From ff0c7b026cbc4c680aa41d6b8427029dbfcbde90 Mon Sep 17 00:00:00 2001
From: Zachary Snow <zach@zachjs.com>
Date: Fri, 2 Jul 2021 17:59:21 -0400
Subject: [PATCH] properly distinguish nets and variables internally

- new net decl to replace net pseudo-type
- support nets with complex base types, including typenames
- support var declaration type prefix for all data types
- support var as lone type shorthand
- refactor AST representation of strengths
- traversal helpers for treating nets as variables
- use decl traversals where appropriate
---
 src/Convert/Cast.hs                           |  6 ++
 src/Convert/DimensionQuery.hs                 |  1 -
 src/Convert/ImplicitNet.hs                    | 12 ++--
 src/Convert/Interface.hs                      | 30 ++++++----
 src/Convert/Logic.hs                          | 59 +++++++++++--------
 src/Convert/MultiplePacked.hs                 |  2 +
 src/Convert/Package.hs                        |  3 +
 src/Convert/ParamType.hs                      |  1 -
 src/Convert/Scoper.hs                         |  1 +
 src/Convert/Stream.hs                         |  1 +
 src/Convert/Struct.hs                         |  5 +-
 src/Convert/TFBlock.hs                        |  1 +
 src/Convert/Traverse.hs                       | 27 ++++++++-
 src/Convert/TypeOf.hs                         | 17 ++----
 src/Convert/Typedef.hs                        |  1 +
 src/Convert/UnbasedUnsized.hs                 |  3 +
 src/Convert/UnnamedGenBlock.hs                |  1 +
 src/Convert/UnpackedArray.hs                  |  3 +
 src/Convert/Unsigned.hs                       |  1 -
 src/Language/SystemVerilog/AST/Decl.hs        |  6 +-
 src/Language/SystemVerilog/AST/ModuleItem.hs  |  8 +--
 src/Language/SystemVerilog/AST/Type.hs        | 33 ++++-------
 src/Language/SystemVerilog/Parser/Parse.y     | 42 +++++++------
 .../SystemVerilog/Parser/ParseDecl.hs         | 53 +++++++++++++----
 test/core/net_or_var.sv                       | 22 +++++++
 test/core/net_or_var.v                        | 17 ++++++
 test/core/net_or_var.vh                       | 10 ++++
 test/core/port_typename.sv                    |  4 +-
 test/core/port_typename.v                     |  4 +-
 29 files changed, 249 insertions(+), 125 deletions(-)
 create mode 100644 test/core/net_or_var.sv
 create mode 100644 test/core/net_or_var.v
 create mode 100644 test/core/net_or_var.vh

diff --git a/src/Convert/Cast.hs b/src/Convert/Cast.hs
index 8f4c2b1..fbe01b1 100644
--- a/src/Convert/Cast.hs
+++ b/src/Convert/Cast.hs
@@ -61,6 +61,12 @@ traverseDeclM decl = do
                 else do
                     insertElem x Nil
                     return $ Variable d t x a e'
+        Net d n s t x a e -> do
+            enterStmt
+            e' <- traverseExprM e
+            exitStmt
+            insertElem x Nil
+            return $ Net d n s t x a e'
         Param _ _ x _ ->
             insertElem x Nil >> return decl
         ParamType    _ _ _ -> return decl
diff --git a/src/Convert/DimensionQuery.hs b/src/Convert/DimensionQuery.hs
index 885d367..d3df635 100644
--- a/src/Convert/DimensionQuery.hs
+++ b/src/Convert/DimensionQuery.hs
@@ -113,7 +113,6 @@ convertBits (Left t) =
     case elaborateType t of
         IntegerVector _ _ rs -> dimensionsSize rs
         Implicit        _ rs -> dimensionsSize rs
-        Net           _ _ rs -> dimensionsSize rs
         Struct   _ fields rs ->
             BinOp Mul
                 (dimensionsSize rs)
diff --git a/src/Convert/ImplicitNet.hs b/src/Convert/ImplicitNet.hs
index 7fa765e..7021802 100644
--- a/src/Convert/ImplicitNet.hs
+++ b/src/Convert/ImplicitNet.hs
@@ -40,6 +40,7 @@ traverseDeclM :: Decl -> Scoper () Decl
 traverseDeclM decl = do
     case decl of
         Variable _ _ x _ _ -> insertElem x ()
+        Net  _ _ _ _ x _ _ -> insertElem x ()
         Param _ _ x _ -> insertElem x ()
         ParamType{} -> return ()
         CommentDecl{} -> return ()
@@ -81,15 +82,14 @@ needsIdent defaultNetType x = do
     when (details == Nothing) $ do
         insertElem x ()
         injectItem decl
-    where
-        t = impliedNetType x defaultNetType Unspecified []
-        decl = MIPackageItem $ Decl $ Variable Local t x [] Nil
+    where decl = MIPackageItem $ Decl $ impliedNet x defaultNetType
 
-impliedNetType :: String -> DefaultNetType -> Signing -> [Range] -> Type
-impliedNetType var Nothing =
+impliedNet :: Identifier -> DefaultNetType -> Decl
+impliedNet var Nothing =
     error $ "implicit declaration of " ++
         show var ++ " but default_nettype is none"
-impliedNetType _ (Just netType) = Net (NetType netType)
+impliedNet var (Just netType) =
+    Net Local netType DefaultStrength UnknownType var [] Nil
 
 parseDefaultNetType :: String -> DefaultNetType
 parseDefaultNetType "tri"    = Just TTri
diff --git a/src/Convert/Interface.hs b/src/Convert/Interface.hs
index bad6aa2..d385e14 100644
--- a/src/Convert/Interface.hs
+++ b/src/Convert/Interface.hs
@@ -74,6 +74,7 @@ convertDescription parts (Part attrs extern Module lifetime name ports items) =
         traverseDeclM decl = do
             case decl of
                 Variable  _ _ x _ _ -> insertElem x DeclVal
+                Net   _ _ _ _ x _ _ -> insertElem x DeclVal
                 Param     _ _ x _   -> insertElem x DeclVal
                 ParamType _   x _   -> insertElem x DeclVal
                 CommentDecl{} -> return ()
@@ -324,10 +325,13 @@ convertDescription _ other = other
 -- produce the implicit modport decls for an interface bundle
 impliedModport :: [ModuleItem] -> [ModportDecl]
 impliedModport =
-    execWriter . mapM (collectNestedModuleItemsM collectModportDecls)
+    execWriter . mapM
+        (collectNestedModuleItemsM $ collectDeclsM collectModportDecls)
     where
-        collectModportDecls :: ModuleItem -> Writer [ModportDecl] ()
-        collectModportDecls (MIPackageItem (Decl (Variable _ _ x _ _))) =
+        collectModportDecls :: Decl -> Writer [ModportDecl] ()
+        collectModportDecls (Variable _ _ x _ _) =
+            tell [(Inout, x, Ident x)]
+        collectModportDecls (Net  _ _ _ _ x _ _) =
             tell [(Inout, x, Ident x)]
         collectModportDecls _ = return ()
 
