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 "ldc" [Lit 0] ""
 178                         ,Instr "stmh" [Lit 2] ""]
 179     g (FunExpr _ k es fs) = getAdressbook >>= \ab->case 'Map'.get k ab of
 180                 //Identifier points to function
 181                 Just (LAB l arity fn) = if (arity <> (length es))
 182                         //Function is not complete
 183                         (       tell
 184                                         [Instr "ldc" [Lit fn] "Store function number"
 185                                         ,Instr "sth" [] ""
 186                                         ,Instr "ldc" [Lit $ length es] "Store arity"
 187                                         ,Instr "sth" [] ""
 188                                         ,Instr "ajs" [Lit -1] ""]
 189                                 >>| mapM_ g es
 190                                 >>| if (isEmpty es) (pure ()) (tell
 191                                         [Instr "stmh" [Lit $ length es] "Store arguments"
 192                                         ,Instr "ajs" [Lit -1] ""]))
 193                         //Function is complete
 194                         (       mapM_ g es
 195                                 >>| jump "bsr" k
 196                         >>| tell
 197                                         [Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
 198                                         ,Instr "ldr" [Raw "RR"] ""])
 199                 //Identifier points to variable, thus higher order function
 200                 Just (ADDR t arity) = if (arity <> (length es))
 201                         //Function is still  not complete
 202                         ( fresh >>= \finish->fresh >>= \start->tell [
 203                                 //Store function number
 204                                  Instr "ldl" [Lit t] "STARTING HIGHER ORDER UPDATE"
 205                                 ,Instr "ldh" [Lit 0] "get function number"
 206                                 ,Instr "sth" [] "Store"
 207                                 //Store function arity
 208                                 ,Instr "ldl" [Lit t] "get pointer again"
 209                                 ,Instr "ldh" [Lit 1] "get function arity"
 210                                 ,Instr "ldc" [Lit $ length es] "add argument number"
 211                                 ,Instr "add" [] "add"
 212                                 ,Instr "sth" [] "Store"
 213                                 ,Instr "ajs" [Lit -1] "Adjust pointer"
 214                                 //load the arguments
 215                                 ,Instr "ldl" [Lit t] ""
 216                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 217                                 ,Instr "str" [Raw "R5"] "Store available args in register"
 218                                 ,Instr "ldc" [Lit 0] "Store offset"
 219                                 ,Instr "str" [Raw "R6"] "Store offset in register"
 220                                 ,Lab start
 221                                 ,Instr "ldr" [Raw "R5"] ""
 222                                 ,Instr "ldc" [Lit 0] ""
 223                                 ,Instr "eq" [] ""
 224                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 225                                 //Load heapadress
 226                                 ,Instr "ldl" [Lit t] ""
 227                                 ,Instr "ldr" [Raw "R6"] ""
 228                                 ,Instr "add" [] "Corrected heapaddress"
 229                                 ,Instr "ldh" [Lit 2] "Load argument"
 230                                 ,Instr "sth" [] "And store it immediatly after"
 231                                 //Decrease available arguments
 232                                 ,Instr "ldr" [Raw "R5"] ""
 233                                 ,Instr "ldc" [Lit 1] ""
 234                                 ,Instr "sub" [] ""
 235                                 ,Instr "str" [Raw "R5"] ""
 236                                 //Increase available arguments
 237                                 ,Instr "ldr" [Raw "R6"] ""
 238                                 ,Instr "ldc" [Lit 1] ""
 239                                 ,Instr "add" [] ""
 240                                 ,Instr "str" [Raw "R6"] ""
 241                                 ,Instr "bra" [L start] ""
 242                                 ,Lab finish
 243                                 ]
 244                           >>| mapM_ g es
 245                           >>| tell
 246                                         [Instr "stmh" [Lit $ length es] "Store extra args"
 247                                         ,Instr "ajs" [Lit -1] ""]
