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1 | =encoding utf8 |
2 | |
3 | =head1 NAME |
4 | |
5 | perldelta - what is new for perl v5.13.2 |
6 | |
7 | =head1 DESCRIPTION |
8 | |
9 | This document describes differences between the 5.13.2 release and |
10 | the 5.13.1 release. |
11 | |
12 | If you are upgrading from an earlier release such as 5.10, first read |
13 | L<perl5120delta>, which describes differences between 5.10 and |
14 | 5.12. |
15 | |
16 | =head1 Notice |
17 | |
18 | XXX Any important notices here |
19 | |
20 | =head1 Incompatible Changes |
21 | |
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22 | =head2 localised tied scalars are tied again. |
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23 | |
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24 | The change in behaviour in 5.13.1 of localising tied scalar values has |
25 | been reverted to the existing 5.12.0 and earlier behaviour (the change for |
26 | arrays and hashes remains). |
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27 | |
28 | =head1 Core Enhancements |
29 | |
30 | XXX New core language features go here. Summarise user-visible core language |
31 | enhancements. Particularly prominent performance optimisations could go |
32 | here, but most should go in the L</Performance Enhancements> section. |
33 | |
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34 | =head2 Non-destructive substitution |
35 | |
36 | The substitution operator now supports a C</r> option that |
37 | copies the input variable, carries out the substitution on |
38 | the copy and returns the result. The original remains unmodified. |
39 | |
40 | my $old = 'cat'; |
41 | my $new = $old =~ s/cat/dog/r; |
42 | # $old is 'cat' and $new is 'dog' |
43 | |
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44 | This is particularly useful with C<map>. See L<perlop> for more examples |
45 | (4f4d75, 000c65). |
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46 | |
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47 | =head2 package block syntax |
48 | |
49 | A package declaration can now contain a code block, in which case the |
50 | declaration is in scope only inside that block. So C<package Foo { ... }> |
51 | is precisely equivalent to C<{ package Foo; ... }>. It also works with |
52 | a version number in the declaration, as in C<package Foo 1.2 { ... }>. |
4baddafe |
53 | See L<perlfunc> (434da3..36f77d, 702646). |
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54 | |
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55 | =head1 New Platforms |
56 | |
57 | XXX List any platforms that this version of perl compiles on, that previous |
58 | versions did not. These will either be enabled by new files in the F<hints/> |
59 | directories, or new subdirectories and F<README> files at the top level of the |
60 | source tree. |
61 | |
62 | =head1 Modules and Pragmata |
63 | |
64 | XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/> |
65 | go here. If Module::CoreList is updated, generate an initial draft of the |
66 | following sections using F<Porting/corelist-perldelta.pl>, which prints stub |
67 | entries to STDOUT. Results can be pasted in place of the '=head2' entries |
68 | below. A paragraph summary for important changes should then be added by hand. |
69 | In an ideal world, dual-life modules would have a F<Changes> file that could be |
70 | cribbed. |
71 | |
72 | =head2 New Modules and Pragmata |
73 | |
74 | =head2 Pragmata Changes |
75 | |
76 | =head2 Updated Modules |
77 | |
78 | =head2 Removed Modules and Pragmata |
79 | |
80 | =head1 Utility Changes |
81 | |
82 | XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go |
83 | here. Most of these are built within the directories F<utils> and F<x2p>. |
84 | |
85 | =over 4 |
86 | |
87 | =item F<XXX> |
88 | |
89 | XXX |
90 | |
91 | =back |
92 | |
93 | =head1 New Documentation |
94 | |
95 | XXX Changes which create B<new> files in F<pod/> go here. |
96 | |
97 | =over 4 |
98 | |
99 | =item L<XXX> |
100 | |
101 | XXX |
102 | |
103 | =back |
104 | |
105 | =head1 Changes to Existing Documentation |
106 | |
107 | XXX Changes which significantly change existing files in F<pod/> go here. |
108 | Any changes to F<pod/perldiag.pod> should go in L</New or Changed Diagnostics>. |
109 | |
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110 | =head2 Replace wrong tr/// table in perlebcdic.pod |
111 | |
112 | perlebcdic.pod contains a helpful table to use in tr/// to convert |
113 | between EBCDIC and Latin1/ASCII. Unfortunately, the table was the |
114 | inverse of the one it describes, though the code that used the table |
115 | worked correctly for the specific example given. |
116 | |
117 | The table has been changed to its inverse, and the sample code changed |
118 | to correspond, as this is easier for the person trying to follow the |
119 | instructions since deriving the old table is somewhat more complicated. |
120 | |
