preliminary support for tasks

src/Convert/Traverse.hs

@@ -110,6 +110,9 @@ traverseStmtsM mapper = moduleItemMapper
         moduleItemMapper (MIPackageItem (Function lifetime ret name decls stmts)) = do
             stmts' <- mapM fullMapper stmts
             return $ MIPackageItem $ Function lifetime ret name decls stmts'
+        moduleItemMapper (MIPackageItem (Task lifetime name decls stmts)) = do
+            stmts' <- mapM fullMapper stmts
+            return $ MIPackageItem $ Task lifetime name decls stmts'
         moduleItemMapper (Initial stmt) =
             fullMapper stmt >>= return . Initial
         moduleItemMapper other = return $ other
@@ -298,6 +301,10 @@ traverseExprsM mapper = moduleItemMapper
         decls' <- mapM declMapper decls
         stmts' <- mapM stmtMapper stmts
         return $ MIPackageItem $ Function lifetime ret f decls' stmts'
+    moduleItemMapper (MIPackageItem (Task lifetime f decls stmts)) = do
+        decls' <- mapM declMapper decls
+        stmts' <- mapM stmtMapper stmts
+        return $ MIPackageItem $ Task lifetime f decls' stmts'
     moduleItemMapper (Instance m params x ml) = do
         if ml == Nothing
             then return $ Instance m params x Nothing
@@ -357,6 +364,9 @@ traverseDeclsM mapper item = do
         miMapperA (MIPackageItem (Function l t x decls s)) = do
             decls' <- mapM mapper decls
             return $ MIPackageItem $ Function l t x decls' s
+        miMapperA (MIPackageItem (Task l x decls s)) = do
+            decls' <- mapM mapper decls
+            return $ MIPackageItem $ Task l x decls' s
         miMapperA other = return other
         miMapperB (Block (Just (name, decls)) stmts) = do
             decls' <- mapM mapper decls
@@ -400,6 +410,8 @@ traverseTypesM mapper item =
             fullMapper t >>= \t' -> return $ Variable d t' x a me
         miMapper (MIPackageItem (Function l t x d s)) =
             fullMapper t >>= \t' -> return $ MIPackageItem $ Function l t' x d s
+        miMapper (MIPackageItem (other @ (Task _ _ _ _))) =
+            return $ MIPackageItem other
         miMapper other = return other
 
 traverseTypes :: Mapper Type -> Mapper ModuleItem

src/Language/SystemVerilog/AST.hs

@@ -53,6 +53,7 @@ type AST = [Description]
 data PackageItem
   = Typedef Type Identifier
   | Function (Maybe Lifetime) Type Identifier [Decl] [Stmt]
+  | Task     (Maybe Lifetime)      Identifier [Decl] [Stmt]
   | Comment String
   deriving Eq
 
@@ -62,6 +63,10 @@ instance Show PackageItem where
     printf "function %s%s%s;\n%s\n%s\nendfunction"
       (showLifetime ml) (showPad t) x (indent $ show i)
       (indent $ unlines' $ map show b)
+  show (Task ml x i b) =
+    printf "task %s%s;\n%s\n%s\nendtask"
+      (showLifetime ml) x (indent $ show i)
+      (indent $ unlines' $ map show b)
   show (Comment c) = "// " ++ c
 
 data Description

src/Language/SystemVerilog/Parser/Lex.x

@@ -71,6 +71,7 @@ tokens :-
   "endgenerate"      { tok KW_endgenerate  }
   "endinterface"     { tok KW_endinterface }
   "endmodule"        { tok KW_endmodule    }
+  "endtask"          { tok KW_endtask      }
   "enum"             { tok KW_enum         }
   "for"              { tok KW_for          }
   "forever"          { tok KW_forever      }
@@ -98,6 +99,7 @@ tokens :-
   "return"           { tok KW_return       }
   "static"           { tok KW_static       }
   "struct"           { tok KW_struct       }
+  "task"             { tok KW_task         }
   "typedef"          { tok KW_typedef      }
   "unique"           { tok KW_unique       }
   "while"            { tok KW_while        }

src/Language/SystemVerilog/Parser/Parse.y

@@ -36,6 +36,7 @@ import Language.SystemVerilog.Parser.Tokens
 "endgenerate"      { Token KW_endgenerate  _ _ }
 "endinterface"     { Token KW_endinterface _ _ }
 "endmodule"        { Token KW_endmodule    _ _ }
+"endtask"          { Token KW_endtask      _ _ }
 "enum"             { Token KW_enum         _ _ }
 "for"              { Token KW_for          _ _ }
 "forever"          { Token KW_forever      _ _ }
@@ -63,6 +64,7 @@ import Language.SystemVerilog.Parser.Tokens
 "return"           { Token KW_return       _ _ }
 "static"           { Token KW_static       _ _ }
 "struct"           { Token KW_struct       _ _ }
+"task"             { Token KW_task         _ _ }
 "typedef"          { Token KW_typedef      _ _ }
 "unique"           { Token KW_unique       _ _ }
 "while"            { Token KW_while        _ _ }
@@ -324,7 +326,8 @@ ModuleItem :: { [ModuleItem] }
 
 PackageItem :: { PackageItem }
   : "typedef" Type Identifier ";" { Typedef $2 $3 }
-  | "function" opt(Lifetime) FuncRetAndName FunctionItems DeclsAndStmts "endfunction" opt(Tag) { Function $2 (fst $3) (snd $3) (map defaultFuncInput $ $4 ++ fst $5) (snd $5) }
+  | "function" opt(Lifetime) FuncRetAndName TFItems DeclsAndStmts "endfunction" opt(Tag) { Function $2 (fst $3) (snd $3) (map defaultFuncInput $ (map makeInput $4) ++ fst $5) (snd $5) }
+  | "task" opt(Lifetime) Identifier TFItems DeclsAndStmts "endtask" opt(Tag) { Task $2 $3 (map defaultFuncInput $ $4 ++ fst $5) (snd $5) }
 
 FuncRetAndName :: { (Type, Identifier) }
   : {- empty -}        Identifier { (Implicit [], $1) }
@@ -345,8 +348,8 @@ ModuleInstantiation :: { (Identifier, Maybe [PortBinding]) }
   : Identifier "(" Bindings ")" { ($1, Just $3) }
   | Identifier "(" ".*"     ")" { ($1, Nothing) }
 
-FunctionItems :: { [Decl] }
-  : "(" DeclTokens(")") ";" { map makeInput $ parseDTsAsDecls $2 }
+TFItems :: { [Decl] }
+  : "(" DeclTokens(")") ";" { parseDTsAsDecls $2 }
   |                     ";" { [] }
 
 ParamType :: { Type }

src/Language/SystemVerilog/Parser/ParseDecl.hs

@@ -183,6 +183,8 @@ finalize (dir, typ, trips) =
 -- internal; entrypoint of the critical portion of our parser
 parseDTsAsComponents :: [DeclToken] -> [Component]
 parseDTsAsComponents [] = []
+parseDTsAsComponents [DTDir dir, DTIdent ident] =
+    [(dir, Implicit [], [(ident, [], Nothing)])]
 parseDTsAsComponents l0 =
     component : parseDTsAsComponents l4
     where