gen.icl

   1 implementation module gen
   2
   3 import StdMisc
   4 import StdList
   5 import StdOverloaded
   6 import StdString
   7 from StdFunc import id, const
   8 import StdTuple
   9 import StdEnum
  10
  11 import Data.Func
  12 import qualified Data.Map as Map
  13 import Data.List
  14 import Data.Either
  15 import Data.Tuple
  16 import Data.Functor
  17 import Data.Monoid
  18 import Data.Maybe
  19 import Control.Applicative
  20 import Control.Monad
  21 import Control.Monad.Trans
  22 from Text import class Text(concat), instance Text String
  23
  24 import AST
  25 import RWST
  26
  27 TRUE :== -1
  28 FALSE :== 0
  29 :: Instr    = Instr String [Arg] String
  30             | Lab Label
  31 :: Label :== String
  32 :: Arg = L Label | Lit Int | Raw String
  33 :: SSMProgram :== [Instr]
  34 :: GenError = Error String
  35 :: Addressbook :== 'Map'.Map String Address
  36 :: Address = LAB String Int Int | ADDR Int Int
  37 :: Gen a :== RWST () SSMProgram (Addressbook, [Label]) (Either GenError) a
  38
  39 labelStream :: [Label]
  40 labelStream = ["lbl_" +++ toString i\\i<-[1..]]
  41
  42 defaultAddressBook :: [FunDecl] -> Addressbook
  43 defaultAddressBook fd = extend "1printint" (LAB "1printint" 1 0)
  44         $ extend "1printchar" (LAB "1printchar" 1 1)
  45         $ extend "read" (LAB "read" 0 2)
  46         $ extend "1readint" (LAB "1readint" 0 3)
  47         $ extend "isEmpty" (LAB "isempty" 1 4)
  48         $ addFuncs fd 5
  49         where
  50                 addFuncs [] _ = 'Map'.newMap
  51                 addFuncs [(FunDecl _ k args _ _ _):xs] n =
  52                         extend k (LAB k (length args) n) $ addFuncs xs (n+1)
  53
  54 gen :: AST -> Either String String
  55 gen (AST fds) = case evalRWST prog () (defaultAddressBook fds, labelStream) of
  56             Left (Error e) = Left e
  57             Right (_, p) = Right $ toString p
  58     where
  59         prog = tell [
  60                         Instr "bsr" [L "main"] "",
  61                         Instr "halt" [] ""
  62                         ] >>| tell (programContext fds)
  63             >>| mapM_ g fds
  64
  65 programContext :: [FunDecl] -> SSMProgram
  66 programContext x = [Lab "1func"
  67                                 :fS ["1printint" ,"1printchar"
  68                                         ,"read" ,"1readint"
  69                                         ,"isEmpty":map (\(FunDecl _ k _ _ _ _)->k) x] 0] ++ context
  70         where
  71
  72                 fS :: [String] Int -> SSMProgram
  73                 fS [] _ = []
  74                 fS [k:xs] n = [
  75                          Lab $ "1next" +++ toString n
  76                         ,Instr "ldr" [Raw "R5"] ""
  77                         ,Instr "ldc" [Lit n] $ "branch to: " +++ k
  78                         ,Instr "eq" [] ""
  79                         ,Instr "brf" [L $ "1next" +++ (toString $ n + 1)] ""
  80                         ,Instr "bra" [L k] ""
  81                         :fS xs $ n+1]
  82                 context :: SSMProgram
  83                 context =   [Lab "1printint"
  84                     ,Instr "link" [Lit 0] ""
  85                     ,Instr "ldl" [Lit -2] "load first argument"
  86                                         ,Instr "trap" [Lit 0] "print int"
  87                     ,Instr "unlink" [] ""
  88                     ,Instr "ret" [] ""
  89                                         ,Lab "1printchar"
  90                     ,Instr "link" [Lit 0] ""
  91                     ,Instr "ldl" [Lit -2] "load first argument"
  92                                         ,Instr "trap" [Lit 1] "print char"
  93                     ,Instr "unlink" [] ""
  94                     ,Instr "ret" [] ""
  95                     ,Lab "read"
  96                     ,Instr "link" [Lit 0] ""
  97                                         ,Instr "trap" [Lit 11] "read char"
  98                     ,Instr "str" [Raw "RR"] ""
  99                     ,Instr "unlink" [] ""
 100                     ,Instr "ret" [] ""
 101                     ,Lab "isempty"
 102                     ,Instr "link" [Lit 0] ""
 103                     ,Instr "ldl" [Lit -2] "load prt to list"
 104                     ,Instr "lda" [Lit 0] "derefrence ptr"
 105                     ,Instr "ldc" [Lit 0] ""
 106                     ,Instr "eq" [] "test for null pointer"
 107                     ,Instr "str" [Raw "RR"] ""
 108                     ,Instr "unlink" [] ""
 109                     ,Instr "ret" [] ""
