X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperltodo.pod;h=7c7dc96e3ff286fa90f67225dd83019c7c5427f3;hb=e40b81a3dd247b1a29fc78399677b77b78b5f183;hp=c85174e0fb7bc38663285b7ed487e86cc878e232;hpb=65c444ad9fe5f91a61ff1b7dcf47f383cf2a0f8a;p=p5sagit%2Fp5-mst-13.2.git diff --git a/pod/perltodo.pod b/pod/perltodo.pod index c85174e..7c7dc96 100644 --- a/pod/perltodo.pod +++ b/pod/perltodo.pod @@ -25,28 +25,10 @@ programming languages offer you 1 line of immortality? The roadmap to 5.10 envisages feature based releases, as various items in this TODO are completed. -=head2 Needed for a 5.9.5 release +=head2 Needed for the final 5.10.0 release -=over - -=item * - -Review smart match semantics in light of Perl 6 developments. - -=item * - -Review assertions. Review syntax to combine assertions. Assertions could take -advantage of the lexical pragmas work. L - -=item * - -C should be turned into a lexical pragma (probably). - -=back - -=head2 Needed for a 5.9.6 release - -Stabilisation. If all goes well, this will be the equivalent of a 5.10-beta. +Review perlguts. Significant changes have occured since 5.8, and we can't +release a new version without making sure these are covered. =head1 Tasks that only need Perl knowledge @@ -159,6 +141,23 @@ when is duplicated in F. Writing things twice is bad, m'kay. It would be good to teach C to understand the conditional compilation, and hence remove the duplication, and the mistakes it has caused. +=head2 use strict; and AutoLoad + +Currently if you write + + package Whack; + use AutoLoader 'AUTOLOAD'; + use strict; + 1; + __END__ + sub bloop { + print join (' ', No, strict, here), "!\n"; + } + +then C isn't in force within the autoloaded subroutines. It would +be more consistent (and less surprising) to arrange for all lexical pragmas +in force at the __END__ block to be in force within each autoloaded subroutine. + =head1 Tasks that need a little sysadmin-type knowledge Or if you prefer, tasks that you would learn from, and broaden your skills @@ -394,21 +393,35 @@ Currently, numerous functions look virtually, if not completely, identical in both C and C files, which can't be good. +=head2 Use secure CRT functions when building with VC8 on Win32 + +Visual C++ 2005 (VC++ 8.x) deprecated a number of CRT functions on the basis +that they were "unsafe" and introduced differently named secure versions of +them as replacements, e.g. instead of writing + + FILE* f = fopen(__FILE__, "r"); + +one should now write + + FILE* f; + errno_t err = fopen_s(&f, __FILE__, "r"); + +Currently, the warnings about these deprecations have been disabled by adding +-D_CRT_SECURE_NO_DEPRECATE to the CFLAGS. It would be nice to remove that +warning suppressant and actually make use of the new secure CRT functions. + +There is also a similar issue with POSIX CRT function names like fileno having +been deprecated in favour of ISO C++ conformant names like _fileno. These +warnings are also currently suppressed with the compiler option /wd4996. It +might be nice to do as Microsoft suggest here too, although, unlike the secure +functions issue, there is presumably little or no benefit in this case. + =head1 Tasks that need a knowledge of XS These tasks would need C knowledge, and roughly the level of knowledge of the perl API that comes from writing modules that use XS to interface to C. -=head2 shrink Cs - -By removing unused elements and careful re-ordering, the structures for Cs, -Cs, Cs and Cs have recently been shrunk considerably. Cs -probably aren't worth it, as typical programs don't use more than 8, and -(at least) C uses C/C/C on a C, -so it would mean code changes to modules on CPAN. Cs might have some -savings to win. - =head2 autovivification Make all autovivification consistent w.r.t LVALUE/RVALUE and strict/no strict; @@ -442,6 +455,11 @@ L.) Currently the %ENV entries are always byte strings. +=head2 Unicode and glob() + +Currently glob patterns and filenames returned from File::Glob::glob() +are always byte strings. + =head2 use less 'memory' Investigate trade offs to switch out perl's choices on memory usage. @@ -478,11 +496,58 @@ ever creep back to libperl.a. Note, of course, that this will only tell whether B platform is using those naughty interfaces. +=head2 Audit the code for