Added default functions, isEmpty does not typecheck...

[cc1516.git] / gen.icl

diff --git a/gen.icl b/gen.icl
index 89af77c..d139804 100644 (file)
--- 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
@@ -158,8 +179,9 @@ instance g Stmt where
             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 
-        >>| mapM_ (const $ tell [Instr "ajs" [Lit -1] ""]) es //clean up args
         >>| 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