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     g (FunExpr _ k es fs) = getAdressbook >>= \ab->case 'Map'.get k ab of
 181                 //Identifier points to function
 182                 Just (LAB l arity fn) = if (arity <> (length es))
 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                         (       mapM_ g es
 194                                 >>| jump "bsr" k
 195                         >>| tell
 196                                         [Instr "ajs" [Lit $ ~(length es)] "Clean arguments"
 197                                         ,Instr "ldr" [Raw "RR"] ""])
 198                 //Identifier points to variable, thus higher order function
 199                 Just (ADDR t arity) = if (arity <> (length es))
 200                         ( fresh >>= \finish->
 201                           fresh >>= \start->
 202                                 tell
 203                                 [Instr "ldl" [Lit t] ""
 204                                 ,Instr "ldma" [Lit 0, Lit 2] "Load funcall and arity"
 205                                 ,Instr "ldc" [Lit $ length es] "Push extra arity on stack"
 206                                 ,Instr "add" [] "Increase arity"
 207                                 ,Instr "ldl" [Lit t] ""
 208                                 ,Instr "ldh" [Lit 1] "Load available arguments"
 209                                 ,Instr "str" [Raw "R5"] "Save available arguments"
 210                                 ,Lab start
 211                                 ,Instr "ldr" [Raw "R5"] "Load available arguments"
 212                                 ,Instr "ldc" [Lit 0] ""
 213                                 ,Instr "eq" [] ""
 214                                 ,Instr "brt" [L finish] ""
 215                                 ,Instr "ldc" [Lit 1] "Decrement available arguments"
 216                                 ,Instr "sub" [] ""
 217                                 ,Instr "str" [Raw "R5"] "Push available arguments"
 218                                 ,Instr "bra" [L start] ""
 219                                 ,Lab finish
 220                                 ]
 221                           >>| mapM_ g es )
 222                         ( fresh >>= \finish->
 223                           fresh >>= \start->
 224                           tell
 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
 231                                 ,Lab start
 232                                 ,Instr "ldr" [Raw "R5"] ""
 233                                 ,Instr "ldc" [Lit 0] ""
 234                                 ,Instr "eq" [] ""
 235                                 ,Instr "brt" [L finish] "Done pushing arg, bye"
 236                                 //Load heapadress
 237                                 ,Instr "ldl" [Lit t] ""
 238                                 ,Instr "ldr" [Raw "R6"] ""
 239                                 ,Instr "add" [] "Corrected heapaddress"
 240                                 ,Instr "ldh" [Lit 2] "Load argument"
 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 "ldl" [Lit t] ""
 257                                 ,Instr "ldh" [Lit 0] "Get function number"
 258                                 ,Instr "str" [Raw "R5"] ""
 259                                 ,Instr "bsr" [L "1func"] ""
 260                                 ,Instr "ldr" [Raw "MP"] ""
 261                                 ,Instr "ldc" [Lit t] ""
 262                                 ,Instr "add" [] ""
 263                                 ,Instr "str" [Raw "SP"] ""
 264                                 ,Instr "ldr" [Raw "RR"] ""
 265                                 ]
 266                         )
 267                 Nothing = liftT (Left $ Error "Undefined function!!!")
 268
 269 jump :: String String -> Gen ()
 270 jump instr k = getAdressbook >>= \ab->case 'Map'.get k ab of
 271         Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as function"])
 272         Just (LAB t _ _) = tell [Instr instr [L t] (k +++"()")]
 273         Just (ADDR t arity) = liftT (Left $ Error "Address as jump???")
 274
 275 instance g Stmt where
 276     g (IfStmt cond th el) =
 277         fresh >>= \elseLabel->
 278         fresh >>= \endLabel->
 279         g cond >>|
 280         tell [Instr "brf" [L elseLabel] "branch else"] >>|
 281         mapM_ g th >>|
 282         tell [Instr "bra" [L endLabel] "branch end if"] >>|
 283         tell [Lab elseLabel] >>|
 284         mapM_ g el  >>|
 285         tell [Lab endLabel]
 286     g (WhileStmt cond th) =
 287         fresh >>= \startLabel->
 288         fresh >>= \endLabel ->
 289         tell [Lab startLabel] >>|
 290         g cond >>|
 291         tell [Instr "brf" [L endLabel] "branch end while"] >>|
 292         mapM_ g th >>|
 293         tell [Instr "bra" [L startLabel] "branch start while"] >>|
 294         tell [Lab endLabel]
 295     g (AssStmt (VarDef k fs) e) =
 296         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
 297             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
 298             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
 299             Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
 300     g (FunStmt k es fs) = mapM_ g es
 301         >>| jump "bsr" k
 302         >>| tell [Instr "ajs" [Lit (~(length es))] ""] //clean up args
 303         >>| mapM_ g fs
 304                 >>| pure ()
 305     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 306                 >>| tell [Instr "ret" [] ""]
 307     g (ReturnStmt (Just e)) = g e
 308                 >>| tell [Instr "str" [Raw "RR"] ""]
 309                 >>| g (ReturnStmt Nothing)
 310
 311 foldVarDecl :: Int VarDecl -> Gen Int
 312 foldVarDecl x (VarDecl _ mt k e) = g e
 313     >>| annote x k
 314         >>| updateAdressbook (extend k (ADDR x $ arity $ fromJust mt))
 315         >>| pure (x + 1)
 316
 317 arity :: Type -> Int
 318 arity (_ ->> x) = 1 + arity x
 319 arity _ = 0
 320
 321 addVars :: Type [String] -> (Addressbook -> Addressbook)
 322 addVars _ [] = id
 323 addVars (t ->> ts) [x:xs] = \ab->
 324         extend x (ADDR (-2 - (length xs)) (arity t)) (addVars ts xs ab)
 325 addVars t [x] = \ab->
 326         extend x (ADDR -2 0) ab
 327
 328 instance g FunDecl where
 329     g (FunDecl _ k args mt vds stms) =
 330         //varDecls can call the enclosing function, so first reserve a label for it
 331         getAdressbook >>= \oldMap ->
 332                 updateAdressbook (addVars (fromJust mt) args) >>|
 333         tell [Lab k] >>|
 334                 tell [Instr "link" [Lit 0] ""] >>|
 335         //add the vars
 336         foldM foldVarDecl 1 vds  >>|
 337         //and the statements
 338         mapM_ g stms >>|
 339                 //Ugly hack to always return
 340                 g (ReturnStmt Nothing) >>|
 341         updateAdressbook (const oldMap) >>| pure ()
 342
 343 annote :: Int String -> Gen ()
 344 annote pos key =
 345     tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "green", Raw key] ""]
 346
 347 class print a :: a -> [String]
 348
 349 instance print Instr where
 350     print (Lab l) = [l, ":", "\n"]
 351     print (Instr i args com) = ["\t", i] ++ print args ++ [" ;", com, "\n"]
 352
 353 instance print [Arg] where
 354     print args = (map toString args)
 355
 356 instance toString Arg where
 357     toString (L l) = l
 358     toString (Lit int) = toString int
 359     toString (Raw s) = s
 360
 361 instance toString SSMProgram where
 362     toString p = concat $ intersperse " " $ map (\i-> concat $ intersperse " " $ print i) p