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1 | =head1 NAME |
2 | |
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3 | perl5110delta - what is new for perl v5.11.0 |
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4 | |
5 | =head1 DESCRIPTION |
6 | |
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7 | This document describes differences between the 5.10.0 release and |
8 | the 5.11.0 development release. |
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9 | |
10 | =head1 Incompatible Changes |
11 | |
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12 | =head2 Switch statement changes |
13 | |
14 | The handling of complex expressions by the C<given>/C<when> switch |
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15 | statement has been enhanced. There are two new cases where C<when> now |
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16 | interprets its argument as a boolean, instead of an expression to be used |
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17 | in a smart match: |
18 | |
19 | =over 4 |
20 | |
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21 | =item flip-flop operators |
22 | |
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23 | The C<..> and C<...> flip-flop operators are now evaluated in boolean |
24 | context, following their usual semantics; see L<perlop/"Range Operators">. |
25 | |
26 | Note that, as in perl 5.10.0, C<when (1..10)> will not work to test |
27 | whether a given value is an integer between 1 and 10; you should use |
28 | C<when ([1..10])> instead (note the array reference). |
29 | |
30 | However, contrary to 5.10.0, evaluating the flip-flop operators in boolean |
31 | context ensures it can now be useful in a C<when()>, notably for |
32 | implementing bistable conditions, like in: |
33 | |
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34 | when (/^=begin/ .. /^=end/) { |
35 | # do something |
36 | } |
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37 | |
38 | =item defined-or operator |
39 | |
40 | A compound expression involving the defined-or operator, as in |
41 | C<when (expr1 // expr2)>, will be treated as boolean if the first |
42 | expression is boolean. (This just extends the existing rule that applies |
43 | to the regular or operator, as in C<when (expr1 || expr2)>.) |
44 | |
45 | =back |
46 | |
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47 | The next section details more changes brought to the semantics to |
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48 | the smart match operator, that naturally also modify the behaviour |
49 | of the switch statements where smart matching is implicitly used. |
50 | |
51 | =head2 Smart match changes |
52 | |
53 | =head3 Changes to type-based dispatch |
54 | |
55 | The smart match operator C<~~> is no longer commutative. The behaviour of |
56 | a smart match now depends primarily on the type of its right hand |
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57 | argument. Moreover, its semantics have been adjusted for greater |
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58 | consistency or usefulness in several cases. While the general backwards |
59 | compatibility is maintained, several changes must be noted: |
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60 | |
61 | =over 4 |
62 | |
63 | =item * |
64 | |
65 | Code references with an empty prototype are no longer treated specially. |
66 | They are passed an argument like the other code references (even if they |
67 | choose to ignore it). |
68 | |
69 | =item * |
70 | |
71 | C<%hash ~~ sub {}> and C<@array ~~ sub {}> now test that the subroutine |
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72 | returns a true value for each key of the hash (or element of the |
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73 | array), instead of passing the whole hash or array as a reference to |
74 | the subroutine. |
75 | |
76 | =item * |
77 | |
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78 | Due to the commutativity breakage, code references are no longer |
79 | treated specially when appearing on the left of the C<~~> operator, |
80 | but like any vulgar scalar. |
81 | |
82 | =item * |
83 | |
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84 | C<undef ~~ %hash> is always false (since C<undef> can't be a key in a |
85 | hash). No implicit conversion to C<""> is done (as was the case in perl |
86 | 5.10.0). |
87 | |
88 | =item * |
89 | |
90 | C<$scalar ~~ @array> now always distributes the smart match across the |
91 | elements of the array. It's true if one element in @array verifies |
92 | C<$scalar ~~ $element>. This is a generalization of the old behaviour |
93 | that tested whether the array contained the scalar. |
94 | |
95 | =back |
96 | |
97 | The full dispatch table for the smart match operator is given in |
98 | L<perlsyn/"Smart matching in detail">. |
99 | |
100 | =head3 Smart match and overloading |
101 | |
102 | According to the rule of dispatch based on the rightmost argument type, |
103 | when an object overloading C<~~> appears on the right side of the |
104 | operator, the overload routine will always be called (with a 3rd argument |
105 | set to a true value, see L<overload>.) However, when the object will |
106 | appear on the left, the overload routine will be called only when the |
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107 | rightmost argument is a simple scalar. This way distributivity of smart match |
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108 | across arrays is not broken, as well as the other behaviours with complex |
109 | types (coderefs, hashes, regexes). Thus, writers of overloading routines |
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110 | for smart match mostly need to worry only with comparing against a scalar, |
111 | and possibly with stringification overloading; the other common cases |
112 | will be automatically handled consistently. |
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113 | |
114 | C<~~> will now refuse to work on objects that do not overload it (in order |
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115 | to avoid relying on the object's underlying structure). (However, if the |
116 | object overloads the stringification or the numification operators, and |
117 | if overload fallback is active, it will be used instead, as usual.) |
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118 | |
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119 | =head2 Labels can't be keywords |
120 | |
121 | Labels used as targets for the C<goto>, C<last>, C<next> or C<redo> |
122 | statements cannot be keywords anymore. This restriction will prevent |
123 | potential confusion between the C<goto LABEL> and C<goto EXPR> syntaxes: |
124 | for example, a statement like C<goto print> would jump to a label whose |
125 | name would be the return value of print(), (usually 1), instead of a |
126 | label named C<print>. Moreover, the other control flow statements |
127 | would just ignore any keyword passed to them as a label name. Since |
128 | such labels cannot be defined anymore, this kind of error will be |
129 | avoided. |
130 | |
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131 | =head2 Other incompatible changes |
132 | |
133 | =over 4 |
134 | |
135 | =item * |
136 | |
137 | The semantics of C<use feature :5.10*> have changed slightly. |
138 | See L<"Modules and Pragmata"> for more information. |
139 | |
140 | =item * |
141 | |
142 | It is now a run-time error to use the smart match operator C<~~> |
143 | with an object that has no overload defined for it. (This way |
144 | C<~~> will not break encapsulation by matching against the |
145 | object's internal representation as a reference.) |
146 | |
147 | =item * |
148 | |
149 | The version control system used for the development of the perl |
150 | interpreter has been switched from Perforce to git. This is mainly an |
151 | internal issue that only affects people actively working on the perl core; |
