Internals: Pre-elaboration progress towards class parameters.

src/V3LinkCells.cpp

@@ -123,7 +123,7 @@ private:
     V3GraphVertex* vertex(AstNodeModule* nodep) {
         // Return corresponding vertex for this module
         if (!nodep->user1p()) nodep->user1p(new LinkCellsVertex(&m_graph, nodep));
-        return (nodep->user1u().toGraphVertex());
+        return nodep->user1u().toGraphVertex();
     }
 
     AstNodeModule* findModuleSym(const string& modName) {
@@ -185,6 +185,9 @@ private:
         // Module: Pick up modnames, so we can resolve cells later
         VL_RESTORER(m_modp);
         {
+            // For nested modules/classes, child below parent
+            if (m_modp) new V3GraphEdge{&m_graph, vertex(m_modp), vertex(nodep), 1};
+            //
             m_modp = nodep;
             UINFO(4, "Link Module: " << nodep << endl);
             if (nodep->fileline()->filebasenameNoExt() != nodep->prettyName()
@@ -449,6 +452,18 @@ private:
     }
 
     virtual void visit(AstRefDType* nodep) override {
+        iterateChildren(nodep);
+        for (AstPin* pinp = nodep->paramsp(); pinp; pinp = VN_AS(pinp->nextp(), Pin)) {
+            pinp->param(true);
+            if (pinp->name() == "") pinp->name("__paramNumber" + cvtToStr(pinp->pinNum()));
+        }
+    }
+    virtual void visit(AstClassOrPackageRef* nodep) override {
+        iterateChildren(nodep);
+        // Inside a class, an extends or reference to another class
+        // Note we don't add a V3GraphEdge{vertex(m_modp), vertex(nodep->classOrPackagep()}
+        // We could for an extends, but for another reference we cannot, as
+        // it is legal to have classes both with parameters that link to each other
         for (AstPin* pinp = nodep->paramsp(); pinp; pinp = VN_AS(pinp->nextp(), Pin)) {
             pinp->param(true);
             if (pinp->name() == "") pinp->name("__paramNumber" + cvtToStr(pinp->pinNum()));

src/V3Param.cpp

@@ -641,10 +641,11 @@ class ParamProcessor final {
                 longnamer += "_" + paramSmallName(srcModp, modvarp) + paramValueNumber(exprp);
                 any_overridesr = true;
             } else {
+                V3Const::constifyParamsEdit(pinp->exprp());
                 AstConst* const exprp = VN_CAST(pinp->exprp(), Const);
                 const AstConst* const origp = VN_CAST(modvarp->valuep(), Const);
                 if (!exprp) {
-                    // if (debug()) pinp->dumpTree(cout, "error:");
+                    if (debug()) pinp->dumpTree(cout, "-nodes: ");
                     pinp->v3error("Can't convert defparam value to constant: Param "
                                   << pinp->prettyNameQ() << " of " << nodep->prettyNameQ());
                     pinp->exprp()->replaceWith(new AstConst(

src/verilog.y

@@ -6225,8 +6225,7 @@ class_item<nodep>:			// ==IEEE: class_item
 	|	timeunits_declaration			{ $$ = $1; }
 	//UNSUP	covergroup_declaration			{ $$ = $1; }
 	//			// local_parameter_declaration under parameter_declaration
-	|	parameter_declaration ';'
-			{ $$ = $1; BBUNSUP($2, "Unsupported: class parameters"); }  // 1800-2009
+	|	parameter_declaration ';'		{ $$ = $1; }
 	|	';'					{ $$ = nullptr; }
 	//
 	|	error ';'				{ $$ = nullptr; }

test_regress/t/t_class_param.out

@@ -1,5 +1,30 @@
-%Error-UNSUPPORTED: t/t_class_param.v:18:30: Unsupported: class parameters
-   18 |    localparam P = PMINUS1 + 1;
+%Error-UNSUPPORTED: t/t_class_param.v:32:11: Unsupported: parameterized classes
+                                           : ... In instance t
+   32 |    Cls #(.P(4)) c4;
       |           ^
                     ... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
+%Error-UNSUPPORTED: t/t_class_param.v:34:12: Unsupported: parameterized classes
+                                           : ... In instance t
+   34 |    Wrap #(.PMINUS1(15)) w16;
+      |            ^~~~~~~
+%Error-UNSUPPORTED: t/t_class_param.v:7:23: Unsupported: class parameters
+                                          : ... In instance t
+    7 | class Cls #(parameter P = 12);
+      |                       ^
+%Error-UNSUPPORTED: t/t_class_param.v:17:24: Unsupported: class parameters
+                                           : ... In instance t
+   17 | class Wrap #(parameter PMINUS1 = 3);
+      |                        ^~~~~~~
+%Error-UNSUPPORTED: t/t_class_param.v:18:15: Unsupported: class parameters
+                                           : ... In instance t
+   18 |    localparam P = PMINUS1 + 1;
+      |               ^
+%Error-UNSUPPORTED: t/t_class_param.v:19:9: Unsupported: parameterized classes
+                                          : ... In instance t
+   19 |    Cls#(P) c1;
+      |         ^
+%Error-UNSUPPORTED: t/t_class_param.v:25:14: Unsupported: parameterized classes
+                                           : ... In instance t
+   25 | typedef Cls#(5) Cls5_t;
+      |              ^
 %Error: Exiting due to

test_regress/t/t_class_unsup_bad.out

@@ -5,9 +5,6 @@
 %Error-UNSUPPORTED: t/t_class_unsup_bad.v:8:1: Unsupported: virtual data type
     8 | virtual vi_t vi2;
       | ^~~~~~~
-%Error-UNSUPPORTED: t/t_class_unsup_bad.v:14:26: Unsupported: class parameters
-   14 |    localparam LOCPAR = 10;
-      |                          ^
 %Error: t/t_class_unsup_bad.v:29:24: Syntax error: 'const'/'rand'/'randc' not allowed before function/task declaration
    29 |    const function void func_const; endfunction
       |                        ^~~~~~~~~~