from version 3.50 to 3.51

Further improvements have been made to guard against newline injections
in headers.

=item *

C<Compress::Raw::Bzip2> has been upgraded from version 2.031 to 2.033

=item *

C<Compress::Raw::Zlib> has been upgraded from version 2.030 to 2.033

=item *

C<CPAN> has been upgraded from version 1.94_62 to 1.94_63

=item *

C<CPANPLUS> has been upgraded from version 0.9010 to 0.9011

=item *

C<CPANPLUS::Dist::Build> has been upgraded from version 0.50 to 0.52

=item *

C<DB_File> has been upgraded from version 1.820 to 1.821

=item *

C<Encode> has been upgraded from version 2.40 to 2.42.
Now, all 66 Unicode non-characters are treated the same way U+FFFF has
always been treated; if it was disallowed, all 66 are disallowed; if it
warned, all 66 warn.

=item *

C<File::Fetch> has been upgraded from version 0.28 to 0.32

=item *

C<IO::Compress> has been upgraded from version 2.030 to 2.033

=item *

C<IPC::Cmd> has been upgraded from version 0.66 to 0.68

=item *

C<Log::Message> has been upgraded from version 0.02 to 0.04

=item *

C<Log::Message::Simple> has been upgraded from version 0.06 to 0.08

=item *

C<Module::Load::Conditional> has been upgraded from version 0.38 to 0.40

=item *

C<Object::Accessor> has been upgraded from version 0.36 to 0.38

=item *

C<Params::Check> has been upgraded from version 0.26 to 0.28

=item *

C<Pod::LaTeX> has been upgraded from version 0.58 to 0.59

=item *

C<Term::UI> has been upgraded from version 0.20 to 0.24

=item *

C<Thread::Queue> has been upgraded from version 2.11 to 2.12.

=item *

C<Thread::Semaphore> has been upgraded from version 2.11 to 2.12.

=item *

C<threads> has been upgraded from version 1.81_03 to 1.82

=item *

C<threads::shared> has been upgraded from version 1.35 to 1.36

=item *

C<Time::Local> has been upgraded from version 1.1901_01 to 1.2000.

=item *

C<Unicode::Normalize> has been upgraded from version 1.07 to 1.10

=item *

C<version> has been upgraded from 0.86 to 0.88.

=back

=head2 Removed Modules and Pragmata

=over 4

=item *

XXX

=back

=head1 Documentation

XXX Changes to files in F<pod/> go here.  Consider grouping entries by
file and be sure to link to the appropriate page, e.g. L<perlfunc>.

=head2 New Documentation

XXX Changes which create B<new> files in F<pod/> go here.

=head3 L<XXX>

XXX Description of the purpose of the new file here

=head2 Changes to Existing Documentation

XXX Changes which significantly change existing files in F<pod/> go here.
However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
section.

=head3 L<perlfunc>

=over 4

=item *

It has now been documented that C<ord> returns 0 for an empty string.

=back

=head1 Diagnostics

The following additions or changes have been made to diagnostic output,
including warnings and fatal error messages.  For the complete list of
diagnostic messages, see L<perldiag>.

XXX New or changed warnings emitted by the core's C<C> code go here. Also
include any changes in L<perldiag> that reconcile it to the C<C> code.

[ Within each section, list entries as a =item entry ]

=head2 New Diagnostics

XXX Newly added diagnostic messages go here

=over 4

=item *

Performing an operation requiring Unicode semantics (such as case-folding)
on a Unicode surrogate or a non-Unicode character now triggers a warning:
'Operation "%s" returns its argument for ...'.

=back

=head2 Changes to Existing Diagnostics

XXX Changes (i.e. rewording) of diagnostic messages go here

=over 4

=item *

XXX

=back

=head1 Utility Changes

XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go
here. Most of these are built within the directories F<utils> and F<x2p>.

[ List utility changes as a =head3 entry for each utility and =item
entries for each change
Use L<XXX> with program names to get proper documentation linking. ]

=head3 L<perlbug>

=over 4

=item *

C<perlbug> did not previously generate a From: header, potentially
resulting in dropped mail. Now it does include that header.

