Fix self references when param class instantiated (#3833)

src/V3Param.cpp

@@ -542,12 +542,27 @@ class ParamProcessor final {
             hash.insert(V3Os::trueRandom(64));
         }
     }
+    void replaceRefsRecurse(AstNode* const nodep, const AstClass* const oldClassp,
+                            AstClass* const newClassp) {
+        if (AstClassRefDType* const classRefp = VN_CAST(nodep, ClassRefDType)) {
+            if (classRefp->classp() == oldClassp) classRefp->classp(newClassp);
+        }
+        if (nodep->op1p()) replaceRefsRecurse(nodep->op1p(), oldClassp, newClassp);
+        if (nodep->op2p()) replaceRefsRecurse(nodep->op2p(), oldClassp, newClassp);
+        if (nodep->op3p()) replaceRefsRecurse(nodep->op3p(), oldClassp, newClassp);
+        if (nodep->op4p()) replaceRefsRecurse(nodep->op4p(), oldClassp, newClassp);
+        if (nodep->nextp()) replaceRefsRecurse(nodep->nextp(), oldClassp, newClassp);
+    }
     void deepCloneModule(AstNodeModule* srcModp, AstNode* cellp, AstPin* paramsp,
                          const string& newname, const IfaceRefRefs& ifaceRefRefs) {
         // Deep clone of new module
         // Note all module internal variables will be re-linked to the new modules by clone
         // However links outside the module (like on the upper cells) will not.
         AstNodeModule* const newmodp = srcModp->cloneTree(false);
+        if (VN_IS(srcModp, Class)) {
+            replaceRefsRecurse(newmodp->stmtsp(), VN_AS(newmodp, Class), VN_AS(srcModp, Class));
+        }
+
         newmodp->name(newname);
         newmodp->user5(false);  // We need to re-recurse this module once changed
         newmodp->recursive(false);

test_regress/t/t_class_param.v

@@ -45,6 +45,15 @@ endclass
 
 typedef Cls#(8) Cls8_t;
 
+class SelfRefClassTypeParam #(type T=logic);
+   typedef SelfRefClassTypeParam #(int) self_int_t;
+   T field;
+endclass
+
+class SelfRefClassIntParam #(int P=1);
+   typedef SelfRefClassIntParam #(10) self_int_t;
+endclass
+
 module t (/*AUTOARG*/);
 
    Cls c12;
@@ -52,12 +61,20 @@ module t (/*AUTOARG*/);
    Cls8_t c8;
    Wrap #(.P(16)) w16;
    Wrap2 #(.P(32)) w32;
+   SelfRefClassTypeParam src_logic;
+   SelfRefClassTypeParam::self_int_t src_int;
+   SelfRefClassIntParam src1;
+   SelfRefClassIntParam::self_int_t src10;
    initial begin
       c12 = new;
       c4 = new;
       c8 = new;
       w16 = new;
       w32 = new;
+      src_int = new;
+      src_logic = new;
+      src1 = new;
+      src10 = new;
       if (Cls#()::PBASE != 12) $stop;
       if (Cls#(4)::PBASE != 4) $stop;
       if (Cls8_t::PBASE != 8) $stop;
@@ -92,6 +109,11 @@ module t (/*AUTOARG*/);
       `checks($sformatf("%p", c12), "'{member:'haaa}");
       `checks($sformatf("%p", c4), "'{member:'ha}");
 
+      if ($bits(src_logic.field) != 1) $stop;
+      if ($bits(src_int.field) != 32) $stop;
+      if (src1.P != 1) $stop;
+      if (src10.P != 10) $stop;
+
       $write("*-* All Finished *-*\n");
       $finish;
    end

test_regress/t/t_class_param_mod.v

@@ -45,17 +45,34 @@ endclass
 
    typedef Cls#(8) Cls8_t;
 
+class SelfRefClassTypeParam #(type T=logic);
+   typedef SelfRefClassTypeParam #(int) self_int_t;
+   T field;
+endclass
+
+class SelfRefClassIntParam #(int P=1);
+   typedef SelfRefClassIntParam #(10) self_int_t;
+endclass
+
    Cls c12;
    Cls #(.PBASE(4)) c4;
    Cls8_t c8;
    Wrap #(.P(16)) w16;
    Wrap2 #(.P(32)) w32;
+   SelfRefClassTypeParam src_logic;
+   SelfRefClassTypeParam::self_int_t src_int;
+   SelfRefClassIntParam src1;
+   SelfRefClassIntParam::self_int_t src10;
    initial begin
       c12 = new;
       c4 = new;
       c8 = new;
       w16 = new;
       w32 = new;
+      src_int = new;
+      src_logic = new;
+      src1 = new;
+      src10 = new;
       if (Cls#()::PBASE != 12) $stop;
       if (Cls#(4)::PBASE != 4) $stop;
       if (Cls8_t::PBASE != 8) $stop;
@@ -90,6 +107,11 @@ endclass
       `checks($sformatf("%p", c12), "'{member:'haaa}");
       `checks($sformatf("%p", c4), "'{member:'ha}");
 
+      if ($bits(src_logic.field) != 1) $stop;
+      if ($bits(src_int.field) != 32) $stop;
+      if (src1.P != 1) $stop;
+      if (src10.P != 10) $stop;
+
       $write("*-* All Finished *-*\n");
       $finish;
    end