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1=encoding utf8
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3=head1 NAME
4
5a00ee6a 5perl5110delta - what is new for perl v5.11.0
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6
7=head1 DESCRIPTION
8
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9This document describes differences between the 5.10.0 release and
10the 5.11.0 development release.
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11
12=head1 Incompatible Changes
13
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14=head2 Unicode interpretation of \w, \d, \s, and the POSIX character classes redefined.
15
16Previous versions of Perl tried to map POSIX style character class definitions onto
17Unicode property names so that patterns would "dwim" when matches were made against latin-1 or
18unicode strings. This proved to be a mistake, breaking character class negation, causing
19forward compatibility problems (as Unicode keeps updating their property definitions and adding
20new characters), and other problems.
21
22Therefore we have now defined a new set of artificial "unicode" property names which will be
23used to do unicode matching of patterns using POSIX style character classes and perl short-form
24escape character classes like \w and \d.
25
26The key change here is that \d will no longer match every digit in the unicode standard
27(there are thousands) nor will \w match every word character in the standard, instead they
28will match precisely their POSIX or Perl definition.
29
30Those needing to match based on Unicode properties can continue to do so by using the \p{} syntax
31to match whichever property they like, including the new artificial definitions.
32
33B<NOTE:> This is a backwards incompatible no-warning change in behaviour. If you are upgrading
34and you process large volumes of text look for POSIX and Perl style character classes and
35change them to the relevent property name (by removing the word 'Posix' from the current name).
36
37The following table maps the POSIX character class names, the escapes and the old and new
38Unicode property mappings:
39
40 POSIX Esc Class New-Property ! Old-Property
41 ----------------------------------------------+-------------
42 alnum [0-9A-Za-z] IsPosixAlnum ! IsAlnum
43 alpha [A-Za-z] IsPosixAlpha ! IsAlpha
44 ascii [\000-\177] IsASCII = IsASCII
45 blank [\011 ] IsPosixBlank !
46 cntrl [\0-\37\177] IsPosixCntrl ! IsCntrl
47 digit \d [0-9] IsPosixDigit ! IsDigit
48 graph [!-~] IsPosixGraph ! IsGraph
49 lower [a-z] IsPosixLower ! IsLower
50 print [ -~] IsPosixPrint ! IsPrint
51 punct [!-/:-@[-`{-~] IsPosixPunct ! IsPunct
52 space [\11-\15 ] IsPosixSpace ! IsSpace
53 \s [\11\12\14\15 ] IsPerlSpace ! IsSpacePerl
54 upper [A-Z] IsPosixUpper ! IsUpper
55 word \w [0-9A-Z_a-z] IsPerlWord ! IsWord
56 xdigit [0-9A-Fa-f] IsXDigit = IsXDigit
57
58If you wish to build perl with the old mapping you may do so by setting
59
60 #define PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS 1
61
62in regcomp.h, and then setting
63
64 PERL_TEST_LEGACY_POSIX_CC
65
66to true your enviornment when testing.
67
68
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69=head2 In @INC, move ARCHLIB and PRIVLIB after the current version's site_perl and vendor_perl.
70
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71=head2 Switch statement changes
72
73The handling of complex expressions by the C<given>/C<when> switch
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74statement has been enhanced. These enhancements are also available in
755.10.1 and subsequent 5.10 releases. There are two new cases where C<when> now
412304fb 76interprets its argument as a boolean, instead of an expression to be used
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77in a smart match:
78
79=over 4
80
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81=item flip-flop operators
82
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83The C<..> and C<...> flip-flop operators are now evaluated in boolean
84context, following their usual semantics; see L<perlop/"Range Operators">.
85
86Note that, as in perl 5.10.0, C<when (1..10)> will not work to test
87whether a given value is an integer between 1 and 10; you should use
88C<when ([1..10])> instead (note the array reference).
89
90However, contrary to 5.10.0, evaluating the flip-flop operators in boolean
91context ensures it can now be useful in a C<when()>, notably for
92implementing bistable conditions, like in:
93
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94 when (/^=begin/ .. /^=end/) {
95 # do something
96 }
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97
98=item defined-or operator
99
100A compound expression involving the defined-or operator, as in
101C<when (expr1 // expr2)>, will be treated as boolean if the first
102expression is boolean. (This just extends the existing rule that applies
103to the regular or operator, as in C<when (expr1 || expr2)>.)
104
105=back
106
98814a2b 107The next section details more changes brought to the semantics to
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108the smart match operator, that naturally also modify the behaviour
109of the switch statements where smart matching is implicitly used.
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110These changers were also made for the 5.10.1 release, and will remain in
111subsequent 5.10 releases.
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112
113=head2 Smart match changes
114
115=head3 Changes to type-based dispatch
116
117The smart match operator C<~~> is no longer commutative. The behaviour of
118a smart match now depends primarily on the type of its right hand
5a00ee6a 119argument. Moreover, its semantics have been adjusted for greater
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120consistency or usefulness in several cases. While the general backwards
121compatibility is maintained, several changes must be noted:
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122
123=over 4
124
125=item *
126
127Code references with an empty prototype are no longer treated specially.
128They are passed an argument like the other code references (even if they
129choose to ignore it).
130
131=item *
132
133C<%hash ~~ sub {}> and C<@array ~~ sub {}> now test that the subroutine
9091a618 134returns a true value for each key of the hash (or element of the
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135array), instead of passing the whole hash or array as a reference to
136the subroutine.
137
138=item *
139
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140Due to the commutativity breakage, code references are no longer
141treated specially when appearing on the left of the C<~~> operator,
142but like any vulgar scalar.
143
144=item *
145
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146C<undef ~~ %hash> is always false (since C<undef> can't be a key in a
147hash). No implicit conversion to C<""> is done (as was the case in perl
1485.10.0).
149
150=item *
151
152C<$scalar ~~ @array> now always distributes the smart match across the
153elements of the array. It's true if one element in @array verifies
154C<$scalar ~~ $element>. This is a generalization of the old behaviour
155that tested whether the array contained the scalar.
156
157=back
158
159The full dispatch table for the smart match operator is given in
160L<perlsyn/"Smart matching in detail">.
161
162=head3 Smart match and overloading
163
164According to the rule of dispatch based on the rightmost argument type,
165when an object overloading C<~~> appears on the right side of the
166operator, the overload routine will always be called (with a 3rd argument
167set to a true value, see L<overload>.) However, when the object will
168appear on the left, the overload routine will be called only when the
9091a618 169rightmost argument is a simple scalar. This way distributivity of smart match
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170across arrays is not broken, as well as the other behaviours with complex
171types (coderefs, hashes, regexes). Thus, writers of overloading routines
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172for smart match mostly need to worry only with comparing against a scalar,
173and possibly with stringification overloading; the other common cases
174will be automatically handled consistently.
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175
176C<~~> will now refuse to work on objects that do not overload it (in order
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177to avoid relying on the object's underlying structure). (However, if the
178object overloads the stringification or the numification operators, and
179if overload fallback is active, it will be used instead, as usual.)
8b8da387 180
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181=head2 Labels can't be keywords
182
183Labels used as targets for the C<goto>, C<last>, C<next> or C<redo>
184statements cannot be keywords anymore. This restriction will prevent
185potential confusion between the C<goto LABEL> and C<goto EXPR> syntaxes:
186for example, a statement like C<goto print> would jump to a label whose
7a4b5c08 187name would be the return value of C<print()>, (usually 1), instead of a
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188label named C<print>. Moreover, the other control flow statements
189would just ignore any keyword passed to them as a label name. Since
190such labels cannot be defined anymore, this kind of error will be
191avoided.
192
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193=head2 Other incompatible changes
194
195=over 4
196
197=item *
198
199The semantics of C<use feature :5.10*> have changed slightly.
200See L<"Modules and Pragmata"> for more information.
201
202=item *
203
204It is now a run-time error to use the smart match operator C<~~>
205with an object that has no overload defined for it. (This way
206C<~~> will not break encapsulation by matching against the
207object's internal representation as a reference.)
208
209=item *
210
211The version control system used for the development of the perl
212interpreter has been switched from Perforce to git. This is mainly an
213internal issue that only affects people actively working on the perl core;
214but it may have minor external visibility, for example in some of details
215of the output of C<perl -V>. See L<perlrepository> for more information.
216
217=item *
218
219The internal structure of the C<ext/> directory in the perl source has
220been reorganised. In general, a module C<Foo::Bar> whose source was
221stored under F<ext/Foo/Bar/> is now located under F<ext/Foo-Bar/>. Also,
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222nearly all dual-life modules have been moved from F<lib/> to F<ext/>. This
223is purely a source tarball change, and should make no difference to the
224compilation or installation of perl, unless you have a very customised build
225process that explicitly relies on this structure, or which hard-codes the
226C<nonxs_ext> F<Configure> parameter. Specifically, this change does not by
227default alter the location of any files in the final installation.
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228
229=item *
230
231As part of the C<Test::Harness> 2.x to 3.x upgrade, the experimental
232C<Test::Harness::Straps> module has been removed.
233See L</"Updated Modules"> for more details.
234
235=item *
236
237As part of the C<ExtUtils::MakeMaker> upgrade, the
238C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish> modules
239have been removed from this distribution.
240
241=item *
242
243C<Module::CoreList> no longer contains the C<%:patchlevel> hash.
244
245=item *
246
247This one is actually a change introduced in 5.10.0, but it was missed
248from that release's perldelta, so it is mentioned here instead.
249
250A bugfix related to the handling of the C</m> modifier and C<qr> resulted
251in a change of behaviour between 5.8.x and 5.10.0:
252
253 # matches in 5.8.x, doesn't match in 5.10.0
254 $re = qr/^bar/; "foo\nbar" =~ /$re/m;
255
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256=item *
257
258C<length undef> now returns undef.
259
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260=back
261
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262=head1 Core Enhancements
263
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264=head2 Unicode Character Database 5.1.0
265
3141b5e1 266The copy of the Unicode Character Database included in Perl 5.11.0 has
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267been updated to 5.1.0 from 5.0.0. See
268L<http://www.unicode.org/versions/Unicode5.1.0/#Notable_Changes> for the
269notable changes.
270
271=head2 A proper interface for pluggable Method Resolution Orders
272
3141b5e1 273As of Perl 5.11.0 there is a new interface for plugging and using method
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274resolution orders other than the default (linear depth first search).
275The C3 method resolution order added in 5.10.0 has been re-implemented as
276a plugin, without changing its Perl-space interface. See L<perlmroapi> for
277more information.
