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synced 2026-04-09 21:19:31 -06:00
21 lines
793 B
Haskell
21 lines
793 B
Haskell
module JVM where
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mkJVM :: String -> String
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mkJVM = unlines . reverse . fst . foldl trans ([],([],0)) . lines where
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trans (code,(env,v)) s = case words s of
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".method":f:ns -> ((".method " ++ f ++ concat ns):code,([],0))
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"alloc":t:x:_ -> (code, ((x,v):env, v + size t))
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".limit":"locals":ns -> chCode (".limit locals " ++ show (length ns - 1))
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t:"_load" :x:_ -> chCode (t ++ "load " ++ look x)
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t:"_store":x:_ -> chCode (t ++ "store " ++ look x)
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t:"_return":_ -> chCode (t ++ "return")
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"goto":ns -> chCode ("goto " ++ concat ns)
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"ifzero":ns -> chCode ("ifzero " ++ concat ns)
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_ -> chCode s
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where
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chCode c = (c:code,(env,v))
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look x = maybe (x ++ show env) show $ lookup x env
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size t = case t of
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"d" -> 2
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_ -> 1
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