=back

=head1 Configuration and Compilation

XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
go here.  Any other changes to the Perl build process should be listed here.
However, any platform-specific changes should be listed in the
L</Platform Support> section, instead.

[ List changes as a =item entry ].

=over 4

=item *

XXX

=back

=head1 Testing

XXX Any significant changes to the testing of a freshly built perl should be
listed here.  Changes which create B<new> files in F<t/> go here as do any
large changes to the testing harness (e.g. when parallel testing was added).
Changes to existing files in F<t/> aren't worth summarising, although the bugs
that they represent may be covered elsewhere.

[ List each test improvement as a =item entry ]

=over 4

=item *

A new test script, C<t/porting/filenames.t>, makes sure that filenames and
paths are reasonably portable.

=back

=head1 Platform Support

XXX Any changes to platform support should be listed in the sections below.

[ Within the sections, list each platform as a =item entry with specific
changes as paragraphs below it. ]

=head2 New Platforms

XXX List any platforms that this version of perl compiles on, that previous
versions did not. These will either be enabled by new files in the F<hints/>
directories, or new subdirectories and F<README> files at the top level of the
source tree.

=over 4

=item XXX-some-platform

XXX

=back

=head2 Discontinued Platforms

XXX List any platforms that this version of perl no longer compiles on.

=over 4

=item Apollo DomainOS

The last vestiges of support for this platform have been excised from the
Perl distribution. It was officially discontinued in version 5.12.0. It had
not worked for years before that.

=back

=head2 Platform-Specific Notes

XXX List any changes for specific platforms. This could include configuration
and compilation changes or changes in portability/compatibility.  However,
changes within modules for platforms should generally be listed in the
L</Modules and Pragmata> section.

=over 4

=item Solaris

DTrace is now supported on Solaris. There used to be build failures, but
these have been fixed
L<[perl #73630]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=73630>.

=back

=head1 Internal Changes

XXX Changes which affect the interface available to C<XS> code go here.
Other significant internal changes for future core maintainers should
be noted as well.

[ List each test improvement as a =item entry ]

=over 4

=item *

The opcode bodies for C<chop> and C<chomp> and for C<schop> and C<schomp> have
been merged. The implementation functions C<Perl_do_chop()> and
C<Perl_do_chomp()>, never part of the public API, have been merged and moved to
a static function in F<pp.c>. This shrinks the perl binary slightly, and should
not affect any code outside the core (unless it is relying on the order of side
effects when C<chomp> is passed a I<list> of values).

=item *

Some of the flags parameters to the uvuni_to_utf8_flags() and
utf8n_to_uvuni() have changed.  This is a result of Perl now allowing
internal storage and manipulation of code points that are problematic
in some situations.  Hence, the default actions for these functions has
been complemented to allow these code points.  The new flags are
documented in L<perlapi>.  Code that requires the problematic code
points to be rejected needs to change to use these flags.  Some flag
names are retained for backward source compatibility, though they do
nothing, as they are now the default.  However the flags
C<UNICODE_ALLOW_FDD0>, C<UNICODE_ALLOW_FFFF>, C<UNICODE_ILLEGAL>, and
C<UNICODE_IS_ILLEGAL> have been removed, as they stem from a
fundamentally broken model of how the Unicode non-character code points
should be handled, which is now described in
L<perlunicode/Non-character code points>.  See also L</Selected Bug Fixes>.

=item *

Certain shared flags in the C<pmop.op_pmflags> and C<regexp.extflags>
structures have been removed.  These are: C<Rxf_Pmf_LOCALE>,
C<Rxf_Pmf_UNICODE>, and C<PMf_LOCALE>.  Instead there are encodes and
three static in-line functions for accessing the information:
C<get_regex_charset()>, C<set_regex_charset()>, and C<get_regex_charset_name()>,
which are defined in the places where the orginal flags were.

