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.
14 =head2 Switch statement changes
16 The handling of complex expressions by the C<given>/C<when> switch
17 statement has been enhanced. These enhancements are also available in
18 5.10.1 and subsequent 5.10 releases. There are two new cases where C<when> now
19 interprets its argument as a boolean, instead of an expression to be used
24 =item flip-flop operators
26 The C<..> and C<...> flip-flop operators are now evaluated in boolean
27 context, following their usual semantics; see L<perlop/"Range Operators">.
29 Note that, as in perl 5.10.0, C<when (1..10)> will not work to test
30 whether a given value is an integer between 1 and 10; you should use
31 C<when ([1..10])> instead (note the array reference).
33 However, contrary to 5.10.0, evaluating the flip-flop operators in boolean
34 context ensures it can now be useful in a C<when()>, notably for
35 implementing bistable conditions, like in:
37 when (/^=begin/ .. /^=end/) {
41 =item defined-or operator
43 A compound expression involving the defined-or operator, as in
44 C<when (expr1 // expr2)>, will be treated as boolean if the first
45 expression is boolean. (This just extends the existing rule that applies
46 to the regular or operator, as in C<when (expr1 || expr2)>.)
50 The next section details more changes brought to the semantics to
51 the smart match operator, that naturally also modify the behaviour
52 of the switch statements where smart matching is implicitly used.
53 These changers were also made for the 5.10.1 release, and will remain in
54 subsequent 5.10 releases.
56 =head2 Smart match changes
58 =head3 Changes to type-based dispatch
60 The smart match operator C<~~> is no longer commutative. The behaviour of
61 a smart match now depends primarily on the type of its right hand
62 argument. Moreover, its semantics have been adjusted for greater
63 consistency or usefulness in several cases. While the general backwards
64 compatibility is maintained, several changes must be noted:
70 Code references with an empty prototype are no longer treated specially.
71 They are passed an argument like the other code references (even if they
76 C<%hash ~~ sub {}> and C<@array ~~ sub {}> now test that the subroutine
77 returns a true value for each key of the hash (or element of the
78 array), instead of passing the whole hash or array as a reference to
83 Due to the commutativity breakage, code references are no longer
84 treated specially when appearing on the left of the C<~~> operator,
85 but like any vulgar scalar.
89 C<undef ~~ %hash> is always false (since C<undef> can't be a key in a
90 hash). No implicit conversion to C<""> is done (as was the case in perl
95 C<$scalar ~~ @array> now always distributes the smart match across the
96 elements of the array. It's true if one element in @array verifies
97 C<$scalar ~~ $element>. This is a generalization of the old behaviour
98 that tested whether the array contained the scalar.
102 The full dispatch table for the smart match operator is given in
103 L<perlsyn/"Smart matching in detail">.
105 =head3 Smart match and overloading
107 According to the rule of dispatch based on the rightmost argument type,
108 when an object overloading C<~~> appears on the right side of the
109 operator, the overload routine will always be called (with a 3rd argument
110 set to a true value, see L<overload>.) However, when the object will
111 appear on the left, the overload routine will be called only when the
112 rightmost argument is a simple scalar. This way distributivity of smart match
113 across arrays is not broken, as well as the other behaviours with complex
114 types (coderefs, hashes, regexes). Thus, writers of overloading routines
115 for smart match mostly need to worry only with comparing against a scalar,
116 and possibly with stringification overloading; the other common cases
117 will be automatically handled consistently.
119 C<~~> will now refuse to work on objects that do not overload it (in order
120 to avoid relying on the object's underlying structure). (However, if the
121 object overloads the stringification or the numification operators, and
122 if overload fallback is active, it will be used instead, as usual.)
124 =head2 Labels can't be keywords
126 Labels used as targets for the C<goto>, C<last>, C<next> or C<redo>
127 statements cannot be keywords anymore. This restriction will prevent
128 potential confusion between the C<goto LABEL> and C<goto EXPR> syntaxes:
129 for example, a statement like C<goto print> would jump to a label whose
130 name would be the return value of print(), (usually 1), instead of a
131 label named C<print>. Moreover, the other control flow statements
132 would just ignore any keyword passed to them as a label name. Since
133 such labels cannot be defined anymore, this kind of error will be
136 =head2 Other incompatible changes
142 The semantics of C<use feature :5.10*> have changed slightly.
143 See L<"Modules and Pragmata"> for more information.
147 It is now a run-time error to use the smart match operator C<~~>
148 with an object that has no overload defined for it. (This way
149 C<~~> will not break encapsulation by matching against the
150 object's internal representation as a reference.)
154 The version control system used for the development of the perl
155 interpreter has been switched from Perforce to git. This is mainly an
156 internal issue that only affects people actively working on the perl core;
157 but it may have minor external visibility, for example in some of details
158 of the output of C<perl -V>. See L<perlrepository> for more information.
162 The internal structure of the C<ext/> directory in the perl source has
163 been reorganised. In general, a module C<Foo::Bar> whose source was
164 stored under F<ext/Foo/Bar/> is now located under F<ext/Foo-Bar/>. Also,
165 some modules have been moved from F<lib/> to F<ext/>. This is purely a
166 source tarball change, and should make no difference to the compilation or
167 installation of perl, unless you have a very customised build process that
168 explicitly relies on this structure, or which hard-codes the C<nonxs_ext>
169 F<Configure> parameter. Specifically, this change does not by default
170 alter the location of any files in the final installation.
174 As part of the C<Test::Harness> 2.x to 3.x upgrade, the experimental
175 C<Test::Harness::Straps> module has been removed.
176 See L</"Updated Modules"> for more details.
180 As part of the C<ExtUtils::MakeMaker> upgrade, the
181 C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish> modules
182 have been removed from this distribution.
186 C<Module::CoreList> no longer contains the C<%:patchlevel> hash.
190 This one is actually a change introduced in 5.10.0, but it was missed
191 from that release's perldelta, so it is mentioned here instead.
193 A bugfix related to the handling of the C</m> modifier and C<qr> resulted
194 in a change of behaviour between 5.8.x and 5.10.0:
196 # matches in 5.8.x, doesn't match in 5.10.0
197 $re = qr/^bar/; "foo\nbar" =~ /$re/m;
201 C<length undef> now returns undef.
205 =head1 Core Enhancements
207 =head2 Unicode Character Database 5.1.0
209 The copy of the Unicode Character Database included in Perl 5.11.0 has
210 been updated to 5.1.0 from 5.0.0. See
211 L<http://www.unicode.org/versions/Unicode5.1.0/#Notable_Changes> for the
214 =head2 A proper interface for pluggable Method Resolution Orders
216 As of Perl 5.11.0 there is a new interface for plugging and using method
217 resolution orders other than the default (linear depth first search).