121 | The table has also been changed to hex from octal, as that is more the norm |
122 | these days, and the recipes in the pod altered to print out leading |
123 | zeros to make all the values the same length, as the table that they can |
124 | generate has them. |
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125 | |
126 | =head1 Performance Enhancements |
127 | |
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128 | Multiple small improvements to threads: |
129 | |
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130 | =over 4 |
131 | |
132 | =item * |
133 | |
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134 | Change the internal structured of thread->params from an SV (RV) to an AV |
135 | - so we now pass around and store the array directly, rather than creating, |
136 | holding and dereferencing a reference to it (78b7eff). |
137 | |
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138 | =item * |
139 | |
bd0a6a63 |
140 | Change S_ithread_create() params from a single AV* to a pair of SV** pointers. |
141 | This saves creating, duplicating and freeing and AV, which is only ever used for |
142 | an internal calling convention (4cf5ea). |
143 | |
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144 | =item * |
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145 | |
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146 | Remove redundant hv_exists() calls from ithread_create()'s spec parser (b1faab). |
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147 | |
148 | =item * |
149 | |
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150 | Skip unnecessary newAV() in ithread_create() (39f3f7). |
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151 | |
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152 | =item * |
153 | |
154 | Avoid duping pads created for recursion since there's no point pre-allocating |
155 | the same memory in the new thread (6de654). |
156 | |
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157 | =back |
158 | |
20566cce |
159 | Eliminated xhv_fill from struct xpvhv: This saves 1 IV per hash and on some |
160 | systems will cause struct xpvhv to become cache aligned. To avoid this |
161 | memory saving causing a slowdown elsewhere, boolean use of HvFILL now |
162 | calls HvTOTALKEYS instead (which is equivalent) - so while the fill data when |
163 | actually required is now calculated on demand, the cases when this needs to |
164 | be done should be few and far between (f4431c .. fcd245). |
165 | |
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166 | =head1 Installation and Configuration Improvements |
167 | |
168 | XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools |
169 | go here. |
170 | |
171 | =head2 Configuration improvements |
172 | |
173 | XXX |
174 | |
175 | =head2 Compilation improvements |
176 | |
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177 | Fix CCINCDIR and CCLIBDIR for mingw64 cross compiler to correctly be under |
178 | $(CCHOME)\mingw\include and \lib rather than immediately below $(CCHOME). |
179 | |
180 | This means the 'incpath', 'libpth', 'ldflags', 'lddlflags' and |
181 | 'ldflags_nolargefiles' values in Config.pm and Config_heavy.pl are now |
182 | set correctly (23ae7f). |
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183 | |
184 | =head2 Platform Specific Changes |
185 | |
186 | =over 4 |
187 | |
188 | =item XXX-some-platform |
189 | |
190 | XXX |
191 | |
192 | =back |
193 | |
194 | =head1 Selected Bug Fixes |
195 | |
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196 | Timely cleanup of SVs that are cloned into a new thread but then discovered |
197 | to be orphaned (i.e. their owners are -not- cloned) (e42956) |
198 | |
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199 | Don't accidentally clone lexicals in scope within active stack frames in |
200 | the parent when creating a child thread (RT #73086) (05d04d). |
201 | |
76125158 |
202 | Avoid loading feature.pm when 'no 5.13.2;' or similar is encountered (faee19). |
203 | |
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204 | Trap invalid use of SvIVX on SVt_REGEXP when assertions are on (e77da3) |
205 | |
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206 | =over 4 |
207 | |
208 | =item * |
209 | |
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210 | Overloading now works properly in conjunction with tied variables. What |
211 | formerly happened was that most ops checked their arguments for overloading |
212 | I<before> checking for magic, so for example an overloaded object returned |
213 | by a tied array access would usually be treated as not overloaded |
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214 | (RT #57012) (6f1401, ed3b9b). |
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215 | |
216 | =back |
217 | |
218 | =head1 New or Changed Diagnostics |
219 | |
220 | XXX New or changed warnings emitted by the core's C<C> code go here. |
221 | |
