From 1af60bcb794810018aa77e3f4c7d128153067785 Mon Sep 17 00:00:00 2001 From: Rafael Garcia-Suarez Date: Sun, 27 Mar 2005 16:38:13 +0000 Subject: [PATCH] Raw work on perl592delta. p4raw-id: //depot/perl@24087 --- pod/perl592delta.pod | 171 +++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 160 insertions(+), 11 deletions(-) diff --git a/pod/perl592delta.pod b/pod/perl592delta.pod index dd0404a..9e4a72b 100644 --- a/pod/perl592delta.pod +++ b/pod/perl592delta.pod @@ -47,17 +47,60 @@ For consistency, C in unpack() format now trims all Unicode whitespace from the end of the string. Before perl 5.9.2, it used to strip only the classical ASCII space characters. -=head2 The -C option can no longer be used on the #! line +=head2 Miscellaneous -It wasn't working anyway. +The internal dump output has been improved, so that non-printable characters +such as newline and backspace are output in C<\x> notation, rather than +octal. + +The B<-C> option can no longer be used on the C<#!> line. It wasn't +working anyway. =head1 Core Enhancements -=head2 Regexp debug flags +=head2 Malloc wrapping -A new variable, ${^RE_DEBUG_FLAGS}, controls what debug flags are in -effect for the regular expression engine when running under C. See L for details. +Perl can now be built to detect attempts to assign pathologically large chunks +of memory. Previously such assignments would suffer from integer wrap-around +during size calculations causing a misallocation, which would crash perl, and +could theoretically be used for "stack smashing" attacks. The wrapping +defaults to enabled on platforms where we know it works (most AIX +configurations, BSDi, Darwin, DEC OSF/1, FreeBSD, HP/UX, GNU Linux, OpenBSD, +Solaris, VMS and most Win32 compilers) and defaults to disabled on other +platforms. + +=head2 Unicode Character Database 4.0.1 + +The copy of the Unicode Character Database included in Perl 5.9 has +been updated to 4.0.1 from 4.0.0. + +=head2 suidperl less insecure + +Paul Szabo has analysed and patched C to remove existing known +insecurities. Currently there are no known holes in C, but previous +experience shows that we cannot be confident that these were the last. You may +no longer invoke the set uid perl directly, so to preserve backwards +compatibility with scripts that invoke #!/usr/bin/suidperl the only set uid +binary is now CI (C for this release). C +is installed as a hard link to C; both C and C will +invoke C automatically the set uid binary, so this change should +be completely transparent. + +For new projects the core perl team would strongly recommend that you use +dedicated, single purpose security tools such as C in preference to +C. + +=head2 Formats + +In addition to bug fixes, C's features have been enhanced. See +L. + +=head2 Unicode Character Classes + +Perl's regular expression engine now contains support for matching on the +intersection of two Unicode character classes. You can also now refer to +user-defined character classes from within other user defined character +classes. =head2 Byte-order modifiers for pack() and unpack() @@ -66,6 +109,15 @@ There are two new byte-order modifiers, C> (big-endian) and C> characters and groups to force a certain byte-order for that type or group. See L and L for details. +=head2 New variables + +A new variable, ${^RE_DEBUG_FLAGS}, controls what debug flags are in +effect for the regular expression engine when running under C. See L for details. + +A new variable ${^UTF8LOCALE} indicates where an UTF-8 locale was detected +by perl at startup. + =head1 Modules and Pragmata =head2 New modules @@ -82,6 +134,35 @@ comes with a command-line frontend, C. =head2 Updated And Improved Modules and Pragmata +Dual-lived modules have been updated to be kept up-to-date with respect to +CPAN. + +The dual-lived modules which contain an C<_> in their version number are +actually I of the corresponding CPAN release. + +=over 4 + +=item * + +=item B::Concise + +C was significantly improved. + +=item Socket + +There is experimental support for Linux abstract Unix domain sockets. + +=item Sys::Syslog + +C can now use numeric constants for facility names and priorities, +in addition to strings. + +=item threads + +Detached threads are now also supported on Windows. + +=back + =head1 Utility Changes =over 4 @@ -96,30 +177,98 @@ above). C and C have been made a bit more robust with regard to "modern" C code. +=item * + +Several bugs have been fixed in C, regarding C<-exec> and +C<-eval>. Also the options C<-path>, C<-ipath> and C<-iname> have been +added. + +=item * + +The Perl debugger can now save all debugger commands for sourcing later; +notably, it can now emulate stepping backwards, by restarting and +rerunning all bar the last command from a saved command history. + +It can also display the parent inheritance tree of a given class. + +Perl has a new -dt command-line flag, which enables threads support in the +debugger. + =back =head1 Documentation =head1 Performance Enhancements -=head2 Trie optimization for regexp engine +=over 4 + +=item * + +Unicode case mappings (C, C, C, etc) are faster. + +=item * + +C<@a = sort @a> was optimized to do in-place sort. Likewise, C is now optimized to sort in reverse, avoiding the generation of +a temporary intermediate list. + +=item * + +Unnecessary assignment optimised away in + + my $s = undef; + my @a = (); + my %h = (); + +=item * + +Optimised C in scalar context -The regexp engine is now able to factorize common prefixes and suffixes in -regular expressions. A new special variable, ${^RE_TRIE_MAXBUF}, has been -added to fine tune this optimization. +=item * + +The regexp engine now implements the trie optimization : it's able to +factorize common prefixes and suffixes in regular expressions. A new +special variable, ${^RE_TRIE_MAXBUF}, has been added to fine tune this +optimization. + +=back =head1 Installation and Configuration Improvements +There is alpha support for relocatable @INC entries. + +Perl should build on Interix and on GNU/kFreeBSD. + =head1 Selected Bug Fixes +Most of those bugs were reported in the perl 5.8.x maintainance track. +Notably, quite a few utf8 bugs were fixed, and several memory leaks were +suppressed. + +Development-only bug fixes include : + +C<$Foo::_> was wrongly forced as C<$main::_>. + =head1 New or Changed Diagnostics +A new warning, C, is emitted to prevent this misspelling +of the non-matching operator. + The warning I has been removed. The error I has been reformulated to be more descriptive. -There is a new compilation error, I. +There is a new compilation error, I, +for an obscure case of syntax errors. + +The diagnostic output of Carp has been changed slightly, to add a space after +the comma between arguments. This makes it much easier for tools such as +web browsers to wrap it, but might confuse any automatic tools which perform +detailed parsing of Carp output. + +Perl -V has several improvements, making it more useable from shell +scripts. =head1 Changed Internals -- 2.7.4