218 The C3 method resolution order added in 5.10.0 has been re-implemented as
219 a plugin, without changing its Perl-space interface. See L<perlmroapi> for
222 =head2 The C<overloading> pragma
224 This pragma allows you to lexically disable or enable overloading
225 for some or all operations. (Yuval Kogman)
227 =head2 C<\N> regex escape
229 A new regex escape has been added, C<\N>. It will match any character that
230 is not a newline, independently from the presence or absence of the single
231 line match modifier C</s>. (If C<\N> is followed by an opening brace and
232 by a letter, perl will still assume that a Unicode character name is
233 coming, so compatibility is preserved.) (Rafael Garcia-Suarez)
235 =head2 Implicit strictures
237 Using the C<use VERSION> syntax with a version number greater or equal
238 to 5.11.0 will also lexically enable strictures just like C<use strict>
239 would do (in addition to enabling features.) So, the following:
248 =head2 Parallel tests
250 The core distribution can now run its regression tests in parallel on
251 Unix-like platforms. Instead of running C<make test>, set C<TEST_JOBS> in
252 your environment to the number of tests to run in parallel, and run
253 C<make test_harness>. On a Bourne-like shell, this can be done as
255 TEST_JOBS=3 make test_harness # Run 3 tests in parallel
257 An environment variable is used, rather than parallel make itself, because
258 L<TAP::Harness> needs to be able to schedule individual non-conflicting test
259 scripts itself, and there is no standard interface to C<make> utilities to
260 interact with their job schedulers.
262 Note that currently some test scripts may fail when run in parallel (most
263 notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts
264 again sequentially and see if the failures go away.
266 =head2 The C<...> operator
268 A new operator, C<...>, nicknamed the Yada Yada operator, has been added.
269 It is intended to mark placeholder code, that is not yet implemented.
270 See L<perlop/"Yada Yada Operator">. (chromatic)
272 =head2 DTrace support
274 Some support for DTrace has been added. See "DTrace support" in F<INSTALL>.
276 =head2 Support for C<configure_requires> in CPAN module metadata
278 Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> keyword
279 in the C<META.yml> metadata file included in most recent CPAN distributions.
280 This allows distribution authors to specify configuration prerequisites that
281 must be installed before running F<Makefile.PL> or F<Build.PL>.
283 See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for more
284 on how to specify C<configure_requires> when creating a distribution for CPAN.
286 =head2 The C<each> function can now operate on arrays
288 =head2 Perl's core time-related functions are now Y2038 compliand
290 =head2 The variable C<$,> may now be tied
292 =head2 // now behaves like || in when clauses
294 =head2 You can now set C<-W> from the C<PERL5OPT> environment varialbe
296 =head1 Modules and Pragmata
298 =head2 New Modules and Pragmata
304 This is a new lexically-scoped alternative for the C<Fatal> module.
305 The bundled version is 2.06_01. Note that in this release, using a string
306 eval when C<autodie> is in effect can cause the autodie behaviour to leak
307 into the surrounding scope. See L<autodie/"BUGS"> for more details.
309 =item C<Compress::Raw::Bzip2>
311 This has been added to the core (version 2.020).
315 This pragma establishes an ISA relationship with base classes at compile
316 time. It provides the key feature of C<base> without the feature creep.
318 =item C<Parse::CPAN::Meta>
320 This has been added to the core (version 1.39).
324 =head2 Pragmata Changes
330 See L</"The C<overloading> pragma"> above.
334 Upgraded from version 0.08 to 0.09.
338 The C<attrs> pragma has been removed. It had been marked as deprecated since
343 Upgraded from version 2.13 to 2.14. See L<parent> for a replacement.
347 Upgraded from version 0.22 to 0.23.
351 Upgraded from version 0.22 to 0.23.
355 Upgraded from version 0.22 to 0.23.
359 Upgraded from version 1.06 to 1.07.
361 The Unicode F<NameAliases.txt> database file has been added. This has the
362 effect of adding some extra C<\N> character names that formerly wouldn't
363 have been recognised; for example, C<"\N{LATIN CAPITAL LETTER GHA}">.
367 Upgraded from version 1.13 to 1.19. Some code has been shifted from run time to
368 compile time, and the amount of MRO cache flushing has been minimised.
372 The meaning of the C<:5.10> and C<:5.10.X> feature bundles has
373 changed slightly. The last component, if any (i.e. C<X>) is simply ignored.
374 This is predicated on the assumption that new features will not, in
375 general, be added to maintenance releases. So C<:5.10> and C<:5.10.X>
376 have identical effect. This is a change to the behaviour documented for
381 Upgraded from version 2.13 to 2.14 (this was just a version bump; there
382 were no functional changes).
386 Upgraded from version 0.5565 to 0.62.
390 Upgraded from version 1.06 to 1.07.
394 Upgraded from version 1.06 to 1.07.
398 See L</"The C<overloading> pragma"> above.
402 Upgraded from version 0.74 to 0.77.
406 =head2 Updated Modules
410 =item C<Archive::Extract>
412 Upgraded from version 0.24 to 0.34.
414 =item C<Archive::Tar>
416 Upgraded from version 1.38 to 1.52.
418 =item C<Attribute::Handlers>
420 Upgraded from version 0.79 to 0.85.
424 Upgraded from version 5.63 to 5.68.
428 Upgraded from version 1.05 to 1.06.
432 Upgraded from version 1.17 to 1.22.
436 Upgraded from version 1.05 to 1.11.
440 Upgraded from version 0.83 to 0.89.
444 Upgraded from version 1.09 to 1.11.
448 Upgraded from version 1.01 to 1.02.
452 Upgraded from version 1.10 to 1.11.
456 Upgraded from version 1.08 to 1.11.
458 L<Carp> now includes all the necessary code to function. Previously, it
459 used to be a lightweight placeholder that loaded the actual code from
460 C<Carp::Heavy> on demand. C<Carp::Heavy> is now a simple, empty module
461 kept for backwards compatibility for programs that used to pre-load it.
465 Upgraded from version 3.29 to 3.43.
466 (also includes the "default_value for popup_menu()" fix from 3.45).
468 =item C<Compress::Zlib>
470 Upgraded from version 2.008 to 2.020.
474 Upgraded from version 1.9205 to 1.9402. C<CPAN::FTP> has a local fix to
475 stop it being too verbose on download failure.