278
ef55af2a 279=head2 The C<overloading> pragma
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280
281This pragma allows you to lexically disable or enable overloading
282for some or all operations. (Yuval Kogman)
283
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284=head2 C<\N> regex escape
285
286A new regex escape has been added, C<\N>. It will match any character that
287is not a newline, independently from the presence or absence of the single
288line match modifier C</s>. (If C<\N> is followed by an opening brace and
289by a letter, perl will still assume that a Unicode character name is
290coming, so compatibility is preserved.) (Rafael Garcia-Suarez)
291
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292=head2 Implicit strictures
293
294Using the C<use VERSION> syntax with a version number greater or equal
295to 5.11.0 will also lexically enable strictures just like C<use strict>
296would do (in addition to enabling features.) So, the following:
297
298 use 5.11.0;
299
300will now imply:
301
302 use strict;
303 use feature ':5.11';
304
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305=head2 Parallel tests
306
307The core distribution can now run its regression tests in parallel on
308Unix-like platforms. Instead of running C<make test>, set C<TEST_JOBS> in
309your environment to the number of tests to run in parallel, and run
310C<make test_harness>. On a Bourne-like shell, this can be done as
311
312 TEST_JOBS=3 make test_harness # Run 3 tests in parallel
313
314An environment variable is used, rather than parallel make itself, because
315L<TAP::Harness> needs to be able to schedule individual non-conflicting test
316scripts itself, and there is no standard interface to C<make> utilities to
317interact with their job schedulers.
318
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319Note that currently some test scripts may fail when run in parallel (most
320notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts
321again sequentially and see if the failures go away.
322
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323=head2 The C<...> operator
324
325A new operator, C<...>, nicknamed the Yada Yada operator, has been added.
326It is intended to mark placeholder code, that is not yet implemented.
327See L<perlop/"Yada Yada Operator">. (chromatic)
328
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329=head2 DTrace support
330
331Some support for DTrace has been added. See "DTrace support" in F<INSTALL>.
332
333=head2 Support for C<configure_requires> in CPAN module metadata
334
335Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> keyword
038a5866 336in the F<META.yml> metadata file included in most recent CPAN distributions.
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337This allows distribution authors to specify configuration prerequisites that
338must be installed before running F<Makefile.PL> or F<Build.PL>.
339
340See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for more
341on how to specify C<configure_requires> when creating a distribution for CPAN.
342
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343=head2 The C<each> function can now operate on arrays
344
345=head2 Perl's core time-related functions are now Y2038 compliand
346
347=head2 The variable C<$,> may now be tied
348
349=head2 // now behaves like || in when clauses
350
351=head2 You can now set C<-W> from the C<PERL5OPT> environment varialbe
352
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353=head1 Modules and Pragmata
354
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355=head2 New Modules and Pragmata
356
357=over 4
358
359=item C<autodie>
360
361This is a new lexically-scoped alternative for the C<Fatal> module.
362The bundled version is 2.06_01. Note that in this release, using a string
363eval when C<autodie> is in effect can cause the autodie behaviour to leak
364into the surrounding scope. See L<autodie/"BUGS"> for more details.
365
366=item C<Compress::Raw::Bzip2>
367
368This has been added to the core (version 2.020).
369
370=item C<parent>
371
372This pragma establishes an ISA relationship with base classes at compile
373time. It provides the key feature of C<base> without the feature creep.
374
375=item C<Parse::CPAN::Meta>
376
377This has been added to the core (version 1.39).
378
379=back
380
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381=head2 Pragmata Changes
382
383=over 4
384
385=item C<overloading>
386
387See L</"The C<overloading> pragma"> above.
388
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389=item C<attributes>
390
391Upgraded from version 0.08 to 0.09.
392
393=item C<attrs>
394
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395The C<attrs> pragma has been removed. It had been marked as deprecated since
3965.6.0.
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397
398=item C<base>
399
400Upgraded from version 2.13 to 2.14. See L<parent> for a replacement.
401
402=item C<bigint>
403
404Upgraded from version 0.22 to 0.23.
405
406=item C<bignum>
407
408Upgraded from version 0.22 to 0.23.
409
410=item C<bigrat>
411
412Upgraded from version 0.22 to 0.23.
413
414=item C<charnames>
415
416Upgraded from version 1.06 to 1.07.
417
418The Unicode F<NameAliases.txt> database file has been added. This has the
419effect of adding some extra C<\N> character names that formerly wouldn't
420have been recognised; for example, C<"\N{LATIN CAPITAL LETTER GHA}">.
421
422=item C<constant>
423
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424Upgraded from version 1.13 to 1.19. Some code has been shifted from run time to
425compile time, and the amount of MRO cache flushing has been minimised.
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426
427=item C<feature>
428
429The meaning of the C<:5.10> and C<:5.10.X> feature bundles has
430changed slightly. The last component, if any (i.e. C<X>) is simply ignored.
431This is predicated on the assumption that new features will not, in
432general, be added to maintenance releases. So C<:5.10> and C<:5.10.X>
433have identical effect. This is a change to the behaviour documented for
4345.10.0.
435
436=item C<fields>
437
438Upgraded from version 2.13 to 2.14 (this was just a version bump; there
439were no functional changes).
440
441=item C<lib>
442
443Upgraded from version 0.5565 to 0.62.
444
445=item C<open>
446
447Upgraded from version 1.06 to 1.07.
448
449=item C<overload>
450
451Upgraded from version 1.06 to 1.07.
452
453=item C<overloading>
454
455See L</"The C<overloading> pragma"> above.
456
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457=item C<mro>
458
459Upgraded from version 1.00 to 1.01. Performance for single inheritance is 40%
460faster - see L</"Performance Enhancements"> below.
461
462C<mro> is now implemented as an XS extension. The documented interface has not
463changed. Code relying on the implementation detail that some C<mro::>
464methods happened to be available at all times gets to "keep both pieces".
465
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466=item C<version>
467
468Upgraded from version 0.74 to 0.77.
469
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470=back
471
5a00ee6a 472=head2 Updated Modules
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473
474=over 4
475
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476=item C<Archive::Extract>
477
478Upgraded from version 0.24 to 0.34.
479
480=item C<Archive::Tar>
481
482Upgraded from version 1.38 to 1.52.
483
484=item C<Attribute::Handlers>
485
486Upgraded from version 0.79 to 0.85.
487
488=item C<AutoLoader>
489
490Upgraded from version 5.63 to 5.68.
491
492=item C<AutoSplit>
493
494Upgraded from version 1.05 to 1.06.
495
496=item C<B>
497
498Upgraded from version 1.17 to 1.22.
499
500=item C<B::Debug>
501
502Upgraded from version 1.05 to 1.11.
503
504=item C<B::Deparse>
505
506Upgraded from version 0.83 to 0.89.
507
508=item C<B::Lint>
509
510Upgraded from version 1.09 to 1.11.
511
512=item C<B::Xref>
513
514Upgraded from version 1.01 to 1.02.
515
516=item C<Benchmark>
517
518Upgraded from version 1.10 to 1.11.
519
520=item C<Carp>
521
522Upgraded from version 1.08 to 1.11.
523
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524L<Carp> now includes all the necessary code to function. Previously, it
525used to be a lightweight placeholder that loaded the actual code from
526C<Carp::Heavy> on demand. C<Carp::Heavy> is now a simple, empty module
527kept for backwards compatibility for programs that used to pre-load it.
528
5a00ee6a 529=item C<CGI>
7120b314 530
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531Upgraded from version 3.29 to 3.43.
532(also includes the "default_value for popup_menu()" fix from 3.45).
7120b314 533
5a00ee6a 534=item C<Compress::Zlib>
7120b314 535
5a00ee6a 536Upgraded from version 2.008 to 2.020.
7120b314 537
5a00ee6a 538=item C<CPAN>
7120b314 539
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540Upgraded from version 1.9205 to 1.9402. C<CPAN::FTP> has a local fix to
541stop it being too verbose on download failure.
54ad55c5 542
5a00ee6a 543=item C<CPANPLUS>
54ad55c5 544
5a00ee6a 545Upgraded from version 0.84 to 0.88.
54ad55c5 546
5a00ee6a 547=item C<CPANPLUS::Dist::Build>
e2c0f81f 548
5a00ee6a 549Upgraded from version 0.06_02 to 0.36.
e2c0f81f 550
5a00ee6a 551=item C<Cwd>
fc46f0f6 552
5a00ee6a 553Upgraded from version 3.25_01 to 3.30.
fc46f0f6 554
5a00ee6a 555=item C<Data::Dumper>
54ad55c5 556
5a00ee6a 557Upgraded from version 2.121_14 to 2.124.
7120b314 558
5a00ee6a 559=item C<DB>
7120b314 560
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561Upgraded from version 1.01 to 1.02.
562
563=item C<DB_File>
564
565Upgraded from version 1.816_1 to 1.820.
566
567=item C<Devel::PPPort>
568
569Upgraded from version 3.13 to 3.19.
570
571=item C<Digest::MD5>
572
573Upgraded from version 2.36_01 to 2.39.
574
575=item C<Digest::SHA>
576
577Upgraded from version 5.45 to 5.47.
578
579=item C<DirHandle>
580
581Upgraded from version 1.01 to 1.03.
582
583=item C<Dumpvalue>
584
585Upgraded from version 1.12 to 1.13.
586
587=item C<DynaLoader>
588
589Upgraded from version 1.08 to 1.10.
590
591=item C<Encode>
592
593Upgraded from version 2.23 to 2.35.
594
595=item C<Errno>
596
597Upgraded from version 1.10 to 1.11.
598
599=item C<Exporter>
600
601Upgraded from version 5.62 to 5.63.
602
603=item C<ExtUtils::CBuilder>
604
605Upgraded from version 0.21 to 0.2602.
606
607=item C<ExtUtils::Command>
608
609Upgraded from version 1.13 to 1.16.
610
611=item C<ExtUtils::Constant>
612
613Upgraded from 0.20 to 0.22. (Note that neither of these versions are
614available on CPAN.)
615
616=item C<ExtUtils::Embed>
617
618Upgraded from version 1.27 to 1.28.
619
620=item C<ExtUtils::Install>
621
622Upgraded from version 1.44 to 1.54.
623
624=item C<ExtUtils::MakeMaker>
625
626Upgraded from version 6.42 to 6.55_02.
627
628Note that C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish>
629have been removed from this distribution.
630
631=item C<ExtUtils::Manifest>
632
633Upgraded from version 1.51_01 to 1.56.
634
635=item C<ExtUtils::ParseXS>
636
637Upgraded from version 2.18_02 to 2.2002.
638
639=item C<Fatal>
640
641Upgraded from version 1.05 to 2.06_01. See also the new pragma C<autodie>.
642
643=item C<File::Basename>
644
645Upgraded from version 2.76 to 2.77.
646
647=item C<File::Compare>
648
649Upgraded from version 1.1005 to 1.1006.
650
651=item C<File::Copy>
652
0de885a9 653Upgraded from version 2.11 to 2.16.
5a00ee6a 654
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655File::Copy now always return 0 (not "") on failure.
656
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657FIXME - describe C<cp>
658
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659=item C<File::Fetch>
660
661Upgraded from version 0.14 to 0.20.
662
663=item C<File::Find>
664
665Upgraded from version 1.12 to 1.14.
666
667=item C<File::Path>
668
669Upgraded from version 2.04 to 2.07_03.
670
671=item C<File::Spec>
672
673Upgraded from version 3.2501 to 3.30.
674
675=item C<File::stat>
676
677Upgraded from version 1.00 to 1.01.
678
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679Added -X overloading, -M, -C and -A.
680
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681=item C<File::Temp>
682
683Upgraded from version 0.18 to 0.22.
684
685=item C<FileCache>
686
687Upgraded from version 1.07 to 1.08.
688
689=item C<FileHandle>
690
691Upgraded from version 2.01 to 2.02.
692
693=item C<Filter::Simple>
694
695Upgraded from version 0.82 to 0.84.
