language support for parameter type bindings

src/Convert/Struct.hs

@@ -445,6 +445,7 @@ convertAsgn structs types (lhs, expr) =
             where
                 items' = map mapItem items
                 mapItem (mx, e) = (mx, snd $ convertSubExpr e)
+        convertSubExpr Nil = (Implicit Unspecified [], Nil)
 
         -- lookup the range of a field in its unstructured type
         lookupUnstructRange :: TypeFunc -> Identifier -> Range

src/Convert/Traverse.hs

@@ -464,6 +464,7 @@ traverseNestedExprsM mapper = exprMapper
             let names = map fst l
             exprs <- mapM exprMapper $ map snd l
             return $ Pattern $ zip names exprs
+        em (Nil) = return Nil
 
 exprMapperHelpers :: Monad m => MapperM m Expr ->
     (MapperM m Range, MapperM m (Maybe Expr), MapperM m Decl, MapperM m LHS, MapperM m Type)
@@ -524,6 +525,11 @@ traverseExprsM' strat exprMapper = moduleItemMapper
     portBindingMapper (p, me) =
         maybeExprMapper me >>= \me' -> return (p, me')
 
+    paramBindingMapper (p, Left t) =
+        typeMapper t >>= \t' -> return (p, Left t')
+    paramBindingMapper (p, Right e) =
+        exprMapper e >>= \e' -> return (p, Right e')
+
     moduleItemMapper (MIAttr attr mi) =
         -- note: we exclude expressions in attributes from conversion
         return $ MIAttr attr mi
@@ -567,7 +573,7 @@ traverseExprsM' strat exprMapper = moduleItemMapper
                 else return stmts
         return $ MIPackageItem $ Task lifetime f decls' stmts'
     moduleItemMapper (Instance m p x r l) = do
-        p' <- mapM portBindingMapper p
+        p' <- mapM paramBindingMapper p
         l' <- mapM portBindingMapper l
         r' <- mapM rangeMapper r
         return $ Instance m p' x r' l'

src/Language/SystemVerilog/AST/Expr.hs

@@ -8,6 +8,7 @@
 module Language.SystemVerilog.AST.Expr
     ( Expr (..)
     , Range
+    , TypeOrExpr
     , Args (..)
     , PartSelectMode (..)
     , showAssignment
@@ -30,6 +31,8 @@ import {-# SOURCE #-} Language.SystemVerilog.AST.Type
 
 type Range = (Expr, Expr)
 
+type TypeOrExpr = Either Type Expr
+
 data Expr
     = String  String
     | Number  String
@@ -44,13 +47,15 @@ data Expr
     | UniOp   UniOp Expr
     | BinOp   BinOp Expr Expr
     | Mux     Expr Expr Expr
-    | Cast    (Either Type Expr) Expr
-    | Bits    (Either Type Expr)
+    | Cast    TypeOrExpr Expr
+    | Bits    TypeOrExpr
     | Dot     Expr Identifier
     | Pattern [(Maybe Identifier, Expr)]
+    | Nil
     deriving (Eq, Ord)
 
 instance Show Expr where
+    show (Nil          ) = ""
     show (Number  str  ) = str
     show (Ident   str  ) = str
     show (PSIdent x y  ) = printf "%s::%s" x y

src/Language/SystemVerilog/AST/ModuleItem.hs

@@ -8,6 +8,7 @@
 module Language.SystemVerilog.AST.ModuleItem
     ( ModuleItem    (..)
     , PortBinding
+    , ParamBinding
     , ModportDecl
     , AlwaysKW      (..)
     , NInputGateKW  (..)
@@ -16,6 +17,7 @@ module Language.SystemVerilog.AST.ModuleItem
 
 import Data.List (intercalate)
 import Data.Maybe (maybe, fromJust, isJust)
+import Data.Either (either)
 import Text.Printf (printf)
 
 import Language.SystemVerilog.AST.ShowHelp
@@ -23,7 +25,7 @@ import Language.SystemVerilog.AST.ShowHelp
 import Language.SystemVerilog.AST.Attr (Attr)
 import Language.SystemVerilog.AST.Decl (Direction)
 import Language.SystemVerilog.AST.Description (PackageItem)
-import Language.SystemVerilog.AST.Expr (Expr(Ident), Range, showRanges)
+import Language.SystemVerilog.AST.Expr (Expr(Ident, Nil), Range, TypeOrExpr, showRanges)
 import Language.SystemVerilog.AST.GenItem (GenItem)
 import Language.SystemVerilog.AST.LHS (LHS)
 import Language.SystemVerilog.AST.Stmt (Stmt, AssertionItem)
@@ -34,7 +36,7 @@ data ModuleItem
     | AlwaysC    AlwaysKW Stmt
     | Assign     (Maybe Expr) LHS Expr
     | Defparam   LHS Expr
-    | Instance   Identifier [PortBinding] Identifier (Maybe Range) [PortBinding]
+    | Instance   Identifier [ParamBinding] Identifier (Maybe Range) [PortBinding]
     | Genvar     Identifier
     | Generate   [GenItem]
     | Modport    Identifier [ModportDecl]
@@ -66,7 +68,7 @@ instance Show ModuleItem where
     show (Instance   m params i r ports) =
         if null params
             then printf "%s %s%s%s;"     m                     i rStr (showPorts ports)
-            else printf "%s #%s %s%s%s;" m (showPorts params) i rStr (showPorts ports)
+            else printf "%s #%s %s%s%s;" m (showParams params) i rStr (showPorts ports)
         where rStr = maybe "" (\a -> showRanges [a] ++ " ") r
 
 showPorts :: [PortBinding] -> String
@@ -79,6 +81,15 @@ showPort (i, arg) =
         then show (fromJust arg)
         else printf ".%s(%s)" i (if isJust arg then show $ fromJust arg else "")
 
