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1 | Always check out the latest perl5-porters discussions on these subjects |
2 | before embarking on an implementation tour. |
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3 | |
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4 | Tie Modules |
5 | VecArray Implement array using vec() |
6 | SubstrArray Implement array using substr() |
7 | VirtualArray Implement array using a file |
8 | ShiftSplice Defines shift et al in terms of splice method |
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9 | |
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10 | Would be nice to have |
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11 | pack "(stuff)*", "(stuff)4", ... |
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12 | contiguous bitfields in pack/unpack |
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13 | lexperl |
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14 | bundled perl preprocessor |
15 | use posix calls internally where possible |
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16 | gettimeofday (possibly best left for a module?) |
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17 | format BOTTOM |
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18 | -i rename file only when successfully changed |
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19 | all ARGV input should act like <> |
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20 | report HANDLE [formats]. |
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21 | support in perlmain to rerun debugger |
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22 | regression tests using __DIE__ hook |
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23 | lexically scoped functions: my sub foo { ... } |
24 | lvalue functions |
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25 | wantlvalue? more generalized want()/caller()? |
26 | named prototypes: sub foo ($foo, @bar) { ... } ? |
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27 | regression/sanity tests for suidperl |
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28 | iterators/lazy evaluation/continuations/first/ |
29 | first_defined/short-circuiting grep/?? |
30 | This is a very thorny and hotly debated subject, |
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31 | tread carefully and do your homework first |
32 | full 64 bit support (i.e. "long long"). Things to consider: |
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33 | how to store/retrieve 32+ integers into/from Perl scalars? |
34 | 32+ constants in Perl code? (non-portable!) |
35 | 32+ arguments/return values to/from system calls? (seek et al) |
36 | 32+ bit ops (&|^~, currently explicitly disabled) |
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37 | generalise Errno way of extracting cpp symbols and use that in |
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38 | Errno and Fcntl (ExtUtils::CppSymbol?) |
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39 | the _r-problem: for all the {set,get,end}*() system database |
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40 | calls (and a couple more: readdir, *rand*, crypt, *time, |
41 | tmpnam) there are in many systems the _r versions |
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42 | to be used in re-entrant (=multithreaded) code |
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43 | Icky things: the _r API is not standardized and |
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44 | the _r-forms require per-thread data to store their state |
45 | memory profiler: turn malloc.c:Perl_dump_mstats() into |
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46 | an extension (Devel::MProf?) that would return the malloc |
47 | stats in a nice Perl datastructure (also a simple interface |
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48 | to return just the grand total would be good) |
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49 | |
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50 | Possible pragmas |
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51 | debugger |
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52 | optimize (use less qw[memory cpu]) |
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53 | |
54 | Optimizations |
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55 | constant function cache |
56 | switch structures |
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57 | foreach(reverse...) |
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58 | optimize away constant split at compile time (a la qw[f o o]) |
59 | cache eval tree (unless lexical outer scope used (mark in &compiling?)) |
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60 | rcatmaybe |
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61 | shrink opcode tables via multiple implementations selected in peep |
62 | cache hash value? (Not a win, according to Guido) |
63 | optimize away @_ where possible |
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64 | "one pass" global destruction |
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65 | rewrite regexp parser for better integrated optimization |
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66 | LRU cache of regexp: foreach $pat (@pats) { foo() if /$pat/ } |
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67 | |
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68 | Vague possibilities |
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69 | ref function in list context? |
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70 | make tr/// return histogram in list context? |
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71 | loop control on do{} et al |
72 | explicit switch statements |
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73 | built-in globbing |
74 | compile to real threaded code |
75 | structured types |
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76 | autocroak? |
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77 | modifiable $1 et al |