 110                     ,Lab "read"
 111                     ]
 112
 113 getAdressbook :: Gen Addressbook
 114 getAdressbook = gets fst
 115
 116 updateAdressbook :: (Addressbook -> Addressbook) -> Gen Addressbook
 117 updateAdressbook f = modify (appFst f) >>| getAdressbook
 118
 119 extend :: String Address Addressbook -> Addressbook
 120 extend k pl g = 'Map'.put k pl g
 121
 122 fresh :: Gen Label
 123 fresh = gets snd >>= \vars->
 124         modify (appSnd $ const $ tail vars) >>|
 125         pure (head vars)
 126
 127 class g a :: a -> Gen ()
 128
 129 instance g Op1 where
 130         g UnNegation = tell [Instr "not" [] ""]
 131         g UnMinus = tell [Instr "neg" [] ""]
 132
 133 instance g Op2 where
 134         g o = tell [Instr s [] ""]
 135                 where
 136                         s = case o of
 137                     BiPlus = "add"
 138                                 BiMinus = "sub"
 139                     BiTimes = "mul"
 140                     BiDivide = "div"
 141                     BiMod = "mod"
 142                     BiEquals = "eq"
 143                     BiLesser = "lt"
 144                     BiGreater = "gt"
 145                     BiLesserEq = "le"
 146                     BiGreaterEq = "ge"
 147                     BiUnEqual = "ne"
 148                     BiAnd =  "and"
 149                     BiOr = "or"
 150                     BiCons = abort "Shit, Cons, how to deal with this?"
 151
 152 instance g FieldSelector where
 153         g FieldFst = tell [Instr "lda" [Lit -1] "fst"]
 154         g FieldSnd = tell [Instr "lda" [Lit 0] "snd"]
 155         g FieldHd = tell [Instr "lda" [Lit -1] "hd"]
 156         g FieldTl = tell [Instr "lda" [Lit 0] "tl"]
 157
 158 instance g Expr where
 159     g (IntExpr _ i) = tell [Instr "ldc" [Lit i] ""]
 160     g (CharExpr _ c) = tell [Instr "ldc" [Lit (toInt c)] ""]
 161         g (BoolExpr _ b) = tell [Instr "ldc" [Lit (if b TRUE FALSE)] ""]
 162     g (EmptyListExpr _) = tell [Instr "ldc" [Lit 0] ""]
 163                 >>| tell [Instr "sth" [] ""]
 164     g (Op1Expr _ o e) = g e >>| g o
 165     g (Op2Expr _ e1 BiCons e2) = g e2 >>| g e1
 166                 >>| tell [Instr "sth" [] ""]
 167                 >>| tell [Instr "ajs" [Lit -1] ""]
 168                 >>| tell [Instr "sth" [] ""]
 169     g (Op2Expr _ e1 op e2) = g e1 >>| g e2 >>| g op
 170     g (TupleExpr _ (e1,e2)) = g e1
 171                 >>| g e2
 172                 >>| tell [Instr "stmh" [Lit 2] ""]
 173     g (VarExpr _ (VarDef k fs)) = getAdressbook >>= \ab->case 'Map'.get k ab of
 174                 Just (ADDR t arity) = tell [Instr "ldl" [Lit t] ""] >>| mapM_ g fs >>| pure ()
 175                 Just (LAB l _ fn) = tell
 176                         [Instr "ldc" [Lit fn] ""
 177                         ,Instr "sth" [] ""
 178                         ,Instr "ldc" [Lit 0] ""
 179                         ,Instr "sth" [] ""
 180                         ,Instr "ajs" [Lit -1] ""]
 181     g (LambdaExpr _ _ _) = liftT $ Left $ Error "PANIC: Lambdas should be unfolded"
 182     g (FunExpr _ k es fs) = funnyStuff k es fs
 183
 184 funnyStuff :: String [Expr] [FieldSelector] -> Gen ()
 185 funnyStuff k es fs = getAdressbook >>= \ab->case 'Map'.get k ab of
 186         //Identifier points to function
 187         Just (LAB l arity fn) = if (arity <> (length es))
 188                 //Function is not complete
 189                 (       tell
 190                                 [Instr "ldc" [Lit fn] "Store function number"
 191                                 ,Instr "sth" [] ""
 192                                 ,Instr "ldc" [Lit $ length es] "Store arity"
 193                                 ,Instr "sth" [] ""
 194                                 ,Instr "ajs" [Lit -1] ""]
 195                         >>| mapM_ g es
 196                         >>| if (isEmpty es) (pure ()) (tell
 197                                 [Instr "stmh" [Lit $ length es] "Store arguments"
 198                                 ,Instr "ajs" [Lit -1] ""]))
 199                 //Function is complete
 200                 (       mapM_ g es
 201                         >>| getAdressbook >>= \ab->(case 'Map'.get k ab of
 202                                 Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
 203                                 Just (LAB t _ _) = tell [Instr "bsr" [L t] (k +++"()")]
 204                                 Just (ADDR t arity) = liftT (Left $ Error "NO ADDRESS JUMPING FFS")
 205                         )