479 Upgraded from version 0.84 to 0.88.
481 =item C<CPANPLUS::Dist::Build>
483 Upgraded from version 0.06_02 to 0.36.
487 Upgraded from version 3.25_01 to 3.30.
489 =item C<Data::Dumper>
491 Upgraded from version 2.121_14 to 2.124.
495 Upgraded from version 1.01 to 1.02.
499 Upgraded from version 1.816_1 to 1.820.
501 =item C<Devel::PPPort>
503 Upgraded from version 3.13 to 3.19.
507 Upgraded from version 2.36_01 to 2.39.
511 Upgraded from version 5.45 to 5.47.
515 Upgraded from version 1.01 to 1.03.
519 Upgraded from version 1.12 to 1.13.
523 Upgraded from version 1.08 to 1.10.
527 Upgraded from version 2.23 to 2.35.
531 Upgraded from version 1.10 to 1.11.
535 Upgraded from version 5.62 to 5.63.
537 =item C<ExtUtils::CBuilder>
539 Upgraded from version 0.21 to 0.2602.
541 =item C<ExtUtils::Command>
543 Upgraded from version 1.13 to 1.16.
545 =item C<ExtUtils::Constant>
547 Upgraded from 0.20 to 0.22. (Note that neither of these versions are
550 =item C<ExtUtils::Embed>
552 Upgraded from version 1.27 to 1.28.
554 =item C<ExtUtils::Install>
556 Upgraded from version 1.44 to 1.54.
558 =item C<ExtUtils::MakeMaker>
560 Upgraded from version 6.42 to 6.55_02.
562 Note that C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish>
563 have been removed from this distribution.
565 =item C<ExtUtils::Manifest>
567 Upgraded from version 1.51_01 to 1.56.
569 =item C<ExtUtils::ParseXS>
571 Upgraded from version 2.18_02 to 2.2002.
575 Upgraded from version 1.05 to 2.06_01. See also the new pragma C<autodie>.
577 =item C<File::Basename>
579 Upgraded from version 2.76 to 2.77.
581 =item C<File::Compare>
583 Upgraded from version 1.1005 to 1.1006.
587 Upgraded from version 2.11 to 2.16.
589 File::Copy now always return 0 (not "") on failure.
591 FIXME - describe C<cp>
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.
957 Upgraded from version 0.34 to 0.39.
959 =item C<Win32API::File>
961 Upgraded from version 0.1001_01 to 0.1101.
965 Upgraded from version 0.08 to 0.10.
969 =head1 Utility Changes
975 Now looks in C<include-fixed> too, which is a recent addition to gcc's
980 No longer incorrectly treats enum values like macros (Daniel Burr).
982 Now handles C++ style constants (C<//>) properly in enums. (A patch from
983 Rainer Weikusat was used; Daniel Burr also proposed a similar fix).
987 C<LVALUE> subroutines now work under the debugger.
989 The debugger now correctly handles proxy constant subroutines, and
994 F<perlbug> now uses %Module::CoreList::bug_tracker to print out upstream bug
997 Where the user names a module that their bug report is about, and we know the
998 URL for its upstream bug tracker, provide a message to the user explaining
999 that the core copies the CPAN version directly, and provide the URL for
1000 reporting the bug directly to upstream.
1004 Perl 5.11.0 added a new utility F<perlthanks>, which is a variant of
1005 F<perlbug>, but for sending non-bug-reports to the authors and maintainers
1006 of Perl. Getting nothing but bug reports can become a bit demoralising:
1007 we'll see if this changes things.
1011 =head1 New Documentation
1017 This contains instructions on how to build perl for the Haiku platform.
1021 This describes the new interface for pluggable Method Resolution Orders.
1025 This document, by Richard Foley, provides an introduction to the use of
1026 performance and optimization techniques which can be used with particular
1027 reference to perl programs.
1029 =item L<perlrepository>
1031 This describes how to access the perl source using the I<git> version
1036 This describes the new F<perlthanks> utility.
1040 =head1 Changes to Existing Documentation
1042 The various large F<Changes*> files (which listed every change made to perl
1043 over the last 18 years) have been removed, and replaced by a small file,
1044 also called F<Changes>, which just explains how that same information may
1045 be extracted from the git version control system.
1047 The file F<Porting/patching.pod> has been deleted, as it mainly described
1048 interacting with the old Perforce-based repository, which is now obsolete.
1049 Information still relevant has been moved to L<perlrepository>.
1051 L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
1052 generated at build time, rather than being shipped as part of the release.
1054 =head2 Documented -X overloading.
1056 =head2 Documented that when() treats specially most of the filetest operators
1058 =head2 Documented that DESTROY is subject to AUTOLOAD, and the related optimisations.
1060 =head2 Documented when as a syntax modifier
1062 =head2 Eliminated "Old Perl threads tutorial", which describes 5005 threads.
1064 pod/perlthrtut.pod is the same material reworked for ithreads.
1066 =head2 Removed a link to the attrs pragma, which has now been removed.
1068 =head2 update PERL_MEM_LOG in perlhack.pod
1070 =head2 Correct previous documentation: v-strings are not deprecated
1072 With version objects, we need them to use MODULE VERSION syntax. This
1073 patch removes the deprecation note.
1075 =head1 Performance Enhancements
1081 A new internal cache means that C<isa()> will often be faster.
1085 The implementation of C<C3> Method Resolution Order has been optimised -
1086 linearisation for classes with single inheritance is 40% faster. Performance
1087 for multiple inheritance is unchanged.
1091 Under C<use locale>, the locale-relevant information is now cached on
1092 read-only values, such as the list returned by C<keys %hash>. This makes
1093 operations such as C<sort keys %hash> in the scope of C<use locale> much
1098 Empty C<DESTROY> methods are no longer called.
1102 Faster sv_utf8_upgrade()
1106 Speed up keys() on empty hash
1110 =head1 Installation and Configuration Improvements
1112 =head2 F<ext/> reorganisation
1114 The layout of directories in F<ext> has been revised. Specifically, all
1115 extensions are now flat, and at the top level, with C</> in pathnames
1116 replaced by C<->, so that F<ext/Data/Dumper/> is now F<ext/Data-Dumper/>,
1117 etc. The names of the extensions as specified to F<Configure>, and as
1118 reported by C<%Config::Config> under the keys C<dynamic_ext>,
1119 C<known_extensions>, C<nonxs_ext> and C<static_ext> have not changed, and
1120 still use C</>. Hence this change will not have any affect once perl is
1121 installed. However, C<Attribute::Handlers>, C<Safe> and C<mro> have now
1122 become extensions in their own right, so if you run F<Configure> with
1123 options to specify an exact list of extensions to build, you will need to
1124 change it to account for this.
1126 For 5.11.1, it is planned that many dual-life modules will have been moved
1127 from F<lib> to F<ext>; again this will have no effect on an installed
1128 perl, but will matter if you invoke F<Configure> with a pre-canned list of
1129 extensions to build.
1131 =head2 Configuration improvements
1133 If C<vendorlib> and C<vendorarch> are the same, then they are only added to
1136 C<$Config{usedevel}> and the C-level C<PERL_USE_DEVEL> are now defined if
1137 perl is built with C<-Dusedevel>.