@@ -384,15 +388,17 @@ inlineInstance global ranges modportBindings items partName
 
         rewriteItem :: ModuleItem -> ModuleItem
         rewriteItem =
+            traverseDecls $
             removeModportInstance .
             removeDeclDir .
-            traverseDecls overrideParam
+            overrideParam
 
         traverseDeclM :: Decl -> Scoper Expr Decl
         traverseDeclM decl = do
             decl' <- traverseDeclExprsM substituteExprM decl
             case decl' of
                 Variable  _ _ x _ _ -> insertElem x Nil
+                Net   _ _ _ _ x _ _ -> insertElem x Nil
                 Param     _ _ x e   -> insertElem x e
                 ParamType _   x _   -> insertElem x Nil
                 CommentDecl{} -> return ()
@@ -507,9 +513,8 @@ inlineInstance global ranges modportBindings items partName
                         ++ "\" resolvable when it wasn't previously"
                 _ -> id
 
-        removeModportInstance :: ModuleItem -> ModuleItem
-        removeModportInstance (MIPackageItem (Decl (Variable d t x a e))) =
-            MIPackageItem $ Decl $
+        removeModportInstance :: Decl -> Decl
+        removeModportInstance (Variable d t x a e) =
             if maybeModportBinding == Nothing then
                 Variable d t x a e
             else if makeBindingBaseExpr modportE == Nothing then
@@ -525,16 +530,17 @@ inlineInstance global ranges modportBindings items partName
                 bindingBaseExpr = Ident $ bindingBaseName ++ x
                 modportDims = a ++ snd (typeRanges t)
                 [modportDim] = modportDims
-
         removeModportInstance other = other
 
-        removeDeclDir :: ModuleItem -> ModuleItem
-        removeDeclDir (MIPackageItem (Decl (Variable _ t x a e))) =
-            MIPackageItem $ Decl $ Variable Local t' x a e
+        removeDeclDir :: Decl -> Decl
+        removeDeclDir (Variable _ t x a e) =
+            Variable Local t' x a e
             where t' = case t of
                     Implicit Unspecified rs ->
                         IntegerVector TLogic Unspecified rs
                     _ -> t
+        removeDeclDir decl @ Net{} =
+            traverseNetAsVar removeDeclDir decl
         removeDeclDir other = other
 
         -- capture the lower bound for each modport array binding
@@ -599,6 +605,8 @@ inlineInstance global ranges modportBindings items partName
         collectDeclDir (Variable dir _ ident _ _) =
             when (dir /= Local) $
                 tell $ Map.singleton ident dir
+        collectDeclDir net @ Net{} =
+            collectNetAsVarM collectDeclDir net
         collectDeclDir _ = return ()
         findDeclDir :: Identifier -> Direction
         findDeclDir ident =
diff --git a/src/Convert/Logic.hs b/src/Convert/Logic.hs
index e912500..3ebbf88 100644
--- a/src/Convert/Logic.hs
+++ b/src/Convert/Logic.hs
@@ -63,6 +63,8 @@ convert =
                 (_, InterfaceT{}) -> tell [(ident, Local)]
                 (Local, _) -> return ()
                 _ -> tell [(ident, dir)]
+        collectDeclDirsM (MIPackageItem (Decl net @ Net{})) =
+            collectNetAsVarM (collectDeclDirsM . MIPackageItem . Decl) net
         collectDeclDirsM _ = return ()
 
 convertDescription :: Ports -> Description -> Description
@@ -112,13 +114,14 @@ traverseModuleItem ports scopes =
                 then Assign AssignOptionNone lhs expr
                 else
                     Generate $ map GenModuleItem
-                    [ MIPackageItem (Decl (Variable Local t x [] Nil))
+                    [ MIPackageItem $ Decl decl
                     , Assign AssignOptionNone (LHSIdent x) expr
                     , always_comb $ Asgn AsgnOpEq Nothing lhs (Ident x)
                     ]
             where
-                t = Net (NetType TWire) Unspecified
-                        [(DimsFn FnBits $ Right $ lhsToExpr lhs, RawNum 1)]
+                decl = Net Local TWire DefaultStrength t x [] Nil
+                t = Implicit Unspecified [r]
+                r = (DimsFn FnBits $ Right $ lhsToExpr lhs, RawNum 1)
                 x = "sv2v_tmp_" ++ shortHash (lhs, expr)
         -- rewrite port bindings to use temporary nets where necessary
         fixModuleItem (Instance moduleName params instanceName rs bindings) =
@@ -143,10 +146,11 @@ traverseModuleItem ports scopes =
                         portDir = maybeModulePorts >>= lookup portName
                         tmp = "sv2v_tmp_" ++ instanceName ++ "_" ++ portName
                         tmpExpr = Ident tmp
-                        t = Net (NetType TWire) Unspecified
-                                [(DimsFn FnBits $ Right expr, RawNum 1)]
+                        decl = Net Local TWire DefaultStrength t tmp [] Nil
+                        t = Implicit Unspecified [r]
+                        r = (DimsFn FnBits $ Right expr, RawNum 1)
                         items =
-                            [ MIPackageItem $ Decl $ Variable Local t tmp [] Nil
+                            [ MIPackageItem $ Decl decl
                             , always_comb $ Asgn AsgnOpEq Nothing lhs tmpExpr]
                         lhs = case exprToLHS expr of
                             Just l -> l
@@ -160,26 +164,35 @@ traverseModuleItem ports scopes =
 traverseDeclM :: Decl -> ST Decl
 traverseDeclM (decl @ (Variable _ t x _ _)) =
     insertElem x t >> return decl
+traverseDeclM (decl @ (Net _ _ _ t x _ _)) =
+    insertElem x t >> return decl
 traverseDeclM decl = return decl
 