 206                 >>| tell
 207                                 [Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
 208                                 ,Instr "ldr" [Raw "RR"] ""])
 209         //Identifier points to variable, thus higher order function
 210         Just (ADDR t arity) = if (arity <> (length es))
 211                 //Function is still  not complete
 212                 ( fresh >>= \finish->fresh >>= \start->tell [
 213                         //Store function number
 214                          Instr "ldl" [Lit t] "STARTING HIGHER ORDER UPDATE"
 215                         ,Instr "ldh" [Lit 0] "get function number"
 216                         ,Instr "sth" [] "Store"
 217                         //Store function arity
 218                         ,Instr "ldl" [Lit t] "get pointer again"
 219                         ,Instr "ldh" [Lit 1] "get function arity"
 220                         ,Instr "ldc" [Lit $ length es] "add argument number"
 221                         ,Instr "add" [] "add"
 222                         ,Instr "sth" [] "Store"
 223                         ,Instr "ajs" [Lit -1] "Adjust pointer"
 224                         //load the arguments
 225                         ,Instr "ldl" [Lit t] ""
 226                         ,Instr "ldh" [Lit 1] "Load available arguments"
 227                         ,Instr "str" [Raw "R5"] "Store available args in register"
 228                         ,Instr "ldc" [Lit 0] "Store offset"
 229                         ,Instr "str" [Raw "R6"] "Store offset in register"
 230                         ,Lab start
 231                         ,Instr "ldr" [Raw "R5"] ""
 232                         ,Instr "ldc" [Lit 0] ""
 233                         ,Instr "eq" [] ""
 234                         ,Instr "brt" [L finish] "Done pushing arg, bye"
 235                         //Load heapadress
 236                         ,Instr "ldl" [Lit t] ""
 237                         ,Instr "ldr" [Raw "R6"] ""
 238                         ,Instr "add" [] "Corrected heapaddress"
 239                         ,Instr "ldh" [Lit 2] "Load argument"
 240                         ,Instr "sth" [] "And store it immediatly after"
 241                         //Decrease available arguments
 242                         ,Instr "ldr" [Raw "R5"] ""
 243                         ,Instr "ldc" [Lit 1] ""
 244                         ,Instr "sub" [] ""
 245                         ,Instr "str" [Raw "R5"] ""
 246                         //Increase available arguments
 247                         ,Instr "ldr" [Raw "R6"] ""
 248                         ,Instr "ldc" [Lit 1] ""
 249                         ,Instr "add" [] ""
 250                         ,Instr "str" [Raw "R6"] ""
 251                         ,Instr "bra" [L start] ""
 252                         ,Lab finish
 253                         ]
 254                   >>| mapM_ g es
 255                   >>| tell
 256                                 [Instr "stmh" [Lit $ length es] "Store extra args"
 257                                 ,Instr "ajs" [Lit -1] ""]
 258                 )
 259                 //Function is complete
 260                 ( fresh >>= \finish->fresh >>= \start->tell [
 261                          Instr "ldl" [Lit t] "STARTING HIGHER ORDER CALL"
 262                         ,Instr "ldh" [Lit 1] "Load available arguments"
 263                         ,Instr "str" [Raw "R5"] "Store available args in register"
 264                         ,Instr "ldc" [Lit 0] "Store offset"
 265                         ,Instr "str" [Raw "R6"] "Store offset in register"
 266
 267                         ,Lab start
 268                         ,Instr "ldr" [Raw "R5"] ""
 269                         ,Instr "ldc" [Lit 0] ""
 270                         ,Instr "eq" [] ""
 271                         ,Instr "brt" [L finish] "Done pushing arg, bye"
 272                         //Load heapadress
 273                         ,Instr "ldl" [Lit t] ""
 274                         ,Instr "ldr" [Raw "R6"] ""
 275                         ,Instr "add" [] "Corrected heapaddress"
 276                         ,Instr "ldh" [Lit 2] "Load argument"
 277                         //Decrease available arguments
 278                         ,Instr "ldr" [Raw "R5"] ""
 279                         ,Instr "ldc" [Lit 1] ""
 280                         ,Instr "sub" [] ""
 281                         ,Instr "str" [Raw "R5"] ""
 282                         //Increase available arguments
 283                         ,Instr "ldr" [Raw "R6"] ""