=item *

A new option has been added to C<pv_escape> to dump all characters above
ASCII in hexadecimal. Before, one could get all characters as hexadecimal
or the Latin1 non-ASCII as octal

=back

=head1 Selected Bug Fixes

XXX Important bug fixes in the core language are summarised here.
Bug fixes in files in F<ext/> and F<lib/> are best summarised in
L</Modules and Pragmata>.

[ List each fix as a =item entry ]

=over 4

=item *

The handling of Unicode non-characters has changed.
Previously they were mostly considered illegal, except that only one of
the 66 of them was known about in places.  The Unicode standard
considers them legal, but forbids the "open interchange" of them.
This is part of the change to allow the internal use of any code point
(see L</Core Enhancements>).  Together, these changes resolve
L<# 38722|https://rt.perl.org/rt3/Ticket/Display.html?id=38722>,
L<# 51918|http://rt.perl.org/rt3/Ticket/Display.html?id=51918>,
L<# 51936|http://rt.perl.org/rt3/Ticket/Display.html?id=51936>,
L<# 63446|http://rt.perl.org/rt3/Ticket/Display.html?id=63446>

=item *

Sometimes magic (ties, tainted, etc.) attached to variables could cause an
object to last longer than it should, or cause a crash if a tied variable
were freed from within a tie method. These have been fixed
L<[perl #81230]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=81230>.

=item *

Most I/O functions were not warning for unopened handles unless the
'closed' and 'unopened' warnings categories were both enabled. Now only
C<use warnings 'unopened'> is necessary to trigger these warnings (as was
always meant to be the case.

=item *

C<< <expr> >> always respects overloading now if the expression is
overloaded.

Due to the way that '<> as glob' was parsed differently from
'<> as filehandle' from 5.6 onwards, something like C<< <$foo[0]> >> did
not handle overloading, even if C<$foo[0]> was an overloaded object. This
was contrary to the documentation for overload, and meant that C<< <> >>
could not be used as a general overloaded iterator operator.

=item *

Destructors on objects were not called during global destruction on objects
that were not referenced by any scalars. This could happen if an array
element were blessed (e.g., C<bless \$a[0]>) or if a closure referenced a
blessed variable (C<bless \my @a; sub foo { @a }>).

Now there is an extra pass during global destruction to fire destructors on
any objects that might be left after the usual passes that check for
objects referenced by scalars
L<[perl #36347]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=36347>.

=back

=head1 Known Problems

XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
tests that had to be C<TODO>ed for the release would be noted here, unless
they were specific to a particular platform (see below).

This is a list of some significant unfixed bugs, which are regressions
from either 5.XXX.XXX or 5.XXX.XXX.

[ List each fix as a =item entry ]

=over 4

=item *

The fix for [perl #81230] causes test failures for C<Tk> version 804.029.
This is still being investigated.

=back

=head1 Obituary

XXX If any significant core contributor has died, we've added a short obituary
here.

=head1 Acknowledgements

XXX The list of people to thank goes here.

=head1 Reporting Bugs

If you find what you think is a bug, you might check the articles
recently posted to the comp.lang.perl.misc newsgroup and the perl
bug database at http://rt.perl.org/perlbug/ .  There may also be
information at http://www.perl.org/ , the Perl Home Page.

If you believe you have an unreported bug, please run the L<perlbug>
program included with your release.  Be sure to trim your bug down
to a tiny but sufficient test case.  Your bug report, along with the
output of C<perl -V>, will be sent off to perlbug@perl.org to be
analysed by the Perl porting team.

If the bug you are reporting has security implications, which make it
inappropriate to send to a publicly archived mailing list, then please send
it to perl5-security-report@perl.org. This points to a closed subscription
unarchived mailing list, which includes all the core committers, who be able
to help assess the impact of issues, figure out a resolution, and help
co-ordinate the release of patches to mitigate or fix the problem across all
platforms on which Perl is supported. Please only use this address for
security issues in the Perl core, not for modules independently
distributed on CPAN.

=head1 SEE ALSO

The F<Changes> file for an explanation of how to view exhaustive details
on what changed.

The F<INSTALL> file for how to build Perl.

The F<README> file for general stuff.

The F<Artistic> and F<Copying> files for copyright information.

