X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pod%2Fperltodo.pod;h=23fd3f585d7cceb239dce2feba4341661a582e22;hb=c9e30dd8153632a4205f5780cc54d922f26feb15;hp=1fc0afa57ff40a34313e599e41a0dfa60fcd0b00;hpb=89007cb3b367466c897ea44de3bf589824f66dd6;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/pod/perltodo.pod b/pod/perltodo.pod
index 1fc0afa..23fd3f5 100644
--- a/pod/perltodo.pod
+++ b/pod/perltodo.pod
@@ -27,6 +27,11 @@ it would be a good thing.
 
 Fix (or rewrite) the implementation of the C</(?{...})/> closures.
 
+=head1 A re-entrant regexp engine
+
+This will allow the use of a regex from inside (?{ }), (??{ }) and
+(?(?{ })|) constructs.
+
 =head1 pragmata
 
 =head2 lexical pragmas
@@ -137,6 +142,14 @@ O.pm/B.pm backend framework depends on it.
 
 Make the peephole optimizer optional.
 
+=head2 You WANT *how* many
+
+Currently contexts are void, scalar and list. split has a special mechanism in
+place to pass in the number of return values wanted. It would be useful to
+have a general mechanism for this, backwards compatible and little speed hit.
+This would allow proposals such as short circuiting sort to be implemented
+as a module on CPAN.
+
 =head2 lexical aliases
 
 Allow lexical aliases (maybe via the syntax C<my \$alias = \$foo>.
@@ -171,11 +184,6 @@ Clean these up. Move them to mathom.c, and don't compile for blead?
 The old perltodo notes "This has been done in places, but needs a thorough
 code review. Also fchdir is available in some platforms."
 
-=head2 foreach reverse
-
-The old perltodo notes that we could optimise foreach to iterate in reverse.
-(instead of making a reversed copy on the stack)
-
 =head1 Tests
 
 =head2 Make Schwern poorer
@@ -267,7 +275,7 @@ for example POSIX passes Exporter some very memory hungry data structures.
 
 =head2 Optimize away @_
 
-The old perltodo notes "Look at the "reification" code in C<av.c>"
+The old perltodo notes "Look at the "reification" code in C<av.c>".
 
 =head2 switch ops
 
@@ -275,10 +283,23 @@ The old perltodo notes "Although we have C<Switch.pm> in core, Larry points to
 the dormant C<nswitch> and C<cswitch> ops in F<pp.c>; using these opcodes would
 be much faster."
 
-** Attach/detach debugger from running program
+=head2 Attach/detach debugger from running program
 
 The old perltodo notes "With C<gdb>, you can attach the debugger to a running
 program if you pass the process ID. It would be good to do this with the Perl
 debugger on a running Perl program, although I'm not sure how it would be done."
 ssh and screen do this with named pipes in tmp. Maybe we can too.
 
+=head2 A decent benchmark
+
+perlbench seems impervious to any recent changes made to the perl core. It would
+be useful to have a reasonable general benchmarking suite that roughly
+represented what current perl programs do, and measurably reported whether
+tweaks to the core improve, degrade or don't really affect performance, to
+guide people attempting to optimise the guts of perl.
+
+=head2 readpipe(LIST)
+
+system() accepts a LIST syntax (and a PROGRAM LIST syntax) to avoid
+running a shell. readpipe() (the function behind qx//) could be similarly
+extended.