152 | but it may have minor external visibility, for example in some of details |
153 | of the output of C<perl -V>. See L<perlrepository> for more information. |
154 | |
155 | =item * |
156 | |
157 | The internal structure of the C<ext/> directory in the perl source has |
158 | been reorganised. In general, a module C<Foo::Bar> whose source was |
159 | stored under F<ext/Foo/Bar/> is now located under F<ext/Foo-Bar/>. Also, |
160 | some modules have been moved from F<lib/> to F<ext/>. This is purely a |
161 | source tarball change, and should make no difference to the compilation or |
162 | installation of perl, unless you have a very customised build process that |
163 | explicitly relies on this structure, or which hard-codes the C<nonxs_ext> |
164 | F<Configure> parameter. Specifically, this change does not by default |
165 | alter the location of any files in the final installation. |
166 | |
167 | =item * |
168 | |
169 | As part of the C<Test::Harness> 2.x to 3.x upgrade, the experimental |
170 | C<Test::Harness::Straps> module has been removed. |
171 | See L</"Updated Modules"> for more details. |
172 | |
173 | =item * |
174 | |
175 | As part of the C<ExtUtils::MakeMaker> upgrade, the |
176 | C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish> modules |
177 | have been removed from this distribution. |
178 | |
179 | =item * |
180 | |
181 | C<Module::CoreList> no longer contains the C<%:patchlevel> hash. |
182 | |
183 | =item * |
184 | |
185 | This one is actually a change introduced in 5.10.0, but it was missed |
186 | from that release's perldelta, so it is mentioned here instead. |
187 | |
188 | A bugfix related to the handling of the C</m> modifier and C<qr> resulted |
189 | in a change of behaviour between 5.8.x and 5.10.0: |
190 | |
191 | # matches in 5.8.x, doesn't match in 5.10.0 |
192 | $re = qr/^bar/; "foo\nbar" =~ /$re/m; |
193 | |
194 | =back |
195 | |
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196 | =head1 Core Enhancements |
197 | |
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198 | =head2 Unicode Character Database 5.1.0 |
199 | |
200 | The copy of the Unicode Character Database included in Perl 5.10.1 has |
201 | been updated to 5.1.0 from 5.0.0. See |
202 | L<http://www.unicode.org/versions/Unicode5.1.0/#Notable_Changes> for the |
203 | notable changes. |
204 | |
205 | =head2 A proper interface for pluggable Method Resolution Orders |
206 | |
207 | As of Perl 5.10.1 there is a new interface for plugging and using method |
208 | resolution orders other than the default (linear depth first search). |
209 | The C3 method resolution order added in 5.10.0 has been re-implemented as |
210 | a plugin, without changing its Perl-space interface. See L<perlmroapi> for |
211 | more information. |
212 | |
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213 | =head2 The C<overloading> pragma |
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214 | |
215 | This pragma allows you to lexically disable or enable overloading |
216 | for some or all operations. (Yuval Kogman) |
217 | |
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218 | =head2 C<\N> regex escape |
219 | |
220 | A new regex escape has been added, C<\N>. It will match any character that |
221 | is not a newline, independently from the presence or absence of the single |
222 | line match modifier C</s>. (If C<\N> is followed by an opening brace and |
223 | by a letter, perl will still assume that a Unicode character name is |
224 | coming, so compatibility is preserved.) (Rafael Garcia-Suarez) |
225 | |
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226 | =head2 Implicit strictures |
227 | |
228 | Using the C<use VERSION> syntax with a version number greater or equal |
229 | to 5.11.0 will also lexically enable strictures just like C<use strict> |
230 | would do (in addition to enabling features.) So, the following: |
231 | |
232 | use 5.11.0; |
233 | |
234 | will now imply: |
235 | |
236 | use strict; |
237 | use feature ':5.11'; |
238 | |
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239 | =head2 Parallel tests |
240 | |
241 | The core distribution can now run its regression tests in parallel on |
242 | Unix-like platforms. Instead of running C<make test>, set C<TEST_JOBS> in |
243 | your environment to the number of tests to run in parallel, and run |
244 | C<make test_harness>. On a Bourne-like shell, this can be done as |
245 | |
246 | TEST_JOBS=3 make test_harness # Run 3 tests in parallel |
247 | |
248 | An environment variable is used, rather than parallel make itself, because |
249 | L<TAP::Harness> needs to be able to schedule individual non-conflicting test |
250 | scripts itself, and there is no standard interface to C<make> utilities to |
251 | interact with their job schedulers. |
252 | |
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253 | Note that currently some test scripts may fail when run in parallel (most |
254 | notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts |
255 | again sequentially and see if the failures go away. |
256 | |
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257 | =head2 The C<...> operator |
258 | |
259 | A new operator, C<...>, nicknamed the Yada Yada operator, has been added. |
260 | It is intended to mark placeholder code, that is not yet implemented. |
261 | See L<perlop/"Yada Yada Operator">. (chromatic) |
262 | |
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263 | =head2 DTrace support |
264 | |
265 | Some support for DTrace has been added. See "DTrace support" in F<INSTALL>. |
266 | |
267 | =head2 Support for C<configure_requires> in CPAN module metadata |
268 | |
269 | Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> keyword |
270 | in the C<META.yml> metadata file included in most recent CPAN distributions. |
271 | This allows distribution authors to specify configuration prerequisites that |
272 | must be installed before running F<Makefile.PL> or F<Build.PL>. |
273 | |
274 | See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for more |
275 | on how to specify C<configure_requires> when creating a distribution for CPAN. |
276 | |
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277 | =head1 Modules and Pragmata |
278 | |
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279 | =head2 New Modules and Pragmata |
280 | |
281 | =over 4 |
282 | |
283 | =item C<autodie> |
284 | |
285 | This is a new lexically-scoped alternative for the C<Fatal> module. |
286 | The bundled version is 2.06_01. Note that in this release, using a string |
287 | eval when C<autodie> is in effect can cause the autodie behaviour to leak |
288 | into the surrounding scope. See L<autodie/"BUGS"> for more details. |
289 | |
290 | =item C<Compress::Raw::Bzip2> |
291 | |
292 | This has been added to the core (version 2.020). |
293 | |
294 | =item C<parent> |
295 | |
296 | This pragma establishes an ISA relationship with base classes at compile |
297 | time. It provides the key feature of C<base> without the feature creep. |
298 | |
299 | =item C<Parse::CPAN::Meta> |
300 | |
301 | This has been added to the core (version 1.39). |
302 | |
303 | =back |
304 | |
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305 | =head2 Pragmata Changes |
306 | |
307 | =over 4 |
308 | |
309 | =item C<overloading> |
310 | |
311 | See L</"The C<overloading> pragma"> above. |
312 | |
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313 | =item C<attributes> |
314 | |
315 | Upgraded from version 0.08 to 0.09. |
316 | |
317 | =item C<attrs> |
318 | |
319 | Upgraded from version 1.02 to 1.03. |
320 | |
321 | =item C<base> |
322 | |
323 | Upgraded from version 2.13 to 2.14. See L<parent> for a replacement. |
324 | |
325 | =item C<bigint> |
326 | |
327 | Upgraded from version 0.22 to 0.23. |
328 | |
329 | =item C<bignum> |
330 | |
331 | Upgraded from version 0.22 to 0.23. |
332 | |
333 | =item C<bigrat> |
334 | |
335 | Upgraded from version 0.22 to 0.23. |
336 | |
337 | =item C<charnames> |
338 | |
339 | Upgraded from version 1.06 to 1.07. |
340 | |
341 | The Unicode F<NameAliases.txt> database file has been added. This has the |