696
697=item C<Filter::Util::Call>
698
699Upgraded from version 1.07 to 1.08.
700
701=item C<FindBin>
702
703Upgraded from version 1.49 to 1.50.
704
705=item C<GDBM_File>
706
707Upgraded from version 1.08 to 1.09.
708
709=item C<Getopt::Long>
710
711Upgraded from version 2.37 to 2.38.
712
713=item C<Hash::Util::FieldHash>
714
715Upgraded from version 1.03 to 1.04. This fixes a memory leak.
716
717=item C<I18N::Collate>
718
719Upgraded from version 1.00 to 1.01.
720
721=item C<IO>
722
723Upgraded from version 1.23_01 to 1.25.
724
725This makes non-blocking mode work on Windows in C<IO::Socket::INET>
726[CPAN #43573].
727
728=item C<IO::Compress::*>
729
730Upgraded from version 2.008 to 2.020.
731
732=item C<IO::Dir>
733
734Upgraded from version 1.06 to 1.07.
735
736=item C<IO::Handle>
737
738Upgraded from version 1.27 to 1.28.
739
740=item C<IO::Socket>
741
742Upgraded from version 1.30_01 to 1.31.
743
744=item C<IO::Zlib>
745
746Upgraded from version 1.07 to 1.09.
747
748=item C<IPC::Cmd>
749
750Upgraded from version 0.40_1 to 0.46.
751
752=item C<IPC::Open3>
753
754Upgraded from version 1.02 to 1.04.
755
756=item C<IPC::SysV>
757
758Upgraded from version 1.05 to 2.01.
759
760=item C<lib>
761
762Upgraded from version 0.5565 to 0.62.
763
764=item C<List::Util>
765
766Upgraded from version 1.19 to 1.21.
767
768=item C<Locale::MakeText>
769
770Upgraded from version 1.12 to 1.13.
771
772=item C<Log::Message>
773
774Upgraded from version 0.01 to 0.02.
775
776=item C<Math::BigFloat>
777
778Upgraded from version 1.59 to 1.60.
779
780=item C<Math::BigInt>
781
782Upgraded from version 1.88 to 1.89.
783
784=item C<Math::BigInt::FastCalc>
785
786Upgraded from version 0.16 to 0.19.
787
788=item C<Math::BigRat>
789
790Upgraded from version 0.21 to 0.22.
791
792=item C<Math::Complex>
793
794Upgraded from version 1.37 to 1.56.
795
796=item C<Math::Trig>
797
798Upgraded from version 1.04 to 1.20.
799
800=item C<Memoize>
801
802Upgraded from version 1.01_02 to 1.01_03 (just a minor documentation
803change).
804
805=item C<Module::Build>
806
807Upgraded from version 0.2808_01 to 0.34_02.
808
809=item C<Module::CoreList>
810
811Upgraded from version 2.13 to 2.18. This release no longer contains the
812C<%Module::CoreList::patchlevel> hash.
813
814=item C<Module::Load>
815
816Upgraded from version 0.12 to 0.16.
817
818=item C<Module::Load::Conditional>
819
820Upgraded from version 0.22 to 0.30.
821
822=item C<Module::Loaded>
823
824Upgraded from version 0.01 to 0.02.
825
826=item C<Module::Pluggable>
827
828Upgraded from version 3.6 to 3.9.
829
830=item C<NDBM_File>
831
832Upgraded from version 1.07 to 1.08.
833
834=item C<Net::Ping>
835
836Upgraded from version 2.33 to 2.36.
837
838=item C<NEXT>
839
840Upgraded from version 0.60_01 to 0.64.
841
842=item C<Object::Accessor>
843
844Upgraded from version 0.32 to 0.34.
845
846=item C<OS2::REXX>
847
848Upgraded from version 1.03 to 1.04.
849
850=item C<Package::Constants>
851
852Upgraded from version 0.01 to 0.02.
853
854=item C<PerlIO>
855
856Upgraded from version 1.04 to 1.06.
857
858=item C<PerlIO::via>
859
860Upgraded from version 0.04 to 0.07.
861
862=item C<Pod::Man>
863
864Upgraded from version 2.16 to 2.22.
865
866=item C<Pod::Parser>
867
868Upgraded from version 1.35 to 1.37.
869
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870=item C<Pod::Plainer>
871
872Upgraded from version 0.01 to 1.00.
873
874There are no code changes - the version bump is because C<Pod::Plainer> has
875been released to CPAN as a stand alone distribution, and will be removed from
876the core distribution in 5.14.
877
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878=item Pod::Perldoc
879
880Upgrade from version 3.14_02 to 3.15.
881
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882=item C<Pod::Simple>
883
884Upgraded from version 3.05 to 3.07.
885
886=item C<Pod::Text>
887
888Upgraded from version 3.08 to 3.13.
889
890=item C<POSIX>
891
892Upgraded from version 1.13 to 1.17.
893
894=item C<Safe>
895
896Upgraded from 2.12 to 2.18.
897
898=item C<Scalar::Util>
899
900Upgraded from version 1.19 to 1.21.
901
902=item C<SelectSaver>
903
904Upgraded from 1.01 to 1.02.
905
906=item C<SelfLoader>
907
908Upgraded from 1.11 to 1.17.
909
910=item C<Socket>
911
61f1d76c
RGS
912Upgraded from 1.80 to 1.84.
913
914As of 1.84, C<Socket> can now handle abstract namespace sockets on Linux.
915(see unix(7)).
5a00ee6a
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916
917=item C<Storable>
918
919Upgraded from 2.18 to 2.20.
920
921=item C<Switch>
922
923Upgraded from version 2.13 to 2.14. Please see L</Deprecations>.
924
925=item C<Symbol>
926
927Upgraded from version 1.06 to 1.07.
928
929=item C<Sys::Syslog>
930
931Upgraded from version 0.22 to 0.27.
932
933=item C<Term::ANSIColor>
934
ad1d1c50 935Upgraded from version 1.12 to 2.01.
5a00ee6a
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936
937=item C<Term::ReadLine>
938
939Upgraded from version 1.03 to 1.04.
940
941=item C<Term::UI>
942
943Upgraded from version 0.18 to 0.20.
944
945=item C<Test::Harness>
946
947Upgraded from version 2.64 to 3.17.
948
949Note that one side-effect of the 2.x to 3.x upgrade is that the
950experimental C<Test::Harness::Straps> module (and its supporting
951C<Assert>, C<Iterator>, C<Point> and C<Results> modules) have been
952removed. If you still need this, then they are available in the
953(unmaintained) C<Test-Harness-Straps> distribution on CPAN.
954
955=item C<Test::Simple>
956
957Upgraded from version 0.72 to 0.92.
958
959=item C<Text::ParseWords>
960
961Upgraded from version 3.26 to 3.27.
962
963=item C<Text::Tabs>
964
965Upgraded from version 2007.1117 to 2009.0305.
966
967=item C<Text::Wrap>
968
969Upgraded from version 2006.1117 to 2009.0305.
970
971=item C<Thread::Queue>
972
973Upgraded from version 2.00 to 2.11.
974
975=item C<Thread::Semaphore>
976
977Upgraded from version 2.01 to 2.09.
978
979=item C<threads>
980
ad1d1c50 981Upgraded from version 1.67 to 1.73.
5a00ee6a
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982
983=item C<threads::shared>
984
985Upgraded from version 1.14 to 1.29.
986
987=item C<Tie::RefHash>
988
989Upgraded from version 1.37 to 1.38.
990
991=item C<Tie::StdHandle>
992
993This has documentation changes, and has been assigned a version for the
994first time: version 4.2.
995
996=item C<Time::HiRes>
997
998Upgraded from version 1.9711 to 1.9719.
999
1000=item C<Time::Local>
1001
1002Upgraded from version 1.18 to 1.1901.
1003
1004=item C<Time::Piece>
1005
1006Upgraded from version 1.12 to 1.15.
1007
1008=item C<Unicode::Normalize>
1009
1010Upgraded from version 1.02 to 1.03.
1011
1012=item C<Unicode::UCD>
1013
1014Upgraded from version 0.25 to 0.27.
1015
1016C<charinfo()> now works on Unified CJK code points added to later versions
1017of Unicode.
1018
1019C<casefold()> has new fields returned to provide both a simpler interface
1020and previously missing information. The old fields are retained for
1021backwards compatibility. Information about Turkic-specific code points is
1022now returned.
1023
1024The documentation has been corrected and expanded.
1025
1026=item C<UNIVERSAL>
1027
1028Upgraded from version 1.04 to 1.05.
1029
eeab323f 1030C<< UNIVERSAL->import() >> is now deprecated.
ad1d1c50 1031
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1032=item C<Win32>
1033
1034Upgraded from version 0.34 to 0.39.
1035
1036=item C<Win32API::File>
1037
1038Upgraded from version 0.1001_01 to 0.1101.
1039
1040=item C<XSLoader>
1041
1042Upgraded from version 0.08 to 0.10.
1043
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JV
1044=item Upgrade to Class::ISA 0.34
1045
1046=item Upgrade to Attribute::Handlers 0.87
1047
1048=item Upgrade to AutoLoader 5.70
1049
1050=item Upgrade to IO::Zlib 1.10
1051
1052=item Update parent to CPAN version 0.223
1053
1054=item Update Log::Message::Simple to CPAN version 0.06
1055
1056=item Updated Math::BigRat to CPAN version 0.24
1057
1058=item Update Archive::Tar to CPAN version 1.54
1059
1060=item Update IPC::Cmd to CPAN version 0.50
1061
1062=item Updated CPANPLUS::Dist::Build to CPAN version 0.40
1063
1064=item Updated Module::Loaded to CPAN version 0.06
1065
1066=item Upgrade Term::ANSIColor to 2.02
1067
1068=item Update Text::Balanced to 2.02
1069
1070=item Update Module::Build to 0.35
1071
1072=item constant has been upgraded to 1.19.
1073
1074=item upgrade CGI from 3.43 to 3.45
1075
1076=item bump Safe version to 2.18
1077
1078=item Upgrade to threads::shared 1.31
1079
1080=item Update threads to 1.74
1081
1082=item autodie 2.06_01
1083
1084=item Synchronize with CPAN's Attribute::Handlers 0.86
1085
1086=item Synchronize AutoLoader with CPAN's 5.69
1087
1088=item ExtUtils::MakeMaker 6.55_02
1089
1090=item Final release of version-0.77 for inclusion in 5.10.1
1091
1092=item Upgrade to Encode 2.37
1093
5a00ee6a
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1094=back
1095
1096=head1 Utility Changes
1097
1098=over 4
1099
1100=item F<h2ph>
1101
1102Now looks in C<include-fixed> too, which is a recent addition to gcc's
1103search path.
1104
1105=item F<h2xs>
1106
1107No longer incorrectly treats enum values like macros (Daniel Burr).
1108
1109Now handles C++ style constants (C<//>) properly in enums. (A patch from
1110Rainer Weikusat was used; Daniel Burr also proposed a similar fix).
1111
1112=item F<perl5db.pl>
1113
1114C<LVALUE> subroutines now work under the debugger.
1115
1116The debugger now correctly handles proxy constant subroutines, and
1117subroutine stubs.
