implementation module gen
-
import StdMisc
import StdList
import StdOverloaded
import StdString
-from StdFunc import id
+from StdFunc import id, const
import StdTuple
import StdEnum
-from StdEnv import const
import Data.Func
import qualified Data.Map as Map
import AST
import RWST
-//Instruction is an instruction, with possible arguments and a possible comment
-//Or is a label
TRUE :== -1
FALSE :== 0
:: Instr = Instr String [Arg] String
:: Gen a :== RWST Label SSMProgram (GenMap, [Label]) (Either GenError) a
labelStream :: [Label]
-labelStream = map (\i-> concat ["lab_", toString i]) [1..]
+labelStream = ["lbl_" +++ toString i\\i<-[1..]]
-gen :: AST -> String
-gen _ = prog
+gen :: AST -> Either String String
+gen (AST fds) = case evalRWST prog "" ('Map'.newMap, labelStream) of
+ Left (Error e) = Left e
+ Right (_, p) = Right $ toString p
where
- expr = (Op2Expr zero (Op1Expr zero UnMinus (IntExpr zero 4)) BiPlus (IntExpr zero 7))
- expr2 = (FunExpr zero "test" [IntExpr zero 4] [])
- stmt = (IfStmt (BoolExpr zero True) [] [])
- prog = case evalRWST (g stmt) "end" ('Map'.newMap, labelStream) of
- Left (Error e) = abort e
- Right (_, prog) = toString prog
-//gen _ = toString [Lab "Test"
-// ,Instr "ldc" [Lit 1] "Eerste instructie"
-// ,Instr "ldc" [Lit 2] "Tweede instructie"]
+ prog = tell [Instr "bra" [L "main"] ""] >>| mapM_ g fds
+//Current issues:
+//All VarDecls are added as function, how to deal with assignments?
+// (And when we deal with assignments, how to deal with assignments to higher order functions?)
+//Dealing with arguments
+//Dealing with types that do not fit on the Stack
+// Probably completely change LoadPlace to a Type and a position relative to *something*
+// And where the type determines if this position is a pointer to the heap or an
+// unboxed value
//helper functions for the gen monad
genMap :: Gen GenMap
genMap = gets fst
+changeGenMap :: (GenMap -> GenMap) -> Gen GenMap
+changeGenMap f = modify (appFst f) >>| genMap
+
+extend :: String LoadPlace GenMap -> GenMap
+extend k pl g = 'Map'.put k pl g
+
fresh :: Gen Label
fresh = gets snd >>= \vars->
modify (appSnd $ const $ tail vars) >>|
instance g Expr where
g (VarExpr _ (VarDef k fs)) = load k >>= \instr-> tell [instr] //note: pure is pure for list, i.e. []
g (IntExpr _ i) = loadP (LDC i) >>= \instr-> tell [instr]
- g (CharExpr _ c) = undef //how to deal with strings?
+ g (CharExpr _ c) = abort "How to deal with chars?"
g (BoolExpr _ True) = loadP (LDC TRUE) >>= \instr-> tell [instr]
g (BoolExpr _ False) = loadP (LDC FALSE) >>= \instr-> tell [instr]
g (Op2Expr _ e1 op e2) = g e1 >>| g e2 >>| tell [Instr (op2ins op) [] ""]
g (Op1Expr _ UnMinus e) = g e >>| tell [Instr "neg" [] ""]
g (EmptyListExpr _) = abort "Shit, empty list expr"
g (TupleExpr p (e1,e2)) = abort "How to deal with tuples?"
- g (FunExpr _ k es fs) = mapM g es >>| jump "bsr" k >>= \instr-> tell [instr]
- //bra is probably not right, figure out function call way
+ g (FunExpr _ k es fs) =
+ mapM g es >>| //put all arguments on the stack (todo: fix argument handling!)
+ jump "bsr" k >>= \instr->
+ tell [instr] >>| //actually branch to function
+ tell [Instr "ldr" [Raw "RR"] ""] //push return value on stack, todo: check for VOID
instance g Stmt where
g (IfStmt cond th el) =
g (AssStmt (VarDef k fs) e) =
g e >>|
abort "Shit, an assignment, figure out something with storing vars or something"
- g (FunStmt _ _) = abort "CodeGen FunStmt unused" //not used
- g (ReturnStmt Nothing) = tell [Instr "ret" [] ""]
+ //vars will be on stack in locals (possible pointers to heap)
+ g (FunStmt _ _) = abort "CodeGen, FunStmt unused" //not used
+ g (ReturnStmt Nothing) = tell [Instr "ret" [] ""] //NOTE! Assumes only return address on stack, safe?
g (ReturnStmt (Just e)) =
g e >>|
tell [Instr "str" [Raw "RR"] ""] >>|
g (ReturnStmt Nothing)
-
+instance g VarDecl where
+ g (VarDecl _ Nothing _ _) = liftT (Left $ Error "PANIC: untyped vardecl")
+ g (VarDecl _ (Just t) k e) =
+ (\l->k+++"_"+++l) <$> fresh >>= \lbl->
+ changeGenMap (extend k (FUNC lbl)) >>|
+ tell [Lab lbl] >>|
+ g e >>|
+ tell [Instr "str" [Raw "RR"] ""] >>|
+ tell [Instr "ret" [] ""]
+
+
+instance g FunDecl where
+ g (FunDecl _ k _ _ vds stms) =
+ //varDecls can call the enclosing function, so first reserve a label for it
+ (\l-> if (k=="main") "main" (l+++"_"+++k)) <$> fresh >>= \lbl->
+ changeGenMap (extend k (FUNC lbl)) >>|
+ //then generate functions for the VarDecls
+ genMap >>= \oldMap ->
+ mapM_ g vds >>|
+ //then the main function
+ tell [Lab lbl] >>|
+ mapM_ g stms >>|
+ changeGenMap (const oldMap) >>| pure ()
op2ins :: Op2 -> String
op2ins op = case op of
jump :: String String -> Gen Instr
jump instr k = genMap >>= \g-> case 'Map'.member k g of
False = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
- True = dec ('Map'.find k g) >>= \lbl-> pure $ Instr instr [lbl] k
+ True = dec ('Map'.find k g) >>= \lbl-> pure $ Instr instr [lbl] (k +++"()")
where
dec (FUNC l) = pure (L l)
dec _ = liftT (Left $ Error "PANIC: trying to jump to non label")
instance toString Arg where
toString (L l) = l
toString (Lit int) = toString int
+ toString (Raw s) = s
instance toString SSMProgram where
- toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p
\ No newline at end of file
+ toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p
repositories / cc1516.git / blobdiff