mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
89 lines
3.4 KiB
Plaintext
89 lines
3.4 KiB
Plaintext
Always check out the latest perl5-porters discussions on these subjects
|
|
before embarking on an implementation tour.
|
|
|
|
Bugs
|
|
remove recursion in regular expression engine
|
|
fix memory leaks during compile failures
|
|
make signal handling safe
|
|
|
|
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)?", "(stuff)+", "(stuff)4", ...
|
|
contiguous bitfields in pack/unpack
|
|
lexperl
|
|
bundled perl preprocessor/macro facility
|
|
this would solve many of the syntactic nice-to-haves
|
|
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
|
|
lexically scoped functions: my sub foo { ... }
|
|
the basic concept is easy and sound,
|
|
the difficulties begin with self-referential
|
|
and mutually referential lexical subs: how to
|
|
declare the subs?
|
|
lexically scoped typeglobs? (lexical I/O handles work now)
|
|
wantlvalue? more generalized want()/caller()?
|
|
named prototypes: sub foo ($foo, @bar) { ... } ?
|
|
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
|
|
generalise Errno way of extracting cpp symbols and use that in
|
|
Errno, Fcntl, POSIX (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
|
|
cross-compilation support
|
|
host vs target: compile in the host, get the executable to
|
|
the target, get the possible input files to the target,
|
|
execute in the target (and do not assume a UNIXish shell
|
|
in the target! e.g. no command redirection can be assumed),
|
|
get possible output files back to to host. this needs to work
|
|
both during Configure and during the build. You cannot assume
|
|
shared filesystems between the host and the target (you may need
|
|
e.g. ftp), executing the target executable may involve e.g. rsh
|
|
a way to make << and >> to shift bitvectors instead of numbers
|
|
|
|
Possible pragmas
|
|
debugger
|
|
optimize (use less qw[memory cpu])
|
|
|
|
Optimizations
|
|
constant function cache
|
|
switch structures
|
|
foreach(reverse...)
|
|
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
|
|
tail recursion removal
|
|
"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
|