 rewriteDeclM :: Decl -> ST Decl
-rewriteDeclM (Variable d t x a e) = do
-    (d', t') <- case t of
-        IntegerVector TLogic sg rs -> do
-            insertElem x t
-            details <- lookupElemM x
-            let Just (accesses, _, _) = details
-            let location = map accessName accesses
-            usedAsReg <- lift $ gets $ Set.member location
-            blockLogic <- withinProcedureM
-            if usedAsReg || blockLogic || e /= Nil
-                then do
-                    let dir = if d == Inout then Output else d
-                    return (dir, IntegerVector TReg sg rs)
-                else return (d, Net (NetType TWire) sg rs)
-        _ -> return (d, t)
-    insertElem x t'
-    return $ Variable d' t' x a e
+rewriteDeclM (Variable d (t @ (IntegerVector TLogic sg rs)) x a e) = do
+    insertElem x t
+    details <- lookupElemM x
+    let Just (accesses, _, _) = details
+    let location = map accessName accesses
+    usedAsReg <- lift $ gets $ Set.member location
+    blockLogic <- withinProcedureM
+    if usedAsReg || blockLogic || e /= Nil
+        then do
+            let d' = if d == Inout then Output else d
+            let t' = IntegerVector TReg sg rs
+            insertElem x t'
+            return $ Variable d' t' x a e
+        else do
+            let t' = Implicit sg rs
+            insertElem x t'
+            return $ Net d TWire DefaultStrength t' x a e
+rewriteDeclM (decl @ (Variable _ t x _ _)) =
+    insertElem x t >> return decl
+rewriteDeclM (Net d n s (IntegerVector _ sg rs) x a e) =
+    insertElem x t >> return (Net d n s t x a e)
+    where t = Implicit sg rs
+rewriteDeclM (decl @ (Net _ _ _ t x _ _)) =
+    insertElem x t >> return decl
 rewriteDeclM (Param s (IntegerVector _ sg []) x e) =
     return $ Param s (Implicit sg [(zero, zero)]) x e
     where zero = RawNum 0
diff --git a/src/Convert/MultiplePacked.hs b/src/Convert/MultiplePacked.hs
index b8f403b..705f51f 100644
--- a/src/Convert/MultiplePacked.hs
+++ b/src/Convert/MultiplePacked.hs
@@ -52,6 +52,8 @@ traverseDeclM :: Decl -> Scoper TypeInfo Decl
 traverseDeclM (Variable dir t ident a e) = do
     t' <- traverseTypeM t a ident
     traverseDeclExprsM traverseExprM $ Variable dir t' ident a e
+traverseDeclM net @ Net{} =
+    traverseNetAsVarM traverseDeclM net
 traverseDeclM (Param s t ident e) = do
     t' <- traverseTypeM t [] ident
     traverseDeclExprsM traverseExprM $ Param s t' ident e
diff --git a/src/Convert/Package.hs b/src/Convert/Package.hs
index e7f13a3..f7ad77c 100644
--- a/src/Convert/Package.hs
+++ b/src/Convert/Package.hs
@@ -314,6 +314,7 @@ processItems topName packageName moduleItems = do
                     >>= traverseDeclExprsM traverseExprM
             case decl' of
                 Variable d t x a e -> declHelp x $ \x' -> Variable d t x' a e
+                Net  d n s t x a e -> declHelp x $ \x' -> Net  d n s t x' a e
                 Param    p t x   e -> declHelp x $ \x' -> Param    p t x'   e
                 ParamType  p x   t -> declHelp x $ \x' -> ParamType  p x'   t
                 CommentDecl c -> return $ CommentDecl c
@@ -660,6 +661,7 @@ writeDeclIdents :: Decl -> IdentWriter Decl
 writeDeclIdents decl = do
     case decl of
         Variable _ _ x _ _ -> insertElem x ()
+        Net  _ _ _ _ x _ _ -> insertElem x ()
         Param    _ _ x   _ -> insertElem x ()
         ParamType  _ x   _ -> insertElem x ()
         CommentDecl{} -> return ()
@@ -744,6 +746,7 @@ piNames (Decl (ParamType _ ident (Enum _ enumItems _))) =
 piNames (Function _ _ ident _ _) = [ident]
 piNames (Task     _   ident _ _) = [ident]
 piNames (Decl (Variable _ _ ident _ _)) = [ident]
+piNames (Decl (Net  _ _ _ _ ident _ _)) = [ident]
 piNames (Decl (Param    _ _ ident   _)) = [ident]
 piNames (Decl (ParamType  _ ident   _)) = [ident]
 piNames (Decl (CommentDecl          _)) = []
diff --git a/src/Convert/ParamType.hs b/src/Convert/ParamType.hs
index a6d472e..68b384e 100644
--- a/src/Convert/ParamType.hs
+++ b/src/Convert/ParamType.hs
@@ -224,7 +224,6 @@ isSimpleType typ =
         IntegerVector{} -> True
         IntegerAtom  {} -> True
         NonInteger   {} -> True
-        Net          {} -> True
         Implicit     {} -> True
         Struct _ fields _ -> all (isSimpleType . fst) fields
         Union  _ fields _ -> all (isSimpleType . fst) fields
diff --git a/src/Convert/Scoper.hs b/src/Convert/Scoper.hs
index 929738e..a8fa799 100644
--- a/src/Convert/Scoper.hs
+++ b/src/Convert/Scoper.hs
@@ -451,6 +451,7 @@ scopeModuleItemT declMapper moduleItemMapper genItemMapper stmtMapper =
                     if d == Local
                         then Nothing
                         else Just $ \i -> Variable d t (show i) a e
+                argIdxDecl Net{} = Nothing
                 argIdxDecl Param{} = Nothing
                 argIdxDecl ParamType{} = Nothing
                 argIdxDecl CommentDecl{} = Nothing
diff --git a/src/Convert/Stream.hs b/src/Convert/Stream.hs
index d8ab790..67f0fbc 100644
--- a/src/Convert/Stream.hs
+++ b/src/Convert/Stream.hs
@@ -36,6 +36,7 @@ traverseDeclM (Variable d t x [] (expr @ (Stream StreamL chunk exprs))) = do
         fnName = streamerFuncName x
         func = streamerFunc fnName chunk (TypeOf $ Concat exprs) t
         expr' = Call (Ident fnName) (Args [Concat exprs] [])
+traverseDeclM decl @ Net{} = traverseNetAsVarM traverseDeclM decl
 traverseDeclM decl = return decl
 
 traverseModuleItemM :: ModuleItem -> Scoper () ModuleItem
diff --git a/src/Convert/Struct.hs b/src/Convert/Struct.hs
index 23ac1b4..354d9e3 100644
--- a/src/Convert/Struct.hs
+++ b/src/Convert/Struct.hs
@@ -105,6 +105,8 @@ convertType t1 =
 
 -- write down the types of declarations
 traverseDeclM :: Decl -> Scoper Type Decl
+traverseDeclM decl @ Net{} =
+    traverseNetAsVarM traverseDeclM decl
 traverseDeclM decl = do
     decl' <- case decl of
         Variable d t x a e -> do
@@ -119,8 +121,7 @@ traverseDeclM decl = do
             let e' = convertExpr t e
             let t' = convertType t
             return $ Param s t' x e'
-        ParamType{} -> return decl
-        CommentDecl{} -> return decl
+        _ -> return decl
     traverseDeclExprsM traverseExprM decl'
     where
         isRangeable :: Type -> Bool
diff --git a/src/Convert/TFBlock.hs b/src/Convert/TFBlock.hs
index 3d0ab3d..5fb2b78 100644
--- a/src/Convert/TFBlock.hs
+++ b/src/Convert/TFBlock.hs
@@ -66,6 +66,7 @@ declNames = filter (not . null) . map declName
 
 declName :: Decl -> Identifier
 declName (Variable _ _ x _ _) = x
+declName (Net  _ _ _ _ x _ _) = x
 declName (Param _ _ x _) = x
 declName (ParamType _ x _) = x
 declName CommentDecl{} = ""
diff --git a/src/Convert/Traverse.hs b/src/Convert/Traverse.hs
index 4b11dde..e9df917 100644
--- a/src/Convert/Traverse.hs
+++ b/src/Convert/Traverse.hs
@@ -101,6 +101,9 @@ module Convert.Traverse
 , traverseSinglyNestedStmtsM
 , traverseSinglyNestedStmts
 , collectSinglyNestedStmtsM
+, traverseNetAsVarM
+, traverseNetAsVar
+, collectNetAsVarM
 ) where
 