1118
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1119=item F<perlbug>
1120
038a5866 1121F<perlbug> now uses C<%Module::CoreList::bug_tracker> to print out upstream bug
76e3c4a8 1122tracker URLs.
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1123
1124Where the user names a module that their bug report is about, and we know the
1125URL for its upstream bug tracker, provide a message to the user explaining
1126that the core copies the CPAN version directly, and provide the URL for
1127reporting the bug directly to upstream.
1128
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1129=item F<perlthanks>
1130
3141b5e1 1131Perl 5.11.0 added a new utility F<perlthanks>, which is a variant of
5a00ee6a
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1132F<perlbug>, but for sending non-bug-reports to the authors and maintainers
1133of Perl. Getting nothing but bug reports can become a bit demoralising:
1134we'll see if this changes things.
1135
1136=back
1137
1138=head1 New Documentation
1139
1140=over 4
1141
1142=item L<perlhaiku>
1143
1144This contains instructions on how to build perl for the Haiku platform.
1145
1146=item L<perlmroapi>
1147
1148This describes the new interface for pluggable Method Resolution Orders.
1149
1150=item L<perlperf>
1151
1152This document, by Richard Foley, provides an introduction to the use of
1153performance and optimization techniques which can be used with particular
1154reference to perl programs.
1155
1156=item L<perlrepository>
1157
1158This describes how to access the perl source using the I<git> version
1159control system.
1160
1161=item L<perlthanks>
1162
1163This describes the new F<perlthanks> utility.
1164
1165=back
1166
1167=head1 Changes to Existing Documentation
1168
76e3c4a8 1169The various large F<Changes*> files (which listed every change made to perl
5a00ee6a 1170over the last 18 years) have been removed, and replaced by a small file,
76e3c4a8 1171also called F<Changes>, which just explains how that same information may
5a00ee6a
JV
1172be extracted from the git version control system.
1173
1174The file F<Porting/patching.pod> has been deleted, as it mainly described
1175interacting with the old Perforce-based repository, which is now obsolete.
1176Information still relevant has been moved to L<perlrepository>.
1177
1178L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
1179generated at build time, rather than being shipped as part of the release.
1180
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1181=head2 Documented -X overloading.
1182
7a4b5c08 1183=head2 Documented that C<when()> treats specially most of the filetest operators
ad1d1c50 1184
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1185=head2 Documented when as a syntax modifier
1186
1187=head2 Eliminated "Old Perl threads tutorial", which describes 5005 threads.
1188
1189pod/perlthrtut.pod is the same material reworked for ithreads.
1190
ad1d1c50
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1191=head2 Correct previous documentation: v-strings are not deprecated
1192
1193With version objects, we need them to use MODULE VERSION syntax. This
1194patch removes the deprecation note.
1195
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1196=head1 Performance Enhancements
1197
1198=over 4
1199
1200=item *
1201
1202A new internal cache means that C<isa()> will often be faster.
1203
1204=item *
1205
6f54462f
NC
1206The implementation of C<C3> Method Resolution Order has been optimised -
1207linearisation for classes with single inheritance is 40% faster. Performance
1208for multiple inheritance is unchanged.
1209
1210=item *
1211
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1212Under C<use locale>, the locale-relevant information is now cached on
1213read-only values, such as the list returned by C<keys %hash>. This makes
1214operations such as C<sort keys %hash> in the scope of C<use locale> much
1215faster.
1216
1217=item *
1218
1219Empty C<DESTROY> methods are no longer called.
1220
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1221=item *
1222
7a4b5c08 1223Faster C<Perl_sv_utf8_upgrade()>
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1224
1225=item *
1226
7a4b5c08 1227Speed up C<keys> on empty hash
ad1d1c50 1228
5a00ee6a
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1229=back
1230
1231=head1 Installation and Configuration Improvements
1232
1233=head2 F<ext/> reorganisation
1234
1235The layout of directories in F<ext> has been revised. Specifically, all
1236extensions are now flat, and at the top level, with C</> in pathnames
1237replaced by C<->, so that F<ext/Data/Dumper/> is now F<ext/Data-Dumper/>,
1238etc. The names of the extensions as specified to F<Configure>, and as
1239reported by C<%Config::Config> under the keys C<dynamic_ext>,
1240C<known_extensions>, C<nonxs_ext> and C<static_ext> have not changed, and
1241still use C</>. Hence this change will not have any affect once perl is
429ee0aa
NC
1242installed. C<Safe> has been split out from being part of C<Opcode>, and
1243C<mro> is now an extension in its own right.
1244
1245Nearly all dual-life modules have been moved from F<lib> to F<ext>, and will
1246now appear as known C<nonxs_ext>. This will made no difference to the
1247structure of an installed perl, nor will the modules installed differ,
1248unless you run F<Configure> with options to specify an exact list of
1249extensions to build. In this case, you will rapidly become aware that you
1250need to add to your list, because various modules needed to complete the
1251build, such as C<ExtUtils::ParseXS>, have now become extensions, and
1252without them the build will fail well before it attempts to run the
1253regression tests.
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1254
1255=head2 Configuration improvements
1256
1257If C<vendorlib> and C<vendorarch> are the same, then they are only added to
1258C<@INC> once.
1259
1260C<$Config{usedevel}> and the C-level C<PERL_USE_DEVEL> are now defined if
1261perl is built with C<-Dusedevel>.
1262
1263F<Configure> will enable use of C<-fstack-protector>, to provide protection
1264against stack-smashing attacks, if the compiler supports it.
1265
1266F<Configure> will now determine the correct prototypes for re-entrant
1267functions, and for C<gconvert>, if you are using a C++ compiler rather
1268than a C compiler.
1269
1270On Unix, if you build from a tree containing a git repository, the
1271configuration process will note the commit hash you have checked out, for
1272display in the output of C<perl -v> and C<perl -V>. Unpushed local commits
1273are automatically added to the list of local patches displayed by
1274C<perl -V>.
1275
1276=head2 Compilation improvements
1277
1278As part of the flattening of F<ext>, all extensions on all platforms are
1279built by F<make_ext.pl>. This replaces the Unix-specific
1280F<ext/util/make_ext>, VMS-specific F<make_ext.com> and Win32-specific
1281F<win32/buildext.pl>.
1282
1283=head2 Platform Specific Changes
1284
1285=over 4
1286
1287=item AIX
1288
7a4b5c08 1289Removed F<libbsd> for AIX 5L and 6.1. Only C<flock()> was used from F<libbsd>.
5a00ee6a
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1290
1291Removed F<libgdbm> for AIX 5L and 6.1. The F<libgdbm> is delivered as an
1292optional package with the AIX Toolbox. Unfortunately the 64 bit version
1293is broken.
1294
1295Hints changes mean that AIX 4.2 should work again.
1296
1297=item Cygwin
1298
1299On Cygwin we now strip the last number from the DLL. This has been the
1300behaviour in the cygwin.com build for years. The hints files have been
1301updated.
1302
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1303=item DomainOS
1304
1305Support for Apollo DomainOS was removed in Perl 5.11.0
1306
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1307=item FreeBSD
1308
1309The hints files now identify the correct threading libraries on FreeBSD 7
1310and later.
1311
1312=item Irix
1313
1314We now work around a bizarre preprocessor bug in the Irix 6.5 compiler:
1315C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't.
1316
1317=item Haiku
1318
1319Patches from the Haiku maintainers have been merged in. Perl should now
1320build on Haiku.
1321
81afb674
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1322=item MiNT
1323
1324Support for Atari MiNT was removed in Perl 5.11.0.
1325
5a00ee6a
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1326=item MirOS BSD
1327
1328Perl should now build on MirOS BSD.
1329
1330=item NetBSD
1331
1332Hints now supports versions 5.*.
1333
1334=item Stratus VOS
1335
1336Various changes from Stratus have been merged in.
1337
1338=item Symbian
1339
1340There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK.
1341
1342=item Win32
1343
1344Improved message window handling means that C<alarm> and C<kill> messages
1345will no longer be dropped under race conditions.
1346
1347=item VMS
1348
1349Reads from the in-memory temporary files of C<PerlIO::scalar> used to fail
1350if C<$/> was set to a numeric reference (to indicate record-style reads).
1351This is now fixed.
1352
1353VMS now supports C<getgrgid>.
1354
1355Many improvements and cleanups have been made to the VMS file name handling
1356and conversion code.
1357
1358Enabling the C<PERL_VMS_POSIX_EXIT> logical name now encodes a POSIX exit
1359status in a VMS condition value for better interaction with GNV's bash
1360shell and other utilities that depend on POSIX exit values. See
1361L<perlvms/"$?"> for details.
1362
76e3c4a8 1363C<File::Copy> now detects Unix compatibility mode on VMS.
ad1d1c50 1364
5a00ee6a
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1365=back
1366
1367=head1 Selected Bug Fixes
1368
1369=over 4
1370
038a5866 1371=item *
5a00ee6a 1372
038a5866 1373C<-I> on shebang line now adds directories in front of @INC.
5a00ee6a
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1374as documented, and as does C<-I> when specified on the command-line.
1375(Renée Bäcker)
1376
76e3c4a8 1377=item *
5a00ee6a 1378
76e3c4a8 1379C<kill> is now fatal when called on non-numeric process identifiers.
5a00ee6a
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1380Previously, an 'undef' process identifier would be interpreted as a request to
1381kill process "0", which would terminate the current process group on POSIX
1382systems. Since process identifiers are always integers, killing a non-numeric
1383process is now fatal.
1384
1385=item *
1386
13875.10.0 inadvertently disabled an optimisation, which caused a measurable
1388performance drop in list assignment, such as is often used to assign
1389function parameters from C<@_>. The optimisation has been re-instated, and
1390the performance regression fixed.
1391
1392=item *
1393
1394Fixed memory leak on C<while (1) { map 1, 1 }> [RT #53038].
1395
1396=item *
1397
1398Some potential coredumps in PerlIO fixed [RT #57322,54828].
1399
1400=item *
1401
1402The debugger now works with lvalue subroutines.
1403
1404=item *
1405
1406The debugger's C<m> command was broken on modules that defined constants
1407[RT #61222].
1408
1409=item *
1410
7a4b5c08 1411C<crypt> and string complement could return tainted values for untainted
5a00ee6a
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1412arguments [RT #59998].
1413
1414=item *
1415
038a5866 1416The C<-i>I<.suffix> command-line switch now recreates the file using
5a00ee6a
JV
1417restricted permissions, before changing its mode to match the original
1418file. This eliminates a potential race condition [RT #60904].
1419
1420=item *
1421
1422On some UNIX systems, the value in C<$?> would not have the top bit set
1423(C<$? & 128>) even if the child core dumped.
1424
1425=item *
1426
038a5866 1427Under some circumstances, C<$^R> could incorrectly become undefined
5a00ee6a
JV
1428[RT #57042].
1429
1430=item *
1431
a048364f
NC
1432In the XS API, various hash functions, when passed a pre-computed hash where
1433the key is UTF-8, might result in an incorrect lookup.
5a00ee6a
JV
1434
1435=item *
1436
a048364f 1437XS code including F<XSUB.h> before F<perl.h> gave a compile-time error
5a00ee6a
JV
1438[RT #57176].