342 | effect of adding some extra C<\N> character names that formerly wouldn't |
343 | have been recognised; for example, C<"\N{LATIN CAPITAL LETTER GHA}">. |
344 | |
345 | =item C<constant> |
346 | |
347 | Upgraded from version 1.13 to 1.17. |
348 | |
349 | =item C<feature> |
350 | |
351 | The meaning of the C<:5.10> and C<:5.10.X> feature bundles has |
352 | changed slightly. The last component, if any (i.e. C<X>) is simply ignored. |
353 | This is predicated on the assumption that new features will not, in |
354 | general, be added to maintenance releases. So C<:5.10> and C<:5.10.X> |
355 | have identical effect. This is a change to the behaviour documented for |
356 | 5.10.0. |
357 | |
358 | =item C<fields> |
359 | |
360 | Upgraded from version 2.13 to 2.14 (this was just a version bump; there |
361 | were no functional changes). |
362 | |
363 | =item C<lib> |
364 | |
365 | Upgraded from version 0.5565 to 0.62. |
366 | |
367 | =item C<open> |
368 | |
369 | Upgraded from version 1.06 to 1.07. |
370 | |
371 | =item C<overload> |
372 | |
373 | Upgraded from version 1.06 to 1.07. |
374 | |
375 | =item C<overloading> |
376 | |
377 | See L</"The C<overloading> pragma"> above. |
378 | |
379 | =item C<version> |
380 | |
381 | Upgraded from version 0.74 to 0.77. |
382 | |
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383 | =back |
384 | |
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385 | =head2 Updated Modules |
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386 | |
387 | =over 4 |
388 | |
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389 | =item C<Archive::Extract> |
390 | |
391 | Upgraded from version 0.24 to 0.34. |
392 | |
393 | =item C<Archive::Tar> |
394 | |
395 | Upgraded from version 1.38 to 1.52. |
396 | |
397 | =item C<Attribute::Handlers> |
398 | |
399 | Upgraded from version 0.79 to 0.85. |
400 | |
401 | =item C<AutoLoader> |
402 | |
403 | Upgraded from version 5.63 to 5.68. |
404 | |
405 | =item C<AutoSplit> |
406 | |
407 | Upgraded from version 1.05 to 1.06. |
408 | |
409 | =item C<B> |
410 | |
411 | Upgraded from version 1.17 to 1.22. |
412 | |
413 | =item C<B::Debug> |
414 | |
415 | Upgraded from version 1.05 to 1.11. |
416 | |
417 | =item C<B::Deparse> |
418 | |
419 | Upgraded from version 0.83 to 0.89. |
420 | |
421 | =item C<B::Lint> |
422 | |
423 | Upgraded from version 1.09 to 1.11. |
424 | |
425 | =item C<B::Xref> |
426 | |
427 | Upgraded from version 1.01 to 1.02. |
428 | |
429 | =item C<Benchmark> |
430 | |
431 | Upgraded from version 1.10 to 1.11. |
432 | |
433 | =item C<Carp> |
434 | |
435 | Upgraded from version 1.08 to 1.11. |
436 | |
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437 | L<Carp> now includes all the necessary code to function. Previously, it |
438 | used to be a lightweight placeholder that loaded the actual code from |
439 | C<Carp::Heavy> on demand. C<Carp::Heavy> is now a simple, empty module |
440 | kept for backwards compatibility for programs that used to pre-load it. |
441 | |
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442 | |
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443 | =item C<CGI> |
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444 | |
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445 | Upgraded from version 3.29 to 3.43. |
446 | (also includes the "default_value for popup_menu()" fix from 3.45). |
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447 | |
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448 | =item C<Compress::Zlib> |
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449 | |
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450 | Upgraded from version 2.008 to 2.020. |
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451 | |
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452 | =item C<CPAN> |
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453 | |
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454 | Upgraded from version 1.9205 to 1.9402. C<CPAN::FTP> has a local fix to |
455 | stop it being too verbose on download failure. |
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456 | |
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457 | =item C<CPANPLUS> |
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458 | |
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459 | Upgraded from version 0.84 to 0.88. |
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460 | |
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461 | =item C<CPANPLUS::Dist::Build> |
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462 | |
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463 | Upgraded from version 0.06_02 to 0.36. |
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464 | |
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465 | =item C<Cwd> |
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466 | |
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467 | Upgraded from version 3.25_01 to 3.30. |
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468 | |
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469 | =item C<Data::Dumper> |
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470 | |
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471 | Upgraded from version 2.121_14 to 2.124. |
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472 | |
5a00ee6a |
473 | =item C<DB> |
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474 | |
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475 | Upgraded from version 1.01 to 1.02. |
476 | |
477 | =item C<DB_File> |
478 | |
479 | Upgraded from version 1.816_1 to 1.820. |
480 | |
481 | =item C<Devel::PPPort> |
482 | |
483 | Upgraded from version 3.13 to 3.19. |
484 | |
485 | =item C<Digest::MD5> |
486 | |
487 | Upgraded from version 2.36_01 to 2.39. |
488 | |
489 | =item C<Digest::SHA> |
490 | |
491 | Upgraded from version 5.45 to 5.47. |
492 | |
493 | =item C<DirHandle> |
494 | |
495 | Upgraded from version 1.01 to 1.03. |
496 | |
497 | =item C<Dumpvalue> |
498 | |
499 | Upgraded from version 1.12 to 1.13. |
500 | |
501 | =item C<DynaLoader> |
502 | |
503 | Upgraded from version 1.08 to 1.10. |
504 | |
505 | =item C<Encode> |
506 | |
507 | Upgraded from version 2.23 to 2.35. |
508 | |
509 | =item C<Errno> |
510 | |
511 | Upgraded from version 1.10 to 1.11. |
512 | |
513 | =item C<Exporter> |
514 | |
515 | Upgraded from version 5.62 to 5.63. |
516 | |
517 | =item C<ExtUtils::CBuilder> |
518 | |
519 | Upgraded from version 0.21 to 0.2602. |
520 | |
521 | =item C<ExtUtils::Command> |
522 | |
523 | Upgraded from version 1.13 to 1.16. |
524 | |
525 | =item C<ExtUtils::Constant> |
526 | |
527 | Upgraded from 0.20 to 0.22. (Note that neither of these versions are |
528 | available on CPAN.) |
529 | |
530 | =item C<ExtUtils::Embed> |
531 | |
532 | Upgraded from version 1.27 to 1.28. |
533 | |
534 | =item C<ExtUtils::Install> |
535 | |
536 | Upgraded from version 1.44 to 1.54. |
537 | |
538 | =item C<ExtUtils::MakeMaker> |
539 | |
540 | Upgraded from version 6.42 to 6.55_02. |
541 | |
542 | Note that C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish> |
543 | have been removed from this distribution. |
544 | |
545 | =item C<ExtUtils::Manifest> |
546 | |
547 | Upgraded from version 1.51_01 to 1.56. |
548 | |
549 | =item C<ExtUtils::ParseXS> |
550 | |
551 | Upgraded from version 2.18_02 to 2.2002. |
552 | |
553 | =item C<Fatal> |
554 | |
555 | Upgraded from version 1.05 to 2.06_01. See also the new pragma C<autodie>. |
556 | |
557 | =item C<File::Basename> |
558 | |
559 | Upgraded from version 2.76 to 2.77. |
560 | |
561 | =item C<File::Compare> |
562 | |
563 | Upgraded from version 1.1005 to 1.1006. |
564 | |
565 | =item C<File::Copy> |
566 | |
567 | Upgraded from version 2.11 to 2.14. |
568 | |
569 | =item C<File::Fetch> |
570 | |
571 | Upgraded from version 0.14 to 0.20. |
572 | |
573 | =item C<File::Find> |
574 | |
575 | Upgraded from version 1.12 to 1.14. |
576 | |
577 | =item C<File::Path> |
578 | |
579 | Upgraded from version 2.04 to 2.07_03. |
580 | |
