X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=gen.icl;h=d139804acf681111aa45a4279e72d4fc7bc3de00;hb=f081c2c5e248331eb6e2f090f4afe818fd8259eb;hp=a00275d6b5d14047dc2e2d8f7173061d2d7b7562;hpb=8472f6d9507fd0116ac85d02e8ed5566ef8e7980;p=cc1516.git

diff --git a/gen.icl b/gen.icl
index a00275d..d139804 100644
--- a/gen.icl
+++ b/gen.icl
@@ -39,24 +39,45 @@ FALSE :== 0
 labelStream :: [Label]
 labelStream = ["lbl_" +++ toString i\\i<-[1..]]
 
+defaultAddressBook :: Addressbook 
+defaultAddressBook = extend "print" (LAB "print")
+                        $ extend "read" (LAB "read")
+                        $ extend "isEmpty" (LAB "isEmpty")
+                        'Map'.newMap
+
 gen :: AST -> Either String String
-gen (AST fds) = case evalRWST prog () ('Map'.newMap, labelStream) of
+gen (AST fds) = case evalRWST prog () (defaultAddressBook, labelStream) of
             Left (Error e) = Left e
             Right (_, p) = Right $ toString p
     where
         prog = tell [
 			Instr "bsr" [L "main"] "",
 			Instr "halt" [] ""
-			] >>| mapM_ g fds
-
-//Current issues:
-//All VarDecls are added as function, how to deal with assignments?
-//  (And when we deal with assignments, how to deal with assignments to higher order functions?)
-//Dealing with arguments
-//Dealing with types that do not fit on the Stack
-//  Probably completely change LoadPlace to a Type and a position relative to *something*
-//  And where the type determines if this position is a pointer to the heap or an
-//  unboxed value
+			] >>| tell programContext
+            >>| mapM_ g fds
+
+programContext :: SSMProgram
+programContext =    [Lab "print" //there is no actual IO in SSM
+                    ,Instr "link" [Lit 0] ""
+                    ,Instr "unlink" [] ""
+                    ,Instr "ret" [] ""
+                    ,Lab "read" //there is no actual IO in SSM
+                    ,Instr "link" [Lit 0] ""
+                    ,Instr "ldc" [Lit 0] ""
+                    ,Instr "sth" [] ""
+                    ,Instr "str" [Raw "RR"] ""
+                    ,Instr "unlink" [] ""
+                    ,Instr "ret" [] ""
+                    ,Lab "isEmpty"
+                    ,Instr "link" [Lit 0] ""
+                    ,Instr "ldl" [Lit -2] "load prt to list"
+                    ,Instr "lda" [Lit 0] "derefrence ptr"
+                    ,Instr "ldc" [Lit 0] ""
+                    ,Instr "eq" [] "test for null pointer"
+                    ,Instr "str" [Raw "RR"] ""
+                    ,Instr "unlink" [] ""
+                    ,Instr "ret" [] ""
+                    ]
 
 //helper functions for the gen monad
 getAdressbook :: Gen Addressbook
@@ -121,8 +142,9 @@ instance g Expr where
 		Just (LAB t) = liftT (Left $ Error "PANIC: variable and function name clash")
 		//load k >>= \instr-> tell [instr] //note: pure is pure for list, i.e. []
     g (FunExpr _ k es fs) = 
-		mapM g es
+		mapM_ g es
 		>>| jump "bsr" k
+        >>| mapM_ (const $ tell [Instr "ajs" [Lit -1] ""]) es //clean up args
 		>>| tell [Instr "ldr" [Raw "RR"] ""]
 
 jump :: String String -> Gen ()
@@ -156,7 +178,10 @@ instance g Stmt where
             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
             Just (LAB t) = liftT (Left $ Error $ "PANIC: cannot assign to function")
             Just (ADDR t) = tell [Instr "stl" [Lit t] ""]
-    g (FunStmt k es) = mapM g es >>| jump "bsr" k
+    g (FunStmt k es) = mapM_ g es 
+        >>| jump "bsr" k
+        >>| mapM_ (const $ tell [Instr "ajs" [Lit -1] ""]) es //clean up args
+        >>| pure ()
     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 		>>| tell [Instr "ret" [] ""]
     g (ReturnStmt (Just e)) = g e
@@ -165,6 +190,7 @@ instance g Stmt where
 
 foldVarDecl :: Int VarDecl -> Gen Int
 foldVarDecl x (VarDecl _ _ k e) = g e 
+    >>| annote x k
 	>>| updateAdressbook (extend k (ADDR x)) >>| pure (x + 1)
 
 addVars :: [String] -> (Addressbook -> Addressbook)
@@ -179,12 +205,16 @@ instance g FunDecl where
 		updateAdressbook (addVars args) >>|
         tell [Lab k] >>|
 		tell [Instr "link" [Lit 0] ""] >>|
-        //then generate functions for the VarDecls
+        //add the vars
         foldM foldVarDecl 1 vds  >>|
-        //then the main function 
+        //and the statements
         mapM_ g stms >>|
         updateAdressbook (const oldMap) >>| pure ()
 
+annote :: Int String -> Gen ()
+annote pos key = 
+    tell [Instr "annote" [Raw "MP", Lit pos, Lit pos, Raw "green", Raw key] ""]
+
 class print a :: a -> [String]
 
 instance print Instr where