3 perl5110delta - what is new for perl v5.11.0
7 This document describes differences between the 5.10.0 release and
8 the 5.11.0 development release.
10 =head1 Incompatible Changes
12 =head2 In @INC, move ARCHLIB and PRIVLIB after the current version's site_perl and vendor_perl.
15 =head2 Switch statement changes
17 The handling of complex expressions by the C<given>/C<when> switch
18 statement has been enhanced. These enhancements are also available in
19 5.10.1 and subsequent 5.10 releases. There are two new cases where C<when> now
20 interprets its argument as a boolean, instead of an expression to be used
25 =item flip-flop operators
27 The C<..> and C<...> flip-flop operators are now evaluated in boolean
28 context, following their usual semantics; see L<perlop/"Range Operators">.
30 Note that, as in perl 5.10.0, C<when (1..10)> will not work to test
31 whether a given value is an integer between 1 and 10; you should use
32 C<when ([1..10])> instead (note the array reference).
34 However, contrary to 5.10.0, evaluating the flip-flop operators in boolean
35 context ensures it can now be useful in a C<when()>, notably for
36 implementing bistable conditions, like in:
38 when (/^=begin/ .. /^=end/) {
42 =item defined-or operator
44 A compound expression involving the defined-or operator, as in
45 C<when (expr1 // expr2)>, will be treated as boolean if the first
46 expression is boolean. (This just extends the existing rule that applies
47 to the regular or operator, as in C<when (expr1 || expr2)>.)
51 The next section details more changes brought to the semantics to
52 the smart match operator, that naturally also modify the behaviour
53 of the switch statements where smart matching is implicitly used.
54 These changers were also made for the 5.10.1 release, and will remain in
55 subsequent 5.10 releases.
57 =head2 Smart match changes
59 =head3 Changes to type-based dispatch
61 The smart match operator C<~~> is no longer commutative. The behaviour of
62 a smart match now depends primarily on the type of its right hand
63 argument. Moreover, its semantics have been adjusted for greater
64 consistency or usefulness in several cases. While the general backwards
65 compatibility is maintained, several changes must be noted:
71 Code references with an empty prototype are no longer treated specially.
72 They are passed an argument like the other code references (even if they
77 C<%hash ~~ sub {}> and C<@array ~~ sub {}> now test that the subroutine
78 returns a true value for each key of the hash (or element of the
79 array), instead of passing the whole hash or array as a reference to
84 Due to the commutativity breakage, code references are no longer
85 treated specially when appearing on the left of the C<~~> operator,
86 but like any vulgar scalar.
90 C<undef ~~ %hash> is always false (since C<undef> can't be a key in a
91 hash). No implicit conversion to C<""> is done (as was the case in perl
96 C<$scalar ~~ @array> now always distributes the smart match across the
97 elements of the array. It's true if one element in @array verifies
98 C<$scalar ~~ $element>. This is a generalization of the old behaviour
99 that tested whether the array contained the scalar.
103 The full dispatch table for the smart match operator is given in
104 L<perlsyn/"Smart matching in detail">.
106 =head3 Smart match and overloading
108 According to the rule of dispatch based on the rightmost argument type,
109 when an object overloading C<~~> appears on the right side of the
110 operator, the overload routine will always be called (with a 3rd argument
111 set to a true value, see L<overload>.) However, when the object will
112 appear on the left, the overload routine will be called only when the
113 rightmost argument is a simple scalar. This way distributivity of smart match
114 across arrays is not broken, as well as the other behaviours with complex
115 types (coderefs, hashes, regexes). Thus, writers of overloading routines
116 for smart match mostly need to worry only with comparing against a scalar,
117 and possibly with stringification overloading; the other common cases
118 will be automatically handled consistently.
120 C<~~> will now refuse to work on objects that do not overload it (in order
121 to avoid relying on the object's underlying structure). (However, if the
122 object overloads the stringification or the numification operators, and
123 if overload fallback is active, it will be used instead, as usual.)
125 =head2 Labels can't be keywords
127 Labels used as targets for the C<goto>, C<last>, C<next> or C<redo>
128 statements cannot be keywords anymore. This restriction will prevent
129 potential confusion between the C<goto LABEL> and C<goto EXPR> syntaxes:
130 for example, a statement like C<goto print> would jump to a label whose
131 name would be the return value of print(), (usually 1), instead of a
132 label named C<print>. Moreover, the other control flow statements
133 would just ignore any keyword passed to them as a label name. Since
134 such labels cannot be defined anymore, this kind of error will be
137 =head2 Other incompatible changes
143 The semantics of C<use feature :5.10*> have changed slightly.
144 See L<"Modules and Pragmata"> for more information.
148 It is now a run-time error to use the smart match operator C<~~>
149 with an object that has no overload defined for it. (This way
150 C<~~> will not break encapsulation by matching against the
151 object's internal representation as a reference.)
155 The version control system used for the development of the perl
156 interpreter has been switched from Perforce to git. This is mainly an
157 internal issue that only affects people actively working on the perl core;
158 but it may have minor external visibility, for example in some of details
159 of the output of C<perl -V>. See L<perlrepository> for more information.
163 The internal structure of the C<ext/> directory in the perl source has
164 been reorganised. In general, a module C<Foo::Bar> whose source was
165 stored under F<ext/Foo/Bar/> is now located under F<ext/Foo-Bar/>. Also,
166 some modules have been moved from F<lib/> to F<ext/>. This is purely a
167 source tarball change, and should make no difference to the compilation or
168 installation of perl, unless you have a very customised build process that
169 explicitly relies on this structure, or which hard-codes the C<nonxs_ext>
170 F<Configure> parameter. Specifically, this change does not by default
171 alter the location of any files in the final installation.
175 As part of the C<Test::Harness> 2.x to 3.x upgrade, the experimental
176 C<Test::Harness::Straps> module has been removed.
177 See L</"Updated Modules"> for more details.
181 As part of the C<ExtUtils::MakeMaker> upgrade, the
182 C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish> modules
183 have been removed from this distribution.
187 C<Module::CoreList> no longer contains the C<%:patchlevel> hash.
191 This one is actually a change introduced in 5.10.0, but it was missed
192 from that release's perldelta, so it is mentioned here instead.
194 A bugfix related to the handling of the C</m> modifier and C<qr> resulted
195 in a change of behaviour between 5.8.x and 5.10.0:
197 # matches in 5.8.x, doesn't match in 5.10.0
198 $re = qr/^bar/; "foo\nbar" =~ /$re/m;
202 C<length undef> now returns undef.
206 =head1 Core Enhancements
208 =head2 Unicode Character Database 5.1.0
210 The copy of the Unicode Character Database included in Perl 5.11.0 has
211 been updated to 5.1.0 from 5.0.0. See
212 L<http://www.unicode.org/versions/Unicode5.1.0/#Notable_Changes> for the
215 =head2 A proper interface for pluggable Method Resolution Orders
217 As of Perl 5.11.0 there is a new interface for plugging and using method
218 resolution orders other than the default (linear depth first search).