+showParams :: [ParamBinding] -> String
+showParams params = indentedParenList $ map showParam params
+
+showParam :: ParamBinding -> String
+showParam ("*", Right Nil) = ".*"
+showParam (i, arg) =
+    printf fmt i (either show show arg)
+    where fmt = if i == "" then "%s%s" else ".%s(%s)"
+
 showModportDecl :: ModportDecl -> String
 showModportDecl (dir, ident, me) =
     if me == Just (Ident ident)
@@ -87,6 +98,8 @@ showModportDecl (dir, ident, me) =
 
 type PortBinding = (Identifier, Maybe Expr)
 
+type ParamBinding = (Identifier, TypeOrExpr)
+
 type ModportDecl = (Direction, Identifier, Maybe Expr)
 
 data AlwaysKW

src/Language/SystemVerilog/AST/Type.hs

@@ -95,7 +95,8 @@ nullRange :: Type -> ([Range] -> Type)
 nullRange t [] = t
 nullRange t [(Number "0", Number "0")] = t
 nullRange t other =
-    error $ "non vector type " ++ show t ++ " cannot have a range"
+    error $ "non vector type " ++ show t ++
+        " cannot have a range: " ++ show other
 
 data Signing
     = Unspecified

src/Language/SystemVerilog/Parser/Parse.y

@@ -556,7 +556,7 @@ DeclTokens(delim) :: { [DeclToken] }
 DeclToken :: { DeclToken }
   : DeclOrStmtToken   { $1 }
   | ParameterBindings { DTParams   $1 }
-  | ModuleInstantiation { DTInstance $1 }
+  | PortBindings      { DTInstance $1 }
 
 DeclOrStmtTokens(delim) :: { [DeclToken] }
   : DeclOrStmtToken                  delim  { [$1] }
@@ -766,9 +766,6 @@ Lifetime :: { Lifetime }
   : "static"    { Static    }
   | "automatic" { Automatic }
 
-ModuleInstantiation :: { [PortBinding] }
-  : "(" Bindings ")" { $2 }
-
 TFItems :: { [Decl] }
   : "(" DeclTokens(")") ";" { parseDTsAsDecls $2 }
   | "("            ")"  ";" { [] }
@@ -819,6 +816,28 @@ LHSs :: { [LHS] }
   : LHS           { [$1] }
   | LHSs "," LHS  { $1 ++ [$3] }
 
+PortBindings :: { [PortBinding] }
+  : "("                    ")" { [] }
+  | "(" PortBindingsInside ")" { $2 }
+PortBindingsInside :: { [PortBinding] }
+  : PortBinding                        { [$1] }
+  | PortBinding "," PortBindingsInside { $1 : $3}
+PortBinding :: { PortBinding }
+  : "." Identifier "(" opt(Expr) ")" { ($2, $4) }
+  | "." Identifier                   { ($2, Just $ Ident $2) }
+  | Expr                             { ("", Just $1) }
+  | ".*"                             { ("*", Nothing) }
+
+ParameterBindings :: { [ParamBinding] }
+  : "#" "(" ParamBindingsInside ")" { $3 }
+ParamBindingsInside :: { [ParamBinding] }
+  : ParamBinding                         { [$1] }
+  | ParamBinding "," ParamBindingsInside { $1 : $3}
+ParamBinding :: { ParamBinding }
+  : "." Identifier "(" TypeOrExpr ")" { ($2, $4) }
+  | "." Identifier "("            ")" { ($2, Right Nil) }
+  | TypeOrExpr                        { ("", $1) }
+
 Bindings :: { [(Identifier, Maybe Expr)] }
   : {- empty -}      { [] }
   | BindingsNonEmpty { $1 }
@@ -831,9 +850,6 @@ Binding :: { (Identifier, Maybe Expr) }
   | Expr                             { ("", Just $1) }
   | ".*"                             { ("*", Nothing) }
 
-ParameterBindings :: { [(Identifier, Maybe Expr)] }
-  : "#" "(" BindingsNonEmpty ")" { $3 }
-
 Stmts :: { [Stmt] }
   : {- empty -} { [] }
   | Stmts Stmt  { $1 ++ [$2] }
@@ -987,16 +1003,17 @@ Exprs :: { [Expr] }
   :           Expr  { [$1] }
   | Exprs "," Expr  { $1 ++ [$3] }
 
-BitsArg :: { Either Type Expr }
+TypeOrExpr :: { TypeOrExpr }
   : TypeNonIdent { Left $1 }
   | Expr         { Right $1 }
+
 Expr :: { Expr }
   : "(" Expr ")"                { $2 }
   | String                      { String $1 }
   | Number                      { Number $1 }
   |                 Identifier "(" CallArgs ")" { Call (Nothing) $1 $3 }
   | Identifier "::" Identifier "(" CallArgs ")" { Call (Just $1) $3 $5 }
-  | "$bits"    "(" BitsArg  ")" { Bits $3 }
+  | "$bits" "(" TypeOrExpr  ")" { Bits $3 }
   | Identifier                  { Ident $1 }
   | Identifier "::" Identifier  { PSIdent $1 $3 }
   | Expr PartSelect             { Range $1 (fst $2) (snd $2) }

src/Language/SystemVerilog/Parser/ParseDecl.hs

@@ -53,7 +53,7 @@ data DeclToken
     | DTPSIdent  Identifier Identifier
     | DTDir      Direction
     | DTType     (Signing -> [Range] -> Type)
-    | DTParams   [PortBinding]
+    | DTParams   [ParamBinding]
     | DTInstance [PortBinding]
     | DTBit      Expr
     | DTConcat   [LHS]