1439
1440=item *
1441
1442C<< $object->isa('Foo') >> would report false if the package C<Foo> didn't
1443exist, even if the object's C<@ISA> contained C<Foo>.
1444
1445=item *
1446
1447Various bugs in the new-to 5.10.0 mro code, triggered by manipulating
1448C<@ISA>, have been found and fixed.
1449
1450=item *
1451
1452Bitwise operations on references could crash the interpreter, e.g.
1453C<$x=\$y; $x |= "foo"> [RT #54956].
1454
1455=item *
1456
1457Patterns including alternation might be sensitive to the internal UTF-8
1458representation, e.g.
1459
1460 my $byte = chr(192);
1461 my $utf8 = chr(192); utf8::upgrade($utf8);
1462 $utf8 =~ /$byte|X}/i; # failed in 5.10.0
1463
1464=item *
1465
1466Within UTF8-encoded Perl source files (i.e. where C<use utf8> is in
1467effect), double-quoted literal strings could be corrupted where a C<\xNN>,
1468C<\0NNN> or C<\N{}> is followed by a literal character with ordinal value
1469greater than 255 [RT #59908].
1470
1471=item *
1472
1473C<B::Deparse> failed to correctly deparse various constructs:
1474C<readpipe STRING> [RT #62428], C<CORE::require(STRING)> [RT #62488],
1475C<sub foo(_)> [RT #62484].
1476
1477=item *
1478
7a4b5c08 1479Using C<setpgrp> with no arguments could corrupt the perl stack.
5a00ee6a
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1480
1481=item *
1482
1483The block form of C<eval> is now specifically trappable by C<Safe> and
1484C<ops>. Previously it was erroneously treated like string C<eval>.
1485
1486=item *
1487
1488In 5.10.0, the two characters C<[~> were sometimes parsed as the smart
1489match operator (C<~~>) [RT #63854].
1490
1491=item *
1492
1493In 5.10.0, the C<*> quantifier in patterns was sometimes treated as
1494C<{0,32767}> [RT #60034, #60464]. For example, this match would fail:
1495
1496 ("ab" x 32768) =~ /^(ab)*$/
1497
1498=item *
1499
1500C<shmget> was limited to a 32 bit segment size on a 64 bit OS [RT #63924].
1501
1502=item *
1503
1504Using C<next> or C<last> to exit a C<given> block no longer produces a
1505spurious warning like the following:
1506
1507 Exiting given via last at foo.pl line 123
1508
1509=item *
1510
1511On Windows, C<'.\foo'> and C<'..\foo'> were treated differently than
1512C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492].
1513
1514=item *
1515
1516Assigning a format to a glob could corrupt the format; e.g.:
1517
1518 *bar=*foo{FORMAT}; # foo format now bad
1519
1520=item *
1521
1522Attempting to coerce a typeglob to a string or number could cause an
1523assertion failure. The correct error message is now generated,
1524C<Can't coerce GLOB to I<$type>>.
1525
1526=item *
1527
1528Under C<use filetest 'access'>, C<-x> was using the wrong access mode. This
1529has been fixed [RT #49003].
1530
1531=item *
1532
1533C<length> on a tied scalar that returned a Unicode value would not be
1534correct the first time. This has been fixed.
1535
1536=item *
1537
1538Using an array C<tie> inside in array C<tie> could SEGV. This has been
1539fixed. [RT #51636]
1540
1541=item *
1542
1543A race condition inside C<PerlIOStdio_close()> has been identified and
1544fixed. This used to cause various threading issues, including SEGVs.
1545
1546=item *
1547
1548In C<unpack>, the use of C<()> groups in scalar context was internally
1549placing a list on the interpreter's stack, which manifested in various
1550ways, including SEGVs. This is now fixed [RT #50256].
1551
1552=item *
1553
1554Magic was called twice in C<substr>, C<\&$x>, C<tie $x, $m> and C<chop>.
1555These have all been fixed.
1556
1557=item *
1558
1559A 5.10.0 optimisation to clear the temporary stack within the implicit
1560loop of C<s///ge> has been reverted, as it turned out to be the cause of
1561obscure bugs in seemingly unrelated parts of the interpreter [commit
1562ef0d4e17921ee3de].
1563
1564=item *
1565
1566The line numbers for warnings inside C<elsif> are now correct.
1567
1568=item *
1569
1570The C<..> operator now works correctly with ranges whose ends are at or
1571close to the values of the smallest and largest integers.
1572
1573=item *
1574
1575C<binmode STDIN, ':raw'> could lead to segmentation faults on some platforms.
1576This has been fixed [RT #54828].
1577
1578=item *
1579
1580An off-by-one error meant that C<index $str, ...> was effectively being
1581executed as C<index "$str\0", ...>. This has been fixed [RT #53746].
1582
1583=item *
1584
1585Various leaks associated with named captures in regexes have been fixed
1586[RT #57024].
1587
1588=item *
1589
1590A weak reference to a hash would leak. This was affecting C<DBI>
1591[RT #56908].
1592
1593=item *
1594
1595Using (?|) in a regex could cause a segfault [RT #59734].
1596
1597=item *
1598
1599Use of a UTF-8 C<tr//> within a closure could cause a segfault [RT #61520].
1600
1601=item *
1602
7a4b5c08 1603Calling C<Perl_sv_chop()> or otherwise upgrading an SV could result in an
5a00ee6a
JV
1604unaligned 64-bit access on the SPARC architecture [RT #60574].
1605
1606=item *
1607
1608In the 5.10.0 release, C<inc_version_list> would incorrectly list
1609C<5.10.*> after C<5.8.*>; this affected the C<@INC> search order
1610[RT #67628].
1611
1612=item *
1613
1614In 5.10.0, C<pack "a*", $tainted_value> returned a non-tainted value
1615[RT #52552].
1616
1617=item *
1618
1619In 5.10.0, C<printf> and C<sprintf> could produce the fatal error
1620C<panic: utf8_mg_pos_cache_update> when printing UTF-8 strings
1621[RT #62666].
1622
1623=item *
1624
1625In the 5.10.0 release, a dynamically created C<AUTOLOAD> method might be
1626missed (method cache issue) [RT #60220,60232].
1627
1628=item *
1629
1630In the 5.10.0 release, a combination of C<use feature> and C<//ee> could
1631cause a memory leak [RT #63110].
1632
1633=item *
1634
1635C<-C> on the shebang (C<#!>) line is once more permitted if it is also
1636specified on the command line. C<-C> on the shebang line used to be a
1637silent no-op I<if> it was not also on the command line, so perl 5.10.0
1638disallowed it, which broke some scripts. Now perl checks whether it is
1639also on the command line and only dies if it is not [RT #67880].
1640
1641=item *
1642
1643In 5.10.0, certain types of re-entrant regular expression could crash,
1644or cause the following assertion failure [RT #60508]:
1645
1646 Assertion rx->sublen >= (s - rx->subbeg) + i failed
1647
5a00ee6a
JV
1648=back
1649
1650=head1 New or Changed Diagnostics
1651
1652=over 4
1653
1654=item C<panic: sv_chop %s>
1655
1656This new fatal error occurs when the C routine C<Perl_sv_chop()> was
1657passed a position that is not within the scalar's string buffer. This
1658could be caused by buggy XS code, and at this point recovery is not
1659possible.
1660
1661=item C<Can't locate package %s for the parents of %s>
1662
1663This warning has been removed. In general, it only got produced in
1664conjunction with other warnings, and removing it allowed an ISA lookup
1665optimisation to be added.
1666
1667=item C<v-string in use/require is non-portable>
1668
1669This warning has been removed.
1670
1671=item C<Deep recursion on subroutine "%s">
1672
1673It is now possible to change the depth threshold for this warning from the
1674default of 100, by recompiling the F<perl> binary, setting the C
1675pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value.
1676
1677=back
1678
1679=head1 Changed Internals
1680
1681=over 4
1682
1683=item *
1684
1685The J.R.R. Tolkien quotes at the head of C source file have been checked and
1686proper citations added, thanks to a patch from Tom Christiansen.
1687
1688=item *
1689
7a4b5c08 1690C<Perl_vcroak()> now accepts a null first argument. In addition, a full audit
5a00ee6a
JV
1691was made of the "not NULL" compiler annotations, and those for several
1692other internal functions were corrected.
1693
1694=item *
1695
1696New macros C<dSAVEDERRNO>, C<dSAVE_ERRNO>, C<SAVE_ERRNO>, C<RESTORE_ERRNO>
1697have been added to formalise the temporary saving of the C<errno>
1698variable.
1699
1700=item *
1701
1702The function C<Perl_sv_insert_flags> has been added to augment
1703C<Perl_sv_insert>.
1704
1705=item *
1706
1707The function C<Perl_newSV_type(type)> has been added, equivalent to
1708C<Perl_newSV()> followed by C<Perl_sv_upgrade(type)>.
1709
1710=item *
1711
1712The function C<Perl_newSVpvn_flags()> has been added, equivalent to
1713C<Perl_newSVpvn()> and then performing the action relevant to the flag.
1714
1715Two flag bits are currently supported.
1716
1717=over 4
1718
1719=item C<SVf_UTF8>
1720
1721This will call C<SvUTF8_on()> for you. (Note that this does not convert an
1722sequence of ISO 8859-1 characters to UTF-8). A wrapper, C<newSVpvn_utf8()>
1723is available for this.
1724
1725=item C<SVs_TEMP>
1726
7a4b5c08 1727Call C<Perl_sv_2mortal()> on the new SV.
5a00ee6a
JV
1728
1729=back
1730
1731There is also a wrapper that takes constant strings, C<newSVpvs_flags()>.
1732
1733=item *
1734
1735The function C<Perl_croak_xs_usage> has been added as a wrapper to
1736C<Perl_croak>.
1737
1738=item *
1739
1740The functions C<PerlIO_find_layer> and C<PerlIO_list_alloc> are now
1741exported.
1742
1743=item *
1744
1745C<PL_na> has been exterminated from the core code, replaced by local STRLEN
1746temporaries, or C<*_nolen()> calls. Either approach is faster than C<PL_na>,
1747which is a pointer deference into the interpreter structure under ithreads,
1748and a global variable otherwise.
1749
1750=item *
1751
7a4b5c08 1752C<Perl_mg_free()> used to leave freed memory accessible via C<SvMAGIC()> on
5a00ee6a
JV
1753the scalar. It now updates the linked list to remove each piece of magic
1754as it is freed.
1755
1756=item *
1757
1758Under ithreads, the regex in C<PL_reg_curpm> is now reference counted. This
1759eliminates a lot of hackish workarounds to cope with it not being reference
1760counted.
1761
1762=item *
1763
1764C<Perl_mg_magical()> would sometimes incorrectly turn on C<SvRMAGICAL()>.
1765This has been fixed.
1766
1767=item *
1768
1769The I<public> IV and NV flags are now not set if the string value has
1770trailing "garbage". This behaviour is consistent with not setting the
1771public IV or NV flags if the value is out of range for the type.
1772
1773=item *
1774
1775SV allocation tracing has been added to the diagnostics enabled by C<-Dm>.
1776The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if
1777that was enabled when the F<perl> binary was compiled.
1778
1779=item *
1780
d7ea0f56
JV
1781Smartmatch resolution tracing has been added as a new diagnostic. Use C<-DM> to
1782enable it.