219 The C3 method resolution order added in 5.10.0 has been re-implemented as
220 a plugin, without changing its Perl-space interface. See L<perlmroapi> for
223 =head2 The C<overloading> pragma
225 This pragma allows you to lexically disable or enable overloading
226 for some or all operations. (Yuval Kogman)
228 =head2 C<\N> regex escape
230 A new regex escape has been added, C<\N>. It will match any character that
231 is not a newline, independently from the presence or absence of the single
232 line match modifier C</s>. (If C<\N> is followed by an opening brace and
233 by a letter, perl will still assume that a Unicode character name is
234 coming, so compatibility is preserved.) (Rafael Garcia-Suarez)
236 =head2 Implicit strictures
238 Using the C<use VERSION> syntax with a version number greater or equal
239 to 5.11.0 will also lexically enable strictures just like C<use strict>
240 would do (in addition to enabling features.) So, the following:
249 =head2 Parallel tests
251 The core distribution can now run its regression tests in parallel on
252 Unix-like platforms. Instead of running C<make test>, set C<TEST_JOBS> in
253 your environment to the number of tests to run in parallel, and run
254 C<make test_harness>. On a Bourne-like shell, this can be done as
256 TEST_JOBS=3 make test_harness # Run 3 tests in parallel
258 An environment variable is used, rather than parallel make itself, because
259 L<TAP::Harness> needs to be able to schedule individual non-conflicting test
260 scripts itself, and there is no standard interface to C<make> utilities to
261 interact with their job schedulers.
263 Note that currently some test scripts may fail when run in parallel (most
264 notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts
265 again sequentially and see if the failures go away.
267 =head2 The C<...> operator
269 A new operator, C<...>, nicknamed the Yada Yada operator, has been added.
270 It is intended to mark placeholder code, that is not yet implemented.
271 See L<perlop/"Yada Yada Operator">. (chromatic)
273 =head2 DTrace support
275 Some support for DTrace has been added. See "DTrace support" in F<INSTALL>.
277 =head2 Support for C<configure_requires> in CPAN module metadata
279 Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> keyword
280 in the C<META.yml> metadata file included in most recent CPAN distributions.
281 This allows distribution authors to specify configuration prerequisites that
282 must be installed before running F<Makefile.PL> or F<Build.PL>.
284 See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for more
285 on how to specify C<configure_requires> when creating a distribution for CPAN.
287 =head2 The C<each> function can now operate on arrays
289 =head2 Perl's core time-related functions are now Y2038 compliand
291 =head2 The variable C<$,> may now be tied
293 =head2 // now behaves like || in when clauses
295 =head2 You can now set C<-W> from the C<PERL5OPT> environment varialbe
299 =head1 Modules and Pragmata
301 =head2 New Modules and Pragmata
307 This is a new lexically-scoped alternative for the C<Fatal> module.
308 The bundled version is 2.06_01. Note that in this release, using a string
309 eval when C<autodie> is in effect can cause the autodie behaviour to leak
310 into the surrounding scope. See L<autodie/"BUGS"> for more details.
312 =item C<Compress::Raw::Bzip2>
314 This has been added to the core (version 2.020).
318 This pragma establishes an ISA relationship with base classes at compile
319 time. It provides the key feature of C<base> without the feature creep.
321 =item C<Parse::CPAN::Meta>
323 This has been added to the core (version 1.39).
327 =head2 Pragmata Changes
333 See L</"The C<overloading> pragma"> above.
337 Upgraded from version 0.08 to 0.09.
341 Upgraded from version 1.02 to 1.03.
345 Upgraded from version 2.13 to 2.14. See L<parent> for a replacement.
349 Upgraded from version 0.22 to 0.23.
353 Upgraded from version 0.22 to 0.23.
357 Upgraded from version 0.22 to 0.23.
361 Upgraded from version 1.06 to 1.07.
363 The Unicode F<NameAliases.txt> database file has been added. This has the
364 effect of adding some extra C<\N> character names that formerly wouldn't
365 have been recognised; for example, C<"\N{LATIN CAPITAL LETTER GHA}">.
369 Upgraded from version 1.13 to 1.17.
373 The meaning of the C<:5.10> and C<:5.10.X> feature bundles has
374 changed slightly. The last component, if any (i.e. C<X>) is simply ignored.
375 This is predicated on the assumption that new features will not, in
376 general, be added to maintenance releases. So C<:5.10> and C<:5.10.X>
377 have identical effect. This is a change to the behaviour documented for
382 Upgraded from version 2.13 to 2.14 (this was just a version bump; there
383 were no functional changes).
387 Upgraded from version 0.5565 to 0.62.
391 Upgraded from version 1.06 to 1.07.
395 Upgraded from version 1.06 to 1.07.
399 See L</"The C<overloading> pragma"> above.
403 Upgraded from version 0.74 to 0.77.
407 =head2 Updated Modules
411 =item C<Archive::Extract>
413 Upgraded from version 0.24 to 0.34.
415 =item C<Archive::Tar>
417 Upgraded from version 1.38 to 1.52.
419 =item C<Attribute::Handlers>
421 Upgraded from version 0.79 to 0.85.
425 Upgraded from version 5.63 to 5.68.
429 Upgraded from version 1.05 to 1.06.
433 Upgraded from version 1.17 to 1.22.
437 Upgraded from version 1.05 to 1.11.
441 Upgraded from version 0.83 to 0.89.
445 Upgraded from version 1.09 to 1.11.
449 Upgraded from version 1.01 to 1.02.
453 Upgraded from version 1.10 to 1.11.
457 Upgraded from version 1.08 to 1.11.
459 L<Carp> now includes all the necessary code to function. Previously, it
460 used to be a lightweight placeholder that loaded the actual code from
461 C<Carp::Heavy> on demand. C<Carp::Heavy> is now a simple, empty module
462 kept for backwards compatibility for programs that used to pre-load it.
467 Upgraded from version 3.29 to 3.43.
468 (also includes the "default_value for popup_menu()" fix from 3.45).
470 =item C<Compress::Zlib>
472 Upgraded from version 2.008 to 2.020.
476 Upgraded from version 1.9205 to 1.9402. C<CPAN::FTP> has a local fix to
477 stop it being too verbose on download failure.
481 Upgraded from version 0.84 to 0.88.
483 =item C<CPANPLUS::Dist::Build>
485 Upgraded from version 0.06_02 to 0.36.
489 Upgraded from version 3.25_01 to 3.30.
491 =item C<Data::Dumper>
493 Upgraded from version 2.121_14 to 2.124.
497 Upgraded from version 1.01 to 1.02.
501 Upgraded from version 1.816_1 to 1.820.
503 =item C<Devel::PPPort>
505 Upgraded from version 3.13 to 3.19.
509 Upgraded from version 2.36_01 to 2.39.
513 Upgraded from version 5.45 to 5.47.
517 Upgraded from version 1.01 to 1.03.
521 Upgraded from version 1.12 to 1.13.
525 Upgraded from version 1.08 to 1.10.
529 Upgraded from version 2.23 to 2.35.
533 Upgraded from version 1.10 to 1.11.
537 Upgraded from version 5.62 to 5.63.
539 =item C<ExtUtils::CBuilder>
541 Upgraded from version 0.21 to 0.2602.
543 =item C<ExtUtils::Command>
545 Upgraded from version 1.13 to 1.16.
547 =item C<ExtUtils::Constant>
549 Upgraded from 0.20 to 0.22. (Note that neither of these versions are
552 =item C<ExtUtils::Embed>
554 Upgraded from version 1.27 to 1.28.
556 =item C<ExtUtils::Install>
558 Upgraded from version 1.44 to 1.54.
560 =item C<ExtUtils::MakeMaker>
562 Upgraded from version 6.42 to 6.55_02.
564 Note that C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish>
565 have been removed from this distribution.
