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) = getAdressbook >>= \ab->case 'Map'.get k ab of
 182                 //Identifier points to function
 183                 Just (LAB l arity fn) = if (arity <> (length es))
 184                         //Function is not complete
 185                         (       tell
 186                                         [Instr "ldc" [Lit fn] "Store function number"
 187                                         ,Instr "sth" [] ""
 188                                         ,Instr "ldc" [Lit $ length es] "Store arity"
 189                                         ,Instr "sth" [] ""
 190                                         ,Instr "ajs" [Lit -1] ""]
 191                                 >>| mapM_ g es
 192                                 >>| if (isEmpty es) (pure ()) (tell
 193                                         [Instr "stmh" [Lit $ length es] "Store arguments"
 194                                         ,Instr "ajs" [Lit -1] ""]))
 195                         //Function is complete
 196                         (       mapM_ g es
 197                                 >>| jump "bsr" k
 198                         >>| tell
 199                                         [Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
 200                                         ,Instr "ldr" [Raw "RR"] ""])
 201                 //Identifier points to variable, thus higher order function
 202                 Just (ADDR t arity) = if (arity <> (length es))
 203                         //Function is still  not complete
 204                         ( fresh >>= \finish->fresh >>= \start->tell [
 205                                 //Store function number
 206                                  Instr "ldl" [Lit t] "STARTING HIGHER ORDER UPDATE"
 207                                 ,Instr "ldh" [Lit 0] "get function number"
 208                                 ,Instr "sth" [] "Store"
 209                                 //Store function arity
 210                                 ,Instr "ldl" [Lit t] "get pointer again"
 211                                 ,Instr "ldh" [Lit 1] "get function arity"
 212                                 ,Instr "ldc" [Lit $ length es] "add argument number"
 213                                 ,Instr "add" [] "add"
 214                                 ,Instr "sth" [] "Store"
 215                                 ,Instr "ajs" [Lit -1] "Adjust pointer"
 216                                 //load the arguments
 217                                 ,Instr "ldl" [Lit t] ""
 218                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 219                                 ,Instr "str" [Raw "R5"] "Store available args in register"
 220                                 ,Instr "ldc" [Lit 0] "Store offset"
 221                                 ,Instr "str" [Raw "R6"] "Store offset in register"
 222                                 ,Lab start
 223                                 ,Instr "ldr" [Raw "R5"] ""
 224                                 ,Instr "ldc" [Lit 0] ""
 225                                 ,Instr "eq" [] ""
 226                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 227                                 //Load heapadress
 228                                 ,Instr "ldl" [Lit t] ""
 229                                 ,Instr "ldr" [Raw "R6"] ""
 230                                 ,Instr "add" [] "Corrected heapaddress"
 231                                 ,Instr "ldh" [Lit 2] "Load argument"
 232                                 ,Instr "sth" [] "And store it immediatly after"
 233                                 //Decrease available arguments
 234                                 ,Instr "ldr" [Raw "R5"] ""
 235                                 ,Instr "ldc" [Lit 1] ""
 236                                 ,Instr "sub" [] ""
 237                                 ,Instr "str" [Raw "R5"] ""
 238                                 //Increase available arguments
 239                                 ,Instr "ldr" [Raw "R6"] ""
 240                                 ,Instr "ldc" [Lit 1] ""
 241                                 ,Instr "add" [] ""
 242                                 ,Instr "str" [Raw "R6"] ""
 243                                 ,Instr "bra" [L start] ""
 244                                 ,Lab finish
 245                                 ]
 246                           >>| mapM_ g es
 247                           >>| tell
 248                                         [Instr "stmh" [Lit $ length es] "Store extra args"
 249                                         ,Instr "ajs" [Lit -1] ""]
 250                         )
 251                         //Function is complete
 252                         ( fresh >>= \finish->fresh >>= \start->tell [
 253                                  Instr "ldl" [Lit t] "STARTING HIGHER ORDER CALL"
 254                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 255                                 ,Instr "str" [Raw "R5"] "Store available args in register"
 256                                 ,Instr "ldc" [Lit 0] "Store offset"
 257                                 ,Instr "str" [Raw "R6"] "Store offset in register"
 258
 259                                 ,Lab start
 260                                 ,Instr "ldr" [Raw "R5"] ""
 261                                 ,Instr "ldc" [Lit 0] ""
 262                                 ,Instr "eq" [] ""
 263                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 264                                 //Load heapadress
 265                                 ,Instr "ldl" [Lit t] ""
 266                                 ,Instr "ldr" [Raw "R6"] ""
 267                                 ,Instr "add" [] "Corrected heapaddress"
 268                                 ,Instr "ldh" [Lit 2] "Load argument"
 269                                 //Decrease available arguments
 270                                 ,Instr "ldr" [Raw "R5"] ""
 271                                 ,Instr "ldc" [Lit 1] ""
 272                                 ,Instr "sub" [] ""
 273                                 ,Instr "str" [Raw "R5"] ""
 274                                 //Increase available arguments
 275                                 ,Instr "ldr" [Raw "R6"] ""
 276                                 ,Instr "ldc" [Lit 1] ""
 277                                 ,Instr "add" [] ""
 278                                 ,Instr "str" [Raw "R6"] ""
 279                                 ,Instr "bra" [L start] ""
 280                                 ,Lab finish
 281                                 ]
 282                           >>| mapM_ g es
 283                           >>| tell
 284                                 [Instr "ldl" [Lit t] ""
 285                                 ,Instr "ldh" [Lit 0] "Get function number"
 286                                 ,Instr "str" [Raw "R5"] ""
 287                                 ,Instr "bsr" [L "1func"] "HIGHER ORDER END"
 288                                 ,Instr "ldl" [Lit t] ""
 289                                 ,Instr "ldh" [Lit 1] ""
 290                                 ,Instr "neg" [] ""
 291                                 ,Instr "ldr" [Raw "SP"] ""
 292                                 ,Instr "add" [] ""
 293                                 ,Instr "ldc" [Lit $ length es + 1] ""
 294                                 ,Instr "sub" [] ""
 295                                 ,Instr "str" [Raw "SP"] ""
 296                                 ,Instr "ldr" [Raw "RR"] ""
 297                                 ]
 298                         )