=cut

=for later

Below, you'll find a cut-down version of the git log from 5.13.8 to 1b9043bb.
Jesse went through and took a first pass at cutting out non-changelog items. He may have been over-(or under-)zealous.

It hasn't yet been deduped with the entries that _are_ in the perldelta.


    Major spell-checking pass throughout the core

    Remove references to compat3.sym and interp.sym, deleted over 10 years ago.

    Remove Mac OS classic code from numerous places throughout the core

commit 7fe50b8b8a4dc38fc341e3b403545aaca937f50e
Author: Leon Timmermans <fawaka@gmail.com>
Date:   Tue Jan 18 16:40:07 2011 +0100

    Also unblock signal handlers throwing an exception

    Also handle and test the edge case of a signal handler throwing an
    exception




Numberous POD warnings fixed



    Update Unicode-Collate to CPAN version 0.71


internals


    regexec.c: Remove break statements from macros

    This is so future coders won't be tempted to rely on them.

    regexec.c: Don't rely on break stmts in macros

    It is safer and clearer to have the break statement in each case statement at
    the source level

commit b57e41186b2ceb48bef4f0588dcd19e105cc8a38
Author: Karl Williamson <public@khwilliamson.com>
Date:   Tue Jan 18 15:03:41 2011 -0700

    regcomp: Disallow multi-char folds in lookbehind

    The addition of the ANYOFV regnode to treat multi-char folds in a bracketed
    character class has exposed a bug, in which those classes have long been able
    to be varying length (due to the multi-char fold), but the compiler wasn't
    aware of it.  Now it is, and hence won't allow those which have multi-char
    folds to be part of a lookbehind pattern, which requires a constant length.

    This patch disallows multi-char folds in a lookbehind bracketed character
    class.

Author: Nicholas Clark <nick@ccl4.org>
Date:   Tue Jan 18 16:14:43 2011 +0000

    Remove Mac OS classic code from scripts in utils/


    Convert DosGlob.t to Test::More.

commit d6dc8a6dc95226ddff7719cd1e0bd053c4e5725e
Author: Nicholas Clark <nick@ccl4.org>
Date:   Tue Jan 18 13:08:11 2011 +0000

    Remove Mac OS Classic docs from DirHandle and File::{Copy,DosGlob,Find}

    The documentation for the different behaviour on Mac OS Classic was not
    removed when the relevant code was removed in 862f843bac3434c2. That commit
    also remove all callers to several Mac OS classic support functions, but not
    the functions themselves. Rectify this.

commit 8254cbf193c939338449097a80163197fc755150
Author: Nicholas Clark <nick@ccl4.org>
Date:   Tue Jan 18 11:10:41 2011 +0000

    Build perltoc.pod with pragmata sorted by name.

    Previously they were actually sorted by full pathname, which isn't logical.
    I presume that this is an artefact of all pragmata being in lib/ when
    pod/buildtoc was originally written.

commit 1d45ec279e4e105512a2803e3d0bd974a151a0f6
Author: Father Chrysostomos <sprout@cpan.org>
Date:   Mon Jan 17 22:32:52 2011 -0800

    perlcall: Fixes for various grammatical errors

commit faaf68361923e4bb95d1eb919bc724a0dcc5a4ce
Author: Leon Timmermans <fawaka@gmail.com>
Date:   Mon Jan 17 17:59:33 2011 +0100

    Clarify limitation in safe signals.

commit 0c1bf4c7d433bb0ad80bfe5511b1301db32b7b95
Author: Leon Timmermans <fawaka@gmail.com>
Date:   Mon Jan 17 16:29:11 2011 +0100

    Added tests for conditional unblocking

commit 555344425f04e96a72e4d29eab96b34bff8f96ae
Author: Leon Timmermans <fawaka@gmail.com>
Date:   Thu Jan 13 18:30:29 2011 +0100

    Conditionally unblock after signal handler[#82040]

    Only unblock signal after a safe-signal handler is executed if that signal was
    also unblocked before the handler.
commit 435aa301127ed481169903cb35187bde1ea44928
Author: David Golden <dagolden@cpan.org>
Date:   Mon Jan 17 20:39:14 2011 -0500