567 =item C<ExtUtils::Manifest>
569 Upgraded from version 1.51_01 to 1.56.
571 =item C<ExtUtils::ParseXS>
573 Upgraded from version 2.18_02 to 2.2002.
577 Upgraded from version 1.05 to 2.06_01. See also the new pragma C<autodie>.
579 =item C<File::Basename>
581 Upgraded from version 2.76 to 2.77.
583 =item C<File::Compare>
585 Upgraded from version 1.1005 to 1.1006.
589 Upgraded from version 2.11 to 2.14.
591 File::Copy now always return 0 (not "") on failure.
595 Upgraded from version 0.14 to 0.20.
599 Upgraded from version 1.12 to 1.14.
603 Upgraded from version 2.04 to 2.07_03.
607 Upgraded from version 3.2501 to 3.30.
611 Upgraded from version 1.00 to 1.01.
613 Added -X overloading, -M, -C and -A.
617 Upgraded from version 0.18 to 0.22.
621 Upgraded from version 1.07 to 1.08.
625 Upgraded from version 2.01 to 2.02.
627 =item C<Filter::Simple>
629 Upgraded from version 0.82 to 0.84.
631 =item C<Filter::Util::Call>
633 Upgraded from version 1.07 to 1.08.
637 Upgraded from version 1.49 to 1.50.
641 Upgraded from version 1.08 to 1.09.
643 =item C<Getopt::Long>
645 Upgraded from version 2.37 to 2.38.
647 =item C<Hash::Util::FieldHash>
649 Upgraded from version 1.03 to 1.04. This fixes a memory leak.
651 =item C<I18N::Collate>
653 Upgraded from version 1.00 to 1.01.
657 Upgraded from version 1.23_01 to 1.25.
659 This makes non-blocking mode work on Windows in C<IO::Socket::INET>
662 =item C<IO::Compress::*>
664 Upgraded from version 2.008 to 2.020.
668 Upgraded from version 1.06 to 1.07.
672 Upgraded from version 1.27 to 1.28.
676 Upgraded from version 1.30_01 to 1.31.
680 Upgraded from version 1.07 to 1.09.
684 Upgraded from version 0.40_1 to 0.46.
688 Upgraded from version 1.02 to 1.04.
692 Upgraded from version 1.05 to 2.01.
696 Upgraded from version 0.5565 to 0.62.
700 Upgraded from version 1.19 to 1.21.
702 =item C<Locale::MakeText>
704 Upgraded from version 1.12 to 1.13.
706 =item C<Log::Message>
708 Upgraded from version 0.01 to 0.02.
710 =item C<Math::BigFloat>
712 Upgraded from version 1.59 to 1.60.
714 =item C<Math::BigInt>
716 Upgraded from version 1.88 to 1.89.
718 =item C<Math::BigInt::FastCalc>
720 Upgraded from version 0.16 to 0.19.
722 =item C<Math::BigRat>
724 Upgraded from version 0.21 to 0.22.
726 =item C<Math::Complex>
728 Upgraded from version 1.37 to 1.56.
732 Upgraded from version 1.04 to 1.20.
736 Upgraded from version 1.01_02 to 1.01_03 (just a minor documentation
739 =item C<Module::Build>
741 Upgraded from version 0.2808_01 to 0.34_02.
743 =item C<Module::CoreList>
745 Upgraded from version 2.13 to 2.18. This release no longer contains the
746 C<%Module::CoreList::patchlevel> hash.
748 =item C<Module::Load>
750 Upgraded from version 0.12 to 0.16.
752 =item C<Module::Load::Conditional>
754 Upgraded from version 0.22 to 0.30.
756 =item C<Module::Loaded>
758 Upgraded from version 0.01 to 0.02.
760 =item C<Module::Pluggable>
762 Upgraded from version 3.6 to 3.9.
766 Upgraded from version 1.07 to 1.08.
770 Upgraded from version 2.33 to 2.36.
774 Upgraded from version 0.60_01 to 0.64.
776 =item C<Object::Accessor>
778 Upgraded from version 0.32 to 0.34.
782 Upgraded from version 1.03 to 1.04.
784 =item C<Package::Constants>
786 Upgraded from version 0.01 to 0.02.
790 Upgraded from version 1.04 to 1.06.
794 Upgraded from version 0.04 to 0.07.
798 Upgraded from version 2.16 to 2.22.
802 Upgraded from version 1.35 to 1.37.
806 Upgrade from version 3.14_02 to 3.15.
810 Upgraded from version 3.05 to 3.07.
814 Upgraded from version 3.08 to 3.13.
818 Upgraded from version 1.13 to 1.17.
822 Upgraded from 2.12 to 2.18.
824 =item C<Scalar::Util>
826 Upgraded from version 1.19 to 1.21.
830 Upgraded from 1.01 to 1.02.
834 Upgraded from 1.11 to 1.17.
838 Upgraded from 1.80 to 1.82.
842 Upgraded from 2.18 to 2.20.
846 Upgraded from version 2.13 to 2.14. Please see L</Deprecations>.
850 Upgraded from version 1.06 to 1.07.
854 Upgraded from version 0.22 to 0.27.
856 =item C<Term::ANSIColor>
858 Upgraded from version 1.12 to 2.01.
860 =item C<Term::ReadLine>
862 Upgraded from version 1.03 to 1.04.
866 Upgraded from version 0.18 to 0.20.
868 =item C<Test::Harness>
870 Upgraded from version 2.64 to 3.17.
872 Note that one side-effect of the 2.x to 3.x upgrade is that the
873 experimental C<Test::Harness::Straps> module (and its supporting
874 C<Assert>, C<Iterator>, C<Point> and C<Results> modules) have been
875 removed. If you still need this, then they are available in the
876 (unmaintained) C<Test-Harness-Straps> distribution on CPAN.
878 =item C<Test::Simple>
880 Upgraded from version 0.72 to 0.92.
882 =item C<Text::ParseWords>
884 Upgraded from version 3.26 to 3.27.
888 Upgraded from version 2007.1117 to 2009.0305.
892 Upgraded from version 2006.1117 to 2009.0305.
894 =item C<Thread::Queue>
896 Upgraded from version 2.00 to 2.11.
898 =item C<Thread::Semaphore>
900 Upgraded from version 2.01 to 2.09.
904 Upgraded from version 1.67 to 1.73.
906 =item C<threads::shared>
908 Upgraded from version 1.14 to 1.29.
910 =item C<Tie::RefHash>
912 Upgraded from version 1.37 to 1.38.
914 =item C<Tie::StdHandle>
916 This has documentation changes, and has been assigned a version for the
917 first time: version 4.2.
921 Upgraded from version 1.9711 to 1.9719.
925 Upgraded from version 1.18 to 1.1901.
929 Upgraded from version 1.12 to 1.15.
931 =item C<Unicode::Normalize>
933 Upgraded from version 1.02 to 1.03.
935 =item C<Unicode::UCD>
937 Upgraded from version 0.25 to 0.27.
939 C<charinfo()> now works on Unified CJK code points added to later versions
942 C<casefold()> has new fields returned to provide both a simpler interface
943 and previously missing information. The old fields are retained for
944 backwards compatibility. Information about Turkic-specific code points is
947 The documentation has been corrected and expanded.
951 Upgraded from version 1.04 to 1.05.
953 UNIVERSAL->import() is now deprecated.
958 Upgraded from version 0.34 to 0.39.
960 =item C<Win32API::File>
962 Upgraded from version 0.1001_01 to 0.1101.
966 Upgraded from version 0.08 to 0.10.
970 =head1 Utility Changes
976 Now looks in C<include-fixed> too, which is a recent addition to gcc's
981 No longer incorrectly treats enum values like macros (Daniel Burr).
983 Now handles C++ style constants (C<//>) properly in enums. (A patch from
984 Rainer Weikusat was used; Daniel Burr also proposed a similar fix).
988 C<LVALUE> subroutines now work under the debugger.
990 The debugger now correctly handles proxy constant subroutines, and
996 Perlbug now uses %Module::CoreList::bug_tracker to print out upstream bug tracker URLs.
998 Where the user names a module that their bug report is about, and we know the
999 URL for its upstream bug tracker, provide a message to the user explaining
1000 that the core copies the CPAN version directly, and provide the URL for
1001 reporting the bug directly to upstream.