581 | =item C<File::Spec> |
582 | |
583 | Upgraded from version 3.2501 to 3.30. |
584 | |
585 | =item C<File::stat> |
586 | |
587 | Upgraded from version 1.00 to 1.01. |
588 | |
589 | =item C<File::Temp> |
590 | |
591 | Upgraded from version 0.18 to 0.22. |
592 | |
593 | =item C<FileCache> |
594 | |
595 | Upgraded from version 1.07 to 1.08. |
596 | |
597 | =item C<FileHandle> |
598 | |
599 | Upgraded from version 2.01 to 2.02. |
600 | |
601 | =item C<Filter::Simple> |
602 | |
603 | Upgraded from version 0.82 to 0.84. |
604 | |
605 | =item C<Filter::Util::Call> |
606 | |
607 | Upgraded from version 1.07 to 1.08. |
608 | |
609 | =item C<FindBin> |
610 | |
611 | Upgraded from version 1.49 to 1.50. |
612 | |
613 | =item C<GDBM_File> |
614 | |
615 | Upgraded from version 1.08 to 1.09. |
616 | |
617 | =item C<Getopt::Long> |
618 | |
619 | Upgraded from version 2.37 to 2.38. |
620 | |
621 | =item C<Hash::Util::FieldHash> |
622 | |
623 | Upgraded from version 1.03 to 1.04. This fixes a memory leak. |
624 | |
625 | =item C<I18N::Collate> |
626 | |
627 | Upgraded from version 1.00 to 1.01. |
628 | |
629 | =item C<IO> |
630 | |
631 | Upgraded from version 1.23_01 to 1.25. |
632 | |
633 | This makes non-blocking mode work on Windows in C<IO::Socket::INET> |
634 | [CPAN #43573]. |
635 | |
636 | =item C<IO::Compress::*> |
637 | |
638 | Upgraded from version 2.008 to 2.020. |
639 | |
640 | =item C<IO::Dir> |
641 | |
642 | Upgraded from version 1.06 to 1.07. |
643 | |
644 | =item C<IO::Handle> |
645 | |
646 | Upgraded from version 1.27 to 1.28. |
647 | |
648 | =item C<IO::Socket> |
649 | |
650 | Upgraded from version 1.30_01 to 1.31. |
651 | |
652 | =item C<IO::Zlib> |
653 | |
654 | Upgraded from version 1.07 to 1.09. |
655 | |
656 | =item C<IPC::Cmd> |
657 | |
658 | Upgraded from version 0.40_1 to 0.46. |
659 | |
660 | =item C<IPC::Open3> |
661 | |
662 | Upgraded from version 1.02 to 1.04. |
663 | |
664 | =item C<IPC::SysV> |
665 | |
666 | Upgraded from version 1.05 to 2.01. |
667 | |
668 | =item C<lib> |
669 | |
670 | Upgraded from version 0.5565 to 0.62. |
671 | |
672 | =item C<List::Util> |
673 | |
674 | Upgraded from version 1.19 to 1.21. |
675 | |
676 | =item C<Locale::MakeText> |
677 | |
678 | Upgraded from version 1.12 to 1.13. |
679 | |
680 | =item C<Log::Message> |
681 | |
682 | Upgraded from version 0.01 to 0.02. |
683 | |
684 | =item C<Math::BigFloat> |
685 | |
686 | Upgraded from version 1.59 to 1.60. |
687 | |
688 | =item C<Math::BigInt> |
689 | |
690 | Upgraded from version 1.88 to 1.89. |
691 | |
692 | =item C<Math::BigInt::FastCalc> |
693 | |
694 | Upgraded from version 0.16 to 0.19. |
695 | |
696 | =item C<Math::BigRat> |
697 | |
698 | Upgraded from version 0.21 to 0.22. |
699 | |
700 | =item C<Math::Complex> |
701 | |
702 | Upgraded from version 1.37 to 1.56. |
703 | |
704 | =item C<Math::Trig> |
705 | |
706 | Upgraded from version 1.04 to 1.20. |
707 | |
708 | =item C<Memoize> |
709 | |
710 | Upgraded from version 1.01_02 to 1.01_03 (just a minor documentation |
711 | change). |
712 | |
713 | =item C<Module::Build> |
714 | |
715 | Upgraded from version 0.2808_01 to 0.34_02. |
716 | |
717 | =item C<Module::CoreList> |
718 | |
719 | Upgraded from version 2.13 to 2.18. This release no longer contains the |
720 | C<%Module::CoreList::patchlevel> hash. |
721 | |
722 | =item C<Module::Load> |
723 | |
724 | Upgraded from version 0.12 to 0.16. |
725 | |
726 | =item C<Module::Load::Conditional> |
727 | |
728 | Upgraded from version 0.22 to 0.30. |
729 | |
730 | =item C<Module::Loaded> |
731 | |
732 | Upgraded from version 0.01 to 0.02. |
733 | |
734 | =item C<Module::Pluggable> |
735 | |
736 | Upgraded from version 3.6 to 3.9. |
737 | |
738 | =item C<NDBM_File> |
739 | |
740 | Upgraded from version 1.07 to 1.08. |
741 | |
742 | =item C<Net::Ping> |
743 | |
744 | Upgraded from version 2.33 to 2.36. |
745 | |
746 | =item C<NEXT> |
747 | |
748 | Upgraded from version 0.60_01 to 0.64. |
749 | |
750 | =item C<Object::Accessor> |
751 | |
752 | Upgraded from version 0.32 to 0.34. |
753 | |
754 | =item C<OS2::REXX> |
755 | |
756 | Upgraded from version 1.03 to 1.04. |
757 | |
758 | =item C<Package::Constants> |
759 | |
760 | Upgraded from version 0.01 to 0.02. |
761 | |
762 | =item C<PerlIO> |
763 | |
764 | Upgraded from version 1.04 to 1.06. |
765 | |
766 | =item C<PerlIO::via> |
767 | |
768 | Upgraded from version 0.04 to 0.07. |
769 | |
770 | =item C<Pod::Man> |
771 | |
772 | Upgraded from version 2.16 to 2.22. |
773 | |
774 | =item C<Pod::Parser> |
775 | |
776 | Upgraded from version 1.35 to 1.37. |
777 | |
778 | =item C<Pod::Simple> |
779 | |
780 | Upgraded from version 3.05 to 3.07. |
781 | |
782 | =item C<Pod::Text> |
783 | |
784 | Upgraded from version 3.08 to 3.13. |
785 | |
786 | =item C<POSIX> |
787 | |
788 | Upgraded from version 1.13 to 1.17. |
789 | |
790 | =item C<Safe> |
791 | |
792 | Upgraded from 2.12 to 2.18. |
793 | |
794 | =item C<Scalar::Util> |
795 | |
796 | Upgraded from version 1.19 to 1.21. |
797 | |
798 | =item C<SelectSaver> |
799 | |
800 | Upgraded from 1.01 to 1.02. |
801 | |
802 | =item C<SelfLoader> |
803 | |
804 | Upgraded from 1.11 to 1.17. |
805 | |
806 | =item C<Socket> |
807 | |
808 | Upgraded from 1.80 to 1.82. |
809 | |
810 | =item C<Storable> |
811 | |
812 | Upgraded from 2.18 to 2.20. |
813 | |
814 | =item C<Switch> |
815 | |
816 | Upgraded from version 2.13 to 2.14. Please see L</Deprecations>. |
817 | |
818 | =item C<Symbol> |
819 | |
820 | Upgraded from version 1.06 to 1.07. |
821 | |
822 | =item C<Sys::Syslog> |
823 | |
824 | Upgraded from version 0.22 to 0.27. |
825 | |
826 | =item C<Term::ANSIColor> |
827 | |
828 | Upgraded from version 1.12 to 2.00. |
829 | |
830 | =item C<Term::ReadLine> |
831 | |
832 | Upgraded from version 1.03 to 1.04. |
833 | |
834 | =item C<Term::UI> |
835 | |
836 | Upgraded from version 0.18 to 0.20. |
837 | |
838 | =item C<Test::Harness> |
839 | |
840 | Upgraded from version 2.64 to 3.17. |
841 | |
842 | Note that one side-effect of the 2.x to 3.x upgrade is that the |
843 | experimental C<Test::Harness::Straps> module (and its supporting |
844 | C<Assert>, C<Iterator>, C<Point> and C<Results> modules) have been |
845 | removed. If you still need this, then they are available in the |
846 | (unmaintained) C<Test-Harness-Straps> distribution on CPAN. |
847 | |
848 | =item C<Test::Simple> |
849 | |
850 | Upgraded from version 0.72 to 0.92. |
851 | |
852 | =item C<Text::ParseWords> |
853 | |
854 | Upgraded from version 3.26 to 3.27. |
855 | |
856 | =item C<Text::Tabs> |
857 | |
858 | Upgraded from version 2007.1117 to 2009.0305. |
859 | |
860 | =item C<Text::Wrap> |
861 | |
862 | Upgraded from version 2006.1117 to 2009.0305. |
863 | |
864 | =item C<Thread::Queue> |
865 | |
866 | Upgraded from version 2.00 to 2.11. |
867 | |
868 | =item C<Thread::Semaphore> |
869 | |
870 | Upgraded from version 2.01 to 2.09. |
871 | |
872 | =item C<threads> |
873 | |
874 | Upgraded from version 1.67 to 1.72. |
875 | |
876 | =item C<threads::shared> |
877 | |
878 | Upgraded from version 1.14 to 1.29. |
879 | |
880 | =item C<Tie::RefHash> |
881 | |
882 | Upgraded from version 1.37 to 1.38. |
883 | |
884 | =item C<Tie::StdHandle> |
885 | |
886 | This has documentation changes, and has been assigned a version for the |
887 | first time: version 4.2. |
888 | |
889 | =item C<Time::HiRes> |
890 | |
891 | Upgraded from version 1.9711 to 1.9719. |
892 | |
893 | =item C<Time::Local> |
894 | |
895 | Upgraded from version 1.18 to 1.1901. |
896 | |
897 | =item C<Time::Piece> |
898 | |
899 | Upgraded from version 1.12 to 1.15. |
900 | |
901 | =item C<Unicode::Normalize> |
902 | |
903 | Upgraded from version 1.02 to 1.03. |
904 | |
905 | =item C<Unicode::UCD> |
906 | |
907 | Upgraded from version 0.25 to 0.27. |
908 | |
909 | C<charinfo()> now works on Unified CJK code points added to later versions |
910 | of Unicode. |
911 | |
912 | C<casefold()> has new fields returned to provide both a simpler interface |
913 | and previously missing information. The old fields are retained for |
914 | backwards compatibility. Information about Turkic-specific code points is |
