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Haskell でつくる VM 〜散りゆく Endomorphism〜
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taiki45
May 11, 2014
Programming
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1.2k
Haskell でつくる VM 〜散りゆく Endomorphism〜
関数型LT大会の LT です
http://connpass.com/event/5795/
taiki45
May 11, 2014
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Transcript
Haskell Ͱͭ͘Δ VM ʙࢄΓΏ͘ Endomorphisʙ taiki45
ϓϩάϥϛϯάྺ2ͷ
ϖϧγΞޠ͠ΌΔ
͓͔͞ͳ
ε( ε^o^)э
hs-vm Simple Virtual Machine written in Haskell. ! https://github.com/taiki45/hs-vm
Why VM
ܭࢉػͷ ιϑτΣΞ࣮
Register Machine vs Stack Machine
hs-vm has no StateT
Endomorphism
Endomorphism A ࢝ҬͱऴҬ͕ಉ͡ܥͰ͋ΔΑ͏ͳ४ಉܕࣸ૾
Endomorphism A ࢝ҬͱऴҬ͕ಉ͡ू߹Ͱ͋ΔΑ͏ͳؔ
VM ͱ໋ྩ V ͋ΔVMΛߟ͑Δ ͦͷVM͕ͱΔঢ়ଶͷू߹Λ V ͱ͢Δ [1,2] [3] [3,4,5]
VM ͱ໋ྩ V [3,4] [1,2,4] Add
VM ͱ໋ྩ VM ͷ໋ྩ Endomorphism ͱߟ͑ΒΕΔ V
໋ྩͷ߹
Monoid (M, ŋ) m ŋ i = m = i
ŋ m m ŋ (m ŋ m) = (m ŋ m) ŋ m
ਖ਼ͷ (N, ×) 3 × 1 = 3 = 3
× 1 3 × (4 × 5) = (3 × 4) × 5
Ϧετ (L, ++) [1, 2] ++ [] = [1, 2]
= [] ++ [1, 2] [1] ++ ([2] ++ [3]) = ([1] ++ [2]) ++ [3]
Endomorphism as Monoid A id f g f . id
= f = id . f (h . g) . f = h . (g . f) h
VM ͱ໋ྩ V f f: VM → VM f: ॳظঢ়ଶ
→ ऴྃঢ়ଶ
VM ͷ࣮ߦͱ
ͻͱͭͷࣸ૾Λ ୳͢͜ͱͩͬͨΜͩʂ
͋Γ͠ͷ VM ͷ࣮ߦ Dual ର Endo ͷରͦͷ߹ॱং͕ٯ 144c3a3dbdb
݅δϟϯϓ
ݱࡏͷ VM ࣮ߦ V Endo Λॱ࣍ద༻͍ͯ͘͠ελΠϧ ࣍ʹద༻͢Δࣸ૾Λ program counter Λͱʹ୳͢
ֶͼ • ػցޠ(ΞηϯϒϦݴޠ)ͱͷରԠ • call convention