1005 Perl 5.11.0 added a new utility F<perlthanks>, which is a variant of
1006 F<perlbug>, but for sending non-bug-reports to the authors and maintainers
1007 of Perl. Getting nothing but bug reports can become a bit demoralising:
1008 we'll see if this changes things.
1012 =head1 New Documentation
1018 This contains instructions on how to build perl for the Haiku platform.
1022 This describes the new interface for pluggable Method Resolution Orders.
1026 This document, by Richard Foley, provides an introduction to the use of
1027 performance and optimization techniques which can be used with particular
1028 reference to perl programs.
1030 =item L<perlrepository>
1032 This describes how to access the perl source using the I<git> version
1037 This describes the new F<perlthanks> utility.
1041 =head1 Changes to Existing Documentation
1043 The various large C<Changes*> files (which listed every change made to perl
1044 over the last 18 years) have been removed, and replaced by a small file,
1045 also called C<Changes>, which just explains how that same information may
1046 be extracted from the git version control system.
1048 The file F<Porting/patching.pod> has been deleted, as it mainly described
1049 interacting with the old Perforce-based repository, which is now obsolete.
1050 Information still relevant has been moved to L<perlrepository>.
1052 L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
1053 generated at build time, rather than being shipped as part of the release.
1055 =head2 Documented -X overloading.
1057 =head2 Documented that when() treats specially most of the filetest operators
1059 =head2 Documented that DESTROY is subject to AUTOLOAD, and the related optimisations.
1061 =head2 Documented when as a syntax modifier
1063 =head2 Eliminated "Old Perl threads tutorial", which describes 5005 threads.
1065 pod/perlthrtut.pod is the same material reworked for ithreads.
1067 =head2 Removed a link to the attrs pragma, which has now been removed.
1069 =head2 update PERL_MEM_LOG in perlhack.pod
1071 =head2 Correct previous documentation: v-strings are not deprecated
1073 With version objects, we need them to use MODULE VERSION syntax. This
1074 patch removes the deprecation note.
1077 =head1 Performance Enhancements
1083 A new internal cache means that C<isa()> will often be faster.
1087 The implementation of C<C3> Method Resolution Order has been optimised -
1088 linearisation for classes with single inheritance is 40% faster. Performance
1089 for multiple inheritance is unchanged.
1093 Under C<use locale>, the locale-relevant information is now cached on
1094 read-only values, such as the list returned by C<keys %hash>. This makes
1095 operations such as C<sort keys %hash> in the scope of C<use locale> much
1100 Empty C<DESTROY> methods are no longer called.
1104 Faster sv_utf8_upgrade()
1108 Speed up keys() on empty hash
1112 =head1 Installation and Configuration Improvements
1114 =head2 F<ext/> reorganisation
1116 The layout of directories in F<ext> has been revised. Specifically, all
1117 extensions are now flat, and at the top level, with C</> in pathnames
1118 replaced by C<->, so that F<ext/Data/Dumper/> is now F<ext/Data-Dumper/>,
1119 etc. The names of the extensions as specified to F<Configure>, and as
1120 reported by C<%Config::Config> under the keys C<dynamic_ext>,
1121 C<known_extensions>, C<nonxs_ext> and C<static_ext> have not changed, and
1122 still use C</>. Hence this change will not have any affect once perl is
1123 installed. However, C<Attribute::Handlers>, C<Safe> and C<mro> have now
1124 become extensions in their own right, so if you run F<Configure> with
1125 options to specify an exact list of extensions to build, you will need to
1126 change it to account for this.
1128 For 5.11.1, it is planned that many dual-life modules will have been moved
1129 from F<lib> to F<ext>; again this will have no effect on an installed
1130 perl, but will matter if you invoke F<Configure> with a pre-canned list of
1131 extensions to build.
1133 =head2 Configuration improvements
1135 If C<vendorlib> and C<vendorarch> are the same, then they are only added to
1138 C<$Config{usedevel}> and the C-level C<PERL_USE_DEVEL> are now defined if
1139 perl is built with C<-Dusedevel>.
1141 F<Configure> will enable use of C<-fstack-protector>, to provide protection
1142 against stack-smashing attacks, if the compiler supports it.
1144 F<Configure> will now determine the correct prototypes for re-entrant
1145 functions, and for C<gconvert>, if you are using a C++ compiler rather
1148 On Unix, if you build from a tree containing a git repository, the
1149 configuration process will note the commit hash you have checked out, for
1150 display in the output of C<perl -v> and C<perl -V>. Unpushed local commits
1151 are automatically added to the list of local patches displayed by
1154 =head2 Compilation improvements
1156 As part of the flattening of F<ext>, all extensions on all platforms are
1157 built by F<make_ext.pl>. This replaces the Unix-specific
1158 F<ext/util/make_ext>, VMS-specific F<make_ext.com> and Win32-specific
1159 F<win32/buildext.pl>.
1161 =head2 Platform Specific Changes
1167 Removed F<libbsd> for AIX 5L and 6.1. Only flock() was used from F<libbsd>.
1169 Removed F<libgdbm> for AIX 5L and 6.1. The F<libgdbm> is delivered as an
1170 optional package with the AIX Toolbox. Unfortunately the 64 bit version
1173 Hints changes mean that AIX 4.2 should work again.
1177 On Cygwin we now strip the last number from the DLL. This has been the
1178 behaviour in the cygwin.com build for years. The hints files have been
1183 The hints files now identify the correct threading libraries on FreeBSD 7
1188 We now work around a bizarre preprocessor bug in the Irix 6.5 compiler:
1189 C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't.
1193 Patches from the Haiku maintainers have been merged in. Perl should now
1198 Perl should now build on MirOS BSD.
1202 Hints now supports versions 5.*.
1206 Various changes from Stratus have been merged in.
1210 There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK.
1214 Improved message window handling means that C<alarm> and C<kill> messages
1215 will no longer be dropped under race conditions.
1219 Reads from the in-memory temporary files of C<PerlIO::scalar> used to fail
1220 if C<$/> was set to a numeric reference (to indicate record-style reads).
1223 VMS now supports C<getgrgid>.
1225 Many improvements and cleanups have been made to the VMS file name handling
1226 and conversion code.
1228 Enabling the C<PERL_VMS_POSIX_EXIT> logical name now encodes a POSIX exit
1229 status in a VMS condition value for better interaction with GNV's bash
1230 shell and other utilities that depend on POSIX exit values. See
1231 L<perlvms/"$?"> for details.
1233 File::Copy now detects Unix compatibility mode on VMS.
1237 =head1 Selected Bug Fixes
1243 =item C<-I> on shebang line now adds directories in front of @INC.
1244 as documented, and as does C<-I> when specified on the command-line.
1249 * C<kill> is now fatal when called on non-numeric process identifiers.
1250 Previously, an 'undef' process identifier would be interpreted as a request to
1251 kill process "0", which would terminate the current process group on POSIX
1252 systems. Since process identifiers are always integers, killing a non-numeric
1253 process is now fatal.
1257 5.10.0 inadvertently disabled an optimisation, which caused a measurable
1258 performance drop in list assignment, such as is often used to assign
1259 function parameters from C<@_>. The optimisation has been re-instated, and
1260 the performance regression fixed.