    Update HTTP::Tiny to CPAN version 0.009

commit 78cd53afbb1923bf0a68f361040ad8fe93a7d0d5
Author: David Mitchell <davem@iabyn.com>
Date:   Tue Jan 18 00:46:30 2011 +0000

    vastly speed up t/porting/diag.t

    This used to take about 3 minutes of CPU. Reduce this to around
    6 seconds (!!) by coalescing and pre-compiling various patterns
    that get applied to nearly every line of every source file.

commit cfaf538b6276c6a8ef80ff6c66e106c6a4f1caaa
Author: Karl Williamson <public@khwilliamson.com>
Date:   Mon Jan 17 08:58:53 2011 -0700

    Add /a regex modifier

    This restricts certain constructs, like \w, to matching in the ASCII range only.

commit 56ae17b45d2513d65903d13468e8f6a16b20f916
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sun Jan 16 17:41:30 2011 -0700

    regcomp.c: Convert \d \D to a switch{}

commit e66820012d29519f903709f005e56a2c334ae183
Author: Tony Cook <tony@develop-help.com>
Date:   Mon Jan 17 19:22:08 2011 +1100

    test_prep now depends on the pods needed for porting/buildtoc.t

    In the other makefiles test_prep (or test-prep) depends on all, so
    they shouldn't need updating.


commit a52237f3a547cdefddd4c4be6224bfdf67c84263
Author: David Golden <dagolden@cpan.org>
Date:   Sun Jan 16 21:32:21 2011 -0500

    Update CPAN to CPAN version 1.94_63

commit 63ac0dadb1aafcf0c171d3c1422c1923b611b2fc
Author: Karl Williamson <public@khwilliamson.com>
Date:   Tue Dec 28 16:13:49 2010 -0700

    regex: Use BOUNDU regnodes

    This refactors one area in regexec.c to use BOUNDU, NBOUNDU for
    efficiciency, and easier adding of the future BOUNDA.

commit 980866de2cf8ecdb4bb72b7f9294763057008f50
Author: Karl Williamson <public@khwilliamson.com>
Date:   Mon Dec 27 12:04:58 2010 -0700

    regex: Separate nodes for Unicode semantics \s \w

    This patch converts the \s, \w and complements Unicode semantics to
    instead of using the flags field of their nodes to instead use separate
    nodes.  This gains some efficiency, especially useful in tight loops and
    backtracking of regexec.c, and prepares the way for easily adding other
    semantic variations, such as /a.

    It refactors the CCC_TRY... macros.  I tried to break this piece up into
    smaller chunks, but found it much easier to get to this in one step.
    Further patches will do some more refactoring of these.

    As part of the CCC_TRY macro refactoring, the lines that include the
    test if (! nextchr) are changed to just look for the end-of-string by
    position instead of it being NUL.  In locales, it could be (however
    unlikely), that NUL is a real alphabetic, digit, or space character.
commit 50e911483ad5c29e25c54c9f81f92df974dd2cc0
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sun Dec 26 10:35:58 2010 -0700

    Change name of /d to DEPENDS

    I much prefer David Golden's name for /d whose meaning 'depends' on
    circumstances, instead of 'dual' meaning it could be one or another.
    Change it before this gets out in a stable release, and we're stuck with
    the old name.

commit 73134a2eb4055c76fe5b154da95e09118f716fd8
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sun Dec 26 10:35:20 2010 -0700

    CH] Change usage of regex/op common to common names

    This patch changes the core functions to use the common names for the
    fields that are shared between op.c and regcomp.c, just for consistency
    of using one name throughout the core for the same thing.