1783
1784=item *
1785
5a00ee6a
JV
1786Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have been
1787replaced by C<NULL> in the core code, and non-dual-life modules, as C<NULL>
1788is clearer to those unfamiliar with the core code.
1789
1790=item *
1791
1792A macro C<MUTABLE_PTR(p)> has been added, which on (non-pedantic) gcc will
1793not cast away C<const>, returning a C<void *>. Macros C<MUTABLE_SV(av)>,
1794C<MUTABLE_SV(cv)> etc build on this, casting to C<AV *> etc without
1795casting away C<const>. This allows proper compile-time auditing of
1796C<const> correctness in the core, and helped picked up some errors (now
1797fixed).
1798
1799=item *
1800
1801Macros C<mPUSHs()> and C<mXPUSHs()> have been added, for pushing SVs on the
1802stack and mortalizing them.
1803
1804=item *
1805
1806Use of the private structure C<mro_meta> has changed slightly. Nothing
1807outside the core should be accessing this directly anyway.
1808
1809=item *
1810
76e3c4a8 1811A new tool, F<Porting/expand-macro.pl> has been added, that allows you
5a00ee6a
JV
1812to view how a C preprocessor macro would be expanded when compiled.
1813This is handy when trying to decode the macro hell that is the perl
1814guts.
1815
1816=back
1817
1818=head1 New Tests
1819
1820Many modules updated from CPAN incorporate new tests.
1821
1822Several tests that have the potential to hang forever if they fail now
1823incorporate a "watchdog" functionality that will kill them after a timeout,
1824which helps ensure that C<make test> and C<make test_harness> run to
1825completion automatically. (Jerry Hedden).
1826
1827Some core-specific tests have been added:
1828
1829=over 4
1830
1831=item t/comp/retainedlines.t
1832
1833Check that the debugger can retain source lines from C<eval>.
1834
1835=item t/io/perlio_fail.t
1836
1837Check that bad layers fail.
1838
1839=item t/io/perlio_leaks.t
1840
1841Check that PerlIO layers are not leaking.
1842
1843=item t/io/perlio_open.t
1844
1845Check that certain special forms of open work.
1846
1847=item t/io/perlio.t
1848
1849General PerlIO tests.
1850
1851=item t/io/pvbm.t
1852
1853Check that there is no unexpected interaction between the internal types
1854C<PVBM> and C<PVGV>.
1855
1856=item t/mro/package_aliases.t
1857
1858Check that mro works properly in the presence of aliased packages.
1859
1860=item t/op/dbm.t
1861
1862Tests for C<dbmopen> and C<dbmclose>.
1863
1864=item t/op/index_thr.t
1865
1866Tests for the interaction of C<index> and threads.
1867
1868=item t/op/pat_thr.t
1869
1870Tests for the interaction of esoteric patterns and threads.
1871
1872=item t/op/qr_gc.t
1873
1874Test that C<qr> doesn't leak.
1875
1876=item t/op/reg_email_thr.t
1877
1878Tests for the interaction of regex recursion and threads.
1879
1880=item t/op/regexp_qr_embed_thr.t
1881
1882Tests for the interaction of patterns with embedded C<qr//> and threads.
1883
1884=item t/op/regexp_unicode_prop.t
1885
1886Tests for Unicode properties in regular expressions.
1887
1888=item t/op/regexp_unicode_prop_thr.t
1889
1890Tests for the interaction of Unicode properties and threads.
1891
1892=item t/op/reg_nc_tie.t
1893
1894Test the tied methods of C<Tie::Hash::NamedCapture>.
1895
eeab323f 1896=item t/op/reg_posixcc.t
5a00ee6a
JV
1897
1898Check that POSIX character classes behave consistently.
1899
1900=item t/op/re.t
1901
1902Check that exportable C<re> functions in F<universal.c> work.
1903
1904=item t/op/setpgrpstack.t
1905
1906Check that C<setpgrp> works.
1907
1908=item t/op/substr_thr.t
1909
1910Tests for the interaction of C<substr> and threads.
1911
1912=item t/op/upgrade.t
1913
1914Check that upgrading and assigning scalars works.
1915
1916=item t/uni/lex_utf8.t
1917
1918Check that Unicode in the lexer works.
1919
1920=item t/uni/tie.t
1921
1922Check that Unicode and C<tie> work.
1923
1924=back
1925
1926=head1 Known Problems
1927
1928This is a list of some significant unfixed bugs, which are regressions
1929from either 5.10.0 or 5.8.x.
1930
1931=over 4
1932
1933=item *
1934
1935C<List::Util::first> misbehaves in the presence of a lexical C<$_>
1936(typically introduced by C<my $_> or implicitly by C<given>). The variable
1937which gets set for each iteration is the package variable C<$_>, not the
1938lexical C<$_> [RT #67694].
1939
1940A similar issue may occur in other modules that provide functions which
1941take a block as their first argument, like
1942
1943 foo { ... $_ ...} list
1944
1945=item *
1946
1947The C<charnames> pragma may generate a run-time error when a regex is
1948interpolated [RT #56444]:
1949
1950 use charnames ':full';
1951 my $r1 = qr/\N{THAI CHARACTER SARA I}/;
1952 "foo" =~ $r1; # okay
1953 "foo" =~ /$r1+/; # runtime error
1954
1955A workaround is to generate the character outside of the regex:
1956
1957 my $a = "\N{THAI CHARACTER SARA I}";
1958 my $r1 = qr/$a/;
1959
1960=item *
1961
1962Some regexes may run much more slowly when run in a child thread compared
1963with the thread the pattern was compiled into [RT #55600].
1964
5a00ee6a
JV
1965=back
1966
1967=head1 Deprecations
1968
1969The following items are now deprecated.
1970
1971=over 4
1972
1973=item *
1974
1975C<Switch> is buggy and should be avoided. From perl 5.11.0 onwards, it is
1976intended that any use of the core version of this module will emit a
1977warning, and that the module will eventually be removed from the core
1978(probably in perl 5.14.0). See L<perlsyn/"Switch statements"> for its
1979replacement.
1980
1981=item *
1982
0f97ff05
NC
1983The following modules will be removed from the core distribution in a future
1984release, and should be installed from CPAN instead. Distributions on CPAN
1985which require these should add them to their prerequisites. The core versions
1986of these modules warnings will issue a deprecation warning.
1987
1988=over
1989
1990=item *
1991
1992C<Pod::Plainer>
1993
1994=back
1995
1996=item *
1997
ad1d1c50 1998C<suidperl> has been removed. It used to provide a mechanism to
5a00ee6a
JV
1999emulate setuid permission bits on systems that don't support it properly.
2000
ad1d1c50
JV
2001=item *
2002
2003Deprecate assignment to $[
2004
2005=item *
2006
2007Remove attrs, which has been deprecated since 1999/10/02.
2008
2009=item *
2010
2011Deprecate use of the attribute :locked on subroutines.
2012
2013=item *
2014
2015Deprecate using "locked" with the attributes pragma.
2016
2017=item *
2018
2019Deprecate using "unique" with the attributes pragma.
2020
2021=item *
2022
2023warn if ++ or -- are unable to change the value because it's beyond the limit of representation
2024
2025This uses a new warnings category: "imprecision".
2026
ad1d1c50
JV
2027=item *
2028
2029Make lc/uc/lcfirst/ucfirst warn when passed undef.
2030
2031=item *
2032
2033Show constant in "Useless use of a constant in void context"
2034
2035=item *
2036
2037Make the new warning report undef constants as undef
2038
2039=item *
2040
2041Add a new warning, "Prototype after '%s'"
2042
2043=item *
2044
2045Tweak the "Illegal character in prototype" warning so it's more precise when reporting illegal characters after _
2046
2047=item *
2048
2049Unintented interpolation of $\ in regex
2050
2051=item *
2052
2053Make overflow warnings in gmtime/localtime only occur when warnings are on
2054
2055=item *
2056
2057Improve mro merging error messages.
2058
2059They are now very similar to those produced by Algorithm::C3.
2060
2061=item *
2062
2063Amelioration of the error message "Unrecognized character %s in column %d"
2064
2065Changes the error message to "Unrecognized character %s; marked by <--
2066HERE after %s<-- HERE near column %d". This should make it a little
2067simpler to spot and correct the suspicious character.
2068
2069=item *
2070
2071Explicitely point to $. when it causes an uninitialized warning for ranges in scalar context
2072
d7ea0f56
JV
2073=item *
2074
2075Removed vestigal support for Tenon Intersystems MachTen Unix layer for MacOS Classic.
2076
2077=item *
2078
2079Removed the port to Atari MiNT. It's a dead platform that hasn't had any love since 5.005.
2080
2081
2082=item *
2083
2084Deprecated numerous Perl 4-era libraries:
2085
2086F<termcap.pl>, F<tainted.pl>, F<stat.pl>, F<shellwords.pl>, F<pwd.pl>,
2087F<open3.pl>, F<open2.pl>, F<newgetopt.pl>, F<look.pl>, F<find.pl>,
2088F<finddepth.pl>, F<importenv.pl>, F<hostname.pl>, F<getopts.pl>,
2089F<getopt.pl>, F<getcwd.pl>, F<flush.pl>, F<fastcwd.pl>, F<exceptions.pl>,
2090F<ctime.pl>, F<complete.pl>, F<cacheout.pl>, F<bigrat.pl>, F<bigint.pl>,
2091F<bigfloat.pl>, F<assert.pl>, F<abbrev.pl>, F<dotsh.pl>, and
2092F<timelocal.pl> are all now deprecated. Using them will incur a warning.
2093
5a00ee6a
JV
2094=back
2095
2096=head1 Acknowledgements
2097
0cd7f36e
NC
2098Some of the work in this release was funded by a TPF grant funded by
2099Dijkmat BV, The Netherlands.
5a00ee6a
JV
2100
2101Steffen Mueller and David Golden in particular helped getting CPAN modules
2102polished and synchronised with their in-core equivalents.
2103
2104Craig Berry was tireless in getting maint to run under VMS, no matter how
2105many times we broke it for him.
2106
2107The other core committers contributed most of the changes, and applied most
2108of the patches sent in by the hundreds of contributors listed in F<AUTHORS>.
7120b314 2109
ad1d1c50
JV
2110Much of the work of categorizing changes in this perldelta file was contributed
2111by the following porters using changelogger.bestpractical.com:
2112
2113Nicholas Clark, leon, shawn, alexm, rjbs, rafl, Pedro Melo, brunorc,
2114anonymous, ☄, Tom Hukins, anonymous, Jesse, dagolden, Moritz Onken,
2115Mark Fowler, chorny, anonymous, tmtm
2116
5a00ee6a
JV
2117Finally, thanks to Larry Wall, without whom none of this would be
2118necessary.
7120b314
NC
2119
2120=head1 Reporting Bugs
2121
2122If you find what you think is a bug, you might check the articles
2123recently posted to the comp.lang.perl.misc newsgroup and the perl
5a00ee6a 2124bug database at http://rt.perl.org/perlbug/ . There may also be
7120b314
NC
2125information at http://www.perl.org/ , the Perl Home Page.