 import Data.Functor.Identity (Identity, runIdentity)
@@ -576,7 +579,7 @@ traverseNodesM exprMapper declMapper typeMapper lhsMapper stmtMapper =
     moduleItemMapper (Assign opt lhs expr) = do
         opt' <- case opt of
             AssignOptionNone -> return $ AssignOptionNone
-            AssignOptionDrive ds -> return $ AssignOptionDrive ds
+            AssignOptionDrive s0 s1 -> return $ AssignOptionDrive s0 s1
             AssignOptionDelay delay ->
                 exprMapper delay >>= return . AssignOptionDelay
         lhs' <- lhsMapper lhs
@@ -814,7 +817,6 @@ traverseSinglyNestedTypesM mapper = tm
             vals' <- mapM typeOrExprMapper $ map snd pm
             let pm' = zip (map fst pm) vals'
             return $ CSAlias ps pm' xx rs
-        tm (Net           kw sg rs) = return $ Net           kw sg rs
         tm (Implicit         sg rs) = return $ Implicit         sg rs
         tm (IntegerVector kw sg rs) = return $ IntegerVector kw sg rs
         tm (IntegerAtom   kw sg   ) = return $ IntegerAtom   kw sg
@@ -946,6 +948,11 @@ traverseDeclExprsM exprMapper =
             a' <- mapM (mapBothM exprMapper) a
             e' <- exprMapper e
             return $ Variable d t' x a' e'
+        declMapper (Net d n s t x a e) = do
+            t' <- typeMapper t
+            a' <- mapM (mapBothM exprMapper) a
+            e' <- exprMapper e
+            return $ Net d n s t' x a' e'
         declMapper (CommentDecl c) =
             return $ CommentDecl c
 
@@ -961,6 +968,8 @@ traverseDeclTypesM mapper (ParamType s x t) =
     mapper t >>= \t' -> return $ ParamType s x t'
 traverseDeclTypesM mapper (Variable d t x a e) =
     mapper t >>= \t' -> return $ Variable d t' x a e
+traverseDeclTypesM mapper (Net d n s t x a e) =
+    mapper t >>= \t' -> return $ Net d n s t' x a e
 traverseDeclTypesM _ (CommentDecl c) = return $ CommentDecl c
 
 traverseDeclTypes :: Mapper Type -> Mapper Decl
@@ -1128,3 +1137,17 @@ traverseFiles
 traverseFiles fileCollectorM fileMapper files =
     runIdentity (traverseFilesM fileCollectorM fileMapperM  files)
     where fileMapperM = (\w -> return . fileMapper w)
+
+traverseNetAsVarM :: Monad m => MapperM m Decl -> MapperM m Decl
+traverseNetAsVarM func net = do
+    let Net d n s t x a e = net
+    let var = Variable d t x a e
+    var' <- func var
+    let Variable d' t' x' a' e' = var'
+    let net' = Net d' n s t' x' a' e'
+    return net'
+
+traverseNetAsVar :: Mapper Decl -> Mapper Decl
+traverseNetAsVar = unmonad traverseNetAsVarM
+collectNetAsVarM :: Monad m => CollectorM m Decl -> CollectorM m Decl
+collectNetAsVarM = collectify traverseNetAsVarM
diff --git a/src/Convert/TypeOf.hs b/src/Convert/TypeOf.hs
index 0963f5b..30d6fc1 100644
--- a/src/Convert/TypeOf.hs
+++ b/src/Convert/TypeOf.hs
@@ -41,6 +41,8 @@ type ST = Scoper Type
 
 -- insert the given declaration into the scope, and convert an TypeOfs within
 traverseDeclM :: Decl -> ST Decl
+traverseDeclM decl @ Net{} =
+    traverseNetAsVarM traverseDeclM decl
 traverseDeclM decl = do
     decl' <- traverseDeclExprsM traverseExprM decl
         >>= traverseDeclTypesM traverseTypeM
@@ -65,8 +67,7 @@ traverseDeclM decl = do
             where t' = IntegerVector TLogic sg rs
         Param _ t ident _ ->
             insertType ident t >> return decl'
-        ParamType{} -> return decl'
-        CommentDecl{} -> return decl'
+        _ -> return decl'
 
 -- rewrite and store a non-genvar data declaration's type information
 insertType :: Identifier -> Type -> ST ()
@@ -155,13 +156,8 @@ lookupTypeOf expr = do
                     then IntegerAtom TInteger Unspecified
                     else TypeOf expr
             _ -> return $ TypeOf expr
-        Just (_, replacements, typ) -> do
-            let typ' = toVarType typ
-            return $ replaceInType replacements typ'
-    where
-        toVarType :: Type -> Type
-        toVarType (Net _ sg rs) = IntegerVector TLogic sg rs
-        toVarType other = other
+        Just (_, replacements, typ) ->
+            return $ replaceInType replacements typ
 
 -- determines the type of an expression based on the available scope information
 -- according the semantics defined in IEEE 1800-2017, especially Section 11.6
@@ -248,7 +244,6 @@ typeSignednessOverride fallback sg t =
     case t of
         IntegerVector base _ rs -> IntegerVector base sg rs
         IntegerAtom   base _    -> IntegerAtom   base sg
-        Net           base _ rs -> Net           base sg rs
         _ -> fallback
 
 -- type of a unary operator expression
@@ -319,7 +314,6 @@ binopSignedness Signed Signed = Signed
 
 -- returns the signedness of the given type, if possible
 typeSignedness :: Type -> Signing
-typeSignedness (Net           _ sg _) = signednessFallback Unsigned sg
 typeSignedness (IntegerVector _ sg _) = signednessFallback Unsigned sg
 typeSignedness (IntegerAtom   t sg  ) = signednessFallback fallback sg
     where fallback = if t == TTime then Unsigned else Signed
@@ -389,7 +383,6 @@ typeCastUnneeded t1 t2 =
         sz1 = typeSize t1
         sz2 = typeSize t2
         typeSize :: Type -> Maybe Expr
-        typeSize (Net           _ _ rs) = Just $ dimensionsSize rs
         typeSize (IntegerVector _ _ rs) = Just $ dimensionsSize rs
         typeSize (t @ IntegerAtom{}) =
             typeSize $ tf [(RawNum 1, RawNum 1)]
diff --git a/src/Convert/Typedef.hs b/src/Convert/Typedef.hs
index c1ce1c7..799df7d 100644
--- a/src/Convert/Typedef.hs
+++ b/src/Convert/Typedef.hs
@@ -76,6 +76,7 @@ traverseDeclM decl = do
         >>= traverseDeclTypesM traverseTypeM
     case decl' of
         Variable{} -> return decl'
+        Net{} -> return decl'
         Param _ _ x _ ->
             insertElem x UnknownType >> return decl'
         ParamType Localparam x t -> do
diff --git a/src/Convert/UnbasedUnsized.hs b/src/Convert/UnbasedUnsized.hs
index 13e74c2..84163eb 100644
--- a/src/Convert/UnbasedUnsized.hs
+++ b/src/Convert/UnbasedUnsized.hs
@@ -105,6 +105,9 @@ determinePortSize portName instanceParams moduleItems =
                 then substituteExpr (reverse mapping) size
                 else step mapping rest
             where size = BinOp Mul (dimensionsSize a) (DimsFn FnBits $ Left t)
+        step mapping (MIPackageItem (Decl (Net d _ _ t x a e)) : rest) =
+            step mapping $ item : rest
+            where item = MIPackageItem $ Decl $ Variable d t x a e
         step mapping (_ : rest) = step mapping rest
         step _ [] = error $ "could not find size of port " ++ portName
 