    A grep of cpan shows that both names are used in various modules; so
    both names must be retained.

commit a3ab329f3fc9494e700f51c38cef42021c130b6e
Author: David Golden <dagolden@cpan.org>
Date:   Sun Jan 16 20:57:02 2011 -0500

    Add HTTP::Tiny as a dual-life core module

    HTTP::Tiny has been added as a dual-life module.  It is a very
    small, simple HTTP/1.1 client designed for simple GET requests and file
    mirroring.  It has has been added to enable CPAN.pm and CPANPLUS to
    "bootstrap" HTTP access to CPAN using pure Perl without relying on external
    binaries like F<curl> or F<wget>.

commit 211cc5012284f4bd900fcaa630adbcac69ca6112
Author: Chris 'BinGOs' Williams <chris@bingosnet.co.uk>
Date:   Sun Jan 16 23:23:03 2011 +0000

    Update Unicode-Collate to CPAN version 0.70 and enable XS version

commit a62b1201c068dc7b099bcb7182e188c4d2fbf34c
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sun Dec 26 10:31:16 2010 -0700

    Use multi-bit field for regex character set

    The /d, /l, and /u regex modifiers are mutually exclusive.  This patch
    changes the field that stores the character set to use more than one bit
    with an enum determining which one.  This data structure more
    closely follows the semantics of their being mutually exclusive, and
    conserves bits as well, and is better expandable.

    A small API is added to set and query the bit field.

    This patch is not .xs source backwards compatible.  A handful of cpan
    programs are affected.


tools

    Significant updates to buildtoc

    Update Unicode-Normalize to CPAN version 1.10

commit 11454c594f22abc5945e69a46fc965363dbf326e
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sat Jan 15 13:42:58 2011 -0700

    Fix \xa0 matching both [\s] [\S], et.al.

    This bug stemmed from Latin1 characters not matching any (non-complemented)
    character class in /d semantics when the target string is no utf8; but having
    unicode semantics when it isn't.  The solution here is to add a special flag.

    There were several tests that relied on the broken behavior, specifically they
    tested that \xff isn't a printable word character even in utf8.  I changed the
    deparse test to instead use a non-printable code point, and I changed the ones
    in re_tests to be TODOs, and will change them back using /a when that is
    shortly added.


SECURITY

    restrict \p{IsUserDefined} to In\w+ and In\w+

    In L<perlunicode/"User-Defined Character Properties">, it says you can
    create custom properties by defining subroutines whose names begin with
    "In" or "Is". However, perl doesn't actually enforce that naming
    restriction, so \p{foo::bar} will call foo::Bar() if it exists.

    This commit finally enforces this convention. Note that this broke a
    number of existing tests for properties, since they didn't always use an
    Is/In prefix.

TESTING

    test that perl.pod, pod.lst, MANIFEST and the file system are consistent

commit f56b6394f7cf57733135f56e4e4ac49abe9ac9cc
Author: Karl Williamson <public@khwilliamson.com>
Date:   Thu Jan 13 22:36:36 2011 -0700

    regex: Use ANYOFV

    This patch restructures the regex ANYOF code to generate ANYOFV nodes instead
    when there is a possibility that it could match more than one character.   Note
    that this doesn't affect the optimizer, as it essentially ignores things that
    fit into this category.  (But it means that the optimizer will no longer reject
    these when it shouldn't have.)

    The handling of the LATIN SHARP s is modified to correspond with this new node
    type.

    The initial handling of ANYOFV is placed in regexec.c.  More analysis will come
    on that.  But there was significant change to the part that handles matching
    multi-char strings.  This has long been buggy, with it previously comparing a
    folded-version on one side with a non-folded version on the other.

    This patch fixes about 60% of the problems that my undelivered test suite gives
    for multi-char folds.  But there are still 17K test failures left, so I'm still
    not delivering that.  The TODOs that this fixes will be cleaned up in a later commit


    Update Pod-LaTeX to CPAN version 0.59

commit 680818c0361b180bb6f09d4bb11c4d5cd467fe62
Author: Nicholas Clark <nick@ccl4.org>
Date:   Thu Jan 13 16:24:52 2011 +0000

    ithread_create() was relying on the stack not moving. Fix this.

    4cf5eae5e58faebb changed S_ithread_create() to avoid creating an AV, by
    passing the thread creation arguments as pointers to a block of memory
    holding SVs. Unfortunately, this inadvertently introduced a subtle bug,
    because the block of memory is on the Perl stack, which can move as a side
    effect of being reallocated to extend it. Hence pass in the offset on the
    stack instead, read the current value of the relevant interpreter's stack
    at the point of access, and copy all the SVs away before making any further
    calls which might cause reallocation.