2126
2127If you believe you have an unreported bug, please run the B<perlbug>
2128program included with your release. Be sure to trim your bug down
2129to a tiny but sufficient test case. Your bug report, along with the
2130output of C<perl -V>, will be sent off to perlbug@perl.org to be
2131analysed by the Perl porting team.
2132
49f8307e
NC
2133If the bug you are reporting has security implications, which make it
2134inappropriate to send to a publicly archived mailing list, then please send
2135it to perl5-security-report@perl.org. This points to a closed subscription
2136unarchived mailing list, which includes all the core committers, who be able
2137to help assess the impact of issues, figure out a resolution, and help
2138co-ordinate the release of patches to mitigate or fix the problem across all
5a00ee6a
JV
2139platforms on which Perl is supported. Please only use this address for
2140security issues in the Perl core, not for modules independently
2141distributed on CPAN.
49f8307e 2142
7120b314
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2143=head1 SEE ALSO
2144
5a00ee6a
JV
2145The F<Changes> file for an explanation of how to view exhaustive details
2146on what changed.
7120b314
NC
2147
2148The F<INSTALL> file for how to build Perl.
2149
2150The F<README> file for general stuff.
2151
2152The F<Artistic> and F<Copying> files for copyright information.
2153
2154=cut
ad1d1c50
JV
2155
2156
2157=head1 TODO
2158
2159The following changes are a filtered list of changes which weren't backported
2160to 5.10.1. They were run through changelogger.bestpractical.com and triaged
cf8a5c47
JV
2161by a set of Perl 5 Porters. Changes to blead after
2162fafe5ad5a7e57ca14cd0844db173f3a4d6c9e8de
2163
2164have not yet been triaged or integrated.
ad1d1c50
JV
2165
2166The following changes need to be
2167
21681) deleted if they don't merit inclusion
2169
2170 OR
2171
21722) lightly copyedited and integrated into the perldelta above. Unfortunately, many of our
2173commit messages are somewhat terse and require a bit more help to turn into something readable
2174
2175
2176
2177
2178=head1 API
2179
2180=head2 Move the reg_stringify logic to Perl_sv_2pv_flags
2181
2182=head2 mg_copy ought to take an I32
2183
2184=head2 Perl_store_cop_label() isn't meant to be part of the public API.
2185
2186=head2 Perl_gv_fetchmethod{,_autoload,_flags} are actually never* called with a non-NULL stash.
2187So change the parameter to NN.
2188
2189
2190=head2 Promote Perl_setdefout() to the public API.
2191
2192=head2 Add get_cvs() as a shortcut for STR_WITH_LEN() and Perl_get_cvn_flags()
2193
2194=head2 In Perl_newCONSTSUB(), sv should not be NULL.
2195
2196=head2 GvUNIQUE* have been defined as 0 since 2005/06/30 - high time to remove them.
2197
2198=head2 invert and rename PERL_MEM_LOG_STDERR to PERL_MEM_LOG_NOIMPL
2199
2200Most users who want PERL_MEM_LOG want the default implementation,
2201give it to them. Users providing their own implementation can
2202obtain current behavior by adding -DPERL_MEM_LOG_NOIMPL.
2203Frankly, the average user probably wants _ENV by default too.
2204
2205=head2 simplify PERL_MEM_LOG
2206
2207This combines multiple environment variable reads into 1,
2208where it looks for values like "2mst"
2209-2 leading digits are atoi()d to get FD
2210-m memory logging please
2211-s sv logging also
2212-t timestamp those please.
2213
2214Combining these reduces overhead such that it seemed
2215worthwhile to drop all the ifdefs. TBD whether this works
2216in the environment that drove the original tradeoffs.
2217
2218If it isnt enough, Id be tempted by a global static ptr,
2219and on 1st use, is read, seen 0, a lock is taken, and getenvar
2220run to populate it, unlocked, proceed. This would remove
2221iterative overheads.
2222
2223=head2 Add a parameter "destructing" to Gv_AMupdate()
2224
2225This boolean parameter indicates if the function has been called
2226to update the overload magic table while looking up the DESTROY
2227method. In this case, it's probably best to avoid croaking if
2228those tables could not be updated (for example due to a method
2229that could not be loaded.)
2230
2231=head2 Modify the return value of Gv_AMupdate to indicate a compilation error
2232
eeab323f 2233This way we'll restore most of the performance on object destruction
ad1d1c50
JV
2234lost by the previous commit
2235
2236
2237=head2 local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
2238
2239Re: [perl #60360] [PATCH] UPDATED: local $SIG{FOO} = sub {...}; sets signal handler to SIG_DFL
2240Message-ID: <20081112234504.GI2062@tytlal.topaz.cx>
2241
2242Updated patch to retain source compatibility.
2243
2244Plus using the correct PERL_ARGS_ASSERT_SAVE_HELEM_FLAGS
2245macro and running make regen.
2246
2247=head2 Respecting inc_version_list while processing PERL_VENDORLIB_STEM
2248
2249Respecting inc_version_list while processing PERL_VENDORLIB_STEM
2250From: "Mandalemula, Rajesh" <Rajesh.Mandalemula@deshaw.com>
2251
2252=head2 Change PL_debug behaviour
2253
2254
2255String eval lines are now saved whenever
2256a subroutine is defined, even if the eval'd string has subsequent
2257syntax errors. This allows the debugger to single step into these
2258subroutines.
2259
2260
2261=head2 Tied filehandles now have an additional method EOF which provides the EOF type
2262
2263=head2 Perl is now smarter about adding a -I dir to the beginning or end of @INC
2264
2265=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.
2266
2267=head2 When a glob is deleted, mark its sub as ANON.
2268
2269=head2 Require a space or a newline after a "#line XXX" directive
2270
2271=head2 Forbid using "foreach" as an attribute
2272
2273(like all other control flow statements)
2274
2275
2276=head2 Unregister signal handlers before destroying my_perl
2277
2278If the signal handler runs after perl_destruct() has been called, it
2279will get an invalid (or NULL) my_perl when it asks for the
2280thread-specific interpreter struct. This patch resets the signal
2281handler for any signal previously handled by PL_csighandlerp to SIG_DFL
2282before calling perl_destruct().
2283
2284=head2 Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
2285
2286Perl_magic_clearsig() needs to remove magic, else delete $SIG{INT} returns undef
2287instead of the now-removed INT handler.
2288
2289=head2 [perl #66452] TMPDIR not honored when opening an anonymous temporary file
2290
2291[perl #66452] TMPDIR not honored when opening an anonymous temporary file
2292
2293=head2 The attached patch to perlio.c fixes the problem of errno getting set.
2294
2295While I am firmly in the school of "do not look at $! except immediately
2296after a failure", I also agree that spuriously setting it is messy. But
2297there is just no way of knowing where your errno might have been.
2298
2299The problem was that PerlIO_fast_gets() (and other nearby similar
2300capability-checking PerlIO routines) set the errno (and it was being
2301called a lot, from sv_gets()). I think setting the errno here was
2302a mistake: checking for "can has FOO" should not set external state,
2303such as the errno. The patch removes that errno trashing from all those
2304routines.
2305
2306=head2 Trim all trailing / from "." in @INC when filling %INC
2307
2308This fixes bug #66942 : as a / was left in the directory name,
2309$INC{"Foo.pm"} for a file loaded from the current directory
2310was given the incorrect value "/Foo.pm".
2311
2312=head2 Don't enqueue pending signals during global destruction
2313
2314Global destruction is not signal-safe. PL_psig_pend may already
2315be gone when the signal handler is called (with destruct_level > 0).
2316NULL it before freeing it to prevent a race condition.
2317
2318=head2 Eliminate struct regexp_allocated and xpvio_allocated.
2319
2320Calculate memory allocation using regexp and XPVIO, and the offset of the first
2321real structure member. This avoids tripping over alignment differences between
2322X* and x*_allocated, because x*_allocated doesn't have a double in it.
2323
2324
2325=head1 internals
2326
2327=head2 [perl #47047] Use of inherited AUTOLOAD for non-method is deprecated
2328
2329=head2 Remove the definitions of Null(), Nullch, Nullfp, Nullsv and PL_na when code is within the perl source tree
2330
2331=head2 Replace our assert-which-can-be-caught-by-eval with the real deal from the standard C library.
2332
2333=head2 Tweak Perl_sv_upgrade() so that references can upgrade to SVt_PV
2334
2335=head2 Eliminate prelen from struct regexp.
2336
2337=head2 Change Perl_av_iter_p() to return IV* rather than I32* (which means
2338
2339=head2 Reorder the external regexp flags to get RXf_PMf_STD_PMMOD into the
2340
2341lowest 4 bits (which saves a shift), and the "flags indicating special
2342patterns" into contiguous bits. This makes everything a little tidier,
2343and saves 88 bytes (woohoo!) of object file with -Os on x86 FreeBSD.
2344
2345
2346=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.
2347(It will always
2348fit, as chopping off 1 byte gives just enough space for recording a
2349delta of up to 127). This allows SvOOK() to co-exist with SvIOK_on(),
2350which means all the calls to SvOOK_off() [with the possibility of a
2351call to sv_backoff()] in SvIOK_on() can be removed. This ought to make
2352a lot of straight line code a little bit simpler.
2353OOK()d scalars can now be SVt_PV, as the IVX isn't needed.
2354
2355=head2 Abolish wraplen from struct regexp. We're already storing it in SvCUR.
2356
2357=head2 Make Perl_pregcomp() use SvUTF8() of the pattern, rather than the flag bit in pmflags, to decide whether the pattern is UTF-8.
2358
2359=head2 Abolish RXf_UTF8. Store the UTF-8-ness of the pattern with SvUTF8().
2360
2361=head2 In struct regexp move the member paren_names to the IV union.
2362
2363=head2 Make REGEXP a type distinct from SV. (Much like AV, CV, GV, HV).
2364
2365=head2 Allow sv_setsv_flags() to copy SVt_REGEXP much like it copies SVt_FORMAT - the just string buffer.
2366
2367
eeab323f 2368=head2 Correct a long-standing ithreads reference counting anonmaly
ad1d1c50
JV
2369
2370The reference count only needs "doubling" when the scalar is pushed onto
2371PL_regex_padav for the second time.
2372
2373
2374=head2 In PL_regexp_padav, store regexps via real references, rather than hiding them within IVs.
2375
2376We can do this now that they are real SV pointers.
2377
2378=head2 With regexps stored as real RVs, we can eliminate SvREPADTMP().
2379
2380=head2 REGEXPs are now stored directly in PL_regex_padav, rather than indirectly via RVs.
2381
2382=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.
2383
2384=head2 Remove PM_GETRE_SAFE and PM_SETRE_SAFE as nothing uses them.
2385
2386=head2 Note the U8 sized space created by removing -P, and check that it is now an illegal command line flag.
2387
2388=head2 Pack the recycled pad offsets into an SV at PL_regex_pad[0].
2389
2390=head2 Re-order so that the !SvOK() case is last (which should be rare)
2391
2392=head2 Extend PUSHFORMAT() to take a second parameter to set retop, to save NULLing it and then reassigning.
2393
2394=head2 Split struct block_sub into struct block_sub and struct block_format.
2395
2396Split struct block_sub into struct block_sub and struct block_format.