destruction ordering assumptions + +Change 25773 notes + + /* Need to check SvMAGICAL, as during global destruction it may be that + AvARYLEN(av) has been freed before av, and hence the SvANY() pointer + is now part of the linked list of SV heads, rather than pointing to + the original body. */ + /* FIXME - audit the code for other bugs like this one. */ + +adding the C check to + + if (AvARYLEN(av) && SvMAGICAL(AvARYLEN(av))) { + MAGIC *mg = mg_find (AvARYLEN(av), PERL_MAGIC_arylen); + +Go through the core and look for similar assumptions that SVs have particular +types, as all bets are off during global destruction. + +=head2 Extend PerlIO and PerlIO::Scalar + +PerlIO::Scalar doesn't know how to truncate(). Implementing this +would require extending the PerlIO vtable. + +Similarly the PerlIO vtable doesn't know about formats (write()), or +about stat(), or chmod()/chown(), utime(), or flock(). + +(For PerlIO::Scalar it's hard to see what e.g. mode bits or ownership +would mean.) + +PerlIO doesn't do directories or symlinks, either: mkdir(), rmdir(), +opendir(), closedir(), seekdir(), rewinddir(), glob(); symlink(), +readlink(). + +=head2 -C on the #! line + +It should be possible to make -C work correctly if found on the #! line, +given that all perl command line options are strict ASCII, and -C changes +only the interpretation of non-ASCII characters, and not for the script file +handle. To make it work needs some investigation of the ordering of function +calls during startup, and (by implication) a bit of tweaking of that order. + + =head1 Tasks that need a knowledge of the interpreter These tasks would need C knowledge, and knowledge of how the interpreter works, or a willingness to learn. +=head2 Implement $value ~~ 0 .. $range + +It would be nice to extend the syntax of the C<~~> operator to also +understand numeric (and maybe alphanumeric) ranges. + =head2 Attach/detach debugger from running program The old perltodo notes "With C, you can attach the debugger to a running @@ -510,10 +575,6 @@ its performance to be measured, and its bugs to be easily demonstrated. Allow to delete functions. One can already undef them, but they're still in the stash. -=head2 Make readpipe overridable - -so we can override qx// as well. - =head2 optional optimizer Make the peephole optimizer optional. Currently it performs two tasks as @@ -567,6 +628,16 @@ set. The pad API only takes a C pointer, so that's all bytes too. The tokeniser ignores the UTF-8-ness of C, or any SVs returned from source filters. All this could be fixed. +=head2 The yada yada yada operators + +Perl 6's Synopsis 3 says: + +I + +Those would be nice to add to Perl 5. That could be done without new ops. + =head1 Big projects Tasks that will get your name mentioned in the description of the "Highlights @@ -581,6 +652,8 @@ will be greatly appreciated. One bit would be to write the missing code in sv.c:Perl_dirp_dup. +Fix Perl_sv_dup, et al so that threads can return objects. + =head2 iCOW Sarathy and Arthur have a proposal for an improved Copy On Write which @@ -596,36 +669,8 @@ Fix (or rewrite) the implementation of the C closures. This will allow the use of a regex from inside (?{ }), (??{ }) and (?(?{ })|) constructs. -=head2 Add (?YES) (?NO) to regexp enigne - -YES/NO would allow a subpattern to be passed/failed but allow backtracking. -Basically a more efficient (?=), (?!). - -demerphq has this on his todo list - -=head2 Add (?SUCCEED) (?FAIL) to regexp engine - -SUCCEED/FAIL would allow a pattern to be passed/failed but without backtracking. -Thus you could signal that a pattern has matched or not, and return (regardless -that there is more pattern following). - -demerphq has this on his todo list - -=head2 Add (?CUT) (?COMMIT) to regexp engine - -CUT would allow a pattern to say "do not backtrack beyond here". -COMMIT would say match from here or don't, but don't try the pattern from -another starting pattern. - -These correspond to the \v and \V that Jeffrey Friedl mentions in -Mastering Regular Expressions 2nd edition. - -demerphq has this on his todo list - =head2 Add class set operations to regexp engine Apparently these are quite useful. Anyway, Jeffery Friedl wants them. demerphq has this on his todo list, but right at the bottom. - -