    Update to Win32-0.44 from CPAN
    Update IO-Compress to CPAN version 2.033
    Update Compress-Raw-Zlib to CPAN version 2.033
    Update Compress-Raw-Bzip2 to CPAN version 2.033
    Update DB_File to CPAN version 1.821

DIAGNOSTICS
    Correct the "unimplemented" message for get{host,net,proto,serv}ent aliases.

    Previously, if all of gethost{byaddr,byname,ent} were unimplemented on a
    platform, they would all return 'Unsupported socket function "gethostent"
    called', with the analogous results for getnet{byaddr,byname,ent},
    getproto{byname,bynumber,ent} and getserv{byname,byport,ent}. This bug was
    introduced by change af51a00e97d5c559 - prior to this, all 12 functions would
    report their own name when unimplemented.


commit 7627e6d0fe772ac90fce9e03fea273109521e261
Author: Nicholas Clark <nick@ccl4.org>
Date:   Sat Jan 8 15:56:22 2011 +0000

    Generate "Unsupported socket function" stubs using PL_ppaddr.

    Instead of having each socket op conditionally compile as either the
    implementation or a DIE() depending on #HAS_SOCKET

    1: remove the conditional code from the ops themselves
    2: only compile the ops if HAS_SOCKET is defined
    3: general conditional code for the intialisation of PL_ppaddr - as appropriate
       either the ops, or Perl_unimplemented_op
    4: Amend Perl_unimplemented_op to generate the appropriate DIE() for socket
       ops (ie not the "panic"... message)

    Whilst this complicates the support code in regen/opcode.pl, it's already a
    net saving of 5 lines in the C code.

commit 897d398936dd2fc088a265fba2a7b62fa97ed458
Author: Nicholas Clark <nick@ccl4.org>
Date:   Sun Jan 9 10:54:58 2011 +0000

    Generate pp_* prototypes in pp_proto.h, and remove pp.sym

    Eliminate the #define pp_foo Perl_pp_foo(pTHX) macros, and update the 13
    locations that relied on them.

    regen/opcode.pl now generates prototypes for the PP functions directly, into
    pp_proto.h. It no longer writes pp.sym, and regen/embed.pl no longer reads
    this, removing the only ordering dependency in the regen scripts. opcode.pl
    is now responsible for prototypes for pp_* functions. (embed.pl remains
    responsible for ck_* functions, reading from regen/opcodes)

commit a4a4c9e2c086dd5f7b7b05789161614dbbe8385b
Author: Karl Williamson <public@khwilliamson.com>
Date:   Sat Jan 8 14:44:05 2011 -0700

    perldiag.pod: Add missing message severities


TESTING
    add test for split without a pattern

    Add some while tests, about the context of the last statement in a block and about reinitializaiton of lexical variables.

    modernise t/cmd/while.t

    Add t/base/while.t testing the basic of a while loop with minimal dependencies.  Change t/cmd/while.t into a non-base test using "test.pl".

commit b86b68b4eefa1069dabc8ea0401d712b24a67857
Author: Jesse Vincent <jesse@bestpractical.com>
Date:   Sat Jan 8 00:14:29 2011 +0800

    Update the policy on doc patches to maint


commit 0b5e625bc99f5cb78697faf03b297b6cacadf60b
Author: Reini Urban <rurban@x-ray.at>
Date:   Tue Sep 14 18:04:22 2010 +0200

    build man pages on cygwin too

commit 172830635ea7813c85e51e4ae2b4bed56ddbab83
Author: Reini Urban <rurban@x-ray.at>
Date:   Tue Sep 14 17:54:15 2010 +0200

    Improve cygwin rebase behaviour

    If a dll is updated on cygwin reuse the old imagebase address.
    This solves most rebase errors, esp when updating on core dll's.
    See http://www.tishler.net/jason/software/rebase/rebase-2.4.2.README