915 | now returned. |
916 | |
917 | The documentation has been corrected and expanded. |
918 | |
919 | =item C<UNIVERSAL> |
920 | |
921 | Upgraded from version 1.04 to 1.05. |
922 | |
923 | =item C<Win32> |
924 | |
925 | Upgraded from version 0.34 to 0.39. |
926 | |
927 | =item C<Win32API::File> |
928 | |
929 | Upgraded from version 0.1001_01 to 0.1101. |
930 | |
931 | =item C<XSLoader> |
932 | |
933 | Upgraded from version 0.08 to 0.10. |
934 | |
935 | =back |
936 | |
937 | =head1 Utility Changes |
938 | |
939 | =over 4 |
940 | |
941 | =item F<h2ph> |
942 | |
943 | Now looks in C<include-fixed> too, which is a recent addition to gcc's |
944 | search path. |
945 | |
946 | =item F<h2xs> |
947 | |
948 | No longer incorrectly treats enum values like macros (Daniel Burr). |
949 | |
950 | Now handles C++ style constants (C<//>) properly in enums. (A patch from |
951 | Rainer Weikusat was used; Daniel Burr also proposed a similar fix). |
952 | |
953 | =item F<perl5db.pl> |
954 | |
955 | C<LVALUE> subroutines now work under the debugger. |
956 | |
957 | The debugger now correctly handles proxy constant subroutines, and |
958 | subroutine stubs. |
959 | |
960 | =item F<perlthanks> |
961 | |
962 | Perl 5.10.1 adds a new utility F<perlthanks>, which is a variant of |
963 | F<perlbug>, but for sending non-bug-reports to the authors and maintainers |
964 | of Perl. Getting nothing but bug reports can become a bit demoralising: |
965 | we'll see if this changes things. |
966 | |
967 | =back |
968 | |
969 | =head1 New Documentation |
970 | |
971 | =over 4 |
972 | |
973 | =item L<perlhaiku> |
974 | |
975 | This contains instructions on how to build perl for the Haiku platform. |
976 | |
977 | =item L<perlmroapi> |
978 | |
979 | This describes the new interface for pluggable Method Resolution Orders. |
980 | |
981 | =item L<perlperf> |
982 | |
983 | This document, by Richard Foley, provides an introduction to the use of |
984 | performance and optimization techniques which can be used with particular |
985 | reference to perl programs. |
986 | |
987 | =item L<perlrepository> |
988 | |
989 | This describes how to access the perl source using the I<git> version |
990 | control system. |
991 | |
992 | =item L<perlthanks> |
993 | |
994 | This describes the new F<perlthanks> utility. |
995 | |
996 | =back |
997 | |
998 | =head1 Changes to Existing Documentation |
999 | |
1000 | The various large C<Changes*> files (which listed every change made to perl |
1001 | over the last 18 years) have been removed, and replaced by a small file, |
1002 | also called C<Changes>, which just explains how that same information may |
1003 | be extracted from the git version control system. |
1004 | |
1005 | The file F<Porting/patching.pod> has been deleted, as it mainly described |
1006 | interacting with the old Perforce-based repository, which is now obsolete. |
1007 | Information still relevant has been moved to L<perlrepository>. |
1008 | |
1009 | L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all |
1010 | generated at build time, rather than being shipped as part of the release. |
1011 | |
1012 | =head1 Performance Enhancements |
1013 | |
1014 | =over 4 |
1015 | |
1016 | =item * |
1017 | |
1018 | A new internal cache means that C<isa()> will often be faster. |
1019 | |
1020 | =item * |
1021 | |
1022 | Under C<use locale>, the locale-relevant information is now cached on |
1023 | read-only values, such as the list returned by C<keys %hash>. This makes |
1024 | operations such as C<sort keys %hash> in the scope of C<use locale> much |
1025 | faster. |
1026 | |
1027 | =item * |
1028 | |
1029 | Empty C<DESTROY> methods are no longer called. |
1030 | |
1031 | =back |
1032 | |
1033 | =head1 Installation and Configuration Improvements |
1034 | |
1035 | =head2 F<ext/> reorganisation |
1036 | |
1037 | The layout of directories in F<ext> has been revised. Specifically, all |
1038 | extensions are now flat, and at the top level, with C</> in pathnames |
1039 | replaced by C<->, so that F<ext/Data/Dumper/> is now F<ext/Data-Dumper/>, |
1040 | etc. The names of the extensions as specified to F<Configure>, and as |
1041 | reported by C<%Config::Config> under the keys C<dynamic_ext>, |
1042 | C<known_extensions>, C<nonxs_ext> and C<static_ext> have not changed, and |
1043 | still use C</>. Hence this change will not have any affect once perl is |
1044 | installed. However, C<Attribute::Handlers>, C<Safe> and C<mro> have now |
1045 | become extensions in their own right, so if you run F<Configure> with |
1046 | options to specify an exact list of extensions to build, you will need to |
1047 | change it to account for this. |
1048 | |
1049 | For 5.10.2, it is planned that many dual-life modules will have been moved |
1050 | from F<lib> to F<ext>; again this will have no effect on an installed |
1051 | perl, but will matter if you invoke F<Configure> with a pre-canned list of |
1052 | extensions to build. |
1053 | |
1054 | =head2 Configuration improvements |
1055 | |
1056 | If C<vendorlib> and C<vendorarch> are the same, then they are only added to |
1057 | C<@INC> once. |
1058 | |
1059 | C<$Config{usedevel}> and the C-level C<PERL_USE_DEVEL> are now defined if |
1060 | perl is built with C<-Dusedevel>. |
1061 | |
1062 | F<Configure> will enable use of C<-fstack-protector>, to provide protection |
1063 | against stack-smashing attacks, if the compiler supports it. |
1064 | |
1065 | F<Configure> will now determine the correct prototypes for re-entrant |
1066 | functions, and for C<gconvert>, if you are using a C++ compiler rather |
1067 | than a C compiler. |
1068 | |
1069 | On Unix, if you build from a tree containing a git repository, the |
1070 | configuration process will note the commit hash you have checked out, for |
1071 | display in the output of C<perl -v> and C<perl -V>. Unpushed local commits |
1072 | are automatically added to the list of local patches displayed by |
1073 | C<perl -V>. |
1074 | |
1075 | =head2 Compilation improvements |
1076 | |
1077 | As part of the flattening of F<ext>, all extensions on all platforms are |
1078 | built by F<make_ext.pl>. This replaces the Unix-specific |
1079 | F<ext/util/make_ext>, VMS-specific F<make_ext.com> and Win32-specific |
1080 | F<win32/buildext.pl>. |
1081 | |
1082 | =head2 Platform Specific Changes |
1083 | |
1084 | =over 4 |
1085 | |
1086 | =item AIX |
1087 | |
1088 | Removed F<libbsd> for AIX 5L and 6.1. Only flock() was used from F<libbsd>. |
1089 | |
1090 | Removed F<libgdbm> for AIX 5L and 6.1. The F<libgdbm> is delivered as an |
1091 | optional package with the AIX Toolbox. Unfortunately the 64 bit version |
1092 | is broken. |
1093 | |
1094 | Hints changes mean that AIX 4.2 should work again. |
1095 | |
1096 | =item Cygwin |
1097 | |
1098 | On Cygwin we now strip the last number from the DLL. This has been the |
1099 | behaviour in the cygwin.com build for years. The hints files have been |
1100 | updated. |
1101 | |
1102 | =item FreeBSD |
1103 | |
1104 | The hints files now identify the correct threading libraries on FreeBSD 7 |
1105 | and later. |
1106 | |
1107 | =item Irix |
1108 | |
1109 | We now work around a bizarre preprocessor bug in the Irix 6.5 compiler: |
1110 | C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't. |
1111 | |
1112 | =item Haiku |
1113 | |
1114 | Patches from the Haiku maintainers have been merged in. Perl should now |
1115 | build on Haiku. |
1116 | |
1117 | =item MirOS BSD |
1118 | |
1119 | Perl should now build on MirOS BSD. |
1120 | |
1121 | =item NetBSD |
1122 | |
1123 | Hints now supports versions 5.*. |
1124 | |
1125 | =item Stratus VOS |
1126 | |
1127 | Various changes from Stratus have been merged in. |
1128 | |
1129 | =item Symbian |
1130 | |
1131 | There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK. |
1132 | |
1133 | =item Win32 |
1134 | |
1135 | Improved message window handling means that C<alarm> and C<kill> messages |
1136 | will no longer be dropped under race conditions. |
1137 | |
1138 | =item VMS |
1139 | |