diff --git a/src/Convert/UnnamedGenBlock.hs b/src/Convert/UnnamedGenBlock.hs
index 36b753e..5f84547 100644
--- a/src/Convert/UnnamedGenBlock.hs
+++ b/src/Convert/UnnamedGenBlock.hs
@@ -48,6 +48,7 @@ traverseDeclM :: Decl -> S Decl
 traverseDeclM decl =
     case decl of
         Variable  _ _ x _ _ -> declaration x decl
+        Net   _ _ _ _ x _ _ -> declaration x decl
         Param     _ _ x _   -> declaration x decl
         ParamType _   x _   -> declaration x decl
         CommentDecl{} -> return decl
diff --git a/src/Convert/UnpackedArray.hs b/src/Convert/UnpackedArray.hs
index 0239759..8ab7849 100644
--- a/src/Convert/UnpackedArray.hs
+++ b/src/Convert/UnpackedArray.hs
@@ -44,6 +44,8 @@ traverseDeclM ports (decl @ (Variable _ _ x _ e)) = do
         then flatUsageM x
         else return ()
     return decl
+traverseDeclM ports decl @ Net{} =
+    traverseNetAsVarM (traverseDeclM ports) decl
 traverseDeclM _ other = return other
 
 -- pack decls marked for packing
@@ -62,6 +64,7 @@ rewriteDeclM (decl @ (Variable d t x a e)) = do
             let t' = tf $ shifted ++ rs
             return $ Variable d t' x rest e
         Nothing -> return decl
+rewriteDeclM decl @ Net{} = traverseNetAsVarM rewriteDeclM decl
 rewriteDeclM other = return other
 
 traverseModuleItemM :: ModuleItem -> ST ModuleItem
diff --git a/src/Convert/Unsigned.hs b/src/Convert/Unsigned.hs
index cb11928..ba9ad4d 100644
--- a/src/Convert/Unsigned.hs
+++ b/src/Convert/Unsigned.hs
@@ -23,7 +23,6 @@ convert =
 convertType :: Type -> Type
 convertType (Implicit        Unsigned rs) = Implicit        Unspecified rs
 convertType (IntegerVector t Unsigned rs) = IntegerVector t Unspecified rs
-convertType (Net           t Unsigned rs) = Net           t Unspecified rs
 convertType (IntegerAtom TInteger Unsigned) =
     IntegerVector TReg Unspecified [(RawNum 31, RawNum 0)]
 convertType other = other
diff --git a/src/Language/SystemVerilog/AST/Decl.hs b/src/Language/SystemVerilog/AST/Decl.hs
index e980b87..31b082e 100644
--- a/src/Language/SystemVerilog/AST/Decl.hs
+++ b/src/Language/SystemVerilog/AST/Decl.hs
@@ -16,14 +16,15 @@ module Language.SystemVerilog.AST.Decl
 import Data.List (intercalate)
 import Text.Printf (printf)
 
-import Language.SystemVerilog.AST.ShowHelp (showPad, unlines')
-import Language.SystemVerilog.AST.Type (Type(TypedefRef, UnpackedType), Identifier, pattern UnknownType)
+import Language.SystemVerilog.AST.ShowHelp (showPad, showPadBefore, unlines')
+import Language.SystemVerilog.AST.Type (Type(TypedefRef, UnpackedType), Identifier, pattern UnknownType, NetType, Strength)
 import Language.SystemVerilog.AST.Expr (Expr, Range, showRanges, showAssignment)
 
 data Decl
     = Param     ParamScope Type Identifier Expr
     | ParamType ParamScope Identifier Type
     | Variable   Direction Type Identifier [Range] Expr
+    | Net Direction NetType Strength Type Identifier [Range] Expr
     | CommentDecl String
     deriving Eq
 
@@ -37,6 +38,7 @@ instance Show Decl where
     show (ParamType s x t) = printf "%s type %s%s;" (show s) x tStr
         where tStr = if t == UnknownType then "" else  " = " ++ show t
     show (Variable d t x a e) = printf "%s%s%s%s%s;" (showPad d) (showPad t) x (showRanges a) (showAssignment e)
+    show (Net  d n s t x a e) = printf "%s%s%s %s%s%s%s;" (showPad d) (show n) (showPadBefore s) (showPad t) x (showRanges a) (showAssignment e)
     show (CommentDecl c) =
         if elem '\n' c
             then "// " ++ show c
diff --git a/src/Language/SystemVerilog/AST/ModuleItem.hs b/src/Language/SystemVerilog/AST/ModuleItem.hs
index bf5abdd..fbd48d7 100644
--- a/src/Language/SystemVerilog/AST/ModuleItem.hs
+++ b/src/Language/SystemVerilog/AST/ModuleItem.hs
@@ -28,7 +28,7 @@ import Language.SystemVerilog.AST.Expr (Expr(Nil), pattern Ident, Range, showRan
 import Language.SystemVerilog.AST.GenItem (GenItem)
 import Language.SystemVerilog.AST.LHS (LHS)
 import Language.SystemVerilog.AST.Stmt (Stmt, AssertionItem, Timing(Delay))
-import Language.SystemVerilog.AST.Type (Identifier, DriveStrength)
+import Language.SystemVerilog.AST.Type (Identifier, Strength0, Strength1)
 
 data ModuleItem
     = MIAttr     Attr ModuleItem
@@ -140,11 +140,11 @@ instance Show NOutputGateKW where
 
 data AssignOption
     = AssignOptionNone
-    | AssignOptionDelay  Expr
-    | AssignOptionDrive  DriveStrength
+    | AssignOptionDelay Expr
+    | AssignOptionDrive Strength0 Strength1
     deriving Eq
 