1264 Fixed memory leak on C<while (1) { map 1, 1 }> [RT #53038].
1268 Some potential coredumps in PerlIO fixed [RT #57322,54828].
1272 The debugger now works with lvalue subroutines.
1276 The debugger's C<m> command was broken on modules that defined constants
1281 C<crypt()> and string complement could return tainted values for untainted
1282 arguments [RT #59998].
1286 The C<-i.suffix> command-line switch now recreates the file using
1287 restricted permissions, before changing its mode to match the original
1288 file. This eliminates a potential race condition [RT #60904].
1292 On some UNIX systems, the value in C<$?> would not have the top bit set
1293 (C<$? & 128>) even if the child core dumped.
1297 Under some circumstances, $^R could incorrectly become undefined
1302 (XS) In various hash functions, passing a pre-computed hash to when the
1303 key is UTF-8 might result in an incorrect lookup.
1307 (XS) Including F<XSUB.h> before F<perl.h> gave a compile-time error
1312 C<< $object->isa('Foo') >> would report false if the package C<Foo> didn't
1313 exist, even if the object's C<@ISA> contained C<Foo>.
1317 Various bugs in the new-to 5.10.0 mro code, triggered by manipulating
1318 C<@ISA>, have been found and fixed.
1322 Bitwise operations on references could crash the interpreter, e.g.
1323 C<$x=\$y; $x |= "foo"> [RT #54956].
1327 Patterns including alternation might be sensitive to the internal UTF-8
1328 representation, e.g.
1330 my $byte = chr(192);
1331 my $utf8 = chr(192); utf8::upgrade($utf8);
1332 $utf8 =~ /$byte|X}/i; # failed in 5.10.0
1336 Within UTF8-encoded Perl source files (i.e. where C<use utf8> is in
1337 effect), double-quoted literal strings could be corrupted where a C<\xNN>,
1338 C<\0NNN> or C<\N{}> is followed by a literal character with ordinal value
1339 greater than 255 [RT #59908].
1343 C<B::Deparse> failed to correctly deparse various constructs:
1344 C<readpipe STRING> [RT #62428], C<CORE::require(STRING)> [RT #62488],
1345 C<sub foo(_)> [RT #62484].
1349 Using C<setpgrp()> with no arguments could corrupt the perl stack.
1353 The block form of C<eval> is now specifically trappable by C<Safe> and
1354 C<ops>. Previously it was erroneously treated like string C<eval>.
1358 In 5.10.0, the two characters C<[~> were sometimes parsed as the smart
1359 match operator (C<~~>) [RT #63854].
1363 In 5.10.0, the C<*> quantifier in patterns was sometimes treated as
1364 C<{0,32767}> [RT #60034, #60464]. For example, this match would fail:
1366 ("ab" x 32768) =~ /^(ab)*$/
1370 C<shmget> was limited to a 32 bit segment size on a 64 bit OS [RT #63924].
1374 Using C<next> or C<last> to exit a C<given> block no longer produces a
1375 spurious warning like the following:
1377 Exiting given via last at foo.pl line 123
1381 On Windows, C<'.\foo'> and C<'..\foo'> were treated differently than
1382 C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492].
1386 Assigning a format to a glob could corrupt the format; e.g.:
1388 *bar=*foo{FORMAT}; # foo format now bad
1392 Attempting to coerce a typeglob to a string or number could cause an
1393 assertion failure. The correct error message is now generated,
1394 C<Can't coerce GLOB to I<$type>>.
1398 Under C<use filetest 'access'>, C<-x> was using the wrong access mode. This
1399 has been fixed [RT #49003].
1403 C<length> on a tied scalar that returned a Unicode value would not be
1404 correct the first time. This has been fixed.
1408 Using an array C<tie> inside in array C<tie> could SEGV. This has been
1413 A race condition inside C<PerlIOStdio_close()> has been identified and
1414 fixed. This used to cause various threading issues, including SEGVs.
1418 In C<unpack>, the use of C<()> groups in scalar context was internally
1419 placing a list on the interpreter's stack, which manifested in various
1420 ways, including SEGVs. This is now fixed [RT #50256].
1424 Magic was called twice in C<substr>, C<\&$x>, C<tie $x, $m> and C<chop>.
1425 These have all been fixed.
1429 A 5.10.0 optimisation to clear the temporary stack within the implicit
1430 loop of C<s///ge> has been reverted, as it turned out to be the cause of
1431 obscure bugs in seemingly unrelated parts of the interpreter [commit
1436 The line numbers for warnings inside C<elsif> are now correct.
1440 The C<..> operator now works correctly with ranges whose ends are at or
1441 close to the values of the smallest and largest integers.
1445 C<binmode STDIN, ':raw'> could lead to segmentation faults on some platforms.
1446 This has been fixed [RT #54828].
1450 An off-by-one error meant that C<index $str, ...> was effectively being
1451 executed as C<index "$str\0", ...>. This has been fixed [RT #53746].
1455 Various leaks associated with named captures in regexes have been fixed
1460 A weak reference to a hash would leak. This was affecting C<DBI>
1465 Using (?|) in a regex could cause a segfault [RT #59734].
1469 Use of a UTF-8 C<tr//> within a closure could cause a segfault [RT #61520].
1473 Calling C<sv_chop()> or otherwise upgrading an SV could result in an
1474 unaligned 64-bit access on the SPARC architecture [RT #60574].
1478 In the 5.10.0 release, C<inc_version_list> would incorrectly list
1479 C<5.10.*> after C<5.8.*>; this affected the C<@INC> search order
1484 In 5.10.0, C<pack "a*", $tainted_value> returned a non-tainted value
1489 In 5.10.0, C<printf> and C<sprintf> could produce the fatal error
1490 C<panic: utf8_mg_pos_cache_update> when printing UTF-8 strings
1495 In the 5.10.0 release, a dynamically created C<AUTOLOAD> method might be
1496 missed (method cache issue) [RT #60220,60232].
1500 In the 5.10.0 release, a combination of C<use feature> and C<//ee> could
1501 cause a memory leak [RT #63110].
1505 C<-C> on the shebang (C<#!>) line is once more permitted if it is also
1506 specified on the command line. C<-C> on the shebang line used to be a
1507 silent no-op I<if> it was not also on the command line, so perl 5.10.0
1508 disallowed it, which broke some scripts. Now perl checks whether it is
1509 also on the command line and only dies if it is not [RT #67880].
1513 In 5.10.0, certain types of re-entrant regular expression could crash,
1514 or cause the following assertion failure [RT #60508]:
1516 Assertion rx->sublen >= (s - rx->subbeg) + i failed
1520 =head1 New or Changed Diagnostics
1524 =item C<panic: sv_chop %s>
1526 This new fatal error occurs when the C routine C<Perl_sv_chop()> was
1527 passed a position that is not within the scalar's string buffer. This
1528 could be caused by buggy XS code, and at this point recovery is not
1531 =item C<Can't locate package %s for the parents of %s>
1533 This warning has been removed. In general, it only got produced in
1534 conjunction with other warnings, and removing it allowed an ISA lookup
1535 optimisation to be added.
1537 =item C<v-string in use/require is non-portable>
1539 This warning has been removed.
1541 =item C<Deep recursion on subroutine "%s">
1543 It is now possible to change the depth threshold for this warning from the
1544 default of 100, by recompiling the F<perl> binary, setting the C
1545 pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value.
1549 =head1 Changed Internals
1555 The J.R.R. Tolkien quotes at the head of C source file have been checked and
1556 proper citations added, thanks to a patch from Tom Christiansen.
1560 C<vcroak()> now accepts a null first argument. In addition, a full audit
1561 was made of the "not NULL" compiler annotations, and those for several
1562 other internal functions were corrected.
