X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=Todo;h=2bc1557f16ec8e9957f311f932c261948d6135f3;hb=fcbfa962e80dc16f8db1afaeb5287e8a393d3942;hp=3393a7fdfe706b1c2fc7038c2104d4dc8ad6e23e;hpb=93a17b20b6d176db3f04f51a63b0a781e5ffd11c;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/Todo b/Todo
old mode 100755
new mode 100644
index 3393a7f..2bc1557
--- a/Todo
+++ b/Todo
@@ -1,31 +1,82 @@
-POSIX compatibility
-hash binding
-pack(P)
-fix gv refcnts
+Check out always the latest perl5-porters discussions on these subjects
+before embarking on an implementation tour.
 
-/\Afoo/ (beginning of string, or where previous g match left off)
-/foo\Z/ (end of string only)
-Make specialized allocators
-Optimize switch statements
-Optimize foreach on array
-Optimize foreach (1..1000000)
-Set KEEP on constant split
-Cache eval tree (unless lexical outer scope used (mark in &compiling?))
-rcatmaybe
-Cache method lookup
-Shrink opcode tables via multiple implementations selected in peep
-Straighten out the RS stuff in BEGIN
-Make yyparse recursion longjmp() proof.
+Tie Modules
+	VecArray		Implement array using vec()
+	SubstrArray		Implement array using substr()
+	VirtualArray		Implement array using a file
+	ShiftSplice		Defines shift et al in terms of splice method
+
+Would be nice to have
+	pack "(stuff)*", "(stuff)4", ...
+	Contiguous bitfields in pack/unpack
+	lexperl
+	Bundled perl preprocessor
+	Use posix calls internally where possible
+	gettimeofday (possibly best left for a module?)
+	format BOTTOM
+	-i rename file only when successfully changed
+	All ARGV input should act like <>
+	report HANDLE [formats].
+	support in perlmain to rerun debugger
+	regression tests using __DIE__ hook
+	reference to compiled regexp
+	lexically scoped functions: my sub foo { ... }
+	lvalue functions
+	    wantlvalue?  more generalized want()?
+	named prototypes: sub ($foo, @bar) foo { ... }
+	regression/sanity tests for suidperl
+	iterators/lazy evaluation/continuations/first/
+	    first_defined/short-circuiting grep/??
+	    This is a very thorny and hotly debated subject,
+	    tread carefully and do your homework first.
+	Full 64 bit support (i.e. "long long").  Things to consider:
+	    how to store/retrieve 32+ integers into/from Perl scalars?
+	    32+ constants in Perl code? (non-portable!)
+	    32+ arguments/return values to/from system calls? (seek et al)
+	    32+ bit ops (&|^~, currently explicitly disabled)
+	Generalise Errno way of extracting cpp symbols and use that in
+	    Errno and Fcntl (ExtUtils::CppSymbol?)
+	The _r-problem: for all the {set,get,end}*() system database
+	     calls (and a couple more: readdir, *rand*, crypt, *time,
+	     tmpnam) there are in many systems the _r versions
+	     to be used in re-entrant (=multithreaded) code.
+	     Icky things: the _r API is not standardized and
+	     the _r-forms require per-thread data to store their state.
+	Memory profiler: turn malloc.c:Perl_dump_mstats() into
+	    an extension (Devel::MProf?) that would return the malloc
+	    stats in a nice Perl datastructure (also a simple interface
+	    to return just the grand total would be good).
+	Unicode: [=bar=], combining characters equivalence
+	    (U+4001 + U+0308 should be equal to U+00C4, in other words
+             A+diaereres should equal Ä), Unicode collation
+
+Possible pragmas
+	debugger
+	optimize (use less memory, CPU)
+
+Optimizations
+	constant function cache
+	switch structures
+	foreach(reverse...)
+	Set KEEP on constant split
+	Cache eval tree (unless lexical outer scope used (mark in &compiling?))
+	rcatmaybe
+	Shrink opcode tables via multiple implementations selected in peep
+	Cache hash value?  (Not a win, according to Guido)
+	Optimize away @_ where possible
+	"one pass" global destruction
+	Rewrite regexp parser for better integrated optimization
+	LRU cache of regexp: foreach $pat (@pats) { foo() if /$pat/ }
+
+Vague possibilities
+	ref function in list context
+	make tr/// return histogram in list context?
+	Loop control on do{} et al
+	Explicit switch statements
+	built-in globbing
+	compile to real threaded code
+	structured types
+	autocroak?
+	Modifiable $1 et al
 
-sub mysplice(@, $, $, ...)?
-pretty function?  (or is it, as I suspect, a lib routine?)
-perlex function?
-X Perl?  Motif Perl?
-give DOG $bone?
-Nested destructors?
-make tr/// return histogram in list context?
-Implement eval once?  (Unnecessary with cache?)
-When does split() go to @_?
-undef wantarray in void context?
-goto &coroutine?
-filehandle references?