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89 lines
3.4 KiB
Plaintext
89 lines
3.4 KiB
Plaintext
Always check out the latest perl5-porters discussions on these subjects
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before embarking on an implementation tour.
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Bugs
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remove recursion in regular expression engine
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fix memory leaks during compile failures
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make signal handling safe
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Tie Modules
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VecArray Implement array using vec()
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SubstrArray Implement array using substr()
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VirtualArray Implement array using a file
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ShiftSplice Defines shift et al in terms of splice method
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Would be nice to have
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pack "(stuff)*", "(stuff)?", "(stuff)+", "(stuff)4", ...
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contiguous bitfields in pack/unpack
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lexperl
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bundled perl preprocessor/macro facility
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this would solve many of the syntactic nice-to-haves
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use posix calls internally where possible
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gettimeofday (possibly best left for a module?)
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format BOTTOM
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-i rename file only when successfully changed
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all ARGV input should act like <>
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report HANDLE [formats].
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support in perlmain to rerun debugger
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regression tests using __DIE__ hook
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lexically scoped functions: my sub foo { ... }
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the basic concept is easy and sound,
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the difficulties begin with self-referential
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and mutually referential lexical subs: how to
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declare the subs?
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lexically scoped typeglobs? (lexical I/O handles work now)
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wantlvalue? more generalized want()/caller()?
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named prototypes: sub foo ($foo, @bar) { ... } ?
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regression/sanity tests for suidperl
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iterators/lazy evaluation/continuations/first/
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first_defined/short-circuiting grep/??
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This is a very thorny and hotly debated subject,
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tread carefully and do your homework first
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generalise Errno way of extracting cpp symbols and use that in
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Errno, Fcntl, POSIX (ExtUtils::CppSymbol?)
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the _r-problem: for all the {set,get,end}*() system database
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calls (and a couple more: readdir, *rand*, crypt, *time,
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tmpnam) there are in many systems the _r versions
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to be used in re-entrant (=multithreaded) code
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Icky things: the _r API is not standardized and
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the _r-forms require per-thread data to store their state
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cross-compilation support
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host vs target: compile in the host, get the executable to
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the target, get the possible input files to the target,
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execute in the target (and do not assume a UNIXish shell
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in the target! e.g. no command redirection can be assumed),
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get possible output files back to to host. this needs to work
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both during Configure and during the build. You cannot assume
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shared filesystems between the host and the target (you may need
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e.g. ftp), executing the target executable may involve e.g. rsh
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a way to make << and >> to shift bitvectors instead of numbers
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Possible pragmas
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debugger
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optimize (use less qw[memory cpu])
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Optimizations
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constant function cache
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switch structures
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foreach(reverse...)
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cache eval tree (unless lexical outer scope used (mark in &compiling?))
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rcatmaybe
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shrink opcode tables via multiple implementations selected in peep
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cache hash value? (Not a win, according to Guido)
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optimize away @_ where possible
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tail recursion removal
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"one pass" global destruction
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rewrite regexp parser for better integrated optimization
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LRU cache of regexp: foreach $pat (@pats) { foo() if /$pat/ }
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Vague possibilities
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ref function in list context?
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make tr/// return histogram in list context?
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loop control on do{} et al
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explicit switch statements
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built-in globbing
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compile to real threaded code
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structured types
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autocroak?
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modifiable $1 et al
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