1139 F<Configure> will enable use of C<-fstack-protector>, to provide protection
1140 against stack-smashing attacks, if the compiler supports it.
1142 F<Configure> will now determine the correct prototypes for re-entrant
1143 functions, and for C<gconvert>, if you are using a C++ compiler rather
1146 On Unix, if you build from a tree containing a git repository, the
1147 configuration process will note the commit hash you have checked out, for
1148 display in the output of C<perl -v> and C<perl -V>. Unpushed local commits
1149 are automatically added to the list of local patches displayed by
1152 =head2 Compilation improvements
1154 As part of the flattening of F<ext>, all extensions on all platforms are
1155 built by F<make_ext.pl>. This replaces the Unix-specific
1156 F<ext/util/make_ext>, VMS-specific F<make_ext.com> and Win32-specific
1157 F<win32/buildext.pl>.
1159 =head2 Platform Specific Changes
1165 Removed F<libbsd> for AIX 5L and 6.1. Only flock() was used from F<libbsd>.
1167 Removed F<libgdbm> for AIX 5L and 6.1. The F<libgdbm> is delivered as an
1168 optional package with the AIX Toolbox. Unfortunately the 64 bit version
1171 Hints changes mean that AIX 4.2 should work again.
1175 On Cygwin we now strip the last number from the DLL. This has been the
1176 behaviour in the cygwin.com build for years. The hints files have been
1181 The hints files now identify the correct threading libraries on FreeBSD 7
1186 We now work around a bizarre preprocessor bug in the Irix 6.5 compiler:
1187 C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't.
1191 Patches from the Haiku maintainers have been merged in. Perl should now
1196 Perl should now build on MirOS BSD.
1200 Hints now supports versions 5.*.
1204 Various changes from Stratus have been merged in.
1208 There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK.
1212 Improved message window handling means that C<alarm> and C<kill> messages
1213 will no longer be dropped under race conditions.
1217 Reads from the in-memory temporary files of C<PerlIO::scalar> used to fail
1218 if C<$/> was set to a numeric reference (to indicate record-style reads).
1221 VMS now supports C<getgrgid>.
1223 Many improvements and cleanups have been made to the VMS file name handling
1224 and conversion code.
1226 Enabling the C<PERL_VMS_POSIX_EXIT> logical name now encodes a POSIX exit
1227 status in a VMS condition value for better interaction with GNV's bash
1228 shell and other utilities that depend on POSIX exit values. See
1229 L<perlvms/"$?"> for details.
1231 C<File::Copy> now detects Unix compatibility mode on VMS.
1235 =head1 Selected Bug Fixes
1241 =item C<-I> on shebang line now adds directories in front of @INC.
1242 as documented, and as does C<-I> when specified on the command-line.
1247 C<kill> is now fatal when called on non-numeric process identifiers.
1248 Previously, an 'undef' process identifier would be interpreted as a request to
1249 kill process "0", which would terminate the current process group on POSIX
1250 systems. Since process identifiers are always integers, killing a non-numeric
1251 process is now fatal.
1255 5.10.0 inadvertently disabled an optimisation, which caused a measurable
1256 performance drop in list assignment, such as is often used to assign
1257 function parameters from C<@_>. The optimisation has been re-instated, and
1258 the performance regression fixed.
1262 Fixed memory leak on C<while (1) { map 1, 1 }> [RT #53038].
1266 Some potential coredumps in PerlIO fixed [RT #57322,54828].
1270 The debugger now works with lvalue subroutines.
1274 The debugger's C<m> command was broken on modules that defined constants
1279 C<crypt()> and string complement could return tainted values for untainted
1280 arguments [RT #59998].
1284 The C<-i.suffix> command-line switch now recreates the file using
1285 restricted permissions, before changing its mode to match the original
1286 file. This eliminates a potential race condition [RT #60904].
1290 On some UNIX systems, the value in C<$?> would not have the top bit set
1291 (C<$? & 128>) even if the child core dumped.
1295 Under some circumstances, $^R could incorrectly become undefined
1300 (XS) In various hash functions, passing a pre-computed hash to when the
1301 key is UTF-8 might result in an incorrect lookup.
1305 (XS) Including F<XSUB.h> before F<perl.h> gave a compile-time error
1310 C<< $object->isa('Foo') >> would report false if the package C<Foo> didn't
1311 exist, even if the object's C<@ISA> contained C<Foo>.
1315 Various bugs in the new-to 5.10.0 mro code, triggered by manipulating
1316 C<@ISA>, have been found and fixed.
1320 Bitwise operations on references could crash the interpreter, e.g.
1321 C<$x=\$y; $x |= "foo"> [RT #54956].
1325 Patterns including alternation might be sensitive to the internal UTF-8
1326 representation, e.g.
1328 my $byte = chr(192);
1329 my $utf8 = chr(192); utf8::upgrade($utf8);
1330 $utf8 =~ /$byte|X}/i; # failed in 5.10.0
1334 Within UTF8-encoded Perl source files (i.e. where C<use utf8> is in
1335 effect), double-quoted literal strings could be corrupted where a C<\xNN>,
1336 C<\0NNN> or C<\N{}> is followed by a literal character with ordinal value
1337 greater than 255 [RT #59908].
1341 C<B::Deparse> failed to correctly deparse various constructs:
1342 C<readpipe STRING> [RT #62428], C<CORE::require(STRING)> [RT #62488],
1343 C<sub foo(_)> [RT #62484].
1347 Using C<setpgrp()> with no arguments could corrupt the perl stack.
1351 The block form of C<eval> is now specifically trappable by C<Safe> and
1352 C<ops>. Previously it was erroneously treated like string C<eval>.
1356 In 5.10.0, the two characters C<[~> were sometimes parsed as the smart
1357 match operator (C<~~>) [RT #63854].
1361 In 5.10.0, the C<*> quantifier in patterns was sometimes treated as
1362 C<{0,32767}> [RT #60034, #60464]. For example, this match would fail:
1364 ("ab" x 32768) =~ /^(ab)*$/
1368 C<shmget> was limited to a 32 bit segment size on a 64 bit OS [RT #63924].
1372 Using C<next> or C<last> to exit a C<given> block no longer produces a
1373 spurious warning like the following:
1375 Exiting given via last at foo.pl line 123
1379 On Windows, C<'.\foo'> and C<'..\foo'> were treated differently than
1380 C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492].
1384 Assigning a format to a glob could corrupt the format; e.g.:
1386 *bar=*foo{FORMAT}; # foo format now bad
1390 Attempting to coerce a typeglob to a string or number could cause an
1391 assertion failure. The correct error message is now generated,
1392 C<Can't coerce GLOB to I<$type>>.
1396 Under C<use filetest 'access'>, C<-x> was using the wrong access mode. This
1397 has been fixed [RT #49003].