1566 New macros C<dSAVEDERRNO>, C<dSAVE_ERRNO>, C<SAVE_ERRNO>, C<RESTORE_ERRNO>
1567 have been added to formalise the temporary saving of the C<errno>
1572 The function C<Perl_sv_insert_flags> has been added to augment
1577 The function C<Perl_newSV_type(type)> has been added, equivalent to
1578 C<Perl_newSV()> followed by C<Perl_sv_upgrade(type)>.
1582 The function C<Perl_newSVpvn_flags()> has been added, equivalent to
1583 C<Perl_newSVpvn()> and then performing the action relevant to the flag.
1585 Two flag bits are currently supported.
1591 This will call C<SvUTF8_on()> for you. (Note that this does not convert an
1592 sequence of ISO 8859-1 characters to UTF-8). A wrapper, C<newSVpvn_utf8()>
1593 is available for this.
1597 Call C<sv_2mortal()> on the new SV.
1601 There is also a wrapper that takes constant strings, C<newSVpvs_flags()>.
1605 The function C<Perl_croak_xs_usage> has been added as a wrapper to
1610 The functions C<PerlIO_find_layer> and C<PerlIO_list_alloc> are now
1615 C<PL_na> has been exterminated from the core code, replaced by local STRLEN
1616 temporaries, or C<*_nolen()> calls. Either approach is faster than C<PL_na>,
1617 which is a pointer deference into the interpreter structure under ithreads,
1618 and a global variable otherwise.
1622 C<Perl_mg_free()> used to leave freed memory accessible via SvMAGIC() on
1623 the scalar. It now updates the linked list to remove each piece of magic
1628 Under ithreads, the regex in C<PL_reg_curpm> is now reference counted. This
1629 eliminates a lot of hackish workarounds to cope with it not being reference
1634 C<Perl_mg_magical()> would sometimes incorrectly turn on C<SvRMAGICAL()>.
1635 This has been fixed.
1639 The I<public> IV and NV flags are now not set if the string value has
1640 trailing "garbage". This behaviour is consistent with not setting the
1641 public IV or NV flags if the value is out of range for the type.
1645 SV allocation tracing has been added to the diagnostics enabled by C<-Dm>.
1646 The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if
1647 that was enabled when the F<perl> binary was compiled.
1651 Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have been
1652 replaced by C<NULL> in the core code, and non-dual-life modules, as C<NULL>
1653 is clearer to those unfamiliar with the core code.
1657 A macro C<MUTABLE_PTR(p)> has been added, which on (non-pedantic) gcc will
1658 not cast away C<const>, returning a C<void *>. Macros C<MUTABLE_SV(av)>,
1659 C<MUTABLE_SV(cv)> etc build on this, casting to C<AV *> etc without
1660 casting away C<const>. This allows proper compile-time auditing of
1661 C<const> correctness in the core, and helped picked up some errors (now
1666 Macros C<mPUSHs()> and C<mXPUSHs()> have been added, for pushing SVs on the
1667 stack and mortalizing them.
1671 Use of the private structure C<mro_meta> has changed slightly. Nothing
1672 outside the core should be accessing this directly anyway.
1676 A new tool, C<Porting/expand-macro.pl> has been added, that allows you
1677 to view how a C preprocessor macro would be expanded when compiled.
1678 This is handy when trying to decode the macro hell that is the perl
1685 Many modules updated from CPAN incorporate new tests.
1687 Several tests that have the potential to hang forever if they fail now
1688 incorporate a "watchdog" functionality that will kill them after a timeout,
1689 which helps ensure that C<make test> and C<make test_harness> run to
1690 completion automatically. (Jerry Hedden).
1692 Some core-specific tests have been added:
1696 =item t/comp/retainedlines.t
1698 Check that the debugger can retain source lines from C<eval>.
1700 =item t/io/perlio_fail.t
1702 Check that bad layers fail.
1704 =item t/io/perlio_leaks.t
1706 Check that PerlIO layers are not leaking.
1708 =item t/io/perlio_open.t
1710 Check that certain special forms of open work.
1714 General PerlIO tests.
1718 Check that there is no unexpected interaction between the internal types
1719 C<PVBM> and C<PVGV>.
1721 =item t/mro/package_aliases.t
1723 Check that mro works properly in the presence of aliased packages.
1727 Tests for C<dbmopen> and C<dbmclose>.
1729 =item t/op/index_thr.t
1731 Tests for the interaction of C<index> and threads.
1733 =item t/op/pat_thr.t
1735 Tests for the interaction of esoteric patterns and threads.
1739 Test that C<qr> doesn't leak.
1741 =item t/op/reg_email_thr.t
1743 Tests for the interaction of regex recursion and threads.
1745 =item t/op/regexp_qr_embed_thr.t
1747 Tests for the interaction of patterns with embedded C<qr//> and threads.
1749 =item t/op/regexp_unicode_prop.t
1751 Tests for Unicode properties in regular expressions.
1753 =item t/op/regexp_unicode_prop_thr.t
1755 Tests for the interaction of Unicode properties and threads.
1757 =item t/op/reg_nc_tie.t
1759 Test the tied methods of C<Tie::Hash::NamedCapture>.
1761 =item t/op/reg_posixcc.t
1763 Check that POSIX character classes behave consistently.
1767 Check that exportable C<re> functions in F<universal.c> work.
1769 =item t/op/setpgrpstack.t
1771 Check that C<setpgrp> works.
1773 =item t/op/substr_thr.t
1775 Tests for the interaction of C<substr> and threads.
1777 =item t/op/upgrade.t
1779 Check that upgrading and assigning scalars works.
1781 =item t/uni/lex_utf8.t
1783 Check that Unicode in the lexer works.
1787 Check that Unicode and C<tie> work.
1791 =head1 Known Problems
1793 This is a list of some significant unfixed bugs, which are regressions
1794 from either 5.10.0 or 5.8.x.
1800 C<List::Util::first> misbehaves in the presence of a lexical C<$_>
1801 (typically introduced by C<my $_> or implicitly by C<given>). The variable
1802 which gets set for each iteration is the package variable C<$_>, not the
1803 lexical C<$_> [RT #67694].
1805 A similar issue may occur in other modules that provide functions which
1806 take a block as their first argument, like
1808 foo { ... $_ ...} list
1812 The C<charnames> pragma may generate a run-time error when a regex is
1813 interpolated [RT #56444]:
1815 use charnames ':full';
1816 my $r1 = qr/\N{THAI CHARACTER SARA I}/;
1817 "foo" =~ $r1; # okay
1818 "foo" =~ /$r1+/; # runtime error
1820 A workaround is to generate the character outside of the regex:
1822 my $a = "\N{THAI CHARACTER SARA I}";
1827 Some regexes may run much more slowly when run in a child thread compared
1828 with the thread the pattern was compiled into [RT #55600].
1835 The following items are now deprecated.
1841 C<Switch> is buggy and should be avoided. From perl 5.11.0 onwards, it is
1842 intended that any use of the core version of this module will emit a
1843 warning, and that the module will eventually be removed from the core
1844 (probably in perl 5.14.0). See L<perlsyn/"Switch statements"> for its
1849 C<suidperl> has been removed. It used to provide a mechanism to
1850 emulate setuid permission bits on systems that don't support it properly.