 instance Show AssignOption where
     show AssignOptionNone = ""
     show (AssignOptionDelay de) = printf "#(%s)" (show de)
-    show (AssignOptionDrive ds) = show ds
+    show (AssignOptionDrive s0 s1) = printf "(%s, %s)" (show s0) (show s1)
diff --git a/src/Language/SystemVerilog/AST/Type.hs b/src/Language/SystemVerilog/AST/Type.hs
index 4aa320c..be784d1 100644
--- a/src/Language/SystemVerilog/AST/Type.hs
+++ b/src/Language/SystemVerilog/AST/Type.hs
@@ -17,8 +17,7 @@ module Language.SystemVerilog.AST.Type
     , IntegerVectorType  (..)
     , IntegerAtomType    (..)
     , NonIntegerType     (..)
-    , NetTypeAndStrength (..)
-    , DriveStrength      (..)
+    , Strength           (..)
     , Strength0          (..)
     , Strength1          (..)
     , ChargeStrength     (..)
@@ -41,7 +40,6 @@ data Type
     = IntegerVector IntegerVectorType  Signing [Range]
     | IntegerAtom   IntegerAtomType    Signing
     | NonInteger    NonIntegerType
-    | Net           NetTypeAndStrength Signing [Range]
     | Implicit                         Signing [Range]
     | Alias               Identifier           [Range]
     | PSAlias  Identifier Identifier           [Range]
@@ -59,7 +57,6 @@ instance Show Type where
     show (Alias         xx    rs) = printf "%s%s" xx (showRanges rs)
     show (PSAlias ps    xx    rs) = printf "%s::%s%s" ps xx (showRanges rs)
     show (CSAlias ps pm xx    rs) = printf "%s#%s::%s%s" ps (showParams pm) xx (showRanges rs)
-    show (Net           kw sg rs) = printf "%s%s%s" (show kw) (showPadBefore sg) (showRanges rs)
     show (Implicit         sg rs) = printf "%s%s"             (showPad       sg) (dropWhile (== ' ') $ showRanges rs)
     show (IntegerVector kw sg rs) = printf "%s%s%s" (show kw) (showPadBefore sg) (showRanges rs)
     show (IntegerAtom   kw sg   ) = printf "%s%s"   (show kw) (showPadBefore sg)
@@ -101,7 +98,6 @@ instance Eq (Signing -> [Range] -> Type) where
 typeRanges :: Type -> ([Range] -> Type, [Range])
 typeRanges typ =
     case typ of
-        Net           kw sg rs -> (Net           kw sg, rs)
         Implicit         sg rs -> (Implicit         sg, rs)
         IntegerVector kw sg rs -> (IntegerVector kw sg, rs)
         Enum            t v rs -> (Enum            t v, rs)
@@ -237,22 +233,15 @@ instance Show Packing where
     show (Unpacked) = ""
     show (Packed s) = "packed" ++ (showPadBefore s)
 
-data NetTypeAndStrength
-    = NetType       NetType
-    | NetTypeDrive  NetType DriveStrength
-    | NetTypeCharge NetType ChargeStrength
+data Strength
+    = DefaultStrength
+    | DriveStrength Strength0 Strength1
+    | ChargeStrength ChargeStrength
     deriving (Eq, Ord)
 
-instance Show NetTypeAndStrength where
-    show (NetType       nt   ) = show nt
-    show (NetTypeDrive  nt ds) = printf "%s %s" (show nt) (show ds)
-    show (NetTypeCharge nt cs) = printf "%s %s" (show nt) (show cs)
-
-data DriveStrength
-    = DriveStrength Strength0 Strength1
-    deriving (Eq, Ord)
-
-instance Show DriveStrength where
+instance Show Strength where
+    show DefaultStrength = ""
+    show (ChargeStrength cs) = printf "(%s)" (show cs)
     show (DriveStrength s0 s1) = printf "(%s, %s)" (show s0) (show s1)
 
 data Strength0
@@ -292,6 +281,6 @@ data ChargeStrength
     deriving (Eq, Ord)
 
 instance Show ChargeStrength where
-    show Small  = "(small)"
-    show Medium = "(medium)"
-    show Large  = "(large)"
+    show Small  = "small"
+    show Medium = "medium"
+    show Large  = "large"
diff --git a/src/Language/SystemVerilog/Parser/Parse.y b/src/Language/SystemVerilog/Parser/Parse.y
index 7b51761..5f1e8bd 100644
--- a/src/Language/SystemVerilog/Parser/Parse.y
+++ b/src/Language/SystemVerilog/Parser/Parse.y
@@ -399,6 +399,8 @@ time               { Token Lit_time        _ _ }
 
 
 -- operator precedences, from *lowest* to *highest*
+%nonassoc DefaultStrength
+%nonassoc DriveStrength ChargeStrength
 %nonassoc Asgn
 %nonassoc NoElse
 %nonassoc "else"
@@ -456,16 +458,11 @@ TypeAlias :: { Type }
   :                               Identifier Dimensions { Alias   $1       $2 }
   | Identifier               "::" Identifier Dimensions { PSAlias $1    $3 $4 }
   | Identifier ParamBindings "::" Identifier Dimensions { CSAlias $1 $2 $4 $5 }
-PartialTypeAlias :: { Signing -> [Range] -> Type }
-  :                               Identifier { \Unspecified -> Alias   $1       }
-  | Identifier               "::" Identifier { \Unspecified -> PSAlias $1    $3 }
-  | Identifier ParamBindings "::" Identifier { \Unspecified -> CSAlias $1 $2 $4 }
 TypeNonIdent :: { Type }
   : PartialType OptSigning Dimensions { $1 $2 $3 }
   | "type" "(" Expr ")" { TypeOf $3 }
 PartialType :: { Signing -> [Range] -> Type }
-  : NetTypeAndStrength                      {                        Net           $1    }
-  | IntegerVectorType                       {                        IntegerVector $1    }
+  : IntegerVectorType                       {                        IntegerVector $1    }
   | IntegerAtomType                         { \sg          -> \[] -> IntegerAtom   $1 sg }
   | NonIntegerType                          { \Unspecified -> \[] -> NonInteger    $1    }
   | "enum" EnumBaseType "{" EnumItems   "}" { \Unspecified -> Enum   $2 $4 }
@@ -480,11 +477,6 @@ EnumBaseType :: { Type }
   : Type       { $1 }
   | Dimensions { Implicit Unspecified $1 }
 
-NetTypeAndStrength :: { NetTypeAndStrength }
-  : NetType                %prec "+" { NetType       $1    }
-  | NetType DriveStrength  %prec "*" { NetTypeDrive  $1 $2 }
-  | NetType ChargeStrength %prec "*" { NetTypeCharge $1 $2 }
-
 Signing :: { Signing }
   : "signed"   { Signed   }
   | "unsigned" { Unsigned }
@@ -623,6 +615,11 @@ Identifiers :: { [Identifier] }
   :                 Identifier { [$1] }
   | Identifiers "," Identifier { $1 ++ [$3] }
 
+Strength :: { Strength }
+  : {- empty -}    %prec DefaultStrength { DefaultStrength }
+  | DriveStrength  %prec DriveStrength   { uncurry DriveStrength $1 }
+  | ChargeStrength %prec ChargeStrength  { ChargeStrength $1 }
+
 -- uses delimiter propagation hack to avoid conflicts
 DeclTokens(delim) :: { [DeclToken] }
   : DeclTokensBase(DeclTokens(delim), delim) { $1 }
@@ -635,21 +632,22 @@ DeclTokensBase(repeat, delim) :: { [DeclToken] }
 DeclToken :: { DeclToken }
   : ","                                {% posInject \p -> DTComma    p }
   | "[" "]"                            {% posInject \p -> DTAutoDim  p }
+  | "const"                            {% posInject \p -> DTConst    p }
+  | "var"                              {% posInject \p -> DTVar      p }
   | PartSelect                         {% posInject \p -> DTRange    p $1 }
   | Identifier                         {% posInject \p -> DTIdent    p $1 }
   | Direction                          {% posInject \p -> DTDir      p $1 }
   | "[" Expr "]"                       {% posInject \p -> DTBit      p $2 }
   | LHSConcat                          {% posInject \p -> DTConcat   p $1 }
   | PartialType                        {% posInject \p -> DTType     p $1 }
+  | NetType Strength                   {% posInject \p -> DTNet      p $1 $2 }
   | "." Identifier                     {% posInject \p -> DTDot      p $2 }
   | PortBindings                       {% posInject \p -> DTInstance p $1 }
   | Signing                            {% posInject \p -> DTSigning  p $1 }
   | "automatic"                        {% posInject \p -> DTLifetime p Automatic }
-  | "const" PartialType                {% posInject \p -> DTType     p $2 }
-  | "const" PartialTypeAlias           {% posInject \p -> DTType     p $2 }
   | "{" StreamOp StreamSize Concat "}" {% posInject \p -> DTStream   p $2 $3           (map toLHS $4) }
   | "{" StreamOp            Concat "}" {% posInject \p -> DTStream   p $2 (RawNum 1) (map toLHS $3) }
-  | opt("var") "type" "(" Expr ")"     {% posInject \p -> DTType     p (\Unspecified -> \[] -> TypeOf $4) }
+  | "type" "(" Expr ")"                {% posInject \p -> DTType     p (\Unspecified -> \[] -> TypeOf $3) }
   | IncOrDecOperator                   {% posInject \p -> DTAsgn     p (AsgnOp $1) Nothing (RawNum 1) }
   | "<=" opt(DelayOrEvent) Expr %prec Asgn {% posInject \p -> DTAsgn p AsgnOpNonBlocking $2 $3 }
   | Identifier               "::" Identifier {% posInject \p -> DTPSIdent p $1    $3 }
@@ -711,7 +709,7 @@ NonGenerateModuleItem :: { [ModuleItem] }
 AssignOption :: { AssignOption }
   : {- empty -}   { AssignOptionNone }
   | DelayControl  { AssignOptionDelay $1 }
-  | DriveStrength { AssignOptionDrive $1 }
+  | DriveStrength { uncurry AssignOptionDrive $1 }
 