 299                 Nothing = liftT (Left $ Error "Undefined function!!!")
 300
 301 jump :: String String -> Gen ()
 302 jump instr k = getAdressbook >>= \ab->case 'Map'.get k ab of
 303         Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
 304         Just (LAB t _ _) = tell [Instr instr [L t] (k +++"()")]
 305         Just (ADDR t arity) = abort "NO ADDRESS JUMPING FFS"
 306
 307 instance g Stmt where
 308     g (IfStmt cond th el) =
 309         fresh >>= \elseLabel->
 310         fresh >>= \endLabel->
 311         g cond >>|
 312        tell [Instr "brf" [L elseLabel] "branch else"] >>|
 313         mapM_ g th >>|
 314         tell [Instr "bra" [L endLabel] "branch end if"] >>|
 315         tell [Lab elseLabel] >>|
 316         mapM_ g el  >>|
 317         tell [Lab endLabel]
 318     g (WhileStmt cond th) =
 319         fresh >>= \startLabel->
 320         fresh >>= \endLabel ->
 321         tell [Lab startLabel] >>|
 322         g cond >>|
 323         tell [Instr "brf" [L endLabel] "branch end while"] >>|
 324         mapM_ g th >>|
 325         tell [Instr "bra" [L startLabel] "branch start while"] >>|
 326         tell [Lab endLabel]
 327     g (AssStmt (VarDef k fs) e) =
 328         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
 329             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
 330             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
 331             Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
 332     g (FunStmt k es fs) = mapM_ g es
 333         >>| jump "bsr" k
 334         >>| tell [Instr "ajs" [Lit (~(length es))] ""] //clean up args
 335         >>| mapM_ g fs
 336                 >>| pure ()
 337     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 338                 >>| tell [Instr "ret" [] ""]
 339     g (ReturnStmt (Just e)) = g e
 340                 >>| tell [Instr "str" [Raw "RR"] ""]
 341                 >>| g (ReturnStmt Nothing)
 342
 343 foldVarDecl :: Int VarDecl -> Gen Int
 344 foldVarDecl x (VarDecl _ mt k e) = g e
 345     >>| annote x k
 346         >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
 347         >>| pure (x + 1)
 348
 349 arity :: Type -> Int
 350 arity (_ ->> x) = 1 + arity x
 351 arity _ = 0
 352
 353 addVars :: Type [String] -> (Addressbook -> Addressbook)
 354 addVars _ [] = id
 355 addVars (t ->> ts) [x:xs] = \ab->
 356         extend x (ADDR (-2 - (length xs)) (arity t)) (addVars ts xs ab)
 357 addVars t [x] = \ab->
 358         extend x (ADDR -2 0) ab
 359
 360 instance g FunDecl where
 361     g (FunDecl _ k args mt vds stms) =
 362         //varDecls can call the enclosing function, so first reserve a label for it
 363         getAdressbook >>= \oldMap ->
 364                 updateAdressbook (addVars (fromJust mt) args) >>|
 365         tell [Lab k] >>|
 366                 tell [Instr "link" [Lit 0] ""] >>|
 367         //add the vars
 368         foldM foldVarDecl 1 vds  >>|
 369         //and the statements
 370         mapM_ g stms >>|
 371                 //Ugly hack to always return
 372                 g (ReturnStmt Nothing) >>|
 373         updateAdressbook (const oldMap) >>| pure ()
 374
 375 annote :: Int String -> Gen ()
 376 annote pos key =
 377     tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "black", Raw key] ""]
 378
 379 class print a :: a -> [String]
 380
 381 instance print Instr where
 382     print (Lab l) = [l, ":", "\n"]
 383     print (Instr i args com) = ["\t", i] ++ print args ++ [" ;", com, "\n"]
 384
 385 instance print [Arg] where
 386     print args = (map toString args)
 387
 388 instance toString Arg where
 389     toString (L l) = l
 390     toString (Lit int) = toString int
 391     toString (Raw s) = s
 392
 393 instance toString SSMProgram where
 394     toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p