1854 Deprecate assignment to $[
1858 Remove attrs, which has been deprecated since 1999/10/02.
1862 Deprecate use of the attribute :locked on subroutines.
1866 Deprecate using "locked" with the attributes pragma.
1870 Deprecate using "unique" with the attributes pragma.
1874 warn if ++ or -- are unable to change the value because it's beyond the limit of representation
1876 This uses a new warnings category: "imprecision".
1881 Make lc/uc/lcfirst/ucfirst warn when passed undef.
1885 Show constant in "Useless use of a constant in void context"
1889 Make the new warning report undef constants as undef
1893 Add a new warning, "Prototype after '%s'"
1897 Tweak the "Illegal character in prototype" warning so it's more precise when reporting illegal characters after _
1901 Unintented interpolation of $\ in regex
1905 Make overflow warnings in gmtime/localtime only occur when warnings are on
1909 Improve mro merging error messages.
1911 They are now very similar to those produced by Algorithm::C3.
1915 Amelioration of the error message "Unrecognized character %s in column %d"
1917 Changes the error message to "Unrecognized character %s; marked by <--
1918 HERE after %s<-- HERE near column %d". This should make it a little
1919 simpler to spot and correct the suspicious character.
1923 Explicitely point to $. when it causes an uninitialized warning for ranges in scalar context
1927 =head1 Acknowledgements
1929 Some of the work in this release was funded by a TPF grant.
1931 Nicholas Clark officially retired from maintenance pumpking duty at the
1932 end of 2008; however in reality he has put much effort in since then to
1933 help get 5.10.1 into a fit state to be released, including writing a
1934 considerable chunk of this perldelta.
1936 Steffen Mueller and David Golden in particular helped getting CPAN modules
1937 polished and synchronised with their in-core equivalents.
1939 Craig Berry was tireless in getting maint to run under VMS, no matter how
1940 many times we broke it for him.
1942 The other core committers contributed most of the changes, and applied most
1943 of the patches sent in by the hundreds of contributors listed in F<AUTHORS>.
1945 Much of the work of categorizing changes in this perldelta file was contributed
1946 by the following porters using changelogger.bestpractical.com:
1948 Nicholas Clark, leon, shawn, alexm, rjbs, rafl, Pedro Melo, brunorc,
1949 anonymous, ☄, Tom Hukins, anonymous, Jesse, dagolden, Moritz Onken,
1950 Mark Fowler, chorny, anonymous, tmtm
1953 Finally, thanks to Larry Wall, without whom none of this would be
1956 =head1 Reporting Bugs
1958 If you find what you think is a bug, you might check the articles
1959 recently posted to the comp.lang.perl.misc newsgroup and the perl
1960 bug database at http://rt.perl.org/perlbug/ . There may also be
1961 information at http://www.perl.org/ , the Perl Home Page.
1963 If you believe you have an unreported bug, please run the B<perlbug>
1964 program included with your release. Be sure to trim your bug down
1965 to a tiny but sufficient test case. Your bug report, along with the
1966 output of C<perl -V>, will be sent off to perlbug@perl.org to be
1967 analysed by the Perl porting team.
1969 If the bug you are reporting has security implications, which make it
1970 inappropriate to send to a publicly archived mailing list, then please send
1971 it to perl5-security-report@perl.org. This points to a closed subscription
1972 unarchived mailing list, which includes all the core committers, who be able
1973 to help assess the impact of issues, figure out a resolution, and help
1974 co-ordinate the release of patches to mitigate or fix the problem across all
1975 platforms on which Perl is supported. Please only use this address for
1976 security issues in the Perl core, not for modules independently
1977 distributed on CPAN.
1981 The F<Changes> file for an explanation of how to view exhaustive details
1984 The F<INSTALL> file for how to build Perl.
1986 The F<README> file for general stuff.
1988 The F<Artistic> and F<Copying> files for copyright information.
1995 The following changes are a filtered list of changes which weren't backported
1996 to 5.10.1. They were run through changelogger.bestpractical.com and triaged
1997 by a set of Perl 5 Porters. Changes to blead after 5945e41e have not yet
1998 been triaged or integrated.
2000 The following changes need to be
2002 1) deleted if they don't merit inclusion
2006 2) lightly copyedited and integrated into the perldelta above. Unfortunately, many of our
2007 commit messages are somewhat terse and require a bit more help to turn into something readable
2014 =head2 Move the reg_stringify logic to Perl_sv_2pv_flags
2016 =head2 mg_copy ought to take an I32
2018 =head2 Perl_store_cop_label() isn't meant to be part of the public API.
2020 =head2 Perl_gv_fetchmethod{,_autoload,_flags} are actually never* called with a non-NULL stash.
2021 So change the parameter to NN.
2024 =head2 Promote Perl_setdefout() to the public API.
2026 =head2 Add get_cvs() as a shortcut for STR_WITH_LEN() and Perl_get_cvn_flags()
2028 =head2 In Perl_newCONSTSUB(), sv should not be NULL.
2030 =head2 GvUNIQUE* have been defined as 0 since 2005/06/30 - high time to remove them.
2032 =head2 invert and rename PERL_MEM_LOG_STDERR to PERL_MEM_LOG_NOIMPL
2034 Most users who want PERL_MEM_LOG want the default implementation,
2035 give it to them. Users providing their own implementation can
2036 obtain current behavior by adding -DPERL_MEM_LOG_NOIMPL.
2037 Frankly, the average user probably wants _ENV by default too.
2039 =head2 simplify PERL_MEM_LOG
2041 This combines multiple environment variable reads into 1,
2042 where it looks for values like "2mst"
2043 -2 leading digits are atoi()d to get FD
2044 -m memory logging please
2046 -t timestamp those please.
2048 Combining these reduces overhead such that it seemed
2049 worthwhile to drop all the ifdefs. TBD whether this works
2050 in the environment that drove the original tradeoffs.
2052 If it isnt enough, Id be tempted by a global static ptr,
2053 and on 1st use, is read, seen 0, a lock is taken, and getenvar
2054 run to populate it, unlocked, proceed. This would remove
2055 iterative overheads.
2057 =head2 Add a parameter "destructing" to Gv_AMupdate()
2059 This boolean parameter indicates if the function has been called
2060 to update the overload magic table while looking up the DESTROY
2061 method. In this case, it's probably best to avoid croaking if
2062 those tables could not be updated (for example due to a method
2063 that could not be loaded.)
2065 =head2 Modify the return value of Gv_AMupdate to indicate a compilation error
2067 This way we'll restore most of the performance on object desctruction
2068 lost by the previous commit
2071 =head2 local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
2073 Re: [perl #60360] [PATCH] UPDATED: local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
2074 Message-ID: <20081112234504.GI2062@tytlal.topaz.cx>
2076 Updated patch to retain source compatibility.
2078 Plus using the correct PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS
2079 macro and running make regen.
2081 =head2 Respecting inc_version_list while processing PERL_VENDORLIB_STEM
2083 Respecting inc_version_list while processing PERL_VENDORLIB_STEM
2084 From: "Mandalemula, Rajesh" <Rajesh.Mandalemula@deshaw.com>
2086 =head2 Change PL_debug behaviour
2089 String eval lines are now saved whenever
2090 a subroutine is defined, even if the eval'd string has subsequent
2091 syntax errors. This allows the debugger to single step into these
2095 =head2 Tied filehandles now have an additional method EOF which provides the EOF type
2097 =head2 Perl is now smarter about adding a -I dir to the beginning or end of @INC
2099 =head2 On scope end, delete localized array elements that should not exist anymore, so that the array recovers its previous length. Honour EXISTS and DELETE for tied arrays.
2101 =head2 When a glob is deleted, mark its sub as ANON.
2103 =head2 Require a space or a newline after a "#line XXX" directive
2105 =head2 Forbid using "foreach" as an attribute
2107 (like all other control flow statements)
2110 =head2 Unregister signal handlers before destroying my_perl
2112 If the signal handler runs after perl_destruct() has been called, it
2113 will get an invalid (or NULL) my_perl when it asks for the
2114 thread-specific interpreter struct. This patch resets the signal
2115 handler for any signal previously handled by PL_csighandlerp to SIG_DFL
2116 before calling perl_destruct().
