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Compiler.hs
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Compiler.hs
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module Compiler where
import Debug.Trace
import AbsJavalette
import PrintJavalette
import ErrM
import Control.Monad.State
import Data.List
type Variables = [[(Ident, Int)]]
-- vars, stackCount, localCount, labelCount, finalCode, tempCode, classname
type MyState = (Variables, Int, Int, Int, String, String, String)
type MyStateM = State MyState
compile :: Program -> String -> String
compile (Program fs) classname =
do let code = evalState (compileProgram fs >> getFinalCode) (emptyState classname)
boilerPlate classname code
-- initializing functions
emptyState :: String -> MyState
emptyState classname = ([[]], 0, 0, "", "", classname)
boilerPlate :: String -> String -> String
boilerPlate classname code =
".class public " ++ classname ++ "\n" ++
".super java/lang/Object\n" ++
".method public <init>()V\n" ++
" aload_0\n" ++
" invokespecial java/lang/Object/<init>()V\n" ++
" return\n" ++
".end method\n\n" ++
".method public static main([Ljava/lang/String;)V\n" ++
" .limit locals 1\n" ++
" invokestatic " ++ classname ++ "/main()I\n" ++
" pop\n" ++
" return\n" ++
".end method\n\n" ++
code
compileProgram :: [TopDef] -> MyStateM ()
compileProgram [] = return ()
compileProgram (f:fs) =
do compileFunc f
compileProgram fs
return ()
compileFunc :: TopDef -> MyStateM ()
compileFunc f@(FnDef t (Ident i) a (Block s)) =
do compileStmts s
addFinalCode f
return ()
compileStmts :: [Stmt] -> MyStateM ()
compileStmts [] = return ()
compileStmts (s:ss) = do compileStmt s
compileStmts ss
compileStmt :: Stmt -> MyStateM ()
compileStmt s = case s of
SExp e -> do compileExpr e
return ()
Ret e -> do compileExpr e
return ()
VRet -> do addTempCode (" return\n")
return ()
Cond e stm -> do compileExpr e
addTempCode (" ")
return ()
_ -> return ()
compileExpr :: Expr -> MyStateM ()
compileExpr expr = case expr of
TAnot t (EApp (Ident i) exs) -> do ts <- compileList exs []
let tss = intercalate "," (map (\a -> jType a) ts)
ci <- getClassIdent i
addTempCode (" invokestatic " ++ ci ++ "(" ++ tss ++ ")" ++ (jType t) ++ "\n")
addStackCount 1
return ()
EApp (Ident "printString") a -> do let EString s = head a
addTempCode (" ldc " ++ show s ++ "\n")
addTempCode (" invokestatic Runtime/printString(Ljava/lang/String;)V\n")
return ()
TAnot t (ELitInt i) -> do case and [i >= 0, i <= 5] of
True -> addTempCode (" iconst_" ++ show i ++ "\n")
False -> case i == -1 of
True -> addTempCode (" iconst_m1")
False -> case and [i >= -128, i <= 127] of
True -> addTempCode (" bipush " ++ show i ++ "\n")
False -> addTempCode (" sipush " ++ show i ++ "\n")
addStackCount 1
return ()
TAnot t (EMul e1 op e2) -> do compileExpr e1
compileExpr e2
let ts = case t of
Int -> "i"
Doub -> "d"
case op of
Times -> addTempCode (" " ++ ts ++ "mul\n")
Div -> addTempCode (" " ++ ts ++ "div\n")
Mod -> addTempCode (" " ++ ts ++ "rem\n")
TAnot t (EAdd e1 op e2) -> do compileExpr e1
compileExpr e2
let ts = case t of
Int -> "i"
Doub -> "d"
case op of
Plus -> addTempCode (" " ++ ts ++ "add\n")
Minus -> addTempCode (" " ++ ts ++ "sub\n")
return ()
TAnot t (ELitDoub d) -> do case d of
0.0 -> addTempCode (" dconst_0\n")
1.0 -> addTempCode (" dconst_1\n")
_ -> addTempCode (" ldc2_w " ++ show d ++ "\n")
addStackCount 2
return ()
TAnot t (Neg e) -> do compileExpr e
case t of
Int -> addTempCode " ineg\n"
Doub -> addTempCode " dneg\n"
e -> do addTempCode (" ; " ++ (show e) ++ "\n")
return ()
compileList :: [Expr] -> [Type] -> MyStateM ([Type])
compileList [] ts = return (ts)
compileList (e2@(TAnot t e):es) ts = do compileExpr e2
(compileList es (ts ++ [t]))
--
-- Helper functions
getFinalCode :: MyStateM (String)
getFinalCode = do (vars, stackCount, localCount, labelCount, final, temp, classname) <- get
return final
addFinalCode :: TopDef -> MyStateM ()
addFinalCode (FnDef t (Ident i) a (Block s)) =
do let p = intercalate "," (map (\(Arg t i) -> jType t) a)
let rt = case t of
Bool -> " ireturn\n"
Int -> " ireturn\n"
Doub -> " dreturn\n"
Void -> " return\n"
(vars, stackCount, localCount, labelCount, final, temp, classname) <- get
let newFinal = final ++
".method public static " ++ i ++ "(" ++ p ++ ")" ++ jType t ++ "\n" ++
" .limit locals " ++ show localCount ++ "\n" ++
" .limit stack " ++ show stackCount ++ "\n" ++
temp ++
rt ++
".end method\n\n"
put ([], 0, 0, labelCount, newFinal, "", classname) -- state
return ()
jType :: Type -> String
jType t = case t of
Int -> "I"
Doub -> "D"
Bool -> "B"
Void -> "V"
addTempCode :: String -> MyStateM ()
addTempCode s = do (vars, stackCount, localCount, labelCount, final, temp, classname) <- get
let newTemp = temp ++ s
put (vars, stackCount, localCount, labelCount, final, newTemp, classname) -- state
return ()
addStackCount :: Int -> MyStateM ()
addStackCount i =
do (vars, stackCount, localCount, labelCount, final, temp, classname) <- get
put (vars, stackCount + i, localCount, labelCount, final, temp, classname) -- state
return ()
getClassName :: MyStateM (String)
getClassName = do (vars, stackCount, localCount, labelCount, final, temp, classname) <- get
return classname
incLabelCount :: MaStateM (Int)
incLabelCount = do (vars, stackCount, localCount, labelCount, final, temp, classname) <- get
put (vars, stackCount, localCount, labelCount + 1, final, temp, classname)
return labelCount
getClassIdent :: String -> MyStateM (String)
getClassIdent i =
case find (== i) ["printString", "printDouble", "printInt", "readDouble", "readInt"] of
Just _ -> return ("Runtime/" ++ i)
Nothing -> do classname <- getClassName
return (classname ++ "/" ++ i)