2397(CXt_SUB and CXt_FORMAT were using some comon members, but some members
2398were only for one or the other.)
2399
2400=head2 Change the wantarray result from caller from IV to bool for the SCALAR/ARRAY case.
2401
2402This doesn't contradict the documentation, as there isn't any. Oops.
2403
2404
2405=head2 Give G_VOID, G_SCALAR and G_ARRAY the same numeric values as OPf_WANT_VOID, OPf_WANT_SCALAR and OPf_WANT_LIST.
2406
2407
2408=head2 Squeeze the context type down to 4 bits, and move the private flags to fit within the next 4 bits.
2409
2410
2411=head2 In struct block change blku_type from U8 to U16, and the "spare" U8 to U16, with the lockstep changes in struct subst.
2412Eliminate lval from
2413struct block_sub, and instead store it in the U16 in struct block.
2414
2415
2416=head2 In struct block_eval, eliminate old_in_eval and old_op_type by storing the data in blk_u16.
2417
2418
2419=head2 The layout for struct block_loop under ithreads can be simplified.
2420
2421Instead of wedging the pad offset into a void* iterdata, and always
2422storing PL_comppad even when it isn't used, instead do this:
2423
eeab323f
RGS
2424 PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
2425 /* This is also accessible via cx->blk_loop.my_op->op_targ */
2426 PADOFFSET targoffset;
ad1d1c50
JV
2427
2428and store the GV pointer in oldcompad. Pointers to pointers seems
2429cleaner. This also allows us to eliminate the flag bit CXp_PADVAR.
2430
2431
2432=head2 In XS_PerlIO_get_layers() take advantage of the implementation of
2433
2434In XS_PerlIO_get_layers() take advantage of the implementation of
2435PerlIO_get_layers(), by co-opting the new SVs it creates, rather than
2436copying them.
2437
2438
2439=head2 Micro-optimise the order of the context types. [Because I can :-)]
2440
2441=head2 [patch] optimize OP_IS_(FILETEST|SOCKET) macros
2442
2443=head2 Eliminate ck_lengthconst.
2444
2445=head2 Chainsaw DEBUG_S out, as suggested by Vincent Pit.
2446
2447=head2 Unsupported private API functions are now declared "static" to prevent leakage to the public API
2448
2449=head2 Perl_cv_ckproto() is not part of the public API, and not used anywhere. It has been removed
2450
2451=head2 Remove all the 5005threads specific mutex macros, which are now vestigial.
2452
2453=head2 Do not honor TMPDIR for anonymous temporary files when tainting
2454
2455Use a default of /tmp on Unixes when TMPDIR is unset or empty, or
2456when creation of a temporary file in it fails
2457
2458=head2 Add a pluggable hook in op_free()
2459
2460
6fa80ea2
YO
2461
2462
cf8a5c47
JV
2463=head2 Dual-lifed modules moved
2464
2465Dual-lifed modules maintained primarily in the Perl core now live in ext/.
2466Dual-lifed modules maintained primarily on CPAN now live in cpan/
2467
2468=head2 MAD now builds on C++
2469
2470 Fix building MAD with C++ - a MAD_PV of "" is illegal, as it will be free()d.
2471
2472commit 4e73d6a402bc493d66d19c409c41e1e271c6450b
2473Author: Nicholas Clark <nick@ccl4.org>
2474Date: Wed Sep 23 11:59:31 2009 +0100
2475
2476 Add a --chdir option to configpm, and use this in the Win32 Makfiles.
2477
2478 A slight Makefile simplification, and another move towards Win32 standardising
2479 on running miniperl as $(MINIPERL), which currently is ..\miniperl.exe
2480
2481
2482=head2 miniperl no longer builds with UTF-8 support in the regexp engine to support the bootstrapping process
2483
2484 This allows a build to complete with PERL_UNICODE set and a UTF-8 locale.
2485 Without this there's a bootstrapping problem, as miniperl can't load the UTF-8
2486 components of the regexp engine, because they're not yet built.
2487
2488=head2 miniperl now has a restricted @INC
2489
2490 Restrict miniperl to just -I..., the split of $ENV{PERL5LIB}, and "." in @INC
2491
2492=head2 miniperl now identifies itself in the output of miniperl -V
2493
2494PERL_IS_MINIPERL is now declared in the verbose configuration output.
2495
cf8a5c47
JV
2496=head2 Parallel testing is pretty much done.
2497
cf8a5c47
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2498commit d8723a6a74b2c12e9d732728dbe717672ab893f2
2499Author: Salvador Ortiz Garcia <sog@msg.com.mx>
2500Date: Sun Sep 6 23:41:57 2009 +0200
2501
2502 Corrupt filename when setting %INC entry in a @INC hook
2503
2504 The code in pp_ctl.c after calling an @INC hook blindly assumes that the
2505 SV setted by the user in %INC is an SVPV (SvPOK true) for setting the
2506 filename. So when the user uses other scalar types, the output of
2507 __FILE__, warn, die, caller, etc. shows random garbage.
2508
2509Author: Zefram <zefram@fysh.org>
2510Date: Sun Sep 6 17:29:43 2009 +0200
2511
2512 Fix [perl #66970] Incorrect coderef in MODIFY_CODE_ATTRIBUTES
2513
2514 Attribute handlers being applied to a temporary CV has actually been
2515 reported as a bug, #66970. The attached patch fixes the bug, by
2516 changing the order in which things happen: attributes are now applied
2517 after the temporary CV has been merged into the existing CV or has
2518 otherwise been added to the appropriate GV.
2519
2520 The change breaks part of Attribute::Handlers. Part of A:H searches the
2521 package to find the name of the sub to which a :ATTR attribute is being
2522 applied, and the correct time at which to launch that search depends
2523 crucially on the order in which the CV construction events occur. So
2524 this patch also includes a change to A:H, to make it detect which way
2525 things happen. The resulting A:H works either way, which is essential
2526 for its dual-life nature.
2527
2528commit 354c724e8ab74f150e14800acc80d505949161f5
2529Author: Nicholas Clark <nick@ccl4.org>
2530Date: Fri Sep 4 11:04:30 2009 +0100
2531
2532 OS/2 hadn't been updated to cope with the ext/ restructuring.
2533
2534 I don't have OS/2, so I can't test this, but the code in Configure will assume
2535 flat directories, because ext/File-Glob is present, and hence not search
2536 recursively and not find the OS/2 extensions if they are copied into ext/OS2/*
2537
2538 I believe that without this change OS/2 will not have been building since the
2539 change to flattened ext. This change may not be sufficient to get OS/2
2540 building again, but it is in the right direction.
2541
2542commit bf6bfb44d9f2e07e4bd25b8eba2d9132fcec637e
2543Author: Abhijit Menon-Sen <ams@toroid.org>
2544Date: Fri Sep 4 12:41:56 2009 +0530
2545
2546 Entity-encode E<0xNNNN> and E<0NNN> correctly
2547
2548 Fixes bug #68964 reported by samv, where pod2html encoded E<0x2070> to
2549 &0x2070 and not &#x2070. perlpodspec says E<0x2070> should work, but the
2550 code in Pod::Html accepted only E<x2070>. The new code accepts both, and
2551 processes octal entities correctly as well.
2552
2553 Signed-off-by: Abhijit Menon-Sen <ams@toroid.org>
2554
2555commit 61131c9411631986e27506a8a66b4d43f2f3e4e0
2556Author: Karl Williamson <khw@khw-desktop.(none)>
2557Date: Thu Sep 3 11:29:30 2009 -0600
2558
2559 Add missing files from Unicode 5.1 Character Database
2560
2561
cf8a5c47
JV
2562=head2 set PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS to 0 and enable proper POSIX char class matching
2563
2564 This also alters which Unicode properties that the POSIX character
2565 class and the Perl "special" character classes, like \w and \d map
2566 to. At the same time it allows a number of tests for POSIX character
2567 class behaviour to be switched from todo to non todo. Legacy testing
2568 is still available by changing the define and setting the
2569 PERL_TEST_LEGACY_POSIX_CC value to true.
2570
2571
2572commit 89904c08923161afd23c629d5c2c7472a09c16bb
2573Author: Lubomir Rintel <lkundrak@v3.sk>
2574Date: Mon Aug 31 11:45:23 2009 +0200
2575
2576 Fix unpack of abstract socket addrs with nul byte
2577
2578 Addresses of Linux abstract namespace sockets are not nul-terminated C
2579 strings, but rather an arbitrary character arrays. According to unix(7)
2580 documentation from Linux, "Null bytes in the name have no special
2581 significance."
2582
2583 unpack_sockaddr_un() was just throwing the initial nul byte away and
2584 then treating the rest like ordinary C string when computing the length
2585 of the address, which was wrong. This fix utilizes the length of the PV
2586 for addresses starting with nul instead.
2587
2588 The regression test was extended with check for the problem.
2589
2590
cf8a5c47
JV
2591commit 16fa5c119c4bda5c0396a5f81296bd1ccc128a9c
2592Author: Vincent Pit <perl@profvince.com>
2593Date: Thu Aug 27 11:13:09 2009 +0200
2594
2595 Speed up repeatcpy() by at least 40% for 1-char or numerous repeats
2596
2597 And don't make it receive the interpreter anymore.
2598
2599 For 1-char repeats, use memset(). Otherwise, use the old implementation up
2600 to some (small) length, and then use memcpy() in a binary manner, based on
2601 what we previously copied.
2602
2603 Note that we use memcpy() so both strings shouldn't overlap. The previous
2604 implementation didn't allow this as well. This would be a good place to use
2605 the restrict keyword from C99. I'm not sure if Configure has a probe for it.
2606
2607=head2 set utf8 bit on inferred method names when C<use utf8>
2608
2609=head2 New debugging flag -DB now dumps subroutine definitions,
2610 leaving -Dx for its original purpose of dumping syntax trees.
2611
2612
2613=head2 Make MAD understand the "..." operator
2614
2615
2616=head2 Add support for Abstract namespace sockets
2617
2618 Abstract namespace sockets are Linux-specific socket type that live in
2619 AF_UNIX family, slightly abusing it to be able to use arbitrary
2620 character arrays as addresses: They start with nul byte and are not
2621 terminated by nul byte, but with the length passed to the socket()
2622 system call.
2623
2624 Added regression test for the correct address length computation.
2625
2626 Signed-off-by: Lubomir Rintel <lkundrak@fedoraproject.org>
2627
cf8a5c47
JV
2628
2629=head2 Note that linearising C3 MRO is now 40% faster for single inheritance.
2630
2631=head2 Fix a B::Deparse bug - constants and PCSs were appearing as subroutine stubs.
2632
2633
cf8a5c47 2634
cf8a5c47
JV
2635
2636
cf8a5c47
JV
2637
2638=head2 Win32: Don't explicitly link against msvcrt when using MinGW.
2639
2640 The latest releases of MinGW generate hard linker errors
2641 when msvcrt is specified explicitly. It will still link
2642 against this library implicitly anyways, so specifying it
2643 isn't needed.
2644
cf8a5c47
JV
2645=head2 Add security contact information to perlsec
2646
d7ea0f56 2647=item Introduce "delete local"
cf8a5c47
JV
2648
2649commit 7332a6c406299d5e73836d2410689bd7c3ae4782
6fa80ea2 2650