better support for struct array parameters

This includes support for
- parsing dimensioned alias parameters
- flattening non-var decls with multiple packed dimensions
- converting arrays of structs
- inferring struct types for decls with initializations

src/Convert/PackedArray.hs

@@ -41,19 +41,29 @@ convertDescription =
 
 -- collects and converts multi-dimensional packed-array declarations
 traverseDeclM :: Decl -> State Info Decl
-traverseDeclM (origDecl @ (Variable dir t ident a me)) = do
+traverseDeclM (Variable dir t ident a me) = do
+    t' <- traverseDeclM' t ident
+    return $ Variable dir t' ident a me
+traverseDeclM (Parameter t ident e) = do
+    t' <- traverseDeclM' t ident
+    return $ Parameter t' ident e
+traverseDeclM (Localparam t ident e) = do
+    t' <- traverseDeclM' t ident
+    return $ Localparam t' ident e
+
+traverseDeclM' :: Type -> Identifier -> State Info Type
+traverseDeclM' t ident = do
     Info typeDims <- get
     let (tf, rs) = typeRanges t
     if length rs <= 1
         then do
             put $ Info $ Map.delete ident typeDims
-            return origDecl
+            return t
         else do
             put $ Info $ Map.insert ident rs typeDims
             let r1 : r2 : rest = rs
             let rs' = (combineRanges r1 r2) : rest
-            return $ Variable dir (tf rs') ident a me
-traverseDeclM other = return other
+            return $ tf rs'
 
 -- combines two ranges into one flattened range
 combineRanges :: Range -> Range -> Range

src/Convert/Struct.hs

@@ -33,8 +33,8 @@ convertDescription (description @ (Part _ _ _ _ _ _)) =
     Part extern kw lifetime name ports (items ++ funcs)
     where
         description' @ (Part extern kw lifetime name ports items) =
-            scopedConversion traverseDeclM traverseModuleItemM traverseStmtM
-                tfArgTypes description
+            scopedConversion (traverseDeclM structs) traverseModuleItemM
+                traverseStmtM tfArgTypes description
         -- collect information about this description
         structs = execWriter $ collectModuleItemsM
             (collectTypesM collectStructM) description
@@ -149,15 +149,31 @@ collectTFArgsM (MIPackageItem item) = do
 collectTFArgsM _ = return ()
 
 -- write down the types of declarations
-traverseDeclM :: Decl -> State Types Decl
-traverseDeclM origDecl = do
+traverseDeclM :: Structs -> Decl -> State Types Decl
+traverseDeclM structs origDecl = do
     case origDecl of
-        Variable _ t x a _ -> do
+        Variable d t x a me -> do
             let (tf, rs) = typeRanges t
             modify $ Map.insert x (tf $ a ++ rs)
-        Parameter  t x _   -> modify $ Map.insert x t
-        Localparam t x _   -> modify $ Map.insert x t
-    return origDecl
+            case me of
+                Nothing -> return origDecl
+                Just e -> do
+                    e' <- convertDeclExpr x e
+                    return $ Variable d t x a (Just e')
+        Parameter  t x e   -> do
+            modify $ Map.insert x t
+            e' <- convertDeclExpr x e
+            return $ Parameter t x e'
+        Localparam t x e   -> do
+            modify $ Map.insert x t
+            e' <- convertDeclExpr x e
+            return $ Localparam t x e'
+    where
+        convertDeclExpr :: Identifier -> Expr -> State Types Expr
+        convertDeclExpr x e = do
+            types <- get
+            let (LHSIdent _, e') = convertAsgn structs types (LHSIdent x, e)
+            return e'
 
 -- produces a function which packs the components of a struct literal
 packerFn :: TypeFunc -> ModuleItem
@@ -262,6 +278,8 @@ convertAsgn structs types (lhs, expr) =
         convertExpr (IntegerVector t sg (r:rs)) (Pattern [(Just "default", e)]) =
             Repeat (rangeSize r) [e']
             where e' = convertExpr (IntegerVector t sg rs) e
+        convertExpr (Struct (Packed sg) fields (_:rs)) (Concat exprs) =
+            Concat $ map (convertExpr (Struct (Packed sg) fields rs)) exprs
         convertExpr (Struct (Packed sg) fields (_:rs)) (Bit e _) =
             convertExpr (Struct (Packed sg) fields rs) e
         convertExpr (Struct (Packed sg) fields rs) (Pattern [(Just "default", e)]) =

src/Language/SystemVerilog/Parser/Parse.y

@@ -727,10 +727,10 @@ DeclOrStmt :: { ([Decl], [Stmt]) }
   | ParameterDecl(";")    { ($1, []) }
 
 ParameterDecl(delim) :: { [Decl] }
-  : ParameterDeclKW                            DeclAsgns delim { map (uncurry $ $1 (Implicit Unspecified [])) $2 }
-  | ParameterDeclKW                 ParamType  DeclAsgns delim { map (uncurry $ $1 ($2                     )) $3 }
-  | ParameterDeclKW                 Identifier DeclAsgns delim { map (uncurry $ $1 (Alias (Nothing)   $2 [])) $3 }
-  | ParameterDeclKW Identifier "::" Identifier DeclAsgns delim { map (uncurry $ $1 (Alias (Just $2)   $4 [])) $5 }
+  : ParameterDeclKW                                       DeclAsgns delim { map (uncurry $ $1 (Implicit Unspecified [])) $2 }
+  | ParameterDeclKW                             ParamType DeclAsgns delim { map (uncurry $ $1 ($2                     )) $3 }
+  | ParameterDeclKW                 Identifier Dimensions DeclAsgns delim { map (uncurry $ $1 (Alias (Nothing)   $2 $3)) $4 }
+  | ParameterDeclKW Identifier "::" Identifier Dimensions DeclAsgns delim { map (uncurry $ $1 (Alias (Just $2)   $4 $5)) $6 }
 ParameterDeclKW :: { Type -> Identifier -> Expr -> Decl }
   : "parameter"  { Parameter  }
   | "localparam" { Localparam }

test/basic/struct_array_param.sv

@@ -0,0 +1,17 @@
+typedef struct packed {
+    logic [2:0] a;
+    logic [1:0] b;
+    logic [3:0] c;
+} foo_s;
+
+parameter foo_s [1:0] foo = {
+    '{ a: 2, b: 1, c: 0 },
+    '{ a: 1, b: 0, c: 2 }
+};
+
+module top;
+    initial begin
+        $display(foo[0]);
+        $display(foo[1]);
+    end
+endmodule

test/basic/struct_array_param.v

@@ -0,0 +1,8 @@
+module top;
+  parameter foo_1 = { 3'b010, 2'b01, 4'b0000 };
+  parameter foo_0 = { 3'b001, 2'b00, 4'b0010 };
+    initial begin
+        $display(foo_0);
+        $display(foo_1);
+    end
+endmodule