Fix false IMPLICITSTATIC on localparam (#6835)

src/V3LinkParse.cpp

@@ -323,6 +323,7 @@ class LinkParseVisitor final : public VNVisitor {
                                      "loop converted to automatic");
         } else if (nodep->valuep() && nodep->lifetime().isNone() && m_lifetime.isStatic()
                    && !nodep->isIO()
+                   && !nodep->isParam()
                    // In task, or a procedure but not Initial/Final as executed only once
                    && ((m_ftaskp && !m_ftaskp->lifetime().isStaticExplicit())
                        || (m_procedurep && !VN_IS(m_procedurep, Initial)

test_regress/t/t_lint_implicitstatic_bad.out

@@ -5,27 +5,27 @@
       |         ^~~~~~~~~~~~~
                          ... For warning description see https://verilator.org/warn/IMPLICITSTATIC?v=latest
                          ... Use "/* verilator lint_off IMPLICITSTATIC */" and lint_on around source to disable this message.
-%Warning-IMPLICITSTATIC: t/t_lint_implicitstatic_bad.v:19:16: Function/task's lifetime implicitly set to static
+%Warning-IMPLICITSTATIC: t/t_lint_implicitstatic_bad.v:20:16: Function/task's lifetime implicitly set to static
                                                             : ... Suggest use 'function automatic' or 'function static'
-   19 |   function int f_implicit_static();
+   20 |   function int f_implicit_static();
       |                ^~~~~~~~~~~~~~~~~
-                         t/t_lint_implicitstatic_bad.v:20:9: ... Location of implicit static variable
+                         t/t_lint_implicitstatic_bad.v:21:9: ... Location of implicit static variable
                                                            : ... The initializer value will only be set once
-   20 |     int cnt = 0;   
+   21 |     int cnt = 0;   
       |         ^~~
-%Warning-IMPLICITSTATIC: t/t_lint_implicitstatic_bad.v:24:8: Function/task's lifetime implicitly set to static
+%Warning-IMPLICITSTATIC: t/t_lint_implicitstatic_bad.v:25:8: Function/task's lifetime implicitly set to static
                                                            : ... Suggest use 'task automatic' or 'task static'
-   24 |   task f_implicit_static();
+   25 |   task f_implicit_static();
       |        ^~~~~~~~~~~~~~~~~
-                         t/t_lint_implicitstatic_bad.v:25:9: ... Location of implicit static variable
+                         t/t_lint_implicitstatic_bad.v:26:9: ... Location of implicit static variable
                                                            : ... The initializer value will only be set once
-   25 |     int cnt = 0;   
+   26 |     int cnt = 0;   
       |         ^~~
-%Error: t/t_lint_implicitstatic_bad.v:24:8: Unsupported in C: Task has the same name as function: 'f_implicit_static'
+%Error: t/t_lint_implicitstatic_bad.v:25:8: Unsupported in C: Task has the same name as function: 'f_implicit_static'
-   24 |   task f_implicit_static();
+   25 |   task f_implicit_static();
       |        ^~~~~~~~~~~~~~~~~
-        t/t_lint_implicitstatic_bad.v:19:16: ... Location of original declaration
+        t/t_lint_implicitstatic_bad.v:20:16: ... Location of original declaration
-   19 |   function int f_implicit_static();
+   20 |   function int f_implicit_static();
       |                ^~~~~~~~~~~~~~~~~
         ... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
 %Error: Exiting due to

test_regress/t/t_lint_implicitstatic_bad.v

@@ -14,6 +14,7 @@ module t (
 
   always @(posedge clk) begin
     int implicit_warn = 1;  // <--- Warning: IMPLICITSTATIC
+    localparam int NO_WARN = 2;  // No warning here
   end
 
   function int f_implicit_static();
@@ -26,4 +27,13 @@ module t (
     ++cnt;
   endtask
 
+  function int f_no_implicit_static();
+    localparam int ONE = 1; // No warning here
+    return ONE;
+  endfunction
+
+  task t_no_implicit_static();
+    localparam TWO = 2; // No warning here
+  endtask
+
 endmodule