1140 | Reads from the in-memory temporary files of C<PerlIO::scalar> used to fail |
1141 | if C<$/> was set to a numeric reference (to indicate record-style reads). |
1142 | This is now fixed. |
1143 | |
1144 | VMS now supports C<getgrgid>. |
1145 | |
1146 | Many improvements and cleanups have been made to the VMS file name handling |
1147 | and conversion code. |
1148 | |
1149 | Enabling the C<PERL_VMS_POSIX_EXIT> logical name now encodes a POSIX exit |
1150 | status in a VMS condition value for better interaction with GNV's bash |
1151 | shell and other utilities that depend on POSIX exit values. See |
1152 | L<perlvms/"$?"> for details. |
1153 | |
1154 | =back |
1155 | |
1156 | =head1 Selected Bug Fixes |
1157 | |
1158 | =over 4 |
1159 | |
1160 | =item |
1161 | |
1162 | =item C<-I> on shebang line now adds directories in front of @INC. |
1163 | as documented, and as does C<-I> when specified on the command-line. |
1164 | (Renée Bäcker) |
1165 | |
1166 | =item |
1167 | |
1168 | * C<kill> is now fatal when called on non-numeric process identifiers. |
1169 | Previously, an 'undef' process identifier would be interpreted as a request to |
1170 | kill process "0", which would terminate the current process group on POSIX |
1171 | systems. Since process identifiers are always integers, killing a non-numeric |
1172 | process is now fatal. |
1173 | |
1174 | =item * |
1175 | |
1176 | 5.10.0 inadvertently disabled an optimisation, which caused a measurable |
1177 | performance drop in list assignment, such as is often used to assign |
1178 | function parameters from C<@_>. The optimisation has been re-instated, and |
1179 | the performance regression fixed. |
1180 | |
1181 | =item * |
1182 | |
1183 | Fixed memory leak on C<while (1) { map 1, 1 }> [RT #53038]. |
1184 | |
1185 | =item * |
1186 | |
1187 | Some potential coredumps in PerlIO fixed [RT #57322,54828]. |
1188 | |
1189 | =item * |
1190 | |
1191 | The debugger now works with lvalue subroutines. |
1192 | |
1193 | =item * |
1194 | |
1195 | The debugger's C<m> command was broken on modules that defined constants |
1196 | [RT #61222]. |
1197 | |
1198 | =item * |
1199 | |
1200 | C<crypt()> and string complement could return tainted values for untainted |
1201 | arguments [RT #59998]. |
1202 | |
1203 | =item * |
1204 | |
1205 | The C<-i.suffix> command-line switch now recreates the file using |
1206 | restricted permissions, before changing its mode to match the original |
1207 | file. This eliminates a potential race condition [RT #60904]. |
1208 | |
1209 | =item * |
1210 | |
1211 | On some UNIX systems, the value in C<$?> would not have the top bit set |
1212 | (C<$? & 128>) even if the child core dumped. |
1213 | |
1214 | =item * |
1215 | |
1216 | Under some circumstances, $^R could incorrectly become undefined |
1217 | [RT #57042]. |
1218 | |
1219 | =item * |
1220 | |
1221 | (XS) In various hash functions, passing a pre-computed hash to when the |
1222 | key is UTF-8 might result in an incorrect lookup. |
1223 | |
1224 | =item * |
1225 | |
1226 | (XS) Including F<XSUB.h> before F<perl.h> gave a compile-time error |
1227 | [RT #57176]. |
1228 | |
1229 | =item * |
1230 | |
1231 | C<< $object->isa('Foo') >> would report false if the package C<Foo> didn't |
1232 | exist, even if the object's C<@ISA> contained C<Foo>. |
1233 | |
1234 | =item * |
1235 | |
1236 | Various bugs in the new-to 5.10.0 mro code, triggered by manipulating |
1237 | C<@ISA>, have been found and fixed. |
1238 | |
1239 | =item * |
1240 | |
1241 | Bitwise operations on references could crash the interpreter, e.g. |
1242 | C<$x=\$y; $x |= "foo"> [RT #54956]. |
1243 | |
1244 | =item * |
1245 | |
1246 | Patterns including alternation might be sensitive to the internal UTF-8 |
1247 | representation, e.g. |
1248 | |
1249 | my $byte = chr(192); |
1250 | my $utf8 = chr(192); utf8::upgrade($utf8); |
1251 | $utf8 =~ /$byte|X}/i; # failed in 5.10.0 |
1252 | |
1253 | =item * |
1254 | |
1255 | Within UTF8-encoded Perl source files (i.e. where C<use utf8> is in |
1256 | effect), double-quoted literal strings could be corrupted where a C<\xNN>, |
1257 | C<\0NNN> or C<\N{}> is followed by a literal character with ordinal value |
1258 | greater than 255 [RT #59908]. |
1259 | |
1260 | =item * |
1261 | |
1262 | C<B::Deparse> failed to correctly deparse various constructs: |
1263 | C<readpipe STRING> [RT #62428], C<CORE::require(STRING)> [RT #62488], |
1264 | C<sub foo(_)> [RT #62484]. |
1265 | |
1266 | =item * |
1267 | |
1268 | Using C<setpgrp()> with no arguments could corrupt the perl stack. |
1269 | |
1270 | =item * |
1271 | |
1272 | The block form of C<eval> is now specifically trappable by C<Safe> and |
1273 | C<ops>. Previously it was erroneously treated like string C<eval>. |
1274 | |
1275 | =item * |
1276 | |
1277 | In 5.10.0, the two characters C<[~> were sometimes parsed as the smart |
1278 | match operator (C<~~>) [RT #63854]. |
1279 | |
1280 | =item * |
1281 | |
1282 | In 5.10.0, the C<*> quantifier in patterns was sometimes treated as |
1283 | C<{0,32767}> [RT #60034, #60464]. For example, this match would fail: |
1284 | |
1285 | ("ab" x 32768) =~ /^(ab)*$/ |
1286 | |
1287 | =item * |
1288 | |
1289 | C<shmget> was limited to a 32 bit segment size on a 64 bit OS [RT #63924]. |
1290 | |
1291 | =item * |
1292 | |
1293 | Using C<next> or C<last> to exit a C<given> block no longer produces a |
1294 | spurious warning like the following: |
1295 | |
1296 | Exiting given via last at foo.pl line 123 |
1297 | |
1298 | =item * |
1299 | |
1300 | On Windows, C<'.\foo'> and C<'..\foo'> were treated differently than |
1301 | C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492]. |
1302 | |
1303 | =item * |
1304 | |
1305 | Assigning a format to a glob could corrupt the format; e.g.: |
1306 | |
1307 | *bar=*foo{FORMAT}; # foo format now bad |
1308 | |
1309 | =item * |
1310 | |
1311 | Attempting to coerce a typeglob to a string or number could cause an |
1312 | assertion failure. The correct error message is now generated, |
1313 | C<Can't coerce GLOB to I<$type>>. |
1314 | |
1315 | =item * |
1316 | |
1317 | Under C<use filetest 'access'>, C<-x> was using the wrong access mode. This |
1318 | has been fixed [RT #49003]. |
1319 | |
1320 | =item * |
1321 | |
1322 | C<length> on a tied scalar that returned a Unicode value would not be |
1323 | correct the first time. This has been fixed. |
1324 | |
1325 | =item * |
1326 | |
1327 | Using an array C<tie> inside in array C<tie> could SEGV. This has been |
1328 | fixed. [RT #51636] |
1329 | |
1330 | =item * |
1331 | |
1332 | A race condition inside C<PerlIOStdio_close()> has been identified and |
1333 | fixed. This used to cause various threading issues, including SEGVs. |
1334 | |
1335 | =item * |
1336 | |
1337 | In C<unpack>, the use of C<()> groups in scalar context was internally |
1338 | placing a list on the interpreter's stack, which manifested in various |
1339 | ways, including SEGVs. This is now fixed [RT #50256]. |
1340 | |
1341 | =item * |
1342 | |
1343 | Magic was called twice in C<substr>, C<\&$x>, C<tie $x, $m> and C<chop>. |
1344 | These have all been fixed. |
1345 | |
1346 | =item * |
1347 | |
1348 | A 5.10.0 optimisation to clear the temporary stack within the implicit |
1349 | loop of C<s///ge> has been reverted, as it turned out to be the cause of |
1350 | obscure bugs in seemingly unrelated parts of the interpreter [commit |
1351 | ef0d4e17921ee3de]. |
1352 | |
1353 | =item * |
1354 | |
1355 | The line numbers for warnings inside C<elsif> are now correct. |
1356 | |
1357 | =item * |
1358 | |
1359 | The C<..> operator now works correctly with ranges whose ends are at or |
1360 | close to the values of the smallest and largest integers. |
1361 | |
1362 | =item * |
1363 | |
1364 | C<binmode STDIN, ':raw'> could lead to segmentation faults on some platforms. |
1365 | This has been fixed [RT #54828]. |
1366 | |
1367 | =item * |
1368 | |
1369 | An off-by-one error meant that C<index $str, ...> was effectively being |
1370 | executed as C<index "$str\0", ...>. This has been fixed [RT #53746]. |
1371 | |
1372 | =item * |