 -- for ModuleItem, for now
 AssertionItem :: { AssertionItem }
@@ -816,13 +814,13 @@ NOutputGateKW :: { NOutputGateKW }
   : "buf"  { GateBuf  }
   | "not"  { GateNot  }
 
-DriveStrength :: { DriveStrength }
-  : "(" Strength0 "," Strength1 ")" { DriveStrength $2     $4     }
-  | "(" Strength1 "," Strength0 ")" { DriveStrength $4     $2     }
-  | "(" Strength0 "," "highz1"  ")" { DriveStrength $2     Highz1 }
-  | "(" Strength1 "," "highz0"  ")" { DriveStrength Highz0 $2     }
-  | "(" "highz0"  "," Strength1 ")" { DriveStrength Highz0 $4     }
-  | "(" "highz1"  "," Strength0 ")" { DriveStrength $4     Highz1 }
+DriveStrength :: { (Strength0, Strength1) }
+  : "(" Strength0 "," Strength1 ")" { ($2    , $4    ) }
+  | "(" Strength1 "," Strength0 ")" { ($4    , $2    ) }
+  | "(" Strength0 "," "highz1"  ")" { ($2    , Highz1) }
+  | "(" Strength1 "," "highz0"  ")" { (Highz0, $2    ) }
+  | "(" "highz0"  "," Strength1 ")" { (Highz0, $4    ) }
+  | "(" "highz1"  "," Strength0 ")" { ($4    , Highz1) }
 Strength0 :: { Strength0 }
   : "supply0" { Supply0 }
   | "strong0" { Strong0 }
diff --git a/src/Language/SystemVerilog/Parser/ParseDecl.hs b/src/Language/SystemVerilog/Parser/ParseDecl.hs
index 30032b8..c3dfd68 100644
--- a/src/Language/SystemVerilog/Parser/ParseDecl.hs
+++ b/src/Language/SystemVerilog/Parser/ParseDecl.hs
@@ -54,6 +54,8 @@ import Language.SystemVerilog.Parser.Tokens (Position(..))
 data DeclToken
     = DTComma    Position
     | DTAutoDim  Position
+    | DTConst    Position
+    | DTVar      Position
     | DTAsgn     Position AsgnOp (Maybe Timing) Expr
     | DTRange    Position (PartSelectMode, Range)
     | DTIdent    Position Identifier
@@ -61,6 +63,7 @@ data DeclToken
     | DTCSIdent  Position Identifier [ParamBinding] Identifier
     | DTDir      Position Direction
     | DTType     Position (Signing -> [Range] -> Type)
+    | DTNet      Position NetType Strength
     | DTParams   Position [ParamBinding]
     | DTInstance Position [PortBinding]
     | DTBit      Position Expr
@@ -130,6 +133,11 @@ parseDTsAsPortDecls' pieces =
             where
                 decl = Variable dir t x a e
                 dir = if currDir == Local then lastDir else currDir
+        propagateDirections lastDir (Net currDir n s t x a e : decls) =
+            decl : propagateDirections dir decls
+            where
+                decl = Net dir n s t x a e
+                dir = if currDir == Local then lastDir else currDir
         propagateDirections dir (decl : decls) =
             decl : propagateDirections dir decls
         propagateDirections _ [] = []
@@ -138,6 +146,7 @@ parseDTsAsPortDecls' pieces =
         portNames = filter (not . null) . map portName
         portName :: Decl -> Identifier
         portName (Variable _ _ ident _ _) = ident
+        portName (Net  _ _ _ _ ident _ _) = ident
         portName CommentDecl{} = ""
         portName decl =
             error $ "unexpected non-variable port declaration: " ++ (show decl)
@@ -271,11 +280,12 @@ parseDTsAsDeclOrStmt tokens =
         lhs = case takeLHS lhsToks of
             Nothing -> error $ "could not parse as LHS: " ++ show lhsToks
             Just l -> l
-        hasLeadingDecl = tokens /= l4 && tripLookahead l4
+        hasLeadingDecl = tokens /= l5 && tripLookahead l5
         (_, l1) = takeDir      tokens
         (_, l2) = takeLifetime l1
-        (_, l3) = takeType     l2
-        (_, l4) = takeRanges   l3
+        (_, l3) = takeVarOrNet l2
+        (_, l4) = takeType     l3
+        (_, l5) = takeRanges   l4
 
 traceStmt :: Position -> Stmt
 traceStmt pos = CommentStmt $ "Trace: " ++ show pos
@@ -366,12 +376,13 @@ takeLHSStep _ _ = Nothing
 
 
 -- batches together separate declaration lists
+type DeclBase = Direction -> Identifier -> [Range] -> Expr -> Decl
 type Triplet = (Identifier, [Range], Expr)
-type Component = (Direction, Type, [Triplet])
+type Component = (Direction, DeclBase, [Triplet])
 finalize :: (Position, Component) -> [Decl]
-finalize (pos, (dir, typ, trips)) =
+finalize (pos, (dir, base, trips)) =
     CommentDecl ("Trace: " ++ show pos) :
-    map (\(x, a, e) -> Variable dir typ x a e) trips
+    map (\(x, a, e) -> base dir x a e) trips
 