1401 C<length> on a tied scalar that returned a Unicode value would not be
1402 correct the first time. This has been fixed.
1406 Using an array C<tie> inside in array C<tie> could SEGV. This has been
1411 A race condition inside C<PerlIOStdio_close()> has been identified and
1412 fixed. This used to cause various threading issues, including SEGVs.
1416 In C<unpack>, the use of C<()> groups in scalar context was internally
1417 placing a list on the interpreter's stack, which manifested in various
1418 ways, including SEGVs. This is now fixed [RT #50256].
1422 Magic was called twice in C<substr>, C<\&$x>, C<tie $x, $m> and C<chop>.
1423 These have all been fixed.
1427 A 5.10.0 optimisation to clear the temporary stack within the implicit
1428 loop of C<s///ge> has been reverted, as it turned out to be the cause of
1429 obscure bugs in seemingly unrelated parts of the interpreter [commit
1434 The line numbers for warnings inside C<elsif> are now correct.
1438 The C<..> operator now works correctly with ranges whose ends are at or
1439 close to the values of the smallest and largest integers.
1443 C<binmode STDIN, ':raw'> could lead to segmentation faults on some platforms.
1444 This has been fixed [RT #54828].
1448 An off-by-one error meant that C<index $str, ...> was effectively being
1449 executed as C<index "$str\0", ...>. This has been fixed [RT #53746].
1453 Various leaks associated with named captures in regexes have been fixed
1458 A weak reference to a hash would leak. This was affecting C<DBI>
1463 Using (?|) in a regex could cause a segfault [RT #59734].
1467 Use of a UTF-8 C<tr//> within a closure could cause a segfault [RT #61520].
1471 Calling C<sv_chop()> or otherwise upgrading an SV could result in an
1472 unaligned 64-bit access on the SPARC architecture [RT #60574].
1476 In the 5.10.0 release, C<inc_version_list> would incorrectly list
1477 C<5.10.*> after C<5.8.*>; this affected the C<@INC> search order
1482 In 5.10.0, C<pack "a*", $tainted_value> returned a non-tainted value
1487 In 5.10.0, C<printf> and C<sprintf> could produce the fatal error
1488 C<panic: utf8_mg_pos_cache_update> when printing UTF-8 strings
1493 In the 5.10.0 release, a dynamically created C<AUTOLOAD> method might be
1494 missed (method cache issue) [RT #60220,60232].
1498 In the 5.10.0 release, a combination of C<use feature> and C<//ee> could
1499 cause a memory leak [RT #63110].
1503 C<-C> on the shebang (C<#!>) line is once more permitted if it is also
1504 specified on the command line. C<-C> on the shebang line used to be a
1505 silent no-op I<if> it was not also on the command line, so perl 5.10.0
1506 disallowed it, which broke some scripts. Now perl checks whether it is
1507 also on the command line and only dies if it is not [RT #67880].
1511 In 5.10.0, certain types of re-entrant regular expression could crash,
1512 or cause the following assertion failure [RT #60508]:
1514 Assertion rx->sublen >= (s - rx->subbeg) + i failed
1518 =head1 New or Changed Diagnostics
1522 =item C<panic: sv_chop %s>
1524 This new fatal error occurs when the C routine C<Perl_sv_chop()> was
1525 passed a position that is not within the scalar's string buffer. This
1526 could be caused by buggy XS code, and at this point recovery is not
1529 =item C<Can't locate package %s for the parents of %s>
1531 This warning has been removed. In general, it only got produced in
1532 conjunction with other warnings, and removing it allowed an ISA lookup
1533 optimisation to be added.
1535 =item C<v-string in use/require is non-portable>
1537 This warning has been removed.
1539 =item C<Deep recursion on subroutine "%s">
1541 It is now possible to change the depth threshold for this warning from the
1542 default of 100, by recompiling the F<perl> binary, setting the C
1543 pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value.
1547 =head1 Changed Internals
1553 The J.R.R. Tolkien quotes at the head of C source file have been checked and
1554 proper citations added, thanks to a patch from Tom Christiansen.
1558 C<vcroak()> now accepts a null first argument. In addition, a full audit
1559 was made of the "not NULL" compiler annotations, and those for several
1560 other internal functions were corrected.
1564 New macros C<dSAVEDERRNO>, C<dSAVE_ERRNO>, C<SAVE_ERRNO>, C<RESTORE_ERRNO>
1565 have been added to formalise the temporary saving of the C<errno>
1570 The function C<Perl_sv_insert_flags> has been added to augment
1575 The function C<Perl_newSV_type(type)> has been added, equivalent to
1576 C<Perl_newSV()> followed by C<Perl_sv_upgrade(type)>.
1580 The function C<Perl_newSVpvn_flags()> has been added, equivalent to
1581 C<Perl_newSVpvn()> and then performing the action relevant to the flag.
1583 Two flag bits are currently supported.
1589 This will call C<SvUTF8_on()> for you. (Note that this does not convert an
1590 sequence of ISO 8859-1 characters to UTF-8). A wrapper, C<newSVpvn_utf8()>
1591 is available for this.
1595 Call C<sv_2mortal()> on the new SV.
1599 There is also a wrapper that takes constant strings, C<newSVpvs_flags()>.
1603 The function C<Perl_croak_xs_usage> has been added as a wrapper to
1608 The functions C<PerlIO_find_layer> and C<PerlIO_list_alloc> are now
1613 C<PL_na> has been exterminated from the core code, replaced by local STRLEN
1614 temporaries, or C<*_nolen()> calls. Either approach is faster than C<PL_na>,
1615 which is a pointer deference into the interpreter structure under ithreads,
1616 and a global variable otherwise.
1620 C<Perl_mg_free()> used to leave freed memory accessible via SvMAGIC() on
1621 the scalar. It now updates the linked list to remove each piece of magic
1626 Under ithreads, the regex in C<PL_reg_curpm> is now reference counted. This
1627 eliminates a lot of hackish workarounds to cope with it not being reference
1632 C<Perl_mg_magical()> would sometimes incorrectly turn on C<SvRMAGICAL()>.
1633 This has been fixed.
1637 The I<public> IV and NV flags are now not set if the string value has
1638 trailing "garbage". This behaviour is consistent with not setting the
1639 public IV or NV flags if the value is out of range for the type.
1643 SV allocation tracing has been added to the diagnostics enabled by C<-Dm>.
1644 The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if
1645 that was enabled when the F<perl> binary was compiled.
1649 Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have been
1650 replaced by C<NULL> in the core code, and non-dual-life modules, as C<NULL>
1651 is clearer to those unfamiliar with the core code.