Platforms

commit cc7e77fd5a0ee9f1498e54dddf566117da62754b
Author: Reini Urban <rurban@x-ray.at>
Date:   Tue Sep 14 17:48:32 2010 +0200

    CYG14 Dynaloader without USEIMPORTLIB, and search cyg prefix

    part1: Support the standard cyg dll prefix, which is e.g. needed for FFI's.
    Ctypes and C::DynaLib use DynaLoader to find dlls.

    part2: With -DUSEIMPORTLIB DynaLoader symbols link against the prefixed
    symbol names for the .dll.a importlib, but we need to link against the
    symbols directly. We don't link Dynaloader against libperl.dll.a.

    Otherwise:
    $ g++-4 -o cygperl5_13_4.dll --shared perlsrc.o cygwin.o  DynaLoader.o -ldl -lcrypt
      Creating library file: libperl.dll.a
      DynaLoader.o: In function `XS_DynaLoader_dl_undef_symbols':
      ext/DynaLoader/DynaLoader.c:346: undefined reference to `__imp__PL_stack_sp'
      ext/DynaLoader/DynaLoader.c:346: undefined reference to `__imp__PL_markstack_ptr'
      ext/DynaLoader/DynaLoader.c:346: undefined reference to `__imp__PL_stack_base'

commit c0a149a90b8b6e1c18de7294ca974265fb559cf5
Author: Reini Urban <rurban@x-ray.at>
Date:   Tue Sep 14 18:06:38 2010 +0200

    Update cygwin hints
    do not use usemymalloc (double size + slow)
    remove deprecated libcygipc info
    remove overlarge stack size

commit 2831a86cee065b53b74fd19ddcc6a4257484646d
Author: Zsbán Ambrus <ambrus@math.bme.hu>
Date:   Sun Jan 2 20:25:55 2011 -0800

    [perl #81032] Overhaul Porting/epigraphs.pod

    This patch makes multiple changes to Porting/epigraphs.pod and
    pod/perlhist.pod.

    For those that don't know, Porting/epigraphs.pod is a new document that
    collects the quotes (chosen by Pumpkins) in perl release announcements.

    The changes are the following.

    1. Add a link pointing to each release announcement in the mailing
    list archives.  These are from ysth's list, the source from which
    Porting/epigraphs.pod was originally compiled, but they weren't in
    Porting/epigraphs.pod so far.
    2. Reorder Porting/epigraphs.pod chronologically, because I believe
    that makes more sense -- pod/perlhist.pod is still sorted by version numbers.
    3. Incidentally, some missing releases are added to pod/perlhist.pod too.
    4. Fix a mistake where Porting/epigraphs.pod gives the wrong version number.
    5. Add some epigraphs that appear in ysth's list but not in
    Porting/epigraphs.pod.
    6. I did some research in perl history before the part that ysth's list
    covers, and added older perl announcements I found.  This work is not
    complete: I stopped somewhere in 2000.

commit eccda089fc3dcaafc1ae0aac6b428f799231b824
Author: Paul "LeoNerd" Evans <leonerd@leonerd.org.uk>
Date:   Mon Dec 13 17:50:06 2010 +0000

    Implement Socket::getaddrinfo() and Socket::getnameinfo(), with related constants

commit edcf105d70e5423fd928c776e086fe31a4a543f4
Author: Jesse Vincent <jesse@bestpractical.com>
Date:   Sat Jan 1 18:46:20 2011 +0800

    Document 'test_porting' and start a section on how committing to blead

commit cce04bebd8af026c2a6731940ddb895d3c1fc3e4
Author: David Golden <dagolden@cpan.org>
Date:   Mon Dec 13 17:36:33 2010 -0500

    Reorganize perlhack.pod

    Following on an IRC conversation, I've attempted to reorganize
    perlhack for greater clarity.  I have only cut and paste blocks
    of text and amended section titles and levels.  (I have not addressed
    any of the numerous factual issues which remain.)

    The resulting guide should be clearer for those trying to skim the
    table of contents to understand what is covered in perlhack and
    whether it is worth an in-depth read.

    I see this change as the first step towards future improvements.

=cut