2118 =head2 Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
2120 Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
2121 instead of the now-removed INT handler.
2123 =head2 [perl #66452] TMPDIR not honored when opening an anonymous temporary file
2125 [perl #66452] TMPDIR not honored when opening an anonymous temporary file
2127 =head2 The attached patch to perlio.c fixes the problem of errno getting set.
2129 While I am firmly in the school of "do not look at $! except immediately
2130 after a failure", I also agree that spuriously setting it is messy. But
2131 there is just no way of knowing where your errno might have been.
2133 The problem was that PerlIO_fast_gets() (and other nearby similar
2134 capability-checking PerlIO routines) set the errno (and it was being
2135 called a lot, from sv_gets()). I think setting the errno here was
2136 a mistake: checking for "can has FOO" should not set external state,
2137 such as the errno. The patch removes that errno trashing from all those
2140 =head2 Trim all trailing / from "." in @INC when filling %INC
2142 This fixes bug #66942 : as a / was left in the directory name,
2143 $INC{"Foo.pm"} for a file loaded from the current directory
2144 was given the incorrect value "/Foo.pm".
2146 =head2 Don't enqueue pending signals during global destruction
2148 Global destruction is not signal-safe. PL_psig_pend may already
2149 be gone when the signal handler is called (with destruct_level > 0).
2150 NULL it before freeing it to prevent a race condition.
2152 =head2 Eliminate struct regexp_allocated and xpvio_allocated.
2154 Calculate memory allocation using regexp and XPVIO, and the offset of the first
2155 real structure member. This avoids tripping over alignment differences between
2156 X* and x*_allocated, because x*_allocated doesn't have a double in it.
2161 =head2 [perl #47047] Use of inherited AUTOLOAD for non-method is deprecated
2163 =head2 Remove the definitions of Null(), Nullch, Nullfp, Nullsv and PL_na when code is within the perl source tree
2165 =head2 Replace our assert-which-can-be-caught-by-eval with the real deal from the standard C library.
2167 =head2 Tweak Perl_sv_upgrade() so that references can upgrade to SVt_PV
2169 =head2 Eliminate prelen from struct regexp.
2171 =head2 Change Perl_av_iter_p() to return IV* rather than I32* (which means
2173 =head2 Reorder the external regexp flags to get RXf_PMf_STD_PMMOD into the
2175 lowest 4 bits (which saves a shift), and the "flags indicating special
2176 patterns" into contiguous bits. This makes everything a little tidier,
2177 and saves 88 bytes (woohoo!) of object file with -Os on x86 FreeBSD.
2180 =head2 Re-implement the SvOOK() hack to store the offset as a BER encoded number in the part of the PVX that is being released.
2182 fit, as chopping off 1 byte gives just enough space for recording a
2183 delta of up to 127). This allows SvOOK() to co-exist with SvIOK_on(),
2184 which means all the calls to SvOOK_off() [with the possibility of a
2185 call to sv_backoff()] in SvIOK_on() can be removed. This ought to make
2186 a lot of straight line code a little bit simpler.
2187 OOK()d scalars can now be SVt_PV, as the IVX isn't needed.
2189 =head2 Abolish wraplen from struct regexp. We're already storing it in SvCUR.
2191 =head2 Make Perl_pregcomp() use SvUTF8() of the pattern, rather than the flag bit in pmflags, to decide whether the pattern is UTF-8.
2193 =head2 Abolish RXf_UTF8. Store the UTF-8-ness of the pattern with SvUTF8().
2195 =head2 In struct regexp move the member paren_names to the IV union.
2197 =head2 Make REGEXP a type distinct from SV. (Much like AV, CV, GV, HV).
2199 =head2 Allow sv_setsv_flags() to copy SVt_REGEXP much like it copies SVt_FORMAT - the just string buffer.
2202 =head2 Correct a long-standing ithreads reference counting anonamly
2204 The reference count only needs "doubling" when the scalar is pushed onto
2205 PL_regex_padav for the second time.
2208 =head2 In PL_regexp_padav, store regexps via real references, rather than hiding them within IVs.
2210 We can do this now that they are real SV pointers.
2212 =head2 With regexps stored as real RVs, we can eliminate SvREPADTMP().
2214 =head2 REGEXPs are now stored directly in PL_regex_padav, rather than indirectly via RVs.
2216 =head2 Remove code that protected pp_qr against REGEXPs going away during global destruction whilst they were stored via true references in PL_regex_padav.
2218 =head2 Remove PM_GETRE_SAFE and PM_SETRE_SAFE as nothing uses them.
2220 =head2 Note the U8 sized space created by removing -P, and check that it is now an illegal command line flag.
2222 =head2 Pack the recycled pad offsets into an SV at PL_regex_pad[0].
2224 =head2 Re-order so that the !SvOK() case is last (which should be rare)
2226 =head2 Extend PUSHFORMAT() to take a second parameter to set retop, to save NULLing it and then reassigning.
2228 =head2 Split struct block_sub into struct block_sub and struct block_format.
2230 Split struct block_sub into struct block_sub and struct block_format.
2231 (CXt_SUB and CXt_FORMAT were using some comon members, but some members
2232 were only for one or the other.)
2234 =head2 Change the wantarray result from caller from IV to bool for the SCALAR/ARRAY case.
2236 This doesn't contradict the documentation, as there isn't any. Oops.
2239 =head2 Give G_VOID, G_SCALAR and G_ARRAY the same numeric values as OPf_WANT_VOID, OPf_WANT_SCALAR and OPf_WANT_LIST.
2242 =head2 Squeeze the context type down to 4 bits, and move the private flags to fit within the next 4 bits.
2245 =head2 In struct block change blku_type from U8 to U16, and the "spare" U8 to U16, with the lockstep changes in struct subst.
2247 struct block_sub, and instead store it in the U16 in struct block.
2250 =head2 In struct block_eval, eliminate old_in_eval and old_op_type by storing the data in blk_u16.
2253 =head2 The layout for struct block_loop under ithreads can be simplified.
2255 Instead of wedging the pad offset into a void* iterdata, and always
2256 storing PL_comppad even when it isn't used, instead do this:
2258 PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
2259 /* This is also accesible via cx->blk_loop.my_op->op_targ */
2260 PADOFFSET targoffset;
2262 and store the GV pointer in oldcompad. Pointers to pointers seems
2263 cleaner. This also allows us to eliminate the flag bit CXp_PADVAR.
2266 =head2 In XS_PerlIO_get_layers() take advantage of the implementation of
2268 In XS_PerlIO_get_layers() take advantage of the implementation of
2269 PerlIO_get_layers(), by co-opting the new SVs it creates, rather than
2273 =head2 Micro-optimise the order of the context types. [Because I can :-)]
2275 =head2 [patch] optimize OP_IS_(FILETEST|SOCKET) macros
2277 =head2 Eliminate ck_lengthconst.
2279 =head2 Chainsaw DEBUG_S out, as suggested by Vincent Pit.
2281 =head2 Unsupported private API functions are now declared "static" to prevent leakage to the public API
2283 =head2 Perl_cv_ckproto() is not part of the public API, and not used anywhere. It has been removed
2285 =head2 Remove all the 5005threads specific mutex macros, which are now vestigial.
2287 =head2 Do not honor TMPDIR for anonymous temporary files when tainting
2289 Use a default of /tmp on Unixes when TMPDIR is unset or empty, or
2290 when creation of a temporary file in it fails
2292 =head2 Add a pluggable hook in op_free()