1655 A macro C<MUTABLE_PTR(p)> has been added, which on (non-pedantic) gcc will
1656 not cast away C<const>, returning a C<void *>. Macros C<MUTABLE_SV(av)>,
1657 C<MUTABLE_SV(cv)> etc build on this, casting to C<AV *> etc without
1658 casting away C<const>. This allows proper compile-time auditing of
1659 C<const> correctness in the core, and helped picked up some errors (now
1664 Macros C<mPUSHs()> and C<mXPUSHs()> have been added, for pushing SVs on the
1665 stack and mortalizing them.
1669 Use of the private structure C<mro_meta> has changed slightly. Nothing
1670 outside the core should be accessing this directly anyway.
1674 A new tool, F<Porting/expand-macro.pl> has been added, that allows you
1675 to view how a C preprocessor macro would be expanded when compiled.
1676 This is handy when trying to decode the macro hell that is the perl
1683 Many modules updated from CPAN incorporate new tests.
1685 Several tests that have the potential to hang forever if they fail now
1686 incorporate a "watchdog" functionality that will kill them after a timeout,
1687 which helps ensure that C<make test> and C<make test_harness> run to
1688 completion automatically. (Jerry Hedden).
1690 Some core-specific tests have been added:
1694 =item t/comp/retainedlines.t
1696 Check that the debugger can retain source lines from C<eval>.
1698 =item t/io/perlio_fail.t
1700 Check that bad layers fail.
1702 =item t/io/perlio_leaks.t
1704 Check that PerlIO layers are not leaking.
1706 =item t/io/perlio_open.t
1708 Check that certain special forms of open work.
1712 General PerlIO tests.
1716 Check that there is no unexpected interaction between the internal types
1717 C<PVBM> and C<PVGV>.
1719 =item t/mro/package_aliases.t
1721 Check that mro works properly in the presence of aliased packages.
1725 Tests for C<dbmopen> and C<dbmclose>.
1727 =item t/op/index_thr.t
1729 Tests for the interaction of C<index> and threads.
1731 =item t/op/pat_thr.t
1733 Tests for the interaction of esoteric patterns and threads.
1737 Test that C<qr> doesn't leak.
1739 =item t/op/reg_email_thr.t
1741 Tests for the interaction of regex recursion and threads.
1743 =item t/op/regexp_qr_embed_thr.t
1745 Tests for the interaction of patterns with embedded C<qr//> and threads.
1747 =item t/op/regexp_unicode_prop.t
1749 Tests for Unicode properties in regular expressions.
1751 =item t/op/regexp_unicode_prop_thr.t
1753 Tests for the interaction of Unicode properties and threads.
1755 =item t/op/reg_nc_tie.t
1757 Test the tied methods of C<Tie::Hash::NamedCapture>.
1759 =item t/op/reg_posixcc.t
1761 Check that POSIX character classes behave consistently.
1765 Check that exportable C<re> functions in F<universal.c> work.
1767 =item t/op/setpgrpstack.t
1769 Check that C<setpgrp> works.
1771 =item t/op/substr_thr.t
1773 Tests for the interaction of C<substr> and threads.
1775 =item t/op/upgrade.t
1777 Check that upgrading and assigning scalars works.
1779 =item t/uni/lex_utf8.t
1781 Check that Unicode in the lexer works.
1785 Check that Unicode and C<tie> work.
1789 =head1 Known Problems
1791 This is a list of some significant unfixed bugs, which are regressions
1792 from either 5.10.0 or 5.8.x.
1798 C<List::Util::first> misbehaves in the presence of a lexical C<$_>
1799 (typically introduced by C<my $_> or implicitly by C<given>). The variable
1800 which gets set for each iteration is the package variable C<$_>, not the
1801 lexical C<$_> [RT #67694].
1803 A similar issue may occur in other modules that provide functions which
1804 take a block as their first argument, like
1806 foo { ... $_ ...} list
1810 The C<charnames> pragma may generate a run-time error when a regex is
1811 interpolated [RT #56444]:
1813 use charnames ':full';
1814 my $r1 = qr/\N{THAI CHARACTER SARA I}/;
1815 "foo" =~ $r1; # okay
1816 "foo" =~ /$r1+/; # runtime error
1818 A workaround is to generate the character outside of the regex:
1820 my $a = "\N{THAI CHARACTER SARA I}";
1825 Some regexes may run much more slowly when run in a child thread compared
1826 with the thread the pattern was compiled into [RT #55600].
1832 The following items are now deprecated.
1838 C<Switch> is buggy and should be avoided. From perl 5.11.0 onwards, it is
1839 intended that any use of the core version of this module will emit a
1840 warning, and that the module will eventually be removed from the core
1841 (probably in perl 5.14.0). See L<perlsyn/"Switch statements"> for its
1846 C<suidperl> has been removed. It used to provide a mechanism to
1847 emulate setuid permission bits on systems that don't support it properly.
1851 Deprecate assignment to $[
1855 Remove attrs, which has been deprecated since 1999/10/02.
1859 Deprecate use of the attribute :locked on subroutines.
1863 Deprecate using "locked" with the attributes pragma.
1867 Deprecate using "unique" with the attributes pragma.
1871 warn if ++ or -- are unable to change the value because it's beyond the limit of representation
1873 This uses a new warnings category: "imprecision".
1877 Make lc/uc/lcfirst/ucfirst warn when passed undef.
1881 Show constant in "Useless use of a constant in void context"
1885 Make the new warning report undef constants as undef
1889 Add a new warning, "Prototype after '%s'"
1893 Tweak the "Illegal character in prototype" warning so it's more precise when reporting illegal characters after _
1897 Unintented interpolation of $\ in regex
1901 Make overflow warnings in gmtime/localtime only occur when warnings are on
1905 Improve mro merging error messages.
1907 They are now very similar to those produced by Algorithm::C3.
1911 Amelioration of the error message "Unrecognized character %s in column %d"
1913 Changes the error message to "Unrecognized character %s; marked by <--
1914 HERE after %s<-- HERE near column %d". This should make it a little
1915 simpler to spot and correct the suspicious character.
1919 Explicitely point to $. when it causes an uninitialized warning for ranges in scalar context
1923 =head1 Acknowledgements
1925 Some of the work in this release was funded by a TPF grant.
1927 Nicholas Clark officially retired from maintenance pumpking duty at the
1928 end of 2008; however in reality he has put much effort in since then to
1929 help get 5.10.1 into a fit state to be released, including writing a
1930 considerable chunk of this perldelta.
1932 Steffen Mueller and David Golden in particular helped getting CPAN modules
1933 polished and synchronised with their in-core equivalents.
1935 Craig Berry was tireless in getting maint to run under VMS, no matter how
1936 many times we broke it for him.
