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mruby hacking guide
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ksss
April 19, 2014
Programming
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mruby hacking guide
大江戸Ruby会議04 Ninja Talks
http://regional.rubykaigi.org/oedo04/
ksss
April 19, 2014
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Transcript
mruby hacking guide 第256回 Asakusa.rb 2014/04/19 大江戸Ruby会議04
IUUQJMPWFSVCZOFUKBSIHCPPL w .JOFSP"PLJ w 3VCZJTUͷόΠϒϧ w ճಡ͏ʂʂ
about me { name: "Yuki Kurihara", twitter: "@_ksss_", github: "ksss",
commit: "mruby(59)", since: "Feb 26, 2014" }
生活発表会
3VCZͱͷग़ձ͍ ・phpに危機感 ・そうだ、外へ出よう ・RubyKaigi2013に行ってみる
3VCZͱͷग़ձ͍ ・@_zzakのスピーチに感動 ・完全にRubyにハマる ・ゴミみたいなGemを量産
"TBLVTBSCͱͷग़ձ͍ ・今のおまえに足りないものがある ・危機感だ
"TBLVTBSCͱͷग़ձ͍ ・そうだ、Asakusa.rbへ行こう
"TBLVTBSCͱͷग़ձ͍ ・なんか無言でパチパチしてる
"TBLVTBSCͱͷग़ձ͍ ・みんな好き勝手やっているだけ
"TBLVTBSCͱͷग़ձ͍ ・なんだ、好き勝手やっていいんだ
Gemを量産して わかったこと
Rubyの実装は宝の山
None
Ruby is 21 years old Ruby is 21 years old
Ruby is red ocean Ruby is red ocean
None
mruby is 2 years old mruby is 2 years old
mruby is blue ocean mruby is blue ocean
mruby ・コードが短い ・シンプルで読みやすい ・Matzがcommitしてる
✔ github ✖ mail ✖ redmine IUUQTHJUIVCDPNNSVCZNSVCZ
Let's Hack mruby
VM Object lib Build GC parse.y
“Bad programmers worry about the code. Good programmers worry about
data structures and their relationships.” Linus Torvalds
ʮඞཁͳσʔλߏମʹʯ mrubyの方針 ʮγεςϜʹԿ͔Λڧ੍͠ͳ͍ʯ
「データ構造重要」
VM Object lib Build GC parse.y
RString
RString ptr len capa lNSVCZz 5 5
Hack
RString ptr len capa lNSVCZz 5 5
RString ptr len capa void * void * void *
RVALUE
RString lNSVCZz ptr len capa
RString ptr len capa “ m r u b y
” as.ary[]
RString struct RString { MRB_OBJECT_HEADER; mrb_int len; union { mrb_int
capa; struct mrb_shared_string *shared; } aux; char *ptr; };
RString struct RString { MRB_OBJECT_HEADER; union { struct { mrb_int
len; union { mrb_int capa; struct mrb_shared_string *shared; } aux; char *ptr; } heap; char ary[RSTRING_EMBED_LEN_MAX + 1]; } as; };
Embed-String ・less -10% memory allocs ! でもこれって…… https://github.com/mruby/mruby/pull/1820
CRubyから パクった
͜͜Ͱ͘Β͍
Enumerator
昔のHash#each #call-seq: # hsh.each {|k, v| block} -> hsh #
hsh.each -> an_enumerator def each(&block) self.keys.each{|k| block.call([k, self[k]]) } self end
!?
昔のHash#each #call-seq: # hsh.each {|k, v| block} -> hsh #
hsh.each -> an_enumerator def each(&block) self.keys.each{|k| block.call([k, self[k]]) } self end
Hack
NSVCZFOVNFSBUPS IUUQTHJUIVCDPNLTTTNSVCZFOVNFSBUPS
NHFN IUUQTHJUIVCDPNNSVCZNHFNMJTU IUUQTHJUIVCDPNCPWJNHFN NHFNMJTU
Send Pull Request to mruby/mgem-list
IUUQTHJUIVCDPNNSVCZNHFNMJTUQVMM %JEZPVNJTUBLFSFQPTJUPSZ GPSTFOEJOHQVMMSFRVFTU IUUQTHJUIVCDPNNSVCZNSVCZ
/src/* /mrblib/* /mrbgems/* mgem ISO mgem mgem Ruby互換 Freedom
Send Pull Request to mruby/mruby
Merged IUUQTHJUIVCDPNNSVCZNSVCZQVMM
CRubyから パクった
khash
khash ✔IBTIςʔϒϧ ✔$3VCZͰݴ͏TU@UBCMF ✔IU NU JW OT TU ✔γϯϓϧগϝϞϦ ✔։൪๏
✔
khash n_buckets size n_occupied mask inc upper_bound keys vals ed_flags
kh_*
khash keys vals ed_flags malloc( )
khash keys vals ed_flags n_buckets=2
khash keys vals ed_flags empty del khkey_t khval_t n_buckets=1 1
0 1 0 1 0 1 0
hash[a]=1 a 1 0 1 0 1 0 1 0
hash function empty del
hash[a]=1 a 1 hash function a 1 0 0 0
1 0 1 0 empty del 1
hash[b]=2 b 1 hash function a b 1 0 0
0 0 0 1 0 1 2 empty del
hash[b]=2 b 1 hash function del b 1 0 0
1 0 0 1 0 - 2 empty del
Hack
khash n_buckets size n_occupied mask inc upper_bound keys vals ed_flags
kh_* n_buckets-1 n_buckets/2-1 n_buckets*3/4
khash n_buckets size n_occupied mask inc upper_bound keys vals ed_flags
kh_* n_buckets-1 n_buckets/2-1 n_buckets*3/4
kh_get delを無視 kh_put delを上書き khash
khash hashいくつ? 空だった? うん 3 hashいくつ? 3 空だった? うん そこ入れといて
kh_get kh_put
khash hashいくつ? 空だった? うん 3 hashいくつ? 3 空だった? うん そこ入れといて
khash hashいくつ? 空だった? うん 3 そこ入れといて おっけー kh_put
PRしようとしたら matzに先を越された IUUQTHJUIVCDPNNSVCZNSVCZDPNNJU BFDEBGCDFFBFCEDCECGCDDDFCFE
͜Ε͔ΒͬͯΈ͍ͨ͜ͱ ɾIBTIΛ࿈๏Ͱ࣮ͯ͠ൺֱ ɾWN ($ΛಡΜͰվળ ɾͻͨ͢Βόάফ͠
FOE
Hack