 248                         )
 249                         //Function is complete
 250                         ( fresh >>= \finish->fresh >>= \start->tell [
 251                                  Instr "ldl" [Lit t] "STARTING HIGHER ORDER CALL"
 252                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 253                                 ,Instr "str" [Raw "R5"] "Store available args in register"
 254                                 ,Instr "ldc" [Lit 0] "Store offset"
 255                                 ,Instr "str" [Raw "R6"] "Store offset in register"
 256
 257                                 ,Lab start
 258                                 ,Instr "ldr" [Raw "R5"] ""
 259                                 ,Instr "ldc" [Lit 0] ""
 260                                 ,Instr "eq" [] ""
 261                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 262                                 //Load heapadress
 263                                 ,Instr "ldl" [Lit t] ""
 264                                 ,Instr "ldr" [Raw "R6"] ""
 265                                 ,Instr "add" [] "Corrected heapaddress"
 266                                 ,Instr "ldh" [Lit 2] "Load argument"
 267                                 //Decrease available arguments
 268                                 ,Instr "ldr" [Raw "R5"] ""
 269                                 ,Instr "ldc" [Lit 1] ""
 270                                 ,Instr "sub" [] ""
 271                                 ,Instr "str" [Raw "R5"] ""
 272                                 //Increase available arguments
 273                                 ,Instr "ldr" [Raw "R6"] ""
 274                                 ,Instr "ldc" [Lit 1] ""
 275                                 ,Instr "add" [] ""
 276                                 ,Instr "str" [Raw "R6"] ""
 277                                 ,Instr "bra" [L start] ""
 278                                 ,Lab finish
 279                                 ]
 280                           >>| mapM_ g es
 281                           >>| tell
 282                                 [Instr "ldl" [Lit t] ""
 283                                 ,Instr "ldh" [Lit 0] "Get function number"
 284                                 ,Instr "str" [Raw "R5"] ""
 285                                 ,Instr "bsr" [L "1func"] ""
 286                                 ,Instr "ldr" [Raw "RR"] ""
 287         //                      ,Instr "ldl" [Lit t] ""
 288         //                      ,Instr "ldh" [Lit $ 1] ""
 289         //                      ,Instr "neg" [] ""
 290         //                      ,Instr "ldr" [Raw "SP"] ""
 291         //                      ,Instr "add" [] ""
 292         //                      ,Instr "ldc" [Lit arity] ""
 293         //                      ,Instr "sub" [] ""
 294         //                      ,Instr "str" [Raw "SP"] ""
 295                                 ]
 296                         )
 297                 Nothing = liftT (Left $ Error "Undefined function!!!")
 298
 299 jump :: String String -> Gen ()
 300 jump instr k = getAdressbook >>= \ab->case 'Map'.get k ab of
 301         Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
 302         Just (LAB t _ _) = tell [Instr instr [L t] (k +++"()")]
 303         Just (ADDR t arity) = abort "NO ADDRESS JUMPING FFS"
 304
 305 instance g Stmt where
 306     g (IfStmt cond th el) =
 307         fresh >>= \elseLabel->
 308         fresh >>= \endLabel->
 309         g cond >>|
 310        tell [Instr "brf" [L elseLabel] "branch else"] >>|
 311         mapM_ g th >>|
 312         tell [Instr "bra" [L endLabel] "branch end if"] >>|
 313         tell [Lab elseLabel] >>|
 314         mapM_ g el  >>|
 315         tell [Lab endLabel]
 316     g (WhileStmt cond th) =
 317         fresh >>= \startLabel->
 318         fresh >>= \endLabel ->
 319         tell [Lab startLabel] >>|
 320         g cond >>|
 321         tell [Instr "brf" [L endLabel] "branch end while"] >>|
 322         mapM_ g th >>|
 323         tell [Instr "bra" [L startLabel] "branch start while"] >>|
 324         tell [Lab endLabel]
 325     g (AssStmt (VarDef k fs) e) =
 326         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
 327             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
 328             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
 329             Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
 330     g (FunStmt k es fs) = mapM_ g es
 331         >>| jump "bsr" k
 332         >>| tell [Instr "ajs" [Lit (~(length es))] ""] //clean up args
 333         >>| mapM_ g fs
 334                 >>| pure ()
 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