1938 The other core committers contributed most of the changes, and applied most
1939 of the patches sent in by the hundreds of contributors listed in F<AUTHORS>.
1941 Much of the work of categorizing changes in this perldelta file was contributed
1942 by the following porters using changelogger.bestpractical.com:
1944 Nicholas Clark, leon, shawn, alexm, rjbs, rafl, Pedro Melo, brunorc,
1945 anonymous, ☄, Tom Hukins, anonymous, Jesse, dagolden, Moritz Onken,
1946 Mark Fowler, chorny, anonymous, tmtm
1948 Finally, thanks to Larry Wall, without whom none of this would be
1951 =head1 Reporting Bugs
1953 If you find what you think is a bug, you might check the articles
1954 recently posted to the comp.lang.perl.misc newsgroup and the perl
1955 bug database at http://rt.perl.org/perlbug/ . There may also be
1956 information at http://www.perl.org/ , the Perl Home Page.
1958 If you believe you have an unreported bug, please run the B<perlbug>
1959 program included with your release. Be sure to trim your bug down
1960 to a tiny but sufficient test case. Your bug report, along with the
1961 output of C<perl -V>, will be sent off to perlbug@perl.org to be
1962 analysed by the Perl porting team.
1964 If the bug you are reporting has security implications, which make it
1965 inappropriate to send to a publicly archived mailing list, then please send
1966 it to perl5-security-report@perl.org. This points to a closed subscription
1967 unarchived mailing list, which includes all the core committers, who be able
1968 to help assess the impact of issues, figure out a resolution, and help
1969 co-ordinate the release of patches to mitigate or fix the problem across all
1970 platforms on which Perl is supported. Please only use this address for
1971 security issues in the Perl core, not for modules independently
1972 distributed on CPAN.
1976 The F<Changes> file for an explanation of how to view exhaustive details
1979 The F<INSTALL> file for how to build Perl.
1981 The F<README> file for general stuff.
1983 The F<Artistic> and F<Copying> files for copyright information.
1990 The following changes are a filtered list of changes which weren't backported
1991 to 5.10.1. They were run through changelogger.bestpractical.com and triaged
1992 by a set of Perl 5 Porters. Changes to blead after 5945e41e have not yet
1993 been triaged or integrated.
1995 The following changes need to be
1997 1) deleted if they don't merit inclusion
2001 2) lightly copyedited and integrated into the perldelta above. Unfortunately, many of our
2002 commit messages are somewhat terse and require a bit more help to turn into something readable
2009 =head2 Move the reg_stringify logic to Perl_sv_2pv_flags
2011 =head2 mg_copy ought to take an I32
2013 =head2 Perl_store_cop_label() isn't meant to be part of the public API.
2015 =head2 Perl_gv_fetchmethod{,_autoload,_flags} are actually never* called with a non-NULL stash.
2016 So change the parameter to NN.
2019 =head2 Promote Perl_setdefout() to the public API.
2021 =head2 Add get_cvs() as a shortcut for STR_WITH_LEN() and Perl_get_cvn_flags()
2023 =head2 In Perl_newCONSTSUB(), sv should not be NULL.
2025 =head2 GvUNIQUE* have been defined as 0 since 2005/06/30 - high time to remove them.
2027 =head2 invert and rename PERL_MEM_LOG_STDERR to PERL_MEM_LOG_NOIMPL
2029 Most users who want PERL_MEM_LOG want the default implementation,
2030 give it to them. Users providing their own implementation can
2031 obtain current behavior by adding -DPERL_MEM_LOG_NOIMPL.
2032 Frankly, the average user probably wants _ENV by default too.
2034 =head2 simplify PERL_MEM_LOG
2036 This combines multiple environment variable reads into 1,
2037 where it looks for values like "2mst"
2038 -2 leading digits are atoi()d to get FD
2039 -m memory logging please
2041 -t timestamp those please.
2043 Combining these reduces overhead such that it seemed
2044 worthwhile to drop all the ifdefs. TBD whether this works
2045 in the environment that drove the original tradeoffs.
2047 If it isnt enough, Id be tempted by a global static ptr,
2048 and on 1st use, is read, seen 0, a lock is taken, and getenvar
2049 run to populate it, unlocked, proceed. This would remove
2050 iterative overheads.
2052 =head2 Add a parameter "destructing" to Gv_AMupdate()
2054 This boolean parameter indicates if the function has been called
2055 to update the overload magic table while looking up the DESTROY
2056 method. In this case, it's probably best to avoid croaking if
2057 those tables could not be updated (for example due to a method
2058 that could not be loaded.)
2060 =head2 Modify the return value of Gv_AMupdate to indicate a compilation error
2062 This way we'll restore most of the performance on object desctruction
2063 lost by the previous commit
2066 =head2 local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
2068 Re: [perl #60360] [PATCH] UPDATED: local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
2069 Message-ID: <20081112234504.GI2062@tytlal.topaz.cx>
2071 Updated patch to retain source compatibility.
2073 Plus using the correct PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS
2074 macro and running make regen.
2076 =head2 Respecting inc_version_list while processing PERL_VENDORLIB_STEM
2078 Respecting inc_version_list while processing PERL_VENDORLIB_STEM
2079 From: "Mandalemula, Rajesh" <Rajesh.Mandalemula@deshaw.com>
2081 =head2 Change PL_debug behaviour
2084 String eval lines are now saved whenever
2085 a subroutine is defined, even if the eval'd string has subsequent
2086 syntax errors. This allows the debugger to single step into these
2090 =head2 Tied filehandles now have an additional method EOF which provides the EOF type
2092 =head2 Perl is now smarter about adding a -I dir to the beginning or end of @INC
2094 =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.
2096 =head2 When a glob is deleted, mark its sub as ANON.
2098 =head2 Require a space or a newline after a "#line XXX" directive
2100 =head2 Forbid using "foreach" as an attribute
2102 (like all other control flow statements)
2105 =head2 Unregister signal handlers before destroying my_perl
2107 If the signal handler runs after perl_destruct() has been called, it
2108 will get an invalid (or NULL) my_perl when it asks for the
2109 thread-specific interpreter struct. This patch resets the signal
2110 handler for any signal previously handled by PL_csighandlerp to SIG_DFL
2111 before calling perl_destruct().
2113 =head2 Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
2115 Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
2116 instead of the now-removed INT handler.
2118 =head2 [perl #66452] TMPDIR not honored when opening an anonymous temporary file
2120 [perl #66452] TMPDIR not honored when opening an anonymous temporary file
2122 =head2 The attached patch to perlio.c fixes the problem of errno getting set.
2124 While I am firmly in the school of "do not look at $! except immediately
2125 after a failure", I also agree that spuriously setting it is messy. But
2126 there is just no way of knowing where your errno might have been.
