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 (FunExpr _ k es fs) = funnyStuff k es fs
 182
 183 funnyStuff :: String [Expr] [FieldSelector] -> Gen ()
 184 funnyStuff k es fs = getAdressbook >>= \ab->case 'Map'.get k ab of
 185         //Identifier points to function
 186         Just (LAB l arity fn) = if (arity <> (length es))
 187                 //Function is not complete
 188                 (       tell
 189                                 [Instr "ldc" [Lit fn] "Store function number"
 190                                 ,Instr "sth" [] ""
 191                                 ,Instr "ldc" [Lit $ length es] "Store arity"
 192                                 ,Instr "sth" [] ""
 193                                 ,Instr "ajs" [Lit -1] ""]
 194                         >>| mapM_ g es
 195                         >>| if (isEmpty es) (pure ()) (tell
 196                                 [Instr "stmh" [Lit $ length es] "Store arguments"
 197                                 ,Instr "ajs" [Lit -1] ""]))
 198                 //Function is complete
 199                 (       mapM_ g es
 200                         >>| getAdressbook >>= \ab->(case 'Map'.get k ab of
 201                                 Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
 202                                 Just (LAB t _ _) = tell [Instr "bsr" [L t] (k +++"()")]
 203                                 Just (ADDR t arity) = liftT (Left $ Error "NO ADDRESS JUMPING FFS")
 204                         )
 205                 >>| tell
 206                                 [Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
 207                                 ,Instr "ldr" [Raw "RR"] ""])
 208         //Identifier points to variable, thus higher order function
 209         Just (ADDR t arity) = if (arity <> (length es))
 210                 //Function is still  not complete
 211                 ( fresh >>= \finish->fresh >>= \start->tell [
 212                         //Store function number
 213                          Instr "ldl" [Lit t] "STARTING HIGHER ORDER UPDATE"
 214                         ,Instr "ldh" [Lit 0] "get function number"
 215                         ,Instr "sth" [] "Store"
 216                         //Store function arity
 217                         ,Instr "ldl" [Lit t] "get pointer again"
 218                         ,Instr "ldh" [Lit 1] "get function arity"
 219                         ,Instr "ldc" [Lit $ length es] "add argument number"
 220                         ,Instr "add" [] "add"
 221                         ,Instr "sth" [] "Store"
 222                         ,Instr "ajs" [Lit -1] "Adjust pointer"
 223                         //load the arguments
 224                         ,Instr "ldl" [Lit t] ""
 225                         ,Instr "ldh" [Lit 1] "Load available arguments"
 226                         ,Instr "str" [Raw "R5"] "Store available args in register"
 227                         ,Instr "ldc" [Lit 0] "Store offset"
 228                         ,Instr "str" [Raw "R6"] "Store offset in register"
 229                         ,Lab start
 230                         ,Instr "ldr" [Raw "R5"] ""
 231                         ,Instr "ldc" [Lit 0] ""
 232                         ,Instr "eq" [] ""
 233                         ,Instr "brt" [L finish] "Done pushing arg, bye"
 234                         //Load heapadress
 235                         ,Instr "ldl" [Lit t] ""
 236                         ,Instr "ldr" [Raw "R6"] ""
 237                         ,Instr "add" [] "Corrected heapaddress"
 238                         ,Instr "ldh" [Lit 2] "Load argument"
 239                         ,Instr "sth" [] "And store it immediatly after"
 240                         //Decrease available arguments
 241                         ,Instr "ldr" [Raw "R5"] ""
 242                         ,Instr "ldc" [Lit 1] ""
 243                         ,Instr "sub" [] ""
 244                         ,Instr "str" [Raw "R5"] ""
 245                         //Increase available arguments
 246                         ,Instr "ldr" [Raw "R6"] ""
 247                         ,Instr "ldc" [Lit 1] ""
 248                         ,Instr "add" [] ""
 249                         ,Instr "str" [Raw "R6"] ""
 250                         ,Instr "bra" [L start] ""
 251                         ,Lab finish
 252                         ]
 253                   >>| mapM_ g es
 254                   >>| tell
 255                                 [Instr "stmh" [Lit $ length es] "Store extra args"
 256                                 ,Instr "ajs" [Lit -1] ""]
 257                 )
 258                 //Function is complete
 259                 ( fresh >>= \finish->fresh >>= \start->tell [
 260                          Instr "ldl" [Lit t] "STARTING HIGHER ORDER CALL"
 261                         ,Instr "ldh" [Lit 1] "Load available arguments"
 262                         ,Instr "str" [Raw "R5"] "Store available args in register"
 263                         ,Instr "ldc" [Lit 0] "Store offset"
 264                         ,Instr "str" [Raw "R6"] "Store offset in register"
 265
 266                         ,Lab start
 267                         ,Instr "ldr" [Raw "R5"] ""
 268                         ,Instr "ldc" [Lit 0] ""
 269                         ,Instr "eq" [] ""
