[CommandLine] Add template instantiations of cl::parser for long and long long.

[rriddle]

Summary

This allows for cl::opt<int64_t> on LP64 platforms.

[rriddle]

Could someone please commit this for me? I really appreciate it.

[RVP]

llvm/include/llvm/Support/CommandLine.h

997

Why is this declared as final. None of the other parsers are final. The CommandLine documentation for writing custom parsers shows that users may extend parser<unsigned>. So why can't they extend parser<long>?

llvm/include/llvm/Support/CommandLine.h

public:
 
   // An out-of-line virtual method to provide a 'home' for this class.
   void anchor() override;
 };
 
 extern template class basic_parser<int>;
 
 //--------------------------------------------------
+// parser<long>
+//
+template <> class parser<long> final : public basic_parser<long> {
+public:
+  parser(Option &O) : basic_parser(O) {}
+
+  // parse - Return true on error.
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, long &Val);
+
+  // getValueName - Overload in subclass to provide a better default value.
+  StringRef getValueName() const override { return "long"; }
+
+  void printOptionDiff(const Option &O, long V, OptVal Default,
+                       size_t GlobalWidth) const;
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  void anchor() override;
+};
+
+extern template class basic_parser<long>;
+
+//--------------------------------------------------
+// parser<long long>
+//
+template <> class parser<long long> : public basic_parser<long long> {
+public:
+  parser(Option &O) : basic_parser(O) {}
+
+  // parse - Return true on error.
+  bool parse(Option &O, StringRef ArgName, StringRef Arg, long long &Val);
+
+  // getValueName - Overload in subclass to provide a better default value.
+  StringRef getValueName() const override { return "long"; }
+
+  void printOptionDiff(const Option &O, long long V, OptVal Default,
+                       size_t GlobalWidth) const;
+
+  // An out-of-line virtual method to provide a 'home' for this class.
+  void anchor() override;
+};
+
+extern template class basic_parser<long long>;
+
+//--------------------------------------------------
 // parser<unsigned>
 //
 template <> class parser<unsigned> : public basic_parser<unsigned> {
 public:
   parser(Option &O) : basic_parser(O) {}
 
   // parse - Return true on error.
   bool parse(Option &O, StringRef ArgName, StringRef Arg, unsigned &Val);

llvm/lib/Support/CommandLine.cpp

 //===----------------------------------------------------------------------===//
 // Template instantiations and anchors.
 //
 namespace llvm {
 namespace cl {
 template class basic_parser<bool>;
 template class basic_parser<boolOrDefault>;
 template class basic_parser<int>;
+template class basic_parser<long>;
+template class basic_parser<long long>;
 template class basic_parser<unsigned>;
 template class basic_parser<unsigned long>;
 template class basic_parser<unsigned long long>;
 template class basic_parser<double>;
 template class basic_parser<float>;
 template class basic_parser<std::string>;
 template class basic_parser<char>;
 

 void GenericOptionValue::anchor() {}
 void OptionValue<boolOrDefault>::anchor() {}
 void OptionValue<std::string>::anchor() {}
 void Option::anchor() {}
 void basic_parser_impl::anchor() {}
 void parser<bool>::anchor() {}
 void parser<boolOrDefault>::anchor() {}
 void parser<int>::anchor() {}
+void parser<long>::anchor() {}
+void parser<long long>::anchor() {}
 void parser<unsigned>::anchor() {}
 void parser<unsigned long>::anchor() {}
 void parser<unsigned long long>::anchor() {}
 void parser<double>::anchor() {}
 void parser<float>::anchor() {}
 void parser<std::string>::anchor() {}
 void parser<char>::anchor() {}
 

 //
 bool parser<int>::parse(Option &O, StringRef ArgName, StringRef Arg,
                         int &Value) {
   if (Arg.getAsInteger(0, Value))
     return O.error("'" + Arg + "' value invalid for integer argument!");
   return false;
 }
 
+// parser<long> implementation
+//
+bool parser<long>::parse(Option &O, StringRef ArgName, StringRef Arg,
+                         long &Value) {
+  if (Arg.getAsInteger(0, Value))
+    return O.error("'" + Arg + "' value invalid for long argument!");
+  return false;
+}
+
+// parser<long long> implementation
+//
+bool parser<long long>::parse(Option &O, StringRef ArgName, StringRef Arg,
+                              long long &Value) {
+  if (Arg.getAsInteger(0, Value))
+    return O.error("'" + Arg + "' value invalid for llong argument!");
+  return false;
+}
+
 // parser<unsigned> implementation
 //
 bool parser<unsigned>::parse(Option &O, StringRef ArgName, StringRef Arg,
                              unsigned &Value) {
 
   if (Arg.getAsInteger(0, Value))
     return O.error("'" + Arg + "' value invalid for uint argument!");
   return false;
void parser<T>::printOptionDiff(const Option &O, T V, OptionValue<T> D,      \
     else                                                                       \
       outs() << "*no default*";                                                \
     outs() << ")\n";                                                           \
   }
 
 PRINT_OPT_DIFF(bool)
 PRINT_OPT_DIFF(boolOrDefault)
 PRINT_OPT_DIFF(int)
+PRINT_OPT_DIFF(long)
+PRINT_OPT_DIFF(long long)
 PRINT_OPT_DIFF(unsigned)
 PRINT_OPT_DIFF(unsigned long)
 PRINT_OPT_DIFF(unsigned long long)
 PRINT_OPT_DIFF(double)
 PRINT_OPT_DIFF(float)
 PRINT_OPT_DIFF(char)
 
 void parser<std::string>::printOptionDiff(const Option &O, StringRef V,