2128 The problem was that PerlIO_fast_gets() (and other nearby similar
2129 capability-checking PerlIO routines) set the errno (and it was being
2130 called a lot, from sv_gets()). I think setting the errno here was
2131 a mistake: checking for "can has FOO" should not set external state,
2132 such as the errno. The patch removes that errno trashing from all those
2135 =head2 Trim all trailing / from "." in @INC when filling %INC
2137 This fixes bug #66942 : as a / was left in the directory name,
2138 $INC{"Foo.pm"} for a file loaded from the current directory
2139 was given the incorrect value "/Foo.pm".
2141 =head2 Don't enqueue pending signals during global destruction
2143 Global destruction is not signal-safe. PL_psig_pend may already
2144 be gone when the signal handler is called (with destruct_level > 0).
2145 NULL it before freeing it to prevent a race condition.
2147 =head2 Eliminate struct regexp_allocated and xpvio_allocated.
2149 Calculate memory allocation using regexp and XPVIO, and the offset of the first
2150 real structure member. This avoids tripping over alignment differences between
2151 X* and x*_allocated, because x*_allocated doesn't have a double in it.
2156 =head2 [perl #47047] Use of inherited AUTOLOAD for non-method is deprecated
2158 =head2 Remove the definitions of Null(), Nullch, Nullfp, Nullsv and PL_na when code is within the perl source tree
2160 =head2 Replace our assert-which-can-be-caught-by-eval with the real deal from the standard C library.
2162 =head2 Tweak Perl_sv_upgrade() so that references can upgrade to SVt_PV
2164 =head2 Eliminate prelen from struct regexp.
2166 =head2 Change Perl_av_iter_p() to return IV* rather than I32* (which means
2168 =head2 Reorder the external regexp flags to get RXf_PMf_STD_PMMOD into the
2170 lowest 4 bits (which saves a shift), and the "flags indicating special
2171 patterns" into contiguous bits. This makes everything a little tidier,
2172 and saves 88 bytes (woohoo!) of object file with -Os on x86 FreeBSD.
2175 =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.
2177 fit, as chopping off 1 byte gives just enough space for recording a
2178 delta of up to 127). This allows SvOOK() to co-exist with SvIOK_on(),
2179 which means all the calls to SvOOK_off() [with the possibility of a
2180 call to sv_backoff()] in SvIOK_on() can be removed. This ought to make
2181 a lot of straight line code a little bit simpler.
2182 OOK()d scalars can now be SVt_PV, as the IVX isn't needed.
2184 =head2 Abolish wraplen from struct regexp. We're already storing it in SvCUR.
2186 =head2 Make Perl_pregcomp() use SvUTF8() of the pattern, rather than the flag bit in pmflags, to decide whether the pattern is UTF-8.
2188 =head2 Abolish RXf_UTF8. Store the UTF-8-ness of the pattern with SvUTF8().
2190 =head2 In struct regexp move the member paren_names to the IV union.
2192 =head2 Make REGEXP a type distinct from SV. (Much like AV, CV, GV, HV).
2194 =head2 Allow sv_setsv_flags() to copy SVt_REGEXP much like it copies SVt_FORMAT - the just string buffer.
2197 =head2 Correct a long-standing ithreads reference counting anonamly
2199 The reference count only needs "doubling" when the scalar is pushed onto
2200 PL_regex_padav for the second time.
2203 =head2 In PL_regexp_padav, store regexps via real references, rather than hiding them within IVs.
2205 We can do this now that they are real SV pointers.
2207 =head2 With regexps stored as real RVs, we can eliminate SvREPADTMP().
2209 =head2 REGEXPs are now stored directly in PL_regex_padav, rather than indirectly via RVs.
2211 =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.
2213 =head2 Remove PM_GETRE_SAFE and PM_SETRE_SAFE as nothing uses them.
2215 =head2 Note the U8 sized space created by removing -P, and check that it is now an illegal command line flag.
2217 =head2 Pack the recycled pad offsets into an SV at PL_regex_pad[0].
2219 =head2 Re-order so that the !SvOK() case is last (which should be rare)
2221 =head2 Extend PUSHFORMAT() to take a second parameter to set retop, to save NULLing it and then reassigning.
2223 =head2 Split struct block_sub into struct block_sub and struct block_format.
2225 Split struct block_sub into struct block_sub and struct block_format.
2226 (CXt_SUB and CXt_FORMAT were using some comon members, but some members
2227 were only for one or the other.)
2229 =head2 Change the wantarray result from caller from IV to bool for the SCALAR/ARRAY case.
2231 This doesn't contradict the documentation, as there isn't any. Oops.
2234 =head2 Give G_VOID, G_SCALAR and G_ARRAY the same numeric values as OPf_WANT_VOID, OPf_WANT_SCALAR and OPf_WANT_LIST.
2237 =head2 Squeeze the context type down to 4 bits, and move the private flags to fit within the next 4 bits.
2240 =head2 In struct block change blku_type from U8 to U16, and the "spare" U8 to U16, with the lockstep changes in struct subst.
2242 struct block_sub, and instead store it in the U16 in struct block.
2245 =head2 In struct block_eval, eliminate old_in_eval and old_op_type by storing the data in blk_u16.
2248 =head2 The layout for struct block_loop under ithreads can be simplified.
2250 Instead of wedging the pad offset into a void* iterdata, and always
2251 storing PL_comppad even when it isn't used, instead do this:
2253 PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
2254 /* This is also accesible via cx->blk_loop.my_op->op_targ */
2255 PADOFFSET targoffset;
2257 and store the GV pointer in oldcompad. Pointers to pointers seems
2258 cleaner. This also allows us to eliminate the flag bit CXp_PADVAR.
2261 =head2 In XS_PerlIO_get_layers() take advantage of the implementation of
2263 In XS_PerlIO_get_layers() take advantage of the implementation of
2264 PerlIO_get_layers(), by co-opting the new SVs it creates, rather than
2268 =head2 Micro-optimise the order of the context types. [Because I can :-)]
2270 =head2 [patch] optimize OP_IS_(FILETEST|SOCKET) macros
2272 =head2 Eliminate ck_lengthconst.
2274 =head2 Chainsaw DEBUG_S out, as suggested by Vincent Pit.
2276 =head2 Unsupported private API functions are now declared "static" to prevent leakage to the public API
2278 =head2 Perl_cv_ckproto() is not part of the public API, and not used anywhere. It has been removed
2280 =head2 Remove all the 5005threads specific mutex macros, which are now vestigial.
2282 =head2 Do not honor TMPDIR for anonymous temporary files when tainting
2284 Use a default of /tmp on Unixes when TMPDIR is unset or empty, or
2285 when creation of a temporary file in it fails
2287 =head2 Add a pluggable hook in op_free()