 270                         ,Instr "brt" [L finish] "Done pushing arg, bye"
 271                         //Load heapadress
 272                         ,Instr "ldl" [Lit t] ""
 273                         ,Instr "ldr" [Raw "R6"] ""
 274                         ,Instr "add" [] "Corrected heapaddress"
 275                         ,Instr "ldh" [Lit 2] "Load argument"
 276                         //Decrease available arguments
 277                         ,Instr "ldr" [Raw "R5"] ""
 278                         ,Instr "ldc" [Lit 1] ""
 279                         ,Instr "sub" [] ""
 280                         ,Instr "str" [Raw "R5"] ""
 281                         //Increase available arguments
 282                         ,Instr "ldr" [Raw "R6"] ""
 283                         ,Instr "ldc" [Lit 1] ""
 284                         ,Instr "add" [] ""
 285                         ,Instr "str" [Raw "R6"] ""
 286                         ,Instr "bra" [L start] ""
 287                         ,Lab finish
 288                         ]
 289                   >>| mapM_ g es
 290                   >>| tell
 291                         [Instr "ldl" [Lit t] ""
 292                         ,Instr "ldh" [Lit 0] "Get function number"
 293                         ,Instr "str" [Raw "R5"] ""
 294                         ,Instr "bsr" [L "1func"] "HIGHER ORDER END"
 295                         ,Instr "ldl" [Lit t] ""
 296                         ,Instr "ldh" [Lit 1] ""
 297                         ,Instr "neg" [] ""
 298                         ,Instr "ldr" [Raw "SP"] ""
 299                         ,Instr "add" [] ""
 300                         ,Instr "ldc" [Lit $ length es + 1] ""
 301                         ,Instr "sub" [] ""
 302                         ,Instr "str" [Raw "SP"] ""
 303                         ,Instr "ldr" [Raw "RR"] ""
 304                         ]
 305                 )
 306         Nothing = liftT (Left $ Error "Undefined function!!!")
 307
 308 instance g Stmt where
 309     g (IfStmt cond th el) =
 310         fresh >>= \elseLabel->
 311         fresh >>= \endLabel->
 312         g cond >>|
 313        tell [Instr "brf" [L elseLabel] "branch else"] >>|
 314         mapM_ g th >>|
 315         tell [Instr "bra" [L endLabel] "branch end if"] >>|
 316         tell [Lab elseLabel] >>|
 317         mapM_ g el  >>|
 318         tell [Lab endLabel]
 319     g (WhileStmt cond th) =
 320         fresh >>= \startLabel->
 321         fresh >>= \endLabel ->
 322         tell [Lab startLabel] >>|
 323         g cond >>|
 324         tell [Instr "brf" [L endLabel] "branch end while"] >>|
 325         mapM_ g th >>|
 326         tell [Instr "bra" [L startLabel] "branch start while"] >>|
 327         tell [Lab endLabel]
 328     g (AssStmt (VarDef k fs) e) =
 329         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
 330             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
 331             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
 332             Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
 333     g (FunStmt k es fs) = funnyStuff k es fs
 334     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 335                 >>| tell [Instr "ret" [] ""]
 336     g (ReturnStmt (Just e)) = g e
 337                 >>| tell [Instr "str" [Raw "RR"] ""]
 338                 >>| g (ReturnStmt Nothing)
 339
 340 foldVarDecl :: Int VarDecl -> Gen Int
 341 foldVarDecl x (VarDecl _ mt k e) = g e
 342     >>| annote x k
 343         >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
 344         >>| pure (x + 1)
 345
 346 arity :: Type -> Int
 347 arity (_ ->> x) = 1 + arity x
 348 arity _ = 0
 349
 350 addVars :: Type [String] -> (Addressbook -> Addressbook)
 351 addVars _ [] = id
 352 addVars (t ->> ts) [x:xs] = \ab->
 353         extend x (ADDR (-2 - (length xs)) (arity t)) (addVars ts xs ab)
 354 addVars t [x] = \ab->
 355         extend x (ADDR -2 0) ab
 356
 357 instance g FunDecl where
 358     g (FunDecl _ k args mt vds stms) =
 359         //varDecls can call the enclosing function, so first reserve a label for it
 360         getAdressbook >>= \oldMap ->
 361                 updateAdressbook (addVars (fromJust mt) args) >>|
 362         tell [Lab k] >>|
 363                 tell [Instr "link" [Lit 0] ""] >>|
 364         //add the vars
 365         foldM foldVarDecl 1 vds  >>|
 366         //and the statements
 367         mapM_ g stms >>|
 368                 //Ugly hack to always return
 369                 g (ReturnStmt Nothing) >>|
 370         updateAdressbook (const oldMap) >>| pure ()
 371
 372 annote :: Int String -> Gen ()
 373 annote pos key =
 374     tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "black", Raw key] ""]
 375
 376 class print a :: a -> [String]
 377
 378 instance print Instr where
 379     print (Lab l) = [l, ":", "\n"]
 380     print (Instr i args com) = ["\t", i] ++ print args ++ [" ;", com, "\n"]
 381
 382 instance print [Arg] where
 383     print args = (map toString args)
 384
 385 instance toString Arg where
 386     toString (L l) = l
 387     toString (Lit int) = toString int
 388     toString (Raw s) = s
 389
 390 instance toString SSMProgram where
 391     toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p