 
 -- internal; entrypoint of the critical portion of our parser
@@ -387,18 +398,19 @@ parseDTsAsComponent [] = error "parseDTsAsComponent unexpected end of tokens"
 parseDTsAsComponent l0 =
     if l /= Nothing && l /= Just Automatic then
         error $ "unexpected non-automatic lifetime: " ++ show l0
-    else if dir == Local && tf rs == Implicit Unspecified [] then
+    else if dir == Local && length l2 == length l5 then
         error $ "declaration(s) missing type information: "
             ++ show (position, tps)
     else
-        (position, component, l5)
+        (position, component, l6)
     where
         (dir, l1) = takeDir      l0
         (l  , l2) = takeLifetime l1
-        (tf , l3) = takeType     l2
-        (rs , l4) = takeRanges   l3
-        (tps, l5) = takeTrips    l4 True
-        component = (dir, tf rs, tps)
+        (von, l3) = takeVarOrNet l2
+        (tf , l4) = takeType     l3
+        (rs , l5) = takeRanges   l4
+        (tps, l6) = takeTrips    l5 True
+        component = (dir, von $ tf rs, tps)
         position = tokPos $ head l0
 
 takeTrips :: [DeclToken] -> Bool -> ([Triplet], [DeclToken])
@@ -449,6 +461,13 @@ takeLifetime :: [DeclToken] -> (Maybe Lifetime, [DeclToken])
 takeLifetime (DTLifetime _ l : rest) = (Just  l, rest)
 takeLifetime                   rest  = (Nothing, rest)
 
+takeVarOrNet :: [DeclToken] -> (Type -> DeclBase, [DeclToken])
+takeVarOrNet (DTConst _ : DTConst pos : _) =
+    error $ "unexpected const after const at " ++ show pos
+takeVarOrNet (DTConst _ : tokens) = takeVarOrNet tokens
+takeVarOrNet (DTNet _ n s : tokens) = (\t d -> Net d n s t, tokens)
+takeVarOrNet tokens = (flip Variable, tokens)
+
 takeType :: [DeclToken] -> ([Range] -> Type, [DeclToken])
 takeType (DTIdent _ a  : DTDot _ b      : rest) = (InterfaceT a  b      , rest)
 takeType (DTType  _ tf : DTSigning _ sg : rest) = (tf       sg          , rest)
@@ -469,6 +488,13 @@ takeType (DTIdent pos tn                : rest) =
                 (_, Nothing) -> True
                 -- if comma is first, then this ident is a declaration
                 (Just a, Just b) -> a < b
+takeType (DTVar _ : DTVar pos : _) =
+    error $ "unexpected var after var at " ++ show pos
+takeType (DTVar _ : rest) =
+    case tf [] of
+        Implicit sg [] -> (IntegerVector TLogic sg, rest')
+        _ -> (tf, rest')
+    where (tf, rest') = takeType rest
 takeType rest = (Implicit Unspecified, rest)
 
 takeRanges :: [DeclToken] -> ([Range], [DeclToken])
@@ -526,6 +552,8 @@ isComma _ = False
 tokPos :: DeclToken -> Position
 tokPos (DTComma    p) = p
 tokPos (DTAutoDim  p) = p
+tokPos (DTConst    p) = p
+tokPos (DTVar      p) = p
 tokPos (DTAsgn     p _ _ _) = p
 tokPos (DTRange    p _) = p
 tokPos (DTIdent    p _) = p
@@ -533,6 +561,7 @@ tokPos (DTPSIdent  p _ _) = p
 tokPos (DTCSIdent  p _ _ _) = p
 tokPos (DTDir      p _) = p
 tokPos (DTType     p _) = p
+tokPos (DTNet      p _ _) = p
 tokPos (DTParams   p _) = p
 tokPos (DTInstance p _) = p
 tokPos (DTBit      p _) = p
diff --git a/test/core/net_or_var.sv b/test/core/net_or_var.sv
new file mode 100644
index 0000000..d930793
--- /dev/null
+++ b/test/core/net_or_var.sv
@@ -0,0 +1,22 @@
+`include "net_or_var.vh"
+module top;
+    typedef struct packed {
+        logic [3:0] a;
+        logic [2:0] b;
+    } t;
+
+    `TEST_ALL(logic, logic)
+    `TEST_ALL(wire, wire)
+    `TEST_ALL(wire logic, wire_logic)
+    `TEST_ALL(wand, wand)
+    `TEST_ALL(wand logic, wand_logic)
+    `TEST_ALL(var, var)
+    `TEST_ALL(var logic, var_logic)
+    `TEST_ALL(reg, reg)
+    `TEST_ALL(var reg, var_reg)
+
+    `TEST_BASE(t, t)
+    `TEST_BASE(wire t, wire_t)
+    `TEST_BASE(wand t, wand_t)
+    `TEST_BASE(var t, var_t)
+endmodule
diff --git a/test/core/net_or_var.v b/test/core/net_or_var.v
new file mode 100644
index 0000000..e31082a
--- /dev/null
+++ b/test/core/net_or_var.v
@@ -0,0 +1,17 @@
+`include "net_or_var.vh"
+module top;
+    `TEST_ALL(reg, logic)
+    `TEST_ALL(wire, wire)
+    `TEST_ALL(wire logic, wire_logic)
+    `TEST_ALL(wand, wand)
+    `TEST_ALL(wand logic, wand_logic)
+    `TEST_ALL(reg, var)
+    `TEST_ALL(reg, var_logic)
+    `TEST_ALL(reg, reg)
+    `TEST_ALL(reg, var_reg)
+
+    `TEST_BASE(reg [6:0], t)
+    `TEST_BASE(wire [6:0], wire_t)
+    `TEST_BASE(wand [6:0], wand_t)
+    `TEST_BASE(reg [6:0], var_t)
+endmodule
diff --git a/test/core/net_or_var.vh b/test/core/net_or_var.vh
new file mode 100644
index 0000000..db4750d
--- /dev/null
+++ b/test/core/net_or_var.vh
@@ -0,0 +1,10 @@
+`define TEST_BASE(keywords, identifier) \
+    keywords a_``identifier = 1'sb1; \
+    keywords [1:0] a_ranged_``identifier = 1'sb1;
+
+`define TEST_ALL(keywords, identifier) \
+    `TEST_BASE(keywords, identifier) \
+    keywords signed a_signed_``identifier = 1'sb1; \
+    keywords unsigned a_unsigned_``identifier = 1'sb1; \
+    keywords signed [1:0] a_signed_ranged_``identifier = 1'sb1; \
+    keywords unsigned [1:0] a_unsigned_ranged_``identifier = 1'sb1;
diff --git a/test/core/port_typename.sv b/test/core/port_typename.sv
index e26087c..39cddf9 100644
--- a/test/core/port_typename.sv
+++ b/test/core/port_typename.sv
@@ -1,7 +1,7 @@
-typedef wire b_t;
+typedef logic b_t;
 module top(
     input a [1:0],
     input b_t b
 );
-    initial $display("%d %d %1d %1d", a, b, $bits(a), $bits(b));
+    initial $display("%b %b %b %1d %1d", a[0], a[1], b, $bits(a), $bits(b));
 endmodule
diff --git a/test/core/port_typename.v b/test/core/port_typename.v
index 3cccc29..6befa80 100644
--- a/test/core/port_typename.v
+++ b/test/core/port_typename.v
@@ -1,6 +1,6 @@
 module top(
-    input [1:0] a,
+    input wire [1:0] a,
     input wire b
 );
-    initial $display("%d %d %1d %1d", a, b, $bits(a), $bits(b));
+    initial $display("%b %b %b %1d %1d", a[0], a[1], b, $bits(a), $bits(b));
 endmodule