Internals: Use and enforce class final for ~5% performance boost.

src/V3PreProc.cpp

@@ -43,7 +43,7 @@
 
 //*************************************************************************
 
-class VDefine {
+class VDefine final {
     // Define class.  One for each define.
     // string    m_name;         // Name of the define (list is keyed by this)
     FileLine* m_fileline;  // Where it was declared
@@ -64,7 +64,7 @@ public:
 
 //*************************************************************************
 
-class VDefineRef {
+class VDefineRef final {
     // One for each pending define substitution
     string m_name;  // Define last name being defined
     string m_params;  // Define parameter list for next expansion
@@ -89,7 +89,7 @@ public:
 //*************************************************************************
 /// Data for parsing on/off
 
-class VPreIfEntry {
+class VPreIfEntry final {
     // One for each pending ifdef/ifndef
     bool m_on;  // Current parse for this ifdef level is "on"
     bool m_everOn;  // Some if term in elsif tree has been on
@@ -105,7 +105,7 @@ public:
 //*************************************************************************
 // Data for a preprocessor instantiation.
 
-class V3PreProcImp : public V3PreProc {
+class V3PreProcImp final : public V3PreProc {
 public:
     // TYPES
     typedef std::map<const string, VDefine> DefinesMap;