 284                         ,Instr "ldc" [Lit 1] ""
 285                         ,Instr "add" [] ""
 286                         ,Instr "str" [Raw "R6"] ""
 287                         ,Instr "bra" [L start] ""
 288                         ,Lab finish
 289                         ]
 290                   >>| mapM_ g es
 291                   >>| tell
 292                         [Instr "ldl" [Lit t] ""
 293                         ,Instr "ldh" [Lit 0] "Get function number"
 294                         ,Instr "str" [Raw "R5"] ""
 295                         ,Instr "bsr" [L "1func"] "HIGHER ORDER END"
 296                         ,Instr "ldl" [Lit t] ""
 297                         ,Instr "ldh" [Lit 1] ""
 298                         ,Instr "neg" [] ""
 299                         ,Instr "ldr" [Raw "SP"] ""
 300                         ,Instr "add" [] ""
 301                         ,Instr "ldc" [Lit $ length es + 1] ""
 302                         ,Instr "sub" [] ""
 303                         ,Instr "str" [Raw "SP"] ""
 304                         ,Instr "ldr" [Raw "RR"] ""
 305                         ]
 306                 )
 307         Nothing = liftT (Left $ Error $ "PANIC: Undefined function: " +++ k)
 308
 309 instance g Stmt where
 310     g (IfStmt cond th el) =
 311         fresh >>= \elseLabel->
 312         fresh >>= \endLabel->
 313         g cond >>|
 314        tell [Instr "brf" [L elseLabel] "branch else"] >>|
 315         mapM_ g th >>|
 316         tell [Instr "bra" [L endLabel] "branch end if"] >>|
 317         tell [Lab elseLabel] >>|
 318         mapM_ g el  >>|
 319         tell [Lab endLabel]
 320     g (WhileStmt cond th) =
 321         fresh >>= \startLabel->
 322         fresh >>= \endLabel ->
 323         tell [Lab startLabel] >>|
 324         g cond >>|
 325         tell [Instr "brf" [L endLabel] "branch end while"] >>|
 326         mapM_ g th >>|
 327         tell [Instr "bra" [L startLabel] "branch start while"] >>|
 328         tell [Lab endLabel]
 329     g (AssStmt (VarDef k fs) e) =
 330         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
 331             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
 332             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
 333             Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
 334     g (FunStmt k es fs) = funnyStuff k es fs
 335     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 336                 >>| tell [Instr "ret" [] ""]
 337     g (ReturnStmt (Just e)) = g e
 338                 >>| tell [Instr "str" [Raw "RR"] ""]
 339                 >>| g (ReturnStmt Nothing)
 340
 341 foldVarDecl :: Int VarDecl -> Gen Int
 342 foldVarDecl x (VarDecl _ mt k e) = g e
 343     >>| annote x k
 344         >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
 345         >>| pure (x + 1)
 346
 347 arity :: Type -> Int
 348 arity (_ ->> x) = 1 + arity x
 349 arity _ = 0
 350
 351 addVars :: Type [String] -> (Addressbook -> Addressbook)
 352 addVars _ [] = id
 353 addVars (t ->> ts) [x:xs] = \ab->
 354         extend x (ADDR (-2 - (length xs)) (arity t)) (addVars ts xs ab)
 355 addVars t [x] = \ab->
 356         extend x (ADDR -2 0) ab
 357
 358 instance g FunDecl where
 359     g (FunDecl _ k args mt vds stms) =
 360         //varDecls can call the enclosing function, so first reserve a label for it
 361         getAdressbook >>= \oldMap ->
 362                 updateAdressbook (addVars (fromJust mt) args) >>|
 363         tell [Lab k] >>|
 364                 tell [Instr "link" [Lit 0] ""] >>|
 365         //add the vars
 366         foldM foldVarDecl 1 vds  >>|
 367         //and the statements
 368         mapM_ g stms >>|
 369                 //Ugly hack to always return
 370                 g (ReturnStmt Nothing) >>|
 371         updateAdressbook (const oldMap) >>| pure ()
 372
 373 annote :: Int String -> Gen ()
 374 annote pos key =
 375     tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "black", Raw key] ""]
 376
 377 class print a :: a -> [String]
 378
 379 instance print Instr where
 380     print (Lab l) = [l, ":", "\n"]
 381     print (Instr i args com) = ["\t", i] ++ print args ++ [" ;", com, "\n"]
 382
 383 instance print [Arg] where
 384     print args = (map toString args)
 385
 386 instance toString Arg where
 387     toString (L l) = l
 388     toString (Lit int) = toString int
 389     toString (Raw s) = s
 390
 391 instance toString SSMProgram where
 392     toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p