222 | =over 4 |
223 | |
224 | =item C<XXX> |
225 | |
226 | XXX |
227 | |
228 | =back |
229 | |
230 | =head1 Changed Internals |
231 | |
232 | XXX Changes which affect the interface available to C<XS> code go here. |
233 | |
234 | =over 4 |
235 | |
236 | =item * |
237 | |
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238 | The C<find_rundefsvoffset> function has been deprecated. It appeared that |
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239 | its design was insufficient to reliably get the lexical C<$_> at run-time. |
240 | |
241 | Use the new C<find_rundefsv> function or the C<UNDERBAR> macro instead. |
242 | They directly return the right SV representing C<$_>, whether it's lexical |
243 | or dynamic. |
244 | |
245 | =item * |
246 | |
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247 | The following new functions or macros have been added to the public API: |
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248 | C<SvNV_nomg>, C<sv_2nv_flags>, C<find_rundefsv>. |
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249 | |
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250 | =item * |
251 | |
252 | The C<UNDERBAR> macro now calls C<find_rundefsv>. C<dUNDERBAR> is now a |
253 | noop but should still be used to ensure past and future compatibility. |
254 | |
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255 | =back |
256 | |
257 | =head1 New Tests |
258 | |
259 | XXX Changes which create B<new> files in F<t/> go here. Changes to |
260 | existing files in F<t/> aren't worth summarising, although the bugs that |
261 | they represent may be. |
262 | |
263 | =over 4 |
264 | |
265 | =item F<XXX> |
266 | |
267 | XXX |
268 | |
269 | =back |
270 | |
271 | =head1 Known Problems |
272 | |
273 | XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any |
274 | tests that had to be C<TODO>ed for the release would be noted here, unless |
275 | they were specific to a particular platform (see below). |
276 | |
277 | This is a list of some significant unfixed bugs, which are regressions |
278 | from either 5.XXX.XXX or 5.XXX.XXX. |
279 | |
280 | =over 4 |
281 | |
282 | =item * |
283 | |
284 | XXX |
285 | |
286 | =back |
287 | |
288 | =head1 Deprecations |
289 | |
290 | XXX Add any new known deprecations here. |
291 | |
292 | The following items are now deprecated. |
293 | |
294 | =over 4 |
295 | |
296 | =item * |
297 | |
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298 | Omitting a space between a regex pattern or pattern modifiers and the following |
299 | word is deprecated. For example, C<< m/foo/sand $bar >> will still be parsed |
300 | as C<< m/foo/s and $bar >> but will issue a warning. |
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301 | |
302 | =back |
303 | |
304 | =head1 Platform Specific Notes |
305 | |
306 | XXX Any changes specific to a particular platform. VMS and Win32 are the usual |
307 | stars here. It's probably best to group changes under the same section layout |
308 | as the main perldelta |
309 | |
310 | =head1 Obituary |
311 | |
312 | XXX If any significant core contributor has died, we've added a short obituary |
313 | here. |
314 | |
315 | =head1 Acknowledgements |
316 | |
317 | XXX The list of people to thank goes here. |
318 | |
319 | |
320 | =head1 Reporting Bugs |
321 | |
322 | If you find what you think is a bug, you might check the articles |
323 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
324 | bug database at http://rt.perl.org/perlbug/ . There may also be |
325 | information at http://www.perl.org/ , the Perl Home Page. |
326 | |
327 | If you believe you have an unreported bug, please run the B<perlbug> |
328 | program included with your release. Be sure to trim your bug down |
329 | to a tiny but sufficient test case. Your bug report, along with the |
330 | output of C<perl -V>, will be sent off to perlbug@perl.org to be |
331 | analysed by the Perl porting team. |
332 | |
333 | If the bug you are reporting has security implications, which make it |
334 | inappropriate to send to a publicly archived mailing list, then please send |
335 | it to perl5-security-report@perl.org. This points to a closed subscription |
336 | unarchived mailing list, which includes all the core committers, who be able |
337 | to help assess the impact of issues, figure out a resolution, and help |
338 | co-ordinate the release of patches to mitigate or fix the problem across all |
339 | platforms on which Perl is supported. Please only use this address for |
340 | security issues in the Perl core, not for modules independently |
341 | distributed on CPAN. |
342 | |
343 | =head1 SEE ALSO |
344 | |
345 | The F<Changes> file for an explanation of how to view exhaustive details |
346 | on what changed. |
347 | |
348 | The F<INSTALL> file for how to build Perl. |
349 | |
350 | The F<README> file for general stuff. |
351 | |
352 | The F<Artistic> and F<Copying> files for copyright information. |
353 | |
354 | =cut |