1373 | |
1374 | Various leaks associated with named captures in regexes have been fixed |
1375 | [RT #57024]. |
1376 | |
1377 | =item * |
1378 | |
1379 | A weak reference to a hash would leak. This was affecting C<DBI> |
1380 | [RT #56908]. |
1381 | |
1382 | =item * |
1383 | |
1384 | Using (?|) in a regex could cause a segfault [RT #59734]. |
1385 | |
1386 | =item * |
1387 | |
1388 | Use of a UTF-8 C<tr//> within a closure could cause a segfault [RT #61520]. |
1389 | |
1390 | =item * |
1391 | |
1392 | Calling C<sv_chop()> or otherwise upgrading an SV could result in an |
1393 | unaligned 64-bit access on the SPARC architecture [RT #60574]. |
1394 | |
1395 | =item * |
1396 | |
1397 | In the 5.10.0 release, C<inc_version_list> would incorrectly list |
1398 | C<5.10.*> after C<5.8.*>; this affected the C<@INC> search order |
1399 | [RT #67628]. |
1400 | |
1401 | =item * |
1402 | |
1403 | In 5.10.0, C<pack "a*", $tainted_value> returned a non-tainted value |
1404 | [RT #52552]. |
1405 | |
1406 | =item * |
1407 | |
1408 | In 5.10.0, C<printf> and C<sprintf> could produce the fatal error |
1409 | C<panic: utf8_mg_pos_cache_update> when printing UTF-8 strings |
1410 | [RT #62666]. |
1411 | |
1412 | =item * |
1413 | |
1414 | In the 5.10.0 release, a dynamically created C<AUTOLOAD> method might be |
1415 | missed (method cache issue) [RT #60220,60232]. |
1416 | |
1417 | =item * |
1418 | |
1419 | In the 5.10.0 release, a combination of C<use feature> and C<//ee> could |
1420 | cause a memory leak [RT #63110]. |
1421 | |
1422 | =item * |
1423 | |
1424 | C<-C> on the shebang (C<#!>) line is once more permitted if it is also |
1425 | specified on the command line. C<-C> on the shebang line used to be a |
1426 | silent no-op I<if> it was not also on the command line, so perl 5.10.0 |
1427 | disallowed it, which broke some scripts. Now perl checks whether it is |
1428 | also on the command line and only dies if it is not [RT #67880]. |
1429 | |
1430 | =item * |
1431 | |
1432 | In 5.10.0, certain types of re-entrant regular expression could crash, |
1433 | or cause the following assertion failure [RT #60508]: |
1434 | |
1435 | Assertion rx->sublen >= (s - rx->subbeg) + i failed |
1436 | |
1437 | |
1438 | =back |
1439 | |
1440 | =head1 New or Changed Diagnostics |
1441 | |
1442 | =over 4 |
1443 | |
1444 | =item C<panic: sv_chop %s> |
1445 | |
1446 | This new fatal error occurs when the C routine C<Perl_sv_chop()> was |
1447 | passed a position that is not within the scalar's string buffer. This |
1448 | could be caused by buggy XS code, and at this point recovery is not |
1449 | possible. |
1450 | |
1451 | =item C<Can't locate package %s for the parents of %s> |
1452 | |
1453 | This warning has been removed. In general, it only got produced in |
1454 | conjunction with other warnings, and removing it allowed an ISA lookup |
1455 | optimisation to be added. |
1456 | |
1457 | =item C<v-string in use/require is non-portable> |
1458 | |
1459 | This warning has been removed. |
1460 | |
1461 | =item C<Deep recursion on subroutine "%s"> |
1462 | |
1463 | It is now possible to change the depth threshold for this warning from the |
1464 | default of 100, by recompiling the F<perl> binary, setting the C |
1465 | pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value. |
1466 | |
1467 | =back |
1468 | |
1469 | =head1 Changed Internals |
1470 | |
1471 | =over 4 |
1472 | |
1473 | =item * |
1474 | |
1475 | The J.R.R. Tolkien quotes at the head of C source file have been checked and |
1476 | proper citations added, thanks to a patch from Tom Christiansen. |
1477 | |
1478 | =item * |
1479 | |
1480 | C<vcroak()> now accepts a null first argument. In addition, a full audit |
1481 | was made of the "not NULL" compiler annotations, and those for several |
1482 | other internal functions were corrected. |
1483 | |
1484 | =item * |
1485 | |
1486 | New macros C<dSAVEDERRNO>, C<dSAVE_ERRNO>, C<SAVE_ERRNO>, C<RESTORE_ERRNO> |
1487 | have been added to formalise the temporary saving of the C<errno> |
1488 | variable. |
1489 | |
1490 | =item * |
1491 | |
1492 | The function C<Perl_sv_insert_flags> has been added to augment |
1493 | C<Perl_sv_insert>. |
1494 | |
1495 | =item * |
1496 | |
1497 | The function C<Perl_newSV_type(type)> has been added, equivalent to |
1498 | C<Perl_newSV()> followed by C<Perl_sv_upgrade(type)>. |
1499 | |
1500 | =item * |
1501 | |
1502 | The function C<Perl_newSVpvn_flags()> has been added, equivalent to |
1503 | C<Perl_newSVpvn()> and then performing the action relevant to the flag. |
1504 | |
1505 | Two flag bits are currently supported. |
1506 | |
1507 | =over 4 |
1508 | |
1509 | =item C<SVf_UTF8> |
1510 | |
1511 | This will call C<SvUTF8_on()> for you. (Note that this does not convert an |
1512 | sequence of ISO 8859-1 characters to UTF-8). A wrapper, C<newSVpvn_utf8()> |
1513 | is available for this. |
1514 | |
1515 | =item C<SVs_TEMP> |
1516 | |
1517 | Call C<sv_2mortal()> on the new SV. |
1518 | |
1519 | =back |
1520 | |
1521 | There is also a wrapper that takes constant strings, C<newSVpvs_flags()>. |
1522 | |
1523 | =item * |
1524 | |
1525 | The function C<Perl_croak_xs_usage> has been added as a wrapper to |
1526 | C<Perl_croak>. |
1527 | |
1528 | =item * |
1529 | |
1530 | The functions C<PerlIO_find_layer> and C<PerlIO_list_alloc> are now |
1531 | exported. |
1532 | |
1533 | =item * |
1534 | |
1535 | C<PL_na> has been exterminated from the core code, replaced by local STRLEN |
1536 | temporaries, or C<*_nolen()> calls. Either approach is faster than C<PL_na>, |
1537 | which is a pointer deference into the interpreter structure under ithreads, |
1538 | and a global variable otherwise. |
1539 | |
1540 | =item * |
1541 | |
1542 | C<Perl_mg_free()> used to leave freed memory accessible via SvMAGIC() on |
1543 | the scalar. It now updates the linked list to remove each piece of magic |
1544 | as it is freed. |
1545 | |
1546 | =item * |
1547 | |
1548 | Under ithreads, the regex in C<PL_reg_curpm> is now reference counted. This |
1549 | eliminates a lot of hackish workarounds to cope with it not being reference |
1550 | counted. |
1551 | |
1552 | =item * |
1553 | |
1554 | C<Perl_mg_magical()> would sometimes incorrectly turn on C<SvRMAGICAL()>. |
1555 | This has been fixed. |
1556 | |
1557 | =item * |
1558 | |
1559 | The I<public> IV and NV flags are now not set if the string value has |
1560 | trailing "garbage". This behaviour is consistent with not setting the |
1561 | public IV or NV flags if the value is out of range for the type. |
1562 | |
1563 | =item * |
1564 | |
1565 | SV allocation tracing has been added to the diagnostics enabled by C<-Dm>. |
1566 | The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if |
1567 | that was enabled when the F<perl> binary was compiled. |
1568 | |
1569 | =item * |
1570 | |
1571 | Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have been |
1572 | replaced by C<NULL> in the core code, and non-dual-life modules, as C<NULL> |
1573 | is clearer to those unfamiliar with the core code. |
1574 | |
1575 | =item * |
1576 | |
1577 | A macro C<MUTABLE_PTR(p)> has been added, which on (non-pedantic) gcc will |
1578 | not cast away C<const>, returning a C<void *>. Macros C<MUTABLE_SV(av)>, |
1579 | C<MUTABLE_SV(cv)> etc build on this, casting to C<AV *> etc without |
1580 | casting away C<const>. This allows proper compile-time auditing of |
1581 | C<const> correctness in the core, and helped picked up some errors (now |
1582 | fixed). |
1583 | |
1584 | =item * |
1585 | |
1586 | Macros C<mPUSHs()> and C<mXPUSHs()> have been added, for pushing SVs on the |
1587 | stack and mortalizing them. |
1588 | |
1589 | =item * |
1590 | |
1591 | Use of the private structure C<mro_meta> has changed slightly. Nothing |
1592 | outside the core should be accessing this directly anyway. |
1593 | |
1594 | =item * |
1595 | |
1596 | A new tool, C<Porting/expand-macro.pl> has been added, that allows you |
1597 | to view how a C preprocessor macro would be expanded when compiled. |
1598 | This is handy when trying to decode the macro hell that is the perl |
1599 | guts. |
1600 | |
1601 | =back |
1602 | |
1603 | =head1 New Tests |
1604 | |
1605 | Many modules updated from CPAN incorporate new tests. |
1606 | |
1607 | Several tests that have the potential to hang forever if they fail now |
1608 | incorporate a "watchdog" functionality that will kill them after a timeout, |
1609 | which helps ensure that C<make test> and C<make test_harness> run to |
1610 | completion automatically. (Jerry Hedden). |
1611 | |
1612 | Some core-specific tests have been added: |
1613 | |
1614 | =over 4 |
1615 | |
1616 | =item t/comp/retainedlines.t |
1617 | |
1618 | Check that the debugger can retain source lines from C<eval>. |
1619 | |
1620 | =item t/io/perlio_fail.t |
1621 | |
1622 | Check that bad layers fail. |
1623 | |
1624 | =item t/io/perlio_leaks.t |
1625 | |
1626 | Check that PerlIO layers are not leaking. |
1627 | |
1628 | =item t/io/perlio_open.t |
1629 | |
1630 | Check that certain special forms of open work. |
1631 | |
1632 | =item t/io/perlio.t |
1633 | |
1634 | General PerlIO tests. |
1635 | |
1636 | =item t/io/pvbm.t |
1637 | |
1638 | Check that there is no unexpected interaction between the internal types |
1639 | C<PVBM> and C<PVGV>. |
1640 | |
1641 | =item t/mro/package_aliases.t |
1642 | |
1643 | Check that mro works properly in the presence of aliased packages. |
1644 | |
1645 | =item t/op/dbm.t |
1646 | |
1647 | Tests for C<dbmopen> and C<dbmclose>. |
1648 | |
1649 | =item t/op/index_thr.t |
1650 | |
1651 | Tests for the interaction of C<index> and threads. |
1652 | |
1653 | =item t/op/pat_thr.t |
1654 | |
1655 | Tests for the interaction of esoteric patterns and threads. |
1656 | |
1657 | =item t/op/qr_gc.t |
1658 | |
1659 | Test that C<qr> doesn't leak. |
1660 | |
1661 | =item t/op/reg_email_thr.t |
1662 | |
1663 | Tests for the interaction of regex recursion and threads. |
1664 | |
1665 | =item t/op/regexp_qr_embed_thr.t |
1666 | |
1667 | Tests for the interaction of patterns with embedded C<qr//> and threads. |
1668 | |
1669 | =item t/op/regexp_unicode_prop.t |
1670 | |
1671 | Tests for Unicode properties in regular expressions. |
1672 | |
1673 | =item t/op/regexp_unicode_prop_thr.t |
1674 | |
1675 | Tests for the interaction of Unicode properties and threads. |
1676 | |
1677 | =item t/op/reg_nc_tie.t |
1678 | |
1679 | Test the tied methods of C<Tie::Hash::NamedCapture>. |
1680 | |
1681 | =item t/op/reg_posixcc.t |
1682 | |
1683 | Check that POSIX character classes behave consistently. |
1684 | |
1685 | =item t/op/re.t |
1686 | |
1687 | Check that exportable C<re> functions in F<universal.c> work. |
1688 | |
1689 | =item t/op/setpgrpstack.t |
1690 | |
1691 | Check that C<setpgrp> works. |
1692 | |
1693 | =item t/op/substr_thr.t |
1694 | |
1695 | Tests for the interaction of C<substr> and threads. |
1696 | |
1697 | =item t/op/upgrade.t |
1698 | |
1699 | Check that upgrading and assigning scalars works. |
1700 | |
1701 | =item t/uni/lex_utf8.t |
1702 | |
1703 | Check that Unicode in the lexer works. |
1704 | |
1705 | =item t/uni/tie.t |
1706 | |
1707 | Check that Unicode and C<tie> work. |
1708 | |
1709 | =back |
1710 | |
1711 | =head1 Known Problems |
1712 | |
1713 | This is a list of some significant unfixed bugs, which are regressions |
1714 | from either 5.10.0 or 5.8.x. |
1715 | |
1716 | =over 4 |
1717 | |
1718 | =item * |
1719 | |
1720 | C<List::Util::first> misbehaves in the presence of a lexical C<$_> |
1721 | (typically introduced by C<my $_> or implicitly by C<given>). The variable |
1722 | which gets set for each iteration is the package variable C<$_>, not the |
1723 | lexical C<$_> [RT #67694]. |
1724 | |
1725 | A similar issue may occur in other modules that provide functions which |
1726 | take a block as their first argument, like |
1727 | |
1728 | foo { ... $_ ...} list |
1729 | |
1730 | =item * |
1731 | |
1732 | The C<charnames> pragma may generate a run-time error when a regex is |
1733 | interpolated [RT #56444]: |
1734 | |
1735 | use charnames ':full'; |
1736 | my $r1 = qr/\N{THAI CHARACTER SARA I}/; |
1737 | "foo" =~ $r1; # okay |
1738 | "foo" =~ /$r1+/; # runtime error |
1739 | |
1740 | A workaround is to generate the character outside of the regex: |
1741 | |
1742 | my $a = "\N{THAI CHARACTER SARA I}"; |
1743 | my $r1 = qr/$a/; |
1744 | |
1745 | =item * |
1746 | |
1747 | Some regexes may run much more slowly when run in a child thread compared |
1748 | with the thread the pattern was compiled into [RT #55600]. |
1749 | |
1750 | |
1751 | =back |
1752 | |
1753 | =head1 Deprecations |
1754 | |
1755 | The following items are now deprecated. |
1756 | |
1757 | =over 4 |
1758 | |
1759 | =item * |
1760 | |
1761 | C<Switch> is buggy and should be avoided. From perl 5.11.0 onwards, it is |
1762 | intended that any use of the core version of this module will emit a |
1763 | warning, and that the module will eventually be removed from the core |
1764 | (probably in perl 5.14.0). See L<perlsyn/"Switch statements"> for its |
1765 | replacement. |
1766 | |
1767 | =item * |
1768 | |
1769 | C<suidperl> will be removed in 5.12.0. This provides a mechanism to |
1770 | emulate setuid permission bits on systems that don't support it properly. |
1771 | |
1772 | =back |
1773 | |
1774 | =head1 Acknowledgements |
1775 | |
1776 | Some of the work in this release was funded by a TPF grant. |
1777 | |
1778 | Nicholas Clark officially retired from maintenance pumpking duty at the |
1779 | end of 2008; however in reality he has put much effort in since then to |
1780 | help get 5.10.1 into a fit state to be released, including writing a |
1781 | considerable chunk of this perldelta. |
1782 | |
1783 | Steffen Mueller and David Golden in particular helped getting CPAN modules |
1784 | polished and synchronised with their in-core equivalents. |
1785 | |
1786 | Craig Berry was tireless in getting maint to run under VMS, no matter how |
1787 | many times we broke it for him. |
1788 | |
1789 | The other core committers contributed most of the changes, and applied most |
1790 | of the patches sent in by the hundreds of contributors listed in F<AUTHORS>. |
7120b314 |
1791 | |
5a00ee6a |
1792 | Finally, thanks to Larry Wall, without whom none of this would be |
1793 | necessary. |
7120b314 |
1794 | |
1795 | =head1 Reporting Bugs |
1796 | |
1797 | If you find what you think is a bug, you might check the articles |
1798 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
5a00ee6a |
1799 | bug database at http://rt.perl.org/perlbug/ . There may also be |
7120b314 |
1800 | information at http://www.perl.org/ , the Perl Home Page. |
1801 | |
1802 | If you believe you have an unreported bug, please run the B<perlbug> |
1803 | program included with your release. Be sure to trim your bug down |
1804 | to a tiny but sufficient test case. Your bug report, along with the |
1805 | output of C<perl -V>, will be sent off to perlbug@perl.org to be |
1806 | analysed by the Perl porting team. |
1807 | |
49f8307e |
1808 | If the bug you are reporting has security implications, which make it |
1809 | inappropriate to send to a publicly archived mailing list, then please send |
1810 | it to perl5-security-report@perl.org. This points to a closed subscription |
1811 | unarchived mailing list, which includes all the core committers, who be able |
1812 | to help assess the impact of issues, figure out a resolution, and help |
1813 | co-ordinate the release of patches to mitigate or fix the problem across all |
5a00ee6a |
1814 | platforms on which Perl is supported. Please only use this address for |
1815 | security issues in the Perl core, not for modules independently |
1816 | distributed on CPAN. |
49f8307e |
1817 | |
7120b314 |
1818 | =head1 SEE ALSO |
1819 | |
5a00ee6a |
1820 | The F<Changes> file for an explanation of how to view exhaustive details |
1821 | on what changed. |
7120b314 |
1822 | |
1823 | The F<INSTALL> file for how to build Perl. |
1824 | |
1825 | The F<README> file for general stuff. |
1826 | |
1827 | The F<Artistic> and F<Copying> files for copyright information. |
1828 | |
1829 | =cut |